Compressed air supply system for multi-reactor nuclear power plants

Abstract

The present invention discloses a compressed air supply system suitable for a multi-reactor nuclear power plant, comprising at most two compressed air stations connected to N nuclear power units via a gas transmission pipeline network. Each compressed air station comprises four main air compressors connected in parallel and four dryers connected to the four main air compressors, and the four dryers are arranged in parallel. The system reasonably reduces equipment configuration and cost while satisfying the reliability requirements of downstream users for the compressed air supply system.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power technology, and in particular to a compressed air supply system suitable for a multi-reactor nuclear power plant. Background Art

[0002] During operation or maintenance of nuclear power plant nuclear and conventional island systems, compressed air is required for pneumatic valves and instruments, while public compressed air is required for pneumatic tools and process purges. The demand for compressed air is continuous, but also experiences periodic or sudden fluctuations. Peak public compressed air demand typically occurs during unit maintenance. A drop in instrument air pressure or insufficient supply can affect the proper functioning of pneumatic valves and, consequently, the normal operation of the nuclear power plant. Therefore, high reliability is crucial, and system design prioritizes ensuring the supply of instrument air.

[0003] like Figure 1 As shown in the figure, one of the current solutions for compressed air supply systems in nuclear power plants is to use a dual-unit main air compressor station for compressed air production, equipped with three compressors and a dryer. A wet tank and a dry tank are placed before and after the dryers. During normal operation and during maintenance, one or two compressor units operate, while the other remains in standby. Cooling water for the compressor units is drawn from Units 1 and 2, respectively, via a main pipe, serving as a backup for each other. Power is supplied from the busbars of Units 1 and 2, with two compressor units connected to the Unit 1 busbar and one compressor unit connected to the Unit 2 busbar. The air quality from the main air compressor station meets public compressed air requirements and is directly connected to the public compressed air distribution system. Compressed air from the main air compressor station is further dried in two dryers located in each nuclear island before entering the compressed air distribution system for instrumentation. Two emergency air compressors, equipped with emergency power supplies, are also located before the dryers in the nuclear island. The compressed air production system pressure is automatically controlled. When the main pipe pressure drops to a certain value, the standby air compressor is started first. If the pressure continues to drop, the gas supply of the public compressed air system is cut off to ensure the compressed air for the instruments. If the pressure continues to drop, the emergency air compressor is started. If the pressure continues to drop, the compressed air for the conventional island and other users' instruments is cut off to ensure the gas demand of the nuclear island users.

[0004] The main drawback of this technical solution is the high equipment cost. The two units are equipped with a total of 7 air compressors and dryers. The emergency air compressor is basically in standby status and requires daily maintenance and regular testing.

[0005] like Figure 2As shown in the figure, the second scheme currently adopted for the compressed air supply system of the nuclear power plant is: the main air compressor station for compressed air production is shared by all six units in the plant, equipped with six air compressors and dryers. Compressed air wet tanks and dry tanks are placed before and after the dryers. During normal operation and maintenance, four to five air compressor units operate, while one to two remain in standby. Cooling water for the air compressor units is drawn from Units 1 and 2, respectively, via a main pipe, serving as a backup for each other. Power is supplied from the busbars of Units 1 and 2, with three air compressor units connected to the Unit 1 busbar and three to the Unit 2 busbar. The air quality from the main air compressor station meets public compressed air requirements and is directly connected to the public compressed air distribution system. Compressed air from the main air compressor station is further dried in two dryers located in each nuclear island before entering the compressed air distribution system for instrumentation. Two emergency air compressors, equipped with emergency power supplies, are also located before the dryers in the nuclear island. The compressed air production system pressure is automatically controlled. When the main pipe pressure drops to a certain value, the standby air compressor is started first. If the pressure continues to drop, the gas supply of the public compressed air system is cut off to ensure the compressed air for the instruments. If the pressure continues to drop, the emergency air compressor is started. If the pressure continues to drop, the compressed air for the conventional island and other users' instruments is cut off to ensure the gas demand of the nuclear island users.

