Operating pressure dependence of the pressurized oxy-fuel combustion power cycle
Name
J.Hong et al. Energy 35(12) 2010 5391-5399.pdf
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637.38 KB
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Author(s)
Gazzino, Marco
Hong, Jongsup
Field, Randall
Ghoniem, Ahmed F
Date Issued
August 2010
Journal
Energy
Publisher
Elsevier
Citation
Hong, Jongsup, Randall Field, Marco Gazzino, and Ahmed F. Ghoniem. "Operating pressure dependence of the pressurized oxy-fuel combustion power cycle." Energy 35:12 (December 2010), pp. 5391-5399.
Version
Author's final manuscript
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.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
MIT Energy Initiative
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/j.energy.2010.07.016
