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Maximizing Asset Value of Combustion Turbines

[+] Author Affiliations
John S. Hoffman, William L. Kopko

Enhanced Turbine Output LLC, Washington, D.C.

Paper No. GT2003-38012, pp. 769-775; 7 pages
doi:10.1115/GT2003-38012
From:
  • ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
  • Volume 1: Turbo Expo 2003
  • Atlanta, Georgia, USA, June 16–19, 2003
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3684-3 | eISBN: 0-7918-3671-1
  • Copyright © 2003 by ASME

abstract

An, improved gas-turbine supercharging technology [1–3], newly patented, uses variable supercharging with enhanced fogging or evaporative cooling (enhanced supercharging) to sustain mass density through a turbine system at maximum allowable level for the supercharged turbine, allowing output similar to that available normally at cold weather and sea level conditions all year long. Using variable pitch fans to modulate pressure increases, enhanced supercharging increases pressures to restore mass flow levels as high as possible without surpassing torque limits on the shaft or other constraining factors, such as generator capacity. Increased fogging then removes sensible heat added by the fan, essentially straight lining output throughout the year at the maximum output for which the turbine system has been designed. Largest increases in output occur on the hottest days, but significant increases also occur at ISO conditions and below. Achievable increments of net output on a peak summer day can be nine times higher than fogging alone, the currently preferred augmentation mode for combustion turbines. Enhanced supercharging increases shareholder value by maximizing the increase in economic value added (EVA) for combustion turbine assets [4]. Under EVA, an investment that returns 9% when the cost of capital is 9% would be counted as adding no increment of profit or value to a company. Whether a combustion turbine has an augmentation system or has none, enhanced supercharging almost always adds significant EVA. The EVA for enhanced supercharging often exceeds other options by an order of magnitude. Enhanced supercharging produces greatest profits on combined-cycle plants, although it will also produce additional EVA on many simple-cycle engines. As the power industry struggles to return to profitability, enhanced supercharging offers a simple and straightforward means to increase shareholder value, returning on average 15 times the economic value added of investments in base power plants. For new plants, the increment of value may be sufficient to turn a “no-go” into a “go” decision. For existing plants enhanced supercharging can to turn a lackluster financial year into a profitable one.

Copyright © 2003 by ASME
Topics: Combustion , Turbines

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