SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (12): 2955-2967.DOI: 10.1016/j.cjche.2020.07.003

• Fluid Dynamics and Transport Phenomena •     Next Articles

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

Yefeng Zhou1, Yifan Han1, Yujian Lu1, Hongcun Bai2, Xiayi Hu1, Xincheng Zhang1, Fanghua Xie1, Xiao Luo3, Jingdai Wang4, Yongrong Yang4   

  1. 1 National & Local United Engineering Research Centre for Chemical Process Simulation and Intensification, Chemical Process Simulation and Optimization Engineering Research Center of Ministry of Education, Xiangtan University, Xiangtan 411105, China;
    2 State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;
    3 College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;
    4 State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2020-04-15 Revised:2020-06-23 Online:2021-01-11 Published:2020-12-28
  • Contact: Yefeng Zhou, Xiayi Hu
  • Supported by:
    The work was 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).

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

Yefeng Zhou1, Yifan Han1, Yujian Lu1, Hongcun Bai2, Xiayi Hu1, Xincheng Zhang1, Fanghua Xie1, Xiao Luo3, Jingdai Wang4, Yongrong Yang4   

  1. 1 National & Local United Engineering Research Centre for Chemical Process Simulation and Intensification, Chemical Process Simulation and Optimization Engineering Research Center of Ministry of Education, Xiangtan University, Xiangtan 411105, China;
    2 State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;
    3 College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;
    4 State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China
  • 通讯作者: Yefeng Zhou, Xiayi Hu
  • 基金资助:
    The work was 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).

Abstract: 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.

Key words: 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.

关键词: Two- and three-dimensional simulations, Circulating fluidized bed reactor, Carbon dioxide adsorption, Computational fluid dynamics, Operating conditions