Midrex还原竖炉反应的数值模拟

A Preliminary Numerical Simulation of Midrex Reduction Shaft Furnace

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。

Based on the mass and energy balance of gas and solid phases, a one-dimensional model of Midrex reduction process was developed. The model was able to satisfactorily reproduce the data from Gilmore Steel Corporated. Calculated results showed that, the temperature difference between solid and gas phases is small in the most part of reduction section of Midrex shaft furnace. The reactions are exothermal in the upper part of 1.18 meter in depth. The performance of the reactor was also analyzed under different temperature of reduction gas,gas flow rate, size of iron ore pellet and productivity of the reactor.