Flow regimes in wet conical spouted beds using glass bead mixtures

Bacelos, Marcelo Silveira; Freire, José Teixeira

doi:10.1016/j.partic.2008.01.001

Cited by 15 publications

(4 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For particles of the same density, lighter particles tend to disperse more in the radial direction. On the other hand, heavier particles reach lower fountain heights and travel shorter radial distances onto the annulus as compared to lighter particles [12,17]. Consequently, this reduces the cycle time of heavier particles in a conical column when associated with lighter particles.…”

Section: Introductionmentioning

confidence: 99%

Assessment of air-sand-biomass flow and particle segregation in a conical spouted bed using CFD

Araújo

Faria

Bacelos

et al. 2023

Preprint

View full text Add to dashboard Cite

Biomass pyrolysis is a promising technology used to obtain important industrial chemicals or to produce renewable energy. For pyrolysis reaction, conical spouted beds (CSBs) can be used because of the high heat and mass transfer rates. On the other hand, for CSB either the fluid dynamics stability or particle segregation may limit its usage as a reactor. As a contribution to the application of CSB reactors for biomass pyrolysis, this research aims not only to test Euler-Euler models to predict segregation in CSBs composed of binary mixtures with different particle shapes and densities but also present experimental verification. The computational fluid dynamic (CFD) designs are carried out using the Euler granular model. The results reveal that the CFD simulation using Gidaspow's drag and dispersed k-ε turbulence models can better represent the experimental pressure drop and axial biomass particle concentration in the bed.

show abstract

Section: Introductionmentioning

confidence: 99%

Assessment of air-sand-biomass flow and particle segregation in a conical spouted bed using CFD

Araújo

Faria

Bacelos

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Spouted bed is gas-solid contactor in which the gas is introduced through a single orifice from the centre of a flat base, instead of a multiorifice system, resulting in a systematic cyclic pattern of solid movement inside the bed [2] as shown in Figure 1. A spouted bed has three different regions: the annulus, the spout, and the fountain [3,4]. At stable spouting process, a spout appears at the centre of bed, a fountain appears above the bed surface and an annulus forms between the spout and wall, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Fluidization and Spouting of Fine Particles: A Comparison

Sahoo

2013

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The fluidization characteristics of fine particles have been studied in both the fluidized bed and spouted bed. The effect of different system parameters (viz. static bed height, particle size, particle density and superficial velocity of the fluidizing medium, rotational speed of stirrer, and spout diameter) on the fluidization characteristics such as bed expansion/fluctuation ratios, bed pressure drop, minimum fluidizing/spouting velocity, and fluidization index of fine particles (around 60 micron particle size) have been analyzed. A stirrer/rod promoter has been used in the bed to improve the bed fluidity for fluidization process and spout diameter has been varied for spouted bed. Mathematical expressions for these bed dynamics have been developed on the basis of dimensionless analysis. Finally calculated values of these bed dynamics are compared with the experimentally observed values thereby indicating the successful applications of these developed correlations over a wide range of parameters.

show abstract

“…sticky, irregular texture or with a wide range of particle size distribution) . Spouted beds have also proven to be especially suitable to avoid defluidisation . In the past 50 years, many valuable experimental and theoretical studies on hydrodynamics of spouted beds have been carried out, which can be seen in detail in Epstein and Grace .…”

Section: Introductionmentioning

confidence: 99%

“…[11] Spouted beds have also proven to be especially suitable to avoid defluidisation. [12,13] In the past 50 years, many valuable experimental and theoretical studies on hydrodynamics of spouted beds have been carried out, which can be seen in detail in Epstein and Grace. [14] In recent years, spouted bed technology has been regarded as an effective method for the thermo-chemical applications of solid waste, which usually have irregular shapes.…”

mentioning

confidence: 99%

Spouting of non‐spherical particles in conical‐cylindrical spouted bed

et al. 2013

View full text Add to dashboard Cite

Experiments on the spouting of non-spherical particles in a conical-cylindrical spouted bed, with an inside diameter of 200 mm and a conical base of 60°, were carried out. The minimum spouting status of six kinds of non-spherical particles, the equi-volume sphere diameter ranges from 1.9 to 6.2 mm and the sphericity ranges from 0.73 to 0.95, were tested and compared with two spherical particles. It was found that the changes of minimum spouting velocity with initial bed height and spout gas inlet diameter were similar to the spouting of spherical particles in conventional spouted beds, while decrease in particle sphericity would lead to an increase in the minimum spouting velocity. The tested minimum spouting velocities were well represented by the MathurÀGishler equation of U ms , however a more satisfied prediction could be achieved for non-spherical particles when replacing d p in MathurÀGishler equation with a modified term w À0.5 d v .

show abstract

Flow regimes in wet conical spouted beds using glass bead mixtures

Cited by 15 publications

References 39 publications

Assessment of air-sand-biomass flow and particle segregation in a conical spouted bed using CFD

Assessment of air-sand-biomass flow and particle segregation in a conical spouted bed using CFD

Fluidization and Spouting of Fine Particles: A Comparison

Spouting of non‐spherical particles in conical‐cylindrical spouted bed

Contact Info

Product

Resources

About