Relation of mechanical power to gas holdup and mass transfer in an agitated vessel

Benadda, Belkacem; Ismaili, Samir; Otterbein, M.

doi:10.1002/ceat.270200306

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…Under these experimental conditions, previous studies [11] considered the reaction as first order with respect to oxygen, first order with respect to cobalt, and zeroth order with respect to sulfite, provided that the sum of sulfate and sulfite concentrations is maintained constant.…”

Section: Interfacial Area (A)mentioning

confidence: 99%

Hydrodynamics, Mass Transfer and Gas Scrubbing in a Co-current Droplet Column Operating at High Gas Velocities

Kies

Benadda

Otterbein

2006

Chem. Eng. Technol.

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The main objective of this work was to propose a new process for household fume incineration treatment: the droplet column. A feature of this upward gasliquid reactor which makes it original, is to use high superficial gas velocities (13 m s -1 ) which allow acid gas scrubbing at low energy costs. Tests were conducted to characterize the hydrodynamics, mass transfer performances, and acid gas scrubbing under various conditions of superficial gas velocity (from 10.0 to 12.0 m s ). The following parameters characterized the hydrodynamics: pressure drops, liquid hold-ups, and liquid residence time distribution were identified and investigated with respect to flow conditions. To characterize mass transfer in the droplet column, three parameters were determined: the gas-liquid interfacial area (a), the liquid-phase volumetric mass transfer coefficient (k L a) and the gas-phase volumetric mass transfer coefficient (k G a). Gas absorption with chemical reaction methods were applied to evaluate a and k G a, while a physical absorption method was used to estimate k L a. The influence of the gas and liquid velocities on a, k L a, and k G a were investigated. Furthermore, tests were conducted to examine the utility of the droplet column for the acid gas scrubbing, of gases like hydrogen chloride (HCl) and sulfur dioxide (SO 2 ). This is a process of high efficiency and the amount of pollutants in the cleaned air is always much lower than the regulatory European standards imposed on household waste incinerators.

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Section: Interfacial Area (A)mentioning

confidence: 99%

Hydrodynamics, Mass Transfer and Gas Scrubbing in a Co-current Droplet Column Operating at High Gas Velocities

Kies

Benadda

Otterbein

2006

Chem. Eng. Technol.

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“…[15] It may be caused by the inconsistency of the self-inducing impeller in this work and that in the literature. It has been found by many researchers [39][40][41] that the impeller pumping capacity decreases, viz., power consumption reduces with increasing of the gas inlet flow rate. Obviously, it can be observed from Figure 10 that the impeller clearance has a significant effect on gas dispersion.…”

Section: Effect Of Impeller Speed On Gas Dispersionmentioning

confidence: 99%

CFD simulation of hydrodynamics characteristics in a tank stirred by a hollow self‐inducing impeller

Chen²,

Ke-feng

et al. 2018

Can J Chem Eng

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Hollow self-inducing impellers are often used in gas-liquid stirred tanks in many industrial processes. To understand the hydrodynamics characteristics of this type of stirred tank under aerated and unaerated conditions, a computational fluid dynamics (CFD) simulation study was conducted. The predicted gas self-inducing flow rate, power consumption, and impeller power number were compared with the experimental data in the literature and discussed. Under unaerated conditions, liquid level in the hollow shaft relies on the impeller speed, and is slightly influenced by the impeller clearance. Self-inducing impeller power number remains almost unchanged with impeller speed, while increasing with the rise of the impeller clearance. Under aerated conditions, gas is easy to accumulate in the centre of the upper and lower circulation loops. Gas self-inducing flow rate, global gas holdup, and power consumption increase with higher impeller speed. The critical impeller speed for gas self-induction decreases with higher impeller clearance. At the same impeller speed, gas self-inducing flow rate and global gas holdup increase, while power consumption reduces with increasing of impeller clearance.

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Bioreactor scale-up and oxygen transfer rate in microbial processes: An overview

Garcı́a-Ochoa

Gómez

2009

Biotechnology Advances

1,176

760

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Relation of mechanical power to gas holdup and mass transfer in an agitated vessel

Cited by 4 publications

References 9 publications

Hydrodynamics, Mass Transfer and Gas Scrubbing in a Co-current Droplet Column Operating at High Gas Velocities

Hydrodynamics, Mass Transfer and Gas Scrubbing in a Co-current Droplet Column Operating at High Gas Velocities

CFD simulation of hydrodynamics characteristics in a tank stirred by a hollow self‐inducing impeller

Bioreactor scale-up and oxygen transfer rate in microbial processes: An overview

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