Products Drying

Continuous Flow Dryer DDU

PETKUS Continuous Flow Dryers Type DDU are designed for drying grain, corn, oilseeds, and free flowing pellets  such as clay mineral and straw pellets. Four models (1500, 2500, 4000, 6000) with capacities from 8 t/h to 110 t/h (based on wheat) are available. The continuous flow dryers of the "DDU"-series use direct heating from oil or gas surface burners.

Product enters the top of the dryer column and flows to the discharge over conical, inverted V-shaped air ducts arranged in an alternating pattern.  During the process the product is continuously mixed and the hot air from the burner is evenly distributed through the product. The required airflow is generated by axial flow fans, positioned on the roof of the exhaust air duct. The air speed can be adjusted using a false air flap within the dryer column. The unsaturated hot air from the lower drying sections and cooling air are drawn in by the recirculation fans and mixed with the hot air thus reducing overall energy consumption. Louver dampers behind the axial flow fans close during product infeed and prevent the discharge of dust into the exhaust air.

Characteristics
  • Model in galvanized sheet steel
  • Low electricity demand
  • Low fuel requirement as the burner is located in the dryer tower
  • Gentle and even drying
  • Operated with gas or oil burner
  • Four models designed for different capacities
  • High thermal capacity and efficiency
  • Conical air ducts increase the capacity by 10-12%
  • Insulated hot air duct
  • Lower energy demand due to air recirculation principle
  • Low dust emission, complies with EU-limits
  • Simple and quick assembly as no scaffolding is required
  • Relatively small floor space
  • Storage tank with level sensor
  • Control cabinet with touch panel and control software
    DDU 15 DDU 25 DDU 40 DDU 60
Length (mm) 7 070 8 340 8 340 9 180
Width (mm) 1 570 2 440 3 890 6 210
Number of sections   9 - 14 10 - 18 12 - 22 13 - 24
Height (mm) 10 885 - 15 335 11 775 - 18 895 13 555 - 22 455 14 445 – 23 434
Output¹ (t/h) 9 - 15 15 - 30 30 - 64 60 - 120

¹ based on wheat, consumer product