Rupture disk recovery device and emergency fuel gas blow-off system

Abstract

The invention belongs to the technical field of fuel gas blow-off, and particularly relates to a rupture disk recovery device and an emergency fuel gas blow-off system. In order to prevent fragments generated after rupture of a rupture disk from affecting the flowing characteristics of fluid, the rupture disk recycling device comprises a shell used for covering the rupture disk and a capturing structure arranged in the shell, the shell comprises a baffle used for directly facing the rupture disk and an enclosure frame used for connecting the baffle and a pipeline, and the capturing structure is arranged in the shell. The enclosure frame is provided with outflow holes communicating the inside and the outside of the enclosure frame, a dead cavity is formed in the sides, close to the baffle, of all the outflow holes, and the capturing structure is arranged in the dead cavity. The invention further discloses an emergency fuel gas blow-off system adopting the corresponding rupture disk recovery device. By utilizing the characteristics of the dead cavity, when the rupture disk is just ruptured, the pressure in the dead cavity is lower, so that high-pressure fluid can carry fragments to enter the dead cavity; and after the fragments are captured by the capturing structure, the fluid is difficult to flow through the fragments, so that the influence of the fragments on the flow characteristics of the fluid can be reduced to the greatest extent.

Description

Technical Field

[0001] This invention belongs to the field of gas purging technology, and in particular relates to a rupture disc recovery device and an emergency gas purging system. Background Technology

[0002] When a submarine or underwater platform encounters a major emergency and needs to surface urgently, it is necessary to quickly drain the water from the ballast tanks to ensure that the buoyancy of the submarine or underwater platform is greater than its weight, thus ensuring that the submarine or underwater platform can surface quickly.

[0003] In this field, emergency gas purging systems are commonly used to quickly drain water from ballast tanks. In one common configuration, the emergency gas purging system includes a gas generator equipped with a rupture disc. When an emergency buoyancy is required, fuel in the gas generator burns to produce gas. When the gas pressure reaches a certain value, the rupture disc breaks, and the high-pressure, high-temperature gas enters the ballast tank through a pipeline, carrying the water inside so that the water in the ballast tank can be discharged into the sea through a discharge valve.

[0004] In another common approach, an airbag is installed inside the ballast water tank. When the pressure generated by the gas generator reaches a certain value, the rupture disc breaks, and high-pressure, high-temperature gas enters the airbag through a pipe. The airbag inflates to discharge the water in the ballast water tank into the sea through the discharge valve. For example, Chinese invention patent application CN104890841A, published on September 9, 2015, entitled "A Self-Rescue Device for Submarines Overcoming Descent, Penetration, and Rapid Ascent After Sinking."

[0005] After a rupture disc breaks, it produces fragments. These fragments can not only scratch the inner walls of pipes and other equipment, but also affect the flow path and flow state of the working fluid. Therefore, there is an urgent need to use a rupture disc recovery device to recover the fragments produced after the rupture disc breaks.

[0006] Currently, the following methods for recycling fragments are provided in existing technologies.

[0007] Method 1: Baffles are installed on both sides of the rupture disc, and holes are opened on the baffles to allow airflow.

[0008] For example, Chinese utility model patent with authorization announcement number CN206669049U and authorization announcement date of 2017.11.24 discloses a safety blasting device, which discloses that baffles (i.e., baffles) with through holes are provided on both sides of the blasting disc to block the fragments generated after the blasting disc breaks apart, preventing the fragments from flying out and causing secondary damage.

[0009] Method 2: Install an intercepting net on one side of the rupture disc to intercept fragments after the rupture disc breaks apart.

[0010] For example, the Chinese utility model patent with the publication number CN210600343U and the publication date of May 22, 2020 discloses a zero leakage device special for rupture disc safety device, which discloses that a collection net is arranged on one side of the rupture disc, and the collection net is used to intercept and collect the fragments after the rupture disc is broken.

[0011] The third way is to arrange a magnet on one side of the rupture disc to collect the fragments by the magnet.

[0012] For example, the Chinese utility model patent with the publication number CN213871267U and the publication date of August 3, 2021 discloses a quick rupture protection device, which discloses that a plurality of magnet strips are arranged on one side of the rupture disc, and the magnet strips attract the fragments after the rupture disc is broken to achieve the collection of the fragments.

