Auxiliary pressure relief device

Abstract

This invention relates to an auxiliary pressure relief device for venting gases within the containment building of a nuclear power plant. The device includes a diversion pipeline and a pressure relief assembly. The diversion pipeline includes an installation end and a connection end. The installation end is detachably connected to and communicates with the containment's exhaust pipe. The inlet end of the pressure relief assembly is connected to and communicates with the connection end, and the exhaust end of the pressure relief assembly is connected to the external environment. At least a portion of the gas flowing through the exhaust pipe can flow along the diversion pipeline to the pressure relief assembly for discharge. When the containment undergoes a pressure test and the test gas within it is discharged, the gas can be discharged simultaneously through the containment's own pressure relief system and this auxiliary pressure relief device, increasing the pressure relief rate, saving time required for the pressure relief process, and thus enabling a more rapid reduction in pressure inside the containment, shortening the containment pressure test period.

Description

Technical Field

[0001] This invention relates to the field of nuclear power safety technology, and in particular to auxiliary pressure relief devices. Background Technology

[0002] The containment vessel is the third safety barrier of a nuclear power plant. Every ten years after its construction, the first refueling overhaul, and commercial operation, the containment vessel needs to be tested to verify its structural strength and sealing performance under main circuit accident conditions. The containment pressure test involves collecting and measuring the changes in gas parameters inside the containment over time to analyze and determine the overall leakage rate and leakage volume at the design pressure. After the test is completed, the test gas inside the containment needs to be released to relieve the pressure. In existing technologies, most release of internal gases is achieved through the containment's own pressure relief system. However, this system has a low pressure relief rate, takes a long time, and depletes the overhaul period, impacting the economics of the nuclear power plant. Summary of the Invention

[0003] Therefore, it is necessary to provide an auxiliary depressurization device to address the technical problem that the depressurization time is long due to the low depressurization rate during gas depressurization after containment pressure testing in existing technologies, which affects the overall progress of unit overhaul.

[0004] An auxiliary pressure relief device for venting gases within a nuclear power plant containment vessel, characterized in that the auxiliary pressure relief device comprises: a diversion pipeline including an installation end and a connection end, the installation end being detachably connected to and communicating with an exhaust pipe of the containment vessel; and a pressure relief assembly, the inlet end of which is connected to and communicating with the connection end, and the exhaust end of which is communicating with the external environment; wherein at least a portion of the gas flowing through the exhaust pipe can flow along the diversion pipeline to the pressure relief assembly for discharge.

[0005] In one embodiment, the branch pipeline includes a main pipe, and both the installation end and the connection end are connected to the main pipe; the number of connection ends is at least two, and the at least two connection ends are arranged at intervals along the length direction of the main pipe, and each connection end is connected to a set of pressure relief components.

[0006] In one embodiment, the diversion pipeline includes a multi-way valve and multiple connecting pipes; the multi-way valve has multiple ports, one of which serves as the installation end, and one of the multiple connecting pipes is selectively connected to the remaining ports as the connection end, and each connection end is correspondingly connected to a set of pressure relief components.

[0007] In one embodiment, a branch pipe is connected to the exhaust pipe, and the installation end of the diversion pipe is detachably connected to the branch pipe.

[0008] In one embodiment, one of the branch pipe and the mounting end is provided with a first connecting ring that protrudes radially outward, and the other of the branch pipe and the mounting end is provided with a second connecting ring that protrudes radially outward; the auxiliary pressure relief device further includes a locking member that passes through the first connecting ring and the second connecting ring to lock them together; or, the mounting end has a threaded section that is threadedly connected to the branch pipe.

[0009] In one embodiment, the pressure relief assembly includes an isolation valve and an exhaust fan; the isolation valve is connected to a pipeline whose connection end is connected to the air inlet end of the pressure relief assembly, and the isolation valve is used to control the connection and disconnection between the diversion pipeline and the pressure relief assembly; the exhaust fan is installed on the side of the isolation valve facing the exhaust end of the pressure relief assembly; when the isolation valve is in the open state, the gas flowing out through the diversion pipeline can be discharged to the external environment under the pressure difference between the inside and outside of the containment and the power of the exhaust fan.

