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An integrated power generation system combining solid oxide fuel cell and oxy-fuel combustion for high performance and CO2 capture

Author

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  • Park, Sung Ku
  • Kim, Tong Seop
  • Sohn, Jeong L.
  • Lee, Young Duk

Abstract

An integrated power generation system combining solid oxide fuel cell (SOFC) and oxy-fuel combustion technology is proposed. The system is revised from a pressurized SOFC-gas turbine hybrid system to capture CO2 almost completely while maintaining high efficiency. The system consists of SOFC, gas turbine, oxy-combustion bottoming cycle, and CO2 capture and compression process. An ion transport membrane (ITM) is used to separate oxygen from the cathode exit air. The fuel cell operates at an elevated pressure to facilitate the use of the ITM, which requires high pressure and temperature. The remaining fuel at the SOFC anode exit is completely burned with oxygen at the oxy-combustor. Almost all of the CO2 generated during the reforming process of the SOFC and at the oxy-fuel combustor is extracted from the condenser of the oxy-combustion cycle. The oxygen-depleted high pressure air from the SOFC cathode expands at the gas turbine. Therefore, the expander of the oxy-combustion cycle and the gas turbine provides additional power output. The two major design variables (steam expander inlet temperature and condenser pressure) of the oxy-fuel combustion system are determined through parametric analysis. There exists an optimal condenser pressure (below atmospheric pressure) in terms of global energy efficiency considering both the system power output and CO2 compression power consumption. It was shown that the integrated system can be designed to have almost equivalent system efficiency as the simple SOFC-gas turbine hybrid system. With the voltage of 0.752 V at the SOFC operating at 900 °C and 8 bar, system efficiency over 69.2% is predicted. Efficiency penalty due to the CO2 capture and compression up to 150 bar is around 6.1%.

Suggested Citation

  • Park, Sung Ku & Kim, Tong Seop & Sohn, Jeong L. & Lee, Young Duk, 2011. "An integrated power generation system combining solid oxide fuel cell and oxy-fuel combustion for high performance and CO2 capture," Applied Energy, Elsevier, vol. 88(4), pages 1187-1196, April.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:4:p:1187-1196
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    References listed on IDEAS

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