CN102341589B - Large Turbocharged Two-Stroke Diesel Engine With Exhaust- Or Combustion Gas Recirculation And Method For Reducing NOx And Soot Emissions - Google Patents

Large Turbocharged Two-Stroke Diesel Engine With Exhaust- Or Combustion Gas Recirculation And Method For Reducing NOx And Soot Emissions Download PDF

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CN102341589B
CN102341589B CN 200980157911 CN200980157911A CN102341589B CN 102341589 B CN102341589 B CN 102341589B CN 200980157911 CN200980157911 CN 200980157911 CN 200980157911 A CN200980157911 A CN 200980157911A CN 102341589 B CN102341589 B CN 102341589B
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fuel
water
exhaust gas
gas recirculation
flow
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CN 200980157911
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CN102341589A (en )
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斯特凡·马耶尔
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曼恩柴油机涡轮公司,曼恩柴油机涡轮德国公司子公司
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B25/00Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/02Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
    • F02B25/04Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel, or fuel-air mixture
    • F02M25/022Adding fuel and water emulsion, water or steam
    • F02M25/025Adding water
    • F02M25/03Adding water into the cylinder or the pre-combustion chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02EGR systems specially adapted for supercharged engines
    • F02M26/04EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05High 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23Layout, e.g. schematics
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35Arrangement 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/41Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00Fuel-injection apparatus operating simultaneously on two or more fuels or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/02Pumps peculiar thereto
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Technologies for the improvement of indicated efficiency of a conventional ICE
    • Y02T10/121Adding non fuel substances or small quantities of secondary fuel to fuel, air or fuel/air mixture

Abstract

一种十字头式大型二冲程涡轮增压柴油发动机设置有排气再循环系统和燃料喷射系统,该燃料喷射系统能够在特定运行条件下、例如在高排气再循环率下选择性地向燃料流加水以由此增加通过喷嘴的质量流。 One kind of large two-stroke crosshead type diesel engine provided with a turbocharger exhaust gas recirculation system and a fuel injection system, the fuel injection system can be, for example, selectively to the fuel at a high exhaust gas recirculation rate under certain operating conditions water was added to thereby increase the flow through the mass flow of the nozzle. 增加的、通过喷嘴的质量流改进了新鲜进气到高速燃料射流中的掺入并且由此增加了燃料/空气混合并且使得燃烧朝向稀薄侧并且因此抑制了碳烟形成。 Increased, flow through the nozzle is improved mass of fresh intake air to the high speed fuel jet and thereby increasing the incorporation of the fuel / air mixture and the combustion toward the lean side and thus suppresses the formation of soot.

Description

带有排气或者燃烧气体再循环的大型涡轮增压二冲程柴油发动机和用于减少NOx和碳烟排放的方法 A large turbocharged two-stroke diesel engine with a combustion or exhaust gas recirculation and methods for reducing NOx and soot emissions

技术领域 FIELD

[0001] 本发明涉及使用排气再循环以减少NOx形成的大型涡轮增压二冲程柴油发动机和一种用于使用排气或者燃烧气体再循环而减少NOx形成的、操作大型涡轮增压二冲程柴油发动机的方法。 [0001] The present invention relates to an exhaust gas recirculation to reduce NOx formation of large turbocharged two-stroke diesel engine and a method for using a combustion or exhaust gas recirculation to reduce NOx formation, operation of large two-stroke turbocharged a diesel engine.

背景技术 Background technique

[0002]目前,存在用于利用被应用于发动机过程的改变而减少在大型二冲程柴油发动机中的NOx形成的多个选项,特别地以下选项: [0002] Currently, there are several options for reducing the NOx formed in the large two-stroke diesel engine applied to the engine is changed by the process, in particular the following options:

[0003] 籲排气再循环(EGR) [0003] Calls exhaust gas recirculation (EGR)

[0004] •水乳化燃料的使用。 [0004] • using the water-emulsion fuel.

[0005] •新鲜进气增湿,即扫气空气加湿(SAM)。 [0005] • fresh intake air humidification, i.e. the scavenging air humidification (SAM).

[0006] 最有效的减少方法是EGR。 [0006] The most effective method is to reduce the EGR. 文献DE 19809618公开了一种带有排气再循环的大型二冲程涡轮增压柴油发动机(在这个发动机中,直接地从气缸获取气体并且因此这种形式的EGR还被称作燃烧气体再循环-CGR)。 Document DE 19809618 discloses a turbine of one kind having large two-stroke supercharged diesel engine exhaust gas recirculation (in this engine, the direct access from the gas cylinder and thus also referred to this form of combustion gas recirculation EGR - CGR). 当在本文献中提到“排气再循环”时,这意味着涵盖从排气获取的气体和直接地从气缸获取的气体这两者的再循环。 When referring to "exhaust gas recirculation" In the present document, this means the exhaust gas taken from the cover and directly obtained from a gas recycle of both cylinders.

[0007] 在排气再循环中,排气被与清洁的扫气空气混合从而在压缩开始时减小扫气空气的氧含量,由此实现了降低在燃烧过程期间形成NOx的机会。 [0007] In the exhaust gas recirculation, the exhaust gas is mixed with the cleaning of scavenging air to reduce the oxygen content of the scavenging air at the start of compression, thereby reducing the opportunity to achieve the NOx formation during the combustion process.

