Induced Draft Fan Innovation for Heat Recovery Steam Generators PUBLIC ACCESS

[+] Author Affiliations
O. W. Beasley, E. C. Hutchins

Oklahoma Gas and Electric Company

P. R. Predick, J. M. Vavrek

Sargent & Lundy

Paper No. 93-GT-069, pp. V002T09A004; 5 pages
  • ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 2: Combustion and Fuels; Oil and Gas Applications; Cycle Innovations; Heat Transfer; Electric Power; Industrial and Cogeneration; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; IGTI Scholar Award
  • Cincinnati, Ohio, USA, May 24–27, 1993
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7889-7
  • Copyright © 1993 by ASME


A first of its kind, induced draft (ID) heat recovery steam generators (HRSG) have been in service at a cogeneration facility since 1991.

A preliminary engineering study considered a forced draft (FD) fan to supply combustion air to the HRSG duct burners (when the combustion turbine (CT) is out of service) as a traditional design; however, the study indicated that the FD fan may require the HRSG duct burner to be shut off following a CT trip and reignited after the FD fan was in service. Although the induced draft HRSG design cost more than the FD fan design, the induced draft design has improved the cogeneration facility’s steam generation reliability by enabling the HRSG to remain in service following a CT trip.

This paper briefly summarizes the preliminary engineering study that supported the decision to select the ID fan design. The paper also discusses the control system that operates the fresh-air louvers, duct burners, HRSG and ID fan during a CT trip. Startup and operating experiences are presented which demonstrate the effectiveness of the design. Lessons learned are also summarized for input into future induced draft HRSG designs.

Copyright © 1993 by ASME
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