Modeling of Three-phase Flows and Behavior of Slag/Steel Interface in an Argon Gas Stirred Ladle
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概要
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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.
- 社団法人 日本鉄鋼協会の論文
- 2008-12-15
著者
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TSUKIHASHI Fumitaka
Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of To
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Tsukihashi Fumitaka
Department Of Advanced Materials Science Graduate School Of Frontier Sciences The University Of Toky
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Tsukihashi Fumitaka
Department Of Advanced Materials Graduate School Of Frontier Science The University Of Tokyo
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Yin Hongbin
Process Res. East Chicago (usa) Center Arcelormittal Global R&d
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Yin Hongbin
Mittal Steel Usa Research Center
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LI Baokuan
School of Materials and Metallurgy, Northeastern University
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ZHOU Chenn
Department of Mechanical Engineering, Purdue University Calumet
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Zhou Chenn
Department Of Mechanical Engineering Purdue University Calumet
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Li Baokuan
School Of Materials And Metallurgy Northeastern University
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Li Baokuan
School Of Materials And Metallurgy Northeastern Univ.
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Tsukihashi Fumitaka
Department Of Advanced Material Science The University Of Tokyo
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