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

doi:10.1016/j.cjche.2020.12.025

Chinese Journal of Chemical Engineering ›› 2021, Vol. 40 ›› Issue (12): 179-186.DOI: 10.1016/j.cjche.2020.12.025

• Process Systems Engineering and Process Safety • Previous Articles Next Articles

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

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:2022-01-14 Published:2021-12-28
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).

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

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

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).

Abstract

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

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

Shupanxiang Chen, Guangying Chen, Xiaolan Zhao, Xiao Luo, Hongxia Gao, Wensheng Li, Zhiwu Liang. Feasibility analysis and process simulation of CO₂ dehydration using triethylene glycol for CO₂ pipeline transportation[J]. Chinese Journal of Chemical Engineering, 2021, 40(12): 179-186.

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

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

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