CN102242670A

CN102242670A - Large-sized two-stroke diesel engine having exhaust gas purifying system

Info

Publication number: CN102242670A
Application number: CN2011101202100A
Authority: CN
Inventors: 皮特·斯柯达哥
Original assignee: MAN Diesel Filial af MAN Diesel SE
Current assignee: MAN Energy Solutions Filial af MAN Energy Solutions SE
Priority date: 2010-05-10
Filing date: 2011-05-10
Publication date: 2011-11-16
Anticipated expiration: 2031-05-10
Also published as: DK201000409A; JP2011236892A; KR101400832B1; JP2014196745A; CN103216298A; JP5581259B2; KR20110124133A; DK177631B1; JP5860923B2; CN103216298B; CN102242670B

Abstract

The invention relates to a crosshead type large-sized turbocharging two-stroke internal combustion engine, which comprises a plurality of cylinders. Each cylinder is connected to an exhaust gas receiver. A selective catalytic reduction reactor is arranged on the downstream of the exhaust gas receiver. The outlet of the selective catalytic reduction reactor is connected to a turbine of a turbocharger through an exhaust pipe. The turbine drives a compressor of the turbocharger. The compressor sends scavenging air through a scavenging air path to a scavenging air receiver which is connected to the plural cylinders. An auxiliary blower on the scavenging air path assists the compressor in a low-load condition. A controllable bypass pipeline extends from the scavenging air receiver to the exhaust pipe. In a low engine load condition, controlled scavenging air flow is guided from the scavenging air receiver to an exhaust pipe part located on the downstream of the selective catalytic reduction reactor and the upstream of the turbine of the turbocharger. The above-mentioned measure makes the temperature of the exhaust gas entering the selective catalytic reduction reactor increased.

Description

Large-sized two-stroke diesel engine with waste gas cleaning system

Technical field

The present invention relates to a kind of large-sized turbo-charging two-stroke internal combustion reciprocating engine of crosshead, preferably relate to a kind of diesel engine, relate in particular to a kind of crosshead type large two-stroke diesel engine with scr reactor with waste gas cleaning system.

Background technique

The large-sized two-stroke motor of crosshead is generally used for the propulsion system of large vessel or as the prime mover in the power plant.Emissions requirements and will be difficult to more satisfy, especially about single nitrogen oxide (NO _x) level.

Using selective catalytic reduction (SCR) reactor is that the known auxiliary diesel engine that is used for reduces NO _xThe measure of discharging.The minimum temperature that requirement enters the waste gas of SCR converter is about 300 to 350 ℃, so that the SCR reactor normally moves.

But because the characteristic of two-stroke turbosupercharged engine, the exhaust gas temperature under the low engine loading (for example be lower than the continous maximum rating relevant with motor 40%) is relatively low, that is, too low and can't be transformed in the SCR reactor for waste gas.

Under above-mentioned low loading condition, be difficult in the large-sized turbo-charging two-stroke diesel engine, keep enough scavenging pressures.Therefore, under so low loading condition, use auxiliary blower to keep scavenging pressure.Thereby, should not cause negative effect to scavenging pressure in order to increase any method that SCR reactor suction port place exhaust gas temperature taked.

Therefore, need a kind of turbosupercharging two-stroke diesel engine that overcomes above-mentioned defective or reduce above-mentioned defective at least.

Summary of the invention

Under this background, an object of the present invention is to provide a kind of large-sized turbo-charging two-stroke diesel engine that can under large-scale engine load conditions, operate with the SCR reactor.

