CN116293608A - Secondary side cleaning system and method for high-temperature gas cooled reactor steam generator - Google Patents
Secondary side cleaning system and method for high-temperature gas cooled reactor steam generator Download PDFInfo
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- CN116293608A CN116293608A CN202310301058.9A CN202310301058A CN116293608A CN 116293608 A CN116293608 A CN 116293608A CN 202310301058 A CN202310301058 A CN 202310301058A CN 116293608 A CN116293608 A CN 116293608A
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- 238000004140 cleaning Methods 0.000 title claims abstract description 294
- 238000000034 method Methods 0.000 title claims abstract description 37
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- 239000007788 liquid Substances 0.000 claims abstract description 67
- 238000007599 discharging Methods 0.000 claims abstract description 25
- 238000010926 purge Methods 0.000 claims description 13
- 238000013022 venting Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 description 15
- 238000005260 corrosion Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 15
- 239000000047 product Substances 0.000 description 11
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- -1 iron ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004901 spalling Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
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- PPASLZSBLFJQEF-RKJRWTFHSA-M sodium ascorbate Substances [Na+].OC[C@@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RKJRWTFHSA-M 0.000 description 1
- 229960005055 sodium ascorbate Drugs 0.000 description 1
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- 239000013589 supplement Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1823—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines for gas-cooled nuclear reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/483—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers specially adapted for nuclear steam generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/52—Washing-out devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/54—De-sludging or blow-down devices
- F22B37/545—Valves specially adapted therefor
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
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- Sustainable Energy (AREA)
- High Energy & Nuclear Physics (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention provides a cleaning system and a cleaning method for a secondary side of a steam generator of a high-temperature gas cooled reactor, wherein the system comprises the following components: the vacuumizing module is composed of a vacuum pump and a vacuum pump inlet valve; the cleaning circulation loop is composed of a cleaning circulation pump inlet valve, a cleaning circulation pump outlet valve, a cleaning tank outlet valve and a cleaning tank; the discharging module consists of a water drain valve at the bottom of the steam generator, a low-level water tank and a secondary side discharging valve of the high-temperature gas cooled reactor steam generator; the control module is used for controlling the vacuum pump inlet valve, the vacuum pump, the steam generator bottom water drain valve, the high-temperature gas cooled reactor steam generator secondary side vent valve, the cleaning circulating pump inlet valve, the cleaning circulating pump outlet valve and the cleaning box outlet valve respectively, so that the high-temperature gas cooled reactor steam generator is pumped into a vacuum environment through the vacuumizing module in sequence, the high-temperature gas cooled reactor steam generator is cleaned through the cleaning circulating loop in the vacuum environment, and cleaning liquid is emptied through the discharging module after cleaning is completed.
Description
Technical Field
The invention relates to the technical field of application of high-temperature gas cooled reactors of nuclear power stations, in particular to a system and a method for cleaning a secondary side of a steam generator of a high-temperature gas cooled reactor.
Background
The high-temperature gas cooled reactor of the nuclear power station has the advantages of high heat efficiency, deep burnup, high conversion ratio and the like. Based on the structural characteristics of the high-temperature gas cooled reactor steam generator of the nuclear power plant, corrosion products generated by a water supply system in the operation process are brought into the high-temperature gas cooled reactor steam generator and deposited in the secondary side of a heat transfer pipe of the high-temperature gas cooled reactor steam generator, so that the heat transfer performance of the heat transfer pipe is reduced, and even a heat transfer pipe blockage and cracking accident caused by sediment spalling can occur.
Therefore, how to clean the secondary side of the steam generator of the high-temperature gas cooled reactor is a problem to be solved at present.
Disclosure of Invention
The present invention aims to solve the technical problems in the related art to some extent.
Therefore, a first object of the present invention is to provide a secondary side cleaning system for a high temperature gas cooled reactor steam generator capable of completely removing various corrosion products generated during the operation of the high temperature gas cooled reactor steam generator at normal temperature.
The second aim of the invention is to provide a cleaning method based on a secondary side cleaning system of a high-temperature gas cooled reactor steam generator.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a secondary side cleaning system for a steam generator of a high temperature gas cooled reactor, including: the vacuum pump inlet valve is arranged at an inlet of the vacuum pump and is connected with the bottom of the secondary side of the high-temperature gas cooled reactor steam generator through a first pipeline; the cleaning circulation loop comprises a cleaning circulation pump inlet valve, a cleaning circulation pump outlet valve, a cleaning tank outlet valve and a cleaning tank, wherein the bottom of the secondary side of the high-temperature gas-cooled reactor steam generator is sequentially connected with the top of the secondary side of the high-temperature gas-cooled reactor steam generator through the cleaning circulation pump inlet valve, the cleaning circulation pump and the cleaning circulation pump outlet valve, and the cleaning tank is connected with the inlet of the cleaning circulation pump through the cleaning tank outlet valve; the discharging module comprises a steam generator bottom water drain valve, a low-level water tank and a high-temperature gas-cooled reactor steam generator secondary side air drain valve, the steam generator bottom water drain valve is arranged at the bottom of the high-temperature gas-cooled reactor steam generator secondary side, the steam generator bottom water drain valve is connected with the low-level water tank through a second pipeline, and the high-temperature gas-cooled reactor steam generator secondary side air drain valve is arranged at the top of the high-temperature gas-cooled reactor steam generator; the controller is used for controlling the vacuum pump inlet valve, the vacuum pump, the steam generator bottom water drain valve, the high-temperature gas-cooled reactor steam generator secondary side air drain valve, the cleaning circulation pump inlet valve, the cleaning circulation pump outlet valve and the cleaning tank outlet valve respectively, so that the high-temperature gas-cooled reactor steam generator is pumped into a vacuum environment by the vacuumizing module in sequence, the high-temperature gas-cooled reactor steam generator is cleaned by the cleaning circulation loop in the vacuum environment, and cleaning liquid is emptied by the discharging module after cleaning is completed.
