热镀锌中频交流磁场封流温度场模拟

Temperature Field Simulation of Intermediate Frequency Electro-magnetic Sealing in Hot Dip Galvanizing Process

利用ANSYS软件对中频交流封流中锌液的温度分布进行了模拟,采用电磁-热耦合数值分析方法计算了锌液在频率为900,1200,1500Hz和电流密度为4×106,6×106,8×106A/m2条件下的温度分布,分析了锌液温度与电源频率、电流密度、通电时间的关系,结果表明,中频磁场封流过程中,锌液温度因涡流发热升高且分布不均匀,降低电流密度和频率会降低锌液最高和最低温度差和锌液的温升,但需要结合封住锌液的条件来实现中频磁场封流.

The temperature distribution of liquid zinc was simulated in the course of intermediate frequency electromagnetic sealing through ANSYS software. Liquid zinc temperature was calculated when frequency was 900,1200 and 1500 Hz,and current density 4×106,6×106 and 8×106 A/m2 respectively by using electromagnetism-heat coupling method. The relations among liquid zinc temperature,frequency,current density and conduction time were analyzed. The results showed that the temperature of molten zinc increased due to the heat produced by eddy current. Besides,the temperature of molten zinc was quite inhomogeneous in the course of intermediate frequency electromagnetic sealing. The reduction of current density and frequency could decrease the difference between the maximum and minimum temperatures of molten zinc,and decrease the rise of molten zinc temperature. However,the demand of sealing liquid zinc should be considered for successful sealing of zinc in the intermediate frequency electromagnetic field.