[0008] 为了满足将来的排放要求所需的高EGR率(即相对于扫气空气流较高的再循环排气流)从未被应用于大型二冲程柴油发动机。 [0008] In order to meet future emission requirements to high EGR rates (i.e., with respect to a higher flow of scavenging air recirculated exhaust gas flow) has never been applied to large two-stroke diesel engine. 高EGR率在小型柴油发动机中已经表现出导致过度的碳烟形成。 High EGR rates in small diesel engines have been shown to result in excessive soot formation. 在小型柴油发动机中,碳烟排放的这个增加已经迫使发动机开发者通过采用更高的燃料喷射压力而确保更好的混合和掺气。 In a small diesel engine, the smoke emission increased carbon has forced engine developers through the use of higher fuel injection pressure and ensure better mixing and aeration. 然而,更高燃料喷射压力导致NOx形成的某种增加并且因此在某种程度上减弱了起初获得的NOx减少。 However, the higher the fuel injection pressure increases result in some NOx formation and thus reducing NOx somewhat weakened initially obtained. 在这条路线上,小型柴油发动机的设计者已经被迫在相应地增加燃料喷射压力的情况下使用越来越高的EGR率。 In this route, the designer has been forced to small diesel engines using high EGR ratio more in a case where a corresponding increase in fuel injection pressure. 目前,在小型柴油发动机中的燃料压力经常具有高于2000巴的值并且在这种压力水平下的燃料流控制在技术上是非常高要求的和高成本的并且将经常产生耐久性问题。 Currently, the fuel pressure in the small diesel engines often have a value higher than 2000 bars and the fuel pressure level in this flow control technically very demanding and costly and often results in the problem of durability.

[0009] 由于大型二冲程柴油发动机的庞大的尺寸和规模,为了在小型柴油发动机中在这些高压力下控制燃料而研发的技术不能被直接地应用于大型二冲程柴油发动机。 [0009] Because of the large size and the size of large two-stroke diesel engine, small diesel engines in order to control the fuel at these high pressures developed in the art it can not be applied directly to the large two-stroke diesel engine. 因此,在燃料喷射系统中使用这种高压力将要求在用于开发能够应对这些极高压力的、用于大型二冲程柴油发动机的燃料喷射系统的新技术中的大量投入。 Thus, the use of such a high pressure fuel injection system will be used to develop the required extremely high pressures can meet these, new techniques for a fuel injection system of the large two-stroke diesel engine of the large number of inputs.

发明内容 SUMMARY

[0010] 根据该背景,本发明的一个目的在于提供一种大型二冲程涡轮增压柴油发动机,其能够以高EGR率运行、而无需在发动机中以极高燃料压力运行。 [0010] According to this background, an object of the present invention is to provide a large two-stroke turbocharged diesel engine, which is capable of operating at a high EGR rate, without having to run at very high fuel pressure in the engine.

[0011] 通过提供一种十字头式大型涡轮增压二冲程柴油发动机实现了这个目的,该二冲程柴油发动机包括多个气缸、排气再循环气体再循环系统、燃料喷射系统,该燃料喷射系统用于向气缸提供通过喷嘴而被喷射到气缸中的高压燃料,其中排气再循环率是可变的,该燃料喷射系统能够选择性地向通过喷嘴的燃料流加水,并且该燃料喷射系统被构造成通过根据实际排气再循环率向燃料流加水而增加通过喷嘴的质量流。 [0011] achieved by providing a crosshead type large turbocharged two-stroke diesel engine of this object, the two-stroke diesel engine comprises a plurality of cylinders, an exhaust gas recirculation gas recirculation system, the fuel injection system, the fuel injection system for providing through the nozzle is injected into the cylinder high-pressure fuel to the cylinder, wherein the exhaust gas recirculation rate is variable, the fuel injection system is capable of selectively adding water to the fuel flow through the nozzle, and the fuel injection system is configured by the nozzle is increased by the mass flow rate of the stream based on the actual exhaust gas recirculation adding water to the fuel.

[0012] 通过当排气再循环率是高的时增加通过喷嘴的质量流,所喷射的流体的动量增加并且由此改进了在否则将会导致高度碳烟形成的运行条件下在高速燃料射流中掺入新鲜进气。 [0012] By the time when the exhaust gas recirculation rate is increased by the high mass flow of the nozzle, increasing the momentum of the injected fluid and thereby improving the height under otherwise cause soot formation in a high speed operating conditions the fuel jet incorporating fresh intake air. 因此,避免了过度碳烟形成,同时仍然获得了低的NOx值,而无需使用极高的燃料喷射压力。 Accordingly, excessive soot formation is avoided, while still obtaining the low NOx values, without using extremely high fuel injection pressure.

[0013] 在燃料中使用水将另外地降低燃烧温度并且因此进一步减少NOx的形成。 [0013] In addition to reducing the combustion temperature and thus NOx formation is further reduced with water in the fuel.

[0014] 根据一个实施例,当排气循环比高于预定阈值时使用预定的燃水比。 [0014] According to one embodiment, when the exhaust gas recycling water predetermined fuel ratio is higher than a predetermined threshold ratio.

[0015] 根据一个实施例,气缸每一个均具有至少两个独立的喷嘴,带有较小的孔的至少一个喷嘴用于当无水流被添加到燃料流时使用,并且带有较大的孔的至少一个喷嘴用于当水流被添加到燃料流时使用。 [0015] According to one embodiment, each cylinder has at least two separate nozzles with smaller apertures at least one nozzle for, when no water is added to the flow of fuel used, and with larger holes at least one nozzle for the flow of water when used is added to the fuel stream. 因此,带有较大的孔的喷嘴能够适应增加的燃料流。 Thus, nozzles with larger holes can be adapted to increase the fuel flow.

[0016] 根据进一步的实施例,水和燃料被乳化并且通过喷嘴喷射燃料/水混合物。 [0016] According to a further embodiment, the fuel and water are emulsified and the fuel / water mixture is sprayed through the nozzle.

