CN113794334A - Device and method for rapidly reducing generator stator cooling water-soluble oxygen - Google Patents
Device and method for rapidly reducing generator stator cooling water-soluble oxygen Download PDFInfo
- Publication number
- CN113794334A CN113794334A CN202111139984.8A CN202111139984A CN113794334A CN 113794334 A CN113794334 A CN 113794334A CN 202111139984 A CN202111139984 A CN 202111139984A CN 113794334 A CN113794334 A CN 113794334A
- Authority
- CN
- China
- Prior art keywords
- cooling water
- generator
- generator stator
- water tank
- stator cooling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/26—Structural association of machines with devices for cleaning or drying cooling medium, e.g. with filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/24—Protection against failure of cooling arrangements, e.g. due to loss of cooling medium or due to interruption of the circulation of cooling medium
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention belongs to the nuclear power technology, and particularly relates to a device and a method for rapidly reducing the cooling water-soluble oxygen 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 method comprises the steps of filling water into a stator cooling water tank to a specified liquid level, carrying out nitrogen purging on the stator cooling water tank of the generator until the oxygen content in the stator cooling water tank of the generator is reduced to be below 0.2%, finally carrying out hydrogen purging on the stator cooling water tank of the generator, and pressurizing the stator cooling water tank of the generator to 30-50 kPa. 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.
Description
Technical Field
The invention belongs to the nuclear power technology, and particularly relates to a device and a method 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 figure one.
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 one week of operation of the system, the dissolved oxygen level is reduced from 2000 mug/L to below 20 mug/L, the pH value is 7, and the calculated average corrosion rate of the copper is 4 g/(. square meter.d) and the maximum value 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 invention aims to provide a device and a method 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 the reliability of the operation of a stator cooling water system.
The technical scheme of the invention 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 provides a reduce generator stator cooling water soluble oxygen method fast, its utilize reduce generator stator cooling water soluble oxygen device fast, and be equipped with the parallelly connected filter of two ways on the collector ring side of generator with the pipeline that demineralized water source is connected, be equipped with the parallelly connected ion filter of two ways on the pipeline between demineralized water source and the generator stator cooling water tank, go on according to following step:
1) filling water into a stator cooling water tank to a specified liquid level;
2) performing nitrogen purging 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%;
3) and (4) performing hydrogen purging on the generator stator cooling water tank, and pressurizing the generator stator cooling water tank to 30-50 kPa.
In the step 1), after a pipeline of a gas outlet on the generator stator cooling water tank, which is communicated with a steam side port of the generator, is closed, water filling operation is carried out, the demineralized water source fills water into the generator stator cooling water tank to reach the liquid level of 900mm through the pipeline, and then the pipeline is opened for exhausting until the step 3) is completed.
And 2) purging nitrogen and starting a generator stator cooling water pump at the same time in the step 2), and stirring and degassing air in a generator stator cooling water tank until the conductivity of the cooling water in the detection pipeline is reduced to be less than 0.5 [ mu ] sm/cm.
In the step 2), the pressure of the generator is required to be increased to 0.3-1 MPa.
And 2) starting the cooling water pump of the stator of the generator and starting the filter at the same time, wherein the filtration flow is controlled to be 180 and 220L/min.
During the nitrogen purging in the step 2), the pipeline pressure of the nitrogen supply pipeline 3 is required to be maintained at 30-50 kPa.
In the nitrogen purging process in the step 2), the liquid level height in the cooling water tank of the generator stator is ensured to be 800-1100 mm.
The demineralized water is supplemented to the generator stator cooling water tank through the demineralized water source to maintain the liquid level height of the generator stator cooling water tank to be 800-1100 mm.
And 3) before hydrogen purging, closing the nitrogen supply, and replacing the gas in the generator stator cooling water tank with hydrogen from nitrogen until the generator stator cooling water tank is pressurized to 30-50 kPa.
The invention has the following remarkable effects: by means of the designed device structure and method, corrosion of the hollow copper wires of the generator in the start-stop stage is reduced, the hollow copper wires are prevented from being reduced into copper simple substances in a system steel pipeline, blocking of the filter and the hollow wires is avoided, personnel operation is greatly simplified, and related industrial safety risks of stator cooling water in the start-stop stage are 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. Rapidly reducing the dissolved oxygen below a threshold. 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.
Introducing nitrogen into a nitrogen pipeline and a nitrogen discharge pipeline, and rapidly reducing the content of dissolved oxygen in water by adopting an external nitrogen purging system head box and utilizing the Henry's law principle in a cooling water filling stage of a generator stator; in the nitrogen purging process, the stator cooling water pump is started to start stirring, oxygen in water is quickly removed, and the nitrogen is purged to the outside. Compared with the prior art, the method cancels the water filling of the system to the overflow liquid level, cancels the risky operation of hydrogen filling and water discharging, and utilizes nitrogen as an air-hydrogen replacement intermediate medium to complete the replacement of air in the system to hydrogen.
