通道式感应加热中间包钢液流动特性的数值模拟

通道式感应加热中间包能够有效补偿钢液在浇注过程中产生的温降。钢液流动特性是影响通道式感应加热中间包冶金过程的关键。采用ANSYS软件求解电磁场、流场和温度场控制方程,得到通道式感应加热中间包稳态流场和温度场;在此基础上,求解示踪剂溶质输运方程,得到RTD曲线。数值结果表明,浇注口温度提高20K;相比于无感应加热的通道式中间包,应用通道式感应加热后,总体平均停留时间延长48s,总体死区体积分率缩小为21.5%;通道式感应加热中间包的电磁力对钢液的搅拌作用是影响流动形态的主要因素,焦耳热引起的热对流是影响流动形态的次要因素。

Numerical simulation for flow characteristics of molten steel in tundish with channel type induction heater

The tundish with the channel type induction heating can effectively compensate for the temperature drop caused by the molten steel during the continuous casting process. The flow characteristics of molten steel are the key factor for the metallurgical process in the tundish with channel type induction heater. The commercial software ANSYS is used to solve the governing equations for electromagnetic field, flow field and temperature field. On the basis of the steady-state flow field and temperature field, the solute transport equation of tracer is solved to obtain the RTD curve. The results show that the temperature of the molten steel at the outlet is 20 K more than that at the ladle shroud in the case of the induction heating. Meanwhile, if the channel induction heating is applied, the overall average residence time is extended by 48 s, and the overall dead zone volume fraction is reduced to 21.5%. Meanwhile, in the tundish with the channel type induction heater, the stirring caused by the electromagnetic force is the main factor affecting the flow pattern of the molten steel, and the thermal convection caused by Joule heat is the secondary factor.