Low Flow Gravimetric Powder Feeder
Low Flow Gravimetric Powder Feeder
(OP)
Dear Eng-Tipers,
We are trying to find a device capable of metering fine powder (atomised aluminum-d50=15 microns) on a gravimetric basis at rates as low as 300g/h (10oz/h). Most off the shelf loss-in-weight units we have identified are unable to control at such low flows. The unit is for a process development pilot plant so innovative approaches are also welcome.
Thanks in advance.
We are trying to find a device capable of metering fine powder (atomised aluminum-d50=15 microns) on a gravimetric basis at rates as low as 300g/h (10oz/h). Most off the shelf loss-in-weight units we have identified are unable to control at such low flows. The unit is for a process development pilot plant so innovative approaches are also welcome.
Thanks in advance.
TISM





RE: Low Flow Gravimetric Powder Feeder
RE: Low Flow Gravimetric Powder Feeder
http://www.vibrascrew.com/index.shtml
RE: Low Flow Gravimetric Powder Feeder
Because of the particle size I would chose a system where your (conical)container stands on a weight measuring device, has a small tube inserted to the bottom and the other led onto a small injector(eductor), driven by air or a liquid. You can control the suction rate by the flow rate through the injector (via a pump, pressure controller etc). It is possible to establish a control loop.
A vibratory device will probably densify your material so that the flow will be blocked after some time and you could not aerate it to make it free flowing.
If you can afford some admixtures, bind it to pellets and use a vibrator or make a suspension and feed it as liquid.
m777182
RE: Low Flow Gravimetric Powder Feeder
I am however still open to suggestions just in case these pathways prove unsuitable for this system.
TISM
RE: Low Flow Gravimetric Powder Feeder
Isn't aluminium powder at that size prone to spontaneous oxidation (i.e. combustion).
Could make life interesting.
RE: Low Flow Gravimetric Powder Feeder
TISM
RE: Low Flow Gravimetric Powder Feeder
RE: Low Flow Gravimetric Powder Feeder
www.stockequipment.com
rmw