小型发动机燃用汽油、乙醇和LPG燃料的排放对比

Exhaust Emissions from a Small Engine Using Gasoline, Ethanol and LPG

对125mL发动机燃用汽油、乙醇和液化石油气(LPG)时的过量空气系数和点火提前角与排放性能之间的关系进行了试验研究.指出了影响这三种燃料发动机排放性能的敏感参数的合理取值范围.通过对比试验,验证了发动机燃烧乙醇可降低NOx排放浓度.发动机燃烧LPG时,低HC排放的空燃比范围比其它两种发动机空燃比范围广.研究结果可为小型汽油、乙醇和LPG发动机参数匹配提供参考.

Effects of excess air ratio Φa and ignition timing θ on CO,HC and NOx emissions from a 125 mL engine fueled with gasoline, ethanol and liquefied petroleum gas(LPG)were studied experimentally. It is proved that ethanol engine emits less NOx than equivalent gasoline and LPG engine, LPG engine emits less HC than equivalent gasoline and ethanol engine. Relatively optimal ranges of Φa and θ to lower emissions from gasoline, ethanol and LPG engines were proposed which is useful to their parameter matching and control.