Experimental Study on Heat Recovery in a CaO/Ca(OH) 2 -Based Mechanical Fluidized Bed Thermochemical Energy Storage Reactor

Viktor Kühl (), Marc Linder and Matthias Schmidt
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Viktor Kühl: German Aerospace Center (DLR e.V.), Institute of Engineering Thermodynamics, Linder Höhe, 51147 Cologne, Germany
Marc Linder: German Aerospace Center (DLR e.V.), Institute of Engineering Thermodynamics, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
Matthias Schmidt: German Aerospace Center (DLR e.V.), Institute of Engineering Thermodynamics, Linder Höhe, 51147 Cologne, Germany

Energies, 2024, vol. 17, issue 19, 1-17

Abstract: Long-term storage of seasonally available solar energy and its provision to balance heating energy demand can contribute significantly to the sustainable use of energy resources. Thermochemical energy storage is a suitable process for this purpose, offering the possibility of loss-free long-term energy storing and heat supply. In order to develop suitable technical solutions for the use of this technology, novel reactor concepts and scientific questions regarding material and technology development are being investigated. In this publication, the energy storage process of a long-term energy storage system based on a ploughshare reactor is experimentally investigated under various technically relevant operating conditions. One specific aspect of this technology is related to the release of water vapour during the charging process. Therefore, this work focusses, in particular, on the possibility of technically utilizing the latent heat of the released water vapour in the range of 45 °C to 80 °C, which covers the operating requirements of common heating systems in households. The experiments have shown that the dehydration process enables the separation of two heat fluxes: the chemically bound energy for long-term storage and the physically (sensible and latent) stored energy for short-term applications. However, the limitation of gas transport was also identified as the most important influencing parameter for optimising the performance of the process.

Keywords: thermochemical energy storage; calcium oxide/hydroxide; mechanically fluidized bed reactor; latent heat recovery; long-term energy storage; renewable heating (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: 2024
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