KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/kmitl/1

Browse

Settings

Author: search.filters.author.Saebea, DangSubject: search.filters.subject.Solid oxide electrolysis cell

Search Results

Now showing 1 - 4 of 4
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    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.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Operational Analysis of a Proton-Conducting Solid Oxide Electrolysis Cell for Synthetic Fuel Production
    (2021-01-01)
    Bhichaiphab, Jinjutha
    ;
    Saebea, Dang
    ;
    Arpornwichanop, Amornchai
    ;
    Patcharavorachot, Yaneeporn
    Methane and methanol as synthetic fuels can be produced from synthesis gas or syngas. A proton-conducting solid oxide electrolysis cell (H-SOEC) becomes a promising technology that can produce syngas from the co-electrolysis of steam and CO<inf>2</inf>. In this work, the synthetic fuel production from syngas produced by a H-SOEC was modelled and simulated through Aspen Plus simulation software. The composition of syngas and synthetic fuel were calculated by using the minimization of Gibbs free energy. Firstly, the steam to CO<inf>2</inf> (S/C) molar ratio in feed was determined to satisty the suitable stoichiometric number of each fuel. Further, the H-SOEC operating temperature was optimized. The simulation showed that at operation of H-SOEC as 650 °C and 1 atm, the optimal S/C molar ratio for methane and methanol productions is 4.69 and 3.52, respectively. Then, the effect of operation in fuel production was examined. The results indicated that methane flowrate of 0.2 kmol/h can be provided when reactor operates at 250 °C and 3 atm. For methanol production, 0.13 kmol/h of methanol can be generated at reactor operation as 250 °C and 80 atm. In addition, it was found that the methane production does not release CO and CO<inf>2</inf> to nature. Therefore, it can be concluded that the integrated system of H-SOEC and methane production is more attractive feature.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Flowsheet-based model and exergy analysis of solid oxide electrolysis cells for clean hydrogen production
    (2018-01-01)
    Im-orb, Karittha
    ;
    Visitdumrongkul, Nuttawut
    ;
    Saebea, Dang
    ;
    Patcharavorachot, Yaneeporn
    ;
    Arpornwichanop, Amornchai
    A solid oxide electrolysis cell (SOEC) is an electrochemical technology used for hydrogen production via a steam electrolysis reaction. Because the existing SOEC models are complicated, the aim of this study is to develop a user-friendly SOEC model in a flowsheet simulator (Aspen Plus). The developed model is used to perform a parametric analysis to investigate the effects of key process parameters, i.e., operating temperature, current density, steam concentration, sweep gas type and number of cells, on the SOEC performance. The simulation results show that the voltage and the overall overpotential decrease as the cell temperature increases, whereas the opposite trends are observed when the current density increases. From the energy and exergy analyses, the total energy demand slightly increases with cell temperature, whereas the electrical energy demand decreases. Based on an operating temperature of 1273 K when the SOEC uses oxygen as the sweep gas, the highest energy and exergetic efficiencies of 78.45% and 92.20% are achieved at a current density of 2500 A m<sup>−2</sup> and at a steam concentration of 90% in a 500-cell stack.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Performance comparison of solid oxide steam electrolysis cells with/without the addition of methane
    (2016-07-15)
    Patcharavorachot, Yaneeporn
    ;
    Thongdee, Sirapa
    ;
    Saebea, Dang
    ;
    Authayanun, Suthida
    ;
    Arpornwichanop, Amornchai
    Hydrogen is considered a clean energy carrier for the future. At present, the production of hydrogen via a solid oxide electrolysis cell is of interest because water is the only reactant used; however, hydrogen production through electrolysis technology is still costly due to high electrical energy consumption. To reduce this energy demand, an addition of methane to the anode side of the solid oxide electrolysis cell, where it behaves like the anode side of the solid oxide fuel cell and generates heat and electricity to accomplish the electrolysis process, is one interesting method. In this study, modeling of the solid oxide fuel-assisted electrolysis cell is performed based on an electrochemical model to analyze the performance of the electrolyzer with/without the addition of methane in terms of the power input and the energy efficiency. In addition, the effect on the electrolyzer cell by key operating parameters, such as current density, steam fraction, steam-to-carbon ratio, temperature, pressure, steam utilization and fuel utilization, is presented. The simulation analysis shows that the performance of the solid oxide fuel-assisted electrolysis cell is higher than that of conventional solid oxide electrolysis cell, as it requires a lower power input. Furthermore, it is possible to run the solid oxide fuel-assisted electrolysis cell without an external electrical energy input.