Gas flow distribution in conical‐base spouted beds

Rovero, Giorgio; Brereton, Clive; Epstein, Norman; Grace, John R.; Casalegno, L.; Piccinini, N.

doi:10.1002/cjce.5450610306

Cited by 43 publications

(34 citation statements)

References 12 publications

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“…The experimental results for both nozzles are In all cases, a minimum is achieved at z≈100 mm, i.e., at the cone-cylinder junction, in accord with the results of Rovero et al (1983). At a given bed level, the pressure gradient decreases as U/U ms increases, presumably because the voidage in the annulus increases somewhat with U/U ms (He et al, 2000).…”

Section: Maximum Spoutable Bed Heightsupporting

confidence: 83%

Hydrodynamic Characteristics of a Powder‐Particle Spouted Bed with Powder Entrained in Spouting Gas

et al. 2005

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T he spouted bed technique has proved to be an effective means of contacting relatively coarse particles with a gas (Epstein and Grace, 1997). Spouted beds differ in geometrical confi guration and, for continuous solids feed, in method of feeding the solids. The most conventional and common confi gurations are either conical or cylindrical with a conical base, the function of the cone in the latter being to prevent the occurrence of stagnant solids at the base. Solids feeding methods include gravity feed to the top of the bed, pneumatic conveying by the spouting gas entering the inlet nozzle at the bottom of the bed, and suction feed whereby particles are fed into the bed sideways near the gas inlet using the suction created by the gas jet entering the bed. Fane et al. (1985) were the fi rst to publish on the behaviour of a spouted bed in which the entering gas stream carried the same solids as those being spouted. In their study, the conicalcylindrical bed was connected to a long vertical riser at the bottom. The particles were fed into the riser via a vibratory feeder that allowed independent control of solids and air fl ow rate. They reported that the maximum spoutable bed height, H m , increased with the total solids loading of the entering gas, and their data also showed a decline of minimum spouting velocity, U ms , with increased loading. These results are in accord with

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Section: Maximum Spoutable Bed Heightsupporting

confidence: 83%

Hydrodynamic Characteristics of a Powder‐Particle Spouted Bed with Powder Entrained in Spouting Gas

et al. 2005

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“…column. Except near the entrance of the column where the 1977; Rovero et at., 1983). Since voidages in the annulus of a spouted bed have been found to be higher than the corresponding loose-packed voidages, calibration curves corresponding to higher voidages are required.…”

Section: Pressure Drop Versus Velocity Relationshipsmentioning

confidence: 96%

Pressure gradients, voidage and gas flow in the annulus of spouted beds

Lim

Grace

2000

Can J Chem Eng

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Parallel measurements of pressure gradients with a differential pressure probe and voidage profiles with a fibre optic system have been carried out to study gas flow distributions in the annulus of spouted beds. The observation of Grbavcic et al. (1976) that for a given fluid‐solid combination and column geometry the annulus pressure gradient at any bed level is independent of bed depth was corroborated again. Calibration curves of pressure drops versus superficial gas velocities for beds of voidage higher than the loose‐packed voidage were obtained by applying the Ergun (1952) equation, making it possible to estimate superficial gas velocities in the annulus using the static pressure gradient method. The local superficial gas velocity in the annulus was found to be higher in a deep bed than in a shallow bed of the same material, contrary to the conclusion (Grbavcic et al., 1976) that, for a given fluid‐solid combination and column geometry, the annulus fluid velocity at any level is independent of bed depth. Theoretical models and equations which do not account for the conical geometry near the bottom were found to underpredict superficial gas velocities in the annulus. Increasing the spouting gas flow was found to increase the net gas flow through the annulus.

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“…H/D c = 2-4) the minimum spouting velocity for any particular material could accurately be calculated by using Eq. (19). This present paper indicates the different ranges of operation, by which the minimum spouting velocity could be well correlated.…”

Section: Development Of Correlating Equationsmentioning

confidence: 88%

A general correlation for the minimum spouting velocity

Aravinth

Murugesan

1997

Bioprocess Engineering

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In this paper new correlations are developed, for cases where the height of the bed to column diameter ratio (H/D c ) is below and above unity. Based on 356 published data points (16 different sources with 23 different solids with a wide range of variables) along with those of the author are used for developing the correlations. The present proposed equations are more exact and simpler to use than previous empirical correlation.

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Gas flow distribution in conical‐base spouted beds

Cited by 43 publications

References 12 publications

Hydrodynamic Characteristics of a Powder‐Particle Spouted Bed with Powder Entrained in Spouting Gas

Hydrodynamic Characteristics of a Powder‐Particle Spouted Bed with Powder Entrained in Spouting Gas

Pressure gradients, voidage and gas flow in the annulus of spouted beds

A general correlation for the minimum spouting velocity

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