7T/D Marine Fresh Water Generator FWG

7T/D Marine Fresh Water Generator FWG

Fresh water generator on ship is sea water desalination device, it is widely use on ships such as ocean-going vessels, fishing vessels etc. The desalinated water is generally used for domestic, industrial, power plant, boiler etc, it is evaporated less than 10ppm. 

General 

Based on the general design scheme, the Fresh Water Generator which mainly consists of  evaporating and condensing chambers, ejector equipped for vacuum, as well as relevant accessories  for the system.  Furthermore the whole control system is to be designed as maker standard in according to our  design purpose. Subject salinity meter is exclusively composed by maker, the design scheme  concludes with temperature compensation.  The system designed under rough sea condition. That is for 32 0 C sea water and 75 0 C cylinder  jacket cooling water. Under such circumstance, the unit can reach distillate production capacity of 5 t/d. Each unit consists of a condenser and an evaporator installed in a same chamber.

.Standardized parts for easy maintenance

 Technical Specification 

Theory description:  The sea water enters the plant at the condenser for cooling the water vapor, flows through the  condenser. Then a little quantity is fed into the evaporating chamber and about half of them  evaporating to vapor, the sea water is heated by the cylinder cooling water of main engine. The rest  quantity of sea water is led to the brine/air ejector, where brine and air is take off, and was  discharged to overboard.  The pressure inside the chamber is less than atmosphere (vacuum), in this way the evaporating  temperature usually is lower than 45 degree. The vapor rises from the evaporating chamber, which  flows through the demister where brine mist is removed, and pure steam condensed to liquid in the  condenser.  

FRESH WATER GENERATOR, FWG-7 

 Type FWG-7 

 Distillate produced 7 t/d  

 Heat consumption 150kw  

 Residual salt content less than 10 ppm NaCl  

 Distillate temperature abt.42 0 C  

 Sea water quantity 15 m3/h  

 Sea water pump suction pressure >0bar  

 Max. Sea water temperature 32 0 C  

 Total dissolved solids 35000 ppm

 Feed water 625 l/h  HEATING MEDIUM, jacket water  

 Quantity 15 m3/h  

 Operating pressure<4 bar  

 Inlet temperature 75 to 90 0 C  

 Temperature drop<12 0 C  EJECTOR, sea water  

 Sea water quantity 15m3/h  

 Outlet back-pressure<0.7 bar  

 Inlet pressure >3.5 bar  DIMENSIONS AND WEIGHT OF THE UNIT  

 Dimension: LxWxH According to drawing  

 Weight Approx.400kg 

 Weight in operation Approx.550kg

Model List:

Sea water supply pump is only loose part which will be installed independently in proper position.

Control cabomet with embedded salinity meter directly fitted on the body of the unit and the cabinet also can be arranged separately in where convenient for operation.

Steam heating block, hot water, thermal oil heating block

Working Principle Drawing