基于CFD的SCR混合器设计与结构优化

doi:10.3969/j.issn.1674-0696.2023.05.19

重庆交通大学学报（自然科学版） ›› 2023, Vol. 42 ›› Issue (5): 145-151.DOI: 10.3969/j.issn.1674-0696.2023.05.19

基于CFD的SCR混合器设计与结构优化

王国贤1，吴红静1, 2，吴华伟2，赵千2，杨小兵3

(1. 武汉理工大学交通与物流工程学院，湖北武汉 430063； 2. 湖北文理学院汽车与交通工程学院，湖北襄阳441053； 3. 东风佛吉亚(襄阳)排气系统有限公司，湖北襄阳 441000)

收稿日期:2021-12-28 修回日期:2022-04-12 发布日期:2023-07-13
作者简介:王国贤（1966—），男，湖北浠水人，副教授，博士，主要从事现代机械设计及仿真与优化方面的研究。E-mail:wanggx@whut.edu.cn 通信作者：吴红静（1998—），女，湖北襄阳人，硕士研究生，主要从事现代机械设计方面的研究。E-mail:wuhongjing@whut.edu.cn
基金资助:
中央引导地方科技发展财政专项项目(鄂财政2017［80］号文)；湖北省技术创新专项重大项目(2017AAA133)；湖北省自然科学基金青年基金项目(2020CFB320)；“机电汽车”湖北省优势特色学科群开放基金项目(XKQ2021003，XKQ2021010)

Design and Structure Optimization of SCR Mixer Based on CFD

WANG Guoxian1, WU Hongjing1, 2, WU Huawei2, ZHAO Qian2, YANG Xiaobing3

(1. School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, Hubei, China; 2. School of Automotive and Traffic Engineering, Hubei University of Arts and Science, Xiangyang 441053, Hubei, China; 3. Dongfeng Faurecia (Xiangyang) Exhaust System Co., Ltd., Xiangyang 441000, Hubei, China)

Received:2021-12-28 Revised:2022-04-12 Published:2023-07-13

摘要/Abstract

摘要： 为了提高柴油机选择性催化还原(selective catalytic reduction, SCR)后处理系统氨气分布均匀性，设计了扇形和百叶窗型两种不同的混合器结构。利用计算流体动力学(computational fluid dynamics, CFD)技术对这两种混合器结构进行了优化处理，并针对优化后的两种混合器方案，对其速度均匀性、氨气均匀性、压力损失等进行了仿真分析和对比。CFD分析结果表明：百叶窗型混合器结构催化器载体前端氨气分布均匀性更高，百叶窗型混合器的压力损失小于扇形的；进一步分析排气流量和排气温度对氨气均匀性影响，排气流量增加使得氨气均匀性指数降低，排气温度增加使得氨气均匀性指数增高；百叶窗型的氨气均匀性指数高于扇形的。综合考虑，百叶窗型结构混合器优于扇形结构。

关键词: 车辆工程；选择性催化还原；混合器；分布均匀性；压力损失

Abstract: In order to improve the ammonia distribution uniformity of diesel selective catalytic reduction (SCR) post-treatment system, two different mixer structures, fan-shaped and louver, were designed. The two mixer structures were optimized by using computational fluid dynamics (CFD) technology. For the optimized two mixer schemes, the velocity uniformity, ammonia uniformity and pressure loss were simulated, analyzed and compared. The CFD analysis results show that the louver mixer structure has higher ammonia distribution uniformity at the front end of the catalyst carrier, and the pressure loss of the louver mixer is less than that of the fan-shaped one. Further analysis of the impact of exhaust flow and exhaust temperature on ammonia uniformity shows that an increase in exhaust flow leads to a decrease of ammonia uniformity index, while an increase in exhaust temperature leads to an increase of ammonia uniformity index. The ammonia uniformity index of louver type is always higher than that of fan-shaped structure. Overall, the louvered structure mixer is superior to the fan-shaped structure.

Key words: vehicle engineering; selective catalytic reduction; mixer; distribution uniformity; pressure loss

中图分类号:

U464
TK421.5

王国贤1，吴红静1, 2，吴华伟2，赵千2，杨小兵3. 基于CFD的SCR混合器设计与结构优化[J]. 重庆交通大学学报（自然科学版）, 2023, 42(5): 145-151.

WANG Guoxian1, WU Hongjing1, 2, WU Huawei2, ZHAO Qian2, YANG Xiaobing3. Design and Structure Optimization of SCR Mixer Based on CFD[J]. Journal of Chongqing Jiaotong University(Natural Science), 2023, 42(5): 145-151.