By providing a kind of crosshead type large turbosupercharging two stroke IC engine to realize above-mentioned purpose, this internal-combustion engine comprises: a plurality of cylinders, and each cylinder is connected to the waste gas receiver; Scr reactor, its inlet is connected to the outlet of waste gas receiver; Outlet pipe, its outlet with scr reactor is connected to the turbo machine of turbosupercharger; The compressor of turbosupercharger is by this turbine drives, and this compressor is sent to the scavenging receiver with scavenging via the scavenging path that comprises the scavenging cooler; Auxiliary blower, it is used for auxiliary this compressor under low loading condition in this scavenging path; This scavenging receiver is connected to each cylinder in a plurality of cylinders; Controlled by-pass line, position in its this auxiliary blower downstream from the scavenging path or extend to this outlet pipe a position between the inlet of the outlet of this scr reactor and this turbo machine from this scavenging receiver; ECU (Electrical Control Unit), it may be operably coupled to this by-pass line, this ECU (Electrical Control Unit) is configured to when engine loading is lower than predetermined threshold value or when the temperature of the waste gas that enters this scr reactor is lower than given threshold value, allows scavenging stream to flow to outlet pipe from the scavenging receiver by controlled by-pass line.

Under low load, controlled scavenging stream is guided to the outlet pipe of position of upstream of the turbo machine of the downstream that is arranged in scr reactor and turbosupercharger from the scavenging receiver.This measure increases the temperature of the waste gas that enters scr reactor, and does not influence scavenging pressure negatively.

This outlet pipe can comprise and is used for the three port hybrid point that the scavenging with bypass mixes with waste gas.

This by-pass line can comprise valve, and it is used to control scavenging flowing by this by-pass line.

This valve can be the on-off type electrically-controlled valve of being controlled by ECU (Electrical Control Unit) 33 in the open loop.

Replacedly, this valve can be the proportional-type electrically-controlled valve of being controlled by ECU (Electrical Control Unit) in the closed loop.

Motor also can comprise the temperature transducer of the inlet that is close in scr reactor.

Configurable this motor, making can be by the inactive scavenging cooler of this ECU (Electrical Control Unit).

This ECU (Electrical Control Unit) can be configured to and will open this by-pass line as first measure, and this scavenging cooler of will stopping using is as second measure.

Can dispose this motor, make and to change this scavenging cooler into heater by this ECU (Electrical Control Unit).

Can dispose this motor, make that this ECU (Electrical Control Unit) is configured to make this scavenging cooler change heater into as the 3rd measure.

Purpose of the present invention can also realize that this internal-combustion engine comprises by a kind of crosshead type large turbosupercharging two stroke IC engine is provided: a plurality of cylinders, and each cylinder is connected to the waste gas receiver; Scr reactor, its inlet is connected to the outlet of waste gas receiver; Outlet pipe, its outlet with scr reactor is connected to the turbo machine in the turbosupercharger; The compressor of this turbosupercharger is by this turbine drives, and this compressor is sent to the scavenging receiver with scavenging via the scavenging path that comprises the scavenging cooler; Auxiliary blower, it is used for auxiliary this compressor under low loading condition in this scavenging path; This scavenging receiver is connected to each cylinder in a plurality of cylinders; ECU (Electrical Control Unit) is configured at engine loading during less than given threshold value or when the temperature of the waste gas that enters this scr reactor is lower than given threshold value, reduces or the refrigerating function of this scavenging cooler of stopping using.

This motor can also comprise the scavenging by-pass pipe that is used to walk around the scavenging cooler.

This motor can also comprise one or more electrically-controlled valve of the command control that is subjected to ECU (Electrical Control Unit), is used to control scavenging flowing by this scavenging by-pass pipe.

This motor can also comprise cooling medium supplying pipe, cooling medium reflow pipe with automatically controlled seperating vale and the cooling medium bypass circuit that comprises automatically controlled by-pass valve.This motor can also comprise recirculation pipe and recirculating pump.This motor can also be included in the heat exchanger in this recirculation pipe, is used to heat the medium that flows through this recirculation pipe.

This motor can also comprise the second scavenging cooler, and wherein this ECU (Electrical Control Unit) is configured to control in the scavenging cooler cooling capacity of at least one.

This motor can also comprise the steam ascending pipe that is connected to the scavenging path, and this steam ascending pipe comprises the automatically controlled steam injection control valve of the command control that is subjected to ECU (Electrical Control Unit).

