Chemical cleaning corrosion inhibitor desorbent

By using a chemical cleaning corrosion inhibitor desorbent composed of an alkalizing agent and a solubilizer, the problem of corrosion inhibitors being difficult to flush out after boiler chemical cleaning was solved, achieving stability of water vapor hydrogen conductivity and water quality, and preventing rust from returning to the metal surface.

CN116768376BActive Publication Date: 2026-02-06XIAN THERMAL POWER RES INST CO LTD
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Patent Information

Application Number
CN202310767465.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-27
Publication Date
2026-02-06
Estimated Expiration
2043-06-27

AI Technical Summary

Technical Problem

In existing technologies, corrosion inhibitors are difficult to completely flush out after chemical cleaning of boilers, leading to problems such as excessive water-steam-hydrogen conductivity and substandard water quality in the unit.

Method used

A chemical cleaning agent for corrosion inhibitors and desorbents is used, consisting of an alkalizing agent and a solubilizer. By providing an alkaline environment, the corrosion inhibitor is desorbed and carried out of the system by water flushing. It includes 15% to 25% alkalizing agent, 0.1% to 1.0% solubilizer, and the balance demineralized water. The pH value is controlled above 10.0, the temperature is 80 to 95°C, the circulation flow rate is 0.1 to 1.0 m/s, and the time is 0.5 to 2 hours.

Benefits of technology

It effectively promotes the desorption of corrosion inhibitors, solves the problem of excessive water vapor and hydrogen conductivity, reduces water consumption for rinsing, ensures water quality compliance, and prevents rust from returning to the metal surface.

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Abstract

The application discloses a chemical cleaning corrosion inhibitor desorption agent and belongs to the technical field of chemical cleaning. The desorption agent is composed of 15-25% alkalizer, 0.1-1.0% solubilizer and desalted water. The corrosion inhibitor used in the chemical cleaning process is adsorbed on the metal surface and is difficult to be washed out of the system by water. During the start and operation of the unit, the corrosion inhibitor is gradually desorbed and decomposed, which leads to the problems of over-standard water vapor hydrogen conductivity, unqualified water quality for a long time and the like. After the chemical cleaning is completed, the desorption agent is added during the water washing work, so that the desorption of the corrosion inhibitor is promoted, the corrosion inhibitor is taken out of the system with the water washing, and the problems of over-standard unit water vapor hydrogen conductivity caused by the adsorption of the corrosion inhibitor are solved.
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