摘要:
采用邯郸钢铁公司的两种高炉喷吹用煤(烟煤JM,无烟煤FD)为原料,进行不同预热温度后煤粉的差热分析及燃烧率的测定。结果表明,两种煤的失重开始温度相差不大,均为50℃左右,失重结束温度呈下降趋势。未预热时,JM煤的失重结束温度为470℃左右,FD煤为640℃左右;而预热300℃时,JM煤的失重结束温度为460℃左右,FD煤为620℃左右。预热后的煤粉表面结构发生了明显变化,层状和孔隙结构增加,从而提高了煤粉的燃烧率,为提高喷吹煤粉燃烧率提供了理论基础。
关键词:
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喷吹用煤 /
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预热 /
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燃烧率 /
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失重率 /
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孔隙结构
Abstract:
By using two kinds of pulverized coal(namely,bitumite JM and anthracite FD) for BF injection from Handan Iron and Steel Co.,Ltd.as raw materials,the differential thermal analysis(DTA) of the pulverized coal preheated under different temperature was carried out and its combustion ratio determined.Experimental results show that the weight loss start temperatures of the two kinds of the pulverized coal are approximately the same at about 50℃.Without preheating,the weight loss finish temperature of JM is about 470℃,and FD about 640℃,while in the case of preheating at 300℃,the former decrease to about 460℃,and the latter to about 620℃.After preheating,the pulverized coal's surface structures have noticeably changed,and the increase of layered and pore structures results in improvement of combustion ratio.
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