This motor can also comprise the waste gas ascending pipe that is connected to the scavenging path, and this waste gas ascending pipe comprises the automatically controlled waste gas injection control valve of the command control that is subjected to ECU (Electrical Control Unit).

This motor can also be included in the unit heater in the scavenging path.Can operate this unit heater as heat medium with hot air.

This motor can also be included in the heat exchanger in the cooling medium supplying pipe, is used for heat is supplied to the medium that flows through this cooling medium supplying pipe.

Further purpose, feature, advantage and character according to large-sized two-stroke explosive motor of the present invention will become obvious by specific descriptions.

Description of drawings

In the following concrete part of this specification, the exemplary embodiment shown in is explained the present invention in more detail with reference to the accompanying drawings, wherein:

Fig. 1 is the graphical diagram according to the motor of first embodiment of the invention;

Fig. 2 shows the graphical diagram of second embodiment of the invention;

Fig. 3 to Fig. 7 shows more embodiments of the minimizing cooling that has utilized scavenging; And

Fig. 8 to Figure 12 shows more embodiments of the active heating that has utilized scavenging.

Embodiment

In the following detailed description, will describe according to crosshead type large turbosupercharging two-stroke diesel engine of the present invention and the method that is used to operate crosshead type large turbosupercharging two-stroke diesel engine by exemplary embodiment.

The structure and the operation of crosshead type large turbosupercharging two-stroke diesel engine are well-known, therefore do not need further to explain in this article.Detailed description about the operation of waste gas cleaning system is provided below.

Fig. 1 shows first exemplary embodiment according to large-sized two-stroke diesel engine 1 of the present invention.Motor 1 can be for example as the master motor in the ocean going vessel or as the stationary engine that moves generator in the power station.Total output of motor can be for example in 5000 to 110000kW scope.

Motor 1 is provided with a plurality of cylinders, and described a plurality of cylinders side by side are in line.Each cylinder is provided with the outlet valve that is associated with its cylinder head.Can open and close exhaust pathway by this outlet valve.The crosshead of motor is connected to piston rod in the major part of bent axle.Exhaust elbow is connected to waste gas receiver 6.Waste gas receiver 6 is set to parallel with the delegation cylinder.Waste gas receiver 6 is bulk containers, and its size is particularly suitable for engine characteristics, is used for the consideration of best air-flow, back-pressure and acoustics.Usually, waste gas receiver 6 is big hollow circular cylinders of being made by steel plate.Because its size and volume are bigger, for the purpose of vibration processing aspect, the waste gas receiver are suspended on the engine structure.

The outlet of exhaust flow from waste gas receiver 6 guided to the turbo machine 12 of turbosupercharger via selective catalytic reactor 8 (SCR reactor) and outlet pipe 10.Therefore, the outlet of waste gas receiver 6 is connected to the inlet of SCR reactor 8.Exhaust flow removes the NOx in the waste gas or has reduced the NOx amount in the waste gas at least substantially through SCR reactor 8, and NOx is converted into nitrogen and oxygen.The outlet of SCR reactor is connected to outlet pipe 10, and this outlet pipe 10 causes turbo machine 12 with the waste gas of heat and pressurization.Waste gas is discharged into the atmosphere downstream of turbo machine 12.

Turbosupercharger also comprises by turbo machine 12 compressor driven 14.Compressor 14 is connected to air inlet.Compressor 14 is sent to scavenging receiver 22 with the scavenging of pressurization via scavenging flow path 16, and this scavenging flow path 16 comprises scavenging cooler 18 and auxiliary blower 20.

Move scavenging cooler 18 with water as cooling medium.Scavenging cooler 18 can be all kinds.A kind of may be panel cooler, and wherein cooling medium does not directly contact with scavenging physics.Another kind may be washing machine (scrubber), and wherein cooling medium directly contacts with scavenging.

