SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 29 ›› Issue (3): 56-66.DOI: 10.1016/j.cjche.2020.09.048

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A large-scale experimental study on CO2 capture utilizing slurry-based ab-adsorption approach

Shuren Yan, Peng Xiao, Ding Zhu, Hai Li, Guangjin Chen, Bei Liu   

  1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
  • Received:2020-06-27 Revised:2020-09-28 Online:2021-05-13 Published:2021-03-28
  • Contact: Bei Liu
  • Supported by:
    The authors gratefully acknowledge the financial supports received from the National Natural Science Foundation of China (21776301, 21636009) and the Science Foundation of China University of Petroleum, Beijing (2462018BJC004).

A large-scale experimental study on CO2 capture utilizing slurry-based ab-adsorption approach

Shuren Yan, Peng Xiao, Ding Zhu, Hai Li, Guangjin Chen, Bei Liu   

  1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
  • 通讯作者: Bei Liu
  • 基金资助:
    The authors gratefully acknowledge the financial supports received from the National Natural Science Foundation of China (21776301, 21636009) and the Science Foundation of China University of Petroleum, Beijing (2462018BJC004).

Abstract: The increasing concentration of CO2 in atmosphere is deemed the main reason of global warming. Therefore, efficiently capturing CO2 from various sources with energy conservation is of great significance. Herein, a series of experiments were carried out to successfully test the slurry-based ab-adsorption method for continuously capturing CO2 in the large-scale cycled separation unit with cost-effect taking into account the scale-up criteria. A bubble column (with height 4900 mm and inner diameter 376 mm) and a desorption tank (with volume 310 L) are the essential components of the separation unit. The novel slurry used in this study was formed with zeolitic imidazolate framework-8 and 2-methylimidazole-water solution. The influence of operation conditions was investigated systematically. The results show that increasing sorption pressure and slurry height level, decreasing gas volume flow and sorption temperature are beneficial for separation processes. The volume fraction of CO2 in the feed gas was also studied. Although the scale-up effect had been observed and it was found that it exerted a negative effect on CO2 capture, depending on experimental conditions, CO2 removal efficiency could still reach 85%-95% and the maximum CO2 loading in the recycled slurry could be up to 0.007 mol·L-1·kPa-1. Furthermore, the slurry-based method could be operated well even under very moderate regeneration conditions (333 K and 0.05 MPa), which means that the novel approach shows greater energy conservation than traditional amine absorption methods.

Key words: CO2 capture, Zeolitic imidazolate framework-8, Slurry, Bubble column, Scale-up

摘要: The increasing concentration of CO2 in atmosphere is deemed the main reason of global warming. Therefore, efficiently capturing CO2 from various sources with energy conservation is of great significance. Herein, a series of experiments were carried out to successfully test the slurry-based ab-adsorption method for continuously capturing CO2 in the large-scale cycled separation unit with cost-effect taking into account the scale-up criteria. A bubble column (with height 4900 mm and inner diameter 376 mm) and a desorption tank (with volume 310 L) are the essential components of the separation unit. The novel slurry used in this study was formed with zeolitic imidazolate framework-8 and 2-methylimidazole-water solution. The influence of operation conditions was investigated systematically. The results show that increasing sorption pressure and slurry height level, decreasing gas volume flow and sorption temperature are beneficial for separation processes. The volume fraction of CO2 in the feed gas was also studied. Although the scale-up effect had been observed and it was found that it exerted a negative effect on CO2 capture, depending on experimental conditions, CO2 removal efficiency could still reach 85%-95% and the maximum CO2 loading in the recycled slurry could be up to 0.007 mol·L-1·kPa-1. Furthermore, the slurry-based method could be operated well even under very moderate regeneration conditions (333 K and 0.05 MPa), which means that the novel approach shows greater energy conservation than traditional amine absorption methods.

关键词: CO2 capture, Zeolitic imidazolate framework-8, Slurry, Bubble column, Scale-up