Integrating alkaline electrolysis with oxyfuel combustion for hydrogen and electricity production

Javad Jeddizahed, Paul A. Webley and Thomas J. Hughes

Applied Energy, 2024, vol. 361, issue C, No S0306261924002393

Abstract: The present study explores the potential of integrating the NET Zero Cycle (NZC) with hydrogen production by alkaline electrolyzers. To achieve this, an Aspen Plus model was developed for the NZC, and its accuracy was first confirmed by comparing it with literature data. The creation of a model for an alkaline electrolyzer was achieved using Aspen Custom Modeler and later imported into Aspen Plus. A comprehensive simulation was conducted in Aspen Plus to examine the synergies between the NZC and the alkaline electrolyzer. In this integration, the oxygen demand of the NZC is met by a combination of an air separation unit (ASU) and the electrolyzer. The electrolyzer not only partially fulfills the oxygen requirements but also acts as an external heat supplier for the regenerator. Additionally, the NZC supplies deionized water to the electrolyzer. A thermodynamic analysis indicates that the integration of the NZC and alkaline electrolyzers results in a higher efficiency of 56.5 % compared to the stand-alone NZC, an improvement of 2.3 %. Assuming that the NZC and alkaline electrolyzer operate at the same power production and input levels, the alkaline electrolyzer can generate substantial oxygen to reduce the energy consumption of the ASU significantly. This aspect represents one of the primary reasons for the enhanced efficiency observed in this study. However, the ASU still needs to be operated to provide the full oxygen demands of the process.

Keywords: NET zero cycle; Hydrogen; Integration; Alkaline electrolyzer; Process Simulation (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (1)

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DOI: 10.1016/j.apenergy.2024.122856

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