The existing stator cooling water system is filled with water to 20000mm (20m) height in the water filling stage and then drained in the hydrogen filling stage, and the subsequent water filling operation is repeatedly executed, so that a large amount of demineralized water is consumed, the method only needs to fill the water to a normal liquid level, the drainage process is avoided, and the consumption of the demineralized water is obviously saved by about 60m3(calculated according to 3 charge/discharge displacement procedures). The dissolved oxygen of the whole system can be reduced to be below 20 mug/L only 6 to 8 hours after the generator stator cooling water system is put into operation, so that the corrosion is greatly reduced, the risk of corrosion damage to a precious generator is protected, the risk of electrochemical reaction of copper ions at a system heat exchanger filter and the like is avoided, and the reliability of major equipment of a power plant is improved; the complex steps of repeated water filling, air exhausting, hydrogen filling and water draining are eliminated, the overpressure risk of the system is reduced, the system operation time is reduced by more than 24 hours, and the unit shutdown maintenance period is reduced; by using nitrogen as an intermediate medium, residual air at corners of the system is completely replaced, hydrogen pressurization is well connected, and hydrogen-oxygen mixed industrial safety air is reducedAnd (5) risking.
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 invention 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.
In the process, 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;
the method for rapidly reducing the cooling water-soluble oxygen of the generator stator by using the device comprises the following steps:
step 1, filling water into a stator cooling water tank 1 to reach the liquid level of 900mm
In operation, the exhaust line 4 is closed by a valve, and a drain exhaust valve is installed on the exhaust line 4, and the drain exhaust valve is closed to close the exhaust line 4, and then the water filling operation is performed.
The method comprises the following steps of (1) filling water into a generator stator cooling water tank 1 from a demineralized water source 8 through a pipeline to reach the liquid level of 900 mm;
then, the valve of the exhaust line 4 is opened to exhaust, and the valve of the exhaust line 4 is kept open until the gas replacement is completed (hydrogen replacement is completed).
Opening a nitrogen supply pipeline 3, purging nitrogen to the generator stator cooling water tank 1, starting a generator stator cooling water pump 2 to stir, and taking air in the whole device into the generator stator cooling water tank 1 to degas so as to finish the replacement of the gas in the device from the air to the nitrogen; until the conductivity of the cooling water in the detection pipeline (generally, the pipeline at the section before the generator 9 after the generator stator cooling water pump 2 is detected) is reduced to below 0.5 mu sm/cm
The pressure of the generator 9 is required to be increased to 0.3-1MPa, the pressure of a stator cooling water system (the part except a nitrogen supply pipeline 3, a hydrogen supply pipeline 5, an exhaust pipeline 4 and a nitrogen storage tank 10 in the device) is prevented from being higher than that of the generator after the stator cooling water system is started, and the stator cooling water leaks into the generator 9;
the stator cooling water pump was started at nitrogen purge. The generator stator cooling water pump 2 is in a starting state, the filter 7 is started at the same time, the filtering flow is controlled to be 180 plus 220L/min, the optimal control is 200L/min, and impurities in the cooling water are removed;
in addition, a nitrogen supply pipeline 3 is connected to introduce nitrogen into the generator stator cooling water tank 1 for purging, the pressure of the water tank is controlled by a nitrogen supply valve on the nitrogen supply pipeline 3, and the pipeline pressure is required to be maintained at 30-50 kPa;
in the process, the liquid level height in the stator cooling water tank 1 must be ensured to be 800-; the liquid level of the stator cooling water tank 1 can be maintained by supplementing demineralized water through the demineralized water source 8.
Air that exists in generator stator cooling water tank 1 is continuously blown off exhaust pipe line 4 after nitrogen gas is supplied, behind generator stator cooling water pump 2, utilize the muddy effect of pump to take out the air that pipeline and generator stator are interior to be detained and send into generator stator cooling water tank 1, and then follow the nitrogen gas flow and discharge together, the gas of aquatic dissolved takes place acutely to mix when the return water is to the water tank, separate out from the stator cooling water in, through above principle, can reduce the dissolved oxygen content in the stator cooling water system fast.
The filter 7 adopts a resin filter, and the conductivity of the cooling water is rapidly reduced from 1.5 mu sm/cm to below 0.5 mu sm/cm on the pipeline through detection equipment.
