Abstract
AbstractHydrodynamics of conical fluidized bed differ from that of columnar beds by the fact that a velocity gradient exists along the axial direction of the bed. The gas–liquid–solid fluidized bed has emerged in recent years as one of the most promising devices for three-phase operations. Such a device is of considerable industrial importance as evident from its wide applications in chemical, refining, petrochemical, biochemical processing, pharmaceutical, and food industries. To explore this, experiments have been carried out to find the bed pressure drop, bed fluctuation, and expansion ratios for ternary mixtures of dolomite in a three-phase conical fluidized bed. The effect of superficial liquid and gas velocity, initial static bed height, average particle size, and cone angle on the above-mentioned three responses have been studied. Mathematical models have been developed for the responses using both dimensional and statistical analyses. The calculated values of the responses from the developed model...
Highlights
With the development of fluidized bed coal combustion and the recent interest in the use of such beds for waste utilization and dry solids separation, potential applications of multi-component fluidized beds are on the rise
Peng and Fan(1997)made an in-depth study of hydrodynamic characteristics of solid–liquid fluidization in a tapered bed and derived theoretical models for the prediction of minimum fluidization velocity and maximum pressure drop, based on the dynamic balance of forces exerted on the particle
In this study by the use of a secondary fluidizing medium beyond minimum fluidization the bed pressure drop can be significantly reduced. The study of both dimensional analysis and RSM-based central composite design (CCD) and quadratic programming are used to model the influence of four process parameters on the three responses
Summary
With the development of fluidized bed coal combustion and the recent interest in the use of such beds for waste utilization and dry solids separation, potential applications of multi-component fluidized beds are on the rise. Biswal, Sahu, and Roy (1982), Biswal, Samal, and Roy (1984), Biswal, Bhowmik and Roy (1984, 1985) developed theoretical models for minimum fluidization velocity and bed pressure drop for spherical particles for gas–solid systems in conical vessels. Peng and Fan(1997)made an in-depth study of hydrodynamic characteristics of solid–liquid fluidization in a tapered bed and derived theoretical models for the prediction of minimum fluidization velocity and maximum pressure drop, based on the dynamic balance of forces exerted on the particle. Jing, Hu, Wang, and Jin (2000) and Shan et al (2001) proposed models for ΔPmf and Umf for gas–solid conical fluidized beds for spherical coarse and fine particles based on Peng and Fan (1997) models, but neglected pressure drop due to the kinetic change in the bed The experiments were carried out for spherical particles only. Jing, Hu, Wang, and Jin (2000) and Shan et al (2001) proposed models for ΔPmf and Umf for gas–solid conical fluidized beds for spherical coarse and fine particles based on Peng and Fan (1997) models, but neglected pressure drop due to the kinetic change in the bed
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