EGR对电喷LPG发动机燃烧过程及NO_x排放的影响  

Effects of EGR on Burning Process and NOx Emission of Electronic Controlled LPG Injection SI Engine

作　　者：胡春明[1] 刘娜[1] 李伟[1] 宋玺娟[1] 

机构地区：[1]天津大学天津内燃机研究所,天津300072

出　　处：《农业机械学报》2009年第8期18-22,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：天津市应用基础研究重点项目(06YFJZJC01500);天津市科技支撑计划重点项目(08ZCKFGX02700)

摘　　要：研究了EGR率的变化对LPG燃气在稀燃条件下的燃烧、排放以及循环变动率的影响。结果表明,基于高能双火花塞点火的快速燃烧系统可以加快LPG燃气的燃烧速率,有效地改善引入EGR的LPG发动机的快速燃烧过程。在整个有效废气再循环率(REGR)范围内LPG稀燃稀限得到较大幅度提高,同时抑制了发动机因高温而生成的NOx。同时,采用快速燃烧系统的最大REGR为8.11%,大于普通方式的5%;LPG燃烧过程的循环变动也得到有效控制。This study was focused on the impact of the changes of the EGR rate on combustion, emissions and the coefficient of variation of LPG engine at lean burn conditions. Test data showed that dual- spark plug-based rapid burning system increased the combustion heat release of LPG mixture, and. improved the rapid burning process of LPG engine with EGR. Meanwhile, the excess air ratio limits of LPG lean-burning was largely extended within the total effective range of EGR rate（REOR）. At the equivalent running conditions of LPG engine, largely extended REGR restrained the formation of NOx emission by high combustion temperature. The highest REGR of rapid combustion process was increased from 5% to 8.11% of normal combustion process. Additionally, the coefficient of variation of LPG combustion process got control effectively.

关 键 词：废气再循环 电喷LPG发动机 快速燃烧过程 双火花塞 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]