According to henry's law, the partial pressure of a gas in a sealed container at a certain temperature is proportional to the molarity of the gas dissolved in a solution. If the dissolved oxygen content in the stator cooling water system is 20. mu.g/L, it can be said that the partial pressure of oxygen in the stator cooling water tank has decreased to a very low level (1/400 below atmospheric pressure, i.e., 250Pa absolute).
According to the Dalton's partial pressure law, for an ideal gas or a low-pressure gas (in this example, the total pressure is 30-50kPa with a nitrogen purge in tank 1, and the absolute pressure is 130-150kPa), in any gas mixture in a vessel, if no chemical reaction occurs between the components, each gas is uniformly distributed throughout the vessel, and the pressure generated by it is the same as that generated when it occupies the entire vessel alone. Accordingly, it can be calculated that, at this time, the percentage of the oxygen content in the stator cooling water tank 1 is 0.2% at 250Pa/140kPa, and the nitrogen content is 99.8% or more, that is, when the oxygen content in the stator cooling water tank 1 is reduced to 0.2% or less by nitrogen purging, the dissolved oxygen content in the stator cooling water tank will meet the requirement.
In the process, the gas in the stator cooling water tank 1 is continuously swept and replaced by nitrogen, the proportion of the oxygen, carbon dioxide and other impurity gases in the gas space of the water tank is exponentially reduced, and the content of the dissolved oxygen and the content of the dissolved carbon dioxide in the corresponding stator cooling water are also exponentially reduced until the requirements are met.
And 3, after the dissolved oxygen of the stator cooling water system is qualified (lower than 20 mug/L), performing hydrogen purging on the generator stator cooling water tank 1 to finish the replacement of gas in the system from nitrogen to hydrogen
The premise of starting the step 3 is that the stator cooling water system is replaced by nitrogen, and the dissolved oxygen content in cooling water in the pipeline is detected to be lower than 20 mug/L;
the nitrogen supply line 3 is closed, and the nitrogen purging is stopped;
then, introducing hydrogen into the generator stator cooling water tank 1 through the hydrogen supply pipeline 5 for 10min, and replacing the gas in the water tank with hydrogen from nitrogen, wherein the replacement is completed when the concentration of the hydrogen in the stator cooling water tank is more than 98%
Finally, the valves on the hydrogen supply line 5 and the exhaust line 4 are closed, and the replacement is completed.
In this step, the generator stator cooling water tank 1 is pressurized to 30 to 50kPa through the hydrogen supply line 5.
Claims (16)
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 parallel filters (7) 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).
8. A method for rapidly reducing the cooling water-soluble oxygen of the stator of the generator, which is characterized in that the device for rapidly reducing the cooling water-soluble oxygen of the stator of the generator according to claim 1 is utilized, two parallel filters (7) are arranged on a pipeline connecting the collector ring side of the generator (9) and the demineralized water source (8), two parallel ion filters (11) are arranged on a pipeline between the demineralized water source (8) and the cooling water tank (1) of the stator of the generator, and the method comprises the following steps:
1) filling water into a generator stator cooling water tank (1) to a specified liquid level;
2) nitrogen purging is carried out on the generator stator cooling water tank (1) until the oxygen content in the generator stator cooling water tank (1) is reduced to be below 0.2%;
3) and (3) performing hydrogen purging on the generator stator cooling water tank (1), and pressurizing the generator stator cooling water tank (1) to 30-50 kPa.
9. The method for rapidly reducing the oxygen dissolved in the cooling water of the generator stator according to claim 8, wherein the method comprises the following steps: in the step 1), after a gas outlet connecting pipeline on the generator stator cooling water tank (1) is closed, water filling operation is carried out, the demineralized water source (8) fills water into the generator stator cooling water tank (1) to reach the liquid level of 900mm through the pipeline, and then the pipeline is opened to exhaust until the step 3) is completed.
10. The method for rapidly reducing the oxygen dissolved in the cooling water of the generator stator as claimed in claim 9, wherein the method comprises the following steps: and in the step 2), nitrogen purging is carried out, a generator stator cooling water pump (2) is started at the same time, and air in a generator stator cooling water tank (1) is stirred and degassed until the conductivity of cooling water in a detection pipeline is reduced to be below 0.5 mu sm/cm.
11. The method for rapidly reducing the oxygen dissolved in the cooling water of the generator stator as claimed in claim 10, wherein the method comprises the following steps: in the step 2), the pressure of the generator (9) is required to be increased to 0.3-1 MPa.
12. The method for rapidly reducing the oxygen dissolved in the cooling water of the generator stator as claimed in claim 10, wherein the method comprises the following steps: and (3) starting the generator stator cooling water pump (2) in the step 2) and starting the filter (7), wherein the flow rate of the filter is controlled to be 180 and 220L/min.
