CN103216298B - There is the large-sized two-stroke diesel engine of waste gas cleaning system - Google Patents

There is the large-sized two-stroke diesel engine of waste gas cleaning system Download PDF

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Publication number
CN103216298B
CN103216298B CN201310073354.4A CN201310073354A CN103216298B CN 103216298 B CN103216298 B CN 103216298B CN 201310073354 A CN201310073354 A CN 201310073354A CN 103216298 B CN103216298 B CN 103216298B
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China
Prior art keywords
scavenging
internal combustion
waste gas
stroke internal
receptor
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CN201310073354.4A
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CN103216298A (en
Inventor
皮特·斯柯达哥
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MAN Energy Solutions Filial af MAN Energy Solutions SE
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MAN Diesel Filial af MAN Diesel SE
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Classifications

    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/14—Control of the alternation between or the operation of exhaust drive and other drive of a pump, e.g. dependent on speed
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • 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]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0418—Layout of the intake air cooling or coolant circuit the intake air cooler having a bypass or multiple flow paths within the heat exchanger to vary the effective heat transfer surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0437—Liquid cooled heat exchangers
    • F02B29/0443—Layout of the coolant or refrigerant circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/16—Control of the pumps by bypassing charging air
    • F02B37/168—Control of the pumps by bypassing charging air into the exhaust conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
    • F02D41/0245—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by increasing temperature of the exhaust gas leaving the engine
    • 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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/04—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture
    • F02M31/10—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture by hot liquids, e.g. lubricants or cooling water
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1404—Exhaust gas temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Supercharger (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The present invention is to have the large-sized two-stroke diesel engine of waste gas cleaning system, relates to a kind of crosshead type large turbocharging two-stroke internal combustion engine, and including multiple cylinders, each cylinder is connected to waste gas receptor.Scr reactor is placed in the downstream of waste gas receptor.The outlet of this scr reactor is connected to the turbine of turbocharger by exhaustor.The compressor of this turbine drives turbocharger, scavenging is sent to scavenging receptor via scavenging path by this compressor.This scavenging receptor is connected to multiple cylinder.Auxiliary blower in scavenging path assists this compressor under low load conditions.Controllable bypass pipeline extends to exhaustor from scavenging receptor.Under low engine loading, controlled scavenging stream is guided from scavenging receptor the position of the upstream to one turbine being positioned at scr reactor downstream and turbocharger of exhaustor.This measure makes the temperature of the waste gas of entrance scr reactor increase.

Description

There is the large-sized two-stroke diesel engine of waste gas cleaning system
Technical field
The present invention relates to the large-sized turbo-charging two-stroke internal combustion piston engine of a kind of crosshead Machine, is preferably directed to a kind of Diesel engine with waste gas cleaning system, particularly relates to a kind of tool The crosshead type large two-stroke diesel engine of selective catalytic reduction reactor.
Background technology
The large-sized two-stroke electromotor of crosshead be generally used for large vessel propulsion system or As the prime mover in power plant.Emissions requirements and it will be more difficult to meet, and especially closes In single nitrogen oxides (NOx) level.
Using SCR (SCR) reactor is known to start for auxiliary diesel Machine reduces NOxThe measure of discharge.Require that the minimum temperature entering the waste gas of SCR converter is big About 300 to 350 DEG C, so that SCR reactor is properly functioning.
But, due to the characteristic of two-stroke turbocharged engine, low engine loading is (such as Less than the continous maximum rating relevant to electromotor 40%) under EGT relatively low, That is, it is too low to be converted in SCR reactor for waste gas.
Under the conditions of above-mentioned low-load, it is difficult in large-sized turbo-charging two-stroke diesel engine Keep enough scavenging pressures.Therefore, under the conditions of such low-load, auxiliary blower is used Keep scavenging pressure.Thus, adopted to increase EGT at SCR reactor air inlet Scavenging pressure should not adversely affected by any method taken.
Accordingly, it would be desirable to a kind of turbocharging two overcoming drawbacks described above or at least reducing drawbacks described above Stroke diesel engine.
