How a Wet Scrubber or Venturi Scrubber Works
Below is an infographic on how a wet scrubber works. This venturi scrubber is designed to do what it is supposed to do, remove pollutants from gas streams. At AirPol, we are able to design a wet scrubber that fits your needs.
How the AirPol Venturi Scrubber Works
- Dusty exhaust gas enters the flanged Venturi Scrubber Inlet connection via ductwork from the process/emission source.
- Tangential Feed Pipes introduce scrubbing liquid supplied by the Recycle Pump. These are straight open pipes with no use of any spray nozzles that could plug and erode.
- The scrubbing liquid that is introduced swirls down through the Venturi Converging Section with a “dentist bowl” effect, providing the liquid for atomization and protecting the surfaces from both abrasion and build-up. The gas stream is accelerated due to the reduced cross-sectional area.
- Additional Radial Liquid Feed Pipes introduce more scrubbing liquid to ensure complete coverage of the round cross-section Venturi Throat.
- In the Mixing/Collision zone particulate is captured in the scrubbing liquid droplets created by the exhaust gas stream accelerated in the Venturi Scrubber.
- Pressure drop (related to exhaust gas velocity) across the Venturi Throat determines the collection efficiency achievable. Higher pressure drops allow greater collection efficiency. To accommodate fluctuating exhaust gas volumes, a damper is used to adjust the throat cross-sectional area to maintain operating pressure drop (for a constant efficiency)
- A long generous Diverging Section below the Venturi Throat promotes extended contact time for the particulate and scrubbing liquid and assists with pressure drop regain.
- The gas/liquid mixture turns and enters the Cyclonic Separator Inlet where it is accelerated into the spin zone. The entrained scrubbing liquid with captured particulate is removed via centrifugal force and drains to the bottom recycle sump section of the Separator vessel.
- A liquid reservoir in the bottom of the “Flooded Elbow” serves to cushion impact and prevent abrasion of metal surfaces.
- The scrubbing liquid with captured particulate drains to the Recycle Pump for recirculation back to the Venturi feed pipes while a small portion (“bleed”) is removed for disposal or treatment.
- Anti-Spin Baffles stop the gas spin and straighten the flow before the cleaned exhaust gas exits the Separator to an Exhaust Stack or ductwork.
- Cleaned exhaust gas exits the flanged Separator Outlet connection.