催化型微粒捕集器碳烟分布及其影响因素

doi:10.13229/j.cnki.jdxbgxb20170655

吉林大学学报(工学版) ›› 2018, Vol. 48 ›› Issue (5): 1466-1474.doi: 10.13229/j.cnki.jdxbgxb20170655

催化型微粒捕集器碳烟分布及其影响因素

李志军¹, 汪昊¹, 何丽¹, 曹丽娟¹, 张玉池², 赵新顺³

1.天津大学内燃机燃烧学国家重点实验室,天津 300072;
2.天津市津聿动力科技有限公司, 天津 300221;
3.广东白云学院机电工程学院,广州 510450

收稿日期:2017-06-27 出版日期:2018-09-20 发布日期:2018-12-11
作者简介:李志军(1962-),男,教授,博士生导师.研究方向:内燃机排放与控制.E-mail:zhijunli@tju.edu.cn
基金资助:
国家自然科学基金项目(51576140, 51276128);科技部中欧中小企业节能减排发展专项基金项目(SQ2013ZOA100012);清华大学汽车安全与节能国家重点实验室开放基金项目(KF1818)

Soot distribution features and its influence factors in catalytic diesel particulate filte

LI Zhi-jun¹, WANG Hao¹, HE Li¹, CAO Li-juan¹, ZHANG Yu-chi², ZHAO Xin-shun³

1.State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China;
2.Tianjin Jinyu Power Technology Co. Ltd., Tianjin 300221, China;
3.Faculty of Mechanical and Electrical Engineering, Guangdong Baiyun University,Guangzhou 510450, China

Received:2017-06-27 Online:2018-09-20 Published:2018-12-11

摘要/Abstract

摘要： 建立了催化型柴油机微粒捕集器(CDPF)的数学模型,通过相关试验验证了模型的正确性,分析了CDPF排气参数和结构参数对碳烟分布的影响。研究结果表明:壁面层的碳烟质量浓度呈现先急剧上升后缓慢减少的特点;滤饼层的碳烟分布呈现两端高、轴向无量纲位置x=0.3左右的位置最低的分布特性。随着排气参数(温度、流量、氧体积分数、NO₂体积分数)的增大,壁面积累碳烟质量浓度减少,其中温度的影响最大;排气流量的增大会使滤饼层碳烟分布最低点位置逐渐向前端移动。结构参数(长径比、进出口孔径比、孔密度)对滤饼层碳烟分布形状影响较大,随着结构参数的增大,滤饼层碳烟分布趋于不均匀,其中孔密度的变化对滤饼层碳烟分布影响最大,孔密度的增大会使最低点位置向后端移动;进出口孔径的增大使最低点位置向前端移动。

关键词: 动力机械工程, 催化型微粒捕集器, 碳烟分布, 排气参数

Abstract: A mathematical model of Catalytic Diesel Particulate Filter (CDPF) was built up. The exhaust parameters and structure parameters were analyzed, and the model was validated through experimental data. The results show that the mass in the filter wall increases steeply and then decreases slowly. Soot distribution in the cake layer has a minimum thickness for appropriately 30% of the total channel length. While, the edges at the inlet and outlet have the maximum thickness. The exhaust parameters, including temperature, flow rate, the concentration of O₂ and the concentration of NO₂, mainly influence the thickness of soot distribution by influencing performance of the NO₂ assisted regeneration. The temperature has the largest influence, and the thickness of soot distribution in the cake layer is more sensitive to the concentration of NO₂ than O₂. The structure parameters, including the ratio of length to diameter, the ratio of inlet diameter to outlet diameter and channel density have significant effects on the shape of the soot distribution in the cake layer. With the increase in the structure parameters, the soot distribution tends to be uneven, and the channel density has the largest impact, which means the position of the lowest point tends to move to the rear end, while the increase in the ratio of inlet diameter to outlet diameter leads the point to move to the front end.

Key words: power machinery and engineering, catalytic diesel particulate filter(CDPF), soot distribution, exhaust parameters

中图分类号:

TK421.5

李志军, 汪昊, 何丽, 曹丽娟, 张玉池, 赵新顺. 催化型微粒捕集器碳烟分布及其影响因素[J]. 吉林大学学报(工学版), 2018, 48(5): 1466-1474.

LI Zhi-jun, WANG Hao, HE Li, CAO Li-juan, ZHANG Yu-chi, ZHAO Xin-shun. Soot distribution features and its influence factors in catalytic diesel particulate filte[J]. Journal of Jilin University(Engineering and Technology Edition), 2018, 48(5): 1466-1474.

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催化型微粒捕集器碳烟分布及其影响因素

Soot distribution features and its influence factors in catalytic diesel particulate filte

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