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Author: search.filters.author.Arpornwichanop, AmornchaiSubject: search.filters.subject.Proton conductor

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    Item type:Publication,
    Performance improvement of the proton-conducting solid oxide electrolysis cell coupled with dry methane reforming
    (2023-02-28)
    Patcharavorachot, Yaneeporn
    ;
    Chalee, Wissawa
    ;
    Saebea, Dang
    ;
    Arpornwichanop, Amornchai
    The proton-conducting solid oxide electrolysis cell (H-SOEC) is a clean technology for syngas production from H<inf>2</inf>O and CO<inf>2</inf> through electrochemical and chemical reactions. However, it provides a low CO<inf>2</inf> conversion and produces a syngas product with a high H<inf>2</inf>O content. To improve the H-SOEC for syngas production, H-SOEC coupled with a dry methane reforming process (H-SOEC/DMR) was proposed in this work. The process flowsheet of the H-SOEC/DMR was developed and further used to evaluate the performance of the H-SOEC/DMR process. From the performance analysis of the H-SOEC/DMR process, it was found that the CO<inf>2</inf> and CH<inf>4</inf> conversions were higher than 90% and 80%, respectively, when the process was operated in the temperature range of 1073–1273 K. In addition, the result showed that a syngas product with a low H<inf>2</inf>O content could be obtained. Energy efficiency was then considered and the results indicated that the highest energy efficiency of 72.80% could be achieved when the H-SOEC/DMR process was operated at a temperature of 1123 K, pressure of 1 atm, and current density of 2500 A m<sup>−2</sup>. Based on a pinch analysis, a heat exchanger network was applied to the H-SOEC/DMR process that improved the energy efficiency to 81.46%. Finally, an exergy analysis was performed and showed that the H-SOEC/DMR unit had the lowest exergy efficiency as a high-temperature exhaust gas was released.