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Rotary Dryer Design & Working Principle by Sunco Machinery

Time:2018年12月20日      Hits:

Rotary Dryer Design:

Rotary dryer machine is one whole drying system, and the drying system need to 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. 

For evaporating the moisture from the wet raw material, Rotary Dryers are designed and constructed for high efficiency and economy in fuel consumption. The rotary dryer machines has the direct heating type, in direct heating type.

Direct heating type rotary dryer machine are used to apply heat / hot air to contact and heat the raw material such as sawdust, wood chips, chicken manure, silica sand, wood shavings, palm fibre, fly ash, etc.

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine

If it is not suitable to apply heat direct to heat and dry the raw material, then rotary dryers of indirect heating design can be furnished so that the heated hot gases will not come in direct contact with the wet raw material. 

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine

Rotary Dryer is a simple, inexpensive unit for reducing the moisture content from the wet material. Several types of rotary dryer machine design can be applied for drying different kinds of raw material. 

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

Rotary Dryer Working Principle:

Wet material goes into the feeding hopper by belt conveyor or bucket elevator or screw conveyor, 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 Dryer Design & Working Principle, rotary drum 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.

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine

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.

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine

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.

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine

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

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine

Sketch Map of Rotary Dryer System:

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine


Rotary Dryer for drying chicken manure:

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine

Rotary Dryer for drying Sawdust:

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine

Rotary Dryer for drying Wood Chips:

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine

Rotary Dryer for drying Wood Shavings in Greece:

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine

Rotary Dryer for drying Sand in Malaysia:

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machineRotary Drum Dryer for drying sand

Rotary Dryer for drying slag in Malaysia:

Rotary Dryer Design & Working Principle, rotary drum dryer, rotary drying machine

For more details of rotary dryer working principle and design, please feel free to contact us:

Email: suncomachinery@hotmail.com

Tel / WhatsApp: +86-158 3821 4261 

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