The Experts below are selected from a list of 3591 Experts worldwide ranked by ideXlab platform
K Papadikis - One of the best experts on this subject based on the ideXlab platform.
-
meso scale cfd study of the pressure drop liquid hold up interfacial area and mass transfer in Structured Packing materials
International Journal of Greenhouse Gas Control, 2015Co-Authors: Daniel Sebastiasaez, Sai Gu, Panneerselvam Ranganathan, K PapadikisAbstract:Abstract This work presents a meso-scale CFD methodology to describe the multiphase flow inside commercial Structured Packings for post-combustion CO 2 capture. Meso-scale simulations of Structured Packings are often limited in the literature to dry pressure drop analyses whereas mass transfer characteristics and gas–liquid interface tracking are usually investigated at micro-scale. This work aims at testing further capabilities of meso-scale modeling by implementing the interface tracking instead of analyzing only the dry pressure drop performance with single-phase simulations. By doing so, it is possible to present also the hydrodynamics (i.e. liquid hold-up and interfacial area) for a small set of representative elementary units (REUs). The interest in interface tracking using commercial geometries lies on the fact that liquid hold-up and interfacial area have implications of capital importance on the overall performance of the absorber, hence the importance of developing a model to predict them accurately. The results show how the relationship, reported in the literature, between the liquid load and both the liquid hold-up and the interfacial area is reproduced by the present CFD methodology. Also, a more realistic visualization is accomplished with images of the inner irregularities of the flow (i.e. liquid maldistribution, formation of droplets and rivulets, etc.), which lie far from the prevailing assumption of the formation of a perfectly developed liquid film over the Packing. Moreover, the effect of operating parameters such as the liquid load, liquid viscosity and liquid–solid contact angle on the amount of interfacial area available for mass transfer is also discussed. Finally, mass source terms are also included to describe the gas absorption into the liquid phase hence testing all the capabilities of micro-scale modeling at meso-scale. The present model could be further used for the analysis and optimization of other Structured Packing geometries.
-
micro scale cfd modeling of reactive mass transfer in falling liquid films within Structured Packing materials
International Journal of Greenhouse Gas Control, 2015Co-Authors: Daniel Sebastiasaez, Sai Gu, Panneerselvam Ranganathan, K PapadikisAbstract: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.
-
3d modeling of hydrodynamics and physical mass transfer characteristics of liquid film flows in Structured Packing elements
International Journal of Greenhouse Gas Control, 2013Co-Authors: Daniel Sebastiasaez, Sai Gu, Panneerselvam Ranganathan, K PapadikisAbstract:Post-combustion CO2 capture by chemical absorption in Structured packed columns has been technically and commercially proven as a viable option to be deployed for carbon emissions mitigation. In this work, a three dimensional CFD model at small scale for hydrodynamics and physical mass transfer in Structured Packing elements is developed. The results from the present model are validated with theory and reported experimental data. For hydrodynamics, the liquid film thickness and wetted area are calculated whereas for mass transfer, the Sherwood number and concentrations of dissolved species are predicted. The CFD results match reasonably with experimental and theoretical data. Furthermore, the influence of texture patterns and the liquid phase viscosity on the wetted area is studied. It is found that both parameters have a strong influence on the results. For physical mass transfer, the study of the transient behavior and the impact of the liquid load on the absorption rate is assessed. It is observed that lower liquid loads maximize mass transfer coefficients but also enhance liquid misdistribution (i.e. with the possibility of hindering mass transfer). An optimum liquid load is found where the effect of liquid misdistribution can be avoided, maximizing gas absorption.
Z Olujic - One of the best experts on this subject based on the ideXlab platform.
-
Liquid distribution images on Structured Packing by X‐ray computed tomography
Aiche Journal, 2020Co-Authors: Pierre Marchot, Dominique Toye, A M Pelsser, Michel Crine, Guy L'homme, Z OlujicAbstract:The purpose of this article is to present results obtained with the Structured Packing installed in a column with an internal diameter of 0.6 m, using an air/water system at ambient conditions. In this article, we are mainly concerned with the geometric aspect of the problem.
