Scrubbing Nozzles: Dry
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 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.
For example, in coal power plants, a lime slurry will be sprayed into boiler exhaust to remove sulfur oxides (SOx). The slurry is sprayed finely enough to fully evaporate and leave behind dry limestone powder that reacts with the sulfur oxide and allows it to be removed from the exhaust gas.
Common Designs and Specifications:
Common Nozzle Types: spillback, Air Atomizing
Common Spray Patterns: Hollow Cone
Common Materials: Stainless steel, cobalt alloy 6
Selecting a Dry Scrubber Nozzle:
Droplet sizes must be calibrated carefully so that the droplets are just small enough to fully evaporate. 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.
- Preferred BETE models: SpiralAir, XA, WT, WTX
- Important factors to consider: Residence time of the scrubbing fluid in the gas flow, coverage of the scrubbing fluid, and droplet size.
- Our experienced engineers can help determine which nozzle is best for your application.
- Spray lime slurry into boiler exhaust in a power plant
- Inject food or chemical product into a spray dryer
Typical operating conditions for this application are listed for each nozzle
0.24 to 110 gpm
0.9 to 410 L/min
10:1 High Turndown