Modeling Flow-Guided Sieve Tray Hydraulics Using Computational Fluid Dynamics

Li, Qunsheng; Li, Lun; Zhang, Manxia; Lei, Zhigang

doi:10.1021/ie402008c

Cited by 13 publications

(9 citation statements)

References 19 publications

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“…The bubble promoter protrudes near the liquid inlet at an angle of 10° with the horizontal direction . When liquid flows across the bubble promoter, the mass flow rate, clear liquid height, and liquid inlet are monitored and exported to calculate the momentum transfer coefficient of the bubble promoter.…”

Section: Resultsmentioning

confidence: 99%

“…Given the average velocity, the following expression for liquid momentum conservation of the i th lane in the x ‐direction can be developed:

n_{i} {normalu}_{fg}^{2} A_{f normalg} {δρ}_{G} = \frac{1}{2 N + 1} Q_{L} ρ_{L} ([], \overset{u}{true} - u_{monospaceL monospace, in} ((), z)) + \frac{1}{2 N + 1} Q_{L} ρ_{L} λ S_{i}

where n i represents the total number of flow‐guiding holes along the i th lane, u fg is the gas velocity through the flow‐guiding holes, and u sieve : u fg = 1:0.87 …”

Section: Resultsmentioning

confidence: 99%

“…Sieve trays are the most common type of column internals and have been widely utilized in distillation, absorption, and other separation processes due to their good operating performance, simple structure, and low manufacturing cost . The distribution of gas–liquid two phases above the tray determines the hydrodynamic and mass transfer performance .…”

Section: Introductionmentioning

confidence: 99%

“…Although the hydrodynamic performance of FGSTs has been investigated previously, an in‐depth study of this tray is not sufficient. Its design mainly depends on empirical correlations, which roughly associate the number of flow‐guiding holes with the gas–liquid loading …”

Section: Introductionmentioning

confidence: 99%

“…Based on previous work, we conducted a new study on a FGST using CFD to optimize the design and improve its separation performance. With the information obtained from the CFD simulation, a momentum conservation equation was developed for the liquid phase in the x ‐direction to derive the FGST momentum transfer coefficient and resistance coefficient, both of which are significant for the quantitative characterization and design of flow‐guiding holes.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Performance analysis and quantitative design of a flow‐guiding sieve tray by computational fluid dynamics

Zhao

et al. 2019

AIChE Journal

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An evolution of the traditional sieve tray, the flow‐guiding sieve tray (FGST), has been utilized in many separation processes, especially for handling viscous systems. The objectives of this work are to optimize the design process of FGSTs and realize the full potential of their separation performance. A computation fluid dynamic (CFD) model that incorporated the modified interphase momentum transfer term was developed. Simulated measures of hydrodynamic performance, such as pressure drop, weeping, entrainment, and clear liquid height agree well with the experimental data, thus verifying the accuracy and reliability of the CFD model established in this work. Furthermore, based on the obtained hydrodynamic parameters, a quantitative model for designing flow‐guiding holes was established and validated by modifying an experimental FGST (diameter 476 mm) and reconstructing an industrial sieve‐tray tower (diameter 1,200 mm). The hydrodynamic parameters and quantitative model are of vital importance for better design and further modification of FGST.

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Section: Resultsmentioning

confidence: 99%

“…Given the average velocity, the following expression for liquid momentum conservation of the i th lane in the x ‐direction can be developed:

n_{i} {normalu}_{fg}^{2} A_{f normalg} {δρ}_{G} = \frac{1}{2 N + 1} Q_{L} ρ_{L} ([], \overset{u}{true} - u_{monospaceL monospace, in} ((), z)) + \frac{1}{2 N + 1} Q_{L} ρ_{L} λ S_{i}

where n i represents the total number of flow‐guiding holes along the i th lane, u fg is the gas velocity through the flow‐guiding holes, and u sieve : u fg = 1:0.87 …”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Performance analysis and quantitative design of a flow‐guiding sieve tray by computational fluid dynamics

Zhao

et al. 2019

AIChE Journal

Self Cite

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State‐of‐the‐Art of Advanced Distillation Technologies in China

et al. 2016

Chem Eng & Technol

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Focusing on energy conservation and process intensification, a comprehensive overview of advanced distillation technologies in the past four decades in China is presented. Novel trays, packings, and gas and liquid distributors based on the fundamentals of such technologies are described. Hybrid distillation and distillation assisted by an external force field on the basis of process intensification principles like reactive distillation, extractive distillation, Higee technology, microwaveassisted distillation, etc. are reported. Energy-saving technologies such as dividing-wall column and internally heat integrated distillation column together with some important examples regarding the industrial application of advanced distillation technologies are evaluated. As a guide to develop distillation processes, a green distillation concept is proposed. Future perspectives of distillation techniques in China are indicated.

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CFD study on flow characteristics of sieve tray columns with circular downcomers

Su,

Wang,

2024

Can J Chem Eng

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To investigate the flow characteristics of sieve tray columns with circular downcomers, the Euler–Euler gas–liquid two‐phase flow model is used to simulate a three‐dimensional sieve tray column. Each phase is regarded as an interpenetrating continuum with independent transport equations. The velocity distribution, clear liquid height, and foam layer height are predicted by the model. The correlation is established for predicting the clear liquid height on the sieve tray. The results show the following: (1) The sensitivity of the clear liquid height to the gas phase load is greater than that of the liquid phase load. (2) When the gas–liquid distribution is stable, the flow on the round sieve tray column presents a piston flow pattern. (3) The average liquid holdup of the circular downcomer of the three heights all showed a slow decrease at first, and then an inflection point appeared near the height of 0.02 m, after which the liquid holdup dropped sharply. (4) The established correlation has good predictive performance for calculating the clear liquid height in the column, and the relative error between the calculated value and the actual value is less than 10%.

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Modeling Flow-Guided Sieve Tray Hydraulics Using Computational Fluid Dynamics

Cited by 13 publications

References 19 publications

Performance analysis and quantitative design of a flow‐guiding sieve tray by computational fluid dynamics

Performance analysis and quantitative design of a flow‐guiding sieve tray by computational fluid dynamics

State‐of‐the‐Art of Advanced Distillation Technologies in China

CFD study on flow characteristics of sieve tray columns with circular downcomers

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