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本文研究了钢包喷吹时,供入气流而造成钢液强烈搅动的气泡泵现象。为研究这一现象提出了一种全浮力模型。模型提供了定量分析钢液被搅动的程度和供入能量之间关系的基础。通过在60t钢包内液流速度的实际测定,获得了单位时间内因受气泡泵的作用而进入循环的钢液量与供入气体流量和熔池深度的关系式。这种气泡泵作用的效率是很高的,在正常喷吹条件下,1kg惰性气体(Ar)可以使重量比本身大50万倍左右的钢液向上运动而进入循环。已经发现,对60t钢包内喷吹氩气时,包内钢液对流循环的周期只需20～35 sec,加入物料达到足够均匀所需的混合时间约1.0～1.5 min。
In this paper, we study the bubbling pump phenomenon which is caused by the strong stirring of liquid steel during the ladle blowing. To study this phenomenon, a full buoyancy model is proposed. The model provides the basis for a quantitative analysis of the relationship between the degree of agitation of molten steel and the energy supplied. Through the actual measurement of the liquid velocity in the 60t ladle, the relation between the volume of molten steel entering the circulation and the inflow of gas and the depth of the molten pool due to the action of the bubble pump per unit time was obtained. The efficiency of the bubble pump is very high, under normal injection conditions, 1kg of inert gas (Ar) can make its weight than its own 500,000 times the liquid steel up to enter the cycle. It has been found that the cycle of convection of the molten steel in the pack is only 20 to 35 sec when Ar gas is injected into the 60 t ladle and the mixing time necessary to achieve sufficient homogeneity of the material is about 1.0 to 1.5 min.