Customized Rotary Drying Plant
The Rotary Dryer
Despite the introduction of new technology, the long established
Rotary Rotary Dryer is still widely regarded as the workhorse of
many process industries. The robust yet simple construction
combines flexibility with reliability, enabling this type of dryer
to handle a vast range of materials and to operate continuously
under the most arduous conditions. The design also permits the use
of the highest possible drying temperatures and in contrast to
other dryers is not sensitive to wide variations in material size,
moisture content or throughput.
Calcination Materials Mineral Material Coal slime Gypsum Sand Clay Sludge Refactory material Phosphates Limestone
| Specifications Diameter: 600mm to 3500mm Length: 8000mm to 65 000mm Methods of heating: Direct or indirect Capacity: 500kg/h to 175t/h Fuel: coal, natural gas, heavy oil, etc Temp range: 200-700°C Material: Carbon steel, Stainless steel, etc Thickness: 8mm to 70mm
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Principles of Operation
In its simplest form, the Rotary Dryer consists of a slightly
inclined rotating cylinder, fitted with a series of peripheral
flights arranged to lift, distribute and transport the material.
The flights are designed to suit the particular handling
characteristics of the material, which may vary with increasing
dryness. The principle of operation is based on showering, or
cascading the wet material through a hot gas stream, flowing either
co-current or counter-current to the solids. The hot gas induces
the evaporation of the moisture. The heat lost to the material and
evaporation of water vapor reduces the gas temperature rapidly,
such that it leaves the dryer at a comparatively low temperature.
The efficiency of the dryer is largely dependent on the
differential between the inlet and exhaust gas temperatures,
although the heat transfer rate is also influenced by the
relationship between the design of flights and the speed of
rotation. However, irrespective of the gas and material
temperatures the drying (or residence) time may be critical, as
this is governed by the rate of diffusion of water from the core to
the surface of the material. For special applications, the rotary
cascade design is adapted to provide a shortfall, or ‘Cruciform’,
lifter configuration.
1 What material do you need to dry?
2 What is the production capacity?
3 What is original moisture and final water content?
4 When and where do you use our machine?
5 Do you only need one dryer machine, or also need dust collector,
conveyor, etc?
7 Is there any plan to come and visit us?
8 Do you have special requirement for outside color?
9 What kind of heating sources do you prefer to use?
We provide you technical details if let us know your requirement.
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