[1]卢凯,臧志成,刘德文,等.非道路柴油机后处理系统SCR喷嘴座结构优化[J].内燃机学报,2022,(03):280-287.
　Lu Kai,Zang Zhicheng,Liu Dewen,et al.Structure Optimization of SCR Nozzle Holder for After-Treatment System of Off-Road Diesel Engine[J].,2022,(03):280-287.
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非道路柴油机后处理系统SCR喷嘴座结构优化
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《内燃机学报》[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2022年03
页码:
280-287
栏目:
出版日期:
2022-05-25

文章信息/Info

Title:
Structure Optimization of SCR Nozzle Holder for After-Treatment System of Off-Road Diesel Engine
作者:
卢凯; 臧志成; 刘德文; 吴燕; 白书战; 李国祥
1. 山东大学 能源与动力工程学院，山东 济南 250061；2. 凯龙高科技股份有限公司，江苏 无锡 214177
Author(s):
Lu Kai; Zang Zhicheng; Liu Dewen; Wu Yan; Bai Shuzhan; Li Guoxiang
1. School of Energy and Power Engineering，Shandong University，Jinan 250061，China； 2. Kailong High Technology Company Limited，Wuxi 214177，China
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
Keywords:
off-road diesel engine; selective catalytic reduction(SCR); crystallization; simulation calculation; nozzle protective cover
分类号:
TK421.5
文献标志码:
A
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．
Abstract:
The main factors affecting the crystallization of nozzle surface were identified on an off-road diesel engine 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 re-ducing the vortex near the nozzle surface. After running the crystallization cycle on a SCR test bench for 30 circula-tion conditions，is it found that the scheme of reducing the holder height and adding the protective cover solves the nozzle crystallization issue and meet the SCR design requirement.

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更新日期/Last Update: 2022-05-25