蝶式感应加热中间包流场与升温特性

Flow Field and Temperature Rising Characteristics of Butterfly Induction Heating Tundish

针对传统连铸设备中间包钢液入口与浇注口距离近无法安装感应加热装置的问题,设计出一种新型蝶式感应加热中间包,并建立三维非稳态磁-热-流耦合数学模型研究电磁场对蝶式中间包内流场和温度场的影响,得到感应加热功率与升温特性间的关系.结果表明,感应电流在中间包中形成闭合回路且主要集中在通道处.偏心电磁力使得钢液在通道内产生旋流并伴有较大切向速度,流出通道的钢液向浇注室上方运动.中间包过流量为2 t/min时,无感应加热情况下出口温降为7 K,而有感应加热情况下,当加热功率由600 kW增至1000 kW,出口温升由8 K增至27 K.

In order to solve the problem that induction heating device can not be installed in the tundish of traditional continuous casting equipment,a new butterfly induction heating tundish was designed.A three-dimensional unsteady magnetic-thermal-flow coupling mathematical model was then established to study the effect of electromagnetic field on the flow and temperature fields in the butterfly tundish,revealing the relationship between induction heating power and temperature rising characteristics.The results showed that the induced current formed a closed loop in the tundish and was mainly concentrated in the channel.The eccentric electromagnetic force rendered the steel to spin in the channel with large tangential velocity,and the steel flowing out of the channel moved up to the casting chamber.When the flow rate of tundish was 2 t/min and without induction heating,the outlet temperature drop was 7 K.However,under induction heating,when the heating power increased from 600 kW to 1000 kW,the outlet temperature rise was elevated from 8 K to 27 K.