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Physical modelling on optimization of flow behaviors in a two-strand tundish by gas curtain |
TIAN Bao-sheng1, FANG Qing2, WANG Jia-hui2, WU Xian-min1, HUO Li-qiao1, ZHANG Hua2 |
1. Hebei Hot Rolled Plate and Strip Technology Innovation Center, Xingtai 054009, Hebei,China; 2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China |
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Abstract The installation position and gas blowing rate of gas curtain are the key parameters to improve cleanliness of molten steel in tundish. Taking a double-flow slab tundish as the research object,the flow field and residence time distribution (RTD) curves in a two-stand slab tundish of a steelmaking plant with and without gas curtain were analyzed by water model experiments, and the effects of installation position and gas blowing rate on flow behaviors in the tundish were comparatively investigated. The results showed that after the tundish was equipped with gas curtain, the average residence time of molten steel appears no significant change, while the dead zone volume fraction decreases from 14.58% to 5.32%, which is beneficial to the mixing of molten steel. The installation position and gas blowing rate of gas curtain has a significant effect on the dead zone volume fraction of the tundish, but have less effect on the average residence time. The optimal installation position for the gas curtain is 500 mm away from the submerged entry nozzle (SEN), by which the dead zone volume faction is 5.32%, compared to the cases of 600 mm, 700 mm and 800 mm away from the SEN, the dead zone volume fraction is reduced by 1.66%, 1.62% and 0.87%, respectively. The optimal gas blowing rate is 0.4 m3/h, compared to the cases with gas blowing rate of 0.5 m3/h and 0.6 m3/h, the dead zone volume fraction is reduced by 2.8% and 1.11%, respectively. The mean value of total oxygen and the proportion of single class inclusions above grade 1.0 decreased by 9.5% and over 20%, respectively.
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Received: 09 September 2022
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