Table 4.
Summary of cold gas particulate matter removal technologies (Courson and Gallucci, 2019, Dayton et al., 2019, Prabhansu et al., 2015, Woolcock and Brown, 2013).
| Device | Removal efficiency | Working principle |
|---|---|---|
| Spray scrubber | Particle > 5 mm; 90% Submicron particle; 40% |
Spray nozzles or atomisers disperse liquid into a moving gas stream simultaneously or counterfactually |
| Dynamic wet scrubber | Particle > 5 mm; up to 95% | Use the mechanical motion of fan blades to turbulently mix the water droplets with the gas stream and increase the chances of inertial impaction of particles with water |
| Cyclonic scrubber | Submicron particle; 60–75% | |
| Impactor scrubber | Large particles; >98% | Dirty gas moves through perforated plates or trays on a smaller plate that is regularly washed with water for impaction |
| Venturi scrubber | Submicron particle; >50% | Scrubbers work by reducing the flow area based on the principle of increasing the gas flow, as a results water splits into fine drops |
| Electrostatic scrubber | Submicron particle; around 99% | Water is sprayed into the stream before or after applying an electric charge |