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Fresh Water Distillers/Generators |
The SONDEX freshwater distiller
utilizes the heat from diesel engine jacket cooling water
to produce pure drinkable water by evaporating sea water
under high vacuum, enabling the feed water to evaporate at
temperatures below 48°C.
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Steam can also be used as
the heat source instead of the hot jacket water. The SONDEX
freshwater distiller is based on two SONDEX titanium plate
heat exchangers, acting as an evaporator and a condenser
respectively.
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CAPACITY 1-150 tons/day.
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SONDEX Single-Stage Freshwater Distiller
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Features and Application:
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- The
SONDEX single-stage freshwater distiller utilizes the heat
from diesel engine jacket
cooling water to produce pure drinkable water from seawater.It
is simple to operate and easy to maintain.
- The capacity range is from 1-100
tons/day.
- The distiller is equipped with a salinity
controller with alarm, running-hour meter and chemical
dosing unit as standard.
- It operates fully automatically
according to given water flow and pressures, and requires
a minimum of
supervision.
- The SONDEX single-stage
freshwater distiller is based on the specially-designed "vertical
tube" plates resulting in excellent water distribution
with no disturbing contact points in the boiling stage.
Therefore water scaling is very low.
- Steam can
also be used as the heat source instead of the hot jacket
water.
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Operation:
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The SONDEX single-stage freshwater distiller consists of two
SONDEX titanium plate packs acting as an evaporator and a condenser
respectively.
The evaporation chamber is kept under vacuum by
a water ejector driven by the seawater outlet from the condenser.
Some of this heated seawater is used as feed water for the evaporator.The
feed water evaporates when entering the evaporating chamber due
to the vacuum condition. Water spray and droplets are partly
removed from the vapour by the separator plate mounted on top
of the evaporator and partly by a built-in demister. The separated
water droplets fall back into the brine which is extracted from
the sump by means of the ejector pump.
The desalted vapour passing
through the demister will be sucked into the plate heat exchanger
where it will be condensed by means of cold incoming seawater.
The
pure distilled water will be taken out by an integral freshwater
pump. The pure water taken out from the condenser will be controlled
by a salinometer to ensure that the preset salinity (1-10 p.p.m.)
will be reached.
If the salinity exceeds the level specified,
the solenoid valve in the discharge line of the distiller pump
is automatically activated and the faulty distillate is returned
to the feed line.
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SONDEX Two-Stage Freshwater Distiller
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Features and Application:
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- The SONDEX two-stage freshwater distiller works
through the utilization of waste heat and is used where
high production is required and there is limited available
energy.
- It
consumes about half the energy of the single stage
units.
- Typical
applications are off-shore rigs, passenger ships, hotels
and other places where the waste heat is limited
or expensive to
create.
- The distiller has been specially designed
and fully scale tested to ensure excellent performance
and reliability with long service intervals and
production of pure
freshwater with a low salinity.
- The SONDEX
two-stage distiller covers a capacity range from
50 tons/day up
to 150 tons/day. Therefore we can offer our customers
an economical
and technical solution which is superior to any
other evaporators on the market.
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- The SONDEX two-stage
unit has many remarkable features, it incorporates the specially-
designed "vertical tube" plates
which give excellent water distribution with no disturbing
contact points in the boiling stage. This means the water
scaling is
very low.
- The distiller operates fully automatically
according to given water flow and pressures, and requires
a minimum of supervision.
- Steam can also be used as
the heat source instead of the hot jacket water.
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Operation:
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The distiller consists of three SONDEX titanium plate packs
located in two separated chambers working with different vacuums.
The
upper plate pack – called stage one – evaporates
the feed water at 70% vacuum in chamber one. The steam goes through
a large diameter pipe down to the second stage where it condenses
and releases its energy into the secondary side of the plate
pack filled with pre-heated brine obtained from stage one.
The
pre-heated brine evaporates immediately, as the second stage
is working at 90% vacuum in chamber two. The final condenser
plate pack, also located in chamber two, is cooled with cold
seawater driving the ejector which removes the non-condensable
gases and brine from the evaporation process in both stages.
Each
chamber is equipped with a demister removing water drops and
salt from the steam produced in stage one as well as stage two.
This results in high quality freshwater coming out from both
condensers.
The freshwater produced in both stages flows into
a "flash tank" ensuring any steam bubbles are removed
before entering the freshwater pump, which pumps the water into
the storage tanks.
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