Seawater-electrolyzing chlorine-producing antifouling method

Abstract

The invention discloses a seawater-electrolyzing chlorine-producing antifouling method and belongs to the field of seawater antifouling. The method includes the steps that seawater is firstly subjected to coarse filtration to remove impurity particles in the water; secondly, an ultra-filtration membrane module is used for further removing minute and colloidal substances in the seawater; the purified seawater is pretreated, and the calcium and magnesium ions are removed through a nanofiltration membrane to reduce the total concentration of the calcium and magnesium ions to 500-600 ppm; then thetotal concentration of the calcium and magnesium ions in the seawater is less than 100 ppm by using an adsorption resin; the pretreated seawater is introduced into a seawater ion membrane electrolysis cell for electrolysis; and the seawater is electrolyzed to generate chlorine gas and dilute lye. The coarse filtration, fine filtration and the membrane module are adopted to pretreat the seawater to achieve the purpose of seawater purification of calcium magnesium and sulfate ions, and the water quality requirement of the seawater for the ion membrane electrolysis cell can be satisfied. According to the ion membrane electrolysis cell technique, the ion membrane electrolysis cell used for electrolyzing the seawater is formed, finally, a method for making full use of electrolytic chlorine isprovided, and measures for efficient chlorine distribution to seawater pipelines are included.

Description

technical field [0001] The invention relates to a method for electrolyzing seawater to produce chlorine for antifouling by adopting ion-exchange membrane electrolyzer technology, and belongs to the field of seawater antifouling. Background technique [0002] Since ancient times, the fouling of marine organisms has affected human activities at sea. For this reason, people have begun to study methods for removing fouling organisms from the wooden ship era. With the development of science and technology, the antifouling methods are roughly divided into the following three categories: antifouling coatings, antifouling agents and electrochemical antifouling technology. [0003] Antifouling coatings are generally used for antifouling of ship hulls. Due to the complexity of the seawater piping system, especially the different diameters of seawater pipelines, there are many small-diameter pipelines, many pipeline bends, and many valve fittings, it is impossible to use internal ant...

AI Technical Summary

Problems solved by technology

Although the direct electrolytic seawater antifouling device has the characteristics of simple structure, convenient installation and low cost, the calcium and magnesium precipitates generated during the electrolysis of seawater may cause pipeline blockage

At the same time, since the pipeline is used as the cathode of the electrolysis, the potential difference of the entire pipeline system may be caused, resulting in some pipelines receiving certain cathodic protection, while another part of the pipeline is corroded

In addition, the hydrogen produced by the electrolysis process will be enriched in the high position of the pipeline, posing a safety hazard

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