电渣炉大电流导体的电磁场数值模拟

Numerical Simulation of Electromagnetic Field Generated Around High Current Conductors of Electro-Slag Remelting Furnace

采用数值模拟的方法研究了电渣炉重熔期大电流导体产生磁场的空间分布规律。利用ANSYS软件包,通过求解磁矢量微分方程,确定了磁感应强度在空间的分布,计算结果与实际测量数据进行了对比。在自耗电极轴向方向上各点的磁感应强度在两端处大并且变化较大,中间磁感应强度最小;磁感应强度的总体趋势是随距离的增加而减弱,但在涡流区域将发生畸变,铁磁体表面的场强随深度增加而降低;在主回路中,各区域磁感应强度由强到弱的顺序为导线区域、电极区域、立柱和横臂区域、结晶器区域。

Spatial distribution of magnetic field generated around high-current conductors during electro-slag remelting was studied with numerical simulation. Using ANSYS software, the spatial distribution of magnetic flux density around the furnace body was simulated. The simulation data were compared with measured ones. It was shown, that along the axial direction of consumable electrode, magnetic flux density was high and changed obviously at two ends, and was the smallest in the middle. Besides, the magnetic flux density was reduced with the distance increasing, but was distorted in eddy current field. Similarly,on the surface of ferromagnetic bodies, the magnetic flux density was reduced with the distance increasing. Around the main circuit, the magnetic flux density was the strongest around high current conductors, then electrode, upright column and cross arm, and the weakest was around crystallizer.