通道式感应加热中间包流场物理模拟研究
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摘要
根据相似原理采用1:2水模型研究了断面为1300 mm×2.2 mm的薄带感应加热连铸中间包内钢液的流动特征。通过测定中间包在有无挡墙条件下,中间包出口处停留时间分布曲线,计算其平均停留时间,死区,活塞区和全混区的体积分数。结果表明,采用上下挡墙的组合方式能有效地改善感应加热中间包内的流场。距离通道出口处380 mm设置高度为100 mm的挡墙,在通道上方设置高度为420 mm的挡墙后,使中间包内的死区体积分数由16.2%降低到5.4%,中间包内钢液的平均停留时间由797 s提高到900 s,短路流现象基本消除。
The 1:2 water model was employed to study the flow characteristics of molten steel in the section of 1 300 mm ×2.2 mm thin strip induction heating continuous casting tundish based on the similarity principle. The average residence time and the volume of dead zone,piston zone and the mixing zone were calculated by measuring the residence time distribution curve of the tundish at the exit of the continuous casting tundish with or without the weir and dam. The results show that the combination of weir and dam can effectively improve the flow field in the induction heating tundish. The dead zone ratio of the tundish flow field is reduced from 16.2% to 5.4%,the average residence time is increased from797 s to 900 s and the short-circuit flow phenomenon is basically eliminated after adding a weir with 420 mm height above the channel,a dam with a height of 100 mm located at the exit of the channel 380 mm.
The 1:2 water model was employed to study the flow characteristics of molten steel in the section of 1 300 mm ×2.2 mm thin strip induction heating continuous casting tundish based on the similarity principle. The average residence time and the volume of dead zone,piston zone and the mixing zone were calculated by measuring the residence time distribution curve of the tundish at the exit of the continuous casting tundish with or without the weir and dam. The results show that the combination of weir and dam can effectively improve the flow field in the induction heating tundish. The dead zone ratio of the tundish flow field is reduced from 16.2% to 5.4%,the average residence time is increased from797 s to 900 s and the short-circuit flow phenomenon is basically eliminated after adding a weir with 420 mm height above the channel,a dam with a height of 100 mm located at the exit of the channel 380 mm.
引文
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[2]李润生,李延辉.中间包钢液等离子加热技术在我国应用中的问题与探讨[J].钢铁,1999,34(1):70.
[3]Wang Q,LI B K,Tsukihashi F.Modeling of a thermo electromagneto hydrodynamic problem in continuous casting tundish[J].ISIJ International,2014,54(2):311.
[4]王强,石月明,李一明,等.感应加热中间包夹杂物的运动及去除[J],东北大学学报:自然科学版,2014,35(10):1442.
[5]Wang Q,Qi F S.LI B K,et al.Behavior of non-metallic inclusions in a continuous casting tundish with channel type induction heating[J],ISIJ International,2014,54(12):2796.
[6]程乃良,朱苗勇.非等温双流连铸中间包内钢液的流动与传热特征[J].钢铁,2001,36(10):23.
[7]彭世恒,王建军,仇圣桃.中间包内非等温流现象研究[J].工程科学学报,2006,28(2):113.
[8]郭庆涛,金俊泽,李廷举.高频磁场电磁净化模拟[J],中国有色金属学报,2005,15(7):1112.
[9]Tripathi A.Mathematical modelling of flow control in a tundish using electro-magnetic forces[J].Applied Mathematical Modelling,2011,35(10):5075.
[10]张广庆,金山同.隧道式感应加热中间罐夹杂物去除及温度分布水模型研究[J],连铸,1998(2):3.
[11]王波,张捷宇,贺友多.中间包钢液非等温现象的水模型研究[J].钢铁研究学报,2004,16(6):11.
[12]萧泽强,彭世恒,程乃良.中间包--一种典型的非等温反应器[J].东北大学学报:自然科学版,2000,21(4):62.
[13]王建军,包燕平,曲英.中间包冶金学[M].北京:冶金工业出版社,2001.
[14]Sahai Y.Tundish technology for casting clean steel:a review[J].Metallurgical and Materials Transactions:B,2016,47(4):2095.