Investigation of gasification kinetics of multi-component waste mixtures in a novel thermogravimetric flow reactor via gas analysis

Mărculescu, Cosmin; Tirtea, Raluca Nicoleta; Khachatryan, Lavrent; Boldor, Dorin

doi:10.1016/j.biortech.2021.126044

Cited by 6 publications

(1 citation statement)

References 28 publications

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“…The presence of H 2 O promoted the water–gas reaction and the water-steam reforming reaction (T1 and T2) and effectively increased the H 2 content in the MSW thermal treatment process, and a rich hydrogen environment would inhibit the generation of dioxin validated by a substantial reduction of dioxin production in the gas phase. The following chemical reaction equations are involved in the MSW gasification process − …”

Section: Resultsmentioning

confidence: 99%

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

Bei

Zhan

et al. 2022

Environ. Sci. Technol.

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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 °C with its peak concentration achieved at 500 °C. 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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