Fluid Bed Drier
I think you are trying to turn your Drier into a fluid bed separator. It certainly works. You have to balance the particle weight with the air flow. This is a fairly common approach in the fluid bed industry.
Some experimentation will be required. I would recommend you set up some sort of laboratory scale test and try it out.
John.Rz http://www.mets.net.au ■
Re: Separation By Rotary Drier
Crude classification certainly works in a fluid bed but I would be surprised if you can get it to work in a horizontal rotary dryer. The horizontal velocities are very low.
In addition, most rotary dryers are counter current so you would be sending the dry fines back thorugh the wet inlet area. Most people want to keep as much material as possible in the dryer and not lose product in the gas stream. One of the norrmal advantages of the counter current system is that any dry product which is carried along the dryer has a high probability of contacting and sticking to the wet product at the inlet end. If it does it is removed from the gas stream and retained in the dryer. Good for most applications but unfortunately not so good for your classification process. ■
Re: Separation By Rotary Drier
Thanks RPD,
My rotary drier is co-current and the humidity is very low so I do not worry about interferance of wet material.
Thanks
Amit
NIM
amit@nim.co.il ■
Separation by rotary drier
We are thinking of using our rotary drier to separate out the minus 100 microns from our product which is : 40% minus 100 microns, 40% 100-800 microns, 20% 800-3000 microns. Through the drier we have an air flow rate of 20,000 m3/hr , it's diameter is 1.4 m . The separation efficiency is not so critical as we have a classifier to fix the 100 microns to a sellable product.
Has anyone tried it or has an idea if it can work?
Amit
NIM
amit@nim.co.il ■