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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 magnetic field distribution inside the electromagnetic riser was measured by the experimental method, and the influence of the power supply and the position of the sensor on the distribution was analyzed. The results show that the magnetic induction along the Z-axis shows a trend of “small at both ends and large in the middle”, and the peak appears above the center of the electromagnetic riser. The magnetic induction intensity at the corner obviously overlaps. The magnetic induction along the X and Y axes increases from the center to the end, and the uniformity of the narrow side is slightly better than that of the wide side. With the increase of the power, the magnetic induction in the Z direction increases obviously, but the uniformity decreases, Considering the magnitude and uniformity of magnetic induction in X, Y and Z directions, it is reasonable to select 7.5 k W for the power supply. With the upward movement of the electromagnetic field, the peak position of the magnetic flux density also goes up, but the peak value slightly decreases. To create a stable thermal center at the top of the riser and to prevent the electromagnetic force from entrapping the flux inside the molten steel simulator, the sensor can be raised to a distance of approximately 105 mm from the bottom of the riser.