缸内直喷汽油车颗粒物数量及可溶性有机组分排放特性

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摘要以一辆国V排放缸内直喷汽油车为研究对象，试验研究了NEDC、FTP-75和WLTC对该车颗粒物质量、23nm~2.5μm固态颗粒物数量、5.6~560nm超细颗粒数量及粒径分布、颗粒物有机组分的影响.结果表明：NEDC、FTP-75、WLTC颗粒粒径分布基本相同，均呈对数双峰分布，在9nm和60nm两个粒径处出现峰值；5.6~23nm颗粒物数量排放占5.6~560nm颗粒物数量的43.1%~57.7%；与NEDC比较，加减速比例高、瞬态性强的FTP-75、WLTC循环的颗粒物质量、23nm~2.5μm固态颗粒数量、5.6~560nm颗粒数量排放增大；缸内直喷汽油车的颗粒物可溶性有机物组分占颗粒物的20.5%~27.9%，可溶性有机物主要为C16和C18的脂肪酸、C20~C29烷径和5环以上的高分子量多环芳烃，测试循环对颗粒SOF排放及组分产生影响，瞬态性强的FTP-75、WLTC的PAHs比例增加.

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	胡志远
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关键词 ：缸内直喷型汽油车, 颗粒物质量, 颗粒物数量, 粒径分布, 可溶性有机物

Abstract：The emission characteristics of particulate mass, particle number, particle size distribution and the composition of soluble organic fractions from a stoichiometric gasoline direct injection (GDI) vehicle certified to China V emission standard over different test cycles i.e., New European driving cycle (NEDC), worldwide harmonized light vehicle test cycle (WLTC) and USA federal test procedure-75 (FTP-75)) were investigated. The results showed that particle size distribution over NEDC, FTP-75, and WLTC was basically the same, with a logarithmic bimodal distribution, when the peaks occurred at 9nm and 60nm; 5.6~23nm particulate matter emissions occupy 43.1%~57.7% of the 5.6~560nm particulate matter. Compared with NEDC, particulate mass, 23nm~2.5μm solid particle number and 5.6~560nm particle number emissions of FTP-75 and WLTC increased due to their higher deceleration and acceleration ratios and the stronger transient performance; soluble organic fraction accounted for 20.5%~27.9% of the particulate matter emitted from gasoline direct injection vehicle. The soluble organic fraction mainly contained C16 and C18 fatty acids, C20~C29 alkane diameter and high molecular weight polycyclic aromatic hydrocarbons with 5 rings or more, while different test cycles showed diverse impact on SOF emission and its components, FTP-75 and WLTC with stronger transient performance revealed higher proportion of PAHs.

Key words： GDI vehicles particle mass particle number size distribution soluble organic fraction

收稿日期: 2020-07-21

PACS:

X51

基金资助:国家重点研发计划（2017YFB0103405）

通讯作者: 胡志远,副教授,huzhiyuan@tongji.edu.cn E-mail: huzhiyuan@tongji.edu.cn

作者简介: 胡志远(1970-),男,河北安国人,副教授,博士,主要研究方向为汽车能源技术及汽车低排放设计技术.发表论文100余篇.

引用本文:

胡志远, 夏孝程, 宋博, 全轶枫. 缸内直喷汽油车颗粒物数量及可溶性有机组分排放特性[J]. 中国环境科学, 2021, 41(3): 1095-1101. HU Zhi-yuan, XIA Xiao-cheng, SONG Bo, QUAN Yi-feng. Particle number and soluble organic fraction characteristics of particle emissions from gasoline direct injection vehicle. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1095-1101.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2021/V41/I3/1095

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