选择性催化还原系统尿素分解研究进展  

Research Progress on Urea Decomposition in Selective Catalytic Reduction System

作　　者：张玉娇 黄豪中[1] 张丽娜 陈雅娟 ZHANG Yujiao;HUANG Haozhong;ZHANG Lina;CHEN Yajuan(School of Mechanical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学机械工程学院,广西南宁530004

出　　处：《车用发动机》2024年第3期10-17,共8页Vehicle Engine

基　　金：广西科技重大专项(桂科AA23062090);国家自然科学基金项目(52366007)。

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。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.

关 键 词：选择性催化还原(SCR) 尿素 分解 副产物 反应机理 

分 类 号：TK405[动力工程及工程热物理—动力机械及工程]