WO2011077703A1 - 排気浄化装置 - Google Patents

排気浄化装置 Download PDF

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Publication number
WO2011077703A1
WO2011077703A1 PCT/JP2010/007399 JP2010007399W WO2011077703A1 WO 2011077703 A1 WO2011077703 A1 WO 2011077703A1 JP 2010007399 W JP2010007399 W JP 2010007399W WO 2011077703 A1 WO2011077703 A1 WO 2011077703A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
urea water
opening
mixing pipe
flow
Prior art date
Application number
PCT/JP2010/007399
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English (en)
French (fr)
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WO2011077703A9 (ja
Inventor
稔 小和田
Original Assignee
日野自動車株式会社
いすゞ自動車株式会社
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.)
Filing date
Publication date
Application filed by 日野自動車株式会社, いすゞ自動車株式会社 filed Critical 日野自動車株式会社
Priority to CN201080059096.9A priority Critical patent/CN102762828B/zh
Priority to AU2010334192A priority patent/AU2010334192B2/en
Priority to US13/515,379 priority patent/US8813481B2/en
Priority to EP10838942.0A priority patent/EP2518287B1/en
Publication of WO2011077703A1 publication Critical patent/WO2011077703A1/ja
Publication of WO2011077703A9 publication Critical patent/WO2011077703A9/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/02—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate silencers in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an exhaust purification device.
  • a selective reduction catalyst that includes a particulate filter that collects particulates in exhaust gas in the middle of an exhaust pipe, and that can selectively react NOx with ammonia even in the presence of oxygen on the downstream side of the particulate filter. It is considered that urea water is added as a reducing agent between the selective reduction catalyst and the particulate filter to simultaneously reduce particulates and NOx.
  • a particulate filter 3 for collecting particulates in the exhaust gas 1 and a downstream side of the particulate filter 3.
  • a selective reduction catalyst 4 having the property of selectively reacting NOx with ammonia even in the presence of oxygen is held in parallel by the casings 5 and 6, and arranged in parallel with the outlet end of the particulate filter 3.
  • the inlet side end portion of the selective catalytic reduction catalyst 4 is connected by a communication channel 7 having an S-shaped structure, and the exhaust gas 1 discharged from the outlet side end portion of the particulate filter 3 is folded back in the reverse direction.
  • An exhaust emission control device introduced into the inlet side end of the selective catalytic reduction catalyst 4 has been devised.
  • the communication channel 7 surrounds the outlet side end of the particulate filter 3 and collects the exhaust gas 1 immediately after exiting from the outlet side end while changing the direction in a substantially perpendicular direction.
  • the S-shaped structure is formed by the gas dispersion chamber 7C surrounding the inlet side end so that the dispersed exhaust gas 1 can be introduced into the inlet side end of the selective catalytic reduction catalyst 4 while being dispersed.
  • a urea water addition injector 8 (urea water addition hand) for adding urea water into the mixing pipe 7B is provided. It is equipped toward the outlet end side of the mixing pipe 7B.
  • an oxidation catalyst 9 that oxidizes unburned fuel in the exhaust gas 1 is provided in the front stage in the casing 5 in which the particulate filter 3 is held,
  • an ammonia reduction catalyst 10 that oxidizes surplus ammonia is provided at the rear stage in the casing 6 in which the selective catalytic reduction catalyst 4 is held.
  • particulates in the exhaust gas 1 are collected by the particulate filter 3, and urea water is supplied from the urea water addition injector 8 in the middle of the mixing pipe 7B on the downstream side thereof.
  • urea water is supplied from the urea water addition injector 8 in the middle of the mixing pipe 7B on the downstream side thereof.
  • the exhaust gas 1 discharged from the outlet end portion of the particulate filter 3 is folded in the reverse direction by the connecting flow path 7 and then introduced into the inlet end portion of the adjacent selective catalytic reduction catalyst 4. Therefore, a long distance from the urea water addition position to the selective catalytic reduction catalyst 4 is secured, and a sufficient reaction time is secured for ammonia to be generated from the urea water.
  • the particulate filter 3 and the selective catalytic reduction catalyst 4 are arranged in parallel, and the communication flow path 7 is arranged between the particulate filter 3 and the selective catalytic reduction catalyst 4, so that the whole The configuration becomes compact, and the mountability to the vehicle is greatly improved.
