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建立了特厚板坯结晶器三维流动、传热和凝固耦合数学模型。根据不同规格板坯实际工况,对比分析了特厚板坯结晶器宽度和厚度变化对结晶器内流场和温度场的影响。结果表明,结晶器宽度增加时,流股冲击深度增大、冲击强度减小。特厚板坯连铸过程中液面流速较常规板坯偏低,流速随宽度增大而减小,水口附近存在低流速区,不利于保护渣的熔化。宽度增加时坯壳的厚度趋于均匀,中心流股对坯壳的冲刷强度是影响坯壳均匀性的主要原因。结晶器厚度增加时,流股冲击深度基本一致,冲击速度下降,液面流速亦随之减小。厚度增加时坯壳不均匀性呈增大趋势,温度场均匀性是影响坯壳均匀性的主要原因。
A coupled three-dimensional flow, heat transfer and solidification mathematical model of extra-thick slab mold was established. According to the actual working conditions of slabs with different specifications, the influence of the variation of width and thickness of slab mold on the flow field and temperature field in mold was analyzed. The results show that when the mold width is increased, the impingement flow depth and the impact strength decrease. In the process of slab continuous casting, the liquid surface velocity is lower than that of conventional slab, the flow velocity decreases with the increase of width, and the low flow velocity zone exists near the nozzle, which is not conducive to the melting of the flux. When the width increases, the thickness of the shell tends to be uniform, and the erosion strength of the shell on the central stream is the main factor that affects the uniformity of the shell. When the mold thickness is increased, the impulse depth is basically the same, the impact velocity is decreased and the liquid velocity is also reduced. When the thickness increases, the unevenness of the shell increases, and the uniformity of the temperature field is the main reason that affects the uniformity of the shell.