Drying is achieved by passing the material being processed through a horizontal rotating cylinder, fitted internally with a series of louvres so arranged that the drying air passes through a moving bed of the material to be dried. The rotation of the drum imparts a rolling action to the bed of material so that intimate mixing and contact with the drying air is achieved without lifting and dropping the material through the drying air stream.

Because of this intimate contact between material and air the drying efficiency of the rotary louvre dryer is significantly greater than that normally achieved with a conventional rotary cascade dryer.

The dryer drum is generally designed and manufactured to the same mechanical specification as the Simon Rotary Dryer, except that the internal flights are replaced with internal louvres. These louvres can be arranged to give multistage drying or drying and cooling within the same dryer drum.

The drying air may be heated directly by means of an oil or gas burner firing into a refractory lined combustion chamber and annulus between the combustion chamber and outer casing. Alternatively, the air may be heated indirectly by means of an air to air, steam to air, thermal oil or electricity heated heat exchanger. Typical drying air temperatures range from 100 C to 700 C.

The drying air stream is directed into the dryer through a fixed head-plate which, as the air is at a positive pressure, is fitted with spring loaded friction seals to prevent drying air losses. Exhaust gases are drawn from the dryer by the exhaust air fan with ducting to the gas cleaning equipment.

Material flow through the dryer is controlled by the varying the depth of the bed of material in the dryer. This is achieved by means of bolt-on discharge rings or, where large variations in throughput or complete emptying of the dryer drum are required, a multivane type discharger.

ROTARY LOUVRE COOLERS

Cooling is effected by passing the material to be cooled through a horizontal rotating cylinder, with internal louvres to the same basic design as the Rotary Louvre Dryer, in which a current of cold air is directed through the moving bed of material.

R.Simon Rotary Louvre Dryers and Coolers are available in a range of sizes from 600mm dia. by 1.8M to 3.5M diameter by 14.0M.

ROTARY DRYERS - Rotary Cascade - Rotary Louvre - Rotary Steam Tube -
Construction and Operation - Machine Sizing - Materials Processed

Details of - Drum Dryers - Drum Flakers - Tubular Dryers & Coolers -
Rotary Dryers & Coolers - Calciners

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