甲醇对甲醇汽油混合燃料发动机碳氢排放贡献率的定量研究  

Contribution Ratio of Methanol to HC Emission of a Gasohol Fueled Spark Ignition Engine

作　　者：汪文瑞[1] 王坤[1] 王小荣[1] 魏衍举[1] 刘圣华[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2014年第3期39-43,114,共6页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51206130;51176151);国家"863计划"资助项目(2012AA111721);国家质检总局科技计划资助项目(2012IK039)

摘　　要：在一台JL368Q3型汽油机上,通过考察发动机燃用体积分数分别为10%、20%和85%的甲醇汽油混合燃料时甲醇和碳氢(HC)的排放特性,研究了甲醇和汽油各自的排放率随发动机排气温度的变化规律和甲醇掺混比的影响,以及甲醇对发动机碳氢排放的贡献率。试验结果表明:甲醇掺混比对甲醇排放率的影响不大,在各掺混比下,甲醇排放率均不超过8g/kg,且随发动机排气温度的升高呈现指数降低的趋势;汽油的碳氢排放率比甲醇排放率高一个数量级,甲醇体积分数为10%时发动机的碳氢排放率在中高负荷时最低,约为40g/kg;在各甲醇掺混比下,汽油均是发动机碳氢排放的主要来源,甲醇对发动机碳氢排放的贡献率不超过8%。The emission rate characteristics of methanol and hydrocarbon （HC） were investigated on a JL368Q3 gasoline engine when fueled with methanol/gasoline blends with the methanol fraction of 10%, 20% and 85% in volume, respectively. The effects of exhaust temperature and methanol fraction on the emission rates, and the contribution ratio of methanol on HC emission were then quantitatively studied. Experimental results show that the blending ratio of methanol has little effect on its emission rate, and the rate is less than 8 g/kg for all the fuel blends and it decreases exponentially with the increasing engine speed and exhaust temperature. The emission rate of HC is one grade higher than that of methanol and is higher than 40 g/kg when the engine fueled with the M10 blend. For all the tested fuel blends, gasoline is the main source of HC emission, and methanol contributes less than 8% on HC emission.

关 键 词：甲醇 汽油机 排放率 甲醇汽油混合燃料 

分 类 号：TK462[动力工程及工程热物理—动力机械及工程]