CN111570430A - Nuclear power station generator stator cooling system and anaerobic demineralized water flushing and replacing method thereof - Google Patents
Nuclear power station generator stator cooling system and anaerobic demineralized water flushing and replacing method thereof Download PDFInfo
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- CN111570430A CN111570430A CN202010334689.7A CN202010334689A CN111570430A CN 111570430 A CN111570430 A CN 111570430A CN 202010334689 A CN202010334689 A CN 202010334689A CN 111570430 A CN111570430 A CN 111570430A
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- water
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- desalting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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Abstract
The invention belongs to the technical field of generators of nuclear power plants and auxiliary systems thereof, and particularly relates to a stator cooling system of a generator of a nuclear power plant and an anaerobic desalted water flushing and replacing method thereof, wherein the anaerobic desalted water flushing and replacing method of the stator cooling system of the generator of the nuclear power plant comprises the following steps: a first rinsing and replacing stage: closing a water inlet and a water outlet of the desalting pipeline, injecting oxygen-free desalting water into the circulating pipeline through the injection port, and discharging the oxygen-free desalting water through the water outlet so as to carry out oxygen-free desalting water flushing replacement operation on the circulating pipeline; a second flushing and replacing stage: and opening a water inlet and a water outlet of the desalting pipeline, continuously injecting oxygen-free desalting water into the circulating pipeline through the injection port, and discharging the oxygen-free desalting water through the water outlet so as to carry out oxygen-free desalting water flushing and replacing operation on the circulating pipeline and the desalting pipeline. The invention can effectively avoid the obvious reduction of the purification capacity of the salt bed, improve the washing and replacing efficiency and reduce the time required by washing and replacing.
Description
Technical Field
The invention belongs to the technical field of generators of nuclear power plants and auxiliary systems thereof, and particularly relates to a stator cooling system of a generator of a nuclear power plant and an anaerobic demineralized water flushing and replacing method thereof.
Background
The nuclear power station generator stator cooling system comprises a circulating pipeline, a circulating pump, a desalting pipeline and a desalting bed. In order to cool the stator of the engine, the circulating pipeline passes through the circulating pump, the stator of the generator and the cooler, heat is absorbed by the stator of the generator, the heat is exchanged to the cooler at the cooler, and the circulating pump is used for driving cooling water to circularly flow in the circulating pipeline. The circulating pipeline and the pipeline from the stator of the generator are formed by hollow conducting wires of the stator coils, so that in order to avoid electric leakage, the cooling water circulating in the circulating pipeline is non-conductive oxygen-free demineralized water. However, in the operation process of the circulating pump, a small amount of air and impurities are inevitably led to enter the circulating pipeline, the anaerobic desalted water contains cations and anions capable of enabling the anaerobic desalted water to conduct electricity, in order to remove the cations and the anions in the anaerobic desalted water, the circulating pipeline is divided into a first pipeline section and a second pipeline section which are connected end to end, the first pipeline section passes through the circulating pump, a generator stator and a cooler, the desalting pipeline is connected with the second pipeline section in parallel, a desalting bed is arranged on the desalting pipeline, the cations and the anions in the anaerobic desalted water are removed through the desalting bed so as to keep the quality of the anaerobic desalted water, wherein the generator stator is close to the water inlet end of the first pipeline section, and the cooler is close to the water outlet end of the first pipeline section.
During maintenance of the nuclear power plant generator stator cooling system, the oxygen-free demineralized water in the nuclear power plant generator stator cooling system needs to be discharged, and after the maintenance is finished, new oxygen-free demineralized water (directly generated by a water oxygen-free production device) needs to be injected. Because circulation pipeline and the demineralized water pipe contain the air, the anaerobic demineralized water that leads to initial injection nuclear power station generator stator cooling system receives carbon dioxide, oxygen and residual metal impurity, leads to system water partial carbonation, the anaerobic demineralized water of this process plays the effect of washing, wherein, after waiting the air in circulation pipeline and the demineralized water pipe to discharge, continue to inject anaerobic demineralized water into nuclear power station generator stator cooling system, replace the anaerobic demineralized water of initial stage, thereby make the anaerobic demineralized water in the nuclear power station generator stator cooling system have better quality. The existing method for flushing and replacing the anaerobic desalted water of the generator stator cooling system needs to inject the anaerobic desalted water from a water inlet of a desalting pipeline so as to improve the quality of the anaerobic desalted water by using a desalting bed, so that the anaerobic desalted water in the flushing and replacing process needs to pass through the desalting bed, a large amount of anaerobic desalted water affected by carbon dioxide consumes H & lt + & gt and OH & lt- & gt groups of cathode and anode resins in the desalting bed, especially the carbon dioxide in water consumes a large amount of OH & lt- & gt groups of cathode resins in a carbonate form, and the purifying capacity of the desalting bed is obviously reduced.