[0013] However, in the above-mentioned three recycling ways, the perforated baffle, the interception net and the plurality of magnet strips arranged at intervals are all arranged on the side of the rupture disc in the direction of the gas flow, for example, if the gas flows from front to back after the rupture disc is broken, the perforated baffle, the interception net and the plurality of magnet strips arranged at intervals are all arranged on the back side of the rupture disc, which leads to that after the fragments are intercepted by the baffle, the interception net or the magnet strips, the gas flow still passes through the fragments from front to back, and then flows backward through the holes on the baffle, the mesh holes of the interception net or the gaps between the magnet strips. Therefore, the fragments still affect the flow characteristics such as the flow path and the flow state of the working medium.

[0014] In the prior art, the rupture discs corresponding to the above-mentioned three recycling ways (such as the devices in the above-mentioned three Chinese patent documents) are used to be installed on the pressure vessel, the tank or the pipeline, and after the rupture disc is broken, the working medium is discharged to the outside through the pressure relief pipeline or directly discharged to the outside, so as to avoid the over-high pressure in the pressure vessel, the tank or the pipeline, and avoid the damage of the equipment such as the pressure vessel, the tank or the pipeline. That is, after the rupture disc corresponding to the above-mentioned three recycling ways is broken, the flow characteristics of the working medium do not need to be considered, and only the working medium needs to be discharged to the outside, so the above-mentioned three recycling ways (such as the devices in the above-mentioned three Chinese patent documents) can all meet the use requirements.

[0015] However, in the emergency gas blowing system, the main purpose of the rupture disc breaking is to enable the high-temperature and high-pressure gas to reach the ballast tank through the pipeline, and the protection of the gas generator is only a very secondary purpose, so when designing the rupture disc recycling device, the influence of the fragments on the gas flow characteristics must be considered. Since the size and shape of the fragments generated after the rupture disc is broken are uncontrollable, and the position of the fragments is also uncontrollable when the fragments are intercepted by the above-mentioned three recycling ways, the influence of the fragments on the gas flow characteristics is uncontrollable, so there is an urgent need for a new rupture disc recycling device. SUMMARY

[0016] The present application aims to provide a rupture disc recovery device to solve the technical problem that the influence of the fragments on the fluid flow characteristics cannot be controlled when the existing rupture disc recovery method is used.

[0017] The present application also aims to provide an emergency gas blowdown system to solve the same technical problem.

[0018] To achieve the above-mentioned purposes, the technical scheme of the rupture disc recovery device provided by the present application is as follows: A rupture disc recovery device comprises a housing for being installed in a pipeline downstream of a rupture disc and for covering the rupture disc, and a capturing structure arranged in the housing and for capturing the fragments generated after the rupture of the rupture disc, so that all the fragments enter the housing and are captured by the capturing structure when in use. The housing comprises a baffle plate arranged opposite to the rupture disc, and a surrounding frame for connecting the baffle plate and the pipeline. The surrounding frame is provided with flow holes for communicating the inside and outside of the surrounding frame. All the flow holes on the side close to the baffle plate form a dead space, and the capturing structure is arranged in the dead space.

[0019] Further, the capturing structure comprises capturing grooves for capturing the fragments, and the groove width of the capturing grooves gradually decreases with the gradual decrease of the distance from the baffle plate.

[0020] Further, the extension direction of the capturing grooves is perpendicular to the extension direction of the flow holes.

[0021] Further, the capturing grooves are formed by two adjacent surfaces of two adjacent capturing bodies, and the capturing bodies are made of elastic material for enabling the capturing grooves formed by the two adjacent capturing bodies to catch the fragments.

[0022] Further, the capturing structure comprises at least two layers of hole plates, each layer of hole plates is provided with capturing holes, and the size of the capturing holes on each layer of hole plates satisfies that the size of the capturing holes on the hole plate closer to the baffle plate is smaller.

[0023] Further, the capturing structure comprises a net for capturing the fragments.

[0024] Further, the capturing structure comprises a magnet for capturing the fragments.

[0025] Further, the capturing structure is made of high-temperature-resistant material for adapting to the high-temperature and high-pressure gas generated by the gas generator.

