Gas holdup in a trayed cold-flow bubble column

Kemoun, A.; Rados, Novica; Li, F.; Al‐Dahhan, Muthanna H.; Duduković, Milorad P.; Mills, Patrick L.; Leib, T.M.; Lerou, Jan

doi:10.1016/s0009-2509(00)00340-7

Cited by 23 publications

(15 citation statements)

References 3 publications

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“…In the present work, with the decrease in the free area from 23 to 4% there is a maximum increase of 15% in the gas hold-up and for constant free area of 4%, due to a decrease in the number of holes in the sectionalizing plate there is a decrease in the gas hold-up values by 3% at low value of V G equals to 0.062 m s −1 and by 8% at high value of V G equals to 0.295 m s −1 . Kemoun et al [12] has observed similar effect and has reported similar trend. An increased pressure drop (Table 5) across the sectionalizing plates with reduced free area (higher local energy dissipation rate) also contribute to the more efficient bubble break-up, reducing its average size and hence an increase in the gas hold-up.…”

Section: Effect Of % Fa Of the Sectionalizing Platesupporting

confidence: 58%

“…Dreher and Krishna [13] have not reported the clear liquid height (H c ) and hence the present correlation cannot be used to compare their data. The data of Kemoun et al [12] and De [18] could be partially compared with the present correlations but there is quite deviation in the predicted values as the sectionalizing plate of Kemoun et al [12] system has a 10% down comer area and only pipe gas sparger, whereas De [18] has used a single hole sparger and a loosely fitting stack of the sectionalizing plate in the system. Also, operating range of superficial gas velocity is significantly different than used in the present case.…”

Section: Validation Of Correlations On the Basis Of Literature Datamentioning

confidence: 55%

“…For lower range of V G , the increase in the gas hold-up is around 25% and this increment goes down with an increase in the V G . Kemoun et al [12] have observed similar behavior of gas hold-up with superficial gas velocity in a trayed bubble column. In the present work, with sectionalized bubble column around 33% fractional gas hold-up value was observed for the highest value of V G (0.295 m s −1 ) and for lowest free area of the sectionalizing plate in against 22% without sectionalization.…”

Section: Effect Of Superficial Gas Velocitymentioning

confidence: 75%

“…This increment reaches up to 7% for lowermost free area sectionalizing plate used in the present work. Kemoun et al [12] have reported that, with an increase in the number of holes in the sparger (with the same hole diameter) there is an increase in the overall fractional gas hold-up. In the present work, the possible reason for the observed increase in the fractional gas hold-up could be due to the combined effect of the decrease in the diameter of the sparger holes and increase in the number of the holes on the sparger plate, giving better gas distribution thereby reducing the extent of bubble coalescence.…”

Section: Effect Of Sparger Free Areamentioning

confidence: 99%

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Effect of internals and sparger design on mixing behavior in sectionalized bubble column

Doshi

Pandit

2005

Chemical Engineering Journal

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Section: Effect Of % Fa Of the Sectionalizing Platesupporting

confidence: 58%

Section: Validation Of Correlations On the Basis Of Literature Datamentioning

confidence: 55%

Section: Effect Of Superficial Gas Velocitymentioning

confidence: 75%

Section: Effect Of Sparger Free Areamentioning

confidence: 99%

See 2 more Smart Citations

Effect of internals and sparger design on mixing behavior in sectionalized bubble column

Doshi

Pandit

2005

Chemical Engineering Journal

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“…Dreher and Krishna [8] reported an increase in gas cap with increasing superficial gas velocity. Kemoun et al [17] investigated the effect of sieve trays on the time-averaged gas holdup profiles and the overall gas holdup in a cold-flow bubble column using g-ray computed tomography. Doshi and Pandit [10] gave the results of fractional gas holdup in a sectionalized bubble column, and found that the gas cap accumulated by bubbles was formatted below the partition plate.…”

mentioning

confidence: 99%

Parameters measurement of hydrodynamics and CFD simulation in multi‐stage bubble columns

et al. 2014

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The effect of superficial gas velocity and structural parameters of plate (perforated plate and tongue plate) on the hydrodynamics parameters of column are studied in a multi-stage bubble column, with 2000 mm height and 282 mm diameter of the multi-stage bubble column, by using the electrical resistance tomography (ERT) technique and computational fluid dynamics (CFD). According to the results, ERT and CFD techniques can be well applied to the measurement and estimation of gas-liquid two-phase processes. The gas holdups, the radial distribution of gas holdup and gas cap height strongly depend on the operating condition and tray structure. By increasing the superficial gas velocity, the gas holdup in the multi-stage bubble column increases. With a decrease of the open area ratio, the hole diameter and tongue angle, the gas holdups and gas cap height below the perforated plate increase. The addition of the perforated plate enhances the flow behaviour of gas-liquid in bubble column. The CFD can then aid the prediction of gas cap height and gas holdup in a multi-stage bubble column.

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Theoretical and experimental investigation on the characteristics of fly‐ash scrubbing in a fixed valve tray column

2012

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in Wiley Online Library (wileyonlinelibrary.com).The goal of this study is to evaluate the performance of a fixed valve tray column designed to remove fly-ash particles. A series of experiments were carried out at room temperature to demonstrate the collection efficiency of a fixed valve tray column at different gas and liquid superficial velocities. The fly-ash particles removal characteristics of the fixed valve tray column were evaluated by measuring variations of concentration and size distribution of particles in the outlet. The mechanism of particle removal in this turbulent dispersion system was theoretically analyzed on the basis of diffusion, interception, sedimentation and impaction, and a model was proposed to predict the collection efficiency. 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 bubble hydrodynamics, system property, and operation conditions on the collection efficiency. The model is expected to guide effectively the design and operation of valve tray washing columns, which is widely applied nowadays.

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Gas holdup in a trayed cold-flow bubble column

Cited by 23 publications

References 3 publications

Effect of internals and sparger design on mixing behavior in sectionalized bubble column

Effect of internals and sparger design on mixing behavior in sectionalized bubble column

Parameters measurement of hydrodynamics and CFD simulation in multi‐stage bubble columns

Theoretical and experimental investigation on the characteristics of fly‐ash scrubbing in a fixed valve tray column

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