I am looking for better technology for collecting fine particles and dust that my plant currently produces. Currently I have many bag houses and find that they consume a lot of compressed air (which makes the electrical bill soar) and the bags are expensive and need to be changed frequently and changing the bags is not an easy task. Any help would greatly be appreciated.

There are several types of dust collectors available that do not require compressed air.  However, the application of these collectors my be limited by your material and/or process requirements.  In addition, there are several other types of filtration devices available that do not require compressed air or bags and may be applicable.

Regarding your bag issues, further detail is required to determine if the bags are failing prematurley.  Some processes require frequent bag changes while others can go for years without changing bags.

Let me know if you would like to discuss your application.

John Mallow
Pesco Inc.
jkmallow@pescoinc.com

Mr. Jenkins,

Depending on how your dust is produced and/or what is the source of it there are a number of ways to look at it and see if it can be reduced and prevented from the start. With out knowing how you handle the material and what might be the source of the dust it is hard to say what we might be able to do for you but if you are interested we provide a wide range of material handling analysis form minning industry and aggregate to power plants were dust is a great issue and has to be controlled and eliminated. We provide a technology based solutions by simulating material flow/handling based on DEM technology to se what the problems are and eliminate them at the source. It might be possible to eliminate/reduce the dust at the source and not have any bag houses or a reduced number.

Please take a look at our webpage(s) www.overlandconveyor.com and www.applieddem.com

They should give you an idea of material flow analysis, chute analysis, numerical modeling, etc...

Best regards,

Grzegorz "Greg" Dewicki
303-716-0569 - Direct

I believe Klaus Schneider's response is the right one - you are probably "over puffing" your bags - wasting air & prematurely wearing them out.
Check timer settings & sequencing - only a few rows should be cleaning at any one time.
I've found controlling with delta P does not work - bags dust loadings get past the point where they can be efficiently cleaned - more time between cleaning is the better answer.
Another item worth checking is the little rubber diaphragms in your Asco or Goyen puffer valves - if perforated, they will pass & waste air - use a stethescope to detect correct puffing - never drill a tell tale "puff" hole downstream of the puffers.
Ensure the correct diaphragm material is selected for your ambient conditions - some are low temp diaphragms.
The puff only lasts 1/25 second - if energized for 1/10 second
this will waste a lot of air - it's the shock wave that cleans the bag, not the volume of air -"less is more".

What you need is a plant inspection. Your system may only need ballanced. Or change the type of bags you use. It is alot of money to spend untill you know what you actualley need.

Call me at work 412-838-1377 and I will see if I cant arrange a plant inspection or find you a cheaper solution than installing a whole new system
mark englert

It is always possible you are undersized or have an excessive can velocity.  These can be addressed by properly designed additional filtration capacity, either in the form of new baghouses or modifications to your existing collectors.  One of your sister plants inherited a flat envelope style pulse jet, which is absolutely unsuitable for a process application like they have.  One of the problems with "compact" pulse jets like cartridges or flat envelopes is insufficient hopper volume.  It is essential to keep hoppers emptied or the dust in the hopper re-entrains, causing excessive pulsing and short bag life.  You might check your material flow against your hopper emptying capacity, i.e. if your airlock and/or conveyor are undersized, there is probably always dust in your hopper, and you undoubtedly have re-entrainment.  You can't go wrong with trying a new timer - it is relatively easy and inexpensive, and it will likely pay for itself very quickly.  Contact me about "proportional cleaning", in which pulse frequency is modified to hold a constant pressure drop.  One of the problems with "hi-low" delta-P initiated cleaning is that pulsing is off (and your material handling system isn't receiving any dust to remove from the hopper) until you hit your high d-P, then you flood the hopper with the first pulse.  This effectively de-rates your material handling system and your ability to keep the hopper clean.  With proportional cleaning, your pulse frequency is proportional to the deposition of dust on the bags, so you are always feeding your material handling system a little bit of dust at a time, as it is collected.  This optimizes the capacity of your material handling system, plus gives you the benefit of optimizing compressed air consumption.  I'd be happy to talk with you about this if you'd like to give me a call.

Rick Brandt
JENKINS & BRANDT
tel:  (770) 650-7295
www.jenkinsandbrandt.com

Correctly sized bag houses will not consume much air for pulse jet cleaning.  5,000CFM baghouse should only consume 8 CFM at apulse.  your differntial pressure gauge controls the cleaning pulse.  You may need new gauges, you might need different bags of cartridge material for the dust.

Have a local rep stop and look at the existing system.

Or contact Bob Hood at Filter Technology.
bob@allaboutfilter.com



Rob@bulkprocessequipment.com
www.bulkpowderpgh.com