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Pulse jet dust collector

Pulse jet dust collector

Pulse jet dust collector

I have being assigned to analyze a design of a pulse jet dust collector that is not working properly. The system operates under positive pressure, so it has a fan located upstream of the dust collector, which is fine as long as the centrifugal fan is radial, but I am not sure if that is the right configuration for a pulse jet bag cleaning system. I have spent hours online looking at different systems and I have never seen any pulse jet baghouse with the fan before the dust collector. However, I haven´t found any literature saying that it is not right and the reasons why.

I guess my concern is that I think that if the baghouse is under positive pressure, the compressed air pulse to clean the bag will be counter with the pressure outside the bag, resulting in non efficient cleaning. In the other hand, if the baghouse operated under negative pressure, the air pulse inside the bag would clean the bag better because the pressure outside the bag would be vaccum.

Is there anything wrong with my reasoning? Or is there other reason why I haven´t found any pulse jet baghouse operating under positive pressure?

RE: Pulse jet dust collector

The system you are describing was used a lot in sawmills and feedmills. A paddle fan in the material flow provided the dirty air to the baghouse. The bag was positive to the interior of the baghouse, and negative inside the bag. The pulse was of sufficient intensity to make the inside of the bag positive for a short while, forcing the agglomerated dust off the bag. You might look at the age of your bags, this is a common source of unexplained problems in baghouses.
I have posted a link to a trouble shooting guide for bag houses.

You are judged not by what you know, but by what you can do.

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