Continuous flows of air or gases that are generated by industrial fans do find a wide range of applications in almost any field in an industrial setup. The generated continuous flows can be used for varied purposes such as cooling, ventilation, combustion, aeration, particulate transport, exhaust, air cleaning, drying and a host of many other applications. Many industries do find this particular air flow technique to be of vital importance and some of the examples of industries served by this air flow principle do include metals manufacturing to aid in rapid cooling processes, cement production for cleaning as the continuous air or gas flow is very efficient in blowing up dusts, mining, food processing, power production and cryogenics.

Centrifugal Fans

WDB offer centrifugal fans in the following specifications;

BL – D – HPHE – backward inclined blades
  • volumes up to 1,000,000m/hr
  • pressures up to 2100mm swg
  • temperatures up to 700°c
  • efficiencies up to 76%

 

BA – DA – backward inclined aerofoil
  • volumes up to 1,000,000m/hr
  • pressures up to 2100mm swg
  • temperatures up to 400°c
  • efficiencies up to 86%

 

LM – MV – DVFC – forward curved
  • volumes up to 100,000m/hr
  • pressures up to 200mm swg
  • temperatures up to 400°c
  • efficiencies up to 65%

 

DVRC – radial curved
  • volumes up to 100,000m/hr
  • pressures up to 200mm swg
  • temperatures up to 400°c
  • efficiencies up to 65%

 

HPR – radial
  • volumes up to 12,000m/hr
  • pressures up to 4200mm swg
  • temperatures up to 400°c
  • efficiencies up to 65%

 

PB – HBBP – paddle blade
  • volumes up to 100,000m/hr
  • pressures up to 500mm swg
  • temperatures up to 49
  • efficiencies up to 55%

 

The industrial fans used to create the continuous air or gas flows can be classified as either axial or centrifugal fans. The classification is based on how the given industrial fans work and also on the components which they may have been built from. Centrifugal fans principle of operations is usually governed by a rotating disk having blades mounted at right angles to the disk. This kind of arrangement helps to impart the needed movements of gas or air molecules while at the same time creating a pressure difference which will facilitate the intended continuous flow.

These types of fans do comprise of an assembly of disk, blades and the hub; and these often do provide aerodynamic as well as some structural functions. The fan wheel is contained in a small housing with takes the shape of a scroll which does resemble the shell of nautilus creature. The air or gas molecules found inside the rotating fan is usually thrown to the outside of the fan wheel to an outlet which is based at the fan’s housing larger diameter. This helps to simultaneously draw in more gas or air molecules into the fan wheel through the centrally placed wheel. The inlet and outlet gas or air molecules ducts are in most cases attached to the centrifugal fan housing and the purpose of this is to ensure that the supply or exhaust of the gas or air is done as per the industry requirements.

Axial fans on the other hand do employ the principle of axial forces so as to achieve the required movement of air or gas molecules. The design does comprise of a rotating central hub have blades which are radially extending towards the outer diameter. The do cause the fluid molecules to move parallel to the axial fan’s wheel or the axis of rotation. The wheel of an axial fan is usually contained within the small section of the ductwork to which connection to the inlet and outlet is made. For axial fans, the fan wheels do have diameters which typically do range from 0.3 meters to over 9 meters though the fan wheels of axial towers may exceed 25 meters in their diameter range. Generally, axial fans are applied when there is main need is to supply large volumes of gas or air flows while for centrifugal fans they are put in place when the principal requirement is to have considerably high pressures accompanied by large volume flow.

quick-desktop