方坯软接触电磁连铸结晶器内钢液磁场分布数学模型  

Mathematical model of magnetic field distribution of molten steel in soft-contact electromagnetic continuous casting mold of billet

作　　者：刘少寒 韩毅华 朱立光 LIU Shaohan;HAN Yihua;ZHU Liguang(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China;Hebei HighQuality Steel Continuous Casting Engineering Technology Research Center,Tangshan 063000,Hebei,China;School of Material Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]河北省高品质钢连铸技术创新中心,河北唐山063000 [3]河北科技大学材料科学与工程学院,河北石家庄050018

出　　处：《钢铁研究学报》2021年第12期1260-1269,共10页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51974132,51774141,51604119)。

摘　　要：通过构建方坯软接触电磁连铸结晶器内钢液磁场分布的数学模型,研究了钢液内磁场分布不均的特性,模拟了结晶器内不同切缝形式、磁场频率及液面高度等参数在渣膜存在的条件下对结晶器内钢液磁场分布的影响规律,并进行了模型验证。结果表明,铜壁对磁场的反射作用导致了切缝内的磁场叠加现象。渣膜的存在有利于改善钢液内磁场的均匀性。切缝应设计为下窄上宽型,尽量保持切缝长度在180~200 mm、宽度在0.8~1.0 mm,并多开切缝。磁场频率升高不利于钢液内磁场的均匀性,应尽量保持在20~30 kHz。钢液面升高有助于改善钢液内磁场的纵向均匀性,合理的液面应尽量控制在线圈中心偏上位置。A mathematical model of magnetic field distribution in molten steel was established based on the billet soft-contact electromagnetic continuous casting mold. The model was used in studying the characteristics of uneven magnetic field distribution and simulating the influence of different cutting slit forms, magnetic field frequency and liquid level height on the magnetic field distribution in molten steel with the slag film, and the results were verified. The results show that the reflection of the copper wall on the magnetic field results in the superposition of the magnetic field in the slit. The existence of slag film can improve the uniformity of magnetic field in molten steel. The cutting seam should be designed as narrow at the bottom and wide at the top. The length and width of the cutting seam should be controlled at 180-200 mm and 0.8-1.0 mm, and more cutting seams should be opened. The increase of magnetic field frequency is not conducive to the uniformity of magnetic field in molten steel, so it should be kept at 20-30 kHz as far as possible. The increase of liquid steel level is helpful to improve the longitudinal uniformity of magnetic field in liquid steel. The reasonable liquid level should be controlled as far as possible in the upper position of coil center.

关 键 词：软接触 电磁连铸 结晶器 磁场分布 数学模型 

分 类 号：TF777.14[冶金工程—钢铁冶金]