[0026] The beneficial effect of the rupture disc recovery device provided by the application is that the fluid flows through the shell, and the fragments generated when the rupture disc breaks can be ensured to be located in the shell and captured by the capturing structure instead of directly entering the pipeline and scratching the inner wall of the pipeline. By using the characteristics of the dead space, the capturing structure is arranged in the dead space. When the rupture disc just breaks, the pressure in the dead space is low, so the high-pressure fluid can carry the fragments into the dead space. After the fragments are captured by the capturing structure, the pressure in the dead space has been increased, so it is difficult for the fluid to flow through the fragments, thereby the influence of the fragments on the fluid flow characteristics can be minimized, and subsequent design is facilitated.

[0027] To achieve the above-mentioned object, the technical scheme of the emergency gas blowdown system provided by the application is as follows: The emergency gas blowdown system comprises a gas generator provided with a high-pressure chamber with a rupture disc and a pipeline connected with the high-pressure chamber and located downstream of the rupture disc. The pipeline is provided with a rupture disc recovery device. The rupture disc recovery device comprises a shell installed in the pipeline and used for covering the rupture disc and a capturing structure arranged in the shell and used for capturing the fragments generated after the rupture disc breaks. In use, all the fragments enter the shell and are captured by the capturing structure. The shell comprises a baffle arranged opposite to the rupture disc and a surrounding frame connecting the baffle and the pipeline. The surrounding frame is provided with flow holes communicating between the inside and outside of the surrounding frame. The side of all the flow holes close to the baffle forms a dead space, and the capturing structure is arranged in the dead space. The capturing structure is made of a high-temperature-resistant material suitable for the gas generated by the gas generator.

[0028] Further, the capturing structure comprises a capturing groove for stopping the fragments. The groove width of the capturing groove gradually decreases with the gradual decrease of the distance from the baffle.

[0029] Further, the extension direction of the capturing groove is perpendicular to the extension direction of the flow hole.

[0030] Further, the capturing groove is a V-shaped groove, and the capturing groove is formed by two adjacent surfaces of two adjacent triangular prism capturing bodies.

[0031] Further, the capturing structure comprises at least two layers of hole plates. Each layer of hole plates is provided with a capturing hole. The size of the capturing hole on each layer of hole plates satisfies that the size of the capturing hole on the hole plate closer to the baffle is smaller.

[0032] The beneficial effect of the emergency gas blowdown system provided by the application is that by using the characteristics of the dead space, the capturing structure is arranged in the dead space. When the rupture disc just breaks, the pressure in the dead space is low, so the high-pressure gas can carry the fragments into the dead space. After the fragments are captured by the capturing structure, the pressure in the dead space has been increased, so it is difficult for the gas to flow through the fragments, thereby the influence of the fragments on the gas flow characteristics can be minimized, and subsequent design is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Structure diagram of a structure at a rupture disc in a gas emergency blow-off system; Figure 2 Sectional view diagram of a rupture disc recycling device; Figure 3 Structure diagram of a part of a rupture disc recycling device; Figure 4 Sectional view diagram of another rupture disc recycling device.

[0034] Explanation of reference signs: 1, high-pressure chamber; 2, rupture disc; 3, pipeline; 4-1, side plate; 4-2, outflow hole; 4-3, baffle; 4-4, capturing body; 4-5, capturing groove; 4-6, dead space; 4-7, orifice plate; 4-8, capturing hole. DETAILED DESCRIPTION

[0035] To solve the problems in the background art, the core inventive concept of the present application is to limit the fragments generated after the rupture of the rupture disc in the dead space, so as to avoid the subsequent fluid flowing through the fragments, thereby reducing the influence of the fragments on the fluid flow characteristics.

[0036] In the present application, the dead space refers to a flow channel with only one inlet and one outlet, and the fluid flowing into the dead space is not easy to flow out, so that the subsequent fluid is also not easy to flow into the dead space.

[0037] By utilizing the characteristics of the dead space, the capturing structure is arranged in the dead space. When the rupture disc just ruptures, the pressure in the dead space is low, so the high-pressure fluid can carry the fragments into the dead space. After the fragments are captured by the capturing structure, the pressure in the dead space has been raised, so it is difficult for the fluid to flow through the fragments, and therefore the influence of the fragments on the fluid flow characteristics can be reduced to the greatest extent, facilitating subsequent design.

