底吹钢包内离散气泡运动及界面波动对脱硫行为影响  

Influence of discrete bubble movement and interface fluctuation on desulfurization behavior in the bottom-blown ladle furnace

作　　者：张麒格 李宝宽 王长军 Zhang Qige;Li Baokuan;Wang Changjun(School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,沈阳110819

出　　处：《材料与冶金学报》2021年第1期31-37,44,共8页Journal of Materials and Metallurgy

摘　　要：为了分析钢包内离散气泡和界面波动对脱硫效率的影响,本文采用数值模拟法,选择大涡模拟和离散相模型,结合界面追踪法建立三维瞬态渣-金-气三相流模型,模拟气泡行为及渣层变化规律,同时利用相间传质求解发生于钢包内渣-金界面处的脱硫过程.本模型设置压力为101.325kPa,反应温度为1873K,考虑了气泡运动、变形、破碎、碰撞等行为对脱硫的影响,为预测底吹钢包搅拌过程的脱硫、卷渣及气泡行为提供了理论依据.计算结果表明,初始直径为0.001m的气泡吹气稳定后最大直径达到0.009m,并且随着吹气量的增加,硫的传质速率也不断增大,且喷嘴上方渣-金界面处的脱硫速率较快.In order to analyze the influence of discrete bubbles and interface fluctuation in the ladle furnace on the desulfurization efficiency, a three-dimensional transient slag-steel-gas multiphase flow model was established using numerical methods including large eddy simulation, volume of fluids and discrete phases to simulate bubble behavior and slag layer variation. At the same time, the desulfurization process at the slag-steel interface was solved considering the interphase mass transfer. In the model, the pressure and temperature were set as 101.325 kPa and 1 873 K, and the influence of bubble movement, deformation, breakage as well as collision on desulfurization were taken into account. Therefore, it can provide a basis for predicting desulfurization, slag entrapment and bubble behavior in the bottom-blown ladle process. The calculation results showed that when the initial bubble diameter is 0.001 m, the maximum diameter reaches 0.009 m after the gas blowing becomes stable. Also, the mass transfer rate of sulfur during the desulfurization process increases with the increasing of the gas blowing rate, and the desulfurization at the slag-steel interface above the plug is faster.

关 键 词：底吹钢包 脱硫 三相流 界面追踪法 离散气泡 

分 类 号：TF701.2[冶金工程—钢铁冶金]