  • Patent Document 1 Prior art document information relating to an exhaust gas purification apparatus in which this type of particulate filter 3 and selective reduction catalyst 4 are arranged in parallel and connected by an S-shaped connecting flow path 7 is disclosed in Patent Document 1 below. Etc.
  • urea water that cannot be completely vaporized forms a flow along the swirl flow ⁇ of the exhaust gas 1 along the inner peripheral surface of the mixing pipe 7B, as shown in FIG.
  • the constituent material upstream of the urea water addition position has only corrosion resistance against the exhaust gas components, the urea water that has flowed down to the particulate filter 3 side is highly corrosive in the process of being converted to ammonia. If ammonium carbide was produced, there was a concern that this ammonium carbide would induce rapid corrosion.
  • the present invention has been made in view of the above circumstances, and an object thereof is to prevent the urea water from flowing down from the opening formed at the inlet end of the mixing pipe to the upstream side.
  • the present invention relates to a selective reduction catalyst for reacting NOx contained in exhaust gas with ammonia, urea water addition means for adding urea water to the exhaust gas upstream from the selective reduction catalyst, and urea water addition means
  • a cylindrical mixing pipe that connects between the catalyst and the selective reduction catalyst, and an opening is formed at a circumferential position of the inlet side end of the mixing pipe, and exhaust gas is supplied to the opening.
  • a guide fin is disposed so as to be introduced from the tangential direction of the inlet side end portion to constitute a mixer structure, and the urea water addition means is provided so that urea water can be added into the swirling flow of exhaust gas by the mixer structure.
  • An exhaust emission control device disposed toward the outlet end side at the center position of the inlet end of the mixing pipe, wherein the opening is formed along the flow of the swirling flow. Is.
  • urea water that cannot be vaporized propagates along the swirling flow of the exhaust gas along the inner peripheral surface of the mixing pipe. Even if the flow is formed, the opening at the inlet side end of the mixing pipe is formed so as to follow the flow of the swirl flow, so that the urea water flow along the swirl flow flows along the opening. Since the flow does not form a flow that crosses a part of the opening, it is possible to prevent the urea water from flowing down from the opening to the upstream side.
  • a particulate filter is provided upstream of the urea water addition position by the urea water addition means, and the positional relationship between the outlet end face of the particulate filter and the opening at the inlet end of the mixing pipe Is preferably shifted in the axial direction of the mixing pipe so that the inflow angle of the exhaust gas that has passed through the particulate filter into the opening forms an acute angle with respect to the axial center of the mixing pipe.
  • the inflow angle of the exhaust gas that has passed through the particulate filter is reduced, and the vector of the flow of the exhaust gas when flowing into the opening is directed to the outlet side end side of the mixing pipe.
  • the swirling flow and the vector of the urea water flow along the swirling flow can be more strongly directed toward the outlet end side of the mixing pipe, whereby the urea water flow can easily exceed the opening.
  • the flow of urea water from the upstream side to the upstream side is further suppressed.
  • the angle formed between the inflow direction of the exhaust gas that has passed through the particulate filter and the spray direction of the urea water addition means becomes shallow, the influence of the exhaust gas flow on the spray of urea water is reduced.
  • the spray from the urea water addition means is blown by the flow of the exhaust gas, and the urea water directly hits the stagnation part deviating from the flow of the exhaust gas, and the urea water stays in the stagnation part and causes partial corrosion. Things are prevented beforehand.
  • the inflow angle of the exhaust gas that has passed through the particulate filter into the opening is reduced, and the vector of the flow of the exhaust gas when flowing into the opening is determined. Since it can be directed to the outlet side of the mixing pipe, the vector of the swirling flow and the flow of urea water along the swirling flow is more strongly directed toward the outlet side of the mixing pipe to easily exceed the opening. It is possible to more reliably prevent the flow from the opening to the upstream side.
  • the angle formed by the inflow direction of the exhaust gas to the opening and the spray direction of the urea water adding means is shallow, so that the flow of the exhaust gas is urea water. Since the influence on the spray can be reduced, the spray from the urea water addition means is swept by the flow of the exhaust gas, and the urea water directly hits the stagnation part that is out of the flow of the exhaust gas, and the urea part is struck by the urea part. It is possible to prevent a situation in which water stays as it is and causes partial corrosion.
  • FIG. 3 is a cross-sectional view taken along arrow III-III in FIG. 2. It is sectional drawing which shows an example of the form which implements this invention. It is sectional drawing which shows the structure of the entrance side edge part periphery of the mixing pipe of FIG. It is sectional drawing which shows another Example of this invention. It is sectional drawing which shows another Example of this invention.
