CN216086407U - Device for rapidly reducing dissolved oxygen in generator stator cooling water - Google Patents
Device for rapidly reducing dissolved oxygen in generator stator cooling water Download PDFInfo
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- CN216086407U CN216086407U CN202122355830.4U CN202122355830U CN216086407U CN 216086407 U CN216086407 U CN 216086407U CN 202122355830 U CN202122355830 U CN 202122355830U CN 216086407 U CN216086407 U CN 216086407U
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Abstract
The utility model belongs to nuclear power technology, and particularly relates to a device for rapidly reducing the dissolved oxygen of a generator stator cooling water, which comprises a generator stator cooling water tank, a generator stator cooling water pump, a demineralized water source, a generator and a generator connected with the demineralized water source through a pipeline.
Description
Technical Field
The utility model belongs to the nuclear power technology, and particularly relates to a device for rapidly reducing the cooling water-soluble oxygen of a generator stator.
Background
In order to more effectively take away huge heat generated during the operation of the generator, the cooling water of the stator of the generator adopts a closed circulating system in design, and high-purity water is used for taking away the heat generated by the loss of the stator winding through a copper hollow lead. The cooling water interface of the stator is formed by splicing a Teflon plastic pipe and a copper hollow lead. Research shows that if the quality of cooling water of a generator stator does not reach the standard, a generator copper wire rod is easy to corrode, corrosion product deposition can not only cause the heat transfer capacity of a copper wire to be reduced, but also can cause water plugging, water cut-off and water leakage accidents, cause overheating of a stator winding, even cause serious accidents such as burning of the end part of the stator winding and the like. The main factors influencing the corrosion of the hollow copper conductor of the generator stator comprise the dissolved oxygen content, the pH value, the conductivity and the like of a cold water system, and when the pH value of a system medium is neutral, the dissolved oxygen concentration becomes a determining factor influencing the corrosion of a stator coil.
When the oxygen content of the desalted water is less than 0.1mg/L, the lower the oxygen content is, the less the copper is corroded in the desalted water; when the oxygen content is 0.1-0.5 mg/L, the corrosion of copper has a maximum value; with the further increase of the dissolved oxygen content of more than 0.5mg/L, the corrosion of the formed oxide film is reduced. Therefore, the control of the water quality of the cooling water of the stator of the generator by controlling the dissolved oxygen becomes a relatively efficient choice. See fig. 1.
The unit for controlling dissolved oxygen limits the oxygen content to an extremely low level as much as possible to control corrosion. The advanced scheme adopted by the QFSN type generator is that hydrogen is adopted to pressurize and seal a stator cooling water tank, so that air is prevented from entering the stator cooling water tank, the oxygen content and the carbon dioxide content of cooling water are increased, and a large amount of high-concentration hydrogen is filled in the system to keep low dissolved oxygen.
During the operation of the generator, hydrogen in the generator continuously and slowly leaks to the stator cooling water system through Teflon plastic and the like and overflows to the stator cooling water tank, so that the cooling water tank is kept to effectively supplement the hydrogen loss all the time, high-purity hydrogen is covered, and the micro dissolved oxygen in water can be removed slowly. In this way, hydrogen pressurization is used to reduce dissolved oxygen and limit corrosion. The advantages are as follows:
the method has the advantages that hydrogen gas pressure in the generator is greater than cooling water pressure of a stator winding, the hydrogen gas slightly permeates into the cooling water, and if the generator is sealed by nitrogen gas, nitrogen purging is frequently carried out and the hydrogen concentration of a water tank is monitored; the hydrogen is used for sealing, the two media are consistent, the interference amount is small, and the maintenance amount is small;
the system can be operated in a completely closed mode by virtue of the sealing of the hydrogen, the cooling water tank and the water return pipeline are filled with the hydrogen, and the reliability is improved in the completely closed operation.
The biggest problem occurs during the system start-up phase: when the system is overhauled before being stopped, the equipment pipeline is in an empty state, a large amount of air exists, the desalted water is filled into the equipment pipeline to form saturated oxygen-dissolved water, and severe corrosion can be caused to the copper stator coil after the system is started.
According to the traditional method, when the stator cooling water system is started, the system is filled with demineralized water, when the liquid level is higher than that of a stator coil of the generator and overflows, air in the system is discharged, then the water tank is filled with hydrogen, meanwhile, the water level of the system is reduced to a normal value, and then the stator cooling water pump is started to finish operation of the system.
