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Exergy analysis and optimization of a biomass gasification, solid oxide fuel cell and micro gas turbine hybrid system

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  • Bang-Møller, C.
  • Rokni, M.
  • Elmegaard, B.

Abstract

A hybrid plant producing combined heat and power (CHP) from biomass by use of a two-stage gasification concept, solid oxide fuel cells (SOFC) and a micro gas turbine was considered for optimization. The hybrid plant represents a sustainable and efficient alternative to conventional decentralized CHP plants. A clean product gas was produced by the demonstrated two-stage gasifier, thus only simple gas conditioning was necessary prior to the SOFC stack. The plant was investigated by thermodynamic modeling combining zero-dimensional component models into complete system-level models. Energy and exergy analyses were applied. Focus in this optimization study was heat management, and the optimization efforts resulted in a substantial gain of approximately 6% in the electrical efficiency of the plant. The optimized hybrid plant produced approximately 290 kWe at an electrical efficiency of 58.2% based on lower heating value (LHV).

Suggested Citation

  • Bang-Møller, C. & Rokni, M. & Elmegaard, B., 2011. "Exergy analysis and optimization of a biomass gasification, solid oxide fuel cell and micro gas turbine hybrid system," Energy, Elsevier, vol. 36(8), pages 4740-4752.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:8:p:4740-4752
    DOI: 10.1016/j.energy.2011.05.005
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    References listed on IDEAS

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