In addition, the desalination bed plays a hindrance effect to the injection of anaerobic demineralized water, reduces the injection efficiency of anaerobic demineralized water, leads to motor stator cooling system anaerobic demineralized water to wash the replacement comparatively consuming time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an anaerobic desalted water flushing and replacing method for a stator cooling system of a nuclear power station generator, aiming at solving the problems that the purification capacity of a desalting bed is obviously reduced and the flushing and replacing are time-consuming.
The invention is realized by the following steps:
an anaerobic demineralized water flushing and replacing method for a nuclear power station generator stator cooling system comprises the following steps:
a first rinsing and replacing stage: closing a water inlet and a water outlet of the desalting pipeline, injecting oxygen-free desalting water into the circulating pipeline through the injection port, and discharging the oxygen-free desalting water through the water outlet so as to carry out oxygen-free desalting water flushing and replacing operation on the circulating pipeline;
a second flushing and replacing stage: and opening a water inlet and a water outlet of the desalting pipeline, continuously injecting oxygen-free desalting water into the circulating pipeline through the injection port, and discharging the oxygen-free desalting water through the water outlet so as to carry out oxygen-free desalting water flushing and replacing operation on the circulating pipeline and the desalting pipeline.
Optionally, in the first flushing displacement phase, the circulation pump is activated after the oxygen-free demineralized water reaches the circulation pump.
Optionally, the injection port is disposed at a water inlet of the circulation pump.
Optionally, the injection port is formed by a flange interface.
Optionally, the drain opening is formed by a flange interface.
The invention also provides a cooling system of the generator stator of the nuclear power station, which comprises a circulating pipeline, a circulating pump, a desalting pipeline and a desalting bed, the circulating pipeline passes through the circulating pump, the generator stator and the cooler, the circulating pipeline is divided into a first pipe section and a second pipe section which are connected end to end, the first pipe section passes through the circulation pump, the generator stator and the cooler and absorbs heat at the generator stator, and heat is exchanged to the cooler at the cooler, the desalination line being connected in parallel with the second pipe section, the desalting bed is arranged on the desalting pipeline, valves are arranged at the water inlet and the water outlet of the desalting pipeline, the circulating pipeline is provided with an injection interface for injecting anaerobic demineralized water and a drainage interface for discharging the anaerobic demineralized water, and the injection interface and the drainage interface are both provided with valves.
Optionally, the injection interface is disposed at a water inlet of the circulation pump.
Optionally, the circulation pump is located between the generator stator and the cooler in the arrangement path of the first pipe section, the injection interface is located between the generator stator and the circulation pump in the arrangement path of the first pipe section, and the drain interface is located between the generator stator and the injection interface in the arrangement path of the first pipe section.
Optionally, the injection interface is a flange interface.
Optionally, the drain opening is a flange interface.
Based on the anaerobic desalted water flushing and replacing method of the invention, firstly, the first flushing and replacing stage does not consume the purifying capacity of the desalting bed, and the second flushing and replacing stage consumes little purifying capacity of the desalting bed, therefore, based on the flushing and replacing method, the method can effectively avoid the remarkable reduction of the purifying capacity of the desalting bed, secondly, the whole flushing and replacing process is divided into two stages for flushing and replacing, in the first flushing and replacing stage, the desalting pipeline is shielded, and the circulating pipeline is only flushed and replaced without any resistance to the anaerobic desalted water by the desalting bed, in the stage, the desalting bed can quickly flush and replace the anaerobic desalted water, then the second flushing and replacing stage is carried out, and the shielding of the desalting pipeline is cancelled, wherein, because the anaerobic desalted water in the circulating pipeline has better quality after passing through the first flushing and replacing stage, only the air in the anaerobic desalting pipeline has influence on the desalting water, and the oxygen-free demineralized water that receives the influence can be being washed and put the operation in-process, and most is directly discharged through the outlet, and this is washed in the replacement stage, after discharging the air in the desalination pipeline, can make the oxygen-free demineralized water in circulating line and the desalination pipeline reach better quality fast, consequently, with whole washing replacement process divide two stages after, has greatly improved and has washed replacement efficiency, reduces and washes the required time of replacement.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of an oxygen-free demineralized water flushing and replacing method for a stator cooling system of a generator in a nuclear power plant, which is provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a stator cooling system of a generator in a nuclear power plant according to an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
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| 110 | |
120 | |
| 200 | Circulating |
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| 300 | |
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| 400 | |
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| 500 | |
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| 600 | |
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| 700 | |
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| 800 | Cooling device |
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, an embodiment of the present invention provides an anaerobic demineralized water flushing and replacing method for a stator cooling system of a nuclear power plant generator, which includes steps of performing flushing and replacing in two stages in a whole flushing and replacing process, shielding a desalination pipeline 300 in a first flushing and replacing stage, performing anaerobic demineralized water flushing and replacing operation only on a circulation pipeline 100, and then performing a second flushing and replacing stage, canceling shielding the desalination pipeline 300, and performing anaerobic demineralized water flushing and replacing operation on the circulation pipeline 100 and the desalination pipeline 300.
