高炉下部气相压降特性的模拟研究  

Simulation Study on Gas Pressure Drop Characteristics in the Lower Zone of Blast Furnace

作　　者：熊玮[1] 毕学工[1] 周国凡[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《高校化学工程学报》2007年第2期233-238,共6页Journal of Chemical Engineering of Chinese Universities

摘　　要：为了阐明高炉下部气相压降的特性,在填料床内模拟高炉下部流动条件进行了气液两相逆流的流体力学实验。结果表明在气相雷诺数较小时,由于停滞孔隙率的存在,实测压降值比修正厄根方程计算的值大;气相雷诺数较大时,气液界面上产生的粘性曳力较小,实测压降值比修正厄根方程计算的值小。对实验结果进行回归得到了阻力系数与气相雷诺数的关系,并提出了新的气相压降计算模型。当填料密度比液体密度小时,在液泛前填料会发生松动和膨胀,通过修正填料床的孔隙度可以计算膨胀填料床的压降。填料膨胀率的大小与液体流量、填料的流化速度及自由沉降速度有关。在实验数据范围内,模型的计算结果与实测值吻合较好。The hydrodynamic experiments with countercurrent flow of gas and liquid simulating the flow conditions in the lower zone of the blast furnace were carried out in a packed bed to clarify the gas pressure drop characteristics in that zone. The results show that, comparing with the gas pressure drops calculated by the modified Ergun equation, in the cases of the gas Reynolds number is small, due to the presence of the dead space, the observed △p in the experiments are bigger than that obtained by calculation, and when the gas Reynolds number is large, because of the small interfacial viscous drag-force between gas and liquid, the △p observed are smaller than that obtained by calculation. Based on the relationship between the resistance coefficient and gas Reynolds number, a new equation used for the calculation of the pressure drop was derived. When the density of the packing material is smaller than that of the liquid, the packed bed becomes less dense and will expand before flooding. The expansion ratio is related to the liquid flow rate, fluidization velocity and free descending velocity of the packing material. The pressure drop in an expanding pack bed can be calculated by modifying the porosity of the bed, and then, by using the proposed equation, a good agreement can be obtained between the calculated and experimental data.

关 键 词：高炉 滴落带 气液逆流 压降 数学模型 

分 类 号：TF543.2[冶金工程—钢铁冶金] TQ021.1[化学工程]