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Sulfation rates of cycled CaO particles in the carbonator of a Ca‐looping cycle for postcombustion CO 2 capture
Author(s) -
Arias B.,
Cordero J. M.,
Alonso M.,
Abanades J. C.
Publication year - 2012
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.12745
Subject(s) - sorbent , carbonation , sulfation , calcination , calcium looping , flue gas , chemistry , chemical engineering , work (physics) , thermodynamics , adsorption , catalysis , organic chemistry , physics , engineering , biochemistry
Calcium looping is an energy‐efficient CO 2 capture technology that uses CaO as a regenerable sorbent. One of the advantages of Ca‐looping compared with other postcombustion technologies is the possibility of operating with flue gases that have a high SO 2 content. However, experimental information on sulfation reaction rates of cycled particles in the conditions typical of a carbonator reactor is scarce. This work aims to define a semiempirical sulfation reaction model at particle level suitable for such reaction conditions. The pore blocking mechanism typically observed during the sulfation reaction of fresh calcined limestones is not observed in the case of highly cycled sorbents ( N > 20) and the low values of sulfation conversion characteristic of the sorbent in the Ca‐looping system. The random pore model is able to predict reasonably well, the CaO conversion to CaSO 4 taking into account the evolution of the pore structure during the calcination/carbonation cycles. The intrinsic reaction parameters derived for chemical and diffusion controlled regimes are in agreement with those found in the literature for sulfation in other systems. © 2011 American Institute of Chemical EngineersAIChE J, 2012