Rotary drum dryers are one of the most widely used types of industrial dryers on the market today. Their heavy-duty design high throughput long-term reliability and simple operation has lent them to a wide range of applications in a variety of industrial process settings. They are the dryer of choice for processing fertilizers and soil amendments animal feeds minerals and ores and so much more.Get A Quote
Rotary drum dryers are one of the most widely used types of industrial dryers on the market today. Their heavy-duty design high throughput long-term reliability and simple operation has lent them to a wide range of applications in a variety of industrial process settings. They are the dryer of choice for processing fertilizers and soil amendments animal feeds minerals and ores and so much more.
While rotary dryers have a relatively straight-forward design many questions often arise in considering a rotary drum dryer for a given application even when the application is well-established. Below are answers to some of the most frequently asked questions surrounding rotary drum dryers.
Rotary dryers consist of a large rotating drum through which wet solids are passed. As the material moves through the dryer heat and air are used to remove the desired amount of moisture with the mode of heating dependent on whether the unit is of the direct or indirect configuration. Most dryers are of the direct design in which the material is in direct contact with the combustion gases as this is the most efficient approach to moisture removal.
The material is cascaded in the dryer at carefully controlled temperatures for a predetermined amount of time referred to as the retention or residence time to reach the desired final moisture content.
In the case of direct dryers internal flights or lifters are used to pick up material and cascade it through the stream of combustion gases in order to maximize heat transfer efficiency.
Rotary Dryer Drier FlightsLifting flights inside a FEECO Rotary Dryer
The principle difference between a direct rotary drum dryer and an indirect one is how heat is introduced to the material. Direct dryers rely on convective heat transfer from direct contact between the material being processed and the combustion gases to efficiently dry the material. Conversely indirect dryers avoid contact between the material and combustion gases instead relying on heat transfer to occur through the drum shell wall via conduction.
While this approach is less efficient than the direct dryer type it is an essential processing option when working with materials that must be processed in an inert atmosphere such as when processing sterile products. The indirect configuration is also chosen when processing ultra-fine materials as it avoids the risk of solids becoming entrained in the gas flow and ending up in the exhaust gas system.
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