Analysis of carbon dioxide absorption in and stripping from aqueous monoethanolamine

Meldon, Jerry H.; Morales-Cabrera, Miguel A.

doi:10.1016/j.cej.2011.05.099

Cited by 29 publications

(8 citation statements)

References 28 publications

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“…Table 4 includes the values of liquid film thickness found in this work and their associated enhancement factors. The results show the same tendency reported by Meldon and Morales-Cabrera (2011). It can be also observed in Table 4 that when the MEA concentration passes from 30 wt.% to 40 wt.% the enhancement factor is increased from approximately 77 to 91, which means a 15% increase.…”

Section: Hydrodynamics Of the Aqueous Mea Solutionsupporting

confidence: 90%

Micro-scale CFD modeling of reactive mass transfer in falling liquid films within structured packing materials

Sebastia‐Saez

Ranganathan

et al. 2015

International Journal of Greenhouse Gas Control

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Post-combustion carbon capture in structured packing columns is considered as a promising technology to reduce greenhouse gas (GHG) emissions because of its maturity and the possibility of being retrofitted to existing power plants. CFD plays an important role in the optimization of this technology. However, due to the current computational capacity limitations, the simulations need to be divided into three scales (i.e. micro-, meso- and macro-scale) depending on the flow characteristics to be analyzed. This study presents a 3D micro-scale approach to describe the hydrodynamics and reactive mass transfer of the CO2-MEA chemical system within structured packing materials. Higbie's penetration theory is used to describe the mass transfer characteristics whereas enhancement factors are implemented to represent the gain in the absorption rate attributable to the chemical reaction. The results show a detrimental effect of the liquid load on the absorption rate via a decrease in the enhancement factor. The evolution of the wetted area for MEA solutions is compared to the case of pure water highlighting the differences in the transient behavior. The CO2 concentration profiles are examined showing the capability of the model to reproduce the depletion of the solute within the bulk liquid ascribed to the high value of the Hatta number. Also, several approaches on the reaction mechanism such as reversibility and instantaneous behavior are assessed. The results from micro-scale are to be used in meso-scale analysis in future studies to optimize the reactive absorption characteristics of structured packing materials

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Section: Hydrodynamics Of the Aqueous Mea Solutionsupporting

confidence: 90%

Micro-scale CFD modeling of reactive mass transfer in falling liquid films within structured packing materials

Sebastia‐Saez

Ranganathan

et al. 2015

International Journal of Greenhouse Gas Control

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“…Hence it is safe to say that, using this approach a better estimate of physical mass transfer can be obtained than theoretical models. Since the MEA mass fraction is an important parameter influencing the chemical absorption rate [43] the current approach is suggested for estimating the enhancement factor and studies involving the design of CO 2 reactors.…”

Section: Comparing the Influence Of Mea Concentrationmentioning

confidence: 99%

Investigating the Advantages and Limitations of Modeling Physical Mass Transfer of CO2 on Flat Plate by One Fluid Formulation in OpenFOAM

Thummala

Ün²,

Çelik

2019

Period. Polytech. Chem. Eng.

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One fluid formulation is an approach used for modeling and analysis of mass transfer between two immiscible phases. In this study we implement and analyze the advantages and limitations of this approach for CO2 physical mass transfer into MEA. The domain is a flat plate and gas liquid flow is counter current. The analysis was carried for operating parameters like liquid phase Reynolds number, MEA mass fraction and the angle of inclination of flat plate. The results clearly show that the model effectively captures the deviation in liquid side mass transfer coefficient due to the surface instabilities and liquid properties which are generally neglected by standard correlations. Also the model shows that the standard Higbie correlation is preferable at low Reynolds number at any angle of inclination. The grid independent studies show that a size of 6.25 µm is required in the interface region for effectively using this approach. The computational resource time at this resolution was found as the only limitation for using this approach and we suggest a procedure to overcome this limitation. The present simulation results can help CFD researchers investigating immiscible gas-liquid mass transfer using OpenFOAM.

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“…Some authors have proposed a purely equilibrium reaction set [20,27,32,40,52], while others have considered only one kinetic reaction between CO2 and MEA [11,[54][55][56], or multiple kinetic reactions involving CO2 and MEA and CO2 and OHions [15,35]. However, the most used approach is to consider a hybrid set that takes into account both equilibrium and kinetic reactions [7,12,16,39,41,42,49,50,[57][58][59].…”

Section: Chemical Reactionsmentioning

confidence: 99%

Process analysis for the carbon dioxide chemical absorption–regeneration system

2018

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The process analysis for the post-combustion CO2 capture using amine-based solvents is nowadays a fundamental step in its industrial scale design. In this work, the absorption-solvent regeneration system is deeply analyzed for different values of the loading in the solvent entering the absorber. The importance of the temperature and composition column profiles is highlighted for both the columns. In particular, the tight connection between the profiles and the L/G ratio is found to influence the choice of solvent flow rate for what concerns the absorber. On the other hand, an alternative configuration for the stripper is proposed together with a new criterion for the evaluation of the packing height. Finally, it is found that, in order to minimize the energy consumption in the stripper, the rich solvent must be sent at the highest possible temperature, taking into account the limitations imposed by the minimum temperature approach in the cross heat-exchanger and the solvent degradation.

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Analysis of carbon dioxide absorption in and stripping from aqueous monoethanolamine

Cited by 29 publications

References 28 publications

Micro-scale CFD modeling of reactive mass transfer in falling liquid films within structured packing materials

Micro-scale CFD modeling of reactive mass transfer in falling liquid films within structured packing materials

Investigating the Advantages and Limitations of Modeling Physical Mass Transfer of CO2 on Flat Plate by One Fluid Formulation in OpenFOAM

Process analysis for the carbon dioxide chemical absorption–regeneration system

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