Summary of the invention
In this context, it is an object of the present invention to provide one can start on a large scale The large-sized turbo-charging two-stroke diesel operated together with SCR reactor under machine loading condition starts Machine.
By providing a kind of crosshead type large turbocharging two-stroke internal combustion engine to realize above-mentioned mesh , this internal combustion engine includes: multiple cylinders, and each cylinder is connected to waste gas receptor；Selectivity Catalytic reduction reactor, its entrance is connected to the outlet of waste gas receptor；Exhaustor, it will choosing The outlet of selecting property catalytic reduction reactor is connected to the turbine of turbocharger；Turbocharger Compressor by this turbine drives, this compressor by scavenging via including sweeping of scavenging cooler Gas circuit footpath is sent to scavenging receptor；Auxiliary blower, it is in this scavenging path, is used for This compressor is assisted under the conditions of low-load；It is each that this scavenging receptor is connected in multiple cylinder Cylinder；Controllable bypass pipeline, it is one position in this auxiliary blower downstream from scavenging path Place or to extend to be positioned at this SCR in this exhaustor at this scavenging receptor anti- Answer a position between outlet and the entrance of this turbine of device；ECU, it is operable Be connected to this by-pass line, this ECU is configured at engine loading less than predetermined threshold value Time or when entering the temperature of waste gas of this scr reactor less than given threshold value, Scavenging stream is allowed to flow to exhaustor from scavenging receptor by controllable bypass pipeline.
Under a low load, controlled scavenging stream is guided to being positioned at selective catalysis from scavenging receptor The aerofluxus of the position of the upstream of the turbine in the downstream of reduction reactor and turbocharger Pipe.This measure makes the temperature of the waste gas of entrance scr reactor increase, and does not bears Affect scavenging pressure to face.
This exhaustor can include the 3 port hybrid points for the scavenging of bypass being mixed with waste gas.
This by-pass line can include valve, and it is for controlling the scavenging flowing by this by-pass line.
This valve can be the on-off type electrically-controlled valve controlled by ECU 33 in open loop.
Alternatively, this valve can be that the proportional-type controlled by ECU in closed loop is automatically controlled Valve.
Electromotor may also include the temperature sensing of the entrance being close in scr reactor Device.
This electromotor configurable so that scavenging cooler can be disabled by this ECU.
This ECU is configurable to, using opening this by-pass line as the first measure, will disable This scavenging cooler is as the second measure.
This electromotor can be configured so that can be turned by this scavenging cooler by this ECU Become heater.
This electromotor can be configured so that this ECU is configured to this scavenging cooler to be made to turn Become heater as the 3rd measure.
The purpose of the present invention can also be by providing a kind of crosshead type large turbocharging two-stroke Internal combustion engine realizes, and this internal combustion engine includes: multiple cylinders, and each cylinder is connected to waste gas and receives Device；Scr reactor, its entrance is connected to the outlet of waste gas receptor；Aerofluxus Pipe, its turbine that outlet of scr reactor is connected in turbocharger； The compressor of this turbocharger is by this turbine drives, and scavenging is swept via including by this compressor The scavenging path of Gas Cooler is sent to scavenging receptor；Auxiliary blower, it is on this scavenging road In footpath, for assisting this compressor under low load conditions；This scavenging receptor is connected to multiple Each cylinder in cylinder；ECU, is configured to when engine loading is less than given threshold value Or when entering the temperature of waste gas of this scr reactor less than given threshold value, fall Low or disable the refrigerating function of this scavenging cooler.
This electromotor could be included for walking around the scavenging shunt valve of scavenging cooler.
This electromotor can also include by the instruction of ECU control one or more automatically controlled Valve, for controlling the scavenging flowing by this scavenging shunt valve.
This electromotor can also include having the cooling medium supply pipe of automatically controlled seperating vale, cooling is situated between Matter return duct and the cooling medium bypass conduit including automatically controlled bypass valve.This electromotor can also wrap Include recirculation pipe and recirculation pump.The heat friendship that this electromotor is additionally may included in this recirculation pipe Parallel operation, for adding the heat flow medium by this recirculation pipe.
