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

doi:10.1016/j.cjche.2020.07.003

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (12): 2955-2967.DOI: 10.1016/j.cjche.2020.07.003

• Fluid Dynamics and Transport Phenomena • 下一篇

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 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

收稿日期:2020-04-15 修回日期:2020-06-23 出版日期:2020-12-28 发布日期:2021-01-11
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).

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 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:2020-12-28 Published:2021-01-11
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).

摘要/Abstract

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

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

Yefeng Zhou, Yifan Han, Yujian Lu, Hongcun Bai, Xiayi Hu, Xincheng Zhang, Fanghua Xie, Xiao Luo, Jingdai Wang, Yongrong Yang. Numerical simulations and comparative analysis of two- and three-dimensional circulating fluidized bed reactors for CO₂ capture[J]. 中国化学工程学报, 2020, 28(12): 2955-2967.

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

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

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