Auxiliary blower 20 is started working by electrical motor driven (also can by fluid motor-driven) and under low loading condition (be usually less than continous maximum rating 40%) usually, so that compressor 14 keeps enough scavenging pressures.When not using auxiliary blower, it is walked around by unshowned bypass.

Scavenging receiver 22 is the elongate hollow cylindrical bodys along the cylinder extension of motor.Scavenging stream arrives the scavenging port of each cylinder from scavenging receiver 22.

Controlled by-pass line 26 is from scavenging receiver 22 beginning branches.The other end of controlled by-pass line 26 is put 30 places in three port hybrid and is connected with outlet pipe 10.Mixing point 30 is positioned at the downstream of SCR reactor 8 outlets and the upstream of turbo machine 12 inlets.

Replacedly, the starting point of controlled by-pass line 26 can be arranged in scavenging air pipe 16 auxiliary blowers 20 location downstream.

Under the instruction of ECU (Electrical Control Unit) 33, electrically-controlled valve 28 is regulated from scavenging flow path 16 to outlet pipe flowing of 10 scavenging.In one embodiment, valve 28 is on/off-type valves of being controlled by ECU (Electrical Control Unit) 33 in the open loop.In this embodiment, ECU (Electrical Control Unit) 33 is configured to drop to predetermined threshold at engine loading and opens valve 28 when following and be elevated to predetermined threshold cut-off valve 28 when above at engine loading.These two threshold values needn't be identical and can be defined as the percentage of the continous maximum rating that accounts for motor.

In another embodiment, electrically-controlled valve 28 is Proportional valves of being controlled by ECU (Electrical Control Unit) 33 in the closed loop.Here, the information that controller receives about the exhaust gas temperature of SCR reactor 8 ingress from temperature transducer 35, and ECU (Electrical Control Unit) 33 is configured to respond the opening degree that the exhaust gas temperature that enters SCR reactor 8 that records is come control valve 28.Therefore, when the temperature that records is lower than minimum preferred temperature, ECU (Electrical Control Unit) 33 will increase the opening degree of electrically-controlled valve 28 to increase exhaust gas temperature.

This threshold value also can be controlled by the mixing temperature at turbine inlet place, that is, when the temperature temperature more required than SCR reactor 8 was high, by-pass line 26 was closed, and when the temperature temperature more required than SCR reactor 8 was almost much lower, by-pass line 26 was opened.

After the mixing temperature at default turbine inlet place, control the ON/OFF bypass in the mode similar to described load control.

Fig. 2 shows second exemplary embodiment according to large-sized two-stroke diesel engine 1 of the present invention.The reference character identical with Fig. 1 refers to identical parts.The following aspect of the scavenging cooler 18 in scavenging path 16, all identical with embodiment's major part of Fig. 1 according to the embodiment of Fig. 2.

Cold water is sent to scavenging cooler 18 to supplying pipe 40 and reflow pipe 42 is transported away warm water from scavenging cooler 18.In a second embodiment, the automatically controlled by-pass valve in the cooling medium bypass circuit 43 44 and act on automatically controlled seperating vale 46 under the instruction of controller 33 and make the cold water in the supplying pipe 40 can obstructed overscan gas cooler 18 and depart from and be fed in the reflow pipe 42.The recirculation pipe 48 that comprises pump 50 and heater (or heat exchanger) 52 guarantees that water flows by scavenging cooler 18, and scavenging this moment cooler 18 becomes heater and is used as heat exchanger effectively.Heater 52 is provided with the heat medium of temperature, for example constitutes the warm water of engine-cooling system, and the medium that cycles through scavenging cooler 18 is heated.

In a second embodiment, ECU (Electrical Control Unit) 33 can not work cooler 18 by via

valve

44 and 46 the cooling medium bypass being walked around.Simultaneously, controller 33 will activate pump 50 and circulate in scavenging cooler 18 to guarantee medium.In addition, control unit 33 can activate heater 52 by heat medium being sent to heater 52, thereby scavenging cooler 18 is become heater.ECU (Electrical Control Unit) 33 is configured to adopt various measures to increase the scavenging temperature according to the demand that increase enters the exhaust gas temperature of SCR reactor 8.

