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

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Particuology 2023年第10期81卷 15-24页

作者： sasitron angkanawisan Dimitri Gidaspow Pornpote Piumsomboon Benjapon Chalermsinsuwan Fuels Research Center Department of Chemical TechnologyFaculty of ScienceChulalongkorn University254 Phayathai RoadPathumwanBangkok10330Thailand Center of Excellence on Petrochemical and Materials Technology Chulalongkorn University254 Phayathai RoadPathumwanBangkok10330Thailand Department of Chemical and Biological Engineering Armour College of EngineeringIllinois Institute of Technology10 West 35th StreetChicagoIL60616United States Advanced Computational Fluid Dynamics Research Unit Chulalongkorn University254 Phayathai RoadPathumwanBangkok10330Thailand

Since the carbon dioxide(CO_(2))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 CO_(2)capture system.Traditionally,most of the literature studies focus on the desorption of solid sorbent under an N_(2)atmosphere.However,the desorption process of the solid sorbent is inappropriate in the real system because the system will need another process to separate CO_(2)and nitrogen(N_(2))after the desorption process.This study focused on the CO_(2)desorption of potassium carbonate supported on gamma-alumina(K2CO3/γ-Al_(2)O_(3))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 CO_(2)desorption rate were investigated to provide a realistic particle collision behavior and to explore their effects on CO_(2)desorption phenomena.Moreover,the effect of steam velocity on the hydrodynamic behaviors of fluidization which on CO_(2)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 CO_(2)desorption rate in the wet fluidization desorption process.Furthermore,the effect of desorption temperature on CO_(2)desorption rate was evaluated for finding the appropriate temperature for CO_(2)desorption process of K2CO3/γ-Al_(2)O_(3).The results showed that the appropriate desorption temperature for CO_(2)desorption under steam atmosphere was the temperature over 150℃.

关键词： CO_(2)desorption Fluidized bed K_(2)CO_(3)/Y-Al_(2)O_(3) Restitution coefficient Wet fluidization Computational fluid dynamics

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