Pressure relief system of reactor

Abstract

The utility model provides a pressure relief system of a reactor. The pressure relief system comprises a reactor container, a first pressure relief pipeline, a second pressure relief pipeline and a pressure relief box. The interior of the stack container has a chamber for filling a protective gas. The first pressure relief pipeline is connected with the cavity and provided with an electric valve. The second pressure relief pipeline is connected with the cavity and provided with a first safety valve. The pressure relief box is connected with the first pressure relief pipeline and the second pressure relief pipeline, and a spraying device used for spraying cooling water is arranged in the pressure relief box. According to the pressure relief system, precise graded controllable pressure relief can be achieved, rapid pressure relief can also be achieved when instant ultrahigh pressure is handled, emission obtained after pressure relief is conducted in the pressure relief box is cooled, depressurized and absorbed, and radioactive substance leakage is avoided.

Description

Technical Field

[0001] This application relates to the technical field of nuclear reactor safety equipment, and particularly to a reactor depressurization system. Background Technology

[0002] In a pool-type metallic fast reactor, a steam generator tube rupture (SGTR) accident occurs when one or more heat transfer tubes in the steam generator rupture or crack. This causes high-temperature, high-pressure water in the secondary loop of the steam generator to flash into the primary loop, resulting in a rapid increase in pressure within the primary loop. To ensure the integrity of the primary loop and the reactor vessel, metallic fast reactors typically incorporate a pressure relief system in the primary loop.

[0003] Existing pressure relief systems for metallic fast reactors typically consist of a pressure relief pipeline and a water tank. Specifically, an independent pressure relief pipeline is connected to the primary loop and then to the water tank. A safety valve is installed on the pressure relief pipeline. When the pressure in the primary loop reaches the opening threshold of the safety valve, the safety valve opens, allowing the pressure relief pipeline to flow. The gas-liquid mixture in the primary loop is then fed into the water tank through the pressure relief pipeline. Cooling water is used to cool the mixture and collect it during the pressure relief process, thus completing the pressure relief function of the primary loop.

[0004] However, when the pressure fluctuations in the primary circuit are large, the current pressure relief system cannot accurately and controllably perform staged pressure relief in the primary circuit. Utility Model Content

[0005] This application provides a reactor pressure relief system, which connects a first pressure relief pipeline and a second pressure relief pipeline outside the reactor vessel, enabling precise and staged controllable pressure relief. In the event of instantaneous ultra-high pressure, it can achieve rapid pressure relief, protecting the integrity of the primary circuit. Furthermore, a spray device for spraying cooling water is installed in the pressure relief tank, which can cool, depressurize, and absorb the discharged materials after pressure relief, preventing pollutant leakage.

[0006] This application provides a reactor pressure relief system, including a reactor vessel, a first pressure relief line, a second pressure relief line, and a pressure relief tank.

[0007] The stack container has chambers inside for filling with protective gas.

[0008] The first pressure relief line is connected to the chamber and is equipped with an electric valve.

[0009] The second pressure relief line is connected to the chamber, and the second pressure relief line is equipped with a first safety valve.

[0010] The pressure relief box is connected to the first pressure relief pipeline and the second pressure relief pipeline respectively, and the inside of the pressure relief box is equipped with a spray device for spraying cooling water.

[0011] The pressure relief system in the embodiment of the application can realize precise and controllable pressure reduction of the first pressure relief pipeline because the opening pressure value and the closing pressure value of the electric valve can be freely adjusted. The second pressure relief pipeline is a passive pressure relief pipeline. The opening pressure value of the first safety valve arranged in the second pressure relief pipeline is higher than the opening pressure value of the electric valve, and the first safety valve is mainly used for rapid and reliable pressure relief under instantaneous extreme pressure threatening the integrity of the primary loop, and can also ensure the reliability of the pressure relief system when the first pressure relief pipeline fails. When a breakage accident of the heat transfer pipe of the steam generator occurs, the first pressure relief pipeline can relieve pressure for a sustained and small pressure condition, and the second pressure relief pipeline can relieve pressure for an instantaneous and extreme high pressure condition. In any case, the first pressure relief pipeline and the second pressure relief pipeline can send the high-temperature and high-pressure gas-liquid mixture to the pressure relief tank, and at this time, the spraying device starts to spray cooling water into the pressure relief tank, and the spraying process can cool, depressurize and absorb radioactive substances.

