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Experimental investigation and model validation of a CaO/Ca(OH)2 fluidized bed reactor for thermochemical energy storage applications

AutorÁlvarez Criado, Yolanda ; Huille, Alfred; Rougé, Sylvie; Abanades García, Juan Carlos
Palabras claveThermochemical energy storage
Fluidized bed reactor
Pilot plant
CaO hydration
Ca(OH)2 dehydration
Reactor model
Fecha de publicación4-nov-2016
EditorElsevier
CitaciónChemical Engineering Journal 313: 1194–1205 (2017)
ResumenThe CaO/Ca(OH)2 hydration/dehydration chemical loop has long been recognized as a potential candidate for application in energy storage systems for concentrated solar plants. However, the technology still remains at a conceptual level because little information has been published on the performance of the key reactors in the system. In this work, we experimentally investigate the hydration and dehydration reactors in a 5.5 kWth batch fluidized bed reactor, in conditions relevant to larger systems (superficial gas velocities of up to 0.53 m/s, temperatures of up to 500°C for dehydration, input H2O(v) fractions between 0 and 0.8 etc.). Furthermore, to assist in the interpretation of the experimental results, a standard 1D bubbling reactor model has been formulated and fitted to the experimental results by including kinetic information at particle level independently measured in a thermogravimetric apparatus. The results indicate that the hydration reaction is mainly controlled by the slow kinetics of the CaO material tested while significant emulsion-bubble mass-transfer resistances were identified during dehydration due to the much faster dehydration kinetics.
Versión del editorhttp://dx.doi.org/10.1016/j.cej.2016.11.010
URIhttp://hdl.handle.net/10261/143922
DOI10.1016/j.cej.2016.11.010
ISSN1385-8947
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