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在高炉多区域热质平衡数学模型基础之上建立了高炉富氧喷吹煤粉经济评价模型,并利用模型计算了高炉富氧喷煤之后高炉相关操作参数和吨铁冶炼成本的变化。结果表明,增加富氧率提高喷煤比可以有效降低吨铁冶炼成本,降低成本的幅度主要取决于煤粉和焦炭之间价格差别(煤焦差价)和氧气单价,煤焦差价越高、氧气单价越低,吨铁成本降低幅度越大,对应的最佳富氧率水平越高,在目前的原燃料成本条件下,降低成本的最佳富氧率可以达到15%~18%。此外,该模型还可够应用于不同高炉流程冶炼生铁的经济效益评价,为探索低成本炼铁方法提供支持。
Based on the mathematical model of multi-zone heat and mass balance in blast furnace, an economic evaluation model of oxygen-rich blast furnace pulverized coal was established and the model was used to calculate the relevant operation parameters of BF and the cost of smelting iron after blast furnace oxygen-rich coal injection. The results show that increasing the oxygen enrichment rate and increasing the coal injection ratio can effectively reduce the cost of the iron and steel smelting and the cost reduction rate is mainly determined by the price difference between coal and coke (coal coke price) and the unit price of oxygen. The higher the coal coke price, The lower the unit price, the greater the reduction in the cost per ton of iron, the higher the corresponding optimal oxygen enrichment rate. Under the current raw fuel cost conditions, the optimal oxygen enrichment rate for reducing costs can reach 15% to 18%. In addition, the model can also be applied to evaluate the economic benefits of pig iron smelting in different blast furnace processes and provide support for exploring low-cost iron smelting methods.