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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 similar principle, a 1: 3 water model was established to study the second-rate slab continuous casting tundish in a steel mill. The optimization test on the size and location of dam openings shows that the average residence time first increases and then decreases with the increase of the pore diameter, and the average residence time is the longest when the diameter is about 90-120 mm. The height of the holes and the bottom of the holes and the bottom of the dam Distance together affect the average dwell time and dead zone ratio of the molten steel in the tundish. Generally, the small hole height is more favorable to improve the flow field. Adding a small dam on the foundation of the dam can not effectively prolong the liquid steel in the middle But the higher dams can effectively increase the stagnant time of the molten steel. The average dwell time of the improved tundish increased 40 s compared with that of the prototype tundish, and the volume of the dead zone decreased from 19.5% to 9.0%.