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Numerical simulation of flow characteristics of side-bottom combined blowing in iron bath reactor

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Abstract

A numerical model of an iron bath smelting reduction furnace with side-bottom combined blowing was established to study the influence of blowing arrangements on the stirring effect of the molten pool, and the accuracy of numerical simulation was verified by water model experiment. By comparing the flow field of molten pool with single nozzle, double nozzles (symmetrical and asymmetrical), and four nozzles (symmetrical and asymmetrical), the proportion of dead zone, average turbulent kinetic energy, and mixing time, the results show that asymmetrical bottom blowing is better than symmetrical bottom blowing, and the effect of double nozzles bottom blowing was better than that of four nozzles bottom blowing. The mixing effect is the worst under the condition of single nozzle. When the bottom blowing is asymmetrical with double nozzles, the mixing time is the shortest. Under the condition of double nozzles asymmetrical bottom blowing, when the insertion angle and depth of side lance are larger and deeper, the velocity streamline of molten slag layer is denser and the value is larger; meanwhile, the reflux of molten iron layer is larger, the proportion of dead zone is smaller, and the whole molten pool is fully stirred. When the insertion depth of the side lance is deeper, the gas holdup in the molten pool is greater and the stirring of the molten pool is more intense, while the insertion angle has little effect on the gas holdup. By comparing the influence of different side blowing conditions on the slag layer, it is found that the slag layer is divided into two layers by double-layer side lance, with the critical surface of the slag layer at about 200–260 mm from the bottom, and the insertion depth of the lower side lance has a greater influence on the layering of the slag.

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Acknowledgements

The authors wish to express thanks to the National Natural Science Foundation of China (51904278), Shanxi Province Key R&D Program High-tech Project (201903D121093), Major Science and Technology Projects of Shanxi Province (20181101002), and General Project of Natural Science Foundation of Shanxi Province (20210302123218) for supporting this work.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, Shanxi, China

    Yi-bo He, Wen-ke Guo, Yi-hong Li, Guang-ming Liu & Xin Cui

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  1. Yi-bo He
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  2. Wen-ke Guo
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  3. Yi-hong Li
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  4. Guang-ming Liu
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Correspondence to Yi-bo He or Yi-hong Li.

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All authors declare that: (i) The manuscript is not submitted to more than one journal for simultaneous consideration; (ii) The submitted work is original and not have been published elsewhere in any form or language; (iii) The submitted work is not a single study which is split up into several parts to increase the quantity of submissions and submitted to various journals or to one journal over time; (iv) Results in this manuscript were presented clearly, honestly, and without fabrication, falsification or inappropriate data manipulation (including image based manipulation); (v) No data, text, or theories by others are presented as if they were the author’s own; (vi) Appropriate and relevant literature works have been cited in the manuscript in support of the claims made; (vii) Research that may be misapplied to pose a threat to public health or national security does not exist in the manuscript; (viii) The author group, the Corresponding Author, and the order of authors are all correct at submission.

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He, Yb., Guo, Wk., Li, Yh. et al. Numerical simulation of flow characteristics of side-bottom combined blowing in iron bath reactor. J. Iron Steel Res. Int. 30, 236–248 (2023). https://doi.org/10.1007/s42243-022-00812-5

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  • DOI: https://doi.org/10.1007/s42243-022-00812-5

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