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PHARMASTILL MULTI EFFECT
STILLS |
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OPERATING PRINCIPLE
The Pharmastill New series
HPS is based on "Thin Falling Film"
and Multi-stage principles
ingeniously combined.
The first effect is
fed by an external heat source (Industrial
steam or Electrical energy).
This energy is totally
reused in the subsequent effects,
due to the successively lower
operating temperatures and pressures.
The efficiency (liters
per kg of steam or per Kw) depends
on the number of effects and
increases if the number of effects
increases while the production
capacity remains unchanged.
Increasing the feed steam pressure
in the first effect (usually between
3 and 8 bar) increases the distilled
water production capacity.
OPERATION DESCRIPTION
The demineralized feed water
is preheated in the first of the two
final exchangers by the steam
produced in the in the last effect
then and in the subsequent
pre-heaters by the distillate
produced in the remaining effects.
All feed water reaches
the maximum temperature in the first
effect, thereby being rapidly heat
sterilised, where it partially
evaporates, heated by industrial
steam or electrical energy.
The pure steam
produced and the water which has not
evaporated pass to the next column,
operating at a lower temperature and
pressure.
The pure steam is
condensed producing distillate,
vaporising a new portion of feed
water. This process is repeated in
the other effects. The pure steam
produced in the last effect is
condensed by the feed water and
cooling water in two final
exchangers. |
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Operation
description |
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ADVANTAGES |
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Rapid start-up. The
distillate is produced
after only few
minutes from switch on |
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The production capacity
can be varied by up to
80%
without any modification of the plant |
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Gravitational
purification principle
for better guarantee
of purity. The contaminant particles have low energy and
less carry over potential |
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Baffle free
decontamination chamber
- No welding or
crevices and consequently better inspectability |
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Limited maintenance |
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No moving parts,
expansion joints or
mechanical seals |
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Compact construction and
low weight. Little extra
head
room needed for dismounting and inspection |
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Choice of PLC control
packages, standarised
software to
GAMP |
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Full validation
documentation package |
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