isn,t it too large a pressure drop? what is the pressure at the discharge point , or are you using this as a burner feed ?

Marco ■

you wanted to know what we think abouth this system, well you are conveying with a large pressure dop in a small pipe, which means either you are transporting large pluggs or you are going at very high speed which can mean product degradation , but you might not care if this is alrready a very fine product or its final destination is to be used as solids load in rubber or INk,

If the material is abrasive your pipeline mignt be wearing out at the elbows . and depending on the design of your delivery bin you might be having ocasional fires in the cyclone if you convey with air

regards

marco ■

Jim,

With a normal product the situation is like this:

You can convey without degradation, or with minimum degradation, until a certain velocity, where the product breaks down very fast.

The number I use is accumulated impact energy as degradation is a function, at least, of the square of the velocity. Some authors believe it is a cubir formula.

There is a large number of publications in the literature, some are mine, but mine are dedicated specifically to sponge iron and iron ore degradation, and some are not very good.

Now you tell me you have a test rig. Yes, control the velocity of the gas by controlling the flow. In this way you will have a good set of numbers for your final design.

I did that for 8 years, 2 of which were only dedicated to degradation.

We published an article in the International Freight Pipeline Society meeting in Pittsburgh, around 1990. I believe they have the articles available through the internet, or by mail witth a small fee.

Everybody has published something on particle attrition or degradation, so you will find a lot of material. Probably something specific to your material.

My recommendation, do the tests yourself, but be careful when you screen your product to measure degradation, because you might be degrading it!

Take that into account and include a screening factor.

If you need any help, please let me know.

Regards,

Marco ■