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Effect of Swirl Angle on Interaction between Swirl Oxygen Lance Jet and Melt Pool

Haoran Ma Guangqiang Liu Chengcheng Xu Kun Liu Peng Han

Archives of Foundry Engineering | 2024 | vol. 24 | No 1 | 50-57 | DOI: 10.24425/afe.2024.149251

Keywords Swirl oxygen Melt pool Swirl angle Gas-liquid interface Dead zone

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Abstract

In order to clarify the action law of the swirl oxygen lance jet on the melt pool of the converter and to determine the optimal swirl angle of the swirl oxygen lance for the 120t converter, this study establishes the gas-liquid two-phase flow model of the oxygen lance with different swirl angles based on the realizable k-ε model and the VOF multiphase flow model. The gas-liquid interface behavior during the interaction between the jet and the molten pool was analyzed, and the flow pattern of molten steel in the molten pool was mainly investigated. The results show that compared with traditional oxygen lance, the rotating oxygen lance jet enhances the stirring of the melt pool and intensifies the fluctuation of the melt pool liquid level. The depth of the impact cavity decreases with the increase of the swirl angle, but the diameter of the impact cavity increases with the increase of the swirl angle. When the jet with a swirl angle of 10 ° impacts the surface of the melt pool, the turbulence energy obtained by the molten steel is the highest, the average flow velocity inside the melt pool is the highest, and the molten steel is stirred more thoroughly, achieving better melting effects.

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Bibliography

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Authors and Affiliations

Haoran Ma

Guangqiang Liu

Chengcheng Xu

Kun Liu

e-mail:

ORCID:

Peng Han

College of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 3114051, China
College of Civil Engineering, University of Science and Technology Liaoning, Anshan 114051, China
Cold rolling mill plant, ANGANG Steel Company Limited, Anshan 114021, China

Characterization of High Pressure Water Descaling Jets for Slabs Based on Different Shape Factors

Bowen Yang Guangqiang Liu Chengcheng Xu Kun Liu Peng Han

Archives of Foundry Engineering | 2024 | vol. 24 | No 1 | 121-128 | DOI: 10.24425/afe.2024.149259

Keywords High pressure water Descaling nozzle External jet Conical grooving

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Abstract

The surface temperature of steel billets during hot rolling can reach up to 1200 °C. High temperature promotes rapid oxidation of the surface of steel billets, forming a dense oxide layer similar to fish scales. If not removed in a timely manner, it will damage the surface of the steel billets and exacerbate the wear of the rolls during the descaling process. There are many methods for descaling, but high-pressure water jet has become the main method for descaling due to its excellent descaling performance, low cost, and ease of use. The tip of the descaling nozzle serves as the main component, and its structural parameters affect the final descaling effect. This research changes the shape factor of the nozzle groove curve and the diameter of the nozzle throat, and performs computational fluid dynamics (CFD) simulations on the simplified nozzle external flow field. The axial velocity at the center of the jet generates a velocity peak at 0.5-1 Dc. The peak velocity increases with the increase of shape factor and throat diameter, and the influence of shape factor on the peak velocity is greater. For a constant target distance, the length of the velocity stable section along the jet impact line increases with the increase of the shape factor. The maximum value of dynamic pressure increases, and the smaller the target distance, the greater the dynamic pressure difference. The trend of water volume is roughly the same as that of dynamic pressure.

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Bibliography

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Authors and Affiliations

Bowen Yang

Guangqiang Liu

Chengcheng Xu

Kun Liu

e-mail:

ORCID:

Peng Han

School of Materials and Metallurgy, University of Science and Technology Liaoning, China
School of Civil Engineering, University of Science and Technology Liaoning, China
Cold Rolling Mill Plant, ANGANG Steel Company Limited, China

A film stress measurement system applicable for hyperbaric environment and its application in coal and gas outburst simulation test

Zhong-Zhong Liu Han-Peng Wang Liang Yuan Wei Wang Chong Zhang Yang Xue

Metrology and Measurement Systems | 2021 | vol. 28 | No 1 | 73-88 | DOI: 10.24425/mms.2021.135991

Keywords stress measurement system sealing technology hyperbaric environment coal and gas outburst gas-solid coupling

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Abstract

A film stress measurement system applicable for hyperbaric environment was developed to characterize stress evolution in a physical simulation test of a gas-solid coupling geological disaster. It consists of flexible film pressure sensors, a signal conversion module, and a highly-integrated acquisition box which can perform synchronous and rapid acquisition of 1 kHz test data. Meanwhile, we adopted a feasible sealing technology and protection method to improve the survival rate of the sensors and the success rate of the test, which can ensure the accuracy of the test results. The stress measurement system performed well in a large-scale simulation test of coal and gas outburst that reproduced the outburst in the laboratory. The stress evolution of surrounding rock in front of the heading is completely recorded in a successful simulation of the outburst which is consistent with the previous empirical and theoretical analysis. The experiment verifies the feasibility of the stress measurement system as well as the sealing technology, laying a foundation for the physical simulation test of gas-solid coupled geological disasters.

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Authors and Affiliations

Zhong-Zhong Liu

1 2

Han-Peng Wang

1 2

Liang Yuan

Wei Wang

1 2

e-mail:

ORCID:

Chong Zhang

1 2

Yang Xue

1 2

Shandong University, Geotechnical and Structural Engineering Research Centre, Jinan 250061, Shandong, China
Shandong University, School of Qilu Transportation, Jinan 250061, Shandong, China
Anhui University of Science and Technology, Huainan 232001, Anhui, China

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Effect of Swirl Angle on Interaction between Swirl Oxygen Lance Jet and Melt Pool

Abstract

Bibliography

Authors and Affiliations

Characterization of High Pressure Water Descaling Jets for Slabs Based on Different Shape Factors

Abstract

Bibliography

Authors and Affiliations

A film stress measurement system applicable for hyperbaric environment and its application in coal and gas outburst simulation test

Abstract

Authors and Affiliations