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

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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)8 O36Cl2, 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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Acknowledgment

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).

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Authors and Affiliations

  1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China

    Guiyun Yang, Qiangqiang Ren, Li Zhou, Jing Xu & Qinggang Lyu

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Guiyun Yang, Qiangqiang Ren, Li Zhou, Jing Xu & Qinggang Lyu

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  1. Guiyun Yang
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  2. Qiangqiang Ren
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Correspondence to Qiangqiang Ren.

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Yang, G., Ren, Q., Zhou, L. et al. Effect of Atmosphere on HCl Releasement during MSWI Fly Ash Thermal Treatment. J. Therm. Sci. 32, 2243–2255 (2023). https://doi.org/10.1007/s11630-023-1789-8

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  • DOI: https://doi.org/10.1007/s11630-023-1789-8

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