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Reduction of Gas Turbine Exhaust Temperature Limit due to HRSG Limitations by Change on Control Curve to Optimize Plant Operation and Performance

[+] Author Affiliations
Eduardo Mendoza, TsungPo Lin, Xiaomo Jiang

GE Power & Water, Atlanta, GA

Paper No. GT2015-43784, pp. V003T20A016; 12 pages
doi:10.1115/GT2015-43784
From:
  • ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
  • Volume 3: Coal, Biomass and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration
  • Montreal, Quebec, Canada, June 15–19, 2015
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5667-3
  • Copyright © 2015 by ASME

abstract

Most of the GE gas turbine fleet operates with exhaust temperature control characterized by various forms of Temperature Control Curves (TCC). The TCC which all have specific isothermal limits (maximum exhaust gas temperature) assigned. The isothermal limit is defined mainly by the materials used in the exhaust area including the exhaust frame, exhaust diffuser, struts. The isothermal limit is set to protect the turbine exhaust section from damage by excessive temperature. Although the isothermal limit is typically driven by turbine exhaust temperature limitation, there is a growing demand for isothermal limit adjustment due to HRSG operation limitation, e.g., HP steam attemperation, and also due to emission issues at part load operation.

The content of this paper presents a systematic approach for adjusting the isothermal limit to enhance the plant performance while still satisfying limitations in HRSG and DLN combustor operability. This exercise is a multi-disciplinary optimization process and it requires iterative communications among different disciplinary engineering teams. The methodology was applied to the case of 107FA Combined Cycle isothermal limit reduction for part load operation.

Copyright © 2015 by ASME

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