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Application of the random pore model to the carbonation cyclic reaction
Author(s) -
Grasa Gemma,
Murillo Ramón,
Alonso Mónica,
Abanades J. Carlos
Publication year - 2009
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.11746
Subject(s) - carbonation , calcination , sorbent , lime , chemical engineering , particle (ecology) , carbonatation , calcium looping , materials science , calcium oxide , reaction rate , particle size , mineralogy , chemistry , thermodynamics , composite material , adsorption , metallurgy , catalysis , geology , physics , organic chemistry , engineering , oceanography
Abstract Calcium oxide has been proved to be a suitable sorbent for high temperature CO 2 capture processes based on the cyclic carbonation‐calcination reaction. It is important to have reaction rate models that are able to describe the behavior of CaO particles with respect to the carbonation reaction. Fresh calcined lime is known to be a reactive solid toward carbonation, but the average sorbent particle in a CaO‐based CO 2 capture system experiences many carbonation‐calcination cycles and the reactivity changes with the number of cycles. This study applies the random pore model (RPM) to estimate the intrinsic rate parameters for the carbonation reaction and develops a simple model to calculate particle conversion with time as a function of the number of cycles, partial pressure of CO 2 , and temperature. This version of the RPM model integrates knowledge obtained in earlier works on intrinsic carbonation rates, critical product layer thickness, and pore structure evolution in highly cycled particles. © 2009 American Institute of Chemical Engineers AIChE J, 2009