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首页> 外文期刊>ISIJ international >Modeling Of Three-phase Flows And Behavior Of Slag/steel Interface In An Argon Gas Stirred Ladle
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Modeling Of Three-phase Flows And Behavior Of Slag/steel Interface In An Argon Gas Stirred Ladle

机译：氩气搅拌钢包中三相流和渣/钢界面行为的建模

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A Mathematical model has been developed to analyze the transient three-dimensional and three-phase flow in an argon gas bottom stirring ladle with one and two off-centered porous plugs. Multiphase Volume of Fluid (VOF) method is used to simulate the behaviors of slag layer. Numerical simulation was conducted to clarify the transient phenomena of gas injection into the molten steel. When argon gas is injected into molten steel in a ladle, the gas rising passage is formed near the plug, and then bubbles are created in the molten steel. The rising gas bubbles impinge on the slag intermittently and break the slag layer to create the slag eye. Simultaneously, the wave at the slag-steel interface was formed and the wave frequency increases with the increase of argon gas flow rate for one off-centered plug case. The modeling simulations show that the diameter of slag eye changes from 0.43 to 0.81 m when the flow rate of argon gas varies from 100 to 300 NL/min for a 220 ton ladle. The relationship between non-dimensional areas of slag eye and the modified Froude number is in good agreement with the experimental data reported in literature. At the same total gas flow rate of 300 NL/min, the two-plugs generate two eyes with the diameters of around 0.6 m. Since the significant deformation of slag layer occurs during gas stirring operation, the thickness of slag becomes thin near the slag eye and thick near the ladle wall, respectively. The downward flow velocity of steel at the slag eye periphery may be affected significantly by flow rate of Ar gas. Therefore, when the downward flow velocity would be larger, the more emulsification of slag could be expected.
机译：已经开发了数学模型来分析带有一个和两个偏心多孔塞的氩气底部搅拌钢包中的瞬态三维和三相流。采用多相流体​​体积（VOF）方法模拟了渣层的行为。进行了数值模拟，以阐明气体注入钢水的瞬态现象。当将氩气在钢包中注入钢水时，在塞子附近形成气体上升通道，然后在钢水中产生气泡。上升的气泡间歇地撞击在炉渣上并破坏炉渣层，形成炉渣眼。同时，在一个偏心塞子情况下，在钢渣界面处形成波，并且波频率随着氩气流量的增加而增加。建模模拟表明，对于220吨钢包，当氩气流量从100到300 NL / min变化时，渣眼直径从0.43变为0.81 m。渣眼无量纲面积与修正的弗洛德数之间的关系与文献报道的实验数据吻合良好。在相同的总气体流量300 NL / min的情况下，两个塞产生直径为0.6 m的两只眼。由于在气体搅拌操作期间发生炉渣层的明显变形，因此炉渣的厚度在炉渣眼附近变薄并且在钢包壁附近变厚。钢在渣眼周边的向下流动速度可能会受到氩气流量的显着影响。因此，当向下的流速较大时，可以预期炉渣的乳化程度更高。

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