WO2023142832A1 - 一种天然气发动机高低压egr废气管理系统 - Google Patents

一种天然气发动机高低压egr废气管理系统 Download PDF

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WO2023142832A1
WO2023142832A1 PCT/CN2022/142064 CN2022142064W WO2023142832A1 WO 2023142832 A1 WO2023142832 A1 WO 2023142832A1 CN 2022142064 W CN2022142064 W CN 2022142064W WO 2023142832 A1 WO2023142832 A1 WO 2023142832A1
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egr
exhaust gas
cooler
engine
throttle valve
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PCT/CN2022/142064
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English (en)
French (fr)
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张松
宁德忠
官维
李琼华
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广西玉柴机器股份有限公司
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Publication of WO2023142832A1 publication Critical patent/WO2023142832A1/zh

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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
    • F02M26/02—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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/24—Layout, e.g. schematics with two or more coolers
    • 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
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to the field of engines, in particular to a high-low pressure EGR exhaust gas management system for natural gas engines.
  • Exhaust gas recirculation (EGR) technology is one of the effective measures to reduce the combustion temperature in the cylinder and improve the economical efficiency of the engine.
  • the cooled EGR exhaust gas is mixed with fresh mixed gas and enters the cylinder for combustion, which can reduce the combustion temperature and widen the explosion range to a certain extent. Shock limit, improve economy.
  • EGR technology is mainly divided into two forms: internal EGR and external EGR: internal EGR means that the EGR exhaust gas is directly mixed with the fresh mixed gas in the cylinder, but there are problems that the EGR exhaust gas cannot be cooled and the introduction of the EGR exhaust gas cannot be accurately grasped.
  • EGR exhaust gas is mixed with fresh intake air outside the cylinder, which is divided into three types: high-pressure EGR, low-pressure EGR and high-low pressure EGR; high-pressure EGR means that the EGR exhaust gas is drawn out from the front of the turbine. After being cooled by the EGR cooler, it is mixed with fresh intake air after supercharging.
  • the low-pressure EGR is Refers to the exhaust gas being introduced from behind the turbine, passing through the EGR cooler, to the inlet of the compressor, mixed with the fresh intake air, and then cooled by the intercooler before entering the cylinder for combustion. Since the low-pressure EGR is cooled by the intercooler, and the bleed air pipeline The longer stroke can effectively reduce the combustion temperature and improve the mixing uniformity of the mixture.
  • the EGR throttle valve opening can not be satisfied even when the EGR throttle valve is opened to the maximum.
  • EGR exhaust gas is introduced from the front of the turbine and cooled by EGR. to the inlet of the compressor and mixed with fresh intake air. After secondary cooling, the uniformity of the mixed gas is better and the knock boundary is also widened; the natural gas engine adopts a high and low pressure EGR scheme. After being cooled by the EGR cooler, the EGR The temperature of the exhaust gas is generally 100°C-140°C, and it contains a lot of water.
  • the supercharger compressor compresses the low-temperature and low-pressure fresh charge to convert the low-temperature and low-pressure fresh charge into a high-temperature and high-pressure gas to achieve boosting.
  • a large amount of high-temperature and high-pressure water enters the supercharger compressor and occupies a large volume of fresh charge, on the one hand, it will hinder the introduction of fresh charge, and on the other hand, it will hinder the compressor from absorbing the fresh charge.
  • the work of compression affects the supercharging efficiency of the compressor, thereby affecting the power of the engine and other aspects; secondly, because the EGR exhaust gas contains a large amount of water, it will also corrode the compressor, thereby reducing the reliability and life of the supercharger. , increasing the risk of gas engine instability.
  • the present invention provides a natural gas engine high and low pressure EGR exhaust gas management system to solve the problem that a large amount of high temperature and high pressure EGR exhaust gas containing water enters the compressor, which leads to a decrease in the supercharging efficiency at the compressor end of the supercharger and plays a role in the impeller of the compressor. Corrosion, which seriously affects the performance and reliability of the engine.
  • a high and low pressure EGR exhaust gas management system for a natural gas engine is characterized in that it includes: an engine, an exhaust manifold, a turbocharger, an EGR cooler, an EGR throttle valve, a cooler, a water eliminator, an intercooler, a throttle Valve;