  • FIGS. 1 to 3 show an example of an embodiment for carrying out the present invention, and portions denoted by the same reference numerals as those in FIGS. 1 to 3 represent the same items.
  • the opening 11 at the inlet end of the mixing pipe 7B in the exhaust gas purification apparatus configured in the same manner as described above with reference to FIGS. It is characterized in that it is formed along the flow of the swirling flow ⁇ of the exhaust gas 1 according to FIG.
  • the existing opening 11 was opened in a substantially simple rectangular shape, but as shown by a solid line in FIG. 11 is formed by being inclined by an angle X with respect to a direction parallel to the axial direction of the mixing pipe 7B (O in FIGS. 4 and 5 indicates the axial center of the mixing pipe 7B).
  • the positional relationship between the outlet end face of the particulate filter 3 and the opening 11 at the inlet end of the mixing pipe 7B is the axial center of the mixing pipe 7B.
  • the inflow angle ⁇ of the exhaust gas 1 that has passed through the particulate filter 3 into the opening 11 is formed with an acute angle with respect to the axis of the mixing pipe 7B.
  • the guide fins 12, 13, and 14 are omitted from the viewpoint of convenience of explanation.
  • the guide fins 12, 13, and 14 are arranged so that the exhaust gas 1 can be introduced into the opening 11 from the tangential direction.
  • the exhaust gas purification device is configured in this way, when the amount of urea water added is increased to improve NOx purification performance, urea water that cannot be vaporized is mixed along the swirl flow ⁇ of the exhaust gas 1. Even if the flow that travels along the inner peripheral surface of the pipe 7B is formed, the opening 11 at the inlet end of the mixing pipe 7B is formed along the flow of the swirling flow ⁇ . Therefore, the urea water flows along the opening 11 and does not form a flow that crosses a part of the opening 11. Therefore, the urea water flows from the opening 11 to the particulate filter 3 side (upstream side). Is prevented from flowing down.
  • the inflow angle ⁇ of the exhaust gas 1 that has passed through the particulate filter 3 into the opening 11 is configured to form an acute angle with respect to the axial center of the mixing pipe 7B. 3, the inflow angle ⁇ of the exhaust gas 1 into the opening 11 becomes small, and the vector of the flow of the exhaust gas 1 when flowing into the opening 11 becomes the outlet side end side of the mixing pipe 7B (the left side in FIG. 5) ).
  • the swirling flow ⁇ and the vector of the urea water flow along the swirling flow ⁇ can be more strongly directed toward the outlet end side of the mixing pipe 7B, so that the urea water flow exceeds the opening 11. As a result, the flow from the opening 11 to the particulate filter 3 side is further suppressed.
  • the angle formed by the flow direction of the exhaust gas 1 that has passed through the particulate filter 3 into the opening 11 and the spray direction of the urea water addition injector 8 becomes shallow, thereby Since the influence of the flow of the gas 1 on the spray of urea water is reduced, the spray from the urea water addition injector 8 is swept by the flow of the exhaust gas 1, and the stagnation portion 16 deviates from the flow of the exhaust gas 1. It is also possible to prevent a situation in which the water hits directly and the urea water stays in the stagnation portion 16 and causes partial corrosion.
  • the urea water that cannot be vaporized is along the swirl flow ⁇ of the exhaust gas 1 along the inner peripheral surface of the mixing pipe 7B. Can be prevented from flowing from the opening 11 at the inlet end of the mixing pipe 7B to the particulate filter 3 side, so that the urea water addition injector 8
  • the total amount of added urea water can be guided to the selective catalytic reduction catalyst as ammonia, so that the NOx purification performance and the control of the added amount of urea water can be maintained well, and the urea water that has flowed down to the particulate filter 3 side. It is also possible to prevent the occurrence of corrosion due to.
  • the flow angle of the exhaust gas 1 when flowing into the opening 11 is reduced by reducing the inflow angle ⁇ of the exhaust gas 1 that has passed through the particulate filter 3 into the opening 11, and the outlet side end side of the mixing pipe 7B. Therefore, the vector of the swirling flow ⁇ and the flow of urea water along the swirling flow ⁇ can be more strongly directed toward the outlet side end of the mixing pipe 7B, and the opening 11 can be easily exceeded. It is possible to more reliably prevent the flow from the opening 11 to the particulate filter 3 side.
