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Exergy Analysis of an Intermediate Temperature Solid Oxide Fuel Cell-Gas Turbine Hybrid System Fed with Ethanol

Author

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  • Anastassios Stamatis

    (Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, 38334, Greece)

  • Christina Vinni

    (Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, 38334, Greece)

  • Diamantis Bakalis

    (Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, 38334, Greece)

  • Fotini Tzorbatzoglou

    (Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, 38334, Greece)

  • Panagiotis Tsiakaras

    (Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, 38334, Greece)

Abstract

In the present work, an ethanol fed Solid Oxide Fuel Cell-Gas Turbine (SOFC-GT) system has been parametrically analyzed in terms of exergy and compared with a single SOFC system. The solid oxide fuel cell was fed with hydrogen produced from ethanol steam reforming. The hydrogen utilization factor values were kept between 0.7 and 1. The SOFC’s Current-Volt performance was considered in the range of 0.1–3 A/cm 2 at 0.9–0.3 V, respectively, and at the intermediate operating temperatures of 550 and 600 °C, respectively. The curves used represent experimental results obtained from the available bibliography. Results indicated that for low current density values the single SOFC system prevails over the SOFC-GT hybrid system in terms of exergy efficiency, while at higher current density values the latter is more efficient. It was found that as the value of the utilization factor increases the SOFC system becomes more efficient than the SOFC-GT system over a wider range of current density values. It was also revealed that at high current density values the increase of SOFC operation temperature leads in both cases to higher system efficiency values.

Suggested Citation

  • Anastassios Stamatis & Christina Vinni & Diamantis Bakalis & Fotini Tzorbatzoglou & Panagiotis Tsiakaras, 2012. "Exergy Analysis of an Intermediate Temperature Solid Oxide Fuel Cell-Gas Turbine Hybrid System Fed with Ethanol," Energies, MDPI, vol. 5(11), pages 1-20, October.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:11:p:4268-4287:d:20950
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    References listed on IDEAS

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    1. Kandepu, Rambabu & Imsland, Lars & Foss, Bjarne A. & Stiller, Christoph & Thorud, Bjørn & Bolland, Olav, 2007. "Modeling and control of a SOFC-GT-based autonomous power system," Energy, Elsevier, vol. 32(4), pages 406-417.
    2. Zongping Shao & Sossina M. Haile, 2004. "A high-performance cathode for the next generation of solid-oxide fuel cells," Nature, Nature, vol. 431(7005), pages 170-173, September.
    3. Silveira, José Luz & Braga, Lúcia Bollini & de Souza, Antonio Carlos Caetano & Antunes, Julio Santana & Zanzi, Rolando, 2009. "The benefits of ethanol use for hydrogen production in urban transportation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(9), pages 2525-2534, December.
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    Cited by:

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    2. Bakalis, Diamantis P. & Stamatis, Anastassios G., 2014. "Optimization methodology of turbomachines for hybrid SOFC–GT applications," Energy, Elsevier, vol. 70(C), pages 86-94.
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    6. Azizi, Mohammad Ali & Brouwer, Jacob, 2018. "Progress in solid oxide fuel cell-gas turbine hybrid power systems: System design and analysis, transient operation, controls and optimization," Applied Energy, Elsevier, vol. 215(C), pages 237-289.
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