Case study

Centrifugal fans and coulisse dampers for a drying process

One of our customers, a company specialising in development, construction and maintenance of thermal drying processes received a question from a customer of theirs from the wood industry. Wood chips and sawdust are a source of energy, provided they are sufficiently dried and packaged in a manageable manner. So our client was commissioned to develop a dryer suitable for drying wood chips and fibres sufficiently on a belt dryer. The moisture in the wood chips is reduced so that it can be packed and transported better. This dryer was to be heated using a biofuel-fired furnace.

Input moisture concentration of the material was 55% and output moisture concentration only 12%. The dryer has a capacity of 7500 kg per hour.

Solution through 3 centrifugal fans and coulisse dampeners

Therefore, to carry out this drying process efficiently, sufficient air is needed to dry the material efficiently. It was decided to manufacture the heavy-duty centrifugal fans entirely from steel. Due to the high relative humidity in the medium, the choice was made to apply a high-quality customer-specific coating system suitable for this medium.

In this project, a low noise level was desired for the house radiation and appearance in the press side. To achieve this, centrifugal fans with a low 6-pole speed and adapted material thicknesses were chosen. To reduce the noise level in the press side, coulisse dampers, manufactured entirely from stainless steel 304, were chosen.

Specifications centrifugal fans

Volume: 100,000m3/h |Static pressure: 1420Pa 

  • WEG E motor 75kW/6p/IP65/C5 coating/NU bearings/insulated bearing shield 
  • 2-fold split casing for easy maintenance 
  • inspection doors 
  • condensation drain 2″ 
  • shaft sealing with carbon rings 
  • speed sensor with detection ring 
  • fan made of S355J2/S690QL 
  • class IIV impeller made of stainless steel 304 
  • impeller fitted with counter blades 
  • special coating system for steel parts 
  • cooling impeller with protective cover 
  • fixing materials SS304 
  • impeller balanced according to G2.5 including balance report

Specificaties coulisse dampener

  • dimensions 2200x1750x2500
  • housing and flanges of SS304, fully welded
  • housing for wings made of 304 stainless steel
  • 6 absorption/reflection covers
  • removable wings
  • inner perforated plate of SS304
  • Internal membrane due to high RH
  • coated on the outside for aesthetic reasons
Centrifugaal ventilatoren voor droogproces
Centrifugaal ventilatoren voor droogproces

Also in need of centrifugal fans for drying processes or another solution? Contact us!

Slingerland Techniek understands that it is difficult for companies to indicate exactly what they are looking for. To provide companies with the best possible service, we look at the business situation together. The possible solutions are then discussed so that we can solve your business problem in full consultation.

Do you recognise yourself in this problem and would you like to discuss your own situation with our specialists? Then contact us today!