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CN112211759A - A gas engine knock suppression device and its suppression method - Google Patents

A gas engine knock suppression device and its suppression method Download PDF

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Publication number
CN112211759A
CN112211759A CN202011095640.7A CN202011095640A CN112211759A CN 112211759 A CN112211759 A CN 112211759A CN 202011095640 A CN202011095640 A CN 202011095640A CN 112211759 A CN112211759 A CN 112211759A
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China
Prior art keywords
working fluid
gas engine
ejector
control valve
fluid
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CN202011095640.7A
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Chinese (zh)
Inventor
赵建辉
刘伟龙
陈修旻
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Harbin Engineering University
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Harbin Engineering University
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Priority to CN202011095640.7A priority Critical patent/CN112211759A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/16—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system with EGR valves located at or near the connection to the exhaust system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake system
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10255—Arrangements of valves; Multi-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
    • F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids

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

Abstract

本发明的目的在于提供一种气体机爆震抑制装置及其抑制方法，包括气体机、涡轮增压器，气体机的排气管分别连接EGR通道和涡轮增压器的涡轮，EGR通道连接混合器的第一入口，混合器的出口连接气体机的进气管，涡轮的出口分别连接大气和引射流体进气管，引射流体进气管通过引射流体控制阀连接引射器，涡轮增压器的压气机出口分别连接工作流体进气管和混合流体排气管，工作流体进气管通过工作流体控制阀连接引射器，引射器的出口连接混合流体排气管，混合流体排气管连接混合器的第二入口。在不影响气体机功率输出的前提下，本发明可以把涡轮后端的低压废气引射到气体机的进气管内，使气体机获得更高的EGR率，实现气体机在大负荷工况下的爆震抑制。

Figure 202011095640

The purpose of the present invention is to provide a device for suppressing knocking of a gas engine and a method for suppressing the same, comprising a gas engine and a turbocharger. The first inlet of the mixer, the outlet of the mixer is connected to the intake pipe of the gas engine, the outlet of the turbine is respectively connected to the atmosphere and the intake fluid of the injection pipe, and the intake pipe of the injection fluid is connected to the ejector through the injection fluid control valve, and the turbocharger The outlet of the compressor is respectively connected to the working fluid intake pipe and the mixed fluid exhaust pipe, the working fluid intake pipe is connected to the ejector through the working fluid control valve, the outlet of the ejector is connected to the mixed fluid exhaust pipe, and the mixed fluid exhaust pipe is connected to the mixed fluid. the second inlet of the device. On the premise of not affecting the power output of the gas engine, the invention can inject the low-pressure exhaust gas at the rear end of the turbine into the air intake pipe of the gas engine, so that the gas engine can obtain a higher EGR rate and realize the high-load operation of the gas engine. Knock suppression.

