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Exergetic optimization of single level combined gas–steam power plants considering different objective functions

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  • Bracco, Stefano
  • Siri, Silvia

Abstract

Combined cycle power plants have been studied in this paper with the aim of optimizing the heat recovery steam generator using a first and second law approach. To this end, a mathematical model has been developed for determining the optimal steam pressure in a one pressure level heat recovery steam generator, considering that the gas turbine is known. Different objective functions have been analysed in this study, some of which refer only to the exergy balance of the heat recovery steam generator while others involve the whole bottoming cycle. Some constraints for the operating parameters of the power plant have also been taken into account, regarding for instance the steam quality at the turbine outlet and the steam turbine blade height. Some numerical results have been reported in the paper, comparing the different objective functions for heat recovery steam generators coupled with several gas turbines; the developed parametric analysis has been performed in order to evaluate the influence of some parameters on both the heat recovery steam generator and the whole bottoming cycle.

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  • Bracco, Stefano & Siri, Silvia, 2010. "Exergetic optimization of single level combined gas–steam power plants considering different objective functions," Energy, Elsevier, vol. 35(12), pages 5365-5373.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:12:p:5365-5373
    DOI: 10.1016/j.energy.2010.07.021
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    References listed on IDEAS

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    1. Bassily, A.M., 2008. "Enhancing the efficiency and power of the triple-pressure reheat combined cycle by means of gas reheat, gas recuperation, and reduction of the irreversibility in the heat recovery steam generator," Applied Energy, Elsevier, vol. 85(12), pages 1141-1162, December.
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    6. Tsatsaronis, George, 2007. "Definitions and nomenclature in exergy analysis and exergoeconomics," Energy, Elsevier, vol. 32(4), pages 249-253.
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    Citations

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    7. Bakhshmand, Sina Kazemi & Saray, Rahim Khoshbakhti & Bahlouli, Keyvan & Eftekhari, Hajar & Ebrahimi, Afshin, 2015. "Exergoeconomic analysis and optimization of a triple-pressure combined cycle plant using evolutionary algorithm," Energy, Elsevier, vol. 93(P1), pages 555-567.
    8. Ahmadi, Gholamreza & Toghraie, Davood & Akbari, Omid Ali, 2018. "Technical and environmental analysis of repowering the existing CHP system in a petrochemical plant: A case study," Energy, Elsevier, vol. 159(C), pages 937-949.
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    10. Nadir, Mahmoud & Ghenaiet, Adel, 2015. "Thermodynamic optimization of several (heat recovery steam generator) HRSG configurations for a range of exhaust gas temperatures," Energy, Elsevier, vol. 86(C), pages 685-695.

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