[0038] It needs to be specially pointed out that the present application includes the following two core invention points: (1) the capturing structure is arranged in the dead space; (2) the capturing groove is utilized as a brand-new capturing structure to capture the fragments.

[0039] The present application will be further described in detail in combination with the embodiments.

[0040] The embodiments of the emergency gas blow-off system provided by the present application are as follows: As Figures 1-4As shown, the emergency gas blow-off system comprises a gas generator and a pipeline 3, the gas generator is provided with a high-pressure chamber 1 with a rupture disc 2, and the pipeline 3 is connected with the high-pressure chamber 1 and located downstream of the rupture disc 2. The pipeline 3 is provided with a rupture disc recovery device, which comprises a shell installed in the pipeline 3 and used for covering the rupture disc 2, and a capturing structure installed in the shell and used for capturing the fragments generated after the rupture disc 2 is broken, so that all the fragments can enter the shell and be captured by the capturing structure during use. The shell comprises a baffle 4-3 arranged opposite to the rupture disc 2 and a surrounding frame connected with the baffle 4-3 and the pipeline 3, the surrounding frame is provided with flow holes 4-2 communicating between the inside and outside of the surrounding frame, all the flow holes 4-2 on the side close to the baffle 4-3 form a dead space 4-6, and the capturing structure is arranged in the dead space 4-6; the capturing structure is made of a high-temperature-resistant material suitable for the gas generated by the gas generator.

[0041] The shell and the pipeline 3 are preferably detachably connected by means of bolts or the like. Those skilled in the art can understand that various detachable connection modes between the shell and the pipeline 3 can be achieved after knowing that the shell and the pipeline 3 are detachably connected, and thus the description is not repeated here. During the maintenance process after the emergency blow-off, the shell can be detached when the broken rupture disc 2 is replaced with a new rupture disc 2, so as to facilitate the cleaning of the rupture disc recovery device. Of course, the shell can also be non-detachably connected with the pipeline 3 by welding or the like, and at this time, the fragments can be taken out by using a magnet or tweezers or the like when the broken rupture disc 2 is replaced with a new rupture disc 2.

[0042] The core difference between the emergency gas blow-off system of the present application and the existing emergency gas blow-off system is that the rupture disc recovery device is additionally provided. Those skilled in the art can understand how to realize the remaining structures except the rupture disc recovery device, and thus the description is not repeated here. It needs to be specially pointed out that the high-pressure chamber 1 can be the high-pressure chamber 1 of the gas generator itself or the high-pressure chamber 1 connected with the gas generator, and both of them belong to the case that the gas generator is provided with the high-pressure chamber 1.

[0043] As shown in Figs. 1 and 2, Figure 2 and Figure 3 The surrounding frame can be surrounded by four side plates 4-1, and at this time, the surrounding frame is a rectangular surrounding frame. In other embodiments, the surrounding frame can also be a circular surrounding frame, a triangular surrounding frame, a hexagonal surrounding frame or a special-shaped surrounding frame, etc. In the present application, the shape of the surrounding frame is not limited, as long as it can ensure that all the gas sprayed from the gap generated after the rupture disc 2 is broken moves under the guidance of the surrounding frame, at this time, it can be ensured that all the fragments are blocked by the surrounding frame and reach the capturing structure, thereby avoiding that the fragments directly splash into the pipeline 3 and scratch the inner wall of the pipeline 3.

[0044] The use process of the emergency gas blow-off system of the present application is described below.

[0045] Firstly, fuel is combusted in the combustion chamber (which can form high pressure chamber 1) of the gas generator to generate high temperature and high pressure gas (temperature can reach thousands of degrees Celsius); after a very short time, rupture disc 2 breaks, and the gas flows into pipeline 3 through outflow hole 4-2; at the moment when rupture disc 2 just breaks, the pressure in dead space 4-6 is low, so the high pressure gas can carry the fragments into dead space 4-6; after the fragments are captured by the capturing structure, the pressure in dead space 4-6 has been raised, so it is difficult for the gas to flow through the fragments, thus the influence of the fragments on the flow characteristics of the gas can be minimized; then, the gas is delivered into the ballast tank. In the present application, the fragments are captured by the capturing structure (or trap), and are located in dead space 4-6 during the subsequent gas flow, so as to minimize the influence of the fragments on the flow characteristics of the gas, and make the flow characteristics of the gas controllable, which facilitates the design of the structure downstream of the rupture disc recovery device in the gas emergency blowdown system.

