两流中间包控流装置优化的物理模拟与应用

Physical simulation and application of flow control devices optimization in two-strand tundish

以太钢两流对称板坯连铸中间包为研究原型,采用物理模拟的方法研究抑湍器以及挡墙、挡坝位置对中间包流场的影响。物理模拟结果表明,中间包未设置任何控流装置时存在短路流,死区比例高达36.47%;中间包使用抑湍器后,响应时间增加了13.5 s,平均停留时间延长了34.8 s,死区体积降低了6.33%;保持挡墙的位置不变,将挡坝距长水口的距离增加100 mm,更利于改善中间包流场。通过现场试验表明,中间包优化后铸坯全氧质量分数由平均2.02×10-7降低至1.55×10-7,减少了30.32%。

Based on the prototype of the two-strand slab continuous casting tundish in TISCO,physical simulation method was used to study the effect of turbulence inhibitor and the position of weirs and dams on flow field of liquid in tundish.Results of physical simulation show that the short-circuit flow exists in tundish without flow control device,and dead zone ratio is as high as 36.47%.After the turbulence inhibitor is used,the response time is increased by 13.5 s,the average residence time is extended by 34.8 s,and the dead zone ratio is reduced by 6.33%.It is more beneficial to improving the flow field in the tundish by increasing the distance of the dams from the long nozzle by 100 mm with keeping the position of the weirs unchanged.Field tests have shown that after tundish optimization,the total oxygen content of casting billet is reduced from an average of 2.02×10-7 to 1.55×10-7,and reduced by 30.32%.