Emission characteristics and abatement mechanism of dioxins in the pyrolysis flue gas of scrap copper enameled wire
FAN Chun-long1, QIAN Li-xin1, DING Long1, SHEN Tao2, YAO Ming1, CHUN Tie-jun1, HAN Yi-jiao2, LONG Hong-ming1,3
1. School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China; 2. Tongling Zhuoxiang Copper Material Technology Co. Ltd., Tongling 244100, China; 3. Key Laboratory of Metallurgical Emission Reduction & Resource Utilization, Ministry of Education, Maanshan 243002, China
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.
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FAN Chun-long, QIAN Li-xin, DING Long, SHEN Tao, YAO Ming, CHUN Tie-jun, HAN Yi-jiao, LONG Hong-ming. Emission characteristics and abatement mechanism of dioxins in the pyrolysis flue gas of scrap copper enameled wire. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5855-5862.
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