Experimental and numerical investigations into effects of urea-water solution injection on tailpipe particulate matter emissions

被引：6
|
作者：
Shen, Boxi [1 ]
Li, Zhijun [1 ]
Kong, Xiangjin [2 ]
Li, Mengliang [3 ]
Li, Zhenguo [3 ]
Shuai, Shijuin [4 ]
Liu, Shiyu [4 ]
机构：
[1] Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China
[2] Weichai Power Co Ltd, Weifang 261041, Peoples R China
[3] China Automot Technol & Res Ctr Co Ltd, Tianjin 300300, Peoples R China
[4] Tsinghua Univ, State Key Lab Automot Safety & Energy, Beijing 100084, Peoples R China
来源：
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION | 2021年 / 148卷
基金：
中国国家自然科学基金;
关键词：
Air pollution prevention; Diesel engine; Selective catalytic reduction; Particulate matter; Urea decomposition; Secondary breakup; SELECTIVE CATALYTIC-REDUCTION; DIESEL-ENGINE; SOLUTION DROPLET; SCR; NOX; IMPACT; PERFORMANCE; EVAPORATION; SYSTEM; MODEL;
D O I：
10.1016/j.psep.2021.01.053
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Selective catalytic reduction (SCR) is currently the most effective method to control NOx emissions for heavy-duty vehicles. However, urea-water solution injection may lead to increase of particulate matter (PM) emissions. In this study, PM emissions caused by urea-water solution injection from a China VI heavy-duty vehicle under real-world driving conditions is investigated experimentally. Average PM number emissions increase by over 200 % due to urea-water solution injection. Inlet temperature and space velocity are found to be significant factors. Droplet depletion model is developed for analyzing the contribution of urea decomposition by-products. Results suggest that secondary-breakup-based particles is major contributor to particles formation instead of primary-breakup-based. About 20 % of secondary-breakup-based particles are nuclei mode particles and 80 % are accumulation mode particles. The main component of the secondary-breakup-based particles is cyanuric acid and ammelide. (C) 2021 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：927 / 938
页数：12
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