Alfa Laval MMPX 303SGP-11, Руководство пользователя

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3.1 Basic principles of separation 3 Separator Basics
18
Phase proportions
An increased quantity of water in a oil will
influence the separating result through the
optimum transporting capacity of the disc stack.
An increased water content in the oil can be
compensated for by reducing the throughput in
order to restore the optimum separating
efficiency.
Size and shape of particles
The round and smooth particle (A) is more easily
separated out than the irregular one (B).
Rough treatment, for instance in pumps, may
cause a splitting of the particles resulting in
slower separation. Larger particles (1) are more
easily separated than smaller ones (2) even if
they have the same density.
The throughput
The throughput sets the time allowed for the
separation of water and sediment from the oil. A
better separation result can often be achieved by
reducing the throughput, i.e. by increasing the
settling time.
Sludge space - sludge content
The sediment accumulates along the bowl wall. If
the sludge is allowed to fill up the space outside
the discs the flow in the bowl is influenced, and
the separating efficiency is reduced. In such
cases the time between discharge of sediment
should be reduced to prevent this effect.
Disc stack
A neglected disc stack containing deformed discs
or discs coated with deposits will impair the
separating result.
Gravity disc
The position of the interface is adjusted by
altering the outlet diameter of the heavy liquid
phase, that is by exchanging the gravity disc.
2 1
A
B
m³/h
µ
m
G
0
61
33
1
1
Influence of size and shape
G
0
60
12
1
1
Sludge accumulation
S
006
86
1
1
Gravity disc diameter sets the oil/water interface
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