By Wen-Ching Yang
This quantity, Fluidization, Solids dealing with, and Processing, is the 1st of a sequence of volumes on "Particle Technology". debris are very important items of chemical approach industries spanning the fundamental and uniqueness chemical substances, agricultural items, prescription drugs, paints, dyestuffs and pigments, cement, ceramics, and digital fabrics. Solids dealing with and processing applied sciences are therefore necessary to the operation and competitiveness of those industries. Fluidization expertise is hired not just in chemical construction, it is also utilized in coal gasification and combustion for strength new release, mineral processing, nutrition processing, soil washing and different comparable waste therapy, environmental remediation, and source restoration approaches. The FCC (Fluid Catalytic Cracking) expertise typically hired within the glossy petroleum refineries can also be in line with fluidization ideas.
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Extra info for Fluidization, Solids Handling, and Processing
1988 RJxx-.. &~1991 W--- 1992 12MW CfB. dIiI-W. 165MW CfB. d8 -*- 1 1E+1 D. [mJ Figure 19. Empirical correlation and experimental data of thickness of downflowing layer at the wall of a CFB as a function of the equivalent bed diameter. ) The thickness, δ, was found to be insensitive to particle concentration, gas velocity and height within the furnace. That suggests that the thickness results from a balance of solids internal circulation which is generally much higher than net throughflow. If the local solids flux profile, 9-Oct-2001 JMR Fluidized Bed Scale-up 25 as a ratio of the cross sectional average, is roughly invariant over the cross section for these larger beds, the thickness of the wall layer follows from a mass balance.
The equations of motion can either be formulated for individual particles and the surrounding fluid, or the fluid and the particulate phases can each be considered a continuum. Both approaches yield identical results, see Glicksman et al. (1994) for a complete derivation. For our purposes, we will base the derivation on the continuum model formulated by Jackson. 2 29 Governing Equations The use of governing equations has the merit of tying specific dimensionless parameters to particular physical phenomena (Glicksman, 1984, 1988).
Many of the experiments in large beds were considered inconclusive. The compiled data for longitudinal fluid dispersion, ML; gas back mixing, MB; and longitudinal dispersion of solids, Ms are shown in Fig. 16. Note the strong influence of bed diameter on mixing. The scatter in the data was attributed to differences in gas velocity and range of particle sizes. Large differences between small and large bed diameters may be due to flow regime transitions. J. c a . c a O o & § e O O i 00 00 RADIAL MIXIBO E .
Fluidization, Solids Handling, and Processing by Wen-Ching Yang