Lim,

What U needs to know is:

de-dusting (take off ) volumes required for your application.

gas temperature and other data.

reccomended air-to-cloth ratio for saw dust - expressed m3/m2/min or in another words the filtration velocity thru the fabric.

"can" velocity ie the updraft dirty air gas velocity in between the bags - to high means re-entrainment of the collected dust..

arch or bridging dimension for the collected saw dust - do not want it hanging up in the discharge hopper.

hopper valley/wall angles - for free flow of the collected dust downwards to the discharge device.

pulse jet uses compressed air, the bags get a fair pulse on each cleaning cycl,e

HP fan is reverse air - more gentle on the bags (longer life) - has one more drive plsu the travel drive.

a pulse jet is common and would do the job for U.

Reputable suppliers should be able to quote units for U.....just compare all the key parameters as above..

Cheers.

James ■

Recommended air-to-cloth ratio for "reverse air" high pressure cleaning fan collectors is generally less than for pulse cleaqning units (more cloth area). The first type is good for fine dusts, say metallurgical and hot, moist applications because the reverse air can be heated to prevent condensation on the bags.

For ordinary sawdust, I would use a pulse cleaning unit, bags no more than 3.6 m long, with generous spacing between them to avoid hang-ups.

Bag spacing is very important for MDF dust which has bad hang-up tendencies. Larger spacing reduces can velocity. Certain baghouse designs feed the dusty air into the side of the casing instead of into the hopper. This gives cross flow and reduces the significance of can velocity.

Filtration velocity (air-to-cloth ratio) max. 8 ft/min. in the old units.

Depending on the size of the unit, its location (inside/outside) you may need to consider explosion risk. That is, spark detection and quenching systems and explosion vents.

Regards,

Michael Reid. ■

Greetings from the USA,

I guess if I was looking to purchase equipment for this I would seriously look at a high volume vacuum system with a cylone receiving hopper to act as a dust collector/ no fuss, no mess, no bags. you would also have the option of droping it directly in an open top container or the ground-my two cents.

lzaharis ■