Numerical Simulation and Structural Optimization of DOC＋SCR System for Diesel Engine

被引：0
|
作者：
Hu G. [1 ]
Ma L. [1 ]
Liu C. [1 ,2 ]
Zhang L. [1 ]
机构：
[1] School of Mechanical Engineering, Southwest Jiaotong University, Chengdu
[2] State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing
来源：
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2019年 / 37卷 / 02期
关键词：
Computational fluid dynamics; Diesel engine; NO[!sub]x[!/sub] conversion efficiency; Structural optimization;
D O I：
10.16236/j.cnki.nrjxb.201902021
中图分类号：
学科分类号：
摘要：
In order to reduce the pollutant emissions from diesel engines, a DOC+SCR catalytic converter system was proposed. A three-dimensional numerical simulation model of the DOC+SCR catalytic converter was established by using computational fluid dynamics(CFD).The model includes evaporation and decomposition of urea aqueous solution, but ignores the catalytic reduction reaction on the catalyst surface. Based on the simplified model, a calculation method of NOx conversion efficiency was proposed. The numerical model and the NOx conversion efficiency calculation method were verified by test results. Through the numerical simulation of the model, the flow field distribution of the catalytic converter was obtained and several optimization scheme were put forward. The results show that after optimization, in certain conditions, the pressure drop of the catalytic converter system is reduced from 9.98, kPa to 8.60, kPa. Also, the pressure drop caused by the catalyst structure factor is decreased from 2.98, kPa to 1.60, kPa. In addition, the NH3 uniformity index of the SCR can be increased to 93.45%,. The conversion efficiency of NOx can reach up to 92.87%, in certain conditions. © 2019, Editorial Office of the Transaction of CSICE. All right reserved.
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页码：155 / 163
页数：8
相关论文
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