WO2016158570A1 - Egr system - Google Patents

Egr system Download PDF

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Publication number
WO2016158570A1
WO2016158570A1 PCT/JP2016/059015 JP2016059015W WO2016158570A1 WO 2016158570 A1 WO2016158570 A1 WO 2016158570A1 JP 2016059015 W JP2016059015 W JP 2016059015W WO 2016158570 A1 WO2016158570 A1 WO 2016158570A1
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WO
WIPO (PCT)
Prior art keywords
purge
exhaust gas
line
egr
gas recirculation
Prior art date
Application number
PCT/JP2016/059015
Other languages
French (fr)
Japanese (ja)
Inventor
中川　貴裕
平岡　直大
和久 伊藤
哲司 上田
Original Assignee
三菱重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to KR1020177027214A priority Critical patent/KR101999909B1/en
Priority to CN201680019557.7A priority patent/CN107429638B/en
Publication of WO2016158570A1 publication Critical patent/WO2016158570A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/36—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for adding fluids other than exhaust gas to the recirculation passage; with reformers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities

Definitions

  • the present invention relates to an EGR system that reduces NOx in exhaust gas by returning a part of the exhaust gas discharged from the combustion chamber of an internal combustion engine to the combustion chamber.
  • An exhaust gas recirculation is one that reduces NOx in the exhaust gas.
  • This EGR branches a part of the exhaust gas discharged from the combustion chamber of the internal combustion engine to the exhaust line to the exhaust gas recirculation line, mixes it in the combustion air to make it a combustion gas, and returns it to the combustion chamber. Therefore, the combustion gas has a reduced oxygen concentration, and the combustion temperature is reduced by delaying the rate of combustion, which is the reaction between the fuel and oxygen, whereby the amount of NOx generation can be reduced.
  • the exhaust gas recirculation line is constituted by piping, and at the time of EGR operation, exhaust gas (exhaust gas recirculation gas) flows. Since this exhaust gas contains corrosive components such as NOx and SOx, the corrosive components adhere and remain on the inner surface of the pipe. When this corrosive component is below the acid dew point, it becomes nitric acid or sulfuric acid, which may cause corrosion of the piping. In addition, there exist some which were described in patent document 1, for example as what prevents deterioration of the NOx removal catalyst by sulfuric acid condensation.
  • the exhaust gas denitration equipment for a reciprocating engine described in Patent Document 1 described above prevents deterioration of the denitration catalyst due to sulfuric acid condensation, and does not correspond to the corrosive component contained in the exhaust gas recirculation gas.
  • the present invention solves the above-mentioned problems, and an object of the present invention is to provide an EGR system that prevents pipe corrosion by removing corrosive components remaining in an exhaust gas recirculation line.
  • the EGR system of the present invention comprises an exhaust gas recirculation line for recirculating a part of exhaust gas discharged from an engine to the engine as a part of combustion gas, and the exhaust gas recirculation line It is characterized by comprising an EGR inlet valve provided, and a purge device for supplying a purge gas to the exhaust gas recirculation line to discharge the remaining corrosive components.
  • the purge device includes a purge gas supply line for supplying a purge gas to the exhaust gas recirculation line, and a purge gas discharge line for discharging a corrosive component remaining with the purge gas.
  • the purge gas is supplied from the purge gas supply line to the exhaust gas recirculation line, the purge gas and the corrosive component are discharged from the purge gas discharge line, and the supply of the purge gas and the discharge of the purge gas and the corrosive component can be properly performed.
  • the exhaust gas recirculation line further includes a scrubber provided downstream of the EGR inlet valve in the exhaust gas recirculation line, and the purge gas supply line is between the EGR inlet valve and the scrubber in the exhaust gas recirculation line.
  • a purge valve may be provided to open and close the purge gas supply line.
  • the purge gas is supplied from the purge gas supply line between the EGR inlet valve and the scrubber in the exhaust gas recirculation line, and the exhaust gas recirculation including the scrubber Corrosive components remaining in the line can be removed, and corrosive components remaining in the exhaust gas recirculation line can be properly removed.
  • the EGR system according to the present invention is characterized in that when the EGR operation stop signal is input, the EGR inlet valve is closed to open the purge valve for a predetermined period.
  • the EGR inlet valve is closed and the purge valve is opened for a predetermined period. Therefore, when the EGR operation is stopped, the purge gas is supplied from the purge gas supply line to the exhaust gas recirculation line. Thus, the corrosive components remaining in the exhaust gas recirculation line can be removed earlier.
  • the purge gas discharge line is provided with a first purge gas discharge line for discharging the purge gas from the purge gas supply line from the exhaust gas recirculation line to the engine.
  • the purge gas from which the harmful substance remaining in the exhaust gas recirculation line has been removed is discharged from the first purge gas exhaust line to the engine, the harmful substance can be processed by the engine and the exhaust gas from the engine can be processed. It can suppress the release to the outside.
  • the purge gas discharge line is provided with a second purge gas discharge line for discharging the purge gas from the purge gas supply line to the exhaust line, and an exhaust valve for opening and closing the second purge gas discharge line. It is characterized by
  • the purge gas supplied from the purge gas supply line to the exhaust gas recirculation line is discharged from the second purge gas discharge line to the exhaust line, and even if the operation of the engine is stopped, The purge gas from which harmful substances remaining in the exhaust gas recirculation line have been removed can be properly processed.
  • the EGR system according to the present invention is characterized in that when the EGR operation is stopped, the exhaust valve is opened for a predetermined period.
  • the exhaust valve is opened for a predetermined period, so the EGR operation is stopped and the purge gas of the exhaust gas recirculation line is exhausted from the purge gas discharge line even if the engine operation is stopped. It can be fed to the line, and the purge gas from which the corrosive components remaining in the exhaust gas recirculation line have been removed can be properly processed.
  • the purge device is characterized in that outside air is supplied to the exhaust gas recirculation line as a purge gas.
  • the purge process can be performed with high accuracy without leaving the harmful substances in the exhaust gas recirculation line.
  • the piping system can be simplified.
  • the purge device is characterized in that a part of scavenging air supplied to the engine is supplied to the exhaust gas recirculation line as a purge gas.
  • the purge device is characterized in that compressed air is supplied as a purge gas to the exhaust gas recirculation line.
  • the exhaust gas recirculation line can be properly purged since the compressed air is supplied to the exhaust gas recirculation line to discharge the remaining harmful substances.
  • a scrubber is provided downstream of the EGR inlet valve in the exhaust gas recirculation line, and the purge gas supply line is connected downstream of the scrubber in the exhaust gas recirculation line, and the purge gas
  • a purge valve for opening and closing a supply line, and a blower for supplying a purge gas from the purge gas supply line in the reverse direction of the exhaust gas recirculation line are provided.
  • the purge valve is opened and the blower is operated in the reverse rotation direction, whereby the purge gas is supplied from the purge gas supply line to the downstream side of the exhaust gas recirculation line downstream of the scrubber. It is possible to remove the harmful substances remaining in the exhaust gas recirculation line including the above, and to properly remove the corrosive components remaining in the exhaust gas recirculation line.
  • the purge gas supply line discharges the purge gas from the purge gas supply line from the exhaust gas recirculation line to an exhaust line.
  • the harmful substance can be treated by the exhaust system of the engine, and emission to the outside can be suppressed.
  • the EGR outlet valve provided downstream of the connection portion of the purge gas supply line in the exhaust gas recirculation line, and the EGR outlet valve closed when the EGR operation is stopped to set the purge valve It is characterized by opening only for a period.
  • the EGR outlet valve is closed and the purge valve is opened for a predetermined period. Therefore, when the EGR operation is stopped, the purge gas is supplied from the purge gas supply line to the exhaust gas recirculation line. It is possible to remove harmful substances remaining in the exhaust gas recirculation line.
  • the purge device for supplying the purge gas to the exhaust gas recirculation line to discharge the remaining harmful substances since the purge device for supplying the purge gas to the exhaust gas recirculation line to discharge the remaining harmful substances is provided, it is possible to prevent the corrosion of the piping that constitutes the exhaust gas recirculation line.
  • FIG. 1 is a schematic configuration view showing an EGR system of the first embodiment.
  • FIG. 2 is a flow chart showing purge control when the EGR operation is stopped in the EGR system of the first embodiment.
  • FIG. 3 is a flow chart showing the operation of the EGR system at the time of entry of the ship of the first embodiment.
  • FIG. 4 is a flow chart showing the operation of the EGR system at the time of departure of the ship of the first embodiment.
  • FIG. 5 is a graph showing the SO 2 concentration of the exhaust gas recirculation line against the purge time.
  • FIG. 6 is a graph showing details of the SO 2 concentration in the exhaust gas recirculation line with respect to the purge time.
  • FIG. 7 is a schematic block diagram showing the EGR system of the second embodiment.
  • FIG. 1 is a schematic configuration view showing an EGR system of the first embodiment.
  • FIG. 2 is a flow chart showing purge control when the EGR operation is stopped in the EGR system of the first embodiment.
  • FIG. 3 is
  • FIG. 8 is a flowchart showing purge control at the time of engine operation stop in the EGR system of the second embodiment.
  • FIG. 9 is a flow chart showing the operation of the EGR system at the time of entry of the ship of the second embodiment.
  • FIG. 10 is a schematic configuration diagram showing an EGR system of the third embodiment.
  • FIG. 11 is a schematic configuration diagram showing an EGR system of a fourth embodiment.
  • FIG. 12 is a flowchart showing purge control at the time of EGR operation stop in the EGR system of the fourth embodiment.
  • FIG. 13 is a schematic configuration diagram showing an EGR system of a fifth embodiment.
  • FIG. 1 is a schematic configuration view showing an EGR system of the first embodiment.
  • the marine diesel engine 10 includes an engine body 11, a supercharger 12, an air cooler 52, and an EGR system 13.
  • the engine body 11 is a propulsion engine (main engine) that drives and rotates a propulsion propeller via a propeller shaft.
  • the engine body 11 is a uniflow scavenging diesel engine, which is a two-stroke diesel engine, in which the flow of intake and exhaust in the cylinder is one direction from the lower side to the upper side, and the residual of the exhaust is eliminated. It is.
  • the engine body 11 has a plurality of cylinders (combustion chambers) 21 in which pistons move up and down, a scavenging air trunk 22 in communication with the cylinders 21, and an exhaust manifold 23 in communication with the cylinders 21.
  • the engine body 11 has the scavenging air trunk 22 connected to the air supply line G1 and the exhaust manifold 23 connected to the exhaust line G2.
  • the turbocharger 12 is configured by connecting a compressor 31 and a turbine 32 so as to rotate integrally with a rotating shaft 33.
  • the turbine 32 is rotated by the exhaust gas discharged from the exhaust line G2 of the engine body 11, the rotation of the turbine 32 is transmitted by the rotation shaft 33, and the compressor 31 is rotated.
  • Gas air and / or recycle gas
  • the compressor 31 is further provided with a suction line G6 for sucking air from the outside, and an exhaust gas recirculation line G7 to which exhaust gas is sent by the EGR blower 50.
  • a suction line G6 for sucking air from the outside
  • an exhaust gas recirculation line G7 to which exhaust gas is sent by the EGR blower 50.
  • the exhaust gas (recirculation gas) from the recirculation line G7 is mixed by a mixer (not shown) to generate a combustion gas.
  • the mixer does not necessarily have to be a device having only the function of mixing the exhaust gas with the air, and a silencer (not shown) attached to the compressor may be provided with the above-described function as a mixer. .
  • the turbine 32 is connected to an exhaust line G3 for discharging the exhaust gas generated by rotating the turbine 32, and the exhaust line G3 is connected to a chimney (funnel) via an exhaust gas processing device (not shown).
  • the air cooler (cooler) 52 cools the combustion gas by exchanging heat between the combustion gas compressed by the compressor 31 and having a high temperature and the cooling water.
  • the EGR system 13 includes exhaust gas recirculation lines G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower (blower) 50, a purge device, and a control device 60.
  • the EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances.
  • the EGR system 13 is provided to bypass from the exhaust line G3 to the air supply line G1.
  • the exhaust gas recirculation line G4 is provided with an EGR inlet valve (opening / closing valve) 41.
  • the EGR inlet valve 41 opens / closes the exhaust gas branched from the exhaust line G3 to the exhaust gas recirculation line G4 by opening and closing the exhaust gas recirculation line G4.
  • the EGR inlet valve 41 may be used as a flow rate adjusting valve to adjust the flow rate of the exhaust gas passing through the exhaust gas recirculation line G4.
  • the scrubber 42 removes harmful substances such as particulates (PM) such as SOx and dust contained therein by injecting water to the exhaust gas.
  • the scrubber 42 includes a hollow throat 43, a venturi 44 into which exhaust gas is introduced, and an enlargement 45 that gradually returns to the original flow velocity.
  • the scrubber 42 includes a water injection unit 46 that injects water to the exhaust gas introduced into the venturi unit 44.
  • the scrubber 42 is connected to an exhaust gas recirculation line G5 for discharging the exhaust gas from which harmful substances have been removed and the waste water.
  • the Venturi type is adopted in the present embodiment, the present invention is not limited to this configuration.
  • the exhaust gas recirculation line (second line) G ⁇ b> 5 has one end connected to the scrubber 42 and the other end connected to the EGR blower (blower) 50.
  • a demister unit 49 is disposed in the path of the exhaust gas recirculation line G5.
  • the demister unit 49 separates the waste gas and the waste gas from which harmful substances have been removed by water injection.
  • the demister unit 49 is provided with a drainage circulation line W1 that circulates the drainage to the water injection unit 46 of the scrubber 42.
  • the drainage circulation line W1 is provided with a hold tank 48 for temporarily storing drainage and a pump 50.
  • the EGR blower 50 guides the exhaust gas in the scrubber 42 from the exhaust gas recirculation line G5 to the demister unit 49, and is driven by an electric motor.
  • the exhaust gas recirculation line (third line) G7 has one end connected to the EGR blower 50 and the other end connected to the compressor 31 via a mixer (not shown). Exhaust gas is sent to the compressor 31 by the EGR blower 50. Further, the exhaust gas recirculation line G7 is provided with an EGR outlet valve (on-off valve or flow control valve) 51.
  • the purge apparatus of the present embodiment includes a purge gas supply line G11 and a purge valve 61.
  • the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1 function as a first purge gas discharge line.
  • the purge device supplies the purge gas from the purge gas supply line G11, and discharges the purge gas together with the corrosive components from the exhaust gas recirculation line G7.
  • the exhaust gas recirculation lines G4, G5, G7 are connected to the engine body 11 via the air supply line G1.
  • One end of the purge gas supply line G11 is open to the atmosphere, and the other end is in communication with the middle of the exhaust gas recirculation line G4. More specifically, the other end of the purge gas supply line G11 is connected to the middle of the exhaust gas recirculation line G4 between the EGR inlet valve 41 and the scrubber 42.
  • a compressed air supply source may be connected to one end of the purge gas supply line G11.
  • the compressed air supply source includes, for example, a compressor and a pressure accumulation tank, and the compressed air generated by the compressor is stored in the pressure accumulation tank, and the compressed air is supplied to various devices used in the ship. Can be supplied.
  • the purge gas can be supplied to the exhaust gas recirculation lines G4, G5, G7 without driving the EGR blower 50.
  • the purge valve 61 can open and close the purge gas supply line G11. Therefore, closing the EGR inlet valve 41 and opening the purge valve 61 sucks outside air (air) as purge gas from one end of the purge gas supply line G11 and supplies it to the exhaust gas recirculation line G4 through the purge gas supply line G11. Can.
  • the control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, and the purge valve 61 in accordance with the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50.
  • the control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, and the purge valve 61 in accordance with the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50. That is, the control device 60 does not receive the EGR operation start signal S1 if the current operation area of the ship is outside the ECA (NOx control area) that regulates the emission of NOx, and the EGR inlet valve 41 and the EGR outlet valve 51, the purge valve 61 is closed and the driving of the EGR blower 50 is stopped. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3.
  • ECA NOx control area
  • the control device 60 receives the EGR operation start signal S1 and the EGR inlet valve 41 and the EGR outlet valve 51 As well as driving the EGR blower 50. Then, a part of the exhaust gas discharged from the engine body 11 is supplied from the exhaust line G3 to the exhaust gas recirculation lines G4, G5, G7.
  • the control device 60 receives the EGR operation stop signal S2 and reduces the rotational speed of the EGR blower 50. Thereafter, the EGR inlet valve 41 is closed and the purge valve 61 is opened. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, the air supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is supplied to the scavenging trunk 22 of the engine body 11 through the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1.
  • the combustion air is supplied from the scavenging air trunk 22 into the cylinder 21 from the scavenging air trunk 22, the combustion air is compressed by the piston, and the fuel is injected to the high-temperature air to cause natural ignition. To burn. Then, the generated combustion gas is discharged from the exhaust manifold 23 to the exhaust line G2 as an exhaust gas. The exhaust gas discharged from the engine body 11 is discharged to the exhaust line G3 after rotating the turbine 32 in the turbocharger 12. When the EGR inlet valve 41 is closed, the entire amount is discharged to the outside from the exhaust line G3. Be done.
  • a scrubber 42 removes harmful substances from the exhaust gas that has flowed into the exhaust gas recirculation line G4. That is, when the exhaust gas passes through the venturi section 44 at high speed, the scrubber 42 injects water from the water injection section 46, thereby cooling the exhaust gas with this water and dropping harmful substances together with the water to remove it.
  • the exhaust gas from which harmful substances have been removed by the scrubber 42 is discharged to the exhaust gas recirculation line G5, and after the exhaust gas and the drainage are separated by the demister unit 49, the turbocharger 12 is connected via the EGR blower 50 and the exhaust gas recirculation line G7. Sent to Then, this exhaust gas is mixed with the air taken in from the suction line G6 to become a combustion gas, compressed by the compressor 31 of the turbocharger 12, and then cooled by the air cooler 52, and from the air supply line G1 to the engine main body 11 Supplied to
  • FIG. 2 is a flow chart showing the purge control at the time of EGR operation stop in the EGR system
  • FIG. 3 is a flow chart showing the operation of the EGR system at the time of entry of the ship
  • FIG. 4 shows the action of the EGR system at the departure of the ship flowchart
  • Fig. 5 is a graph representing the SO 2 concentration in the exhaust gas recirculation line for the purge time
  • FIG. 6 is a graph showing the details of the SO 2 concentration in the exhaust gas recirculation line for purge time.
  • step S11 when the EGR operation stop signal S2 is input in step S11, the control device 60 starts the EGR operation stop sequence, and step S12 Then, the rotational speed of the EGR blower 50 is decreased, and in step S13, it is determined whether the rotational speed of the EGR blower 50 has become equal to or less than a preset rotational speed.
  • the process waits until the rotational speed of the EGR blower 50 becomes equal to or less than the set rotational speed, and when the rotational speed of the EGR blower 50 becomes equal to or less than the set rotational speed, the process proceeds to step S16.
  • step S14 the closing operation of the EGR inlet valve 41 is started, and in step S15, it is determined whether the opening degree of the EGR inlet valve 41 has become equal to or less than a preset opening degree.
  • the process waits until the degree of opening of the EGR inlet valve 41 becomes less than the set degree of opening, and maintains the degree of opening of the EGR inlet valve 41 in a slightly open state when the degree of opening of the EGR inlet valve 41 becomes less than the set degree of opening. Then, the process proceeds to step S16.
  • step S16 the control device 60 starts the opening operation of the purge valve 61, and in step S17, determines whether the opening degree of the purge valve 61 is fully opened.
  • the operation waits until the opening degree of the purge valve 61 is fully opened, and when the opening degree of the purge valve 61 is fully opened, the closing operation of the EGR inlet valve 41 is resumed in step S18, and the EGR inlet in step S19. It is determined whether or not the opening degree of the valve 41 has become equal to or less than a preset opening degree (almost fully closed).
  • the process waits until the opening degree of the EGR inlet valve 41 is fully closed, and when the opening degree of the EGR inlet valve 41 is fully closed, the purge process of the exhaust gas recirculation line G4 is preset in step S20. Run for the specified time.
