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Dynamic modelling and start-up operation of a solar-assisted recompression supercritical CO2 Brayton power cycle

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  • Luu, Minh Tri
  • Milani, Dia
  • McNaughton, Robbie
  • Abbas, Ali

Abstract

In this paper, we propose and analyse a start-up scheme that can be used to bring a solar-assisted recompression sCO2 Brayton cycle from cold-start to full-load operation (i.e. design point). For this purpose, a comprehensive dynamic model for the entire solar integrated process is developed. It is found that the proposed scheme (consisting of four consecutive operational phases) can successfully bring the cycle to full-load operation in-line with the peak hours of solar energy harvesting. This scheme is featured with the flexibility of using fossil fuel and/or solar energy when appropriate process controls are in place. By utilising the CO2 pressure-temperature-density diagram, an effective strategy is developed and integrated with the start-up scheme for guiding the cycle through the transient period and sustaining the supercritical phase. During full-load operation, there can be unexpected incidents, e.g. loss of charge (LOC). It is found that the LOC event decreases the CO2 cumulative mass of the cycle and consequently reduces the overall solar energy utilization of the system. The sCO2 recompression Brayton cycle intrinsically shows high tolerance to the loss of CO2, thus the supercritical phase can mostly be sustained during a possible LOC event.

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  • Luu, Minh Tri & Milani, Dia & McNaughton, Robbie & Abbas, Ali, 2017. "Dynamic modelling and start-up operation of a solar-assisted recompression supercritical CO2 Brayton power cycle," Applied Energy, Elsevier, vol. 199(C), pages 247-263.
    • Handle: RePEc:eee:appene:v:199:y:2017:i:c:p:247-263
    DOI: 10.1016/j.apenergy.2017.04.073
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    18. Ehsan, M. Monjurul & Duniam, Sam & Li, Jishun & Guan, Zhiqiang & Gurgenci, Hal & Klimenko, Alexander, 2019. "Effect of cooling system design on the performance of the recompression CO2 cycle for concentrated solar power application," Energy, Elsevier, vol. 180(C), pages 480-494.
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    20. Ehsan, M. Monjurul & Guan, Zhiqiang & Gurgenci, Hal & Klimenko, Alexander, 2020. "Feasibility of dry cooling in supercritical CO2 power cycle in concentrated solar power application: Review and a case study," Renewable and Sustainable Energy Reviews, Elsevier, vol. 132(C).
    21. Milani, Dia & Luu, Minh Tri & Nelson, Scott & Abbas, Ali, 2022. "Process control strategies for solar-powered carbon capture under transient solar conditions," Energy, Elsevier, vol. 239(PE).
    22. Liese, Eric & Albright, Jacob & Zitney, Stephen A., 2020. "Startup, shutdown, and load-following simulations of a 10 MWe supercritical CO2 recompression closed Brayton cycle," Applied Energy, Elsevier, vol. 277(C).
    23. Jiang, Yuan & Liese, Eric & Zitney, Stephen E. & Bhattacharyya, Debangsu, 2018. "Design and dynamic modeling of printed circuit heat exchangers for supercritical carbon dioxide Brayton power cycles," Applied Energy, Elsevier, vol. 231(C), pages 1019-1032.
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