空气辅助和无空气辅助SCR系统排放和结晶对比  

A Comparative Experimental Study on the Emissions and Crystallization in SCR Systems w/wo Air Assistance

作　　者：刘旭海 王军 张建华 刘正锐 LIU Xuhai;WANG Jun;ZHANG Jianhua;LIU Zhengrui(State Key Laboratory of Engine Reliability,Weifang 261061 ,China;Weichai Power Emission Solutions Technology Co., Ltd.,Weilang 261061, China)

机构地区：[1]内燃机可靠性国家重点实验室,山东潍坊261061 [2]潍柴动力空气净化科技有限公司,山东潍坊261061

出　　处：《内燃机与动力装置》2017年第6期5-9,共5页Internal Combustion Engine & Powerplant

摘　　要：利用高速摄像技术,对比空气辅助和无空气辅助两种典型的SCR尿素喷射系统尿素喷雾粒径,并且以发动机台架试验为基础,通过排放循环和结晶试验对比来研究空气辅助和无空气辅助SCR系统的性能差异。结果表明,空气辅助喷射系统的喷雾粒径明显小于无空气辅助喷射系统,具有良好的喷雾特性;在相同的试验条件下,空气辅助喷射系统较无空气辅助喷射系统排放结果更好,结晶风险更低。By using high-speed photography,an experimental study was conducted to investi-gate the urea spray characteristics of two typical SCR injection systems,namely with or without air assistance. On an engine bench test, comparative emissions and crystallization tests were used to study the performance differences of two SCR injection systems. The results showed that,with air as-sistance ,urea spray particle diameter was significantly smaller than without air assistance,which in-dicated better spray characteristics. Under the same test conditions, with air assistance injection sys-tem had better emission results,and lower crystallization risk.

关 键 词：柴油机 氮氧化物(N0X) SCR 尿素溶液喷雾 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]