Effect of Mg-additive and carrier gas in flue gas torrefaction and gasification: Fuel properties, kinetics and thermodynamic analysis

Xiaochao Zhu, Xiyue Sun, Beibei Yan, Donghao Hou, Songjiang Li, Shengquan Zhou and Guanyi Chen

Energy, 2025, vol. 328, issue C

Abstract: Flue gas torrefaction (FGT) integrated with gasification based on Mg-additive (MgO-FGT-GS) is a promising biomass utilization approach. This study examined the influence of torrefaction atmosphere on the physicochemical characteristics, gasification products release, the kinetics and thermodynamics. MgO-FGT products exhibited the highest H/C ratio of 1.46. The HHV and energy density of torrefied products is 19.15 MJ/kg and 1.22. The optimum amount of O2 and the maximum amount of CO2 are the best for the improvement of fuel properties. Additionally, adjusting the flue gas composition controlled the composition of gasification products. The synergistic effect of FGT coupled with MgO enhances the release of combustible gas in the gasification stage. Kinetic and thermodynamic analyses indicated that torrefaction enhanced raw stability by eliminating hemicellulose. The destruction of cellulose by torrefaction improved gasification reactivity, and the Mg-additive catalysis of cellulose further improved reactivity. Higher O2 and lower CO2 content in flue gas exacerbated cellulose and hemicellulose destruction, detrimental to torrefaction. Overall, this research provides theoretical support for industrial applications of MgO-FGT-GS.

Keywords: Flue gas torrefaction; Gasification; Kinetic; Thermodynamic (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:328:y:2025:i:c:s0360544225021371

DOI: 10.1016/j.energy.2025.136495

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