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Freshwater Generators from Wärtsilä
Also known as 'Serck Como'

Horizontal inner Tube Evaporators

The Wärtsilä Horizontal inner Tube Evaporator (HiTE) is a multi-effect evaporator specifically designed for producing small to medium capacities of 30 to 175 tons of distillate per day. This marine freshwater generator guarantees potable water for human consumption and clean process water for technical applications. It serves in a wide range of operational areas where alternative technologies like reverse osmosis or plate technology reach their limits. Shallow waters with poor seawater quality is an example of this. 

The HiTE operates smoothly even at partial load. For example during dynamic positioning (DP) operations. The unit’s control system can be fully or semi-automated. Its smart processes adapt automatically to the amount of energy available. The HiTE is able to use waste heat. This is very convenient for vessels with varying engine profiles. The 4-stage HiTE offers up to 75% energy savings with a specific heat consumption of 180 kWh/t compared to single stage designs (700 kWh/t). For a 3-stage HiTE this is 240 kWh/t.  

 
The HiTE is able to utilise waste heat. This is very convenient for vessels with varying engine profiles.
 

    KEY BENEFITS

    • Efficient & reliable multi-effect distilling process
    • Low operational cost
    • Lowest energy consumption in its range
    • Most efficient solutions when utilizing engine waste heat
    • Water conductivity of distillate < 4μSv
    • Designed for easy maintenance and long service intervals
    • Flexible adaptation to demand and/or supply (down to 50%) thanks to exceptional part-load capability
    • Flexible use of heat sources: engine jacket water, steam or combination
    • Fully automatic system
    • Also suited for land-based applications  

    TECHNICAL DATA

    • Seawater inlet temperature: 0 – 35°C
    • Capacity 30 – 175 tons/day
    • Footprint: 6.6 – 24 m2
    • Weight empty: 2,156 – 8,100 kg
    • Heating water inlet temperature from 70 – 95°C
    • Thermal power consumption: 180 - 240 kWh/t
    • Electrical power consumption: 2.9 - 5.9 kWh/t 

    WORKING PRINCIPLE

    The HiTE marine freshwater generator consists of 3 film evaporators (connected in series) and one condenser. The seawater is passing through the condenser. The major portion - after being used as cooling medium - is flowing back to the sea. A certain (minor) quantity is distributed in three parallel streams directly into the evaporators. The 1st effect is heated by hot engine cooling water. Before evaporation can start, the feed water entering evaporator effect one is heated inside the tubes up to the boiling temperature.
     
    HiTE process illustration
     
    The released vapours are separated from the water/vapour mixture and are entering the 2nd and possible 3rd effects as heating medium. The procedure of condensation/evaporation is repeated in the 2nd and 3rd effect before the residual vapours produced in the 3rd effect are entering the condenser.

    The surplus brines are cascaded via syphon pipes from stage to stage, as well as the collected distillates. The distillate from the 3rd effect is flashing into the condenser hot well which also serves as distillate collecting tank. The distillate is pumped into the collecting tank.

    MODELS

    System Capacity (tons/day) Thermal power (kWh/t) Electrical power* (kWh/t) Dry weight (kg) Wet weight
    (kg)
    L x W x H
    (mm)
    Footprint (m2)
    HiTE 30-3 30 to/d 240 5,9 2156 2415 1800x1500x2000 6,64
    HiTE 50-3 50 to/d 240 5,3 3600 4025 2300x2000x2000 14,47
    HiTE 80-3 80 to/d 240 4,2 5200 5865 2750x2000x2000 11,94
    HiTE 120-3 120 to/d 240 4,1 6500 7475 3250x2000x2000 14,0
    HiTE 120-4 120 to/d 195 3.2 7200 8280 3750x2000x2000 19,0
    HiTE 175-3 175 to/d 240 3,8 7000 8050 4250x2300x2200 21,5
    HiTE 175-4 175 to/d 195 2,9 8100 9315 4750x2300x2200 24,0
    * Electrical power consumption can vary depending on conditions
    Water conductivity of distillate for all models: < 4 μSv

    Variants

    Tandem ejector: without brine pump, but with higher electrical power
    Heating water source: for all qualities of water between 70 °C and 95 °C, steam or a combination of both
    Electrical control: PLC or manual control

    SCOPE OF SUPPLY

    Delivered as standard  

    • Tube evaporator with condenser 
    • Distillate pump 
    • Ejector pump Seawater pump
    • Chemical dosing tank with dosing instruments
    • Solenoid valve for draining lower quality distillate
    • Siemens S7 control panel 

    Options  

    • Mineralization filter for adjusting distillate pH-value 
    • UV steriliser for disinfecting the distillate 
    • Booster heater 
    • Distillate cooler 
    • Control panel mirroring 

    Applications

    The Horizontal inner Tube Evaporator is predominantly known as a marine freshwater generator. It suites a wide range of vessel types such as chemical tankers, small cruise ships, ferries and special purpose vessels. Did you know that also offshore and land-based applications are equipped with HiTE’s? 

    Also land-based industry
    orders HiTE units

    Wärtsilä has strong roots in the maritime industry and has been supplying freshwater generation systems...

    Read more »

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