圆坯中频电磁软接触连铸结晶器内磁场分布数值模拟

Numerical Simulation of Magnetic Field Distribution in Intermediate-Frequency Soft-Contact Electromagnetic Continuous Casting Mold for Round Billets

用数值模拟方法研究了圆坯中频电磁软接触连铸结晶器内磁场分布,讨论改变结晶器结构参数、工艺参数和电参数等因素对结晶器内磁场的影响。结果表明,结晶器内磁场强度在结晶器高度方向上先增大再减小,在感应线圈中心偏下处,磁感应强度达最大;综合考虑结晶器结构和透磁性,切缝宽度选为0.5 mm,切缝数为8;当自由液面位于感应线圈的中心位置时能获得最大的磁感应强度;随着电流和频率的增加,结晶器内磁感应强度也随着增加。

The method of numerical simulation is used to research the distribution of magnetic field in the intermedi- ate-frequency soft-contact electromagnetic continuous casting mold for round billets, and the changes of magnetic induction intensity along with the changes of structure parameters of mold, processing parameters and electrical parameters are discussed. The results show that in the intermediate-frequency electromagnetic field, the magnetic induction intensity in mold first increases and then decreases, and the B~ is maximum just below the center height of coil. Comprehensively considering the structure and magnetic permeability of mold, the appropriate slit width is 0. 5 mm, and the appropriate slit number is 8, the largest magnetic induction intensity can be obtained when the initial surface of the molten steel is at center height of the coil, and the magnetic induction intensity in mold increa- ses with the increase of induction current intensity and frequency.