According to an embodiment of the invention, a secondary side cleaning system of a high-temperature gas cooled reactor steam generator comprises: the vacuum pump inlet valve is arranged at the inlet of the vacuum pump and is connected with the bottom of the secondary side of the high-temperature gas cooled reactor steam generator through a first pipeline; the cleaning circulation loop comprises a cleaning circulation pump inlet valve, a cleaning circulation pump outlet valve, a cleaning tank outlet valve and a cleaning tank, wherein the bottom of the secondary side of the high-temperature gas cooled reactor steam generator is sequentially connected with the top of the secondary side of the high-temperature gas cooled reactor steam generator through the cleaning circulation pump inlet valve, the cleaning circulation pump and the cleaning circulation pump outlet valve, and the cleaning tank is connected with the inlet of the cleaning circulation pump through the cleaning tank outlet valve; the discharging module comprises a steam generator bottom water drain valve, a low-level water tank and a high-temperature gas cooled reactor steam generator secondary side air drain valve, the steam generator bottom water drain valve is arranged at the bottom of the high-temperature gas cooled reactor steam generator secondary side, the steam generator bottom water drain valve is connected with the low-level water tank through a second pipeline, and the high-temperature gas cooled reactor steam generator secondary side air drain valve is arranged at the top of the high-temperature gas cooled reactor steam generator; the controller is used for controlling the vacuum pump inlet valve, the vacuum pump, the steam generator bottom water drain valve, the high-temperature gas cooled reactor steam generator secondary side vent valve, the cleaning circulation pump inlet valve, the cleaning circulation pump outlet valve and the cleaning tank outlet valve respectively so as to sequentially pump the high-temperature gas cooled reactor steam generator into a vacuum environment through the vacuumizing module, clean the high-temperature gas cooled reactor steam generator in the vacuum environment through the cleaning circulation loop, and empty cleaning liquid through the discharging module after cleaning is completed. Thus, the system can completely remove various corrosion products generated during the operation of the high temperature gas cooled reactor steam generator at normal temperature.
In addition, the secondary side cleaning system of the high-temperature gas cooled reactor steam generator provided by the embodiment of the first aspect of the invention can also have the following additional technical characteristics:
according to one embodiment of the invention, the system further comprises a pressure sensor arranged at the bottom of the secondary side of the high temperature gas cooled reactor steam generator, wherein the pressure sensor is used for detecting the pressure of the bottom of the secondary side of the high temperature gas cooled reactor steam generator.
According to one embodiment of the invention, the vacuumizing module further comprises a high-level buffer water tank inlet valve and a high-level buffer water tank, wherein the vacuum pump inlet valve is connected with the high-level buffer water tank, the high-level buffer water tank inlet valve is arranged on the first pipeline connected between the high-level buffer water tank and the secondary side bottom of the steam generator, and the high-level buffer water tank is used for storing liquid pumped into the first pipeline from the secondary side bottom of the high-temperature gas-cooled reactor steam generator.
According to one embodiment of the invention, the evacuation module further comprises a high-level buffer tank vent valve disposed on top of the high-level buffer tank, the high-level buffer tank vent valve being for venting air in the high-level buffer tank.
According to one embodiment of the invention, the vacuumizing module further comprises a high-level buffer water tank pressure gauge, wherein the high-level buffer water tank pressure gauge is arranged at the top of the high-level buffer water tank and is used for displaying the pressure in the high-level buffer water tank.
According to one embodiment of the invention, the exhaust module further comprises an exhaust pipe outlet water seal arranged at the outlet of the second pipeline, the exhaust pipe outlet water seal is allowed to be adjusted between-5 and-11 m below the bottom of the secondary side of the high-temperature gas-cooled reactor steam generator in vertical height, and the pressure of the bottom of the secondary side of the high-temperature gas-cooled reactor steam generator is automatically maintained between 0 and 6m water column during the cleaning of the high-temperature gas-cooled reactor steam generator under the action of the height difference between the outlet height of the exhaust pipe outlet water seal and the bottom of the secondary side of the high-temperature gas-cooled reactor steam generator.
According to one embodiment of the invention, the discharging module further comprises a U-shaped water seal arranged between the bottom of the secondary side of the high-temperature gas-cooled reactor steam generator and the low-level water tank, wherein the vertical length of the U-shaped water seal is larger than 15m, and the U-shaped water seal is used for generating a pressure difference under the condition that the water seal at the outlet of the discharging pipe is broken so as to continuously form negative pressure.
According to one embodiment of the invention, the purge circulation loop further comprises a purge circulation pump outlet check valve disposed at the purge circulation pump outlet valve outlet.
According to one embodiment of the invention, the control module is further used for injecting desalted water into the high-temperature gas-cooled reactor steam generator through a cleaning circulation loop after the cleaning liquid is emptied by controlling a vacuum pump inlet valve, a vacuum pump, a steam generator bottom water drain valve, a high-temperature gas-cooled reactor steam generator secondary side air drain valve, a cleaning circulation pump inlet valve, a cleaning circulation pump outlet valve and a cleaning tank outlet valve, so as to clean the high-temperature gas-cooled reactor steam generator through the desalted water.
