Ship seawater desalination equipment is composed of a pretreatment system, reverse osmosis system, electrical control system, cleaning system, dosing system, etc.
Technical principle of ship seawater desalination equipment:
The pretreatment system includes a raw water tank, a feed water pump, a multi-media filter and a precision filter. It mainly deals with large particle impurities, residual chlorine and fine particles contained in seawater to ensure the feed water quality of the reverse osmosis system. The reverse osmosis system consists of high-pressure pumps, reverse osmosis membrane modules, pressure regulating valves and cleaning tanks, mainly to further process the pre-treated raw water into fresh water.
Process Flow Diagram :
The feed water pump pressurizes and lifts the seawater in the raw water tank into the pretreatment system, where it is filtered through the multi-media filter. After passing through the pretreatment system, the seawater enters the high-pressure pump. Under the action of the high-pressure pump, it flows through the spiral wound membrane with a high desalination rate. By controlling the pressure regulating valve to increase the pressure, part of the pure water in the seawater passes through the membrane and enters the porous collection pipe, then flows out of the equipment through the hose and into the fresh water tank, while the salt is blocked on the membrane surface and discharged from the equipment along with most of the seawater.
During the operation of ships, a considerable amount of fresh water is consumed every day to meet the demands of the operation of power plants and the daily water needs of crew members.
The fresh water needed by ships can indeed be carried from the water tanks at the port of departure, but doing so will inevitably occupy a certain amount of tank capacity and affect the tonnage. Moreover, once the navigation situation changes, the fresh water carried is often difficult to meet the demand not only in quantity but also in quality. Especially for ocean-going vessels with long routes and special vessels with long operation times, the mobility of water storage becomes extremely necessary.
By using the ship’s own capacity to produce fresh water, fresh, qualified and sufficient fresh water can be obtained at any time, bringing dual benefits in terms of performance and economy. Therefore, modern ocean-going ships are all equipped with seawater desalination devices, which are commonly known as water generators. There are many methods for desalinating seawater, such as distillation and reverse osmosis. Due to the advantages of reverse osmosis Marine seawater desalination equipment, such as simple operation, convenient installation and low cost, it has been installed and used by most ships.
At present, the shipping industry is in a stage of reducing carbon emissions, and most shipowners choose reverse osmosis seawater desalination equipment to replace distillation water machines.
