Beyond the standard two-film theory: Computational fluid dynamics simulations for carbon dioxide capture in a wetted wall column
Abstract
The standard two-film theory (STFT) is a diffusion-based mechanism that can be used to describe gas mass transfer across liquid film. Fundamental assumptions of the STFT impose serious limitations on its ability to predict mass transfer coefficients. To better understand gas absorption across liquid film in practical situations, a multiphase computational fluid dynamics (CFD) model fully equipped with mass transport and chemistry capabilities has been developed for solvent-based carbon dioxide (CO2) capture to predict the CO2 mass transfer coefficient in a wetted wall column. The hydrodynamics is modeled using a volume of fluid method, and the diffusive and reactive mass transfer between the two phases is modeled by adopting a one-fluid formulation. We demonstrate that the proposed CFD model can naturally account for the influence of many important factors on the overall mass transfer that cannot be quantitatively explained by the STFT, such as the local variation in fluid velocities and properties, flow instabilities, and complex geometries. The CFD model also can predict the local mass transfer coefficient variation along the column height, which the STFT typically does not consider.
- Authors:
-
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE; USDOE Office of Fossil Energy and Carbon Management (FECM)
- OSTI Identifier:
- 1430518
- Alternate Identifier(s):
- OSTI ID: 1461049; OSTI ID: 1548510
- Report Number(s):
- PNNL-SA-130465
Journal ID: ISSN 0009-2509; PII: S0009250918301519; TRN: US1802495
- Grant/Contract Number:
- AC05-76RL01830; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Chemical Engineering Science
- Additional Journal Information:
- Journal Volume: 184; Journal Issue: C; Journal ID: ISSN 0009-2509
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; Computational fluid dynamics; Standard two-film theory; Carbon capture; Physical and chemical absorption; OpenFOAM; Wetted wall column
Citation Formats
Wang, Chao, Xu, Zhijie, Lai, Canhai, and Sun, Xin. Beyond the standard two-film theory: Computational fluid dynamics simulations for carbon dioxide capture in a wetted wall column. United States: N. p., 2018.
Web. doi:10.1016/J.CES.2018.03.021.
Wang, Chao, Xu, Zhijie, Lai, Canhai, & Sun, Xin. Beyond the standard two-film theory: Computational fluid dynamics simulations for carbon dioxide capture in a wetted wall column. United States. https://doi.org/10.1016/J.CES.2018.03.021
Wang, Chao, Xu, Zhijie, Lai, Canhai, and Sun, Xin. Tue .
"Beyond the standard two-film theory: Computational fluid dynamics simulations for carbon dioxide capture in a wetted wall column". United States. https://doi.org/10.1016/J.CES.2018.03.021. https://www.osti.gov/servlets/purl/1430518.
@article{osti_1430518,
title = {Beyond the standard two-film theory: Computational fluid dynamics simulations for carbon dioxide capture in a wetted wall column},
author = {Wang, Chao and Xu, Zhijie and Lai, Canhai and Sun, Xin},
abstractNote = {The standard two-film theory (STFT) is a diffusion-based mechanism that can be used to describe gas mass transfer across liquid film. Fundamental assumptions of the STFT impose serious limitations on its ability to predict mass transfer coefficients. To better understand gas absorption across liquid film in practical situations, a multiphase computational fluid dynamics (CFD) model fully equipped with mass transport and chemistry capabilities has been developed for solvent-based carbon dioxide (CO2) capture to predict the CO2 mass transfer coefficient in a wetted wall column. The hydrodynamics is modeled using a volume of fluid method, and the diffusive and reactive mass transfer between the two phases is modeled by adopting a one-fluid formulation. We demonstrate that the proposed CFD model can naturally account for the influence of many important factors on the overall mass transfer that cannot be quantitatively explained by the STFT, such as the local variation in fluid velocities and properties, flow instabilities, and complex geometries. The CFD model also can predict the local mass transfer coefficient variation along the column height, which the STFT typically does not consider.},
doi = {10.1016/J.CES.2018.03.021},
journal = {Chemical Engineering Science},
number = C,
volume = 184,
place = {United States},
year = {Tue Mar 27 00:00:00 EDT 2018},
month = {Tue Mar 27 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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Works referencing / citing this record:
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