采用EGR结合高压喷射技术实现柴油机低排放的实验研究

发布时间：2018-01-07 07:30

本文关键词：采用EGR结合高压喷射技术实现柴油机低排放的实验研究　出处：《天津大学》2016年硕士论文　论文类型：学位论文

【摘要】：日益严格的排放法规给柴油机技术不断提出新的挑战。我国的发动机企业前期将采用SCR作为中、重型柴油机满足国IV排放的首选路线。随着对各技术路线认识的深入,采用EGR+DPF的排放控制技术逐渐受到重视。但是SCR,DPF等高效的后处理装置存在价格昂贵、结构复杂、寿命短、维护困难等问题,因此需要通过机内净化尽量降低柴油机原始排放来减轻对后处理的依赖。在这种形势下,本文针对WP7柴油机的无后处理排放问题,采用结合EGR和高压喷射技术,对WP7发动机的结构进行优化和选型,同时基于实验,对发动机的工作状态进行标定和优化,探索无后处理达到国四技术路线可行性。本课题针对WP7.300E408柴油机进行了结构的优化,对于发动机的喷油器、燃烧室、气缸盖、EGR冷却器、增压器等部件进行了选型,选择ESC排放循环中的A100、B100、C100、B50、C50五个点进行DOE选型,根据各个部件的排放表现确定最终实验部件。根据排放要求,确定各个标定参数范围后进行DOE设计,并进行台架自动标定,可以大大减少部件选型实验实验工作量,加快实验进程。进行了ESC、ELR、ETC排放标定,由于本项目是无后处理国四,为了满足排放要求,轨压标定的都较高,主喷提前角在排放区都很小基本在5 deg以下。同时后喷只在排放区域开启,在非排放区不使用后喷。对发动机的性能及排放结果进行外特性、万有特性及排放实验,对发动机的性能及排放进行验证。实验结果显示,无后处理路线可以达到国四排放要求并有一定的余量。通过实验研究发现发动机的性能参数除了油耗率高于SCR版设计要求外,其余参数均满足设计要求,但是综合考虑油耗与尿素消耗,油耗率差值会进一步减小。根据性能及排放结果显示,不使用后处理情况下,WP7.300E408柴油机排放能够满足国四排放限值要求,达到了本课题研究目的。
[Abstract]:The increasingly stringent emission regulations have brought new challenges to diesel engine technology. SCR will be adopted in the early stage of engine enterprises in China. Heavy duty diesel engine meets the preferred route of national IV emission. With the in-depth understanding of each technical route, the emission control technology using EGR DPF has been paid more and more attention. But SCR. DPF and other efficient post-processing devices have some problems, such as high cost, complex structure, short life, difficult maintenance and so on. Therefore, it is necessary to reduce the dependence on post-processing through internal purification to reduce the original emissions of diesel engine. In this situation, this paper aims at the problem of after-treatment emissions of WP7 diesel engine. The structure of WP7 engine is optimized and selected by combining EGR and high pressure injection technology. At the same time, the working state of the engine is calibrated and optimized based on the experiment. In this paper, the structure of WP7.300E408 diesel engine is optimized for the injector, combustor and cylinder head of the engine. The EGR cooler, supercharger and other components were selected, and the five points of A100B100B100C100B50B50C50 in the ESC emission cycle were selected for DOE selection. According to the emission performance of each component, the final experimental components are determined. According to the emission requirements, the range of calibration parameters is determined and the DOE design is carried out, and the bench is calibrated automatically. It can greatly reduce the experimental workload and speed up the experiment process. The ESCR ERC etc emission calibration is carried out, because this project is a post-processing country, in order to meet the emission requirements. The calibration of rail pressure is high, the main jet advance angle is very small in the discharge area and is below 5 deg, and the rear jet is only opened in the discharge area. The performance and emission results of the engine are tested and tested. The performance and emission of the engine are verified. Through the experimental study, it is found that the performance parameters of the engine meet the design requirements except for the fuel consumption rate higher than the design requirements of the SCR version. However, considering the oil consumption and urea consumption, the difference of oil consumption rate will be further reduced. According to the performance and emission results, no use of the post-treatment situation. WP7.300E408 diesel engine emissions can meet the national four emission limit requirements, and achieve the purpose of this study.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U464.172

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