Structural optimization and dead volume model of six-flow symmetric tundish
LI Youmei1, CHENG Guoguang1, MIAO Zhiqi1, DAI Weixing1, REN Qingxue2, SHU Youliang2
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 2. Electric Furnace Plant, Baoshan Iron and Steel Co.,Ltd., Shanghai 201900,China
Abstract：In order to optimize the flow field and promote the floating of inclusions, a six-flow T-shaped symmetrical tundish in a steel plant was taken as the object and the combined method of water model and numerical simulation was used to study the flow field characteristics of the tundish, and a dead volume model was established to characterize the flow of molten steel in the tundish, and propose improvement plans in a targeted manner. The results show that the prototype tundish has defects such as short molten steel residence time, inactive edge nozzles, and a dead zone volume fraction of up to 30.9%. There are a large number of “kinetic energy invalid zones” in the pouring process. It is optimized by adjusting the upward angle of the diversion holes of the U-shaped retaining wall. After optimization, the velocity distribution of the molten steel in the tundish is more uniform, the actual average residence time increases by 10.5 s, and the dead zone volume fraction decreases by 13.3%. The “kinetic energy invalid area” of the tundish is greatly reduced, the flow consistency of the nozzle is improved, and the overall mixing effect of the tundish is improved.
LIU C, REVILLA R I, ZHANG D W, et al. Role of Al2O3 inclusions on the localized corrosion of Q460 NH weathering steel in marine environment[J]. Corrosion Science, 2018, 138: 96.
LIU C, REVILLA R I, LIU Z, et al. Effect of inclusions modified by rare earth elements (Ce, La) on localized marine corrosion in Q460 NH weathering steel[J]. Corrosion Science, 2017, 129: 82.
JHA P K, RAO P S, DEWAN A. Effect of height and position of dams on inclusion removal in a six strand tundish[J]. ISIJ International, 2008, 48(2): 154.
[11]
YUE Q, ZOU Z S, HOU Q F. Aggregation kinetics of inclusions in swirling flow tundish for continuous casting[J]. Journal of Iron and Steel Research International, 2010, 17(5): 6.
[12]
WANG M, ZHANG C J, LI R. Uniformity evaluation and optimization of fluid flow characteristics in a seven-strand tundish[J]. International Journal of Minerals, Metallurgy, and Materials, 2016, 23(2): 137.
LI D X, CUI H, LIU Y, et al. A new method based on the f-curve for characterizing fluid flow in continuous casting tundishes[J]. Metallurgical and Materials Transactions B, 2016, 47(2): 1237.
[16]
SAHAI Y, EMI T. Melt flow characterization in continuous casting tundishes.[J]. ISIJ International, 1996, 36(6): 667.
de SOUSA ROCHA J R, de SOUZA E E B, MARCONDES F, et al. Modeling and computational simulation of fluid flow, heat transfer and inclusions trajectories in a tundish of a steel continuous casting machine[J]. Journal of Materials Research and Technology, 2019, 8(5): 4209.
2023, Vol. 42 