[0006] The main drawbacks of this technical solution are the high equipment cost and lower gas supply reliability than Option 1. The six units are equipped with a total of 18 air compressors and dryers. The emergency air compressors are basically in standby mode and require daily maintenance and regular testing. The power supply and cooling water sources for the main air compressor station equipment are limited to the first two nuclear power units. Due to the early construction schedule, they cannot be supplied from the units built later. At the same time, the service life of the units built later will also be reduced. In particular, during the maintenance of a busbar, there are only three air compressor units available, which cannot meet the gas needs for normal operation and maintenance of the units. If equipment failure is considered, the gas supply gap will be even greater, and the emergency air compressor units will need to be started to ensure gas for instruments, affecting the unit availability. The maintenance of the plant's main pipe isolation valve will affect the normal operation of multiple units. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a compressed air supply system suitable for a multi-reactor nuclear power plant.

[0008] The technical solution adopted by the present invention to solve its technical problems is: constructing a compressed air supply system suitable for multi-reactor nuclear power plants, including at most two compressed air stations connected to N nuclear power units through a gas transmission pipeline network, each of the compressed air stations including four main air compressors in parallel and four dryers correspondingly connected to the four main air compressors, and the four dryers are arranged in parallel.

[0009] In some embodiments, two compressed air wet tanks are arranged in parallel between the four main air compressors and the four dryers.

[0010] In some embodiments, two compressed air drying tanks are arranged in parallel between the gas supply ends of the four dryers and the gas supply network.

[0011] In some embodiments, the gas supply ends of the two compressed air dry tanks of each compressed air station are connected to a gas supply main;

[0012] The gas transmission network includes a first gas transmission main pipe and a second gas transmission main pipe, wherein the first gas transmission main pipe is respectively connected to the gas transmission main pipes of all the compressed air stations and the compressed air distribution systems for instruments of all the nuclear power units;

[0013] The second gas transmission main pipe is respectively connected to the gas transmission mains of all the compressed air stations and the same nuclear power plant. The first gas transmission main pipe is respectively connected to the gas transmission main and the public compressed air distribution system of all the nuclear power units.

[0014] In some embodiments, the first gas transmission mother pipe is connected to the gas transmission main pipe via a first connecting pipe; the second gas transmission mother pipe is connected to the gas transmission main pipe via a second connecting pipe.

[0015] In some embodiments, an automatic shut-off valve is provided between the gas main pipe and the second connecting pipe.

[0016] In some embodiments, first isolation valves are respectively provided on both sides of the first gas transmission mother pipe at the connection with the first connecting pipe.

[0017] In some embodiments, a second isolation valve is provided on both sides of the second gas transmission mother pipe at the connection with the second connecting pipe.

[0018] In some embodiments, the first gas transmission main pipe is connected to each of the instrument compressed air distribution systems via a first branch pipe;

[0019] A third isolation valve is provided on both sides of the first gas transmission main pipe at the connection with the first branch pipe.

[0020] In some embodiments, the second gas transmission main pipe is connected to each of the public compressed air distribution systems via a second branch pipe;

[0021] Fourth isolation valves are respectively provided on both sides of the second gas transmission main pipe at the connection with the second branch pipe.

[0022] In some embodiments, each of the instrument compressed air distribution systems includes a first pipeline, wherein a first compressed air tank is provided on the first pipeline;

[0023] One end of the first pipeline is connected to the first branch pipe, and the other end of the first pipeline is connected to gas-consuming equipment of a nuclear island user.

[0024] In some embodiments, each of the instrument compressed air distribution systems includes a second pipeline, and at least two second air compression tanks are provided in parallel on the second pipeline;

[0025] One end of the second pipeline is connected to the first branch pipe, and the other end of the second pipeline is connected to a gas-using device of a conventional island user.

[0026] In some embodiments, a control valve is provided on the second pipeline between the connection point between the first pipeline and the first branch pipe and the second air compression tank.

[0027] In some embodiments, each of the instrument compressed air distribution systems includes a third pipeline, one end of the third pipeline is connected to the downstream of the second air compression tank, and the other end of the third pipeline is connected to the gas-using equipment of other users.

[0028] In some embodiments, the public compressed air distribution system includes a fourth pipeline, and a third compressed air tank is provided on the fourth pipeline;

[0029] One end of the fourth pipeline is connected to the second branch pipe, and the other end of the fourth pipeline is connected to the gas-using equipment of a conventional island user.

[0030] In some embodiments, the public compressed air distribution system includes a fifth pipeline, one end of which is connected to the upstream of the third compressed air tank, and the other end of which is connected to the gas-consuming equipment of the nuclear island user.

