Nuclear power station argon centralized supply system

Abstract

The argon centralized supply system for the nuclear power station is used for providing argon for all floor areas of the nuclear power station, floors comprise an overground floor, an underground floor and a ground floor, the system comprises a gas storage assembly, a vaporizer, a pressure reduction assembly and a gas distribution assembly, and the gas storage assembly is used for storing liquid argon; the vaporizer communicates with the gas storage assembly and is used for vaporizing liquid argon; the pressure reduction assemblies are communicated with the vaporizer and used for adjusting the pressure of vaporized argon, and each pressure reduction assembly comprises two parallel pressure reduction loops; the gas distribution assemblies are arranged on all floors and each comprise a main pipe and a plurality of branch pipes, each branch pipe is provided with an independent control valve, and the main pipes are communicated with the pressure reduction assembly. The system can realize safe and efficient gas supply.

Description

Technical Field

[0001] The utility model relates to the field of nuclear power plants, in particular to the field of conventional island argon gas supply solutions. Background Art

[0002] During the construction of nuclear power plants, argon is required for inert gas protection. A nuclear power plant consists of a nuclear island, a conventional island and supporting facilities. The nuclear island includes nuclear equipment and a primary circuit system, and the conventional island refers to steam power generation equipment and systems, including generator buildings, circulating water pump rooms and power transmission and distribution buildings.

[0003] During the construction of a conventional island, the traditional gas supply method is to configure three gas cylinders in front of each floor and area equipment, including one working gas cylinder and two spare gas cylinders to ensure gas supply for the equipment. In order to ensure that air does not enter the gas cylinder, it is generally necessary to replace the gas cylinder with a new one before the gas is used up. When replacing the new gas cylinder, it is necessary to ensure that the gas cylinder retains a certain pressure to ensure the normal operation of the equipment.

[0004] However, the above method has the following disadvantages: the gas supply method of replacing gas cylinders is not conducive to work continuity; the replacement and use of gas cylinders requires the cooperation of multiple people, and frequent replacement wastes both time and manpower; at the same time, gas cylinders are prone to collision during use, replacement and storage; the decentralized gas supply method increases the difficulty of gas cylinder management. Utility Model Content

[0005] One purpose of the utility model is to provide a centralized argon supply system for a conventional island of a nuclear power plant, which can realize safe and efficient gas supply.

[0006] To achieve the above-mentioned purpose, a centralized argon supply system for a nuclear power plant is used to provide argon to each floor area of ​​a nuclear power plant, wherein the floors include above-ground floors, underground floors and ground floors. The system includes a gas storage assembly, a vaporizer, a pressure reducing assembly and a gas distribution assembly. The gas storage assembly is used to store liquid argon; the vaporizer is connected to the gas storage assembly and is used to vaporize the liquid argon; the pressure reducing assembly is connected to the vaporizer and is used to adjust the pressure of the vaporized argon, and the pressure reducing assembly includes multiple parallel pressure reducing circuits; the gas distribution assembly is arranged on each floor, including a main pipe and multiple branch pipes, each branch pipe is provided with an independent control valve, and the main pipe is connected to the pressure reducing assembly.

[0007] In one or more embodiments, the system further includes a protection system, wherein the protection system includes a storage room for placing the gas storage assembly, and the storage room is formed by a plurality of steel plates.

[0008] In one or more embodiments, the gas storage assembly includes multiple Dewar containers, multiple interfaces, a liquid level gauge, a pressure gauge and an indoor gas concentration monitor, the Dewar container is used to store liquid argon, and the interface is used to connect the Dewar container with the vaporizer, including a main interface and a backup interface.

[0009] In one or more embodiments, the pressure reducing assembly includes a pressure reducing valve, a pressure gauge and a ball valve, the ball valve and the pressure reducing valve are arranged on each of the pressure reducing circuits, and the pressure gauge is arranged at the inlet and outlet ends of each of the pressure reducing circuits.

[0010] In one or more embodiments, each branch pipe of the gas distribution assembly is provided with a quick connector and a control valve.

[0011] In one or more embodiments, an anti-misoperation valve and a one-way valve are further provided between the mother pipe and the pressure reducing assembly.

