Experimental investigation of liquid maldistribution in random packed columns using temperature measurements

Winkler, Thomas; Klein, Harald; Rehfeldt, Sebastian

doi:10.1016/j.ces.2021.117350

Cited by 4 publications

(4 citation statements)

References 18 publications

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“…Six inlet configuration were studied. The configurations observed in Figure (b,c) are similar to those studied by Winkler et al and Jia et al and are referred to here as rhomboid and rectangular. The next configuration, Figure (d) is called radial where the distance between two holes is based on equidistant circles, as described in Arthur .…”

Section: Mathematical Modelingsupporting

confidence: 81%

Assessing the Performance of Hydrotreating Reactor of Diolefin with Different Inlet Configurations via Computational Fluid Dynamics

Penteado

Peres

Santos

et al. 2023

Ind. Eng. Chem. Res.

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Liquid maldistribution is an important parameter in the study of fixed bed reactors (FBRs) as it ensures uniformity in the catalytic reactions. The hydrotreating process in this study used a three-dimensional CFD model comparing six different inlet configurations. The model considers the bed porous structure, hydrodynamics, reaction kinetics, and heat and mass transfer. An industrial reactor was simulated using the commercial Ansys Fluent v19.2 CFD package. This study concluded that the performance of the reactor may increase as the flow uniformity improves, as a result of a better configuration in the inlet zone. This was performed by comparing the most frequently used configurations in the literature, and one ideal case was also studied. The rhomboid configuration showed a better result considering the maldistribution factor. As expected due to its flow uniformity, the diolefin conversion of the reactor has an improvement of 8% in comparison to the spiral configuration. The results presented in this work will be useful to optimize the design of existing and new commercial FBRs as well as their performance.

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Section: Mathematical Modelingsupporting

confidence: 81%

Assessing the Performance of Hydrotreating Reactor of Diolefin with Different Inlet Configurations via Computational Fluid Dynamics

Penteado

Peres

Santos

et al. 2023

Ind. Eng. Chem. Res.

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“…Tray or packed columns are mostly used in thermal separation processes such as distillation, absorption, or stripping. Although high product purities can be obtained in this gravity-based equipment, the capacity is limited by the diameter of the column and the upper hydrodynamic operating limit, also known as flooding . Alternative equipment to enlarge the operating window is a rotating packed bed (RPB) that utilizes centrifugal force instead of gravity to intensify the contact between the two phases.…”

Section: Introductionmentioning

confidence: 99%

“…Maldistribution in the gas and liquid phases has been a challenge in both types of equipment, i.e., columns and RPBs. Both equipment types tend to show maldistribution, especially for the liquid phase. , Since in an RPB, the cross-sectional area of the packing increases from the inner to the outer packing diameter, the liquid load decreases throughout the packing, which may result in dewetting of packing surface areas at some parts. Therefore, liquid maldistribution along the radius of the rotor is expected to account for the reduced mass transfer performance of RPBs.…”

Section: Introductionmentioning

confidence: 99%

“…Although high product purities can be obtained in this gravity-based equipment, the capacity is limited by the diameter of the column and the upper hydrodynamic operating limit, also known as flooding. 1 Alternative equipment to enlarge the operating window is a rotating packed bed (RPB) that utilizes centrifugal force instead of gravity to intensify the contact between the two phases. Compared to static equipment, they hold the potential for an extended operating window providing an intensified mass transfer in compact equipment with added flexibility.…”

Section: Introductionmentioning

confidence: 99%

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Radial Temperature Profile Measurements to Understand Mass Transfer in Rotating Packed Bed Distillation

Qammar,

Pyka,

Koop

et al. 2023

Ind. Eng. Chem. Res.

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There is a considerable demand to understand the mass transfer fundamentals in rotating packed beds (RPB), especially for vapor-side controlled processes. An online measurement method allowing the determination of radial temperature profiles was developed to calculate the separation efficiency in the packing and casing via known VLE data. Furthermore, a radial separation efficiency profile was established to understand the nonuniformities in the separation performance of different packing parts that will eventually help optimize the packing design. Binary distillation experiments were carried out with an ethanol–water system in a packed and empty rotor. Investigations show that the radial separation efficiency achieved along the radius is a function of rotational speed and radial packing length, showing a maximum in the middle of the packed rotor under the operating and design conditions investigated. Furthermore, initial radial temperature profile measurements with an advanced Zickzack packing, developed by additive manufacturing, showed that the loss of separation efficiency due to radial liquid maldistribution in conventional RPB packings could be reduced with the proper packing design, enabling uniform liquid distribution.

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Simulation of heat and mass transfer in a random packed column operated as a cooling tower using the TUM-WelChem cell model

Winkler

Stops

Siebe

et al. 2022

Chemical Engineering Research and Design

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Experimental investigation of liquid maldistribution in random packed columns using temperature measurements

Cited by 4 publications

References 18 publications

Assessing the Performance of Hydrotreating Reactor of Diolefin with Different Inlet Configurations via Computational Fluid Dynamics

Assessing the Performance of Hydrotreating Reactor of Diolefin with Different Inlet Configurations via Computational Fluid Dynamics

Radial Temperature Profile Measurements to Understand Mass Transfer in Rotating Packed Bed Distillation

Simulation of heat and mass transfer in a random packed column operated as a cooling tower using the TUM-WelChem cell model

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