Corrosion inhibitor for one-stage reverse osmosis water produced from sea water desalinization

Abstract

The invention relates to a corrosion inhibitor for one-stage reverse osmosis water produced from sea water desalinization, and the corrosion inhibitor is composed of sodium gluconate and sodium silicate, wherein the mass ratio of sodium gluconate to sodium silicate is (1:2)-(1:3), and the concentration of the mixed reagent is 20-30mg/L. Because the formula does not contain phosphate, the corrosion inhibitor is almost harmless to environment. In addition, the reagent cost of each ton of water is ****, and thus the corrosion inhibitor has good economy.

Description

technical field [0001] The invention relates to a corrosion inhibitor for seawater desalination primary reverse osmosis product water, belonging to the technical field of seawater desalination. Background technique [0002] With the continuous increase of water consumption and the general pollution of natural water bodies, the shortage of fresh water resources has become one of the main bottlenecks restricting the development of the national economy. With the maturity of reverse osmosis technology, the use of reverse osmosis technology to obtain fresh water from seawater has been widely used in countries all over the world. Since the use of primary reverse osmosis technology can remove 99% of the salt in seawater, making the salt content of the produced water close to that of natural fresh water, the method is economical and reliable; therefore, primary reverse osmosis technology has become the main way to solve the water supply problem in coastal areas. As a large water us...

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Problems solved by technology

This not only seriously affects the quality of water supply, but also directly threatens the safety of the water distribution network, and even affects the normal and efficient operation of the entire power plant.

[0004] At present, at home and abroad, the methods of adding alkalinizing agents such as sodium hydroxide to adjust the pH value or adding salts containing calcium, magnesium, and carbonate ions are mainly used to slow down the corrosion effect of seawater desalination first-stage reverse osmosis product water on metal materials. , not only the infrastructure and operating costs are high, and the effect is not good, but also the introduction of a large amount of hardness ions into the first-stage reverse osmosis product water of seawater desalination will cause fouling tendencies in the subsequent pipelines, which is not suitable for popularization and application in thermal power plants

At present, some scholars (Liu Guangzhou, Wang Haitao, etc., a corrosion inhibitor for seawater desalination primary reverse osmosis water, publication number: CN101705489.A) draw on the experience of circulating cooling water operation, and use high phosphate corrosion inhibitor formula to Slowing down the corrosion of metals in seawater desalination primary reverse osmosis water has achieved certain results, but there are still some shortcomings: (1) Phosphate is easy to cause environmental problems such as eutrophication, and wastewater containing high phosphate is harmful to the environment. High wastewater treatment costs are required; (2) Phosphate is corrosive to copper alloys such as copper that also exist in the system; (3) The dosage of chemicals is large and the operating costs are high, and the cost of chemicals is 0.2-0.6 yuan / ton For a large-scale thermal power plant with a daily water consumption of 10,000 tons, the operating cost is too high to bear

(4) The chemical components will react with each other to produce precipitation at high concentrations, and must be added separately, the operation management is complicated and the equipment occupies a large area

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