电磁过滤钢液中非金属夹杂物的运动速度和去除效率的理论分析  

THEORETICAL ANALYSIS OF VELOCITY AND REMOVAL EFFICIENCY OF NON-METALLIC INCLUSIONS IN MOLTEN STEEL BY ELECTROMAGNETIC FILTRATION

作　　者：许振明[1] 李天晓[1] 周尧和[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200030

出　　处：《金属学报》2001年第4期423-428,共6页Acta Metallurgica Sinica

基　　金：中国博士后基金;高等学校博士点专项科研基金资助项目

摘　　要：电磁过滤原理是根据非金属夹杂物与熔体导电性的差异，在电磁场作用下非金属夹杂物与熔体的运动规律不同，使非金属夹杂物与熔体分离．经流体力学分析、采用柱塞流及轨线模型研究电磁过滤水平流动钢液中非金属夹杂物的运动速度和去除效率．结果表明，非金用夹杂物的去除效率随着熔体流速（ｕ）和过滤器的高度（２ｈ）的降低而增加；随着电磁力（ｆ）、电磁力作用区长度（ｘ）和非金属夹杂物的粒径（ｄｐ）的增加而增加．经分析表明，采用电磁过滤法可有效去除粒径小于１０ ｍ的非金属夹杂物，该模型可用来设计过滤器的结构和确定电磁过滤工艺参数。The principle of the electromagnetic filtration is that under the action of EMF (electromagnetic force) the non-metallic inclusions with low electrical conductivity move in the direction opposite to that of the EMF. By hydromechanics analysis, the moving velocity of non-metallic inclusions and the removal efficiency from horizontal flowing molten steel by electromagnetic filtration have been studied using piston model and trajectory model. The removal efficiency of the non-metallic inclusion (eta) increases with the reduction of the melt velocity (u), the height of the filter (2h), the increment of EMF, operating distance of electromagnetic force (x) and inclusion size (d(P)). It has been confirmed that the non-metallic inclusion less than 10 mum can be removed efficiently. Theoretical analysis can be used to direct the design of filter structure and confirmation of technological parameters. This new technique is high efficient as compared with general filtration methods, which offers a possibility for production of high clean molten steel.

关 键 词：钢液 电磁过滤 非金属夹杂物 去除效率 运动速度 

分 类 号：TF703[冶金工程—钢铁冶金]