SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 43 ›› Issue (3): 378-391.DOI: 10.1016/j.cjche.2021.02.022

Previous Articles    

Design and experiment of high-productivity two-stage vacuum pressure swing adsorption process for carbon capturing from dry flue gas

Xiuxin Yu, Bing Liu, Yuanhui Shen, Donghui Zhang   

  1. The Research Center of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2020-12-14 Revised:2021-02-15 Online:2022-04-28 Published:2022-03-28
  • Contact: Donghui Zhang,E-mail:donghuizhang@tju.edu.cn
  • Supported by:
    This research is financially supported by the Renewable Energy and Hydrogen Projects National key Research & Development Program of China (2019YFB1505000).

Design and experiment of high-productivity two-stage vacuum pressure swing adsorption process for carbon capturing from dry flue gas

Xiuxin Yu, Bing Liu, Yuanhui Shen, Donghui Zhang   

  1. The Research Center of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • 通讯作者: Donghui Zhang,E-mail:donghuizhang@tju.edu.cn
  • 基金资助:
    This research is financially supported by the Renewable Energy and Hydrogen Projects National key Research & Development Program of China (2019YFB1505000).

Abstract: A two-stage vacuum pressure swing adsorption (VPSA) process that coupled kinetically controlled and equilibrium controlled separation process with reflux has been investigated for capturing carbon dioxide from dry flue gas (85% N2/15% CO2). In the first enriching stage, carbon molecular sieve (CMS), which shows kinetic selectivity for CO2/N2, is adopted as the adsorbent to remove most N2 in feed gas, thereby upgrading CO2 and significantly reducing the amount for further refinement. The second stage loads zeolite 13X as adsorbent to purify the CO2-rich flow from the first stage for meeting the requirements of National Energy Technology Laboratory. Series of experiments have been conducted for adsorption isotherms measuring and lab-scale experimental validation as well as analysis. The effect of feed composition on the separation performance of the PSA system was studied experimentally and theoretically here. The optimal results achieved 95.1% purity and 92.9% recovery with a high CO2 productivity (1.89 mol CO2·h-1·kg-1) and an appropriate energy consumption of 1.07 MJ·(kg CO2)-1. Further analysis has been carried out by simulation for explicating the temperature, pressure, and concentration distribution at cyclic steady state.

Key words: Two-stage VPSA process, Binary mixture, CO2 capture, Zeolite 13X, Carbon molecular sieve

摘要: A two-stage vacuum pressure swing adsorption (VPSA) process that coupled kinetically controlled and equilibrium controlled separation process with reflux has been investigated for capturing carbon dioxide from dry flue gas (85% N2/15% CO2). In the first enriching stage, carbon molecular sieve (CMS), which shows kinetic selectivity for CO2/N2, is adopted as the adsorbent to remove most N2 in feed gas, thereby upgrading CO2 and significantly reducing the amount for further refinement. The second stage loads zeolite 13X as adsorbent to purify the CO2-rich flow from the first stage for meeting the requirements of National Energy Technology Laboratory. Series of experiments have been conducted for adsorption isotherms measuring and lab-scale experimental validation as well as analysis. The effect of feed composition on the separation performance of the PSA system was studied experimentally and theoretically here. The optimal results achieved 95.1% purity and 92.9% recovery with a high CO2 productivity (1.89 mol CO2·h-1·kg-1) and an appropriate energy consumption of 1.07 MJ·(kg CO2)-1. Further analysis has been carried out by simulation for explicating the temperature, pressure, and concentration distribution at cyclic steady state.

关键词: Two-stage VPSA process, Binary mixture, CO2 capture, Zeolite 13X, Carbon molecular sieve