为研究料层孔隙率对高炉炉身内部传热与传质过程的影响,分别对料层孔隙率为常数、随化学反应程度变化两种条件下的高炉炉身传热与传质过程进行了数值模拟,料层结构由自编程的料层分布程序计算而得,炉腰下部入口处的气流速度、温度以及组分质量分数等数据取自于回旋区喷煤过程的数值模拟结果.数值模拟结果表明,两种模型下炉身内部压差分布、煤气速度分布、气固两相温度分布、CO和CO2质量分数分布态势相同,但具体数值存在不同程度的差异,非定常孔隙率模型的预测结果与现场检测结果更为吻合,定常孔隙率模型对炉身压差的预测结果与生产实践数据的相对误差较大,因此采用非定常料层孔隙率有利于提高高炉炉身传热传质过程数值模拟精度.“,”Heat and mass transfer processes in the blast furnace shaft have been simulated with fixed and changeable burden porosity distributions separately.Changeable porosity in the present study is calculated according to the burden composition,which varies with the extent of ore reduction.Additionally,the burden structure and the inlet gas boundary conditions which include temperature,velocity and species distributions,were obtained by burden distribution model and numerical simulation of injected pulverized coal combustion in the lower part of blast furnace respectively.In this study,distributions of pressure drop,gas velocity,gas-solid temperature and mass fractions of CO and CO2 are obtained with two kinds of porosity distributions,and compared with measured data.It is found that the results which predicted by changeable porosity model are more consistent with the measured results.Using the changeable porosity model,which varies with the burden composition,is beneficial to improve the accuracy of numerical simulation.