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A New Lance Design for BOF Steelmaking

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Abstract

This article summarizes the outcome of research work carried out to improve the performance of the oxygen lance in the LD steelmaking process. It is stated that the lack of control of the foamy slag and the augmentation of interfacial area creation between the slag and metal are the major hindrances in running the process effectively for improved turn-down steel quality. The ineffectiveness of the existing design in producing liquid metal droplets in the presence of slag foam is explained. In order to augment the droplet generation, a new oxygen lance with a central subsonic nozzle through which flow can be controlled has been introduced and its blowing performances studied using numerical and water model studies. The jet characteristics studied in the numerical simulations show no jet coalescence. The interferences of the jets with the bath have further been analyzed by hydrodynamic model studies. It has been found that the droplet generation rate improves significantly due to the presence of the central jet. Further, it has been observed that controlling the flow rate through the central hole can be used as an effective process control tool.

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ACKNOWLEDGMENTS

The authors thank the management of Tata Steel for giving permission to publish this work. They are thankful to all who have directly or indirectly contributed toward making the study at the Institute of Fluid Mechanics (LSTM, Erlangen, Germany). One of the authors (SNL) thanks Mr. Buelant Uensal, who helped during the setup of the LD vessel model.

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Authors and Affiliations

  1. TATA Steel, Jamshedpur, Jharkhand State, India, 831 001

    R. SAMBASIVAM, S.N. LENKA (Researchers), S. CHANDRA (Chief of Technology (Global Wire Business) & S.K. AJMANI (Head of Research Group, Steelmaking and Casting)

  2. LSTM–Erlangen, Institute of Fluid Mechanics, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058, Erlangen, Germany

    F. DURST (Emeritus Professor, former Head)

  3. Saar-Metallwerke GmbH, D-66121, Saarbrücken, Germany

    M. BOCK (Consultant)

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  1. R. SAMBASIVAM
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  2. S.N. LENKA
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  3. F. DURST
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  4. M. BOCK
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  5. S. CHANDRA
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  6. S.K. AJMANI
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Corresponding author

Correspondence to R. SAMBASIVAM.

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Manuscript submitted June 23, 2006.

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SAMBASIVAM, R., LENKA, S., DURST, F. et al. A New Lance Design for BOF Steelmaking. Metall Mater Trans B 38, 45–53 (2007). https://doi.org/10.1007/s11663-006-9004-3

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  • DOI: https://doi.org/10.1007/s11663-006-9004-3

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