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<p>The production of clean steel necessitates efficient removal of sub-50 <i>µ</i>m non-metallic inclusions, which conventional flow control devices struggle to capture effectively. While gas curtains improve flotation of small inclusions, optimizing curtain positioning remains challenging due to the complexity of bubble–inclusion interactions and difference of zone flow characteristics. This study employs a 3D Eulerian–Eulerian two-fluid model with interfacial area transport equations to analyze tundish flow dynamics under three gas curtain configurations. A novel multi-chamber partitioning strategy evaluates velocity fields, kinetic energy distributions, and residence times across regions. Key findings reveal that positioning the argon curtain closer to the inlet achieves maximum molten-steel residence time, reduces dead zones by 95&#xa0;pct, and stabilizes outlet flows, while enhancing inclusion collisions <i>via</i> elevated local kinetic energy. This configuration produces larger bubble injection deflection under constant gas rates, improving energy transfer efficiency with minimal surface turbulence compared to other positions. Furthermore, the discrete-phase model was employed to simulate the motion of inclusions in the tundish under different configurations. The results show that the removal rate of small inclusions in the configuration that positions the argon curtain closer to the weir increases by approximately 20&#xa0;pct in comparison with the no-curtain case, whereas curtain positioning near the outlet yields an enhancement of only about 5&#xa0;pct. This study provides scalable guidelines for optimizing gas curtain placement to simultaneously enhance small inclusion removal and casting stability.</p>

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Optimizing Argon Curtain Positioning for Fine Inclusion Removal in Tundish: An EE-IATE-DPM Model-Based Computational Study

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Qiang Li,
  • Jingmin Peng,
  • Suwei Ma,
  • Petrus Christiaan Pistorius

摘要

The production of clean steel necessitates efficient removal of sub-50 µm non-metallic inclusions, which conventional flow control devices struggle to capture effectively. While gas curtains improve flotation of small inclusions, optimizing curtain positioning remains challenging due to the complexity of bubble–inclusion interactions and difference of zone flow characteristics. This study employs a 3D Eulerian–Eulerian two-fluid model with interfacial area transport equations to analyze tundish flow dynamics under three gas curtain configurations. A novel multi-chamber partitioning strategy evaluates velocity fields, kinetic energy distributions, and residence times across regions. Key findings reveal that positioning the argon curtain closer to the inlet achieves maximum molten-steel residence time, reduces dead zones by 95 pct, and stabilizes outlet flows, while enhancing inclusion collisions via elevated local kinetic energy. This configuration produces larger bubble injection deflection under constant gas rates, improving energy transfer efficiency with minimal surface turbulence compared to other positions. Furthermore, the discrete-phase model was employed to simulate the motion of inclusions in the tundish under different configurations. The results show that the removal rate of small inclusions in the configuration that positions the argon curtain closer to the weir increases by approximately 20 pct in comparison with the no-curtain case, whereas curtain positioning near the outlet yields an enhancement of only about 5 pct. This study provides scalable guidelines for optimizing gas curtain placement to simultaneously enhance small inclusion removal and casting stability.