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

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，非金属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10um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，为电磁去除钢液中的非金属夹杂物技术的工业应用提供理论基础。

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

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 (n) 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 (dp). It has been confirmed that the non-metallic inclusion less than 10 um 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.