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Parametric Study on Topping Cycle SOFC-MGT Hybrid Power System

[+] Author Affiliations
Liqiang Duan, Yongping Yang, Binbin He

North China Electric Power University, Beijing, China

De’an Tao

Jiangxi Vocational & Technical College of Electricity, Jiangsu, China

Paper No. GT2009-59689, pp. 257-263; 7 pages
doi:10.1115/GT2009-59689
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 4: Cycle Innovations; Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4885-2 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by ASME

abstract

In order to further improve the power generation efficiency, the hybrid power generation system integrated with high temperature fuel cell system has become the research focus in recent years. From the viewpoint of intercrossing of thermodynamics and electrochemistry, this paper studies the Solid Oxide Fuel Cell-Micro Gas Turbine (SOFC-MGT) hybrid combined cycle system. Firstly, based on the electrochemical analysis, SOFC system model is built and the effects of main parameters (current density, operating temperature and pressure, fuel utilization ratio, et al) on the overall SOFC system are analyzed; then, on the base of integration idea of total energy system, the topping cycle SOFC-MGT hybrid power system has been studied. The key parameters (such as current density, fuel utilization ratio, operating pressure and temperature) that greatly influence the hybrid system performance have been studied and optimized. The research results show both the thermodynamic parameters and electrochemical parameters have an important effect on the overall system performance; the topping cycle SOFC-MGT hybrid system will have a higher efficiency by increasing the operating temperature, operating pressure and fuel utilization ratio; when the operating temperature is 1173K and the current density is 3000A/m2 , the hybrid system efficiency is up to 67.39%, which is even higher than that of the current advanced large-scale gas-steam combined cycle system. The achievements obtained from this paper will provide some valuable information for further study on SOFC-GT hybrid system with high efficiency.

Copyright © 2009 by ASME

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