[0046] Exemplarily, two capturing structures are described below. After knowing the following two exemplary capturing structures, those skilled in the art can know that other capturing structures not described in detail in the present application can also be implemented.

[0047] The first capturing structure is shown in Figures 1-3 , which comprises a capturing groove 4-5 for capturing fragments, and the groove width of capturing groove 4-5 gradually decreases with the gradual decrease of the distance from baffle 4-3, i.e., in the y direction in Figure 1 , the closer to baffle 4-3, the smaller the groove width in the x direction. At this time, larger fragments will be captured by the positions with larger groove width of capturing groove 4-5, and smaller fragments will be captured by the positions with smaller groove width of capturing groove 4-5, so as to ensure that all fragments are captured by capturing groove 4-5. It needs to be specially pointed out that before being captured, smaller fragments can collide with the groove wall of capturing groove 4-5, and the groove wall of capturing groove 4-5 can guide the fragments to move to the narrower part of capturing groove 4-5, so that the fragments are better captured in capturing groove 4-5.

[0048] In use, the fragments will tightly adhere to the groove wall of capturing groove 4-5 and be stopped by the groove wall of capturing groove 4-5 under the action of self-weight and gas, so as to avoid the fragments from leaving the dead space.

[0049] Preferably, the extension direction (z direction perpendicular to x direction and y direction, not shown in Figure 1 ) of capturing groove 4-5 is perpendicular to the extension direction (x direction) of outflow hole 4-2, so as to reduce the possibility of fragments reaching outflow hole 4-2 during the movement of fragments along capturing groove 4-5 before being captured.

[0050] The second capturing structure is shown in Figures 1-3As shown, in an embodiment, the capturing groove 4-5 is a 'V' shaped groove, and the capturing groove 4-5 is formed by two surfaces of two adjacent triangular prism shaped capturing bodies 4-4.

[0051] In other embodiments, the capturing groove 4-5 can be a circular arc shaped groove or other shaped flared groove, so as to be able to capture debris of various sizes.

[0052] In other embodiments, the extending direction of the capturing groove 4-5 can also be parallel to the extending direction of the outflow hole 4-2.

[0053] The second capturing structure: as shown, Figure 4 The capturing structure includes at least two layers of hole plates 4-7 (the specific number can be two, three, four or more layers, which can be set as needed), and each layer of hole plates 4-7 is provided with a capturing hole 4-8, and the size of the capturing hole 4-8 on each layer of hole plates 4-7 meets: the smaller the size of the capturing hole 4-8 on the hole plate 4-7 closer to the baffle 4-3.

[0054] In use, the debris passes through the corresponding hole plate 4-7 through the capturing hole 4-8, and the smaller the debris, the more layers of hole plates 4-7 it passes through, thereby achieving the capture of the debris. In capturing, on the one hand, the debris needs to be 180° reversed to pass through the hole plate 4-7 again through the capturing hole 4-8, which is relatively difficult to occur in actual working conditions, so it can better capture the debris; on the other hand, the debris is in the dead space 4-6, and the gas is relatively difficult to provide the power for the debris to pass through the hole plate 4-7 in the opposite direction, so the capturing effect is good.

[0055] Embodiments of the rupture disc recovery device provided by the application: The rupture disc recovery device provided by the application can be any one of the rupture disc recovery devices used in the emergency gas blowing system of the application.

[0056] In addition, when the rupture disc recovery device provided by the application is applied to other scenarios, if the fluid is a non-high-temperature fluid, the capturing structure can be made of a non-high-temperature resistant material.

[0057] When the capturing structure does not need to be high-temperature resistant, the capturing body 4-4 in the first capturing structure can also be made of an elastic material such as rubber, so as to elastically clamp the debris by the capturing groove 4-5 formed by the two capturing bodies 4-4, thereby better capturing the debris.

[0058] When the capturing structure does not need to be high-temperature resistant, other capturing structures in addition to the two capturing structures given above can also be adopted, and the following describes two exemplary capturing structures added.

[0059] The third capturing structure: the capturing structure comprises a net for capturing the debris, a mounting plate with holes is mounted on the inner wall of the frame, and the net is mounted on the holes of the mounting plate. The net is woven by flexible and deformable wire, which can be understood by those skilled in the art according to the net used for fishing.