The following problems exist, which become important disadvantages of the advanced control method of low dissolved oxygen and neutral pH value:
1) when the stator cooling water system is started, hydrogen in the system is removed by a water filling and exhausting method, but dead angles exist in the system, gas is difficult to remove, a pump needs to be started for many times to stir, then the water filling and exhausting method is carried out again, and the operation is complex;
2) when a stator cooling water system is started, water is filled for many times for exhaust, the content of dissolved oxygen in the system cannot be reduced to be below the minimum requirement value of the national standard, residual dissolved oxygen is eliminated through hydrogen-oxygen compounding after the system is started, the process generally needs a week, during the process, hollow copper wires of a generator are corroded, and a steel pipeline of the system is reduced to form a copper simple substance, so that electrochemical corrosion is caused;
3) the reduced copper element may clog the filter and the hollow conductor, resulting in significant generator failure.
4) Generally, after the system is put into operation for one week, the dissolved oxygen level is reduced from 2000 mu g/L to below 20 mu g/L, the pH value is 7, the calculated average corrosion rate of copper is 4 g/square meter, and the maximum corrosion rate is 7 g/square meter
D). The corrosion rate is higher than 3 times when the oxygen content is 20 mu g/L than the standard value, and is higher than 7 times when the oxygen content is 7 mu g/L than the normal operation;
5) when the stator cooling water system is started, gas replacement is carried out in a mode of water filling, gas exhausting and then hydrogen filling and water draining, water consumption is high, pressure is difficult to control, and the risk of overpressure of the system exists;
when the stator cooling water system is started, gas replacement is carried out in a water filling and exhausting mode and then a hydrogen filling and draining mode, and in the hydrogen filling stage, air and hydrogen exist in the system at the same time, so that the industrial safety risk of hydrogen-oxygen mixed explosion exists.
Disclosure of Invention
The utility model aims to provide a device for quickly reducing the dissolved oxygen in the stator cooling water of a generator, which can quickly reduce the dissolved oxygen in the starting stage of the stator cooling water and improve the stability and reliability of the operation of a stator cooling water system.
The technical scheme of the utility model is as follows:
a device for rapidly reducing the cooling water dissolved oxygen of a generator stator comprises a generator stator cooling water tank, a generator stator cooling water pump and a demineralized water source which are connected with an outlet pipeline at the lower part of the generator stator cooling water tank, and a generator which is connected with an inlet pipeline at the upper part of the generator stator cooling water tank; the collector ring side of the generator is connected with the demineralized water source pipeline; the two generator stator cooling water pumps are arranged on a pipeline at the outlet of the lower part of the generator stator cooling water tank in parallel, two paths of heat exchangers in parallel connection are arranged on an outlet pipeline of the generator stator cooling water pump, and the outlets of the heat exchangers are communicated with a pipeline between the generator and the demineralized water source; an inlet at the upper part of the generator stator cooling water tank is connected with a nitrogen supply pipeline and a hydrogen supply pipeline; the generator stator cooling water tank is provided with a gas outlet communicated with a steam side port of the generator.
Two parallel filters are arranged on a pipeline connecting the collector ring side of the generator and the demineralized water source.
Two paths of ion filters connected in parallel are arranged on a pipeline between the demineralized water source and the generator stator cooling water tank.
The generator is internally provided with two water collecting pipes which are connected in parallel and are arranged at two ends of the stator winding, all the stator windings are connected to the water collecting pipes, and the parallel-connected junction points of the water collecting pipes are respectively communicated with the excitation side port and the steam side port of the generator.
The generator stator cooling water tank stores stator cooling water for the stator cooling water pump to extract and use when supplying cooling water to the stator in the generator, and the generator stator cooling water pump can stir media in the stator cooling water tank to discharge gas dissolved in water.
The nitrogen supply pipeline comprises a nitrogen storage tank which supplies nitrogen to the stator cooling water tank, a gas outlet on the generator stator cooling water tank, which is communicated with a steam side port of the generator, is connected with an exhaust pipeline, and the nitrogen supply pipeline and the exhaust pipeline perform nitrogen purging and gas replacement in the generator stator cooling water tank.
The hydrogen supply pipeline and the exhaust pipeline perform hydrogen purging and gas replacement in the generator stator cooling water tank.
The utility model has the following effects: the corrosion of the hollow copper conductor of the generator in the start-stop stage is reduced, the hollow copper conductor is prevented from being reduced into a copper simple substance in a system steel pipeline, the filter and the hollow conductor are prevented from being blocked, the personnel operation is greatly simplified, and the related industrial safety risk of stator cooling water in the start-stop stage is reduced.
