非道路柴油机氧化亚氮排放特性试验研究
白凤月1,王振宇1,申富强2,张佑源2*,吴春玲1,张琳1,景晓军1
1.中汽研汽车检验中心(天津)有限公司,天津 300300;
2.东风柳州汽车有限公司,广西 柳州 545500
摘要:基于非道路稳态和瞬态循环,对装配铜基选择性催化还原系统的某柴油机氧化亚氮N2O排放特性进行试验研究。结果表明:稳态循环和冷、热起动瞬态循环下,N2O比排放均较高,比排放分别为147.1、130.2、150.2 mg/(kW·h);稳态循环中,发动机负荷降低,N2O排放增加;瞬态循环中,N2O与原机NOx排放特性相同;冷起动时的N2O排放主要来自NH3的氧化,主动再生可以大幅降低N2O排放。
关键词:非道路柴油机;N2O;选择性催化还原;铜基催化剂
Experimental study on N2O emission characteristics of nonroad diesel engine
BAI Fengyue1, WANG Zhenyu1, SHEN Fuqiang2, ZHANG Youyuan2*,
WU Chunling1, ZHANG Lin1, JING Xiaojun1
1.CATARC Automotive Test Center (Tianjin) Co., Ltd., Tianjin 300300, China;
2.Dongfeng Liuzhou Motor Co., Ltd., Liuzhou 545000, China
Abstract:Based on the non-road steady cycle and the non-road transient cycle, N2O emissions of the diesel engine equipped with copper based selective catalytic reduction system are studied. The results show that N2O emissions are relatively high under steady-state cycle, cold start transient cycle and hot start transient cycle, with specific emissions of 147.1, 130.2 and 150.2 mg/(kW·h) respectively. In the steady-state cycle, the N2O emissions increase when engine load decreases. In the transient cycle,N2O emissions have the same trend as the NOx emissions of the original engine. N2O emissions during the cold start mainly result from the oxidation of NH3. Active regeneration of DPF greatly reduces N2O emissions.
Keywords:non-road diesel engine; N2O; selective catalytic reduction; copper based catalyst