  • the angle formed by the flow direction of the exhaust gas 1 into the opening 11 and the spray direction of the urea water addition injector 8 can be made shallow to reduce the influence of the flow of the exhaust gas 1 on the spray of urea water. Therefore, the spray from the urea water addition injector 8 is swept by the flow of the exhaust gas 1 so that the urea water directly hits the stagnation portion 16 which has deviated from the flow of the exhaust gas 1 and the urea water stays in the stagnation portion 16 as it is. Thus, it is possible to prevent a situation in which partial corrosion is caused.
  • FIG. 6 shows another embodiment of the present invention, and an angle deeper than the angle X at the end stage in which one side 11a of the opening 11 described in the embodiment of FIG. 4 is directed to the exit side of the mixing pipe 7B. Inclined at Y (an angle with respect to the direction parallel to the axial direction of the mixing pipe 7B). By doing so, the flow of urea water along the one side 11a of the opening 11 is further inclined at an angle Y. Since it can be smoothly connected and guided to the downstream side, it is possible to more reliably prevent the urea water from flowing down from the opening 11.
  • angle Y and angle Z (X ⁇ Y ⁇ Z) at the final stage where one side 11 a of the opening 11 is directed to the exit side of the mixing pipe 7 ⁇ / b> B. It is also possible to incline at an angle, or to incline in a stepwise manner by combining three or more angles, or to connect and incline with a continuous curve.
  • the exhaust emission control device of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

　排気ガス中に含まれるＮＯxをアンモニアと反応せしめる選択還元型触媒と、該選択還元型触媒より上流で排気ガス中に尿素水を添加する尿素水添加手段と、該尿素水添加手段から前記選択還元型触媒までの間を繋ぐ円筒状のミキシングパイプとを備え、該ミキシングパイプの入側端部の円周方向の位置に開口部を形成すると共に、該開口部に対し排気ガスを前記入側端部の接線方向から導入せしめるようガイドフィンを配設してミキサ構造を構成し、該ミキサ構造による排気ガスの旋回流内に尿素水を添加し得るように前記尿素水添加手段を前記ミキシングパイプの入側端部の中心位置に出側端部側へ向けて配設した排気浄化装置に関し、前記開口部を前記旋回流の流れに沿うように形成する。

Description

排気浄化装置