Therefore, if it is just enough to make some scavengings enter outlet pipe 10 by controlled by-pass line 26, ECU (Electrical Control Unit) 33 will not taked any further measure.But, if this first measure is not enough, ECU (Electrical Control Unit) 33 refrigerating function of scavenging cooler 18 of will stopping using so.If this second measure is not enough, as the 3rd measure, ECU (Electrical Control Unit) 33 will change scavenging cooler 18 into heater initiatively to heat scavenging.

Fig. 2 shows the example of the temperature of the scavenging of a plurality of positions in the system and waste gas.These examples are used for low engine loading situation, for example are lower than 40% of the continous maximum rating relevant with flourishing machine.Not parenthesized numeral is by by-pass line 26 and in the temperature of the scavenging cooler heated scavenging in 18 places.Numeral in the bracket is not make scavenging by by-pass line 26 and the temperature when making scavenging cooler 18 cooling scavengings operating motor routinely.When adopting new measure, the exhaust gas temperature that enters SCR reactor 8 is 325 ℃, and waste gas is warm and can being transformed in SCR reactor 8 enough.When not adopting new measure, the exhaust gas temperature that enters SCR reactor 8 is 220 ℃, and waste gas is warm and can not being transformed in SCR reactor 8 inadequately.

Fig. 3 shows cooling medium and is supplied to scavenging cooler 18 and is back to scavenging cooler 18 via cooling medium reflow pipe 42 via cooling medium supplying pipe 40.

Fig. 4 to Fig. 7 shows the various embodiments of controlled minimizing of the cooling capacity of scavenging cooler 18.

In Fig. 4, motor is provided with the scavenging by-pass pipe 17 that is used to walk around scavenging cooler 18.Scavenging by-pass pipe 17 comprises the electrically-controlled valve 23 that is used for opening and closing scavenging by-pass pipe 17 under the instruction of ECU (Electrical Control Unit) 33.Scavenging path 16 comprises another electrically-controlled valve 21 that is used for opening and closing scavenging path 16 under the instruction of ECU (Electrical Control Unit) 33.Therefore, ECU (Electrical Control Unit) 33 can be controlled flowing of scavenging by described scavenging by-pass pipe 17 according to the needs that increase the scavenging temperature, thereby increases the exhaust gas temperature that enters SCR reactor 8.

In Fig. 5, cooling medium supplying pipe 40 is provided with automatically controlled seperating vale 46 and cooling medium bypass circuit 43, and this cooling medium bypass circuit 43 comprises automatically controlled by-pass valve 44 and cooling medium supplying pipe 40 is connected directly to cooling medium reflow pipe 42.33 pairs of electronic valves of ECU (Electrical Control Unit) 44 and 46 send instruction, thereby can control the degree (can be ON/OFF or proportional control) of cooling medium by scavenging cooler 18.

In Fig. 6, comprise that the recirculation pipe 48 of recirculating pump (being subjected to the control of ECU (Electrical Control Unit) 33) is added among the embodiment shown in Figure 5, be used for making cooling medium to circulate at scavenging cooler 18.

In Fig. 7, motor is provided with additional (second) scavenging cooler 19.ECU (Electrical Control Unit) 33 is configured to control at least one the cooling capacity in the

aforesaid scavenging cooler

18,19.

Fig. 8 to Figure 12 shows the various embodiments that controllably heat is added in the scavenging.

In Fig. 8, motor is provided with the steam ascending pipe 50 that is connected to scavenging path 16.Steam ascending pipe 90 comprises the automatically controlled steam injection control valve 92 that is subjected to ECU (Electrical Control Unit) 33 command control.Therefore,, can undesirably increase the scavenging temperature, thereby increase the temperature of the waste gas enter SCR reactor 8 and do not reduce scavenging pressure by controllably injecting steam.

