Gas Scrubber Systems

A.H. Lundberg provides a diverse range of gas scrubber technologies to effectively, dependably, and economically address air pollution issues and ensure regulatory compliance.

Venturi Scrubber System

AHL’s Venturi Scrubber System has been engineered to efficiently collect fine particulate and aerosols from industrial waste gas streams. Optimal design of venturi scrubbers requires a keen understanding of the desired collection efficiency, particulate mass loading in the gas stream, gas and particle densities, particle size distribution, allowable pressure drop, and site space restrictions.

How the system works:

Venturi Scrubbers incorporate a downflow venturi with a fixed or variable throat, a wet-bottom elbow, and an entrainment separator
The collection principle uses the differential velocity between the waste gas and injected water (or other scrubbing liquid) to create droplets which entrap particulate matter in suspension
Injection of water or scrubbing liquid upstream of venturi scrubbers may also serve to quench hot vapours, if required
The particulate is then extracted as a slurry from the separation vessel of scrubbers for recovery or disposal

Packed-bed Tower Scrubber System

AHL’s Packed-bed Tower Scrubber System is designed to absorb odours, VOCs, hydrocarbons, acid mists, and various organic and/or inorganic contaminants from a process gas stream.

How the system works:

Contaminant-laden gas enters the scrubber tower near the bottom and flows upward through a bed of mass transfer media
Absorption liquid (liquor), selected as appropriate to the process, is distributed evenly on top of the packed bed by a spray header or flooded trough header arrangement
The intimate contact between the liquor and the gas flow results in absorption of the pollutants into the liquor as the gas flows upward through the media bed of the scrubber vessel
Media is selected to provide optimum wetted-surface area in contact with the gas flow (ceramic, metal, or plastic)
An aerosol coalescing and mist elimination section is integrated into the Packed-bed Tower Scrubber at the top of the vessel

Spray Tower Scrubber System

Similar to our Packed-bed Tower Scrubber, the AHLS Spray Tower Scrubber System absorbs aerosols from a process gas stream. However, spray tower is less susceptible to fouling. The trade-off is a slightly lower absorption efficiency.

How the system works:

Within spray tower scrubbers, gas flows upward through multiple spray zones of scrubbing liquid (liquor), to give intimate contact between the liquor and the gas flow, ensuring entrap ment and absorption of the pollutants into the liquor
Spray tower scrubbers will generally include side-stream filtration of the resulting slurry, waste liquor blow down handling and sorbent make-up systems
Hot gas quenching and vapour condensing will also be included in the system, if necessary

Wet electrostatic precipitators may be integrated into the top of absorption scrubbers to achieve enhanced removal and control of sub-micron aerosols and particulate matter.