Modeling of Three-Phase Flows and Slag Layer Behavior in an Argon Gas Stirred Ladle

Acta Metall Sin

2008, Vol. 44

Issue (10): 1198-1202 DOI:

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Modeling of Three-Phase Flows and Slag Layer Behavior in an Argon Gas Stirred Ladle

东北大学材料与冶金学院

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. Modeling of Three-Phase Flows and Slag Layer Behavior in an Argon Gas Stirred Ladle. Acta Metall Sin, 2008, 44(10): 1198-1202 .

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Abstract 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 porous plugs. Multiphase Volume of Fluid (VOF) method is used to simulate the slag layer behaviors. Numerical results produce the following transient phenomena: when argon gas is injected into molten steel in a ladle, gas rising passage is formed near the plug, and then bubbles are created in the interior of molten steel; the rising gas bubbles impinge the slag intermittently and breakthrough the slag layer to create the slag eye. Simultaneity, the wave at interface of slag-steel formed and wave frequency increases with the increasing of argon gas flow rate for one off-centered plug case. Parametric studies show that diameter of slag eye changes from 0.43 m to 0.81 m while the argon gas flow rate vary with 100 ~300 Nl/min for a 220 ton ladle. The non-dimensional areas of slag eye vs the modified Froude number is close to experimental data in literature. 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 accordingly. The steel downward flow velocity at the slag eye periphery can be affected significantly by Ar gas flow rate. The higher the velocity, the more slag emulsification can be expected.

Key words: Ladle metallurgy Slag layer behavior Three-phase flow Mathematical model

Received: 25 March 2008

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