Dissolving-dispersing detergent for scale in pipes of high-temperature high-pressure boiler superheater in power station

Abstract

The invention belongs to the technical field of chemical cleaning and in particular relates to a dissolving-dispersing detergent for scale in pipes of a high-temperature high-pressure boiler superheater in power station. The dissolving-dispersing detergent comprises the following components in percentage by mass: 1%-4% of formic acid, 1%-6% of glycolic acid, 1%-5% of citric acid, 1%-5% of edetic acid, 0.1%-0.5% of a corrosion inhibitor, 0.1%-1% of surfactant and the balance of demineralized water. The detergent has good solubility and dispersity on iron oxide scale in the high-temperature high-pressure boiler superheater, especially has solubility and dispersity remarkably better than those of the detergent in the prior art on 12CrMoV oxide scale,. Moreover, the detergent has remarkable effects of complete cleaning and cleaning to achieve the purpose of cleaning the superheater in a circulating manner, so that the operation safety performance of the high-temperature high-pressure unit in the power station is remarkably improved, and the body safety of unit working personnel is ensured. Besides, the dissolving-dispersing detergent is suitable for cleaning a water supply system before a power station boiler, a coal saver, a water cooling wall and a superheater system.

Description

technical field [0001] The invention belongs to the technical field of chemical cleaning, and in particular relates to a cleaning agent for dissolving and dispersing scale in superheater tubes of high-temperature and high-pressure boilers in power stations. Background technique [0002] After a long period of operation of the high-temperature and high-pressure unit of the power station, a layer of scale is easily formed in the superheater tube. The main component is iron oxide. , causing damage to the leaves. At present, the boiler descaling technology mainly uses chemical cleaning, but the superheater generally adopts vertically arranged U-shaped tubes. If the cleaning residue cannot be discharged outside the boiler with the cleaning liquid, it will definitely cause a tube burst. High-temperature and high-pressure boilers generally use 12CrMoV material. Under the action of high-temperature and high-pressure steam, dense scaling is formed. It is difficult for conventional c...

AI Technical Summary

Problems solved by technology

[0002] After a long period of operation of the high-temperature and high-pressure unit of the power station, a layer of scale is easily formed in the superheater tube, and the main component is iron oxide. , causing damage to the leaves

At present, the boiler descaling technology mainly uses chemical cleaning, but the superheater generally adopts vertically arranged U-shaped tubes. If the cleaning residue cannot be discharged outside the boiler with the cleaning liquid, it will definitely cause tube explosion.

High-temperature and high-pressure boilers generally use 12CrMoV material. Under the action of high-temperature and high-pressure steam, dense scaling is formed. It is difficult for conventional cleaning agents to dissolve and remove the scale formed by this material.