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
Publication statusPublished - 2003 Apr

Fingerprint

molten carbonate fuel cells
Molten carbonate fuel cells (MCFC)
gas turbines
Hybrid systems
Gas turbines
cycles
combustion chambers
Combustors
Recuperators
regenerators
turbines
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Power generation
Turbines
effluents
Distributed power generation
thermal resistance
operating temperature
Heat resistance

Keywords

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

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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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).",
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AU - Kasagi, Nobuhide

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AB - 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).

KW - Cycle analysis

KW - Energy saving

KW - Exergy

KW - Fuel cell

KW - Gas turbine

KW - Hybrid system

KW - Thermal efficiency

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