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W?rtsil? Multi Stage Flash Evaporators

The Wärtsilä multi-stage flash (MSF) evaporator is utilised for producing fresh water from seawater, well water or industrial water.

A special advantage of the multi-stage flash technology is that the specific heat consumption (or thermal efficiency) can be continuously adapted to the individual requirements of each application.

The produced distillate has a very low salt content which makes it suitable as technical water (e.g. boiler feed water). The distillate quality and quantity are independent from the seawater temperature which makes the MSF technology a reliable source for freshwater.

    • Capacity up to 1500 t/d.
    • Steady production of freshwater at seawater temperatures between 0-32°C.
    • Either steam, engine jacket water or a combination of these can be utilized for heating.
    • Full-automatic or semi-automatic operation.
    • Heat transfer and evaporation takes place in different areas, resulting in a minimised risk of scaling (flash).
    • Sturdy construction with low maintenance demands resulting in high availability.
    • Lowest sensitivity to malfunction or maloperation.
    • Components in contact with seawater or distillate are manufactured with corrosion resistant materials (e.g. copper- nickel).
    • Technology with the lowest lifecycle costs.
    • Flexible dimensions allow for the best utilisation of space.
    • Operating frequency converter for pumps saves energy.
    • Salt content of the distillate ≤ 4 ppm NaCI.
    Spare parts and service

    Please send the vessel name, equipment type, serial number (if known), your company details and spares and/or service requirements to wsc.aftersales@wartsila.com and we will respond as soon as possible.

    Principles of operation

    After leaving the first stage condenser, the seawater flows through the brine heater, where the heat input to the plant (steam or engine jacket water) causes a further temperature increase. The seawater leaves the brine heater and enters the first flash chamber, 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. 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.

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    Contact us

    Please fill in the form, we aim to respond within 1-2 business days depending on the enquiry. For an existing installation, provide all necessary details to identify the installation and the equipment. Fields indicated with an asterisk (*) are required. 

    Find your local Wärtsilä office here

    ? 2021 W?rtsil?
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