Online prediction of surface velocity, vortex position and fluid flow pattern in mold
ZHOU Haichen1,2,3, LUO Yanzhao1,2,3, LI Haibo1,2,3, JI Chenxi1,2,3, HE Wenyuan4, HAO Ning1,2,3
1. Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China; 2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing 100043, China; 3. Beijing Engineering Research Center of Energy Steel, Beijing 100043, China; 4. Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063200, Hebei, China
Abstract：The flow pattern of molten steel in the mold directly affects the quality of steel slabs. During the continuous casting process, the mold like a 'black box' and the flow field in the mold cannot be obtained. A mathematical model of the multiphase flow in the slab continuous casting mold was built. The distribution of molten steel flow and fluid flow pattern were analyzed under different casting parameters using numerical simulation method. The calculated maximum velocity of molten steel at the top surface, the coordinate value of vortex position, and the critical relationship for the transition of the flow pattern were fitted and prediction equations were obtained. These calculation results were built into a database. Then, the database was extended with programming method and a software with user interface visualization was developed. The predictive model was connected to the secondary control system of the continuous casting, which realized the online prediction of the molten steel maximum velocity at the top surface, the vortex center position, and the fluid flow pattern in the mold. By optimizing the mold flow field online, the slag entrainment defect rate of ultra-low carbon steel was controlled below 3%.
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2023, Vol. 42 
