天然气组分变化对内燃机燃烧及排放特性的影响

Influence of natural gas fuel composition variation on combustion and emission characteristics in an internal combustion engine

根据我国天然气组分变化的情况 ,研究了天然气组分变化时 ,燃料的低热值、理论空燃比和燃烧热的变化 ,由计算、试验结果讨论了在过量空气系数为 1时火焰绝热温度、CO2 、CO和 NOX排放特性随H/ C比的变化 ,并分析了天然气中的乙烷、丙烷、丁烷、N2 、CO2 和 H2 含量的变化对华白数和燃烧势的影响 .同时将分析的结果与我国的汽车用压缩天然气标准中的技术要求进行了对比 。

The variations of lower heating value, theoretical air-fuel ratio and combustion potential of natural gas fuel were investigated according to the variation of natural gas composition China. The variations of adiabatic flame temperature and exhaust characteristics at different H/C ratio when the excess air coefficient is 1 are discnssed in this paper on the basis of by using calculation and emirieal results. The influences of the content of ethane, propane, butane, CO\-2, N\-2, and H\-2 on the Wobbe index and combustion potential were analyzed. The analysis result and the standard for compressed natural gas for vehicle in China were compared, Some interesting phenomena were observed.