Identification of Clusters in a Circulating Fluidized Bed of Geldart Group B Particles by Multi-Resolution Analysis
Date Issued
2010
Date
2010
Author(s)
Lin, You-Di
Abstract
Because solid particles accumulated clusters by the chaotic interactions between the void and the solid phases, the gas-solid flow in a circulating fluidized bed (CFB) displayed multi-scales dynamic behaviors. The time-variant features would be neglected by the analytic method using some parameters, eg. the mean and the standard deviation of the solids hold-up signals measured in CFB.
The solids hold-up fluctuation signals of Geldart group B particles (glass bead: particle size=115 μm, density=2462 kg/m3) in the bottom dense region and the splash zone of CFB (0.108 m i.d. and 5.75 m height) were measured by a fiber optic probe in this study. Because the solids hold-up signals displayed multi-scales and time-variant dynamic behaviors, an appropriate level of the approximation subsignal was determined by wavelet analysis based on multi-resolution analysis. By this criterion, the dynamic properties of clusters in the bottom dense region and the splash zone of a circulating fluidized bed were determined. The dynamic properties of clusters of Geldert group A and B particles near the wall in CFB were identified and compared.
Subjects
cluster
fluidized bed
multi-resolution
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-99-R96524055-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):0677ef426306bed8e92cd85d6d474740