Through improving the deoxidization mode of stator cooling water, realize following technological effect: 1. solves the problem of high dissolved oxygen in the supply water. 2. Removing the air resident in the system pipeline. 3. Quickly reducing the dissolved oxygen. 4. The safety risk of oxygen and hydrogen existing in the system at the same time is avoided. 5. Reduce the corrosion of the hollow copper wire of the generator and prevent the hollow copper wire from being reduced into a copper simple substance in a system steel pipeline.
Drawings
FIG. 1 is a schematic view of an apparatus for rapidly reducing the cooling water dissolved oxygen of a generator stator;
in the figure: 1. a generator stator cooling water tank; 2. a generator stator cooling water pump; 3. a nitrogen supply line; 4. an exhaust line; 5. a hydrogen supply line; 6. a heat exchanger; 7. a filter; 8. a source of demineralized water; 9. a generator; 10, a nitrogen storage tank; 11. an ion filter.
Detailed Description
The utility model is further illustrated by the accompanying drawings and the detailed description.
As shown in fig. 1, the improved device for rapidly reducing the cooling water-soluble oxygen of the generator stator comprises a generator stator cooling water tank 1, a generator stator cooling water pump 2 and a demineralized water source 8, wherein the generator stator cooling water pump and the demineralized water source are connected with an outlet at the lower part of the generator stator cooling water tank 1 through a pipeline, and a generator 9 is connected with an inlet at the upper part of the generator stator cooling water tank 1 through a pipeline; the collector ring side of the generator 9 is connected with a demineralized water source 8 through a pipeline, and two paths of filters 7 connected in parallel are arranged on the pipeline;
two paths of ion filters 11 connected in parallel are mounted on a pipeline between a demineralized water source 8 and a generator stator cooling water tank 1, two generator stator cooling water pumps 2 are mounted on a pipeline at the lower outlet of the generator stator cooling water tank 1 in parallel, two paths of heat exchangers 6 connected in parallel are mounted on an outlet pipeline of the generator stator cooling water pump 2 on the pipeline, and the outlet of each heat exchanger 6 is communicated with a pipeline between the generator 9 and the demineralized water source 8;
a nitrogen storage tank 10 is installed at the upper inlet of the generator stator cooling water tank 1 through a nitrogen supply line 3, a hydrogen supply line 5 is installed at the other upper inlet, and an exhaust line 4 is installed at the upper process gas outlet, wherein the exhaust line 4 is communicated with the steam side port of the generator 9.
Two water collecting pipes are arranged in the generator 9 and are arranged at two ends of the stator winding, all the stator windings are connected to the water collecting pipes through insulating hoses, the water collecting pipes are connected in parallel, and the junction points at the two ends are respectively communicated with an excitation side (collector ring side) port and a steam side port of the generator 9;
the generator stator cooling water pump 2 has two parallel configurations, the inlet of the pump is connected with the generator stator cooling water tank 1, the outlet of the pump is connected with the heat exchanger 6, the two heat exchangers 6 are connected in parallel, one heat exchanger is used for cooling water, and the other heat exchanger is redundant and standby. The cooling water then flows through the filters 7, which remove possible entering impurities before it reaches the stator winding and then reaches the collector tube on the excitation side, the two filters 7 being connected in parallel, one operating and the other redundant for the same purpose of increasing the reliability.
The generator 9 is provided with two water collecting pipes, and the desalted water from the stator cooling water pump 2 flows through an empty wire of the stator winding through the collecting pipe, flows out of the collecting pipe at the steam end and flows back to the generator stator cooling water tank 1. The heat generated by the stator winding losses is carried away by the high purity water circulation of the stator windings.
When the liquid level of the stator cooling water tank 1 is reduced, the demineralized water source 8 supplies demineralized water to the stator cooling water tank 1, and the water volume of the whole system is ensured.
The generator stator cooling water tank 1 stores stator cooling water for the extraction and use when the stator cooling water pump 2 operates. The generator stator cooling water pump 2 extracts the medium in the stator cooling water tank 1 to supply cooling water to the stator in the generator 9, and meanwhile, the generator stator cooling water pump 2 can stir the medium in the stator cooling water tank 1, so that the gas dissolved in the water is rapidly removed. The heat exchanger 6 provides a cold source, the temperature of stator cooling water (cooling water entering a generator stator after flowing out of the stator cooling water tank 1) is kept, and the filter 7 continuously filters impurities in the stator cooling water.
Part of the cooling water in the generator stator cooling water tank 1 is subjected to ion resin filtration through an ion filter 11, so that the conductivity of the cooling water is reduced.
