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High Pressure Gas Fired Intercooled Semi-Closed Recuperated Cycle

[+] Author Affiliations
Hans E. Wettstein

HEW, Zürich, Switzerland

Paper No. GT2016-56176, pp. V003T06A002; 10 pages
  • ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
  • Volume 3: Coal, Biomass and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration; Organic Rankine Cycle Power Systems
  • Seoul, South Korea, June 13–17, 2016
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4974-3
  • Copyright © 2016 by ASME


A promising semi-closed recuperated cycle (SCRC) has been suggested earlier by the author. For assessing the polytropic changes of state within this cycle ideal gas assumptions have been used as usual in gas turbine cycle analysis. But this leads finally to approximations which prevent an accurate extrapolation to a pressure level considerably above critical. The SCRC concept allows easy access to very high pressure and this has not yet been explored due to the lack of an appropriate method.

In two papers an incremental method called constant dissipation rate algorithm (CDRA) for calculating polytropic changes of state for real gases corresponding to the classic definition has been shown. In the first paper different polytropic change of state calculations have been compared with the temperature based CDRA for air gases and in the second paper the applicability of the enthalpy based CDRA for steam both in the vapor and in the wetness range (in equilibrium) has been demonstrated.

The validation of the calculation was first made by comparing with the previously published cycle data. This confirms the applicability of the ideal gas approximations for the data range up to a pressure level of 60 bars reasonably. Then versions with supercharging pressure ratio of up to 30 with a pressure level of up to 289bar were explored using the new temperature based CDRA method. It shows an impressive potential for high power density and low power turndown capability with no loss of efficiency and maintaining low emissions.

Copyright © 2016 by ASME



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