  • the exhaust gas recirculation lines G4, G5, G7, the compressor 31, and the air supply line G1 communicate with the scavenge air trunk 22 of the engine body 11. Further, since the EGR blower 50 is provided in the middle of the exhaust gas recirculation lines G4, G5, G7, the gas flow to the scavenging trunk 22 side acts by driving the EGR blower 50. Therefore, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are removed by the air, and the purge gas containing the corrosive components is sent to the scavenging trunk 22.
  • the control device 60 determines whether or not a specified time has elapsed since it was determined in step S21 that the degree of opening of the EGR inlet valve 41 is fully closed.
  • the purge process of the exhaust gas recirculation lines G4, G5, G7 is executed until the specified time has elapsed.
  • the purge processing time of the exhaust gas recirculation lines G4, G5, G7 is set in advance.
  • the volume (volume) of the equipment or piping that executes the purge process is Vm 3
  • the amount of air taken into the purge gas supply line G11 per unit time is V p m 3 / min
  • the concentration of corrosive components in the purge region is X 0 ppm
  • the purge time when is T it is possible to determine the average density X t of the purge region after T minutes by the following equation.
  • X t + 1 ⁇ (X t V)-(X t V p ) ⁇ / V
  • FIG. 5 is a partial enlarged view of FIG.
  • FIG. 5 when the purge time is 5 minutes, the concentration of corrosive components in the exhaust gas recirculation lines G4, G5, G7 decreases to the specified value, and as shown in FIG. The concentration of corrosive components in the exhaust gas recirculation lines G4, G5 and G7 is reduced to almost 0 ppm.
  • step S21 when it is determined in step S21 that the opening degree of the EGR inlet valve 41 is fully closed and the specified time has elapsed, the operation of the EGR blower 50 is stopped in step S22. Subsequently, in step S23, the purge valve 61 is closed, and in step S24, the EGR outlet valve 51 is closed. In step S25, the purge process of the exhaust gas recirculation lines G4, G5, G7 is completed.
  • the stage before entering the port for example, the stage of switching the engine operation mode from the out-of-port navigation mode to the in-port navigation mode (Full Ahead: full forward speed at harbor speed)). Stop the EGR operation. After the EGR operation is stopped, the above-described purge control at the time of the EGR operation stop is executed.
  • the EGR system according to the first embodiment stops the EGR operation in the ECA before entering the port. Therefore, only by providing the purge gas supply line G11 and the purge valve 61 as a purge device, The corrosive components can be discharged from the exhaust gas recirculation lines G4, G5, G 7. On the other hand, at the time of leaving the port, the EGR operation is stopped outside the ECA and purging is performed as shown in FIG.
  • the exhaust gas recirculation lines G4, G5, G7 recirculate a part of the exhaust gas discharged from the engine body 11 to the engine body 11 as a part of the combustion gas.
  • an EGR inlet valve 41 provided in the exhaust gas recirculation line G4, and a purge gas supply line G11 as a purge device for supplying the purge gas to the exhaust gas recirculation lines G4, G5, G7 and discharging remaining corrosive components.
  • the purge device supplies the purge gas from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7
  • the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are discharged together with the purge gas. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7 can be suppressed.
  • a purge gas supply line G11 and a purge valve 61 are provided as a purge device.
  • the exhaust gas recirculation lines G4, G5, G7 function as purge gas discharge lines.
  • the purge gas can be supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4, and the corrosive components can be discharged together with the purge gas from the exhaust gas recirculation lines G4, G5, G7. That is, the supply of the purge gas and the discharge of the corrosive component can be properly performed.
  • the purge device supplies outside air (air) as a purge gas from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7. Therefore, since air is supplied to the exhaust gas recirculation lines G4, G5, G7 to discharge the remaining corrosive components, it is possible to purge without leaving any corrosive components in the exhaust gas recirculation lines G4, G5, G7.
  • the exhaust gas recirculation lines G4, G5, and G7 may be connected to the purge gas supply line G11 whose one end is open to the atmosphere, and the piping system of the purge device can be simplified.
  • a purge device there are a purge gas supply line G11 connected between the EGR inlet valve 41 and the scrubber 42 in the exhaust gas recirculation line G4, and a purge valve 61 for opening and closing the purge gas supply line G11. It is provided.
  • the purge gas is supplied from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7 by opening the purge valve 61, and the scrubber 42, the demister unit 49 and Corrosion components remaining in the exhaust gas recirculation lines G4, G5, G7 including the EGR blower 50 can be removed, and corrosion components remaining in the exhaust gas recirculation lines G4, G5, G7 can be properly removed.
  • the purge device supplies the purge gas from the purge gas supply line G11 to the engine body 11 from the exhaust gas recirculation lines G4, G5, G7. Therefore, while being able to process a corrosive component with engine main part 11, by processing exhaust gas from engine main part 11, discharge to the exterior can be controlled.
  • the EGR system according to the first embodiment is provided with a control device 60 that closes the EGR inlet valve 41 and opens the purge valve 61 for a predetermined period when the EGR operation stop signal S2 is input. Therefore, when the EGR operation is stopped, the purge gas is supplied from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7, and corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 at an early stage by the purge gas are It can be removed.
  • the purge valve 61 is opened for a predetermined period, and then the engine operation is stopped. Accordingly, the purge gas is supplied from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7 before the EGR operation is stopped and the operation of the engine main body 11 is stopped. , G5, and G7 can be removed.
  • FIG. 7 is a schematic block diagram showing the EGR system of the second embodiment.
  • the members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
  • the purge apparatus includes a purge gas supply line G11, a purge valve 61, a purge gas discharge line G12, and an exhaust valve 62.
  • the exhaust gas recirculation line G7 functions as a first purge gas discharge line
  • the purge gas discharge line G12 functions as a second purge gas discharge line.
  • the purge device supplies a purge gas from a purge gas supply line G11, and discharges a purge gas and a corrosive component from an exhaust gas recirculation line G7 or a purge gas discharge line G12.
  • One end of the purge gas discharge line G12 is connected to the middle of the exhaust gas recirculation line G7, and the other end is connected to the middle of the exhaust line G3. More specifically, one end of the purge gas discharge line G12 is connected to the middle of the exhaust gas recirculation line G7 between the outlet of the EGR blower 50 and the EGR outlet valve (flow control valve) 51, and the other end is It is connected between the outlet of the turbine 32 and the connection between the exhaust line G3 and the exhaust gas recirculation line G4.
  • the exhaust valve 62 can open and close the purge gas discharge line G12. Therefore, when the EGR outlet valve (flow control valve) 51 is closed and the exhaust valve 62 is opened, the gas flowing inside the EGR system 13 is exhausted to the exhaust line G3 through the purge gas exhaust line G12.
  • the control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, the purge valve 61, and the exhaust valve 62 according to the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50.
  • the control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, the purge valve 61, and the exhaust valve 62 according to the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50. That is, the control device 60 does not receive the EGR operation start signal S1 if the current operation area of the ship is outside the ECA that regulates the emission amount of NOx, and the EGR inlet valve 41, the EGR outlet valve 51, the purge valve 61, The exhaust valve 62 is closed and the driving of the EGR blower 50 is stopped. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3.
  • the control device 60 receives the EGR operation start signal S1 and opens the EGR inlet valve 41 and the EGR outlet valve 51.
  • the EGR blower 50 is driven. Then, a part of the exhaust gas discharged from the engine body 11 is supplied from the exhaust line G3 to the exhaust gas recirculation lines G4, G5, G7.
  • the control device 60 receives the EGR operation stop signal S2 and reduces the rotational speed of the EGR blower 50. Thereafter, the EGR inlet valve 41 is closed and the purge valve 61 is opened. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, the air supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is supplied to the scavenging trunk 22 of the engine body 11 through the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1.
  • the control device 60 receives the engine operation stop signal S3, closes the EGR outlet valve 51, and opens the exhaust valve 62. Then, the air supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is discharged from the exhaust gas recirculation line G4 to the outside through the gas discharge line G5, the exhaust gas supply line G7, the purge gas discharge line G12, and the exhaust line G3. .
  • the EGR system according to the second embodiment can remove the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 even after the operation of the engine body 11 is stopped. It is different from
  • FIG. 8 is a flow chart showing purge control at the time of engine operation stop in the EGR system
  • FIG. 9 is a flow chart showing the operation of the EGR system at the time of entry of a ship.
  • step S31 the control device 60 is executing purge processing of the exhaust gas recirculation lines G4, G5, G7 or before execution of the purge processing.
  • the engine operation stop signal (purge process start signal) S3 is input, the purge sequence is started, and in step S32, the opening operation of the purge valve 61 is started, and in step S33, the opening degree of the purge valve 61 is Determine if it is fully open.
  • the process waits until the opening degree of the purge valve 61 is fully opened, and when the opening degree of the purge valve 61 is fully opened, the process proceeds to step S34.
  • steps S32 and S33 if the purge process of the exhaust gas recirculation lines G4, G5, and G7 is being performed, the opening degree of the purge valve 61 is already fully open, and the process directly proceeds to step S34.
  • step S34 the control device 60 starts the opening operation of the exhaust valve 62, and determines in step S35 whether or not the opening degree of the exhaust valve 62 is fully open.
  • the process waits until the opening degree of the exhaust valve 62 is fully opened, and when the opening degree of the exhaust valve 62 is fully opened, the number of rotations of the EGR blower 50 is reduced to a preset number of rotations in step S36. .
  • step S37 the purge process of the exhaust gas recirculation lines G4, G5, and G7 is performed for a predetermined time set in advance.
  • the exhaust gas recirculation lines G4, G5 and G7 generate a gas flow to the exhaust line G3 side, and are taken from the purge gas supply line G11.
  • the exhausted air is exhausted to the outside through the exhaust gas recirculation lines G4, G5, G7, the purge gas exhaust line G12, and the exhaust line G3.
  • the control device 60 determines whether or not a specified time has elapsed since the number of revolutions of the EGR blower 50 has been reduced.
  • the purge processing of the exhaust gas recirculation lines G4, G5, G7 is performed until the specified time has elapsed, and when the specified time has elapsed, the operation of the EGR blower 50 is stopped in step S39, and in step S40.
  • the purge valve 61 is closed, the exhaust valve 62 is closed in step S41, and the purge process of the exhaust gas recirculation lines G4, G5, G7 is completed in step S42.
  • the purge process of the exhaust gas recirculation lines G4, G5, G7 when the operation of the engine main body 11 is stopped during the purge process of the exhaust gas recirculation lines G4, G5, G7 has been described. It is not necessary to purge the lines G4, G5 and G7.
  • the control device 60 may execute the above-described processing upon receiving a purge processing start signal by the occupant turning on the purge processing switch. .
  • the purge device can select discharge of the purge gas according to the operation state of the ship. That is, as shown in FIG. 9, when the operation of the engine and the EGR is stopped in the ECA at the time of entry of the ship, the exhaust line together with the remaining corrosive components of the air supplied to the exhaust gas recirculation line G4. Discharge to G3. On the other hand, at the time of departure of the ship, as in FIG. 4, if the operation of the EGR is stopped without stopping the operation of the engine outside the ECA, the purge gas supplied to the exhaust gas recirculation line G4 remains. It discharges to scavenging air trunk 22 (engine) with an ingredient.
  • a purge gas supply line G11, a purge valve 61, a purge gas discharge line G12, and an exhaust valve 62 are provided as a purge device.
  • the exhaust gas recirculation line G7 functions as a first purge gas discharge line
  • the purge gas discharge line G12 functions as a second purge gas discharge line.
  • the purge gas can be supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4, and the corrosive components can be discharged together with the purge gas from the exhaust gas recirculation line G7 or the purge gas discharge line G12. That is, the supply of the purge gas and the discharge of the purge gas and the corrosive component can be properly performed.
  • the purge device is provided with a purge gas discharge line G12 for supplying the purge gas from the purge gas supply line G11 to the exhaust line G3, and an exhaust valve 62 for opening and closing the purge gas supply line G12. Therefore, by opening the exhaust valve 62, the purge gas supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is supplied from the purge gas discharge line G12 to the exhaust line G3 without passing through the engine main body 11. Even if the operation of the engine body 11 is stopped, the purge gas from which the corrosive components remaining in the exhaust gas recirculation line G have been removed can be properly processed.
  • the control device 60 opens the purge valve 61 and the exhaust valve 62 for a predetermined period when the engine operation stop signal (purge process start signal) is input. Therefore, even if the EGR operation is stopped and the operation of the engine main body 11 is stopped, the purge gas of the exhaust gas recirculation line G4 can be supplied from the purge gas discharge line G12 to the exhaust line G3, and the exhaust gas recirculation line G4, The purge gas from which the corrosive components remaining in G5 and G7 have been removed can be properly processed.
  • FIG. 10 is a schematic configuration diagram showing an EGR system of the third embodiment.
  • the members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
  • the EGR system 13 includes an exhaust gas recirculation line G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower 50, a purge device, and a control device. It has 60.
  • the EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances.
  • the purge device includes a purge gas supply line G13, a purge valve 61, a purge gas discharge line G12, and an exhaust valve 62.
  • the purge device supplies a purge gas from the purge gas supply line G13, and discharges a corrosive component together with the purge gas from the exhaust gas recirculation line G7 or the purge gas discharge line G12.
  • one end of the purge gas supply line G13 is connected between the scavenging air trunk and the air cooler 52 in the air supply line G1, and the other end is between the EGR inlet valve 41 and the scrubber 42 in the exhaust gas recirculation line G4.
  • Is linked to The purge gas supply line G13 is provided with a purge valve 61, and the purge gas supply line G13 can be opened and closed.
  • the EGR inlet valve 41 is closed and the purge valve 61 is opened, a part of scavenging gas (combustion gas) in the air supply line G1 is sucked as purge gas from one end of the purge gas supply line G13 and passes through the purge gas supply line G13.
  • the exhaust gas recirculation line G4 can be supplied.
  • the air supplied from the purge gas supply line G13 to the exhaust gas recirculation line G4 is supplied to the scavenging trunk 22 of the engine body 11 through the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1.
  • the control device 60 reduces the rotational speed of the EGR blower 50 when the EGR operation stop signal S2 is input. Thereafter, the EGR inlet valve 41 is closed and the purge valve 61 is opened. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, part of the scavenging air in the air supply line G1 is supplied to the purge gas supply line G13, and the air supplied from the purge gas supply line G13 to the exhaust gas recirculation line G4 is an exhaust gas recirculation line G4, G5, G7, the air supply It is supplied to the scavenging air trunk 22 of the engine body 11 through the line G1. Therefore, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are removed by the purge gas, and the purge gas containing the corrosive components is sent to the scavenging trunk 22.
  • the purge gas is supplied to the exhaust gas recirculation lines G4, G5, G7 from between the exhaust gas recirculation line G4, the EGR inlet valve 41, and the scrubber 42 to remain.
  • the purge device is provided with a purge gas supply line G13 as a purge device for discharging the corrosive components, and the purge device supplies a part of the scavenging gas supplied to the engine main body 11 to the exhaust gas recirculation lines G4, G5, G7 as a purge gas.
  • the purge device supplies part of the scavenging gas as the purge gas from the purge gas supply line G13 to the exhaust gas recirculation lines G4, G5, G7
  • the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are exhausted together with the scavenging Ru. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, it is possible to prevent the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7.
  • FIG. 11 is a schematic block diagram showing the EGR system of the fourth embodiment
  • FIG. 12 is a flowchart showing purge control at the time of EGR operation stop in the EGR system.
  • the members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
  • the EGR system 13 includes exhaust gas recirculation lines G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower 50, a purge device, and a control device. It has 60.
  • the EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances.
  • the purge device includes a purge gas supply line G15 and a purge valve 71.
  • the exhaust gas recirculation line G4 functions as a purge gas discharge line.
  • the purge device supplies a purge gas from the purge gas supply line G15 to the exhaust gas recirculation line G7, and discharges the purge gas and the corrosive component from the exhaust line G3.
  • the purge gas supply line G15 has one end opened to the atmosphere and the other end connected to the downstream side of the exhaust gas recirculation line G4 between the EGR blower 50 and the EGR outlet valve 51 in the exhaust gas recirculation line G7. It is connected.
  • the purge gas supply line G15 is provided with a purge valve 71, and the purge gas supply line G15 can be opened and closed. Therefore, closing the EGR outlet valve 51 and opening the purge valve 71 sucks outside air (air) as purge gas from one end of the purge gas supply line G15 and supplies it to the exhaust gas recirculation line G7 through the purge gas supply line G15.
  • a compressed air supply source may be connected to one end of the purge gas supply line G15.
  • the compressed air supply source 63 includes, for example, a compressor and a pressure accumulation tank, and the compressed air generated by the compressor is stored in the pressure accumulation tank, and the compressed air is supplied to various devices used in the ship. Can be supplied. In this case, the purge gas can be supplied without driving the EGR blower 50.
  • the EGR blower 50 Since the EGR blower 50 is provided in the path of the exhaust gas recirculation lines G4, G5, G7, the gas flow from the exhaust gas supply line G7 to the exhaust line G3 side is operated by driving the EGR blower 50 in reverse. It can be done. Therefore, by driving the EGR blower 50 in reverse, the air supplied from the purge gas supply line G15 to the exhaust gas supply line G7 is supplied from the exhaust gas supply line G7 to the exhaust line G3.
  • the control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, and the purge valve 71 in accordance with the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50. That is, the control device 60 receives the EGR operation start signal S1 and opens the EGR inlet valve 41 and the EGR outlet valve 51 if the current operation area of the ship is in the NOx control area where emission of NOx is restricted. At the same time, the EGR blower 50 is driven to rotate normally. Then, a part of the exhaust gas discharged from the engine body 11 is supplied from the exhaust line G3 to the exhaust gas recirculation line G4.
  • the control device 60 receives the EGR operation stop signal S2 when the current operation area of the ship moves from inside the ECA to outside the ECA, closes the EGR outlet valve 51, opens the purge valve 71, and the EGR blower 50. Drive in reverse. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, the air supplied from the purge gas supply line G15 to the exhaust gas recirculation line G7 is supplied to the exhaust line G3.
  • step S51 when the EGR operation stop signal S2 is input in step S51, the control device 60 starts the EGR operation stop sequence, and step S52 Then, the rotation of the EGR blower 50 is stopped, and in step S53, it is determined whether the rotation of the EGR blower 50 has stopped.
  • the process waits until the rotation of the EGR blower 50 stops, and when the rotation of the EGR blower 50 stops, the process proceeds to step S56.
  • step S54 the closing operation of the EGR outlet valve 51 is started, and in step S55, it is determined whether the opening degree of the EGR outlet valve 51 has become equal to or less than a preset opening degree.
  • the process waits until the opening degree of the EGR outlet valve 51 becomes equal to or less than the set opening degree, and when the opening degree of the EGR outlet valve 51 is fully closed, the process proceeds to step S56.
  • step S56 the controller 60 starts the opening operation of the purge valve 71, and in step S57 determines whether the opening degree of the purge valve 71 is fully opened.
  • the process waits until the opening degree of the purge valve 71 is fully opened, and when the opening degree of the purge valve 71 is fully opened, reverse driving of the EGR blower 50 is started in step S58, exhaust gas recirculation in step S59.
  • the purge process of the line G4 is executed for a predetermined time set in advance. That is, since the EGR blower 50 is reversely driven, the exhaust gas recirculation line G4 has a gas flow toward the exhaust line G3, and the air taken in from the purge gas supply line G15 is the exhaust gas recirculation line.
  • the control device 60 determines whether or not a specified time has elapsed since the EGR blower 50 started reverse driving.
  • the purge process of the exhaust gas recirculation lines G4, G5, G7 is executed until the specified time has elapsed.
  • the operation of the EGR blower 50 is stopped in step S61, the purge valve 71 is closed in step S62, the EGR inlet valve 41 is closed in step S63, and the process is performed in step S64.
  • the purge process of the exhaust gas recirculation lines G4, G5 and G7 is completed.
  • the corrosive components remaining in the exhaust gas recirculation lines G4, G5 and G7 are discharged to the exhaust line G3 by the purge gas, even if the operation of the engine main body 11 is stopped, the procedure described above is performed.
  • the corrosion components remaining in the exhaust gas recirculation lines G4, G5 and G7 can be purged.
