Influence of Obstruction at Gas-Injection Nozzles (Number and Position) in RH Degasser Process

Trindade, Luis Carlos; Peixoto, Johne Jesus Mol; Silva, Carlos Antônio da; Baston, Eduardo Prado; Naves, Fabiano Luiz; Neto, Juan Canellas Bosch; Faria, David Tiago de; Lofrano, Renata Carolina Zanetti; França, Alexandre Bôscaro

doi:10.1007/s11663-018-1474-6

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…erefore, it can be Advances in Materials Science and Engineering considered that the gas flow rate corresponding to the contact of bubbles from different nozzles with each other or the contact of bubbles and opposite wall is Q m , max . e bubble is simulated by a complete sphere, and the geometric conditions of this contact state of RH with circular snorkels and RH with arched snorkels are expressed by equations (5) and (6) [10]. Equations (7)-(9) [37] show the calculation formulas of diameter and horizontal penetrating depth of bubble; by combining equations (5) and (6), the Q m , max of the two RH water models can be calculated:…”

Section: Saturated Gas Flowmentioning

confidence: 99%

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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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Section: Saturated Gas Flowmentioning

confidence: 99%

“…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%

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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“…Similar conclusions were obtained by numerical simulations. [22,23] Zhu et al [23] found that the gas holdup distribution is extremely nonuniform for nonsymmetrical nozzle blockage, which leads to a decrease of the circulation flow rate. In addition, the refractory erosion in the up-snorkel is more serious under a nonsymmetrical blockage condition.…”

Section: Introductionmentioning

confidence: 99%

Study on Multiphase Flow Characteristics During RH Refining Process Affected by Nonradial Arrangement of Gas‐Blowing Nozzle

Wang

Zhou

et al. 2023

steel research int.

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Bath stirring, degassing, and decarburization in steel refining are strongly related to flow behaviors. The bubble plume produced in Ruhrstahl–Heraeus (RH) up‐snorkel plays an important role during refining, since it not only acts as a bubble pump, but also provides the reaction interface. Herein, it is aimed to form a new flow pattern in the up‐snorkel by using a nonradially arranged gas‐injection nozzle to enhance the 260 ton RH refining process. The results show that an upward spiral steel flow is produced, when nonradial gas‐injection nozzles are used in the up‐snorkel. Meanwhile, some bubbles moved toward the center region of the up‐snorkel, which may be caused by the centripetal effect in a rotational steel flow. This leads to a more uniform bubble distribution on the cross section of the snorkel, compared to that of the conventional case. Specifically, the circulation flow rate is increased by about 18.0%, and the mixing time are shortened by about 26.2% (criteria of ±5%), compared to that of the conventional case. In addition, the inclusion removal rate is increased by 0.5%, 4.8%, and 11.3% for the inclusion size of 20, 50, and 100 μm, respectively, compared to the conventional radial nozzle case.

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“…With the rapid development in the steel industry, there is increasing demand for highquality steel. Researchers have found that oxide nonmetallic inclusions play an important role in the performance of clean steel [1][2][3]. e removal of inclusions and the control of small inclusions are important factors that directly affect the quality of steel.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Investigation on Inclusion‐Argon‐Liquid Steel Phenomenon in RH Refining of High‐Manganese and High‐Aluminum Steel

Chen

Liu

Han

et al. 2019

Mathematical Problems in Engineering

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Influence of Obstruction at Gas-Injection Nozzles (Number and Position) in RH Degasser Process

Cited by 5 publications

References 10 publications

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

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

Study on Multiphase Flow Characteristics During RH Refining Process Affected by Nonradial Arrangement of Gas‐Blowing Nozzle

Numerical Simulation and Experimental Investigation on Inclusion‐Argon‐Liquid Steel Phenomenon in RH Refining of High‐Manganese and High‐Aluminum Steel

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