Physical-numerical simulation and application of optimization of flow control device in a single-stand slab tundish
The reasonable structure and layout of flow control devices are crucial for improving the cleanliness of molten steel within the tundish in the continuous casting process.A combined approach using numerical simulation and physical modeling was employed to analyze the steel flow behavior,res-idence time distribution(RTD)curves,and inclusions removal rates for different combinations and posi-tions of flow control devices in a single-strand slab tundish at a certain plant.The results indicate that when the distance between the dam and baffle remains constant,a suitable shift of the baffle wall to-wards the ladle shroud side can prolong the average residence time of the liquid steel by 9.9 s to 17.9 s,reduce the dead zone volume fraction by 0.45 to 0.85 percentage,and decrease the low-temperature re-gion in the tundish,thereby enhancing the purification capability of the molten steel.However,when the distance between the dam and baffle is changed,an excessively large distance between them may cause turbulence in the casting zone of the tundish,with the average residence time of the steel showing no significant extension.Instead,the dead zone volume fraction increases by 0.33 percentage,leading to an enlargement of the low-temperature region in the tundish and a 0.18 percentage increase in the overall inclusion removal rate.Thus,a dam-to-dam distance of 473.5 mm and a baffle-to-ladle shroud distance of 720 mm are considered to be the more ideal combination for flow control device settings.The steel cleanness in the single-strand tundish has been effectively enhance by applying the optimized flow con-trol scheme.
tundishflow control devicephysical and numerical modelingRTD curvesinclusion re-moval
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