Liquid entrainment in tray columns with downcomers

Kozioł, Antoni; Maćkowiak, J.

doi:10.1016/0255-2701(90)87003-2

Cited by 13 publications

(11 citation statements)

References 8 publications

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“…Therefore, excessive entrainment decreases the capacity and tray efficiency. Remedial steps must be carried out in the industrial application when the entrainment reaches 5 % of the liquid load . In this research, the entrainment of the TST was tested, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Hydrodynamic Characteristics in the Counter‐Flow Total Spray Tray

et al. 2019

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The capacity of a column is limited by the distribution of gas and liquid, especially in case of large-diameter cross-flow trays. In order to solve the bottleneck, a new counter-flow tray named total spray tray (TST) was put forward. Taking air/water as medium, the hydrodynamic behavior, including the pressure drop, weeping, entrainment, and clear liquid height, was investigated, in comparison with the CTST, which had a higher capacity. Based on experimental data, the correlations of the TST pressure drop were established by regression analysis method. The experimental results show that the TST has a lower wet pressure drop and less weeping. More interestingly, its clear liquid height can be self-adjusting with the variation of the gas kinetic energy factor, which is beneficial to improving the capacity.

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Section: Resultsmentioning

confidence: 99%

Hydrodynamic Characteristics in the Counter‐Flow Total Spray Tray

et al. 2019

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“…Entrainment rates E eff up to 5 % are often tolerated but can significantly diminish the separation efficiency of mixtures with high volatility, where the concentration profiles between each stage vary significantly from each other. Capture trays represent the most prevalent measurement method to investigate the influence of operation parameters on entrainment rates , . Advantages of this method are the generation of reproducible rates and an acceptable installation effort.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Entrainment Control Using a Newly Developed Telecentric Inline Probe

Schulz

Schäfer

Bart

2019

Chemie Ingenieur Technik

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This contribution presents a novel approach to investigate entrainment in distillation and absorption columns. An image‐based probe allows precise droplet detection at various radial and axial positions above trays. Validations achieve an average error of 6.4 % (monospheres 9.2–114.4 µm) and 3 % (monodisperse droplet stream up to 19 m s−1 and 74.5 µm). Experiments in a DN 450 cold flow test rig show an increasing (decreasing) share of larger droplets with higher gas (liquid) loads. Locally measured droplet sizes depend on probe position as well as tray design and enable an extrapolation to integral entrainment rates.

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“…3 As entrained liquid is able to considerably reduce the purity of the product stream leaving the column head, many authors discuss operation and design strategies to diminish this reduction of separation efficiency. 4,5 While experiments at varying operation parameters are widely performed but also limited to fluid flows and properties, [6][7][8] the tray design exhibits more parameters for examination and by that poses more open questions. 5,[9][10][11][12][13] As only few authors study the impact of weir height 9,14 and design 15 on entrainment rates, this article demonstrates how to reduce entrainment rates with aid of triangular notched and picket fence weirs.…”

Section: Introductionmentioning

confidence: 99%

Impact of weir design on entrained liquid in tray columns

2020

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Malfunction of the counter-current flow inside tray columns by entrainment of the liquid phase to higher stages depends on operation parameters but also internal design. The article covers the impact of weir design in terms of triangular notched and picket fence weirs on entrainment above sieve trays. A capture tray enables collection and weighing of the entrained liquid, while an image-based measurement technique additionally observes the respective droplet regime. Experimental results identify lower entrainment rates in case of advancing weir heights and use of a picket fence design. Still, tray designers should preset the desired operation range, as advancing weir heights and picket fence design limit the liquid tray capacity. Furthermore, image analysis enables an extrapolation of the locally detected liquid to an integral entrainment rate for comparison with the conservative capture tray method, as calculated entrainment correlations do not meet the experimental data at each operating point.

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Liquid entrainment in tray columns with downcomers

Cited by 13 publications

References 8 publications

Hydrodynamic Characteristics in the Counter‐Flow Total Spray Tray

Hydrodynamic Characteristics in the Counter‐Flow Total Spray Tray

Entrainment Control Using a Newly Developed Telecentric Inline Probe

Impact of weir design on entrained liquid in tray columns

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