In Fig. 9, motor is provided with the waste gas ascending pipe 60 that is connected to scavenging path 16.Described waste gas ascending pipe 60 comprises the automatically controlled waste gas injection control valve 62 that is subjected to ECU (Electrical Control Unit) 33 command control.Therefore,, can undesirably increase the scavenging temperature, thereby increase the temperature of the waste gas enter SCR reactor 8 and do not reduce scavenging pressure by controllably injecting waste gas.

In Figure 10, motor is provided with unit heater 27 in scavenging path 16.Heat medium (for example hot water or hot air) is supplied to unit heater 27 via heat medium supplying pipe 70, and the heat medium that refluxes is transmitted by heat medium reflow pipe 72.Heat medium supplying pipe 70 and heat medium reflow pipe 72 are provided with the electrically-controlled valve that is subjected to ECU (Electrical Control Unit) 33 command control.Therefore, can undesirably increase the temperature of scavenging temperature, thereby increase the temperature of the waste gas enter SCR reactor 8 and do not reduce scavenging pressure.

The embodiment of Figure 11 and the embodiment of Fig. 6 are basic identical, but also comprise the heat exchanger that is used for heat is added the medium that cycles through scavenging cooler 18.

In the embodiment of Figure 12, motor is provided with heat exchanger 80 in cooling medium supplying pipe 40, is used for heat is supplied to the medium of the cooling medium supplying pipe 40 of flowing through.

Though specifically described the application's instruction for illustrative purpose, it should be understood that these details only are used for illustrative purpose, those skilled in the art can make various variations to it in the scope of the instruction that does not break away from the application.

The foregoing description can make up to improve the function of motor in any possible mode.

Should also be noted that: exist multiple replaceable mode to implement the equipment of instruction of the present invention.

Employed term " comprises " and does not get rid of other element or step in claims.Employed term " one " or " one " do not get rid of a plurality of in claims.The function of several devices that uniprocessor or other unit can be realized in claims being quoted.

Claims

1. a crosshead type large turbosupercharging two stroke IC engine (1) comprising:

A plurality of cylinders, each cylinder are connected to waste gas receiver (6);

Scr reactor (8), its inlet are connected to the outlet of described waste gas receiver (6);

Outlet pipe (10), its outlet with described scr reactor (8) is connected to the turbo machine (12) of turbosupercharger;

The compressor of described turbosupercharger (14) is driven by described turbo machine (12), and described compressor (14) is sent to scavenging receiver (22) with scavenging via the scavenging path (16) that comprises scavenging cooler (18);

Auxiliary blower (20), it is used for auxiliary described compressor (14) under low loading condition in described scavenging path (16);

Described scavenging receiver (22) is connected to each in described a plurality of cylinder;

Controlled by-pass line (26), it extends to a position between the inlet of the outlet that is positioned at described scr reactor (8) the described outlet pipe (10) and described turbo machine (12) from position in auxiliary blower downstream described in the described scavenging path (16) or from described scavenging receiver (22);

ECU (Electrical Control Unit) (33), it may be operably coupled to described by-pass line (26), described ECU (Electrical Control Unit) (33) is configured to when engine loading is lower than predetermined threshold or when the temperature of the waste gas that enters described scr reactor (8) is lower than given threshold value, allows scavenging stream to flow to described outlet pipe (10) from described scavenging receiver (22) by described controlled by-pass line (26).

2. crosshead type large turbosupercharging two stroke IC engine as claimed in claim 1, wherein, described outlet pipe (10) comprises and is used for the three port hybrid point (30) that the scavenging with bypass mixes with waste gas.

3. crosshead type large turbosupercharging two stroke IC engine as claimed in claim 1, wherein, described by-pass line (26) comprises valve (28), it is used to control scavenging flowing by described by-pass line (26).

4. crosshead type large turbosupercharging two stroke IC engine as claimed in claim 3, wherein, described valve (28) is the on-off type electrically-controlled valve of being controlled by described ECU (Electrical Control Unit) (33) in the open loop.

