摘要
采用模拟计算以及试验验证方法,对不同喷嘴座方案进行分析,确定了影响非道路柴油机选择性催化还原(SCR)后处理系统中喷嘴表面结晶的主要因素.结果表明:喷嘴表面温度和喷嘴表面附近涡流是影响喷嘴表面结晶严重程度的重要因素,喷嘴表面温度越低喷嘴表面的结晶量就越少,喷嘴表面附近应避免涡流出现.降低喷嘴座高度并在内部增加防护罩可避免喷嘴表面温度过高,同时有效减小了喷嘴表面附近的涡流,降低了喷嘴表面的结晶风险.通过在SCR测试台架上运行结晶循环工况30个循环后降低喷嘴座高度并在内部增加防护罩的方案,解决了喷嘴表面结晶的问题,满足SCR设计要求.
The main factors affecting the crystallization of nozzle surface were identified on an off-road diesel en-gine with the after-treatment system of selective catalytic reduction(SCR)by analyzing different nozzle holder schemes with simulation calculation and experimental validation.The results show that the temperature on the nozzle surface and the vortex near the nozzle are two important factors that affect the severity of nozzle crystallization.The amount of nozzle crystallization becomes less when the nozzle temperature is lower and the vortex near the nozzle surface is removed.Reducing the height of the nozzle holder and adding a protective cover inside the holder can significantly reduce the crystallization risk on the nozzle surface due to avoiding too high nozzle temperature and effectively reducing the vortex near the nozzle surface.After running the crystallization cycle on a SCR test bench for 30 circulation conditions,it is found that the scheme of reducing the holder height and adding the protective cover solves the nozzle crystallization issue and meets the SCR design requirement.
作者
卢凯
臧志成
刘德文
吴燕
白书战
李国祥
Lu Kai;Zang Zhicheng;Liu Dewen;Wu Yan;Bai Shuzhan;Li Guoxiang(School of Energy and Power Engineering,Shandong University,Jinan 250061,China;Kailong High Technology Company Limited,Wuxi 214177,China)
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2022年第3期280-287,共8页
Transactions of Csice
关键词
非道路柴油机
选择性催化还原
结晶
模拟计算
喷嘴防护罩
off-road diesel engine
selective catalytic reduction(SCR)
crystallization
simulation calculation
nozzle protective cover
