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Development and characteristics analysis of salt-hydrate based composite sorbent for low-grade thermochemical energy storage

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  • Li, Wei
  • Klemeš, Jiří Jaromír
  • Wang, Qiuwang
  • Zeng, Min

Abstract

Salt-hydrate based thermochemical energy storage is currently a momentous technique utilized for long-term energy storage due to the reversible gas-solid reaction under low-temperature. Among available salt candidates, LiOH·H2O is a promising thermochemical material owing to its high heat storage density of 1400 kJ/kg and low charging temperature. The expanded graphite (EG) is selected as a host matrix owing to its excellent thermal conductivity and abundant microstructure, which can promote the heat and mass transfer. This work focuses on the thermochemical performances of the form-stable LiOH·H2O/EG composite sorbents. Five samples were being synthesized with EG contents of 0, 5, 8, 12 and 15 wt%. These porous sorbents are characterized to understand the microstructure and thermophysical properties. Considering the comprehensive effect of thermal conductivity and storage density, as well as the adsorption kinetics, the 8 wt% EG-doped sample is the most favourable sorbent, which possesses the thermal conductivity of 6.92 W/(m K) and energy density of 1120 kJ/kg. The cyclability results also reveal the energy capacity of this composite maintains ∼90% of the original after ten consecutive heat charging (dehydration) and discharging (hydration), suggesting good stability. Additionally, the active energy of 2.58 × 109 s−1 and pre-exponential factor of 59.5 kJ/mol for the sorbent is derived. Finally, the thermal power of 123 W and thermal efficiency of 83.6% are achieved for the storage unit in simulation. All these results further confirmed the feasibility of the developed composite sorbent in low-grade heat storage.

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  • Li, Wei & Klemeš, Jiří Jaromír & Wang, Qiuwang & Zeng, Min, 2020. "Development and characteristics analysis of salt-hydrate based composite sorbent for low-grade thermochemical energy storage," Renewable Energy, Elsevier, vol. 157(C), pages 920-940.
    • Handle: RePEc:eee:renene:v:157:y:2020:i:c:p:920-940
    DOI: 10.1016/j.renene.2020.05.062
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    2. Honcová, Pavla & Sádovská, Galina & Pastvová, Jana & Koštál, Petr & Seidel, Jürgen & Sazama, Petr & Pilař, Radim, 2021. "Improvement of thermal energy accumulation by incorporation of carbon nanomaterial into magnesium chloride hexahydrate and magnesium nitrate hexahydrate," Renewable Energy, Elsevier, vol. 168(C), pages 1015-1026.
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    4. Marín, P.E. & Milian, Y. & Ushak, S. & Cabeza, L.F. & Grágeda, M. & Shire, G.S.F., 2021. "Lithium compounds for thermochemical energy storage: A state-of-the-art review and future trends," Renewable and Sustainable Energy Reviews, Elsevier, vol. 149(C).
    5. Lin, Shusen & Deng, Lisheng & Li, Jun & Kubota, Mitsuhiro & Kobayashi, Noriyuki & Huang, Hongyu, 2024. "Preparation and properties of activated carbon-based Na3PO4 composites for low-temperature thermochemical heat storage," Energy, Elsevier, vol. 301(C).
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    7. Li, Wei & Klemeš, Jiří Jaromír & Wang, Qiuwang & Zeng, Min, 2022. "Salt hydrate–based gas-solid thermochemical energy storage: Current progress, challenges, and perspectives," Renewable and Sustainable Energy Reviews, Elsevier, vol. 154(C).
    8. Li, Wei & Zhang, Lianjie & Klemeš, Jiří Jaromír & Wang, Qiuwang & Zeng, Min, 2022. "Thermochemical energy conversion behaviour in the corrugated heat storage unit with porous metal support," Energy, Elsevier, vol. 259(C).

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