侧壁式感应加热中间包磁/热/流耦合模拟

提出一种新的中间包感应加热方式,建立了三种线圈模型,模拟研究了三种线圈模型的电磁力分布及其对中间包内流场和温度场的影响,并结合RTD曲线评估了最佳线圈模型和加热功率.结果表明:感应线圈向端部移动有利于改善浇注区远端钢液流动形态及温度分布;相同加热功率条件下,U形感应加热线圈优于E形感应加热线圈,且相较于双侧对称分布U形线圈,单侧U形线圈的热效率更佳,冶金效果更好;提高感应加热功率有利于改善钢液的流动和提高铸坯的质量;对于四流中间包,加热功率为800~1 000 kW时,可达到均温补热的效果.

Numerical Simulation of Electromagnetic-Thermal-Hydrodynamic Field in Tundish with Sidewall-Type Induction Heating

A new induction heating method was proposed for tundish and three kinds of side-type electromagnetic induction heaters were designed. The distribution of electromagnetic force of heaters， and its effects on flow field and temperature distribution in tundish were studied by numerical simulation. The optimal heater and heating power was obtained by analyzing the RTD (residence time distribution) curve. The results show that the flow field and temperature distribution of the molten steel in the tundish are improved by moving electromagnetic induction heater towards the end of the tundish. With the same heating power， the heating effect of the U-type heater is superior to E-type heater， and compared with bilateral and symmetrical distribution of U-type heater， the unilateral U-type heater has a better thermal efficiency. Increasing the induction heating power is beneficial to improve the flow of molten steel and improve the quality of the casting. For a four-strand tundish， the heating power of 800~1000kW is enough to compensate the heat loss.