  • exhaust gas recirculation lines G4, G5, G7 recirculate a part of the exhaust gas discharged from the engine main body 11 to the engine main body 11 as a part of the combustion gas.
  • a purge gas supply line G15 is provided as a purge device that supplies purge gas to G4, G5, and G7 and discharges the remaining corrosive components.
  • the purge device supplies the purge gas from the purge gas supply line G15 to the exhaust gas recirculation line G7, and the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are together with the purge gas. Exhausted. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, it is possible to prevent the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7.
  • a purge gas supply line G15 connected to the downstream side of the exhaust gas recirculation line G7 downstream of the EGR blower 50 (between the EGR blower 50 and the EGR outlet valve 51), and a purge gas supply
  • a purge valve 71 for opening and closing the line G15 and an EGR blower 50 for feeding the purge gas from the purge gas supply line G15 in the reverse direction to the exhaust gas recirculation lines G4, G5 and G7 are provided.
  • the purge valve 71 is opened and the EGR blower 50 is reversely driven, whereby the purge gas is discharged from the purge gas supply line G15 through the exhaust gas recirculation lines G4, G5, G7 to the exhaust line G3.
  • the corrosive components remaining in the exhaust gas recirculation line G4 including the scrubber 42, the demister unit 49, and the EGR blower 50 can be removed, and the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7. Can be properly removed.
  • the EGR system of the fourth embodiment is provided with a control device 60 which closes the EGR outlet valve 51 and opens the purge valve 71 for a predetermined period when the EGR operation stop signal S2 is input. Therefore, the control device 60 closes the EGR outlet valve 51 and opens the purge valve 71 for a predetermined period when the EGR operation stop signal S2 is input. Therefore, when the EGR operation is stopped, the purge gas is recirculated from the purge gas supply line G15. The gas is supplied to the line G4, and the corrosive components remaining in the exhaust gas recirculation line G4 can be removed early by the purge gas.
  • FIG. 13 is a schematic configuration diagram showing an EGR system of a fifth embodiment.
  • the members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
  • the EGR system 13 includes an exhaust gas recirculation line G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower 50, a purge device, and a control device. It has 60.
  • the EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances.
  • the purge device includes a purge gas supply line G16, a purge valve 71, and an exhaust line G3.
  • the purge device supplies the purge gas from the purge gas supply line G16 to the exhaust gas recirculation line G7, and discharges the purge gas and the corrosive component from the exhaust line G3.
  • one end of the purge gas supply line G16 is connected between the scavenging air trunk and the air cooler 52 in the air supply line G1, and the other end is the EGR blower 50 and the EGR outlet valve 51 in the exhaust gas recirculation line G7. It is connected between.
  • the purge gas supply line G16 is provided with a purge valve 71, and this purge gas supply line G16 can be opened and closed.
  • the control device 60 closes the EGR outlet valve 51 and opens the purge valve 71 when the EGR operation stop signal S2 is input. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, part of the scavenging air of the air supply line G1 is supplied to the purge gas supply line G16, and is supplied from the purge gas supply line G16 to the exhaust line G3 through the exhaust gas recirculation lines G4, G5, G7. Therefore, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are removed by the purge gas, and the purge gas containing the corrosive components is discharged to the exhaust line G3.
  • the exhaust gas recirculation lines G4, G5, G7, the EGR inlet valve 41, the scrubber 42, the EGR blower 50, the EGR outlet valve 51, the exhaust gas recirculation A purge gas is supplied to the line G7 to provide a purge gas supply line G16 as a purge device for discharging remaining corrosive components.
  • the purge device uses a part of scavenging gas supplied to the engine main body 11 as a purge gas. Supply to
  • the purge device supplies a part of scavenging gas as the purge gas from the purge gas supply line G16 to the exhaust gas recirculation line G4, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are discharged together with the scavenging air. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, it is possible to prevent the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7.
  • the marine diesel engine has been described using the main engine, but the invention can also be applied to a diesel engine used as a generator.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

By providing an EGR system with an exhaust gas recirculation line (G4) that recirculates a portion of the exhaust gas discharged from an engine body (11) to the engine body (11) as a portion of gas for combustion, an EGR inlet valve (41) that is provided in the exhaust gas recirculation line (G4), and a purge gas supply line (G11) that serves as a purging device that supplies a purge gas to the exhaust gas recirculation line (G4) and discharges a remaining corrosive component, piping corrosion is prevented by removing the corrosive component that remains in the exhaust gas recirculation line.

Description

ＥＧＲシステムEGR system
　本発明は、内燃機関の燃焼室から排出された排ガスの一部を燃焼室に戻すことで、排ガス中のＮＯｘを低減するＥＧＲシステムに関するものである。 The present invention relates to an EGR system that reduces NOx in exhaust gas by returning a part of the exhaust gas discharged from the combustion chamber of an internal combustion engine to the combustion chamber.
　排ガス中のＮＯｘを低減するものとしては、排ガス再循環（ＥＧＲ）がある。このＥＧＲは、内燃機関の燃焼室から排気ラインに排出された排ガスの一部を排気ガス再循環ラインに分岐し、燃焼用空気に混入して燃焼用ガスとし、燃焼室に戻すものである。そのため、燃焼用ガスは、酸素濃度が低下し、燃料と酸素との反応である燃焼の速度を遅らせることで燃焼温度が低下し、ＮＯｘの発生量を減少させることができる。 An exhaust gas recirculation (EGR) is one that reduces NOx in the exhaust gas. This EGR branches a part of the exhaust gas discharged from the combustion chamber of the internal combustion engine to the exhaust line to the exhaust gas recirculation line, mixes it in the combustion air to make it a combustion gas, and returns it to the combustion chamber. Therefore, the combustion gas has a reduced oxygen concentration, and the combustion temperature is reduced by delaying the rate of combustion, which is the reaction between the fuel and oxygen, whereby the amount of NOx generation can be reduced.
　ところで、排気ガス再循環ラインは、配管により構成されており、ＥＧＲ運転時には、排ガス（排気再循環ガス）が流れている。この排ガスは、ＮＯｘやＳＯｘなどの腐食成分が含まれていることから、この腐食成分が配管の内面に付着して残留する。この腐食成分は、酸露点以下になると、硝酸や硫酸となり、配管が腐食してしまうおそれがある。なお、硫酸結露による脱硝触媒の劣化を防止するものとして、例えば、特許文献１に記載されたものがある。 By the way, the exhaust gas recirculation line is constituted by piping, and at the time of EGR operation, exhaust gas (exhaust gas recirculation gas) flows. Since this exhaust gas contains corrosive components such as NOx and SOx, the corrosive components adhere and remain on the inner surface of the pipe. When this corrosive component is below the acid dew point, it becomes nitric acid or sulfuric acid, which may cause corrosion of the piping. In addition, there exist some which were described in patent document 1, for example as what prevents deterioration of the NOx removal catalyst by sulfuric acid condensation.
特開２０１４－０３１７５６号公報JP, 2014-031756, A
　上述した特許文献１に記載されたレシプロエンジン用排ガス脱硝設備は、硫酸結露による脱硝触媒の劣化を防止するものであり、排気再循環ガスに含まれる腐食成分に対応するものではない。 The exhaust gas denitration equipment for a reciprocating engine described in Patent Document 1 described above prevents deterioration of the denitration catalyst due to sulfuric acid condensation, and does not correspond to the corrosive component contained in the exhaust gas recirculation gas.
　本発明は上述した課題を解決するものであり、排気ガス再循環ラインに残留する腐食成分を除去することで配管腐食を防止するＥＧＲシステムを提供することを目的とする。 The present invention solves the above-mentioned problems, and an object of the present invention is to provide an EGR system that prevents pipe corrosion by removing corrosive components remaining in an exhaust gas recirculation line.
　上記の目的を達成するための本発明のＥＧＲシステムは、エンジンから排出された排ガスの一部を燃焼用ガスの一部として前記エンジンに再循環する排ガス再循環ラインと、前記排ガス再循環ラインに設けられるＥＧＲ入口バルブと、前記排ガス再循環ラインにパージガスを供給して残留する腐食成分を排出するパージ装置と、を備えることを特徴とするものである。 In order to achieve the above object, the EGR system of the present invention comprises an exhaust gas recirculation line for recirculating a part of exhaust gas discharged from an engine to the engine as a part of combustion gas, and the exhaust gas recirculation line It is characterized by comprising an EGR inlet valve provided, and a purge device for supplying a purge gas to the exhaust gas recirculation line to discharge the remaining corrosive components.
　従って、ＥＧＲ入口バルブが開放されると、エンジンから排出された排ガスの一部が排ガス再循環ラインに供給され、スクラバにより排ガスから有害物質が除去された後にエンジンに再循環される。その後、ＥＧＲ入口バルブが閉止されると、排ガス再循環ラインにスクラバで除去されなかった腐食成分が残留する。このとき、パージ装置が排ガス再循環ラインにパージガスを供給すると、排ガス再循環ラインに残留した腐食成分がパージガスと共に排出される。そのため、排ガス再循環ラインに残留する腐食成分を除去することで、排ガス再循環ラインを構成する配管の腐食を防止することができる。 Therefore, when the EGR inlet valve is opened, a part of the exhaust gas discharged from the engine is supplied to the exhaust gas recirculation line and recirculated to the engine after the scrubber has removed harmful substances from the exhaust gas. Thereafter, when the EGR inlet valve is closed, corrosive components that have not been removed by the scrubber remain in the exhaust gas recirculation line. At this time, when the purge device supplies the purge gas to the exhaust gas recirculation line, the corrosive components remaining in the exhaust gas recirculation line are discharged together with the purge gas. Therefore, corrosion of the piping which comprises an exhaust gas recirculation line can be prevented by removing the corrosion component which remains in an exhaust gas recirculation line.
　本発明のＥＧＲシステムでは、前記パージ装置は、前記排ガス再循環ラインにパージガスを供給するパージガス供給ラインと、パージガスと共に残留する腐食成分を排出するパージガス排出ラインとを備えることを特徴としている。 In the EGR system according to the present invention, the purge device includes a purge gas supply line for supplying a purge gas to the exhaust gas recirculation line, and a purge gas discharge line for discharging a corrosive component remaining with the purge gas.
　従って、パージガスをパージガス供給ラインから排ガス再循環ラインに供給され、パージガスと腐食成分がパージガス排出ラインから排出されることとなり、パージガスの供給とパージガス及び腐食成分の排出を適正に実施することができる。 Therefore, the purge gas is supplied from the purge gas supply line to the exhaust gas recirculation line, the purge gas and the corrosive component are discharged from the purge gas discharge line, and the supply of the purge gas and the discharge of the purge gas and the corrosive component can be properly performed.
　本発明のＥＧＲシステムでは、前記排ガス再循環ラインにおける前記ＥＧＲ入口バルブより下流側に設けられるスクラバを備え、前記パージガス供給ラインは、前記排ガス再循環ラインにおける前記ＥＧＲ入口バルブと前記スクラバとの間に連結され、前記パージガス供給ラインを開閉するパージバルブが設けられることを特徴としている。 In the EGR system of the present invention, the exhaust gas recirculation line further includes a scrubber provided downstream of the EGR inlet valve in the exhaust gas recirculation line, and the purge gas supply line is between the EGR inlet valve and the scrubber in the exhaust gas recirculation line. A purge valve may be provided to open and close the purge gas supply line.
　従って、ＥＧＲ入口バルブが閉止されると、パージバルブを開放することで、パージガスがパージガス供給ラインから排ガス再循環ラインにおけるＥＧＲ入口バルブとスクラバとの間に供給されることとなり、スクラバを含む排ガス再循環ラインに残留する腐食成分を除去することができ、排ガス再循環ラインに残留する腐食成分を適正に除去することができる。 Therefore, when the EGR inlet valve is closed, by opening the purge valve, the purge gas is supplied from the purge gas supply line between the EGR inlet valve and the scrubber in the exhaust gas recirculation line, and the exhaust gas recirculation including the scrubber Corrosive components remaining in the line can be removed, and corrosive components remaining in the exhaust gas recirculation line can be properly removed.
　本発明のＥＧＲシステムでは、ＥＧＲ運転停止信号が入力したときに前記ＥＧＲ入口バルブを閉止して前記パージバルブを所定期間だけ開放することを特徴としている。 The EGR system according to the present invention is characterized in that when the EGR operation stop signal is input, the EGR inlet valve is closed to open the purge valve for a predetermined period.
　従って、ＥＧＲ運転停止信号が入力すると、ＥＧＲ入口バルブを閉止してパージバルブを所定期間だけ開放するため、ＥＧＲ運転が停止すると、パージガスがパージガス供給ラインから排ガス再循環ラインに供給されることとなり、パージガスにより早期に排ガス再循環ラインに残留する腐食成分を除去することができる。 Therefore, when the EGR operation stop signal is input, the EGR inlet valve is closed and the purge valve is opened for a predetermined period. Therefore, when the EGR operation is stopped, the purge gas is supplied from the purge gas supply line to the exhaust gas recirculation line. Thus, the corrosive components remaining in the exhaust gas recirculation line can be removed earlier.
　本発明のＥＧＲシステムでは、前記パージガス排出ラインは、前記パージガス供給ラインからのパージガスを前記排ガス再循環ラインから前記エンジンに排出する第１パージガス排出ラインが設けられることを特徴としている。 In the EGR system of the present invention, the purge gas discharge line is provided with a first purge gas discharge line for discharging the purge gas from the purge gas supply line from the exhaust gas recirculation line to the engine.
　従って、排ガス再循環ラインに残留する有害物質を除去したパージガスを第１パージガス排出ラインからエンジンに排出するため、有害物質をエンジンで処理することができると共に、エンジンからの排ガスを処理することで、外部への放出を抑制することができる。 Therefore, since the purge gas from which the harmful substance remaining in the exhaust gas recirculation line has been removed is discharged from the first purge gas exhaust line to the engine, the harmful substance can be processed by the engine and the exhaust gas from the engine can be processed. It can suppress the release to the outside.
　本発明のＥＧＲシステムでは、前記パージガス排出ラインは、前記パージガス供給ラインからのパージガスを排気ラインに排出する第２パージガス排出ラインが設けられ、前記第２パージガス排出ラインを開閉する排気バルブが設けられることを特徴としている。 In the EGR system of the present invention, the purge gas discharge line is provided with a second purge gas discharge line for discharging the purge gas from the purge gas supply line to the exhaust line, and an exhaust valve for opening and closing the second purge gas discharge line. It is characterized by
　従って、排気バルブを開放することで、パージガス供給ラインから排ガス再循環ラインに供給されたパージガスが、第２パージガス排出ラインから排気ラインに排出されることとなり、エンジンの運転が停止していても、排ガス再循環ラインに残留する有害物質を除去したパージガスを適正に処理することができる。 Therefore, by opening the exhaust valve, the purge gas supplied from the purge gas supply line to the exhaust gas recirculation line is discharged from the second purge gas discharge line to the exhaust line, and even if the operation of the engine is stopped, The purge gas from which harmful substances remaining in the exhaust gas recirculation line have been removed can be properly processed.
　本発明のＥＧＲシステムでは、ＥＧＲ運転が停止しているとき、前記排気バルブを所定期間だけ開放することを特徴としている。 The EGR system according to the present invention is characterized in that when the EGR operation is stopped, the exhaust valve is opened for a predetermined period.
　従って、ＥＧＲ運転が停止しているとき、排気バルブを所定期間だけ開放するため、ＥＧＲの運転が停止し、エンジンの運転が停止していても、排ガス再循環ラインのパージガスをパージガス排出ラインから排気ラインに送給することができ、排ガス再循環ラインに残留する腐食成分を除去したパージガスを適正に処理することができる。 Therefore, when the EGR operation is stopped, the exhaust valve is opened for a predetermined period, so the EGR operation is stopped and the purge gas of the exhaust gas recirculation line is exhausted from the purge gas discharge line even if the engine operation is stopped. It can be fed to the line, and the purge gas from which the corrosive components remaining in the exhaust gas recirculation line have been removed can be properly processed.
　本発明のＥＧＲシステムでは、前記パージ装置は、外気をパージガスとして前記排ガス再循環ラインに供給することを特徴としている。 In the EGR system of the present invention, the purge device is characterized in that outside air is supplied to the exhaust gas recirculation line as a purge gas.
　従って、排ガス再循環ラインに外気を供給して残留する有害物質を排出することから、排ガス再循環ラインに有害物質を残留させることなく、高精度にパージ処理することができ、また、パージ装置の配管系を簡素化することができる。 Therefore, since the outside air is supplied to the exhaust gas recirculation line to discharge the remaining harmful substances, the purge process can be performed with high accuracy without leaving the harmful substances in the exhaust gas recirculation line. The piping system can be simplified.
　本発明のＥＧＲシステムでは、前記パージ装置は、前記エンジンに供給される掃気の一部をパージガスとして前記排ガス再循環ラインに供給することを特徴としている。 In the EGR system of the present invention, the purge device is characterized in that a part of scavenging air supplied to the engine is supplied to the exhaust gas recirculation line as a purge gas.
　従って、排ガス再循環ラインにエンジンへの掃気の一部を抜き取って供給することで、残留する有害物質を排出することから、排ガス再循環ラインを適正にパージ処理することができる。 Therefore, by removing and supplying a part of the scavenging air to the exhaust gas recirculation line to discharge the remaining harmful substances, it is possible to properly purge the exhaust gas recirculation line.
　本発明のＥＧＲシステムでは、前記パージ装置は、圧縮空気をパージガスとして前記排ガス再循環ラインに供給することを特徴としている。 In the EGR system of the present invention, the purge device is characterized in that compressed air is supplied as a purge gas to the exhaust gas recirculation line.
　従って、排ガス再循環ラインに圧縮空気を供給して残留する有害物質を排出することから、排ガス再循環ラインを適正にパージ処理することができる。 Therefore, the exhaust gas recirculation line can be properly purged since the compressed air is supplied to the exhaust gas recirculation line to discharge the remaining harmful substances.
　本発明のＥＧＲシステムでは、前記排ガス再循環ラインにおける前記ＥＧＲ入口バルブより下流側に設けられるスクラバを備え、前記パージガス供給ラインは、前記排ガス再循環ラインにおける前記スクラバより下流側に連結され、前記パージガス供給ラインを開閉するパージバルブと、前記パージガス供給ラインからのパージガスを前記排ガス再循環ラインを逆方向に送給するブロワとが設けられることを特徴としている。 In the EGR system of the present invention, a scrubber is provided downstream of the EGR inlet valve in the exhaust gas recirculation line, and the purge gas supply line is connected downstream of the scrubber in the exhaust gas recirculation line, and the purge gas A purge valve for opening and closing a supply line, and a blower for supplying a purge gas from the purge gas supply line in the reverse direction of the exhaust gas recirculation line are provided.
　従って、ＥＧＲ出口バルブが閉止されると、パージバルブを開放すると共にブロワを逆回転方向に作動することで、パージガスがパージガス供給ラインから排ガス再循環ラインにおけるスクラバより下流側に供給されることとなり、スクラバを含む排ガス再循環ラインに残留する有害物質を除去することができ、排ガス再循環ラインに残留する腐食成分を適正に除去することができる。 Therefore, when the EGR outlet valve is closed, the purge valve is opened and the blower is operated in the reverse rotation direction, whereby the purge gas is supplied from the purge gas supply line to the downstream side of the exhaust gas recirculation line downstream of the scrubber. It is possible to remove the harmful substances remaining in the exhaust gas recirculation line including the above, and to properly remove the corrosive components remaining in the exhaust gas recirculation line.
　本発明のＥＧＲシステムでは、前記パージガス供給ラインは、前記パージガス供給ラインからのパージガスを前記排ガス再循環ラインから排気ラインに排出することを特徴としている。 In the EGR system of the present invention, the purge gas supply line discharges the purge gas from the purge gas supply line from the exhaust gas recirculation line to an exhaust line.
　従って、排ガス再循環ラインに残留する有害物質を除去したパージガスを排気ラインに排出するため、有害物質をエンジンの排気系で処理することができ、外部への放出を抑制することができる。 Therefore, since the purge gas from which the harmful substance remaining in the exhaust gas recirculation line has been removed is discharged to the exhaust line, the harmful substance can be treated by the exhaust system of the engine, and emission to the outside can be suppressed.
