Alfa Laval MMPX 303SGP-11, Руководство пользователя

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3.1 Basic principles of separation 3 Separator Basics
16
3.1 Basic principles of
separation
The purpose of separation can be:
•
to free a liquid of solid particles,
•
to separate two mutually insoluble liquids with
different densities while removing any solids
presents at the same time,
•
to separate and concentrate solid particles
from a liquid.
Separation by gravity
A liquid mixture in a stationary bowl will clear
slowly as the heavy particles in the liquid mixture
sink to the bottom under the influence of gravity.
A lighter liquid rises while a heavier liquid and
solids sink.
Continuous separation and sedimentation can be
achieved in a settling tank having outlets
arranged according to the difference in density of
the liquids.
Heavier particles in the liquid mixture will settle
and form a sediment layer on the tank bottom.
Centrifugal separation
In a rapidly rotating bowl, the force of gravity is
replaced by centrifugal force, which can be
thousands of times greater.
Separation and sedimentation is continuous and
happens very quickly.
The centrifugal force in the separator bowl can
achieve in a few seconds what takes many hours
in a tank under influence of gravity.
The separation efficiency is influenced by
changes in the viscosity (separating temperature)
and in the throughput.
G
0
01
071
1
Sedimentation by gravity
G
0
010
81
1
Sedimentation in a settling tank, with outlets making it
possible to separate the lighter liquid parts from the
heavier
G
0
0
109
1
1
The centrifugal solution
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