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Economic and Performance Evaluation of Combined Cycle Repowering Options

[+] Author Affiliations
Rattan K. Tawney, James A. Bonner, Asem M. Elgawhary

Bechtel Power Corporation, Frederick, MD

Paper No. GT2002-30565, pp. 457-464; 8 pages
doi:10.1115/GT2002-30565
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3609-6 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

The majority of fossil units in many countries including the United States were built from 1950 through the 1970s, and these older plants are now approaching the end of their useful operating design life. Faced with continued demand growth and compliance with stringent emissions requirements, the power industry may choose building new replacement units, extending the operating life of existing units, or repowering these existing units. Repowering has been demonstrated to be an attractive alternative that incorporates state-of-the-art technologies into an existing unit to achieve higher performance and thermal efficiency, lower emissions, higher reliability and usefulness, and the potential for a shorter execution permitting schedule. Combined cycle technology has become desirable and has matured for the repowering existing plants because of its high thermal efficiency, low emissions, low installed and operation cost, short installation time, high reliability and availability, excellent cycling capability, and operating flexibility. Various options are available for repowering applications on existing plants with combined cycle technology. The options include hot windbox repowering, feedwater heater repowering, and combustion turbine (CT) with heat recovery steam generator (HRSG) repowering. This paper examines the performance benefits of these combined cycle repowering options and analyzes associated costs.

Copyright © 2002 by ASME

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