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Modeling of Combined Lead Fast Reactor and Concentrating Solar Power Supercritical Carbon Dioxide Cycles to Demonstrate Feasibility, Efficiency Gains, and Cost Reductions

Author

Listed:
  • Brian T. White

    (Department of Mechanical Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI 53706, USA)

  • Michael J. Wagner

    (Department of Mechanical Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI 53706, USA)

  • Ty Neises

    (National Renewable Energy Laboratory, Thermal Systems Group, 15013 Denver West Parkway, Golden, CO 80401, USA)

  • Cory Stansbury

    (Westinghouse Electric Company, Lead Fast Reactor Systems Development, 1000 Westinghouse Dr, Cranberry Twp, PA 16066, USA)

  • Ben Lindley

    (Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706, USA)

Abstract

Solar power has innate issues with weather, grid demand and time of day, which can be mitigated through use of thermal energy storage for concentrating solar power (CSP). Nuclear reactors, including lead-cooled fast reactors (LFRs), can adjust power output according to demand; but with high fixed costs and low operating costs, there may not be sufficient economic incentive to make this worthwhile. We investigate potential synergies through coupling CSP and LFR together in a single supercritical CO 2 Brayton cycle and/or using the same thermal energy storage. Combining these cycles allows for the LFR to thermally charge the salt storage in the CSP cycle during low-demand periods to be dispatched when grid demand increases. The LFR/CSP coupling into one cycle is modeled to find the preferred location of the LFR heat exchanger, CSP heat exchanger, sCO 2 -to-salt heat exchanger (C2S), turbines, and recuperators within the supercritical CO 2 Brayton cycle. Three cycle configurations have been studied: two-cycle configuration, which uses CSP and LFR heat for dedicated turbocompressors, has the highest efficiencies but with less component synergies; a combined cycle with CSP and LFR heat sources in parallel is the simplest with the lowest efficiencies; and a combined cycle with separate high-temperature recuperators for both the CSP and LFR is a compromise between efficiency and component synergies. Additionally, four thermal energy storage charging techniques are studied: the turbine positioned before C2S, requiring a high LFR outlet temperature for viability; the turbine after the C2S, reducing turbine inlet temperature and therefore power; the turbine parallel to the C2S producing moderate efficiency; and a dedicated circulator loop. While all configurations have pros and cons, use of a single cycle offers component synergies with limited efficiency penalty. Using a turbine in parallel with the C2S heat exchanger is feasible but results in a low charging efficiency, while a dedicated circulator loop offers flexibility and near-perfect heat storage efficiency but increasing cost with additional cycle components.

Suggested Citation

  • Brian T. White & Michael J. Wagner & Ty Neises & Cory Stansbury & Ben Lindley, 2021. "Modeling of Combined Lead Fast Reactor and Concentrating Solar Power Supercritical Carbon Dioxide Cycles to Demonstrate Feasibility, Efficiency Gains, and Cost Reductions," Sustainability, MDPI, vol. 13(22), pages 1-24, November.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:22:p:12428-:d:676260
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    References listed on IDEAS

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    1. Wang, Gang & Wang, Cheng & Chen, Zeshao & Hu, Peng, 2020. "Design and performance evaluation of an innovative solar-nuclear complementarity power system using the S–CO2 Brayton cycle," Energy, Elsevier, vol. 197(C).
    2. Wang, Kun & Li, Ming-Jia & Guo, Jia-Qi & Li, Peiwen & Liu, Zhan-Bin, 2018. "A systematic comparison of different S-CO2 Brayton cycle layouts based on multi-objective optimization for applications in solar power tower plants," Applied Energy, Elsevier, vol. 212(C), pages 109-121.
    3. Iverson, Brian D. & Conboy, Thomas M. & Pasch, James J. & Kruizenga, Alan M., 2013. "Supercritical CO2 Brayton cycles for solar-thermal energy," Applied Energy, Elsevier, vol. 111(C), pages 957-970.
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    Cited by:

    1. Gabriel J. Soto & Ben Lindley & Ty Neises & Cory Stansbury & Michael J. Wagner, 2022. "Dispatch Optimization, System Design and Cost Benefit Analysis of a Nuclear Reactor with Molten Salt Thermal Storage," Energies, MDPI, vol. 15(10), pages 1-23, May.

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