5. crosshead type large turbosupercharging two stroke IC engine as claimed in claim 3, wherein, described valve (28) is the proportional-type electrically-controlled valve of being controlled by described ECU (Electrical Control Unit) (33) in the closed loop.

6. crosshead type large turbosupercharging two stroke IC engine as claimed in claim 6 also comprises the temperature transducer (35) of the inlet that is close in described scr reactor (8).

7. crosshead type large turbosupercharging two stroke IC engine as claimed in claim 1, wherein, described ECU (Electrical Control Unit) (33) the described scavenging cooler (18) of can stopping using.

8. crosshead type large turbosupercharging two stroke IC engine as claimed in claim 7, wherein, described ECU (Electrical Control Unit) (33) is configured to and will opens described by-pass line (26) as first measure, and the described scavenging cooler (18) of will stopping using is as second measure.

9. crosshead type large turbosupercharging two stroke IC engine as claimed in claim 7 wherein, can make described scavenging cooler (18) change heater into by described ECU (Electrical Control Unit) (33).

10. want 8 described crosshead type large turbosupercharging two stroke IC engines as right, wherein, described ECU (Electrical Control Unit) (33) is configured to and will makes described scavenging cooler (18) change heater into as the 3rd measure.

11. a crosshead type large turbosupercharging two stroke IC engine (1) comprising:

ECU (Electrical Control Unit) (33), it is configured at engine loading during less than given threshold value or when the temperature of the waste gas that enters described scr reactor (8) is lower than given threshold value, reduces or the refrigerating function of the described scavenging cooler (18) of stopping using.

12. want 11 described crosshead type large turbosupercharging two stroke IC engines as right, also comprise the scavenging by-pass pipe (17) that is used to walk around described scavenging cooler (18).

13. want 12 described crosshead type large turbosupercharging two stroke IC engines as right, also comprise one or more electrically-controlled valve (23,21) that is subjected to described ECU (Electrical Control Unit) (33) command control, be used to control scavenging flowing by described scavenging by-pass pipe (17).

14. want 11 described crosshead type large turbosupercharging two stroke IC engines as right, also comprise cooling medium supplying pipe (40), cooling medium reflow pipe (42) with automatically controlled seperating vale (46) and the cooling medium bypass circuit (43) that comprises automatically controlled by-pass valve (44).

15. want 14 described crosshead type large turbosupercharging two stroke IC engines as right, also comprise recirculation pipe (48) and recirculating pump (50).

16. want 15 described crosshead type large turbosupercharging two stroke IC engines as right, also be included in the heat exchanger (52) in the described recirculation pipe, be used for the medium that heating flows through described recirculation pipe (48).

17. want 14 described crosshead type large turbosupercharging two stroke IC engines as right, also comprise the second scavenging cooler (19), wherein, described ECU (Electrical Control Unit) (33) is configured to control at least one the cooling capacity in the scavenging cooler (18,19).

18. want 11 described crosshead type large turbosupercharging two stroke IC engines as right, also comprise the steam ascending pipe (90) that is connected to described scavenging path (16), described steam ascending pipe (50) comprises the automatically controlled steam injection control valve (92) of the command control that is subjected to described ECU (Electrical Control Unit) (33).

19. want 11 described crosshead type large turbosupercharging two stroke IC engines as right, also comprise the waste gas ascending pipe (60) that is connected to described scavenging path (16), described waste gas ascending pipe (60) comprises the automatically controlled waste gas injection control valve (92) of the command control that is subjected to described ECU (Electrical Control Unit) (33).

20. want 11 described crosshead type large turbosupercharging two stroke IC engines as right, also be included in the unit heater (27) in the described scavenging path.

21. want 20 described crosshead type large turbosupercharging two stroke IC engines as right, wherein, operate described unit heater (27) as heat medium with hot air.

22. want 14 described crosshead type large turbosupercharging two stroke IC engines as right, also be included in the heat exchanger (80) in the described cooling medium supplying pipe (40), be used for heat is supplied to the medium that flows through described cooling medium supplying pipe (40).