Structure Optimization of SCR Nozzle Holder for After-Treatment System of Off-Road Diesel Engine

被引：0
作者：
Lu K. [1 ,2 ]
Zang Z. [2 ]
Liu D. [2 ]
Wu Y. [2 ]
Bai S. [1 ]
Li G. [1 ]
机构：
[1] School of Energy and Power Engineering, Shandong University, Jinan
[2] Kailong High Technology Company Limited, Wuxi
来源：
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2022年 / 40卷 / 03期
关键词：
Crystallization; Nozzle protective cover; Off-road diesel engine; Selective catalytic reduction(SCR); Simulation calculation;
D O I：
10.16236/j.cnki.nrjxb.202203035
中图分类号：
学科分类号：
摘要：
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 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. © 2022, Editorial Office of the Transaction of CSICE. All right reserved.
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页码：280 / 287
页数：7
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