Venturi scrubbers
EnviroAir can provide a venturi scrubber to remove dust from the exhaust air. Our venturi scrubber has a wetted wall venturi eliminating both the wet/dry interface region where buildup often occurs, and the atomizing spray nozzles that are susceptible to plugging. The dust-laden air and water are accelerated in the converging section of the venturi. The water is atomized in the venturi throat and the dust particles collide with and are absorbed by the water droplets.
In a normal profile scrubber, the exhaust air and dust-laden water droplets enter a cyclonic separator through a tangential inlet. The tangential inlet causes the flow to spin through the separator towards the top discharge. The heavy dust-laden water droplets are thrown to the separator wall by centrifugal force where they collect and coalesce. This liquid slurry runs down the separator wall to the bottom drain or integral recirculation tank. The clean exhaust air is discharged out the top of the separator.
Advantages Compared to Wet Scrubbers:
- Cleaned air is returned to machine room reducing winter heating costs
- Lower pressure drop resulting in lower fan horsepower
Advantages Compared to Baghouses:
- Simple design – easy to understand and maintain
- Reduced fire and explosion hazard – no cloud of dust from bag pulsing
Advantages Compared to Conventional Drum Filter Designs:
- Air passes from the inside to outside of filter drum collecting particulate in the inside of drum preventing dust from collecting on the enclosure floor
- Stationary drum has no rotary seal prone to wear and leakage
- More efficient than conventional drum filters results in longer service life for downstream final filters
EnviroAir also offers a low-profile design. Instead of a single cyclonic separator, this design uses multiple cyclonic separators in parallel with a single venturi. The cyclonic separators drain to a common recirculation tank.
The low profile venturi scrubber pictured is removing dust from 22,000 cfm of air exhausted from a paper machine.
