Physical and chemical characteristics of PM2.5 emissions from gasoline direct injection engine and its influence factors
QIN Yan-hong1, HU Min1, LI Meng-ren1, WANG Yin-hui2, PENG Jian-fei1, ZHENG Rong2, ZHENG Jing1, WANG Yu-jue1, WU Yu-sheng1, WANG Yu1, GU Fang-ting1, DU Zhuo-fei1, SHUAI Shi-jin2
1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;
2. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
This paper investigated the effect of engine speed and load on the emission factors, characteristics of chemical composition and size distribution of the PM2.5 from a GDI engine. Results demonstrated that the emission factors of PM2.5, 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, PM2.5 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 PM2.5 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.
秦艳红, 胡敏, 李梦仁, 王银辉, 彭剑飞, 郑荣, 郑竞, 王玉珏, 吴宇声, 王渝, 顾芳婷, 杜卓菲, 帅石金. 缸内直喷汽油机排放PM2.5的理化特征及影响因素[J]. 中国环境科学, 2016, 36(5): 1332-1339.
QIN Yan-hong, HU Min, LI Meng-ren, WANG Yin-hui, PENG Jian-fei, ZHENG Rong, ZHENG Jing, WANG Yu-jue, WU Yu-sheng, WANG Yu, GU Fang-ting, DU Zhuo-fei, SHUAI Shi-jin. Physical and chemical characteristics of PM2.5 emissions from gasoline direct injection engine and its influence factors. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(5): 1332-1339.
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