Optimization of flow, heat transfer and inclusion removal behaviors in an odd multistrand bloom casting tundish
The steel flow, heat transfer, and inclusion removal behaviors in a five-strand bloom tundish for five baffles and two types of turbulence inhibitors (TIs) were investigated by a multiphysical model to enhance the consistency among the strands and the purity of molten steel. Water model experiments...
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doaj-370226a7c3944eb98822c1ec11469cbf2020-11-25T03:20:11ZengElsevierJournal of Materials Research and Technology2238-78542020-01-0191347363Optimization of flow, heat transfer and inclusion removal behaviors in an odd multistrand bloom casting tundishQing Fang0Hua Zhang1Ronghua Luo2Chao Liu3Yi Wang4Hongwei Ni5Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China; The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaKey Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China; The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China; Corresponding authors.Valin Xiangtan Iron and Steel Co., Ltd., Xiangtan, 411101, ChinaKey Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China; The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaKey Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China; The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaKey Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China; The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China; Corresponding authors.The steel flow, heat transfer, and inclusion removal behaviors in a five-strand bloom tundish for five baffles and two types of turbulence inhibitors (TIs) were investigated by a multiphysical model to enhance the consistency among the strands and the purity of molten steel. Water model experiments were conducted to verify the simulated results of flow and residence time distribution (RTD). The results showed that the simulated steel flow and RTD curves were basically consistent with those of the experiments. Compared to original conditions, the total residence time reaches 595.0 s, and the volume of the plug region increases by 4.8%, while the volume of dead zone decreases by 0.2% when applying the optimized baffle and TI. In addition, the response and residence times at the 3rd strand increase by 42.5 s and 264.6 s, the total average standard deviation decreases to 0.0057. Meanwhile, the maximum temperature drop decreases from 28.6 K to 22.8 K, and the temperature difference among strands decreases from 3.7 K to 1.4 K. The inclusions removal rate increases by 0.9% to 8.3% with diameters ranging from 10 μm to 100 μm and reaches 94.4% at 100 μm. Furthermore, the qualification rates of flaw detection and nonmetallic inclusions in high rails after optimization increase from 97.94% to 98.73% and from 97.3% to 99.1%, respectively, and the consistency among the strands is apparently enhanced. Keywords: Tundish, Baffle, Turbulence inhibitor, Residence time distribution, Inclusion removalhttp://www.sciencedirect.com/science/article/pii/S2238785419310713 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Qing Fang Hua Zhang Ronghua Luo Chao Liu Yi Wang Hongwei Ni |
spellingShingle |
Qing Fang Hua Zhang Ronghua Luo Chao Liu Yi Wang Hongwei Ni Optimization of flow, heat transfer and inclusion removal behaviors in an odd multistrand bloom casting tundish Journal of Materials Research and Technology |
author_facet |
Qing Fang Hua Zhang Ronghua Luo Chao Liu Yi Wang Hongwei Ni |
author_sort |
Qing Fang |
title |
Optimization of flow, heat transfer and inclusion removal behaviors in an odd multistrand bloom casting tundish |
title_short |
Optimization of flow, heat transfer and inclusion removal behaviors in an odd multistrand bloom casting tundish |
title_full |
Optimization of flow, heat transfer and inclusion removal behaviors in an odd multistrand bloom casting tundish |
title_fullStr |
Optimization of flow, heat transfer and inclusion removal behaviors in an odd multistrand bloom casting tundish |
title_full_unstemmed |
Optimization of flow, heat transfer and inclusion removal behaviors in an odd multistrand bloom casting tundish |
title_sort |
optimization of flow, heat transfer and inclusion removal behaviors in an odd multistrand bloom casting tundish |
publisher |
Elsevier |
series |
Journal of Materials Research and Technology |
issn |
2238-7854 |
publishDate |
2020-01-01 |
description |
The steel flow, heat transfer, and inclusion removal behaviors in a five-strand bloom tundish for five baffles and two types of turbulence inhibitors (TIs) were investigated by a multiphysical model to enhance the consistency among the strands and the purity of molten steel. Water model experiments were conducted to verify the simulated results of flow and residence time distribution (RTD). The results showed that the simulated steel flow and RTD curves were basically consistent with those of the experiments. Compared to original conditions, the total residence time reaches 595.0 s, and the volume of the plug region increases by 4.8%, while the volume of dead zone decreases by 0.2% when applying the optimized baffle and TI. In addition, the response and residence times at the 3rd strand increase by 42.5 s and 264.6 s, the total average standard deviation decreases to 0.0057. Meanwhile, the maximum temperature drop decreases from 28.6 K to 22.8 K, and the temperature difference among strands decreases from 3.7 K to 1.4 K. The inclusions removal rate increases by 0.9% to 8.3% with diameters ranging from 10 μm to 100 μm and reaches 94.4% at 100 μm. Furthermore, the qualification rates of flaw detection and nonmetallic inclusions in high rails after optimization increase from 97.94% to 98.73% and from 97.3% to 99.1%, respectively, and the consistency among the strands is apparently enhanced. Keywords: Tundish, Baffle, Turbulence inhibitor, Residence time distribution, Inclusion removal |
url |
http://www.sciencedirect.com/science/article/pii/S2238785419310713 |
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