In order to achieve the above object, according to a second aspect of the present invention, there is provided a cleaning method based on a secondary side cleaning system of a steam generator of a high temperature gas cooled reactor, comprising: controlling the vacuumizing module to vacuumize the high-temperature gas-cooled reactor steam generator into a vacuum environment; controlling a cleaning circulation loop in the vacuum environment to clean the high-temperature gas-cooled reactor steam generator; and controlling the discharging module to empty the cleaning liquid after the cleaning is finished.
According to the cleaning method based on the secondary side cleaning system of the high-temperature gas cooled reactor steam generator, the vacuumizing module is controlled to vacuumize the high-temperature gas cooled reactor steam generator, the cleaning circulation loop is controlled to clean the high-temperature gas cooled reactor steam generator in the vacuum environment, and the discharging module is controlled to empty cleaning liquid after cleaning is completed. Thus, the method can completely remove various corrosion products generated during the operation of the high temperature gas cooled reactor steam generator at normal temperature.
In addition, the cleaning method based on the secondary side cleaning system of the high-temperature gas cooled reactor steam generator provided by the embodiment of the second aspect of the invention can also have the following additional technical characteristics:
according to one embodiment of the invention, the method further comprises: and after the cleaning liquid is emptied, controlling a cleaning circulation loop to inject desalted water into the high-temperature gas-cooled reactor steam generator so as to clean the high-temperature gas-cooled reactor steam generator through the desalted water.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a high temperature gas cooled reactor steam generator secondary side cleaning system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a high temperature gas cooled reactor steam generator secondary side cleaning system according to one embodiment of the invention;
fig. 3 is a schematic diagram of a cleaning method based on a secondary side cleaning system of a high temperature gas cooled reactor steam generator according to an embodiment of the invention.
As shown in the figure: 1. the high temperature gas cooled reactor steam generator, 2, a pressure sensor at the bottom of the secondary side of the high temperature gas cooled reactor steam generator, 3, a cleaning circulating pump inlet valve, 4, a cleaning circulating pump, 5, a cleaning circulating pump outlet valve, 6, a cleaning circulating pump outlet check valve, 7, a cleaning tank outlet valve, 8, a cleaning tank, 9, a liquid level meter at the secondary side of the high temperature gas cooled reactor steam generator, 10, a high-level buffer water tank inlet valve, 11, a high-level buffer water tank, 12, a high-level buffer water tank liquid level meter, 13, a vacuum pump inlet valve, 14, a vacuum pump, 15, a high-level buffer water tank pressure gauge, 16, a high-level buffer water tank emptying valve, 17, a negative pressure system pressure controller, 18, a U-shaped water seal, 19, a steam generator bottom water drain valve, 20, a low-level water tank, 21, a drain pipe outlet water seal, 22 and a high-temperature gas cooled reactor steam generator secondary side emptying valve.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a secondary side cleaning system and a cleaning method for a steam generator of a high temperature gas cooled reactor according to an embodiment of the present invention with reference to the accompanying drawings.
The high-temperature gas cooled reactor of the nuclear power station has the advantages of high heat efficiency, deep burnup, high conversion ratio and the like. Based on the structural characteristics of the high-temperature gas cooled reactor steam generator of the nuclear power plant, corrosion products generated by a water supply system in the operation process are brought into the high-temperature gas cooled reactor steam generator and deposited in the secondary side of a heat transfer pipe of the high-temperature gas cooled reactor steam generator, so that the heat transfer performance of the heat transfer pipe is reduced, and even a heat transfer pipe blockage and cracking accident caused by sediment spalling can occur. The running condition and working condition of the nuclear power steam generator of the high-temperature gas cooled reactor are greatly different from those of the pressurized water reactor steam generator (the pressurized water reactor secondary loop medium walks the shell and the high-temperature gas cooled reactor secondary loop medium walks the pipe side), and the nuclear power steam generator is similar to a thermal power direct current furnace. According to the operation experience of the domestic and foreign thermal power direct current furnace, corrosion products generated by a water supply system in the operation process are deposited on the inner surfaces of the coal economizer and the water cooling wall, and the deposition rate can reach 50g/m 2 The heat transfer efficiency of the heat exchange tube is greatly reduced, the tube explosion accident caused by the heat transfer efficiency is frequently generated, and the cleaning process of the high-temperature gas cooled reactor steam generator needs to be developed safely and efficiently in order to ensure the running efficiency and the safety of the unit to be cleaned every 3-4 years on average.
The heat exchange tube of the high-temperature gas cooled reactor steam generator adopts austenitic stainless steel, and the sensitized austenitic stainless steel can generate pitting corrosion and intergranular corrosion in acid cleaning liquid after being sensitized under the working condition of high temperature for a long time, thereby causing the damage of the heat exchange tube.
The conventional cleaning adopts a positive pressure operation mode, namely the pressure in the cleaning system is greater than the atmospheric pressure, if the process is adopted for cleaning, after the heat exchange tube is damaged, the primary side is in a normal pressure state because the primary side belongs to a non-working condition during the cleaning period, and if the acid cleaning liquid enters the primary side from the secondary side of the steam generator, the primary side is polluted, primary side equipment is severely corroded, and serious nuclear safety accidents are caused.
