100t单咀真空精炼炉底吹位置的优化

Optimization of Bottom Gas Blowing Position in 100 t Vacuum Refining Furnace with Single Snorkel

结合钢厂100 t单咀真空精炼炉相关参数,运用数值模拟的方法对脱气时单咀炉内的钢液流场进行了仿真计算,分析单咀炉内钢液流动的基本特征,研究了距底部圆心0.1～0.424 m吹气位置对钢液流场、钢液循环流量和混匀时间的影响。结果表明,原吹氩位置(距底部中心0.424 m),大部分氩气没有进入浸渍管,为避免氩气逸出,吹气孔距圆心应≤0.3 m;随吹气位置至圆心距离增大,钢水混匀时间减小,综合考虑钢液脱气效果和浸渍管寿命,最佳吹气位置应为距底部中心0.25～0.3 m处。

Combined with relative parameters of a 100 t vacuum refining furnace with single snorkel at steel works, the imitated calculation for liquid field in degassing of vacuum refining furnace with single snorkel has been carried out by numerical simulation method to analyze the basic characteristics of liquid flow in furnace with single snorkel, and the effect of blowing position with distance from bottom center 0. 1 - 0. 424 m on liquid flow field, liquid circulation rate and mixing time is studied. Results show that for origin argon blowing position （ distance from bottom center 0. 424 m） the most argon doesn＇ t enter into snorkel, in order to avoid argon escape, the blowing nozzle distance from bottom center should be ≤ 0. 3 m, with increasing blowing nozzle distance, mixing time of liquid decreases, and combined considering the effect of liquid degassing and life of snorkel, the optimum gas blowing position is at distance from bottom center 0. 25 - 0. 3 m.