Filter Bags are in general frequently used for dust removal in industrial applications. The flow can be from the outside to the inside of the filter (that means the separation of particles happens on the external surface of the filter) or the other way around, depending on the application. The particles are normally captured on the internal surface of the bag filter.
Filter Bags are in general not designed for replacement when they are clogged, but some bag filters for gaseous applications like dust removal can be cleaned, for example by mechanical shaking or by backwashing with compressed air.
Filter Bags are in general designed for applications with a desired filtration rate from 1 to 1000 micron.Filter Bags generally fall into one of the following categories:
In Pulse Jet and Plenum Pulse systems, the dust is collected on the outside of the filter bag and the clean air exits through the inside of the bag. The bag is supported by a wire cage to prevent the bag from collapsing during operation.
In a 'Top Load' system, the bags and cages are installed from the clean air side of the cell plate while with 'Bottom Load' they are installed from the dirty air/hopper side of the unit.
ln Shaker and Reverse-Air cleaning systems the dust is collected on the inside of the filter bag. Since the bag is inflated with the air/dust stream, support cages are not required. The filtered air exits through the outside surface of the bags. Many configurations are available to suit the needs of most dust collectors.