两流T型连铸中间包结构优化

Two-Strand T-type Tundish Configuration Optimization in Continuous Casting

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,保持弗劳德数相等进行物理模拟实验.实验结果表明,原方案中间包结构的最小停留时间为35.00 s,峰值时间为103.75 s左右,平均停留时间约为273.42 s,活塞流体积分数约为17.88%,死区体积分数为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:最小停留时间达到151.75 s,峰值时间为281.25 s,平均停留时间为354.16 s,活塞流体积分数为55.80%,死区体积分数降低到8.73%.

A two-strand T-type tundish model was set up in the 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 results indicated that in the former tundish configuration, the minimum residence time, the peak concentration time, the mean residence time, the plug flow region proportion and the dead volume fraction are 35.00 s, 103.75 s, 273.42 s, 17.88%, 29.53 % ,respectively. 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 concentration time and the average residence time increase to 151.75 s,281.25 s and 354.16 s, respectively in the thundish with the optimization configuration and the plug flow and dead volume fractions are 55.80 % and 8.73 %, respectively.