powered by: Redaktion BSH (BulkSolidsHandling)
The powder flow in a silo or bunker is frequently stopped by channelling, piping or bridging. But the flow can be promoted using an additional energy input by mechanical vibrations.
The production of ultrafine powders requires reliable powder storage and handling equipment. The powder flow in a silo or bunker – normally driven by the force of gravity – is frequently stopped by channelling, piping or bridging.
As a solution of this serious problem, the gravity flow can be promoted using an additional energy input by mechanical vibrations. Vibrating hoppers can avoid bridging and channelling and the powder can be discharged with the flow profile “mass flow”.
Due to the mass flow pattern the powder is on continuous slow movement and the dust emission is reduced. Also the discharge rate can be controlled by pulsating operation of the vibrating hopper. It is possible to predict necessary operating and idle periods (pulsed operation) by calculation of the discharge velocities at the annular gap of a vibrating hopper and at the outlet. To prove the change of flow pattern from funnel flow into mass flow and the calculation, experiments on the silo scale are carried out.
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Published: 07/27/2010 | Redaktion BSH (BulkSolidsHandling)