Experimental Analysis of the Fluidization Process of Binary Mixtures                    of Solids

Formisani, Brunello; Girimonte, Rossella

doi:10.14356/kona.2003010

Cited by 28 publications

(13 citation statements)

References 13 publications

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“…The reduction of the final fluidization velocity is another essential part of the optimization, which will be evaluated in this section. It represents the velocity at which the bed in transition remains completely fluidized [15,24].…”

Section: Uff Behaviormentioning

confidence: 99%

Study of The Biomass, Sand, and Biochar Fluidization in A Typical Bed of Fast Pyrolysis

Vasconcelos

Júnior

Simonelli

et al. 2021

Preprint

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Biomass pyrolysis usually occurs in a fluidized bed reactor formed by sand, biomass, and biochar. Dynamics this fluidization differs from that of literature because the biomass is converted continually in biochar. In this study, a series of experiments have been carried out for ternary mixtures of sand, sisal residue, and biochar, varying the compositions and particle size. The tests were based on two simplification hypotheses (steady state and room temperature) due to fast biomass transformation in bed and low Van der Waals force to large particles. The dynamic characteristics determined included the bed pressure drop and bed fluctuation. The single and combined effects of particle size and composition on the final fluidization velocity (Uff) and particle segregation (S) have been analyzed using response surface (RSM). The Uff and S minimum values were found when the variables were in the smallest particle size and composition levels. New correlations were developed for predicting the values of Uff. The error from measured values when using the new correlation was 7.6%, while the literature equation was 9.7%. The present correlations predicted reasonably well predicted the Uff of ternary mixtures in the fast pyrolysis bed.

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Section: Uff Behaviormentioning

confidence: 99%

Study of The Biomass, Sand, and Biochar Fluidization in A Typical Bed of Fast Pyrolysis

Vasconcelos

Júnior

Simonelli

et al. 2021

Preprint

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“…In the previous section, we have shown various ways in which the presence of dead zones within a fluidised bed may be reduced by varying the size, number and/or distribution of orifices belonging to the system's distributor. However, an absence of dead zones does not necessarily equate to a well-mixed systemit is well known that even a fully-fluidised bed may produce significant segregation between large/light and small/dense particles in a binary system [1,[34][35][36]. In this section, we attempt to assess quantitatively the degree to which each of our distributors provides a homogeneous distribution of larger particles throughout our system.…”

Section: Particle Distributionmentioning

confidence: 99%

“…Examples include combustion and gasification, powder granulation, polymerisation, spray coating and atomic layer deposition [1][2][3]. For many of these processes, their effectiveness strongly depends on the ability of the fluidised-bed systems to mix, recirculate and uniformly distribute materials [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of distributor design on particle distribution in a binary fluidised bed

et al. 2020

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“…Norouzia et al [3] suggested that increasing the superficial gas velocity caused rigorous internal and gross circulations, which in return, improved solids mixing and decreased deviations from well mixed state. Formisani and R. Girimonte [4] found that the binary fluidization of a mixture occured within a characteristic velocity range whose boundaries coincide with the "initial" and the "final fluidization velocity" of the particle mixture. Jinsen Gao et al [5] found that segregation efficiency increases with increasing gas velocity and mean residence time of the binary particles, but decreases with increase in small particle concentration.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and Particle Mixing Characteristics of a Ternary Mixture in a Gas-Solid Fluidized Bed

J*¹,

Saravana²

2019

IJRTE

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Gas-Solid Fluidized Beds are widely used in current industrial practices for their high efficiency in producing products of very high standards. The study of bed dynamics has become an important concern for the design of fluidized beds. Various parameters like pressure, temperature, gas velocity, mean residence time and solids composition affect the bed behavior. In this view, an experimental study was carried out to determine the influence of gas flow rate, mixing time, solids composition and bed height on mixing/segregation behaviour of the bed of particles. Since fluidized beds involving more than two solids are more frequently encountered in current industrial practices, the experiments were conducted using three solid sand particles of average sizes 231 μm, 335 μm, and 510 μm. Various mixing patterns were observed for different mixing times (10, 20 and 30 minutes), different gas flow rates (7.5, 12.5, 17.5, 22.5 and 27.5 LPM), and different solids ratio. Good mixing occurred at an optimum mixing time of 30 minutes and gas flow rates of 17.5 LPM and 22.5 LPM at all solids ratio. The components exhibited relatively better mixing at intermediate bed heights.

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Experimental Analysis of the Fluidization Process of Binary Mixtures of Solids

Abstract: The simultaneous treatment of dissimilar solids is encountered in a number of processes that exploit f luidization technology (granulation, combustion, pyrolysis, etc.)

Cited by 28 publications

References 13 publications

Study of The Biomass, Sand, and Biochar Fluidization in A Typical Bed of Fast Pyrolysis

Study of The Biomass, Sand, and Biochar Fluidization in A Typical Bed of Fast Pyrolysis

Effect of distributor design on particle distribution in a binary fluidised bed

Hydrodynamics and Particle Mixing Characteristics of a Ternary Mixture in a Gas-Solid Fluidized Bed

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