It should be noted that, the operation object of the oxygen-free demineralized water flushing and replacing method for the nuclear power plant generator stator cooling system is a nuclear power plant generator stator cooling system, which can be seen from fig. 2, the nuclear power plant generator stator cooling system structurally comprises at least a circulation pipeline 100, a circulation pump 200, a demineralized water pipeline 300 and a desalination bed 400, the circulation pipeline 100 passes through the circulation pump 200, a generator stator 700 and a cooler 800, the circulation pipeline 100 is divided into a first pipe section 110 and a second pipe section 120 which are connected end to end, the first pipe section 110 passes through the circulation pump 200, the generator stator 700 and the cooler 800 and absorbs heat at the generator stator 700, and exchanges heat to the cooler 800 at the cooler 800, the desalination pipeline 300 is connected in parallel with the second pipe section 120, and the desalination bed 400 is arranged at the desalination pipeline 300, wherein, if the structure required by the oxygen-free demineralized water flushing and replacing method for the nuclear power plant generator stator cooling system is not listed therein, it is sufficient to fill the stator cooling system of the generator of the nuclear power plant correspondingly according to the structure required for realizing the operation.
The anaerobic demineralized water flushing and replacing method for the nuclear power station generator stator cooling system comprises the following steps:
a first rinsing and replacing stage: the water inlet and outlet of the desalination line 300 are closed, and oxygen-free desalination water is injected into the circulation line 100 through the injection port, and discharged through the discharge port, so that the circulation line 100 is subjected to oxygen-free desalination water flushing and replacement work.
It is noted here that the oxygen-free demineralized water is produced directly by the oxygen-free production device, which usually leads to a conduit leading to the injection opening.
In the flushing and replacing stage, since the water inlet and the water outlet of the desalination pipeline 300 are closed, the oxygen-free desalination water injected into the circulation pipeline 100 through the injection port can only be flushed and replaced in the circulation pipeline 100, but cannot flow into the desalination pipeline 300, in the process, the air in the circulation pipeline 100 is discharged, and after the air in the circulation pipeline 100 is discharged, the oxygen-free desalination water is continuously injected into the circulation pipeline 100, and the oxygen-free desalination water in the initial stage is replaced, so that the oxygen-free desalination water in the circulation pipeline 100 has better quality, wherein the oxygen-free desalination water does not enter the circulation pipeline 100 through the desalination pipeline 300, namely does not pass through the desalination bed 400, so that the purification capacity of the desalination bed 400 is not consumed, the resistance of the desalination bed 400 to the oxygen-free desalination water is also reduced, and the flushing and replacing operation is rapidly performed.
A second flushing and replacing stage: the water inlet and the water outlet of the desalination line 300 are opened, and the oxygen-free desalination water is continuously injected into the circulation line 100 through the injection port, and the oxygen-free desalination water is discharged through the water outlet, so that the circulation line 100 and the desalination line 300 are subjected to oxygen-free desalination water flushing and replacement.
During the second flushing and replacing stage, since the first flushing and replacing stage is already performed, the anaerobic desalted water in the circulating pipeline 100 has better quality, only the air in the desalting pipeline 300 influences the anaerobic desalted water, and most of the influenced anaerobic desalted water is directly discharged through the water outlet in the flushing and replacing operation process, so that the consumption of the purification capacity of the desalting bed 400 is less, therefore, in the flushing and replacing stage, after the air in the desalting pipeline 300 is discharged, the anaerobic desalted water in the circulating pipeline 100 and the desalting pipeline 300 can quickly reach better quality, and the consumption of the purification capacity of the desalting bed 400 is extremely small.
