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

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  • Bassily, A.M.

Abstract

Optimizing the gas-turbine combined-cycle is an important method for improving its efficiency. In this paper, a dual-pressure reheat combined-cycle was modeled and optimized for 80 cases. Constraints were set on the minimum temperature-difference for pinch points (PPm), superheat approach temperature-difference, steam-turbine inlet temperature and pressure, stack temperature, and dryness fraction at the steam-turbine's outlet. The dual-pressure reheat combined-cycle was optimized using two different methods; the direct search and the variable metric. A technique to reduce the irreversibility of the steam generator of the combined cycle was introduced. The optimized and the reduced-irreversibility dual-pressure reheat combined-cycles were compared with the regularly-designed dual-pressure reheat combined-cycle, which is the typical design for a commercial combined-cycle. The effects of varying the inlet temperature of the gas turbine (TIT) and PPm on the performance of all cycles were presented and discussed. The results indicated that the optimized combined-cycle is up to 1% higher in efficiency than the reduced-irreversibility combined-cycle, which is 2-2.5% higher in efficiency than the regularly-designed combined-cycle when compared for the same values of TIT and PPm. The advantages of the optimized and reduced-irreversibility combined-cycles were manifested when compared with the most efficient commercially-available combined cycle at the same value of TIT.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:81:y:2005:i:2:p:127-151
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    References listed on IDEAS

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    1. Bassily, A. M., 2004. "Performance improvements of the intercooled reheat recuperated gas-turbine cycle using absorption inlet-cooling and evaporative after-cooling," Applied Energy, Elsevier, vol. 77(3), pages 249-272, March.
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    Cited by:

    1. Colmenar-Santos, Antonio & Gómez-Camazón, David & Rosales-Asensio, Enrique & Blanes-Peiró, Jorge-Juan, 2018. "Technological improvements in energetic efficiency and sustainability in existing combined-cycle gas turbine (CCGT) power plants," Applied Energy, Elsevier, vol. 223(C), pages 30-51.
    2. Attila R. Imre & Réka Kustán & Axel Groniewsky, 2019. "Thermodynamic Selection of the Optimal Working Fluid for Organic Rankine Cycles," Energies, MDPI, vol. 12(10), pages 1-15, May.
    3. Yanfeng Li & Jingru Liu & Guohe Huang, 2022. "Pressure Drop Optimization of the Main Steam and Reheat Steam System of a 1000 MW Secondary Reheat Unit," Energies, MDPI, vol. 15(9), pages 1-15, April.
    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. Xiang, Yanlei & Cai, Lei & Guan, Yanwen & Liu, Wenbin & Han, Yixiao & Liang, Ying, 2018. "Study on the configuration of bottom cycle in natural gas combined cycle power plants integrated with oxy-fuel combustion," Applied Energy, Elsevier, vol. 212(C), pages 465-477.
    6. 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.
    7. 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.
    8. Oh, Hyun-Taek & Lee, Woo-Sung & Ju, Youngsan & Lee, Chang-Ha, 2019. "Performance evaluation and carbon assessment of IGCC power plant with coal quality," Energy, Elsevier, vol. 188(C).
    9. 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.
    10. Mehrgoo, Morteza & Amidpour, Majid, 2017. "Constructal design and optimization of a dual pressure heat recovery steam generator," Energy, Elsevier, vol. 124(C), pages 87-99.

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