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    Analysis of a pressurized solid oxide fuel cell-gas turbine hybrid power system with cathode gas recirculation
    (2013-04-15)
    Saebea, Dang
    ;
    Patcharavorachot, Yaneeporn
    ;
    Assabumrungrat, Suttichai
    ;
    Arpornwichanop, Amornchai
    A pressurized solid oxide fuel cell-gas turbine hybrid system (SOFC-GT system) has been received much attention for a distributed power generation due to its high efficiency. When considering an energy management of the system, it is found that a heat input is highly required to preheat air before being fed to the SOFC stack. The recirculation of a high-temperature cathode exhaust gas is probably an interesting option to reduce the requirement of an external heat for the SOFC-GT system. This study aims to analyze the pressurized SOFC-GT hybrid system fed by ethanol with the recycle of a cathode exhaust gas via a simulation study. Effect of important operating parameters on the electrical efficiency and heat management of the system is investigated. The results indicate that an increase in the operating pressure dramatically improves the system electrical efficiency. The suitable pressure is in a range of 4-6 bar, achieving the highest system electrical efficiency and the lowest recuperation energy from the waste heat of the GT exhaust gas. In addition, it is found that the waste heat obtained from the GT is higher than the heat required for the system, leading to a possibility of the SOFC-GT system to be operated at a self-sustainable condition. Under a high pressure operation, the SOFC-GT system requires a high recirculation of the cathode exhaust gas to maintain the system without supplying the external heat; however, the increased recirculation ratio of the cathode exhaust gas reduces the system electrical efficiency. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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    Design of energy recuperation in a solid oxide fuel cell-gas turbine hybrid system with ethanol as fuel
    (2013-01-01)
    Saebea, D.
    ;
    Patcharavorachot, Y.
    ;
    Authayanun, S.
    ;
    Arpornwichanop, A.
    An ethanol reforming and solid oxide fuel cell-gas turbine (SOFC-GT) hybrid system with anode and/or cathode recirculation is investigated in this study. The aim is to analyze the effect of the anode and cathode recirculation on the performance of SOFC-GT system. The results showed that the hybrid system with both the cathode and anode recirculation achieve the highest system efficiency.
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    Design and Thermal Analysis of a Solid Oxide Fuel Cell System Integrated with Ethanol Steam Reforming
    (2012-01-01)
    Thanomjit, Chollaphan
    ;
    Patcharavorachot, Yaneeporn
    ;
    Arpornwichanop, Amornchai
    In this study, a thermal management of the solid oxide fuel cell (SOFC) system integrated with a steam reformer was investigated. Due to its renewable and green energy sources, ethanol was chosen as a fuel for the SOFC system in which it was converted into a hydrogen rich gas via a steam reforming. Modeling of the SOFC system was performed using a process simulator. The SOFC system performance was evaluated with respect to key operating parameters such as reforming temperature, SOFC temperature and steam to ethanol ratio. It was found that the ethanol reformer and pre-heaters require high energy consumption. To improve its thermal efficiency, the SOFC system with heat integration was analyzed and the exhaust gas from an SOFC stack was considered a useful heat source. Pinch analysis was applied to design the SOFC system with the aim to minimize the requirement of external energy sources. © 2012 Elsevier B.V.