Cleaning technology of generator rotor water cooling system

Abstract

The invention provides a cleaning technology of a generator rotor water cooling system. The generator rotor water cooling system is washed through forward and backward circulation washing and is subjected to the processes of system preheating, alkaline washing, water washing after alkaline washing, slow release in advance, acid pickling, water washing after acid pickling, pre-filming and water washing after pre-filming, so that the generator rotor water cooling system is washed. Compared with the prior art, the cleaning technology has the advantages that scale and corrosion deposition product copper oxide of the inner surface of a hollow core copper conductor of a rotor are removed through chemical cleaning, the water-passing capacity of the hollow core conductor is recovered, the heat exchange efficiency of the conductor is improved, the operation temperature and the temperature difference of a rotor coil are reduced, and the operation safety of a generator is guaranteed; the cleaning rate of the corrosion product of the hollow core copper conductor of the rotor of the generator is over 99%, and the phenomenon that due to the fact that cleaning is not thorough, secondary corrosion is caused is avoided; the technology is simple, cost is low, and the discharged washing water is discharged without pollution; energy consumption of a power plant is reduced and large economic benefits are generated.

Description

technical field [0001] The invention relates to a cleaning process of a generator rotor water cooling system. Background technique [0002] For coal-fired generators, the cooling system is generally a double water-cooled cooling system, and the rotor winding of the double-water internal cooling cooling method is water internal cooling. The factory test pressure of the internal cooling water system of the stator and rotor windings is 1MPa; the water pressure after installation is 0.75MPa. Since it was put into operation, the relevant cooling technical parameters of the cooling water in the rotor often cannot achieve normal operation. The flow rate of the rotor system is changed from the original 30m 3 / h down to 20m 3 / h. The PH value does not meet the specification requirements, resulting in corrosion of the copper wire rod, and the continuous deposition of copper ions, resulting in difficulty in heat transfer of the wire rod and affecting the cooling effect. Seriously ...

AI Technical Summary

Problems solved by technology

The PH value does not meet the specification requirements, resulting in corrosion of the copper wire rod, and the continuous deposition of copper ions, resulting in difficulty in heat transfer of the wire rod and affecting the cooling effect

Seriously affect the normal, safe and effective operation of the generating set

Analysis of the particles in the flushing shows that the oxidized ketone content exceeds 95%, which is the corrosion product of the hollow copper wire of the rotor, so that the hollow wire of the rotor of the generator will be blocked, and the consequence is that the water flow of the generator stator water cooling system is insufficient, resulting in the generator The heat cannot be dissipated, the load of the generator cannot be kept up, and the power generation decreases, resulting in energy loss

The main substance that causes the clogging of the hollow wire of the generator rotor is copper oxide. Once the copper oxide corrosion occurs in the hollow wire of the generator rotor, it is difficult to remove it. The common method is to use compressed air to blow back, often the effect is very unsatisfactory and cannot be completely removed. Remove the copper oxide corrosion products, and put them into operation again. If the copper oxide corrosion products are not completely removed, the hollow copper wire will be corroded again, which will cause great hidden dangers to the safe production and power generation of the unit.

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