主办：陕西省汽车工程学会
ISSN 1671-7988  CN 61-1394/TH
创刊：1976年
汽车实用技术

汽车实用技术 ›› 2024, Vol. 49 ›› Issue (19): 72-76.DOI: 10.16638/j.cnki.1671-7988.2024.019.014

• 设计研究 • 上一篇    

柴油车尿素-SCR 系统数值模拟研究

李驰宇 1，孙强 1，朱一西*1，王志春 2   

  1. 1.无锡职业技术学院 汽车与交通工程学院； 2.无锡锡创汽车环保有限公司
  • 发布日期:2024-10-10
  • 通讯作者: 朱一西
  • 作者简介:李驰宇（2002－），男，研究方向为汽车 CAE 分析，E-mail:2621628068@qq.com。 通信作者：朱一西（1989－），女，博士，讲师，研究方向为计算流体力学、汽车 CAE，E-mail:zhuyixi@wxit.edu.cn。
  • 基金资助:
    江苏省新能源汽车节能与电池安全工程研究中心项目（苏发改高技发〔2022〕1103 号）；江苏省产学研合作 项目（BY2022719；BY20230730）；江苏省高职院校青年教师企业实践培训项目（2023QYSJ112）

Numerical Simulation of Urea-SCR After-Treatment System for Diesel Vehicle

LI Chiyu 1 , SUN Qiang1 , ZHU Yixi*1 , WANG Zhichun2   

  1. 1.School of Automobile and Transportation Engineering, Wuxi Institute of Technology; 2.Wuxi Xichuang Automobile Environmental Protection Company Limited
  • Published:2024-10-10
  • Contact: ZHU Yixi

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摘要： 为提高柴油车尿素-选择性催化还原（SCR）系统的工作性能，文章使用计算流体力学 （CFD）方法对某型柴油汽车排气后处理系统进行了数值模拟，研究了不同排气温度工况下 该尿素-SCR 系统的内部流动及载体前端入口平面上 NH3 分布的均匀性、速度均匀性等参数。 计算结果表明，随着排气温度的升高，SCR 载体前端平面的 NH3 均匀性有明显提升，速度均 匀性也略有增加。此外，根据文章计算结果可知，排气温度越高，喷入尿素-SCR 系统的尿素 溶液蒸发和热解的速率越快，进入催化器的尿素明显减少。文章数值模拟结果可为后续该型 柴油机尿素-SCR 后处理系统的改进优化提供思路。

关键词: 尾气后处理；SCR 系统；排气温度；均匀性

Abstract: To improve the performance of urea-selective catalytic reduction (SCR) system of diesel vehicles, this paper adopts computational fluid dynamics (CFD) method to simulate the exhaust after-treatment system of a certain diesel vehicle. The internal flow of the Urea-SCR system and the uniformity of NH3 distribution and velocity on the front entrance plane of the carrier are studied under different exhaust temperature conditions. The results show that with the increase of exhaust temperature, the NH3 uniformity in front plane of SCR carrier is obviously improved, and the velocity uniformity is also slightly increased. In addition, according to the calculated results in this paper, the higher the exhaust temperature, the faster the evaporation and pyrolysis rate of urea solution injected into the Urea-SCR system, and the urea into the catalytic converter is significantly reduced. The numerical simulation results in this paper can provide ideas for the improvement and optimization of Urea-SCR after-treatment system of this diesel engine.

Key words: Exhaust after treatment; Selective catalytic reduction system; Exhaust gas temperature; Uniformity