连铸长水口吹氩气泡行为的试验研究

Experiment of bubble behavior in argon blowing through long shroud of continuous casting

通过连铸长水口吹氩冷态试验,研究了不同吹氩条件下获得的小气泡的尺寸、分布以及气泡在中间包的流动行为。试验结果表明,低水流量(≤2.4m^3/h)时,孔径0.11mm气嘴产生微小气泡(0.1~0.5mm)比例最大达到60%以上,孔径0.25 mm气嘴微小气泡比例达到45%,孔径0.58 mm气嘴在35%左右。孔径0.11mm气嘴气泡直径主要在0.1~1.0mm,孔径0.25mm和孔径0.58mm气嘴的气泡直径主要在0.1~1.5mm,而0.58mm气嘴产生较大气泡(>1.0mm)比例较多。直径0.25mm单孔气嘴和双孔气嘴在水量为3.0m^3/h时,形成的微小气泡(0.1~0.5mm)比例均达到80%以上。在较低水量(≤2.4m^3/h)下,这两种气嘴形成的微小气泡比例相近,但直径0.25mm双孔气嘴比直径0.25mm单孔气嘴产生的较大气泡(>1.0mm)比例要小且气泡数量多。在无湍控器的中间包中气泡的作用区域比有湍控器的大。

Gas bubbles＇ size,their distribution and flow behavior in tundish have been investigated at different conditions of argon blowing through long shroud in continuous casting in water model experiments.The experimental results show that in the lower water flowrate range（≤2.4 m^3/h）,0.11 mm diameter gas nozzle produces above 60 % proportion of tiny bubbles（0.1-0.5 mm）,0.25 mm diameter gas nozzle 45 %,and 0.58 mm diameter nozzle about 35 %.The proportion of larger bubbles（〉1.0 mm）produced with the 0.58 mm diameter gas nozzle is maximal.The proportion of tiny bubbles（0.1-0.5 mm）formed with a 0.25 mm diameter single hole nozzle and a diameter 0.25 mm double-hole nozzle is more than 80 % when the water flowrate is 3.0 m^3/h.In the lower water flowrate（≤2.4 m^3/h）,the proportion of tiny bubbles formed with the two nozzles is similar,but the proportion of larger bubbles（〉1.0 mm in diameter）produced with the diameter 0.25 mm double-hole nozzle is smaller than that with the diameter 0.25 mm single hole nozzle and the double-hole nozzle produces larger number of bubbles.The action area of gas bubbles in tundish without a turbulence inhibitor is larger than with a turbulence inhibitor.