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Numerical Analysis of Flash Ironmaking Process in a Newly Proposed Counter-Current Downer

  • Computational Modeling of Metallurgical Furnaces
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Abstract

A counter-current downer is proposed as a new structure to improve the flash ironmaking technology (FIT). A computational fluid dynamics (CFD) model was established to predict the dilute gas–particle reacting flow, and a core–annulus structure was observed. Furthermore, counter-current and cocurrent downers have been compared in similar conditions. As a result, reduced iron of the counter-current downer had a higher reduction degree (99.8%) than that of the cocurrent downer (70.1%). The first two reaction steps (Fe2O3 → Fe3O4 and F3O4 → FeO) were swift, while the subsequent step (FeO → Fe) in the counter-current downer showed a significant difference due to the preponderant reduction potential and temperature. Different gas velocities (0.167–0.667 m/s) were also investigated, and the high-speed gas flow brought more particles with decreasing metal yield from 89.3% to 27.5%. However, more gas amounts always led to a higher reduction degree separately of captured and escaped particles.

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Acknowledgements

The authors acknowledge the financial support from the China Postdoctoral Science Foundation, No. 2021TQ0108, and Fundamental Research Funds for the Central Universities, No. JKB01211715. The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai, 200237, People’s Republic of China

    Yiru Yang, Zhongjie Shen, Jianliang Xu & Haifeng Liu

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  1. Yiru Yang
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Yang, Y., Shen, Z., Xu, J. et al. Numerical Analysis of Flash Ironmaking Process in a Newly Proposed Counter-Current Downer. JOM 74, 1499–1508 (2022). https://doi.org/10.1007/s11837-021-05003-3

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  • DOI: https://doi.org/10.1007/s11837-021-05003-3

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