[0017] 根据另一实施例,当水被添加到燃料流时,燃料喷射流量不变。 [0017] According to another embodiment, when water is added to the fuel flow, the fuel injection flow rate constant. 因此,当发动机在水-燃料运行和纯燃料运行之间改变时,发动机将接收相同数量的燃料并且能够继续以相同载荷运行。 Thus, when the engine water - fuel operation when changing between the run and the pure fuel, the engine will receive the same amount of fuel and can continue to run at the same load.

[0018] 根据另一实施例,当水被添加到燃料流时,燃料喷射压力不变。 [0018] According to another embodiment, when water is added to the fuel flow, fuel injection pressure constant. 因此,发动机将在水-燃料运行中以与在纯燃料运行中基本相同的燃料压力运行。 Thus, the engine water - operating in the pure fuel running substantially the same fuel pressure in the fuel running.

[0019] 根据又一个实施例,该发动机被构造成在不向燃料流加水的情况下在高载荷下以中等EGR率运行。 [0019] According to a further embodiment, the engine is configured to operate at high loads without adding water to the fuel stream at a moderate EGR rate.

[0020] 根据另一实施例,通过排气循环系统的质量流与发动机载荷无关地被保持是基本恒定的。 [0020] According to another embodiment, the mass flow through the exhaust gas recirculation system and the engine load is kept substantially constant regardless.

[0021] 根据进一步的实施例,该排气再循环系统设置有气涤器并且所述气涤器的尺寸被确定为对于通过排气再循环系统的基本恒定的质量流而言是足够的。 [0021] According to a further embodiment, the exhaust gas recirculation system is provided with a scrubber and the scrubber size is determined to be sufficient for the exhaust gas recirculation system by substantially constant mass flow.

[0022] 根据一个实施例,该燃料喷射系统包括燃料和水乳化系统。 [0022] According to one embodiment, the fuel injection system includes a fuel and water emulsion systems.

[0023] 根据一个实施例,该燃料喷射系统能够选择性地利用纯燃料运行,且选择性地利用水和燃料的混合物运行。 [0023] According to one embodiment, the fuel injection system can selectively use the pure fuel operation, and selectively use a mixture of water and fuel operation.

[0024] 根据一个实施例,该发动机进一步包括控制燃料喷射系统的运行的电子控制单元,并且所述电子控制单元被构造成确定何时通过向燃料加水而增加通过喷嘴的质量流。 [0024] According to one embodiment, the engine further comprising an electronic control unit for controlling operation of a fuel injection system, and the electronic control unit is configured to determine when the fuel by adding water to the nozzle is increased by the mass flow.

[0025] 本发明的另一个目的在于提供一种用于在十字头式大型涡轮增压二冲程柴油发动机中控制燃料喷射的方法,该方法包括在发动机中以具有可变排气再循环率的排气再循环而运行,所述发动机设置有燃料喷射系统并且通过向燃料加水而选择性地增加通过喷嘴的质量流以由此增加所喷射的液体的动量。 [0025] Another object of the present invention is to provide a method for controlling fuel injection in the crosshead type large turbocharged two-stroke diesel engine, the method comprising in an engine having a variable exhaust gas recirculation rate exhaust gas recirculation operation, the engine is provided with a fuel injection system and the fuel by adding water to selectively increase the flow to thereby increase the liquid injected by the nozzle momentum mass.

[0026] 根据一个实施例,水和燃料被乳化从而向燃料加水并且由此增加通过喷嘴的质量流。 [0026] embodiment, the fuel and water is emulsified thereby adding water to the fuel in accordance with one embodiment of the nozzle and thereby increase the mass flow through.

[0027] 根据另一实施例,当超过给定的排气再循环率时,将水通过喷嘴添加到所述流中。 [0027] According to another embodiment, when more than a given exhaust gas recirculation rate, water was added to the flow through the nozzle.

[0028] 根据一个实施例,通过排气再循环系统的质量流与发动机载荷无关地被保持是基本恒定的。 [0028] According to one embodiment, the exhaust gas recirculation mass flow regardless of the engine load is held substantially constant.

[0029] 根据一个实施例,带有较大开口的喷嘴被用于当水被添加到燃料流时的燃料喷射,并且带有较小开口的喷嘴被用于当没有水被添加到燃料流时的燃料喷射。 [0029] According to one embodiment of the nozzle, the nozzle having a larger opening is used when water is added to the fuel of the fuel injection flow, and with a smaller opening is used when no water is added to the fuel flow when fuel injection.

[0030] 根据一个实施例,被添加到燃料的水的水量相关于排气再循环率地受到控制。 [0030] Related to the exhaust gas recirculation rate is controlled according to the amount of water in one embodiment, it is added to the fuel.

[0031] 根据详细说明,根据本发明的大型二冲程柴油发动机和方法的进一步的目的、特征、优点和性质将变得显见。 [0031] detailed description, according to a further object of the large two-stroke diesel engine and method of the invention, the features, properties and advantages will become apparent.

附图说明 BRIEF DESCRIPTION

[0032] 在本说明书的以下详细部分中,将参考在图中所示示例性实施例更加详细地解释本发明,其中: [0032] In the following detailed part of the present specification, the present invention will be explained with reference to which in more detail the exemplary embodiment shown in the drawings:

[0033] 图1是根据本发明的一个实施例的十字头式大型二冲程柴油发动机的图解示意; [0033] FIG. 1 is a schematic diagrammatic large two-stroke crosshead type diesel engine according to an embodiment of the present invention;

[0034] 图2是根据本发明的另一个实施例的十字头式大型二冲程柴油发动机的图解示 [0034] FIG. 2 is a diagram illustrating a large two-stroke crosshead type diesel engine according to another embodiment of the present invention.

