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By Wen-Ching Yang

This quantity, Fluidization, Solids dealing with, and Processing, is the 1st of a chain of volumes on "Particle Technology". debris are vital items of chemical procedure industries spanning the elemental and forte chemical compounds, 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 creation, it is also utilized in coal gasification and combustion for energy new release, mineral processing, meals processing, soil washing and different comparable waste remedy, environmental remediation, and source restoration approaches. The FCC (Fluid Catalytic Cracking) know-how ordinarily hired within the smooth petroleum refineries can also be in accordance with fluidization ideas.

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Extra resources for Fluidization, Solids Handling, and Processing

Sample text

By use of isotropic material with common roughness levels, these last two parameters can be overlooked. Using Eq. (34), the set of independent dimensionless parameters (Eq. 30) becomes, Eq. (36) 2 2 u o2 , ρ s , ρs u o d p ϕ , ρf u o L , G s , µL µ gL ρ f ρs u o L , Bed geometry, ϕ , particle size distribution (PSD) D These can be rearranged by combination of parameters. It must be borne in mind that such manipulation by itself does not lead to any decrease in the number of dimensionless parameters.

24) υ normal = 0 at y = 0 Eq. (25) Eq. (26) υ normal = Gs 1 ρ s uo 1 − ε at x = 0 , D L u′ = 0 Fluidized Bed Scale-up 35 at y = 0 Eq. (27) u ′ = i/∆ above distribution holes u ′ = 0 elsewhere At all internal surfaces x′s , y′s Eq. (28) u ′= 0 , υ ′N = 0 Eq. (29) ( at y′ = 0, P′= Po ρ f u o2 ) 2 The term Po ρ f u o can be ignored when the fluid velocity is small compared to sonic velocity or the absolute pressure does not change enough to influence the thermodynamic properties of the fluid; it will be ignored in this development.

A typical operating condition for most commercial gas solid beds is well beyond the point of minimum bubbling. It might be expected that 24-Sep-2001 JMR Fluidized Bed Scale-up 31 electrostatic or van der Waals forces are not as important as they are near the point of minimum fluidization. It is likely that particle-particle collisions, dependent on the coefficient of restitution and sliding friction, come into play at much higher uo /umf . Litka and Glicksman (1985) carried out systematic experiments to determine the importance of particle mechanical properties on the behavior of bubbling beds.

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