Qu Tianbao,Li Zhiguang,Sun Tuo,et al.Numerical Simulation of Structural Optimization And Process Parameter Control of Submerged Nozzles For Wide And Thick Slab[J].Special Steel,2026,47(02):89-99.
Qu Tianbao,Li Zhiguang,Sun Tuo,et al.Numerical Simulation of Structural Optimization And Process Parameter Control of Submerged Nozzles For Wide And Thick Slab[J].Special Steel,2026,47(02):89-99.DOI: 10.20057/j.1003-8620.2025-00164.
Numerical Simulation of Structural Optimization And Process Parameter Control of Submerged Nozzles For Wide And Thick Slab
The submerged nozzle is the guiding part of molten steel flow in continuous casting mold. Optimizing the structure of submerged nozzle and improving the flow state of molten steel are of great significance for producing high quality cast billet.The flow field in the continuous casting mold with a size of 230 mm×1 650 mm wide and thick slab in a steel plant in Henan Province was systematically studied, and a numerical simulation was conducted using FLUENT software. In view of the violent fluctuation of molten steel level in the mold during production, a new flat nozzle is adopted to analyze the influence of the replaced submerged nozzle on the flow field of molten steel in the mold.Research findings indicate that substituting the flat nozzle led to a more favorable flow pattern of the molten steel within the mold. Before the replacement, the free steel liquid surface velocity in the circular nozzle mold fluctuated greatly, and the velocity of the steel-slag interface within the range of 0 m-0.3 m from the nozzle fluctuate greatly and reach a maximum of 0.3 m/s. It caused severe fluctuations in the steel liquid surface and surface slag inclusion behavior, seriously affecting the quality of the cast billet. In addition, the turbulent energy of a flat nozzle is reduced by 50% compared to a circular nozzle. Which significantly reduce the risk of nozzle clogging and increasing the service life of submerged nozzles. Comprehensive analysis shows that the new flat nozzle is more suitable for wide and thick plate site than the circular nozzle.Finally, the process parameters of the flat nozzle were simulated, and the results showed that when the nozzle was immersed at a depth of 125 mm, pulled at a speed of 0.8 m/min, and tilted at an angle of 15 °, a relatively ideal flow field shape of the mold could be obtained. This provides the best process plan for the use of this new nozzle and provides reference and guidance for the steel and iron enterprise to formulate reasonable process parameters.
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