Pneumatic Conveying of Expanded Perlite

Posted in: , on 24. Apr. 2014 - 16:15

Good day,

Is there anyone that could maybe assist me with the following problem please?

I work for Afrox and we use expanded perlite in our cold box as insulation material, I am budy trying to design a pneumatic system to vacuum the perlite out and the reverse the process to fill the cold box again with new perlite. This system should be transportable to use on our different plants.

The main problem I am having is selecting a system and then designing it because of the bulk density of the bulk perlite. From most of the literature I have read there are no information on conveying bulk material with such a low density. The physical properties of expanded perlite are the following:

Bulk denisty loose fill = 40-55kg/m3

Bulk density compacted = 50-76kg/m3

the particle size ranges from less than 250 microns up to 1000microns.

I am not sure of what the conveying velocity can be for this system, perlite is a very abrasive material and we have had leaks in the cold boxes that have fluidized the perlite causing the pipes to be to be damaged severely.

Can anyone please assist me with this in giving me a bit of direction thank you

angle of repose is 41degrees ■

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Re: Pneumatic Conveying Of Expanded Perlite

Erstellt am 29. Apr. 2014 - 03:59

Tiaan,

For such highly abrasive materials, it is important that the conveying velocity is in the dense phase conveying regime. Low bulk density materials that do not pack up under pressure can be conveyed in dense phase mode. You can run a compressibilty test on Perlite to determine this property.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting ■

Dear Tiann, Can You Give A Detailed Description Or The Fowchart…

Erstellt am 30. Apr. 2014 - 06:49

I suggest that the solid-gas ratio should be less than 1.5, 10m/s as the initial velocity of conveying is enough. ■

Dear Tiaan, Can You Give Me A Detailed Introduce Or Flowchart O…

Erstellt am 30. Apr. 2014 - 06:55

I suggest that 10m/s as the initial velocity should be enough, and the solid-air ratio should be less than 1.5 ■

More Information On The Process

Erstellt am 20. May. 2014 - 08:59

Hi sea-will I added a attachment of the process.

We would like to remove the perlite at 20m^3/h which is about 900kg/h.

Attachments

design (PDF)

■

Re: Pneumatic Conveying Of Expanded Perlite

Erstellt am 20. May. 2014 - 09:02

design

Quote Originally Posted by sea-willView Post
I suggest that 10m/s as the initial velocity should be enough, and the solid-air ratio should be less than 1.5

I attached a diagram to ilistrate what we want to do.

We would like to remove the perlite with a mass flow rate of about 900kg/h ■