Main principle EWS evaporator
When seawater is boiled in a vacuum chamber, vapour can be produced at temperatures as low as 40°C. It is this principle of low temperature/low pressure distillation, which is applied in the evaporator for the production of fresh water from seawater. It utilizes a source of low-grade heat, mostly waste heat from diesel engines, to produce the vapour.
In the evaporator a controlled amount of seawater is supplied
as feed water, to the bottom of the heat exchanger. Here the seawater
is heated in a vacuum and evaporated. The remaining non-evaporated
seawater is discharged continuously in order to control the brine
density. The evaporator uses the rejected heat from the fresh
water-cooling system of the ship's engines. This hot jacket water,
which may reach a temperature between 75°C and 90°C, is passed
outside the tubes of the heat exchanger.
The evaporators, marketed under the EWS banner, are compact, suitable for bulkhead or stand-alone installations. Combined with a UV sterilizer, the quality of the fresh drinking water produced, meets the high standards set by of the World Health Organisation (WHO).
The installation contains:
The stainless steel EWS evaporators are standard provided with:
Advantages EWS evaporators
Accessories EWS evaporators
On request, all our units can have an accompanying Lloyds, Rina, Veritas, etc., certificate.
Drema Waterbehandeling B.V. also can deliver larger capacities on request.