13. The method for rapidly reducing the oxygen dissolved in the cooling water of the generator stator as claimed in claim 10, wherein the method comprises the following steps: during the nitrogen purging in the step 2), the pipeline pressure of the nitrogen supply pipeline (3) is required to be maintained at 30-50 kPa.
14. The method for rapidly reducing the oxygen dissolved in the cooling water of the generator stator as claimed in claim 10, wherein the method comprises the following steps: in the nitrogen purging process in the step 2), the liquid level height in the generator stator cooling water tank (1) is ensured to be 800-1100 mm.
15. The method for rapidly reducing the oxygen dissolved in the cooling water of the generator stator according to claim 14, wherein the method comprises the following steps: supplementing demineralized water to the generator stator cooling water tank (1) through the demineralized water source (8) to maintain the liquid level height of the generator stator cooling water tank (1) at 800-1100 mm.
16. The method for rapidly reducing the oxygen dissolved in the cooling water of the generator stator as claimed in claim 10, wherein the method comprises the following steps: and 3) before hydrogen purging, closing the nitrogen supply, and replacing the gas in the generator stator cooling water tank (1) with hydrogen from nitrogen until the pressure of the generator stator cooling water tank (1) is increased to 30-50 kPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111139984.8A CN113794334A (en) | 2021-09-28 | 2021-09-28 | Device and method for rapidly reducing generator stator cooling water-soluble oxygen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111139984.8A CN113794334A (en) | 2021-09-28 | 2021-09-28 | Device and method for rapidly reducing generator stator cooling water-soluble oxygen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113794334A true CN113794334A (en) | 2021-12-14 |
Family
ID=79184485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111139984.8A Pending CN113794334A (en) | 2021-09-28 | 2021-09-28 | Device and method for rapidly reducing generator stator cooling water-soluble oxygen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113794334A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115124161A (en) * | 2022-05-13 | 2022-09-30 | 华能山东发电有限公司烟台发电厂 | Method for prolonging resin service cycle of generator rotor cooling water treatment device |
-
2021
- 2021-09-28 CN CN202111139984.8A patent/CN113794334A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115124161A (en) * | 2022-05-13 | 2022-09-30 | 华能山东发电有限公司烟台发电厂 | Method for prolonging resin service cycle of generator rotor cooling water treatment device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20050183948A1 (en) | Apparatus and method for reducing instances of pump de-priming | |
| CN105551534A (en) | Reactor coolant chemical and volume control system and control method thereof | |
| CN212404297U (en) | Circulating water utilization device in electrolytic hydrogen production process | |
| CN113794334A (en) | Device and method for rapidly reducing generator stator cooling water-soluble oxygen | |
| CN110379597A (en) | The online oil-supplementing system of nuclear power station oil-immersed transformer and online oil supplement method | |
| CN113699537A (en) | Differential pressure type pure water electrolysis hydrogen production system | |
| CN102435546A (en) | Supercritical autoclave bubbling deoxygenation system | |
| CN216086407U (en) | Device for rapidly reducing dissolved oxygen in generator stator cooling water | |
| CN215831669U (en) | Solid hydrogen and hydrogen terminal pressurization scheme | |
| CN211987221U (en) | Vacuum degassing and purifying device for inlet belt pressure type sealing oil | |
| CN205332636U (en) | A automatic water supply device for valve room water cooling system | |
| CN104864765B (en) | Vacuum water feeding system of cooling tower | |
| CN206940991U (en) | A kind of automatic starting device of ion film caustic soda system reserve pump | |
| CN111570430B (en) | Nuclear power station generator stator cooling system and anaerobic demineralized water flushing and replacing method thereof | |
| CN100999338A (en) | Power generator internal cooling water oxygen removal or electrolemma microalkalination treatment device and its treatment method | |
| CN204574918U (en) | Cooling tower vacuum water-feeding system | |
| CN209104975U (en) | A kind of Generator Stator Cooling water system anti-siphon means | |
| CN107055742B (en) | Desalination method and system for supercritical water oxidation of organic wastewater | |
| CN2730854Y (en) | Vacuum deoxygenizer for boiler water | |
| CN1328841C (en) | Generator internal cold water qality treatment method and its device | |
| CN217483952U (en) | Airtight sampler of gaseous material in polycrystalline silicon production | |
| CN218774227U (en) | Equipment for producing deoxidized fire-fighting water | |
| CN216528338U (en) | Online oil filtering and changing system of transformer | |
| CN203295282U (en) | Anticorrosion device for internal cooling water system of generator | |
| CN219180202U (en) | Reactor waste heat discharging and purifying system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |