Abstract
In this study, velocimetry and statistical analyses were conducted on a swirling fluidized bed. A bed of spherical particles (4 mm) was fluidized by using an annular distributor covered with mesh. The angles of rectangular blades in the distributor were set at 30°, 45°, 60°, 75° and 90°, and the cell size of the mesh cover was 2.5 × 2.5 mm2. The weight was varied from 500 to 1250 g and the effect of each variable on bed velocity response was quantified through velocimetry and statistical analysis. The statistical analysis was conducted using NCSS statistical software. The blade angle, bed weight and superficial velocity for 4 mm particles were statistically optimized at 750 g, 58.26° and 1.45 m/s, respectively. On the experimental side, these parameters have been optimized at 750 g, 60° and 1.41 m/s, respectively. A small difference of 1.74° was noticed in experimental and statistical predictions for the blade angle. The bed weights and superficial velocities were found to be same in both cases. The confidence interval (95%) for bed velocity was proposed in the range of 0.513 to 0.519 m/s. The experimentally optimized bed velocity remained within the proposed range. The well-agreeing results indicate good practical value of distributor design and high precision of the experimental measurements.
Highlights
Though fluidized beds are in use in many industries, the stable regime of fluidization is lacking in many traditional fluidized beds [1]
This study elaborated on the bed dynamics of a swirling fluidized bed (SFB) both experimentally and statistically by
This study elaborated on the bed dynamics of a SFB both experimentally and statistically by measuring the velocity profiles of particles along the radial lines in the fluidized bed
Summary
Though fluidized beds are in use in many industries, the stable regime of fluidization is lacking in many traditional fluidized beds [1]. Uniform fluidization of the materials under processing is needed in almost all practical applications of fluidized beds. The swirling fluidized bed (SFB) is the refined form of a conventional fluidized bed. SFBs can be used to perform industrial-scale processing of nano to micro-sized materials. The most reported SFBs are operated with different variants of air distribution plates. The workings, applications and efficiency of a SFB depend on distributor design
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