大喷煤条件下鞍钢高炉喷吹煤粉的炉内利用率

为了探究目前大喷煤条件下煤粉喷入高炉后在炉内的利用情况，对鞍钢高炉除尘灰进行收集、取样和测试；同时采用岩相分析手段观察分析高炉炉尘中未燃煤粉、焦炭和矿物质灰渣的组成及微观形貌，定量计算出除尘灰中不同含碳物质的质量分数。结果表明，整体来看，鞍钢4座3 200 m³级别的大高炉喷吹煤粉在炉内的利用率要低于其余4座小高炉，说明高炉在提高煤比的同时，还需重点关注煤粉的燃尽率。通过调节各项操作参数来提高煤粉在高炉内的利用率，可节约生产成本并保证高炉的顺行稳产。

Utilization rate of coal injection for blast furnace in Ansteel under the large injection condition

In order to explore the utilization of pulverized coal under current large-scale coal injection conditions, the dust collection,sampling and test was carried out for Ansteel blast furnace. Through laboratory testing, the carbon mass fraction of different substances in dust were tested and calculated quantitatively and the unburned pulverized coal, coke, mineral composition and microstructure of dust were analyzed by petrographic analysis methods. The results show that the utilization rate of pulverized coal of four 3 200 m3 blast furnaces are lower than that of the other four blast furnaces in Ansteel, indicating that coal burnout rate should be paid more attention while increasing the coal ratio. By adjusting the operation parameters, the utilization rate of pulverized coal can be improved, production cost can be saved and stable production of blast furnace can be guaranteed.