7流方坯连铸中间包结构优化

在实验室建立了7流中间包流体流动的物理模型,研究不同的控流装置组成的中间包结构对流体流动特性的影响.研究结果表明,采用原设计的导流隔墙,中间包的流体流动特性差,最小停留时间和峰值时间小,特别是第3,4流.各流的平均停留时间短,死区体积分数大于49%.中间包结构优化后,中间包流体流动特性得到很大改善,各流的停留时间分布曲线由尖窄形变成了宽矮形,最小停留时间在44.75～73.75s之间,平均停留时间延长,均在400s以上,死区体积分数显著降低,在14.45%～21.10%之间.多流中间包应有合适的冲击区体积,设计的控流装置应考虑中间包两端的控流作用.

Optimization of 7-strand Tundish Configuration in Continuous Casting of Billet

A physical model of fluid flow in a 7-strand tundish was developed in laboratory and the influence of tundish configuration with different flow controllers on flow characteristics was investigated. The results showed that the flow characteristics are poor with the previously designed baffles by which the minimum residence time and peak time are both short, especially for the third and fourth strands. For all the strands their average residence time is short with their dead volume fractions higher than 49%. With the optimized tundish configuration, the flow characteristics of molten steel are greatly improved. Residence time distribution curves change from sharp/narrow form to short/wide one, and the minimum residence time of all the strands are measured to be 44.75 to 73.75 s with a mean residence time over 400 s, but the dead volume fraction markedly decreases to 14.45%~21.10%. As to the multi-strand tundishes, they should have suitable impacting zone volume, and the flow control function at both ends of tundish should be taken into account in the design of flow controllers.