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Formation of free-surface vortex and vortex suppression by rotating stopper-rod at end of tundish casting

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Abstract

A rotating stopper-rod technique was proposed to suppress the formation of free-surface vortex in the tundish. The large eddy simulation model coupled with volume of fluid model was developed to study the steel–slag–gas three-phase flow behavior. The critical slag entrapment height of the free-surface vortex and mass of residual steel were predicted at different rotating speeds (30, 60, 90 and 120 r/min) of the rotating stopper-rod. The numerical model was verified by water model experiment. The results showed that by rotating the stopper-rod in the opposite direction of the vortex above the submerged entry nozzle, the formation of vortex can be effectively disturbed and the critical height of the free-surface vortex can be reduced. Particularly for the 2nd strand, when the rotating speeds are 30, 60, 90 and 120 r/min, the critical height of the free-surface vortex above the 2nd strand is 7.3, 4.7, 6.3 and 7.4 cm, respectively. A reasonable rotating speed should be 60 r/min, which can reduce about 2 tons of residual steel. Other rotating speeds just can reduce about 1.6 tons of residual steel.

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Acknowledgements

The authors would like to express their gratitude for the financial support provided by the National Natural Science Foundation of China (52004191), the China Postdoctoral Science Foundation (2022M711120) and the Science and Technology Research Project of Education Department of Hubei Province (B2022020). Besides, the numerical calculation is supported by High-Performance Computing Center of Wuhan University of Science and Technology.

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Qing Fang, Peng Zhao, Hua Zhang, Jia-hui Wang & Hong-wei Ni

  2. Hunan Valin Xiangtan Iron and Steel Co., Ltd., Xiangtan, 411101, Hunan, China

    Qing Fang, Wen-hao Zhou & Gang Yu

  3. Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Peng Zhao, Hua Zhang, Jia-hui Wang & Hong-wei Ni

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  1. Qing Fang
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  2. Peng Zhao
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  3. Hua Zhang
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Correspondence to Hua Zhang.

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Fang, Q., Zhao, P., Zhang, H. et al. Formation of free-surface vortex and vortex suppression by rotating stopper-rod at end of tundish casting. J. Iron Steel Res. Int. 31, 1104–1116 (2024). https://doi.org/10.1007/s42243-023-01150-w

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  • DOI: https://doi.org/10.1007/s42243-023-01150-w

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