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根据气相和固相的质量和能量守恒方程,建立Midrex还原竖炉反应的一维数学模型。含铁原料的还原采用逐级的单界面未反应核模型,并考虑了热量损失,得到了各物质的浓度和温度的变化曲线。模型模拟结果与Gilmore厂生产数据相符,验证了模型的准确性。模拟结果显示,竖炉的绝大部分区域内气相和固相的温度基本一致。在竖炉1.18 m深以上发生的反应为放热反应,反之为吸热反应。模型又模拟了不同的还原气入口温度、气体流量、产铁量和球团半径条件下的结果,为Midrex还原竖炉的生产提供参考。
According to the mass and energy conservation equations of gas phase and solid phase, a one-dimensional mathematical model of the reaction of the Midrex reduction shaft was established. The reduction of iron-containing raw materials using step by step single-interface unreacted nuclear model, and taking into account the loss of heat, obtained the concentration of various substances and temperature curve. The model simulation results are in line with the Gilmore plant production data, which verifies the accuracy of the model. The simulation results show that the temperature of the gas phase and the solid phase in most of the shaft furnace are basically the same. In the shaft furnace 1.18 m deep reaction occurred above the exothermic reaction, on the contrary is endothermic reaction. The model also simulates the results of different reducing gas inlet temperature, gas flow rate, iron production and pellet radius for the Midrex reduction shaft furnace production reference.