论文部分内容阅读
国内某钢厂一座高炉现阶段喷煤量为160 kg左右,对其使用晨旭煤做喷吹煤时和正赫煤做喷吹煤时的2个阶段的高炉除尘灰(重力除尘灰和布袋除尘灰)进行了研究。高炉的重力灰和布袋灰的粒度组成和分布表明:重力灰中粒径主要集中在10~110μm,小于110μm颗粒占96%左右,大于74μm,小于297μm的颗粒约占60%;布袋灰的粒度分布图大致集中在3~30μm,小于20μm颗粒占到80%以上。通过岩相显微分析得到了重力灰和布袋灰中的各显微组分的面积分数,并根据除尘灰中未燃煤粉和焦粉的消耗程度,结合化学分析和岩相显微分析结果计算,得到了该高炉喷吹不同煤种时除尘灰中未燃煤粉所占的百分比。最后,初步得出喷吹不同煤种对高炉除尘灰中未燃煤粉质量分数的影响,即与晨旭煤相比,正赫煤的反应性和燃烧性都较好,喷吹期间,炉尘中产生的未燃煤粉较少,煤粉利用率较高。同时也表明,实验室热重法测得的燃烧性和反应性可以作为评价煤粉最终利用率的2个重要参数,为钢厂实际生产中的喷煤评价和煤种选择提供了可靠的新方法。
A blast furnace in a steelmaking plant in China now has an amount of about 160 kg of coal injected, which is characterized by two stages of blast furnace dust removal (gravity dust removal and bag dust removal) when using Chenxu coal for coal injection and Zhenghe coal injection coal, Gray) were studied. The particle size distribution and distribution of gravity ash and bag ash in blast furnace indicate that the particle size of gravitation ash is mainly concentrated in 10 ~ 110μm, the particles smaller than 110μm account for about 96%, the particles larger than 74μm and smaller than 297μm account for about 60% Distribution is generally concentrated in the 3 ~ 30μm, less than 20μm particles accounted for more than 80%. According to the analysis of lithofacies, the area fraction of each micro-component in gravitation ash and bagging ash was obtained. Based on the degree of consumption of unburnt coal and coke powder in the dust, combined with chemical analysis and petrographic analysis The percentage of unburned pulverized coal in the dust was obtained when the blast furnace fired different coal types. Finally, the preliminary conclusion is drawn that the influence of different coal injection on the mass fraction of unburned coal dust in blast furnace dust, that is, compared with morning Xu coal, the positive coal has good reactivity and combustibility. During the blasting, Dust generated less coal unburned, higher utilization of coal. It also shows that the combustibility and reactivity measured by thermogravimetry in laboratory can be used as two important parameters to evaluate the final utilization rate of pulverized coal and provide a reliable new test for pulverized coal evaluation and coal selection in the actual production of steel mills method.