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Dust Emission Calculation

10/27/2011 9:31 AM

I am trying to use the air induction equation to calculate the dust emission from a transfer point or another kind of falling stream of bulk solids.

QE = 10 × AU × 3 x sqrt( (R x S^2)/D)

Qind = volume of induced air, ft3/min

Au = enclosure open area at upstream end (point where air is induced into the system by action of the falling material), ft2

R = rate of material flow rate, ton/h

S = height of free fall of material, ft

D = average material diameter, ft

Due to the approximate nature of the formula, Anderson recommends that-

Qind = QF

Where:

QE = required exhaust volume, ft3/min

The "explanation" is here:

http://www.osha.gov/dsg/topics/silicacrystalline/dust/chapter_3.html

I have trouble understanding how to find the Au value. For something like a bucket elevator it is easy to consider the area of the inlet at the elevator boot, but what about receiving hoppers? Or even open piles on the ground formed with a stacker belt conveyor?

Does anyone have the original article by Anderson? Can you send me a copy?

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#1

Re: Dust Emission Calculation

10/27/2011 11:07 AM

The original study paper should be here.

I don't know which one of the 17 results it is.

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#2
In reply to #1

Re: Dust Emission Calculation

10/27/2011 2:06 PM

Thank you, but it isn't.

The complete info for the original article is:

Anderson, D.M. "Dust Control Design by the Air Induction Technique," Int. Medicine and Surgery, February 1964, pp.68-72.

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#3
In reply to #2

Re: Dust Emission Calculation

10/27/2011 4:14 PM

It may be here. Look at page 67 forward.

or maybe here. These site the original, but I can't find the actual original.

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#4
In reply to #3

Re: Dust Emission Calculation

10/27/2011 10:30 PM

It may be here. or maybe here. Kramarat please teach me how to attach documents on CR4.

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#7
In reply to #4

Re: Dust Emission Calculation

10/28/2011 6:42 AM

On your post screen you'll see this.

If you want to place a link in your post, highlight and cut the link. I'll use your thread and the word highlight. I dragged my cursor over the word highlight, clicked the little symbol above, and pasted the URL for your thread in the blank box. That's it!

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#5
In reply to #3

Re: Dust Emission Calculation

10/28/2011 2:17 AM

GA.

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#6
In reply to #3

Re: Dust Emission Calculation

10/28/2011 2:27 AM

GA

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#8
In reply to #3

Re: Dust Emission Calculation

11/17/2011 8:51 AM

It wasn't there, but I finally got the article as an interlibrary loan from the University of Chicago.

Now I know where I will send my kids. ;)

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#9

Re: Dust Emission Calculation

09/25/2012 12:34 PM

The applicatio of this equation requires that, the D should be greater than 1/8". What should we do if the D size is smaller than 1/8"?

Please advise me.

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#10

Re: Dust Emission Calculation

09/25/2012 12:37 PM

The Au is the open area at upstream where air was induced into the mass flow to produce dusty air.

Please refer to "Dust Control Handbook" for detailed explanation .

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