Wärtsilä's Multi-Stage Flash (MSF) evaporator is used for producing distillate (fresh water) from sea, well or industrial water. A specific advantage of the multi-stage flash technology is that the heat consumption - or thermal efficiency - can continuously be adjusted to the set requirements of each application. The MSF is able to produce up to 1500 tons of distillate per day.
The Multi Stage Flash is one of the most reliable thermal seawater desalination plants in the world. It is the only evaporator technology that strictly separates heat transfer and evaporation, minimizing the risk of scaling and greatly reducing maintenance costs.
The distillate produced by a MSF has a very low salt content (conductivity < 4 μS/cm). This makes it very suitable to be used as technical water (e.g. boiler feed water). The distillate quality and quantity are are not impacted by the seawater temperature. The MSF is therefore a reliable source for freshwater on board of ships and offshore platforms. It can also be used for many land-based applications.
After leaving the first stage condenser (3), the seawater flows through the brine heater (1), where the heat input to the plant (steam or engine jacket water) causes a further temperature increase.
The seawater leaves the brine heater (1) and enters the first flash chamber (2), reaching a brine top temperature of approx. 80°C.
At this point the pressure of the incoming seawater is suddenly reduced, by means of an orifice, below its equilibrium vapour pressure resulting in explosive boiling or evaporation (flashing). The pure vapour produced is then condensed, giving up its latent heat to preheat the incoming seawater (3).
If this process is repeated over a large number of effects, at successively lower pressures and temperatures, large distillate production rates at reasonable performance ratios can be achieved.
|System||Capacity (ton/day)||Power (kW)||Dry weight (kg)||Wet weight (kg)||Footprint
(L x W x H, mm)
|MSF 115-5||115||915||18000||21000||5700 x 2900 x 3000|
|MSF 300-6||300||2388||27000||32000||7300 x 2900 x 3300|
|MSF 650-6||650||5146||37000||45000||9200 x 3500 x 3900|
|MSF 775-8||775||4812||42000||52000||10500 x 3600 x 3900|
|MSF 850-8||850||4780||43000||53000||11700 x 4200 x 3900|
|MSF 950-8||950||6395||45000||55000||12000 x 3700 x 3900|
Capacity up to 1500 ton/day.
Steady production of freshwater at seawater temperatures 0 - 32ºC.
Water conductivity of distillate for all models: < 4 μS/cm.
SCOPE OF SUPPLY
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