45t钢包底吹氩钢液流动的水模拟研究

Water modeling on fluid flow in a 45 t ladle with bottom argon blowing process

以国内某钢厂45t钢包为研究对象,在相似原理的基础上建立了钢包吹氩水模型(模型与原型的几何比为1∶2.5),研究了吹氩孔的位置和吹氩流量对钢液混匀特性的影响。实验发现:无论是单孔吹氩还是双孔吹氩都存在一个临界流量,在临界流量时钢液混匀特性最好。其中对于单孔吹氩工艺,吹氩位置在距离钢包底部中心0.5R(钢包底半径)处较合理,模型临界流量为0.35m3/h;对于双孔吹氩工艺,两孔位置在0.5R、角度为45°较理想,模型临界流量为0.40m3/h。工业试验表明,改进后的吹氩方案在降低总氧和夹杂物方面均优于改进前的吹氩方案。

On the basis of the theory of similarity a water model for ladle argon bubbling is established（the geometrical ratio between the model and prototype is 1∶2.5） and the effects of the position of argon bubbling hole and the flow rate of argon bubbling on the homogeneity of hot metal mixing are studied as well.Experiments turns out that whether the argon bubbling is carried out by a single hole or double holes there exists a critical flow rate,in which the homogeneity of the hot metal mixing shows the best.For the single hole process the more appropriate position of argon bubbling is at 0.5R（ladle bottom radius） away from the ladle bottom center and the critical flow rate of the model is 0.35 m3/h and for the double holes process the position of the holes is at 0.5R with the angle of 45 and the critical flowrate is 0.40 m3/h.Industrial experiments show that the improved argon blowing process is better than the original one in reducing total oxygen and inclusions.