小方坯连铸结晶器电磁搅拌的数值模拟  

Numerical simulation of mold electromagnetic stirring for square billet continuous casting

作　　者：李建超[1] 崔建忠[1] 王宝峰[2] 麻永林[2] 

机构地区：[1]东北大学材料电磁过程教育部重点实验室,辽宁沈阳110004 [2]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《炼钢》2007年第1期35-39,共5页Steelmaking

基　　金：国家重点基础研究发展规划项目(G199906490501)

摘　　要：借助有限元分析软件ANSYS，对150mm×150mm小方坯连铸结晶器电磁搅拌在电流为150A，频率变化情况下的钢液内部磁感应强度和电磁力进行了数值分析，并分析了结晶器厚度对钢液内部磁场的影响以及不同时刻钢液内部电磁力的分布。模拟结果表明，在结晶器电磁搅拌时，同一个断面上，4个角部的磁感应强度最大；随着频率的增加，钢液内部磁感应强度降低，钢液边部电磁力在4～5Hz时最大；钢液内部的电磁力在1个周期的不同时刻，形成了同一个方向的力偶，在这个力偶的作用下，完成了对钢液的搅拌；结晶器厚度对钢液内部磁场影响很大，厚度增加，钢液内部磁感应强度降低。In electromagnetic stirring the magnetic flux density and magnetic force inside the liquid steel have been numerically calculated and analyzed by means of finite element analytic soft ware ANSYS under the conditions of 150 A current and frequency variation in a 150 mm×150 mm billet continuous caster, and then the effect of mold wall thickness on the magnetic flux density as well as distribution of the magnetic forces in the liquid steel at different time analyzed. Results show that the magnetic flux density at four corners in the same section is the highest one in the process of magnetic stirring, and with the increase of frequencies the magnetic flux density in the liquid steel gradually goes down The magnetic force along the mold reaches the highest at the frequency range from 4 Hz to 5 Hz. At different time in one cycle the magnetic forces in the liquid steel will form the force couples in the same orientation and it is nothing but those magnetic force coupes that accomplish the role of magnetic stirring of the liquid steel. The influence of the mold wall thickness on the magnetic flux density is extremely great and therefore increase of the mold wall thickness will reduce the magnetic flux density in the liquid steel.

关 键 词：数值模拟 连铸 结晶器 电磁搅拌 

分 类 号：TF777.3[冶金工程—钢铁冶金]