Method for solving obstruction of hollow lead of generator stator bar and inhibiting corrosion of hollow lead

Abstract

The invention discloses a method for solving the obstruction of a hollow lead of a generator stator bar and inhibiting the corrosion of the hollow lead. The method comprises the following steps: pickling for descaling, activating, and prefilming, wherein a composite acid used in the pickling step comprises, by weight, 65-92 parts of aminosulfonic acid and 8-35 parts of hydrofluoric acid, and a prefilming agent used in the prefilming step comprises, by weight, 35-45 parts of tolyltriazole, 40-44 parts of 2-mercaptobenzothiazole, 10-25 parts of benzotriazole and 10-15 parts of hydroxypropyl methyl cellulose. The method can realize the thorough solving of copper corrosion deposits adhered in the hollow lead and the formation of a firm molecular film in the hollow lead without corroding other metal materials in the cooling water system of the generator stator, effectively prevents the direct contact of copper atoms with cooling water, and substantially inhibits the electrochemical corrosion of copper in the cooling water with a low pH value.

Description

technical field [0001] The invention specifically relates to a method for solving the blockage of the hollow wire of the stator bar of the generator and inhibiting the corrosion. Background technique [0002] The generator is the final function-to-function conversion platform of the power station. With the continuous increase of the unit capacity, the heat release effect during the function-to-function conversion will also increase accordingly. Therefore, in order to ensure the safe and economical operation of the unit, the cooling of the generator becomes It is extremely important. In order to meet the cooling requirements, generally large-scale generators use the cooling method of internal water cooling of the stator bar. While the cooling problem is successfully solved, new problems have emerged, mainly due to the damage to the hollow wires during the operation of the internal cooling water system. The problem of corrosion and corrosion product precipitation blocking holl...

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Problems solved by technology

At present, the commonly used methods such as air purging, desalinated water boost flushing, nitrogen + desalted water two-phase flow water hammer, etc., cannot completely solve the clogging problem, and because the boosting will cause certain damage to the stator bar, so the risk bigger

[0003] The structure of the cooling water system for the stator bar of the generator is complicated, and there are more than a dozen kinds of metal materials. At present, the same pickling solution is used to clean the blocked hollow wire of the stator bar, but there are different degrees of corrosion inhibition of other metals by the same pickling solution. The problem is that the use time of the hollow wire is shortened, which is a technical difficulty in using a single pickling solution at present. Although composite pickling is also used for hollow wires, there is a problem of incomplete cleaning; using the existing The molecular film formed in the hollow wire by the pre-film method is easily washed and dissolved. After the unit is started, the copper ion content in the cooling water of the stator bar seriously exceeds the standard. Excessive copper ions will cause the problem of excessive leakage current of the generator. At present, there is no such method Thorough cleaning and the formation of a firm molecular film is a method to solve the problem of blockage of the hollow wire of the stator bar of the generator

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