This electromotor can also include the second scavenging cooler, and wherein this ECU is configured to control The cooling capacity of at least one in scavenging cooler processed.
This electromotor can also include the steam ascending pipe being connected to scavenging path, and this steam injects Pipe includes the electrical control steam injection control valve controlled by the instruction of ECU.
This electromotor can also include the waste gas ascending pipe being connected to scavenging path, and this waste gas injects Pipe includes the automatically controlled waste gas injection control valve controlled by the instruction of ECU.
This electromotor is additionally may included in the unit heater in scavenging path.Can be with hot-air As heating this unit heater of media operation.
This electromotor is additionally may included in the heat exchanger in cooling medium supply pipe, for by heat Amount is supplied to the medium flowed by this cooling medium supply pipe.
The further purpose of the large-sized two-stroke explosive motor according to the present invention, feature, excellent Point and character will become obvious by specific descriptions.
Accompanying drawing explanation
In the part in detail below of this specification, with reference to the accompanying drawings shown in exemplary enforcement Example is explained in greater detail the present invention, wherein:
Fig. 1 is the graphical diagram of electromotor according to a first embodiment of the present invention；
Fig. 2 shows the graphical diagram of second embodiment of the invention；
Fig. 3 to Fig. 7 shows the more embodiments reducing cooling that make use of scavenging；And
Fig. 8 to Figure 12 shows the more embodiments that make use of the active of scavenging to heat.
Detailed description of the invention
In the following detailed description, by exemplary embodiment, ten according to the present invention will be described Prefix type large-sized turbo-charging two-stroke diesel engine and be used for operating crosshead type large turbine The method of supercharging two-stroke diesel engine.
Crosshead type large turbocharging two-stroke diesel engine is structurally and operationally many institute's weeks Know, therefore need not be explained further in this article.Provide below about waste gas cleaning system The detailed description of operation.
Fig. 1 shows the first exemplary of the large-sized two-stroke diesel engine 1 according to the present invention Embodiment.Electromotor 1 can be used for example as the sustainer in foreign-going ship or be used as to run The stationary engine of electromotor in electric station.Total output of electromotor can such as 5000 to In the range of 110000kW.
Electromotor 1 is provided with multiple cylinder, and the plurality of cylinder is side by side in line. Each cylinder is provided with the air bleeding valve being associated with its cylinder cover.Can be opened by this air bleeding valve With closedown exhaust pathway.Piston rod is connected to the major part of bent axle by the crosshead of electromotor.Aerofluxus Bend pipe is connected to waste gas receptor 6.Waste gas receptor 6 is set to parallel with a line cylinder.Useless Gas receptor 6 is bulk container, and its size is particularly suitable for engine characteristics, for optimal air-flow, Back-pressure and the consideration of acoustics.Generally, the big hollow that waste gas receptor 6 is made up of steel plate Cylinder.Owing to its size and volume are relatively big, for the purpose in terms of vibration processing, make waste gas Receptor is suspended on engine structure.
By waste gas stream from the outlet of waste gas receptor 6 via selective catalytic reactor 8 (SCR Reactor) and exhaustor 10 guide to the turbine 12 of turbocharger.Therefore, waste gas connects The outlet receiving device 6 is connected to the entrance of SCR reactor 8.Waste gas flows through SCR reactor 8, Remove the NOx in waste gas or the NOx amount at least substantially reducing in waste gas, by NOx It is converted into nitrogen and oxygen.The outlet of SCR reactor is connected to exhaustor 10, and this exhaustor 10 will The waste gas of heat and pressurization causes turbine 12.Waste gas is discharged into the air downstream of turbine 12.
Turbocharger also includes the compressor 14 driven by turbine 12.Compressor 14 connects To air intake.The scavenging of pressurization is sent to sweep by compressor 14 via scavenging flow path 16 Gas receptor 22, this scavenging flow path 16 includes scavenging cooler 18 and auxiliary blower 20.
