摘要
为研究DOC+CDPF+SCR对轻型柴油机动力性、经济性、排放性的影响,以一台满足国五排放法规的轻型柴油机作为样机,加装DOC+CDPF+SCR后处理系统后进行了台架试验研究。结果表明:加装DOC+CDPF+SCR后处理系统对柴油机的动力性和经济性有一定影响,外特性下扭矩平均降幅为1.3%,负荷特性下燃油消耗率平均升幅为2.6%。DOC+CDPF+SCR能有效降低柴油机的NO_x,THC,CO以及颗粒物排放。DOC主导净化THC和CO,对颗粒物也有良好的减排能力;SCR主导净化NO_x,排气温度较低时转化效率不高;CDPF主导净化颗粒物排放,对中小粒径颗粒物的净化效率更高。PN和PM平均减排率分别为99.1%和96.6%。
In order to study the influences of DOC,CDPF and SCR combination on power performance,fuel economy and emission performance of light-duty diesel engine,the bench test was conducted on a ChinaⅤlight-duty diesel engine with the after treatment system.The results showed that the addition of DOC,CDPF and SCR after treatment system had some effects on power performance and fuel economy of diesel engine,which were an average torque drop of 1.3% and an average fuel consumption rate increase of 2.6%.In addition,the after treatment system consisting of DOC,CDPF and SCR could reduce the NOx,THC,CO and PM emissions effectively.DOC could promote not only the purification of THC and CO,but also the reduction of PM.SCR mainly helped the purification of NOx,but the conversion efficiency was low at low exhaust gas temperature.CDPF was responsible for the purification of PM emissions and had a higher purification efficiency for PM with the medium and small particle diameter.The average reduction rates of PN and PM were 99.1% and 96.6% respectively.
作者
楼狄明
谭畅
谭丕强
胡志远
LOU Diming;TAN Chang;TAN Piqiang;HU Zhiyuan(Tongji University,Shanghai201804,China)
出处
《车用发动机》
北大核心
2019年第2期16-21,27,共7页
Vehicle Engine
基金
混合动力专用柴油机关键技术研究(2017YFB0103501)
关键词
柴油机
氧化催化器
催化颗粒捕集器
选择性催化还原
排放
diesel engine
diesel oxidation catalyst(DOC)
catalytic diesel particulate filter(CDPF)
selective catalytic reduction(SCR)
emission
