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.

研究了非等温蒸汽气化过程中煤焦的气化反应性和动力学参数。以一种褐煤和三种烟煤为样本，其煤等级按升序排列：XB <KL <ZJ <GD。通过综合气化指标表征，煤焦的气化反应性按降序排列：XB> KL> ZJ> GD。通过系统地分析影响气化反应性的因素，可以确定气化反应性主要由碳质结构决定。气化反应性与煤等级成反比，并且煤等级越高，气化反应性越低。提出了一个新的动力学模型来计算动力学参数，其中反应顺序被认为是未知的动力学参数。反应顺序n遵循升序：XB <KL <ZJ <GD，分别为n  = 1.00，n  = 1.34，n  = 1.83和n  = 2.63。证明了反应级数与煤级成正比，煤级越高，反应级数越高。