Therefore, the invention provides a high-temperature gas cooled reactor steam generator secondary side negative pressure cleaning system, the cleaned high-temperature gas cooled reactor secondary side is always in a negative pressure state in the cleaning process, namely the working pressure of a cleaning medium is smaller than atmospheric pressure, and the purpose of removing sediment is achieved by utilizing the complexation of the cleaning medium in a low-temperature negative pressure state. And even if the heat exchange tube leaks in the cleaning process, the cleaning medium can not leak from the secondary side of the high-temperature gas-cooled reactor steam generator to the primary side of the high-temperature gas-cooled reactor steam generator, so that the safety of equipment on the primary side of the high-temperature gas-cooled reactor steam generator is ensured, the system is easy to operate, the achieved cleaning effect is good, and the service life of the high-temperature gas-cooled reactor steam generator can be greatly prolonged.
Fig. 1 is a schematic diagram of a secondary side cleaning system of a high temperature gas cooled reactor steam generator according to an embodiment of the invention.
As shown in fig. 1, a secondary side cleaning system of a high temperature gas cooled reactor steam generator according to an embodiment of the present invention includes: the device comprises a vacuumizing module, a cleaning circulation loop, a discharging module and a control module.
The vacuumizing module comprises a vacuum pump 14 and a vacuum pump inlet valve 13, wherein the vacuum pump inlet valve 13 is arranged at an inlet of the vacuum pump 14, and the vacuum pump inlet valve 13 is connected with the bottom of the secondary side of the high-temperature gas cooled reactor steam generator through a first pipeline.
The cleaning circulation loop comprises a cleaning circulation pump inlet valve 3, a cleaning circulation pump 4, a cleaning circulation pump outlet valve 5, a cleaning tank outlet valve 7 and a cleaning tank 8, wherein the bottom of the secondary side of the high-temperature gas cooled reactor steam generator sequentially passes through the cleaning circulation pump inlet valve 3, the cleaning circulation pump 4 and the cleaning circulation pump outlet valve 5 to be connected with the top of the secondary side of the high-temperature gas cooled reactor steam generator, and the cleaning tank 8 is connected with the inlet of the cleaning circulation pump 4 through the cleaning tank outlet valve 7.
The discharging module comprises a steam generator bottom water drain valve 19, a low-level water tank 20 and a high-temperature gas cooled reactor steam generator secondary side discharging valve 22, wherein the steam generator bottom water drain valve 19 is arranged at the bottom of the high-temperature gas cooled reactor steam generator secondary side, the steam generator bottom water drain valve 19 is connected with the low-level water tank 20 through a second pipeline, and the high-temperature gas cooled reactor steam generator secondary side discharging valve 22 is arranged at the top of the steam generator.
The controller is used for controlling the vacuum pump inlet valve 13, the vacuum pump 14, the steam generator bottom water drain valve 19, the high-temperature gas cooled reactor steam generator secondary side emptying valve 22, the cleaning circulation pump inlet valve 3, the cleaning circulation pump 4, the cleaning circulation pump outlet valve 5 and the cleaning tank outlet valve 7 respectively so as to sequentially pump the high-temperature gas cooled reactor steam generator 1 into a vacuum environment through the vacuumizing module, clean the high-temperature gas cooled reactor steam generator in the vacuum environment through the cleaning circulation loop, and empty cleaning liquid through the discharging module after cleaning is completed.
It should be noted that, because the negative pressure adopted in the invention means that when the real pressure in the equipment or somewhere is smaller than the atmospheric pressure, the pressure measured by the instrument is called vacuum degree or negative pressure, 1 standard atmospheric pressure is equal to 10.339m water column pressure for cleaning, the boiling point of the cleaning liquid is lower, and the cleaning liquid cannot be carried out at higher temperature such as more than 70 ℃ by adopting a conventional cleaning mode, the special cleaning liquid formula is developed, and the cleaning liquid has good cleaning effect on corrosion products at normal temperature. The cleaning liquid comprises the following raw materials in percentage by mass: 6-8% of citric acid, 2-3% of EDTA, 0.5% of corrosion inhibitor and 0.2% of sodium ascorbate, and adjusting the pH value of the cleaning liquid to be between 4 and 5 by ammonia water.
Specifically, the control module firstly closes the outlet valve 7 of the cleaning box, the water drain valve 19 at the bottom of the steam generator and the secondary side vent valve 22 of the high-temperature gas-cooled reactor steam generator, opens the inlet valve 13 of the vacuum pump, and starts the vacuum pump 14 to perform vacuumizing operation on the whole cleaning system until the absolute pressure of the pressure at the bottom of the secondary side of the high-temperature gas-cooled reactor steam generator is less than 1m water column. Then, the purge tank outlet valve 7 is opened to suck the configured cleaning liquid into the cleaning system through the negative pressure, and the cleaning liquid suction device vacuum pump 14 maintains operation, maintaining the system negative pressure until the liquid level of the high-level buffer tank 11 is higher than the top of the high-temperature gas cooled reactor steam generator 1. Finally, when the liquid level meets the requirement, the water drain valve 19 at the bottom of the steam generator is opened, the vacuum pump inlet valve 13 is closed, the operation of the vacuum pump 14 is stopped, the cleaning circulation pump 4 is started to clean, the cleaning circulation pump 4 does work during cleaning, the temperature of the cleaning liquid is reduced and rises, the volume of the cleaning liquid expands, the expanded cleaning liquid is continuously discharged through the second pipeline, and when the heat emitted to the outside of the system by the cleaning system is larger than the heat generated by the working of the cleaning circulation pump, the volume of the cleaning liquid contracts, and at the moment, the outlet valve 7 of the cleaning tank is opened to supplement the cleaning liquid into the cleaning system. And after the cleaning is finished, the cleaning circulation pump 4 is closed, the secondary side vent valve 22 of the high-temperature gas cooled reactor steam generator is opened, and the cleaning liquid is emptied. Thus, the system can completely remove various corrosion products generated during the operation of the high temperature gas cooled reactor steam generator at normal temperature.
