DPF缸内次后喷再生效率和排放的试验研究  

Experimental study on efficiency and emissions of DPF regeneration using in-cylinder late post injection

作　　者：程晓章 查小辉 陈康 韦伟 CHENG Xiaozhang;ZHA Xiaohui;CHEN Kang;WEI Wei(School of Automobile and Traffic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学汽车与交通工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2018年第9期1153-1157,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家高技术研究发展计划(863计划)资助项目(2013AA065304)

摘　　要：文章针对柴油机微粒捕集器(diesel particulate filter,DPF)的再生展开相应的研究。利用降怠速再生试验(drop-to-idle,DTI)确定载体碳载量限值,利用台架试验研究了缸内次后喷(late post injection,LPI)基于不同再生温度与再生时间对再生效率和排放性能的影响。结果表明:3.0g/L的碳载量水平满足DTI的试验要求且适宜再生试验研究,可以避免在再生突然中断后DPF内部温度迅速升高,避免载体烧融;再生时间维持在2min左右,再生时DPF出口温度维持在500℃左右时,DPF再生效率高达98%,装载碳烟几乎完全燃烧,且DPF内部温度和出口温度可控,保证了DPF安全可靠再生,同时增加了DPF使用寿命;对整个再生过程中尾气成分进行分析和计算,发现柴油机尾气中HC为主要二次污染物,且排放相对较大。The diesel particulate filter(DPF)regeneration system was evaluated,which applied drop-to-idle(DTI)regeneration test to determining the limits of soot load and in-cylinder late post injection(LPI)to studying the influence of different regeneration temperature and time on the regeneration efficiency and emissions by the bench test.The results show that the soot loading level of 3.0 g/L meets the test requirements and suits to the regeneration experimental research.Besides,the rapid increase of DPF internal temperature after the sudden interruption of regeneration and carrier sintering can be avoided.When the regeneration time maintains at about 2 min,DPF outlet temperature maintains at about 500℃,DPF regeneration efficiency reaches 98%,soot load is almost completely burned.Both the internal temperature and the outlet temperature of the DPF are controlled to ensure the safety and reliability of the DPF regeneration and increase the life of the DPF.The analysis and calculation of exhaust components show that HC in diesel exhaust is the main secondary pollutant and its emission is relatively large during the entire process of regeneration.

关 键 词：微粒捕集器(DPF) 缸内次后喷(LPI) 再生效率 排放 碳载量 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]