Conveyor Dryer

SFE Conveyor dryer is continuous through-flow drying equipment for drying breathable good sheet, strip, granular materials, the dryer has fast drying, high evaporation strength, good product quality advantages.

Suitable for the drying of granule products, marine, carrot, mushroom, green vegetables, bell pepper, garlic, pumpkin, sweet potato, bamboo shoots, products, etc.

The materials are uniformly load on the mesh-belt by feeder. The mesh-belt uses generally mesh stainless steel screen and it is drawn and moved inside mesh belt dryer by a transmission device. The drier is composed of several units. For each unit, the hot air is circulated separately. Temperature in each unit is separately controlled.

Drying process is: hot air passes through the mesh-belt from the top to the bottom or from the bottom to the top, and this will complete the heat and mass transfer process. The air pipe of the top is connected with fan, one part of air is circulated, some exhausted gas is discharged with a special moisture exhausting blower, and other waste gas is controlled through an adjustment valve. The unit amounts can be selected according to the demand.

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.

Steam, electrical, coal, liquid fuels, or gas Exposure Mostly Direct

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

Very intimate contact with air/gas stream
Good for heat sensitive products and products requiring long residence times
Energy efficient due to recycling of process air Multiple zones offer flexibility for temperature and process control
Excellent transfer of energy
Can vary flows between zones
Gentle handling of product
Self-contained with distributed foundation loading
Unit can have integral cooling section.

High temperature units can be troublesome
Heater can clog on carryover
Belt tracking can be problematic
Belt may clog, requires frequent cleaning
Loss of times through perforations on flights or belt

440 volts, 3 phase, 50 Hz

L.P.G. gas at 4-6” W.C. pressure other gas characteristics available.

Insulated with 1250 F industrial Rockwool 4” for

550 F models; 15” high conveyor work space with adjustable

Spill exhaust ; specify  vertical  downward airflow pattern or horizontal side to side airflow pattern.

1”X1” mesh carbon steel conveyor belt with 18” long extension at each end for loading and unloading ; variable
Speed adjustable from 4” to 11” per minute (other speeds available).

Inconel-sheathed tubular heating elements. Completely enclosed ; indicating temperature controller ;pilot lights to indicate when blower, conveyors and heaters are energized; motor starters and heating element
Contactors electrically interlocked to shut off heaters if power to blower or conveyor is interrupted and to permit operation of blower without heat for cooling ; high-low heat switch for temperature uniformity over
Entire range.

Control panel as in electric models; Gas burner protected with electronic combustion control relay to insure safety push button electric ignition for ease operation.

Hydraulically or pneumatically operated oscillating boom with conveyor belt to carry the product to the feed point.

Used to convert wet, paste like materials such as filter cake into small extrusions. These feeds provide shapes of uniform cross-section that are distributed across the conveyor to furnish a porous bed of product that can be readily dried.

For many free-flowing products, the economical Hopper Feed can evenly distribute the material on the conveyor at desired depth. A handwheel provide easy adjustment of a slide gate to control the product flow.

Mounted on the dryer feed end, the SFE Oscillating Spout is used to evenly spread a product across the conveyor width. Low in cost, this unit can feed and extrude or pelletize product onto the conveyor for uniform drying.

Various types of conveyor cleaning systems supplied by SFE

Motorized brushes can be used to efficiently sweep away product adhering to the conveyor.

To periodically or continuously wash a conveyor while the dryer is in operation.

The use of live steam provides a highly efficient means of cleaning conveyors.

Mounted on the conveyor, this system uses a gas flame to burn off material sticking to the conveyor plates. This cleaning system can be used at intervals to prevent the product from reducing the drying efficiency.

A screw type conveyor mounted below the dryer conveyor may be supplied to carry the product fines to the side of the dryer.

SFE co-operates with customers in developing conveying systems for carrying the product from the delivery end of the dryer