　本発明は、排気浄化装置に関するものである。
　近年、排気管の途中に排気ガス中のパティキュレートを捕集するパティキュレートフィルタを備えると共に、該パティキュレートフィルタの下流側に酸素共存下でも選択的にＮＯxをアンモニアと反応させ得る選択還元型触媒を備え、該選択還元型触媒と前記パティキュレートフィルタとの間に還元剤として尿素水を添加してパティキュレートとＮＯxの同時低減を図ることが考えられている。
　このようにする場合、選択還元型触媒への尿素水の添加がパティキュレートフィルタと選択還元型触媒との間で行われることになるため、排気ガス中に添加された尿素水がアンモニアと炭酸ガスに熱分解されるまでの十分な反応時間を確保しようとすれば、尿素水の添加位置から選択還元型触媒までの距離を長くする必要があるが、パティキュレートフィルタと選択還元型触媒とを十分な距離を隔てて離間配置させてしまうと、車両への搭載性が著しく損なわれるという不具合がある。
　そこで、図１に示す如く、エンジンからの排気ガス１が流通する排気管２の途中に、排気ガス１中のパティキュレートを捕集するパティキュレートフィルタ３と、該パティキュレートフィルタ３の下流側に酸素共存下でも選択的にＮＯxをアンモニアと反応させ得る性質を備えた選択還元型触媒４とをケーシング５，６により夫々抱持して並列に配置し、パティキュレートフィルタ３の出側端部と選択還元型触媒４の入側端部との間をＳ字構造の連絡流路７により接続し、パティキュレートフィルタ３の出側端部から排出された排気ガス１が逆向きに折り返されて隣の選択還元型触媒４の入側端部に導入されるようにした排気浄化装置が創案されるに到った。
　ここで、前記連絡流路７は、パティキュレートフィルタ３の出側端部を包囲し且つ該出側端部から出た直後の排気ガス１を略直角な向きに方向転換させつつ集合せしめるガス集合室７Ａと、該ガス集合室７Ａで集められた排気ガス１をパティキュレートフィルタ３の排気流れと逆向きに抜き出すミキシングパイプ７Ｂと、該ミキシングパイプ７Ｂにより導かれた排気ガス１を略直角な向きに方向転換させつつ分散せしめ且つその分散された排気ガス１を選択還元型触媒４の入側端部に導入し得るよう該入側端部を包囲するガス分散室７ＣとによりＳ字構造を成すように構成されており、前記ミキシングパイプ７Ｂの入側端部の中心位置には、該ミキシングパイプ７Ｂ内に尿素水を添加するための尿素水添加用インジェクタ８（尿素水添加手段）が前記ミキシングパイプ７Ｂの出側端部側へ向けて装備されている。
　尚、ここに図示している例では、パティキュレートフィルタ３が抱持されているケーシング５内の前段に、排気ガス１中の未燃燃料分を酸化処理する酸化触媒９が装備されており、また、選択還元型触媒４が抱持されているケーシング６内の後段には、余剰のアンモニアを酸化処理するアンモニア低減触媒１０が装備されている。
　そして、このような構成を採用すれば、パティキュレートフィルタ３により排気ガス１中のパティキュレートが捕集されると共に、その下流側のミキシングパイプ７Ｂの途中で尿素水添加用インジェクタ８から尿素水が排気ガス１中に添加されてアンモニアと炭酸ガスに熱分解され、選択還元型触媒４上で排気ガス１中のＮＯxがアンモニアにより良好に還元浄化される結果、排気ガス１中のパティキュレートとＮＯxの同時低減が図られることになる。
　この際、パティキュレートフィルタ３の出側端部から排出された排気ガス１が連絡流路７により逆向きに折り返されてから隣の選択還元型触媒４の入側端部に導入されるようになっているので、尿素水の添加位置から選択還元型触媒４までの距離が長く確保され、尿素水からアンモニアが生成されるのに十分な反応時間が確保される。
　しかも、パティキュレートフィルタ３と選択還元型触媒４とが並列に配置され、これらパティキュレートフィルタ３と選択還元型触媒４との間に沿うように連絡流路７が配置されているので、その全体構成がコンパクトなものとなって車両への搭載性が大幅に向上されることになる。
　尚、この種のパティキュレートフィルタ３と選択還元型触媒４とを並列に配置してＳ字構造の連絡流路７により連結した排気浄化装置に関連する先行技術文献情報としては下記の特許文献１等がある。
特開２００８－２１５２８６号公報