[0010] In one embodiment, the pressure relief assembly further includes a filter unit installed between the isolation valve and the exhaust fan; when the isolation valve is in the open state, the gas flowing out through the diversion pipe can be filtered by the filter unit.

[0011] In one embodiment, the filtration unit includes a first filter and a second filter; the first filter and the second filter are spaced apart along the gas discharge direction, and the first filter is located on the side close to the isolation valve; the first filter is used to perform primary filtration of the gas, and the second filter is used to perform secondary filtration of the gas, wherein the particle size of the primary filter is larger than the particle size of the secondary filter.

[0012] In one embodiment, the filtration unit further includes a radioactive element filter, which is installed on the side of the second filter opposite to the first filter; the radioactive element filter is used to filter radioactive elements in the gas after the secondary filtration.

[0013] In one embodiment, the pressure relief assembly further includes a radiation monitor installed between the radioactive element filter and the exhaust fan, the radiation monitor being used to monitor the radioactive element content of the gas after it has been filtered by the radioactive element filter.

[0014] In one embodiment, the number of pressure relief components is at least two, and the at least two pressure relief components are connected in series so that at least a portion of the gas flowing through the exhaust pipe can be discharged along the diversion pipe and after flowing through at least two pressure relief components.

[0015] In one embodiment, the auxiliary pressure relief device further includes a mounting housing, in which the pressure relief assembly is housed; the connecting end extends into the mounting housing to connect with the air inlet of the pressure relief assembly; or, the air inlet of the pressure relief assembly extends out of the mounting housing to connect with the connecting end.

[0016] The beneficial effects of this invention are:

[0017] When the containment undergoes a pressure test and the test gas is released, the installation end of the branch line of this auxiliary pressure relief device is connected to the containment's exhaust pipe. At least a portion of the gas flowing through the exhaust pipe can then flow along the branch line to the pressure relief assembly. Since the exhaust end of the pressure relief assembly is connected to the external environment, this portion of the gas can be discharged through the pressure relief assembly. Because the gas can be discharged simultaneously through the containment's own pressure relief system and this auxiliary pressure relief device, the pressure relief rate is increased, saving the time required for the pressure relief process. This allows for a more rapid reduction in pressure inside the containment, shortening the containment pressure test period. It also allows sufficient time for containment maintenance after the pressure test, avoiding disruption to the overall schedule of the unit's overhaul and improving the economic efficiency of the nuclear power plant. Furthermore, during normal use, if a sudden severe accident occurs that causes an abnormality in the containment's own pressure relief system, this auxiliary pressure relief device can also be used to depressurize the containment, making the use of the containment safer. After the auxiliary depressurization of the containment is completed, the diversion line and the exhaust pipe are disconnected so that this auxiliary depressurization device can provide auxiliary depressurization for different containments, thereby improving economic efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the auxiliary pressure relief device provided in the first embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the pressure relief components of the auxiliary pressure relief device shown;

[0020] Figure 3 This is a schematic diagram of the auxiliary pressure relief device provided in the second embodiment of the present invention.

[0021] Reference numerals: 100-Pressure relief assembly; 110-Isolation valve; 120-Flow regulating valve; 130-Hygrometer; 140-Heater; 150-Flow meter; 160-Filter unit; 161-First filter; 162-Second filter; 163-Radioactive element filter; 170-Radiation monitor; 180-Exhaust fan; 200-Exhaust pipe; 300-External environment; 400-Mounting housing. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] See Figures 1-3 , Figure 1 A schematic diagram of the auxiliary pressure relief device provided in the first embodiment of the present invention is shown;

[0029] Figure 2 It shows Figure 1 A schematic diagram of the pressure relief assembly 100 of the auxiliary pressure relief device shown; Figure 3 A schematic diagram of an auxiliary pressure relief device provided in a second embodiment of the present invention is shown. The auxiliary pressure relief device provided in this embodiment of the present invention is used to discharge gas within the containment building of a nuclear power plant, and includes a diversion pipeline and a pressure relief assembly 100. The diversion pipeline includes an installation end and a connection end; the installation end is detachably connected to and communicates with the exhaust pipe 200 of the containment building; the inlet end of the pressure relief assembly 100 is connected to and communicates with the connection end, and the exhaust end of the pressure relief assembly 100 is used to communicate with the external environment 300; wherein at least a portion of the gas flowing through the exhaust pipe 200 can flow along the diversion pipeline to the pressure relief assembly 100 for discharge.

