The design-point performance characteristics of a wide variety of combined-cogeneration power plants, with different amounts of supplementary firing (or no supplementary firing), different amounts of steam injection (or no steam injection), different amounts of exhaust gas condensation, etc., without limiting these parameters to present-day limits are investigated. A representative power plant with appropriate components for these plant enhancements is developed. A computer program is used to evaluate the performance of various power plants using standard inputs for component efficiencies, and the design-point performance of these plants is computed. The results are presented as thermal efficiency, specific power, effectiveness, and specific rate of energy in district heating. The performance of the simple-cycle gas turbine dominates the overall plant performance; the plant efficiency and power are mainly determined by turbine inlet temperature and compressor pressure ratio; increasing amounts of steam injection in the gas turbine increases the efficiency and power; increasing amounts of supplementary firing decreases the efficiency but increases the power; with sufficient amounts of supplementary firing and steam injection the exhaust-gas condensate is sufficient to make up for water lost in steam injection; and the steam-turbine power is a fraction (0.1 to 0.5) of the gas-turbine power output. Regions of “optimum” parameters for the power plant based on design-point power, hot-water demand, and efficiency are shown. A method for fuel-cost allocation between electricity and hot water is recommended.
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January 2005
Technical Papers
Parametric Performance of Combined-Cogeneration Power Plants With Various Power and Efficiency Enhancements
T. Korakianitis, James Watt Professor of Mechanical Engineering,,
T. Korakianitis, James Watt Professor of Mechanical Engineering,
University of Glasgow, Glasgow G12 8QQ, Scotland UK
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J. Grantstrom,
J. Grantstrom
Department of Heat and Power Engineering, Royal Institute of Technology, Stockholm, Sweden
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P. Wassingbo,
P. Wassingbo
Department of Heat and Power Engineering, Royal Institute of Technology, Stockholm, Sweden
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Aristide F. Massardo
Aristide F. Massardo
University of Genova, Genova, Italy
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T. Korakianitis, James Watt Professor of Mechanical Engineering,
University of Glasgow, Glasgow G12 8QQ, Scotland UK
J. Grantstrom
Department of Heat and Power Engineering, Royal Institute of Technology, Stockholm, Sweden
P. Wassingbo
Department of Heat and Power Engineering, Royal Institute of Technology, Stockholm, Sweden
Aristide F. Massardo
University of Genova, Genova, Italy
Contributed by the International Gas Turbine Institute and presented at the 42nd International Gas Turbine and Aeroengine Congress and Exposition, Orlando, FL, June 2–5 1997. Manuscript received November 1, 1996; final revision received February 1, 1997. Paper No. 1997-GT-0285. Associate Editor: H. A. Kidd.
J. Eng. Gas Turbines Power. Jan 2005, 127(1): 65-72 (8 pages)
Published Online: February 9, 2005
Article history
Received:
November 1, 1996
Revised:
February 1, 1997
Online:
February 9, 2005
Citation
Korakianitis , T., Grantstrom , J., Wassingbo, P., and Massardo, A. F. (February 9, 2005). "Parametric Performance of Combined-Cogeneration Power Plants With Various Power and Efficiency Enhancements ." ASME. J. Eng. Gas Turbines Power. January 2005; 127(1): 65–72. https://doi.org/10.1115/1.1808427
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