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A Thermodynamic System of Coal-Fired Power Unit Coupled S-Co2 Energy-Storage Cycle

SSRN, ISSN: 1556-5068
2022
  • 2
    Citations
  • 184
    Usage
  • 0
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    2
    • Citation Indexes
      2
  • Usage
    184
    • Abstract Views
      158
    • Downloads
      26

Article Description

An S-CO 2 energy-storage cycle system is added to a 660 MW coal-fired power unit to increase operational flexibility. With a round-trip efficiency ( RTE ) of 56.14%, a thermodynamic system for coal-fired units (with an additional S-CO 2 energy-storage cycle) is built. Turbine extraction steam was used as energy source for the energy-storage system. An analysis of the impact of different factors on the thermodynamic system-performance reveals that both the S-CO 2 flow rate and the compressor/turbine pressure ratio have a significant impact. For example, a 5 kg/s increase in S-CO 2 mass flow rate improves the RTE by roughly 5%. Furthermore, the system RTE increases by about 10% when the S-CO 2 turbine pressure ratio was increased by 1.0. The higher the steam temperature of the energy-storage source, the lower the RTE . Moreover, the effect of both S-CO 2 flow rate and turbine pressure ratio on the system investment cost and payback period is determined based on a technical and economic analysis. This study provides a reference that can be used to improve the operational flexibility of coal-fired power units.

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