DOC/DOC＋CDPF对重型柴油机气态物排放特性的影响研究  

Effects of DOC and DOC+CDPF on Gaseous Emissions from a Heavy-Duty Diesel Engine

作　　者：冯谦[1] 楼狄明[1] 计维斌[2,3] 谭丕强[1] 胡志远[1] 

机构地区：[1]同济大学汽车学院,上海201804 [2]上海汽车集团商用车技术中心,上海200438 [3]上海内燃机研究所,上海200438

出　　处：《内燃机工程》2014年第4期1-6,共6页Chinese Internal Combustion Engine Engineering

基　　金：上海市科学技术委员会科研计划项目(12dz1203102)

摘　　要：基于AVL-PEUS傅里叶变换红外光谱仪(FTIR)研究柴油机氧化型催化器(DOC)、柴油机氧化型催化器耦合催化型颗粒捕集器(DOC+CDPF)对重型柴油机一氧化碳(CO)、总碳氢化合物(THC)、一氧化氮(NO)、二氧化氮(NO_2)和二氧化硫(SO_2)气态物排放特性的影响。研究结果表明:相比单独的DOC,DOC+CDPF对CO具有更低的起燃温度,在催化剂活性位上THC比CO具有较强的吸附强度和活性位竞争优势,因此具有比CO更低的起燃温度;DOC和DOC+CDPF均能不同程度地减少NO、增加NO_2、减少总NO_x排放,减少NO的主要途径是氧化机理;在催化剂中添加氧化铈(CeO_2)能有效实现稀燃储硫、富燃释放硫的效果,增强催化剂的抗硫能力。Effects of DOC and DOC＋CDPF on gaseous emissions, such as CO, THC, NO, NO2, and SO2 from a heavy-duty diesel engine were studied based on AVL-PEUS FTIR equipment. Results show that： compared with DOC, DOC＋CDPF can decrease light-off temperature of CO. On the active sites, hydrocarbons show stronger adsorption and competition ability for active sites than CO, therefore, hydrocarbons oxidation can reach much lower light-off temperature. DOC and DOC--CDPF can reduce NO and NOx, but increase NO2 through oxidation mechanism. Catalyst added with CeO2 can restore sulfide at lean-burn and re- lease it at rich-burn conditions, which could enhance resistance of sulfur poisoning.

关 键 词：内燃机 柴油机氧化型催化器 柴油机氧化型催化器耦合催化型颗粒捕集器 一氧化氮/二氧化氮 二氧化硫 气态排放物 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]