参考文献

［1］隗寒冰，贺少川.基于深度强化学习的插电式柴电混合动力汽车多目标优化控制策略［J］.重庆交通大学学报(自然科学版)，2021，40(1)：44-52.
WEI Hanbing, HE Shaochuan. Multi-objective optimal control strategy for plug-in diesel electric hybrid vehicle based on deep reinforcement learning ［J］. Journal of Chongqing Jiaotong University (Natural Science), 2021, 40(1): 44-52.
［2］ CHEN Ming, WILLIAMS S. Modelling and optimization of SCR-exhaust aftertreatment systems ［C］//SAE 2005 World Congress & Exhibition. 2005: 471-481.
［3］李江飞，牛雨飞，朱海艳，等.混合器对国六柴油机选择性催化还原系统尿素结晶的影响［J］.内燃机工程，2021，42(2)：31-37.
LI Jiangfei, NIU Yufei, ZHU Haiyan, et al. Effects of mixer on urea deposit in selective catalytic reduction for China VI diesel engines ［J］. Chinese Internal Combustion Engine Engineering, 2021, 42(2): 31-37.
［4］余舒，杨志刚.基于DBSCAN和CNN算法的重型车辆NOx排放预测模型［J］.重庆交通大学学报(自然科学版)，2022，41(8)：134-141.
YU Shu, YANG Zhigang. NOx emission prediction model of heavy-duty vehicle based on DBSCAN and CNN algorithm ［J］. Journal of Chongqing Jiaotong University (Natural Science), 2022, 41(8): 134-141.
［5］陈贵升，杨锐敏，和志高，等.选择性催化还原混合器及整流器的设计与结构优化［J］.内燃机工程，2020，41(2)：46-53.
CHEN Guisheng, YANG Ruimin, HE Zhigao, et al. Design and structure optimization of selective catalytic reduction mixer and rectifier ［J］. Chinese Internal Combustion Engine Engineering, 2020, 41(2): 46-53.
［6］ ZHANG Xiaogang, ROMZEK M, MORGAN C. 3-D numerical study of mixing characteristics of NH3 in front of SCR ［C］//Powertrain and Fluid Systems Conference and Exhibition. 2006: 25269-25281.
［7］刘军，王明远，周磊，等.基于优化尿素液滴蒸发特性的SCR混合器［J］.内燃机学报，2018，36(4)：332-337.
LIU Jun, WANG Mingyuan, ZHOU Lei, et al. SCR mixer based on an optimization of urea droplet evaporation ［J］. Transactions of CSICE, 2018, 36(4): 332-337.
［8］王谦，张铎，何志霞，等.柴油机Urea-SCR系统数值模拟与混合器结构优化［J］.内燃机工程，2015，36(3)：50-57.
WANG Qian, ZHANG Duo, HE Zhixia, et al. Numerical simulation of diesel engine urea-SCR system and its mixer structure optimization ［J］. Chinese Internal Combustion Engine Engineering, 2015, 36(3): 50-57.
［9］冯刚，王奉双，毛伟，等.国Ⅴ柴油机SCR系统结构对尿素结晶影响研究［J］.车用发动机，2017(6)：65-70.
FENG Gang, WANG Fengshuang, MAO Wei, et al. Influence of SCR system structure on urea crystallization for China V diesel engine ［J］. Vehicle Engine, 2017(6): 65-70.
［10］吕祎强.柴油机Urea-SCR混合器的设计与结构优化［J］.自动化应用，2019(5)：41-44.
LYU Yiqiang. Design and structural optimization of urea-SCR mixer for diesel engine ［J］. Automation Application, 2019(5): 41-44.
［11］王文晓.大功率非道路柴油机尿素SCR系统的仿真分析与试验研究［D］.青岛：青岛大学，2020.
WANG Wenxiao. Simulation Analysis and Experimental Research on Urea SCR System of High-Power Off-Road Diesel Engine ［D］. Qingdao: Qingdao University, 2020.
［12］杨延相，张洪涛，张元清，等.道路车用柴油机国六排放选择性催化还原系统的开发与验证［J］.内燃机工程，2020，41(2)：39-45.
YANG Yanxiang, ZHANG Hongtao, ZHANG Yuanqing, et al. Development and validation of a selective catalytic reduction system for China VI regulations compliant on-road diesel engine ［J］. Chinese Internal Combustion Engine Engineering, 2020, 41(2): 39-45.
［13］汤婷.柴油机Urea-SCR系统还原剂生成与分布均匀性研究［D］.杭州：浙江大学，2020.
TANG Ting. Study on the Generation and Distribution Uniformity of Reducing Agent for Diesel Engine Urea-SCR ［D］. Hangzhou: Zhejiang University, 2020.
［14］赵彦光，胡静，陈镇，等.重型柴油机NOx尿素SCR混合器的设计与试验研究［J］.内燃机工程，2012，33(1)：32-37.
ZHAO Yanguang, HU Jing, CHEN Zhen, et al. Design and experiment of mixer in NOx urea-selective catalyst reduction system for heavy duty diesel engine ［J］. Chinese Internal Combustion Engine Engineering, 2012, 33(1): 32-37.
［15］赵英良.大功率柴油机SCR系统仿真分析与试验研究［D］.青岛：青岛大学，2019.
ZHAO Yingliang. Simulation Analysis and Experimental Research on SCR System of High-Power Diesel Engine［D］. Qingdao: Qingdao University, 2019.
［16］陈悦，吕林.船用柴油机SCR系统混合器仿真与试验研究［J］.哈尔滨工程大学学报，2016，37(1)：24-29.
CHEN Yue, LYU Lin. Numerical simulation and experimental study of static mixers for a marine SCR system ［J］. Journal of Harbin Engineering University, 2016, 37(1): 24-29.
［17］宋志良，成薛峰，王再兴，等.柴油机Urea_SCR混合器的设计选型分析［J］.内燃机与配件，2020(10)：68-71.
SONG Zhiliang, CHENG Xuefeng, WANG Zaixing, et al. Analysis on the selection of the urea SCR mixer for diesel engine ［J］. Internal Combustion Engine & Parts, 2020(10): 68-71.

基于CFD的SCR混合器设计与结构优化

Design and Structure Optimization of SCR Mixer Based on CFD

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