Figure 202011095640

Description

Gas engine detonation suppression device and suppression method thereof
Technical Field
The invention relates to an engine, in particular to a gas engine.
Background
With the increase of environmental pollution and the exhaustion of fossil resources, the gas engine can achieve the best economy and emission performance by burning hydrogen or natural gas, and thus is widely used. In order to improve the power and efficiency of natural gas engines, natural gas engines are usually matched with turbocharging systems, but this can lead to the occurrence of gas engine knocking, which can lead to drastic deterioration of gas engine performance and reduced engine life and reliability, so that a greater degree of knocking is strictly not allowed on gas engines. German MAN company detects and controls knocking by means of a cylinder pressure sensor installed on the gas engine along with the main engine.
The knock suppression can be realized by adding hydrogen with a faster combustion speed into natural gas, but the method needs to add a set of hydrogen supply system on the host machine, which not only increases the manufacturing cost of the host machine, but also has the problem of hydrogen safety. Currently, the more common technical means for gas engines is Exhaust Gas Recirculation (EGR), which reduces the knocking of the gas engine to some extent by redirecting a portion of the exhaust gas back into the cylinder, but this technique has certain limitations, especially for heavy load conditions. This is because, in order to achieve a large power demand, the gas engine needs to apply more exhaust gas to the turbocharger system to compress more fresh air, but at this time, the high-temperature and high-pressure gas in the cylinder increases, the tendency of occurrence of knocking increases, the exhaust gas needs to be recirculated by the EGR system to reduce the thermal state in the cylinder, but the exhaust gas cannot be bypassed to the EGR system because of driving the turbine, which makes it impossible to achieve a technical means of achieving knock suppression by EGR under a heavy load condition.
Disclosure of Invention
The invention aims to provide a gas engine knock suppression device and a suppression method thereof, which are used for solving the problem that the prior art cannot effectively suppress engine knock under a large-load working condition.
The purpose of the invention is realized as follows:
the invention relates to a gas engine knock suppression device, which is characterized in that: the exhaust pipe of the gas machine is respectively connected with the turbine of an EGR passage and the turbine of the turbocharger, the EGR passage is connected with a first inlet of a mixer, an outlet of the mixer is connected with an air inlet pipe of the gas machine, an outlet of the turbine is respectively connected with the atmosphere and an injection fluid air inlet pipe, the injection fluid air inlet pipe is connected with an ejector through an injection fluid control valve, a gas compressor outlet of the turbocharger is respectively connected with a working fluid air inlet pipe and a mixed fluid exhaust pipe, the working fluid air inlet pipe is connected with the ejector through the working fluid control valve, an outlet of the ejector is connected with a mixed fluid exhaust pipe, and the mixed fluid exhaust pipe is connected with a second inlet of the mixer.
The knock suppressing apparatus for a gas engine according to the present invention may further include:
1. the ejector comprises an inlet shell, a mixing chamber and a diffusion chamber which are sequentially connected, a working fluid channel is arranged in the inlet shell, a working fluid inlet and a nozzle are respectively arranged at two ends of the working fluid channel, the working fluid inlet is connected with a working fluid control valve, an ejection fluid inlet is arranged on the inlet shell and is connected with the ejection fluid control valve, a mixed fluid outlet is arranged at the end part of the diffusion chamber, and the mixed fluid outlet is connected with a mixed fluid exhaust pipe.
2. The diameter of the working fluid channel decreases toward the nozzle from the working fluid inlet.
The invention discloses a method for suppressing gas engine detonation, which is characterized by comprising the following steps:
under the working condition of small load, the injection fluid control valve and the working fluid control valve are kept closed, part of the waste gas discharged from the cylinder of the gas engine flows through the EGR control valve and the cooler, enters the mixer, is mixed with air and then enters the cylinder again to participate in the combustion process, and the other part of the waste gas flows through the turbine of the turbocharger, works on the turbine and then is discharged from an exhaust pipe at the rear end of the turbine;
