摘要
柴油机颗粒捕集器(diesel particulate filter,DPF)是降低柴油机颗粒物排放的有效手段。喷油助燃是重型柴油机采用最多的一种DPF主动再生方法,由于DPF主动再生试验实施非常困难,很少直接对真实柴油机DPF的主动再生过程进行试验研究。文中对柴油机稳态工况下催化型柴油机颗粒捕集器(catalyzed diesel particulate filter,CDPF)喷油助燃主动再生过程进行试验研究,对CDPF主动再生过程中的压降、温度以及排放进行了分析。研究表明:CDPF主动再生时,其内部局部地区的温度远远高于CDPF的进口温度和出口温度,CDPF内部温度分布总体呈现出轴向上越靠近CDPF后端温度越高,径向上中间温度最高,中心温度次之,边缘温度最低的规律。CDPF主动再生时会有少量的碳氢和CO泄漏,CDPF后的NO_2浓度会显著降低,颗粒物数量排放会显著增加。
Diesel particulate filter（DPF） is an effective device to reduce the particulate matter（PM） emissions from diesel engines. Hydrocarbon（HC） injection active regeneration is the most commonly used PM regeneration approach in DPF systems for heavy-duty diesel engines. However, few experimental studies were conducted on DPF active regeneration processes due to the difficulties in experimental operation. This paper focused on the hydrocarbon injection active regeneration processes of a catalyzed diesel particulate filter（CDPF） on a stationary engine operating point, and the CDPF pressure drop, inner temperature, as well as the emissions during CDPF active regeneration were analyzed. The results show that the localized temperature inside CDPF is much higher than the CDPF inlet and outlet temperature during regeneration, and the temperature gradually increase from the front-end to the rear-end in the axial direction of the CDPF, while the temperature in the middle is the highest, even higher than the temperature in the center, and the temperature in the edge is the lowest in the radial direction of the CDPF. There is a little HC as well as CO slip, and the NO2 concentration is decreasing while the particle number（PN） emission is increasing at the CDPF downstream during regeneration. The CDPF active regeneration control strategy and the emission control method during the regeneration can be developed based on the results.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2016年第16期4402-4407,4526,共6页
Proceedings of the CSEE
基金
国家863计划项目(2013AA065304)
国家重点基础研究发展计划项目(2013CB228502)~~
关键词
催化型柴油机颗粒捕集器
主动再生
气体污染物
颗粒物
catalyzed diesel particulate filter
active regeneration
gaseous pollutants
particulate matters
