4 replies to this topic

[SPF]

We are looking to keep the solids in a tank of acid in suspension to avoid settling using a recycle pump into the bottom of a tank. I'm a bit stumped where to start to try and calculate the correct recycle rate to use or to determine what size of jet to use.

Is there any standard design equations for designing a jet mixing system which will allow me to determine the recycle rate and size the nozzle when I have a known tank volume, dimensions, liquid density, suspended solids content and concentration?

Thanks in advance!

[ankur2061]

SPF,

Have a look at this:

http://www.cheresour...or-good-mixing/

Regards,
Ankur.

[SPF]

Thank you very much Ankur.

[Art Montemayor]

SPF:

It is impossible to recommend any specific equations or advice on your suspension application when we have no identifications of the solids involved, their nature, properties, etc.

The way this type of problem was always resolved when I was in the field, was to set up a pilot plant simulation and determine the "extrapolatable" sizes of the equipment needed. A pilot plant result is much more credible and reliable than any computer-generated result.

I interpret your first sentence as meaning that you intend to take fluid from the acid tank (you don't identify the suction nozzle location) and inject it into the bottom of the acid tank using a centrifugal pump. Is that correct? If so, then I would strongly criticize this configuration of re-circulating fluid.

If the basic intent is to keep the solids in suspension, then you should inject at a relatively high level within the acid tank in order to give the solids more residence time within the body of the liquid acid - and not at the bottom of the tank where all the solids want to gravitate to.

[ankur2061]

Thank you very much Ankur.

SPF,

Two more good links on jet mixing:

http://www.idswater.... Jet Mixing.htm

http://www.eng-tips....d=166902&page=1

Regards,
Ankur.