[0030] When the containment undergoes a pressure test and the test gas inside is released, the installation end of the branch pipe of this auxiliary pressure relief device is connected to the exhaust pipe 200 of the containment. Therefore, at least a portion of the gas flowing through the exhaust pipe 200 can flow along the branch pipe to the pressure relief assembly 100. Since the exhaust end of the pressure relief assembly 100 is connected to the external environment 300, this portion of the gas can be discharged through the pressure relief assembly 100. Because the gas can be discharged simultaneously through the containment's own pressure relief system and this auxiliary pressure relief device, the pressure relief rate is increased, saving the time required for the pressure relief process. This allows for a more rapid reduction in pressure inside the containment, shortening the containment pressure test period. It also allows sufficient time for containment maintenance after the pressure test, avoiding impact on the overall schedule of the unit overhaul and improving the economic efficiency of the nuclear power plant. When the containment vessel is in normal use and a sudden, severe accident occurs causing an abnormality in its own pressure relief system, this auxiliary pressure relief device can depressurize the containment vessel, making its use safer. After auxiliary pressure relief of the containment vessel is completed, the branch line and exhaust pipe 200 are disconnected so that this auxiliary pressure relief device can be used for auxiliary pressure relief of different containment vessels, improving economic efficiency.

[0031] It should be noted that in one embodiment, the containment pressure test is performed using a penetration device, and the pressurization line is removed after pressurization. Due to the design of the ventilation system, the depressurization rate of the containment's own depressurization system is currently limited to 140 mbar / h. If the depressurization rate is increased, the entire depressurization system's ductwork and isolation valves need to be modified, resulting in a large amount of work and high costs. For a containment pressure test conducted every 10 years, modifying the system is not cost-effective. After the containment pressure test, the penetration device is connected to the installation end of the branch line of this auxiliary depressurization device through a pipeline. During the depressurization phase, while ensuring the depressurization rate is 140 mbar / h in the system's depressurization channel, this auxiliary depressurization device can further increase the depressurization rate. Therefore, it is not necessary to modify the system's ductwork and isolation valves, resulting in lower costs. Furthermore, it can be used by multiple containments, enabling shared use across multiple plants, reducing power plant expenses, and providing good economic benefits.

[0032] In practical use, increasing the depressurization rate to 160 mbar / h using this auxiliary depressurization device can shorten the depressurization time by 4 hours; increasing it to 200 mbar / h can shorten it by 9 hours; and increasing it to 240 mbar / h can shorten it by 12.5 hours. It is evident that this auxiliary depressurization device can significantly shorten the time required for the depressurization process, thereby allowing for a more rapid reduction in pressure inside the containment and shortening the containment pressure test period. It also allows sufficient time for containment maintenance after the pressure test.

[0033] In one specific embodiment, when a severe accident occurs during normal operation of a nuclear power plant, if the internal pressure of the nuclear power plant building rises and the pressure relief system's own pressure relief channels malfunction, radioactive gases in the nuclear power plant building may be unable to be discharged through the containment building's own pressure relief system, and the pressure may not be reduced. In this case, this auxiliary pressure relief device can be used to release pressure from the containment building, making the use of the containment building safer.

[0034] The following is a detailed description of the structure of the auxiliary pressure relief device.

[0035] In one embodiment, the diversion conduit includes a main pipe, and both the installation end and the connection end are connected to the main pipe. There are at least two connection ends, spaced apart along the length of the main pipe, and each connection end is connected to a set of pressure relief components 100. Because there are at least two connection ends, and each connection end is connected to a set of pressure relief components 100, different numbers of pressure relief components 100 can be selected to be connected through multiple connection ends according to the target pressure relief rate requirement of the containment, making the pressure relief rate of the containment controllable, faster, flexible, and convenient. In one specific embodiment, there are four connection ends, so this auxiliary pressure relief device can connect up to four sets of pressure relief components 100. Of course, in other embodiments, the number of connection ends can also be two, three, five, six, or seven, etc., without limitation, and can be adaptively adjusted according to the maximum pressure relief rate required by the containment.

