Numerical investigation of the inertial loss coefficient and the porous media model for the flow through the perforated sieve tray

Tseng, Chien-Chou; Li, Cheng Jui

doi:10.1016/j.cherd.2015.12.017

Cited by 20 publications

(12 citation statements)

References 18 publications

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“…The number of the perforated holes at each tray is 300 for this small-scale FGD tower. However, this number exceeds 200,000 for the large-scale FGD tower [4]). Considering the extremely large ratio of hole at tray to height and width of the tower, the computation cost can be very large for simulation of the fullscale tower.…”

Section: Introductionmentioning

confidence: 94%

“…A momentum sink term M, as shown in Equation ( 2), is activated in the designated porous media region to compensate the pressure loss because the detailed solid boundary is not resolved [4,24,25]:…”

Section: Porous Media Modelmentioning

confidence: 99%

“…The porous media model has already been found to be able to replace the detailed structures for flow past packed beds, filter papers, and perforated plates [24][25][26][27]. The empirical coefficients of the porous media model can be tabulated from Idelchik [28], and the velocity and pressure for a gas flow past tray tower by using porous media model are very consistent with that with a real perforated structure [4], saving significant computational time from the grid resolution near the trays.…”

Section: Introductionmentioning

confidence: 99%

“…In order to reduce the environmental acidification of sulfur dioxide (SO 2 ) from the fossil fuel power plants or similar facilities, a flue gas desulfurization (FGD) tower is used to absorb the SO 2 component from the exhaust gas before it enters the environments [1,2]. Downward alkaline solution injected from spray nozzles mixes with the upward exhaust gas within the tower [2][3][4]. During the desulfurization process, the gas SO 2 dissolves into alkaline solution in aqueous phase to form the sulfurous acid (SO 2 •H 2 O), and the ensuing dissociation produces sulfurous by-products, such as bisulfite (HSO 3 − ) and sulfite (SO 3 2− ).…”

Section: Introductionmentioning

confidence: 99%

“…The ideal mathematical model that simplifies the flow conditions with uniform velocity [1,[6][7][8] could hardly capture these complex geometric effects within a facility, and hence, the Computational Fluid Dynamics (CFD) technique can provide more insightful information and benefit to optimal design. CFD has already been applied widely to solve the multiphase flow dynamics within the FGD tower [4,5,[9][10][11][12][13][14][15][16] and other facilities or processes with relevant fields, such as scrubbers of CO 2 emissions [11] and fine particle dust concentrators [17]. Depending on its approach to the interactions between liquid-solid and gas phase, the multiphase flow model can be categorized as an Eulerian-Lagrangian model [9,[11][12][13][14] and an Eulerian-Eulerian model [5,10].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigations for the Two-Phase Flow Structures and Chemical Reactions within a Tray Flue Gas Desulfurization Tower by Porous Media Model

Tseng

2022

Applied Sciences

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The computational cost of the full-scale flue gas desulfurization (FGD) tower with perforated sieve trays is too high, considering the enormous scale ratio between the perforated hole at the sieve tray and the relevant size of the full-scale tower. As a result, the porous media model is used to replace the complex perforated structure at the sieve tray in this study, which has been validated for the measured data for both the small- and full-scale FGD tower. Under a lower inlet gas volume flow rate, the simulation result of the four-tray tower indicates that the uprising gas flow of high SO2 mass fraction can move along the wall of the tower. This region lacks two-phase mixing and, hence, its desulfurization efficiency is similar to that of empty and one-tray towers under the same flow conditions. However, when the gas volume flow rate increases, the liquid column becomes larger because of the stronger inertial of the uprising gas flow. In this situation, the implementation of the sieve tray suppresses the deflection of liquid flow and provides a better mixing within sieve trays, leading to a noticeable increase in desulfurization efficiency. This study provides insightful information for the design guideline for the relevant industries.

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Section: Introductionmentioning

confidence: 94%

Section: Porous Media Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical Investigations for the Two-Phase Flow Structures and Chemical Reactions within a Tray Flue Gas Desulfurization Tower by Porous Media Model

Tseng

2022

Applied Sciences

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Comparative study of dry pressure drop and flow behaviour of gas flow through sieve plate packing

et al. 2020

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Sieve plate packing is a newly developed packing that has been used in several industries due to its simple structure and operating flexibility, and no liquid flooding. In this work, first, systematic experiments were conducted to measure the pressure drop of gas flow through six sieve plate packings. The results indicated that the geometric characteristics of the packing have complicated effects on the pressure drops. Based on this, CFD simulations on the gas flow field were conducted using the realizable k‐ε model, and flow behaviours such as the pressure drop, pressure nephogram, and velocity distributions within different packings were obtained. The simulation results clearly showed interesting flow patterns, including the contraction and expansion of the gas stream through the sieve hole, the flow separation on the sharp edge of the hole, and the vortexes formed when gas impacts the downstream plate. By comparing the flow patterns and the pressure drop under different packings operating at different conditions, the effects of the geometric characteristics of the packing on the pressure drop could be clearly distinguished from the flow behaviours, so that the variations in pressure drop with various packing structures were clearly indicated. Finally, based on the experimental data and the simulated results, correlations for the prediction of the pressure drops were proposed. This work will provide a useful basis for understanding the flow behaviour of gas and liquid two‐phase flow in sieve plate packing.

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Nye tray vs sieve tray: A comparison based on computational fluid dynamics and tray efficiency

et al. 2021

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Nye and sieve trays were hydrodynamically simulated and compared. The simulations were performed in a Eulerian-Eulerian framework under unsteady (transient) conditions at industrial scale. Conducted on an air-water system, the simulations included three dimensions and two phases. The velocity distribution across the tray, the height of clear liquid, the froth height, and the pressure drop were investigated and compared with experimental data. Péclet number was calculated using hydrodynamic and geometric parameters. The tray efficiencies were also predicted to further compare the two trays. The results showed that the liquid flow was steadier on the Nye tray rather than the sieve tray, possibly because of the special structure of the liquid and gas inlets for the Nye tray.

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Numerical investigation of the inertial loss coefficient and the porous media model for the flow through the perforated sieve tray

Cited by 20 publications

References 18 publications

Numerical Investigations for the Two-Phase Flow Structures and Chemical Reactions within a Tray Flue Gas Desulfurization Tower by Porous Media Model

Numerical Investigations for the Two-Phase Flow Structures and Chemical Reactions within a Tray Flue Gas Desulfurization Tower by Porous Media Model

Comparative study of dry pressure drop and flow behaviour of gas flow through sieve plate packing

Nye tray vs sieve tray: A comparison based on computational fluid dynamics and tray efficiency

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