Numerical and Experimental Study on Liquid Film Flows on Packing Elements in Absorbers for Post-combustion CO2 Capture

Iso, Yoshiyuki; Huang, Jian; Kato, Mariko; Matsuno, Shinsuke; Takano, Kenji

doi:10.1016/j.egypro.2013.05.178

Cited by 31 publications

(21 citation statements)

References 18 publications

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“…The wetted area as a function of the Reynolds number for the case of pure water was compared to the experimental results presented by Hoffmann et al (2005) and Iso et al (2013), showing a satisfactory agreement. Three different liquid film shapes depending on the value of the liquid injection velocity (i.e.…”

Section: Hydrodynamics Of the Aqueous Mea Solutionmentioning

confidence: 73%

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 Solutionmentioning

confidence: 73%

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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“…In recent years, the VOF CFD approach has been used more and more to investigate wetting, the effective area and liquid hold-up in structured packing (Ataki and Bart, 2006;Hoffmann et al, 2006;Shojaee et al, 2011;Haroun et al, 2014;Sebastia-Saez et al, 2013;Iso et al, 2013;Iso and Chen, 2011). Indeed, this method is adapted to simulate wetting phenomena since it is possible to specify a wall adhesion angle in conjunction with the surface tension model (Raynal et al, 2009).…”

Section: Effective Area and Liquid Hold-upmentioning

confidence: 99%

Use of Computational Fluid Dynamics for Absorption Packed Column Design

Haroun

Raynal

2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-Computational Fluid Dynamics (CFD) is today commonly used in a wide variety of process industries and disciplines for the development of innovative technologies. The present article aims to show how CFD can be used as an effective analysis and design tool for the development and design of packed gas/liquid absorption columns. It is first shown how CFD can be used for the characterisation of packings. The different hydrodynamic and mass transfer design parameters are investigated and adapted CFD methods are suggested. Secondly, column distribution internal development is discussed to show how CFD simulations should be performed to improve the design of gas and liquid distributors. An example of the development of new distribution technologies for floating installation of a reactive absorption column is also presented.Résumé -Utilisation de la dynamique des fluides numérique pour le design des colonnes d'absorption à garnissages -La dynamique des fluides numérique (Computational Fluid Dynamics, CFD) est aujourd'hui couramment utilisée pour le développement de technologies innovantes dans de nombreux domaines et procédés industriels. Cet article a pour objectif de montrer comment la CFD peut être utilisée comme outil d'analyse et de dimensionnement pour le développement des colonnes d'absorption gaz-liquide à garnissages. En premier, il est présenté comment la CFD peut être utilisée pour caractériser les différents paramètres de dimensionnement d'un garnissage (hydrodynamique et transfert). Les méthodes CFD appropriées sont suggérées et discutées. En second, l'utilisation de la CFD pour le développement et l'optimisation des internes de distribution gaz-liquide est exposée. Un exemple de développement par CFD d'une nouvelle technologie de distribution pour une colonne d'absorption réactive sur une installation flottante offshore est présenté.

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“…Considering the low viscosity and high surface tension of the working liquid used in the current investigation, Re = 150 was chosen to form a stable film when the fluid flows through the open‐window region. As discussed by Iso et al, the flow can still be considered laminar.…”

Section: Mathematical Modellingmentioning

confidence: 99%

Numerical investigation on hydrodynamics of vertically confined free film

Yang

et al. 2016

Can J Chem Eng

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For intensification of the film transfer process, flow behaviours of a novel type of liquid film, “confined free film” (a coexistence of both wall‐bounded and unbounded films), on a vertically‐aligned plate with an open window were investigated using the CFD modelling approach. It was found from the simulations that the liquid flow profiles of confined free film in the region of the open window vary with flow time. The average film thickness of the confined free film in the open window region is approximately 0.50∼0.67 of that in the solid wall region, while the corresponding velocity is approximately 1.7∼2.0 times faster. The falling film reaches its maximum thickness value and maximum velocity magnitude at the lower part of the open‐window region in the current study. Simulation results also indicated that the region of the lower‐wall plate promotes both varicose and sinuous wavy behaviour of the confined free film, while the open‐window region assists in exciting film wave motion in the lower‐wall region. Compared with vertically falling free film, the confined free film exhibits several distinctive features in its flow behaviour.

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Numerical and Experimental Study on Liquid Film Flows on Packing Elements in Absorbers for Post-combustion CO2 Capture

Cited by 31 publications

References 18 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

Use of Computational Fluid Dynamics for Absorption Packed Column Design

Numerical investigation on hydrodynamics of vertically confined free film

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