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Author: search.filters.author.Assabumrungrat, SuttichaiSubject: search.filters.subject.Ethanol steam reforming

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    Compact heat integrated reactor system of steam reformer, shift reactor and combustor for hydrogen production from ethanol
    (2020-06-01)
    Khaodee, Watcharapong
    ;
    Jiwanuruk, Tara
    ;
    Ountaksinkul, Khunnawat
    ;
    Charojrochkul, Sumittra
    ;
    Charoensuk, Jarruwat
    A compact heat integrated reactor system (CHIRS) of a steam reformer, a water gas shift reactor, and a combustor were designed for stationary hydrogen production from ethanol. Different reactor integration concepts were firstly studied using Aspen Plus. The sequential steam reformer and shift reactor (SRSR) was considered as a conventional system. The efficiency of the SRSR could be improved by more than 12% by splitting water addition to the shift reactor (SRSR-WS). Two compact heat integrated reactor systems (CHIRS) were proposed and simulated by using COMSOL Multiphysics software. Although the overall efficiency of the CHIRS was quite a bit lower than the SRSR-WS, the compact systems were properly designed for portable use. CHIRS (I) design, combining the reactors in a radial direction, was large in reactor volume and provided poor temperature control. As a result, the ethanol steam reforming and water gas shift reactions were suppressed, leading to lower hydrogen selectivity. On the other hand, CHIRS (II) design, combining the process in a vertical direction, provided better temperature control. The reactions performed efficiently, resulting in higher hydrogen selectivity. Therefore, the high performance CHIRS (II) design is recommended as a suitable stationary system for hydrogen production from ethanol.
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    Adsorption-membrane hybrid system for ethanol steam reforming: Thermodynamic analysis
    (2011-11-01)
    Saebea, Dang
    ;
    Arpornwichanop, Amornchai
    ;
    Patcharavorachot, Yaneeporn
    ;
    Assabumrungrat, Suttichai
    In this study, an adsorption-membrane hybrid system in which a carbon dioxide adsorbent is used to remove undesired carbon dioxide and a membrane is applied for hydrogen separation is theoretically investigated with the aim to improve the performance of an ethanol steam reforming. A thermodynamic analysis of such the system was performed and compared with a membrane reactor and an adsorptive reactor. It was found that the removal of hydrogen by membrane separation has higher impact on the reformer performance than the carbon dioxide capture by adsorption. The adsorption-membrane hybrid system for ethanol steam reforming gives the highest hydrogen yield. Considering a possibility for carbon formation, the simulation results showed that the use of membrane for pure hydrogen production increases the trend toward carbon formation. This is due to an increase in carbon monoxide concentration in the reaction zone that promotes the Boudouard reaction. In contrast, the use of carbon dioxide adsorbent reduces the formation of carbon as carbon monoxide is less generated in the system. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.