高炉冶炼预还原炉料能耗分析

Energy Consumption Analysis on Blast Furnace Ironmaking Process Using Pre-Reduced Burden

通过建立高炉冶炼预还原炉料数学模型,计算了原料铁品位、预还原炉料金属化率和铁的存在形态对高炉冶炼能耗的影响,比较了高炉冶炼预还原炉料和传统高炉的能耗。计算结果表明:针对不同铁品位原料,有一个适合高炉冶炼的炉料最佳金属化率,使高炉冶炼焦比最低;预还原炉料中的铁以硅酸铁形式存在时,主要进行直接还原,冶炼焦比较高;与传统高炉相比,高炉冶炼预还原炉料,可以大幅度降低焦比,但燃料比升高。

Mathematical model of blast furnace ironmaking process using pre-reduced burden was established. The iron grade of raw material, metallization rate of pre-reduced iron ore and combined form of iron effect on energy consumption of blast furnace was calculated. Energy consumption of blast furnace ironmaking using pre-reduced burden between traditional blast furnace was compared. The results show that according to different iron grade of raw material, there is a suitable metallization rate of pre-reduced burden, make the lowest coke ratio of blast furnace smelting. If the iron in the pre-reduced burden is in the form of iron silicate, the blast furnace coke ratio is high because iron silicate direct reduction is strongly endothermic reaction. Blast furnace ironmaking process using pre-reduced burden can greatly reduce coke ratio, but increase fuel consumption.