A corrugation geometry based model for efficiency of structured distillation packing

Olujić, Žarko; Kamerbeek, A.B.; Graauw, J. de

doi:10.1016/s0255-2701(99)00068-9

Cited by 104 publications

(133 citation statements)

References 12 publications

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“…The fractional mass-transfer area, a m /a d , is the subject of considerable controversy. The Delft correlation 73 and that of Onda et al 3 predict that the available area for mass transfer approaches the geometrical surface area of the packing exponentially as the liquid rate is increased. The BRF85 correlation 6 for metal gauze structured packings assumes that a m ¼ a d under all operating conditions.…”

Section: Implications: Mass-transfer Areamentioning

confidence: 96%

New mass‐transfer correlations for packed towers

2011

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in Wiley Online Library (wileyonlinelibrary.com).Rate-based calculations for trayed and packed columns offer process engineers a more rigorous and reliable basis for assessing column performance than the traditional equilibrium-stage approach, especially for multicomponent separations. Although the mathematics, thermodynamics, and transport-related physics upon which nonequilibrium separations theory is founded are generally true, it is also true that rate-based simulations today suffer from a serious weakness-they are ultimately tied to underlying equipment performance correlations with questionable predictive capability. In the case of packed columns operated countercurrently, correlations are required for the masstransfer coefficients, k x and k y , for the specific area participating in mass transfer, a m , for the two-phase pressure drop, (Dp/Z) 2/ , and for the flood capacity of the column. In particular, it is generally well known that packing mass-transfer correlations available in the public domain are unreliable when they are applied to chemical systems and column operating conditions outside of those used to develop the correlations in the first place. For that reason, we undertake the development of dependable, dimensionally consistent, correlating expressions for the mass-transfer-related quantities k x , k y , and a m for metal Pall rings, metal IMTP, sheet metal structured packings of the MELLAPAK type, and metal gauze structured packings in the X configuration, using a new data fitting procedure. We demonstrate the superior performance of these correlations for a wide range of chemical systems and column operating conditions, including distillations as well as acid gas capture with amines. Further, we show that these new correlations lead to predictions for the relative interfacial area participating in mass transfer that can be greatly in excess of the geometrical surface area of the packing itself.

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Section: Implications: Mass-transfer Areamentioning

confidence: 96%

New mass‐transfer correlations for packed towers

2011

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“…The geometrical characteristics of the regular packing, the physical properties of liquid and packing material, and other factors affect the liquid distribution inside the column, and this has been the subject of other studies. 5,[9][10][11][12][13][14] Experimental data on the effect of the operation parameters on the pressure drop, mass transfer efficiency, and distribution of the local flow parameters in a distillation column with a 0.9-m diameter and a regular aluminum Koch 1Y packing are shown in Pavlenko et al 12,13 It is shown by Nicolaiewsky et al 14 and Nicolaiewsky and Fair 15 that for the vertical plane sheets a decrease in surface tension and contact angle improves liquid spreading and surface wetting both for standard and corrugated sheets. The surface texture and roughness of a sheet also improve its wetting at the expense of contact angle reduction.…”

Section: Introductionmentioning

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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“…The Brito model predicts a e /a p higher than 1. The reason is that it combines the rivulet fl ow, fl uctuation on the free surface, fi lm tear, droplet from the gas blow, 38 , which is deduced from numerous kinds of packings include both random packing and structured packing, is the most similar to the present CFD model. As we can see, although researchers have proposed various models to calculate the effective wetting ratio, none of them is universal.…”

Section: Billet and Schultesmentioning

confidence: 84%

“…37 , Olujić et al 38 and so on. They considered many specifi c conditions such as packing structure and operating condition.…”

Section: Billet and Schultesmentioning

confidence: 98%

A multiscale methodology for CFD simulation of catalytic distillation bale packings

Ding

Xiang

Liu

2016

Polish Journal of Chemical Technology

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A multiscale model for simulating the hydrodynamic behavior of catalytic bale packings has been proposed. This model combines computational fl uid dynamics (CFD) and macroscopic calculation. At small scale calculation, the CFD model includes 3-D volume-of-fl uid (VOF) simulation within representative elementary unit (REU) under unsteady-state conditions. The REU constitutes gauze and catalyst domain, and porous media model is applied. At large scale calculation, a new mechanistic model deduced from the unit network model is employed. Based on liquid split proportion from small scale calculation, liquid distribution of the entire bale packing can be predicted. To evaluate different packing design, three common bale arrangements, i.e. one-bale, nine-bales and seven-bales, are compared. The area-weighted Christiansen uniformity coeffi cient is introduced to assess the distribution performance. A comparison between simulation and experimental results is made to validate the multiscale model. The present methodology is proved to be effective to analysis and design of catalytic distillation columns.

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A corrugation geometry based model for efficiency of structured distillation packing

Cited by 104 publications

References 12 publications

New mass‐transfer correlations for packed towers

New mass‐transfer correlations for packed towers

Experimental investigation of liquid distribution over structured packing

A multiscale methodology for CFD simulation of catalytic distillation bale packings

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