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Performance of double source boiler with coal-fired and solar power tower heat for supercritical power generating unit

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  • Zhang, Maolong
  • Du, Xiaoze
  • Pang, Liping
  • Xu, Chao
  • Yang, Lijun

Abstract

An approach of high-efficiency utilization of solar energy was proposed, by which the high concentrated heat received by the solar tower was integrated to the supercritical coal-fired boiler. Two schemes that solar energy was used to heat superheat steam or subcooled feed water were presented. The thermodynamic and heat transfer models were established. For a practical 660 MW supercritical power generating unit, the standard coal consumption of power generation could be decreased by more than 17 g/kWh by such double source boiler. The drawbacks of both schemes were found and then were amended by adding a flue gas bypass to the boiler. It also can be concluded that the maximum solar contribution of two schemes for the gross power generation are 6.11% and 4.90%, respectively. The solar power efficiency of the re-modified designs were demonstrated be superior to that of PS10. In terms of turbine efficiency, the comparisons with Solar Two plant having similar initial temperature found that the efficiency of Scheme I was 5.25% higher than that of Solar Two while the advantage of Scheme II was existing either. Additionally, in two schemes with flue bypass when the medium was extracted, the thermal efficiency of boiler could be improved as well.

Suggested Citation

  • Zhang, Maolong & Du, Xiaoze & Pang, Liping & Xu, Chao & Yang, Lijun, 2016. "Performance of double source boiler with coal-fired and solar power tower heat for supercritical power generating unit," Energy, Elsevier, vol. 104(C), pages 64-75.
    • Handle: RePEc:eee:energy:v:104:y:2016:i:c:p:64-75
    DOI: 10.1016/j.energy.2016.03.111
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