煤种和焦炭对造气炉料层透气性的影响研究

Experimental Study on Air Permeability of Coal Combustion Furnace with Coal and Coke

为克服喷吹煤粉给高炉冶炼带来的不利影响,提出了由造气炉燃烧普通煤产生煤气,自风口喷入高炉替代喷吹煤粉的新工艺,研究了煤种、焦炭添加和煤块粒度对造气炉料层透气性的影响,结果表明:烟煤对炉内料层透气性的影响较大,而无烟煤影响较小;随着无烟煤配比的增加,炉内最大压差逐渐降低,透气性变好,当烟煤和无烟煤的比例为7:3时,料层的透气性最好;焦炭加入量的增多,使得炉料开始收缩的温度升高,但炉内压差变化很小,对料层透气性影响不大;随着炉料粒度的增大,料层透气性明显改善,适宜的炉料粒度为10 ~ 12.5 mm。

In order to overcome the adverse effect of pulverized coal injection on blast furnace smelting, a new process was proposed to produce coal gas from gas generators burning ordinary coal and from the tuyere to blast furnace instead of pulverized coal injection. The coal, coke and coal particle size were studied. The effect on the gas permeability of the gasification furnace charge layer shows that the effect of the bituminous coal on the air permeability of the furnace bed is relatively large, and the anthracite coal has little influence;with the increase of the ratio of the anthracite coal, the maximum pressure difference in the furnace gradually decreases, and the gas permeability Better, when the ratio of bituminous coal and anthracite is 7:3, the air permeability of the material layer is the best;when the amount of coke added increases, the temperature at which the charge begins to shrink increases, but the pressure difference in the furnace changes little, and the material layer The effect of air permeability is not significant;with the increase of the particle size of the charge, the air permeability of the material layer is obviously improved, and the suitable charge particle size is 10~12.5 mm.