结构参数对Urea-SCR系统性能的影响研究*

doi:10.19562/j.chinasae.qcgc.2019.01.005

汽车工程 ›› 2019, Vol. 41 ›› Issue (1): 29-35.doi: 10.19562/j.chinasae.qcgc.2019.01.005

结构参数对Urea-SCR系统性能的影响研究^*

王军¹, 赵琛¹, 董彦¹, 赵闯², 朱磊²

1.江苏大学汽车与交通工程学院,镇江 212013;
2.凯龙高科技股份有限公司,无锡 214153

收稿日期:2018-01-26 出版日期:2019-01-25 发布日期:2019-01-25
通讯作者: 王军,副教授,E-mail:qcwjun@ujs.edu.cn。
基金资助:
*国家自然科学基金(51776090)、内燃机燃烧学国家重点实验室开放课题(K2018-05)、江苏省“双创计划”和江苏省高等学校自然科学研究重大项目(18KJA470001)资助。

A Research on the Influence of Structural Parameterson the Performance of Urea-SCR System

Wang Jun¹, Zhao Chen¹, Dong Yan¹, Zhao Chuang², Zhu Lei²

1.School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013;
2.Kailong High Technology Co., Ltd., Wuxi 214153

Received:2018-01-26 Online:2019-01-25 Published:2019-01-25

摘要/Abstract

摘要： 通过建立SCR系统数值模型,对柴油机SCR系统尿素水溶液喷雾分解和催化剂表面的化学反应过程进行模拟。结合台架试验,研究了喷嘴喷射角度α、催化器扩张角β和混合器及其安装位置等因素对SCR系统NO_x转化率、NH₃分布均匀性和液膜质量等的影响规律。结果表明:喷射角度和催化器扩张角的影响规律比较复杂,须根据具体情况选定;加装混合器后,可产生明显的排气旋流,有效延长UWS液滴的运动轨迹,促进其与排气的良好混合,明显提高SCR系统NO_x的转化率,它安装于喷嘴下游100~200mm处较为合理。

关键词: 柴油机, 选择性催化还原, 混合器, 性能, 数值仿真

Abstract: A numerical model for selective catalytic reduction (SCR) system is established, on which the spray decomposition of urea water solution (UWS) and the chemical reaction process on the catalyst surface of diesel SCR system are simulated. Bench tests are also conducted to study the influence of the nozzle injection angle α, the expansion angle β of catalyzer and the mixer and its location on the NO_x conversion rate, the NH₃ distribution uniformity and the liquid film mass of SCR system. The results show that the influence rule of the nozzle injection angle α and the expansion angle β of catalyzer are rather complicated so they should be chosen according to specific situations, while the adding of mixer can produce apparent exhaust swirl, effectively extend the motion trajectory of UWS drops, promote their good mixing with exhaust gas and greatly increase the NO_x conversion rate of SCR system, and it is more reasonable to install the mixer at a location 100-200mm downstream of the nozzle.

Key words: diesel engine, selective catalytic reduction, mixer, performance, numerical simulation

王军, 赵琛, 董彦, 赵闯, 朱磊. 结构参数对Urea-SCR系统性能的影响研究^*[J]. 汽车工程, 2019, 41(1): 29-35.

Wang Jun, Zhao Chen, Dong Yan, Zhao Chuang, Zhu Lei. A Research on the Influence of Structural Parameterson the Performance of Urea-SCR System[J]. , 2019, 41(1): 29-35.

参考文献

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结构参数对Urea-SCR系统性能的影响研究^*

A Research on the Influence of Structural Parameterson the Performance of Urea-SCR System

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