Technical Principle of Marine Water Generator: During the operation of ships, a considerable amount of fresh water is consumed every day to meet the needs of power plant operation and domestic water needs of the crew. The fresh water required by the ship can of course be carried in water tanks from the port of departure, but doing so will inevitably occupy a certain amount of tank capacity and affect the tonnage. Moreover, once the navigation conditions change, the fresh water carried will often deteriorate not only in quantity but also in quality. It is difficult to meet the demand, especially for ocean-going ships with long routes and special ships with long operating hours. The mobility of water storage is very necessary. By using the ship's own ability to produce fresh water, fresh, qualified and sufficient water can be obtained at any time. Fresh water brings both performance and economic benefits, so modern ocean-going ships are equipped with seawater desalination devices, which are commonly called water generators. There are many methods for making desalinated seawater, such as distillation and reverse osmosis. Since reverse osmosis water generators have the advantages of simple operation, convenient installation, and low cost, they have been installed and used on most ships.
The marine water generator is composed of a pretreatment system, a reverse osmosis system, an electrical control system, a cleaning system, and a dosing system.
The pretreatment system includes water supply pumps, multi-media filters, precision filters, and security filters. It mainly treats large impurities, residual chlorine and fine particles contained in raw water to ensure the incoming water quality of the reverse osmosis system.
The reverse osmosis system includes a high-pressure pump, a reverse osmosis membrane module, a pressure regulating valve, and a cleaning tank. It mainly processes the pretreated raw water into fresh water.
The seawater desalination process of the marine water generator is
The seawater is pumped by the water supply pump into the pretreatment system. After adding bactericide and flocculant through the chemical dosing system, it enters the quartz sand and activated carbon filtration system for filtration. The seawater enters the high-pressure pump after the pretreatment system. Under the action of the high-pressure pump, it flows through the high-desalination rate rolled membrane. The pressure is increased by controlling the pressure regulating valve, so that part of the pure water in the seawater passes through the membrane and enters the porous collection pipe. The pipe flows out of the device, while the salt is blocked on the membrane surface and drains out of the device along with most of the seawater. The filtered water enters the security filtration system after water quality reduction, adjustment and addition of anti-scaling agents. The filtered low-pressure seawater enters one way into the high-pressure pump for pressurization, and the other way into the pressure exchange energy recovery device. The boosted seawater is pressurized. After the pump is pressurized, it mixes with the high-pressure pump water and enters the reverse osmosis membrane stack system. The high-pressure seawater passes through the membrane to form fresh water after being processed by the membrane stack. After the water quality is adjusted, it enters the fresh water tank for storage. The remaining high-pressure concentrated water enters the pressure exchange energy recovery device to recover energy and then is discharged.
The core components of the large-scale marine water generator produced by Zhuhai Fang Seawater Treatment Equipment Co., Ltd. are matched with foreign products. The seawater desalination process and equipment operating parameters have been optimized and designed through computers to achieve the highest standards in the seawater desalination equipment industry. Advanced level.
Technical principles of marine water making machine
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