Scavenging cooler 18 is run as cooling medium using water.Scavenging cooler 18 can be each Type.One is probably panel cooler, and wherein cooling medium does not directly connect with scavenging physics Touch.Alternatively possible is scrubber (scrubber), and wherein cooling medium directly contacts with scavenging.
Auxiliary blower 20 generally by electrical motor driven (can also be by fluid motor-driven) and And start working under low-load condition (usually less than the 40% of continous maximum rating), so that Compressor 14 keeps enough scavenging pressures.When not using auxiliary blower, it is not by showing The bypass gone out is walked around.
Scavenging receptor 22 is the elongated hollow cylindrical body of the cylinder extension along electromotor.Scavenging stream The scavenging port of each cylinder is arrived from scavenging receptor 22.
Controllable bypass pipeline 26 starts branch from scavenging receptor 22.Controllable bypass pipeline 26 The other end is connected with exhaustor 10 at 3 port hybrid points 30.Mixing point 30 is positioned at SCR The downstream of reactor 8 outlet and the upstream of turbine 12 entrance.
Alternatively, auxiliary drum during the starting point of controllable bypass pipeline 26 may be located at scavenging air pipe 16 The position in blower fan 20 downstream.
Under the instruction of ECU 33, electrically-controlled valve 28 regulates from scavenging flow path 16 to row The flowing of the scavenging of trachea 10.In one embodiment, valve 28 is by automatically controlled in open loop The on/off-type valve that unit 33 controls.In this embodiment, ECU 33 is configured to starting Machine load is opened valve 28 and is increased at engine loading pre-when dropping to below predetermined threshold Determine to close valve closing 28 during more than threshold value.The two threshold value need not be identical and can be defined as accounting for starting The percentage ratio of the continous maximum rating of machine.
In another embodiment, electrically-controlled valve 28 is to be controlled by ECU 33 in closed loop Proportioning valve.Here, controller receives about SCR reactor 8 entrance from temperature sensor 35 The information of EGT at place, and ECU 33 is configured to respond the entrance SCR recorded The EGT of reactor 8 carrys out the opening degree of control valve 28.Therefore, low when the temperature recorded When minimum expectation temperature, ECU 33 will increase the opening degree of electrically-controlled valve 28 to increase EGT.
This threshold value can also be controlled by the mixing temperature of turbine inlet, i.e. at temperature ratio During temperature height needed for SCR reactor 8, by-pass line 26 is closed, more anti-than SCR in temperature When temperature needed for answering device 8 is the most much lower, by-pass line 26 is opened.
After mixing temperature at default turbine inlet, to control phase with described load As mode control ON/OFF bypass.
Fig. 2 shows the second exemplary of the large-sized two-stroke diesel engine 1 according to the present invention Embodiment.The reference identical with Fig. 1 refers to identical parts.Except scavenging path 16 In scavenging cooler 18 following aspect outside, according to the enforcement of the embodiment of Fig. 2 with Fig. 1 Example major part is the most identical.
Cold water is sent to scavenging cooler 18 and return duct 42 by warm water from sweeping by supply pipe 40 Gas Cooler 18 is transported away.In a second embodiment, the electricity in cooling medium bypass conduit 43 Control bypass valve 44 and the automatically controlled seperating vale 46 under acting on the instruction of controller 33 make supply pipe Cold water in 40 can obstructed overscan Gas Cooler 18 and deviate be fed in return duct 42.Bag The recirculation pipe 48 including pump 50 and heater (or heat exchanger) 52 guarantees that water flows by sweeping Gas Cooler 18, now scavenging cooler 18 becomes heater and effectively serves as heat exchange Device.Heater 52 be provided with temperature add thermal medium, such as constitute the warm water of engine-cooling system, And the medium cycling through scavenging cooler 18 is heated.
In a second embodiment, ECU 33 can be by making cooling be situated between via valve 44 and 46 Matter bypass is walked around and is made cooler 18 not work.Meanwhile, controller 33 will activate pump 50 with really Protect medium to circulate in scavenging cooler 18.Additionally, control unit 33 can be by heating Medium is sent to heater 52 to activate heater 52, thus becomes adding by scavenging cooler 18 Hot device.ECU 33 is configured to according to the EGT increasing entrance SCR reactor 8 Demand and adopt various measures to increase scavenging temperature.
