Hydrogen supply system for generator of nuclear power plant

Abstract

The utility model discloses a nuclear power plant generator hydrogen supply system which comprises a hydrogen supply module and a discharge module, the hydrogen supply module comprises a hydrogen supply pipeline, and the hydrogen supply pipeline is provided with a hydrogen supply solenoid valve, a first pressure gauge, a pressure reducing valve assembly, a flowmeter assembly, a hydrogen supply isolation valve, a second pressure gauge and an explosion-proof pressure switch; the pressure reducing valve assembly comprises a first pressure reducing branch pipe, a second pressure reducing branch pipe and a second branch pipe, the first pressure reducing branch pipe is provided with a first pressure reducing valve, a first valve and a second valve, the second pressure reducing branch pipe is provided with a second pressure reducing valve, a third valve and a fourth valve, and the second branch pipe is provided with a second bypass valve; the flow meter assembly comprises a flow meter, a fifth valve and a sixth valve; the discharging module comprises a discharging pipeline, and the discharging pipeline is provided with a first discharging isolating valve, a seventh valve and a fireproof electromagnetic valve; the nuclear power plant generator hydrogen supply system can monitor hydrogen pressure in the nuclear power plant generator, can stably provide hydrogen for the nuclear power plant generator, and ensures safe and stable operation of the nuclear power plant generator.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a hydrogen supply system for a generator in a nuclear power plant. Background Art

[0002] The generator of a nuclear power plant needs to be supplied with hydrogen to cool it and improve the power generation efficiency. In the related technology, the hydrogen pressure of the nuclear power plant generator is usually tested during its shutdown. When it is detected that the pressure of the nuclear power plant generator is insufficient, the staff supplies hydrogen to the nuclear power plant generator through air compressors and other equipment. After a certain volume of hydrogen is input, monitoring is carried out until the pressure requirement is met. The operation is cumbersome and the labor cost is high. In addition, if there is a lack of hydrogen during the operation of the nuclear power plant generator, it is easy to affect the operating stability and safety of the nuclear power plant generator. For example, when the temperature of the nuclear power plant generator is too high, it is easy to cause damage to its internal components. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a hydrogen supply system for a generator of a nuclear power plant.

[0004] The utility model solves the technical problem by adopting the following technical solution: constructing a hydrogen supply system for a nuclear power plant generator, comprising a hydrogen supply module and an exhaust module, wherein the hydrogen supply module comprises a hydrogen supply pipeline, wherein a first end of the hydrogen supply pipeline is connected to a hydrogen source, and a second end of the hydrogen supply pipeline is connected to an upper hydrogen manifold of the nuclear power plant generator;

[0005] The hydrogen supply pipeline is provided with a hydrogen supply solenoid valve, a first pressure gauge, a pressure reducing valve assembly, a flow meter assembly, a hydrogen supply isolation valve, a second pressure gauge, and an explosion-proof pressure switch in sequence from the first end to the second end thereof;

[0006] The hydrogen supply module also includes a first branch pipe connected in parallel at both ends of the hydrogen supply solenoid valve, and a first bypass valve is provided on the first branch pipe; the pressure reducing valve assembly includes a first pressure reducing branch pipe, a second pressure reducing branch pipe and a second branch pipe arranged in parallel, a first pressure reducing valve is provided on the first pressure reducing branch pipe, a first valve and a second valve are respectively provided upstream and downstream of the first pressure reducing valve, a second pressure reducing valve is provided on the second pressure reducing branch pipe, a third valve and a fourth valve are respectively provided upstream and downstream of the second pressure reducing valve, and a second bypass valve is provided on the second branch pipe;

[0007] The flow meter assembly includes a flow meter, and a fifth valve and a sixth valve are respectively provided upstream and downstream of the flow meter; the hydrogen supply module also includes a third branch pipe connected in parallel upstream of the fifth valve and downstream of the sixth valve, and a third bypass valve is provided on the third branch pipe;

[0008] The discharge module comprises a discharge pipeline, the first end of which is connected to the lower hydrogen manifold of the nuclear power plant generator, and the second end of which is connected to the gas collection system or the emptying device; the hydrogen supply pipeline is provided with a first discharge isolation valve, a seventh valve and a fire-proof solenoid valve in sequence from the first end to the second end thereof; the discharge module further comprises a fourth branch pipe, the two ends of which are respectively connected to the upstream of the seventh valve and the downstream of the fire-proof solenoid valve, and the fourth branch pipe is provided with a fourth bypass valve;

[0009] The discharge module further includes a fifth branch pipe, one end of which is connected downstream of the hydrogen supply isolation valve, the other end of which is connected downstream of the first discharge isolation valve, and a second discharge isolation valve is provided on the fifth branch pipe.

