 A thermodynamic system of coal-fired power unit coupled S–CO2 energy-storage cycleLihua Cao, Xiaoli Li and Di Wang Energy, 2022, vol. 259, issue C Abstract: An S–CO2 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–CO2 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–CO2 flow rate and the compressor/turbine pressure ratio have a significant impact. For example, a 5 kg/s increase in S–CO2 mass flow rate improves the RTE by roughly 5%. Furthermore, the system RTE increases by about 10% when the S–CO2 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–CO2 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. Keywords: S-CO2; Coal-fired power unit; Energy-storage; Thermodynamic system; Technical-economic analysis (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:259:y:2022:i:c:s0360544222019120 DOI: 10.1016/j.energy.2022.125015 Access Statistics for this article Energy is currently edited by Henrik Lund and Mark J. Kaiser More articles in Energy from Elsevier |
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