  • the exhaust manifold is connected with the engine; the turbocharger is connected with the exhaust manifold;
  • the EGR cooler is connected to the exhaust manifold; the EGR throttle valve is connected to the EGR cooler; the cooler is connected to the EGR throttle valve; the dehydrator is connected to the cooling connection to the turbocharger;
  • the intercooler is connected with the turbocharger; the throttle valve is connected with the intercooler and the engine.
  • the EGR cooler receives and cools EGR exhaust gas discharged from the exhaust manifold.
  • the EGR throttle valve controls the amount of EGR exhaust gas entering the cooler.
  • the cooler performs secondary cooling on the EGR exhaust gas.
  • the water eliminator is used to remove moisture in EGR exhaust gas.
  • part of the EGR exhaust gas discharged from the engine passes through the EGR cooler, the EGR throttle valve, the cooler and the water eliminator for cooling and water removal, and then enters the turbocharger to mix with air and then passes through the intercooler and throttle into the engine.
  • the throttle valve controls the amount of mixed gas entering the engine.
  • the present invention adds a cooler and a water eliminator after the EGR throttle valve.
  • the temperature is 100°C-140°C.
  • the temperature can be controlled at 30°C-50°C.
  • the cooled EGR exhaust gas will contain more moisture, and a large amount of moisture in the exhaust gas can be removed by installing a water eliminator after the cooler, and the water eliminator can automatically discharge water, which can meet continuous use
  • the EGR exhaust gas entering the compressor inlet is transformed into a low-temperature, low-pressure gas containing a small amount of moisture after cooling down and removing water, thereby reducing the hindrance to the fresh charge entering the compressor and reducing the high-temperature and high-pressure EGR exhaust gas at the compressor inlet.
  • the volume ratio in the compressor improves the boosting efficiency of the compressor and reduces the corrosion of the compressor impeller. Since the moisture in the EGR exhaust gas is removed, the EGR rate can be effectively increased and a wider blast zone can be obtained. Shock limit, effective EGR exhaust gas management, to ensure engine performance.
  • Fig. 1 is the schematic diagram of the EGR waste gas management system of the present invention
  • FIG. 2 is a schematic diagram of an existing EGR exhaust gas management system.
  • the high and low pressure EGR exhaust gas management system for a natural gas engine is characterized in that it includes: an engine 1, an exhaust manifold 2, a turbocharger 3, an EGR cooler 4, an EGR section Flow valve 5, cooler 6, water eliminator 7, intercooler 8, throttle valve 9;
  • the exhaust manifold 2 is connected with the engine 1; the turbocharger 3 is connected with the exhaust manifold 2;
  • the EGR cooler 4 is connected to the exhaust manifold 2; the EGR throttle valve 5 is connected to the EGR cooler 4; the cooler 6 is connected to the EGR throttle valve 5; Water heater 7 is connected with described cooler 6 and turbocharger 3;
  • the intercooler 8 is connected to the turbocharger 3 ; the throttle valve 9 is connected to the intercooler 8 and the engine 1 .
  • the EGR cooler 4 receives and cools the EGR exhaust gas discharged from the exhaust manifold 2 .
  • the EGR throttle valve 5 controls the amount of EGR exhaust gas entering the cooler 6 .
  • the cooler 6 performs secondary cooling on the EGR exhaust gas, reducing the EGR exhaust gas to 30°C-50°C.
  • the water eliminator 7 is used to remove the moisture in the EGR exhaust gas, and the water eliminator 7 can automatically release water, which can meet the requirement of continuous use.
  • part of the EGR exhaust gas discharged from the engine 1 passes through the EGR cooler 4, the EGR throttle valve 5, the cooler 6 and the water eliminator 7 for cooling and water removal, and then enters the turbocharger 3 to mix with air and then Entering the engine through the intercooler 8 and the throttle valve 9, after cooling and removing water, the EGR exhaust gas entering the compressor inlet is transformed into a low-temperature, low-pressure gas containing a small amount of moisture, thereby reducing the impact on the fresh charge entering the compressor.
  • the obstruction of the compressor reduces the volume ratio of the high-temperature and high-pressure EGR exhaust gas in the compressor, improves the boosting efficiency of the compressor, and reduces the corrosion of the compressor impeller. Since the moisture in the EGR exhaust gas is removed, it can be Effectively increase the EGR rate, obtain a wider knock limit, realize effective EGR exhaust gas management, and ensure engine performance.
  • the throttle valve controls the amount of mixed gas entering the engine.