[0012] In summary, the pressure relief system in the embodiment of the application can realize precise and controllable pressure relief, can also realize rapid pressure relief when coping with instantaneous super-high pressure, and can cool, depressurize and absorb the discharged substances in the pressure relief tank after pressure relief, thereby avoiding leakage of radioactive substances.

[0013] In a possible design, the first pressure relief pipeline comprises a plurality of sub-pressure relief pipelines arranged in parallel, and each of the sub-pressure relief pipelines is provided with the electric valve.

[0014] In a possible design, each of the sub-pressure relief pipelines is provided with two electric valves arranged in series.

[0015] In a possible design, the reactor vessel, the first pressure relief pipeline, the second pressure relief pipeline and the pressure relief tank are arranged inside the containment, and the pressure relief tank is provided with a pipeline connecting the inside of the pressure relief tank and the inside of the containment, and the pipeline is provided with a second safety valve.

[0016] In a possible design, the application further comprises:

[0017] The cooling water tank is arranged outside the pressure relief tank and is connected with the spraying device through a water delivery pipeline, and the water delivery pipeline is provided with a flow control valve.

[0018] In a possible design, the cooling water tank is located above the spraying device, so that the cooling water can flow into the spraying device by gravity.

[0019] In a possible design, the first pressure relief pipeline extends into the inside tank bottom of the pressure relief tank, and the second pressure relief pipeline extends into the inside tank bottom of the pressure relief tank.

[0020] In a possible design, the inner tank bottom of the pressure relief tank is further provided with a bubbling pipe, and the first pressure relief pipeline and the second pressure relief pipeline are connected with the bubbling pipe.

[0021] In a possible design, in the direction close to the chamber, the plurality of sub-pressure relief pipelines converge into one pipeline connected with the chamber; and in the direction close to the pressure relief tank, the plurality of sub-pressure relief pipelines converge into one pipeline connected with the pressure relief tank.

[0022] In a possible design, the two electric valves are respectively an electric ball valve and an electric isolation valve. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor based on these drawings.

[0024] Figure 1 FIG. 1 is a schematic diagram of a pressure relief system of a reactor provided by an embodiment of the present application.

[0025] FIG. 1 is a schematic diagram of a pressure relief system of a reactor provided by an embodiment of the present application.

[0026] 10, reactor vessel; 11, chamber; 12, metal coolant; 13, steam generator; 14, reactor core; 15, main pump;

[0027] 20, first pressure relief pipeline; 21, sub-pressure relief pipeline; 22, electric valve;

[0028] 30, second pressure relief pipeline; 31, first safety valve;

[0029] 40, pressure relief tank; 41, spraying device; 42, second safety valve; 43, bubbling pipe; 44, cooling water;

[0030] 50, cooling water tank; 51, water conveying pipeline; 52, flow control valve;

[0031] 60, containment. DETAILED DESCRIPTION

[0032] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited. In the present application, unless otherwise explicitly and specifically defined, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise explicitly and specifically defined, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of the present application, it should be understood that the terms "in", "out", "up", "bottom", "front", "back" and the like indicate the orientation or positional relationship (if any) based on the drawings Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0036] It should also be noted that the same reference signs in the embodiments of the present application represent the same component or the same part, and for the same parts in the embodiments of the present application, only one part or component may

[0037] When a steam generator tube rupture accident occurs in a pool type metal fast reactor, that is, one or more heat transfer tubes in the steam generator are ruptured or cracked, the high-temperature and high-pressure water in the secondary loop of the steam generator will flash and enter the primary loop instantaneously, causing the pressure in the primary loop to rise rapidly. To ensure the integrity of the primary loop and the reactor vessel, a pressure relief system is usually arranged in the primary loop of the metal fast reactor. The pressure relief system usually consists of a pressure relief pipeline and a water tank, that is, an independent pressure relief pipeline is connected to the primary loop, the pressure relief pipeline is connected to the water tank, and a safety valve is arranged on the pressure relief pipeline. When the pressure in the primary loop reaches the opening threshold of the safety valve, the safety valve opens to make the pressure relief pipeline conductive, and the gas-liquid mixture in the primary loop is discharged into the water tank through the pressure relief pipeline, and the mixture discharged during the pressure relief is cooled and collected by using cooling water, so as to complete the pressure relief function of the primary loop. However, when the pressure in the primary loop fluctuates greatly, the current pressure relief system cannot accurately and controllably perform staged pressure relief.

