国Ⅴ柴油机SCR系统结构对尿素结晶影响研究

冯刚1; 2; 王奉双1; 2; 毛伟3; 白冰3; 郎俊宇1; 2; 郑贯宇1; 2

doi:10.3969/j.issn.1001-2222.2017.06.013

车用发动机 >

2017 , Vol. 0 >Issue 6: 65 - 70

DOI: https://doi.org/10.3969/j.issn.1001-2222.2017.06.013

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国Ⅴ柴油机SCR系统结构对尿素结晶影响研究

冯刚1 ,
2 ,
王奉双1 ,
2 ,
毛伟3 ,
白冰3 ,
郎俊宇1 ,
2 ,
郑贯宇1 ,
2

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（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；
3.天纳克（苏州）排放系统有限公司，江苏昆山 215300）

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Influence of SCR System Structure on Urea Crystallization for China Ⅴ Diesel Engine

FENG Gang1 ,
2 ,
WANG Fengshuang1 ,
2 ,
MAO Wei3 ,
BAI Bing3 ,
LANG Junyu1 ,
2 ,
ZHENG Guanyu1 ,
2

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（1.State Key Laboratory of Engine Reliability,Wei Fang 261061,China;
2.Weichai Power Emission Solutions Technology Co.,Ltd.,Wei Fang 261061,China; 3.Tenneco(Suzhou) Emission System Co.,Ltd.,Kunshan 215300,China)

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摘要

针对某国Ⅴ商用柴油车SCR系统中出现的结晶问题，综合应用CFD模拟和台架试验进行分析研究，提出一系列结构优化和改进方案，改善了SCR前流场状态以及流体的流动均匀性和尿素均匀性，基本消除了排气系统在实际工况下的结晶风险，提高了全系统的抗结晶能力，保证了SCR系统的正常运行。通过对模拟结果和台架试验数据的比对分析，研究了流场分布以及混合器结构对结晶形成产生的影响。

关键词： 柴油机; 选择性催化还原; 结构优化; 尿素结晶

本文引用格式

冯刚1 , 2 , 王奉双1 , 2 , 毛伟3 , 白冰3 , 郎俊宇1 , 2 , 郑贯宇1 , 2 . 国Ⅴ柴油机SCR系统结构对尿素结晶影响研究[J]. 车用发动机, 2017 , 0(6) : 65 -70 . DOI: 10.3969/j.issn.1001-2222.2017.06.013

Abstract

For the urea crystallization in SCR system of China Ⅴ commercial diesel vehicle, a series of structure optimization schemes were put forward by using the methods of CFD simulation and bench test. The improved structure ameliorated the flow distribution and flow uniformity as well as urea vapor uniformity. Therefore, the crystallization risk of SCR system was eliminated and it could run normally. In addition, the influences of flow distribution and system structure on urea crystallization were studied by comparing simulation results with bench test data.

Key words： diesel engine; SCR; structure optimization; urea crystallization

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