What is Sonic cleaning?
Sonic cleaning is used to assist in the cleaning on baghouse dust collectors. Normally, baghouse filters are cleaned either by shaking the bags (shaker), reversing the air flow and partially collapsing the bags (reverse air) or sending a burst of compressed air down the inside of the bag to knock the built up dust off (pulse-jet). Sonic horns in the past were widely used, and thought to be the future of baghouse technology. Now, interest in them has more or less waned, as newer fabrics and improved cleaning designs have proven more effective.
Fabric Dust Collectors
Fabric Collectors (commonly known as a Baghouse) are among the most widely used dust collection systems. They benefit from having the potential to be one of the most efficient (up to 99% of very fine particles) and cost effective dust collection systems you can choose.
The way they work
The Gas stream enters into the Baghouse via the location’s duct system. Once inside the dust filled gases come into contact with the filter bags within. As the gases pass through the filters the dust particles are trapped on the filter media. Over time a layer of cake dust is built up on the surface of the filter bags. This is the secret to this filter medium’s high efficiency potential. Once the cake dust has formed, it further impedes the passage of dust through the filters in four different ways:
• Inertial Collection: The incoming Gas stream strikes the filter media, which is located perpendicular to the Gas flow before changing direction causing the dust particles to remain on the filter.
• Interception: Particles that do not cross the fluid streamlines come in contact with fibers because of the fiber size.
• Brownian movement: By means of diffusion, there is an increased chance of contact between the filter and the dust particles due to their molecular motion.
• Electrostatic Forces: An increased attraction can occur between the dust particles and the filter media when an electrostatic charge is found on the dust particles.
http://www.baghouse.com/2011/02/01/the-encyclopedia-of-filters-dust-collection-systems/
