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

The 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.

Bibliographic Details

Main Authors:	Álvarez Criado, Yolanda, Huille, Alfred, Rougé, Sylvie, Abanades García, Juan Carlos
Other Authors:	European Commission
Format:	artículo biblioteca
Language:	English
Published:	Elsevier 2016-11-04
Subjects:	Thermochemical energy storage, Fluidized bed reactor, Pilot plant, CaO hydration, Ca(OH)2 dehydration, Reactor model,
Online Access:	http://hdl.handle.net/10261/143922 http://dx.doi.org/10.13039/501100000780
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