中间包气幕挡墙水模与工业试验研究

Water modeling and industrial trial experiment on argon bubbling curtain in tundish

通过水模型实验和工业试验,研究了中间包底吹氩气对中间包流场和去除铸坯大型夹杂物行为的影响。水模型实验结果表明:中间包底吹气可以改善中间包流场,减少死区体积比,增加平均停留时间。不同实验参数对中间包流体流动特征值的改变程度不同。工业试验结果表明:中间包采用气幕挡墙后,中间包长水口处到铸坯的全氧质量分数降幅提高60.62%;每10kg试样夹杂物总含量由3.85mg降至2.88mg,去除大型夹杂物效果明显,尤其是尺寸小于140μm的夹杂物。

The influence of argon blowing at tundish bottom on flow field in tundish and removal of large-sized inclusions in slab was studied by water modeling and industrial trial. Water modeling results show that flow field could be improved obviously, volume fraction of dead zone decreased and residence time increased by argon bubbling. The flow characteristics could be improved variously under different experimental parameters. Industrial trial results show that argon bubbling curtain in tundish is an effective means to remove large-sized inclusion, especially for the inclusion with diameter less than 140μm. The decrease ratio of total oxygen content from long nozzle zone to slab is increased by 60.62 %. With argon blowing, large-sized inclusions content of slab decreased from 3.85 mg to 2. 88 mg per 10 kg sample.