高炉冷却壁冷却水管内液固两相流的数值模拟

Numerical Simulation on Liquid-solid Two-phase Flow of Water Cooling Pipe in Blast Furnace Cooling Stave

建立了高炉冷却壁三维物理模型。采用大型CFD软件FLUNT6.8中的欧拉多相流模型,对高炉冷却壁冷却水管内的液固两相流三维流动和污垢清洗特性进行了数值模拟研究。分析了流体的流速、固体颗粒的粒径、体积分数对流体的流动、清洗强度及清洗均匀的影响。结果表明:流体的湍流强度、壁面污垢清洗强度和压力降均随流速、颗粒粒径和体积分数的增加而增加;液固流态化清洗防垢除垢效果取决于流速、液固颗粒粒径和体积分数的合理组合;综合考虑节水节能及污垢清洗的均匀性,高炉冷却壁的最佳流速为2.0～2.5 m/s,固相颗粒粒径为3～4 mm,体积分数为5%～8%。研究结果为高炉冷却壁液固流态化污垢在线清洗的工业应用提供了理论基础。

A three-dimensional model of blast furnace cooling stave is established. The fluid flow and fouling cleaning characteristics of liquid-solid two-phase flow in water cooling pipe were stimulated utilizing the Euler multiphase model of FLUENT software. The effect of flow velocity, particle size and the volume fraction on fluid flow, cleaning intensity and cleaning uniformity were analyzed. The results show that the turbulence intensity, fouling cleaning intensity and pressure drop increase with the increase of flow velocity, particle size and the volume fraction. The effect of liquid-solid fluidzedbed cleaning fouling depends on the reasonable combination of flow velocity, particle size and the volume fraction. Through an integral consideration of water saving and energy saving and uniformity of fouling cleaning, the optimum flow velocity of flow, particle size and volume fraction are 2.0 m/s -2.5 m/s, 3 mm-4 mm and of 5%-8vol%, respectively. The numerical simulation results can provide theoretical basis for the application of liquid-solid fluidzed-bed on-line fouling cleaning in blast furnace cooling stave.