Therefore, if making some scavengings enter exhaustor 10 just foot by controllable bypass pipeline 26 Enough, ECU 33 will not take any further measure.But, if this first measure is not Enough, then ECU 33 will disable the refrigerating function of scavenging cooler 18.If this is second years old Measure is inadequate, and as the 3rd measure, ECU 33 will be changed into scavenging cooler 18 and add Hot device is actively to heat scavenging.
Fig. 2 shows the scavenging of multiple positions in system and the example of the temperature of waste gas.These Example is used for low engine load conditions, such as less than relevant to flourishing machine continous maximum rating 40%.The most parenthesized numeral be by by-pass line 26 and at scavenging cooler 18 quilt The temperature of the scavenging of heating.Numeral in bracket is not make scavenging operating electromotor routinely Temperature by by-pass line 26 and when making scavenging cooler 18 cool down scavenging.Use New Measure Time, enter SCR reactor 8 EGT be 325 DEG C, waste gas the hottest and can be at SCR Reactor 8 is converted.When not using New Measure, enter the EGT of SCR reactor 8 Being 220 DEG C, waste gas is the warmmest and can not be converted in SCR reactor 8.
Fig. 3 shows that cooling medium supplies to scavenging cooler via cooling medium supply pipe 40 18 and be back to scavenging cooler 18 via cooling medium return duct 42.
Fig. 4 to Fig. 7 shows the multiple reality of the controlled minimizing of the cooling capacity of scavenging cooler 18 Execute example.
In the diagram, electromotor is provided with the scavenging shunt valve for walking around scavenging cooler 18 17.Scavenging shunt valve 17 includes opening and closing scavenging under the instruction at ECU 33 The electrically-controlled valve 23 of shunt valve 17.Scavenging path 16 includes for the instruction at ECU 33 Another electrically-controlled valve 21 in lower opening and closing scavenging path 16.Therefore, ECU 33 is permissible The stream of the scavenging by described scavenging shunt valve 17 is controlled according to the needs increasing scavenging temperature Dynamic, thus increase the EGT entering SCR reactor 8.
In Figure 5, cooling medium supply pipe 40 is provided with automatically controlled seperating vale 46 and cooling medium Bypass conduit 43, this cooling medium bypass conduit 43 includes automatically controlled bypass valve 44 and will cool down Medium supply pipe 40 is connected directly to cooling medium return duct 42.ECU 33 is to electronic valve 44 and 46 send instruction, such that it is able to control the cooling medium degree by scavenging cooler 18 (can be on/off or ratio controls).
In figure 6, including the recirculation pipe of recirculation pump (by the control of ECU 33) 48 are added in the embodiment shown in Fig. 5, are used for enabling cooling medium at scavenging cooler 18 Middle circulation.
In the figure 7, electromotor is provided with additional (second) scavenging cooler 19.ECU 33 are configured to control the cooling energy of at least one in scavenging cooler 18,19 as above Power.
Fig. 8 to Figure 12 shows the various embodiments controllably adding in scavenging by heat.
In fig. 8, electromotor is provided with the steam ascending pipe 90 being connected to scavenging path 16. Steam ascending pipe 90 includes being instructed, by ECU 33, the electrical control steam injection control valve 92 controlled. Therefore, by controllably injecting steam, can undesirably increase scavenging temperature, thus increase Enter the temperature of the waste gas of SCR reactor 8 and do not reduce scavenging pressure.
In fig .9, electromotor is provided with the waste gas ascending pipe 60 being connected to scavenging path 16. Described waste gas ascending pipe 60 includes that the automatically controlled waste gas controlled by ECU 33 instruction injects and controls Valve 62.Therefore, by controllably injecting waste gas, can undesirably increase scavenging temperature, from And increase the temperature of the waste gas entering SCR reactor 8 and do not reduce scavenging pressure.