[0038] Therefore, in order to solve the above technical problems, the present application provides a pressure relief system of a reactor, which is connected to a first pressure relief pipeline and a second pressure relief pipeline outside the reactor vessel, can realize accurate and controllable staged pressure relief, can realize rapid pressure relief when dealing with instantaneous overpressure, protects the integrity of the primary loop, and further provides a spraying device for spraying cooling water in the pressure relief tank, which can cool, depressurize and absorb the discharge after pressure relief, and avoid pollution leakage.

[0039] The pressure relief system provided by the embodiments of the present application will be described in detail in combination with the drawings.

[0040] Figure 1 is a schematic diagram of the pressure relief system of the reactor provided by the embodiments of the present application. As shown in Figure 1 The pressure relief system of the reactor provided by the embodiments of the present application includes a reactor vessel 10, a first pressure relief pipeline 20, a second pressure relief pipeline 30 and a pressure relief tank 40.

[0041] The reactor vessel 10 is filled with a certain liquid level of liquid metal coolant 12, which is a kind of cooling medium composed of low-melting-point alkali metals and low-melting-point alloys, etc., and has the characteristics of large specific heat capacity and thermal conductivity, low melting point and high boiling point. The liquid metal coolant 12 used in the embodiments of the present application includes but is not limited to metal sodium, metal lead, sodium-potassium alloy, gallium-indium alloy, etc.

[0042] The upper part of the liquid metal coolant 12 has a certain space, so that a cavity 11 is formed between the liquid metal coolant 12 and the inner wall of the reactor vessel 10, and the cavity 11 is filled with inert protective gas (such as argon). The liquid metal coolant 12 exchanges heat with the top cover of the reactor vessel 10 through the protective gas.

[0043] In addition, the reactor vessel 10 is also provided with a steam generator 13, a reactor core 14, a main pump 15, etc. Among them, the steam generator 13 is a heat exchange device for generating steam required by a steam turbine, the heat generated by nuclear fission in the reactor core 14 is taken out by the liquid metal coolant 12, and the heat is transferred to the working medium (such as water) in the secondary circuit through the steam generator 13, so that the working medium generates steam with a certain temperature and pressure. The steam enters the steam turbine to do work and is converted into electric energy or mechanical energy. In this energy conversion process, the steam generator 13 is both a device of the primary circuit and a device of the secondary circuit, and therefore is called the hub of the primary circuit and the secondary circuit. The main pump 15 is used to drive the liquid metal coolant 12 to circulate in the reactor vessel 10, so that the heat generated in the reactor core 14 can be continuously transferred to the working medium in the secondary circuit of the steam generator 13.

[0044] The first pressure relief pipeline 20 is connected with the chamber 11, and the first pressure relief pipeline 20 is provided with an electric valve 22. Among them, the electric valve 22 is composed of an electric actuator and a valve, the electric valve 22 uses electric energy as power to drive the valve through the electric actuator to realize the opening and closing action of the valve, so as to achieve the opening and closing purpose of the first pressure relief pipeline 20. In addition, the electric valve 22 can be electrically connected with a pressure sensor and a controller in the system, a pressure threshold value is set in the controller, the pressure sensor monitors the pressure value in the system in real time and sends the pressure value to the controller, and when the pressure value received by the controller exceeds the pressure threshold value, the controller sends a driving instruction to the electric valve 22 to open it.

[0045] The second pressure relief pipeline 30 is connected with the chamber 11, and the second pressure relief pipeline 30 is provided with a first safety valve 31. Among them, the first safety valve 31 is a closing member in a normally closed state under the action of external force, and only when the pressure of the gas-liquid mixture in the second pressure relief pipeline 30 rises above the pressure threshold value, the first safety valve 31 automatically opens, part of the gas and liquid in the reactor vessel 10 is discharged out of the reactor vessel 10 through the second pressure relief pipeline 30, so that the pressure of the primary circuit does not exceed the safety value, thereby ensuring that the primary circuit does not occur due to the pressure being too high.

