Numerical simulation of the effect of nozzle nodule on the behavior of molten steel in slab continuous casting mold
MA Hao-ran1, LI Shuang-jiang1, LIU Hong-bo1, LIU Chong1, YAO Liu-jie2
1. HBIS Group Technology and Research Institute, Shijiazhuang 050023, Hebei, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：Taking the mold of 230 mm×1 600 mm slab continuous casting machine as the research object, the VOF model was established by CFD numerical simulation method, and the influence of continuous casting nozzle nodule on steel slag interface fluctuation and molten steel flow behavior was studied. The results show that the flow field in the mold is a typical double circulation morphology when there is no nodule at the nozzle.When there is nodule at the nozzle, there will be serious asymmetric flow on both sides of the nozzle in the mould, with a small range of nodule side stream and a large range of non-nodule side stream. The increase of kinetic energy on the non-nodular side of the nozzle leads to the decrease of the vortex center under the mold, which will increase the impact depth of the molten steel. In addition, due to the high vortex center on the nodule side of nozzle, the fluctuation of meniscus surface and steel slag surface is disordered. In the case of nodules, the steel fluid fluctuates greatly, with the maximum fluctuation difference of 4.03 mm. Without nodules, the fluctuation of molten steel is relatively stable, with the maximum fluctuation difference of 1.4 mm.
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2020, Vol. 39 
