SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2023, Vol. 53 ›› Issue (1): 346-360.DOI: 10.1016/j.cjche.2022.01.029

Previous Articles     Next Articles

Process analysis of temperature swing adsorption and temperature vacuum swing adsorption in VOCs recovery from activated carbon

Yadong Li, Yuanhui Shen, Zhaoyang Niu, Junpeng Tian, Donghui Zhang, Zhongli Tang, Wenbin Li   

  1. Collaborative Innovation Center of Chemical Science and Engineering, The Research Center of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2021-09-05 Revised:2022-01-15 Online:2023-04-08 Published:2023-01-28
  • Contact: Donghui Zhang,E-mail:donghuizhang@tju.edu.cn
  • Supported by:
    The Renewable Energy and Hydrogen Projects in National Key Research and Development Plan of China (2019YFB1505002).

Process analysis of temperature swing adsorption and temperature vacuum swing adsorption in VOCs recovery from activated carbon

Yadong Li, Yuanhui Shen, Zhaoyang Niu, Junpeng Tian, Donghui Zhang, Zhongli Tang, Wenbin Li   

  1. Collaborative Innovation Center of Chemical Science and Engineering, 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:
    The Renewable Energy and Hydrogen Projects in National Key Research and Development Plan of China (2019YFB1505002).

Abstract: In order to better guide the design of industrial process for purification and recovery of VOCs, temperature swing adsorption (TSA) and temperature vacuum swing adsorption (TVSA) process for VOCs purification and recovery were studied systematically with activated carbon adsorbent. The adsorption and desorption behaviors of benzene on activated carbon in above two processes were investigated systematically. Effects of operating parameters on process performances were further analyzed, including as regeneration temperature, purging feed ratio and hot–cold purging ratio. The results showed that the increase of hot–cold purging ratio (HP/CP) could obtain the same regeneration effect as the increase of desorption temperature. Increasing the feed purge ratio without increasing the hot–cold purging ratio is not conducive to bed regeneration, because a large number of cold purge gases cannot utilize the residual heat of temperature wave, thus reducing the desorption effect of the cooling step on the bed. In addition, the vacuum step can enhance the regeneration ability of hot nitrogen to the bed at the same regeneration temperature, making the bed regeneration of TVSA process more thorough. Temperature in the middle and lower part of the bed in TVSA process was higher and the regeneration was more thorough. In conclusion, TVSA has more obvious advantages than TSA in terms of energy consumption, hot or cold purge volume and bed regeneration.

Key words: VOCs, TSA, TVSA, Activated carbon, Benzene

摘要: In order to better guide the design of industrial process for purification and recovery of VOCs, temperature swing adsorption (TSA) and temperature vacuum swing adsorption (TVSA) process for VOCs purification and recovery were studied systematically with activated carbon adsorbent. The adsorption and desorption behaviors of benzene on activated carbon in above two processes were investigated systematically. Effects of operating parameters on process performances were further analyzed, including as regeneration temperature, purging feed ratio and hot–cold purging ratio. The results showed that the increase of hot–cold purging ratio (HP/CP) could obtain the same regeneration effect as the increase of desorption temperature. Increasing the feed purge ratio without increasing the hot–cold purging ratio is not conducive to bed regeneration, because a large number of cold purge gases cannot utilize the residual heat of temperature wave, thus reducing the desorption effect of the cooling step on the bed. In addition, the vacuum step can enhance the regeneration ability of hot nitrogen to the bed at the same regeneration temperature, making the bed regeneration of TVSA process more thorough. Temperature in the middle and lower part of the bed in TVSA process was higher and the regeneration was more thorough. In conclusion, TVSA has more obvious advantages than TSA in terms of energy consumption, hot or cold purge volume and bed regeneration.

关键词: VOCs, TSA, TVSA, Activated carbon, Benzene