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Modeling, numerical optimization, and irreversibility reduction of a triple-pressure reheat combined cycle

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  • Bassily, A.M.

Abstract

The main methods for improving the efficiency of the combined cycle are: increasing the inlet temperature of the gas turbine (TIT), reducing the irreversibility of the heat recovery steam generator (HRSG), and optimization. In this paper, modeling and optimization of the triple-pressure reheat combined cycle as well as irreversibility reduction of its HRSG are considered. Constraints were set on the minimum temperature difference for pinch points (PPm), the temperature difference for superheat approach, the steam turbine inlet temperature and pressure, the stack temperature, and the dryness fraction at steam turbine outlet. The triple-pressure reheat combined cycle was optimized at 41 different maximum values of TIT using two different methods; the direct search and the variable metric. A feasible technique to reduce the irreversibility of the HRSG of the combined cycle was introduced. The optimized and the reduced-irreversibility triple-pressure reheat combined cycles were compared with the regularly designed triple-pressure reheat combined cycle, which is the typical design for a commercial combined cycle. The effects of varying the TIT on the performance of all cycles were presented and discussed. The results indicate that the optimized triple-pressure reheat combined cycle is up to 1.7% higher in efficiency than the reduced-irreversibility triple-pressure reheat combined cycle, which is 1.9–2.1% higher in efficiency than the regularly designed triple-pressure reheat combined cycle when all cycles are compared at the same values of TIT and PPm. The optimized and reduced-irreversibility combined cycles were compared with the most efficient commercially available combined cycle at the same value of TIT.

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  • Bassily, A.M., 2007. "Modeling, numerical optimization, and irreversibility reduction of a triple-pressure reheat combined cycle," Energy, Elsevier, vol. 32(5), pages 778-794.
    • Handle: RePEc:eee:energy:v:32:y:2007:i:5:p:778-794
    DOI: 10.1016/j.energy.2006.04.017
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    References listed on IDEAS

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    1. Franco, Alessandro & Casarosa, Claudio, 2004. "Thermoeconomic evaluation of the feasibility of highly efficient combined cycle power plants," Energy, Elsevier, vol. 29(12), pages 1963-1982.
    2. Bassily, A.M., 2005. "Modeling, numerical optimization, and irreversibility reduction of a dual-pressure reheat combined-cycle," Applied Energy, Elsevier, vol. 81(2), pages 127-151, June.
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    Cited by:

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    4. Srinivas, T., 2009. "Study of a deaerator location in triple-pressure reheat combined power cycle," Energy, Elsevier, vol. 34(9), pages 1364-1371.
    5. 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.
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    13. Mertens, Nicolas & Alobaid, Falah & Starkloff, Ralf & Epple, Bernd & Kim, Hyun-Gee, 2015. "Comparative investigation of drum-type and once-through heat recovery steam generator during start-up," Applied Energy, Elsevier, vol. 144(C), pages 250-260.
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