Wet dust separator
A wet dust separator is a compact wet scrubbing technique designed to remove dust and particulate matter from gas flows by combining intensive washing, particle capture and demisting. It is particularly effective for sticky or hygroscopic dusts and can also support safe recovery of captured particles through the wash water.
Why choose a Wet dust separator?
Removal of dust and particles:
- AlCl₃, NaCl, Ca(OH)₂, …
- cocoa powder
- metal powder
- phosphate powder
- pigments
- incineration residues
- peroxide fumes
- …
Dust and particles treated with wet separation
How does Trevi's Wet dust separator work?
A simple system with minimal moving parts
The fan is positioned after the wet dust separator and is the only component with moving parts in this scrubber technique (no pump is needed).
Washing and wetting of dust particles
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.
Particle capture in the labyrinth
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 the influence of gravity, the particles collect and settle in the fluid reservoir.
Demisting of the treated gas
The final 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.
Scrubbing liquid management
Although chemicals can be added, standard water is most often used as a scrubbing liquid. For the proper functioning of the wet dust separator, it is crucial to maintain the correct liquid level in the scrubber tank and to induce a periodic partial liquid drainage/refreshment.
Benefits compared to dry dust collection
Unlike bag filters, wet dust collectors can obtain an effective 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).
Related air treatment techniques
Biological
Additional techniques
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