[0012] In one or more embodiments, the protection system and the gas storage assembly are arranged at the ground level.

[0013] In one or more embodiments, the pressure range of the vaporized argon gas output by the decompression component is 0.2 to 0.25 MPa.

[0014] In one or more embodiments, the system includes a control center that is signal-connected to the gas storage assembly, the vaporizer, the pressure-reducing assembly, and the gas distribution assembly.

[0015] The above-mentioned nuclear power plant argon centralized supply system realizes cross-floor and cross-region gas supply. Without the need for multiple people to carry gas cylinders, the centralized gas supply device can flexibly meet the gas demand of each area, which is safe and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0017] Figure 1 It is a schematic diagram of the centralized argon supply system of a nuclear power plant;

[0018] Figure 2 It is a connection diagram of the gas storage assembly, the vaporizer and the pressure reducing assembly;

[0019] Figure 3 is a schematic diagram of the gas distribution assembly.

[0020] Symbols and Markings

[0021] 10 Gas storage components

[0022] 11 Dewar flask container

[0023] 12 Interface

[0024] 20 Vaporizer

[0025] 30 Pressure relief assembly

[0026] 31 Pressure reducing circuit

[0027] 40 Gas distribution assembly

[0028] 41 Mother tube

[0029] 42 Branch pipe

[0030] 43 Independent control valve

[0031] 121 Main interface

[0032] 122 spare interface DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0034] It should be noted that these and other subsequent drawings are only examples and are not drawn in proportion, and should not be used as a limitation on the actual scope of protection required by the present utility model.

[0035] Conventional islands are divided into multiple areas, including above-ground floors, underground floors, and ground floors. For example, there are six areas located below -9.50m, -9.50m, ±0.00m (ground), +9.00m, +20.5m, and the roof. Figure 1 As shown, the pipeline layout involves all floors and areas. The argon gas required for pipeline welding is provided by argon gas cylinders and multiple gas cylinders are reserved to ensure gas supply. In case the gas cylinders are not completely exhausted, they need to be replaced with new ones.

[0036] A nuclear power plant argon centralized supply system for supplying argon to various floor areas of a nuclear power plant can realize gas supply safely and efficiently.

[0037] System Reference Figures 1 to 3 As shown, it includes a gas storage assembly 10 , a vaporizer 20 , a decompression assembly 30 and a gas distribution assembly 40 .

[0038] Specifically, the gas storage assembly 10 is used to store liquid argon gas, and includes multiple Dewar flask containers 11, multiple interfaces 12, a liquid level meter, a pressure gauge and an indoor gas concentration monitor. The Dewar flask container 11 is used to store liquid argon gas, and the interface is used to connect the Dewar flask container with the vaporizer, including a main interface 121 and a spare interface 122.

[0039] Centralized argon supply uses liquid argon from a dewar tank as the gas source, which is converted into gaseous argon after connecting to a vaporizer device, and then delivered to users in various regions through a pressure reducing valve group. In some embodiments, twelve or more spare gas cylinder interfaces are provided in front of the pressure reducing valve group to avoid interruption of gas supply due to failure of the gas supply device. The interfaces can be switched manually to switch the gas cylinders to ensure continuous supply of gas.

[0040] In some embodiments, the system further includes a protection system, which includes a storage room for placing the gas storage assembly, and the storage room is formed by a plurality of steel plates, which is relatively strong and easy to manufacture. When a Dewar flask is used to supply argon, the Dewar flask is placed in a safe area outside the conventional island work area, and the user can stay away from the Dewar flask area, thereby ensuring the safety of gas source storage and the personal safety of the user.

[0041] The protection system and the gas storage assembly 10 are preferably arranged at the ground level at 0 m to facilitate maintenance and monitoring by management personnel.

[0042] The vaporizer 20 is a device that converts liquid argon into gas by absorbing heat through the vaporizer. The vaporizer 20 is connected to the gas storage component and is used to vaporize the liquid argon.