　しかしながら、先の特許文献１にも開示されている通り、尿素水添加用インジェクタ８により尿素水が添加される箇所には、図２に示す如き円筒状のミキシングパイプ７Ｂにおける入側端部の開口部１１に対しガス集合室７Ａからの排気ガス１をガイドフィン１２，１３，１４により接線方向から導入せしめ、これにより排気ガス１に旋回流を与えるミキサ構造１５が採用されており、この旋回流の中心に尿素水添加用インジェクタ８から尿素水の添加を行うことで該尿素水の排気ガス１に対する混合性を高めるようにしていたため、これまで以上のＮＯx浄化性能を求めて尿素水の添加量を増大させた場合に、図３に示す如く、気化しきれない尿素水が前記排気ガス１の旋回流αに沿いミキシングパイプ７Ｂの内周面を伝う流れを形成し、この尿素水の流れが前記開口部１１の一部を横切るように流れて該開口部１１からパティキュレートフィルタ３側へ流れ落ちる虞れがあった。
　即ち、尿素水の一部が開口部１１からパティキュレートフィルタ３側へ流れ落ちてしまうと、尿素水添加用インジェクタ８から添加した尿素水の全量がアンモニアとして選択還元型触媒４へ導かれないことになり、ＮＯx浄化性能や尿素水の添加量制御に悪影響を及ぼすことが懸念された。
　また、尿素水の添加位置より上流側の構成素材には、排ガス成分に対する耐食性しか備えられていないため、パティキュレートフィルタ３側へ流れ落ちてしまった尿素水がアンモニアに転化する過程で腐食性の高いアンモニウムカーバイトを生成してしまうと、このアンモニウムカーバイトにより進行の早い腐食が誘発される懸念もあった。
　本発明は上述の実情に鑑みてなしたもので、ミキシングパイプの入側端部に形成した開口部から上流側への尿素水の流れ落ちを防止することを目的としている。
　本発明は、排気ガス中に含まれるＮＯxをアンモニアと反応せしめる選択還元型触媒と、該選択還元型触媒より上流で排気ガス中に尿素水を添加する尿素水添加手段と、該尿素水添加手段から前記選択還元型触媒までの間を繋ぐ円筒状のミキシングパイプとを備え、該ミキシングパイプの入側端部の円周方向の位置に開口部を形成すると共に、該開口部に対し排気ガスを前記入側端部の接線方向から導入せしめるようガイドフィンを配設してミキサ構造を構成し、該ミキサ構造による排気ガスの旋回流内に尿素水を添加し得るように前記尿素水添加手段を前記ミキシングパイプの入側端部の中心位置に出側端部側へ向けて配設した排気浄化装置であって、前記開口部を前記旋回流の流れに沿うように形成したことを特徴とするものである。
　而して、このようにすれば、ＮＯx浄化性能を高めるべく尿素水の添加量を増大させた場合に、気化しきれない尿素水が排気ガスの旋回流に沿いミキシングパイプの内周面を伝う流れを形成しても、ミキシングパイプの入側端部における開口部は、前記旋回流の流れに沿うように形成されているので、この旋回流に沿う尿素水の流れが前記開口部に沿って流れ、該開口部の一部を横切るような流れを形成しないため、該開口部から上流側への尿素水の流れ落ちが未然に防止される。
　また、本発明においては、尿素水添加手段による尿素水の添加位置より上流側にパティキュレートフィルタを備え、該パティキュレートフィルタの出側端面とミキシングパイプの入側端部における開口部との位置関係を前記ミキシングパイプの軸心方向にずらし、前記パティキュレートフィルタを経た排気ガスの前記開口部への流入角度が前記ミキシングパイプの軸心に対し鋭角を成すように構成することが好ましい。
　このようにすれば、パティキュレートフィルタを経た排気ガスの開口部への流入角度が小さくなり、該開口部に流れ込む際における排気ガスの流れのベクトルがミキシングパイプの出側端部側に向けられるので、旋回流及び該旋回流に沿う尿素水の流れのベクトルをより強くミキシングパイプの出側端部側に向けることが可能となり、これにより尿素水の流れが開口部を超え易くなって該開口部から上流側への尿素水の流れ落ちが更に抑制されることになる。
　しかも、パティキュレートフィルタを経た排気ガスの開口部への流入方向と尿素水添加手段の噴霧方向とが成す角度が浅くなることによって、排気ガスの流れが尿素水の噴霧に与える影響が少なくなるため、尿素水添加手段からの噴霧が排気ガスの流れに煽られて該排気ガスの流れから外れた澱み部に尿素水が直撃し且つ該澱み部に尿素水がそのまま滞留して部分腐食を招くといった事態が未然に防止される。
　上記した本発明の排気浄化装置によれば、下記の如き種々の優れた効果を奏し得る。
　（Ｉ）本発明の請求項１に記載の発明によれば、ＮＯx浄化性能を高めるべく尿素水の添加量を増大させた場合に、気化しきれない尿素水が排気ガスの旋回流に沿いミキシングパイプの内周面を伝う流れを形成しても、ミキシングパイプの入側端部における開口部から上流側への尿素水の流れ落ちを未然に防止することができるので、尿素水添加手段から添加した尿素水の全量をアンモニアとして選択還元型触媒へ導くことができてＮＯx浄化性能や尿素水の添加量制御を良好に維持することができ、また、上流側へ流れ落ちた尿素水に起因する腐食の発生を防止することもできる。
