Numerical simulations and comparative analysis of two- and three-dimensional circulating fluidized bed reactors for CO2 capture

作     者：Yefeng Zhou Yifan Han Yujian Lu Hongcun Bai Xiayi Hu Xincheng Zhang Fanghua Xie Xiao Luo Jingdai Wang Yongrong Yang Yefeng Zhou;Yifan Han;Yujian Lu;Hongcun Bai;Xiayi Hu;Xincheng Zhang;Fanghua Xie;Xiao Luo;Jingdai Wang;Yongrong Yang

作者机构：National&Local United Engineering Research Centre for Chemical Process Simulation and IntensificationChemical Process Simulation and Optimization Engineering Research Center of Ministry of EducationXiangtan UniversityXiangtan 411105China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical EngineeringNingxia UniversityYinchuan 750021China College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China State Key Laboratory of Chemical EngineeringCollege of Chemical and Biological EngineeringDepartment of Chemical EngineeringZhejiang UniversityHangzhou 310027China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2020年第28卷第12期

页      面：2955-2967页

核心收录：

学科分类：0710[理学-生物学] 080706[工学-化工过程机械] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(21506181,21506179) Natural Science Foundation of Hunan Province(2020JJ3033,2019JJ40281,2018SK2027,2018RS3088,2019SK2112) Research Foundation of Education Bureau of Hunan Province(18B088) Hunan Key Laboratory of Environment Friendly Chemical Process Integration and Hunan 2011 Collaborative Innovation Center of Chemical Engineering&Technology with Environmental Benignity and Effective Resource Utilization,State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering(2020-KF-11). 

主　　题：Two-and three-dimensional simulations Circulating fluidized bed reactor Carbon dioxide adsorption Computational fluid dynamics Operating conditions 

摘      要：Carbon dioxide(CO2),the main gas emitted from fossil burning,is the primary contributor to global warming.Circulating fluidized bed reactor(CFBR)is proved as an energy-efficient method for post-combustion CO2 capture.The numerical simulation by computational fluid dynamics(CFD)is believed as a promising tool to study CO2 adsorption process in CFBR.Although three-dimensional(3D)simulations were proved to have better predicting performance with the experimental results,two-dimensional(2D)simulations have been widely reported for qualitative and quantitative studies on gas-solid behavior in CFBR for its higher computational efficiency recently.However,the discrepancies between 2D and 3D simulations have rarely been evaluated by detailed study.Considering that the differences between the 2D and 3D simulations will vary substantially with the changes of independent operating conditions,it is beneficial to lower computational costs to clarify the effects of dimensionality on the numerical CO2 adsorption runs under various operating conditions.In this work,the comparative analysis for CO2 adsorption in 2D and 3D simulations was conducted to enlighten the effects of dimensionality on the hydrodynamics and reaction behaviors,in which the separation rate,species distribution and hydrodynamic characteristics were comparatively studied for both model frames.With both accuracy and computational costs considered,the viable suggestions were provided in selecting appropriate model frame for the studies on optimization of operating conditions,which directly affect the capture and energy efficiencies of cyclic CO2 capture process in CFBR.