FIG. 2 is a schematic diagram of a high temperature gas cooled reactor steam generator secondary side cleaning system according to one embodiment of the invention.
As shown in fig. 2, the system further comprises a pressure sensor arranged at the bottom of the secondary side of the high-temperature gas-cooled reactor steam generator, wherein the pressure sensor is used for detecting the pressure of the bottom of the secondary side of the high-temperature gas-cooled reactor steam generator.
As shown in fig. 2, the vacuumizing module further comprises a high-level buffer water tank inlet valve 10 and a high-level buffer water tank 11, wherein the vacuum pump inlet valve 13 is connected with the high-level buffer water tank 11, the high-level buffer water tank inlet valve 10 is arranged on a first pipeline connected between the high-level buffer water tank 11 and the bottom of the secondary side of the steam generator 1, and the high-level buffer water tank is used for storing liquid pumped into the first pipeline from the bottom of the secondary side of the steam generator of the high-temperature gas cooled reactor. The vacuum pump is particularly used for preventing the vacuum pump 14 from being damaged when liquid enters the high-level buffer water tank 11 from the cleaning system to ensure the safety of the vacuum pump 14 if the liquid enters the vacuumizing module from the cleaning system during the vacuum establishment.
As shown in fig. 2, the vacuum module further includes a high-level buffer tank vent valve 16, the high-level buffer tank vent valve 16 being disposed on top of the high-level buffer tank 11, the high-level buffer tank vent valve 16 being for venting air in the high-level buffer tank.
As shown in fig. 2, the vacuum module further includes a high-level buffer tank pressure gauge 15, the high-level buffer tank pressure gauge 15 is disposed on top of the high-level buffer tank 11, and the high-level buffer tank pressure gauge 15 is used for displaying the pressure in the high-level buffer tank 11.
As shown in fig. 2, the exhaust module further includes an exhaust pipe outlet water seal 21 disposed at the outlet of the second pipeline, the exhaust pipe outlet water seal 21 is allowed to be adjusted between-5 to-11 m below the vertical height of the secondary side bottom of the high temperature gas cooled reactor steam generator, and under the effect of the difference in height between the outlet height of the exhaust pipe outlet water seal 21 and the height of the secondary side bottom of the high temperature gas cooled reactor steam generator, the pressure of the secondary side bottom of the high temperature gas cooled reactor steam generator is automatically maintained between 0 to 6m water column during cleaning of the high temperature gas cooled reactor steam generator, thereby ensuring that the pressure of the secondary side of the high temperature gas cooled reactor steam generator is less than atmospheric pressure during cleaning, and the primary side of the high temperature gas cooled reactor steam generator is maintained at a negative pressure state, while the primary side of the high temperature gas cooled reactor steam generator is maintained at a normal atmospheric pressure during cleaning, even if the heat exchange pipe of the steam generator leaks, the cleaning liquid does not leak from the secondary side to the primary side, thereby ensuring the safety of the nuclear island of the high temperature gas cooled reactor.
As shown in fig. 2, the discharge module further comprises a U-shaped water seal 18 arranged between the bottom of the secondary side of the high-temperature gas cooled reactor steam generator and the low-level water tank 20, and the vertical length of the U-shaped water seal is greater than 15m, when the water seal 21 at the outlet of the discharge pipe is damaged due to accidents, air can only enter the outlet section of the U-shaped water seal 18, the differential pressure of the U-shaped water seal 18 is generated, negative pressure is continuously formed, the air is prevented from entering the inlet of the cleaning pump, and the damage to the cleaning circulation loop is avoided.
As shown in fig. 2, the cleaning circulation loop further comprises a cleaning circulation pump outlet check valve 6 arranged at the outlet of the cleaning circulation pump outlet valve 5, for preventing liquid from flowing back into the cleaning circulation pump 4, so as to realize protection of the cleaning circulation pump.
In one embodiment of the invention, the control module is further used for injecting desalted water into the high temperature gas cooled reactor steam generator through the cleaning circulation loop after the cleaning liquid is emptied by controlling the vacuum pump inlet valve 13, the vacuum pump 14, the steam generator bottom water drain valve 19, the high temperature gas cooled reactor steam generator secondary side air drain valve 22, the cleaning circulation pump inlet valve 3, the cleaning circulation pump 4, the cleaning circulation pump outlet valve 5 and the cleaning tank outlet valve 7.
The cleaning method of the present invention will be described with reference to the system shown in fig. 2, including:
step one: vacuum is applied before cleaning.
And closing the outlet valve 7 of the cleaning tank, the water drain valve 19 at the bottom of the steam generator and the air drain valve 22 at the secondary side of the steam generator of the high-temperature gas-cooled reactor, opening the inlet valve 10 of the high-level buffer water tank and the inlet valve 13 of the vacuum pump, and starting the vacuum pump 14 to perform vacuumizing operation on the whole cleaning system until the absolute pressure value of the pressure sensor 2 at the secondary side of the steam generator of the high-temperature gas-cooled reactor is less than 1m water column.