[0010] In some embodiments, the nuclear power plant generator hydrogen supply system further includes a safety pipeline, which is respectively connected to the upstream of the hydrogen supply solenoid valve and the downstream of the fire protection solenoid valve, and a safety valve is provided on the safety pipeline.

[0011] In some embodiments, the hydrogen supply pipeline is located upstream of the hydrogen supply solenoid valve and is further provided with a first control valve and a second control valve;

[0012] One end of the safety pipeline is connected to a section of the hydrogen supply pipeline between the first control valve and the second control valve.

[0013] In some embodiments, the nuclear power plant generator hydrogen supply system further includes a measurement pipeline connected to the nuclear power plant generator;

[0014] The measuring pipeline is provided with a hydrogen purity analyzer.

[0015] In some embodiments, the number of the hydrogen purity analyzers is at least two.

[0016] In some embodiments, a flame arrester is provided at the second end of the exhaust line.

[0017] In some embodiments, a third pressure gauge is provided on the exhaust pipeline.

[0018] In some embodiments, a hydrogen flow meter is provided on the exhaust pipeline.

[0019] In some embodiments, the hydrogen supply pipeline is provided with a first check valve.

[0020] In some embodiments, the discharge line is provided with a second check valve.

[0021] The implementation of the utility model has the following beneficial effects: the hydrogen supply system of the nuclear power plant generator can monitor the hydrogen pressure in the nuclear power plant generator, and can stably supply hydrogen to the nuclear power plant generator to ensure the safe and stable operation of the nuclear power plant generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 It is a structural schematic diagram of a hydrogen supply system for a nuclear power plant generator in some embodiments of the utility model;

[0024] Figure 2 It is a partial detail diagram of the hydrogen supply system of the nuclear power plant generator in some embodiments of the utility model. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods 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, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0026] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, 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 intermediate 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 technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0027] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0028] See also Figure 1 and Figure 2 The utility model shows a hydrogen supply system for a nuclear power plant generator, which can be used to stably supply hydrogen to the nuclear power plant generator.

[0029] The hydrogen supply system of the nuclear power plant generator may include a hydrogen supply module 10 and an exhaust module 20. The hydrogen supply module 10 includes a hydrogen supply pipeline 11. The first end of the hydrogen supply pipeline 11 is connected to a hydrogen source, which may be a hydrogen production and distribution system (SHY). The second end of the hydrogen supply pipeline 11 is connected to an upper hydrogen manifold 101 of the nuclear power plant generator 100.

[0030] The hydrogen supply pipeline 11 is provided with a hydrogen supply solenoid valve 12, a first pressure gauge 13, a pressure reducing valve assembly 14, a flow meter assembly 15, a hydrogen supply isolation valve 16, a second pressure gauge 17, and an explosion-proof pressure switch 18 in sequence from the first end to the second end.

[0031] The hydrogen supply module 10 also includes a first branch pipe 19 connected in parallel at both ends of the hydrogen supply solenoid valve 12, and a first bypass valve 110 is provided on the first branch pipe 19; the pressure reducing valve assembly 14 includes a first pressure reducing branch pipe 141, a second pressure reducing branch pipe 142 and a second branch pipe 143 arranged in parallel, a first pressure reducing valve 1411 is provided on the first pressure reducing branch pipe 141, and a first valve 1412 and a second valve 1413 are respectively provided upstream and downstream of the first pressure reducing valve 1411, a second pressure reducing valve 1421 is provided on the second pressure reducing branch pipe 142, and a third valve 1422 and a fourth valve 1423 are respectively provided upstream and downstream of the second pressure reducing valve 1421, and a second bypass valve 1431 is provided on the second branch pipe 143.

