EMBr对板坯结晶器钢液流动、传热及夹杂物去除的影响

Effect of EMBr on fluid flow,heat transfer and inclusion removing during CC

  • 摘要: 采用数值模拟方法研究了不同磁感应强度下电磁制动(EMBr)对某钢厂结晶器流场、传热以及夹杂物去除的影响.结果表明采用电磁制动,结晶器内流体的表面流速增加,对窄面冲击深度减少,结晶器自由表面温度升高,高温区上移而且范围扩大.随着磁感应强度增加,自由液面温度提高2~5℃,这有助于保护渣的熔化,可改善弯月面的钢液流动特性.夹杂物尺寸越大,越容易为结晶器液面所吸收去除,对于尺寸大于30μm的夹杂物,磁感应强度越大,夹杂物越容易被结晶器保护渣所吸收.

     

    Abstract: A computational fluid flow model was applied to investigate the effects of electromagnetic brake (EMBr) field strength on flow in the mold cavity. The three-dimensional, steady k-ε model of the nozzle and liquid cavity in the mold applied for the magnetic induction method in FLUENT to add the localized-type static EMBr field which was measured at a steel plant. The 3-D fluid flow, heat transfer, and inclusion removing on top free surface in a continuous casting strand with EMBr were investigated. It is found that EMBr effectively slows the speed of molten steel exiting from the nozzle outlet, reduces impingement impact of the jet on the narrow face, and shortens the penetration depth of the lower recirculation zone. It is also helpful to increase the temperature of molten mold flux at the meniscus by 2-5℃. Larger inclusions are easy to be entrapped by mold slag. The inclusion removing fraction increases with an increase in magnetic field strength when the diameters of inclusions exceed 30 μm.

     

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