Numerical study on a new swirling flow pocket brick for tundish upper nozzle during continuous casting of steel

Qin, Xufeng; Cheng, Changgui; Li, Yang; Zhang, Chunming; Jin, Yan

doi:10.1080/03019233.2023.2266262

Cited by 4 publications

(1 citation statement)

References 36 publications

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“…The tundish is a vital component in continuous casting, influencing the cleanliness and quality of molten steel and the final product. 1,2 To enhance steel flow and improve cleanliness, various approaches have been explored, including the addition of flow control devices, [3][4][5] redesigning the tundish structure [6][7][8] and utilising electromagnetic flow control equipment. [9][10][11] While redesigning the tundish structure can be effective in enhancing flow behaviour and increasing inclusion removal efficiency, it often necessitates costly replacement and results in more complex structures.…”

Section: Introductionmentioning

confidence: 99%

Structural optimisation of three-strand asymmetric tundish for super large round bloom continuous casting

Chen,

Bai,

Feng

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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In recent years, there has been significant development in the large-scale utilisation of round bloom continuous casting, which has led to an increase in the strand spacing of the tundish. However, this increase often accompanies issues such as poor consistency among each strand. This study focuses on the three-strand asymmetric tundish used in super-large round bloom continuous casting and uses a combination of numerical simulation and physical experiment to investigate the impact of different dam and retaining wall structures on the flow, temperature and removal of inclusions in the super-large round bloom tundish. The reliability of the model is verified through isothermal Water model experiments. The results indicate that by employing an optimised flow control structure with a U-shaped retaining wall featuring small diversion holes and a dam near each of strands No.1 and No.3, several improvements are achieved compared to the prototype tundish. The dead zone ratio of the tundish is reduced by 16.33%, the standard deviation of average residence time decreases by 167.07 s, the volume of the tundish's low temperature zone decreases by 7.79% and the total inclusion removal ratio increases by 14.44%. By appropriately incorporating dams, reducing the area of diversion holes and modifying the retaining wall structure in the tundish, the flow, temperature and inclusion removal consistency of each strand can be effectively improved. This enhances the overall metallurgical efficiency of the tundish. Even when encountering strand blocking operation, the dead zone ratio can be further reduced to 22.44% using the optimised structure proposed in this study. This demonstrates that the optimised structure not only improves the steady-state metallurgical behaviour of the asymmetric three-strand tundish with large strand spacing for super-large round bloom but is also suitable for addressing unsteady-state metallurgical behaviour caused by on-site working conditions, such as production scheduling or high casting speed. By implementing the findings of this study, it is expected that the efficiency and effectiveness of the super-large round bloom continuous casting process will be significantly enhanced.

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Section: Introductionmentioning

confidence: 99%

Structural optimisation of three-strand asymmetric tundish for super large round bloom continuous casting

Chen,

Bai,

Feng

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

View full text Add to dashboard Cite

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Multiphase modelling of inclusion removal by bubble adhesion in the submerged entry nozzle with centrifugal swirling flow

Zhang,

Gu,

Wang

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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The most important way to improve the quality of steel is to reduce the number of non-metallic inclusions in the molten steel, which directly affects the quality of the billet. In this paper, a novel swirling flow generator (SFG) is intended to be installed around the inlet of the submerged entry nozzle (SEN) in the tundish to generate a centrifugal swirling flow by utilising gravitational potential energy. The discrete phase model and volume of fluid were adopted to simulate the motion and interaction between bubbles and inclusion particles in a rotating flow field. In the centrifugal swirling flow, collision behaviour between the inclusions and bubbles is considered by a self-developed user-defined function program. Computational fluid dynamics (CFD) simulation results show that the radial pressure gradient is favourable for the inclusion and bubble to move towards the centre, and the more number of blowing ports, the easier the bubbles move to the centre of the SEN, which greatly increases the collision probability between inclusions and bubbles. The application of the SFG could significantly improve the removal efficiency of inclusions. Therefore, it is more advantageous to eliminate the inclusions by injecting air bubbles into the swirling flow field.

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Study on electromagnetic stirring–braking structure layout design and its synergistic mechanism in electromagnetic metallurgy

Li,

Liu,

Yang

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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During the continuous casting process, electromagnetic stirring (EMS) can control the flow pattern of the molten steel on the meniscus in the slab mould, while it is difficult to effectively control the entire molten steel. To this end, a novel composite magnetic field structure of EMS and electromagnetic braking (EMBr) is proposed, and the EMS–EMBr synergistic mechanism is analysed. The flow field of molten steel without a magnetic field is analysed. The magnetic field regulation strategy required to control the molten steel is clarified. The coil core structure layout of existing EMS is analysed. The action mechanism of EMS is studied through simulation, revealing the poor control effect of EMS on the molten steel under high casting speeds. Thus, a novel EMS–EMBr structure layout is proposed to enable the braking magnetic field to cover the key areas within the slab mould, ensuring that the main flow is effectively suppressed. On this basis, the effects of EMS–EMBr synergy and different process parameters on the flow pattern of molten steel are studied. The results indicate that the EMS–EMBr composite magnetic field structure proposed can more effectively control the molten steel, providing technical support for the development of electromagnetic metallurgical equipment.

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Numerical study on a new swirling flow pocket brick for tundish upper nozzle during continuous casting of steel

Cited by 4 publications

References 36 publications

Structural optimisation of three-strand asymmetric tundish for super large round bloom continuous casting

Structural optimisation of three-strand asymmetric tundish for super large round bloom continuous casting

Multiphase modelling of inclusion removal by bubble adhesion in the submerged entry nozzle with centrifugal swirling flow

Study on electromagnetic stirring–braking structure layout design and its synergistic mechanism in electromagnetic metallurgy

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