通道式感应加热五流中间包流场的水力学模拟

 通道式感应加热能有效补偿连铸过程中间包钢水的温降,且具加热效率高、设备简单等优点,是近年来得到快速推广应用的中间包新技术。配置感应加热器后的中间包结构与常规中间包差异较大,其加热通道的设计对中间包流场具有明显影响。针对实际应用的某5流直通道感应加热中间包边部流和中间流温差大、钢水浇铸过热度偏高的问题,通过水模拟试验对该中间包流场进行优化,提出了一种新型的分口通道方案。该方案可将中间包的死区比例由原型的29.50%降低到20.33%,钢水平均停留时间较原型延长了40 s。工业试验表明,分口式新型通道设计中间包各流浇铸温度一致性得到改善,其中边部流和中间流的平均温差较原型降低了3.6 ℃,实现了感应加热中间包应用效果的进一步提升。

Water modelling on a five-strand tundish with channel induction heating for better flow field

The channel typed induction heating tundish is one of new technologies adopted by steel industry in the recent years,which shows an effective liquid steel temperature control during continuous casting. For the much different geometry as compared with conventional tundishes,special attention should be given to the control of the fluid flow field with consideration of the presence of heating channels. Aimed at the larger temperature difference between strands and the higher superheat degree observed in a 5strand tundish for special steel casting,a water modelling has been carried out for the optimization of the vessel structure,and a side furcated channel has been invented in the present work. With the improved channel design,the dead zone fraction of the tundish is dropped from 29.50% to 20.33%,and the average residence time is prolonged by 40 s compared with the straight-through prototype channel scheme. Industrial tests show that the temperature difference between the edge strand and the middle strand in the new tundish is 3.6 ℃ lower in average than that of the original channel typed one,which meets the demand of casting production for no obvious temperature difference among the five strands.