-
Structured Packing efficiency vital information for the chemical industry
Chemical Engineering Research & Design, 2011Co-Authors: Markus Ottenbacher, Z Olujic, Till Adrian, Michael Jodecke, Christoph GrosmannAbstract:Abstract Distillation is the most important thermal separation process, with separation efficiency as one of the fundamental parameters to influence economy and energy consumption. The precise knowledge of separation efficiency and the ability to compare different types of column internals is vital information for the chemical industry. Still, total reflux distillation experiments are the only significant source of such data. The authors have taken the effort to work out in elaborate manner different factors influencing both measurement and interpretation of Structured Packing separation efficiency data, to provide basis for establishing an open standard in this respect. In addition, an improved set of thermophysical correlations for the test system chlorobenzene/ethylbenzene (CB/EB) is presented.
-
experimental characterization and modeling of the performance of a large specific area high capacity Structured Packing
Industrial & Engineering Chemistry Research, 2007Co-Authors: Z Olujic, M Behrens, L SpiegelAbstract:This paper presents the results of a comprehensive experimental study performed with a Sulzer high-capacity Structured Packing of a larger specific area, which provided a basis for validation of the Delft model. Purely geometry-based adaptations were made to the Delft model, to account properly for the effect of short smooth bends on both ends of each corrugated sheet, which, in turn, seemed to be beneficial for capacity without adversely affecting the efficiency. Comparisons indicate fairly good agreement with experiments as well as with the predictions of an in-house empirical model contained in Sulzer's software package, Sulpak.
-
hydrodynamic analogy based model for efficiency of Structured Packing columns
Aiche Journal, 2006Co-Authors: A Shilkin, Eugeny Y Kenig, Z OlujicAbstract:A model based on the hydrodynamic analogy approach was developed for the prediction of temperature and composition profiles in Structured Packing distillation columns. Compared to the traditional models based on the film theory, the proposed model is more rigorous. It comprises Navier-Stokes equations, convection-diffusion and heat-conduction equations to describe the transport phenomena under condition of two-phase gas-liquid flow in an entire separation column. As a result, modeling the column efficiency is accomplished without application of the mass-transfer coefficients. For the model verification, total reflux distillation data for binary and multicomponent mixtures are used. Calculations with both the hydrodynamic-analogy-based, and the film model are performed for a wide range of operating conditions. The proposed model is shown to have a more stable performance than the traditional one. Therefore, it can be recommended for design, revamp and optimization of distillation columns equipped with corrugated sheet Structured Packings. © 2006 American Institute of Chemical Engineers AIChE J, 2006
-
performance characteristics of a new high capacity Structured Packing
Chemical Engineering and Processing, 2003Co-Authors: Z Olujic, Albert F Seibert, B Kaibel, Helmut Jansen, Thomas Rietfort, Egon ZichAbstract:Total reflux distillation results of a comprehensive experimental study are reported for a new generation of Montz high capacity Structured Packings. The major feature of the Montz B1-M® series is a smooth bend in the bottom third of the corrugation with continuously increasing corrugation base width. A comparison is made with the performance of conventional Structured Packing under the same test conditions. The relationships between specific surface area, pressure drop, capacity, and separation efficiency are discussed.
Sai Gu - One of the best experts on this subject based on the ideXlab platform.
-
meso scale cfd study of the pressure drop liquid hold up interfacial area and mass transfer in Structured Packing materials
International Journal of Greenhouse Gas Control, 2015Co-Authors: Daniel Sebastiasaez, Sai Gu, Panneerselvam Ranganathan, K PapadikisAbstract:Abstract This work presents a meso-scale CFD methodology to describe the multiphase flow inside commercial Structured Packings for post-combustion CO 2 capture. Meso-scale simulations of Structured Packings are often limited in the literature to dry pressure drop analyses whereas mass transfer characteristics and gas–liquid interface tracking are usually investigated at micro-scale. This work aims at testing further capabilities of meso-scale modeling by implementing the interface tracking instead of analyzing only the dry pressure drop performance with single-phase simulations. By doing so, it is possible to present also the hydrodynamics (i.e. liquid hold-up and interfacial area) for a small set of representative elementary units (REUs). The interest in interface tracking using commercial geometries lies on the fact that liquid hold-up and interfacial area have implications of capital importance on the overall performance of the absorber, hence the importance of developing a model to predict them accurately. The results show how the relationship, reported in the literature, between the liquid load and both the liquid hold-up and the interfacial area is reproduced by the present CFD methodology. Also, a more realistic visualization is accomplished with images of the inner irregularities of the flow (i.e. liquid maldistribution, formation of droplets and rivulets, etc.), which lie far from the prevailing assumption of the formation of a perfectly developed liquid film over the Packing. Moreover, the effect of operating parameters such as the liquid load, liquid viscosity and liquid–solid contact angle on the amount of interfacial area available for mass transfer is also discussed. Finally, mass source terms are also included to describe the gas absorption into the liquid phase hence testing all the capabilities of micro-scale modeling at meso-scale. The present model could be further used for the analysis and optimization of other Structured Packing geometries.