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

Abstract

本发明公开了一种天然气发动机高低压EGR废气管理系统，其特征在于：包括：发动机、排气歧管、涡轮增压器、EGR冷却器、EGR节流阀、冷却器、除水器、中冷器、节气门；所述排气歧管与发动机连接；所述涡轮增压器与所述排气歧管连接；所述EGR冷却器与所述排气歧管连接；所述EGR节流阀与所述EGR冷却器连接；所述冷却器与所述EGR节流阀连接；所述除水器与所述冷却器和涡轮增压器连接；所述中冷器与所述涡轮增压器连接；所述节气门与所述中冷器和发动机连接；本发明解决了目前EGR废气管理系统的大量含有水分的高温高压EGR废气进入到压气机，导致增压器压气机端的增压效率下降，对压气机叶轮起到腐蚀作用，严重影响发动机的性能及可靠性的问题。

Description

一种天然气发动机高低压EGR废气管理系统 技术领域
本发明涉及发动机领域，特别是涉及一种天然气发动机高低压EGR废气管理系统。
背景技术
废气再循环(EGR)技术是降低气缸内燃烧温度、提高发动机经济性的有效措施之一，通过冷却的EGR废气和新鲜混合气混合，进入气缸内燃烧，能够降低燃烧温度，可以一定程度拓宽爆震界限,提升经济性。EGR技术主要分为内部EGR和外部EGR两种形式：内部EGR是指EGR废气直接在气缸内与新鲜混合气进行内部混合，但是存在EGR废气无法进行冷却、EGR废气的引入情况也无法准确掌握的问题，所以无法达到很好的控制效果；外部EGR是指废气在气缸外与新鲜进气混合，分为高压EGR、低压EGR以及高低压EGR三种；高压EGR是指EGR废气从涡轮前引出，经过EGR冷却器冷却，与增压后的新鲜进气混合，由于高压EGR从较高温度的涡轮前取气，且引气管路行程较短，无法达到很好的降低燃烧温度效果；低压EGR是指废气从涡轮后引入，经过EGR冷却器，到压气机入口，与新鲜进气量混合，再经过中冷器冷却后，进入缸内燃烧，由于低压EGR经过中冷器冷却，且引气管路行程较长，可以很好的起到降低燃烧温度效果，同时提高了混合气的混合均匀度，但是当EGR废气需求较大时，此时EGR节流阀开度已开到最大也无法满足，则需要通过调节排气背压阀来提升EGR的引入，由于EGR废气的引气管路较长，也会存在瞬态响应滞后的问题；高低压EGR是指EGR废气从涡轮前引入，经过EGR冷却器，到压气机入口，与新鲜进气混合，经过二次冷却后，混合气均匀性更好、同时也拓宽了爆震边界；天然气发动机采用高低压EGR方案，经EGR冷却器冷却后，EGR废气温度一般为100℃-140℃，且含有大量水分，正常情况下，增压器压气机对低温低压的新鲜充量进行压缩做功，使低温低压新鲜充量转变为高温高压气体，以达到增压的作用，但是当大量高温高压水气进入到增压器压气机内，占据大量新鲜充量的体积，一方面会阻碍新鲜充量的引入，另一方面会阻碍压气机对新鲜充量的压缩做功，影响压气机的增压效率，从而影响 发动机的动力性等方面；其次由于EGR废气中含有大量的水分，也会对压气机起到腐蚀的作用，从而降低增压器的可靠性寿命，增加了天然气发动机不稳定的风险。
目前，现有的技术方案中对高低压EGR技术中的EGR废气无有效管理系统，当大量含有水分的高温高压EGR废气进入到压气机，会导致增压器压气机端的增压效率下降，也会对压气机叶轮起到腐蚀作用，严重影响了发动机的性能及可靠性。
以上背景技术内容的公开仅用于辅助理解本发明的发明构思及技术方案，其并不必然属于本专利申请的现有技术，在没有明确的证据表明上述内容在本专利申请的申请日已经公开的情况下，上述背景技术不应当用于评价本申请的新颖性和创造性。
发明内容
本发明针对以上问题，提供一种天然气发动机高低压EGR废气管理系统解决目前大量含有水分的高温高压EGR废气进入到压气机，导致增压器压气机端的增压效率下降，对压气机叶轮起到腐蚀作用，严重影响发动机的性能及可靠性的问题。
为了实现以上目的，本发明采用的技术方案如下：
