一种新的旋流连铸技术——电磁旋流水口  

A New Technology of Swirling Flow in Continuous Casting Process: Electromagnetic Swirling Flow in Immersion Nozzle

作　　者：李德伟[1] 苏志坚[1] 丸川雄净[1] 赫冀成[1] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110004

出　　处：《连铸》2013年第4期18-21,共4页Continuous Casting

基　　金：东北大学基本科研业务费资助项目(N100409010);辽宁省高校重点实验室支持计划资助项目(LS2010065);高等学校学科创新引智计划资助项目(B07015)

摘　　要：日本及中国的学者研究表明,在连铸过程中浸入式水口内的旋转流动可以有效改善结晶器内的流体流动状态并提高钢坯的表面和内部质量。笔者提出一种新的旋流连铸技术,即利用水口外的旋转电磁场对钢液的洛伦兹力,使水口内钢液形成旋转流动。对圆形电磁旋流装置作用下圆坯及方坯连铸过程结晶器内钢液流场进行了三维数值模拟,分析了350A电磁旋流作用下圆坯及方坯结晶器内钢液流场。结果表明:①水口电磁旋流使得圆坯结晶器内的钢液都处于旋转状态。②有旋流时,在方坯结晶器角部的附近可以观察到水平流动;钢液的冲击深度更小,上返流增强。The fundamental researches show that, swirling flow in an immersion nozzle can effectively improve the uniformity and stability of the flow from the nozzle, and consequently improve the distribution of flow and tem- perature, reduce meniscus fluctuation in mold. In this study a new process is proposed, in which a rotating elec- tromagnetic stirrer is set up around an immersion nozzle to induce a swirling flow in it by Lorentz force. The flow distribution in mold for round billet and square billet continuous casting process in a round electromagnetic swirling flow generator with 350 A electromagnetic swirling flow is numerically analyzed. The simulation results show that, for round billet, the electromagnetic swirling flow downward from the immersion nozzle can drive all the flow in mold swirling; for square billet, with electromagnetic swirling, a weak swirling flow can be observed at the corner of the meniscus, and the impinging depth of the flow becomes less while the upward flow velocity becomes larger.

关 键 词：连铸 电磁旋流 浸入式水口 结晶器 数值模拟 

分 类 号：TF777[冶金工程—钢铁冶金]