[0036] In one embodiment, the diversion pipeline includes a multi-port valve and multiple connecting pipes. The multi-port valve has multiple ports, one of which serves as the installation end. Multiple connecting pipes are selectively connected to the remaining ports as connection ends, and each connection end corresponds to a set of pressure relief components 100. Using the multiple ports of the multi-port valve as the installation end and multiple connection ends of the diversion pipeline simplifies the overall structure of the pipeline. In one specific embodiment, the multi-port valve has five ports, one of which is the installation end, and the other four are connection ends. Therefore, a maximum of four sets of pressure relief components 100 can be connected. Of course, in other embodiments, the number of ports of the multi-port valve can also be three, four, six, seven, etc., without limitation, and can be adaptively adjusted according to the maximum pressure relief rate required by the containment.

[0037] In one specific embodiment, a branch pipe is connected to the exhaust pipe 200, and the mounting end of the diversion pipe is detachably connected to the branch pipe. By connecting the branch pipe to the exhaust pipe 200, the mounting end of the diversion pipe is detachably connected to the branch pipe. This allows the diversion pipe to communicate with the exhaust pipe 200 and to divert and discharge the gas within the exhaust pipe 200.

[0038] In one embodiment, the exhaust pipe 200 has a connecting hole for a connecting pipe on its side wall, and the installation end of the diversion pipe is detachably connected to the wall of the connecting hole, thereby enabling the diversion pipe to communicate with the exhaust pipe 200 and to divert and discharge the gas in the exhaust pipe 200.

[0039] In one embodiment, one of the branch pipe and the mounting end is constructed with a first connecting ring protruding radially outward, and the other of the branch pipe and the mounting end is constructed with a second connecting ring protruding radially outward. The auxiliary pressure relief device also includes a locking member, which passes through the first connecting ring and the second connecting ring to lock them together. By passing the locking member through the first connecting ring and the second connecting ring, the first connecting ring and the second connecting ring are locked together, thereby connecting the branch pipe and the mounting end. After the auxiliary pressure relief operation is completed, the locking member can be detached from the first connecting ring and the second connecting ring, making the operation relatively simple and convenient.

[0040] In one specific embodiment, the locking element is a threaded connector and a nut. One of the first connecting ring and the second connecting rod has a threaded hole, and the first and second connecting rings are locked together by the engagement of the threaded connector and the nut. In another specific embodiment, the locking element is a rivet. The rivet passes through the connecting holes on the first and second connecting rings for riveting, thereby locking the first and second connecting rings.

[0041] In some embodiments, the mounting end has a threaded section that connects to the branch pipe via a thread. By directly constructing threaded sections on both the mounting end and the branch pipe, a threaded connection is achieved between the mounting end and the branch pipe, thus enabling a detachable connection between them, which is relatively simple and convenient. When auxiliary depressurization of the containment is required using this auxiliary depressurization device, the mounting end is screwed onto the branch pipe thread. After the auxiliary depressurization operation is completed, the mounting end is screwed off in the opposite direction to separate it from the branch pipe, making the operation simple and convenient.

[0042] Please see Figure 2 An embodiment of the present invention provides a pressure relief assembly 100 of an auxiliary pressure relief device, which includes a pipe, an isolation valve 110, and an exhaust fan 180. The pipe is used to install the mounting components of the entire pressure relief assembly 100. The isolation valve 110 is connected to the pipe whose connecting end is connected to the air inlet end of the pressure relief assembly 100, and is used to control the opening and closing of the diversion pipe and the pressure relief assembly 100. The exhaust fan 180 is installed on the pipe on the side of the isolation valve 110 facing the exhaust end of the pressure relief assembly 100. When the isolation valve 110 is in the open state, the gas flowing out through the diversion pipe can be discharged to the external environment 300 under the pressure difference between the inside and outside of the containment and the power of the exhaust fan 180.

