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Author: search.filters.author.Patcharavorachot, YaneepornSubject: search.filters.subject.Hydrogen

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    Thermodynamic analysis of the novel chemical looping process for two-grade hydrogen production with CO2 capture
    (2019-01-15)
    Saithong, Natthaporn
    ;
    Authayanun, Suthida
    ;
    Patcharavorachot, Yaneeporn
    ;
    Arpornwichanop, Amornchai
    The integrated sorption-enhanced chemical looping reforming and water splitting (SECLR-WS) process was proposed for hydrogen (H<inf>2</inf>) production from biogas using iron oxide as an oxygen carrier and calcium oxide (CaO) as a carbon dioxide (CO<inf>2</inf>) adsorbent. In the SECLR-WS process, the biogas feed is partially oxidized using iron oxide and CO<inf>2</inf> is captured by CaO in the fuel reactor (FR) to produce H<inf>2</inf>-rich syngas. The iron oxide is re-oxidized in the steam reactor (SR) to generate a high-purity H<inf>2</inf> stream and CaO is regenerated in the calcinator. The simulation of the SECLR-WS process was based on a thermodynamic approach and was performed using an Aspen Plus simulator. The effects of key parameters such as the steam feed to the FR to methane (S<inf>FR</inf>/CH<inf>4</inf>) and iron (II, III) oxide (Fe<inf>3</inf>O<inf>4</inf>) to CH<inf>4</inf> (Fe<inf>3</inf>O<inf>4</inf>/CH<inf>4</inf>) molar ratios on the process performance in terms of H<inf>2</inf> yield and purity, and CH<inf>4</inf> conversion were investigated. The results showed that the H<inf>2</inf> yield, H<inf>2</inf> purity in the FR, and CH<inf>4</inf> conversion could be improved by increasing the S<inf>FR</inf>/CH<inf>4</inf> and CaO/CH<inf>4</inf> molar ratios. A total H<inf>2</inf> yield of 3.8 and a H<inf>2</inf> purity in the FR of 97.01 mol% can be obtained at the FR and SR temperatures of 610 and 500 °C, and S<inf>FR</inf>/CH<inf>4</inf>, CaO/CH<inf>4</inf>, Fe<inf>3</inf>O<inf>4</inf>/CH<inf>4</inf>, and S<inf>SR</inf>/CH<inf>4</inf> molar ratios of 2.2, 1.66, 1, and 2.87, respectively. The molar concentration of carbon monoxide (CO) in the high-purity H<inf>2</inf> stream could be reduced by increasing the pressure in the SR and the amount of CO<inf>2</inf> in the biogas feed stream negatively affected the performance of the system. In addition, increasing the Fe<inf>3</inf>O<inf>4</inf>/CH<inf>4</inf> molar ratio can improve the heat demand in the FR.
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    Effect of different fuel options on performance of high-temperature PEMFC (proton exchange membrane fuel cell) systems
    (2014-04-15)
    Authayanun, Suthida
    ;
    Saebea, Dang
    ;
    Patcharavorachot, Yaneeporn
    ;
    Arpornwichanop, Amornchai
    High-temperature proton exchange membrane fuel cells (HT-PEMFCs) have received substantial attention due to their high CO (carbon monoxide) tolerance and simplified water management. The hydrogen and CO fractions affect the HT-PEMFC performance and different fuel sources for hydrogen production result in different product gas compositions. Therefore, the aim of this study is to investigate the theoretical performance of HT-PEMFCs fueled by the reformate gas derived from various fuel options (i.e., methane, methanol, ethanol, and glycerol). Effects of fuel types and CO poisoning on the HT-PEMFC performance are analyzed. Furthermore, the necessity of a water-gas shift (WGS) reactor as a CO removal unit for pretreating the reformate gas is investigated for each fuel type. The methane steam reforming shows the highest possibility of CO formation, whereas the methanol steam reforming produces the lowest quantity of CO in the reformate gas. The methane fuel processing gives the maximum fraction of hydrogen (≈0.79) when the WGS reactor is included. The most suitable fuel is the one with the lowest CO poisoning effect and the maximum fuel cell performance. It is found that the HT-PEMFC system fueled by methanol without the WGS reactor and methane with WGS reactor shows the highest system efficiency (≈50%). © 2014 Elsevier Ltd.
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    Theoretical analysis of a biogas-fed PEMFC system with different hydrogen purifications: Conventional and membrane-based water gas shift processes
    (2014-01-01)
    Authayanun, Suthida
    ;
    Aunsup, Pounyaporn
    ;
    Patcharavorachot, Yaneeporn
    ;
    Arpornwichanop, Amornchai
    This study presents a thermodynamic analysis of biogas reforming and proton electrolyte membrane fuel cell (PEMFC) integrated process with different hydrogen purifications: conventional and membrane-based water gas shift processes. The aim is to determine the optimal reforming process for hydrogen production from biogas in the PEMFC system. The formation of carbon is concerned in the hydrogen production. The simulation results show that increases in the steam-to-methane ratio and reformer temperature can improve the hydrogen yield and reduce the carbon formation. From the performance analysis, it is found that when the PEMFC is operated at high temperature and fuel utilization, the overall system efficiency enhances. The performance of the PEMFC system with the installation of a water gas shift membrane unit in the hydrogen purification step is slightly increased, compared with a conventional process. © 2014 Elsevier Ltd. All rights reserved.