Single Stage

Sondex Single-Stage Freshwater Distiller:

Features and Application:

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 standard capacity range is from 1-150tons/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.

Operation:

The Sondex single-stage freshwater distiller consist 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 built 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 the ejector pump.
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.