　本発明のＥＧＲシステムでは、前記排ガス再循環ラインにおける前記パージガス供給ラインの連結部より下流側に設けられるＥＧＲ出口バルブと、ＥＧＲ運転を停止したときに前記ＥＧＲ出口バルブを閉止して前記パージバルブを所定期間だけ開放することを特徴としている。 In the EGR system according to the present invention, the EGR outlet valve provided downstream of the connection portion of the purge gas supply line in the exhaust gas recirculation line, and the EGR outlet valve closed when the EGR operation is stopped to set the purge valve It is characterized by opening only for a period.
　従って、ＥＧＲ運転を停止すると、ＥＧＲ出口バルブを閉止してパージバルブを所定期間だけ開放するため、ＥＧＲ運転が停止すると、パージガスがパージガス供給ラインから排ガス再循環ラインに供給されることとなり、パージガスにより早期に排ガス再循環ラインに残留する有害物質を除去することができる。 Therefore, when the EGR operation is stopped, the EGR outlet valve is closed and the purge valve is opened for a predetermined period. Therefore, when the EGR operation is stopped, the purge gas is supplied from the purge gas supply line to the exhaust gas recirculation line. It is possible to remove harmful substances remaining in the exhaust gas recirculation line.
　本発明のＥＧＲシステムによれば、排ガス再循環ラインにパージガスを供給して残留する有害物質を排出するパージ装置を設けるので、排ガス再循環ラインを構成する配管の腐食を防止することができる。 According to the EGR system of the present invention, since the purge device for supplying the purge gas to the exhaust gas recirculation line to discharge the remaining harmful substances is provided, it is possible to prevent the corrosion of the piping that constitutes the exhaust gas recirculation line.
図１は、第１実施形態のＥＧＲシステムを表す概略構成図である。FIG. 1 is a schematic configuration view showing an EGR system of the first embodiment. 図２は、第１実施形態のＥＧＲシステムにおけるＥＧＲ運転停止時のパージ制御を表すフローチャートである。FIG. 2 is a flow chart showing purge control when the EGR operation is stopped in the EGR system of the first embodiment. 図３は、第１実施形態の船舶の入港時におけるＥＧＲシステムの作動を表すフローチャートである。FIG. 3 is a flow chart showing the operation of the EGR system at the time of entry of the ship of the first embodiment. 図４は、第１実施形態の船舶の出港時におけるＥＧＲシステムの作動を表すフローチャートである。FIG. 4 is a flow chart showing the operation of the EGR system at the time of departure of the ship of the first embodiment. 図５は、パージ時間に対する排気ガス再循環ラインのＳＯ２濃度を表すグラフである。FIG. 5 is a graph showing the SO 2 concentration of the exhaust gas recirculation line against the purge time. 図６は、パージ時間に対する排気ガス再循環ラインのＳＯ２濃度の詳細を表すグラフである。FIG. 6 is a graph showing details of the SO 2 concentration in the exhaust gas recirculation line with respect to the purge time. 図７は、第２実施形態のＥＧＲシステムを表す概略構成図である。FIG. 7 is a schematic block diagram showing the EGR system of the second embodiment. 図８は、第２実施形態のＥＧＲシステムにおけるエンジン運転停止時のパージ制御を表すフローチャートである。FIG. 8 is a flowchart showing purge control at the time of engine operation stop in the EGR system of the second embodiment. 図９は、第２実施形態の船舶の入港時におけるＥＧＲシステムの作動を表すフローチャートである。FIG. 9 is a flow chart showing the operation of the EGR system at the time of entry of the ship of the second embodiment. 図１０は、第３実施形態のＥＧＲシステムを表す概略構成図である。FIG. 10 is a schematic configuration diagram showing an EGR system of the third embodiment. 図１１は、第４実施形態のＥＧＲシステムを表す概略構成図である。FIG. 11 is a schematic configuration diagram showing an EGR system of a fourth embodiment. 図１２は、第４実施形態のＥＧＲシステムにおけるＥＧＲ運転停止時のパージ制御を表すフローチャートである。FIG. 12 is a flowchart showing purge control at the time of EGR operation stop in the EGR system of the fourth embodiment. 図１３は、第５実施形態のＥＧＲシステムを表す概略構成図である。FIG. 13 is a schematic configuration diagram showing an EGR system of a fifth embodiment.
　以下に添付図面を参照して、本発明に係るＥＧＲシステムの好適な実施形態を詳細に説明する。なお、この実施形態により本発明が限定されるものではなく、また、実施形態が複数ある場合には、各実施形態を組み合わせて構成するものも含むものである。 Hereinafter, preferred embodiments of an EGR system according to the present invention will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited by the embodiments, and in the case where there are a plurality of embodiments, the present invention also includes those configured by combining the respective embodiments.
［第１実施形態］
　図１は、第１実施形態のＥＧＲシステムを表す概略構成図である。 First Embodiment
FIG. 1 is a schematic configuration view showing an EGR system of the first embodiment.
　第１実施形態にて、図１に示すように、舶用ディーゼルエンジン１０は、エンジン本体１１と、過給機１２と、エアクーラ５２と、ＥＧＲシステム１３を備えている。 In the first embodiment, as shown in FIG. 1, the marine diesel engine 10 includes an engine body 11, a supercharger 12, an air cooler 52, and an EGR system 13.
　エンジン本体１１は、図示しないが、プロペラ軸を介して推進用プロペラを駆動回転させる推進用の機関（主機関）である。このエンジン本体１１は、ユニフロー掃排気式のディーゼルエンジンであって、２ストロークディーゼルエンジンであり、シリンダ内の吸排気の流れを下方から上方への一方向とし、排気の残留を無くすようにしたものである。エンジン本体１１は、ピストンが上下移動する複数のシリンダ（燃焼室）２１と、シリンダ２１に連通する掃気トランク２２と、シリンダ２１に連通する排気マニホールド２３とを有している。そして、エンジン本体１１は、掃気トランク２２に給気ラインＧ１が連結され、排気マニホールド２３に排気ラインＧ２が連結されている。 Although not shown, the engine body 11 is a propulsion engine (main engine) that drives and rotates a propulsion propeller via a propeller shaft. The engine body 11 is a uniflow scavenging diesel engine, which is a two-stroke diesel engine, in which the flow of intake and exhaust in the cylinder is one direction from the lower side to the upper side, and the residual of the exhaust is eliminated. It is. The engine body 11 has a plurality of cylinders (combustion chambers) 21 in which pistons move up and down, a scavenging air trunk 22 in communication with the cylinders 21, and an exhaust manifold 23 in communication with the cylinders 21. The engine body 11 has the scavenging air trunk 22 connected to the air supply line G1 and the exhaust manifold 23 connected to the exhaust line G2.
　過給機１２は、コンプレッサ３１とタービン３２とが回転軸３３により一体に回転するように連結されて構成されている。この過給機１２は、エンジン本体１１の排気ラインＧ２から排出された排ガスによりタービン３２が回転し、タービン３２の回転が回転軸３３により伝達されてコンプレッサ３１が回転し、このコンプレッサ３１が燃焼用ガス（空気及び／または再循環ガス）を圧縮して給気ラインＧ１からエンジン本体１１に供給する。 The turbocharger 12 is configured by connecting a compressor 31 and a turbine 32 so as to rotate integrally with a rotating shaft 33. In the turbocharger 12, the turbine 32 is rotated by the exhaust gas discharged from the exhaust line G2 of the engine body 11, the rotation of the turbine 32 is transmitted by the rotation shaft 33, and the compressor 31 is rotated. Gas (air and / or recycle gas) is compressed and supplied to the engine main body 11 from the air supply line G1.
　コンプレッサ３１には、更に、外部から空気を吸入する吸入ラインＧ６と、ＥＧＲブロワ５０により排ガスが送られる排ガス再循環ラインＧ７が設けられており、ＥＧＲ運転時には、吸入ラインＧ６からの空気と、排ガス再循環ラインＧ７からの排ガス（再循環ガス）が混合器（図示略）で混合されることで燃焼用ガスが生成される。なお、混合器は、必ずしも排ガスと空気を混合する機能のみを備える装置である必要はなく、コンプレッサに装着されるサイレンサ（図示略）に上記の機能を備えたものを混合器として設けてもよい。 The compressor 31 is further provided with a suction line G6 for sucking air from the outside, and an exhaust gas recirculation line G7 to which exhaust gas is sent by the EGR blower 50. During EGR operation, air from the suction line G6, exhaust gas The exhaust gas (recirculation gas) from the recirculation line G7 is mixed by a mixer (not shown) to generate a combustion gas. The mixer does not necessarily have to be a device having only the function of mixing the exhaust gas with the air, and a silencer (not shown) attached to the compressor may be provided with the above-described function as a mixer. .
　タービン３２は、このタービン３２を回転させた排ガスを排出する排気ラインＧ３が連結されており、この排気ラインＧ３は、図示しない排ガス処理装置を介して煙突（ファンネル）に連結されている。 The turbine 32 is connected to an exhaust line G3 for discharging the exhaust gas generated by rotating the turbine 32, and the exhaust line G3 is connected to a chimney (funnel) via an exhaust gas processing device (not shown).
　エアクーラ（冷却器）５２は、コンプレッサ３１により圧縮されて高温となった燃焼用ガスと冷却水とを熱交換することで、燃焼用ガスを冷却するものである。 The air cooler (cooler) 52 cools the combustion gas by exchanging heat between the combustion gas compressed by the compressor 31 and having a high temperature and the cooling water.
　ＥＧＲシステム１３は、排ガス再循環ラインＧ４、Ｇ５、Ｇ７と、スクラバ４２と、デミスタユニット４９と、ＥＧＲブロワ（送風機）５０と、パージ装置と、制御装置６０を備えている。ＥＧＲシステム１３は、エンジン本体１１から排出された排ガスの一部を空気と混合した後、過給機１２により圧縮して燃焼用ガスとしてエンジン本体１１に再循環するとき、この再循環する排ガスから有害物質を除去するものである。ＥＧＲシステム１３は、排気ラインＧ３から給気ラインＧ１までの間をバイパスするように設けられている。 The EGR system 13 includes exhaust gas recirculation lines G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower (blower) 50, a purge device, and a control device 60. The EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances. The EGR system 13 is provided to bypass from the exhaust line G3 to the air supply line G1.
　即ち、排ガス再循環ライン（第１ライン）Ｇ４は、一端部が排気ラインＧ３の中途部に接続されると共に、他端部がスクラバ４２に連結されている。排ガス再循環ラインＧ４は、ＥＧＲ入口バルブ（開閉弁）４１を備えている。ＥＧＲ入口バルブ４１は、排ガス再循環ラインＧ４を開閉することで、排気ラインＧ３から排ガス再循環ラインＧ４に分流する排ガスをＯＮ／ＯＦＦする。なお、ＥＧＲ入口バルブ４１を流量調整弁とし、排ガス再循環ラインＧ４を通過する排ガスの流量を調整するようにしてもよい。 That is, one end of the exhaust gas recirculation line (first line) G4 is connected to the middle of the exhaust line G3, and the other end is connected to the scrubber 42. The exhaust gas recirculation line G4 is provided with an EGR inlet valve (opening / closing valve) 41. The EGR inlet valve 41 opens / closes the exhaust gas branched from the exhaust line G3 to the exhaust gas recirculation line G4 by opening and closing the exhaust gas recirculation line G4. The EGR inlet valve 41 may be used as a flow rate adjusting valve to adjust the flow rate of the exhaust gas passing through the exhaust gas recirculation line G4.
　スクラバ４２は、排ガスに対して水を噴射することで、含有するＳＯｘや煤塵など微粒子（ＰＭ）といった有害物質を除去するものである。スクラバ４２は、中空形状をなすスロート部４３と、排ガスが導入されるベンチュリ部４４と、元の流速に段階的に戻す拡大部４５とを備えている。スクラバ４２は、ベンチュリ部４４に導入された排ガスに対して水を噴射する水噴射部４６を備えている。そして、スクラバ４２は、有害物質が除去された排ガスおよび排水を排出する排ガス再循環ラインＧ５が連結されている。なお、本実施形態では、ベンチュリ式を採用しているが、この構成に限定されるものではない。 The scrubber 42 removes harmful substances such as particulates (PM) such as SOx and dust contained therein by injecting water to the exhaust gas. The scrubber 42 includes a hollow throat 43, a venturi 44 into which exhaust gas is introduced, and an enlargement 45 that gradually returns to the original flow velocity. The scrubber 42 includes a water injection unit 46 that injects water to the exhaust gas introduced into the venturi unit 44. The scrubber 42 is connected to an exhaust gas recirculation line G5 for discharging the exhaust gas from which harmful substances have been removed and the waste water. Although the Venturi type is adopted in the present embodiment, the present invention is not limited to this configuration.
　排ガス再循環ライン（第２ライン）Ｇ５は、一端部がスクラバ４２に接続されると共に、他端部がＥＧＲブロワ（送風機）５０に連結されている。排ガス再循環ラインＧ５の経路には、デミスタユニット４９が配置されている。 The exhaust gas recirculation line (second line) G <b> 5 has one end connected to the scrubber 42 and the other end connected to the EGR blower (blower) 50. A demister unit 49 is disposed in the path of the exhaust gas recirculation line G5.
　デミスタユニット４９は、水噴射により有害物質が除去された排ガスと排水を分離するものである。デミスタユニット４９は、排水をスクラバ４２の水噴射部４６に循環する排水循環ラインＷ１が設けられている。そして、この排水循環ラインＷ１は、排水を一時的に貯留するホールドタンク４８と、ポンプ５０が設けられている。 The demister unit 49 separates the waste gas and the waste gas from which harmful substances have been removed by water injection. The demister unit 49 is provided with a drainage circulation line W1 that circulates the drainage to the water injection unit 46 of the scrubber 42. The drainage circulation line W1 is provided with a hold tank 48 for temporarily storing drainage and a pump 50.
　ＥＧＲブロワ５０は、スクラバ４２内の排ガスを排ガス再循環ラインＧ５からデミスタユニット４９に導くものであり、電動モータにより駆動する。 The EGR blower 50 guides the exhaust gas in the scrubber 42 from the exhaust gas recirculation line G5 to the demister unit 49, and is driven by an electric motor.
　排ガス再循環ライン（第３ライン）Ｇ７は、一端部がＥＧＲブロワ５０に接続されると共に、他端部が混合器（図示せず）を介してコンプレッサ３１に連結されており。ＥＧＲブロワ５０により排ガスがコンプレッサ３１に送られる。また、排ガス再循環ラインＧ７は、ＥＧＲ出口バルブ（開閉弁または流量調整弁）５１を備えている。 The exhaust gas recirculation line (third line) G7 has one end connected to the EGR blower 50 and the other end connected to the compressor 31 via a mixer (not shown). Exhaust gas is sent to the compressor 31 by the EGR blower 50. Further, the exhaust gas recirculation line G7 is provided with an EGR outlet valve (on-off valve or flow control valve) 51.
　本実施形態のパージ装置は、パージガス供給ラインＧ１１と、パージバルブ６１を備えている。この場合、排ガス再循環ラインＧ４、Ｇ５、Ｇ７および給気ラインＧ１が第１パージガス排出ラインとして機能する。パージ装置は、パージガス供給ラインＧ１１からパージガスを供給し、排ガス再循環ラインＧ７から腐食成分とともにパージガスを排出する。本実施形態にて、排ガス再循環ラインＧ４、Ｇ５、Ｇ７は、給気ラインＧ１を介してエンジン本体１１に連結されている。 The purge apparatus of the present embodiment includes a purge gas supply line G11 and a purge valve 61. In this case, the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1 function as a first purge gas discharge line. The purge device supplies the purge gas from the purge gas supply line G11, and discharges the purge gas together with the corrosive components from the exhaust gas recirculation line G7. In the present embodiment, the exhaust gas recirculation lines G4, G5, G7 are connected to the engine body 11 via the air supply line G1.
　パージガス供給ラインＧ１１は、一端部が大気に開放され、他端部が排ガス再循環ラインＧ４の中途部に連通している。より具体的には、パージガス供給ラインＧ１１の他端部は、ＥＧＲ入口バルブ４１とスクラバ４２との間の排ガス再循環ラインＧ４の中途部に接続されている。なお、パージガス供給ラインＧ１１は、一端部は圧縮空気供給源が接続されていても良い。圧縮空気供給源は、例えば、圧縮機と蓄圧タンクなどから構成されており、圧縮機により生成した圧縮空気を蓄圧タンクに溜めているものであり、船内で使用する各種機器に対して圧縮空気を供給することができる。この場合、ＥＧＲブロワ５０を駆動させることなく、パージガスを排ガス再循環ラインＧ４、Ｇ５、Ｇ７に供給することができる。 One end of the purge gas supply line G11 is open to the atmosphere, and the other end is in communication with the middle of the exhaust gas recirculation line G4. More specifically, the other end of the purge gas supply line G11 is connected to the middle of the exhaust gas recirculation line G4 between the EGR inlet valve 41 and the scrubber 42. A compressed air supply source may be connected to one end of the purge gas supply line G11. The compressed air supply source includes, for example, a compressor and a pressure accumulation tank, and the compressed air generated by the compressor is stored in the pressure accumulation tank, and the compressed air is supplied to various devices used in the ship. Can be supplied. In this case, the purge gas can be supplied to the exhaust gas recirculation lines G4, G5, G7 without driving the EGR blower 50.
　パージバルブ６１は、パージガス供給ラインＧ１１を開閉可能となっている。そのため、ＥＧＲ入口バルブ４１を閉止し、パージバルブ６１を開放すると、パージガスとしての外気（空気）をパージガス供給ラインＧ１１の一端部から吸入し、このパージガス供給ラインＧ１１を通して排ガス再循環ラインＧ４に供給することができる。 The purge valve 61 can open and close the purge gas supply line G11. Therefore, closing the EGR inlet valve 41 and opening the purge valve 61 sucks outside air (air) as purge gas from one end of the purge gas supply line G11 and supplies it to the exhaust gas recirculation line G4 through the purge gas supply line G11. Can.
　制御装置６０は、船舶の運航状態（運航海域）に応じてＥＧＲ入口バルブ４１、ＥＧＲ出口バルブ５１、パージバルブ６１を開閉制御可能であると共に、ＥＧＲブロワ５０を駆動制御可能である。 The control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, and the purge valve 61 in accordance with the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50.
　制御装置６０は、船舶の運航状態（運航海域）に応じてＥＧＲ入口バルブ４１、ＥＧＲ出口バルブ５１、パージバルブ６１を開閉制御可能であると共に、ＥＧＲブロワ５０を駆動制御可能である。即ち、制御装置６０は、現在の船舶の運航海域がＮＯｘの排出量を規制するＥＣＡ（ＮＯｘ規制海域）外であれば、ＥＧＲ運転開始信号Ｓ１の入力がなく、ＥＧＲ入口バルブ４１、ＥＧＲ出口バルブ５１、パージバルブ６１を閉止すると共に、ＥＧＲブロワ５０の駆動を停止する。すると、エンジン本体１１からの排ガスは、全量が排気ラインＧ３から外部に排出される。 The control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, and the purge valve 61 in accordance with the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50. That is, the control device 60 does not receive the EGR operation start signal S1 if the current operation area of the ship is outside the ECA (NOx control area) that regulates the emission of NOx, and the EGR inlet valve 41 and the EGR outlet valve 51, the purge valve 61 is closed and the driving of the EGR blower 50 is stopped. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3.
　一方、制御装置６０は、現在の船舶の運航海域がＮＯｘの排出量を規制するＥＣＡ（ＮＯｘ規制海域）内であれば、ＥＧＲ運転開始信号Ｓ１が入力され、ＥＧＲ入口バルブ４１、ＥＧＲ出口バルブ５１を開放すると共に、ＥＧＲブロワ５０を駆動する。すると、エンジン本体１１から排出された排ガスは、一部が排気ラインＧ３から排ガス再循環ラインＧ４、Ｇ５、Ｇ７に供給される。 On the other hand, if the current operation area of the ship is within the ECA (NOx control area) which regulates the emission of NOx, the control device 60 receives the EGR operation start signal S1 and the EGR inlet valve 41 and the EGR outlet valve 51 As well as driving the EGR blower 50. Then, a part of the exhaust gas discharged from the engine body 11 is supplied from the exhaust line G3 to the exhaust gas recirculation lines G4, G5, G7.
　そして、制御装置６０は、現在の船舶の運航海域がＥＣＡ内からＥＣＡ外に移動すると、ＥＧＲ運転停止信号Ｓ２が入力され、ＥＧＲブロワ５０の回転数を低下させる。その後、ＥＧＲ入口バルブ４１を閉止し、パージバルブ６１を開放させる。すると、エンジン本体１１からの排ガスは、全量が排気ラインＧ３から外部に排出される。また、パージガス供給ラインＧ１１から排ガス再循環ラインＧ４に供給された空気は、この排ガス再循環ラインＧ４、Ｇ５、Ｇ７、給気ラインＧ１を通してエンジン本体１１の掃気トランク２２に送給される。 Then, when the current operation area of the ship moves from the inside of the ECA to the outside of the ECA, the control device 60 receives the EGR operation stop signal S2 and reduces the rotational speed of the EGR blower 50. Thereafter, the EGR inlet valve 41 is closed and the purge valve 61 is opened. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, the air supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is supplied to the scavenging trunk 22 of the engine body 11 through the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1.
　以下、第１実施形態のＥＧＲシステムの作用を説明する。エンジン本体１１は、掃気トランク２２からシリンダ２１内に燃焼用空気が供給されると、ピストンによってこの燃焼用空気が圧縮され、この高温の空気に対して燃料が噴射されることで自然着火し、燃焼する。そして、発生した燃焼ガスは、排ガスとして排気マニホールド２３から排気ラインＧ２に排出される。エンジン本体１１から排出された排ガスは、過給機１２におけるタービン３２を回転した後、排気ラインＧ３に排出され、ＥＧＲ入口バルブ４１が閉止しているときは、全量が排気ラインＧ３から外部に排出される。 Hereinafter, the operation of the EGR system of the first embodiment will be described. When the combustion air is supplied from the scavenging air trunk 22 into the cylinder 21 from the scavenging air trunk 22, the combustion air is compressed by the piston, and the fuel is injected to the high-temperature air to cause natural ignition. To burn. Then, the generated combustion gas is discharged from the exhaust manifold 23 to the exhaust line G2 as an exhaust gas. The exhaust gas discharged from the engine body 11 is discharged to the exhaust line G3 after rotating the turbine 32 in the turbocharger 12. When the EGR inlet valve 41 is closed, the entire amount is discharged to the outside from the exhaust line G3. Be done.
　一方、ＥＧＲ入口バルブ４１及びＥＧＲ出口バルブ５１が開放しているとき、排ガスは、その一部が排気ラインＧ３から排ガス再循環ラインＧ４に流れる。排ガス再循環ラインＧ４に流れた排ガスは、スクラバ４２により、有害物質が除去される。即ち、スクラバ４２は、排ガスがベンチュリ部４４を高速で通過するとき、水噴射部４６から水を噴射することで、この水により排ガスを冷却すると共に、有害物質を水と共に落下させて除去する。 On the other hand, when the EGR inlet valve 41 and the EGR outlet valve 51 are open, a part of the exhaust gas flows from the exhaust line G3 to the exhaust gas recirculation line G4. A scrubber 42 removes harmful substances from the exhaust gas that has flowed into the exhaust gas recirculation line G4. That is, when the exhaust gas passes through the venturi section 44 at high speed, the scrubber 42 injects water from the water injection section 46, thereby cooling the exhaust gas with this water and dropping harmful substances together with the water to remove it.
　スクラバ４２により有害物質が除去された排ガスは、排ガス再循環ラインＧ５に排出され、デミスタユニット４９により排ガスと排水が分離された後、ＥＧＲブロワ５０および排ガス再循環ラインＧ７を介して過給機１２に送られる。そして、この排ガスは、吸入ラインＧ６から吸入された空気と混合されて燃焼用ガスとなり、過給機１２のコンプレッサ３１で圧縮された後、エアクーラ５２で冷却され、給気ラインＧ１からエンジン本体１１に供給される。 The exhaust gas from which harmful substances have been removed by the scrubber 42 is discharged to the exhaust gas recirculation line G5, and after the exhaust gas and the drainage are separated by the demister unit 49, the turbocharger 12 is connected via the EGR blower 50 and the exhaust gas recirculation line G7. Sent to Then, this exhaust gas is mixed with the air taken in from the suction line G6 to become a combustion gas, compressed by the compressor 31 of the turbocharger 12, and then cooled by the air cooler 52, and from the air supply line G1 to the engine main body 11 Supplied to
　ここで、ＥＧＲシステムにおける排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ制御について説明する。図２は、ＥＧＲシステムにおけるＥＧＲ運転停止時のパージ制御を表すフローチャート、図３は、船舶の入港時におけるＥＧＲシステムの作動を表すフローチャート、図４は、船舶の出港時におけるＥＧＲシステムの作動を表すフローチャート、図５は、パージ時間に対する排気ガス再循環ラインのＳＯ２濃度を表すグラフ、図６は、パージ時間に対する排気ガス再循環ラインのＳＯ２濃度の詳細を表すグラフである。 Here, purge control of the exhaust gas recirculation lines G4, G5, G7 in the EGR system will be described. FIG. 2 is a flow chart showing the purge control at the time of EGR operation stop in the EGR system, FIG. 3 is a flow chart showing the operation of the EGR system at the time of entry of the ship, and FIG. 4 shows the action of the EGR system at the departure of the ship flowchart, Fig. 5 is a graph representing the SO 2 concentration in the exhaust gas recirculation line for the purge time, FIG. 6 is a graph showing the details of the SO 2 concentration in the exhaust gas recirculation line for purge time.
　ＥＧＲ運転停止時のパージ制御について、図１及び図２に示すように、ステップＳ１１にて、制御装置６０は、ＥＧＲ運転停止信号Ｓ２が入力されると、ＥＧＲ運転停止シーケンスが開始され、ステップＳ１２にて、ＥＧＲブロワ５０の回転数を減少させ、ステップＳ１３にて、ＥＧＲブロワ５０の回転数が予め設定された回転数以下になったかどうかを判定する。ここで、ＥＧＲブロワ５０の回転数が設定回転数以下になるまで待機し、ＥＧＲブロワ５０の回転数が設定回転数以下になったら、ステップＳ１６に移行する。また、ステップＳ１４にて、ＥＧＲ入口バルブ４１の閉動作を開始し、ステップＳ１５にて、ＥＧＲ入口バルブ４１の開度が予め設定された開度以下になったかどうかを判定する。ここで、ＥＧＲ入口バルブ４１の開度が設定開度以下になるまで待機し、ＥＧＲ入口バルブ４１の開度が設定開度以下になったら、ＥＧＲ入口バルブ４１の開度を微開状態に維持し、ステップＳ１６に移行する。 Regarding purge control at the time of EGR operation stop, as shown in FIG. 1 and FIG. 2, when the EGR operation stop signal S2 is input in step S11, the control device 60 starts the EGR operation stop sequence, and step S12 Then, the rotational speed of the EGR blower 50 is decreased, and in step S13, it is determined whether the rotational speed of the EGR blower 50 has become equal to or less than a preset rotational speed. Here, the process waits until the rotational speed of the EGR blower 50 becomes equal to or less than the set rotational speed, and when the rotational speed of the EGR blower 50 becomes equal to or less than the set rotational speed, the process proceeds to step S16. In step S14, the closing operation of the EGR inlet valve 41 is started, and in step S15, it is determined whether the opening degree of the EGR inlet valve 41 has become equal to or less than a preset opening degree. Here, the process waits until the degree of opening of the EGR inlet valve 41 becomes less than the set degree of opening, and maintains the degree of opening of the EGR inlet valve 41 in a slightly open state when the degree of opening of the EGR inlet valve 41 becomes less than the set degree of opening. Then, the process proceeds to step S16.
　制御装置６０は、ステップＳ１６にて、パージバルブ６１の開動作を開始し、ステップＳ１７にて、パージバルブ６１の開度が全開になったかどうかを判定する。ここで、パージバルブ６１の開度が全開になるまで待機し、パージバルブ６１の開度が全開になったら、ステップＳ１８にて、ＥＧＲ入口バルブ４１の閉動作を再開し、ステップＳ１９にて、ＥＧＲ入口バルブ４１の開度が予め設定された開度（ほぼ全閉）以下になったかどうかを判定する。ここで、ＥＧＲ入口バルブ４１の開度が全閉になるまで待機し、ＥＧＲ入口バルブ４１の開度が全閉になったら、ステップＳ２０にて、排ガス再循環ラインＧ４のパージ処理を予め設定された規定時間だけ実行する。 In step S16, the control device 60 starts the opening operation of the purge valve 61, and in step S17, determines whether the opening degree of the purge valve 61 is fully opened. Here, the operation waits until the opening degree of the purge valve 61 is fully opened, and when the opening degree of the purge valve 61 is fully opened, the closing operation of the EGR inlet valve 41 is resumed in step S18, and the EGR inlet in step S19. It is determined whether or not the opening degree of the valve 41 has become equal to or less than a preset opening degree (almost fully closed). Here, the process waits until the opening degree of the EGR inlet valve 41 is fully closed, and when the opening degree of the EGR inlet valve 41 is fully closed, the purge process of the exhaust gas recirculation line G4 is preset in step S20. Run for the specified time.
　即ち、排ガス再循環ラインＧ４、Ｇ５、Ｇ７、コンプレッサ３１および給気ラインＧ１を介してエンジン本体１１の掃気トランク２２に連通されている。また、排ガス再循環ラインＧ４、Ｇ５、Ｇ７の途中には、ＥＧＲブロワ５０が設けられていることから、ＥＧＲブロワ５０を駆動することで、掃気トランク２２側へのガス流れが作用する。そのため、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留していた腐食成分は、この空気により除去され、腐食成分を含むパージガスが掃気トランク２２に送り込まれる。 That is, the exhaust gas recirculation lines G4, G5, G7, the compressor 31, and the air supply line G1 communicate with the scavenge air trunk 22 of the engine body 11. Further, since the EGR blower 50 is provided in the middle of the exhaust gas recirculation lines G4, G5, G7, the gas flow to the scavenging trunk 22 side acts by driving the EGR blower 50. Therefore, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are removed by the air, and the purge gas containing the corrosive components is sent to the scavenging trunk 22.
　制御装置６０は、ステップＳ２１にて、ＥＧＲ入口バルブ４１の開度が全閉したと判定されてから規定時間が経過したかどうかを判定する。ここで、規定時間が経過するまで排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理を実行する。この排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理時間は、予め設定されている。例えば、パージ処理を実行する機器や配管のボリューム（容積）をＶｍ３、単位時間当たりにパージガス供給ラインＧ１１に取り込まれた空気量をＶｐｍ３／ｍｉｎ、パージ領域における腐食成分濃度をＸ０ｐｐｍ、パージ時間をＴとすると、Ｔ分後のパージ領域の平均濃度Ｘｔを下記数式により求めることができる。
　　Ｘｔ＋１＝｛（ＸｔＶ）－（ＸｔＶｐ）｝／Ｖ The control device 60 determines whether or not a specified time has elapsed since it was determined in step S21 that the degree of opening of the EGR inlet valve 41 is fully closed. Here, the purge process of the exhaust gas recirculation lines G4, G5, G7 is executed until the specified time has elapsed. The purge processing time of the exhaust gas recirculation lines G4, G5, G7 is set in advance. For example, the volume (volume) of the equipment or piping that executes the purge process is Vm 3 , the amount of air taken into the purge gas supply line G11 per unit time is V p m 3 / min, the concentration of corrosive components in the purge region is X 0 ppm, the purge time when is T, it is possible to determine the average density X t of the purge region after T minutes by the following equation.
X t + 1 = {(X t V)-(X t V p )} / V
　この算出方法に基づいて作成したものが図５及び図６に表すグラフである。図６は、図５の部分拡大図である。図５に示すように、パージ時間が５分になると、排ガス再循環ラインＧ４、Ｇ５、Ｇ７における腐食成分濃度が規定値位まで低下し、図６に示すように、パージ時間が１０分になると、排ガス再循環ラインＧ４、Ｇ５、Ｇ７における腐食成分濃度がほぼ０ｐｐｍまで低下する。 What is created based on this calculation method is a graph shown in FIG. 5 and FIG. FIG. 6 is a partial enlarged view of FIG. As shown in FIG. 5, when the purge time is 5 minutes, the concentration of corrosive components in the exhaust gas recirculation lines G4, G5, G7 decreases to the specified value, and as shown in FIG. The concentration of corrosive components in the exhaust gas recirculation lines G4, G5 and G7 is reduced to almost 0 ppm.
　図１及び図２に戻り、ステップＳ２１にて、ＥＧＲ入口バルブ４１の開度が全閉したと判定されてから規定時間が経過したら、ステップＳ２２にて、ＥＧＲブロワ５０の運転を停止する。続いて、ステップＳ２３にて、パージバルブ６１を閉止し、ステップＳ２４にて、ＥＧＲ出口バルブ５１を閉止し、ステップＳ２５にて、排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理が完了する。 Referring back to FIG. 1 and FIG. 2, when it is determined in step S21 that the opening degree of the EGR inlet valve 41 is fully closed and the specified time has elapsed, the operation of the EGR blower 50 is stopped in step S22. Subsequently, in step S23, the purge valve 61 is closed, and in step S24, the EGR outlet valve 51 is closed. In step S25, the purge process of the exhaust gas recirculation lines G4, G5, G7 is completed.
　また、上述した排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理中にエンジン本体１１の運転が停止すると、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留していた腐食成分を含むパージガスを掃気トランク２２に送り込むことが困難となる。このため、本実施形態では入港前の段階（例えば、エンジン運転モードを港湾外航行モードから港湾内航行モード（フル・アヘッド（Full　Ahead：港内速力での前進全速回転数））に切り換える段階）でＥＧＲ運転を停止する。ＥＧＲ運転停止後は、上述のＥＧＲ運転停止時のパージ制御を実行する。 In addition, when the operation of the engine main body 11 is stopped during the purge process of the exhaust gas recirculation lines G4, G5, G7 described above, the purge gas containing the corrosive component remaining in the exhaust gas recirculation lines G4, G5, G7 is scavenged It is difficult to feed Therefore, in the present embodiment, the stage before entering the port (for example, the stage of switching the engine operation mode from the out-of-port navigation mode to the in-port navigation mode (Full Ahead: full forward speed at harbor speed)). Stop the EGR operation. After the EGR operation is stopped, the above-described purge control at the time of the EGR operation stop is executed.
　第１実施形態のＥＧＲシステムは、図３に示すように、入港前にＥＣＡ（内でＥＧＲ運転を停止する。このため、パージ装置として、パージガス供給ラインＧ１１と、パージバルブ６１とを備えるだけで、排ガス再循環ラインＧ４、Ｇ５、Ｇ７から腐食成分を排出することができる。一方、出港時は、図４に示すように、ＥＣＡ外でＥＧＲ運転を停止し、パージを行う。 The EGR system according to the first embodiment, as shown in FIG. 3, stops the EGR operation in the ECA before entering the port. Therefore, only by providing the purge gas supply line G11 and the purge valve 61 as a purge device, The corrosive components can be discharged from the exhaust gas recirculation lines G4, G5, G 7. On the other hand, at the time of leaving the port, the EGR operation is stopped outside the ECA and purging is performed as shown in FIG.
　このように第１実施形態のＥＧＲシステムにあっては、エンジン本体１１から排出された排ガスの一部を燃焼用ガスの一部としてエンジン本体１１に再循環する排ガス再循環ラインＧ４、Ｇ５、Ｇ７と、排ガス再循環ラインＧ４に設けられるＥＧＲ入口バルブ４１と、排ガス再循環ラインＧ４、Ｇ５、Ｇ７にパージガスを供給して残留する腐食成分を排出するパージ装置としてのパージガス供給ラインＧ１１とを設けている。 As described above, in the EGR system of the first embodiment, the exhaust gas recirculation lines G4, G5, G7 recirculate a part of the exhaust gas discharged from the engine body 11 to the engine body 11 as a part of the combustion gas. And an EGR inlet valve 41 provided in the exhaust gas recirculation line G4, and a purge gas supply line G11 as a purge device for supplying the purge gas to the exhaust gas recirculation lines G4, G5, G7 and discharging remaining corrosive components. There is.
　従って、ＥＧＲ入口バルブ４１が開放されると、エンジン本体１１から排出された排ガスの一部が排ガス再循環ラインＧ４に供給され、スクラバ４２により排ガスから有害物質（ＳＯｘや煤塵）が除去された後にエンジン本体１１に再循環される。その後、ＥＧＲ入口バルブ４１が閉止されると、排ガス再循環ラインＧ４、Ｇ５、Ｇ７にスクラバ４２で除去されなかったまたは除去することができない腐食成分（ＳＯｘおよびＮＯｘ）が残留する。このとき、パージ装置がパージガス供給ラインＧ１１から排ガス再循環ラインＧ４、Ｇ５、Ｇ７にパージガスを供給すると、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留した腐食成分がパージガスと共に排出される。そのため、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留する腐食成分を除去することで、排ガス再循環ラインＧ４、Ｇ５、Ｇ７を構成する配管の腐食を抑制することができる。 Therefore, after the EGR inlet valve 41 is opened, a part of the exhaust gas discharged from the engine body 11 is supplied to the exhaust gas recirculation line G4, and after the scrubber 42 removes harmful substances (SOx and dust) from the exhaust gas. It is recirculated to the engine body 11. Thereafter, when the EGR inlet valve 41 is closed, corrosive components (SOx and NOx) which are not removed or can not be removed by the scrubber 42 remain in the exhaust gas recirculation lines G4, G5, G7. At this time, when the purge device supplies the purge gas from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are discharged together with the purge gas. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7 can be suppressed.
　第１実施形態のＥＧＲシステムでは、パージ装置として、パージガス供給ラインＧ１１と、パージバルブ６１を備えている。この場合、排ガス再循環ラインＧ４、Ｇ５、Ｇ７がパージガス排出ラインとして機能する。 In the EGR system of the first embodiment, a purge gas supply line G11 and a purge valve 61 are provided as a purge device. In this case, the exhaust gas recirculation lines G4, G5, G7 function as purge gas discharge lines.
　従って、パージガス供給ラインＧ１１からパージガスを排ガス再循環ラインＧ４に供給し、排ガス再循環ラインＧ４、Ｇ５、Ｇ７からパージガスとともに腐食成分を排出することができる。即ち、パージガスの供給と腐食成分の排出を適正に実施することができる。 Therefore, the purge gas can be supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4, and the corrosive components can be discharged together with the purge gas from the exhaust gas recirculation lines G4, G5, G7. That is, the supply of the purge gas and the discharge of the corrosive component can be properly performed.
　第１実施形態のＥＧＲシステムでは、パージ装置は、外気（空気）をパージガスとしてパージガス供給ラインＧ１１から排ガス再循環ラインＧ４、Ｇ５、Ｇ７に供給する。従って、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に空気を供給して残留する腐食成分を排出することから、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に腐食成分を残留させることなく、パージ処理することができ、また、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に一端部が大気に開放されたパージガス供給ラインＧ１１を連結するだけでよく、パージ装置の配管系を簡素化することができる。 In the EGR system of the first embodiment, the purge device supplies outside air (air) as a purge gas from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7. Therefore, since air is supplied to the exhaust gas recirculation lines G4, G5, G7 to discharge the remaining corrosive components, it is possible to purge without leaving any corrosive components in the exhaust gas recirculation lines G4, G5, G7. The exhaust gas recirculation lines G4, G5, and G7 may be connected to the purge gas supply line G11 whose one end is open to the atmosphere, and the piping system of the purge device can be simplified.
