小型通用汽油机后处理催化剂性能对比及评价  

Performance Comparison and Evaluation of the Aftertreatment Catalyst Part of Small Utility Gasoline Engine

作　　者：谭致 夏鸿茂 肖建华[1] 王磊[3] 华伦[4] 帅石金[1] TAN Zhi;XIA HongMao;XIAO Jianhua;WANG lei;HUA Lun;SHUAI ShiJin(State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China;Zhejiang Zhongjian Technology Co.Ltd.,Jinhua Zhejiang 321300,China;College of Mechanical and Electrical Engineering,Yantai University,Yantai Shandong 264000,China;Suzhou Automobile Research Institute of Tsinghua University,Suzhou Jiangsu 215200,China)

机构地区：[1]清华大学汽车安全与节能国家重点实验室,北京100084 [2]浙江中坚科技股份有限公司,浙江金华321300 [3]烟台大学机电汽车工程学院,山东烟台264000 [4]清华大学苏州研究院,江苏苏州215200

出　　处：《交通节能与环保》2020年第6期19-22,共4页Transport Energy Conservation & Environmental Protection

基　　金：国家重点研发计划项目(2017YFC0211301,2017YFC0211305)。

摘　　要：本文以158F四冲程小型通用汽油机为研究对象,以100%负荷的尾气为输入条件,通过在排气入口注入高压空气的方法调整排气空燃比。然后在稳态工况下,分析不同催化剂对不同排气空燃比的转化效率。通过对空心、氧化性催化剂(DOC)和三效催化剂(TWC)进行比较,得出以下结果:在不装催化器的情况下,尾气中HC、CO、NOX的转化效率都比较低;相较于DOC,在TWC中HC和CO的转化效率随空燃比增大均是先快后慢,最后趋于相同;TWC对NOX的催化效率明显优于DOC,但随空燃比增大差距逐渐缩小至均趋于0;无铑催化时NOX在DOC中依然有较高转化效率。In this study,the exhaust gas of 158f four-stroke small utility gasoline engine at 100%load is taken as the input condition and adjusts the exhaust air-fuel ratio by injecting high pressure air into the exhaust inlet.Then,the conversion efficiency of different catalysts to different ratio of exhaust to air to fuel under steady condition is analyzed.By compared with hollow,oxidizing catalyst(DOC)and three-way catalyst(TWC),the following results are obtained:The conversion efficiency of HC、CO、NOXin the tail gas without catalyst loading is low.Compared with DOC,the conversion efficiency of HC and CO is first higher than that of DOC and then lower,finally tends to be the same in TWC with the air-fuel ratio increase.The catalytic efficiency of TWC on NOXwas obviously higher than that of DOC,but the difference gradually decreased to zero with the increase of air-fuel ratio.NOXstill has high conversion efficiency in DOC without rhodium.

关 键 词：小通机 后处理 氧化催化剂 三效催化剂 

分 类 号：U469.7[机械工程—车辆工程]