Special corrosion and scale inhibitor for boiler

Abstract

The invention provides a special corrosion and scale inhibitor for a boiler. The special corrosion and scale inhibitor is composed of hydroxyethylidene diphosphonic acid, ethylene diamine tetra (methylene phosphonic acid) sodium, diethylene triamine pentamethylene phosphonic acid, hydrolytic polymaleic anhydride, acrylic acid-hydroxypropyl acrylate copolymer and deionized water. The special corrosion and scale inhibitor has higher dispersion capability and higher calcium tolerance and still can effectively control scale formation under conditions of high hardness, high alkali, high iron, high pH and high temperature. The special corrosion and scale inhibitor can be matched with other traditional scale inhibition and dispersion agents for use, simultaneously has very higher corrosion inhibition capability and is a more ideal corrosion and scale inhibition dispersion agent for water treatment of the boiler.

Description

technical field [0001] The invention belongs to the technical field of industrial circulating cooling water treatment, and in particular relates to a special corrosion and scale inhibitor for boilers. Background technique [0002] Because the water body contains different amounts of soluble ions such as calcium and magnesium, various acid radical ions and trace metal ions, scale or corrosion will occur on the heat exchange surface of the boiler circulating water. The traditional water treatment technology of the boiler is to stop the boiler for physical or chemical cleaning after scaling. If the equipment has been scaled or corroded before cleaning, it will consume more energy during daily operation, increase the water supply and sewage discharge of the system, waste a lot of water resources, and shorten the service life of the equipment. The use of boiler anti-corrosion and anti-scaling water treatment agent can make the scale generated during the operation of the boiler g...

AI Technical Summary

Problems solved by technology

[0004] In the above patents, organic phosphonates have become the preferred species due to their dual functions of corrosion and scale inhibition, but only rely on the corrosion inhibition of organic phosphonates, Its effect is still not ideal, and it is necessary to add a corrosion inhibitor that has a synergistic effect

At present, although commonly used scale inhibitors can solve the scale problem of industrial boiler water treatment to a certain extent, there are still many defects. They have low tolerance to calcium ions in water, and their scale inhibition ability in iron-containing and oil-containing water decline, the compounding and compatibility performance with other water treatment corrosion and scale inhibitors is not satisfactory, and cannot meet the technical requirements for boiler scale inhibition