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 - 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 - 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


Calciners

CalcinersHigh and low temperature rotary and fluidized bed reactors and calciners for reactive and chemically aggressive processes.

Operation:
Rotary tube furnaces and reactors transport the feed from the inlet to the discharge of the reactor by the rotation of the drum and the angle of inclination of the drum. The drum tube passes through a furnace that is heated either by electrical elements or by gas burners. This energy heats the tube which is in direct contact with the feed internally. Special lifters in the drum promote the exposure of the feed to the heated surfaces by a rolling motion of the material. The product is discharged through a suitable airlock device.

Feeding / discharge:
Automatic and continuous. Vibrators, screw feeders, rotary airlocks, double flap valves, gravity chutes.

CalcinersFeed characteristics:
Powders, granules, non friable agglomerates. Low to high feed rates.

Heat source:
Electrical, or gas.

Exposure:
Product contacts the heated surface of the drum. Special lifters turn the product exposing it to the heated surface.

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.

Dust collection:
Systems can be low dust with minimal separation requirements. If required cyclones, bag houses, scrubbers, Electrostatic precipitators.

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


Conveyor Dryers

Continuous multi-zone, for minimum physical drying attrition.

Conveyor DryersOperation:
Conveyor drying uses a perforated belt to transfer feed materials through the dryer. Heated air is either passed under and through, or over and through the belt and product bed before being reheated and re-circulated. Units are normally multi-zoned and may have differing airflow's in successive zones. Additionally each zone may use a different temperature profile and control. Saturated or close to saturated air is exhausted from the dryer via a central exhaust duct.

Conveyor dryers may be multi-pass units, in which the feed is transferred from one belt to another belt below it by gravity. These dryers are usually two or three pass machines. Additionally certain conveyor dryers, such as those used in vegetable dehydration have multiple belts in line, and the feed is transferred from one belt to another.

Feeding / discharge:
Manual, batch, automatic and continuous. Vibrators, oscillating feeders, gravity chutes.

Feed Characteristics:
Large granules, agglomerates, pellets, preformed (extruded) products (pressure agglomerates), small solid particles, large solid particles, agricultural products. Low to high feed rates.

Conveyor DryersHeat Source:
Steam, electrical, coal, liquid fuels, or gas.

Exposure:
Mostly Direct. Flow can be through the bed (under to over, over to under, or both), cross, counter current or co-current. Indirect systems available for certain products.

Residence time:
Highly Controllable. Residence time can be altered by varying the feed and discharge rates affecting the bed depth. Belt can be slowed and modulated.

Extraction:
Normally central induced. Re-circulating fans used in each zone. Exhaust connected to common header.

Dust Collection:
Typically little required. For fine product a central baghouse is sometimes used.

Control:
PLC control for each zone, infrequently solid state controllers. System controls on above bed temperature. Can modulate energy.