高炉回旋区影响因素的冷态模型研究

Cold Model Study on Effect Factors of Blast Furnace Raceway Size

以重钢5号高炉实际尺寸和操作参数为基础,假设回旋区内的流动为气固两相流动,且气相流动为粘性不可压缩流动,根据相似理论建立了高炉回旋区三维冷态实验模型,分析了回旋区形成机理的影响因素。结果表明:鼓风量、料层属性、料层高度以及风口直径对回旋区大小和形状均有影响。随着鼓风量的增大,回旋区深度和高度均不同程度的增加,当风量过大时,回旋区炉料上浮,椭球形的回旋区形状不再存在。回旋区高度随料层高度的逐渐增加而减小。风口直径对回旋区穿透深度的影响较其对高度的影响明显。

On the basis of practical size and operating parameters of the No. 5 blast furnace in Chongqing Iron and Steel Company Limited, assuming that flow in the blast furnace raceway is a gas-solid flow and gas is viscous and incompressible fluid, three-dimensional cold experimental model of blast furnace raceway was established according to similarity theory, and effect factors of raceway size were analyzed. The results are demonstrated as the following： blast flow rate, physical properties of charging material, height of charging material and tuyere diameter have effect on size and shape of raceway. With increasing of blast flow rate, penetration depth and height of raceway increase to some different degrees. When blast flow rate is big excessively, material bed is rising and ellipsoidal raceway shape is damaged. The height of material bed has a little effect on raceway penetration depth, but raceway height diminishes gradually with height of material bed increasing. Tuyere diameter has remarkable influence to raceway penetration depth.