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

Christian Bang-Møller, Masoud Rokni, Brian Elmegaard

Research output: Contribution to journalJournal articleResearchpeer-review

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).
Original languageEnglish
JournalEnergy
Volume36
Issue number8
Pages (from-to)4740-4752
ISSN0360-5442
DOIs
Publication statusPublished - 2011

Keywords

  • Solid oxide fuel cells
  • Exergy
  • Micro gas turbine
  • Biomass gasification
  • Combined heat and power
  • Optimization

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