Modeling of carbonation reaction kinetics in calcium looping process for CO2 capture based on different models

Document Type : Research Paper

Authors

Faculty of Chemical & Petroleum Engineering, University of Tabriz, Iran.

Abstract

Carbonation reaction in the calcium looping is a chemical process in which carbon dioxide reacts with solid calcium oxide, resulting in the production of calcium carbonate. This reaction holds significant importance as an effective method for reducing the concentration of carbon dioxide present in the atmosphere and rapid controlling of climatic changes.The carbonation reaction at two temperatures of 550 and 650°C was modeled using kinetic models of shrinking core, random pore and fractal-like. Kinetic and diffusion constants, which are two important parameters in the chemical and diffusion in the product layer controlling stages, were calculated based on experimental data. The results showed that paying no attention to the slow diffusion stage at 650°C in shrinking core model leads to increase of difference between the predicted and experimental data until 5% at the end of reaction. The results of random pore model showed that despite considering the slow stage, the fracture appeared in the model caused a 3% difference between the predicted and experimental data at the beginning of the slow stage, reached to about 5% at the end of reaction. The fractal-like model results were completely consistent with the experimental data and only a 1.5% difference was observed at the final minutes of reaction. The fractal-like model was applied to predict the carbonation reaction conversion up to 30 consecutive cycles at 650°C. The results showed that due to the sharp decrease in the free surface of the adsorbent in the early moments, as expected, the conversion percentage decreased by 38%between cycles 1 and 10, and then decreased and reached to 4% for cycles between 20 and 30.

Keywords

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References

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Journal of Petroleum Research
Volume 33, Issue 133 - Serial Number 133
January and February 2024
Pages 85-96

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