Design of Fly Ash Bin with 3 Outlets

Posted in: , on 12. Jul. 2006 - 05:57

Fly Ash dozing from an bin

We have an existing rectangular bin ( 6500 x 4000 mm) with a flat bottom.

- The height of the rectangular portion 5800 mm.

- The height of the bin bottom 1200 mm.

Fly ash is absolutely dry with no moisture

As per our calculations, the bin has a volume of 120M3. Wemer want to have 3 dozing systems at the bottom of this bin to feed to 3 cement mills. The maximum dosing capacity of each system will be 40 TPH (Operating 30 TPH). All the 3 systems will be running continuously.

We have the following queries :-

1.0 Is it possible to safely operate 3 outlets from this bin

2.0 Is aeration absolutely necessary for assisting flow, will fly ash not flow without aeration.

3.0 What is the minimum level we will have to maintain to obtain the capacity

4.0 Do you recommend bin bottom aeration and extraction thru air slides OR mechanical agitator is recommended with screw feeder (which is most suitable type of aeration for fly ash bin). ■

Feeding & Dosing
Handling
Screw Feeders
Mechanical Feeders
Futtermittel & Getreide
Cement
Nichtmetallische & Mineralische Produkte
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Re: Design Of Fly Ash Bin With 3 Outlets

Erstellt am 12. Jul. 2006 - 02:02

This sounds like a Goldfields job, find a bit of scrap & make it fit.

What is the bin doing at the moment? Is there even a bottom opening? Ignoring the surcharge ullage there is 1 hour's retention at most.

Anyway

1) Yes; why not?

2) Not worth it with that size of bin. Use a rubber mallet.

3) What capacity might that be?

4) Screw feed with polymer based mechanical agitator as described in 2) above. ■

John Gateley johngateley@hotmail.com www.the-credible-bulk.com

Re: Design Of Fly Ash Bin With 3 Outlets

Erstellt am 13. Jul. 2006 - 04:52

Is your bin fed by pneumatic conveyor?

Years ago we retrofitted 4 flyash bins about 14 ft dia x 25 ft high which were fed by a pneumatic conveyor. We installed a chisel bottom in the bin to increase the opening size and fed out with one 24" dia mass flow screw so that material would come out.

Then we put a rotary feeder after the screw to be able to make the material stop because somedays once the flow started, it wouldn't stop as it had become aerated and flushed through the screw. The less retention time in the bin, the more chance of getting aerated mateial at the outlet.

If you use three screws, make sure there is some trough shape between them or you may get nasty surprises.

In my experience don't use air, just big screws and brute force. ■