[0046] The pressure relief tank 40 is connected with the first pressure relief pipeline 20 and the second pressure relief pipeline 30 respectively, and the inside of the pressure relief tank 40 is provided with a spraying device 41 for spraying cooling water 44. Among them, the spraying device 41 is a device widely used in the fields of agricultural irrigation, industrial paint spraying, fire fighting and rescue, etc., which is usually composed of a spray head, a spray pipe, a spray nozzle, a pipeline, etc., and its main function is to spray liquid on the target. In the present application, the spraying device 41 can spray the cooling water 44 in the pressure relief tank 40 to cool, depressurize and absorb radioactive substances of the high-temperature and high-pressure gas-liquid mixture discharged by the first pressure relief pipeline 20 and the second pressure relief pipeline 30.

[0047] The pressure relief system in the embodiments of the present application can realize precise and controllable pressure relief because the opening pressure value and the closing pressure value of the electric valve 22 can be freely adjusted. The second pressure relief pipeline 30 is a passive pressure relief pipeline. The opening pressure value of the first safety valve 31 arranged in the second pressure relief pipeline 30 is higher than the opening pressure value of the electric valve 22, and the first safety valve 31 is mainly used for fast and reliable pressure relief under instantaneous extreme pressure threatening the integrity of the primary loop. Meanwhile, the first safety valve 31 can ensure the reliability of the pressure relief system when the first pressure relief pipeline 20 fails. When the breakage accident of the heat transfer pipe of the steam generator 13 occurs, the first pressure relief pipeline 20 can relieve pressure for a sustained and small pressure condition, and the second pressure relief pipeline 30 can relieve pressure for an instantaneous and extreme high pressure condition. In any case, the first pressure relief pipeline 20 and the second pressure relief pipeline 30 can send the high-temperature and high-pressure gas-liquid mixture to the pressure relief tank 40, and at this time, the spraying device 41 starts to spray cooling water 44 into the pressure relief tank 40. The spraying process can cool, depressurize and absorb radioactive substances of the high-temperature and high-pressure gas-liquid mixture.

[0048] In summary, the pressure relief system in the embodiments of the present application can realize precise and controllable pressure relief, and can also realize fast pressure relief when coping with instantaneous superhigh pressure. In addition, the pressure relief system can cool, depressurize and absorb the discharged substances in the pressure relief tank 40, thereby avoiding the leakage of radioactive substances.

[0049] Regarding the specification and size design of the first safety valve 31, the discharge area parameter of the first safety valve 31 can be calculated and the specification and size of the safety valve can be determined according to the pressure opening threshold, the discharge flow parameter and the discharge medium characteristics through the following formula.

[0050] W = 5.25AP d K sh

[0051] Wherein, W is the discharge flow, unit: kg / s; A is the discharge area, unit: mm 2 ; P d is the discharge pressure, unit: MPa.a; K sh is the superheat correction coefficient.

[0052] The first pressure relief pipeline 20 can be a main pipeline or can be composed of a plurality of parallelly arranged sub-pipelines. Specifically, in some embodiments provided by the present application, the first pressure relief pipeline 20 includes a plurality of parallelly arranged sub-pressure relief pipelines 21, and each sub-pressure relief pipeline 21 is provided with an electric valve 22. For example, as shown in FIG. 1, the first pressure relief pipeline 20 includes two parallelly arranged sub-pressure relief pipelines 21. Alternatively, the first pressure relief pipeline 20 includes three or four parallelly arranged sub-pressure relief pipelines 21. Figure 1

[0053] ​In the embodiment, the first pressure relief pipeline 20 comprises a plurality of sub-pressure relief pipelines 21 arranged in parallel, and each sub-pressure relief pipeline 21 is provided with an electric valve 22, which reduces the overall failure rate of the first pressure relief pipeline 20. Even if one or more sub-pressure relief pipelines 21 fail, the reliability of the pressure relief function can be ensured by the other sub-pressure relief pipelines 21, thereby improving the overall reliability of the first pressure relief pipeline 20.

[0054] In an embodiment provided by the application, in the direction close to the chamber 11, the plurality of sub-pressure relief pipelines 21 converge into one pipeline connected to the chamber 11; and in the direction close to the pressure relief tank 40, the plurality of sub-pressure relief pipelines 21 converge into one pipeline connected to the pressure relief tank 40.

