Integrating compressed CO(2 )energy storage in an oxy-coal combustion power plant with CO2 capture

To compensate for the high cost of CO2 capture, this study proposes a novel solution that integrates a compressed CO2 energy storage (CCES) system into an oxy-coal combustion power plant with CO2 capture (Oxy_CCES). The integration of energy storage has the potential to create arbitrage from variati...

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Veröffentlicht in:Energy (Oxford) 2022, Vol.254
Hauptverfasser: Huang, Qingxi, Yao, Jinduo, Hu, Yukun, Liu, Shengchun, Li, Hailong, Sun, Qie
Format: Artikel
Sprache:eng
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Zusammenfassung:To compensate for the high cost of CO2 capture, this study proposes a novel solution that integrates a compressed CO2 energy storage (CCES) system into an oxy-coal combustion power plant with CO2 capture (Oxy_CCES). The integration of energy storage has the potential to create arbitrage from variations in electricity prices. The proposed Oxy_CCES system can achieve a higher net efficiency of 34.1%, and a higher exergy efficiency of 57.5%, than that of a liquified oxygen storage-integrated oxy-coal combustion power plant (Oxy_O-2). Two scenarios, i.e., retrofitting an existing oxy-coal combustion power plant (S-I) and building a new plant (S-II), were established to compare the Oxy_CCES and Oxy_O-2. In S-I, the payback time of the Oxy_CCES is one year and in the S-II the levelized cost of electricity (LCOE) of the Oxy_CCES increases by 1.8%, which is lower than that of the Oxy_O-2. The sensitivity analysis shows that, when the difference between the peak and the valley electricity prices and the capacities of the energy storage systems increase by 50%, the net present value (NPV) and LCOE of the Oxy_CCES system increase by 113.4% and 1.7% respectively, which are lower than the NPV and LCOE increase of the Oxy_O-2.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2022.124493