In Fig. 10, electromotor is provided with unit heater 27 in scavenging path 16.To add Thermal medium (such as hot water or hot-air) is supplied to heater list via adding thermal medium supply pipe 70 Unit 27, and by heating medium back flow pipe 72, the heating medium transmission of backflow is walked.Heating Medium supply pipe 70 and heating medium back flow pipe 72 are provided with and are controlled by ECU 33 instruction Electrically-controlled valve.Therefore, it can undesirably increase the temperature of scavenging temperature, thus increase entrance SCR The temperature of the waste gas of reactor 8 and do not reduce scavenging pressure.
The embodiment of Figure 11 is essentially identical with the embodiment of Fig. 6, but also includes for being added by heat Enter to cycle through the heat exchanger of the medium of scavenging cooler 18.
In the fig. 12 embodiment, electromotor is provided with heat friendship in cooling medium supply pipe 40 Parallel operation 80, for being supplied to the medium flowing through cooling medium supply pipe 40 by heat.
Although the purpose in order to illustrate specifically describes teachings of the present application, however, it is understood that These details are only used for the purpose illustrated, and those skilled in the art can be without departing from the application's In the range of teaching, it is made a variety of changes.
Above-described embodiment can combine to improve the function of electromotor in any possible manner.
Should also be noted that: there is multiple alternative to implement the equipment of the teachings of the present invention.
Term used in the present invention " includes " being not excluded for other element or step.The present invention The term "a" or "an" used is not excluded for multiple.Uniprocessor or other unit can To realize the function of several devices of the present invention.

Claims (20)

1. crosshead type large turbocharging two-stroke internal combustion engine (1), including:
Multiple cylinders, each cylinder is connected to waste gas receptor (6)；
Scr reactor (8), its entrance is connected to described waste gas receptor (6) Outlet；
Exhaustor (10), the outlet of described scr reactor (8) is connected by it Turbine (12) to turbocharger；
The compressor (14) of described turbocharger is driven by described turbine (12), described Compressor (14) by scavenging via the scavenging flow path (16) including scavenging cooler (18) It is sent to scavenging receptor (22)；
Auxiliary blower (20), it is in described scavenging flow path (16), for low Described compressor (14) is assisted under loading condition；
Described scavenging receptor (22) is connected to each in the plurality of cylinder；
ECU (33), it is configured to when engine loading is less than given threshold value or is entering When the temperature of the waste gas entering described scr reactor (8) is less than given threshold value, Reduce or disable the refrigerating function of described scavenging cooler (18).
2. crosshead type large turbocharging two-stroke internal combustion engine as claimed in claim 1, Also include the scavenging shunt valve (17) for walking around described scavenging cooler (18).
3. crosshead type large turbocharging two-stroke internal combustion engine as claimed in claim 2, Also include by described ECU (33) instruction control one or more electrically-controlled valve (23, 21) flowing controlling scavenging by described scavenging shunt valve (17), it is used for.
4. crosshead type large turbocharging two-stroke internal combustion engine as claimed in claim 1, Also include having cooling medium supply pipe (40) of automatically controlled seperating vale (46), cooling medium returns Flow tube (42) and include the cooling medium bypass conduit (43) of automatically controlled bypass valve (44).
5. crosshead type large turbocharging two-stroke internal combustion engine as claimed in claim 4, Also include recirculation pipe (48) and recirculation pump (50).
6. crosshead type large turbocharging two-stroke internal combustion engine as claimed in claim 5, The heat exchanger (52) being additionally included in described recirculation pipe, is used for adding heat flow by described The medium of recirculation pipe (48).
7. crosshead type large turbocharging two-stroke internal combustion engine as claimed in claim 4, Also including the second scavenging cooler (19), wherein, described ECU (33) is configured to control The cooling capacity of at least one in scavenging cooler processed (18,19).
8. crosshead type large turbocharging two-stroke internal combustion engine as claimed in claim 1, Also include the steam ascending pipe (90) being connected to described scavenging flow path (16), described steaming Vapour ascending pipe (90) includes being instructed the electrical control steam note controlled by described ECU (33) Enter control valve (92).
