柴油机排气中可溶性有机物排放的特性  

Emission Characteristics of Soluble Organic Fraction During Exhaust Transportation of a Diesel Engine

作　　者：王春杰 郝利君[1] 张传桢 颜欣迪 吕立群 王亚超[1] Wang Chunjie;Hao Lijun;Zhang Chuanzhen;Yan Xindi;Lyu Liqun;Wang Yachao(National Laboratory of Automotive Performance&Emission Test,Beijing Institute of Technology,Beijing 100081,China;Research and Design Center,BAIC Motor Corporation Limited,Beijing 101300,China)

机构地区：[1]北京理工大学汽车动力性及排放测试国家专业实验室,北京100081 [2]北京汽车股份有限公司试验部,北京101300

出　　处：《内燃机学报》2020年第3期241-248,共8页Transactions of Csice

基　　金：国家重点研发计划资助项目(2017YFF0211802);国家自然科学基金资助项目(51576016,51676017).

摘　　要：通过柴油机台架试验,在一款柴油机上加装氧化型催化转化器(DOC)装置,研究了DOC前/后排气颗粒物中可溶性有机物(SOF)和固相多环芳烃(PAHs)的变化趋势,分析了不同转速和负荷对SOF及PAHs排放的影响以及排气中SOF及PAHs排放在排气过程中的变化规律.结果表明:DOC能明显降低排气中SOF及PAHs排放,SOF最高减排为50.69%,PAHs最高减排为83.28%,同时PAHs的毒性当量最高降低为49.31%.随着柴油机转速增加,燃烧过程后燃增加,排气中SOF及PAHs有增加的趋势,而随负荷的增加,缸内燃烧温度升高,各成分氧化速率加快使得SOF及PAHs排量逐渐降低.随排气输运距离增加,排气组分冷凝现象加重致使SOF及PAHs排量明显升高.Based on the diesel engine bench test,the variation of the soluble organic fraction(SOF)and polycyclic aromatic hydrocarbons(PAHs)in the exhaust particles were studied before and after the installation of the diesel oxidation catalyst(DOC).The effects of different speeds and loads on the emissions of SOF and PAHs and the variation of SOF and PAHs emissions in the exhaust process were analyzed.The results show that,after DOC installation,the emissions of SOF and PAHs in the exhaust gas can be significantly reduced.The maximum reduction of SOF emissions is 50.69%,the PAHs emission reduction is 83.28%,and the PAHs toxicity equivalent is reduced by 49.31%.As the engine speed increases,the post-burning combustion increases,and the SOF and PAHs emissions in the exhaust gas tend to increase.Meanwhile,with the increase of engine load,the combustion temperature in the cylinder increases and the oxidation rate of each component accelerates,resulting in a gradual reduction of the SOF and PAHs emissions.As the transport distance of the exhaust gas increases,the condensation of the exhaust components is aggravated,resulting in a significant increase in the emissions of SOF and PAHs.

关 键 词：柴油机 可溶性有机物(SOF) 多环芳烃(PAHs) 氧化型催化转化器(DOC) 

分 类 号：TK427[动力工程及工程热物理—动力机械及工程]