[0031] In some embodiments, the public compressed air distribution system includes a sixth pipeline, one end of which is connected to the downstream of the third compressed air tank, and the other end of which is connected to gas-using equipment of other users.

[0032] In some embodiments, a row of power buses is configured for every two main air compressors and the corresponding two dryers.

[0033] In some embodiments, a single compressed air station is equipped with two rows of cooling water pipelines.

[0034] In some embodiments, N=2, 4, or 6;

[0035] When N=2, the number of the compressed air station is one;

[0036] When N=4 or 6, the number of the compressed air stations is two.

[0037] The implementation of the present invention has the following beneficial effects: the compressed air supply system suitable for a multi-reactor nuclear power plant includes at most two compressed air stations connected to N nuclear power units through a gas transmission pipeline network, each compressed air station includes four main air compressors in parallel and four dryers correspondingly connected to the four main air compressors, and the four dryers are arranged in parallel; it reasonably reduces equipment configuration and cost on the basis of meeting the reliability requirements of downstream users for the compressed air supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0039] Figure 1 This is a structural diagram of the first compressed air supply system for a nuclear power plant in the related art;

[0040] Figure 2 This is a schematic structural diagram of a second type of compressed air supply system for a nuclear power plant in the related art;

[0041] Figure 3 It is a structural schematic diagram of a compressed air supply system applicable to a multi-reactor nuclear power plant in some embodiments of the present invention. DETAILED DESCRIPTION

[0042] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0043] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0044] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0045] See also Figure 3 The present invention illustrates a compressed air supply system suitable for a multi-reactor nuclear power plant, comprising up to two compressed air stations 10 connected to N nuclear power units via a gas transmission network 20. Each compressed air station 10 includes four main air compressors 11 connected in parallel and four dryers 12 connected to the four main air compressors 11. The four dryers 12 are arranged in parallel. In some embodiments, the compressed air station 10 can also be defined as a compressed air production system or a main compressed air station.

[0046] Preferably, a control isolation valve may be provided on the pipe section of the air outlet of each main air compressor 11 .

[0047] In some embodiments, two compressed air wet tanks 13 are arranged in parallel between the four main air compressors 11 and the four dryers 12 .

[0048] In some embodiments, two compressed air dry tanks 14 are arranged in parallel between the gas transmission ends of the four dryers 12 and the gas transmission pipeline network 20. The compressed air dry tanks 14 can be used to store compressed air.

[0049] In some embodiments, the gas delivery ends of the two compressed air dry tanks 14 of each compressed air station 10 are connected to a gas delivery main 15. The gas delivery network 20 includes a first gas delivery main 21 and a second gas delivery main 22. The first gas delivery main 21 connects the gas delivery mains 15 of all compressed air stations 10 and the instrument compressed air distribution systems 30 of all nuclear power units.

[0050] The second gas transmission main pipe 22 is respectively connected to the gas transmission main pipes 15 of all compressed air stations 10 and the same nuclear power first gas transmission main pipe 21 which is respectively connected to the gas transmission main pipe 15 and the common compressed air distribution system 40 of all nuclear power units.

[0051] In some embodiments, the first gas transmission main pipe 21 is connected to the gas transmission main pipe 15 via a first connecting pipe 16 ; the second gas transmission main pipe 22 is connected to the gas transmission main pipe 15 via a second connecting pipe 17 .

[0052] Furthermore, an automatic shutoff valve 18 is installed between the gas main 15 and the second connecting pipe 17. When the pressure is low, it automatically cuts off the factory compressed air supply, giving priority to the compressed air users for instruments. When the compressed air pressure drops below 0.76 MPa, the automatic shutoff valve 18 cuts off the public compressed air supply, giving priority to the compressed air users for instruments.

[0053] In some embodiments, first isolation valves 23 are respectively provided on both sides of the first gas transmission main pipe 21 where it is connected to the first connecting pipe 16 .

[0054] In some embodiments, second isolation valves 24 are respectively provided on both sides of the second gas transmission main pipe 22 where it is connected to the second connecting pipe 17 .

[0055] In some embodiments, the first gas transmission main pipe 21 is connected to each instrument compressed air distribution system 30 via a first branch pipe 25 ; third isolation valves 26 are provided on both sides of the first gas transmission main pipe 21 at the connection with the first branch pipe 25 .

