掺混重整气对汽油机燃烧及排放特性的影响

车载燃料重整制氢技术可以回收发动机尾气余热,在线制取重整气与汽油混合燃烧。基于一台1.6L四缸汽油机,在转速1800r/min,进气道绝对压力61.5kPa,理论当量比条件以及最大制动扭矩点火角条件下,考察混重整气对汽油机燃烧和排放性能的影响。试验结果表明：随着进气中重整气混合分数的逐渐增加,重整气中氢气的体积分数逐渐升高,燃油油耗率降低,指示热效率升高。尾气中HC、NOx和CO2的排放量降低,而CO的排放量则有所升高。

Effect of Syngas on Combustion and Emission Characteristic of Gasoline Engine

The onboard fuel reforming could not only recovery the exhaust heat but also produce syngas for the mixed combustion in cylinders. An experimental study was carried out on a four-cylinder 1.6L gasoline engine at a speed of 1800r/min, a manifolds absolute pressure of 61.5kPa and the maximum brake torque for the spark timing to explore the effect of syngas addition on the engine combustion and emission performances at the stoichiometric condition. The experimental results demonstrated that the hydrogen volume faction in syngas increased with the increase of syngas addition faction. The fuel consumption rate was decreased and the indicated thermal efficiency was improved. HC, NOx and CO2 emissions were reduced whereas CO emission was increased after the syngas enrichment at the stoichiometric condition.