Slurry Drying in Gas-Particle Contactors: Fluid-Dynamics and Capacity Analysis

Reyes, Antonio; Díaz, Georgina; Blasco, R.

doi:10.1080/07373939808917400

Drying Technology

1998

DOI: 10.1080/07373939808917400

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Slurry Drying in Gas-Particle Contactors: Fluid-Dynamics and Capacity Analysis

Antonio Reyes

Georgina Díaz

R. Blasco

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Cited by 17 publications

References 3 publications

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Measurements of local flow structures of conical spouted beds by optical fibre probes

Wang¹,

Bi²,

Lim³

2009

Can J Chem Eng

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A new calibration set-up was designed and assembled, and a comprehensive sensitivity analysis was conducted to investigate factors that may affect the calibration of the effective distance of an optical fibre particle velocity probe. It is shown that the glass window has the most significant impact on the calibration result. The optical fibre probe was then applied to measure local particle velocities and solid fractions inside a half and a full circular conical spouted bed. It is found that the overall particle velocity profiles, as well as the shapes of the spout and fountain are quite similar in both columns.Un nouveau réglage d'étalonnage aété conçu et assemblé, et une analyse de sensibilité complète aété effectuée afin d'investiguer les facteurs risquant d'avoir un impact sur l'étalonnage de la distance réelle d'une sondeà fibres optiques de la vitesse des particules. Il aété démontré que la fenêtre de vitre a l'impact le plus important sur les résultats de l'étalonnage.La sondeà fibres optiques a par la suiteété utilisée pour mesurer les vitesses locales des particules et des fractions de solideà l'intérieur d'un demi et d'un plein lit jaillissant conique circulaire. Il est démontré que l'ensemble des profils de vitesse des particules, ainsi que la forme du bec et de la fontaine sont très semblables dans les deux colonnes.

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Measurements of local flow structures of conical spouted beds by optical fibre probes

Wang¹,

Bi²,

Lim³

2009

Can J Chem Eng

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Analysis of pressure fluctuations during water evaporation in spouted bed

et al. 2009

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The aim of this work was to study the behaviour of conventional spouted beds during water evaporation and to analyze the pressure fluctuations at the maximum water evaporative capacity for different bed heights and air flow rates. The results showed that spout pressure drop could not indicate the proximity of maximum evaporative capacity; however this condition is denoted by a minimum in fountain height. The standard deviation and amplitude of the pressure fluctuations also showed a minimum point at the maximum water evaporation capacity. The frequency domain analysis of pressure fluctuations revealed that the dry bed has a dominant frequency varying from 6 to 8.2 Hz and that the peak of dominant frequency tends to disappear with the increase in water feed rate.

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Residence time distribution in spouted bed drying of maltodextrin solutions on a bed of inert particles

et al. 2011

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Residence time distributions (RTD) for aqueous maltodextrin solutions were determined in two kinds of spouted bed dryers: (1) conventional spouted bed (CSB) 0.305 m diameter with a bed of polypropylene beads and (2) spout-fluid bed 0.143 m diameter with draft tube submerged in a bed of FEP ® pellets (S-FBDT). RTD, mean residence time t m , and spread of the distribution 2 , were determined at different drying temperatures, spouting velocities, bed depths, spraying pressures, and feed concentrations. Average values of t m and 2 were 6.5 min and 26.6 min 2 for the CSB and 6.9 min and 36 min 2 for the S-FBDT, respectively, for all operating conditions except spraying pressure. RTD curves were well represented by the response of an ideal stirred tank with a superimposed bypass of 15% on average for the CSB and 7% on average for the S-FBDT dryer for all operating conditions. Increase in spraying pressure produced a reduction of t m and an increase in the bypass fraction of the product in both dryers.

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Slurry Drying in Gas-Particle Contactors: Fluid-Dynamics and Capacity Analysis

Cited by 17 publications

References 3 publications

Measurements of local flow structures of conical spouted beds by optical fibre probes

Measurements of local flow structures of conical spouted beds by optical fibre probes

Analysis of pressure fluctuations during water evaporation in spouted bed

Residence time distribution in spouted bed drying of maltodextrin solutions on a bed of inert particles

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