Rotary Drum Dryer Working Principle

03-22-2013 Hits：

Rotary Drum Dryer Working Principle:

Wet material goes into the feeding hopper by belt conveyor or bucket elevator, then through the feeder goes into the feed pipe. The feed pipe slope is greater than the natural inclination of the materials, so that the material can inflow the rotary dryer smoothly.

Rotary Drum Dryer Working Principle, Rotary Drum Dryer, Rotary Dryer, Rotary Drying Machine

There is one hot air furnace supply the hot flue gas for the rotary dryer usually. The fuel can be waste wood, coal, natural gas, diesel, etc.

hot air furnace for the rotary dryer, rotary drum dryers

The rotary dryer cylinder is tilted slightly compared with horizontal. Materials and hot flue gas goes into the rotary dryer cilinder from the higher end. During the rotation of the cylinder, the material by gravity goes into the lower end. When the wet material is in the process of moving forward in the rotary dryer cylinder body, the lifting plates inside the rotary dryer cilinder makes the material up and down to contact with the hot flue gas completely. Thus, the moisture inside the wet material is evaporated into water vapour, and finally we get the dried materials.

Lifting plates on the inner wall of the rotary drum dryer, rotary dryers

There is one high pressure induced draft fan is used to suck out the water vapour out of the rotary dryer during the drying process. Finally the water vapour with some dust goes into the cyclone dust collector. In the cyclone dust collector, the dust is seperated from the water vapour and falls down from the bottom of the cyclone dust collector; the water vapour leaves the cyclone dust collector from the top pipe of the cyclone dust collector, and finally goes into atmosphere through the chimney.

At the end of the rotary dryer, using one belt conveyor to transport the dried material into trucks or storage room directly.

Belt Conveyor at the end of the rotary drum dryer system

The rotary drum dryer seems very simple, but in fact it is one whole drying system, and the drying system should be designed according to:

--- The features of raw material, for example the wet sand has surface water which is easier to be dried, but the wood chips has inner water which is more difficult to be dried.

--- Initial moisture content(%) of the wet material.

--- Output moisture content(%) the dried material needed.

--- Bulk density (kg per cubic meter) of the wet material.

--- Input capacity (ton per hour).

--- Output capacity(ton per hour).

--- Fuel Choice such as coal, waste wood, natural gas, diesel, etc.

--- End use of the dried product.

When the above information are clear, then Sunco Machinery engineers can calculate and design the suitable and reasonable rotary dryer system for the customers accordingly.

Sketch Map of Rotary Drum Dryer System:

Sketch Map of Rotary Drum Dryer System