乙醇汽油发动机非常规排放及其催化转化的研究

利用气相色谱-氦离子化快速检测方法,研究了一台多点电喷汽油机分别燃用乙醇汽油混合燃料(乙醇的体积分数分别为0%、10%、20%和85%,记为E0、E10、E20和E85)时的非常规醇醛排放特性及其催化转化特性.研究结果表明:与汽油机相比,E10和E20混合燃料发动机的甲醛、乙醛和乙醇排放随乙醇掺混比的增加而增加,而E85混合燃料发动机的甲醛、乙醛排放增幅略小,约为E0发动机的1.6倍和2.4倍,乙醇排放却大幅增加,约为E10混合燃料发动机的35倍;随负荷的增加,乙醛排放整体呈增加的趋势,E10和E20混合燃料发动机的乙醇排放降低,而E85混合燃料发动机的乙醇排放却增加;普通的三效催化器对乙醛、乙醇排放的转化效率均在75%以上,但对甲醛的转化效果不佳,对E20和E85混合燃料发动机甲醛排放的转化效率低于30%.

Unregulated Emissions and Their Three-Way Catalytic Conversion of a Spark Ignition Engine Fueled with Ethanol-Gasoline

Four typical ethanol-gasoline blends,E0,E10,E20 and E85,containing 0%,10%,20% and 85% of ethanol in volume respectively were prepared to investigate the effects of ethanol/gasoline blends(gasohol) on engine unregulated emissions.A multiple-point injection gasoline engine was applied in the experiment and the unregulated emissions were detected by a gas chromatography with a pulsed discharge helium ionization detector.The performance of a three-way catalytic converter(TWC) was examined.The experimental resul...