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Investigation of effect of variation of cycle parameters on thermodynamic performance of gas-steam combined cycle

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  • Sanjay,

Abstract

The paper deals with second law thermodynamic analysis of a basic gas turbine based gas-steam combined cycle. The article investigates the effect of variation of cycle parameters on rational efficiency and component-wise non-dimensionalised exergy destruction of the plant. Component-wise inefficiencies of the combined cycle have been quantified with the objective to pin-point the major sources of exergy destruction. The parameter that affects cycle performance most is the TIT (turbine inlet temperature). TIT should be kept on the higher side, because at lower values, the exergy destruction is higher. The summation of total exergy destruction of all components in percentage terms is lower (44.88%) at TIT of 1800 K & rp,c = 23, as compared to that at TIT = 1700 K. The sum total of rational efficiency of gas turbine and steam turbine is found to be higher (54.91%) at TIT = 1800 K & rp,c = 23, as compared to that at TIT = 1700 K. Compressor pressure ratio also affects the exergy performance. The sum total of exergy destruction of all components of the combined cycle plant is lower (44.17%) at higher value of compressor pressure ratio (23)& TIT = 1700 K, as compared to that at compressor pressure ratio (16). Also exergy destruction is minimized with the adoption of multi-pressure-reheat steam generator configuration.

Suggested Citation

  • Sanjay,, 2011. "Investigation of effect of variation of cycle parameters on thermodynamic performance of gas-steam combined cycle," Energy, Elsevier, vol. 36(1), pages 157-167.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:1:p:157-167
    DOI: 10.1016/j.energy.2010.10.058
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    3. Ersayin, Erdem & Ozgener, Leyla, 2015. "Performance analysis of combined cycle power plants: A case study," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 832-842.
    4. Ibrahim, Thamir k. & Mohammed, Mohammed Kamil & Awad, Omar I. & Rahman, M.M. & Najafi, G. & Basrawi, Firdaus & Abd Alla, Ahmed N. & Mamat, Rizalman, 2017. "The optimum performance of the combined cycle power plant: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 79(C), pages 459-474.
    5. Sahu, Mithilesh Kumar & Sanjay,, 2016. "Investigation of the effect of air film blade cooling on thermoeconomics of gas turbine based power plant cycle," Energy, Elsevier, vol. 115(P1), pages 1320-1330.
    6. Sanjay, & Prasad, Bishwa N., 2013. "Energy and exergy analysis of intercooled combustion-turbine based combined cycle power plant," Energy, Elsevier, vol. 59(C), pages 277-284.
    7. Luo, Xianglong & Zhang, Bingjian & Chen, Ying & Mo, Songping, 2011. "Modeling and optimization of a utility system containing multiple extractions steam turbines," Energy, Elsevier, vol. 36(5), pages 3501-3512.
    8. Ajimotokan, H.A. & Sher, I., 2015. "Thermodynamic performance simulation and design optimisation of trilateral-cycle engines for waste heat recovery-to-power generation," Applied Energy, Elsevier, vol. 154(C), pages 26-34.
    9. Sahu, Mithilesh Kumar & Sanjay,, 2017. "Comparative exergoeconomic analysis of basic and reheat gas turbine with air film blade cooling," Energy, Elsevier, vol. 132(C), pages 160-170.
    10. Mohapatra, Alok Ku & Sanjay,, 2014. "Thermodynamic assessment of impact of inlet air cooling techniques on gas turbine and combined cycle performance," Energy, Elsevier, vol. 68(C), pages 191-203.
    11. Selwynraj, A. Immanuel & Iniyan, S. & Polonsky, Guy & Suganthi, L. & Kribus, Abraham, 2015. "Exergy analysis and annual exergetic performance evaluation of solar hybrid STIG (steam injected gas turbine) cycle for Indian conditions," Energy, Elsevier, vol. 80(C), pages 414-427.
    12. Naserabad, S. Nikbakht & Mehrpanahi, A. & Ahmadi, G., 2018. "Multi-objective optimization of HRSG configurations on the steam power plant repowering specifications," Energy, Elsevier, vol. 159(C), pages 277-293.
    13. Kumari, Anupam & Sanjay,, 2015. "Investigation of parameters affecting exergy and emission performance of basic and intercooled gas turbine cycles," Energy, Elsevier, vol. 90(P1), pages 525-536.
    14. 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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