DOC与SCR系统在轻型柴油机中的应用研究

发布时间：2018-03-12 17:18

  本文选题：柴油机　切入点：排放　出处：《广西大学学报(自然科学版)》2016年05期 　论文类型：期刊论文

【摘要】：针对单独的选择性催化还原器(SCR)不能使轻型柴油机排放达到标准,提出氧化催化转化器(DOC)与SCR组合应用。基于台架试验,在一台四缸共轨增压中冷柴油机的排气管上匹配DOC和SCR并进行欧洲稳态循环(ESC)测试研究,探究了DOC对SCR入口处进气的温度影响和对SCR中结晶物进行热重分析,研究了DOC+SCR对柴油机的经济性的影响、尾气排放性能的影响。试验结果表明:DOC对提高SCR入口温度的作用不大,在转速2 400 r/min,扭矩126 N·m时达到最大10℃;DOC主要改变SCR入口NO2与NOx的体积比,怠速状态下提高比例达到64%,其余工况达到30%;对尿素沉积物进行了分析,得出排气管壁与喷嘴处附近的结晶组分含量不相同;柴油机采用DOC与SCR后处理装置后,燃油消耗率在高负荷情况下增大1.5%;CO和HC排放在各个负荷下都大幅下降,排放值分别为0.007 g/(k W·h)、0.005 g/(k W·h);NOx的排放在SCR作用下达到1.209 g/(k W·h),转化率达到79%。研究结果可为轻型柴油机满足排放标准、优化排放提供参考。
[Abstract]:In view of the fact that the single selective catalytic reducer (SCR) can not meet the emission standard of light duty diesel engine, the combined application of oxidation catalytic converter (SCR) and SCR is put forward. DOC and SCR were matched on the exhaust pipe of a four-cylinder common-rail turbocharged intercooled diesel engine, and the European steady-state cycle test was carried out. The influence of DOC on the inlet temperature of SCR and the thermogravimetric analysis of the crystal in SCR were investigated. The effects of DOC SCR on diesel engine economy and exhaust emission performance are studied. The experimental results show that DOC SCR has little effect on increasing the inlet temperature of SCR. At the rotational speed of 2 400 r / min, the maximum 10 鈩，

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