中文摘要：

为了全面了解柴油／甲醇组合燃烧（DMCC）的尾气排放特性，对比研究了原柴油机、DMCC模式以及加装了催化转化器的DMCC模式的常规排放物NOx、THC和CO以及非常规排放物一甲醛尾气排放特性。结果表明：采用DMCC燃烧方式，可以减少NOx排放，并且随着甲醇替代比率的增加，NOx进一步减少；与原机相比，采用DMCC模式THC和CO排放明显增加，加装催化转化器后，有不同程度的降低，在高负荷时催化转化器的转化效率比较高，为85％-92％，催化后两者排放接近原机水平；甲醛排放比原机时增加几十倍，催化转化器可以降低甲醛排放，但也会增加甲醛排放，其效果与排气温度密切相关。在排气温度较高时，催化转化器对THC、CO、甲醛均有较好的转化效果。

英文摘要：

In order to get to know DMCC emission all around, comparisons of NOx , THC , CO and formaldehyde contained in emission under diesel engine , DMCC engine, DMCC engine with oxidation catalyst. Results show that comparison with diesel engine, DMCC engine can decrease NOz emission, with the methanol replace ratio increase, NOx decrease obviously, but THC and CO increase. When oxidation catalyst is used, THC and CO reduce, catalyst transition ratio is 85%-92% at high load. DMCC engine＇s formaldehyde in emission is more than that of diesel engine. Exhaust temperature affects catalyst＇s conversion on formaldehyde. Higher exhaust temperature is good to catalyst convert THC, CO and formaldehyde.