连铸结晶器电磁搅拌参数对磁场分布的影响

结合连铸过程的实际情况,采用现场实测与数值模拟的方法,研究了连铸Φ250mm圆坯结晶器电磁搅拌电流和频率对磁感应强度和电磁力分布的影响.研究结果表明,数值模拟计算值与现场实测数据基本一致;当电流相同时,随着频率的增加,磁感应强度减小;沿着结晶器方向,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,但在搅拌器中心对应的径向上,随着频率的增加,电磁力减小;当频率相同时,随着电流强度的增加,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,电磁搅拌电流和频率为480A,3Hz时,能起到良好的搅拌效果.

Effects of Mold EMS Parameters on Distributions of Magnetic Induction and Electromagnetic Force During Continuous Casting

A numerical simulation in combination with in-situ measurement was conducted according to the actual continuous casting process for the M-EMS(mold-electromagnetic stirring) behavior of Φ250 mm bloom. The effects of EMS current and frequency on the distributions of magnetic induction and electromagnetic force were then investigated. The results showed that the simulated results conform basically with the measured data. With the current kept constant and frequency increased, the magnetic induction decreases, and along the centerline in mold, the electromagnetic force increases with frequency though its increment decreases gradually. But, along the radius of electromagnetic stirrer the electromagnetic force decreases with increasing frequency and with the frequency kept constant and current intensity increased, the magnetic induction and electromagnetic force both increase in molten steel. Considering the results of numerical simulation as a whole, the optimal EMS parameters should be as follows: stirring current=480 A with a frequency=3 Hz.