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Continuous disc dryer

The continuous disc dryer uses hot air or gas as a drying medium in combination with a heating jacket and heating rotor. The rotor consists of special, heated discs within a cylindrical jacketed housing. It is a low-speed, horizontal, indirect dryer, suitable for heating and cooling various types of product like filter cakes, powders, viscous materials and granules.

It is a compact dryer that combines high heat transfer rates ranging from 85 to 300 W/m²K with high surface/volume ratios. Residence times range from minutes to several hours, making the continuous disc dryer more versatile than almost any other indirect heat exchanger available today.

Continuous disc dryer Continuous disc dryer Continuous disc dryer Continuous disc dryer Continuous disc dryer Continuous disc dryer


The rotor is designed with vertically-mounted, double walled hollow discs. Heating media flows through the rotor, the discs and the jacketed vessel surrounding the rotor with the discs providing 85% of the total heating surface.

The rotor speed varies from 0.1 up to 0.5 m/s and is not dependent on the residence time, enabling optimum mixing and optimum heat transfer. The residence time can be adjusted from several minutes up to several hours.

The wet product is fed into the inlet of the disc dryer and the rotating discs gently convey the product towards the outlet. The vessel has an average product hold-up of 60 to 90% of vessel volume.

Stationary plows or breaker bars are located between the discs in order to achieve better mixing and prevent material build-up on the heat transfer surface. Combined heating of the rotor and the jacket results in high heat efficiency transfer and the dry product is discharged at the outlet port.

The twin disc provides 20-30% more heat transfer surface in the same amount of floor space as the single rotor disc dryer. With two intermeshing rotors, this dryer can handle light fluffy materials, fibrous masses and non-free flowing products.

This dryer can be used for batch or continuous operation, can operate under pressure or vacuum and can process:

  • Wet powdery materials
  • Wet cakes
  • Slurries
  • Materials requiring very long residence times
  • Sticky materials with back-mixing

To determine the optimal configuration of the disc dryer for handling your product(s) we maintain a unit at our testing facilities.

 

  • Suitable for heating, drying, cooling, reacting, coating and/or de-agglomeration
  • Able to handle a variety of products such as wet powders, wet cakes, slurries and viscous materials
  • Suitable for batch or continuous operation, also under pressure or vacuum
  • Adjustable residence time (15 up to 60 min.)
  • Wide range of heat transfer coefficients, residence times and temperature profiles in one unit
  • Energy efficient with a thermal efficiency of 1.1 - 1.4 kg steam per kg evaporated water
  • Compact design with a high heat transfer surface up to 540 m²


The disc dryer is available in many sizes. A few sizes with their typical characteristics are described below. Please note that these values are indicative only. Detailed information is available on request.

Model (Ø - L) [m] 0.63 - 2 1.25 - 5 1.60 - 7 2.50 - 10
Working volume [m³] 0.6 5.2 12.3 37
Heat transfer area [m²] 11.2 86 189 572
Electric power installed rotor [kW] 4 22 51 110
Evap. capacity ΔT=200°C, U=150 W/m²K [kg/h] 554 4256 9353 28 307

To determine the optimal configuration of the disc dryer for handling your product(s) we maintain a unit at our testing facilities.


Our expert design and engineering team would happily help you specify the right ancillary equipment to compliment your continuous disc dryer(s). These ancillaries may include:

  • Special feeding units
  • Air heaters
  • Dust collectors
  • Ventilators
  • Plant controls including PLC and PC

To determine the optimal configuration of the disc dryer for handling your product(s) we maintain a unit at our testing facilities.

Hosokawa Micron can supply continuous disc dryers as single units and as a complete package. Years of experience in designing complete process installations with all ancillaries are making our company as a valuable partner for the realization of turn-key systems.

We can help you with selection and design of components such as:

  • Special feeding units
  • Air heaters
  • Dust collectors
  • Ventilators
  • Plant controls including PLC and PC

To determine the optimal configuration for handling your product(s) we maintain a unit at our testing facilities.

How can we help you?

To learn more about our powder process equipment, contact us: