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采用有限元软件,研究了连铸470 mm×350 mm大方坯结晶器电磁搅拌电流和频率对磁感应和电磁力分布的影响,并与实测数值进行了对比。研究表明,磁场模拟结果与现场实测数据一致。电磁力在大方坯水平截面上呈周向分布。当电流相同时,随着频率的增加,磁感应强度减小。电磁力随着频率的增加而增加,且随着频率的增加,最大电磁力增加量减小。当频率相同时,随着电流的增加,钢液内的磁感应强度和电磁力都增加。结合数值模拟的具体结果,当电流和频率为550 A、2 Hz时,能起到良好的搅拌效果。同时对钢液流场特性进行了初步研究。
The effects of electromagnetic stirring current and frequency of continuous casting mold of 470 mm × 350 mm on the magnetic induction and electromagnetic force distribution were studied by finite element software and compared with the measured values. The research shows that the simulation results of the magnetic field are consistent with the field measured data. The electromagnetic force is distributed circumferentially on the horizontal section of bloom. When the current is the same, as the frequency increases, the magnetic induction decreases. The electromagnetic force increases with increasing frequency, and as the frequency increases, the maximum increase of electromagnetic force decreases. When the frequency is the same, as the current increases, the magnetic induction and the electromagnetic force in the molten steel increase. Combining with the concrete results of numerical simulation, good stirring effect can be achieved when the current and frequency are 550 A and 2 Hz. At the same time, a preliminary study on the characteristics of the liquid flow field was carried out.