关键运行参数对柴油机SCR系统性能的影响

doi:10.3969/j.issn.0438-1157.2014.10.041

化工学报 ›› 2014, Vol. 65 ›› Issue (10): 4063-4070.DOI: 10.3969/j.issn.0438-1157.2014.10.041

关键运行参数对柴油机SCR系统性能的影响

谭丕强, 杜加振, 胡志远, 楼狄明

同济大学汽车学院, 上海 201804

收稿日期:2014-02-14 修回日期:2014-05-31 出版日期:2014-10-05 发布日期:2014-10-05
通讯作者: 谭丕强
基金资助:
国家自然科学基金项目（50906062）；国家高技术研究发展计划项目（2012AA111717）；内燃机燃烧学国家重点实验室开放基金项目（2012）。

Effects of key operating parameters on SCR performance of diesel engines

TAN Piqiang, DU Jiazhen, HU Zhiyuan, LOU Diming

School of Automobile, Tongji University, Shanghai 201804, China

Received:2014-02-14 Revised:2014-05-31 Online:2014-10-05 Published:2014-10-05
Supported by:
supported by the National Natural Science Foundation of China (50906062), the National High Technology Research and Development Program of China (2012AA111717) and Open Funds of State Key Laboratory of Engines (2012).

摘要/Abstract

摘要： 建立了柴油机选择性催化还原SCR系统的仿真模型，提出了尿素分解效率的概念。研究了排气温度、NH₃存储量、NO₂/NO_x、NH₃/NO_x等关键运行参数对NO_x转化率的影响。研究结果表明，随着排气流速的减小和排气温度的增加，尿素分解效率总体呈升高趋势。进行了不同温度下NO_x转化率的评价试验研究，仿真结果和试验结果吻合良好。随NH₃存储量的增加，NO_x转化率呈上升趋势。随排气温度的升高，NO_x转化率持续上升，当温度超过某一值后趋于稳定。随NO₂/NO_x的增加，NO_x转化率逐渐上升，当NO₂/NO_x超过50%后，NO_x转化率则有所下降；NO_x转化率随NH₃/NO_x的增大而上升，当排气温度较高时，其影响较为明显。

关键词: SCR, 柴油机, 污染, 模型, 尿素分解效率, NO_x转化率, 运行参数

Abstract: A simulation model for selective catalytic reduction (SCR) of exhaust gas from diesel engine is established, and a concept of urea decomposition efficiency is proposed. Effects of exhaust gas temperature, NH₃ storage, NO₂/NO_x ratio and NH₃/NO_x ratio on the NO_x conversion efficiency are studied. The results show that the urea decomposition efficiency increases with decreasing exhaust gas flow rate and rising exhaust gas temperature. Special evaluating experiments for NO_x conversion efficiency under various temperatures were performed. The data obtained by simulation show good agreement with the experimental results. The results show that the NO_x conversion efficiency increases with the NH₃ storage capacity rising. Similarly, the NO_x conversion efficiency increases with rising exhaust gas temperature, and it gets stable when the exhaust gas temperature reaches a certain value. Increasing NO₂/NO_x ratio can also improve the NO_x conversion efficiency, but the opposite phenomenon occurs when the NO₂/NO_x ratio is greater than 50%. With increase of NH₃/NO_x ratio, the NO_x conversion efficiency ascends, and the influence is obvious when the exhaust gas temperature is high.

Key words: SCR, diesel engine, pollution, model, urea decomposition efficiency, NO_x conversion efficiency, operating parameter

中图分类号:

谭丕强, 杜加振, 胡志远, 楼狄明. 关键运行参数对柴油机SCR系统性能的影响[J]. 化工学报, 2014, 65(10): 4063-4070.

TAN Piqiang, DU Jiazhen, HU Zhiyuan, LOU Diming. Effects of key operating parameters on SCR performance of diesel engines[J]. CIESC Journal, 2014, 65(10): 4063-4070.

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关键运行参数对柴油机SCR系统性能的影响

Effects of key operating parameters on SCR performance of diesel engines

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