多区域独立可控电磁制动对结晶器内钢液非均匀流动与渣金界面行为影响的研究  

Study on the effect of multi area controllable electromagnetic braking on behavior of non-uniform molten steel flow and steel-slag interface in the mold

作　　者：许琳 裴群武 李楠 刘聪 徐鹤源 XU Lin;PEI Qunwu;LI Nan;LIU Cong;XU Heyuan(Shenyang Institute of Engineering,School of Energy and Power Engineering,Shenyang 110136,Liaoning,China;Shenyang Academy of Instrumentation Science Co.,Ltd.,Shenyang 110043,Liaoning,China)

机构地区：[1]沈阳工程学院能源与动力学院,辽宁沈阳110136 [2]沈阳仪表科学研究院有限公司,辽宁沈阳110043

出　　处：《钢铁钒钛》2025年第1期112-123,共12页Iron Steel Vanadium Titanium

基　　金：沈阳市科技人才专项资助项目(RC230046);辽宁省博士科研启动基金项目(2022-BS-224);辽宁省教育厅科研项目(LJKQZ20222282,LJKMZ20221713)。

摘　　要：连铸过程中,因水口堵塞引发的结晶器内部钢液流动畸变是影响铸件质量和生产效率的关键因素之一。为解决此问题,文中提出多区域独立可控电磁制动技术,以改善钢液流态,减少水口堵塞带来的负面影响。首先,选定板坯结晶器作为研究对象,构建电磁连铸结晶器内钢液流动与渣金界面行为分析模型;其次,对比分析无电磁制动、现行全幅一段电磁制动以及多区域独立可控电磁制动作用下,结晶器内部钢液非均匀流动特性与渣金界面的演变规律。模拟结果表明,在单侧水口发生25%堵塞的情况下,相较于全幅一段电磁制动,多区域独立可控电磁制动所产生的制动效应对非堵塞侧结晶器内钢液的流动控制效果更显著。与未施加电磁制动时相比,当施加的磁场强度为0.3 T时,全幅一段电磁制动结晶器内非堵塞侧钢液表面最大流速和界面最大波高分别增加了16.7%和1.6%,而多区域独立可控电磁制动结晶器内非堵塞侧钢液表面最大流速和界面最大波高分别降低了16.7%和48.4%。可见,采用多区域独立可控电磁制动可实现分区域控制结晶器内部钢液流动,从而改善流场的对称性,并减少因水口堵塞引起的流动不对称现象。In the process of continuous casting,the distortion of molten steel flow in mold caused by nozzle clogging is a key factor affecting the quality and production efficiency of castings.To solve this problem,a multi area controllable electromagnetic braking(MAC-EMBr)technology is proposed to improve flow state of molten steel and reduce negative impact of nozzle clogging.Firstly,a slab mold is selected as the research object to establish an analytical model of molten steel flow and steel-slag interface behavior in electromagnetic continuous casting mold.Secondly,the fluid-flow-related phenomena of three casting cases in the slab mold,i.e.,No-EMBr,Ruler-EMBr,and MAC-EMBr,are further investigated numerically to evaluate the metallurgical capability of the MAC-EMBr,including the nonuniform flow characteristics of molten steel and the evolution pattern of steel-slag interface inside the mold.According to the simulation results,with a 25%blockage rate of a single-side nozzle,the braking effect of the Ruler-EMBr on the backflow in the upper region of the mold is not remarkably.In detail,when the magnetic flux density reaches 0.3 T,the maximum magnitude of the surface velocity and the maximum amplitude of the level fluctuation on non-clogging side with the Ruler-EMBr are 16.7%and 1.6%higher than those with No-EMBr,respectively.This is not conducive to the stability of steel-slag interface in the mold.However,under the same magnetic flux density as the Ruler-EMBr,the application of MAC-EMBr has great potential to suppress the upward backflow on the non-clogging side.In comparison with No-EMBr,the maximum magnitude of the surface velocity and the maximum amplitude of the level fluctuation with the MAC-EMBr are decreased by 16.7%and 48.4%,respectively.As a result,the flow of molten steel in the mold can be well controlled in different regions with the MACEMBr,so as to improve the symmetry of the flow field and reduce the flow asymmetry caused by nozzle clogging.

关 键 词：连铸 水口堵塞 电磁制动 钢液流动 渣金界面 

分 类 号：TF777.1[冶金工程—钢铁冶金]