中文摘要：

对一台国IV重型柴油机装用不同厂家生产的3种典型商用尿素-SCR催化转化器在台架上进行了动力性、经济性和排放等性能匹配试验,重点研究催化转化器的压降特性、起燃特性、动态响应和转化效率等性能。结果表明,催化器目数越少,其压降越小;起燃温度低,动态响应快的催化器具有较好的NOx控制效果,且在减少NH3、SO2、N2O和NO2排放方面效果也较好。SCR尺寸和结构相同时,发动机动力性和经济性基本不受催化剂配方和涂层工艺的影响。

英文摘要：

A power,fuel economy and emission performances matching test is conducted on a stage-IV heavy duty diesel engine equipped with 3 typical commercial urea-SCR catalytic converters produced by different manufacturers,focusing on the study on performances including pressure drop and light-off characteristics as well as the dynamic response and pollutant conversion rates of catalytic converter.The results show that the fewer the mesh number of converter,the smaller its pressure drop;the catalytic converter with lower light-off temperature and quicker dynamic response has better control result for not only NOx,but also NH3,SO2,N2O and NO2.With same size and structure of SCR,the formula and coating process of catalyst basically have no effects on the power and fuel economy of engine.