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Application of the random pore model to the carbonation cyclic reaction

✍ Scribed by Gemma Grasa; Ramón Murillo; Mónica Alonso; J. Carlos Abanades

Publisher
American Institute of Chemical Engineers
Year
2009
Tongue
English
Weight
185 KB
Volume
55
Category
Article
ISSN
0001-1541

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✦ Synopsis

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

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