　（ＩＩ）本発明の請求項２に記載の発明によれば、パティキュレートフィルタを経た排気ガスの開口部への流入角度を小さくして、該開口部に流れ込む際における排気ガスの流れのベクトルをミキシングパイプの出側端部側に向けることができるので、旋回流及び該旋回流に沿う尿素水の流れのベクトルをより強くミキシングパイプの出側端部側に向かわせて開口部を超え易くさせることができ、該開口部から上流側への流れ落ちを更に確実に防止することができる。
　（ＩＩＩ）本発明の請求項２に記載の発明によれば、開口部への排気ガスの流入方向と尿素水添加手段の噴霧方向とが成す角度を浅くして排気ガスの流れが尿素水の噴霧に与える影響を少なくすることができるので、尿素水添加手段からの噴霧が排気ガスの流れに煽られて該排気ガスの流れから外れた澱み部に尿素水が直撃し且つ該澱み部に尿素水がそのまま滞留して部分腐食を招くといった事態を未然に防止することができる。
従来の排気浄化装置の一例を示す平面図である。 図１の要部の詳細を示す断面図である。 図２のＩＩＩ－ＩＩＩ矢視の断面図である。 本発明を実施する形態の一例を示す断面図である。 図４のミキシングパイプの入側端部周辺の構造を示す断面図である。 本発明の別の実施例を示す断面図である。 本発明の更に別の実施例を示す断面図である。
　以下本発明の実施の形態を図面を参照しつつ説明する。
　図４及び図５は本発明を実施する形態の一例を示すもので、図１～図３と同一の符号を付した部分は同一物を表わしている。
　図４に示す如く、本実施例においては、先に図１～図３で説明したものと同様に構成した排気浄化装置におけるミキシングパイプ７Ｂの入側端部の開口部１１を、ミキサ構造１５（図２参照）による排気ガス１の旋回流αの流れに沿うように形成したところを特徴としている。
　即ち、図４中に二点鎖線で示す如く、既存の開口部１１は、概ね単純な矩形状に開口していたが、図４中に実線で示す如く、旋回流αに沿うように開口部１１の一辺１１ａをミキシングパイプ７Ｂの軸心方向（図４及び図５中のＯがミキシングパイプ７Ｂの軸心を示す）と平行な向きに対し角度Ｘだけ傾斜させて形成している。
　また、図５に示す如く、特に本実施例の場合には、パティキュレートフィルタ３の出側端面とミキシングパイプ７Ｂの入側端部における開口部１１との位置関係を前記ミキシングパイプ７Ｂの軸心方向にずらし、前記パティキュレートフィルタ３を経た排気ガス１の前記開口部１１への流入角度θが前記ミキシングパイプ７Ｂの軸心に対し鋭角を成すように構成している。
　尚、図４及び図５においては、説明の便宜を図る観点からガイドフィン１２，１３，１４（図２参照）の図示を省略しているが、先に図１～図３で説明した通り、開口部１１に対し排気ガス１を接線方向から導入し得るようにガイドフィン１２，１３，１４（図２参照）が配置されることは勿論である。
　而して、このように排気浄化装置を構成すれば、ＮＯx浄化性能を高めるべく尿素水の添加量を増大させた場合に、気化しきれない尿素水が排気ガス１の旋回流αに沿いミキシングパイプ７Ｂの内周面を伝う流れを形成しても、ミキシングパイプ７Ｂの入側端部における開口部１１は、前記旋回流αの流れに沿うように形成されているので、この旋回流αに沿う尿素水の流れが前記開口部１１に沿って流れ、該開口部１１の一部を横切るような流れを形成しないため、該開口部１１からパティキュレートフィルタ３側（上流側）への尿素水の流れ落ちが未然に防止される。
　しかも、特に本実施例においては、パティキュレートフィルタ３を経た排気ガス１の開口部１１への流入角度θがミキシングパイプ７Ｂの軸心に対し鋭角を成すように構成されているので、パティキュレートフィルタ３を経た排気ガス１の開口部１１への流入角度θが小さくなり、該開口部１１に流れ込む際における排気ガス１の流れのベクトルがミキシングパイプ７Ｂの出側端部側（図５中の左側）に向けられることになる。
　この結果、旋回流α及び該旋回流αに沿う尿素水の流れのベクトルをより強くミキシングパイプ７Ｂの出側端部側に向けることが可能となり、これにより尿素水の流れが開口部１１を超え易くなって該開口部１１からパティキュレートフィルタ３側への流れ落ちが更に抑制されることになる。
　しかも、パティキュレートフィルタ３を経た排気ガス１の開口部１１への流入方向と尿素水添加用インジェクタ８の噴霧方向（図５中の鎖線矢印を参照）とが成す角度が浅くなることによって、排気ガス１の流れが尿素水の噴霧に与える影響が少なくなるため、尿素水添加用インジェクタ８からの噴霧が排気ガス１の流れに煽られて該排気ガス１の流れから外れた澱み部１６に尿素水が直撃し且つ該澱み部１６に尿素水がそのまま滞留して部分腐食を招くといった事態が未然に防止されることにもなる。