[0043] The decompression assembly 30 is connected to the vaporizer 20 and is used to adjust the pressure of the vaporized argon gas. Preferably, the decompression assembly includes a plurality of parallel decompression circuits 31, such as Figure 2 As shown, it specifically includes two parallel pressure reducing circuits 31 , and also includes a pressure reducing valve, a pressure gauge and a ball valve. The ball valve and the pressure reducing valve are arranged on each pressure reducing circuit 31 , and the pressure gauge is arranged at the inlet and outlet ends of each pressure reducing circuit 31 .

[0044] The initial pressure of the gasified argon is relatively high and cannot be directly provided to users. Therefore, a pressure reducing assembly is provided to adjust the outlet pressure to between 0.2 and 0.25 MPa, which can be directly provided to users. In order to ensure the safety and reliability of the pressure reducing device, pressure gauges are provided before and after the pressure reducing valve group to monitor the pressure of the gas entering and leaving the valve group, and each set of pressure reducing assembly has two pressure reducing circuits 31. When a pressure reducing valve fails, the ball valves before and after the pressure reducing valve on the pressure reducing circuit 31 can be closed, and the pressure reducing valve can be inspected and repaired, and the circuit can be closed without affecting the normal operation of the other circuit.

[0045] The gas distribution assembly 40 is as follows Figure 1 and Figure 3As shown, it is arranged on each floor to form a pipeline network, including a main pipe 41 and a plurality of branch pipes 42. The main pipe 41 is connected to the pressure reducing assembly 30, and each branch pipe 42 is provided with an independent control valve 43.

[0046] In some embodiments, the gas distribution assembly 40 also includes an expansion pipe, a distribution branch pipe, a control valve, a quick connector, an end plug, etc. For example, each distributor has 8 branch pipe connectors, and a total of 50 distributors are arranged, that is, a total of 400 user interfaces, which can be conveniently used in large venues. When the staff needs to use gas, they can unscrew the end plug 44 as needed, connect the standard argon belt with the quick connector, and open the independent control valve 43 for use. The system is distributed in various areas of the conventional island, and users can connect to the distribution system nearby when needed.

[0047] Preferably, an anti-misoperation valve and a one-way valve are also provided between the main pipe and the pressure reducing assembly to prevent the user from being confused when using the distribution system due to unfamiliarity with the distribution system. The anti-misoperation valve can be directly closed to cut off the system to ensure safety.

[0048] In some embodiments, the system includes a control center, which is signal-connected to the gas storage component, vaporizer, pressure reduction component and gas distribution component, and uses the control center for unified deployment to improve unified management of gas cylinders.

[0049] The above supply system has the advantages of safety, economy, convenience and reliability. The centralized gas supply switching system and the two-stage pressure reducing device ensure uninterrupted gas supply and stable pressure. The stainless steel pipe is used to transport gas, which is not only neatly arranged but also firm and not easy to touch, so that the argon flow rate on site is constant, ensuring the quality of on-site argon arc welding; when the welder needs to perform argon arc welding on the conventional island, he only needs to apply to the centralized gas supply system administrator for the gas point valve switch key, which reduces the welding preparation time and the site cleaning time after the construction is completed, and is convenient for welders to use argon gas; building a centralized gas cylinder room can save the construction space of the conventional island, and there is no need to cut off the gas when replacing the Dewar bottle, which saves time and ensures the continuous supply of gas. Using Dewar bottles to store liquid argon not only reduces transportation costs, but also reduces the number of times users transport it back and forth. Compared with ordinary cylinders, it reduces the residual gas volume in the empty cylinder. Using the same gas source can reduce the management cost of the cylinder use accordingly, making the gas source management more unified and standardized while also saving costs. This system is particularly suitable for multi-layer supply sites, and the gas distribution components can be opened on demand by personnel in each area, which is convenient to use.

[0050] In particular, the system can provide an emergency gas source for the centralized gas supply device. When the dewar tanks are exhausted and new dewar tanks have not arrived, the argon cylinder group can be connected to the emergency device to ensure the normal use of the gas collection system.

[0051] Combined with the introduction of the above-mentioned nuclear power plant argon centralized supply system, we can also understand a nuclear power plant argon centralized supply method, including the following steps: storing liquid argon on the ground, and establishing gas distribution components in each floor area; using a vaporizer to vaporize the liquid argon and then transporting it to each gas distribution component; selectively opening the branch pipes of the gas distribution component in different areas to supply argon.

