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Second-law based thermodynamic analysis of Brayton/Rankine combined power cycle with reheat

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  • Khaliq, A.
  • Kaushik, S. C.

Abstract

The aim of the present paper is to use the second-law approach for the thermodynamic analysis of the reheat combined Brayton/Rankine power cycle. Expressions involving the variables for specific power-output, thermal efficiency, exergy destruction in components of the combined cycle, second-law efficiency of each process of the gas-turbine cycle, and second-law efficiency of the steam power cycle have been derived. The standard approximation for air with constant properties is used for simplicity. The effects of pressure ratio, cycle temperature- ratio, number of reheats and cycle pressure-drop on the combined cycle performance parameters have been investigated. It is found that the exergy destruction in the combustion chamber represents over 50% of the total exergy destruction in the overall cycle. The combined cycle efficiency and its power output were maximized at an intermediate pressure-ratio, and increased sharply up to two reheat-stages and more slowly thereafter.

Suggested Citation

  • Khaliq, A. & Kaushik, S. C., 2004. "Second-law based thermodynamic analysis of Brayton/Rankine combined power cycle with reheat," Applied Energy, Elsevier, vol. 78(2), pages 179-197, June.
    • Handle: RePEc:eee:appene:v:78:y:2004:i:2:p:179-197
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    Cited by:

    1. Dong, Guangyu & Morgan, Robert & Heikal, Morgan, 2015. "A novel split cycle internal combustion engine with integral waste heat recovery," Applied Energy, Elsevier, vol. 157(C), pages 744-753.
    2. Mehrpanahi, A. & Nikbakht Naserabad, S. & Ahmadi, G., 2019. "Multi-objective linear regression based optimization of full repowering a single pressure steam power plant," Energy, Elsevier, vol. 179(C), pages 1017-1035.
    3. Gupta, M.K. & Kaushik, S.C. & Ranjan, K.R. & Panwar, N.L. & Reddy, V. Siva & Tyagi, S.K., 2015. "Thermodynamic performance evaluation of solar and other thermal power generation systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 50(C), pages 567-582.
    4. Yin, Juan & Su, Shi & Yu, Xin Xiang & Weng, Yiwu, 2010. "Thermodynamic characteristics of a low concentration methane catalytic combustion gas turbine," Applied Energy, Elsevier, vol. 87(6), pages 2102-2108, June.
    5. Singh, Omendra Kumar & Kaushik, Subhash C., 2013. "Reducing CO2 emission and improving exergy based performance of natural gas fired combined cycle power plants by coupling Kalina cycle," Energy, Elsevier, vol. 55(C), pages 1002-1013.
    6. Kaushik, S.C. & Reddy, V. Siva & Tyagi, S.K., 2011. "Energy and exergy analyses of thermal power plants: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(4), pages 1857-1872, May.
    7. Chandramouli, R. & Srinivasa Rao, M.S.S. & Ramji, K., 2015. "Energy and exergy based thermodynamic analysis of reheat and regenerative Braysson cycle," Energy, Elsevier, vol. 90(P2), pages 1848-1858.
    8. Siva Reddy, V. & Kaushik, S.C. & Tyagi, S.K., 2012. "Exergetic analysis of solar concentrator aided natural gas fired combined cycle power plant," Renewable Energy, Elsevier, vol. 39(1), pages 114-125.
    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. Padilla, Ricardo Vasquez & Soo Too, Yen Chean & Benito, Regano & Stein, Wes, 2015. "Exergetic analysis of supercritical CO2 Brayton cycles integrated with solar central receivers," Applied Energy, Elsevier, vol. 148(C), pages 348-365.

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