Step two: injecting cleaning liquid.
Opening the outlet valve 7 of the cleaning tank to suck the configured cleaning liquid into the cleaning system through negative pressure, maintaining the operation of the vacuum pump 14 of the cleaning liquid sucking device, maintaining the negative pressure of the system, observing the liquid level of the liquid level meter 12 of the high-level buffer water tank until the liquid level of the high-level buffer water tank 11 is higher than the top of the high-temperature gas-cooled reactor steam generator 1;
when the liquid level meets the requirement, a water drain valve 19 at the bottom of the steam generator is opened, after water is reserved at an outlet water seal 21 of a discharge pipe, an inlet valve 10 of a high-level buffer water tank is closed, the operation of a vacuum pump 14 is stopped, the height of the outlet water seal 21 of the discharge pipe is adjusted to be between-5 and-11 m at the bottom of the secondary side of the steam generator of the high-temperature gas cooled reactor, an outlet valve 7 of a cleaning tank is closed, and the absolute pressure value of the pressure value at the bottom of the secondary side of the steam generator of the high-temperature gas cooled reactor is automatically maintained between 0 and 6m water column under the action of the difference between the outlet height of the outlet water seal 21 and the height of the bottom of the secondary side of the steam generator of the high-temperature gas cooled reactor.
Step three: and (5) circularly cleaning.
Starting the cleaning circulation pump 4 to perform cleaning, wherein the cleaning circulation pump 4 does work during the cleaning period, the temperature of the cleaning liquid is reduced, the volume of the cleaning liquid is expanded, the expanded cleaning liquid is continuously discharged through the outlet water seal 21 of the discharge pipe, and the pressure of the system is maintained to be stable; when the heat emitted by the cleaning system to the outside of the system is larger than the heat generated by the work of the cleaning circulating pump, the volume of the cleaning liquid can shrink, at the moment, the outlet valve 7 of the cleaning box is opened, the cleaning liquid is supplemented into the cleaning system, and the liquid level of the water seal 21 at the outlet of the whole discharge pipe is maintained.
The pressure value of the pressure sensor 2 at the bottom of the secondary side of the high-temperature gas cooled reactor steam generator is observed at any time during cleaning, and when negative pressure is damaged due to leakage of a heat exchange tube of the steam generator, the pressure controller 17 of the negative pressure system sends out an instruction to close the cleaning circulating pump inlet valve 3, the cleaning circulating pump 4 and the cleaning circulating pump outlet valve 5 so as to ensure the safety of the cleaning circulating pump. And then opening a secondary side emptying valve 22 of the high-temperature gas cooled reactor steam generator, emptying all cleaning liquid through a discharge pipeline, terminating the cleaning process, and cleaning after the steam generator is completely eliminated.
Monitoring various indexes of the cleaning liquid in the cleaning process, and carrying out online monitoring on the corrosion rate in the cleaning process; and (3) analyzing and testing the concentration, acidity and pH value of the iron ions in the cleaning liquid, and ending the cleaning after the concentration and acidity of the iron ions in the cleaning liquid remain stable and do not change.
Step four: discharging the cleaning liquid.
And after the cleaning is finished, the cleaning circulation pump 4 is closed, the secondary side emptying valve 22 of the high-temperature gas cooled reactor steam generator is opened, and cleaning fluid of the cleaning system is emptied.
Step five: injecting desalted water
After the discharge is finished, closing a secondary side blow valve 22 of the high-temperature gas cooled reactor steam generator, closing a water drain valve 19 at the bottom of the steam generator, injecting desalted water into the cleaning tank, opening an inlet valve 10 of a high-level buffer water tank, an inlet valve 13 of a vacuum pump, and starting the vacuum pump 14 to perform vacuumizing operation on the whole cleaning system until the pressure value of a pressure sensor 2 at the secondary side bottom of the high-temperature gas cooled reactor steam generator is less than 1m water column (absolute pressure value;
the outlet valve 7 of the washing tank is opened to suck desalted water into the washing system through negative pressure, the washing system is washed, the vacuum pump 14 keeps running during the suction of the desalted water, the negative pressure of the system is maintained, and the liquid level of the high-level buffer water tank liquid level meter 12 is observed until the liquid level is higher than the top of the high-temperature gas-cooled reactor steam generator 1.
Step six: and (5) circularly flushing.
Starting a cleaning circulation pump 4 to perform circulation flushing, opening a water drain valve 19 at the bottom of the steam generator to continuously flush, continuously injecting desalted water into a cleaning box 8 during flushing, sucking the desalted water into a cleaning system through negative pressure, discharging the desalted water through a water seal 21 at an outlet of a discharge pipe under the action of a height difference after the desalted water enters the system for circulation, adjusting the height of the water seal 21 at the outlet of the discharge pipe to be lower than the bottom of the secondary side of the steam generator of the high-temperature gas cooled reactor by-5 to-11 m in vertical height, and automatically maintaining the absolute pressure of the bottom of the secondary side of the steam generator of the high-temperature gas cooled reactor to be between 0 and 6m water column;
monitoring the pH index of the cleaning liquid in the flushing process, and ending the cyclic flushing when the pH is more than 6;
step seven: and (5) evacuating the flushing liquid.