一种天然气发动机高低压EGR废气管理系统，其特征在于，包括：发动机、排气歧管、涡轮增压器、EGR冷却器、EGR节流阀、冷却器、除水器、中冷器、节气门；
所述排气歧管与发动机连接；所述涡轮增压器与所述排气歧管连接；
所述EGR冷却器与所述排气歧管连接；所述EGR节流阀与所述EGR冷却器连接；所述冷却器与所述EGR节流阀连接；所述除水器与所述冷却器和涡轮增压器连接；
所述中冷器与所述涡轮增压器连接；所述节气门与所述中冷器和发动机连接。
进一步地，所述EGR冷却器接收排气歧管中排出的EGR废气并进行冷却。
进一步地，所述EGR节流阀控制进入所述冷却器的EGR废气量。
进一步地，所述冷却器对EGR废气进行二次冷却。
进一步地，所述除水器用于除去EGR废气中的水分。
进一步地，所述发动机排出的部分EGR废气经过所述EGR冷却器、EGR节流阀、冷却器和除水器进行冷却除水后通入涡轮增压器与空气混合再经过所述中冷器和节气门进入发动机。
进一步地，所述节气门控制进入所述发动机的混合气体量。
与现有技术相比，本发明的优点及有益效果为：
本发明在EGR节流阀后增加了冷却器和除水器，当EGR废气经过EGR节流阀后的温度在100℃-140℃，经过冷却器冷却后，能把温度控制在30℃-50℃，经过换热，冷却后的EGR废气中会含有更多的水分，通过在冷却器后加装除水器可以把废气中的大量水分除掉，除水器可以自动放水，可以满足持续使用的需求，通过降温除水后，进入到压气机入口的EGR废气转变成为低温低压、含少量水分的气体，从而减小了对新鲜充量进入到压气机的阻碍，降低了高温高压EGR废气在压气机中的体积占比，提高了压气机的增压效率，也减小了对压气机叶轮的腐蚀，由于EGR废气中的水分被除掉，可以有效的提高EGR率，获得更宽的爆震界限，实现有效的EGR废气管理，保证了发动机性能。
附图说明
图1为本发明EGR废气管理系统的示意图；
图2为现有EGR废气管理系统的示意图。
具体实施方式
下面结合具体实施方式对本发明作进一步详细说明。应该强调的是，下述说明仅仅是示例性的，而不是为了限制本发明的范围及其应用。
如图1和图2所示，所述一种天然气发动机高低压EGR废气管理系统，其特征在于，包括：发动机1、排气歧管2、涡轮增压器3、EGR冷却器4、EGR节流阀5、冷却器6、除水器7、中冷器8、节气门9；
所述排气歧管2与发动机1连接；所述涡轮增压器3与所述排气歧管2连接；
所述EGR冷却器4与所述排气歧管2连接；所述EGR节流阀5与所述EGR冷却器4连接；所述冷却器6与所述EGR节流阀5连接；所述除水器7与所述冷却器6和涡轮增压器3连接；
所述中冷器8与所述涡轮增压器3连接；所述节气门9与所述中冷器8和发动机1连接。
进一步地，所述EGR冷却器4接收排气歧管2中排出的EGR废气并进行冷却。
进一步地，所述EGR节流阀5控制进入所述冷却器6的EGR废气量。
进一步地，所述冷却器6对EGR废气进行二次冷却，将EGR废气降至30℃-50℃。
进一步地，所述除水器7用于除去EGR废气中的水分，除水器7可以自动放水，可以满足持续使用的需求。
进一步地，所述发动机1排出的部分EGR废气经过所述EGR冷却器4、EGR节流阀5、冷却器6和除水器7进行冷却除水后通入涡轮增压器3与空气混合再经过所述中冷器8和节气门9进入发动机，通过降温除水后，进入到压气机入口的EGR废气转变成为低温低压、含少量水分的气体，从而减小了对新鲜充量进入到压气机的阻碍，降低了高温高压EGR废气在压气机中的体积占比，提高了压气机的增压效率，也减小了对压气机叶轮的腐蚀，由于EGR废气中的水分被除掉，可以有效的提高EGR率，获得更宽的爆震界限，实现有效的EGR废气管理，保证了发动机性能。
进一步地，所述节气门控制进入所述发动机的混合气体量。
以上内容是结合具体的/优选的实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，其还可以对这些已描述的实施例做出若干替代或变型，而这些替代或变型方式都应视为属于本发明的保护范围。