[0060] In use, the debris enters the net through the holes and hits the net, and the net is deformed by the impact to entangle the debris, so as to avoid the reverse movement of the debris and the exit of the net.

[0061] It should be specially noted that when the net is made of high-temperature-resistant material, it can also be applied in the emergency gas blowing system.

[0062] The fourth capturing structure: the capturing structure comprises a magnet for capturing the debris, and the magnet can be fixed on the baffle 4-3 by adhesion, clamping or the like.

[0063] In use, the debris is adsorbed by the magnet to avoid the reverse movement of the debris, so as to achieve the capturing of the debris.

[0064] It should be noted that the fluid in the present application can be gas or liquid.

[0065] Finally, it should be noted that the above only describes the preferred embodiments of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments without creative labor, or replace some technical features with equivalents, or organically combine different embodiments, so as to combine the embodiments given in the drawings. Of course, those skilled in the art can also combine the embodiments not given in the drawings. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rupture disc recovery device, characterized by, The shell is arranged in the pipeline downstream of the rupture disc and covers the rupture disc, and the capturing structure is arranged in the shell and is used to capture the fragments generated after the rupture disc is broken, so that all the fragments enter the shell and are captured by the capturing structure in use.

2. The burst disc recovery apparatus of claim 1, wherein, The capturing structure comprises a capturing groove for capturing the fragments, and the groove width of the capturing groove gradually decreases with the gradual decrease of the distance from the baffle.

3. The burst disc recovery apparatus of claim 2, wherein, The extending direction of the capturing groove is perpendicular to the extending direction of the outflow holes.

4. A burst disc recovery device as claimed in claim 2 or 3, wherein, The capturing groove is formed by two adjacent surfaces of two adjacent capturing bodies made of elastic material, so that the capturing groove formed by the two adjacent capturing bodies can capture the fragments.

5. The burst disc recovery apparatus of claim 1, wherein, The capturing structure comprises at least two layers of hole plates, each layer of hole plates is provided with capturing holes, and the size of the capturing holes on each layer of hole plates satisfies that the size of the capturing holes on the hole plate closer to the baffle is smaller.

6. The burst disc recovery apparatus of claim 1, wherein, The capturing structure comprises a net for capturing the fragments.

7. The burst disc recovery apparatus of claim 1, wherein, The capturing structure comprises a magnet for capturing the fragments.

8. The rupture disc recovery apparatus of any of claims 1-3, wherein, The capturing structure is made of high-temperature-resistant material to adapt to the high-temperature and high-pressure gas generated by the gas generator.

9. An emergency gas blowdown system comprising a gas generator configured with a high pressure chamber with a rupture disc and a conduit connected to the high pressure chamber downstream of the rupture disc, characterized in that, The pipeline is provided with a rupture disc recovery device, the rupture disc recovery device comprises a shell arranged in the pipeline and covering the rupture disc, and a capturing structure arranged in the shell and used to capture the fragments generated after the rupture disc is broken, so that all the fragments enter the shell and are captured by the capturing structure in use, the shell comprises a baffle arranged opposite to the rupture disc and a surrounding frame connecting the baffle and the pipeline, the surrounding frame is provided with outflow holes communicating inside and outside the surrounding frame, all the outflow holes form a dead space on the side close to the baffle, and the capturing structure is arranged in the dead space; and the capturing structure is made of high-temperature-resistant material to adapt to the gas generated by the gas generator.

10. The emergency gas purging system of claim 9, wherein, The capturing structure comprises a capturing groove for stopping the fragments, and the groove width of the capturing groove gradually decreases with the gradual decrease of the distance from the baffle.

11. The emergency gas purging system of claim 10, wherein, The extending direction of the capturing groove is perpendicular to the extending direction of the outflow holes.

12. An emergency gas purging system as claimed in claim 10 or 11, wherein, The capturing groove is a "V"-shaped groove, and the capturing groove is formed by two adjacent surfaces of two adjacent three-prism-shaped capturing bodies.

13. The emergency gas purging system of claim 9, wherein, The capturing structure comprises at least two layers of hole plates, each layer of hole plates is provided with capturing holes, and the size of the capturing holes on each layer of hole plates satisfies that the size of the capturing holes on the hole plate closer to the baffle is smaller.

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