-
micro scale cfd modeling of reactive mass transfer in falling liquid films within Structured Packing materials
International Journal of Greenhouse Gas Control, 2015Co-Authors: Daniel Sebastiasaez, Sai Gu, Panneerselvam Ranganathan, K PapadikisAbstract: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.
-
3d modeling of hydrodynamics and physical mass transfer characteristics of liquid film flows in Structured Packing elements
International Journal of Greenhouse Gas Control, 2013Co-Authors: Daniel Sebastiasaez, Sai Gu, Panneerselvam Ranganathan, K PapadikisAbstract:Post-combustion CO2 capture by chemical absorption in Structured packed columns has been technically and commercially proven as a viable option to be deployed for carbon emissions mitigation. In this work, a three dimensional CFD model at small scale for hydrodynamics and physical mass transfer in Structured Packing elements is developed. The results from the present model are validated with theory and reported experimental data. For hydrodynamics, the liquid film thickness and wetted area are calculated whereas for mass transfer, the Sherwood number and concentrations of dissolved species are predicted. The CFD results match reasonably with experimental and theoretical data. Furthermore, the influence of texture patterns and the liquid phase viscosity on the wetted area is studied. It is found that both parameters have a strong influence on the results. For physical mass transfer, the study of the transient behavior and the impact of the liquid load on the absorption rate is assessed. It is observed that lower liquid loads maximize mass transfer coefficients but also enhance liquid misdistribution (i.e. with the possibility of hindering mass transfer). An optimum liquid load is found where the effect of liquid misdistribution can be avoided, maximizing gas absorption.
Daniel Sebastiasaez - One of the best experts on this subject based on the ideXlab platform.
-
meso scale cfd study of the pressure drop liquid hold up interfacial area and mass transfer in Structured Packing materials
International Journal of Greenhouse Gas Control, 2015Co-Authors: Daniel Sebastiasaez, Sai Gu, Panneerselvam Ranganathan, K PapadikisAbstract:Abstract This work presents a meso-scale CFD methodology to describe the multiphase flow inside commercial Structured Packings for post-combustion CO 2 capture. Meso-scale simulations of Structured Packings are often limited in the literature to dry pressure drop analyses whereas mass transfer characteristics and gas–liquid interface tracking are usually investigated at micro-scale. This work aims at testing further capabilities of meso-scale modeling by implementing the interface tracking instead of analyzing only the dry pressure drop performance with single-phase simulations. By doing so, it is possible to present also the hydrodynamics (i.e. liquid hold-up and interfacial area) for a small set of representative elementary units (REUs). The interest in interface tracking using commercial geometries lies on the fact that liquid hold-up and interfacial area have implications of capital importance on the overall performance of the absorber, hence the importance of developing a model to predict them accurately. The results show how the relationship, reported in the literature, between the liquid load and both the liquid hold-up and the interfacial area is reproduced by the present CFD methodology. Also, a more realistic visualization is accomplished with images of the inner irregularities of the flow (i.e. liquid maldistribution, formation of droplets and rivulets, etc.), which lie far from the prevailing assumption of the formation of a perfectly developed liquid film over the Packing. Moreover, the effect of operating parameters such as the liquid load, liquid viscosity and liquid–solid contact angle on the amount of interfacial area available for mass transfer is also discussed. Finally, mass source terms are also included to describe the gas absorption into the liquid phase hence testing all the capabilities of micro-scale modeling at meso-scale. The present model could be further used for the analysis and optimization of other Structured Packing geometries.
