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Thermodynamic analysis of a novel integrated solar combined cycle

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  • Li, Yuanyuan
  • Yang, Yongping

Abstract

Integrated solar combined cycle (ISCC) systems have become more and more popular due to their high fuel and solar energy utilization efficiencies. Conventional ISCC systems with direct steam generation (DSG) have only one-stage solar input. A novel ISCC with DSG system has been proposed and analyzed in this paper. The new system consists two-stage solar input, which would significantly increase solar share in the total power output. Moreover, how and where solar energy is input into ISCC system would have impact on the solar and system overall efficiencies, which have been analyzed in the paper. It has been found that using solar heat to supply latent heat for vaporization of feedwater would be superior to that to be used for sensible heating purposes (e.g. Superheating steam). The study shows that: (1) producing both the high- and low-pressure saturated steam in the DSG trough collector could be an efficient way to improve process and system performance; (2) for a given live steam pressure, the optimum secondary and reheat steam conditions could be matched to reach the highest system thermal efficiency and net solar-to-electricity efficiency; (3) the net solar-to-electricity efficiency could reach up to 30% in the novel two-stage ISCC system, higher than that in the one-stage ISCC power plant; (4) compared with the conventional combined cycle gas turbine (CCGT) power system, lower stack temperature could be achieved, owing to the elimination of the approach-temperature-difference constraint, resulting in better thermal match in the heat recovery steam generator (HRSG) and thus more feedwater could be circulated.

Suggested Citation

  • Li, Yuanyuan & Yang, Yongping, 2014. "Thermodynamic analysis of a novel integrated solar combined cycle," Applied Energy, Elsevier, vol. 122(C), pages 133-142.
    • Handle: RePEc:eee:appene:v:122:y:2014:i:c:p:133-142
    DOI: 10.1016/j.apenergy.2014.02.017
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    References listed on IDEAS

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