煤焦化过程苯系物的排放特征及稳定碳同位素组成

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Abstract Emission characteristics and stable carbon isotopic (δ¹³C) composition of BTEX emitted from different production processes in a typical coal coke plant were measured, and the total BTEX emissions during the coke production in China were estimated. The total emission factor (EF) of BTEX from coal coking process was 16655mg/t coke, among which the EF from coke oven flue gas was the highest (7167mg/t), followed by the flue gases from coke pushing (6454and 1825mg/t), sewage treatment (1096mg/t) and chemical byproduct recovery (112.7mg/t). The total emissions of BTEX from the coking in 2020 were 7844 tons in China, and Shanxi (22.27%), Shaanxi (10.39%), Hebei (10.24%) and Inner Mongolia (8.96%) made higher contributions. Benzene was the most abundant compound, accounting for 86.12% of the total BTEX, followed by Toluene (11.45%); and δ¹³C of BTEX from coal coking ranged from -27.10‰ to -32.58‰. There was no significant difference in the carbon isotope composition of BTEX emissions from different processes during the coal coke production, and the unique B/T (Benzene/ Toluene) ratio and δ¹³C value of benzene imply that it could be a good marker for distinguishing coking emissions from other sources in the ambient air.

Key words： coal coke production Shanxi BTEX stable carbon isotope

Received: 11 October 2022

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X531

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	MU Ling
	FENG Chuan-yang
	LI Yang-yong
	LI Xiao-fan
	LIU Tian
	LIU Zi-ye
	JIANG Xin

Cite this article:

MU Ling,FENG Chuan-yang,LI Yang-yong等. Emission characteristics and stable carbon isotope composition of BTEX in coal coking process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2806-2813.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/2806

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