Page 3 - dust collection systems

Pulse Jet Bag Filter (On Off Line)

Bag filters are Dry type air pollution control equipment that

discards suspended particulate matters out of flue gas,

released from material handling or from combustion for

electricity generation or from liquefying hot metals. They are

generally suited to withstand temperatures up to 250°C and

have a particulate accumulation efficiency of as high as

99.99%, even when particle size is in sub-micron range.

Filter bags are suspended from a Tube sheet at the top of the

collector and are internally supported by cylindrical wire

cages to prevent them from collapsing. The dust laden Gas

enters into the Bag Filter through the Hopper or casing by

suction or positive pressure created by the ID Fan

downstream. The heavier dust particles falls immediately

into the hopper after striking the baffle plate while the

lighter dust gets deposited on the outer surface of the

hanging filter bags. A predetermined pulsing cycle is

programmed to energize the Solenoid Valves which dislodge

the dust cake from the outer surface of the filter bags. The

dust falls into the hopper. The filter bags are cleaned either

by time mode sequencing or by differential pressure mode.

Two types of Bag filters are available in the Market – On –

Line type & Off – Line type.

• In an On – Line Bag Filter, bags are cleaned Row by row
even when the dust laden Gas is filtered. The sequence