矩形电磁冒口内部磁场分布实验研究

Experiment Study of Magnetic Distribution Inside Rectangular Electromagnetic Riser

通过实验方法测定了电磁冒口内部的磁场分布规律,并分析了电源功率和感应器作用位置对其分布规律的影响。结果表明:沿Z轴方向磁感应强度呈"两端小,中间大"趋势,峰值出现在电磁冒口中心偏上位置,拐角处磁感应强度有明显叠加现象。沿X、Y轴方向的磁感应强度均由中心向端部递增,且窄边的均匀性略优于宽边;随电源功率的增加,Z向磁感应强度明显提升,但均匀性有所降低,综合考虑X、Y、Z向磁感应强度大小及均匀性,电源功率选用7.5 k W较为合理;随电磁场作用位置的上移,磁感应强度峰值位置也随之上移,但峰值大小却略有降低。为使冒口顶部形成稳定的热中心,并避免电磁力将保护渣卷入到钢液模拟物内部,可以将感应器升至距离冒口底部105 mm附近位置。

The distribution law of the electromagnetic field inside the riser was studied experimentally, the effect of inductor power and location were also analyzed. The results show that the distribution of electromagnetic field increases from center to both ends along the Z axis. The peak appears at the center, there is an obviously superimposed magnetic induction phenomenon around the corner. Along the X, Y-axis, the magnetization direction is incremented from the center to the ends, and the uniformity of the narrow side is slightly better than the broadside. With the increase of power supply,Z-axis direction magnetic flux density is significantly enhanced but uniformity tended to decrease. Considered X, Y, Z-axis direction comprehensive size and uniformity, the power of 7.5 k W is a more rational selection. Meanwhile, the peak value position of magnetic induction intensity rises along with inductor moving upwards, but the peak value is slightly lower. In order to build a stable hot top and avoid slag powder being involved in liquid steel, the inductor can be fixed in a position which is nearly 105 mm above the bottom of riser.