DOC气态污染物转化率影响因素研究  

Study on factors affecting conversion efficiency of gaseous pollutants in DOC

作　　者：程晓章 朱博文 王浩 常啸天 邢晓通 CHENG Xiaozhang;ZHU Bowen;WANG Hao;CHANG Xiaotian;XING Xiaotong(School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]合肥工业大学汽车与交通工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2021年第10期1333-1338,共6页Journal of Hefei University of Technology：Natural Science

摘　　要：为了研究柴油机氧化型催化转换器(diesel oxidation catalyst,DOC)气态污染物转化效率影响因素,文章基于GT-POWER仿真软件对DOC的化学反应过程进行了数值仿真和试验验证。研究表明:建立的DOC仿真模型可以很好地模拟DOC催化反应过程;在低温时,CO转化率能达到99%以上,HC和NO转化率随进气量增大而下降,HC转化率稳定在82%左右,NO转化率最终降为0%;在280~550℃时,进气流量对于CO、HC和NO转化率没有显著的影响,CO能被完全氧化,HC转化率稳定在90%左右,NO转化率随温度的升高先上升再下降,320℃时转化率最高,约为60%。In order to study the factors influencing the gaseous pollutant conversion efficiency of diesel oxidation catalyst(DOC),the chemical reaction process of DOC was simulated and verified by GT-POWER simulation software.The results show that the DOC simulation model can simulate the catalytic reaction process of DOC very well.At low temperature,the conversion of CO can reach more than 99%,the conversion of HC and NO decreases with the increase of inlet gas,the conversion of HC is stable at about 82%,and the conversion of NO finally reduces to 0%.At 280-550℃,the inlet flow rate has no significant effect on the conversion of CO,HC and NO.CO can be completely oxidized,the conversion of HC is stable at about 90%,the conversion of NO increases at first and then decreases with the increase of temperature,and the conversion at 320℃is the highest(about 60%).

关 键 词：柴油机 氧化型催化转换器(DOC) 温度 转化效率 气态污染物 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]