电磁搅拌对大方坯结晶器流场和液面波动的影响

Effects of electromagnetic stirring on the flow field and level fluctuation in bloom molds

针对260 mm×300 mm大方坯结晶器,采用有限元和有限体积法相结合的方法研究了电磁搅拌对结晶器流场和液面波动的影响.磁场模拟结果与现场实测数据一致.电磁搅拌使结晶器内钢液在水平截面呈旋转流动,在纵截面上形成两对回流方向相反的环流区,最大切向速度随电流和频率的增加而增大,结晶器自由液面的波动随电流和频率的增加而加剧.对于260 mm×300 mm大方坯轴承钢连铸,合理的结晶器电磁搅拌电流和频率分别是300 A和3 Hz.

The effects of electromagnetic stirring on the flow field and level fluctuation were researched for 260mm ×300mm bloom molds by combining the finite element method with the finite volume method. The simulated magnetic field is consistent with measured data in a real plant. Molten steel swirls in the horizontal section and forms two pairs of recirculation zones with opposite circulation directions in the longitudinal section. When the current and frequency increase, the maximum tangential velocity increases, and the level fluctuation of the free surface aggravates. For 260 mm ×300 mm bloom continuous casting of bearing steel, the reasonable current and frequency of mold electromagnetic stirring are 300 A and 3 Hz, respectively.