Page 32 - dust collection systems

advanced cleaning system, as pulse is injected directly into
the bag, secondary air flow is just 1-2 times the primary air

flow.

As the filter media is not flexed as extensively as in the

traditional cleaning system, low pressure (20 to 40 psi)

advanced cleaning system increases life of filter bags.

However, the conventional cages cannot be used in advanced

cleaning system as there is a tendency for them to bend due

to the excessive length. Higher thickness wires are used for

cages when the height of bag or cage is 6 m or more. This

higher thickness ensures straightness (spacing between

bags) of the bags which are freely suspended from the tube

sheet.

The critical factor for providing thorough bag cleaning and to

prevent damage to venturis and bags is to make sure that the

hole/orifice/nozzle in the blow pipe (compressed air

manifold) are properly aligned above the filter bags. The

holes should also point straight into the bags. if holes of the

blow pipe are not properly aligned above the filter bags, it

may damage venturis. Rotation of the blow pipe could cause

the compressed air pulse to strike the side of the bag near