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Solution of solid/liquid is dried into dried powder/granule Spray drying process is applied in liquid process shaping and drying industry. The solution/emulsion/suspending liquid is sprayed into round cylinder drying chamber through atomizer by pump transmission. The solution/emulsion/suspending liquid is atomized into micro fogdrop. The fogdrop meet hot air into powder/granule quickly with high temperature.
Equipment model: Powder from GLP HIGH SPEED CENTRIFUGAL SPRAYING DRYER
Granule from YPL PRESSURE SPRAY DRYER/GRANULATOR
Moisture powder/granule/pellet is dried into dried powder/granule/pellet Originally fluid bed drying was used to replace the cumbersome and time consuming tray drying, which sped the process up by about 20 times as fast. Tray drying did not permis a uniform residual granule moisture, because this method presented an unpredictable combination of drying by conduction, convection and radiation. When fluid bed drying all particles are permanently suspended and mixed; allowing an efficient convection drying only. Nevertheless, the inlet air temperature should be chosen in order for drying to be effected in a thermodynamic equilibrium, i.e. the hot air only removes as much moisture from the surface of the granules as can simultaneously travel outwards through the capillaries of the granules. Should the process air temperature be too high, the capillaries can easily close on the surface of the granules. From that moment onwards, convection drying will change to diffusion drying, resulting in extensively extended processing times. These principles apply to any fluid bed drying, irrespectively, if drying high-shear granules or spray agglomerates, if batch or continuously processing. It has to however be considered that if effecting spray granulation, agglomeration or coating, one does not only remove a defined moisture content to a defined final residual value, but that drying also occurs during the spray process itself, i.e. that too high process air temperatures may also result in unsufficient liquid bridge, porous granule structures or frosty looking films. On the other hand, too low temperatures may result in lumps or a high percentage of agglomerates when filmcoating.
Fluid-bed drying process:
Tray Dryer:
Moisture cake shape material is dried into dried powder Flash dryer is used for drying materials such as cake shape material. The cake material is transmitted into drying chamber by screw feeder. The cake material is shattered by high speed rotary oar.The hot air is blowed by blower. The moisture material shattered is moved to top through force of exhaust fan.The big mass or granule is blocked by the classifying class plate on the top,and the big mass is dropped into bottom and shattered again. The final dried powder is exhausted and collected by cyclone separator and cloth-bag collector. Equipment model:
Heat sensitive material drying with low temperature Generally vacuum dryer dry the heat sensitive material. The drying temperature range: 45 deg C - 60 deg C
Equipment model: ZPD VACUUM HARROW DRYER
Dehydration vegetable/herb drying Belt dryer dry dehydration vegetable/herb/strip/granule with high moisture and not permission high temperature. Put the moisture material into tray or SS mesh belt of belt dryer. The material tray is transmitted from one side to the other side. The hot air is flowed inside of belt dryer. The moisture of material is evaporated. The equipment model: DW BELT DRYER |