After the flushing is finished, the cleaning circulation pump 4 is closed, the outlet valve 7 of the cleaning tank is closed, the secondary side emptying valve 22 of the steam generator of the high-temperature gas cooled reactor is opened, flushing fluid and desalted water of the cleaning system are emptied, and the flushing is finished.
The invention aims to provide a negative pressure cleaning system and a negative pressure cleaning method for a secondary side of a high-temperature gas-cooled reactor steam generator, wherein the secondary side of the cleaned high-temperature gas-cooled reactor steam generator is always in a negative pressure state in the cleaning process, the working pressure of a cleaning medium is smaller than the atmospheric pressure, even if a heat exchange tube leaks in the cleaning process, the cleaning medium cannot leak from the secondary side of the high-temperature gas-cooled reactor steam generator to a primary side of the high-temperature gas-cooled reactor steam generator, air leaks from the primary side to the secondary side, the vacuum state of the cleaning system is destroyed, and cleaning liquid automatically flows out of the cleaning system, so that the safety of equipment on the primary side of the high-temperature gas-cooled reactor steam generator is ensured.
The equipment is ensured, and meanwhile, normal-temperature cleaning is adopted, so that various corrosion products generated during the operation of the high-temperature gas cooled reactor steam generator can be completely removed at normal temperature.
In summary, according to an embodiment of the present invention, a secondary side cleaning system for a steam generator of a high temperature gas cooled reactor includes: the vacuum pump inlet valve is arranged at the inlet of the vacuum pump and is connected with the bottom of the secondary side of the high-temperature gas cooled reactor steam generator through a first pipeline; the cleaning circulation loop comprises a cleaning circulation pump inlet valve, a cleaning circulation pump outlet valve, a cleaning tank outlet valve and a cleaning tank, wherein the bottom of the secondary side of the high-temperature gas cooled reactor steam generator is sequentially connected with the top of the secondary side of the high-temperature gas cooled reactor steam generator through the cleaning circulation pump inlet valve, the cleaning circulation pump and the cleaning circulation pump outlet valve, and the cleaning tank is connected with the inlet of the cleaning circulation pump through the cleaning tank outlet valve; the discharging module comprises a steam generator bottom water drain valve, a low-level water tank and a high-temperature gas cooled reactor steam generator secondary side air drain valve, the steam generator bottom water drain valve is arranged at the bottom of the high-temperature gas cooled reactor steam generator secondary side, the steam generator bottom water drain valve is connected with the low-level water tank through a second pipeline, and the high-temperature gas cooled reactor steam generator secondary side air drain valve is arranged at the top of the steam generator; the controller is used for controlling the vacuum pump inlet valve, the vacuum pump, the steam generator bottom water drain valve, the high-temperature gas cooled reactor steam generator secondary side vent valve, the cleaning circulation pump inlet valve, the cleaning circulation pump outlet valve and the cleaning tank outlet valve respectively so as to sequentially pump the high-temperature gas cooled reactor steam generator into a vacuum environment through the vacuumizing module, clean the high-temperature gas cooled reactor steam generator in the vacuum environment through the cleaning circulation loop, and empty cleaning liquid through the discharging module after cleaning is completed. Thus, the system can completely remove various corrosion products generated during the operation of the high temperature gas cooled reactor steam generator at normal temperature.
Fig. 3 is a schematic diagram of a cleaning method based on a secondary side cleaning system of a high temperature gas cooled reactor steam generator according to an embodiment of the invention.
As shown in fig. 3, a cleaning method based on a secondary side cleaning system of a high-temperature gas cooled reactor steam generator according to an embodiment of the invention includes:
s301, controlling the vacuumizing module to vacuumize the high-temperature gas cooled reactor steam generator.
S302, controlling a cleaning circulation loop to clean the high-temperature gas cooled reactor steam generator in a vacuum environment.
S303, controlling the discharging module to empty the cleaning liquid after the cleaning is completed.
According to one embodiment of the invention, the method further comprises: after the cleaning liquid is emptied, the cleaning circulation loop is controlled to inject desalted water into the high-temperature gas-cooled reactor steam generator so as to clean the high-temperature gas-cooled reactor steam generator through the desalted water.
It should be noted that details are not disclosed in the cleaning method based on the secondary side cleaning system of the high-temperature gas cooled reactor steam generator in the embodiment of the present invention, please refer to details disclosed in the secondary side cleaning system of the high-temperature gas cooled reactor steam generator in the embodiment of the present invention, and detailed descriptions thereof are omitted herein.
