熔盐电磁感应加热器的数值模拟与分析

NUMERICAL SIMULATION AND ANALYSIS OF ELECTROMAGNETIC INDUCTION HEATER FOR MOLTEN SALT

将电磁感应加热技术应用于低谷电加热熔盐蓄热供暖领域,以熔盐电磁感应加热器为研究对象,利用数值模拟方法研究不同加热条件下感应加热器壁面以及熔盐内部磁场和温度场的分布特点,并得到线圈电流、电流频率、熔盐流速和加热器材料对磁场和温度场的影响规律。研究结果表明:磁感应强度、管道壁面的感应电流密度、加热器壁面温度及熔盐进出口温升随线圈电流的增大而增大,线圈电流频率的升高仅会影响磁场在感应加热器内部的分布;熔盐流速增加时加热器壁面温度和熔盐进出口温升均显著降低,流速分别为0.1和0.4 m/s时所对应的壁面最高温度分别为406和264℃,进出口温升分别为38.79和10.05℃;加热器材料为碳钢时的磁感应强度、感应电流密度、加热器壁面温度以及熔盐进出口温升均大于同等条件下不锈钢材料。

In this paper,the electromagnetic induction heating technology is applied to the molten salt storage heating field with low valley electric heating method,and the molten salt electromagnetic induction heater is taken as the research object. The distribution characteristics of magnetic field and temperature field in the wall of induction heater and molten salt under different heating conditions are studied by numerical simulation method,and the influence of coil current,current frequency,molten salt velocity and heater material on magnetic field and temperature field are obtained. The results show that the magnetic induction intensity,the induced current density on the pipe wall,the temperature on the wall of the induction heater and the temperature rise of molten salt increase with the increase of coil current. The increase of coil current frequency will only affect the distribution of magnetic field. The wall temperature of the induction heater and the temperature rise of the molten salt decrease significantly when the velocity of molten salt increases. The maximum wall temperature of the heater are 406 and 264 ℃,When the velocity of molten salt are 0.1 m/s and 0.4 m/s,respectively,with the temperature rise of molten salt are 38.79 and 10.05 ℃. The magnetic induction intensity,the induced current density,the temperature of the heater wall and the temperature rise of molten salt are higher than that of the stainless steel material when the heater material is carbon steel under the same conditions.