APV Dryer Handbook - Umbc

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46 FEED HP PUMP COMPRESSED AIR AGGLOMERATION NOZZLES SPRAY BED DRYER Figure 20. Spray Bed type agglomerating spray dryer BAG COLLECTOR FINAL PRODUCT EXHAUST AIR During operation, the chamber fluid bed is vigorously agitated by a high fluidization velocity. As the particles from the spray-drying zone enter the fluid bed with a very high moisture content, they agglomerate with the powder in the bed. Fines carried upwards in the dryer by the high fluidizing velocity have to pass through the spray cloud, thus forming agglomerates at this point, as well. Material from the integrated fluid bed is taken to an external fluid bed for final drying and cooling. ORDINARY INTEGRATED RE-WET SPRAY DRIED FLUID BED AGGLOMERATED POWDER AGGLOMERATION POWDER Wettability, sec. >1000
The Spray Bed dryer is a highly specialized unit that can only produce agglomerated powder, although the degree of agglomeration can be controlled. Agglomerates from the Spray Bed dryer exhibit excellent characteristics. They are very compact and show high agglomerate strength and good flowability. CONSIDERATIONS AND CONCLUSIONS While the agglomeration process improves the redispersion, flowability and non-dustiness of most fine powders, it invariably decreases the bulk density. The comparisons in Table 5 clearly show that agglomeration improves the powder wettability and dispersibility. Individual powder particles with a mean diameter of less than 100 micron are converted into agglomerates ranging in size from 250 to 400 micron with the re-wet method being able to produce the coarser agglomerate. The powder bulk density will decrease from about 43 lb/ft3 (670 Kg/m3 ) to approximately 28 lbs/ft3 (450 Kg/m3 ). Use of the re-wet method will expose the product to one additional processing step which can somewhat affect the proteins, occasionally resulting in a slightly poorer solubility. Since fluid bed agglomeration can be operated as an independent process, it can be used in conjunction with existing powder producing equipment. It offers great flexibility and ease of operation – and provides a convenient way to add functionality, non-dustiness and value to a number of products. 47
Page 1: Improving Process Profitability...C
Page 5: I N T R O D U C T I O N The drying
Page 8 and 9: 8 POWDER TYPE D R Y E R S Fine Free
Page 10 and 11: 10 Direct heating is used extensive
Page 12 and 13: 12 corresponding number of conventi
Page 14 and 15: 14 Two particular types are the dou
Page 16 and 17: 16 particular application and the m
Page 18 and 19: 18 whether there is any need to re-
Page 20 and 21: 20 material comes into contact with
Page 22 and 23: 22 together since both share simila
Page 24 and 25: 24 circulation. Alternatively, and
Page 26 and 27: 26 Each of the types available are
Page 28 and 29: 28 At this time Pulse Drying techno
Page 30 and 31: 30 E F F I C I E N T E N E R G Y U
Page 32 and 33: 32 DRYER FEED MOISTURE CONTENT (% W
Page 34 and 35: 34 DRYING COLUMN SCREW FEEDER PARAM
Page 36 and 37: 36 way a dryer can be turned down i
Page 38 and 39: 38 3. The wetted particles sink int
Page 40 and 41: 40 TEMPERATURE (°C) 150 100 50 0 4
Page 42 and 43: 42 flow patterns, residence time di
Page 44 and 45: 44 As indicated by this partial lis
Page 48 and 49: 48 S P I N F L A S H D R Y E R S fo
Page 50 and 51: 50 PROCESS DESCRIPTION The Spin Fla
Page 52 and 53: 52 Figure 24 illustrates the very r
Page 54 and 55: 54 The drying chamber would be main
Page 56 and 57: 56 COST BENEFITS In comparison to a
Page 58 and 59: 58 S P R A Y D R Y E R S SPRAY DRYE
Page 60 and 61: 60 inwards towards the centerline o
Page 62 and 63: 62 a high speed by a spinning disc.
Page 64 and 65: 64 internal bowl diameter, radial d
Page 66 and 67: 66 variations, some plants utilize
Page 68 and 69: 68 Condensation deposits can freque
Page 70 and 71: 70 HIGH FAT PRODUCTS If the powder
Page 72 and 73: 72 INLET TEMPERATURE The powder coo
Page 74 and 75: 74 POWDER DENSITY The density of sp
Page 76 and 77: 76 chamber wall, tending to scour a
Page 80: Local Office APV Separations Produc

APV Dryer Handbook - Umbc

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