Oscillating behavior on distillation trays‐II

Biddulph, Michael W.

doi:10.1002/aic.690210104

Cited by 22 publications

(5 citation statements)

References 8 publications

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“…where S LG shows the mass transfer rate from the liquid phase to the gas phase and vice versa. 1) The local balance condition must be satisfied by the mass transfer between the phases, so…”

Section: Basic Equationsmentioning

confidence: 99%

“…Hence, by determining the entrainment limits and liquid weeping of the trays, appropriate information can be obtained for enhancing the performance in towers. The weep fraction and dry tray pressure drop are two main hydraulic factors determining the lower operation limit for a tray [1][2][3]. The sieve trays result in the leakage of liquid within the deck holes at low vapor rates and decrease their normal operation window.…”

Section: Introductionmentioning

confidence: 99%

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Computational Fluid Dynamics versus Experiment: An Investigation on Liquid Weeping of Nye Trays

et al. 2020

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The weeping phenomenon was investigated using some experimental tests and a numerical model. The tests were performed within a 1.22‐m‐diameter pilot‐scale column including two chimney trays and two Nye test trays with an air‐water system. The rates of weeping were measured in the Nye trays with two heights of the weir and a hole area of 5 %. Moreover, the weeping rates in the outlet and inlet halves of the Nye tray and the total weeping rate were calculated. In the next step, an Eulerian‐Eulerian computational fluid dynamics (CFD) technique was used. The results show good agreement between the attained CFD findings and the experimental data.

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“…where S LG shows the mass transfer rate from the liquid phase to the gas phase and vice versa. 1) The local balance condition must be satisfied by the mass transfer between the phases, so…”

Section: Basic Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics versus Experiment: An Investigation on Liquid Weeping of Nye Trays

et al. 2020

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“…Generally, there are two critical points for the column operation: the “weep point,” which refers to the lowest gas velocity of liquid weeping (weeping fraction = 0%), and the “seal point,” which is the highest gas velocity for liquid entire dumping (weeping fraction = 100%) 9 . Comparing with the seal point, hydraulic properties are more commonly researched at the weep point, 10–14 which is closer to the normal operating range. Although gas–liquid horizontal oscillation will occur at the weep point, it can only affect the liquid hydraulic gradient and does little destructive to trays.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and fundamental models of gas–liquid surging for valve columns

Liu

Cao

et al. 2021

AIChE Journal

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The gas–liquid streams in valve columns are likely to surge at low gas velocities, which degrades tray performances and threatens production safety. Therefore, the gas–liquid surging mechanism and vibration properties were investigated in this article. First, the theory of gas–liquid unstable flow at the seal point was proposed based on the principle of lowest energy. Then, the evolution mechanism, gas–liquid flow characteristics, and essential condition of surging are proposed. Meanwhile, experiments were carried out in a Φ580 mm valve column; the frequency spectral and hydraulic characteristics of surging were in accordance with the expected surging mechanism. Moreover, the surging vanish point criterion and safe operating superficial gas velocity for valve columns were advanced. Finally, fundamental models for surging frequency and amplitude were established. The models are in close accordance with the experimental data, which suggests that they could accurately describe the surging behavior.

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“…In this case, the liquid static head on the tray overcomes the gas pressure drop, thus causing the liquid to descend through the tray perforations or valve holes and ultimately trigger weeping . Weeping is an undesirable phenomenon as it reduces tray efficiency and thus adversely affects the separation achieved by distillation columns …”

Section: Introductionmentioning

confidence: 99%

Experimental study and modeling of weeping rate in rectangular large‐scale valve trays

et al. 2019

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Weeping is an important hydraulic parameter that needs to be considered for valve trays and for calculations in the distillation field. Therefore, the accurate prediction of weep rate is crucial for the optimal design of valve trays. First, the effects of gas and liquid loads and weir height on weep rate, tray pressure drop, and actual bubbling area were studied in a 1.5 m × 0.61 m cold simulator. Second, the weep modes on the valve tray were analyzed in detail. A theoretical model was then derived to calculate weeping. The model showed a clear relationship between the weep rate and the fractional bubbling area. The experimental data showed that the weir height substantially affected the orifice coefficient of the liquid passing through the valve. Finally, the relation between weir height and orifice coefficient was obtained by fitting the experimental data. The agreements were good, and the maximum deviations were approximately 25%.

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Oscillating behavior on distillation trays‐II

Cited by 22 publications

References 8 publications

Computational Fluid Dynamics versus Experiment: An Investigation on Liquid Weeping of Nye Trays

Computational Fluid Dynamics versus Experiment: An Investigation on Liquid Weeping of Nye Trays

Mechanism and fundamental models of gas–liquid surging for valve columns

Experimental study and modeling of weeping rate in rectangular large‐scale valve trays

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