Selection of nozzle for dust suppression and control system is very important which is based on type of material, spray angle, operating pressure, surface wetting on the material and moisture content that can be added to the material
SPRAY ANGLE SELECTION
The spray angle of the nozzle, which ranges from 0° to 175°, is dependent upon the application, including spray pattern, the number of nozzles used and nozzle placement.
OPERATING PRESSURE
The ideal operating pressure is dependent upon many application-specific variables. However, these basic principles should help you decide:
• Increasing pressure decreases drop size
• High-pressure sprays are better suited for enclosed areas
• Nozzles operating at higher pressures should be placed close to the dust source to minimize the amount of air set in motion along the spray path
SURFACE WETTING
To increase surface wetting, use nozzles that produce
a large number of small drops and decrease the contact angle of the spray on the material.
Impact, which is influenced by operating pressure, also can increase surface wetting. Keep in mind that drops normally travel through turbulent air before they hit the material.
Friction drag of air reduces the impact velocity as the water travels away from the nozzle orifice.
| SPRAY NOZZLE TYPE | SOLUTION | APPLICATIONS | FEATURES |
| HOLLOW CONE | Dust Prevention/ Airborne Dust Suppression | • Transfer Points • Transport Areas/Roads • Jaw Crushers | • Large nozzle orifices that reduce clogging • Small drop size – generally smaller than other nozzle types • Typically used in locations where dust is widely dispersed |
| FLAT SPRAY | Dust Prevention | • Stockpiles | • Small- to medium-size drops • Typically used in narrow or rectangular enclosed spaces |
| FULL CONE | Dust Prevention | • Stackers, Reclaimers • Transfer Points | • High velocity over a distance • Medium- to large-size drops • Commonly used when nozzles must be located a good distance away from the area where dust suppression is needed or to clear mechanical obstructions |
| AIR ATOMIZING | Airborne Dust Suppression | • Jaw Crushers • Loading Terminals • Primary Dump Hopper • Transfer Points | • Small drops • Commonly used to capture small dust particles in enclosed areas to minimize drift |
| HYDRAULIC FINE SPRAY | Dust Prevention/ Airborne Dust Suppression | • Stackers, Reclaimers • Stockpiles • Transfer Points • Jaw Crushers • Loading Terminals • Primary Dump Hopper | • Small drops • Commonly used to capture small dust particles in enclosed areas to minimize drift |