[0043] The connection and disconnection between the diversion pipe and the pressure relief assembly 100 are controlled by the isolation valve 110, making the entire auxiliary pressure relief device safer. If an emergency stop is required during the auxiliary pressure relief process of the containment vessel, only the isolation valve 110 needs to be closed. The exhaust fan 180 provides power to discharge the gas entering the pressure relief assembly 100 into the external environment 300, allowing the gas to be discharged more quickly, increasing the pressure relief rate, and reducing the time required for the pressure relief process.

[0044] Please see Figure 2 The pressure relief component 100 of the auxiliary pressure relief device provided in one embodiment of the present invention further includes a flow regulating valve 120. The flow regulating valve 120 is installed on the pipe on the side of the isolation valve 110 away from the exhaust pipe 200. The flow regulating valve 120 can regulate the flow rate of the gas entering the pipe of the pressure relief component 100, so that the emission rate of the gas emission process is controllable.

[0045] Please see Figure 2 The auxiliary pressure relief device provided in one embodiment of the present invention further includes a filter unit 160. The filter unit 160 is installed on the pipeline between the isolation valve 110 and the exhaust fan 180. When the isolation valve 110 is in the open state, the gas flowing out through the diversion pipeline can be filtered by the filter unit 160. By filtering the gas through the filter unit 160, the gas discharged into the external environment 300 meets the emission requirements, making it more environmentally friendly.

[0046] Please see Figure 2 The filter unit 160 of the auxiliary pressure relief device provided in one embodiment of the present invention includes a first filter 161 and a second filter 162. The first filter 161 and the second filter 162 are arranged at intervals along the gas discharge direction, and the first filter 161 is disposed on the pipe near the isolation valve 110. The first filter 161 is used to perform primary filtration of the gas; the second filter 162 is used to perform secondary filtration of the gas, and the particle size of the particles filtered in the primary filtration is larger than that of the particles filtered in the secondary filtration. By setting the first filter 161 and the second filter 162, impurities in the gas can be fully filtered out, resulting in a better filtration effect.

[0047] In one specific embodiment, the first filter 161 filters particles with a diameter greater than 10 μm, and the second filter 162 filters particles with a diameter between 0.01 μm and 10 μm, thereby enabling the removal of aerosols in the gas. Of course, in other embodiments, the first filter 161 may filter particles with a diameter greater than 5 μm, 6 μm, etc., and the second filter 162 may filter particles with a diameter between 0.01 μm and 5 μm, or between 0.01 μm and 6 μm, etc. This is not limited and can be adaptively adjusted according to the filter element specifications of the first filter 161 and the second filter 162.

[0048] In one specific embodiment, the first filter 161 is a pre-filter, which can be a sieve or similar device, used to filter out larger particulate impurities from the gas. It should be noted that there is no limitation on the mesh size of the sieve; it can be adapted to the size of the particulates in the gas. Specifically, the pre-filter is made of glass fiber.

[0049] In one specific embodiment, the second filter 162 is a high-efficiency filter, specifically filter paper, etc. The filter paper removes small particulate impurities from the gas and eliminates odors. It should be noted that the pore size of the filter paper is not limited and can be adapted to the size of the particulate matter in the gas.

[0050] Please see Figure 2 The auxiliary pressure relief device filtration unit 160 provided in one embodiment of the present invention further includes a radioactive element filter 163, which is used to filter and adsorb radioactive elements in the gas. By filtering the radioactive elements in the gas through the radioactive element filter 163, the gas finally discharged into the external environment 300 meets the emission requirements.

[0051] In one specific embodiment, the radioactive element filter 163 is an iodine filter. The iodine filter adsorbs the radioactive element iodine in the gas, thereby ensuring that the iodine content in the gas released to the external environment 300 meets emission requirements. It should be noted that, since the containment of radioactive gases, such as iodine, carbon-14, or tritium, is relatively high, this radioactive element filter 163 can adsorb all radioactive elements in the gas within the containment to meet emission requirements.

[0052] Please see Figure 2 The pressure relief component 100 of the auxiliary pressure relief device provided in one embodiment of the present invention also includes a flow meter 150. The flow meter 150 is installed on the pipeline between the flow regulating valve 120 and the filter unit 160. The flow meter 150 determines the amount of gas flow into the pipeline of the pressure relief component 100, thereby adjusting the opening and closing state of the flow regulating valve 120.

