选择性催化还原系统尿素分解研究进展

张玉娇; 黄豪中; 张丽娜; 陈雅娟

doi:10.3969/j.issn.1001-2222.2024.03.002

车用发动机 >

2024 , Vol. 0 >Issue 3: 10 - 17

DOI: https://doi.org/10.3969/j.issn.1001-2222.2024.03.002

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选择性催化还原系统尿素分解研究进展

张玉娇 ,
黄豪中 ,
张丽娜 ,
陈雅娟

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(广西大学机械工程学院，广西南宁 530004)

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Research Progress on Urea Decomposition in Selective Catalytic Reduction System

ZHANG Yujiao ,
HUANG Haozhong ,
ZHANG Lina ,
CHEN Yajuan

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(School of Mechanical Engineering,Guangxi University,Nanning 530004,China)

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摘要

选择性催化还原（selective catalytic reduction，SCR）技术是降低柴油机氮氧化物(NO_x)排放的有效手段，而在柴油机ureaSCR系统中，尿素分解在NO_x还原过程中起着重要作用。阐述了尿素分解的研究现状，重点讨论了副产物的反应路径和反应温度。分析了催化剂对尿素分解的催化作用，总结了减少沉积物的4种措施。提出了未来技术改进的3个方向:研究实际工况下的详细反应机理；使用详细分解机理进行数值模拟同时降低时间成本；使用催化剂提高中间体的反应速率。

关键词： 选择性催化还原（SCR）; 尿素; 分解; 副产物; 反应机理

本文引用格式

张玉娇 , 黄豪中 , 张丽娜 , 陈雅娟 . 选择性催化还原系统尿素分解研究进展[J]. 车用发动机, 2024 , 0(3) : 10 -17 . DOI: 10.3969/j.issn.1001-2222.2024.03.002

Abstract

Selective catalytic reduction(SCR) technology is an effective means to reduce NO_x emissions. In the urea-SCR system of diesel engine, urea decomposition plays an important role in the NO_x reduction process. The current research status of urea decomposition was elaborated with a focus on discussing the reaction pathways and temperatures of by-products. In addition, the catalytic effect of catalysts on urea decomposition was briefly discussed, and four measures to reduce deposits were summarized. Finally, three directions for future technological improvement were proposed: studying the detailed reaction mechanism under actual operating conditions, using detailed decomposition mechanisms for numerical simulation while reducing time cost, and using catalysts to increase the reaction rate of intermediates.

Key words： selective catalytic reduction(SCR); urea; decomposition; by-product; reaction mechanism

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