挡墙设计对四流T型中间包钢液流动行为的影响

挡墙设计在T型中间包流场控制方面扮演着重要角色。以某钢厂四机四流T型中间包为研究对象,采用水模拟“刺激-响应”的试验方法,对比研究了不同导流孔的挡墙对中间包内钢液流动模式和各出口一致性的影响规律。研究结果表明,中间包现有结构下的死区处于较低水平,存在远流与近流响应时间差别较大的现象,且流量的增加会恶化中间包钢液的混匀效果。优化方案通过减小导流孔的直径并设计向上45°的倾角,在中间包内产生了较大的环流结构,延长了近流出口的响应时间,活塞区比例从6.61%增加到了9.04%;各流的一致性指数从22.8降低到了9.6,降幅为58%,死区比例也略有减少,有利于改善中间包的整体冶金效果。

Effect of wall design on fluid flow inside a four-strand T-type tundish

The design of retaining wall plays an important role in fluid control of T-type tundish. In this paper, the influence of retaining walls with different diversion holes on the mixing of molten steel and the consistency of each outlet in a four-strand tundish of a steelmaking plant were studied by using the experimental method of “stimulus-response” hydraulic simulation. The results show that the ratio of dead zone is at a relatively low level under the prototype tundish, and there is a big difference between the response time of far outlet and near outlet, and the flow pattern of liquid steel will deteriorate with the increase of flow rate. By reducing the diameter of the diversion hole and designing an upward angle of 45°, the optimized scheme produces a large circulation structure inside the tundish and prolongates the response time of the near flow outlet, which brings forth the increase of plug volume from 6.61% to 9.04%. The consistency index of each outflow is reduced from 22.8 to 9.6 by 58%, and the dead zone ratio is slightly reduced, which is conducive to improving the overall metallurgical performance of the tundish.