Experimental Study on the Dynamics of a Spouted Bed With Particle Feed Through the Base

Freitas, Luís Alexandre Pedro de; Freire, José Teixeira

doi:10.1590/s0104-66321997000300012

Cited by 11 publications

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“…This table also brings the main hydrodynamic characteristics of the SBs studied, like maximum spoutable bed height (H max ), minimum spouting velocities of dry bed (V ms ), and the MWEC. The maximum spoutable bed height and minimum spouting air velocities were determined by the methods elsewhere (Freitas and Freire, 1997). The visual observations of spout termination, increase in spout instabilities or water flooding of the bed with the increase in water feed rate were considered for the determination of MWEC.…”

Section: Equipmentmentioning

confidence: 99%

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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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Section: Equipmentmentioning

confidence: 99%

“…The maximum SB height and the minimum spouting velocities were determined by classical methods (Freitas and Freire, 1997) and several experiments were carried out to define the criteria for the MWEC. The results of the hydrodynamic and evaporation capacities are shown in Table 1.…”

Section: Maximum Water Evaporation Capacitymentioning

confidence: 99%

Analysis of pressure fluctuations during water evaporation in spouted bed

et al. 2009

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“…The experimental results show that a significant improvement of the FGD efficiency can be achieved by an increase in relative humidity. The dynamics of the spouted bed filled with particles were researched by Freitas and Freire through experimentation. They determined the velocity of particle and the rate of recirculation in the bed, and analyzed the influence of different operating parameters on spouted bed dynamics.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis of a Water Vaporization Process in a Three-Dimensional Spouted Bed for Flue Gas Desulfurization

Hui

et al. 2021

ACS Omega

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In this work, the gas−solid flow and water vaporization process are simulated by the method of Euler−Eulerian two-fluid model in a three-dimensional spouted bed, which have a significant influence on the desulfurization efficiency. The results of simulation indicate that the change trends of the particle volume fraction are similar under superficial gas velocities of 0.7 and 0.8 m/s. The degree of particle pulsation is the highest at the bottom of the spout area, and the degree of gas pulsation is the highest at the junction of the annulus area and spout area. The temperatures of gas, liquid, and particles are also analyzed. The results demonstrate that in the spout area, the gas temperature is much higher than that of the liquid and particles, but the three phases are uniformly mixed and have similar temperatures in other areas. Moreover, water vaporization mainly occurs at the junction of the annulus area and the spout area, a small amount of liquid is vaporized at the center of the spout area, and basically no vaporization reaction occurs in the outer radius of the annulus area. With the increase in gas velocity, gas temperature, and liquid temperature and the decrease in gas humidity, water vaporization reaction is promoted.

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“…Spouted beds are frequently adopted as efficient fluid‐particle contactors in industrial processes because they provide good mixing and circulation patterns when beds made up of large and irregular particles are used , such as for granulation, drying, polymerizations, black liquor, pyrolysis, nuclear fuel coating, and gasification due to its high gas‐solid contacting efficiency and the ability to operate the particles with relatively large size and irregular shape . In order to achieve a more effective usage of cylindrical spouted beds in industrial applications, numerous experimental studies were performed to obtain detailed knowledge of gas and particle hydrodynamics . Numerical simulation methods and computational fluid dynamics have become popular in the field of gas‐solid two‐phase flow.…”

Section: Introductionmentioning

confidence: 99%

“…Ichikawa et al used particulate design and preparation to control drug release thermosensitively or in a delayed mode from microcapsules that were prepared by coating with a membrane incorporating hydrogel as a particulate or chemical component. Freitas et al experimentally investigated the dynamics of a spouted bed with particle feed through the base. Olazar et al experimentally studied the feasibility of the thermal processing at low temperature of straw black liquor in fluidized and spouted beds.…”

Section: Introductionmentioning

confidence: 99%

Influence of Longitudinal Vortex Generator Configuration on the Hydrodynamics in a Novel Spouted Bed

Huang

Zhang

et al. 2018

Chem Eng & Technol

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The gas-solid flow in a cylindrical spouted bed with a pair of spherical longitudinal vortex generators (LVGs) was numerically investigated by a two-fluid model with kinetic theory for granular flow. Simulations and analyses were conducted on five types of spouted beds: a conventional spouted bed without disturbance units as well as spouted beds with a pair of LVGs in which the radius of spheres installed on the LVGs had four different dimensions. Results of the computational fluid dynamics demonstrate that the fountain height decreases with larger radius, and the influence range of the longitudinal vortex increases with the greater radius, both for the gas phase and particle phase. The turbulent kinetic energy of the gas phase along the radial and axial directions in the spouted bed was also promoted significantly by the longitudinal vortex and increased with larger radius, which is due to the higher LVG volume.

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Experimental Study on the Dynamics of a Spouted Bed With Particle Feed Through the Base

Cited by 11 publications

References 0 publications

Analysis of pressure fluctuations during water evaporation in spouted bed

Analysis of pressure fluctuations during water evaporation in spouted bed

CFD Analysis of a Water Vaporization Process in a Three-Dimensional Spouted Bed for Flue Gas Desulfurization

Influence of Longitudinal Vortex Generator Configuration on the Hydrodynamics in a Novel Spouted Bed

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