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Operating pressure dependence of the pressurized oxy-fuel combustion power cycle

Author

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  • Hong, Jongsup
  • Field, Randall
  • Gazzino, Marco
  • Ghoniem, Ahmed F.

Abstract

Oxy-fuel combustion technology is an attractive option for capturing carbon dioxide (CO2) in power generation systems utilizing hydrocarbon fuels. However, conventional atmospheric oxy-fuel combustion systems require substantial parasitic energy in the compression step within the air separation unit (ASU), the flue gas recirculation system and the carbon dioxide purification and compression unit (CPU). Moreover, a large amount of flue gas latent enthalpy, which has high water concentration, is wasted. Both lower the overall cycle efficiency. Pressurized oxy-fuel combustion power cycles have been investigated as alternatives. Our previous study showed the importance of operating pressure for these cycles. In this paper, as the extended work of our previous study, we perform a pressure sensitivity analysis to determine the optimal combustor operating pressure for the pressurized oxy-fuel combustion power cycle. We calculate the energy requirements of the ASU and the CPU, which vary in opposite directions as the combustor operating pressure is increased. We also determine the pressure dependence of the water-condensing thermal energy recovery and its relation to the gross power output. The paper presents a detailed study on the variation of the thermal energy recovery rate, the overall compression power demand, the gross power output and the overall net efficiency.

Suggested Citation

  • Hong, Jongsup & Field, Randall & Gazzino, Marco & Ghoniem, Ahmed F., 2010. "Operating pressure dependence of the pressurized oxy-fuel combustion power cycle," Energy, Elsevier, vol. 35(12), pages 5391-5399.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:12:p:5391-5399
    DOI: 10.1016/j.energy.2010.07.016
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    References listed on IDEAS

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    1. Hong, Jongsup & Chaudhry, Gunaranjan & Brisson, J.G. & Field, Randall & Gazzino, Marco & Ghoniem, Ahmed F., 2009. "Analysis of oxy-fuel combustion power cycle utilizing a pressurized coal combustor," Energy, Elsevier, vol. 34(9), pages 1332-1340.
    2. Bcrp, 2008. "Reporte de Inflación," Revista Moneda, Banco Central de Reserva del Perú, issue 138, pages 4-8.
    3. Saha, Pranesh Chandra, 2003. "Sustainable energy development: a challenge for Asia and the Pacific region in the 21st century," Energy Policy, Elsevier, vol. 31(11), pages 1051-1059, September.
    4. AfDB AfDB, . "AfDB Group Annual Report 2007," Annual Report, African Development Bank, number 63 edited by Koua Louis Kouakou.
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