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Disc Centrifuge- Engineering Lab Training Systems.
Technical Description
A disc centrifuge can be used to separate mixtures of non-inter-soluble liquids.
The
emulsion to be separated is prepared in a stirred tank. Water/oil is
recommended for use as the emulsion. A stirring machine with a speed
control mixes the two liquid phases. In the course of the mixing process
the oil droplets are distributed ever more finely in the water. When
the droplet sizes are smaller the emulsion remains stable for longer.
A
pump delivers the emulsion up into the centre of the rotating
centrifuge. The emulsion is delivered by way of the distributor base via
riser ducts into the disc intermediate chambers. The driving force of
the separation process is centrifugal force. It ensures that the
specifically heavier liquid particles (water) are drawn more strongly
towards the outside than the specifically lighter liquid particles
(oil). The settling distance and time are shortened by the disc
arrangement set at an oblique angle to the field of acceleration. On the
underside of the rotating discs the specifically heavier portion of the
emulsion moves downwards and outwards. The lighter portion flows
inwards on the top side of the discs. The separated liquids exit the
centrifuge by way of outlets and can be collected in tanks.
The
rotation speed of the centrifuge can be adjusted by way of a
potentiometer. A valve is used to adjust the flow rate of the emulsion
due to be separated.
Various types of stirrer are available to
perform the stirring. A photometer is recommended for analysis of the
separated fractions.
The operating and service instructions form the
basis for learning how to perform an extensive range of maintenance and
inspection operations on the centrifuge.
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