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Title

Determination of CaO carbonation kinetics under recarbonation conditions

AuthorsGrasa Adiego, Gemma ; Martínez Berges, Isabel; Diego de Paz, María Elena ; Abanades García, Juan Carlos
KeywordsCO2 capture
Regenerable sorbents
Carbonation
CO2 carrying capacity kinetic
Limestone
Issue Date28-Apr-2014
PublisherAmerican Chemical Society
CitationEnergy and Fuels (2014)
AbstractThis work investigates the kinetics of the reaction of CO 2 with CaO particles partially carbonated that are forced to increase their carbonate content at high temperatures in an atmosphere of rich CO 2 . This additional recarbonation reaction on particles that have already completed their fast carbonation stage is the basis of a novel process that aims to increase the CO 2 carrying capacity of sorbents in calcium looping CO 2 capture systems. The CaO reaction rates and the maximum carbonation conversions after the recarbonation step were measured on a thermogravimetric analyzer, and the results indicate that they are highly dependent upon the temperature and CO 2 partial pressure, with steam also being a contributing factor. The reaction mechanism governing the reaction rates during the carbonation and recarbonation reactions is explained by the combined control of the chemical reaction and CO 2 di ff usion through the CaCO 3 product layer. An extension of the random pore model adapted to multi-cycled CaO particles was successfully applied to calculate the CaO molar conversion as a function of the time and the recarbonation conditions, using kinetic parameters consistent with previously published results on carbonation kinetics under typical flue gas conditions.
Description10 pages, 6 figures, 3 tables.--Revised April 28
Publisher version (URL)http://dx.doi.org/10.1021/ef500331t
URIhttp://hdl.handle.net/10261/98456
DOI10.1021/ef500331t
ISSN0087-0624
E-ISSN1520-5029
Appears in Collections:(ICB) Artículos
(INCAR) Artículos
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