under the working condition of large load, the injection fluid control valve and the working fluid control valve are both in an open state, part of pressurized air at the rear end of the air compressor enters the injector from the working fluid inlet, the pressurized air flows out of the nozzle at high speed and then enters the mixing chamber, the diameter of a pipeline is reduced when the pressurized air flows through the nozzle, the cross-sectional area of gas circulation is reduced, the flow rate of the gas is increased, a low-pressure area is formed at the outlet of the nozzle, a pressure difference is formed between the low-pressure area and low-pressure waste gas at the rear end of the turbine, the low-pressure waste gas is sucked into the injector through the injection fluid inlet of the injector, the low-pressure waste gas and the pressurized air flow through the diffusion chamber after mixing and energy exchange are completed in the mixing chamber, the low-pressure waste gas.
The invention has the advantages that: on the premise of not influencing the power output of the gas engine, the gas engine knock suppression device can inject low-pressure waste gas at the rear end of the turbine into the air inlet pipe of the gas engine, so that the gas engine obtains higher EGR rate, and the knock suppression of the gas engine under a large-load working condition is realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the ejector of the present invention.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
referring to fig. 1-2, the engine knock suppression device of the present invention includes an injection fluid control valve 7, a working fluid control valve 8, an injector 9, an injection fluid intake pipe 101, a working fluid intake pipe 102, and a mixed fluid exhaust pipe 103.
As shown in fig. 2, the ejector 9 includes a working fluid inlet 10, a nozzle 11, a mixing chamber 12, an ejector fluid inlet 13, a diffusion chamber 14, and a mixed fluid outlet 15.
An injection fluid inlet 13, a working fluid inlet 10 and a mixed fluid outlet 15 of the ejector 9 are respectively connected with the injection fluid module, the working fluid module and the mixed fluid module.
The injection fluid module comprises an injection fluid air inlet pipe 101 and an injection fluid control valve 7, one end of the injection fluid air inlet pipe 101 is connected with an exhaust pipe at the rear end of the turbine, the other end of the injection fluid air inlet pipe 101 is connected with an injection fluid inlet of the injector 9, and the injection fluid control valve 7 is installed on the injection fluid air inlet pipe 101 and is installed in front of the injection fluid inlet of the injector 9.
The working fluid module comprises a working fluid inlet pipe 102 and a working fluid control valve 8, one end of the working fluid inlet pipe 102 is connected with an air inlet pipe at the rear end of the air compressor, the other end of the working fluid inlet pipe 102 is connected with a working fluid inlet of the ejector 9, and the working fluid control valve 8 is installed on the working fluid inlet pipe 102 and is installed in front of the working fluid inlet of the ejector 9.
The mixed fluid module comprises a mixed fluid exhaust pipe 103, and two ends of the mixed fluid exhaust pipe 103 are respectively connected with a mixed fluid outlet of the ejector 9 and an air inlet pipe in front of the intercooler 6.
Under the working condition of small load, the injection fluid control valve 7 and the working fluid control valve 8 are kept closed, and the injection fluid module and the working fluid module are not communicated with the injector 9. A part of the exhaust gas discharged from the cylinder of the gas engine 1 flows through the EGR control valve 3 and the cooler 4, enters the mixer 5, is mixed with air and then enters the cylinder again to participate in the combustion process, and the other part of the exhaust gas flows through the turbine of the turbocharger 2, works on the turbine and then is discharged from an exhaust pipe at the rear end of the turbine.
Under the working condition of large load, the injection fluid control valve 7 and the working fluid control valve 8 are both in an open state, and the injection fluid module and the working fluid module are communicated with the injector 9. Part of pressurized air at the rear end of the air compressor enters the ejector 9 from the working fluid inlet 10 at a certain pressure, the pressurized air flows out from the nozzle 11 at a high speed and enters the mixing chamber 12, the diameter of a pipeline is reduced when the pressurized air flows through the nozzle 11, the cross-sectional area for gas circulation is reduced, the flow rate of the gas is increased, a low-pressure area appears at the outlet of the nozzle 11, a huge pressure difference is formed between the low-pressure area and low-pressure waste gas at the rear end of the turbine, the low-pressure waste gas is sucked into the ejector 9 through the injection fluid inlet 13 of the ejector 9, the low-pressure waste gas and the pressurized air flow through the diffusion chamber 14 after uniform mixing and energy exchange are completed in the mixing chamber 12, the low-pressure waste gas and the pressurized air are discharged out of the ejector 9 from the.