[0056] In some embodiments, the second gas transmission main pipe 22 is connected to each public compressed air distribution system 40 via a second branch pipe 27 , and fourth isolation valves 28 are respectively provided on both sides of the second gas transmission main pipe 22 at the connection with the second branch pipe 27 .

[0057] Preferably, the first isolation valve 23 , the second isolation valve 24 , the third isolation valve 26 and the fourth isolation valve 28 may be ball valves or solenoid valves.

[0058] It is understandable that double isolation valves are installed before and after the branch pipes leading to different units, which can effectively ensure the segmented maintenance of the gas supply network and isolation valves. Only one nuclear power unit is affected.

[0059] In some embodiments, each instrument compressed air distribution system 30 includes a first pipeline 31, on which a first compressed air tank 32 is provided; one end of the first pipeline 31 is connected to the first branch pipe 25, and the other end of the first pipeline 31 is connected to the gas-using equipment of the nuclear island user.

[0060] In some embodiments, each instrument compressed air distribution system 30 includes a second pipeline 33, on which at least two second air compression tanks 34 are connected in parallel. One end of the second pipeline 33 is connected to the first branch pipe 25, and the other end of the second pipeline 33 is connected to the gas-using equipment of a conventional island user.

[0061] In some embodiments, a control valve 35 is provided on the second pipeline 33 between the connection point of the first pipeline 31 and the first branch pipe 25 and the second air pressure tank 34 to control the connection between the first pipeline 31 and the second pipeline 33. The control valve 35 can automatically cut off when the pressure of the compressed air is lower than 0.58 MPa.

[0062] In some embodiments, each instrument compressed air distribution system 30 includes a third pipeline 36 , one end of the third pipeline 36 is connected to the downstream of the second air compression tank 34 , and the other end of the third pipeline 36 is connected to gas-consuming equipment of other users.

[0063] In some embodiments, the public compressed air distribution system 40 includes a fourth pipeline 41, on which at least one third compressed air tank 42 is provided; one end of the fourth pipeline 41 is connected to the second branch pipe 27, and the other end of the fourth pipeline 41 is connected to the gas-using equipment of conventional island users.

[0064] Preferably, the public compressed air distribution system 40 includes a fifth pipeline 43, one end of the fifth pipeline 43 is connected to the upstream of the third compressed air tank 42, and the other end of the fifth pipeline 43 is connected to the gas-consuming equipment of the nuclear island user.

[0065] Preferably, the public compressed air distribution system 40 includes a sixth pipeline 44 , one end of which is connected to the downstream of the third compressed air tank 42 , and the other end of which is connected to gas-using equipment of other users.

[0066] Preferably, every two main air compressors 11 and the corresponding two dryers 12 are configured with a row of power bus bars.

[0067] Preferably, a single compressed air station 10 is equipped with two rows of cooling water pipelines.

[0068] It can be understood that each compressed air station 10 introduces two power supply busbars to ensure that when one busbar is under maintenance, the capacity of the remaining air compressor units can meet the normal operating gas consumption of two nuclear power units. The two closed cooling water systems from different nuclear power units or self-installed cooling water circulation devices have a dual power switching system to ensure the normal functioning of the cooling water system.

[0069] Preferably, N=2, 4 or 6;

[0070] When N=2, that is, the number of the nuclear power units is 2, the number of the compressed air station 10 is one, that is, one compressed air station 10 provides the required compressed air for the two nuclear power units;

[0071] When N=4 or 6, the number of the compressed air stations (10) is two, that is, the number of the nuclear power units is 4 or 6, and the two compressed air stations 10 provide the required compressed air to the 4 or 6 nuclear power units.

[0072] In some embodiments, a thermometer for detecting temperature may be provided on the pipeline within the gas pipeline network 20. Preferably, a pressure gauge for detecting air pressure may be provided on the pipeline within the gas pipeline network 20. Preferably, a dew point meter may be provided on the pipeline within the gas pipeline network 20.

[0073] The number and location of the thermometer, pressure gauge, and dew point meter can be selected according to actual needs and are not specifically limited here.

[0074] In some embodiments, check valves may be provided on the pipelines within the gas transmission network 20 to prevent backflow of compressed air. The number and location of the check valves may be selected based on actual needs and are not specifically limited here.

