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MCFC-GT Hybrid System Aiming at 70% Thermal Efficiency

[+] Author Affiliations
Eiichi Koda, Toru Takahashi

Central Research Institute of Electric Power Industry, Yokosuka-shi, Kanagawa-ken, Japan

Paper No. GT2006-90644, pp. 199-206; 8 pages
doi:10.1115/GT2006-90644
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 4: Cycle Innovations; Electric Power; Industrial and Cogeneration; Manufacturing Materials and Metallurgy
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4239-8
  • Copyright © 2006 by ASME

abstract

The thermal efficiency improvement of fossil power generation is important to reduce both CO2 emission and power generating cost. To date, 60% (LHV) has been achieved with ACC (A dvanced C ombined C ycle) and a calculation result of 70% (LHV) or more has been reported for SOFC-GT hybrid. Then, we examined the thermal efficiency improvement considering the features of the gas turbine and the fuel cell, and designed the epoch-making cycle. By markedly improving the single-cell voltage of MCFC using oxygen as an oxidant, and having adopted a semiclosed cycle configuration in which gas turbine exhaust heat is effectively used almost completely, this cycle not only enables us to obtain an ultrahigh efficiency, but also can facilitate CO2 recovery. First, the thermal efficiency of a 300MW-class power plant using this cycle was examined, and it was confirmed that a net efficiency of 70% (HHV) or more was possible. Then, a 1MW-class system that can be realized in the near future is examined. As a result, it has been understood that it is promising as a small power supply, too. In this paper, the concept and basic configuration of this cycle were explained, and the detailed configuration and the thermal efficiency calculation results for both the 300MW-class system and the 1MW-class system are described.

Copyright © 2006 by ASME

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