柴油机DOC+CDPF系统的过滤和再生性能试验研究  

Experimental Study on Filtration and Regeneration Performance of DOC+CDPF System for Diesel Engine

作　　者：张靖[1] 孟忠伟[1] 刘苗[1] 陈秋宇[1] 张川[1] 

机构地区：[1]西华大学汽车与交通学院汽车测控与安全四川省重点实验室四川汽车关键零部件协同创新中心,四川成都610039

出　　处：《车用发动机》2016年第4期62-65,共4页Vehicle Engine

基　　金：国家自然科学基金资助项目(51106130);教育部"春晖计划"合作科研项目(Z2014058);发动机燃料电控系统及尾气后处理系统产业集群项目(成财教[2013]265);四川省教育厅青年基金项目(12ZB138);西华大学重点科研基金项目(Z1120319);西华大学研究生创新基金项目(ycjj2015040);四川省重点科技项目(2011JYZ014)

摘　　要：基于氧化催化转化器(DOC)+催化型颗粒捕集器(CDPF)系统开展了发动机台架试验,对比系统前后的颗粒物粒径分布,获得了系统的过滤效率,同时也测量了该系统在各稳态工况下的再生效率。研究结果表明:该系统对颗粒物的过滤效率在发动机的各个工况均能达到95%以上;系统前的颗粒物数量浓度呈单峰分布,主要为核模态;系统后颗粒物数量浓度呈双峰分布,峰值分别在10nm和150nm左右,且10nm左右波峰峰值最大;再生效率随着再生温度的升高呈上升趋势,测试系统的起燃温度在250℃以下;再生效率均随着再生时间的增加而增加,但在再生后期明显变缓;在较高的再生温度时,颗粒担载量增大将有利于提高再生速率。The particle size distribution before and after the diesel oxidation converter （DOC） and catalyzed diesel particle fil-ter （CDPF ） system were measured and compared to obtain the filtration efficiency of particle on a test bench, and the system regeneration efficiency was also measured under the steady conditions of different loads. The results show that the filtration ef-ficiency of particle is beyond 95% at each condition. The particle number concentration distribution before DOC＋CDPF system shows a single peak distribution with the nuclear particle mode and that after DOC＋CDPF system showed a double peak distri-bution at the size of 10 nm with a large value and 150 nm. The regeneration efficiency increases with the increase of regenera-tion temperature and regeneration time, the ignition temperature of test system is below 250 C and the regeneration becomes slow during the late phase. At a high regeneration temperature, the increase of soot loading will promote the regeneration rate.

关 键 词：柴油机 颗粒捕集器 过滤性能 粒径分布 再生效率 再生速率 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]