[0075] This plan proposes a compressed air supply system suitable for multi-reactor nuclear power plants from the perspective of overall planning and phased implementation of nuclear power plants. The main features include: eliminating the emergency air compressors, dryers, and front and rear compressed air tanks installed in the nuclear island. The first and second phases of the project will each construct a main air compression station in stages and connect them to the network for air supply. The air supply quality will meet the instrument air requirements at one time and also meet the public compressed air quality requirements. The total capacity of the air compressors configured in each main air compression station will meet the air demand for the operation and maintenance of two nuclear power units, and there will be at least two spare air compressors, generally four air compressors and dryers. The total capacity of the air compressors configured in the two air compression stations must be calculated to meet the air demand for the operation and maintenance of six nuclear power units, and there will be at least two spare air compressors. Each main air compressor station introduces two power supply busbars to ensure that when one busbar is under maintenance, the capacity of the remaining air compressor units can meet the normal operating gas demand of two nuclear power units. The two closed cooling water systems from different nuclear power units or the self-installed cooling water circulation devices have a dual power switching system to ensure the normal function of the cooling water system. The compressed air for instruments and the compressed air for plant use are respectively drawn out from the main air compressor station, and the head and tail ends of the plant distribution main pipe are connected to the two main air compressor stations respectively. When the phased construction is carried out, the corresponding plant main pipes and isolation valves of units 5 and 6 can be installed and cleaned. Figure 3 The inner dashed pipe section was removed. Dual isolation valves were installed before and after the branch pipes to different units, effectively ensuring segmented maintenance of the gas supply network and valves. Only one nuclear power unit was affected. An automatic isolation valve was installed on the main compressed air main pipe in the main air compressor station, automatically shutting off the compressed air supply when pressure is low, prioritizing the needs of instrument users.

[0076] Understandably, this compressed air supply system for multi-reactor nuclear power plants not only meets the reliability requirements of downstream users, but also rationally reduces equipment configuration and costs. Spare air compressors and dryers within the plant are fully shared through networking, and the rational design of the power and water sources for the air compressor units effectively meets the compressed air needs of other units during busbar maintenance. This also creates conditions for online maintenance of plant pipelines and valves, thereby improving unit availability. Through the rational design of multiple automatic pressure control systems and barrier measures, the needs of instrument compressed air users, especially those in the nuclear island, are effectively guaranteed, thereby ensuring the stable and safe operation of the units.

[0077] The technical solution of the present invention has a great cost advantage in a six-unit nuclear power plant with eight air compressors and dryers compared to 21 units in Solution 1 and 18 units in Solution 2.

[0078] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A compressed air supply system suitable for a multi-reactor nuclear power plant, characterized in that: The invention comprises at most two compressed air stations (10) connected to N nuclear power units via a gas transmission network (20), each of the compressed air stations (10) comprising four main air compressors (11) connected in parallel and four dryers (12) connected to the four main air compressors (11) respectively, and the four dryers (12) are arranged in parallel; Two compressed air wet tanks (13) arranged in parallel are arranged between the four main air compressors (11) and the four dryers (12); Two compressed air drying tanks (14) are arranged in parallel between the gas transmission ends of the four dryers (12) and the gas transmission network (20); The gas delivery ends of the two compressed air dry tanks (14) of each compressed air station (10) are connected to a gas delivery main (15); The gas transmission network (20) includes a first gas transmission main pipe (21) and a second gas transmission main pipe (22), wherein the first gas transmission main pipe (21) is respectively connected to the gas transmission main pipes (15) of all the compressed air stations (10) and the instrument compressed air distribution systems (30) of all the nuclear power units; The second gas transmission main pipe (22) is respectively connected to the gas transmission main pipes (15) of all the compressed air stations (10) and the same nuclear power plant; the first gas transmission main pipe (21) is respectively connected to the gas transmission main pipe (15) and the common compressed air distribution system (40) of all the nuclear power units.

2. The compressed air supply system for a multi-reactor nuclear power plant according to claim 1, characterized in that: The first gas transmission main pipe (21) is connected to the gas transmission main pipe (15) via a first connecting pipe (16); the second gas transmission main pipe (22) is connected to the gas transmission main pipe (15) via a second connecting pipe (17).

