DOC+CDPF连续再生性能的试验研究  

Performance of DOC+CDPF Continuous Regeneration

作　　者：李鉴松 孟忠伟 罗林 吴泉成[1] 晋兆祥 佘占蛟 LI Jiansong;MENG Zhongwei;LUO Lin;WU Quancheng;JIN Zhaoxiang;SHE Zhanjiao(Department of Mechanical and Electrical Engineering,Nanchong Vocational and Technical College,Nanchong 637131,China;Vehicle Measurement,School of Automobile&Transportation,Xihua University,Chengdu 610039,China;Cummins(China)Investment Co.,Ltd.,Beijing 100102,China)

机构地区：[1]南充职业技术学院机电工程系,四川南充637131 [2]西华大学汽车与交通学院,四川成都610039 [3]康明斯(中国)投资有限公司,北京100102

出　　处：《车用发动机》2022年第5期8-14,共7页Vehicle Engine

基　　金：国家自然科学基金项目(51676167)。

摘　　要：基于柴油机台架,通过改变来流温度,探索再生温度对DOC+CDPF后处理系统连续再生速率、温度场分布和气体排放等影响的规律。试验结果表明:CDPF滤饼层捕集阶段,随着颗粒物的沉积,单位沉积质量的压降变化速率增幅约为69.8%。CDPF再生过程中,颗粒物的氧化主要集中在载体的前半部分,再生温度升高,NO_(2)消耗量增加,再生速率加快,载体出口NO_(x)总量略有下降,CO和THC下降幅度分别为99%和80%~90%。此外,再生时CDPF中心的轴向温度由前向后先上升后下降,载体边缘的轴向温度由前向后不断上升,再生温度越高,轴向温度梯度越大;径向温度由中心向边缘不断减小,且距离载体入口的距离越小,再生温度越高,径向温度梯度越大。Based on the diesel engine bench,the influence of regeneration temperature on continuous regeneration rate,temperature field distribution and gas emission was explored by changing the inflow temperature.The test results show that the change rate of pressure drop per unit deposition mass increases by about 69.8%with the deposition of particles in the capture stage of CDPF filter cake layer.During CDPF regeneration,the oxidation of particles is mainly concentrated in the first half of carrier.With the increase of regeneration temperature,the consumption of NO_(2) increases,the regeneration rate accelerates,and the total amount of NO_(x) at carrier outlet decreased slightly and the decreases of CO and THC were 99%and 80%-90%respectively.In addition,the axial temperature in the center of CDPF increases first and then decreases from front to back,and the axial temperature at the edge of carrier increases continuously from front to back.The higher regeneration temperature has the greater axial temperature gradient.The radial temperature decreases from center to edge,and the smaller distance from carrier inlet,the higher regeneration temperature and the greater radial temperature gradient.

关 键 词：柴油机 氧化型催化转换器 催化型颗粒捕集器 连续再生 温度场 排放 

分 类 号：TK424.5[动力工程及工程热物理—动力机械及工程]