论文部分内容阅读
根据国内某钢厂单流板坯连铸中间包工艺及设备条件,本文利用1∶2水模型研究了挡墙、挡坝位置、挡坝高度以及导流孔倾角对中间包内钢液流动行为的影响。实验结果表明:增大挡墙、挡坝间距,挡坝对钢液流股的抬升作用减弱,挡墙与挡坝间距较小,挡坝高度较高时,挡坝对钢液流股的抬升作用较强,较强的流股抬升作用不利于形成有效的表面流;增大挡墙、挡坝与浸入式水口的距离,中间包内钢液平均停留时间先减小、后增大、再减小,出现峰值现象;增大挡坝导流孔倾角有利于延长钢液在中间包内的停留时间;获得的最优控流装置参数是:挡墙、挡坝间距为450 mm,挡坝距中间包浸入式水口中心距离为1 160 mm,挡坝高度280 mm,挡坝导流孔倾角30°,对应的中间包内模拟钢液平均停留时间为6.23 min,实际的钢液停留时间为8.81min。
According to the single-flow slab continuous casting tundish technology and equipment conditions of a steel mill in China, the 1: 2 water model was used to study the influence of the retaining wall, dam position, dam height and diversion hole inclination on the flow of molten steel in the tundish Impact. The experimental results show that when the distance between the retaining wall and the retaining dam is increased, the lifting effect of the retaining dam on the flow of molten steel is weakened and the distance between the retaining wall and the retaining dam is small. When the height of the retaining dam is high, The effect of strong and strong stream lifting is not conducive to the formation of an effective surface flow. Increasing the distance between the retaining wall and the dam and the immersion nozzle, the average residence time of the molten steel in the tundish first decreases, then increases, and then increases Decrease and peak phenomenon occurs. Increasing the inclination angle of the diversion hole of the retaining dam helps to prolong the dwell time of the molten steel in the tundish. The optimal control flow device parameters obtained are: the distance between the retaining wall and the retaining dam is 450 mm, The distance from the tundish to the center of the tundish is 1 160 mm, the height of the dam is 280 mm and the angle of the guide hole of the dam is 30 °. The corresponding average dwell time of the simulated molten steel in the tundish is 6.23 min. The actual residence time of the molten steel is 8.81min.