思; think;

[0035] 图3是根据本发明的另一个实施例的十字头式大型二冲程柴油发动机的图解示 [0035] FIG. 3 is a diagram illustrating a large two-stroke crosshead type diesel engine according to another embodiment of the present invention.

思; think;

[0036] 图4是根据本发明的又一个实施例的十字头式大型二冲程柴油发动机的图解示 [0036] FIG. 4 is an illustration of a large two-stroke crosshead type diesel engine of still another embodiment of the present invention is shown

意。 meaning. 具体实施方式 detailed description

[0037] 以下将通过优选实施例描述根据本发明的十字头式大型涡轮增压二冲程柴油发动机和用于操作十字头式大型涡轮增压二冲程柴油发动机的方法的详细说明。 [0037] The following detailed description will be described in accordance with the present invention crosshead large turbocharged two-stroke diesel engine and method for operating a crosshead-type large turbocharged two-stroke diesel engine by the preferred embodiment.

[0038] 十字头式大型涡轮增压柴油发动机的构造和运行是同样众所周知的并且在本文中不需要进一步的解释。 [0038] The construction and operation of the crosshead type large turbocharged diesel engines are also well known and need no further explanation herein. 在下面提供了关于燃料喷射和排气系统的运行的进一步的细节。 Below provides further details regarding operation of the fuel injection and exhaust system.

[0039] 图1示出根据本发明的大型二冲程柴油发动机I的第一实施例。 [0039] FIG. 1 shows a first embodiment of a large two-stroke diesel engine in accordance with the present invention I. 发动机I可以例如被用作在海洋中行进的船舶中的主发动机或者被用作用于操作电站中的发电机的固定发动机。 I, for example, the engine may be used as a ship traveling in the sea or in the main engine is used as stationary engines of power plants the operation of the generator. 发动机的总输出可以例如具有从5,OOOkff到110,OOOkff的范围。 The total output of the engine may for example have from 5, OOOkff to a range of 110, OOOkff of.

[0040] 该发动机设置有并列地成一直线布置的多个气缸2。 [0040] The engine is provided with a plurality of parallel cylinders arranged in line 2. 每一个气缸2均设置有与它们的气缸盖相关联的排气门3。 Each cylinder 2 has associated with their cylinder head exhaust valve 3 are arranged. 排气通道能够被排气门3打开和关闭。 Exhaust valve exhaust passage 3 can be opened and closed. 排气弯管4连接到排气接收器5。 4 exhaust manifold 5 is connected to the exhaust gas receiver. 排气接收器5被置放成平行于一排气缸2。 Exhaust gas receiver 5 is disposed parallel to a row of the cylinder 2. 从排气接收器5,排气经由排气管8而被朝向涡轮增压器6的涡轮引导。 The receiver 5 from the exhaust gas, the exhaust gas through the exhaust pipe 8 is guided toward the turbine 6 of a turbocharger. 排气被置于涡轮下游的大气中。 Exhaust air is disposed downstream of the turbine.

[0041] 涡轮增压器7还包括被连接到新鲜空气入口的压缩机。 [0041] 7 further comprising a turbocharger compressor is connected to the fresh air inlet. 压缩机经由扫气空气冷却器10和扫气空气导管11向扫气空气接收器9输送高压扫气空气。 The compressor delivers high pressure scavenging air via the scavenging air cooler 10 and the scavenging air duct 11 to the scavenging air receiver 9. 扫气空气被从充气接收器9传送到各个气缸2的扫气空气端口12。 It is transferred from the scavenging air receiver 9 to the respective pneumatic cylinder scavenging air port 12 2.

[0042] 经由排气再循环端口13,燃烧气体的一部分被导引至排气接收器14。 [0042] 13 via an exhaust gas recirculation port, part of the combustion exhaust gas is guided to a receiver 14. 排气接收器14经由调节通过排气再循环系统的质量流的控制阀15、净化被再循环的排气的气涤器16、冷却器17和水雾捕集器18而连接到扫气空气导管11,该水雾捕集器18移除例如被添加到气涤器16中的气流的水滴。 The exhaust gas receiver 14 via the control valve regulating the exhaust gas recirculation system 15 of mass flow, recirculated exhaust gas purifying scrubber 16, cooler 17 and the mist trap 18 is connected to the scavenging air conduit 11, the mist trap 18 is removed, for example, is added to the stream of water droplets in the gas scrubber 16.

[0043] 通过排气再循环系统的质量流与发动机载荷无关地被保持是基本恒定的。 [0043] The exhaust gas recirculation system through mass flow regardless of the engine load is held substantially constant. 因此,在低发动机载荷(例如低于连续最大额定值的大致75%)下,排气再循环比是较高的,并且在高发动机载荷(例如高于连续最大额定值的75% )下,排气再循环比是比较中等的。 Thus, at low engine load (e.g. less than the maximum continuous rating of approximately 75%), exhaust gas recirculation ratio is higher, and the engine load is high (e.g., greater than 75% of the maximum continuous rating), the It is more moderate than the exhaust gas recirculation. 排气气涤器16的尺寸被精确地确定为对于在这些高载荷运行条件下处理被再循环的排气流而言是足够的。 Size of the exhaust gas scrubber 16 is accurately determined in terms of processing for the recirculated exhaust gas stream at the high load operating conditions are sufficient. 在不采取对策的情况下,在低发动机载荷和相应地高排气再循环率下的碳烟形成将是不可接受地高的。 In the case where no countermeasure is taken in the low engine load and accordingly the soot is formed of a high exhaust gas recirculation rate will be unacceptably high.

