In this type, Filter bags are mounted in a common housing. Dusty air enters in the unit from bottom inlet with velocity higher than convey velocity. As it enters in the unit, due to sudden reduction in velocity, most of the particles are being separated from air stream and collected in the bottom hopper. Air moves vertically upwards and passes across the filter bags from outside to inside. Air is being sucked by virtue of high pressure developed due to centrifugal blower located at the terminal end of the system. As filtration continues dust particles deposited over the surface of the filter bags. Over a period of time dust cake is formed over the surface. To remove the cake formation, a high pressure air pulse is being imposed on the filters from inside to outside. This separates dust cake from filter surface and continuing filtration.

Each row of filters are being pulsed in turn in a continues sequence. Pulsing time and ideal time between successive pulses are being controlled with a sequential timer.

Proper selection of air permeability, type and material of filters, porosity of filter, air velocity are the key factor for efficient performance of the unit. Efficiency of centrifugal blower is also plays vital role in overall performance of the system.

Improper design parameters may lead to:

• reduction is suction capacity
• clogging of filters
• detoriate filter life
• inferior dust collection efficiency
• increased cross contamination of pollutants
• Lesser lead time for dust removal from unit
• Increased maintenance of impeller, blower and filters
• Higher dust concentration of dust in outlet.

<< Back