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 - 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 - 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



Custom Designed Dryers

Direct, indirect and combination systems for special applications can be accommodated within the range or by custom design.

Microwave dryers
The technology behind microwave drying relies on the polarity of the moisture molecule. Water which is a dipolar molecule (and perhaps the most common asymmetrically charged molecule) reacts to the microwaves, while non polar molecules do not. Microwaves also penetrate to the center of the product, being unaffected by shadows or product density. The molecules react by trying to align themselves to the electromagnetic charge. Because the microwaves’ electromagnetic field reverses at an enormously high frequency (as much as a couple of billion times per second), the dipolar molecules continually change alignment, producing energy that is converted into heat. In effect, the water molecules heat themselves until the product becomes so hot that the water evaporates. Microwave dryers can be incorporated into a number of standard configurations, such as cabinet, conveyor and tray type systems. Vapors formed by the process must evolve and not be 'trapped' or they will 'explode' out. The evolved vapors need to be able to be extracted from the system.

Freeze dryers
In freeze drying one usually requires to sustain some property of the feed for final product. Therefore one needs to freeze the product to stabilize its structure. The product is frozen to the temperature of the lowest constituents freezing point and then the drying chamber is evacuated to promote sublimation (the changing of a solid to a vapor without going into the liquid stage). The vapor is expelled through the vacuum pump.

Flash Dryers

High volume, availability and thermal efficiency covering small to extremely large throughputs.

Flash DryersOperation:
Flash drying uses a heated gas to pneumatically convey the feed up a flash tube and into a primary air separation device; most commonly a cyclone. Air is induced or forced into the feed area through a hot gas generator where it entrains the feed and flashes off the moisture as it conveys. The product is fed into the throat of the feed area in a controlled fashion. The particles attain a velocity in the order of 80% of the conveying velocity. Secondary dust collection such as multiclones, baghouses, scrubbers and electrostatic precipitators are required for fine products.

Feeding / discharge:
Automatic and continuous. Vibrators, screw feeders, rotary airlocks, double flap valves, gravity chutes. Backmixing is most effective on sludges. Feed introduced into airstream via venturi or use of disintegrator technology.

Feed characteristics:
Slurries, pastes, and sludges (all with back mixing), friable filter cakes, powders, granules. Feed needs relatively consistent particle size. Very large particles present challenges. Low to higFlash Dryersh feed rates.

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

Exposure:
Mostly Direct. Flow is co-current.

Residence time:
Extremely short (seconds). Residence time can be altered by increasing hold up times in cyclone.

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

Dust collection:
Cyclones, baghouses, scrubbers, Electrostatic precipitators. Systems require significant dust collection since this is the product collection mechanism.

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