废气再循环与过量空气系数联合的NO_x控制策略在天然气发动机上的应用  

Application of EGR and excess air ratio combined NOx emission control strategy on natural gas engine

作　　者：杨立平 马修真[1] 李君[2] 王立媛 

机构地区：[1]哈尔滨工程大学动力与能源工程学院,哈尔滨150001 [2]吉林大学汽车工程学院,长春130022 [3]哈尔滨工程大学理学院,哈尔滨150001

出　　处：《吉林大学学报（工学版）》2010年第4期942-946,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：'973'国家重点基础研究发展规划项目(2006AA11A1B1);中国博士后科学基金项目(20100471021)

摘　　要：在一台改造的增压中冷天然气发动机上研究了废气再循环(EGR)和过量空气系数(a)对天然气发动机性能的影响。结果表明稀混合气加EGR的方法在达到相同NOx排放控制目标值时能够产生比采用纯空气稀释时更高的热效率。因而提出了EGR和a联合的NOx排放控制策略。试验确定了2800r/min、75%和50%负荷下由EGR和a表示的NOx排放控制区,该区域内在没有催化后处理器的条件下可以将NOx降低到1g/(kW·h)以下,同时可以兼顾发动机燃料经济性。The effects of exhaust gas recirculation（ EGR） and excess air ratio（ a） on engine performance were investigated experimentally on a modified turbocharged and intercooled spark-ignition natural gas engine. The results show that the lean mixture combustion combined with EGR resulted in higher thermal efficiency than that only using lean combustion strategy at the same NOx emission target. Therefore,an EGR and a combined NOx emission control strategy was proposed. The NOx emission control domains at engine speed 2800 min/r,75% and 50% loads were deterrnied in which the NOx emission kept below 1 g·（ kW·h）-1 without need for exhaust gas after treatment and serious penalty on fuel economy.

关 键 词：动力机械工程 天然气发动机 废气再循环 稀燃 排放 

分 类 号：TK46[动力工程及工程热物理—动力机械及工程]