Using expansion units to improve CO<sub>2</sub> absorption for natural gas purification-A study on the hydrodynamics and mass transfer

Kai Zhu; Chaoqun Yao; Yanyan Liu; Guangwen Chen

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Using expansion units to improve CO₂ absorption for natural gas purification-A study on the hydrodynamics and mass transfer

Fluid Dynamics and Transport Phenomena | Updated：2026-01-06

- Using expansion units to improve CO₂ absorption for natural gas purification-A study on the hydrodynamics and mass transfer
- Using expansion units to improve CO₂ absorption for natural gas purification-A study on the hydrodynamics and mass transfer
- 中国化学工程学报（英文版） 2021年29卷第1期页码：35-46
- Affiliations：
  
  1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences,Dalian,China,116023
  2. University of Chinese Academy of Sciences,Beijing,China,100049
- Author bio：
- Funds：
- DOI：
  中图分类号：
- 纸质出版：2021
- Accepted：
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Kai Zhu, Chaoqun Yao, Yanyan Liu, 等. Using expansion units to improve CO₂ absorption for natural gas purification-A study on the hydrodynamics and mass transfer[J]. 中国化学工程学报（英文版）, 2021,29(1):35-46.

absorption for natural gas purification-A study on the hydrodynamics and mass transfer[J]. 中国化学工程学报, 2021, 29(1): 35-46.
Kai Zhu, Chaoqun Yao, Yanyan Liu, 等. Using expansion units to improve CO₂ absorption for natural gas purification-A study on the hydrodynamics and mass transfer[J]. 中国化学工程学报（英文版）, 2021,29(1):35-46. DOI：

absorption for natural gas purification-A study on the hydrodynamics and mass transfer[J]. 中国化学工程学报, 2021, 29(1): 35-46. DOI：

摘要

Abstract

The usage of capillary tubes for CO

absorption suffers from small residence time

which leads to reduced performance for large throughput. This work presents a method of connecting expansion units to capillary tubes to serve as a residence time delayer. The effect of the expansion unit on gas-liquid hydrodynamics

pressure drop and mass transfer coefficient (

) are investigated under various operating pressures up to 4.0 MPa

for both physical and chemical absorption. A novel periodic jetting flow is found in the expansion unit

which can intensify the CO

absorption. Experimental results show that the strategy can significantly decrease the pressure drop while maintaining the absorption performance to a large extent. The overall

for physical and chemical absorption are correlated to pressure drop

respectively. Besides

loading in rich absorbents increases dramatically compared to literature studies with only micromixers or capillary tubes

which is beneficial to regenerate solvent. The study verifies the concept that pre-treatment with water can largely

reduce the usage of amines

and can also provide a guide for process design in natural gas purification such as biogas recovery.

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Using expansion units to improve CO2 absorption for natural gas purification-A study on the hydrodynamics and mass transfer

Using expansion units to improve CO2 absorption for natural gas purification-A study on the hydrodynamics and mass transfer

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摘要

Abstract

关键词

Keywords

references

Using expansion units to improve CO₂ absorption for natural gas purification-A study on the hydrodynamics and mass transfer

Using expansion units to improve CO₂ absorption for natural gas purification-A study on the hydrodynamics and mass transfer