　従って、上記実施例によれば、ＮＯx浄化性能を高めるべく尿素水の添加量を増大させた場合に、気化しきれない尿素水が排気ガス１の旋回流αに沿いミキシングパイプ７Ｂの内周面を伝う流れを形成しても、ミキシングパイプ７Ｂの入側端部における開口部１１からパティキュレートフィルタ３側への尿素水の流れ落ちを未然に防止することができるので、尿素水添加用インジェクタ８から添加した尿素水の全量をアンモニアとして選択還元型触媒へ導くことができてＮＯx浄化性能や尿素水の添加量制御を良好に維持することができ、また、パティキュレートフィルタ３側へ流れ落ちた尿素水に起因する腐食の発生を防止することもできる。
　また、パティキュレートフィルタ３を経た排気ガス１の開口部１１への流入角度θを小さくして、該開口部１１に流れ込む際における排気ガス１の流れのベクトルをミキシングパイプ７Ｂの出側端部側に向けることができるので、旋回流α及び該旋回流αに沿う尿素水の流れのベクトルをより強くミキシングパイプ７Ｂの出側端部側に向かわせて開口部１１を超え易くさせることができ、該開口部１１からパティキュレートフィルタ３側への流れ落ちを更に確実に防止することができる。
　更に、開口部１１への排気ガス１の流入方向と尿素水添加用インジェクタ８の噴霧方向とが成す角度を浅くして排気ガス１の流れが尿素水の噴霧に与える影響を少なくすることができるので、尿素水添加用インジェクタ８からの噴霧が排気ガス１の流れに煽られて該排気ガス１の流れから外れた澱み部１６に尿素水が直撃し且つ該澱み部１６に尿素水がそのまま滞留して部分腐食を招くといった事態を未然に防止することができる。
　図６は本発明の別の実施例を示すもので、先の図４の実施例中で説明した開口部１１の一辺１１ａをミキシングパイプ７Ｂの出側へ向けた終盤で角度Ｘより更に深い角度Ｙ（ミキシングパイプ７Ｂの軸心方向と平行な向きに対する角度）で傾斜させたものであり、このようにすれば、開口部１１の一辺１１ａに沿う尿素水の流れを更なる角度Ｙの傾斜により円滑に受け繋いで下流側へ導くことができるので、開口部１１からの尿素水の流れ落ちをより一層確実に防止することができる。
　また、図７に本発明の更に別の実施例を示す如く、開口部１１の一辺１１ａをミキシングパイプ７Ｂの出側へ向けた終盤で角度Ｙ、角度Ｚ（Ｘ＜Ｙ＜Ｚ）の二段階で傾斜させるようにしても良く、更には、三段階以上の角度を複合させて段階的に傾斜させるようにしたり、或いは、連続的な曲線で繋いで傾斜させるようにしても良い。
　尚、本発明の排気浄化装置は、上述の実施例にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。
　　１  排気ガス
　　３  パティキュレートフィルタ
　　４  選択還元型触媒
　　７Ｂ  ミキシングパイプ
　　８  尿素水添加用インジェクタ（尿素水添加手段）
　１１  開口部
　１２  ガイドフィン
　１３  ガイドフィン
　１４  ガイドフィン
　１５  ミキサ構造
　　α  旋回流
　　θ  流入角度

Claims (2)

  1. 　排気ガス中に含まれるＮＯxをアンモニアと反応せしめる選択還元型触媒と、該選択還元型触媒より上流で排気ガス中に尿素水を添加する尿素水添加手段と、該尿素水添加手段から前記選択還元型触媒までの間を繋ぐ円筒状のミキシングパイプとを備え、該ミキシングパイプの入側端部の円周方向の位置に開口部を形成すると共に、該開口部に対し排気ガスを前記入側端部の接線方向から導入せしめるようガイドフィンを配設してミキサ構造を構成し、該ミキサ構造による排気ガスの旋回流内に尿素水を添加し得るように前記尿素水添加手段を前記ミキシングパイプの入側端部の中心位置に出側端部側へ向けて配設した排気浄化装置であって、前記開口部を前記旋回流の流れに沿うように形成した排気浄化装置。
  2. 　尿素水添加手段による尿素水の添加位置より上流側にパティキュレートフィルタを備え、該パティキュレートフィルタの出側端面の位置と、ミキシングパイプの入側端部における開口部の位置とを前記ミキシングパイプの軸心方向にずらし、前記パティキュレートフィルタを経た排気ガスの前記開口部への流入角度が前記ミキシングパイプの軸心に対し鋭角を成すように構成した請求項１に記載の排気浄化装置。
PCT/JP2010/007399 2009-12-24 2010-12-21 排気浄化装置 WO2011077703A1 (ja)

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