Dust Suppression J D UltraSonics Dry Fog Suppression Systems control virtually all types of less than 5 micron breathable as well as larger size fugitive dust up to 600 microns. Control is accomplished through agglomeration of ultrasonically produced water droplets equal or close to the size of the dust particles. These include silica sand, dried clay, dry sand, limestone, aggregate, road stone, phosphate, coal, quartz, fibreglass and many others. The Dry Fog system suppresses visible emissions from primary and secondary crushing, screening, transfer and loading-unloading facilities such as hoppers, feeders, bins, docks, silos, terminals and vehicles. The sonicom™ atomising nozzle along with a compressed air supply and simple on/off controls will suppress respirable dust as small as 0.1 to 3 microns as well as larger size particles. The initial cost, operation and maintenance of a Dry Fog System is much lower than a ventilation type control system. In contrast to the use of large ducts and related equipment, the sonicom system operates with smaller diameter tubing on as little as 5% of the total energy of conventional systems. Dry Fog systems can be installed for as little as 40% of the installation cost of a conventional bag filter type system. They offer the following advantages:- water consumption averages 18 litres per hour per nozzle nozzles operate on low air and water pressures to eliminate need for pumping systems air consumption approximately 3.75 lt/sec (8 scfm) per nozzle water addition to process, less than 0.1% costly wetting agents and their controls eliminated water source and disposal problems eliminated needs no significant modifications to existing plant for installation low maintenance nozzles are self-cleaning airborne water freezing avoided by producing same size droplets found in clouds Dust Suppression Theory & Application Basic research in the development of the sonicom™ Dry Fog Dust Suppression System showed that if a sufficient number of water droplets of approximately the same size as the dust particles could be produced, the possibility of collision between the two would be extremely high. It was also determined that if the droplet exceeded the size of the dust particle, there was little probability of impact and the desired precipitation. Instead, the dust particle would move around the droplet. The sonicom nozzle assembly is ideally suited for generating a dense fog of ultra fine droplets to envelop and bring down the dust particles at their source. By controlling air pressure, atomisation quality can be varied from course - 200 microns - to an ultra-fine fog of 1 to 10 microns. When the nozzle is complemented with our special water valve assembly, the unit becomes a highly efficient self cleaning atomiser. The heavy duty brass water valve is controlled by the same compressed air supply used to activate the nozzle. A simple on/off signal is required to activate the system and when the signal is removed, the water valve self cleans the nozzle every time by blowing excess water away, significantly reducing lime, salts and chalk build-up. Special nozzle assemblies can also be manufactured to suit specific requirements. This swivel bracket design also incorporates a water pressure regulator to allow for local pressure adjustment ensuring a perfect spray pattern is achieved. Most effective when the water head pressure varies from nozzle to nozzle in a particular installation. a particle size comparison chart [13k]     All rights reserved ©2005 JDUltrasonics Ltd. Another Edoru creation.