八流方坯连铸中间包结构优化研究

采用1:3水模型实验对钢厂的八流150 mm×150 mm坯连铸不同控流结构80 t中间包内钢液流场进行了研究,并通过数值模拟进行验证。研究结果表明,中间包仅加湍流抑制器后对改善钢液的流动效果不明显,加上"V"型挡墙后能明显改善各流流动特性,湍流抑制器、"V"型挡墙和单坝组合能进一步提高各流的流动特性一致性,平均停留时间增大到505.22 s,在挡坝的两侧分别形成了明显的环流区。将单挡坝改为双挡坝后,V_p/V_d平均由原来1.77提高到2.63,死区比例平均也减少了6.0%,且各水口的稳定性最好,各流RTD曲线吻合度也最好,且存在3个大环流区和1个小环流区,水模型实验与数值模拟结果一致。

A Study on Optimization of Structure of Eight-Strand Tundish for Billet Concasting

With using 1： 3 water model test the study on flow field of molten steel in an 80 t tundish with different flow control structure for eight strand 150 mm x 150 mm billet casting at steel works has been carried out and is verified by numerical simulation method. Study results show that the improvement of flow effect of molten steel in tundish is not obvious by only adding turbulence inhibitor, but adding "V" type baffle in tundish can obviously improve the flow characteristics of each stand, and the combination of turbulence inhibitor, " type baffle and single dam can further improve the uniformity of flow characteristic of each strand and the average residence time increases to 505. 22 s, in the meanwhile the obvious circulation areas are formed at both sides of the dam. As the single dam is modified to double clam the average V_p/V_d increases to 2. 38 from original 1. 77, the average proportion of dead zone also reduces by 6. 0% while the stability at each nozzle and the coincidence of residence time distribution curves of each strand is best, and there are 3 big circulation areas and a small circulation area. The results of water model test coincide with the results of numerical simulation.