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以BL竖炉及工艺参数为计算依据,建立气固传热模型,采用计算流体软件Fluent模拟计算。将球团矿简化为多孔介质,物料的运动采用滑移网格模拟,还原反应采用三步反应参与计算,得到氢气直接还原铁竖炉还原段的温度场,并计算还原气的热效率。结果表明:在一定范围内,随着氢气气量的增加还原段温度梯度逐渐变窄,炉顶气温度逐渐升高,并且还原气的热效率逐渐降低。同时也能够得出还原产物随高度的变化情况。简化的竖炉还原段气固传热模型适用于氢气直接还原竖炉还原段温度场的预测以及炉内反应产物的分析。
Based on the BL shaft furnace and the process parameters, the gas-solid heat transfer model was established and the computational fluid software Fluent was used to simulate the calculation. The pellets were simplified as porous media. The movement of material was simulated by slip grid. The three-step reaction was used to calculate the reduction reaction. The temperature field of hydrogen reduction section was obtained and the thermal efficiency of reducing gas was calculated. The results show that within a certain range, as the hydrogen gas increases, the temperature gradient in the reduction section becomes narrower, the temperature of the top gas gradually increases, and the thermal efficiency of the reducing gas decreases gradually. At the same time, it is also possible to deduce the change of the reduction product with the height. The simplified vertical furnace reduction section gas-solid heat transfer model is suitable for the prediction of the temperature field in the reduction section of the direct reduction hydrogen furnace and the analysis of the reaction products in the furnace.