Periodic flow characteristics during RH vacuum circulation refining

Ai, Xingang; Bao, Yanping; Jiang, Wei; Liu, Jianhua; Peng-huan, LI; Tai-quan, LI

doi:10.1007/s12613-010-0103-4

Cited by 18 publications

(12 citation statements)

References 2 publications

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“…The yield of ferrotitanium after the addition into molten steel in RH de-gasser is determined by many factors, such as oxygen content in molten steel after final deoxidation, oxidability of slag, physicochemical properties of ferrotitanium itself. The flow of molten steel in RH de-gasser is severe, 16,17) which has a great influence on melting and motion of ferrotitanium. Both melting time and motion trajectory of ferrotitanium will affect its yield.…”

Section: Effect Of Size Of Ferrotitanium On the Melting Behavior And mentioning

confidence: 99%

Effect of Size of Ferrotitanium on the Melting Behavior and the Yield in the Refining of Interstitial Free Steel by RH De-gasser

et al. 2018

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Section: Effect Of Size Of Ferrotitanium On the Melting Behavior And mentioning

confidence: 99%

Effect of Size of Ferrotitanium on the Melting Behavior and the Yield in the Refining of Interstitial Free Steel by RH De-gasser

et al. 2018

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“…In order to reduce costs, many researchers are very concerned about improving the refining efficiency of RH equipment. It is generally considered that the circulation flow rate [5][6][7][8][9][10] and the mixing time [11][12][13][14][15][16] are two significant parameters during the RH process.…”

Section: Introductionmentioning

confidence: 99%

“…It is generally accepted that the circulation flow rate of RH is related to the injected gas flow rate and the section size of snorkel. From process parameter improvement view, many researches have proved that a higher gas flow rate [5,7,29,30,34], a lower vacuum pressure [18,19,28], a deeper insertion depth of snorkel [3,14] would favor to optimize the fluid flow of RH. However, the circulation rate will reach a saturated value with the gas flow rate increasing [14,36].…”

Section: Introductionmentioning

confidence: 99%

Physical Simulation on Molten Steel Flow Characteristics of RH Vacuum Chamber with Arched Snorkels

Ren

Luo

Meng

et al. 2020

Advances in Materials Science and Engineering

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The RH vacuum refining technology is a vitally powerful method of producing clean steel. The inner diameter of traditional circular snorkel is very difficult to be increased owing to the metallurgical refractory thickness around the snorkels and the limitation of the area under the vacuum chamber, limiting the increase in refining efficiency. In order to improve the refining efficiency of the RH reactor, a new designed RH degasser with an optimized arched snorkel is established. This design replaces the traditional two circular snorkels structure with the two arched snorkels and greatly enhances the cross-sectional area of snorkel. In this study, the flow characteristics of this new type RH were studied and analyzed by establishing a 1 : 5.5 physical model of RH with arched snorkels. Results show that the circulation flow rate of RH with arched snorkels can increase by 100% ∼ 180% and the mixing time approximately decreases by 35% compared with RH with circular snorkels under actual production conditions. The circulation flow rate of RH with arched snorkels continues to increase obviously when gas flow rate exceeds the saturated value of RH with circular snorkels. The RH with arched snorkels can increase the refining efficiency significantly and has important application prospect.

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“…Besides, the development of continuous casting also requires the matching of high refining efficiency. It has been proven [1][2][3][4][5] that Ruhrstahl-Heraeus (RH) vacuum refining, an important technology to improve product quality, reduce cost, and expand variety, has become the most widely used refining equipment in the world.…”

Section: Introductionmentioning

confidence: 99%

Mixing Phenomenon and Flow Field in Ladle of RH Process

Zhang

Cui

Wang

et al. 2019

Metals

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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.

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Periodic flow characteristics during RH vacuum circulation refining

Cited by 18 publications

References 2 publications

Effect of Size of Ferrotitanium on the Melting Behavior and the Yield in the Refining of Interstitial Free Steel by RH De-gasser

Effect of Size of Ferrotitanium on the Melting Behavior and the Yield in the Refining of Interstitial Free Steel by RH De-gasser

Physical Simulation on Molten Steel Flow Characteristics of RH Vacuum Chamber with Arched Snorkels

Mixing Phenomenon and Flow Field in Ladle of RH Process

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