As can be seen from the above, firstly, the first flushing and replacing stage does not consume the purifying capacity of the desalination bed 400, and the second flushing and replacing stage consumes very little purifying capacity of the desalination bed 400, so that, based on the flushing and replacing method, the substantial reduction of the purifying capacity of the desalination bed 400 can be effectively avoided, thereby ensuring that the quality of the cooling circuit water is kept stable and high-capacity purifying capacity during the daily operation of the unit, secondly, the whole flushing and replacing process is divided into two stages for flushing and replacing, in the first flushing and replacing stage, the desalination pipeline 300 is shielded, and only the anaerobic desalination flushing and replacing operation is performed on the circulating pipeline 100, in this stage, the desalination bed 400 does not generate any resistance to the anaerobic desalination water, so that the flushing and replacing operation can be performed rapidly, then, the second flushing and replacing stage is performed, the shielding of the desalination pipeline 300 is cancelled, wherein, since the first flushing and replacing stage has already passed, the anaerobic desalted water in the circulating pipeline 100 has better quality, only the air in the residual desalted pipeline 300 influences the anaerobic desalted water, most of the influenced anaerobic desalted water is directly discharged through the water outlet in the process of washing and placing operation, and in the washing and replacing stage, after the air in the desalted pipeline 300 is discharged, the anaerobic desalted water in the circulating pipeline 100 and the desalted pipeline 300 can quickly reach better quality, so that the whole washing and replacing process is divided into two stages, the washing and replacing efficiency is greatly improved, and the time required by washing and replacing is reduced.
It should be noted that the desalination bed 400 is preferably a mixed bed, and the water inlet is disposed at the top and the water outlet is disposed at the bottom.
In the present embodiment, the circulation pump 200 is started when the oxygen-free demineralized water reaches the circulation pump 200. The circulation pump 200 is used for accelerating the flow of the anaerobic demineralized water in the stator cooling system of the generator of the nuclear power station, thereby being beneficial to improving the replacement efficiency.
In the embodiment of the present invention, the injection port is disposed at the water inlet of the circulation pump 200. So, can make the oxygen-free demineralized water who pours into circulation pipeline 100 into circulating pump 200 fast to quick start circulating pump 200 improves and washes replacement efficiency.
In an embodiment of the invention, the injection port is formed by a flange joint, so that an external pipeline structure is convenient to be butted with the injection port.
In embodiments of the invention, the drain opening is formed by a flange interface, such that an external pipeline structure is facilitated to interface with the drain opening.
As shown in fig. 2, an embodiment of the present invention provides a cooling system for a generator stator of a nuclear power plant, including a circulation line 100, a circulation pump 200, a desalination line 300, and a desalination bed 400, where the circulation line 100 passes through the circulation pump 200, the generator stator 700, and a cooler 800, the circulation line 100 is divided into a first pipe segment 110 and a second pipe segment 120 connected end to end, the first pipe segment 110 passes through the circulation pump 200, the generator stator 700, and the cooler 800, and absorbs heat in the generator stator 700, the heat is exchanged to the cooler 800 at the cooler 800, the desalination pipeline 300 is connected in parallel with the second pipe section 120, the desalination bed 400 is disposed in the desalination pipeline 300, valves (not shown) are disposed at the water inlet and the water outlet of the desalination pipeline 300, the circulation pipeline 100 is provided with an injection port 500 for injecting oxygen-free desalination water and a drain port 600 for draining the oxygen-free desalination water, and the injection port 500 and the drain port 600 are provided with valves (not shown).
The direction of the hollow arrows in fig. 2 is the flow direction of the oxygen-free demineralized water in the second flushing displacement phase.
The nuclear power station generator stator cooling system can be directly applied to the oxygen-free demineralized water flushing and replacing method of the nuclear power station generator stator cooling system in the embodiment.
Here, the injection port 500 is formed with an injection port, and the drain port 600 is formed with a water outlet.
In the specific use process:
a first rinsing and replacing stage: closing valves at a water inlet and a water outlet of the desalination pipeline 300, injecting oxygen-free desalination water into the circulation pipeline 100 through the injection interface 500, and discharging the oxygen-free desalination water through the drainage interface 600 to perform oxygen-free desalination water flushing and replacement operation on the circulation pipeline 100;
a second flushing and replacing stage: the valves at the water inlet and outlet of the desalination line 300 are opened, and the oxygen-free desalination water is continuously injected into the circulation line 100 through the injection port 500, and is discharged through the drain port 600, so that the circulation line 100 and the desalination line 300 are subjected to oxygen-free desalination water flushing and displacement operation.
