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dust collector versus blower motor
3

dust collector versus blower motor

dust collector versus blower motor

(OP)
We are processing dry drywall in a American Pulverizer WSR40 Hammermill, 125hp/1780rpm. We attached a Torit dust collector to the discharge area which is 5hp/3,450rpm. The torit is 15ft away and 15ft off the ground. The ducting we are using is 8" diameter metal furnace ducting.
The problem we are having is a lot of the dust & paper is blowing back up through the top of the opening. We recently mounted a blower fan to the top that runs 3480 rpms thinking that if we added downforce that would help by making an air curtain. This didn't help either.
Looking for any information to help solve this problem.

RE: dust collector versus blower motor

1. WHAT IS THE AREA OF THE DISCHARGE AT THE PULVERIZER THAT YOU ARE TRYING TO COLLECT??
2. WHAT IS THE SIZE OF THE DISCHARGE STACK DOWNSTREAM OF THE TORRIT??
3."through the top of the opening"-ARE YOU REFERRING TO THE PULVERIZER??
THERE ARE MANY POSSIBILITIES:
a. The fan is not sized correctly
b. The ductwork is sized incorrectly
c. The face velocity at the collection point is sized incorrectly.
d. The stack is sized incorrectly

RE: dust collector versus blower motor

Capture velocity and hood design seem to be the likely culprits.

When looking into hood design 'Industrial Ventilation' should get you started.

The rpm of the dust collector and fan don't help with information, the CFM (volume flowrate) would be much more helpfull.

Just a comment though: 125hp motor pulling through 8" diameter furnace duct, I'm surprised you haven't collapsed the duct yet. Does this dust collector serve other hoods, or just the one?

RE: dust collector versus blower motor

CBSPyro (Materials)
If your dust collector is a bag house with reverse pulse jet, have you checked the settings on the reverse.
 You may be getting too much back pressure from agglomeration of the drywall dust on the bag house sleeves.
B.E.

To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.

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