工业硅真空感应精炼过程熔体流动行为数值模拟  

Numerical simulation on the flow behaviour of the melts of metallurgical-grade silicon refining in a vacuum induction furnace

作　　者：吕国强[1] 马文会[1,2] 王华[1] 魏奎先[1,2] 杨玺[1] 罗涛[1,2] 薛海洋[1] 

机构地区：[1]昆明理工大学冶金与能源工程学院云南昆明650093 [2]昆明理工大学真空冶金国家工程实验室,云南昆明650093

出　　处：《材料热处理学报》2013年第10期181-186,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51066003,U1137601)

摘　　要：用Multi-physics Comsol软件对工业硅真空感应精炼过程的电磁场和流场进行了数值模拟,定量研究了精炼过程熔池中电磁场和流场动态分布特征。结果表明:磁感应强度集中在线圈高度范围的区域,在径向由表及里衰减;电源输入频率对硅熔体的流场分布和流速都有显著影响,电流密度增大会明显增大搅拌速度;当频率为3000 Hz时,硅熔体表现为先从坩埚内壁向下再由坩埚中心向上隆起然后流向四周的循环流动特征,流场内部存在上下两个涡核,搅拌形成的这种循环流动有利于传热和杂质元素向硅熔体表面迁移和挥发。Numerical simulation of electromagnetic field and molten silicon flow in a vacuum induction furnace for metallurgical-grade silicon refining was carried out by software Multi-physics Comsol,and the electromagnetic field and flow field distribution characteristics in the graphite crucible were investigated. The results indicate that the magnetic flux density is concentrated in the area of coil height range, which attenuates from the crucible outside to inside in the radial direction. The flow patterns and velocity are affected significantly by the current frequency and the stirring velocity is enhanced with the current density increasing in silicon melts. When the frequency is 3000 Hz, silicon melt flow is the cycling flow characteristics which flows down from the inner wall of the crucible and then upward to uplift by the crucible center, then moving around, and there are two clockwise vortex flows in the melt. The silicon melts in this type of flow which is beneficial to the heat transfer and impurity elements migration and volatilization in the vacuum induction refining process.

关 键 词：工业硅 真空感应精炼 速度分布 

分 类 号：TN302[电子电信—物理电子学]