[0053] Please see Figure 2 The pressure relief component 100 of the auxiliary pressure relief device provided in one embodiment of the present invention further includes a hygrometer 130 and a heater 140, which are installed on the pipeline between the isolation valve 110 and the filter unit 160. The hygrometer 130 monitors the humidity of the gas, and then the heater 140 heats the gas to ensure that the humidity of the gas meets the filtration requirements of the iodine filter. In one specific embodiment, two hygrometers 130 are used, respectively positioned on both sides of the heater 140. The dehumidification effect of the heater 140 on the gas can be clearly determined by the displayed values ​​of the two hygrometers 130.

[0054] Please see Figure 2 In one embodiment of the present invention, the pressure relief component 100 of the auxiliary pressure relief device further includes a radiation monitor. The radiation monitor is installed on the pipeline between the radioactive element filter 163 and the exhaust fan 180. The radiation monitor is used to monitor the radioactive element content of the gas after it has passed through the radioactive element filter 163. By monitoring the radioactive element content of the gas after it has passed through the radioactive element filter 163 using a radiation detector, and determining whether the gas meets the emission requirements based on the monitoring results, the emission of the gas is made more environmentally friendly and safer.

[0055] Please see Figure 2In one specific embodiment, there are two radiation monitors 170. One radiation monitor 170 is installed on the pipe between the flow regulating valve 120 and the filter unit 160, and the other radiation monitor 170 is installed on the pipe between the radioactive element filter 163 and the exhaust fan 180. The first radiation monitor 170 monitors the radioactive element content of the gas entering the pressure relief assembly 100 pipe before filtration, and the second radiation monitor 170 monitors the radioactive element content of the gas after filtration by the filter unit 160. By comparing the two monitoring data, the filtration effect of the filter unit 160 on radioactive elements is determined, and the filter unit 160 is improved accordingly.

[0056] Please see Figure 3 The pressure relief device provided in the second embodiment of the present invention has at least two pressure relief components 100 connected in series, so that at least a portion of the gas flowing through the exhaust pipe 200 can be discharged after flowing along the diversion pipe and through at least two pressure relief components 100. By connecting at least two pressure relief components 100 in series, the gas flowing through the exhaust pipe 200 can be filtered by multiple pressure relief components 100, thereby improving the filtration effect of the gas finally flowing out to the external environment 300 and making the gas emission more environmentally friendly and safe.

[0057] In one specific embodiment, there are two pressure relief components 100 connected in series, which allows the gas flowing through the exhaust pipe 200 to be filtered by the two pressure relief components 100 to achieve a double filtration effect. Of course, in other embodiments, there may be three or four pressure relief components connected in series to achieve triple or quadruple filtration of the gas. There is no limitation on this, and it can be adaptively set according to the particulate content and radioactive element content in the gas to meet the gas emission requirements.

[0058] It should be noted that this auxiliary pressure relief device can either connect the pressure relief components 100 in parallel to each other, thereby increasing the pressure relief rate and saving the time required for the pressure relief process; or connect the pressure relief components 100 in series to each other, thereby improving the filtration effect of the gas and making the gas emission more environmentally friendly and safe.

[0059] Please see Figure 1The auxiliary pressure relief device provided in one embodiment of the present invention further includes a mounting housing 400, within which the pressure relief assembly 100 is housed. In one embodiment, a connecting end extends into the mounting housing 400 to connect with the air inlet end of the pressure relief assembly 100. In another embodiment, the air inlet end of the pressure relief assembly 100 extends out of the mounting housing 400 to connect with the connecting end. By providing the mounting housing 400, the pressure relief assembly 100 can be housed within the mounting housing 400, thereby integrating the entire pressure relief assembly 100 within the mounting housing 400. The pressure relief assembly 100 is protected by the mounting housing 400, making it less susceptible to collision damage and easy to transport.

