Corrosive negative ion removal apparatus and regeneration method of negative ion exchange resin

Abstract

The invention provides a corrosive negative ion removal apparatus, which is easy to use and can actually prevent corrosion, as well as a regeneration method of negative ion exchange resin. The corrosive negative ion removal apparatus (10) includes the negative ion exchange resin (12), which exchanges corrosive negative ions in water, fed to a distribution pipe (11), by anti-corrosion negative ions, thus producing negative ion exchange processsed water. The apparatus is provided with a regeneration pipeline (17) which only allows NaHCO3 water solution, diluted by tap water, to be contacted with the negative ion exchange resin (12) during regeneration of the negative ion exchange resin (12).

Description

technical field [0001] The present invention relates to a corrosive anion removal device and an anion exchange resin regeneration method, wherein the corrosive anion removal device includes an anion exchange resin for replacing corrosive anions contained in water supplied into piping with anticorrosive anions. Background technique [0002] In general, pipes for air-conditioning equipment such as refrigerators, hot and cold water pipes, and cooling water pipes, or pipes for production processes, need to be filled with water for piping sealing tests, etc., and localized corrosion may occur immediately after filling the water. point of danger. The water quality or operating conditions immediately after filling will greatly affect the occurrence of this type of localized corrosion. It is known that this type of corrosion occurs easily in places where there is no water flow in the piping, at elbows, and on the downstream side of valves. [0003] In order to prevent such pipe cor...

AI Technical Summary

Problems solved by technology

For these reasons, it is very difficult to adopt the anti-corrosion method in the above-mentioned Patent Document 1 at a construction site

[0009] And, it has been confirmed by experiments that sodium bicarbonate (NaHCO 3 ) After the aqueous solution is in contact with the anion exchange resin, the pH value of the aqueous solution is acidic, which may promote the corrosion of metal materials.

Therefore, the use of the anti-corrosion method in the above-mentioned Patent Document 1 at a construction site also has problems in terms of anti-corrosion measures.

[0010] On the other hand, since the flushing method of the above-mentioned prior art needs to replace the water in the piping many times, oxygen will be supplied, and there is a problem of promoting corrosion.

In addition, ultra-fine water particles that cannot be removed by the mesh of the filter accumulate in the piping and may become a point of localized corrosion.

Images