Abstract: Water modeling test for a 25 t four-strand tundish with bottom blowing gas has been carried out by using porous plug with different performance parameters and combined with RTD curves and standard deviation analysis to study the effect of porous plug area (210 ~ 105 mm x 56 ~28 mm), 4 gas blowing location and gas rate (60 ~ 120 L/h) on characteristics of fluid flow in tundish and compare with that without bottom blowing gas. Results show that with using bottom blowing gas, the flow characteristics of liquid steel in tundish are improved to balance the residence time of liquid steel at different outlet, prolong the peak concentration time and reduce the dead volume fraction. Gas blowing location near baffle, using smaller gas flow rate and smaller area of porous plug are available to improve the characteristics of fluid flow field of present tundish.

摘要： 采用不同参数的多孔透气砖进行了25 t四流中间包的底部吹气水模拟实验,结合RTD曲线和标准差分析,研究透气砖面积(210～105 mm×56～28 mm) 、4种吹气位置和吹气量(60～120 L/h)对中间包液体流动特性的影响,并与不吹气的情况进行了对比。结果表明,中间包吹气能改善液体的流动特性,均衡其在不同水口间的停留时间,并能延长峰值时间和降低死区体积。透气砖靠近挡墙,采用小气量和小面积更有利于改善现有中间包流场。

关键词: 中间包, 吹气, 透气砖, 水模拟