含水乙醇汽油对发动机NO_x排放的影响  

Effects of Hydrous Ethanol Gasoline on Engine NO_x Emission

作　　者：叶燕帅[1] 凌华梅 牛彩云 谭艳 李春青[1] YE Yanshuai;LING Huamei;NIU Caiyun;TAN Yan;LI Chunqing(Institute of Automobile,Guangxi University of Science and Technology,Liuzhou　545006,China;Guangxi Electromechanical Technician College,Liuzhou　545006,China)

机构地区：[1]广西科技大学汽车与交通学院,广西柳州545006 [2]广西机电技师学院,广西柳州545006

出　　处：《车用发动机》2018年第2期64-67,73,共5页Vehicle Engine

基　　金：广西高校中青年教师基础能力提升项目(2017KY0349);广西科技大学自然科学基金项目(校科自1419211)

摘　　要：通过发动机台架试验,研究了燃用不同掺比的含水乙醇汽油对发动机NO_x排放及三元催化剂催化转化效率的影响。试验结果表明:发动机燃用含水乙醇汽油后怠速工况下催化器前NO_x排放下降,相比汽油E10,E20,E30的NO_x排放量分别降低64%,68%,69.5%;随着含水乙醇掺比的增加,NO_x的催化转化率降低,E10,E20,E30的NO_x催化转化率分别降低19%,24%,34%。含水乙醇汽油在低负荷时催化器前NO_x排放低于93号汽油,负荷加大后,燃用含水乙醇汽油的NO_x排放高于燃用汽油,NO_x排放由大到小依次为E20,E30,E10,93号汽油;E20的NO_x排放在中高负荷比93号汽油上升6%。在中高负荷工况,燃用含水乙醇汽油时催化器后的NO_x排放量要高于93号汽油,大负荷工况下,E10,E20,E30催化器后的NO_x排放量分别比93号汽油高15%,6%,29%;NO_x催化转化效率随着含水乙醇掺比的增大而降低,大负荷工况下E30的催化转化率约为93号汽油的92%。The effects of gasoline mixed with different proportions of hydrous ethanol on NO x emission and catalytic conversion efficiency of three-way catalyst were studied by engine bench test.The experimental results show that NO x emission of E10,E20,and E30 before the catalytic converter in idle condition decreases by 64%,68%and 69.5%respectively after being fueled with hydrous ethanol gasoline.With the increase of hydrous ethanol proportion,the catalytic conversion efficiency of NO x decreases.The catalytic conversion efficiency of E10,E20,and E30 decreases by 19%,24%and 34%respectively.The NO x emission of hydrous ethanol gasoline before the catalytic converter is lower than that of 93#gasoline at low load and becomes higher after increasing the load.NO x emission of E20,E30,E10 and 93#gasoline decreases in turn.The NO x emission of E20 increases by 6%in medium and high load compared with 93#gasoline.The NO x emissions after the catalytic converter are higher than that of 93#gasoline in medium and high load and those of E10,E20 and E30 are 15%,6%and 29%higher than 93#gasoline respectively in high load.The catalytic conversion efficiency of NO x decreases with the increase of hydrous ethanol ratio and that of E30 is around 92%of 93#gasoline under high load conditions.

关 键 词：汽油机 含水乙醇汽油 氮氢化物 催化转化效率 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]