[0032] The flow meter assembly 15 includes a flow meter 151, and a fifth valve 152 and a sixth valve 153 are respectively provided upstream and downstream of the flow meter 151; the hydrogen supply module 10 also includes a third branch pipe 111 connected in parallel upstream of the fifth valve 152 and downstream of the sixth valve 153, and a third bypass valve 112 is provided on the third branch pipe 111.

[0033] The discharge module 20 includes a discharge pipeline 21, a first end of which is connected to the lower hydrogen manifold 102 of the nuclear power plant generator 100, and a second end of which is connected to a gas collection system or an emptying device; the hydrogen supply pipeline 11 is provided with a first discharge isolation valve 22, a seventh valve 23 and a fire-proof solenoid valve 24 in sequence from its first end to its second end; the discharge module 20 also includes a fourth branch pipe 25, two ends of which are respectively connected to the upstream of the seventh valve 23 and the downstream of the fire-proof solenoid valve 24, and a fourth bypass valve 26 is provided on the fourth branch pipe 25.

[0034] The discharge module 20 further includes a fifth branch pipe 27 , one end of which is connected downstream of the hydrogen supply isolation valve 16 , and the other end of which is connected downstream of the first discharge isolation valve 22 . A second discharge isolation valve 28 is disposed on the fifth branch pipe 27 .

[0035] In some embodiments, the hydrogen supply system for the generator of the nuclear power plant further comprises a safety pipeline 30, which is respectively connected to the upstream of the hydrogen supply solenoid valve 12 and the downstream of the fire protection solenoid valve 24, and is provided with a safety valve 31. In some embodiments, the hydrogen supply pipeline 11 is further provided with a first control valve 113 and a second control valve 114 upstream of the hydrogen supply solenoid valve 12; one end of the safety pipeline 30 is connected to a section of the hydrogen supply pipeline 11 between the first control valve 113 and the second control valve 114.

[0036] It can be understood that a safety valve 31 is provided. When the pressure on the hydrogen supply pipeline 11 is higher than 14 bar.g, the safety valve 31 automatically opens to release pressure to the atmosphere, thereby playing a role of overpressure protection.

[0037] In some embodiments, the nuclear power plant generator hydrogen supply system further includes a measuring pipeline 40 connected to the nuclear power plant generator 100 ; a hydrogen purity analyzer 41 is disposed on the measuring pipeline 40 .

[0038] In some embodiments, the number of the hydrogen purity analyzers 41 is at least two, for example, the number of the hydrogen purity analyzers 41 may be two, one for use and one for backup. A three-way valve may be provided on the measuring pipeline 40, and the two hydrogen purity analyzers 41 may be connected in parallel to one valve port of the three-way valve.

[0039] In some embodiments, a flame arrester 29 is disposed at the second end of the exhaust pipe 21 .

[0040] In some embodiments, a third pressure gauge is provided on the discharge pipeline 21 .

[0041] In some embodiments, a hydrogen flow meter is provided on the exhaust pipeline 21 .

[0042] In some embodiments, the hydrogen supply pipeline 11 is provided with a first check valve.

[0043] In some embodiments, the discharge line 21 is provided with a second check valve.

[0044] The application of hydrogen supply system for generators in nuclear power plants is as follows:

[0045] The rated pressure of hydrogen in the nuclear power plant generator 100 is 5.2 bar.g, and the purity of hydrogen is not less than 95%. When the hydrogen in the nuclear power plant generator 100 comes from the hydrogen production and distribution system (SHY), its normal hydrogen supply pressure is 11 bar.g, and the pressure is monitored by the first pressure gauge 13.

[0046] During normal operation, the hydrogen supply solenoid valve 12 is opened, and the hydrogen supplied by the hydrogen production and distribution system (SHY) is reduced in pressure to 5.2 bar.g through the first pressure reducing valve 1411 and / or the second pressure reducing valve 1421, and passes through the fifth valve 152, the flow meter 151, and the sixth valve 153. The flow meter 151 is used to detect the instantaneous flow rate and cumulative flow rate of hydrogen that must be supplemented into the nuclear power plant generator 100 during normal operation due to hydrogen leakage in the entire system of the nuclear power plant generator 100. The hydrogen finally enters the upper hydrogen manifold 101 of the nuclear power plant generator 100 through the hydrogen supply isolation valve 16.

