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Proposal of solar-aided coal-fired power generation system with direct steam generation and active composite sun-tracking

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  • Wang, Ruilin
  • Sun, Jie
  • Hong, Hui

Abstract

A novel solar-aided coal-fired power generation system (SCPGS) with direct-steam-generation (DSG) solar field and active composite (AC), i.e. active off-focus plus double-axis, sun-tracking strategy is proposed, where the DSG technology is to reduce the cost and the AC sun-tracking strategy is to improve the performance. It is found that the aperture area of DSG solar field could be saved by 12.18% compared to the HTF solar field. The AC sun-tracking strategy is experimentally verified by stabilizing the heat gain (relative deviation < 2%) under DNI fluctuation (relative variation = 35%). The proposed AC-DSG SCPGS is comprehensively evaluated in references of north-south single-axis (1A) DSG, double-axis (2A) DSG and AC heat-transfer-fluid (HTF) SCPGSs. For performance, the annual solar-to-electrical efficiency of AC-DSG SCPGS is 44.33% higher than that of 1A-DSG SCPGS. For environmental impacts, the saved amounts of CO2, NOx and SO2 emissions of AC-DSG SCPGS are 38.11% more than those of 1A-DSG SCPGS. For economics, the levelized cost of electricity (LCOE) of AC-DSG SCPGS is 44.56% lower than that of AC-HTF SCPGS. Eventually, the proposed AC-DSG SCPGS comprehensively stands out of all the reference systems. The present work evidentially provides a potential way for the smart and low-cost SCPGS in future.

Suggested Citation

  • Wang, Ruilin & Sun, Jie & Hong, Hui, 2019. "Proposal of solar-aided coal-fired power generation system with direct steam generation and active composite sun-tracking," Renewable Energy, Elsevier, vol. 141(C), pages 596-612.
    • Handle: RePEc:eee:renene:v:141:y:2019:i:c:p:596-612
    DOI: 10.1016/j.renene.2019.04.013
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    5. López, Juan Camilo & Escobar, Alejandro & Cárdenas, Daniel Alejandro & Restrepo, Álvaro, 2021. "Parabolic trough or linear fresnel solar collectors? An exergy comparison of a solar-assisted sugarcane cogeneration power plant," Renewable Energy, Elsevier, vol. 165(P1), pages 139-150.
    6. Li, Chao & Zhai, Rongrong, 2024. "A novel solar tower assisted pulverized coal power system considering solar energy cascade utilization: Performance analysis and multi-objective optimization," Renewable Energy, Elsevier, vol. 222(C).

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