3. The compressed air supply system for a multi-reactor nuclear power plant according to claim 2, characterized in that: An automatic shut-off valve (18) is provided between the gas transmission main pipe (15) and the second connecting pipe (17).

4. The compressed air supply system for a multi-reactor nuclear power plant according to claim 2, characterized in that: First isolation valves (23) are respectively provided on both sides of the first gas transmission main pipe (21) at the connection with the first connecting pipe (16).

5. The compressed air supply system for a multi-reactor nuclear power plant according to claim 2, characterized in that: Second isolation valves (24) are respectively provided on both sides of the second gas transmission main pipe (22) at the connection with the second connecting pipe (17).

6. The compressed air supply system for a multi-reactor nuclear power plant according to claim 5, characterized in that: The first gas transmission main pipe (21) is connected to each of the instrument compressed air distribution systems (30) via a first branch pipe (25); Third isolation valves (26) are respectively provided on both sides of the first gas transmission main pipe (21) at the connection with the first branch pipe (25).

7. The compressed air supply system for a multi-reactor nuclear power plant according to claim 6, characterized in that: The second gas transmission main pipe (22) is connected to each of the public compressed air distribution systems (40) via a second branch pipe (27); Fourth isolation valves (28) are respectively provided on both sides of the second gas transmission main pipe (22) at the connection with the second branch pipe (27).

8. The compressed air supply system for a multi-reactor nuclear power plant according to claim 7, characterized in that: Each of the instrument compressed air distribution systems (30) comprises a first pipeline (31), wherein a first compressed air tank (32) is provided on the first pipeline (31); One end of the first pipeline (31) is connected to the first branch pipe (25), and the other end of the first pipeline (31) is connected to gas-using equipment of a nuclear island user.

9. The compressed air supply system for a multi-reactor nuclear power plant according to claim 8, characterized in that: Each of the instrument compressed air distribution systems (30) includes a second pipeline (33), and at least two second air compression tanks (34) are provided in parallel on the second pipeline (33); One end of the second pipeline (33) is connected to the first branch pipe (25), and the other end of the second pipeline (33) is connected to a gas-using device of a conventional island user.

10. The compressed air supply system for a multi-reactor nuclear power plant according to claim 9, characterized in that: A control valve (35) is provided on the second pipeline (33) between the connection point between the first pipeline (31) and the first branch pipe (25) and the second air pressure tank (34).

11. The compressed air supply system for a multi-reactor nuclear power plant according to claim 10, characterized in that: Each of the instrument compressed air distribution systems (30) includes a third pipeline (36), one end of the third pipeline (36) is connected to the downstream of the second air compression tank (34), and the other end of the third pipeline (36) is connected to gas-using equipment of other users.

12. The compressed air supply system for a multi-reactor nuclear power plant according to claim 11, characterized in that: The public compressed air distribution system (40) includes a fourth pipeline (41), and a third compressed air tank (42) is provided on the fourth pipeline (41); One end of the fourth pipeline (41) is connected to the second branch pipe (27), and the other end of the fourth pipeline (41) is connected to a gas-using device of a conventional island user.

13. The compressed air supply system for a multi-reactor nuclear power plant according to claim 12, characterized in that: The public compressed air distribution system (40) includes a fifth pipeline (43), one end of the fifth pipeline (43) is connected to the upstream of the third compressed air tank (42), and the other end of the fifth pipeline (43) is connected to the gas-using equipment of the nuclear island user.

14. The compressed air supply system for a multi-reactor nuclear power plant according to claim 12, characterized in that: The public compressed air distribution system (40) includes a sixth pipeline (44), one end of which is connected to the downstream of the third compressed air tank (42), and the other end of which is connected to gas-using equipment of other users.

15. The compressed air supply system for a multi-reactor nuclear power plant according to any one of claims 1 to 14, characterized in that: Each two main air compressors (11) and the corresponding two dryers (12) are equipped with a row of power busbars.

16. The compressed air supply system for a multi-reactor nuclear power plant according to any one of claims 1 to 14, characterized in that: A single compressed air station (10) is equipped with two rows of cooling water pipelines.

17. The compressed air supply system for a multi-reactor nuclear power plant according to any one of claims 1 to 14, characterized in that: N = 2, 4, or 6; When N=2, the number of the compressed air station (10) is one; When N=4 or 6, the number of the compressed air stations (10) is two.

Images