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

作　　者：Yadong Li Yuanhui Shen Zhaoyang Niu Junpeng Tian Donghui Zhang Zhongli Tang Wenbin Li 

机构地区：[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

出　　处：《Chinese Journal of Chemical Engineering》2023年第1期346-360,共15页中国化学工程学报（英文版）

基　　金：Projects in National Key Research and Development Plan of China(2019YFB1505002).

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 

分 类 号：TQ424.1[化学工程] X701[环境科学与工程—环境工程]