Mechanistic pressure drop model for columns containing structured packings

Brunazzin, Elisabetta; Paglianti, Alessandro

doi:10.1002/aic.690430205

Cited by 87 publications

(64 citation statements)

References 10 publications

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“…The model for the calculation of the pressure drop in the column, using the analogy of a gas flow along tubes, is offered by Brunazzi and Paglianti. 26 This model assumes that the pressure drop is determined by the friction of gas flowing along the channels of a structured packing as along a tube. The liquid phase, occupying some part of space, reduces the packing cross-section for the gas phase, affecting the pressure drop in the column.…”

Section: Investigation Resultsmentioning

confidence: 99%

Experimental investigation of liquid distribution over structured packing

Алексеенко¹,

Маркович²,

Evseev³

et al. 2008

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).The thickness of a liquid film on the structured packing inside a distillation column was measured at the region of counter-current flow of gas and liquid by fiber-optic sensors. The local distribution of liquid inside a typical geometrical cell formed by the corrugated Koch 1Y sheets was examined in this study. It is shown that, in the vicinity of the sheet contact points inside the cell, the liquid film thickness is maximal, and peculiar meniscuses are formed where liquid flow redistribution over the corrugation surface occurs. A counter gas flow decreases pulsations of the liquid film thickness by a factor of 1.5-2 on the rib and lateral surfaces of corrugation. Experimental data on the effect of operation parameters on the local distribution of liquid in the cell and the pressure drop in the column are presented.

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Section: Investigation Resultsmentioning

confidence: 99%

Experimental investigation of liquid distribution over structured packing

Алексеенко¹,

Маркович²,

Evseev³

et al. 2008

AIChE Journal

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show abstract

“…According to the shape, packings are classified into four different types: gauze packings, grid-type packings, metal sheet, and random packings [10,11]. In the structured packing, the sheets are arranged side by side with opposing channel orientations.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation of Dry Pressure Drop in High‐Capacity Structured Packings

Amini

Karimi-Sabet²,

Esfahany

2016

Chem Eng & Technol

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Experimental and numerical studies were conducted on the performance and capacity of structured packings for mixture separation with very low separation factor. Different formations and conditions of the innovative structured packing PACK-2100 with high surface area were studied to evaluate the main characteristics such as dry pressure drop. In addition, numerical simulation was performed to describe the details of the flow structure in these modified structured packings. Three-dimensional computational fluid dynamics modeling of PACK-2100 allowed for comparing the pressure drop in both laminar and turbulent flow regime. The obtained experimental and numerical data demonstrate the potential contribution of the packing to high-efficiency systems with low separation factor.

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“…It is well recognized that structured packings in packed columns enable to reduce the pressure drop and thus to reduce energy consumption [6]. The pressure drop in a structured packing consists of five stages [12]: 1) elbow loss and stream splitting in the bed entrance region (first packing layer) 2) collisional losses by jet streams at the criss-crossing junction within the packing layer 3) elbow loss by form drag at the transition between successive layers 4) elbow loss by jets striking the wall and subsequent flow redirection to the upper channels 5) changes due to stream recombination and sudden enlargement at the bed exit (last layer) Petre et al [12] showed that the major part of the pressure drop (65-72 %) occurs due to the gas-gas interactions in the open-channel segment.…”

Section: Pressure Drop Within Corrugated Sheetsmentioning

confidence: 99%

“…Therefore, appropriate design is necessary for decreasing costs and increasing the capacity [6]. Thus, specifying the flow pattern in both the gas and liquid phases and determining the effects of this pattern on the pressure drop are crucial steps to obtain an optimal design for the packed columns [7].…”

Section: Introductionmentioning

confidence: 99%

CFD Studies of Pressure Drop and Increasing Capacity in MellapakPlus 752.Y Structured Packing

Saleh

Hosseini

Shojaee

et al. 2011

Chem. Eng. Technol.

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Packed columns equipped with structured packings are widely used in separation processes. In this study, the hydrodynamics of MellapakPlus 752.Y was investigated using a computational fluid dynamics (CFD) approach. This packing includes short smooth bends at both ends of each corrugated sheet. Two adjacent sheets of a whole packing module were considered as computational domain. The CFD results indicated that the gas phase should be simulated using a turbulent model for F factors higher than 0.8. Thus, various two-equation turbulence models were evaluated for the gas phase in the CFD model. It was shown that the baseline k-x (BSL) model leads to a slightly improved prediction of the pressure drops compared with the experimental data. The effects of the bends on the structured packing were studied by the model. It was found that using bends in the packings is useful for increasing the capacity and decreasing the pressure drop of the systems.

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Mechanistic pressure drop model for columns containing structured packings

Cited by 87 publications

References 10 publications

Experimental investigation of liquid distribution over structured packing

Experimental investigation of liquid distribution over structured packing

Experimental and Numerical Simulation of Dry Pressure Drop in High‐Capacity Structured Packings

CFD Studies of Pressure Drop and Increasing Capacity in MellapakPlus 752.Y Structured Packing

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