Title: Energy and exergy efficiency evaluations of hydrogen-based fluidised bed ironmaking reactor

Authors: Wenlei Zhou; Fuyong Su; Cunwang Li; Kunpeng Zhang; Shengnan Wei; Sizong Zhang

Addresses: School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing, 100083, China ' School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing, 100083, China ' School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing, 100083, China ' School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing, 100083, China ' School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing, 100083, China ' School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing, 100083, China

Abstract: This paper analyses the energy and exergy efficiency of hydrogen-based fluidised bed (FB). The results indicate that the energy and exergy efficiencies of the single-stage FB are 35.16% and 27.45%, respectively, while those of the two-stage FB are 33.46% and 27.31%. Increasing the ratio of H₂ injection can cause a substantial decrease in both energy and exergy efficiencies. Furthermore, exergy efficiency in both types of FB gradually rises with reaction temperature, while energy efficiency initially increases then declines, reaching a maximum at 1,023 K. Increasing N₂ content leads to a gradual decrease in energy efficiency, with minimal impact on exergy efficiency.

Keywords: hydrogen-based fluidised bed; energy efficiency; exergy efficiency; ratio of H₂ injection; reaction temperature; N₂ content.

DOI: 10.1504/IJEX.2025.143791

International Journal of Exergy, 2025 Vol.46 No.1, pp.32 - 48

Received: 04 Sep 2024
Accepted: 20 Oct 2024
Published online: 07 Jan 2025 *

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