Electrolytic Seawater Method
The most indispensable in seawater is sodium chloride. Hypochlorous acid is generated by electrolysis of seawater. According to some manufacturers' information, this available chlorine in seawater can be inhaled by normal operations of ships at 0.2ppm to 0.5ppm. Plankton in sea water. Above 0.5ppm may cause corrosion to piping and equipment. This method comes in two forms:
Direct type: That is, the electrolytic anode is directly installed in the seawater filter or seawater pipeline or the submarine door of the ship. The seawater pipeline itself is used as the cathode, and the seawater is used to form a circuit. The effective chlorine generated by electrolysis is directly mixed in the seawater. The direct electrolytic seawater and sea defense biological device has the characteristics of simple structure, convenient installation, and low cost. It can also provide certain cathodic protection for the pipeline, but it is inconvenient to maintain.
Indirect: Also known as the electrolytic tank type seawater and sea defense biological device, a part of the seawater passes through the filter and pressure controller, and then is sent to the electrolytic tank for electrolysis. After electrolysis, the seawater containing available chlorine passes through the transmission pipeline and then to the seawater pipeline or Inside the ship's undersea door. The electrolytic cell of this system requires higher material, but it is more severely corroded. The electrolytic tank type electrolytic seawater and sea defense biological device has the characteristics of large processing capacity, convenient operation and maintenance. During the electrolysis of seawater by the electrolytic cell, electrolytic by-products such as magnesium hydroxide and calcium carbonate will be generated. Most of the electrolytic by-products will be removed along with the seawater. However, after the system is operated for a long time, some by-products may adhere or It accumulates inside the electrolytic cell, blocks the electrolytic cell, and scales on the anode, which will cause electrode burnout. Therefore, the anode must be acid-washed periodically during use.