摘要
分析了工业现场2t/炉的间歇式热解炉烟气中二噁英的生成及排放特性,提出了基于“过程抑制+末端减排”的二噁英控制技术.研究了在废铜漆包线热解过程添加抑制剂,并结合末端活性炭吸附对二噁英及其同系物排放的影响.结果表明,热解炉烟气中PCDD/Fs的排放浓度为54.32ng/Nm^(3),I-TEQ值为5.30ng I-TEQ/Nm^(3).PCDF的同系物主要为1234678-HpCDF和OCDF;PCDD的同系物主要为1234678-HpCDD和OCDD.应用“过程抑制+末端减排”的技术后,复合抑制剂能够减弱金属铜及其化合物的催化活性,降低Cl_(2)的浓度,抑制从头合成反应,复合抑制剂分解过程形成的活性自由基会阻碍PCDD/Fs的形成或攻击PCDD/Fs的分子键,抑制二噁英生成,结合末端活性炭的物理吸附,使热解炉烟气中二噁英的排放浓度降低至1.10ng/Nm^(3),I-TEQ值降低至0.08ng I-TEQ/Nm^(3),达到国家环保标准.
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/Nm^(3),and the I-TEQ value was 5.30ng I-TEQ/Nm^(3).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 Cl_(2),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/Nm^(3) and the I-TEQ value was reduced to 0.08ng I-TEQ/Nm^(3),which meets the national environmental protection standard.
作者
范春龙
钱立新
丁龙
沈涛
姚铭
春铁军
韩艺娇
龙红明
FAN Chun-long;QIAN Li-xin;DINg Long;SHEN TaO;YAO Ming;CHUN Tie-jun;HAN Yi-jiao;LONG Hong-ming(School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243002,China;Tongling Zhuoxiang Copper Material Technology Co.Ltd.,Tongling 244100,China;Key Laboratory of Metallurgical Emission Reduction&Resource Utilization,Ministry of Education,Maanshan 243002,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2023年第11期5855-5862,共8页
China Environmental Science
基金
国家重点研发计划项目(2021YFC1910501)。
关键词
废铜漆包线
热解
二噁英
复合抑制剂
活性炭
减排
scrap copper enameled wire
pyrolysis
dioxins
compound inhibitors
activated carbon
emission reduction