Claims (7)

  1. 一种天然气发动机高低压EGR废气管理系统，其特征在于，包括：
    发动机、排气歧管、涡轮增压器、EGR冷却器、EGR节流阀、冷却器、除水器、中冷器、节气门；
    所述排气歧管与发动机连接；所述涡轮增压器与所述排气歧管连接；
    所述EGR冷却器与所述排气歧管连接；所述EGR节流阀与所述EGR冷却器连接；所述冷却器与所述EGR节流阀连接；所述除水器与所述冷却器和涡轮增压器连接；
    所述中冷器与所述涡轮增压器连接；所述节气门与所述中冷器和发动机连接。
  2. 根据权利要求1所述的一种天然气发动机高低压EGR废气管理系统，其特征在于：所述EGR冷却器接收排气歧管中排出的EGR废气并进行冷却。
  3. 根据权利要求1所述的一种天然气发动机高低压EGR废气管理系统，其特征在于：所述EGR节流阀控制进入所述冷却器的EGR废气量。
  4. 根据权利要求1所述的一种天然气发动机高低压EGR废气管理系统，其特征在于：所述冷却器对EGR废气进行二次冷却。
  5. 根据权利要求1所述的一种天然气发动机高低压EGR废气管理系统，其特征在于：所述除水器用于除去EGR废气中的水分。
  6. 根据权利要求1所述的一种天然气发动机高低压EGR废气管理系统，其特征在于：所述发动机排出的部分EGR废气经过所述EGR冷却器、EGR节流阀、冷却器和除水器进行冷却除水后通入涡轮增压器与空气混合再经过所述中冷器和节气门进入发动机。
  7. 根据权利要求1所述的一种天然气发动机高低压EGR废气管理系统，其特征在于：所述节气门控制进入所述发动机的混合气体量。
PCT/CN2022/142064 2022-01-26 2022-12-26 一种天然气发动机高低压egr废气管理系统 WO2023142832A1 (zh)

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CN116779909B (zh) * 2023-04-18 2024-04-30 雄川氢能科技(广州)有限责任公司 一种燃料电池空气供给系统

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