国六阶段车用柴油机尾气中N_2O排放特性的试验研究

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英文篇名：An Experimental Study on the N_2O Emission Characteristics of China VI Vehicle Diesel Engine 作者：王磊 ; 黄志强 ; 彭程 英文作者：WANG Lei;HUANG Zhiqiang;PENG Cheng;Engine Inspection & Innovation Lab, Shanghai Motor Vehicle Inspection Center Co., Ltd.; 关键词：柴油机 ; N_2O ; 标准循环 ; 后处理系统 ; 排放特性 英文关键词：diesel engine;;N_2O;;standard test-cycle;;after-treatment system;;emission characteristic 中文刊名：内燃机 英文刊名：Internal Combustion Engines 机构：上海机动车检测中心技术有限公司发动机检测研究实验室; 出版日期：2019-08-15 出版单位：内燃机 年：2019 期：04 语种：中文; 页：30-34 页数：5 CN：50-1100/TK ISSN：1000-6494 分类号：X734.2

摘要

以一台满足国六排放标准的车用柴油机为试验对象,通过对国六标准试验循环WHSC和WHTC中N_2O的排放特性进行分析和研究。结果表明:后处理的使用会增加柴油机N_2O排放,其中尿素的喷射与否更会显著地影响N_2O的排放;在WHSC和非再生模式WHTC循环中,N_2O在后处理中的产生主要发生在SCR中,循环浓度峰值的产生主要是由于泄露的NH3在ASC中的氧化。再生模式WHTC循环中,N_2O来自SCR及ASC,由于再生排气温度高且THC排放浓度高,DOC中的催化反应也是N_2O的重要来源。
        Taking a China VI Vehicle Diesel Engine as the test object, the emission characteristics of N_2O are analyzed and studied in the standard test-cycle, WHSC and WHTC. The results show that the use of after-treatment will increase the N_2O emission of diesel engine, and the injection of urea will significantly affect the N_2O emission. In the standard test-cycle, WHSC and non-regeneration WHTC, the generation of N_2O in after-treatment mainly occurs in SCR, and the peak concentration is mainly due to the oxidation reaction of leaked NH_3 in ASC. In WHTC of regeneration mode, N_2O partly comes from SCR and ASC. Because of the high temperature of exhaust and the high concentration of THC emission, catalytic reaction in DOC is also an important source of N_2O emission.

引文

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