[0052] Specifically, when using it, first turn on the switch of the gas storage system, and the liquid gas will be converted into gaseous argon through the vaporization system. When the gas concentration is abnormal, the matching gas concentration monitoring will sound an alarm. Subsequently, the gas is transported to the distribution system of various floors and areas through the decompression component. The pressure margin monitor remotely observes the pressure gauge values ​​before and after the decompression component through the Internet of Things to determine whether it can be directly provided to users.

[0053] If the pressure gauge value is abnormal, you need to turn off the gas storage component switch and check the problem. When the problem is solved, resume delivery. If the pressure gauge value is normal, open the anti-error operation system and the gas reaches each distribution system.

[0054] Finally, the staff in each room open the end plug of the distribution system as needed, connect the welding gas belt to the distribution system, turn on the operating switch on the distribution system, and use the gas.

[0055] In the storage room where the gas storage components are placed, the remaining amount of liquefied gas in the Dewar tank is judged according to the Dewar tank liquid level gauge, and an early warning is given. When the liquefied gas in the Dewar tank is used up, the Dewar tank container and interface are replaced and restarted.

[0056] The above method optimizes the on-site decentralized gas supply mode, realizes the centralized management of gas sources, keeps away from the construction site, ensures the safety of personnel, saves gas, reduces costs, and can meet the gas needs of users on each floor and in each area of ​​the conventional island.

[0057] It should be noted that the above content uses words such as "first" and "second" to limit components, which is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0058] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0059] Although the utility model is disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope defined by the claims of the utility model.

Claims

1. A centralized argon supply system for a nuclear power plant, used to provide argon to each floor area of ​​a nuclear power plant, the floors including above-ground floors, underground floors and ground floors, characterized in that: The system includes: A gas storage assembly for storing liquid argon; a vaporizer, connected to the gas storage assembly and used for vaporizing the liquid argon; a decompression assembly, connected to the vaporizer and used to adjust the pressure of vaporized argon gas, the decompression assembly comprising a plurality of parallel decompression circuits; and The gas distribution assembly is arranged on each floor, and comprises a main pipe and a plurality of branch pipes. Each branch pipe is provided with an independent control valve. The main pipe is connected with the pressure reducing assembly.

2. The centralized argon supply system for a nuclear power plant according to claim 1, characterized in that: The system also includes a protection system, which includes a storage room for placing the gas storage assembly, and the storage room is formed by a plurality of steel plates.

3. The centralized argon supply system for a nuclear power plant according to claim 1, characterized in that: The gas storage assembly includes multiple Dewar containers, multiple interfaces, a liquid level meter, a pressure gauge and an indoor gas concentration monitor. The Dewar container is used to store liquid argon gas. The interface is used to connect the Dewar container with the vaporizer, including a main interface and a spare interface.

4. The centralized argon supply system for a nuclear power plant according to claim 1, characterized in that: The pressure reducing assembly comprises a pressure reducing valve, a pressure gauge and a ball valve. The ball valve and the pressure reducing valve are arranged on each of the pressure reducing circuits. The pressure gauge is arranged at the inlet and outlet of each of the pressure reducing circuits.

5. The centralized argon supply system for a nuclear power plant according to claim 1, characterized in that: Each branch pipe of the gas distribution assembly is provided with a quick connector and a control valve.

6. The centralized argon supply system for a nuclear power plant according to claim 1, characterized in that: An anti-misoperation valve and a one-way valve are also provided between the main pipe and the pressure reducing assembly.

7. The centralized argon supply system for a nuclear power plant according to claim 2, characterized in that: The protection system and the gas storage assembly are arranged on the ground layer.

8. The centralized argon supply system for a nuclear power plant according to claim 1, characterized in that: The pressure range of the vaporized argon gas output by the decompression component is 0.2-0.25 MPa.

9. The centralized argon supply system for a nuclear power plant according to claim 1, characterized in that: The system comprises a control center which is signal-connected with the gas storage assembly, the vaporizer, the pressure reducing assembly and the gas distribution assembly.

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