Effect of Atmosphere on HCl Releasement during MSWI Fly Ash Thermal Treatment

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  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China

网络出版日期: 2023-11-26

基金资助

This work was financially supported by the National Natural Science Foundation of China (U1810127) and the Youth Innovation Promotion Association, Chinese Academy of Science (Y201932).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Effect of Atmosphere on HCl Releasement during MSWI Fly Ash Thermal Treatment

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  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China

Online published: 2023-11-26

Supported by

This work was financially supported by the National Natural Science Foundation of China (U1810127) and the Youth Innovation Promotion Association, Chinese Academy of Science (Y201932).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

城市固体废弃物焚烧(MSWI)飞灰中含有重金属和二恶英,因而属于危险废弃物。熔融处置可以稳定其中的重金属和二恶英,具有广阔的应用前景。但是,MSWI飞灰在热处理过程中污染物HCl的释放存在潜在的环境风险,这对MSWI飞灰的热处理制度的选择至关重要。本文揭示了不同气氛下MSWI飞灰热处理过程中HCl的形成途径。结果表明:飞灰中的CaOHCl在550℃以下首先分解为CaCl2、CaO和H2O,为HCl的生成提供了H;然后, CaCl2、NaCl或KCl与H2O反应释放出HCl,在此过程中H2O和O2促进HCl的生成,CO抑制HCl的生成。HCl生成的初始温度受气氛中H2O浓度的影响。当温度达到1250℃时,NaCl和KCl几乎全部挥发,以HCl为主的由含氯矿物在N2、CO和空气气氛中与H2O 反应生成Ca19.2Mg2.8(Si0.75Al0.75)8O36Cl2, Ca4(SiO4)(SO4)Cl2 and Ca10(SiO4)3Cl2。此外,在还原气氛中,金属易被HCl氯化,进一步消耗了HCl。对HCl释放的抑制能力为:CO>N2>Air>>H2O。

本文引用格式

YANG Guiyun, REN Qiangqiang, ZHOU Li, XU Jing, LYU Qinggang . Effect of Atmosphere on HCl Releasement during MSWI Fly Ash Thermal Treatment[J]. 热科学学报, 2023 , 32(6) : 2243 -2255 . DOI: 10.1007/s11630-023-1789-8

Abstract

Municipal solid waste incineration (MSWI) fly ash constitutes a hazardous waste. Melting disposal has been verified to be prospective for stabilizing heavy metals and dioxins. Release of contaminant HCl during MSWI fly ash thermal treatment leads to potential environmental risks. The behavior and transformation of chlorine are critical to the disposal strategy of MSWI fly ash. In this study, the pathway of HCl formation in MSWI fly ash thermal treatment under complex atmosphere was revealed. Results show that CaOHCl in fly ash was first decomposed to CaCl2, CaO and H2O below 550°C, which provides H for HCl generation. Then, CaCl2, NaCl or KCl were reacted with H2O to release HCl, during which process H2O and O2 promote HCl formation, CO inhibit HCl production since H2O is consumed in water-gas reaction. The initial temperature of HCl generation affected by the concentration of H2O in the atmosphere. When temperature up to 1250°C, almost all NaCl or KCl were volatilized, HCl mainly from the reaction of chlorine-containing minerals with H2O, such as Ca19.2Mg2.8(Si0.75Al0.75)8O36Cl2, Ca4(SiO4)(SO4)Cl2 and Ca10(SiO4)3Cl2 in N2, CO and air atmosphere separately. Moreover, in a reducing atmosphere, metals are more easily chlorinated by HCl, resulting in further consumption of HCl. The order of atmosphere for reducing HCl emissions should be CO>N2>Air>>H2O.

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