Modeling the calcium looping process with an emphasis on the bed hydrodynamics and sorbent characteristics

Document Type : Research Article

Authors

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

2 تبریز-مهندسی شیمی

3 Associate Professor, Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran. Zip code: 5166616471. Tel/Fax: +984133393146.

Abstract

The calcium looping process is considered a promising technology to CO2 capture emissions from combustion plants in recent decades. To model this process, the bed hydrodynamics as well as the sorbent characteristics will affect the calcium looping efficiency. In this study, CaO/Al2O3 sorbent is first synthesized by sol-gel method and then its performance is compared with pure CaO sorbent through 20 carbonation/calcination cycles. In addition, a general model based on bed hydrodynamics as well as sorbent properties for this process is presented and then the influence of parameters such as superficial gas velocity, carbonator height and sorbent inventory on process efficiency is investigated. Thermogravimetric experiments reveal that CaO/Al2O3 sorbent preserves 73% of its activity at the end of 20 cycles, whereas it is obtained as 21 for pure CaO sorbent. The results obtained from modeling show that the adsorption efficiency is decreased from 78.69 to 22.68% for pure CaO, whereas, it is decreased from 86.5 to 74.1% for modified CaO/Al2O3 sorbent. Finally, by studying the affective parameters it is obtained that the solid inventory has a significant impact on the process efficiency while the gas velocity and the height of the carbonator are far less effective.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 5
August 2021
Pages 2807-2820

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