[0044] 然而,该发动机装配有特别地合适的燃料喷射系统,该燃料喷射系统包括燃料罐20和水燃料乳剂罐21。 [0044] However, the engine is equipped with a particularly suitable fuel injection system, the fuel injection system includes a fuel tank 20 and water tank 21 of the fuel emulsion. 该发动机还可以包括燃料-水乳化系统(未示出)。 The engine may further include a fuel - water emulsifying system (not shown). 燃料罐20被连接到向共轨23输送高压燃料的高压燃料泵22。 The fuel tank 20 is connected to the high pressure fuel pump 22 delivers high pressure fuel to the common rail 23. 共轨23为多个气缸2提供经由燃料阀24而被喷射到气缸2中的高压燃料。 The common rail 23 is supplied through a plurality of cylinders 2 fuel valve 24 is injected into the high pressure fuel in the cylinder 2. 燃料阀24的喷嘴设置有较小的孔隙,燃料通过该孔隙被分散到气缸2内侧的燃烧室中。 The fuel valve nozzle 24 is provided with a smaller pores, the fuel is dispersed into the combustion chamber inside the cylinder 2 through the aperture. 燃料阀24的运行由电子控制单元(未示出)控制。 Operation of the fuel valve 24 is controlled by an electronic control unit (not shown). 每一气缸2能够存在多于一个例如两个或者三个燃料阀24并且这些燃料阀24全部被连接到共轨23。 Each cylinder 2 can be more than one, for example two or three fuel valves 24 and the fuel valve 24 are all connected to the common rail 23.

[0045] 该燃料喷射系统还包括高压燃料泵25,其将燃料-水乳剂在高压下从罐21泵送到共轨26中。 [0045] The fuel injection system further comprises a high pressure fuel pump 25, which fuel - water emulsion at a high pressure to the common rail 26 from the tank 21 of the pump. 共轨26为多个气缸2提供经由燃料阀27而被喷射到气缸2中的高压燃料-水乳剂。 The common rail 26 is supplied through a plurality of cylinders 2 fuel valve 27 is injected into the cylinders 2 in the high pressure fuel - water emulsion. 燃料阀27的喷嘴设置有较大的孔隙,燃料-水乳剂通过该孔隙被分散到气缸2内侧的燃烧室中。 The fuel valve nozzle 27 is provided with a large aperture, the fuel - water emulsion is dispersed into the combustion chamber inside the cylinder 2 through the aperture. 燃料阀27的运行由电子控制单元控制。 Operation of the fuel valve 27 controlled by an electronic control unit. 每一气缸2能够存在多于一个例如两个或者三个燃料阀27,并且这些燃料阀27全部被连接到共轨26。 Each cylinder 2 can be more than one, for example two or three fuel valves 27, 27 and the fuel valve 26 are all connected to the common rail.

[0046] 与发动机载荷无关地,该电子控制单元在运行期间经由控制阀15保持通过排气再循环系统的质量流是基本恒定的。 [0046] irrespective of the engine load, the electronic control unit held by an exhaust gas recirculation system is substantially constant mass flow through the control valve 15 during operation. 与在中等和低载荷(例如低于最大连续额定值的75%)下相比,在较高的发动机载荷下,通过空气进入系统的质量流是基本上更高的。 Than at medium and low load (e.g. less than 75% of maximum continuous rating), the higher the engine load, the mass flow of air through the system is substantially higher. 这意味着与在闻载荷(例如闻于最大连续额定值的75% )下相比,在中等和低载荷下,排气再循环率是基本上更闻的。 This means that compared to the smell load (e.g. heard in 75% of the maximum continuous rating), the middle and at low load, the exhaust gas recirculation rate is substantially more audible.

[0047] 在于高载荷下运行期间,该发动机控制单元操作高压燃料泵22和燃料喷射阀24以通过燃料喷射阀24将纯燃料喷射到气缸2内侧的燃烧室中。 [0047] wherein during operation under high load, the engine control unit operates the high-pressure fuel pump 22 and the fuel injection valves 24 through the fuel injection valve 24 to inject fuel into the combustion chamber of pure 2 inside the cylinder. 由于较低的EGR率,在这些运行条件下,碳烟形成并不是太高的。 Due to the lower EGR rate under these operating conditions, the soot is formed is not too high.

[0048] 当发动机在不较高的载荷下运行并且排气再循环率高于预定阈值时,电子控制单元中断燃料喷射阀24和高压燃料泵22的运行并且替代地运行高压泵25和燃料喷射阀27以将燃料-水混合物或者乳剂喷射到气缸2中的燃烧室中。 [0048] When the engine is running at high load and without recirculation exhaust gas is higher than a predetermined threshold value, the electronic control unit interrupts the operation of the fuel injection valve 24 and the high pressure fuel pump 22 and the high pressure pump 25 alternatively operates the fuel injection and the fuel valve 27 - water mixture or emulsion injected into the combustion chamber in the cylinder 2. 在从利用纯燃料的运行到利用燃料-水混合物或者乳剂的运行和反之的转变期间,喷射的燃料量是基本不变的。 In the run using the pure fuel to the fuel - water mixture during the transition operation and vice versa, or emulsion, amount of fuel injected is substantially constant. 喷射燃料和燃料-水乳剂的压力是相同的,即高压燃料泵22和高压燃料泵25在基本相同的压力下运行。 The fuel injection and fuel - water emulsion pressure is the same, i.e., the high-pressure fuel pump 22 and the high pressure fuel pump 25 to run at substantially the same pressure. 这个压力能够在与通常在800到1200巴的范围中的、被用于大型二冲程柴油发动机的、传统的共轨燃料喷射系统的压力相同的范围中。 This pressure can be in the same generally in the range of 800 to 1200 bar, and is used in large two-stroke diesel engine, the conventional common rail fuel injection system pressure range.

