中频磁场作用下矩形冒口内部钢液磁场分布的模拟研究

Stimulation Study on Magnetic Distribution of Liquid Steel Inside Rectangle Riser Under Intermediate Frequency Condition

通过数值模拟的方法对中频磁场作用下矩形冒口内部钢液的磁场分布规律进行测定,探究了电源频率,感应电流及线圈作用位置对其内部磁场分布的影响。模拟结果表明:钢液内部磁感应强度沿Z向呈"两边小,中间大"分布趋势,磁感应强度峰值出现在中心偏上位置,拐角C处磁感应强度值最大,窄边中心D和宽边中心B次之,钢液中心A位置的磁感应强度值最小;随电源频率的增加,钢液中心位置的磁感应强度峰值不断减小,且频率越高磁感应强度衰减的越严重,但磁场均匀性却不断得到提升;随感应电流的增加,钢液中心位置的磁感应强度峰值几乎呈线性增加,但整体磁感应强度均匀性却在不断降低;随感应线圈位置的上移,钢液中心位置的磁感应强度峰值也随之上移,但其值却略有减少。

The numerical simulation of the magnetic distribution of liquid steel inside rectangle riser under the condition of intermediate frequency were studied, the influence of the power frequency, the induced current and the position of the inducted coil were also changed to explore its internal magnetic field distribution. The results show that the magnetic flux density inside the liquid steel along the Z direction is ＂small at both ends, big in the middle＂, the magnetic flux density peaks appear at the center. The magnetic flux density maximum value is obtained at comer C, the narrow side center D and broad side center B secondly, the minimum value appear at the position of liquid steel center A. With the increase of power frequency, the magnetic induction peak of steel liquid center position decreases, and the higher the frequency, the more serious the magnetic induction decay, but which can promote the magnetic distribution homogeneity. With the increase of the induced current, magnetic induction intensity peak in molten steel central location almost linearly increases, but the overall magnetic flux density uniformity continuously reduces. With the raise of the relative position of induction coil, the peak positions of magnetic induction intensity are also on the move, but the peak value is slightly lower.