废漆包线热解烟气二噁英排放特性与减排机理

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Abstract This paper analyzed generation and emission characteristics of dioxins in the flue gas of a 2t/furnace intermittent pyrolysis furnace were analyzed, and a dioxin control technology based on "process inhibition and terminal reduction" was proposed. The effects of adding inhibitors to the pyrolysis process of scrap copper enameled wire in combination with terminal activated carbon adsorption on the emission of dioxins and their congeners were investigated. The results showed that the emission concentration of PCDD/Fs in the pyrolysis furnace flue gas was 54.32ng/Nm³, and the I-TEQ value was 5.30ng I-TEQ/Nm³. The congeners of PCDF were mostly 1234678-HpCDF and OCDF, and the congeners of PCDD were mostly 1234678-HpCDD and OCDD. By applying the technology of "process inhibition and the terminal reduction", the composite inhibitor can reduce the catalytic activity of copper metal and its compounds, lower the concentration of Cl₂, and inhibit the de novo synthesis reaction, while the reactive radicals formed during the decomposition of the composite inhibitor can prevent the formation of PCDD/Fs or attack the molecular bonds of PCDD/Fs, thus inhibiting the formation of dioxins. Combined with the physical adsorption of the terminal activated carbon, the dioxin emission concentration in the pyrolysis furnace flue gas was reduced to 1.10ng/Nm³ and the I-TEQ value was reduced to 0.08ng I-TEQ/Nm³, which meets the national environmental protection standard.

Key words： scrap copper enameled wire pyrolysis dioxins compound inhibitors activated carbon emission reduction

Received: 07 April 2023

PACS:	X511
	X705

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	Articles by authors
	FAN Chun-long
	QIAN Li-xin
	DING Long
	SHEN Tao
	YAO Ming
	CHUN Tie-jun
	HAN Yi-jiao
	LONG Hong-ming

Cite this article:

FAN Chun-long,QIAN Li-xin,DING Long等. Emission characteristics and abatement mechanism of dioxins in the pyrolysis flue gas of scrap copper enameled wire[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5855-5862.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I11/5855

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