Dry Scrubbing Nozzles
Remove contaminants from gas streams with a finely atomized solution that fully evaporates within the gas stream leaving only a dry residue.
In dry scrubbing, a much smaller amount of scrubbing fluid is sprayed into the gas flow than in a corresponding wet scrubber system. The intent of a dry scrubbing system is to limit the volume of fluid injected so that the liquid component evaporates completely, leaving either a gaseous or solid component that will react with the contaminant and allow it to be removed from the system.
These systems are frequently used to remove acid gases from combustion streams through injection of an alkaline slurry. For example, in coal power plants, a lime slurry will be sprayed into boiler exhaust to remove sulfur oxides (SOx). The flue gas is hot enough and the slurry is sprayed finely enough to fully evaporate while reacting with the flue gases to neutralize the acid and form solid particulates that can be more easily removed from the exhaust gas.
Selecting a Dry Scrubbing Nozzle:
Important factors to consider:
- Scrubber duct size, velocity, pressure, temperature, and fluid composition
- Required coverage
- Nozzle mounting location and orientation
- Required droplet size
- If they are too small they may be swept away, especially in a fast moving gas flue.
- If they are too large, they may not fully evaporate, leaving a wet residue on the walls of the scrubber that can harden and build up over time.
- Available residence time for droplet evaporation
- Required materials of construction for corrosive environments
- Spray media density and viscosity
- Required scrubbing fluid flow rate
- Available pressure drop (∆P) across the nozzle
- ∆P = supply pressure at nozzle inlet - process pressure outside nozzle
- Availability of compressed air or other gases for atomization
- Our experienced engineers can help determine which nozzle will perform as required with your design details
Common Dry Scrubbing Nozzle Uses and Industries:
- Air atomizing nozzle with external-mix design provides independent control of flow rate and drop size
- Wide variety of hardware configurations
- Available with clean out and shut off capabilities
- Nickel alloy and other 300 series stainless steels available by request
- Nozzle Type(s):
- Air-atomizing nozzles allow for fine atomization at low operating pressures
- Ideal for low flow rates and higher viscosity spray media
- Spray Pattern(s):
- Full Cone
- Angle Range:
- 10 - 30°
- Common Materials: