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Adapting the MgO-CO 2 Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO 3 Content

Author

Listed:
  • Seon Tae Kim

    (Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, Japan)

  • Haruka Miura

    (Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, Japan)

  • Hiroki Takasu

    (Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, Japan)

  • Yukitaka Kato

    (Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, Japan)

  • Alexandr Shkatulov

    (Department of Applied Physics, Eindhoven University of Technology, De Rondom 70, 5612 AP Eindhoven, The Netherlands)

  • Yuri Aristov

    (Tokyo Institute of Technology, 2-12-1-N1-22, Ōokayama, Meguro-ku, Tokyo 152-8550, Japan
    Boreskov Institute of Catalysis, Ac. Lavrentiev av. 5, Novosibirsk 630090, Russia)

Abstract

The MgO-CO 2 working pair has been regarded as prospective for thermochemical energy storage (TCES) due to its relatively high heat storage capacity, low cost, and wide availability. This study is aimed at the optimization of the molar salt content, α , for the MgO modified with the eutectic mixture of LiNO 3 and KNO 3 (Li 0.42 K 0.58 NO 3 ) which was earlier shown to provide high conversion, Δ x , in heat-storage/release processes at 300–400 °C. The composites that have different salt content were prepared and carbonation kinetics was investigated under various conditions (carbonation temperature, T carb. , is 290–360 °C and CO 2 pressure, P (CO 2 ), is 50–101 kPa). Significant accelerating effect was revealed at α ≥ 0.05, and the Δ x value was maximized at α = 0.10–0.20. The largest conversion of 0.70 was detected at α = 0.10 and T carb. = 350 °C that corresponds to the specific useful heat ( Q comp. ) is 1.63 MJ/kg-composite. However, the salt content of 0.20 ensures the high conversion, Δ x = 0.63–0.67 and Q comp. = 1.18–1.25 MJ/kg-composite in the whole temperature range between 290 and 350 °C. The (LiK)NO 3 /MgO composite with an optimal salt content of 0.20 exhibits reasonable durability through cyclic experiment at 330 °C, namely, the stabilized reacted conversion Δ x = 0.34 ( Q comp. = 0.64 MJ/kg-composite). The studied (Li 0.42 K 0.58 )NO 3 promoted MgO-CO 2 working pair has good potential as thermochemical storage material of middle temperature heat (300–400 °C).

Suggested Citation

  • Seon Tae Kim & Haruka Miura & Hiroki Takasu & Yukitaka Kato & Alexandr Shkatulov & Yuri Aristov, 2019. "Adapting the MgO-CO 2 Working Pair for Thermochemical Energy Storage by Doping with Salts: Effect of the (LiK)NO 3 Content," Energies, MDPI, vol. 12(12), pages 1-13, June.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:12:p:2262-:d:239446
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    References listed on IDEAS

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    2. Michela Lanchi & Luca Turchetti & Salvatore Sau & Raffaele Liberatore & Stefano Cerbelli & Maria Anna Murmura & Maria Cristina Annesini, 2020. "A Discussion of Possible Approaches to the Integration of Thermochemical Storage Systems in Concentrating Solar Power Plants," Energies, MDPI, vol. 13(18), pages 1-26, September.
    3. Sunku Prasad, J. & Muthukumar, P. & Desai, Fenil & Basu, Dipankar N. & Rahman, Muhammad M., 2019. "A critical review of high-temperature reversible thermochemical energy storage systems," Applied Energy, Elsevier, vol. 254(C).
    4. Lu, Yupeng & Xuan, Yimin & Teng, Liang & Liu, Jingrui & Wang, Busheng, 2024. "A cascaded thermochemical energy storage system enabling performance enhancement of concentrated solar power plants," Energy, Elsevier, vol. 288(C).

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