Wherein, after the second flushing and replacing stage, the valves at the filling interface 500 and the draining interface 600 are closed.
So, based on this nuclear power station generator stator cooling system, can effectively avoid salt bed 400's purification ability to show to reduce, secondly, greatly improved and washed replacement efficiency, reduce and wash the replacement required time.
In the embodiment of the present invention, the circulation pump 200 is located between the generator stator 700 and the cooler 800 on the arrangement path of the first pipe segment 110, the inlet connector 500 is located between the generator stator 700 and the circulation pump 200 on the arrangement path of the first pipe segment 110, and the drain connector 600 is located between the generator stator 700 and the inlet connector 500 on the arrangement path of the first pipe segment 110, so that only one inlet connector 500 and one drain connector 600 need to be provided, respectively, and the oxygen-free demineralized water enters the circulation pipeline 100 from the inlet connector 500 and flows through substantially the whole circulation pipeline 100 and then directly flows out from the drain connector 600.
In an embodiment of the present invention, the fill interface 500 is a flange interface, which facilitates the interface of an external pipeline structure with the fill interface 500.
In the present embodiment, the drain connector 600 is a flange connector, which facilitates the external pipeline structure to interface with the drain connector 600.
The present invention is not limited to the above preferred embodiments, and any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An anaerobic demineralized water flushing and replacing method for a nuclear power station generator stator cooling system is characterized by comprising the following steps:
a first rinsing and replacing stage: closing a water inlet and a water outlet of the desalting pipeline, injecting oxygen-free desalted water into the circulating pipeline through the injection port, and discharging the oxygen-free desalted water through the water discharge port so as to carry out oxygen-free desalted water flushing and replacing operation on the circulating pipeline;
a second flushing and replacing stage: and opening a water inlet and a water outlet of the desalting pipeline, continuously injecting oxygen-free desalting water into the circulating pipeline through the injection port, and discharging the oxygen-free desalting water through the water outlet so as to carry out oxygen-free desalting water flushing and replacing operation on the circulating pipeline and the desalting pipeline.
2. The method of claim 1, wherein the circulating pump is activated after the oxygen-free demineralized water reaches the circulating pump during the first flushing and displacing stage.
3. The method as claimed in claim 2, wherein the injection port is disposed at the water inlet of the circulation pump.
4. The method of claim 1, wherein the injection port is formed by a flange interface.
5. The method of anaerobic demineralized water flush displacement of a nuclear power plant generator stator cooling system of claim 1, wherein the drain port is formed by a flange interface.
6. A cooling system for a generator stator of a nuclear power station comprises a circulating pipeline, a circulating pump, a desalting pipeline and a desalting bed, the circulating pipeline passes through the circulating pump, the generator stator and the cooler, the circulating pipeline is divided into a first pipe section and a second pipe section which are connected end to end, the first pipe section passes through the circulation pump, the generator stator and the cooler and absorbs heat at the generator stator, and heat is exchanged to the cooler at the cooler, the desalination line is connected in parallel with the second pipe section, the desalination bed is arranged on the desalination line, the system is characterized in that valves are arranged at a water inlet and a water outlet of the desalting pipeline, the circulating pipeline is provided with an injection interface for injecting anaerobic desalting water and a drainage interface for discharging the anaerobic desalting water, and the injection interface and the drainage interface are both provided with valves.
7. The nuclear power plant generator stator cooling system of claim 6, wherein the fill interface is disposed at a water inlet of the circulation pump.
8. The nuclear power plant generator stator cooling system as recited in claim 7 or 7, wherein the circulation pump is located between the generator stator and the cooler in the arrangement path of the first pipe section, the injection interface is located between the generator stator and the circulation pump in the arrangement path of the first pipe section, and the water discharge interface is located between the generator stator and the injection interface in the arrangement path of the first pipe section.
9. The nuclear power plant generator stator cooling system of any one of claims 6 to 8, wherein the injection interface is a flange interface.
10. The nuclear power plant generator stator cooling system of any one of claims 6 to 8, wherein the drain interface is a flange interface.
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| CN202010334689.7A CN111570430B (en) | 2020-04-24 | 2020-04-24 | Nuclear power station generator stator cooling system and anaerobic demineralized water flushing and replacing method thereof |
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| CN111570430B CN111570430B (en) | 2022-04-19 |
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Cited By (1)
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| CN113492144A (en) * | 2021-06-08 | 2021-10-12 | 广东核电合营有限公司 | Nuclear power station drain tank flushing system, method and equipment |
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