Download Fluidization, Solids Handling, and Processing: Industrial by Wen-Ching Yang PDF

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 technique industries spanning the fundamental and strong point chemical substances, agricultural items, prescribed drugs, paints, dyestuffs and pigments, cement, ceramics, and digital fabrics. Solids dealing with and processing applied sciences are hence 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 iteration, mineral processing, meals processing, soil washing and different similar waste therapy, environmental remediation, and source restoration strategies. The FCC (Fluid Catalytic Cracking) know-how quite often hired within the smooth petroleum refineries is additionally in line with fluidization rules.

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1 m bed. 5 cm/s. Yerushalmi and Avidan (1985) assert that in large shallow beds where slugging does not occur, transition from bubbling to turbulent flow should be independent of bed size. 0 Fluidization, Solids Handling, and Processing EXPERIMENTAL MEANS TO ACCOUNT FOR SCALEUP: USE OF SCALE MODELS Since large pilot plants are costly, it may not be feasible to undertake an extensive scale-up program. Furthermore, large beds are difficult to instrument to observe detailed behavior. Thus, many test results from beds at elevated temperatures and pressure are confined to overall operating characteristics leaving the designers to speculate on the cause of shifts in performance with bed size.

5 122 61 WALL SPACING Dr CH Figure 15. lmf=76 cm, probeheight=46 cm. 8Umf; T denotes with tubes. Experiment uncertainty = 20%. 2 Mixing Van Deemter (1980) surveyed data on solid mixing in fluidized beds of different diameters. 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.

33) CD = f ÿ ρ f uo d p ÿ µ In the more general case, CD will also be a function of particle shape, sphericity, surface roughness and turbulence intensity of the fluid. The dimensionless drag coefficient β L (ρs uo ) in Eq. (30) can be expressed in terms of other fluid parameters by the use of Eqs. (31–33). For low voidages where the Ergun-like expression holds, Eq. (34) ρf ρ u o d 2p ϕ 2 L βL , =f ÿ s ÿ µL dp φ ρs ρs u o In this expression dp represents the mean diameter when a distribution of different size particles are in the bed.

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