- Title
- Determination of carbonation/calcination reaction kinetics of a limestone sorbent in low CO₂ partial pressures using TGA experiments
- Creator
- Ramezani, Mohammad; Tremain, Priscilla; Doroodchi, Elham; Moghtaderi, Behdad
- Relation
- 13th International Conference on Greenhouse Gas Control Technologies (GHGT-13). Proceedings of the 13th International Conference on Greenhouse Gas Control Technologies [presented in Energy Procedia, Vol. 114] (Lausanne, Switzerland 14-16 November, 2017) p. 259-270
- Publisher Link
- http://dx.doi.org/10.1016/j.egypro.2017.03.1168
- Publisher
- Elsevier
- Resource Type
- conference paper
- Date
- 2017
- Description
- The carbonation/calcination reaction cycle of a limestone sorbent was used in a novel greenhouse calcium looping process to provide the heat and CO₂ requirement of greenhouses. The unique conditions of this process (low temperature and low CO₂ partial pressure) led to the determination of the carbonation/calcination reaction kinetic parameters in a temperature range of 400 to 800 °C and CO₂ partial pressures of 0.04 to 0.16% (400 to 1600 ppm) which were carried out experimentally via a thermo-gravimetric analyzer (TGA). Various gas-solid reaction mechanisms were considered to determine the best reaction mechanism for the carbonation reaction. The diffusion function or G(x) = x² had the best least-square linear fit, which resulted in a first order reaction for the carbonation reaction in the greenhouse calcium looping process. Moreover, the activation energy and pre-exponential factor of the carbonation reaction were established to be 19.7 kJ mol-1 and 295.8 min-1 kPa-1. The same methodology for reaction mechanism determination was carried out for the calcination reaction and G(x)=1-(1-x)1/3 was found to have the best linear fit. The activation energy and pre-exponential factor determined for the calcination reaction were 103.6 kJ mol-1 and 6.9 × 10⁶ min-1, respectively.
- Subject
- carbonation/calcination reaction cycle; limestone sorbent; CO₂; thermo-gravimetric analyzer; thermo-gravimetric analyzer experiments
- Identifier
- http://hdl.handle.net/1959.13/1396070
- Identifier
- uon:33986
- Identifier
- ISSN:1876-6102
- Rights
- © 2017 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
- Language
- eng
- Full Text
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