缸内直喷汽油机排放PM<sub>2.5</sub>的理化特征及影响因素

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Abstract

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.

Key words： gasoline direct injection engine PM_2.5 chemical composition emission characterization size distribution

Received: 15 October 2015

PACS:

X513

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	Articles by authors
	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

Cite this article:

QIN Yan-hong,HU Min,LI Meng-ren等. Physical and chemical characteristics of PM_2.5 emissions from gasoline direct injection engine and its influence factors[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(5): 1332-1339.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I5/1332

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