SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 40 ›› Issue (12): 179-186.DOI: 10.1016/j.cjche.2020.12.025

• Process Systems Engineering and Process Safety • 上一篇    下一篇

Feasibility analysis and process simulation of CO2 dehydration using triethylene glycol for CO2 pipeline transportation

Shupanxiang Chen, Guangying Chen, Xiaolan Zhao, Xiao Luo, Hongxia Gao, Wensheng Li, Zhiwu Liang   

  1. Joint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, Department of Chemical Engineering, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
  • 收稿日期:2020-10-14 修回日期:2020-11-25 出版日期:2021-12-28 发布日期:2022-01-14
  • 通讯作者: Xiao Luo,E-mail:x_luo@hnu.edu.cn;Zhiwu Liang,E-mail:zwliang@hnu.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (21536003, 21776065 and 21978075) and the Natural Science Foundation of Hunan Province in China (2019JJ20006).

Feasibility analysis and process simulation of CO2 dehydration using triethylene glycol for CO2 pipeline transportation

Shupanxiang Chen, Guangying Chen, Xiaolan Zhao, Xiao Luo, Hongxia Gao, Wensheng Li, Zhiwu Liang   

  1. Joint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, Department of Chemical Engineering, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
  • Received:2020-10-14 Revised:2020-11-25 Online:2021-12-28 Published:2022-01-14
  • Contact: Xiao Luo,E-mail:x_luo@hnu.edu.cn;Zhiwu Liang,E-mail:zwliang@hnu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21536003, 21776065 and 21978075) and the Natural Science Foundation of Hunan Province in China (2019JJ20006).

摘要: The operation of dehydration is very important in the process of gas transportation. This study aims to evaluate the application feasibility of CO2 dehydration using triethylene glycol, which is also called TEG for short. Aspen Plus software was used to simulate the dehydration process system of CO2 gas transportation using TEG dehydration. Parameter analysis and process improvement were carried out for the simulation of dehydration process. At first, a sensitivity analysis was conducted to analyze and optimize operating conditions of conventional CO2-TEG dehydration process system. Subsequently, a recycle unit was introduced into the conventional CO2-TEG dehydration process system, it can be found that the improved process system with the recycle unit has a higher CO2 recovery rate which was about 9.8% than the conventional one. Moreover, the improved process system showed excellent operation stability through the comparison of simulation results of several processes with various water contents in their feed gases. Although the energy consumption is increased by about 2%, the improved process was economically and technically feasible for the long-term availability of CO2 pipeline transportation. The simulated results showed that the improved CO2-TEG process system has promising application prospects in CO2 dehydration of CO2 gas transportation with high stability.

关键词: Carbon dioxide, Dehydration, Simulation, Triethylene glycol, Process system

Abstract: The operation of dehydration is very important in the process of gas transportation. This study aims to evaluate the application feasibility of CO2 dehydration using triethylene glycol, which is also called TEG for short. Aspen Plus software was used to simulate the dehydration process system of CO2 gas transportation using TEG dehydration. Parameter analysis and process improvement were carried out for the simulation of dehydration process. At first, a sensitivity analysis was conducted to analyze and optimize operating conditions of conventional CO2-TEG dehydration process system. Subsequently, a recycle unit was introduced into the conventional CO2-TEG dehydration process system, it can be found that the improved process system with the recycle unit has a higher CO2 recovery rate which was about 9.8% than the conventional one. Moreover, the improved process system showed excellent operation stability through the comparison of simulation results of several processes with various water contents in their feed gases. Although the energy consumption is increased by about 2%, the improved process was economically and technically feasible for the long-term availability of CO2 pipeline transportation. The simulated results showed that the improved CO2-TEG process system has promising application prospects in CO2 dehydration of CO2 gas transportation with high stability.

Key words: Carbon dioxide, Dehydration, Simulation, Triethylene glycol, Process system