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How does a disc dryer work - working principle

Drying of any material is performed by using saturated steam, in the pressure range of 6 to 10 barG, and temperatures from 158 °C - 180 °C. The main parts of the machine are the stator and rotor. Double-wall discs are welded perpendicularly to the rotor, which rotates around the central shaft. The indirect heat is transferred from steam to the dried material, which is continuously mixed and moved along the machine. The additional heating surface can be achieved by adding to the stator heated steam jacket. Scrapers welded to a stator ensure continuous mixing and are preventing material from sticking to the discs. Paddle brackets for material mixing are mounted on the disc periphery. Contaminated vapor is discharged by a centrally placed vapor dome to the exhaust gases purification system.

Disc dryers technology have been invented in the 1960s and was developed for fish meal. The horizontal, industrial-disc dryer is still used in the industry as a robust and heavy-duty machine. Over the years, it has turned out that the service life of the dryers can reach 30 years. Stainless steel design can guarantee a long life of the machine and corrosion-free construction. Capacities vary depending on machine size.


Characteristics of a thermal disc dryer

Meat rendering and fish meal rotary disc dryer allow removing unnecessary fluids from fish and from animal by-products. Rotary dryers are made to work with a steam pressure of up to 10 bar and have become an excellent solution due to their use of the natural fat content of the material. The large surface area of the rendering disc dryer affects effectively on the evaporation process of water vapor. For the flexible flow of the material, a variable speed drive can be mounted at the discharge end. Disc dryer capacity varies depending on water content and heat transfer of dried material. Rendering thermal-dryers undergo detailed quality control. In addition, a pressure test is carried out prior to each shipment. Fish meal and meat rendering disc dryers are designed for the following PED, ASME, DNV, TUV, Lloyd's, and Bureau Veritas standards.


Types of animal meal that can be produced by thermal-dryer

  • Fish meal
  • Bone meal
  • Poultry meal
  • Hydrolyzed feather meal
  • Spent grain

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For more technical information, please see our technical data sheet.