根据流化床内褐铁矿粉实际还原焙烧情况,建立了微空间尺度下气固还原反应的动力学模型,包括颗粒内非稳态的传热方程、孔隙内气体传输方程和基于描述孔径分布的改进随机孔模型的非均相化学反应动力学方程,采用全隐式有限体积法对控制方程进行数值求解.结果表明,模型预测结果与实验结果吻合较好.温度提高50 K,还原所需时间可缩短36%,褐铁矿焙烧反应速率与还原气体CO浓度近似成正比.磁化焙烧温度为870 K及CO浓度为2.624mol/m3时焙烧时间可缩短至60 s. Based on the actual reduction calcination of limonite in the fluidized bed, a kinetic model of gas-solid reduction reaction at micro-spatial scale was established, including the non-steady-state heat transfer equation in the particle, the gas transport equation in the pore and the pore- , The governing equation is solved numerically by the method of all implicit finite volume method.The results show that the model predictions agree well with the experimental results.When the temperature is increased by 50 K, The time can be shortened by 36%, and the reaction rate of limonite is approximately proportional to the CO concentration of the reducing gas, and the roasting time can be shortened to 60 s when the magnetization roasting temperature is 870 K and the CO concentration is 2.624 mol / m3.