控流装置对中间包流场影响的水模型研究

Study on effect of flow control devices on flow field in tundish by water modeling

以相似原理为基础,建立1∶3的水模型,对某钢厂二流板坯连铸中间包进行研究。对挡坝孔大小及位置优化试验表明,随孔径的增加,平均停留时间先增加,后减小,孔径为90~120 mm左右时,平均停留时间最长;孔高和孔底与挡坝底部距离共同影响钢液在中间包内的平均停留时间和死区比例,总体来讲孔高较小对改善流场更有利,在挡坝的基础上添加小挡坝并不能有效延长钢液在中间包停留时间,但较高的小挡坝能有效增加钢液的滞止时间;优化后中包较原型中间包平均停留时间增加40 s,死区体积由原来的19.5%下降至9.0%。

Based on the similarity principle, a water model of 1：3 has been established, a two strands slab continuous casting tundish of one iron and steel works was studied. Optimization experiment of hole size and location of dam was studied, it is concluded that, with the increase of the hole size, the average residence time first increases, then decreas- es, when hole size was about 90-120 ram, the average residence time was the longest; The average residence time and the proportion of dead zones of molten steel in tundish was influenced by the height of hole and the distance from hole to the bottom of dam, small hole height has advantage to the improvement of flow field; the average residence time of mol- ten steel in tundish was not increased effectively when a small dam was added on the basis of retaining dam, but stagna- tion time of molten steel increase when the larger height small dam was added. When the optimized ttmdish was used, average residence time of molten steel in tundish increased by 40 sonds, and dead zone volume fell from 19.5% to 9.0% compared with prototype tundish.