Cycle analysis of micro gas turbine-molten carbonate fuel cell hybrid system

Shinji Kimijima, Nobuhide Kasagi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A hybrid system based on a micro gas turbine (μGT) and a high temperature fuel cell, i.e., molten carbonate fuel cell (MCFC) or solid oxide fuel cell (SOFC), is expected to achieve a much higher efficiency than conventional distributed power generation systems. In this paper, a cycle analysis method and performance evaluation of a μGT-MCFC hybrid system, of which power output is 30 kW, are investigated to clarify its feasibility. A general design strategy is obtained that decreasing fuel input to a combustor and a higher MCFC operating temperature lead to higher power generation efficiency. A higher recuperator temperature effectiveness and steam-carbon ratio moderate requirements for the material strength of a turbine. It is also confirmed that a μGT-MCFC is much feasible to a μGT-SOFC in terms of its moderate heat-resistance of turbine and recuperator materials. In addition, employing a combustor for complete oxidation of MCFC effluents without additional fuel input, i.e., a catalytic combustor, the power generation efficiency of a μGT-MCFC is achieved to over 60% (LHV).

Original languageEnglish
Pages (from-to)1001-1008
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume69
Issue number680
DOIs
Publication statusPublished - 2003 Apr

Keywords

  • Cycle analysis
  • Energy saving
  • Exergy
  • Fuel cell
  • Gas turbine
  • Hybrid system
  • Thermal efficiency

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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