The design point performance of combined cycle power plants has been steadily increasing, because of improvements both in the gas turbine technology and in the heat recovery technology, with multiple pressure heat recovery steam generators. The concern remains, however, that combined cycle power plants, like all installations based on gas turbines, have a rapid performance degradation when the load is reduced. In particular, it is well known that the efficiency degradation of a combined cycle is more rapid than that of a classical steam plant. This paper describes a methodology that can be used to evaluate the part-load performances of combined cycle units. Some examples are presented and discussed, covering multiple pressure arrangements, incorporating supplemental firing and possibly reheat. Some emphasis is put on the additional flexibility offered by the use of supplemental firing, in conjunction with schemes comprising more than one gas turbine per steam turbine. The influence of the gas turbine controls, like the use of variable inlet guide vanes in the compressor control, is also discussed.
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July 1995
Research Papers
Part-Load Operation of Combined Cycle Plants With and Without Supplementary Firing
P. J. Dechamps,
P. J. Dechamps
Department of Nuclear Engineering and Power Plants, University of Lie`ge, Lie`ge, Belgium
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N. Pirard,
N. Pirard
Department of Nuclear Engineering and Power Plants, University of Lie`ge, Lie`ge, Belgium
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Ph. Mathieu
Ph. Mathieu
Department of Nuclear Engineering and Power Plants, University of Lie`ge, Lie`ge, Belgium
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P. J. Dechamps
Department of Nuclear Engineering and Power Plants, University of Lie`ge, Lie`ge, Belgium
N. Pirard
Department of Nuclear Engineering and Power Plants, University of Lie`ge, Lie`ge, Belgium
Ph. Mathieu
Department of Nuclear Engineering and Power Plants, University of Lie`ge, Lie`ge, Belgium
J. Eng. Gas Turbines Power. Jul 1995, 117(3): 475-483 (9 pages)
Published Online: July 1, 1995
Article history
Received:
July 23, 1994
Online:
November 19, 2007
Citation
Dechamps, P. J., Pirard, N., and Mathieu, P. (July 1, 1995). "Part-Load Operation of Combined Cycle Plants With and Without Supplementary Firing." ASME. J. Eng. Gas Turbines Power. July 1995; 117(3): 475–483. https://doi.org/10.1115/1.2814120
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