Characteristics of Qingxu coal applied in the 4 350 m^3 blast furnace of Taigang
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摘要: 對太鋼現在使用的廉價清徐煤基礎性能進行系統研究,探討高爐噴吹清徐煤替代高平無煙煤及璐安貧瘦煤的可行性.通過對清徐煤的12種性能的檢測,得出清徐煤具有以下特點:燃燒性及反應性強,發熱值及灰熔融特性溫度、流動性好,無爆炸性;但含硫較高,洗煤含鋅低,未洗煤含鋅高.通過混煤完全可以達到高爐噴吹的標準.應用FactSage軟件解析配入過高的清徐煤容易風口結渣的原因,并提出相應的建議.實驗室研究及現場的結果認為,清徐煤可通過混煤的方式噴入高爐中,但不易配比過高,替代無煙煤貧瘦煤比例不易超過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%.
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Key words:
- blast furnaces /
- pulverized coal /
- combustion /
- reactivity /
- slagging
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