Glossary
HRSG and gas path
Venturi scrubber
Also known as venturi wet scrubber.
A Venturi scrubber is a high-energy wet scrubber that atomises scrubbing liquid into a high-velocity throat where the liquid droplets intercept and trap fine particulate. The cleaned gas-and-droplet stream then passes to a downstream cyclonic separator that knocks out the wet droplets.
Applications
- Blast-furnace gas cleaning (after the dust catcher, before wet ESP)
- Hazardous-waste incinerator off-gas
- Chemical and pharmaceutical process exhaust where sticky aerosols defeat dry collection
- Pulp-and-paper recovery-boiler vent-stack scrubbing
Sonic-horn relevance
Venturi scrubbers themselves are continuously wetted and rarely benefit from acoustic cleaning. However, the upstream dust catcher and the downstream sludge handling hoppers do — sonic horns at those points prevent the sludge bridging that interrupts scrubber operation.
Related terms
Related terms
- Dust catcherA dust catcher is a large vertical inertial separator used in blast-furnace gas cleaning to remove coarse particulate before downstream wet scrubbers or fabric filters.
- Wet electrostatic precipitatorA wet electrostatic precipitator continuously washes its collecting surfaces with water, used for sub-micron particulate, acid mist and sticky aerosols downstream of FGD or biomass scrubbers.
- Electrostatic precipitatorAn ESP removes particulate from flue gas by charging dust and collecting it on plate electrodes. Sonic horns are widely used to dislodge ash from plates and to keep hoppers from bridging.