Behavior of Gas Bubbles in Swirling Flow Generated by Rotating Magnetic Field in Metallurgical Reactor
1. Introduction Gas stirring is widely practiced in the metallurgical industry for converting, refining,temperature and composition homogenization,and inclusion flotation. The gas can be introduced into a bath of molten metal either through porous plugs, or using nozzles or lances. When the flow rate of gas increases,coalescence of bubbles occurs, rapid rising of the big size bubbles causes a short residence time in bath. The reactor performance is governed by the swirling velocities and residence time. When bubbles contain reactive gases, it is important to avoid high local void fractions otherwise chemical equilibrium is difficult to attain and gas is wasted. In order to improve the utilities of gases,it is necessary to make the fine bubble size,disperse bubbles and prolong the residence time of bubbles. The beneficial effects of the rotating magnetic field in materials processing,especially in continuous casting, have been studied by many investigators. If molten metal in reactor is stirred through swirling motion, particles such as the off-center injection bubbles and nonmetallic inclusions contained in melt, which densities are small compared with that of the metal melt, are moved with metal melt and towards the center area of the reactor because of the difference in the centrifugal force. It increases the collisions and coalescences between the gas bubbles and inclusions, and enhances the removal rate of inclusions.
ladle metallurgy electromagnetic force modeling
Baokuan LI Fengsheng Qi Fang WANG Fumitaka TSUKIHASHI
School of Materials and Metallurgy,Northeastern University Graduate School of Frontier Sciences,The University of Tokyo
国际会议
2008 International Symposium on Clean Steel(2008年洁净钢生产技术学术研讨会)
鞍山
英文
81-84
2008-09-17（万方平台首次上网日期，不代表论文的发表时间）