Wet dust separator

Application

• Removal of dust and particles from gas flows:

  • AlCl₃, NaCl, Ca(OH)₂, …

  • cocoa powder

  • metal powder

  • phosphate powder

  • pigments

  • incineration residues

  • peroxide fumes

  • …

Principle

The fan is positioned after the wet dust separator and is the only component with moving parts in this scrubber technique (no pump needed).

The waste gas enters the scrubber through a vertical channel. The negative pressure creates a gas stream which flows along a curtain of water. This curtain is formed along a partially submerged baffle plate. Due to the high gas velocity and the strong turbulence at the liquid surface, water droplets are mixed with the waste gas, ensuring thorough washing and wetting of the dust particles.

In a second phase, the waste gas passes through a labyrinth. Due to the specific shape of this part of the scrubber, the waste gas makes several rotations which force the dust particles to penetrate the water droplets and to become entrapped. At the same time, the centrifugal force in the labyrinth provides optimal separation of the wetted particles. Under influence of gravity, the particles collect and settle in the fluid reservoir.

The last phase is a demisting action. If still some particles or water droplets are present in the treated waste gas, they will be retained in the demister. The demister mainly functions as a back-up and can easily be removed for cleaning. Only when the wet dust separator is not working properly (e.g. insufficient wash water), the demister will have to be cleaned regularly.

Although chemicals can be added, normal water is most often used as a scrubbing liquid. For the proper functioning of the wet dust separator, it is very crucial to maintain the correct liquid level in the scrubber tank and to induce a periodic partial liquid drainage/refreshment.

Contrary to bag filters, wet dust collectors can obtain an optimal removal of sticky or hygroscopic dust particles. Moreover, there is no risk of dust explosions and the collected dust particles can be recovered through the wash water (e.g. for metal recovery).

Scheme

Realisations