中文摘要：

针对单个球团未反应核模型在研究多球反应体系中存在的局限性，首先基于单球团未反应核动力学模型，构建了等温固定床中多球体系下球团矿还原模型；然后通过引入无因次变量，得到方程的解析解，并且采用特征线法进行求解得到了方程的数值解；最后在中温管式炉中设计了等温固定床球团矿还原试验．实验结果与模型计算值有较好的吻合．

英文摘要：

For the limitation of the single-pellet unreacted shrinking core model in studying a multi-pellet system, a mathematical model of iron oxide pellet reduction in an isothermal fixed bed was constructed based on the reduction behavior of single pellets. The analytical solution of the model was obtained by introducing dimensionless variables, and the characteristic line method was used for numerical analysis. At last the reduction experiments of the fixed bed consisted of multiple pellets were performed in a middle temperature tube furnace and the predicted results by the model agreed well with the measured ones by experiment.