插入浸渍圆筒底吹氩钢包内钢液搅拌行为的水模型研究

以150 t钢包为原型,采用几何相似比1:7的水模型,研究插入钢包的浸渍圆筒直径(50~130 mm) ， 插入深度(30~150 mm)和底吹气体流量(0.03~0.48 m³/h)对钢液混匀时间和液面振幅的影响。结果表明,随浸渍圆筒直径和插入深度的增加,液面振幅减小;随底吹气量增加,液面振幅增大;不插入浸渍圆筒时不发生卷渣的临界底吹气量为0.09 m~³/h,混匀时间为10 s;插入直径130 mm、深度90 mm的浸渍圆筒时,不发生卷渣的临界底吹气量为0.30 m³/h,最短混匀时间为4 s。实验数据回归分析得出150 t钢包内钢液均混时间-t’与底吹气量-Q’、浸渍圆筒直径-d’和插入深度h’的关系为t’=2.69+0.017 9 d’+0.011 2h’-0.425 Q’。

A Study of Water Modelling on Stirring Behavior of Liquid Steel in Bottom-Blowing Ladle with Immersed Cylinder

Based on prototype of 150 t ladle, the effect of diameter of immersed cylinder inserting in ladle (50 ~ 130 mm), inserting depth (30 ~ 150 mm) and bottom blowing gas rate (0. 03 -0.48 m³/h) on mixing time of liquid and amplitude of liquid level has been studied by using geometry similarity ratio 1 ： 7 water model. Results show that with increasing immersed cylinder diameter and inserting depth, the amplitude of liquid level decreases; with increasing bottom gas blowing rate the amplitude of liquid level raises ； in condition without inserting immersed cylinder the critical gas blowing rate for non-occurring slag entrapment is 0. 09 m³/h and mixing time is 10 s; in condition of inserting immersed cylinder with diameter 130 mm and inserting depth 90 mm, the critical gas blowing rate for non-occurring slag entrapment is 0. 30 m³/h and shortest mixing time is 4 s. It is obtained by test data regression analysis that for 150 t ladle the relation between liquid mixing time U with bottom gas blowing rate Q^', immersed cylinder diameter d' and inserting depth is t^'=2.69 +0.017 9 d ^'+ 0.011 2 h'—0.425 Q'.