钢包底吹氩卷渣临界条件的水模型研究

A Study on Water Modeling of Ladle with Bottom Argon Blowing in Critical Slag Entrapment Condition

以钢厂70t钢包为原型,建立模型与原型尺寸比为1:2.75的水模型。通过水模型实验对钢包临界卷渣吹氩量进行测量,得到临界卷渣气量是450 L/min。实验测量不同吹气量下钢包液面水平流速,分析水平流速与钢包卷渣的关系,得到钢包临界卷渣的液面流速为0.652m/s、韦伯准数为6.967。讨论了采用临界卷渣韦伯准数计算临界卷渣液面流速,通过测量达到临界卷渣液面流速时的吹氩量,来确定临界卷渣吹氩量的方法。

According to a 70 t ladle prototype at steel works, the water model with model-prototype linear scale ratio 1 ： 2.75 has been established. The obtained critical blowing gas rate was 450 L/min by water modeling test to measure the rate of ladle bottom blowing argon in critical slag entrapment condition. The horizontal flow velocity of liquid surface in ladle with different gas blowing rate was measured in test to analyze the relation between horizontal flow velocity and liquid en- trapped slag in ladle and get the liquid surface flow rate in critical slag entrapment condition being 0. 652 m/s and its Weber index in that condition being 6. 967. Using critical Weber index to calculate liquid surface flow velocity in critical slag entrapment condition and method to define the argon blowing rate for critical liquid entrapped slag by measuring the argon blowing rate up to liquid surface flow rate in critical slag entrapment condition are discussed in this paper.