太钢4350m3高炉喷吹清徐煤特性
Characteristics of Qingxu coal applied in the 4 350 m^3 blast furnace of Taigang
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摘要: 对太钢现在使用的廉价清徐煤基础性能进行系统研究,探讨高炉喷吹清徐煤替代高平无烟煤及璐安贫瘦煤的可行性.通过对清徐煤的12种性能的检测,得出清徐煤具有以下特点:燃烧性及反应性强,发热值及灰熔融特性温度、流动性好,无爆炸性;但含硫较高,洗煤含锌低,未洗煤含锌高.通过混煤完全可以达到高炉喷吹的标准.应用FactSage软件解析配入过高的清徐煤容易风口结渣的原因,并提出相应的建议.实验室研究及现场的结果认为,清徐煤可通过混煤的方式喷入高炉中,但不易配比过高,替代无烟煤贫瘦煤比例不易超过20%.Abstract: The characteristics of cheaper Qingxu coal were investigated in Taigang of China. It was discussed that Gaoping anthracite and Lu'an lean coal are replaced by cheaper Qingxu coal. Twelve performance tests of Qingxu coal were carried out. The results show that Qingxu coal has such virtues as a better combustion property and reactivity, a higher heat value and ash fusibility, good fluid-ly and non-explosiveness at the same time. Conversely the S content is higher in Qingxu coal, and the Zn content is lower in the washed Qingxu coal but higher in the unwashed Qingxu coal. The blast furnace injection standard can be achieved by mixing the coal. The analysis of FactSage software illustrates the reason that the tuyeres are jammed by slagging when Qingxu coal is used excessively. Laboratory studies and field results show that Qingxu coal can be injected into the blast furnace by coal blending, but the substitution rate of Qingxu coaI should be to less than 20%.