[0047] When starting hydrogen charging, the hydrogen supply solenoid valve 12 is closed, the first valve 1412, the second valve 1413, the third valve 1422, the fourth valve 1423, the fifth valve 152 and the sixth valve 153 are closed, and the hydrogen supplied by the hydrogen production and distribution system (SHY) directly flows through the first bypass valve 110, the second bypass valve 1431, the third bypass valve 112, and enters the upper hydrogen manifold 101 of the nuclear power plant generator 100 through the hydrogen supply isolation valve 16. When the reading of the second pressure gauge 17 rises to 5.2 bar.g and the readings of the hydrogen purity analyzer 41 all rise to above 96%, each hydrogen supply valve can be set to the normal operating state.

[0048] The fire-proof solenoid valve 24 is provided to remotely open the discharge pipeline 21 when an emergency occurs in the power plant (such as a fire in the plant). When an emergency occurs in the plant, the fire-proof solenoid valve 24 opens, and the hydrogen is discharged into the atmosphere through the flame arrester 29.

[0049] When the fire-proof solenoid valve 24 is opened, the hydrogen supply solenoid valve 12 can be interlocked and closed to avoid the forced discharge of hydrogen while continuously supplying hydrogen to the nuclear power plant generator 100. When the hydrogen pressure in the nuclear power plant generator 100 drops to 20KPa.g, the fire-proof solenoid valve 24 can be closed by the explosion-proof pressure switch 18 to prevent air from entering the nuclear power plant generator 100.

[0050] During normal operation, the first pressure reducing valve 1411 and the second pressure reducing valve 1421 can be automatically controlled to maintain the hydrogen pressure in the nuclear power plant generator 100 at 5.2 bar.g. When the hydrogen pressure is lower than 4.9 bar.g, an alarm signal can be sent to the main control room or the terminal of the staff. The hydrogen purity analyzer 41 can continuously sample and monitor the hydrogen purity. When the hydrogen purity in the nuclear power plant generator 100 is lower than 90%, an alarm signal can be sent to the main control room or the terminal of the staff. When the hydrogen purity analyzer 41 detects that the hydrogen purity is lower than the normal required value of 95%, the hydrogen is simultaneously filled and discharged for purification.

[0051] The simultaneous charging and exhausting and purification operation of hydrogen is as follows: first close the second discharge isolation valve 28, open the second bypass valve 1431, replenish the hydrogen pressure of the nuclear power plant generator 100, then open the first discharge isolation valve 22, open the fourth bypass valve 26, maintain the dynamic balance of hydrogen supply and exhaust of the nuclear power plant generator 100 (make the hydrogen flow entering the nuclear power plant generator 100 equal to the hydrogen flow discharged), until the hydrogen purity in the nuclear power plant generator 100 is increased to more than 97%, then close the second bypass valve 1431, the first discharge isolation valve 22, and the fourth bypass valve 26 at the same time, and open the second discharge isolation valve 28. This method is simple and effective to operate, and only one operation is required to increase the hydrogen purity in the nuclear power plant generator 100 to more than 97%. During the entire operation process, the hydrogen pressure of the nuclear power plant generator 100 is always maintained at 5.2 bar.g, and no disturbance is caused to various parameters of the nuclear power plant generator 100.

[0052] It can be understood that the hydrogen supply system of the nuclear power plant generator can monitor the hydrogen pressure in the nuclear power plant generator 100, and can stably provide hydrogen to the nuclear power plant generator 100 to ensure the safe and stable operation of the nuclear power plant generator 100.

