摘要
为解决实际车用Urea-SCR系统低温NOx转化效率低和尿素结晶等弊端,国内外一些学者开始研究固体铵SCR系统以改善SCR系统的特性。本文对比分析了SCR系统氨气前驱体分别为32.5%尿素水溶液和固体铵盐的优劣。阐明了固体铵SCR系统的反应原理,及在排放法规日益严格的社会背景下,该技术在降低柴油汽车尾气NOX排放的优势。并详细介绍了车用固体铵氨气直喷SCR尾气后处理技术的国内外研究进展及其应用情况。最后对固体铵SCR系统的深入研究提出了建议。
In order to solve the shortcomings of low NOx conversion efficiency in low temperature and urea crystallization in practical Urea-SCR system,some scholars at home and abroad have begun to study the solid ammonium SCR system to improve the characteristics of SCR system.In this paper,the advantages and disadvantages of SCR system with 32.5%urea aqueous solution and solid ammonium salt were discussed.It clarifies the reaction principle of solid ammonium SCR system and the advantage of reducing NOX emission from diesel automobile under the social background of increasingly stringent emission regulations.The research progress and application of exhaust gas post-treatment technology of solid ammonium SCR are introduced in detail.Finally,some suggestions are put forward for the further study of solid ammonium SCR system.
作者
叶碧阳
刘会猛
文鑫
王昆朋
宋晓梦
YE Bi-yang;LIU Hui-meng;WEN Xin;WANG Kun-peng;SONG Xiao-meng(Huazhong University of Science and Technology,Wuhan430074,China)
出处
《汽车科技》
2018年第1期50-58,共9页
Auto Sci-Tech
