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根据承钢高炉冶炼条件,以其高炉喷吹煤粉作为试验原料,利用煤粉燃烧炉模拟现场高炉风口区域煤粉的燃烧过程,探讨加入含钛炉渣稀释剂CaF_2和MgO后,对煤粉燃烧性能的影响,并结合扫描电镜(SEM)观察未燃煤粉颗粒表面结构的变化。试验结果表明,煤粉中添加CaF_2后燃烧率有所提高,但提高幅度不大,SEM图未燃煤粉的颗粒减小,这说明CaF_2对高炉内煤粉的燃烧有一定的促进作用;添加MgO后煤粉燃烧率明显提高,当添加MgO质量分数为1.20%时,煤粉燃烧率提高了12.41%,此时未燃煤粉SEM图平均粒径为4.30μm,比未加入稀释剂未燃煤粉的粒径小5.48μm,并且组织颗粒的大小及分布比较均匀,综合考虑炉渣稀释剂MgO对承钢含钛炉渣的稀释作用和对高炉内煤粉燃烧的影响,含钛炉渣稀释剂MgO的最佳添加质量分数为1.20%。
According to the smelting conditions of Chengde blast furnace, pulverized coal was injected into the blast furnace to test the combustion process of pulverized coal in the blast furnace tuyere area by using pulverized coal combustion furnace. After the addition of titanium-containing slag diluent CaF_2 and MgO, And the change of the surface structure of unburned pulverized coal particles was observed by scanning electron microscopy (SEM). The results showed that the combustion rate increased with the addition of CaF 2 in the pulverized coal, but the increase rate was not large and the unburned pulverized coal particles in the SEM diagram decreased. This indicated that CaF 2 could promote the pulverized coal combustion in the blast furnace. When the mass fraction of MgO is 1.20%, the combustion rate of pulverized coal increases by 12.41%. At this time, the mean SEM particle size of unburned pulverized coal is 4.30μm, which is higher than that of unburned pulverized coal without burning Pulverized coal particle size of 5.48μm, and the size and distribution of tissue particles more evenly, considering the slag diluent MgO on titanium bearing slag dilution effect and the impact of pulverized coal combustion in the blast furnace, slag containing titanium oxide MgO The best addition of mass fraction of 1.20%.