两流T型连铸中间包结构优化.pdfVIP

两流 T 型连铸中间包流体流动控制 钟良才 张 果 鲁碧为 刘锡海 （东北大学钢铁冶金研究所，沈阳 110004 ） 摘 要 在实验室中以 1:2.5 几何相似比建立了两流 T 型中间包钢液流动的物理模型，保持弗鲁德准数相等进行物 理模拟实验。实验结果可知，原方案中间包结构的最小停留时间为 35.00s，峰值时间为 103.75s 左右，平均停留时 间约为273.42s，活塞流体积分率约为 17.88%，死区体积分率为29.53% 。采用湍控器、一堰和两坝作为该中间包的 控流装置，可以大幅度改善中间包的流体流动特性。结构改进后的中间包流体流动特性为最小停留时间达到 151.75s，峰值时间为281.25s，平均停留时间为354.16s，活塞流体积分率为 55.80%，死区体积分率降低到 8.73%。 关键词 连铸 两流 T 型中间包 流动控制 物理模拟 Control of Fluid Flow in a Two-Strand T-Type Tundish for Continuous Casting Zhong Liangcai Zhang Guo Lu Biwei Liu Xihai ( Institute of Ferrous Metallurgy, Northeastern University, Shenyang, 110004) Abstract A two-strand T-type tundish model was set up in laboratory with 1:2.5 scale from a tundish prototype. The physical simulation experiment was conducted with Froude number being equal to each other. The experimental results indicate that in former tundish configuration, the minimum residence time is 35.00s，the peak time 103.75s ，the mean residence time 273.42s ，the plug flow region proportion 17.88% ，and the dead volume fraction 29.53%. The flow characteristics in the tundish with a turbulence inhibitor, a weir and two dams as its flow control devices can greatly be improved. The minimum residence time, the peak time and the average residence time increase to 151.75s, 281.25 s and 354.16s, respectively. The plug flow and dead volume fractions were 55.80% and 8.73%, respectively. Key words continuous casting, two-strand T-type tundish, flow control, physical modeling 1 引言 随着科技水平的发展，在连铸生产过程中，对钢液的温度和成分有了更高要求。这就要求作为连铸工艺 重要环节的中间包必须发挥去除夹杂物、净化钢液的重要作用。主要的措施是在中间包内设置合适的挡墙和 湍流控制器等，使中间包内能够形成合理的流场，以获得最佳的中间包流体流动特性，促使钢液中非金属夹 杂物充分上浮[1～7] 。 本文针对两流 T 型连铸中间包，采用物理模拟的研究方法，主要研究湍流控制器、堰的高