By MEL PELL (Eds.)
This booklet is a much-needed fluidization instruction manual for working towards engineers. There are few crops which shouldn't have a fluid mattress method working someplace at the web site, but engineers hardly have any formal education within the topic. collage classes frequently emphasize educational matters instead of business wishes, and a examine of the literature unearths an overpowering abundance of correlations and experimental data.
As it is a sensible ebook, the writer has minimized theoretical improvement of basic equations in desire of giving correlations which were built for giant scale gear. now and again, the place numerous correlations could practice, the writer has selected one or which paintings most sensible in response to his personal adventure. layout techniques are defined which may still support the fashion designer and the operator of fluid beds to enhance his technique and to prevent a few often-encountered pitfalls. the cloth can be invaluable as a supplementary textual content to a direction on fluidization, the emphasis on advertisement layout being a stimulating counterpoint to a strongly educational viewpoint.
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Extra resources for Gas Fluidization
Merry, Penetration of Vertical Jets into Fluidized Beds, AIChEJ 2 1 (1975) 507-510. 7. D. Merry, Penetration of a Horizontal Gas Jet into a Fluidized Bed, Trans. Inst. Chem. Eng. 4 9 (1979) 189-195. 8. A. Zenz, State of the Art Review and Report on Crit ical Aspects and Scale-Up Considerations in the Design of Fluidized Bed Reactors, US Government Report No. DOE/MC/14141-1158, US National Technical Information No. DE82009994, 1982. 9. D. Kunii and O. Levenspiel, "Fluidization Engineering", John Wiley and Sons, New York, 1969.
Failure to be aware of this effect can lead to scale up problems. 4 If one used the Darton correlation to calculate the bubble size for an industrial system such as catalytic cracking, the bubble size turns out to be on the order of meters. Such a bubble would violently shake the unit as the tons of catalyst are splashed when it surfaced. In addition, mass transfer from such an enormous bubble would be so poor t h a t it would limit the ability of re action to take place. As neither of these phenomena take place, there must be a mechanism operating which limits the maximum stable bubble size.
Only continuous operations are discussed. For convenience the term moisture will be extended to include liquid or adsorbed solvent on the solid. Fluid bed drying of granular fluidizable material gives several advantages over alternative processes. Temperature is uniform throughout the bed so t h a t even product dryness is obtained. There is little chance t h a t sensitive materials will suffer local overheating. The excellent heat transfer coefficient from heating surfaces produces low-cost, minimum surface requirements.
Gas Fluidization by MEL PELL (Eds.)