Large eddy simulation of the effect of EMBr on the flow behavior of thin slab continuous casting mold with ultra-high casting speed

CUI He-nan; ZHANG Jiang-shan; JI Chen-xi; WANG Guo-lian; LI Ming; LIU Qing

doi:10.13228/j.boyuan.issn1005-4006.20230023

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Continuous Casting ›› 2023, Vol. 42 ›› Issue (3) : 33-41. DOI: 10.13228/j.boyuan.issn1005-4006.20230023

Large eddy simulation of the effect of EMBr on the flow behavior of thin slab continuous casting mold with ultra-high casting speed

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Abstract

Thin slab continuous casting and rolling is an important technology to promote the efficient and green development of China’s iron and steel industry. Ultra high-speed continuous casting is the crucial technology that needs to be broken through to achieve efficient production of thin slab continuous casting and rolling. Understanding the flow characteristics of molten steel in the mold under ultra-high casting speed conditions and obtaining a stable flow field distribution are important prerequisites for increasing the casting speed. A complete geometry model and structured grid were established for the thin slab continuous casting mold equipped with multi-ports SEN. The effects of SEN structure, EMBr configuration, and EMBr intensity on the flow field distribution in the mold were studied by coupling the LES, VOF, and MHD models. The industrial nail dipping experiment was applied to obtain the surface velocity of the mold in actual production process, and the reliability of the numerical simulation method was verified by comparing the experimental results with simulation results under corresponding operating conditions. The results indicate that when the casting speed is 8.0 m/min, the application of multi-ports SEN will lead to a complex flow field structure, which has characteristics different from those of a traditional mold equipped with dual-ports SEN, such as multiple jets, strong impact, and weak circulation. When applying a 4-ports SEN and a 5-ports SEN, the penetration depth of the major steel jetting stream is as high as 1.6 m and 2.1 m, respectively. EMBr can effectively control the flow field, and the braking effects of different EMBr types vary. Type C, which can cover all the outlets of the multi-ports SEN, performs better in reducing the penetration depth and improving the stability of the flow field. The increase of the EMBr intensity has a significant impact on the flow field structure. The turning point of EMBr intensity of the flow field structure change is 300 mT. The flow field under this EMBr intensity is unstable and asymmetric. Therefore, when adjusting the magnetic field intensity in the production process, it is advised to avoid being within this EMBr intensity range for a long time to ensure the stability of the meniscus and the uniform growth of the shell.

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ultra-high speed casting / thin slab / multi-ports SEN / large eddy simulation / electromagnetic braking

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CUI He-nan, ZHANG Jiang-shan, JI Chen-xi, et al. Large eddy simulation of the effect of EMBr on the flow behavior of thin slab continuous casting mold with ultra-high casting speed[J]. Continuous Casting, 2023, 42(3): 33-41 https://doi.org/10.13228/j.boyuan.issn1005-4006.20230023

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