Scale‐up examination of spouted bed dryers

Németh, J.; Pallai, E.; Aradi, E.

doi:10.1002/cjce.5450610324

Cited by 20 publications

(9 citation statements)

References 4 publications

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“…Five type T thermocouples were used to measure temperature. One was used to measure the temperature of the inlet air, another to measure the temperature of the outlet air and three to measure the temperature in three different positions located axially from the circular region (0.12, 0.20 and 0.24 m from the beginning of the conical base).…”

Section: Methodsmentioning

confidence: 99%

“…Although it is a simple process, various limitations preclude its application to industrial use, mainly because the quantity of air required to keep the spout stable is greater than that used in the drying process itself. The operating ranges and the increase in scale are directly related to this fact . Besides, there are also the limits related to the properties of the inert particles, such as: size, shape, density and porosity.…”

Section: Introductionmentioning

confidence: 99%

“…The operating ranges and the increase in scale are directly related to this fact. [6][7][8] Besides, there are also the limits related to the properties of the inert particles, such as: size, shape, density and porosity. However, Freire [1] pointed out that the paste is the great problem of the process and it may be a likely source of instability.…”

Section: Introductionmentioning

confidence: 99%

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Neuronal and grey modelling of milk drying in spouted bed

Nascimento

Freire

2013

Can J Chem Eng

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The chemical composition of pastes is one of the factors responsible for the behaviour of the paste during the drying process in spouted bed. Therefore, the aim of this study was to analyse the drying process of paste in spouted bed for four types of milk: whole, skimmed, semi‐skimmed and low lactose content milk, which have different concentrations of sugar and fat. A neuronal model was proposed in order to describe the influence of the presence of pastes on the spouted bed fluid dynamics. The change of moisture content of the powder during the drying process and of the heat and mass transfer phenomena were estimated using a hybrid model based on the global balance of mass and energy and a phase‐coupling term given by a neural network.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neuronal and grey modelling of milk drying in spouted bed

Nascimento

Freire

2013

Can J Chem Eng

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“…In this context, the mechanically stirred spouted beds have appeared as promising alternatives to overcome the conventional spouted bed limitations. According to the first mechanical spouted bed prototypes developed, which are a patent from the 1970s is mentioned elsewhere, − the typical spouting motion is provided by an open conveyor screw placed along the vertical axis of the equipment rather than by the air flow rate. , As this configuration maintains the most important advantages of conventional spouted beds, several researchers have investigated the mechanical spouted bed as well as the mechanically agitated fluidized beds, different stirrer devices, and different configurations in such equipment. Pallai-Varsányi et al have evaluated the application of the mechanical spouted bed in the drying of suspensions and solutions on inert particle surfaces.…”

Section: Introductionmentioning

confidence: 99%

Fluid Dynamic Analysis of a Modified Mechanical Stirring Spouted Bed: Effect of Particle Properties and Stirring Rotation

AzevedoBarros

Brito

Freire

et al. 2020

Ind. Eng. Chem. Res.

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The purpose of this study is to perform the fluid dynamic analysis of a modified mechanical stirring spouted bed, which has been proposed as a promising alternative to the conventional spouted bed. Thus, a comparison is also performed between the dynamic behaviors of such equipment. The addition of the stirrer to the spouted bed enhanced the movement of particles in the bed. The mechanical stirring spouted bed presented better performance than the conventional configuration at stirrer rotations above 90 rpm. Small particles were less susceptible to the effect of stirrer rotation than large particles, demanding a higher rotation to provide a lower minimum air flow rate. The proposed model provided good predictions in terms of maximum pressure drop and minimum air velocity in the modified mechanical stirring spouted bed. The findings of this study contribute to the development of versatile and promising equipment for different processes and operations, providing the key parameters for an appropriate design.

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“…In the past, extensive experiments have been carried out to explore the distribution properties of gas–solid phases in the spouted bed . Valuable information on the bed hydrodynamics has been obtained with lots of useful empirical correlations proposed for the design and the scale‐up of the units.…”

Section: Introductionmentioning

confidence: 99%

CFD‐DEM simulation of the spout–annulus interaction in a 3D spouted bed with a conical base

et al. 2013

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Numerical simulation of the gas–solid flow in a three‐dimensionally spouted bed with a conical base is conducted on the base of the CFD–DEM coupling approach. The gas phase is tracked at the computational grid level, while the solid motion is resolved at the particle scale level. The comparison is taken between the calculated results and the experimental data in literature. Hydrodynamics and spout–annulus interaction in the bed are investigated. The results demonstrate that the gas flow in the cylindrical region of the bed shows self‐similarity property. Solid vertical velocity in the central region increases initially and then decreases with bed elevation. The vertical solid transporting intensity is dramatically larger than the lateral one. Furthermore, the spout diameter exhibits a diverging tendency along the axial direction. Spout–annulus interaction intensity can be quantitatively described with solid flux exchanging from the spout boundary. Moreover, the interaction intensity through the spout–annulus interface increases initially, and then diminishes along the axial direction. Besides, the spout diameter and the spout–annulus interaction intensity are enlarged by increasing the spouting velocity.

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Scale‐up examination of spouted bed dryers

Abstract: Comparison of experimental results with predictions of the main hydrodynamic characteristics used for the sizing of spouted bed dryers are made. Various new equipment constructions are demonstrated together with operating experiences, both with an emphasis on scale‐up.

Cited by 20 publications

References 4 publications

Neuronal and grey modelling of milk drying in spouted bed

Neuronal and grey modelling of milk drying in spouted bed

Fluid Dynamic Analysis of a Modified Mechanical Stirring Spouted Bed: Effect of Particle Properties and Stirring Rotation

CFD‐DEM simulation of the spout–annulus interaction in a 3D spouted bed with a conical base

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