In this paper, the gas-solid flow process in the blast furnace raceway is numerically simulated using coupled computational fluid dynamics and discrete element method (CFD-DEM). The coke reaction kinetics data are imported into the DEM model to reproduce the consumption process of each coke particle. The effects of inlet gas velocity and angle on the morphology of the raceway, coke consumption rate, coke bed temperature, and particle size distribution in the blast process are systematically investigated and analyzed. The results show that the consumption of coke particles promotes the formation of raceway during the blast process. At the same time, a coke mixture layer is produced at the edge of the raceway. The higher the inlet gas velocity, the thicker the coke mixture layer in the middle and upper part of the raceway region, and the larger the proportion of small particles in the coke mixture layer. The effect of inlet gas angle on the raceway region is less than the inlet gas velocity. However, with the increase of the inlet gas angle, the high temperature region of the coke bed extends downward gradually, which is conducive to activating the hearth.

本文采用计算流体力学与离散元耦合法（CFD-DEM）对高炉滚道内的气固流动过程进行数值模拟。将焦炭反应动力学数据导入DEM模型中，重现每个焦炭颗粒的消耗过程。系统研究分析了鼓风过程中入口气体速度和角度对滚道形态、焦炭消耗率、焦炭床温度和粒度分布的影响。结果表明，焦炭颗粒的消耗促进了鼓风过程中滚道的形成。同时，在滚道边缘产生焦炭混合物层。入口气速越高，滚道区域中上部的焦炭混合物层越厚，焦炭混合物层中小颗粒的比例越大。入口气体角度对滚道区域的影响小于入口气体速度。但随着进气角度的增大，焦床高温区逐渐向下延伸，有利于炉床活化。