Optimization of flow and temperature field in a tundish with gas curtain based on a new-type baffle
A new type of flow control method combined multi-hole baffle with gas bubbling curtain was proposed.The flow field,temperature distribution and RTD curves in a single-strand slab tundish before and after the usage of the new-type baffle were compared and analyzed.Besides,the main parameters of the new-type baffle were discussed and optimized.The results show that the flow field,average residence time,dead zone volume fraction and temperature distribution of molten steel in the tundish equipped with the new-type baffle combined with gas bubbling curtain are better than those of the schemes without baffle,gas bubbling curtain only and new-type baffle only.Compared with the schemes of 40 mm,50 mm and 80 mm,when the diversion hole radius of the new-type baffle is 60 mm,the average residence time of molten steel in the tundish is increased by 2.15-28.7 s,the dead zone volume fraction is decreased by 0.4％-3.1％,the temperature difference between inlet and outlet is decreased by 0.1-0.3 K,the volume of low temperature zone is decreased by 0.07-0.75 m3,and the impact of molten steel on the bottom of the tundish between the two baffles is relatively small.Compared to the schemes of 1040,1 180,1 320 and 1 520 mm,when the gas bubbling curtain located at 840 mm from the center of ladle shroud,the temperature distribution of molten steel in the tundish and the impact steel flow on the bottom of the tundish are with little difference,while the average residence time of molten steel is increased by 6.57-25.39 s,the volume fraction of dead zone is decreased by 0.9％-3.2％.
tundishbafflegas bubbling curtainRTD curvetemperature field
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