Modelling of the calcination behaviour of a uniformly-distributed CuO/CaCO3 particle in Ca-Cu chemical looping

Qin, Changlei, Yin, Junjun, Feng, Bo, Ran, Jingyu, Zhang, Li and Manovic, Vasilije (2016) Modelling of the calcination behaviour of a uniformly-distributed CuO/CaCO3 particle in Ca-Cu chemical looping. Applied Energy, 164 400-410. doi:10.1016/j.apenergy.2015.11.059


Author Qin, Changlei
Yin, Junjun
Feng, Bo
Ran, Jingyu
Zhang, Li
Manovic, Vasilije
Title Modelling of the calcination behaviour of a uniformly-distributed CuO/CaCO3 particle in Ca-Cu chemical looping
Formatted title
Modelling of the calcination behaviour of a uniformly-distributed CuO/CaCO3 particle in Ca-Cu chemical looping
Journal name Applied Energy   Check publisher's open access policy
ISSN 0306-2619
1872-9118
Publication date 2016-02-15
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.apenergy.2015.11.059
Open Access Status Not yet assessed
Volume 164
Start page 400
End page 410
Total pages 11
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Subject 2205 Civil and Structural Engineering
2215 Building and Construction
2100 Energy
2210 Mechanical Engineering
2308 Management, Monitoring, Policy and Law
Abstract Ca-Cu chemical looping (CaL-CLC), consisting of calcination (regeneration), carbonation, and oxidation stages, is a novel process with high potential for CO capture. Its implementation is largely dependent on the effective matching, transferring and utilisation of the heat generated by CuO reduction, for CaCO decomposition, where the former is an exothermic and the latter an endothermic reaction. To better understand the calcination behaviour during CaL-CLC cycles, we developed a mathematical model coupling chemical reactions, mass and heat transfer inside a spherical particle composed of a number of uniformly distributed CuO and CaCO grains. Using the model, we simulated the dynamics of CuO and CaCO conversion, the profiles of temperature and gas concentrations, and the changes in porosity and the grain size inside the particle with time. Furthermore, the influence of several key variables on calcination behaviour within the spherical particle was numerically analysed. Results show that it is better to have an ambient temperature in the range of 1198-1223K, a similar value of the initial particle temperature, and a small CaCO grain size to attain a good match between reactions of CuO and CaCO, and to avoid the onset of local superheating within the particle.
Formatted abstract
Ca–Cu chemical looping (CaL-CLC), consisting of calcination (regeneration), carbonation, and oxidation stages, is a novel process with high potential for CO2 capture. Its implementation is largely dependent on the effective matching, transferring and utilisation of the heat generated by CuO reduction, for CaCO3 decomposition, where the former is an exothermic and the latter an endothermic reaction. To better understand the calcination behaviour during CaL-CLC cycles, we developed a mathematical model coupling chemical reactions, mass and heat transfer inside a spherical particle composed of a number of uniformly distributed CuO and CaCO3 grains. Using the model, we simulated the dynamics of CuO and CaCO3 conversion, the profiles of temperature and gas concentrations, and the changes in porosity and the grain size inside the particle with time. Furthermore, the influence of several key variables on calcination behaviour within the spherical particle was numerically analysed. Results show that it is better to have an ambient temperature in the range of 1198–1223 K, a similar value of the initial particle temperature, and a small CaCO3 grain size to attain a good match between reactions of CuO and CaCO3, and to avoid the onset of local superheating within the particle.
Keyword Ca-Cu chemical looping
Calcination behaviour
CO2 capture
Composite particle model
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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