Journal
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
Volume 10, Issue -, Pages 510-519Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijggc.2012.07.016
Keywords
Carbon dioxide; Capture; Calcium oxide; Sorbent; Calcium looping
Categories
Funding
- Australia Research Council [DP0770048]
- Department of Resources, Energy and Tourism under the Joint Coordination Group on Clean Coal Technology Project Scheme
- National Natural Science Foundation of China [50976090]
- China Scholarship Council (CSC)
- Australian Research Council [DP0770048] Funding Source: Australian Research Council
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Calcium based sorbents are effective for CO2 capture. In this work, a modified grain size model has been developed to simulate the carbonation behavior of a calcium-magnesium based sorbent used for CO2 capture in the calcium looping process. The sorbent particle is comprised of CaO fine particles supported on porous magnesium oxide (MgO) (CGMG) framework. The model is based on the reversible reaction between CaO and CO2 and can predict the overall calcium oxide (CaO) conversion and temperature variation inside the sorbent particle under the calcium looping conditions. The overall conversion obtained by the model shows good agreement with experimental data. The effect of several parameters is also numerically analyzed on the dynamics of CaO conversion inside the particle. The conversion of CaO mainly depends on particle size, reaction temperature, CaO content and its porosity for this particular CGMG sorbent. The carbonation reaction does not generate a significant temperature increase inside the particle with a maximum increment of below 20K. Moreover, the CGMG particle carbonation shows a two stage control behavior while the heat transfer due to convection is significant. (c) 2012 Elsevier Ltd. All rights reserved.
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