Numerical simulation of flow field and inclusion removal in filter controlled flow tundish
LIANG Zhen-jiang, ZHENG Wan, WANG Jun-chi, WANG Qiang, LI Guang-qiang
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
Abstract:Taking a 60 t slab continuous casting tundish as the research object, the Roynolds-averaged Navier Stokes (RANS), the Species Transport, and the Discrete Phase Model (DPM) were used to calculate the evolution of liquid steel flow field, inclusion trajectory and removal rate in the tundish at high drawing speed. The results show that for small inclusions of 10 μm, the inclusion removal rate is increased by 10% after the porous filtration control device is adopted. Compared with the 45° dip angle filter tundish, the inclusion removal rate of the 55° porous filter tundish increases by about 5.3%, and it's top hole is horizontal, which reduces the risk of slag entrapment and molten steel exposure.According to the RTD curve, the residence time of molten steel is slightly reduced by 30-50 s, and the volume ratio of dead zone is increased by 0.03%, but the inclusion removal rate is obviously improved. Consequently, the macro trend concept of flow field characteristic parameters such as residence time and volume ratio of dead zone can not be used to evaluate precisely the removal efficiency of inclusions in tundish with filter. the micro analysis such as velocity nephogram and inclusion trajectory should be better to evaluate its metallurgical effect of inclusion revomal.
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