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Performance analysis of an integrated gas-, steam- and organic fluid-cycle thermal power plant

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  • Oko, C.O.C.
  • Njoku, I.H.

Abstract

This paper presents the performance analysis of an existing combined cycle power plant augmented with a waste heat fired organic Rankine cycle power plant for extra power generation. This was achieved by performing energy and exergy analysis of the integrated gas-, steam- and organic fluid-cycle thermal power plant (IPP). Heat source for the subcritical organic Rankine cycle (ORC) was the exhaust flue gases from the heat recovery steam generators of a 650 MW natural gas fired combined cycle power plant. The results showed that extra 12.4 MW of electricity was generated from the attached ORC unit using HFE7100 as working fluid. To select ORC working fluid, ten isentropic fluids were screened and HFE7100 produced the highest net power output and cycle efficiency. Exergy and energy efficiencies of the IPP improved by 1.95% and 1.93%, respectively. The rate of exergy destruction in the existing combined cycle plant was highest in the combustion chamber, 59%, whereas in the ORC, the highest rate of exergy destruction occurred in the evaporator, 62%. Simulations showed exergy efficiency of the IPP decreased with increasing ambient temperature. Exit stack flue gas temperature reduced from 126 °C in the combined cycle power plant to 100 °C in the integrated power plant.

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  • Oko, C.O.C. & Njoku, I.H., 2017. "Performance analysis of an integrated gas-, steam- and organic fluid-cycle thermal power plant," Energy, Elsevier, vol. 122(C), pages 431-443.
    • Handle: RePEc:eee:energy:v:122:y:2017:i:c:p:431-443
    DOI: 10.1016/j.energy.2017.01.107
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