Non-Stoichiometric Redox Thermochemical Energy Storage Analysis for High Temperature Applications

Timo Roeder (), Kai Risthaus, Nathalie Monnerie and Christian Sattler
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Timo Roeder: Deutsches Zentrum für Luft-und Raumfahrt (German Aerospace Center)—DLR, Institute of Future Fuels, Linder Höhe, 51147 Cologne, Germany
Kai Risthaus: Deutsches Zentrum für Luft-und Raumfahrt (German Aerospace Center)—DLR, Institute of Future Fuels, Linder Höhe, 51147 Cologne, Germany
Nathalie Monnerie: Deutsches Zentrum für Luft-und Raumfahrt (German Aerospace Center)—DLR, Institute of Future Fuels, Linder Höhe, 51147 Cologne, Germany
Christian Sattler: Deutsches Zentrum für Luft-und Raumfahrt (German Aerospace Center)—DLR, Institute of Future Fuels, Linder Höhe, 51147 Cologne, Germany

Energies, 2022, vol. 15, issue 16, 1-21

Abstract: Concentrated solar power is capable of providing high-temperature process streams to different applications. One promising application is the high-temperature electrolysis process demanding steam and air above 800 °C. To overcome the intermittence of solar energy, energy storage is required. Currently, thermal energy at such temperatures can be stored predominately as sensible heat in packed beds. However, such storage suffers from a loss of usable storage capacity after several cycles. To improve such storage, a one-dimensional packed bed thermal energy storage model using air as a heat transfer medium is set up and used to investigate and quantify the benefit of the incorporation of different thermochemical materials from the class of perovskites. Perovskites undergo a non-stoichiometric reaction extension which offers the utilization of thermochemical heat over a larger temperature range. Three different perovskites were considered: SrFeO 3 , CaMnO 3 and Ca 0.8 Sr 0.2 MnO 3 . In total, 15 vol% of sensible energy storage has been replaced by one perovskite and different positions of the reactive material are analyzed. The effect of reactive heat on storage performance and thermal degradation over 15 consecutive charging and discharging cycles is studied. Based on the selected variation and reactive material, storage capacity and useful energy capacity are increased. The partial replacement close to the cold inlet/outlet of the storage system can increase the overall storage capacity by 10.42%. To fully utilize the advantages of thermochemical material, suitable operation conditions and a fitting placement of the material are vital.

Keywords: thermal energy storage; thermochemical energy; packed bed; perovskites; solar energy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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