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Rotary Cum Flash Dryers (Suitable for DDGS/SPENT/EXTRACT)

The Infinite Dryer " RFD series Dryers" based on Rotary Cum flash drying principle is an Intelligent & Innovative approach to dry any kind of Biomass /herbal extract/spent residues with input moisture level as high as 65 % to 15 % , almost instantly in a single stage operation, with maximum efficiency and minimum cost.

The most important features of the system is extremely quick drying. In this dryer, wet residue is fed on one side & the dried material exits the dryer, in a matter of seconds. This Dry waste/herbal extract can be used as a fuel in your existing Boiler or heating systems.

"RFD series Dryers" is a revolution in the Drying technology & are best in class in terms of reliability, performance, maintenance and cost of operation. It encompasses many traditional ideas and utilizes today’s cutting edge engineering & technology ,which makes the machine more operator friendly ,durable , problem free while ensuring high performance & efficient processing around the clock.

The rotary dryer will be employed to reduce or minimize the liquid moisture content of the material it is handling by bringing it into direct contact with a heated gas. The dryer is made up of a large, rotating cylindrical tube, usually supported by steel beams. The dryer slopes slightly so that the discharge end is lower than the material feed end in order to convey the material through the dryer under gravity.

Material to be dried enters the dryer, and as the dryer rotates, the material is lifted up by a series of internal fins lining the inner wall of the dryer. When the material gets high enough to roll back off the fins, it falls back down to the bottom of the dryer, passing through the hot gas stream as it falls. This hot gas stream can either be moving toward the discharge end from the feed end (known as co-current flow), or toward the feed end from the discharge end (known as counter-current flow). The hot gas stream is made up of a mixture of air and combustion gases.

As mentioned earlier, the drier would be mixture of rotary cum pneumatic type. The drier columns would be of fabricated M.S construction with a appropriate thickness for extra long life. The drier system would consist of dryer columns of sufficient length in a single loop.

The wet material would be fed into the system just ahead of the dryer. Immediately on entering the system, the due to the high temperature gradient available there would be instantaneous drying of surface moisture which would bring down the temperature of the hot gas to 200 - 250 oC. The removal of the remaining moisture would be completed in the dryer columns by direct heat transfer between the material and the hot gas which carries it.

All parts of the dryer column would be well insulated by mineral / glass wool type insulation for reducing the heat loss and restrict the surface temperatures to 70 oC.The entire system would be powered by a centrifugal blower located immediately after the dryer columns. The blower would be belt driven by an electric motor.

Silent feature of RFD

  1. Drying is completed at low outlet drying temperatures, giving high energy utilization efficiencies.
  2. High drying efficiency and low energy costs.
  3. Continuous processing .
  4. Low operator overheads and minimum maintenance costs.
  5. Capable of processing high capacities in a relatively small amount of space.
  6. Ease of installation.