DRYTECH INTERNATIONAL (PTY) LTD
   
 
Physical Address:
50 Mimetes Road
Denver
Johannesburg
Gauteng
South Africa
 
Telephone Number:
+27 (0)11 622-2773
 
Fax Number:
+27 (0)11 615-1801
086 530-4361
 
 
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Drytech - Thermal Drying - Flash Drying - Fluid Bed Drying (static and vibrated) - Roto Louver Drying - Conveyor Drying - Vacuum Drying (Batch or continuous) - Calcination - Rotary Dryers and Spray Dryers
Drytech - Thermal Drying - Flash Drying - Spray Drying - Fluid Bed Drying (static and vibrated) - Rotary Drying - Roto Louver Drying - Vacuum Drying (Batch or continuous) - Calcination and Conveyor DryingDrytech - Thermal Drying - Spray Drying - Fluid Bed Drying (static and vibrated) - Rotary Drying - Roto Louver Drying - Conveyor Drying - Vacuum Drying (Batch or continuous) - Calcination - Custom Designed Dryers and Flash DryersDrytech - Thermal Drying - Flash Drying - Spray Drying - Rotary Drying - Roto Louver Drying - Conveyor Drying - Vacuum Drying (Batch or continuous) - Calcination - Fluid Bed Dryers and Fluidized Bed CombustorsDrytech - Thermal Drying - Flash Drying - Fluid Bed Drying (static and vibrated) - Roto Louver Drying - Conveyor Drying - Vacuum Drying (Batch or continuous) - Calcination - Rotary Dryers and Spray Dryers

Drytech - Thermal Drying - Flash Drying - Spray Drying - Fluid Bed Drying (static and vibrated) - Rotary Drying - Roto Louver Drying - Vacuum Drying (Batch or continuous) - Calcination and Conveyor Drying   Drytech - Thermal Drying - Spray Drying - Fluid Bed Drying (static and vibrated) - Rotary Drying - Roto Louver Drying - Conveyor Drying - Vacuum Drying (Batch or continuous) - Calcination - Custom Designed Dryers and Flash Dryers   Drytech - Thermal Drying - Flash Drying - Spray Drying - Rotary Drying - Roto Louver Drying - Conveyor Drying - Vacuum Drying (Batch or continuous) - Calcination - Fluid Bed Dryers and Fluidized Bed Combustors   Drytech - Thermal Drying - Flash Drying - Fluid Bed Drying (static and vibrated) - Roto Louver Drying - Conveyor Drying - Vacuum Drying (Batch or continuous) - Calcination - Rotary Dryers and Spray Dryers

Drytech International

 

Rotary Dryers

Large throughputs and high evaporative loads.

Rotary Dryer - Rotary Drum Dryers - Rotary Dryer Design - Dryers Sugar Rotary - Rotary Vacuum DryersOperation:
Rotary cascade dryers have the feed materials pass through a rotating cylinder together with a stream of hot gas. Internal lifters or flights elevate the feed and drop it in a curtain from the top to the bottom cascading along the length of the dryer. Flights need to be carefully designed to prevent asymmetry of the curtain. Material moves from one end of the dryer to the other by the motion of the material falling due to the angle of inclination of the drum. Some rotary dryers are double and triple pass units where each drum is nested inside the previous drum.

Rotary louver dryers have the feed materials supported and moving over a set of louvers mounted to an external rotating drum. The hot gas is introduced into a tapered bustle below the feed ring. The air passes through the louvers and then the product before being exhausted from the dryer. The rotation of the drum causes the material to roll and mix providing intimate contact with the drying gas. Material moves from one end of the dryer to the other by the motion of rolling, some fluidization and due to the angle of inclination of the drum.

Rotary Dryer - Rotary Drum Dryers - Rotary Dryer Design - Dryers Sugar Rotary - Rotary Vacuum DryersFeeding / discharge:
Automatic and continuous. Vibrators, screw feeders, rotary airlocks, double flap valves, gravity chutes.

Feed characteristics:
Powders, granules, non friable agglomerates, large solid particles. Low to high feed rates.

Heat source:
Steam, electrical, coal, liquid fuels, or gas.

Exposure:
Mostly Direct. Flow is co-current or countercurrent for cascade dryers. Flow is a combination of through the bed, cross, co-current or countercurrent for rotary louver.

Residence time:
Controllable. Residence time can be altered by varying the speed of rotation of the drum and the drum angle. Fill can be varied. Fills are typically between 7% and 25% of the cross sectional area of the drum.

Extraction:
Normally induced. Systems can have combustion, forced and induced draft fans for operation.

Dust collection:
Cyclones, bag houses, scrubbers, Electrostatic precipitators. Systems require dust collection.

Control:
PLC, infrequently solid state controllers. System controls on discharge temperature. Can modulate energy and feed.

Spray Dryers

Single process conversions of liquids into free-flowing granules as well as transforming product characteristics.

Spray DryersOperation:
Spray drying involves the atomization of feed to a spray of droplets which are contacted with hot air in a drying chamber. Sprays are produced by a rotary atomizer or pressure nozzle atomizers. Evaporation of moisture from the droplets and formation of dried particles proceed under controlled temperature and air flow conditions. There are various dryer configurations. It is possible to meet specified product characteristics (re-hydration, moisture content, particle size, bulk density) by selecting the correct technology and configuration of the dryer.

Feeding / discharge:
Automatic and continuous. Pressure nozzle, two fluid, and rotary atomizers. Depending on the atomizer type may require high pressure pump or low pressure pump.

Feed characteristics:
Liquids, slurries, low viscosity pastes. Low to high feed rates.

Heat source:
Steam, electrical, coal, liquid fuels, or gas.GA Final Spray Dryer

Exposure:
Mostly Direct. Flow may be co-current, counter current or fountain.

Residence time:
Short residence times. Fine dispersion and low velocities allow effective drying. Residence time can be altered by varying the drying air velocities somewhat.

Extraction:
Normally induced. Systems can have combustion, forced and induced draft fans for operation.

Dust collection:
Cyclones, baghouses, scrubbers, Electrostatic precipitators. Systems require dust collection.

Control:
PLC, infrequently solid state controllers. System controls on discharge
temperature. Can modulate energy and feed.