Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 53 5 2021 07 23 Modeling the calcium looping process with an emphasis on the bed hydrodynamics and sorbent characteristics Modeling the calcium looping process with an emphasis on the bed hydrodynamics and sorbent characteristics 2807 2820 3916 10.22060/mej.2020.17363.6583 FA Fardin Sattari Faculty of Chemical & Petroleum Engineering, University of Tabriz, Tabriz, Iran Maryam Tahmasebpour تبریز-مهندسی شیمی Mousa Mohammadpourfard Associate Professor, Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran. Zip code: 5166616471. Tel/Fax: +984133393146. Journal Article 2019 11 12 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. 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. https://mej.aut.ac.ir/article_3916_49cbb75927723efba3b4c108ed4a12f3.pdf