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对全国部分大高炉的煤粉质量和瓦斯灰的碳含量进行了分析,确定了首钢迁钢大高炉煤粉质量总体处于下等水平,瓦斯灰的碳含量偏高,达到32.6%(质量分数,下同)。迁钢2号高炉煤粉利用率随煤比的提高而降低,煤比在190kg/t以内时,煤粉利用率为98.25%以上。在对迁钢2号高炉煤粉利用率及煤粉燃烧率研究的基础上,提出了对其煤粉质量控制的建议:煤粉中粒径在0.074mm以下的比例在60%左右,煤粉挥发分控制在22%～25%比较合适。
The quality of pulverized coal and the carbon content of gas ash in some big blast furnaces in China were analyzed. The quality of pulverized coal in Shougang Iron and Steel Co., Ltd. Was generally lower and the carbon content of gas ash was high, reaching 32.6% (mass fraction, The same below). The coal utilization rate of No.2 blast furnace in QGang decreased with the increase of coal ratio. When the coal ratio was within 190kg / t, the coal utilization efficiency was over 98.25%. Based on the research on coal utilization and pulverized coal combustion rate of No.2 blast furnace in Qiangang Iron and Steel (Group) Co., Ltd., A suggestion was put forward for pulverized coal quality control. The proportion of pulverized coal below 0.074mm was about 60% Volatile control in 22% ~ 25% is more appropriate.