Carbon dioxide desorption behavior of potassium carbonate supported on gamma-alumina solid sorbent in wet fluidized bed under steam atmosphere--颗粒学报PARTICUOLOGY

Angkanawisan, S., Gidaspow, D., Piumsomboon, P., & Chalermsinsuwan, B. (2023). Carbon dioxide desorption behavior of potassium carbonate supported on gamma-alumina solid sorbent in wet fluidized bed under steam atmosphere. Particuology, 81, 15-24. https://doi.org/10.1016/j.partic.2022.12.009

Carbon dioxide desorption behavior of potassium carbonate supported on gamma-alumina solid sorbent in wet fluidized bed under steam atmosphere

Sasitron Angkanawisan ^{a b}, Dimitri Gidaspow ^c, Pornpote Piumsomboon ^{a b}, Benjapon Chalermsinsuwan ^{a b d *}

a Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
b Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
c Department of Chemical and Biological Engineering, Armour College of Engineering, Illinois Institute of Technology, 10 West 35th Street, Chicago, IL, 60616, United States
d Advanced Computational Fluid Dynamics Research Unit, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand

10.1016/j.partic.2022.12.009

Volume 81, October 2023, Pages 15-24

Received 29 September 2022, Revised 3 December 2022, Accepted 15 December 2022, Available online 31 December 2022, Version of Record 6 January 2023.

E-mail: benjapon.c@chula.ac.th

Highlights

• CO₂ desorption of K₂CO₃/γ-Al₂O₃ in a wet fluidized bed was investigated using CFD.

• Effects of water thickness and dry restitution coefficient were modeled.

• Increasing water thickness obstructed the solid movement in the reactor downer.

• Increase in the dry restitution coefficient decreased the CO₂ desorption.

• Wet operating conditions gave different desorption behavior with the dry ones.

Abstract

Since the carbon dioxide (CO₂) capture using solid sorbent is a reversible reaction, the solid sorbent can be regenerated by the desorption process. Therefore, the desorption process is one of the key important processes for the CO₂ capture system. Traditionally, most of the literature studies focus on the desorption of solid sorbent under an N₂ atmosphere. However, the desorption process of the solid sorbent is inappropriate in the real system because the system will need another process to separate CO₂ and nitrogen (N₂) after the desorption process. This study focused on the CO₂ desorption of potassium carbonate supported on gamma-alumina (K₂CO₃/γ-Al₂O₃) in a wet fluidized bed under a steam atmosphere by using the multiphase computational fluid dynamics (CFD) simulation. The effects of water thickness and dry restitution coefficient on CO₂ desorption rate were investigated to provide a realistic particle collision behavior and to explore their effects on CO₂ desorption phenomena. Moreover, the effect of steam velocity on the hydrodynamic behaviors of fluidization which on CO₂ desorption rate was studied. The simulated results demonstrated that all the parameters, water thickness, dry restitution coefficient, and steam velocity had significantly affected system hydrodynamics and CO₂ desorption rate in the wet fluidization desorption process. Furthermore, the effect of desorption temperature on CO₂ desorption rate was evaluated for finding the appropriate temperature for CO₂ desorption process of K₂CO₃/γ-Al₂O₃. The results showed that the appropriate desorption temperature for CO₂ desorption under steam atmosphere was the temperature over 150 °C.

Graphical abstract

Keywords

CO₂ desorption; Fluidized bed; K₂CO₃/γ-Al₂O₃; Restitution coefficient; Wet fluidization; Computational fluid dynamics

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