Yiru Yang, Qipeng Bao, Lei Guo, Zhe Wang, and Zhancheng Guo, Numerical simulation of flash reduction in a drop tube reactor with variable temperatures, Int. J. Miner. Metall. Mater., 29(2022), No. 2, pp. 228-238. https://doi.org/10.1007/s12613-020-2210-1
Cite this article as:
Yiru Yang, Qipeng Bao, Lei Guo, Zhe Wang, and Zhancheng Guo, Numerical simulation of flash reduction in a drop tube reactor with variable temperatures, Int. J. Miner. Metall. Mater., 29(2022), No. 2, pp. 228-238. https://doi.org/10.1007/s12613-020-2210-1
Research Article

Numerical simulation of flash reduction in a drop tube reactor with variable temperatures

+ Author Affiliations
  • Corresponding authors:

    Lei Guo    E-mail: leiguo@ustb.edu.cn

    Zhancheng Guo    E-mail: zcguo@ustb.edu.cn

  • Received: 14 August 2020Revised: 17 October 2020Accepted: 19 October 2020Available online: 20 October 2020
  • A computational fluid dynamics (CFD) model was developed to accurately predict the flash reduction process, which is considered an efficient alternative ironmaking process. Laboratory-scale experiments were conducted in drop tube reactors to verify the accuracy of the CFD model. The reduction degree of ore particles was selected as a critical indicator of model prediction, and the simulated and experimental results were in good agreement. The influencing factors, including the particle size (20–110 μm), peak temperature (1250–1550°C), and reductive atmosphere (H2/CO), were also investigated. The height variation lines indicated that small particles (50 μm) had a longer residence time (3.6 s) than large particles. CO provided a longer residence time (~1.29 s) than H2 (~1.09 s). However, both the experimental and analytical results showed that the reduction degree of particles in CO was significantly lower than that in H2 atmosphere. The optimum experimental particle size and peak temperature for the preparation of high-quality reduced iron were found to be 50 μm and 1350°C in H2 atmosphere, and 40 μm and 1550°C in CO atmosphere, respectively.

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