柴油机颗粒过滤器再生时颗粒层氧化燃烧特性探究  

Experimental Investigation of Combustion Characteristics of Particulate Layers During Diesel Particulate Filter Regeneration

作　　者：孟忠伟 秦源[1] 方嘉 蒋渊 杜雨恒 杨言 MENG Zhongwei;QIN Yuan;FANG Jia;JIANG Yuan;DU Yuheng;YANG Yan(School of Automobile & Transportation, Xihua University, Chengdu 610039, China;Key Laboratory of Fluid and Power Machinery of Education, Xihua University, Chengdu 610039, China)

机构地区：[1]西华大学汽车与交通学院,成都610039 [2]西华大学流体及动力机械教育部重点实验室,成都610039

出　　处：《内燃机工程》2019年第4期58-63,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金资助项目(51676167);四川省科技厅青年科技创新研究团队(2017TD0026);四川省教育厅科研创新团队项目(17TD0035);西华大学校重点科研项目(Z17101)~~

摘　　要：基于可视化单通道台架,采用激光位移传感器在线测量再生时过滤壁面上颗粒层厚度,采用电镜离线观测颗粒层形貌,探索已沉积的炭黑颗粒层在柴油机颗粒过滤器(DPF)过滤壁面上的再生氧化过程。结果表明,基于颗粒层厚度变化曲线,再生过程分为3个阶段:第Ⅰ阶段,颗粒层厚度缓慢降低;第Ⅱ阶段,颗粒层厚度快速降低,氧化反应主要发生在DPF孔隙气流处,颗粒层表面出现凹坑形貌;第Ⅲ阶段,颗粒层厚度再次缓慢下降。同时,炭黑颗粒微观形貌由均匀堆积形貌向链状和环状形貌变化,颗粒层随氧化的进行呈现凹坑结构。Based on a visual single-channel test bench, the thickness of particulate layer during regeneration process was measured online by laser displacement sensor. The morphology of the particulate layer was observed offline by scanning electron microscope. The particulate layer thicknesses of two soot particles during both deposition and regeneration processes were compared. The results show that the regeneration process can be divided into three stages based on the change of the particulate layer thickness. In the first stage, the thickness of the particulate layer decreases slowly. In the second stage, the thickness of the particulate layer declines rapidly. This attributes to the oxidation reaction that mainly occurrs at pores in the direction of the flow in a diesel particulate filter. As a result, the particulate layer surface has many irregular pits. In the third stage, the thickness of the particulate layer reduces slowly again. Meanwhile, the morphology of carbon black particles changes from a uniform structure to a chain-shaped one. The particulate layer gains pits as oxidation proceeds.

关 键 词：柴油机颗粒过滤器 颗粒层厚度 炭黑沉积 再生 微观形貌 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]