Wet Dust Collectors: Options and Operations

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Courtesy of ProVent, LLC

A wet dust collector comes in the choice of three variations and these are: gas/liquid contact, gas/liquid separation and gas humidification. The difference between the three is based on how the dust is collected and separated inside the system. A wet dust collector, also known as a wet scrubber, depends on how much gas and liquid interacts to brush the dust from the gas. More interaction means the cleaner the medium will become.

Gas/Liquid Contact
When it comes to gas/liquid contact, these come in a total of four subtypes: interception, condensation nucleation, inertial impaction, and diffusion. With the inertial type, water droplets are placed in the way of the dust-laden gas stream, and the gas splits and flows around the liquid. By inertial, particles that are large continue to go straight, come into contact with the liquid and become trapped. After this, they are dropped into a collection tank.

When it comes to interception dust collectors, these rely on a brush off by the particles in a liquid and a gas stream to separate the dust. The diffusion-type collector system drops the water into the gas stream. Dust particles follow the droplets, which removes the dust. Lastly, condensation nucleation cools the gas stream beneath the dew point. Then, liquid condenses on the dust particles and makes them bulkier and heavier; making them easier to remove.

Gas/Liquid Separation
These wet dust collectors apply if you’d like to say a snowball effect, and require as much water and dust interacting. Gradually, the size of each water-drenched particle rises, until it finally falls into a collection bin. A de-misting filter is present in all wet-type dust collectors, as this is where the gas stream passes through in order to eradicate water droplets before the gas returns to the system. In the majority of cases, the more contact between the gas and liquid means more efficient dust removal abilities of the system. Gas/liquid separation wet dust collectors come in a variety of models and during the selection process, you need to consider the inches of the water gauge, as well as the microns of particles you want to remove.

Gas Humidification
This variation of a wet dust collector requires liquid medium to add bulk to (condition) the dust in order for it to be collected and separated effortlessly.

 

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