板坯连铸中间包内控流装置优化的物理和数值模拟  

Optimization of flow control device in slab continuous casting tundishusing physical and mathematical simulations

作　　者：常茜萱 谭憧 刘畅 肖爱达 王强 李光强[1,2] CHANG Xixuan;TAN Chong;LIU Chang;XIAO Aida;WANG Qiang;LI Guangqiang(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;LY Steel of Hunan Iron&Steel Group Co.,Ltd.,Loudi 417009,China)

机构地区：[1]武汉科技大学耐火材料与冶金省部共建国家重点实验室,湖北武汉430081 [2]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [3]湖南钢铁集团公司涟源钢铁有限公司,湖南娄底417009

出　　处：《炼钢》2022年第6期29-37,共9页Steelmaking

基　　金：国家自然科学基金钢铁联合基金重点项目(U1860205)。

摘　　要：为优化连铸中间包内钢液的流动形态以有效去除非金属夹杂物,提出了一种带有不同孔径的多孔控流器。以某钢厂70 t两流板坯连铸中间包为原型,搭建1∶4的水力学模型测量RTD曲线,建立三维数值模型分析流场,研究了拉速和控流器安装位置对中间包钢液流动特性的影响,得到最佳控流装置组合。结果表明:安装控流器的中间包内钢液流动状态得到改善,运动轨迹得以延长,钢液平均停留时间增大,死区体积分数减小。当控流器与挡墙间距为150 mm时,安装孔长径比S_(f)=4的控流器效果较佳。拉速分别为1.0、1.2、1.4 m/min时,死区体积分数分别减小了17.42%、15.55%、28.72%,峰值时间分别延长了75、41、56 s,平均停留时间分别延长了78、87、126 s。In order to optimize the flow pattern of molten steel in the continuous casting tundish to effectively remove non-metallic inclusions,a multi-hole flow control device with different apertures was proposed in this study.A 1∶4 hydraulics model experiment was conducted to simulate a 70 t two-strand slab continuous casting tundish to measure RTD curves and a three-dimensional numerical model was established to analyze the flow field.The effects of the casting speed and the installation position of the flow control device on the flow characteristics of the molten steel in the tundish were studied,and the optimal combination of flow control devices was obtained.The results show that the flow rate is improved,the path of the fluid flow can be prolonged,the average resistance time is prolonged and the dead zone volume fraction is decreased.The flow control device of S_(f)=4 has the best effect on improving the flow field when the distance between the flow control device and the weir is 150 mm,and when the casting speed is 1.0,1.2,1.4 m/min,the dead zone volume fraction decreases 17.42%,15.55%,28.72%,the peak time is prolonged by 75,41,56 s,the average residence time is prolonged by 78,87,126 s,respectively.

关 键 词：中间包 控流器 流场 

分 类 号：TF777[冶金工程—钢铁冶金]