　第１実施形態のＥＧＲシステムでは、パージ装置として、排ガス再循環ラインＧ４におけるＥＧＲ入口バルブ４１とスクラバ４２との間に連結されるパージガス供給ラインＧ１１と、パージガス供給ラインＧ１１を開閉するパージバルブ６１とを設けている。従って、ＥＧＲ入口バルブ４１が閉止されると、パージバルブ６１を開放することで、パージガスがパージガス供給ラインＧ１１から排ガス再循環ラインＧ４、Ｇ５、Ｇ７に供給されることとなり、スクラバ４２、デミスタユニット４９およびＥＧＲブロワ５０を含む排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留する腐食成分を除去することができ、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留する腐食成分を適正に除去することができる。 In the EGR system of the first embodiment, as a purge device, there are a purge gas supply line G11 connected between the EGR inlet valve 41 and the scrubber 42 in the exhaust gas recirculation line G4, and a purge valve 61 for opening and closing the purge gas supply line G11. It is provided. Therefore, when the EGR inlet valve 41 is closed, the purge gas is supplied from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7 by opening the purge valve 61, and the scrubber 42, the demister unit 49 and Corrosion components remaining in the exhaust gas recirculation lines G4, G5, G7 including the EGR blower 50 can be removed, and corrosion components remaining in the exhaust gas recirculation lines G4, G5, G7 can be properly removed.
　第１実施形態のＥＧＲシステムでは、パージ装置は、パージガス供給ラインＧ１１からのパージガスを排ガス再循環ラインＧ４、Ｇ５、Ｇ７からエンジン本体１１に送給する。従って、腐食成分をエンジン本体１１で処理することができると共に、エンジン本体１１からの排ガスを処理することで、外部への放出を抑制することができる。 In the EGR system of the first embodiment, the purge device supplies the purge gas from the purge gas supply line G11 to the engine body 11 from the exhaust gas recirculation lines G4, G5, G7. Therefore, while being able to process a corrosive component with engine main part 11, by processing exhaust gas from engine main part 11, discharge to the exterior can be controlled.
　第１実施形態のＥＧＲシステムでは、ＥＧＲ運転停止信号Ｓ２が入力したときにＥＧＲ入口バルブ４１を閉止してパージバルブ６１を所定期間だけ開放する制御装置６０を設けている。従って、ＥＧＲ運転が停止すると、パージガスがパージガス供給ラインＧ１１から排ガス再循環ラインＧ４、Ｇ５、Ｇ７に供給されることとなり、パージガスにより早期に排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留する腐食成分を除去することができる。 The EGR system according to the first embodiment is provided with a control device 60 that closes the EGR inlet valve 41 and opens the purge valve 61 for a predetermined period when the EGR operation stop signal S2 is input. Therefore, when the EGR operation is stopped, the purge gas is supplied from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7, and corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 at an early stage by the purge gas are It can be removed.
　第１実施形態のＥＧＲシステムでは、入港前にＥＧＲ運転を停止したのちにパージバルブ６１を所定期間だけ開放し、その後エンジン運転を停止する。従って、ＥＧＲ運転が停止し、エンジン本体１１の運転が停止する前にパージガスがパージガス供給ラインＧ１１から排ガス再循環ラインＧ４、Ｇ５、Ｇ７に供給されることとなり、パージガスにより早期に排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留する腐食成分を除去することができる。 In the EGR system of the first embodiment, after stopping the EGR operation before entering the port, the purge valve 61 is opened for a predetermined period, and then the engine operation is stopped. Accordingly, the purge gas is supplied from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7 before the EGR operation is stopped and the operation of the engine main body 11 is stopped. , G5, and G7 can be removed.
［第２実施形態］
　図７は、第２実施形態のＥＧＲシステムを表す概略構成図である。なお、上述した実施形態と同様の機能を有する部材には、同一の符号を付して詳細な説明は省略する。 Second Embodiment
FIG. 7 is a schematic block diagram showing the EGR system of the second embodiment. The members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
　第２実施形態のパージ装置は、図７に示すように、パージガス供給ラインＧ１１と、パージバルブ６１と、パージガス排出ラインＧ１２と、排気バルブ６２とを備えている。この場合、排ガス再循環ラインＧ７が第１パージガス排出ラインとして機能し、パージガス排出ラインＧ１２が第２パージガス排出ラインとして機能する。パージ装置は、パージガス供給ラインＧ１１からパージガスを供給し、排ガス再循環ラインＧ７またはパージガス排出ラインＧ１２からパージガスと腐食成分を排出する。 The purge apparatus according to the second embodiment, as shown in FIG. 7, includes a purge gas supply line G11, a purge valve 61, a purge gas discharge line G12, and an exhaust valve 62. In this case, the exhaust gas recirculation line G7 functions as a first purge gas discharge line, and the purge gas discharge line G12 functions as a second purge gas discharge line. The purge device supplies a purge gas from a purge gas supply line G11, and discharges a purge gas and a corrosive component from an exhaust gas recirculation line G7 or a purge gas discharge line G12.
　パージガス排出ラインＧ１２は、一端部が排ガス再循環ラインＧ７の中途部に接続され、他端部が排気ラインＧ３の中途部に連結されている。より具体的には、パージガス排出ラインＧ１２の一端部は、ＥＧＲブロワ５０の出口とＥＧＲ出口バルブ（流量制御弁）５１との間の排ガス再循環ラインＧ７の中途部に接続され、他端部がタービン３２の出口と、排気ラインＧ３と排ガス再循環ラインＧ４との接続部との間に接続される。 One end of the purge gas discharge line G12 is connected to the middle of the exhaust gas recirculation line G7, and the other end is connected to the middle of the exhaust line G3. More specifically, one end of the purge gas discharge line G12 is connected to the middle of the exhaust gas recirculation line G7 between the outlet of the EGR blower 50 and the EGR outlet valve (flow control valve) 51, and the other end is It is connected between the outlet of the turbine 32 and the connection between the exhaust line G3 and the exhaust gas recirculation line G4.
　排気バルブ６２は、パージガス排出ラインＧ１２を開閉可能となっている。そのため、ＥＧＲ出口バルブ（流量制御弁）５１を閉止し、排気バルブ６２を開放すると、ＥＧＲシステム１３の内部を流れるガスがパージガス排出ラインＧ１２を通して排気ラインＧ３に排出される。 The exhaust valve 62 can open and close the purge gas discharge line G12. Therefore, when the EGR outlet valve (flow control valve) 51 is closed and the exhaust valve 62 is opened, the gas flowing inside the EGR system 13 is exhausted to the exhaust line G3 through the purge gas exhaust line G12.
　制御装置６０は、船舶の運航状態（運航海域）に応じてＥＧＲ入口バルブ４１、ＥＧＲ出口バルブ５１、パージバルブ６１、排気バルブ６２を開閉制御可能であると共に、ＥＧＲブロワ５０を駆動制御可能である。 The control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, the purge valve 61, and the exhaust valve 62 according to the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50.
　制御装置６０は、船舶の運航状態（運航海域）に応じてＥＧＲ入口バルブ４１、ＥＧＲ出口バルブ５１、パージバルブ６１、排気バルブ６２を開閉制御可能であると共に、ＥＧＲブロワ５０を駆動制御可能である。即ち、制御装置６０は、現在の船舶の運航海域がＮＯｘの排出量を規制するＥＣＡ外であれば、ＥＧＲ運転開始信号Ｓ１の入力がなく、ＥＧＲ入口バルブ４１、ＥＧＲ出口バルブ５１、パージバルブ６１、排気バルブ６２を閉止すると共に、ＥＧＲブロワ５０の駆動を停止する。すると、エンジン本体１１からの排ガスは、全量が排気ラインＧ３から外部に排出される。 The control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, the purge valve 61, and the exhaust valve 62 according to the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50. That is, the control device 60 does not receive the EGR operation start signal S1 if the current operation area of the ship is outside the ECA that regulates the emission amount of NOx, and the EGR inlet valve 41, the EGR outlet valve 51, the purge valve 61, The exhaust valve 62 is closed and the driving of the EGR blower 50 is stopped. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3.
　一方、制御装置６０は、現在の船舶の運航海域がＮＯｘの排出量を規制するＥＣＡ内であれば、ＥＧＲ運転開始信号Ｓ１が入力され、ＥＧＲ入口バルブ４１、ＥＧＲ出口バルブ５１を開放すると共に、ＥＧＲブロワ５０を駆動する。すると、エンジン本体１１から排出された排ガスは、一部が排気ラインＧ３から排ガス再循環ラインＧ４、Ｇ５、Ｇ７に供給される。 On the other hand, when the current operation area of the ship is within the ECA that regulates the emission of NOx, the control device 60 receives the EGR operation start signal S1 and opens the EGR inlet valve 41 and the EGR outlet valve 51. The EGR blower 50 is driven. Then, a part of the exhaust gas discharged from the engine body 11 is supplied from the exhaust line G3 to the exhaust gas recirculation lines G4, G5, G7.
　そして、制御装置６０は、現在の船舶の運航海域がＥＣＡ内からＥＣＡ外に移動すると、ＥＧＲ運転停止信号Ｓ２が入力され、ＥＧＲブロワ５０の回転数を低下させる。その後、ＥＧＲ入口バルブ４１を閉止し、パージバルブ６１を開放させる。すると、エンジン本体１１からの排ガスは、全量が排気ラインＧ３から外部に排出される。また、パージガス供給ラインＧ１１から排ガス再循環ラインＧ４に供給された空気は、この排ガス再循環ラインＧ４、Ｇ５、Ｇ７、給気ラインＧ１を通してエンジン本体１１の掃気トランク２２に送給される。 Then, when the current operation area of the ship moves from the inside of the ECA to the outside of the ECA, the control device 60 receives the EGR operation stop signal S2 and reduces the rotational speed of the EGR blower 50. Thereafter, the EGR inlet valve 41 is closed and the purge valve 61 is opened. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, the air supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is supplied to the scavenging trunk 22 of the engine body 11 through the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1.
　また、制御装置６０は、ＥＧＲガスのパージ中に、何らかの原因でエンジン本体１１が停止すると、エンジン運転停止信号Ｓ３が入力され、ＥＧＲ出口バルブ５１を閉止し、排気バルブ６２を開放する。すると、パージガス供給ラインＧ１１から排ガス再循環ラインＧ４に供給された空気は、この排ガス再循環ラインＧ４からガス排出ラインＧ５、排ガス供給ラインＧ７、パージガス排出ラインＧ１２、排気ラインＧ３を通して外部に排出される。 Further, when the engine body 11 is stopped for some reason during the purge of the EGR gas, the control device 60 receives the engine operation stop signal S3, closes the EGR outlet valve 51, and opens the exhaust valve 62. Then, the air supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is discharged from the exhaust gas recirculation line G4 to the outside through the gas discharge line G5, the exhaust gas supply line G7, the purge gas discharge line G12, and the exhaust line G3. .
　以下、第２実施形態のＥＧＲシステムの作用を説明する。第２実施形態のＥＧＲシステムはエンジン本体１１の運転が停止した後であっても、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留していた腐食成分を除去できる点で第１実施形態のＥＧＲシステムと異なる。 Hereinafter, the operation of the EGR system of the second embodiment will be described. The EGR system according to the second embodiment can remove the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 even after the operation of the engine body 11 is stopped. It is different from
　ここで、ＥＧＲシステムにおける排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ制御について説明する。図８は、ＥＧＲシステムにおけるエンジン運転停止時のパージ制御を表すフローチャートで、図９は、船舶の入港時におけるＥＧＲシステムの作動を表すフローチャートである。 Here, purge control of the exhaust gas recirculation lines G4, G5, G7 in the EGR system will be described. FIG. 8 is a flow chart showing purge control at the time of engine operation stop in the EGR system, and FIG. 9 is a flow chart showing the operation of the EGR system at the time of entry of a ship.
　エンジン運転停止時のパージ制御について、図７及び図８に示すように、ステップＳ３１にて、制御装置６０は、排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理の実行中あるいはパージ処理の実行前に、エンジン運転停止信号（パージ処理開始信号）Ｓ３が入力されると、パージシーケンスが開始され、ステップＳ３２にて、パージバルブ６１の開動作を開始し、ステップＳ３３にて、パージバルブ６１の開度が全開になったかどうかを判定する。ここで、パージバルブ６１の開度が全開になるまで待機し、パージバルブ６１の開度が全開になったら、ステップＳ３４に移行する。なお、ステップＳ３２，Ｓ３３の処理は、排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理の実行中であれば、既にパージバルブ６１の開度が全開であり、そのままステップＳ３４に移行する。 Regarding purge control at the time of engine operation stop, as shown in FIG. 7 and FIG. 8, in step S31, the control device 60 is executing purge processing of the exhaust gas recirculation lines G4, G5, G7 or before execution of the purge processing. When the engine operation stop signal (purge process start signal) S3 is input, the purge sequence is started, and in step S32, the opening operation of the purge valve 61 is started, and in step S33, the opening degree of the purge valve 61 is Determine if it is fully open. Here, the process waits until the opening degree of the purge valve 61 is fully opened, and when the opening degree of the purge valve 61 is fully opened, the process proceeds to step S34. In the processes of steps S32 and S33, if the purge process of the exhaust gas recirculation lines G4, G5, and G7 is being performed, the opening degree of the purge valve 61 is already fully open, and the process directly proceeds to step S34.
　制御装置６０は、ステップＳ３４にて、排気バルブ６２の開動作を開始し、ステップＳ３５にて、排気バルブ６２の開度が全開になったかどうかを判定する。ここで、排気バルブ６２の開度が全開になるまで待機し、排気バルブ６２の開度が全開になったら、ステップＳ３６にて、ＥＧＲブロワ５０の回転数を予め設定された回転数まで減少させる。そして、ステップＳ３７にて、排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理を予め設定された規定時間だけ実行する。即ち、排ガス再循環ラインＧ４、Ｇ５、Ｇ７は、ＥＧＲブロワ５０が駆動し、排気バルブ６２が開放されていることから、排気ラインＧ３側へのガス流れが生じており、パージガス供給ラインＧ１１から取り込まれた空気は、排ガス再循環ラインＧ４、Ｇ５、Ｇ７、パージガス排出ラインＧ１２、排気ラインＧ３を通して外部に排出される。 In step S34, the control device 60 starts the opening operation of the exhaust valve 62, and determines in step S35 whether or not the opening degree of the exhaust valve 62 is fully open. Here, the process waits until the opening degree of the exhaust valve 62 is fully opened, and when the opening degree of the exhaust valve 62 is fully opened, the number of rotations of the EGR blower 50 is reduced to a preset number of rotations in step S36. . Then, in step S37, the purge process of the exhaust gas recirculation lines G4, G5, and G7 is performed for a predetermined time set in advance. That is, since the EGR blower 50 is driven and the exhaust valve 62 is opened, the exhaust gas recirculation lines G4, G5 and G7 generate a gas flow to the exhaust line G3 side, and are taken from the purge gas supply line G11. The exhausted air is exhausted to the outside through the exhaust gas recirculation lines G4, G5, G7, the purge gas exhaust line G12, and the exhaust line G3.
　制御装置６０は、ステップＳ３８にて、ＥＧＲブロワ５０の回転数を減少させてから規定時間が経過したかどうかを判定する。ここで、規定時間が経過するまで排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理を実行し、規定時間が経過したら、ステップＳ３９にて、ＥＧＲブロワ５０の運転を停止し、ステップＳ４０にて、パージバルブ６１を閉止し、ステップＳ４１にて、排気バルブ６２を閉止し、ステップＳ４２にて、排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理が完了する。 At step S38, the control device 60 determines whether or not a specified time has elapsed since the number of revolutions of the EGR blower 50 has been reduced. Here, the purge processing of the exhaust gas recirculation lines G4, G5, G7 is performed until the specified time has elapsed, and when the specified time has elapsed, the operation of the EGR blower 50 is stopped in step S39, and in step S40. The purge valve 61 is closed, the exhaust valve 62 is closed in step S41, and the purge process of the exhaust gas recirculation lines G4, G5, G7 is completed in step S42.
　なお、ここでは、排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理中に、エンジン本体１１の運転が停止したときの排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理について説明したが、排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理中でなくてもよい。例えば、ＥＧＲ運転が停止すると共に、エンジン運転が停止しているとき、乗員がパージ処理スイッチをＯＮすることで、制御装置６０は、パージ処理開始信号を受け、上述した処理を実行してもよい。 Here, the purge process of the exhaust gas recirculation lines G4, G5, G7 when the operation of the engine main body 11 is stopped during the purge process of the exhaust gas recirculation lines G4, G5, G7 has been described. It is not necessary to purge the lines G4, G5 and G7. For example, when the EGR operation is stopped and the engine operation is stopped, the control device 60 may execute the above-described processing upon receiving a purge processing start signal by the occupant turning on the purge processing switch. .
　第２実施形態のＥＧＲシステムにて、パージ装置は、船舶の運航状態に応じて、パージガスの排出を選択することができる。即ち、図９に示すように、船舶の入港時、ＥＣＡ内で、エンジン及びＥＧＲの運転が停止されると、排ガス再循環ラインＧ４に供給された空気を残留していた腐食成分と共に、排気ラインＧ３に排出する。一方、船舶の出航時は、図４と同様にＥＣＡ外で、エンジンの運転が停止せずにＥＧＲの運転が停止されると、排ガス再循環ラインＧ４に供給されたパージガスを残留していた腐食成分と共に、掃気トランク２２（エンジン）に排出する。 In the EGR system of the second embodiment, the purge device can select discharge of the purge gas according to the operation state of the ship. That is, as shown in FIG. 9, when the operation of the engine and the EGR is stopped in the ECA at the time of entry of the ship, the exhaust line together with the remaining corrosive components of the air supplied to the exhaust gas recirculation line G4. Discharge to G3. On the other hand, at the time of departure of the ship, as in FIG. 4, if the operation of the EGR is stopped without stopping the operation of the engine outside the ECA, the purge gas supplied to the exhaust gas recirculation line G4 remains. It discharges to scavenging air trunk 22 (engine) with an ingredient.
　第２実施形態のＥＧＲシステムでは、パージ装置として、パージガス供給ラインＧ１１と、パージバルブ６１と、パージガス排出ラインＧ１２と、排気バルブ６２とを備えている。この場合、排ガス再循環ラインＧ７が第１パージガス排出ラインとして機能し、パージガス排出ラインＧ１２が第２パージガス排出ラインとして機能する。 In the EGR system of the second embodiment, a purge gas supply line G11, a purge valve 61, a purge gas discharge line G12, and an exhaust valve 62 are provided as a purge device. In this case, the exhaust gas recirculation line G7 functions as a first purge gas discharge line, and the purge gas discharge line G12 functions as a second purge gas discharge line.
　従って、パージガス供給ラインＧ１１からパージガスを排ガス再循環ラインＧ４に供給し、排ガス再循環ラインＧ７またはパージガス排出ラインＧ１２からパージガスとともに腐食成分を排出することができる。即ち、パージガスの供給とパージガス及び腐食成分の排出を適正に実施することができる。 Therefore, the purge gas can be supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4, and the corrosive components can be discharged together with the purge gas from the exhaust gas recirculation line G7 or the purge gas discharge line G12. That is, the supply of the purge gas and the discharge of the purge gas and the corrosive component can be properly performed.
　第２実施形態のＥＧＲシステムでは、パージ装置は、パージガス供給ラインＧ１１からのパージガスを排気ラインＧ３に送給するパージガス排出ラインＧ１２と、パージガス供給ラインＧ１２を開閉する排気バルブ６２とを設けている。従って、排気バルブ６２を開放することで、パージガス供給ラインＧ１１から排ガス再循環ラインＧ４に供給されたパージガスが、エンジン本体１１を通さずにパージガス排出ラインＧ１２から排気ラインＧ３に送給されることとなり、エンジン本体１１の運転が停止していても、排ガス再循環ラインＧに残留する腐食成分を除去したパージガスを適正に処理することができる。 In the EGR system of the second embodiment, the purge device is provided with a purge gas discharge line G12 for supplying the purge gas from the purge gas supply line G11 to the exhaust line G3, and an exhaust valve 62 for opening and closing the purge gas supply line G12. Therefore, by opening the exhaust valve 62, the purge gas supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is supplied from the purge gas discharge line G12 to the exhaust line G3 without passing through the engine main body 11. Even if the operation of the engine body 11 is stopped, the purge gas from which the corrosive components remaining in the exhaust gas recirculation line G have been removed can be properly processed.
