Journal of Applied Science and Engineering

Published by Tamkang University Press


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Pilaiwan Chaiwang1, Chattan Sakaunnapaporn1, Teerawat Sema1,2, Pornpote Piumsomboon1,2, Benjapon Chalermsinsuwan This email address is being protected from spambots. You need JavaScript enabled to view it.1,2,3

1Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
2Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
3Advanced Computational Fluid Dynamics Research Unit, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand


Received: November 19, 2019
Accepted: January 16, 2020
Publication Date: June 1, 2020

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In this study, two-dimensional computational fluid dynamics (CFD) simulations of carbon dioxide (CO2) adsorption and regeneration processes in a circulating fluidized bed were investigated. Potassium carbonate (K2CO3) was used as solid sorbent particles. The results were validated with the released outlet CO2 mass fraction and the differential pressure based on a laboratory scale circulating fluidized bed. Three different reaction models including homogeneous model, deactivation model and equilibrium model were examined in order to validate the simulated CO2 adsorption performance. The results showed that the simulated data obtained from equilibrium model was found to be well correspondence with the experimental results. Thus, the equilibrium model was then applied in the CO2 desorption processes. To determine the significance of main operating parameter factors on a considered response, the central composite design (CCD) approach was used. The four factors of gas inlet velocity, solid circulation rate, temperature and water vapor content were selected as the independent factors for CO2 adsorption. The results showed that solid circulation rate and temperature were the two significant operating factors affecting the CO2 removal performance. Additionally, three factors, which were temperature, gas inlet velocity and solid circulation rate, were selected as independent factors on the desorbed CO2 mass fraction in the downer reactor. The simulated results showed that the most significant operating factors on the CO2 desorbed was gas inlet velocity. Consequently, the suitable operating conditions were proposed through the response surface method for both the CO2 adsorption and solid sorbent regeneration.

Keywords: CFD simulation; CO2 capture; Circulating fluidized bed; Statistical experimental design.



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