-
micro scale cfd modeling of reactive mass transfer in falling liquid films within Structured Packing materials
International Journal of Greenhouse Gas Control, 2015Co-Authors: Daniel Sebastiasaez, Sai Gu, Panneerselvam Ranganathan, K PapadikisAbstract: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.
-
3d modeling of hydrodynamics and physical mass transfer characteristics of liquid film flows in Structured Packing elements
International Journal of Greenhouse Gas Control, 2013Co-Authors: Daniel Sebastiasaez, Sai Gu, Panneerselvam Ranganathan, K PapadikisAbstract:Post-combustion CO2 capture by chemical absorption in Structured packed columns has been technically and commercially proven as a viable option to be deployed for carbon emissions mitigation. In this work, a three dimensional CFD model at small scale for hydrodynamics and physical mass transfer in Structured Packing elements is developed. The results from the present model are validated with theory and reported experimental data. For hydrodynamics, the liquid film thickness and wetted area are calculated whereas for mass transfer, the Sherwood number and concentrations of dissolved species are predicted. The CFD results match reasonably with experimental and theoretical data. Furthermore, the influence of texture patterns and the liquid phase viscosity on the wetted area is studied. It is found that both parameters have a strong influence on the results. For physical mass transfer, the study of the transient behavior and the impact of the liquid load on the absorption rate is assessed. It is observed that lower liquid loads maximize mass transfer coefficients but also enhance liquid misdistribution (i.e. with the possibility of hindering mass transfer). An optimum liquid load is found where the effect of liquid misdistribution can be avoided, maximizing gas absorption.
H. Abbasfard - One of the best experts on this subject based on the ideXlab platform.
-
simulation and feasibility analysis of Structured Packing replacement in absorption column of natural gas dehydration process a case study for farashband gas processing plant iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: S. M. Jokar, Mohammad Reza Rahimpour, Hamid Reza Rahimpour, Hossein Momeni, H. AbbasfardAbstract:Abstract Application of Structured Packing in separation processes like natural gas dehydration has been increased since last few years. Replacement of the existing trayed column with that of Structured Packing can enhance the capacity and performance of the natural gas dehydration process. In this work, the natural gas dehydration plant of Farashband gas processing plant has been simulated. The profile of concentration, temperature and pressure in absorption column was obtained. A computer program, prepared with Visual Basic, has been proposed to calculate the height equivalent to a theoretical plate (HETP) of Structured Packing. The effect of some important parameters of inlet Tri-ethylene glycol (TEG) and natural gas on the performance of absorption column have been analyzed. Results show that revamp of trays with Structured Packing, can reduce outlet natural gas dew point and improve the positive effect of other parameters on the performance of dehydration unit. Moreover, the most significant factors affecting the HETP were investigated which were less than 15% effective. Finally, the cost of the modification project for the absorption column in the Farashband gas processing plant was calculated. The cost is evaluated 202,909 $ in this case and replacing was found economically justifiable.
-
Simulation and feasibility analysis of Structured Packing replacement in absorption column of natural gas dehydration process: A case study for Farashband gas processing plant, Iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: S. M. Jokar, Mohammad Reza Rahimpour, Hamid Reza Rahimpour, Hossein Momeni, H. AbbasfardAbstract:Application of Structured Packing in separation processes like natural gas dehydration has been increased since last few years. Replacement of the existing trayed column with that of Structured Packing can enhance the capacity and performance of the natural gas dehydration process. In this work, the natural gas dehydration plant of Farashband gas processing plant has been simulated. The profile of concentration, temperature and pressure in absorption column was obtained. A computer program, prepared with Visual Basic, has been proposed to calculate the height equivalent to a theoretical plate (HETP) of Structured Packing. The effect of some important parameters of inlet Tri-ethylene glycol (TEG) and natural gas on the performance of absorption column have been analyzed. Results show that revamp of trays with Structured Packing, can reduce outlet natural gas dew point and improve the positive effect of other parameters on the performance of dehydration unit. Moreover, the most significant factors affecting the HETP were investigated which were less than 15% effective. Finally, the cost of the modification project for the absorption column in the Farashband gas processing plant was calculated. The cost is evaluated 202,909 $ in this case and replacing was found economically justifiable. © 2014 Elsevier B.V.