　第２実施形態のＥＧＲシステムでは、制御装置６０は、ＥＧＲ運転が停止しているとき、エンジン運転停止信号（パージ処理開始信号）が入力すると、パージバルブ６１及び排気バルブ６２を所定期間だけ開放する。従って、ＥＧＲ運転が停止し、エンジン本体１１の運転が停止していても、排ガス再循環ラインＧ４のパージガスをパージガス排出ラインＧ１２から排気ラインＧ３に送給することができ、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留する腐食成分除去したパージガスを適正に処理することができる。 In the EGR system of the second embodiment, when the EGR operation is stopped, the control device 60 opens the purge valve 61 and the exhaust valve 62 for a predetermined period when the engine operation stop signal (purge process start signal) is input. Therefore, even if the EGR operation is stopped and the operation of the engine main body 11 is stopped, the purge gas of the exhaust gas recirculation line G4 can be supplied from the purge gas discharge line G12 to the exhaust line G3, and the exhaust gas recirculation line G4, The purge gas from which the corrosive components remaining in G5 and G7 have been removed can be properly processed.
［第３実施形態］
　図１０は、第３実施形態のＥＧＲシステムを表す概略構成図である。なお、上述した実施形態と同様の機能を有する部材には、同一の符号を付して詳細な説明は省略する。 Third Embodiment
FIG. 10 is a schematic configuration diagram showing an EGR system of the third embodiment. The members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
　第３実施形態にて、図１０に示すように、ＥＧＲシステム１３は、排ガス再循環ラインＧ４、Ｇ５、Ｇ７と、スクラバ４２と、デミスタユニット４９と、ＥＧＲブロワ５０と、パージ装置と、制御装置６０を備えている。ＥＧＲシステム１３は、エンジン本体１１から排出された排ガスの一部を空気と混合した後、過給機１２により圧縮して燃焼用ガスとしてエンジン本体１１に再循環するとき、この再循環する排ガスから有害物質を除去するものである。 In the third embodiment, as shown in FIG. 10, the EGR system 13 includes an exhaust gas recirculation line G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower 50, a purge device, and a control device. It has 60. The EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances.
　パージ装置は、パージガス供給ラインＧ１３と、パージバルブ６１と、パージガス排出ラインＧ１２と、排気バルブ６２とを備えている。パージ装置は、パージガス供給ラインＧ１３からパージガスを供給し、排ガス再循環ラインＧ７またはパージガス排出ラインＧ１２からパージガスとともに腐食成分を排出する。 The purge device includes a purge gas supply line G13, a purge valve 61, a purge gas discharge line G12, and an exhaust valve 62. The purge device supplies a purge gas from the purge gas supply line G13, and discharges a corrosive component together with the purge gas from the exhaust gas recirculation line G7 or the purge gas discharge line G12.
　即ち、パージガス供給ラインＧ１３は、一端部が給気ラインＧ１における掃気トランクとエアクーラ５２との間に連結されると共に、他端部が排ガス再循環ラインＧ４におけるＥＧＲ入口バルブ４１とスクラバ４２との間に連結されている。パージガス供給ラインＧ１３は、パージバルブ６１が設けられ、このパージガス供給ラインＧ１３を開閉可能となっている。 That is, one end of the purge gas supply line G13 is connected between the scavenging air trunk and the air cooler 52 in the air supply line G1, and the other end is between the EGR inlet valve 41 and the scrubber 42 in the exhaust gas recirculation line G4. Is linked to The purge gas supply line G13 is provided with a purge valve 61, and the purge gas supply line G13 can be opened and closed.
　そのため、ＥＧＲ入口バルブ４１を閉止し、パージバルブ６１を開放すると、給気ラインＧ１の掃気（燃焼用ガス）の一部をパージガスとしてパージガス供給ラインＧ１３の一端部から吸入し、このパージガス供給ラインＧ１３を通して排ガス再循環ラインＧ４に供給することができる。そして、パージガス供給ラインＧ１３から排ガス再循環ラインＧ４に供給された空気は、この排ガス再循環ラインＧ４、Ｇ５、Ｇ７、給気ラインＧ１を通してエンジン本体１１の掃気トランク２２に送給される。 Therefore, when the EGR inlet valve 41 is closed and the purge valve 61 is opened, a part of scavenging gas (combustion gas) in the air supply line G1 is sucked as purge gas from one end of the purge gas supply line G13 and passes through the purge gas supply line G13. The exhaust gas recirculation line G4 can be supplied. The air supplied from the purge gas supply line G13 to the exhaust gas recirculation line G4 is supplied to the scavenging trunk 22 of the engine body 11 through the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1.
　制御装置６０は、ＥＧＲ運転停止信号Ｓ２が入力されると、ＥＧＲブロワ５０の回転数を低下させる。その後、ＥＧＲ入口バルブ４１を閉止し、パージバルブ６１を開放させる。すると、エンジン本体１１からの排ガスは、全量が排気ラインＧ３から外部に排出される。また、給気ラインＧ１の掃気の一部がパージガス供給ラインＧ１３に供給され、このパージガス供給ラインＧ１３から排ガス再循環ラインＧ４に供給された空気は、排ガス再循環ラインＧ４、Ｇ５、Ｇ７、給気ラインＧ１を通してエンジン本体１１の掃気トランク２２に送給される。そのため、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留していた腐食成分は、このパージガスにより除去され、腐食成分を含むパージガスが掃気トランク２２に送り込まれる。 The control device 60 reduces the rotational speed of the EGR blower 50 when the EGR operation stop signal S2 is input. Thereafter, the EGR inlet valve 41 is closed and the purge valve 61 is opened. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, part of the scavenging air in the air supply line G1 is supplied to the purge gas supply line G13, and the air supplied from the purge gas supply line G13 to the exhaust gas recirculation line G4 is an exhaust gas recirculation line G4, G5, G7, the air supply It is supplied to the scavenging air trunk 22 of the engine body 11 through the line G1. Therefore, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are removed by the purge gas, and the purge gas containing the corrosive components is sent to the scavenging trunk 22.
　このように第３実施形態のＥＧＲシステムにあっては、排ガス再循環ラインＧ４と、ＥＧＲ入口バルブ４１と、スクラバ４２との間から排ガス再循環ラインＧ４、Ｇ５、Ｇ７にパージガスを供給して残留する腐食成分を排出するパージ装置としてのパージガス供給ラインＧ１３とを設け、パージ装置は、エンジン本体１１に供給される掃気の一部をパージガスとして排ガス再循環ラインＧ４、Ｇ５、Ｇ７に供給する。 As described above, in the EGR system according to the third embodiment, the purge gas is supplied to the exhaust gas recirculation lines G4, G5, G7 from between the exhaust gas recirculation line G4, the EGR inlet valve 41, and the scrubber 42 to remain. The purge device is provided with a purge gas supply line G13 as a purge device for discharging the corrosive components, and the purge device supplies a part of the scavenging gas supplied to the engine main body 11 to the exhaust gas recirculation lines G4, G5, G7 as a purge gas.
　従って、パージ装置がパージガス供給ラインＧ１３から排ガス再循環ラインＧ４、Ｇ５、Ｇ７にパージガスとしての掃気の一部を供給すると、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留した腐食成分が掃気と共に排出される。そのため、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留する腐食成分を除去することで、排ガス再循環ラインＧ４、Ｇ５、Ｇ７を構成する配管の腐食を防止することができる。また、エンジン本体１１への掃気の一部を抜き取って排ガス再循環ラインＧ４、Ｇ５、Ｇ７に供給することで、残留する腐食成分を排出することから、排ガス再循環ラインＧ４、Ｇ５、Ｇ７を適正にパージ処理することができる。 Therefore, when the purge device supplies part of the scavenging gas as the purge gas from the purge gas supply line G13 to the exhaust gas recirculation lines G4, G5, G7, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are exhausted together with the scavenging Ru. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, it is possible to prevent the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7. Further, by removing part of the scavenging air to the engine main body 11 and supplying it to the exhaust gas recirculation lines G4, G5, G7, the remaining corrosive components are discharged, so the exhaust gas recirculation lines G4, G5, G7 are appropriate. Can be purged.
［第４実施形態］
　図１１は、第４実施形態のＥＧＲシステムを表す概略構成図、図１２は、ＥＧＲシステムにおけるＥＧＲ運転停止時のパージ制御を表すフローチャートである。なお、上述した実施形態と同様の機能を有する部材には、同一の符号を付して詳細な説明は省略する。 Fourth Embodiment
FIG. 11 is a schematic block diagram showing the EGR system of the fourth embodiment, and FIG. 12 is a flowchart showing purge control at the time of EGR operation stop in the EGR system. The members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
　第４実施形態にて、図１１に示すように、ＥＧＲシステム１３は、排ガス再循環ラインＧ４、Ｇ５、Ｇ７と、スクラバ４２と、デミスタユニット４９と、ＥＧＲブロワ５０と、パージ装置と、制御装置６０を備えている。ＥＧＲシステム１３は、エンジン本体１１から排出された排ガスの一部を空気と混合した後、過給機１２により圧縮して燃焼用ガスとしてエンジン本体１１に再循環するとき、この再循環する排ガスから有害物質を除去するものである。 In the fourth embodiment, as shown in FIG. 11, the EGR system 13 includes exhaust gas recirculation lines G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower 50, a purge device, and a control device. It has 60. The EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances.
　パージ装置は、パージガス供給ラインＧ１５と、パージバルブ７１を備えている。この場合、排ガス再循環ラインＧ４がパージガス排出ラインとして機能する。パージ装置は、パージガス供給ラインＧ１５から排ガス再循環ラインＧ７にパージガスを供給し、排気ラインＧ３からパージガスと腐食成分を排出する。 The purge device includes a purge gas supply line G15 and a purge valve 71. In this case, the exhaust gas recirculation line G4 functions as a purge gas discharge line. The purge device supplies a purge gas from the purge gas supply line G15 to the exhaust gas recirculation line G7, and discharges the purge gas and the corrosive component from the exhaust line G3.
　即ち、パージガス供給ラインＧ１５は、一端部が大気に開放され、他端部が排ガス再循環ラインＧ４の下流側に連結される排ガス再循環ラインＧ７におけるＥＧＲブロワ５０とＥＧＲ出口バルブ５１との間に連結されている。パージガス供給ラインＧ１５は、パージバルブ７１が設けられ、このパージガス供給ラインＧ１５を開閉可能となっている。そのため、ＥＧＲ出口バルブ５１を閉止し、パージバルブ７１を開放すると、パージガスとしての外気（空気）をパージガス供給ラインＧ１５の一端部から吸入し、このパージガス供給ラインＧ１５を通して排ガス再循環ラインＧ７に供給することができる。なお、パージガス供給ラインＧ１５は、一端部は圧縮空気供給源が接続されていても良い。圧縮空気供給源６３は、例えば、圧縮機と蓄圧タンクなどから構成されており、圧縮機により生成した圧縮空気を蓄圧タンクに溜めているものであり、船内で使用する各種機器に対して圧縮空気を供給することができる。この場合、ＥＧＲブロワ５０を駆動させることなく、パージガスを供給することができる。 That is, the purge gas supply line G15 has one end opened to the atmosphere and the other end connected to the downstream side of the exhaust gas recirculation line G4 between the EGR blower 50 and the EGR outlet valve 51 in the exhaust gas recirculation line G7. It is connected. The purge gas supply line G15 is provided with a purge valve 71, and the purge gas supply line G15 can be opened and closed. Therefore, closing the EGR outlet valve 51 and opening the purge valve 71 sucks outside air (air) as purge gas from one end of the purge gas supply line G15 and supplies it to the exhaust gas recirculation line G7 through the purge gas supply line G15. Can. A compressed air supply source may be connected to one end of the purge gas supply line G15. The compressed air supply source 63 includes, for example, a compressor and a pressure accumulation tank, and the compressed air generated by the compressor is stored in the pressure accumulation tank, and the compressed air is supplied to various devices used in the ship. Can be supplied. In this case, the purge gas can be supplied without driving the EGR blower 50.
　排ガス再循環ラインＧ４、Ｇ５、Ｇ７の経路中にはＥＧＲブロワ５０が設けられていることから、ＥＧＲブロワ５０を逆転駆動することで、排ガス供給ラインＧ７から排気ラインＧ３側へのガス流れを作用させることができる。そのため、ＥＧＲブロワ５０を逆転駆動することで、パージガス供給ラインＧ１５から排ガス供給ラインＧ７に供給された空気は、この排ガス供給ラインＧ７から排気ラインＧ３に送給される。 Since the EGR blower 50 is provided in the path of the exhaust gas recirculation lines G4, G5, G7, the gas flow from the exhaust gas supply line G7 to the exhaust line G3 side is operated by driving the EGR blower 50 in reverse. It can be done. Therefore, by driving the EGR blower 50 in reverse, the air supplied from the purge gas supply line G15 to the exhaust gas supply line G7 is supplied from the exhaust gas supply line G7 to the exhaust line G3.
　制御装置６０は、船舶の運航状態（運航海域）に応じてＥＧＲ入口バルブ４１、ＥＧＲ出口バルブ５１、パージバルブ７１を開閉制御可能であると共に、ＥＧＲブロワ５０を駆動制御可能である。即ち、制御装置６０は、現在の船舶の運航海域がＮＯｘの排出量を規制するＮＯｘ規制海域内であれば、ＥＧＲ運転開始信号Ｓ１が入力され、ＥＧＲ入口バルブ４１、ＥＧＲ出口バルブ５１を開放すると共に、ＥＧＲブロワ５０を正転駆動する。すると、エンジン本体１１から排出された排ガスは、一部が排気ラインＧ３から排ガス再循環ラインＧ４に供給される。 The control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, and the purge valve 71 in accordance with the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50. That is, the control device 60 receives the EGR operation start signal S1 and opens the EGR inlet valve 41 and the EGR outlet valve 51 if the current operation area of the ship is in the NOx control area where emission of NOx is restricted. At the same time, the EGR blower 50 is driven to rotate normally. Then, a part of the exhaust gas discharged from the engine body 11 is supplied from the exhaust line G3 to the exhaust gas recirculation line G4.
　そして、制御装置６０は、現在の船舶の運航海域がＥＣＡ内からＥＣＡ外に移動すると、ＥＧＲ運転停止信号Ｓ２が入力され、ＥＧＲ出口バルブ５１を閉止し、パージバルブ７１を開放すると共に、ＥＧＲブロワ５０を逆転駆動する。すると、エンジン本体１１からの排ガスは、全量が排気ラインＧ３から外部に排出される。また、パージガス供給ラインＧ１５から排ガス再循環ラインＧ７に供給された空気は、排気ラインＧ３に送給される。 Then, the control device 60 receives the EGR operation stop signal S2 when the current operation area of the ship moves from inside the ECA to outside the ECA, closes the EGR outlet valve 51, opens the purge valve 71, and the EGR blower 50. Drive in reverse. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, the air supplied from the purge gas supply line G15 to the exhaust gas recirculation line G7 is supplied to the exhaust line G3.
　ここで、ＥＧＲシステムにおける排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ制御について説明する。ＥＧＲ運転停止時のパージ制御について、図１１及び図１２に示すように、ステップＳ５１にて、制御装置６０は、ＥＧＲ運転停止信号Ｓ２が入力されると、ＥＧＲ運転停止シーケンスが開始され、ステップＳ５２にて、ＥＧＲブロワ５０の回転を停止させ、ステップＳ５３にて、ＥＧＲブロワ５０の回転が停止したかどうかを判定する。ここで、ＥＧＲブロワ５０の回転が停止するまで待機し、ＥＧＲブロワ５０の回転が停止したら、ステップＳ５６に移行する。また、ステップＳ５４にて、ＥＧＲ出口バルブ５１の閉動作を開始し、ステップＳ５５にて、ＥＧＲ出口バルブ５１の開度が予め設定された開度以下になったかどうかを判定する。ここで、ＥＧＲ出口バルブ５１の開度が設定開度以下になるまで待機し、ＥＧＲ出口バルブ５１の開度が全閉となったら、ステップＳ５６に移行する。 Here, purge control of the exhaust gas recirculation lines G4, G5, G7 in the EGR system will be described. Regarding purge control at the time of EGR operation stop, as shown in FIG. 11 and FIG. 12, when the EGR operation stop signal S2 is input in step S51, the control device 60 starts the EGR operation stop sequence, and step S52 Then, the rotation of the EGR blower 50 is stopped, and in step S53, it is determined whether the rotation of the EGR blower 50 has stopped. Here, the process waits until the rotation of the EGR blower 50 stops, and when the rotation of the EGR blower 50 stops, the process proceeds to step S56. In step S54, the closing operation of the EGR outlet valve 51 is started, and in step S55, it is determined whether the opening degree of the EGR outlet valve 51 has become equal to or less than a preset opening degree. Here, the process waits until the opening degree of the EGR outlet valve 51 becomes equal to or less than the set opening degree, and when the opening degree of the EGR outlet valve 51 is fully closed, the process proceeds to step S56.
　制御装置６０は、ステップＳ５６にて、パージバルブ７１の開動作を開始し、ステップＳ５７にて、パージバルブ７１の開度が全開になったかどうかを判定する。ここで、パージバルブ７１の開度が全開になるまで待機し、パージバルブ７１の開度が全開になったら、ステップＳ５８にて、ＥＧＲブロワ５０の逆転駆動を開始すると、ステップＳ５９にて、排ガス再循環ラインＧ４のパージ処理を予め設定された規定時間だけ実行する。即ち、排ガス再循環ラインＧ４は、ＥＧＲブロワ５０が逆転駆動していることから、排気ラインＧ３側へのガス流れが生じており、パージガス供給ラインＧ１５から取り込まれた空気は、この排ガス再循環ラインＧ７から排気ラインＧ３に送給される。そのため、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留していた腐食成分としてのＮＯｘやＳＯｘは、このパージガスにより除去され、腐食成分を含むパージガスが排気ラインＧ３に送り込まれる。 In step S56, the controller 60 starts the opening operation of the purge valve 71, and in step S57 determines whether the opening degree of the purge valve 71 is fully opened. Here, the process waits until the opening degree of the purge valve 71 is fully opened, and when the opening degree of the purge valve 71 is fully opened, reverse driving of the EGR blower 50 is started in step S58, exhaust gas recirculation in step S59. The purge process of the line G4 is executed for a predetermined time set in advance. That is, since the EGR blower 50 is reversely driven, the exhaust gas recirculation line G4 has a gas flow toward the exhaust line G3, and the air taken in from the purge gas supply line G15 is the exhaust gas recirculation line. It is fed to the exhaust line G3 from G7. Therefore, NOx and SOx as corrosive components remaining in the exhaust gas recirculation lines G4, G5 and G7 are removed by this purge gas, and a purge gas containing corrosive components is sent to the exhaust line G3.
　制御装置６０は、ステップＳ６０にて、ＥＧＲブロワ５０が逆転駆動を開始してから規定時間が経過したかどうかを判定する。ここで、規定時間が経過するまで排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理を実行する。そして、規定時間が経過したら、ステップＳ６１にて、ＥＧＲブロワ５０の運転を停止し、ステップＳ６２にて、パージバルブ７１を閉止し、ステップＳ６３にて、ＥＧＲ入口バルブ４１を閉止し、ステップＳ６４にて、排ガス再循環ラインＧ４、Ｇ５、Ｇ７のパージ処理が完了する。 At step S60, the control device 60 determines whether or not a specified time has elapsed since the EGR blower 50 started reverse driving. Here, the purge process of the exhaust gas recirculation lines G4, G5, G7 is executed until the specified time has elapsed. When the specified time has elapsed, the operation of the EGR blower 50 is stopped in step S61, the purge valve 71 is closed in step S62, the EGR inlet valve 41 is closed in step S63, and the process is performed in step S64. The purge process of the exhaust gas recirculation lines G4, G5 and G7 is completed.