[0049] 当水被添加到燃料时增加的、通过喷嘴的质量流改进了新鲜进气到高速燃料射流中的掺入并且由此增加了燃料/空气混合并且使得燃烧朝向稀薄侧并且因此抑制了碳烟形成。 [0049] increases when water is added to the fuel through the nozzle mass flow of fresh intake air to improve the high speed fuel jet and thereby increasing the incorporation of the fuel / air mixture and the combustion toward the lean side and thus suppresses soot formation.

[0050] 当排气再循环率降至低于预定阈值时,发动机控制单元恢复高压燃料泵22和燃料阀24的运行并且中断高压燃料泵25和燃料阀27的运行。 [0050] When the exhaust gas recirculation rate falls below a predetermined threshold value, the engine control unit 22 resumes the high-pressure fuel pump and a fuel valve 24 and interrupt the high-pressure fuel pump 25 and fuel valve 27.

[0051]图2示意本发明的第二实施例,除了排气再循环系统将再循环的排气直接地返回气缸而不将其混合到扫气空气系统中之外,第二实施例与第一实施例大致相同。 [0051] FIG 2 illustrates a second embodiment of the present invention, in addition to the recirculated exhaust gas recirculation system is exhaust gas return cylinder without directly mixed into scavenging air outside the system, the second embodiment and the second embodiment an embodiment is substantially the same.

[0052] 图3示意本发明的第三实施例,除了水和燃料在燃料泵22内侧混合之外,第三实施例与第一实施例基本相同。 [0052] FIG. 3 schematically a third embodiment of the present invention, in addition to water and mixed inside the fuel outside the fuel pump 22, the third embodiment is substantially the same as the first embodiment. 燃料泵在该实施例中具有能够以可变方式混合一定量的水与燃料的类型。 The fuel pump of a type capable of variably mixing an amount of water to fuel in this embodiment. 被与燃料混合的水量由电子控制单元确定并且泵22根据来自电子控制单元的信号混合该量的水。 Amount of water mixed with fuel is determined by the electronic control unit and the pump 22 of the mixing amount of water according to a signal from the electronic control unit. 电子控制单元还确定使用在它们的喷嘴中带有小孔隙的燃料阀24还是在它们的喷嘴中带有大孔隙的燃料阀27。 The electronic control unit also determines the use of the fuel valve with a small aperture in their nozzles 24 or the fuel valve with a large aperture 27 in the nozzle thereof. 被与燃料混合的水量在该实施例中能够在零和预定最大值(阶梯式的或者逐渐的)之间变化,或者被与燃料混合的水量能够以开/关方式地是固定的量。 The amount of water mixed with fuel in the embodiment can be varied between zero and a predetermined maximum value (gradually or stepwise) in this embodiment, is or can be water mixed with fuel in an on / off manner to a fixed amount.

[0053] 图3还包括可选的反馈控制系统用于调节被与燃料混合的水量。 [0053] FIG 3 also includes an optional feedback control system for regulating the amount of water is mixed with the fuel. 关于此,发动机I设置有NOx传感器28,该NOx传感器28测量在排气管8中的排气的NOx含量或者如在涡轮增压器7下游所示。 In this regard, the engine 28 I is provided with a NOx sensor, the NOx sensor 28 measures the NOx content of the exhaust gas in the exhaust pipe 8, or as in the downstream of the turbocharger 7. 来自NOx传感器28的信号被馈送到控制箱29 (电子控制单元)。 Signal from the NOx sensor 28 is fed to a 29 (electronic control unit) control box. 控制箱29将接收关于其它发动机运行参数诸如发动机载荷和排气再循环率的数据,并且基于这些数据,该控制器确定多少水(如果存在任何一些的话)应该被添加到燃料流并且相应地对燃料泵22发出命令。 The control box 29 to receive data regarding other engine operating parameters such as engine load and exhaust gas recirculation rate, based on these data, the controller determines how much water (if it exists any number) should be added to the fuel flow and accordingly of The fuel pump 22 to issue commands. 控制器29在一个实施例中还可以被构造成在反馈控制环中调节排气再循环率。 In one embodiment, controller 29 may also be configured to adjust the exhaust gas recirculation rate in a feedback control loop.

[0054] 图4示意本发明的第四实施例,除了水和燃料在高压燃料泵22和水泵25下游混合之外,第四实施例与第一实施例基本相同。 [0054] Figure 4 illustrates a fourth embodiment of the present invention, in addition to water and fuel mix 25 outside the high pressure fuel pump 22 and downstream of the pump, a fourth embodiment of the first embodiment is substantially the same embodiment. 这些泵22、25的出口汇合并且被连接到将燃料-水混合物输送到喷射阀24的导管23。 The pump outlet 22 and 25 merge and is connected to the fuel - water mixture is conveyed to the conduit 23 of the injection valve 24. 在该实施例中,水和燃料泵是可变排量类型的,但是通过为泵使用可变速度,该实施例还能够在没有可变排量的情况下实现。 In this embodiment, the water and the fuel pump is a variable displacement type, but can also be achieved in the absence of the case by using a variable displacement pump of variable speed, this embodiment.