Claims (4)

1.一种气体机爆震抑制装置，其特征是：包括气体机、涡轮增压器，气体机的排气管分别连接EGR通道和涡轮增压器的涡轮，EGR通道连接混合器的第一入口，混合器的出口连接气体机的进气管，涡轮的出口分别连接大气和引射流体进气管，引射流体进气管通过引射流体控制阀连接引射器，涡轮增压器的压气机出口分别连接工作流体进气管和混合流体排气管，工作流体进气管通过工作流体控制阀连接引射器，引射器的出口连接混合流体排气管，混合流体排气管连接混合器的第二入口。1. a gas engine knocking suppression device is characterized in that: comprise a gas engine, a turbocharger, and the exhaust pipe of the gas engine is respectively connected to the turbine of the EGR passage and the turbocharger, and the EGR passage connects the first of the mixer. The inlet, the outlet of the mixer is connected to the intake pipe of the gas engine, the outlet of the turbine is connected to the air inlet pipe and the injection fluid inlet pipe respectively, the injection fluid inlet pipe is connected to the ejector through the injection fluid control valve, and the compressor outlet of the turbocharger Connect the working fluid intake pipe and the mixed fluid exhaust pipe respectively, the working fluid intake pipe is connected to the ejector through the working fluid control valve, the outlet of the ejector is connected to the mixed fluid exhaust pipe, and the mixed fluid exhaust pipe is connected to the second mixer of the mixer. Entrance. 2.根据权利要求1所述的一种气体机爆震抑制装置，其特征是：所述引射器包括依次相连的入口壳体、混合室、扩散室，入口壳体里设置工作流体通道，工作流体通道的两端分别为工作流体入口和喷嘴，工作流体入口连接工作流体控制阀，入口壳体上设置引射流体入口，引射流体入口连接引射流体控制阀，扩散室的端部为混合流体出口，混合流体出口连接混合流体排气管。2. The device for suppressing knocking of a gas engine according to claim 1, wherein the ejector comprises an inlet housing, a mixing chamber and a diffusion chamber which are connected in sequence, and a working fluid channel is arranged in the inlet housing, The two ends of the working fluid channel are the working fluid inlet and the nozzle respectively. The working fluid inlet is connected to the working fluid control valve. The inlet housing is provided with an ejection fluid inlet, and the ejection fluid inlet is connected to the ejection fluid control valve. The end of the diffusion chamber is The mixed fluid outlet is connected to the mixed fluid exhaust pipe. 3.根据权利要求2所述的一种气体机爆震抑制装置，其特征是：工作流体入口向喷嘴方向，工作流体通道的直径变小。3 . The device for suppressing knocking of a gas engine according to claim 2 , wherein the working fluid inlet is directed toward the nozzle, and the diameter of the working fluid passage becomes smaller. 4 . 4.一种气体机爆震抑制方法，其特征是：4. A gas engine knocking suppression method, characterized in that: 在小负荷工况下，引射流体控制阀和工作流体控制阀均保持关闭，从气体机缸内排出的废气，一部分流经EGR控制阀和冷却器进入混合器内与空气混合后重新进入缸内参与燃烧过程，另一部分流经涡轮增压器的涡轮，对涡轮做功后从涡轮后端的排气管排出；Under light load conditions, both the injection fluid control valve and the working fluid control valve are kept closed, and part of the exhaust gas discharged from the gas engine cylinder flows through the EGR control valve and the cooler into the mixer to be mixed with air and then re-enter the cylinder It participates in the combustion process, and the other part flows through the turbine of the turbocharger, and after doing work on the turbine, it is discharged from the exhaust pipe at the rear end of the turbine; 在大负荷工况下，引射流体控制阀和工作流体控制阀均为打开状态，压气机后端的部分增压空气从工作流体入口进入引射器，增压空气从喷嘴高速流出后进入混合室，增压空气流经喷嘴时管道直径变小，气体流通的横截面积减小，气体的流速增大，喷嘴出口处出现低压区，低压区与涡轮后端的低压废气间形成压差，低压废气通过引射器的引射流体入口被卷吸到引射器内，低压废气和增压空气在混合室内完成混合及能量交换后流经扩散室，从混合流体出口排出引射器，混合流体最终经混合流体排气管进入中冷器前的空气进气管。Under heavy load conditions, both the ejector fluid control valve and the working fluid control valve are open, and part of the boosted air at the rear end of the compressor enters the ejector from the working fluid inlet, and the boosted air flows out of the nozzle at a high speed and then enters the mixing chamber , When the supercharged air flows through the nozzle, the diameter of the pipeline becomes smaller, the cross-sectional area of the gas flow decreases, the flow rate of the gas increases, and a low-pressure area appears at the outlet of the nozzle. Through the ejection fluid inlet of the ejector, it is entrained into the ejector, and the low-pressure exhaust gas and pressurized air flow through the diffusion chamber after completing the mixing and energy exchange in the mixing chamber, and are discharged from the ejector from the outlet of the mixed fluid. The air intake pipe before entering the intercooler through the mixed fluid exhaust pipe.
CN202011095640.7A 2020-10-14 2020-10-14 A gas engine knock suppression device and its suppression method Pending CN112211759A (en)

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CN114183278A (en) * 2021-12-07 2022-03-15 潍柴动力股份有限公司 A kind of EGR ejector pipeline system and EGR control method

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Application publication date: 20210112