[0055] In the embodiment, the plurality of sub-pressure relief pipelines 21 converge into one pipeline connected to the chamber 11, that is, the chamber 11 is connected to the plurality of sub-pressure relief pipelines 21 through one interface; and the plurality of sub-pressure relief pipelines 21 converge into one pipeline connected to the pressure relief tank 40, that is, the pressure relief tank 40 is connected to the plurality of sub-pressure relief pipelines 21 through one interface. In this way, the number of interfaces provided on the stack container 10 and the pressure relief tank 40 can be reduced, thereby reducing the manufacturing difficulty of the stack container 10 and the pressure relief tank 40, and reducing the sealing difficulty of the pipelines. In addition, the fewer interfaces can also ensure the structural integrity of the stack container 10 and the pressure relief tank 40, so as to improve the structural strength and pressure resistance of the stack container 10 and the pressure relief tank 40.

[0056] In an embodiment provided by the application, each sub-pressure relief pipeline 21 is provided with two electric valves 22 arranged in series.

[0057] In the embodiment, the two electric valves 22 arranged in series mainly prevent one-way circuit mispressure relief caused by misoperation of one of the electric valves 22.

[0058] In an embodiment provided by the application, the two electric valves 22 are respectively an electric ball valve and an electric isolation valve.

[0059] The electric ball valve can be referred to as an angular stroke electric valve, which is used in cooperation with an angular stroke electric actuator to realize 90-degree rotation control of the valve to control the on-off of the pipeline fluid. The electric isolation valve can be referred to as a straight stroke electric valve, which is used in cooperation with a straight stroke electric actuator to realize up-down action control of the valve plate to control the on-off of the pipeline fluid. In the embodiment, the electric ball valve and the electric isolation valve have simple structures and high reliability.

[0060] In an embodiment provided by the application, the stack container 10, the first pressure relief pipeline 20, the second pressure relief pipeline 30 and the pressure relief tank 40 are arranged inside the containment 60, the pressure relief tank 40 is provided with a pipeline connecting the inside of the pressure relief tank 40 and the inside of the containment 60, and the pipeline is provided with a second safety valve 42.

[0061] The containment vessel 60 protects the nuclear facility from adverse external influences. It is a large, specialized container structure. The containment vessel 60 can be single-layered or double-layered. The inner layer of the double-layered containment vessel is called the primary containment vessel, and the outer layer is called the secondary containment vessel. An annular cavity exists between the two layers to maintain a certain negative pressure, preventing the leakage of radioactive materials inside the reactor vessel 10 to the outside. In this embodiment, to prevent the pressure relief tank 40 from overpressure rupture due to a sudden extreme pressure release in the primary circuit, which could lead to a large release of radioactivity, the pressure relief tank 40 is equipped with a pipeline connecting its interior to the containment vessel 60. This pipeline is equipped with a second safety valve 42. When the pressure inside the pressure relief tank 40 becomes too high and cannot be reduced by means of spraying, the second safety valve 42 is triggered and opens, releasing some pressure into the containment vessel 60.

[0062] In one embodiment provided in this application, the pressure relief system further includes a cooling water tank 50, which is disposed outside the pressure relief tank 40 and connected to the spray device 41 via a water supply pipeline 51. The water supply pipeline 51 is equipped with a flow control valve 52.

[0063] In this embodiment, when the pressure in the pressure relief tank 40 is too high or the water level is insufficient, the flow control valve 52 is opened manually or automatically to perform spray pressure reduction and water replenishment operations.

[0064] The flow control valve 52 can be an electric valve, and the flow control valve 52 is normally closed, so that the water pressure in the water supply pipeline 51 is always maintained. In this way, when the flow control valve 52 is opened, the cooling water 44 can quickly enter the spray device 41.

[0065] The cooling water 44 in the cooling water tank 50 can be pumped into the spray device 41 by a water pump, or it can flow into the spray device 41 automatically by gravity. In one embodiment provided in this application, the cooling water tank 50 is located above the spray device 41 so that the cooling water 44 can flow into the spray device 41 by gravity.

[0066] In this embodiment, the cooling water 44 can automatically flow to the spray device 41 by gravity, thereby saving the cost of purchasing and maintaining the water pump, and also saving the space required for water pump installation on site.

[0067] Cooling water 44 can be pre-filled into the pressure relief tank 40, so that the gas-liquid mixture in the first pressure relief line 20 and the second pressure relief line 30 can come into contact with the cooling water 44 and be cooled down the moment it enters the pressure relief tank 40, without having to wait for the spray device 41 to start.