[0055] 上述实施例已经示意为带有排气再循环系统,该排气再循环系统从气缸2的底部处的端口获取将被再循环的排气。 [0055] The above-described embodiments have been illustrated as having exhaust gas recirculation system, exhaust gas recirculation system which is to be acquired from the recirculated exhaust port at the bottom of the cylinder 2. 然而,还能够结合如下的排气再循环系统使用本发明,该排气再循环系统例如经由被置放在气缸盖中的排气再循环阀而从气缸的顶部获取排气。 However, the following is also capable of binding to an exhaust gas recirculation system of the present invention, the exhaust gas recirculation system, for example, acquired from the top of the cylinder via the exhaust gas is disposed in a cylinder head of an exhaust gas recirculation valve. 而且,再循环排气的返回也能够在气缸的顶部处。 Furthermore, it can be recycled back to the top of the cylinder exhaust gas.

[0056] 参考使用燃料罐和燃料-水乳剂罐的燃料喷射系统示意了上述实施例。 [0056] Referring fuel tanks and fuel - water emulsion tank schematically a fuel injection system of the above embodiment. 然而,本发明还能够与以另一种方式引入所要求的水量的系统一起使用。 However, the present invention also the amount of water required by the system can be introduced and used together in another way. 能够使用带有水进口且带有燃料进口并且在泵的内侧混合该两种流体的高压燃料泵从而该系统将仅仅需要水罐和燃料罐。 It can be used with high pressure fuel pump having a water inlet and a fuel inlet and mixing the two fluids inside the pump so that the system will only require water tank and the fuel tank. 这种燃料喷射系统能够在流入燃料喷射系统中的水流的可变大小的情况下运行,并且能够与排气再循环比相关地确定水流大小,即这种系统能够以可变燃水比运行并且能够与实际EGR比相关地确定该燃水比。 Such a fuel injection system capable of operation in the case of a variable size into the fuel injection system of the water flow can be recycled and to determine the exhaust flow ratio in relation to the size, i.e., such a system can be run at a variable ratio of fuel and water actual EGR ratio can be determined in relation to the water-fuel ratio.

[0057] 如在权利要求中使用的术语“包括”并不排除其它元件或者步骤。 [0057] As used in the claims, the term "comprising" does not exclude other elements or steps. 如在权利要求中使用的术语“a (—个)”或者“an (—个)”并不排除多个。 The terms used in the claims, "a (- a)" or "an (- a)" does not exclude a plurality.

[0058] 在权利要求中使用的参考符号不应该被理解成限制范围。 [0058] The reference symbols used in the claims should not be construed as limiting the scope.

[0059] 虽然已经为了示意的意图详细描述了本发明,但是应该理解这种细节仅仅是为此目的的,并且在不偏离本发明的范围的情况下,本领域技术人员能够在其中作出变化。 [0059] While there has been described in detail for illustrative purposes of the present invention, it is to be understood that such detail is solely for that purpose, and without departing from the scope of the invention, those skilled in the art can make variations therein.

Claims (18)

