Revealing the Mechanism of Dioxin Formation from Municipal Solid Waste Gasification in a Reducing Atmosphere

Jianye Bei; Xu Xu; Mingxiu Zhan

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Revealing the Mechanism of Dioxin Formation from Municipal Solid Waste Gasification in a Reducing Atmosphere

机译：Revealing the Mechanism of Dioxin Formation from Municipal Solid Waste Gasification in a Reducing Atmosphere

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Gasification is an effective technology for the thermal disposal of municipal solid waste(MSW)with lower dioxin emission compared to the prevailing incineration process.Nevertheless,the mechanism of dioxin formation in the reducing atmosphere during the gasification process was seldomly explored.Herein,the effects of the atmosphere,temperature,and chlorine source were systematically investigated in terms of dioxin distribution.With CO2 and H2O as gasification agents,a reducing reaction atmosphere was formed with abundant H2 which effectively suppressed the generation of C-Cl,contributing to a substantial decrease of dioxin concentration by ~80% compared to the incineration process.The formation of dioxin was favored at temperatures below 700 ℃ with its peak concentration achieved at 500 ℃.It was unveiled that inorganic chlorine played a dominant role in the reducing atmosphere,with a lower proportion of C-O-C/O-C=O on residual slag compared to an oxidizing atmosphere.Additionally,the generated H2 reduced the concentration of dioxins by attacking C-Cl and inhibiting the crucial Deacon reaction for dioxin formation,validated by density functional theory calculation.Eventually,the formation route paradigm and the reaction mechanism of dioxin formation from MSW gasification were revealed,facilitating and rationally guiding the control of dioxin emission.

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来源
《Environmental Science & Technology: ES&T》 |2022年第20期|14539-14549|共11页
作者
Jianye Bei; Xu Xu; Mingxiu Zhan;
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作者单位

College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018 Zhejiang,China;

State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;

College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018 Zhejiang,China;

College of Metrology and Measurement Engineering China Jiliang University,Hangzhou 310018 Zhejiang,China;

State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
gasification; dioxins; reducing atmosphere; formation mechanism; DFT calculation;

Revealing the Mechanism of Dioxin Formation from Municipal Solid Waste Gasification in a Reducing Atmosphere

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