　なお、本実施形態では、パージガスにより排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留していた腐食成分を排気ラインＧ３に排出することから、エンジン本体１１の運転が停止しても、上述した手順により排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留していた腐食成分をパージすることができる。 In the present embodiment, since the corrosive components remaining in the exhaust gas recirculation lines G4, G5 and G7 are discharged to the exhaust line G3 by the purge gas, even if the operation of the engine main body 11 is stopped, the procedure described above is performed. The corrosion components remaining in the exhaust gas recirculation lines G4, G5 and G7 can be purged.
　このように第４実施形態のＥＧＲシステムにあっては、エンジン本体１１から排出された排ガスの一部を燃焼用ガスの一部としてエンジン本体１１に再循環する排ガス再循環ラインＧ４、Ｇ５、Ｇ７と、排ガス再循環ラインＧ４に設けられるＥＧＲ入口バルブ４１と、排ガス再循環ラインＧ７に設けられるＥＧＲ出口バルブ５１と、ＥＧＲブロワ５０と、排ガスから有害物質を除去するスクラバ４２と、排ガス再循環ラインＧ４、Ｇ５、Ｇ７にパージガスを供給して残留する腐食成分を排出するパージ装置としてのパージガス供給ラインＧ１５とを設けている。 Thus, in the EGR system of the fourth embodiment, exhaust gas recirculation lines G4, G5, G7 recirculate a part of the exhaust gas discharged from the engine main body 11 to the engine main body 11 as a part of the combustion gas. The EGR inlet valve 41 provided in the exhaust gas recirculation line G4, the EGR outlet valve 51 provided in the exhaust gas recirculation line G7, the EGR blower 50, the scrubber 42 for removing harmful substances from the exhaust gas, the exhaust gas recirculation line A purge gas supply line G15 is provided as a purge device that supplies purge gas to G4, G5, and G7 and discharges the remaining corrosive components.
　従って、ＥＧＲ出口バルブ５１が閉止されると、パージ装置がパージガス供給ラインＧ１５から排ガス再循環ラインＧ７にパージガスを供給することとなり、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留した腐食成分がパージガスと共に排出される。そのため、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留する腐食成分を除去することで、排ガス再循環ラインＧ４、Ｇ５、Ｇ７を構成する配管の腐食を防止することができる。 Therefore, when the EGR outlet valve 51 is closed, the purge device supplies the purge gas from the purge gas supply line G15 to the exhaust gas recirculation line G7, and the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are together with the purge gas. Exhausted. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, it is possible to prevent the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7.
　第４実施形態のＥＧＲシステムでは、パージ装置として、排ガス再循環ラインＧ７におけるＥＧＲブロワ５０より下流側（ＥＧＲブロワ５０とＥＧＲ出口バルブ５１との間）に連結されるパージガス供給ラインＧ１５と、パージガス供給ラインＧ１５を開閉するパージバルブ７１と、パージガス供給ラインＧ１５からのパージガスを排ガス再循環ラインＧ４、Ｇ５、Ｇ７を逆方向に送給するＥＧＲブロワ５０とを設けている。従って、ＥＧＲ出口バルブ５１が閉止されると、パージバルブ７１を開放すると共にＥＧＲブロワ５０を逆転駆動することで、パージガスがパージガス供給ラインＧ１５から排ガス再循環ラインＧ４、Ｇ５、Ｇ７を介して排気ラインＧ３に供給されることとなり、スクラバ４２、デミスタユニット４９、ＥＧＲブロワ５０を含む排ガス再循環ラインＧ４に残留する腐食成分を除去することができ、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留する腐食成分を適正に除去することができる。 In the EGR system of the fourth embodiment, as a purge device, a purge gas supply line G15 connected to the downstream side of the exhaust gas recirculation line G7 downstream of the EGR blower 50 (between the EGR blower 50 and the EGR outlet valve 51), and a purge gas supply A purge valve 71 for opening and closing the line G15 and an EGR blower 50 for feeding the purge gas from the purge gas supply line G15 in the reverse direction to the exhaust gas recirculation lines G4, G5 and G7 are provided. Therefore, when the EGR outlet valve 51 is closed, the purge valve 71 is opened and the EGR blower 50 is reversely driven, whereby the purge gas is discharged from the purge gas supply line G15 through the exhaust gas recirculation lines G4, G5, G7 to the exhaust line G3. The corrosive components remaining in the exhaust gas recirculation line G4 including the scrubber 42, the demister unit 49, and the EGR blower 50 can be removed, and the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7. Can be properly removed.
　第４実施形態のＥＧＲシステムでは、ＥＧＲ運転停止信号Ｓ２が入力したときにＥＧＲ出口バルブ５１を閉止してパージバルブ７１を所定期間だけ開放する制御装置６０を設けている。従って、制御装置６０は、ＥＧＲ運転停止信号Ｓ２が入力すると、ＥＧＲ出口バルブ５１を閉止してパージバルブ７１を所定期間だけ開放するため、ＥＧＲ運転が停止すると、パージガスがパージガス供給ラインＧ１５から排ガス再循環ラインＧ４に供給されることとなり、パージガスにより早期に排ガス再循環ラインＧ４に残留する腐食成分を除去することができる。 The EGR system of the fourth embodiment is provided with a control device 60 which closes the EGR outlet valve 51 and opens the purge valve 71 for a predetermined period when the EGR operation stop signal S2 is input. Therefore, the control device 60 closes the EGR outlet valve 51 and opens the purge valve 71 for a predetermined period when the EGR operation stop signal S2 is input. Therefore, when the EGR operation is stopped, the purge gas is recirculated from the purge gas supply line G15. The gas is supplied to the line G4, and the corrosive components remaining in the exhaust gas recirculation line G4 can be removed early by the purge gas.
［第５実施形態］
　図１３は、第５実施形態のＥＧＲシステムを表す概略構成図である。なお、上述した実施形態と同様の機能を有する部材には、同一の符号を付して詳細な説明は省略する。 Fifth Embodiment
FIG. 13 is a schematic configuration diagram showing an EGR system of a fifth embodiment. The members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
　第５実施形態にて、図１３に示すように、ＥＧＲシステム１３は、排ガス再循環ラインＧ４、Ｇ５、Ｇ７と、スクラバ４２と、デミスタユニット４９と、ＥＧＲブロワ５０と、パージ装置と、制御装置６０を備えている。ＥＧＲシステム１３は、エンジン本体１１から排出された排ガスの一部を空気と混合した後、過給機１２により圧縮して燃焼用ガスとしてエンジン本体１１に再循環するとき、この再循環する排ガスから有害物質を除去するものである。 In the fifth embodiment, as shown in FIG. 13, the EGR system 13 includes an exhaust gas recirculation line G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower 50, a purge device, and a control device. It has 60. The EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances.
　パージ装置は、パージガス供給ラインＧ１６と、パージバルブ７１と、排気ラインＧ３とを備えている。パージ装置は、パージガス供給ラインＧ１６から排ガス再循環ラインＧ７にパージガスを供給し、排気ラインＧ３からパージガスと腐食成分を排出する。 The purge device includes a purge gas supply line G16, a purge valve 71, and an exhaust line G3. The purge device supplies the purge gas from the purge gas supply line G16 to the exhaust gas recirculation line G7, and discharges the purge gas and the corrosive component from the exhaust line G3.
　即ち、パージガス供給ラインＧ１６は、一端部が給気ラインＧ１における掃気トランクとエアクーラ５２との間に連結されると共に、他端部が排ガス再循環ラインＧ７におけるＥＧＲブロワ５０とＥＧＲ出口バルブ５１との間に連結されている。パージガス供給ラインＧ１６は、パージバルブ７１が設けられ、このパージガス供給ラインＧ１６を開閉可能となっている。 That is, one end of the purge gas supply line G16 is connected between the scavenging air trunk and the air cooler 52 in the air supply line G1, and the other end is the EGR blower 50 and the EGR outlet valve 51 in the exhaust gas recirculation line G7. It is connected between. The purge gas supply line G16 is provided with a purge valve 71, and this purge gas supply line G16 can be opened and closed.
　そのため、ＥＧＲ出口バルブ５１を閉止し、パージバルブ７１を開放すると、給気ラインＧ１の掃気（燃焼用ガス）の一部をパージガスとしてパージガス供給ラインＧ１６の一端部から吸入し、このパージガス供給ラインＧ１６を通して排ガス再循環ラインＧ７に供給することができる。そして、パージガス供給ラインＧ１６から排ガス再循環ラインＧ７に供給されたパージガスは、排気ラインＧ３に送給される。 Therefore, when the EGR outlet valve 51 is closed and the purge valve 71 is opened, a part of scavenging gas (combustion gas) in the air supply line G1 is sucked as purge gas from one end of the purge gas supply line G16, The exhaust gas recirculation line G7 can be supplied. Then, the purge gas supplied from the purge gas supply line G16 to the exhaust gas recirculation line G7 is supplied to the exhaust line G3.
　制御装置６０は、ＥＧＲ運転停止信号Ｓ２が入力されると、ＥＧＲ出口バルブ５１を閉止し、パージバルブ７１を開放する。すると、エンジン本体１１からの排ガスは、全量が排気ラインＧ３から外部に排出される。また、給気ラインＧ１の掃気の一部がパージガス供給ラインＧ１６に供給され、このパージガス供給ラインＧ１６から排ガス再循環ラインＧ４、Ｇ５、Ｇ７を通して排気ラインＧ３に送給される。そのため、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留していた腐食成分は、このパージガスにより除去され、腐食成分を含むパージガスが排気ラインＧ３に排出される。 The control device 60 closes the EGR outlet valve 51 and opens the purge valve 71 when the EGR operation stop signal S2 is input. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, part of the scavenging air of the air supply line G1 is supplied to the purge gas supply line G16, and is supplied from the purge gas supply line G16 to the exhaust line G3 through the exhaust gas recirculation lines G4, G5, G7. Therefore, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are removed by the purge gas, and the purge gas containing the corrosive components is discharged to the exhaust line G3.
　このように第５実施形態のＥＧＲシステムにあっては、排ガス再循環ラインＧ４、Ｇ５、Ｇ７と、ＥＧＲ入口バルブ４１と、スクラバ４２と、ＥＧＲブロワ５０と、ＥＧＲ出口バルブ５１と、排ガス再循環ラインＧ７にパージガスを供給して残留する腐食成分を排出するパージ装置としてのパージガス供給ラインＧ１６とを設け、パージ装置は、エンジン本体１１に供給される掃気の一部をパージガスとして排ガス再循環ラインＧ４に供給する。 Thus, in the EGR system of the fifth embodiment, the exhaust gas recirculation lines G4, G5, G7, the EGR inlet valve 41, the scrubber 42, the EGR blower 50, the EGR outlet valve 51, the exhaust gas recirculation A purge gas is supplied to the line G7 to provide a purge gas supply line G16 as a purge device for discharging remaining corrosive components. The purge device uses a part of scavenging gas supplied to the engine main body 11 as a purge gas. Supply to
　従って、パージ装置がパージガス供給ラインＧ１６から排ガス再循環ラインＧ４にパージガスとしての掃気の一部を供給すると、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留した腐食成分が掃気と共に排出される。そのため、排ガス再循環ラインＧ４、Ｇ５、Ｇ７に残留する腐食成分を除去することで、排ガス再循環ラインＧ４、Ｇ５、Ｇ７を構成する配管の腐食を防止することができる。また、エンジン本体１１への掃気の一部を抜き取って排ガス再循環ラインＧ４、Ｇ５、Ｇ７に供給することで、残留する腐食成分を排出することから、排ガス再循環ラインＧ４、Ｇ５、Ｇ７を適正にパージ処理することができる。 Therefore, when the purge device supplies a part of scavenging gas as the purge gas from the purge gas supply line G16 to the exhaust gas recirculation line G4, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are discharged together with the scavenging air. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, it is possible to prevent the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7. Further, by removing part of the scavenging air to the engine main body 11 and supplying it to the exhaust gas recirculation lines G4, G5, G7, the remaining corrosive components are discharged, so the exhaust gas recirculation lines G4, G5, G7 are appropriate. Can be purged.
　なお、上述した実施形態にて、舶用ディーゼルエンジンとして、主機関を用いて説明したが、発電機として用いられるディーゼルエンジンにも適用することができる。 In the embodiment described above, the marine diesel engine has been described using the main engine, but the invention can also be applied to a diesel engine used as a generator.
　１０　舶用ディーゼルエンジン
　１１　エンジン本体
　１２　過給機
　１３　ＥＧＲシステム
　４１　ＥＧＲ入口バルブ
　４２　スクラバ（ベンチュリスクラバ）
　４９　デミスタユニット
　５０　ＥＧＲブロワ
　５１　ＥＧＲ出口バルブ
　５２　エアクーラ（冷却器）
　６０　制御装置
　６１　パージバルブ（パージ装置）
　６２　排気バルブ（パージ装置）
　６３　圧縮空気供給源
　Ｇ１　給気ライン
　Ｇ２，Ｇ３　排気ライン
　Ｇ４　排ガス再循環ライン（第１ライン）
　Ｇ５　排ガス再循環ライン（第２ライン）
　Ｇ６　吸入ライン
　Ｇ７　排ガス再循環ライン（第３ライン）
　Ｇ１１，Ｇ１３，Ｇ１４，Ｇ１５，Ｇ１６，Ｇ１７　パージガス供給ライン（パージ装置）
　Ｇ１２　パージガス排出ライン（パージ装置） 10 Marine Diesel Engine 11 Engine Body 12 Turbocharger 13 EGR System 41 EGR Inlet Valve 42 Scrubber (Venturi Scrubber)
49 demister unit 50 EGR blower 51 EGR outlet valve 52 air cooler (cooler)
60 Controller 61 Purge valve (Purge device)
62 Exhaust valve (purge device)
63 Compressed air supply source G1 Supply line G2, G3 Exhaust line G4 Exhaust gas recirculation line (1st line)
G5 Exhaust gas recirculation line (2nd line)
G6 suction line G7 exhaust gas recirculation line (third line)
G11, G13, G14, G15, G16, G17 Purge gas supply line (purge device)
G12 Purge gas discharge line (purge device)

Claims (13)

  1. 　エンジンから排出された排ガスの一部を燃焼用ガスの一部として前記エンジンに再循環する排ガス再循環ラインと、
    　前記排ガス再循環ラインに設けられるＥＧＲ入口バルブと、
    　前記排ガス再循環ラインにパージガスを供給して残留する腐食成分を排出するパージ装置と、
    　を備えることを特徴とするＥＧＲシステム。     An exhaust gas recirculation line for recirculating a part of exhaust gas discharged from the engine to the engine as a part of combustion gas;
    An EGR inlet valve provided in the exhaust gas recirculation line;
    A purge device for supplying a purge gas to the exhaust gas recirculation line to discharge residual corrosive components;
    An EGR system comprising:
  2. 　前記パージ装置は、前記排ガス再循環ラインにパージガスを供給するパージガス供給ラインと、パージガスと共に残留する腐食成分を排出するパージガス排出ラインとを備えることを特徴とする請求項１に記載のＥＧＲシステム。 The EGR system according to claim 1, wherein the purge device comprises a purge gas supply line for supplying a purge gas to the exhaust gas recirculation line and a purge gas discharge line for discharging a corrosive component remaining with the purge gas.
  3. 　前記排ガス再循環ラインにおける前記ＥＧＲ入口バルブより下流側に設けられるスクラバを備え、前記パージガス供給ラインは、前記排ガス再循環ラインにおける前記ＥＧＲ入口バルブと前記スクラバとの間に連結され、前記パージガス供給ラインを開閉するパージバルブが設けられることを特徴とする請求項２に記載のＥＧＲシステム。 The exhaust gas recirculation line includes a scrubber provided downstream of the EGR inlet valve, and the purge gas supply line is connected between the EGR inlet valve and the scrubber in the exhaust gas recirculation line, and the purge gas supply line The EGR system according to claim 2, further comprising a purge valve for opening and closing the valve.
  4. 　ＥＧＲ運転停止信号が入力したときに前記ＥＧＲ入口バルブを閉止して前記パージバルブを所定期間だけ開放することを特徴とする請求項３に記載のＥＧＲシステム。 4. The EGR system according to claim 3, wherein the EGR inlet valve is closed to open the purge valve for a predetermined period when an EGR operation stop signal is input.
  5. 　前記パージガス排出ラインは、前記パージガス供給ラインからのパージガスを前記排ガス再循環ラインから前記エンジンに排出する第１パージガス排出ラインが設けられることを特徴とする請求項２から請求項４のいずれか一項に記載のＥＧＲシステム。 The purge gas discharge line is provided with a first purge gas discharge line for discharging a purge gas from the purge gas supply line from the exhaust gas recirculation line to the engine. EGR system described in.
  6. 　前記パージガス排出ラインは、前記パージガス供給ラインからのパージガスを排気ラインに排出する第２パージガス排出ラインが設けられ、前記第２パージガス排出ラインを開閉する排気バルブが設けられることを特徴とする請求項２から請求項５のいずれか一項に記載のＥＧＲシステム。 The purge gas discharge line is provided with a second purge gas discharge line for discharging the purge gas from the purge gas supply line to an exhaust line, and an exhaust valve for opening and closing the second purge gas discharge line. An EGR system according to any one of the preceding claims.
  7. 　ＥＧＲ運転が停止しているとき、前記排気バルブを所定期間だけ開放することを特徴とする請求項６に記載のＥＧＲシステム。 The EGR system according to claim 6, wherein the exhaust valve is opened only for a predetermined period when the EGR operation is stopped.
  8. 　前記パージ装置は、外気をパージガスとして前記排ガス再循環ラインに供給することを特徴とする請求項１から請求項７のいずれか一項に記載のＥＧＲシステム。 The EGR system according to any one of claims 1 to 7, wherein the purge device supplies outside air as a purge gas to the exhaust gas recirculation line.
  9. 　前記パージ装置は、前記エンジンに供給される掃気の一部をパージガスとして前記排ガス再循環ラインに供給することを特徴とする請求項１から請求項７のいずれか一項に記載のＥＧＲシステム。 The EGR system according to any one of claims 1 to 7, wherein the purge device supplies a part of scavenging air supplied to the engine as a purge gas to the exhaust gas recirculation line.
  10. 　前記パージ装置は、圧縮空気をパージガスとして前記排ガス再循環ラインに供給することを特徴とする請求項１から請求項７のいずれか一項に記載のＥＧＲシステム。 The EGR system according to any one of claims 1 to 7, wherein the purge device supplies compressed air as a purge gas to the exhaust gas recirculation line.
  11. 　前記排ガス再循環ラインにおける前記ＥＧＲ入口バルブより下流側に設けられるスクラバを備え、前記パージガス供給ラインは、前記排ガス再循環ラインにおける前記スクラバより下流側に連結され、前記パージガス供給ラインを開閉するパージバルブと、前記パージガス供給ラインからのパージガスを前記排ガス再循環ラインを逆方向に送給するブロワとが設けられることを特徴とする請求項２に記載のＥＧＲシステム。 A purge valve provided downstream of the EGR inlet valve in the exhaust gas recirculation line, the purge gas supply line connected downstream of the scrubber in the exhaust gas recirculation line, and opening and closing the purge gas supply line; The EGR system according to claim 2, further comprising: a blower for feeding the purge gas from the purge gas supply line in the reverse direction of the exhaust gas recirculation line.
  12. 　前記パージガス供給ラインは、前記パージガス供給ラインからのパージガスを前記排ガス再循環ラインから排気ラインに排出することを特徴とする請求項１１に記載のＥＧＲシステム。 The EGR system according to claim 11, wherein the purge gas supply line discharges the purge gas from the purge gas supply line from the exhaust gas recirculation line to an exhaust line.
  13. 　前記排ガス再循環ラインにおける前記パージガス供給ラインの連結部より下流側に設けられるＥＧＲ出口バルブと、ＥＧＲ運転を停止したときに前記ＥＧＲ出口バルブを閉止して前記パージバルブを所定期間だけ開放することを特徴とする請求項１１または請求項１２に記載のＥＧＲシステム。 An EGR outlet valve provided downstream of a connection portion of the purge gas supply line in the exhaust gas recirculation line, and closing the EGR outlet valve when the EGR operation is stopped, and the purge valve is opened for a predetermined period. The EGR system according to claim 11 or claim 12.
PCT/JP2016/059015 2015-03-31 2016-03-22 Egr system WO2016158570A1 (en)

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