[0060] In one embodiment, the mounting housing 400 is movable, and thus the pressure relief assembly 100 housed within the mounting housing 400 can also be moved by the mounting housing 400. By installing the pressure relief assembly 100 within the movable mounting housing 400, this auxiliary pressure relief device can be moved and transported, thereby enabling sharing among multiple power plants, reducing power plant expenses, and achieving good economic benefits. In one specific embodiment, the mounting housing 400 is a container, and the pressure relief assembly 100 is integrated within the container for easy transportation. Specifically, the bottom of the mounting housing 400 is provided with rollers, and the movement of the entire mounting housing 400 is driven by the rolling of the rollers around their own axes.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An auxiliary pressure relief device for venting gases within the containment vessel of a nuclear power plant, characterized in that, The auxiliary pressure relief device includes: The diversion pipeline includes an installation end and a connection end, wherein the installation end is used to detachably connect and communicate with a branch pipe connected to the exhaust pipe (200) of the containment. A pressure relief assembly (100) is provided, wherein the air inlet of the pressure relief assembly (100) is connected and communicates with the connecting end, and the exhaust end of the pressure relief assembly (100) is used to communicate with the external environment (300); one of the branch pipe and the mounting end is provided with a first connecting ring protruding radially outward, and the other of the branch pipe and the mounting end is provided with a second connecting ring protruding radially outward; the auxiliary pressure relief device further includes a locking member, which passes through the first connecting ring and the second connecting ring to lock the two together; or, the mounting end has a threaded section, which is threadedly connected to the branch pipe; there are multiple connecting ends, and each connecting end is connected to a set of pressure relief assemblies (100). At least a portion of the gas flowing through the exhaust pipe (200) can flow along the diversion pipe to the pressure relief assembly (100) for discharge; Mounting housing (400), the mounting housing (400) is movable, the pressure relief assembly (100) is housed within the mounting housing (400); the connecting end extends into the mounting housing (400) to connect with the air inlet end of the pressure relief assembly (100); or, the air inlet end of the pressure relief assembly (100) extends out of the mounting housing (400) to connect with the connecting end.

2. The auxiliary pressure relief device according to claim 1, characterized in that, The diversion pipeline includes a multi-way valve and multiple connecting pipes; The multi-way valve has multiple ports, one of which serves as the mounting end, and one of the multiple connecting pipes is selectively connected to the remaining ports as the connection end.

3. The auxiliary pressure relief device according to claim 1, characterized in that, The pressure relief assembly (100) includes an isolation valve (110) and an exhaust fan (180). The isolation valve (110) is connected to the pipeline whose connection end is connected to the air inlet end of the pressure relief assembly (100), and the isolation valve (110) is used to control the opening and closing of the diversion pipeline and the pressure relief assembly (100); the exhaust fan (180) is installed on the side of the isolation valve (110) facing the exhaust end of the pressure relief assembly (100); When the isolation valve (110) is in the open state, the gas flowing out through the diversion pipeline can be discharged to the external environment (300) under the pressure difference between the inside and outside of the containment and the power of the exhaust fan (180).

4. The auxiliary pressure relief device according to claim 3, characterized in that, The pressure relief assembly (100) further includes a filter unit (160) installed between the isolation valve (110) and the exhaust fan (180); When the isolation valve (110) is in the open state, the gas flowing out through the diversion pipeline can be filtered by the filter unit (160).

5. The auxiliary pressure relief device according to claim 4, characterized in that, The filter unit (160) includes a first filter (161) and a second filter (162); The first filter (161) and the second filter (162) are spaced apart along the gas discharge direction, and the first filter (161) is located on the side close to the isolation valve (110); The first filter (161) is used to filter the gas once, and the second filter (162) is used to filter the gas twice, wherein the particle size of the particles filtered in the first filter is larger than the particle size of the particles filtered in the second filter.

6. The auxiliary pressure relief device according to claim 5, characterized in that, The filtration unit (160) further includes a radioactive element filter (163), which is installed on the side of the second filter (162) away from the first filter (161); the radioactive element filter (163) is used to filter the radioactive elements in the gas after the secondary filtration.

7. The auxiliary pressure relief device according to claim 6, characterized in that, The number of pressure relief components (100) is at least two, and the at least two pressure relief components (100) are connected in series so that at least a portion of the gas flowing through the exhaust pipe (200) can be discharged along the diversion pipe and after flowing through at least two pressure relief components (100).

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