Mass-transfer characteristics of valve trays

Scheffe, Richard D.; Weiland, Ralph H.

doi:10.1021/ie00062a010

Cited by 32 publications

(25 citation statements)

References 8 publications

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“…Since the tray configurations, including the valve geometry, mainly affects the bubbles' size, the influence of these motions on k L can therefore be neglected. The similar conclusion by Richard et al 1 also indicated that the mass transfer coefficient was not a strong function of tray type but the interfacial area was. As shown in Figures 9 and 10, the greater interfacial area a 0 was obtained due to the longer effective perimeter l. Statistically, comparing to the case of V1, a 0 of RV is about 12.49% higher, and that of DRV is 45.64% higher.…”

Section: Froth Porositysupporting

confidence: 59%

“…The calculation results, as given in Figures 9, 10, and 12, indicate that Eq. 28 fits the data from Richard et al 1 with a mean deviation of 8.28%, and represents the experimental data of all three valves in this study with a mean deviation of 1.22%. The comparison between the correlated and experimental interfacial areas, as more clearly shown in Figure 12, justifies Eq.…”

Section: Froth Porositymentioning

confidence: 87%

“…The experimental interfacial areas of all three valves (V1, RV, and DRV) in this study, as well as the experimental data of V1 valve by Richard et al, 1 are used to examine the accuracy and applicability of Eq. 28.…”

Section: Froth Porositymentioning

confidence: 99%

“…Since the design of most modern valves is mainly based on experience, being lack of theoretical research, the accurate simulation of separation processes becomes difficult. To our knowledge, only Richard et al 1 reported the mass transfer characteristics of valve trays using dimensional analysis to obtain an empirical expression for the interfacial area. In addition, only V-1 type valve was investigated, and the mechanism of the interface formation had not been theoretically analyzed in their work.…”

Section: Introductionmentioning

confidence: 99%

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The impact of valve tray geometry on the interfacial area of mass transfer

et al. 2008

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in Wiley InterScience (www.interscience.wiley.com).The interfacial area of mass transfer is one of the key parameters in valve tray design, and the valve geometry is the important structural parameter that determines the interfacial area. In this work, the hydrodynamic and mass-transfer characteristics of three different types of valve trays are investigated. The mechanism of bubbles deformation and breakage in the turbulent dispersion system is theoretically analyzed on the basis of Kolmogoroff's isotropic turbulence hypothesis, and a novel model is proposed to predict the interfacial area. The results show that the simulation results agree well with the experimental data. In contrast to most of the conventional models, the present model is capable of evaluating the effects of valve configuration on the interfacial area. The model is expected to guide effectively the design of valve trays which is widely applied nowadays.

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Section: Froth Porositysupporting

confidence: 59%

Section: Froth Porositymentioning

confidence: 87%

Section: Froth Porositymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The impact of valve tray geometry on the interfacial area of mass transfer

et al. 2008

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“…11,14,15 The experimental data are summarized in 13 However, the space height of the column was not provided; thus, the exact LP/SP ratio is unknown. Moreover, estimation was performed to obtain the LP/SP.…”

Section: Validation Of the Extended New Interfacial Area Modelmentioning

confidence: 99%

Prediction of gas–liquid interfacial area in valve trays

Wang¹,

Leng²,

Shao³

et al. 2015

AIChE Journal

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An accurate prediction of gas-liquid interfacial area is very important for the design and optimization of column trays. However, the difference of the gas-liquid flow regimes operating at different scale trays significantly affect the interfacial area calculation. Therefore, in this study, an interfacial area model operating at small column was established using the Kolmogorov's isotropic turbulence hypothesis. According to the analyzes of the gas-liquid flow phenomena of different scale columns, an assumption that the similarity principle of flow characteristics of gas-liquid in full contact was proposed. Moreover, a new model that can be used to predict the gas-liquid interfacial area of a large column with exiting the nonideal flow was obtained through the extension of the small tray interfacial area model based on this principle. Finally, the new model was tested by comparisons with the experimental results of references. The prediction accuracy significantly improved with the maximum deviation of approximately 40%. V C 2015 American Institute of Chemical Engineers AIChE J, 62: 905-915, 2016 Keywords: distillation, different scales, valve tray, interfacial area, physical model IntroductionDistillation is the major process in present and future petroleum and/or chemical industries.1 Heat and mass transfers between gas and liquid phases occur in trays during distillation. Briefly, these transfer processes occur via phase interface. Hence, the interfacial area is an important field of investigation in chemical engineering research. Generally, studies on the interfacial area have mainly focused on two aspects: (1) increasing the contact interfacial area of the gasliquid interface by some means or the optimization of equipment structures to enhance the mass and heat transfer processes and (2) developing gas-liquid interfacial area models to predict the transfer of mass or heat. Valve trays grafted with some special structures are widely used as contactors for distillation/absorption columns because of their high tray efficiency, relatively low pressure drop, and large operation range (enhanced performance).2 However, previous research on hydrodynamics and mass transfer has mainly focused on sieve trays, [3][4][5][6][7][8][9][10] and little attention has been centered on valve trays.11-15 Therefore, high-accuracy models should be developed on the basis of theoretical research regarding the actual flow characteristics of gas-liquid in valve trays to calculate the hydraulic and mass transfer rates. These models will provide theoretical guidance for the reasonable design and optimization of trays.Column diameter and height are two main parameters involved in industrial column design. The column diameter is controlled by two-phase flow hydrodynamic behavior (weeping or flooding), whereas the total column height is controlled by mass transfer parameters. 15 To date, the actual trays of a column (cf. column height) are determined by two main methods: (1) tray efficiency based on equilibrium stage model [16][17][18] an...

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Absorption

Karayiannis

Laso

2018

Kirk-Othmer Encyclopedia of Chemical Technology

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Absorption, or gas absorption, is a unit operation used in the chemical industry to separate gases by washing or scrubbing a gas mixture with a suitable liquid. One or more of the gas components dissolves or is absorbed in the liquid and is thus removed from the mixture. Absorption is currently one of the most important processes in chemical engineering not only for product recovery but also, and perhaps mainly, for pollutant removal. Intense industrial and academic effort is focused on optimizing the process, in terms process efficiency as well as commercial aspects. In this article, the fundamental principles of gas solubility and mass transfer, design and operation of industrial equipment with relevant examples of typical commercial gas absorption processes are discussed, including recent developments in these areas.

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Mass-transfer characteristics of valve trays

Cited by 32 publications

References 8 publications

The impact of valve tray geometry on the interfacial area of mass transfer

The impact of valve tray geometry on the interfacial area of mass transfer

Prediction of gas–liquid interfacial area in valve trays

Absorption

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