缸内直喷汽油机排放PM_(2.5)的理化特征及影响因素  

Physical and chemical characteristics of PM_(2.5) emissions from gasoline direct injection engine and its influence factors

作　　者：秦艳红[1] 胡敏[1] 李梦仁 王银辉[2] 彭剑飞[1] 郑荣[2] 郑竞[1] 王玉珏[1] 吴宇声[1] 王渝[1] 顾芳婷 杜卓菲[1] 帅石金[2] 

机构地区：[1]北京大学环境科学与工程学院,环境模拟与污染控制国家重点联合实验室,北京100871 [2]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《中国环境科学》2016年第5期1332-1339,共8页China Environmental Science

基　　金：国家自然科学基金(91544214);国家重点基础研究发展计划(2013CB228503,2013CB228502);中国科学院战略性先导科技专项(XDB05010500)

摘　　要：通过发动机台架实验研究了发动机的转速、负荷对缸内直喷（GDI）汽油机排放PM_（2.5）的排放水平、化学组成及颗粒物数浓度等的影响.结果表明：GDI汽油机排放PM_（2.5）,OC,EC的排放因子分别为（49.8±28.2）,（21.6±6.9）,（11.4±10.8）mg/kg.低转速时,PM_（2.5）排放量随着负荷的增加先减少后增加,中、高转速时随着负荷的增加逐渐增加.碳质气溶胶是GDI汽油机排放的PM_（2.5）的主要组成成分,This paper investigated the effect of engine speed and load on the emission factors,characteristics of chemical composition and size distribution of the PM_（2.5） from a GDI engine.Results demonstrated that the emission factors of PM_（2.5）,OC and EC were（49.8±28.2）,（21.6±6.9）,（11.4±10.8）mg/kg.At low engine speed,with the increase of engine load,PM_（2.5） firstly decreased and then gradually increased.While it showed an increasing trend with the increase of load in media and high engine speed.The major components of PM_（2.5） produced from GDI engine were organic matters and element carbons,respectively,accounting for 45.6%～70.6% and 7.9%～42.7%.Particles from GDI engine were bimodal distribution including nucleation mode（10nm〈Dp〈30nm） and accumulation mode（30nm〈Dp〈200nm）.The number concentration of GDI engine was two orders of magnitude higher than that of port fuel injection（PFI） engine.At different engine speeds,accumulation mode particles increased as the load increased.

关 键 词：缸内直喷汽油机 PM_(2.5) 化学组成 排放特征 数谱分布 

分 类 号：X513[环境科学与工程—环境工程]