Lime dosing screw conveyor
asked 27 January 2017 asked by Tclaire (510 points)
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.
Hello, 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.