Rotary dryers are a highly efficient industrial drying option for bulk solids. They are often chosen for their robust processing capabilities and their ability to produce uniform results despite variance in feedstock. Rotary dryers work by tumbling material in a rotating drum in the presence of a drying air. They can also be indirectly heated to avoid direct contact between the material and processing medium.
Applied material : Rotary dryers are essential dryers for mineral processing. Hongji's rotary dryer can dry more than 200 kinds of materials, including slime, limestone, river sand, clay, iron oxide scale, sludge, coke, copper concentrate, silicon carbide powder, rare earth ore, mineral powder, tin ore powder, Cobalt ore powder, nickel ore powder, manganese ore powder, gypsum powder, bentonite, kaolin, gold ore powder, iron ore powder, steel slag, fluorite ore, coal, etc.
The rotary unit consists principally of a revolving cylinder, slightly inclined to the horizontal, supported in two riding rings resting on two trunnion rolls each, with the trunnion roll bearings mounted on structural steel bases. On either side of one of the riding rings is an adjustable thrust roll for holding the cylinder in its longitudinal position. The cylinder is rotated by means of a girt gear meshing with a spur pinion mounted on the slow speed shaft of a speed reducer. The high shaft of the reducer is directly coupled to an electric motor. The interior of the cylinder is fitted with spiral flights at the feed end to quickly move the feed product into the active section, where longitudinal parallel lifting flights pick up the product and cascade it in thin even sheets, so that it will dry most advantageously.
The cylinder is arranged so that the hot gases and product pass continuously in same directions, that is cocurrent flow. The time of passage of the product thru the rotary unit is controlled by the slope of the cylinder to the horizontal the rotational cylinder speed, and the velocity of the gases thru the cylinder. At the discharge end, the cylinder is enclosed by a breeching with seals. The breeching is hoppered and flanged for attaching the Purchaser’s receiving equipment. At the feed end, the cylinder is provided with an inlet head equipped with feed chute and seals. The front of the breeching is flanged for connection to the hot gases generator. Both discharge and feed inlet head are supported by structural steel supports. The hot gases for the drying process are produced in a temperature controlled gas generator equipped with fuel burner. Combustion chamber is refractory lined and combustion air cool outside shell of the chamber and at the end of the chamber conditioning air is added to hot gases to keep operating temperature requested.
The system is automatically controlled and flame supervision is provided for the burner. The exhaust gases and removed water vapour are dedusted and cleaned in accordance with local regulation and vented to atmosphere.
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