低温等离子体降低柴油机微粒和NO_x排放试验研究  

Experimental study on reduction of particle and nitrogen oxide emissions of diesel engine by non-thermal plasma

作　　者：徐辉[1] 蔡忆昔[1] 李小华[1] 施蕴曦[1] 李伟俊[1] XU Hui CAI Yi-xi LI Xiao-hua SHI Yun-xi LI Wei-jun(School of Automotive and Traffic Engineering , Jiangsu University , Zhenjiang 212013, China)

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《浙江大学学报（工学版）》2016年第12期2418-2423,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51176067);江苏省高校优势学科建设资助项目(PDPA);江苏省"六大人才高峰"资助项目(2013-ZBZZ-036)

摘　　要：为降低柴油机微粒（PM）和NO_x排放,基于介质阻挡放电原理设计低温等离子体（NTP）发生器;利用NTP,对加装柴油机微粒捕集器的柴油机进行试验研究.结果表明：该工况下,柴油机微粒排放的粒径分布呈单峰分布,93%的微粒是超细微粒;柴油机微粒捕集器（DPF）对微粒数量的捕集效率约为93.8%;NTP活性气体通入后,与未通入NTP的DPF下游微粒的数量密度相比,DPF下游微粒排放的数量密度减小了68%,粒径尺寸在25.5-124.1nm减小幅度相对较大,约为80%,微粒的几何平均直径也有所减小;DPF和NTP活性气体双重作用可在降低微粒排放的同时降低NO_x排放;微粒数量密度减小98%,NO_x转化效率约为57%.The non-thermal plasma（NTP）reactor was designed to decrease diesel engine emission based on dielectric barrier discharge.The experiment was carried out to dispose the harmful emissions of diesel engine with diesel particular（DPF）by NTP.Results show that the particle number size distribution of diesel engine is single peak distribution under the operation condition,of which 93% of particulate matter（PM）are micro-particles.The trapping efficiency of DPF is 93.8%for particle number.After the active NTP gases being pumped in,the particle number concentration of the DPF downstream is cut down by68%,comparing to that of the DPF downstream without NTP;the average geometry of PM is decreased.Morever,the particulate matter of size distribution between 25.4and 124.1nm is cut down by 80%obviously.With the function of DPF and NTP,PM emission and NO_xemission can be cut down at the same time.The decreasing range of particle number concentration and NO_xconversion rate are 98% and57%,respectively.

关 键 词：柴油机 低温等离子体(NTP) 微粒(PM) 氮氧化物(NOx) 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]