The effect of providing the nitrogen supply line 3, the hydrogen supply line 5, the exhaust line 4 and the nitrogen storage tank 10 is:
the nitrogen supply pipeline 3 supplies nitrogen to the stator cooling water tank 1 and works together with the exhaust pipeline 4, so that continuous gas flow can be realized, and nitrogen purging is realized; the hydrogen supply line 5 supplies hydrogen to the generator stator cooling water tank 1, and hydrogen supply and hydrogen replacement are achieved. The nitrogen storage tank 10 provides a nitrogen source and supplies nitrogen to the generator stator cooling water tank 1 through a nitrogen supply line 3. The exhaust pipeline 4 exhausts the gas to the generator stator cooling water tank 1, and works together with the nitrogen supply pipeline 3 and the hydrogen supply pipeline 5, so that the continuous flow of the gas can be realized, and the exhaust of air, nitrogen and hydrogen is realized.
Claims (7)
1. The utility model provides a reduce generator stator cooling water oxygen dissolving device fast which characterized in that: the device comprises a generator stator cooling water tank (1), a generator stator cooling water pump (2) and a demineralized water source (8) which are connected with an outlet pipeline at the lower part of the generator stator cooling water tank (1), and a generator (9) which is connected with an inlet pipeline at the upper part of the generator stator cooling water tank (1); the collector ring side of the generator (9) is connected with the demineralized water source (8) through a pipeline; the number of the generator stator cooling water pumps (2) is two, the two generators are arranged on a pipeline at the lower outlet of the generator stator cooling water tank (1) in parallel, two paths of heat exchangers (6) in parallel are arranged on an outlet pipeline of the generator stator cooling water pump (2), and the outlet of each heat exchanger (6) is communicated with a pipeline between the generator (9) and the demineralized water source (8); an inlet at the upper part of the generator stator cooling water tank (1) is connected with a nitrogen supply pipeline (3) and a hydrogen supply pipeline (5); the generator stator cooling water tank (1) is provided with a gas outlet communicated with a steam side port of the generator (9).
2. The device for rapidly reducing the cooling water-soluble oxygen of the generator stator as claimed in claim 1, wherein: two paths of filters (7) connected in parallel are arranged on a pipeline connecting the collector ring side of the generator (9) and the demineralized water source (8).
3. The device for rapidly reducing the cooling water-soluble oxygen of the generator stator as claimed in claim 1, wherein: two paths of ion filters (11) connected in parallel are arranged on a pipeline between the demineralized water source (8) and the generator stator cooling water tank (1).
4. The device for rapidly reducing the cooling water-soluble oxygen of the generator stator as claimed in claim 1, wherein: two water collecting pipes which are connected in parallel are arranged in the generator (9) and are arranged at two ends of the stator windings, all the stator windings are connected to the water collecting pipes, and the parallel-connected junction points of the water collecting pipes are respectively communicated with an excitation side port and a steam side port of the generator (9).
5. The device for rapidly reducing the cooling water-soluble oxygen of the generator stator as claimed in claim 1, wherein: the generator stator cooling water tank (1) stores stator cooling water for the generator stator cooling water pump (2) to supply cooling water to the stator in the generator (9), and the generator stator cooling water pump (2) can stir the medium in the generator stator cooling water tank (1) to discharge the gas dissolved in water.
6. The device for rapidly reducing the cooling water-soluble oxygen of the generator stator as claimed in claim 1, wherein: the nitrogen supply pipeline (3) comprises a nitrogen storage tank (10) which supplies nitrogen to the generator stator cooling water tank (1), an air outlet which is communicated with a steam side port of the generator (9) on the generator stator cooling water tank (1) is connected with an exhaust pipeline (4), and the nitrogen supply pipeline (3) and the exhaust pipeline (4) perform nitrogen purging and air replacement in the generator stator cooling water tank (1).
7. The device for rapidly reducing the cooling water-soluble oxygen of the generator stator as claimed in claim 6, wherein: the hydrogen supply pipeline (5) and the exhaust pipeline (4) perform hydrogen purging and gas replacement to the generator stator cooling water tank (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122355830.4U CN216086407U (en) | 2021-09-28 | 2021-09-28 | Device for rapidly reducing dissolved oxygen in generator stator cooling water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122355830.4U CN216086407U (en) | 2021-09-28 | 2021-09-28 | Device for rapidly reducing dissolved oxygen in generator stator cooling water |
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| Publication Number | Publication Date |
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| CN216086407U true CN216086407U (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122355830.4U Active CN216086407U (en) | 2021-09-28 | 2021-09-28 | Device for rapidly reducing dissolved oxygen in generator stator cooling water |
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| CN (1) | CN216086407U (en) |
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2021
- 2021-09-28 CN CN202122355830.4U patent/CN216086407U/en active Active
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