Device and method for rapidly reducing dissolved oxygen in cooling water of generator stator

Abstract

The invention belongs to the nuclear power technology, and particularly relates to a device and method for rapidly reducing dissolved oxygen in cooling water of a generator stator. The device comprises a generator stator cooling water tank, a generator stator cooling water pump, a demineralized water source and a generator. The generator and the demineralized water source pipeline are in connection. According to the method, the device is utilized, the stator cooling water tank is filled with water to a specified liquid level, nitrogen purging is carried out on the generator stator cooling water tank until the oxygen content in the generator stator cooling water tank is reduced to be below 0.2%, and finally hydrogen purging is carried out on the generator stator cooling water tank. And the generator stator cooling water tank is pressurized to 30-50kPa. Corrosion of the hollow copper wire of the generator in the start-stop stage is reduced, the hollow copper wire is prevented from being reduced into simple copper in a system steel pipeline, blockage of a filter and the hollow wire is avoided, personnel operation is greatly simplified, and related industrial safety risks of stator cooling water in the start-stop stage are reduced.

Description

technical field [0001] The invention belongs to nuclear power technology, and in particular relates to a device and method for quickly reducing dissolved oxygen in cooling water of a generator stator. Background technique [0002] In order to more effectively remove the huge heat generated during generator operation, the generator stator cooling water design adopts a closed circulation system, using high-purity water to pass through copper hollow wires to remove the heat generated by the stator winding loss. The stator cooling water interface is plugged with a Teflon plastic tube and a copper hollow wire. Studies have shown that if the water quality of the cooling water of the generator stator is not up to standard, it is easy to cause corrosion of the copper wire rod of the generator. The deposition of corrosion products will not only lead to a decrease in the heat transfer capacity of the copper wire, but may also cause water blockage, water interruption, and water leakage...

AI Technical Summary

Problems solved by technology

[0010] There are the following problems, which become the major deficiencies of the advanced control method of low dissolved oxygen and neutral pH value:

[0011] 1) When the stator cooling water system is started, the hydrogen in the system is removed by filling water and exhausting it. However, there are dead corners in the system, and it is difficult to discharge the gas. Complicated operation;

[0012] 2) When the stator cooling water system is started, the dissolved oxygen content in the system cannot be reduced below the minimum required value of the national standard through multiple water filling and exhausting. It is necessary to eliminate the remaining dissolved oxygen through hydrogen-oxygen recombination after the system is started. This process generally takes a week During this period, the hollow copper wire of the generator will be corroded, and the copper in the system steel pipe will be reduced to form copper, which will lead to electrochemical corrosion;

[0013] 3) The reduced copper element may block the filter and the hollow wire, resulting in a major failure of the generator

[0015] 5) When the stator cooling water system is started, it is filled with water and exhausted, and then replaced with hydrogen and drained. The water consumption is large, and the pressure is difficult to control, and there is a risk of system overpressure;

[0016] When the stator cooling water system is started, it is filled with water and exhausted, and then filled with hydrogen and drained for gas replacement. During the hydrogen filling stage, air and hydrogen exist in the system at the same time, and there is an industrial safety risk of hydrogen-oxygen mixed explosion.

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