9. crosshead type large turbocharging two-stroke internal combustion engine as claimed in claim 1, Also include the waste gas ascending pipe (60) being connected to described scavenging flow path (16), described useless Gas ascending pipe (60) includes being instructed the automatically controlled waste gas note controlled by described ECU (33) Enter control valve (62).
10. crosshead type large turbocharging two-stroke internal combustion engine as claimed in claim 1, The unit heater (27) being additionally included in described scavenging path.
11. crosshead type large turbocharging two-stroke internal combustion engines as claimed in claim 2, Wherein, using hot-air as unit heater (27) described in heating media operation.
12. crosshead type large turbocharging two-stroke internal combustion engines as claimed in claim 4, It is additionally included in the heat exchanger (80) in described cooling medium supply pipe (40), for by heat Amount is supplied to the medium flowed by described cooling medium supply pipe (40).
13. 1 kinds of crosshead type larges turbocharging two-stroke internal combustion engine (1), including:
Multiple cylinders, each cylinder is connected to waste gas receptor (6)；
Scr reactor (8), its entrance is connected to described waste gas receptor (6) Outlet；
Exhaustor (10), the outlet of described scr reactor (8) is connected by it Turbine (12) to turbocharger；
The compressor (14) of described turbocharger is driven by described turbine (12), described Compressor (14) by scavenging via the scavenging flow path (16) including scavenging cooler (18) It is sent to scavenging receptor (22)；
Auxiliary blower (20), it is in described scavenging flow path (16), for low Described compressor (14) is assisted under loading condition；
Described scavenging receptor (22) is connected to each in the plurality of cylinder；
Controllable bypass pipeline (26), it assists air blast from described scavenging flow path (16) One position in machine (20) downstream or extend to described row from described scavenging receptor (22) Trachea (10) is positioned at the outlet of described scr reactor (8) and described whirlpool A position between the entrance of turbine (12)；
It is arranged on the electronic control valve (28) in described controllable bypass pipeline (26), described electricity Sub-control valve (28) regulates from scavenging flow path (16) under the instruction of ECU (33) To the flowing of the scavenging of exhaustor (10), wherein said ECU (33) is configured to sending out Motivation load is less than during predetermined threshold or in the described scr reactor of entrance (8) The temperature of waste gas less than given threshold value time, it is allowed to scavenging stream is from described scavenging receptor (22) Described exhaustor (10) is flowed to by described controllable bypass pipeline (26).
14. crosshead type large turbocharging two-stroke internal combustion engines as claimed in claim 13, Wherein, described exhaustor (10) includes three ports for the scavenging of bypass being mixed with waste gas Mixing point (30).
15. crosshead type large turbocharging two-stroke internal combustion engines as claimed in claim 13, Wherein, described electronic control valve (28) is to be controlled by described ECU (33) in open loop The on-off type electrically-controlled valve of system.
16. crosshead type large turbocharging two-stroke internal combustion engines as claimed in claim 15, Wherein, described ECU (33) is configured to when engine loading drops to predetermined threshold beat Open electronic control valve (28), and close electronics when engine loading rises to predetermined threshold Control valve (28).
17. crosshead type large turbocharging two-stroke internal combustion engines as claimed in claim 13, Wherein, described electronic control valve (28) is to be controlled by described ECU (33) in closed loop The proportional-type electronic control valve of system.
18. crosshead type large turbocharging two-stroke internal combustion engines as claimed in claim 17, Also include the temperature sensor being close in the entrance of described scr reactor (8) (35)。
19. crosshead type large turbocharging two-stroke internal combustion engines as claimed in claim 13, Wherein, described ECU (33) can disable described scavenging cooler (18).
20. crosshead type large turbocharging two-stroke internal combustion engines as claimed in claim 17, Wherein, described ECU (33) is configured to open in described controllable bypass pipeline (26) Electronic control valve (28) as the first measure, and described scavenging cooler (18) will be disabled As the second measure.
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