[0053] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A hydrogen supply system for a nuclear power plant generator, characterized in that: The invention comprises a hydrogen supply module (10) and an exhaust module (20), wherein the hydrogen supply module (10) comprises a hydrogen supply pipeline (11), a first end of the hydrogen supply pipeline (11) is connected to a hydrogen source, and a second end of the hydrogen supply pipeline (11) is connected to an upper hydrogen manifold (101) of a nuclear power plant generator (100); The hydrogen supply pipeline (11) is provided with a hydrogen supply solenoid valve (12), a first pressure gauge (13), a pressure reducing valve assembly (14), a flow meter assembly (15), a hydrogen supply isolation valve (16), a second pressure gauge (17), and an explosion-proof pressure switch (18) in sequence from the first end to the second end; The hydrogen supply module (10) further comprises a first branch pipe (19) connected in parallel to both ends of the hydrogen supply solenoid valve (12), and a first bypass valve (110) is provided on the first branch pipe (19); the pressure reducing valve assembly (14) comprises a first pressure reducing branch pipe (141), a second pressure reducing branch pipe (142) and a second branch pipe (143) arranged in parallel, a first pressure reducing valve (1411) is provided on the first pressure reducing branch pipe (141), a first valve (1412) and a second valve (1413) are respectively provided upstream and downstream of the first pressure reducing valve (1411), a second pressure reducing valve (1421) is provided on the second pressure reducing branch pipe (142), a third valve (1422) and a fourth valve (1423) are respectively provided upstream and downstream of the second pressure reducing valve (1421), and a second bypass valve (1431) is provided on the second branch pipe (143); The flow meter assembly (15) comprises a flow meter (151), and a fifth valve (152) and a sixth valve (153) are respectively provided upstream and downstream of the flow meter (151); the hydrogen supply module (10) further comprises a third branch pipe (111) connected in parallel upstream of the fifth valve (152) and downstream of the sixth valve (153), and a third bypass valve (112) is provided on the third branch pipe (111); The discharge module (20) comprises a discharge pipeline (21), wherein a first end of the discharge pipeline (21) is connected to a lower hydrogen manifold (102) of the nuclear power plant generator (100), and a second end of the discharge pipeline (21) is connected to a gas collection system or an emptying device; the hydrogen supply pipeline (11) is provided with a first discharge isolation valve (22), a seventh valve (23) and a fire-proof electromagnetic valve (24) in sequence from the first end to the second end; the discharge module (20) further comprises a fourth branch pipe (25), wherein two ends of the fourth branch pipe (25) are respectively connected to the upstream of the seventh valve (23) and the downstream of the fire-proof electromagnetic valve (24), and a fourth bypass valve (26) is provided on the fourth branch pipe (25); The discharge module (20) further comprises a fifth branch pipe (27), one end of the fifth branch pipe (27) being connected downstream of the hydrogen supply isolation valve (16), and the other end of the fifth branch pipe (27) being connected downstream of the first discharge isolation valve (22), and a second discharge isolation valve (28) being provided on the fifth branch pipe (27).

2. The hydrogen supply system for a nuclear power plant generator according to claim 1, characterized in that: The nuclear power plant generator hydrogen supply system further comprises a safety pipeline (30), wherein the safety pipeline (30) is respectively connected to the upstream of the hydrogen supply solenoid valve (12) and the downstream of the fire protection solenoid valve (24), and a safety valve (31) is provided on the safety pipeline (30).

3. The hydrogen supply system for a nuclear power plant generator according to claim 2, characterized in that: The hydrogen supply pipeline (11) is located upstream of the hydrogen supply solenoid valve (12) and is also provided with a first control valve (113) and a second control valve (114); One end of the safety pipeline (30) is connected to a section of the hydrogen supply pipeline (11) between the first control valve (113) and the second control valve (114).

4. The hydrogen supply system for a nuclear power plant generator according to claim 1, characterized in that: The nuclear power plant generator hydrogen supply system further comprises a measuring pipeline (40) connected to the nuclear power plant generator (100); The measuring pipeline (40) is provided with a hydrogen purity analyzer (41).

5. The hydrogen supply system for a nuclear power plant generator according to claim 4, characterized in that: The number of the hydrogen purity analyzers (41) is at least two.

6. The hydrogen supply system for a nuclear power plant generator according to claim 1, characterized in that: A flame arrester (29) is provided at the second end of the discharge pipeline (21).

7. The hydrogen supply system for a nuclear power plant generator according to claim 1, characterized in that: The discharge pipeline (21) is provided with a third pressure gauge.

8. The hydrogen supply system for a nuclear power plant generator according to claim 1, characterized in that: The discharge pipeline (21) is provided with a hydrogen flow meter.

9. The hydrogen supply system for a nuclear power plant generator according to claim 1, characterized in that: The hydrogen supply pipeline (11) is provided with a first check valve.

10. The hydrogen supply system for a nuclear power plant generator according to claim 1, characterized in that: The discharge pipeline (21) is provided with a second check valve.

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