Abstract
The gasification reactivity and kinetic parameters of coal chars for non-isothermal steam gasification were investigated. One kind of lignite and three kinds of bituminous coals were used as the samples, and their coal ranks follow the ascending order: XB < KL < ZJ < GD. As characterized by the comprehensive gasification index, the gasification reactivity of coal chars follows the descending order: XB > KL > ZJ > GD. Through systematically analyzing factors affecting gasification reactivity, it was ascertained that the gasification reactivity is mostly determined by the carbonaceous structure. The gasification reactivity is inversely proportional to the coal rank, and the higher the coal rank, the lower the gasification reactivity. A new kinetic model was proposed to calculate the kinetic parameters, in which the reaction order was considered as an unknown kinetic parameter. The reaction order n follows the ascending order: XB < KL < ZJ < GD, which are n = 1.00, n = 1.34, n = 1.83, and n = 2.63, respectively. It is proved that the reaction order is proportional to the coal rank, and the higher the coal rank, the higher the reaction order.
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The present work was supported by the National Natural Science Foundation of China (U1960205 and 51574023).
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Wang, Yj., Zuo, Hb., Zhao, J. et al. Gasification reactivity and kinetic parameters of coal chars for non-isothermal steam gasification. J. Iron Steel Res. Int. 28, 1–9 (2021). https://doi.org/10.1007/s42243-020-00463-4
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DOI: https://doi.org/10.1007/s42243-020-00463-4