[0068] The cooling water 44 in the pressure relief tank 40 cannot be too much, otherwise the containing volume in the pressure relief tank 40 will be reduced, and too little cooling water 44 will make the gas-liquid mixture discharged from the first pressure relief pipeline 20 and the second pressure relief pipeline 30 unable to effectively contact. In order to solve this problem, in an embodiment provided by the present application, the first pressure relief pipeline 20 extends into the inner tank bottom of the pressure relief tank 40, and the second pressure relief pipeline 30 extends into the inner tank bottom of the pressure relief tank 40. In this way, even if the cooling water 44 in the pressure relief tank 40 is less, the gas-liquid mixture discharged from the first pressure relief pipeline 20 and the second pressure relief pipeline 30 can still contact the cooling water 44.

[0069] In an embodiment provided by the present application, the inner tank bottom of the pressure relief tank 40 is further provided with a bubbling pipe 43, and the first pressure relief pipeline 20 and the second pressure relief pipeline 30 are connected with the bubbling pipe 43.

[0070] In the embodiment, the main function of the bubbling pipe 43 is to realize sufficient contact between the gas and the liquid. The bubbling pipe 43 is provided with a plurality of small holes with a diameter of 3mm-6mm. When the gas flow enters the bubbling pipe 43, it is dispersed into a plurality of small bubbles from the small holes, and the small bubbles can fully contact the cooling water 44, so that the cooling water 44 can fully absorb the radioactive substances in the gas.

[0071] It is particularly noted that the small amount of cooling water 44 pre-filled in the pressure relief tank 40 needs to be submerged in the bubbling pipe 43.

[0072] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A reactor pressure relief system characterized by, The application relates to a stack container (10) with a chamber (11) for filling with a protective gas, a first pressure relief line (20) connected to the chamber (11), the first pressure relief line (20) being provided with an electrically operated valve (22), a second pressure relief line (30) connected to the chamber (11), the second pressure relief line (30) being provided with a first safety valve (31), and a pressure relief tank (40) connected to the first pressure relief line (20) and the second pressure relief line (30), respectively, the pressure relief tank (40) being provided with a spraying device (41) for spraying cooling water (44) inside the pressure relief tank (40). The first pressure relief line (20) comprises a plurality of sub-pressure relief lines (21) connected in parallel, each of the sub-pressure relief lines (21) being provided with the electrically operated valve (22). Each of the sub-pressure relief lines (21) is provided with two electrically operated valves (22) connected in series. The stack container (10), the first pressure relief line (20), the second pressure relief line (30) and the pressure relief tank (40) are arranged inside a safety shell (60), the pressure relief tank (40) being provided with a pipeline connecting the inside of the pressure relief tank (40) with the inside of the safety shell (60), the pipeline being provided with a second safety valve (42). The application further relates to a cooling water tank (50) arranged outside the pressure relief tank (40) and connected to the spraying device (41) through a water supply line (51), the water supply line (51) being provided with a flow control valve (52).

2. The reactor relief system of claim 1, wherein, The cooling water tank (50) is arranged above the spraying device (41) so that the cooling water (44) can flow into the spraying device (41) by gravity.

3. The reactor relief system of claim 2, wherein, The first pressure relief line (20) extends into the bottom of the pressure relief tank (40), and the second pressure relief line (30) extends into the bottom of the pressure relief tank (40).

4. The reactor relief system of claim 1, wherein, The bottom of the pressure relief tank (40) is further provided with a bubbling pipe (43), the first pressure relief line (20) and the second pressure relief line (30) being connected to the bubbling pipe (43).

5. The reactor relief system of claim 1, wherein, In the direction close to the chamber (11), a plurality of the sub-pressure relief lines (21) converge into one line connected to the chamber (11); in the direction close to the pressure relief tank (40), a plurality of the sub-pressure relief lines (21) converge into one line connected to the pressure relief tank (40). The two electrically operated valves (22) are electrically operated ball valves and electrically operated isolation valves, respectively.

6. The reactor relief system of claim 5, wherein, ​ 7. The reactor pressure relief system according to any one of claims 1-6, wherein, ​ 8. The reactor relief system of claim 7, wherein, ​ 9. The reactor pressure relief system of claim 2 or 3, wherein, ​ 10. The reactor pressure relief system of claim 3, wherein, ​

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