偏心M-EMS作用下连铸圆坯流动-传热模拟  

Numerical simulation of flow and heat transfer in a continuous casting round bloom with eccentric M-EMS

作　　者：牛亮 赵俊学[1] 仇圣桃[2] 唐雯聃[1] 杨凌志[3] NIU Liang;ZHAO Jun-xue;QIU Sheng-tao;TANG Wen-dan;YANG Ling-zhi(School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,Shaanxi,China;National Engineering Research Center of Continuous Casting Technology,Central Iron and Steel Research Institute,Beijing 100081,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]钢铁研究总院连铸技术国家工程研究中心,北京100081 [3]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《钢铁》2020年第9期49-56,共8页Iron and Steel

基　　金：国家自然科学基金资助项目(51674185)。

摘　　要：为探究偏心结晶器电磁搅拌(M-EMS)对圆坯钢液流动和传热的作用,减轻偏心M-EMS对圆坯的不利影响,通过建立三维耦合模型研究了偏心M-EMS作用下380mm连铸圆坯钢液流动和传热特点及M-EMS参数的影响。结果表明,在偏心M-EMS(300A/2Hz)作用下,由水口进入结晶器钢液流向外弧侧,碰壁后会形成较大回流;外弧侧钢液温度比内弧侧温度高;随着距弯月面距离增加,外弧侧钢液温度先增加后降低,温度最大处在MEMS中心,为1779K;内弧侧钢液温度则一直降低。随着电流强度由100增加到500A,圆坯下方回流区由1个变为2个;内、外弧侧钢液温差先减小后增加,在300A时最小,为8.4K。随着电流频率由1增加5Hz,外弧侧回流区变小直至消失。当电流频率小于3Hz时,内、外弧侧钢液温差小于10K;而当频率大于3Hz时,温差则大于16K。Ф380mm圆坯推荐M-EMS参数为300A/2Hz。In order to explore the effect of eccentric mold electromagnetic stirring(M-EMS)on the flow and heat transfer of molten steel in continuous casting round bloom and reduce the adverse effect of eccentric M-EMS on round bloom,a coupled three-dimensional mathematic model is established to study the flow and heat transfer characteristics of molten steel in380 mm round bloom with eccentric M-EMS and the effects of M-EMS parameters.The results show that under the action of eccentric M-EMS(300 A/2 Hz):the molten steel entering the mold from the nozzle flows to the external arc side,and a large recirculation zone will be formed after molten steel hitting the arc side;the temperature of molten steel near the external arc side is higher than that near the inner arc side;as the distance from the meniscus increases,the temperature of the molten steel on the external arc side increases first and then decreases,the temperature at the center of the M-EMS is the highest at 1779 K;the temperature of the molten steel on the inner arc side has been decreasing.As the current intensity increases from 100 Ato 500 A,the recirculation zone under the round bloom changes from one to two;the temperature difference of the molten steel on the inner and external arc sides first decreases and then increases,which is the smallest at 300 A,and the temperature difference is 8.4 K.As the current frequency increases from 1 Hz to 5 Hz:the recirculation zone near the external arc side becomes smaller until it disappears.When the current frequency is less than 3 Hz,the temperature difference of the molten steel on the inner and external arc sides is less than 10 K,and when the frequency is greater than3 Hz,the temperature difference is greater than 16 K.The recommended M-EMS parameter for Ф380 mm round bloom is 300 A/2 Hz.

关 键 词：结晶器 电磁搅拌 偏心搅拌 圆坯 温度场 流场 

分 类 号：TF777[冶金工程—钢铁冶金]