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Open AccessArticle

Mixing Phenomenon and Flow Field in Ladle of RH Process

1
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Engineering Research Institute, University of Science and Technology Beijing, No.30 Xueyuan Road, Haidian District, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 886; https://doi.org/10.3390/met9080886
Received: 14 July 2019 / Revised: 8 August 2019 / Accepted: 13 August 2019 / Published: 14 August 2019
(This article belongs to the Special Issue Refining and Casting of Steel)
Particle image velocimetry (PIV) system was adopted to investigate the relationship between the mixing phenomenon and the flow field of a 210 t RH degasser by a 1:4 scale water model. The results of mixing simulation experiments indicated that the mixing time decreased with the increase of gas blowing rate. However, with the increase of Snorkel immersion depth (SID), the mixing time presented a decreasing rend firstly and then increased. The measurement of flow fields of RH ladle by PIV system can explain the phenomenon above. According to the characteristics of the flow field in RH ladle, the flow field can be divided into the mixing layer, the transition layer, and the inactive layer. On the one hand, the stirring power in RH ladle and vacuum chamber both increases with more gas blowing rate, leading to the decrease of mixing time. On the other hand, with SID increases from 400 mm to 480 mm, the gas blowing depth increase results in the mixing power increases, and the mixing time decreases at the beginning. Because of too much-molten steel in the vacuum chamber and the expanding of the inactive layer in RH ladle, however, the utilization rate of the gas driving force begins to decrease. Therefore, the mixing time started to increases with the increase of SID. View Full-Text
Keywords: RH degasser; physical Simulation; mixing Time; PIV; flow field RH degasser; physical Simulation; mixing Time; PIV; flow field
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Zhang, K.; Cui, H.; Wang, R.; Liu, Y. Mixing Phenomenon and Flow Field in Ladle of RH Process. Metals 2019, 9, 886.

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Metals, EISSN 2075-4701, Published by MDPI AG
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