Two-Phase Fluidized Bed Model for Pressurized Carbonation Kinetics of Calcium Oxide

Title: Two-Phase Fluidized Bed Model for Pressurized Carbonation Kinetics of Calcium Oxide
Authors: Yao, JG
Fennell, PS
Maitland, GC
Zhang, Z
Sceats, M
Item Type: Journal Article
Abstract: A two-phase reactor model has been developed using a system of ordinary differential equations in MATLAB to model the carbonation reaction and therefore determine the kinetics of calcium oxide in a pressurised fluidised bed reactor as part of the calcium looping cycle. The model assumes that the particulate and bubble phases are modelled as a CSTR and a PFR respectively. The random pore model developed by Bhatia and Perlmutter1 is incorporated into the system of equations to predict the rate of carbonation for pressures up to 5 bara total, and CO2 partial pressures up to 150 kPa. The surface rate constant and product layer diffusivity in the random pore model expression were obtained by fitting the model to experimental data for a range of pressures, CO2 concentrations and temperatures by minimization of the resid-ual sum of squares. The surface rate constants were found to be between 3.05 and 12.9 x 10-10 m4 mol-1 s-1 for a temper-ature range of 550 to 750 °C. The product layer diffusivities were found to be between 0.06 and 23.6 x 10-13 m2 s-1 for the same temperature range. The surface rate constant and product layer diffusivity activation energy were calculated using the Arrhenius e
Issue Date: 19-Sep-2017
Date of Acceptance: 19-Sep-2017
URI: http://hdl.handle.net/10044/1/51047
DOI: https://dx.doi.org/10.1021/acs.energyfuels.7b01384
ISSN: 0887-0624
Publisher: American Chemical Society
Start Page: 11181
End Page: 11193
Journal / Book Title: Energy and Fuels
Volume: 31
Issue: 10
Copyright Statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Energy and Fuels, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html]
Keywords: 03 Chemical Sciences
09 Engineering
Energy
Publication Status: Published
Appears in Collections:Faculty of Engineering
Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences



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