Best wishes for 2017!
We are encountering problems with a lime dosing screw feeder post centrifuge. The screw gets clogged with lime, which increases after each cycle. We stop the screw 5 s after the rest of the equipment to empty out the lime but, because of the moisture, there is always a little left and this results in clogging.
Have you encountered this kind of problem in your facilities? If so, I'd love some advice.
Hello, I would have to know exactly how your system is set up to give you a worthwhile solution. But one thing is for sure: the lime should never come into contact with the water. An isolation valve is often necessary at screw outlet with a flexible sleeve to ensure a proper connection.
If the problem is due to ambient humidity, then a heated coil outside the screw conveyor would help. If that's not enough, then a dehydration station in ambient air somewhere on site.
If it is a problem of water getting in because of capillary attraction between the molecules, then you need to rethink the setup to ensure that water never gets close to the screw conveyor or the lime.
I've installed several valves at output of the screw conveyor, and they have worked well: either a gate or knife valve (Ramus-type stainless steel) or a pinch valve. Opening and closing is directly controlled by the screw feeder motor.