According to the cleaning method based on the secondary side cleaning system of the high-temperature gas cooled reactor steam generator, the vacuumizing module is controlled to vacuumize the high-temperature gas cooled reactor steam generator, the cleaning circulation loop is controlled to clean the high-temperature gas cooled reactor steam generator in the vacuum environment, and the discharging module is controlled to empty cleaning liquid after cleaning is completed. Thus, the method can completely remove various corrosion products generated during the operation of the high temperature gas cooled reactor steam generator at normal temperature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
Claims (10)
1. A high temperature gas cooled reactor steam generator secondary side cleaning system, comprising:
the vacuum pump inlet valve is arranged at an inlet of the vacuum pump and is connected with the bottom of the secondary side of the high-temperature gas cooled reactor steam generator through a first pipeline;
the cleaning circulation loop comprises a cleaning circulation pump inlet valve, a cleaning circulation pump outlet valve, a cleaning tank outlet valve and a cleaning tank, wherein the bottom of the secondary side of the high-temperature gas-cooled reactor steam generator is sequentially connected with the top of the secondary side of the high-temperature gas-cooled reactor steam generator through the cleaning circulation pump inlet valve, the cleaning circulation pump and the cleaning circulation pump outlet valve, and the cleaning tank is connected with the inlet of the cleaning circulation pump through the cleaning tank outlet valve;
the discharging module comprises a steam generator bottom water drain valve, a low-level water tank and a high-temperature gas-cooled reactor steam generator secondary side air drain valve, the steam generator bottom water drain valve is arranged at the bottom of the high-temperature gas-cooled reactor steam generator secondary side, the steam generator bottom water drain valve is connected with the low-level water tank through a second pipeline, and the high-temperature gas-cooled reactor steam generator secondary side air drain valve is arranged at the top of the high-temperature gas-cooled reactor steam generator;
the controller is used for controlling the vacuum pump inlet valve, the vacuum pump, the steam generator bottom water drain valve, the high-temperature gas-cooled reactor steam generator secondary side air drain valve, the cleaning circulation pump inlet valve, the cleaning circulation pump outlet valve and the cleaning tank outlet valve respectively, so that the high-temperature gas-cooled reactor steam generator is pumped into a vacuum environment by the vacuumizing module in sequence, the high-temperature gas-cooled reactor steam generator is cleaned by the cleaning circulation loop in the vacuum environment, and cleaning liquid is emptied by the discharging module after cleaning is completed.
2. The system of claim 1, further comprising a pressure sensor disposed at a bottom of the secondary side of the high temperature gas cooled reactor steam generator, the pressure sensor configured to detect a pressure at the bottom of the secondary side of the high temperature gas cooled reactor steam generator.
3. The system of claim 1, wherein the evacuation module further comprises a high-level buffer tank inlet valve and a high-level buffer tank, the vacuum pump inlet valve being connected to the high-level buffer tank, the high-level buffer tank inlet valve being disposed on the first line connected between the high-level buffer tank and the steam generator secondary side bottom, the high-level buffer tank for storing liquid pumped into the first line from the high-temperature gas cooled reactor steam generator secondary side bottom.
4. The system of claim 1, wherein the evacuation module further comprises a high-level buffer tank vent valve disposed on top of the high-level buffer tank, the high-level buffer tank vent valve for venting air in the high-level buffer tank.
5. The system of claim 1, wherein the evacuation module further comprises a high-level buffer tank pressure gauge disposed on top of the high-level buffer tank, the high-level buffer tank pressure gauge for displaying the pressure within the high-level buffer tank.
6. The system of claim 1, wherein the drain module further comprises a drain outlet water seal disposed at the second pipe outlet, the drain outlet water seal allowing for adjustment between-5 to-11 m below the vertical height of the secondary side bottom of the high temperature gas cooled reactor steam generator, the pressure at the secondary side bottom of the high temperature gas cooled reactor steam generator being automatically maintained between 0 to 6m water column during cleaning of the high temperature gas cooled reactor steam generator by a difference in height between the drain outlet water seal outlet height and the secondary side bottom of the high temperature gas cooled reactor steam generator.
7. The system of claim 1, wherein the discharge module further comprises a U-shaped water seal disposed between the secondary side bottom of the high temperature gas cooled reactor steam generator and the low level water tank, and wherein the U-shaped water seal has a vertical length greater than 15m, the U-shaped water seal being configured to create a pressure differential in the event of a disruption of the discharge pipe outlet water seal to create a negative pressure.
8. The system of claim 1, wherein the purge circulation loop further comprises a purge circulation pump outlet check valve disposed at a purge circulation pump outlet valve outlet.
9. The system of claim 1, wherein the control module is further configured to inject demineralized water into the high temperature gas cooled reactor steam generator through a purge circulation loop after the purging liquid is emptied by controlling a vacuum pump inlet valve, a vacuum pump, a steam generator bottom drain valve, a high temperature gas cooled reactor steam generator secondary side drain valve, a purge circulation pump inlet valve, a purge circulation pump outlet valve, and a purge tank outlet valve to purge the high temperature gas cooled reactor steam generator through the demineralized water.
10. A cleaning method based on the secondary side cleaning system of the high temperature gas cooled reactor steam generator according to any one of claims 1 to 9, comprising:
controlling the vacuumizing module to vacuumize the high-temperature gas-cooled reactor steam generator into a vacuum environment;
controlling a cleaning circulation loop in the vacuum environment to clean the high-temperature gas-cooled reactor steam generator;
and controlling the discharging module to empty the cleaning liquid after the cleaning is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310301058.9A CN116293608A (en) | 2023-03-23 | 2023-03-23 | Secondary side cleaning system and method for high-temperature gas cooled reactor steam generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310301058.9A CN116293608A (en) | 2023-03-23 | 2023-03-23 | Secondary side cleaning system and method for high-temperature gas cooled reactor steam generator |
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| CN116293608A true CN116293608A (en) | 2023-06-23 |
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| CN202310301058.9A Pending CN116293608A (en) | 2023-03-23 | 2023-03-23 | Secondary side cleaning system and method for high-temperature gas cooled reactor steam generator |
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| Country | Link |
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| CN (1) | CN116293608A (en) |
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2023
- 2023-03-23 CN CN202310301058.9A patent/CN116293608A/en active Pending
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