不同气氛下微粒捕集器的离线再生  

DPF offline regeneration under different atmospheres

作　　者：徐辉[1] 蔡忆昔[1] 施蕴曦[1] 丁道伟[1] XU Hui CAI Yixi SHI Yunxi DING Daowei(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,镇江212013

出　　处：《环境工程学报》2017年第2期1015-1021,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金重点项目(51176067);江苏省高校优势学科建设资助项目(PDPA)

摘　　要：基于NO_2、NO_2/O_2以及O_3与PM的化学反应模型,探究了气氛对微粒捕集器(DPF)离线再生效果的影响。研究结果表明,NO_2/N_2的气氛下,PM的起燃温度为250℃,而在NO_2/O_2/N_2气氛下,PM的起燃温度降至150℃左右,但在O_3/N_2气氛下,PM可在低于100℃的再生温度下起燃。在3种气氛下,DPF的再生效率受再生温度的影响均较为明显。当再生温度较低(≤250℃)时,O_3/N_2气氛下,DPF的再生效果最好,且实现完全再生的时间最短;当再生温度较高(>250℃)时,NO_2/O_2/N_2气氛下,DPF再生效果最好,且温度越高,实现完全再生的时间越短。在所选的再生温度范围内,O_3/N_2气氛下的壁面最大温度梯度峰值均高于NO_2/N_2和NO_2/O_2/N_2气氛,但远小于DPF安全的温度梯度极限。Effects of atmosphere on diesel particulate filter（ DPF） offline regeneration were studied based on the chemical reaction models of NO_2,NO_2/ O_2,O_3,and PM. The results show that the light-off temperature of PM under a NO_2/ N_2 atmosphere is about 250 ℃,and it drops to about 150 ℃ under a NO_2/ O_2/ N_2 atmosphere. The light-off temperature of PM under an O_3/ N_2 atmosphere is lower than 100 ℃. The regeneration temperature has a significant impact on the efficiency of DPF regeneration under the three atmospheres. When the regeneration temperature is lower（ ≤250 ℃）,the effect of DPF regeneration is best under an O_3/ N_2 atmosphere and the time for complete regeneration is the shortest. However,when the regeneration temperature is higher（ 250 ℃）,the effect of DPF regeneration is best under a NO_2/ O_2/ N_2 atmosphere and the time for complete regeneration decreases with the increase in temperature. With the regeneration temperatures selected in this study,the peak of the maximum gradient of the solid temperature under an O_3/ N_2 atmosphere is larger than that under a NO_2/ N_2 or NO_2/ O_2/ N_2 atmosphere,which is much less than the safe gradient temperature.

关 键 词：气氛 柴油机 微粒 微粒捕集器 离线再生 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]