  1. 1.一种十字头式大型涡轮增压二冲程柴油发动机(I),包括: 多个气缸(2), 排气再循环系统, 用于为所述气缸(2)提供高压燃料的燃料喷射系统,所述高压燃料通过喷嘴而被喷射到所述气缸中, 其特征在于: 排气再循环率是可变的, 所述燃料喷射系统能够选择性地将水加至通过所述喷嘴的燃料流,并且所述燃料喷射系统被构造成通过根据实际排气再循环率向所述燃料流加水而增加通过所述喷嘴的质量流,当水流被加到所述燃料流时,燃料喷射流量是不变的。 A crosshead type large turbocharged two-stroke diesel engine (the I), comprising: a plurality of cylinders (2), an exhaust gas recirculation system for said cylinder (2) providing a high-pressure fuel fuel injection system the high-pressure fuel is injected into the cylinder through a nozzle, wherein: the exhaust gas recirculation rate is variable, the fuel injection system is capable of selectively water to flow through the nozzle of the fuel , and the fuel injection system is configured by increasing the actual flow rate of exhaust gas recirculation adding water to the fuel mass flow through the nozzle, when water is added to the fuel flow, the fuel injection flow rate is not changing.
  2. 2.根据权利要求1所述的大型涡轮增压二冲程柴油发动机(I ),其中当所述排气再循环率高于预定阀值时,使用预定的燃水比。 The large turbocharged two-stroke diesel engine (I) according to claim 1, wherein when the exhaust gas recirculation rate is higher than a predetermined threshold value, using a predetermined fuel-water ratio.
  3. 3.根据权利要求1所述的大型涡轮增压二冲程柴油发动机(1),其中所述气缸(2)每一个均具有至少两个喷嘴,带有较小的孔的至少一个喷嘴用于当没有水流被加到所述燃料流时使用,而带有较大的孔的至少一个喷嘴用于当水流被加到所述燃料流时使用。 The large turbocharged two-stroke diesel engine (1) according to claim 1, wherein said cylinder (2) each having at least two nozzles, with smaller holes for, when at least one nozzle when no water is supplied using the fuel flow, and with larger holes for use of at least one nozzle when the water flow is added to the fuel stream.
  4. 4.根据权利要求1所述的大型二冲程柴油发动机(1),其中水和燃料被乳化,并且,通过所述喷嘴喷射燃料/水混合物。 The large two-stroke diesel engine according to (1), wherein the fuel and water are emulsified, and the claims, through the nozzle of the fuel / water mixture ejection.
  5. 5.根据权利要求1所述的大型二冲程柴油发动机(I),其中当水被加到所述燃料流时,燃料喷射压力是不变的。 The large two-stroke diesel engine of claim 1 (I), wherein when water is added to the fuel flow, fuel injection pressure is constant claims.
  6. 6.根据权利要求1所述的大型二冲程柴油发动机(I),其中所述发动机(I)构造成在高载荷下以中等的排气再循环率运行,而不向所述燃料流加水。 6. A large two-stroke diesel engine according. 1 (I), wherein the engine (I) is configured to operate at moderate exhaust gas recirculation rate at high loads, without adding water to the fuel flow claims.
  7. 7.根据权利要求6所述的大型二冲程柴油发动机(1),其中通过所述排气再循环系统的质量流与发动机载荷无关地被保持为基本恒定。 The large two-stroke diesel engine (1) according to claim 6, wherein said exhaust gas recirculation system through mass flow regardless of the engine load is kept substantially constant.
  8. 8.根据权利要求7所述的大型二冲程柴油发动机(1),其中所述排气再循环系统设置有气涤器(16),并且所述气涤器(16)的尺寸被确定为对于通过所述排气再循环系统的所述基本恒定的质量流而言是足够的。 According to claim large two-stroke diesel engine (1) of claim 7, wherein said exhaust gas recirculation system is provided with a gas scrubber (16), and the size of the scrubber (16) is determined for by the exhaust gas recirculation system of the substantially constant mass flow terms are sufficient.
  9. 9.根据权利要求1所述的大型二冲程柴油发动机(1),其中所述燃料喷射系统包括燃料一水乳化系统。 According to claim large two-stroke diesel engine (1) of claim 1, wherein the fuel injection system includes a fuel-water emulsion systems.
  10. 10.根据权利要求1所述的大型二冲程柴油发动机(I),其中所述燃料喷射系统能够选择性地利用纯燃料运行,且能够选择性地利用水和燃料的混合物运行。 Claim 10. A large two-stroke diesel engine (I) of claim 1, wherein the fuel injection system can selectively use the pure fuel operation, and can selectively use a mixture of water and fuel operation.
  11. 11.根据权利要求1所述的大型二冲程柴油发动机(I),进一步包括控制所述燃料喷射系统的运行的电子控制单元,并且,所述电子控制单元构造成与所述排气再循环率相关地确定何时通过向所述燃料加水而增加通过所述喷嘴的质量流。 Claim 11. A large two-stroke diesel engine (I) of claim 1, further comprising an electronic control unit controls operation of the fuel injection system, and the electronic control unit is configured with the exhaust gas recirculation rate determining when related by adding water to the fuel nozzle is increased by the mass flow.
  12. 12.根据权利要求1所述的大型二冲程柴油发动机(1),进一步包括反馈控制系统(28,29),所述反馈控制系统(28,29)用于调节将被加到所述燃料流的水量和/或使用测得的排气中的NOx值调节所述排气再循环率。 12. A large two-stroke diesel engine according to claim (1), further comprising a feedback control system (28, 29), said feedback control system (28, 29) for regulating the flow of fuel to be added amount of water and / or using the measured values ​​of NOx in the exhaust gas of the exhaust gas recirculation rate is adjusted.
  13. 13.一种用于控制在十字头式大型涡轮增压二冲程柴油发动机(I)中的燃料喷射的方法,包括:在所述发动机(I)中以具有可变排气再循环率的排气再循环而运行,所述发动机设置有燃料喷射系统并且选择性地通过将水加至燃料而增加通过喷嘴的质量流以由此增加所喷射的液体的动量,当水流被加到燃料流时,燃料喷射流量是不变的。 13. A method for controlling the crosshead type large turbocharged two-stroke diesel engine (I) in a fuel injection, comprising: a variable exhaust gas recirculation rate in the engine exhaust (I), gas recirculation operation, the engine is provided with a fuel injection system and selectively passing the water to increase to thereby increase the fuel injected by the liquid mass flow nozzle momentum, when water is added to the fuel stream fuel injection flow rate is constant.
  14. 14.根据权利要求13所述的方法,其中水和燃料被乳化,以便将水加至所述燃料并且由此增加通过所述喷嘴的质量流。 14. The method according to claim 13, wherein the fuel and water are emulsified, so water was added to the fuel and thereby increase the mass flow through the nozzle.
  15. 15.根据权利要求13所述的方法,其中当超过给定的排气再循环率时,将水加到通过所述喷嘴的流动中。 15. The method according to claim 13, wherein when more than a given exhaust gas recirculation rate, water was added to the flow through the nozzle.
  16. 16.根据权利要求13所述的方法,其中通过排气再循环系统的质量流与发动机载荷无关地被保持为基本恒定。 16. The method of claim 13, wherein the exhaust gas recirculation system through mass flow regardless of the engine load is kept substantially constant.
  17. 17.根据权利要求13所述的方法,其中带有较大开口的喷嘴被用于当水被加到燃料流时的燃料喷射,而带有较小开口的喷嘴被用于当没有水被加到所述燃料流时的燃料喷射。 17. The method according to claim 13, wherein a nozzle with a larger opening is used for the fuel when the fuel flow is added when the water injection, the nozzle with a smaller opening is used when no water is added fuel injection into the fuel stream.
  18. 18.根据权利要求13所述的方法,其中与排气再循环率相关地确定被加到燃料流的水量。 18. The method according to claim 13, wherein associated with the exhaust gas recirculation rate is determined by the amount of water added to the fuel stream. ` `
CN 200980157911 2009-03-18 2009-03-18 Large Turbocharged Two-Stroke Diesel Engine With Exhaust- Or Combustion Gas Recirculation And Method For Reducing NOx And Soot Emissions CN102341589B (en)

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