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Role of particle size on the multicycle calcium looping activity of limestone for thermochemical energy storage

AuthorsDurán-Martín, J.D.; Sánchez-Jiménez, P.E. ; Valverde, J.M.; Perejón, Antonio ; Arcenegui-Troya, J.; García Triñanes, P.; Pérez-Maqueda, Luis A.
KeywordsConcentrated solar power
Calcium looping
Energy storage
Calcium oxide
Calcium carbonate.
Issue Date2020
CitationJournal of Advanced Research 22: 67- 76 (2020)
AbstractThe calcium looping process, based on the reversible reaction between CaCO and CaO, is recently attracting a great deal of interest as a promising thermochemical energy storage system to be integrated in Concentrated Solar Power plants (CaL-CSP). The main drawbacks of the system are the incomplete conversion of CaO and its sintering-induced deactivation. In this work, the influence of particle size in these deactivation mechanisms has been assessed by performing experimental multicycle tests using standard limestone particles of well-defined and narrow particle size distributions. The results indicate that CaO multicycle conversion benefits from the use of small particles mainly when the calcination is carried out in helium at low temperature. Yet, the enhancement is only significant for particles below 15 μm. On the other hand, the strong sintering induced by calcining in CO at high temperatures makes particle size much less relevant for the multicycle performance. Finally, SEM imaging reveals that the mechanism responsible for the loss of activity is mainly pore-plugging when calcination is performed in helium, whereas extensive loss of surface area due to sintering is responsible for the deactivation when calcination is carried out in CO at high temperature.
Publisher version (URL)http://dx.doi.org/10.1016/j.jare.2019.10.008
Identifiersdoi: 10.1016/j.jare.2019.10.008
issn: 2090-1232
Appears in Collections:(ICMS) Artículos
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