Hydrogen venting system

Abstract

The application discloses a hydrogen venting system to solve the technical problems of large size, high cost, easy blockage and difficult maintenance of the flame arrester in the prior art. The hydrogen venting system comprises a water seal tank, a venting cylinder and an automatic control system. The water seal tank is a vertical cylindrical body. The venting cylinder is integrally designed with the water seal tank. The water seal tank comprises a tank body, a demister and a vertical partition plate. The partition plate and the demister are arranged in the tank body. The demister is arranged on the upper portion of the partition plate. The partition plate separates the interior of the tank body into two independent chambers, namely a water seal chamber and a venting chamber. The venting cylinder is arranged in the interior of the venting chamber. The venting cylinder is arranged in a range of 200 mm below the bottom edge of the demister and 200 mm above the bottom of the water seal tank. The automatic control system comprises a pressure monitoring system, a liquid level monitoring system, a gas phase temperature monitoring system, a liquid phase temperature monitoring system and an interlocked water supply system. The pressure monitoring system and the gas phase temperature monitoring system are arranged on the side wall of the gas phase portion of the upper portion of the water seal tank. The liquid level monitoring system and the liquid phase temperature monitoring system are arranged on the side wall of the liquid phase portion of the lower portion of the water seal tank. The interlocked water supply system is arranged at the water supply opening.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydrogen storage and safe release in application scenarios, in particular to a hydrogen release system. BACKGROUND

[0002] Hydrogen energy is a secondary energy and also a clean energy carrier. Under the background of "double carbon", the fields of hydrogen production, storage and application are developing rapidly. Application scenarios include hydrogen production plants, hydrogen storage tank areas, hydrogen refueling mother stations, hydrogen refueling stations, and fuel cell vehicle test stations. In the above-mentioned application scenarios, the gas discharged during equipment and pipeline overpressure and purging is often discharged on site or discharged into a flare release system according to the application scenario, utility conditions and the nature of the discharged gas.

[0003] The discharged gas during equipment and pipeline overpressure is hydrogen, which has a high gas purity and a specific gravity higher than that of air. When air is mixed into the release system and encounters an open flame, deflagration or detonation may occur. Therefore, facilities that prevent air from entering and have a fireproof effect need to be installed in the hydrogen release system.

[0004] The prior art uses a small flow of inert gas to continuously inject the release system, which can maintain a slight positive pressure in the system and prevent air backflow. However, long-term continuous operation requires a large amount of gas, which is costly. The prior art uses a flame arrestor, which can effectively prevent backfire. However, as the scale of hydrogen application increases, the amount of discharge increases, and the cost of installing a flame arrestor on a large-diameter discharge pipeline is high, making it difficult to maintain and affecting normal operation. Moreover, the end of the discharge pipeline is directly connected to the atmosphere, and dust and debris in the air can easily enter the discharge pipeline over time, causing the flame arrestor to be easily blocked. The prior art uses long-flow water and overflow to maintain the liquid level of the water seal tank, but long-term continuous operation requires a large amount of water, and an underground overflow pipe is required, which is complex to construct. During normal production, frequent and small amounts of discharge can carry a large amount of liquid droplets, resulting in water waste.

[0005] Chinese patent CN202121717984.7 discloses a hydrogen refueling station release system based on a nitrogen charging process, which includes a hydrogen refueling station release system pipeline and a hydrogen release pipe, and also includes a nitrogen charging pipeline that is in communication with the output end of the hydrogen refueling station release system pipeline for outputting nitrogen into the hydrogen refueling station release system pipeline. This technology uses nitrogen to purge and replace the release pipeline and release pipe, reducing the air content in the release system. However, continuous nitrogen supply consumes a large amount of nitrogen, which is not economical. Intermittent nitrogen supply also causes nitrogen to be diluted over time, making it impossible to monitor the nitrogen concentration in real time and determine whether the air content has been effectively reduced.

[0006] Chinese patent CN202121861936.5 discloses a fuel cell vehicle hydrogen refueling station hydrogen release device, mainly aiming at the hydrogen release device, i.e. the release device of the release pipe structure, adopts a flame arrester fire retardant scheme, the vent top adopts a horn type vent type, the vent opening is open to the air, and a tear hole, pipe bottom sewage way is used to discharge rainwater, but the tear hole of the technology is easy to block after long-term use, and the delayed drainage will cause the vent system to be blocked.

[0007] Chinese patent CN202220080786.2 discloses a hydrogen safety venting device, which adopts a flame arrester fire retardant scheme, the gas outlet of the hydrogen venting system is communicated with the gas inlet of the hydrogen buffer tank through a hydrogen pipeline, the gas outlet of the hydrogen buffer tank is communicated with the gas outlet of the carbon dioxide pipeline and the gas inlet of the venting pipeline, a first program control valve is arranged on the gas inlet side of the hydrogen buffer tank, a second program control valve is arranged on the carbon dioxide pipeline, the gas inlet of the carbon dioxide pipeline is communicated with the gas outlet of the carbon dioxide cylinder, the gas outlet end of the venting pipeline is provided with a flame arrester, the oxygen concentration detector and the hydrogen concentration detector are arranged on the venting pipeline, the oxygen concentration detector is used to detect the concentration of oxygen in the gas in the venting pipeline, and the hydrogen concentration detector is used to detect the concentration of hydrogen in the gas in the venting pipeline. The technology solves the problem of frequent deflagration or fire accidents during hydrogen safety venting of the existing device, but dust and sundries in the air are easy to enter the venting pipeline during long-term use, and the flame arrester is easy to be blocked. SUMMARY

[0008] The purpose of the present application is to provide a hydrogen venting system to solve the technical problems of large size, high cost, easy blockage and difficult maintenance of the flame arrester in the prior art, and to solve the problem of large consumption of nitrogen and water caused by continuous injection of nitrogen and water in the prior art.

[0009] The hydrogen venting system provided by the present application has the following technical scheme.

[0010] A hydrogen venting system characterized in that the hydrogen venting system comprises a water seal tank, a venting cylinder and an automatic control system, the water seal tank is a vertical cylinder, the venting cylinder is integrally designed with the water seal tank, the water seal tank comprises a tank body, a demister and a vertical partition plate, the partition plate and the demister are arranged in the tank body, the partition plate separates the inside of the tank body into two independent chambers, namely a water seal chamber and a venting chamber, the demister is arranged on the upper part of the partition plate, the bottom of the venting cylinder is deep into the inside of the venting chamber, the upper part of the water seal chamber is provided with a vent gas inlet, the vent gas inlet is connected with a vent gas inlet pipeline, the lower part of the tank body is provided with a water replenishing port, the top of the water seal chamber is provided with a gas phase temperature monitoring port, a water seal chamber pressure monitoring port and a nitrogen injection port, the bottom of the water seal chamber is provided with a drainage port, and the tank wall of the water seal chamber is provided with a liquid level meter port; the top of the venting cylinder is provided with a venting top pipe, the bottom of the venting cylinder is deep into the inside of the venting chamber, is arranged in a range of 200 mm below the bottom edge of the demister and 200 mm above the bottom of the water seal tank; the top of the venting chamber is provided with a venting chamber pressure monitoring port, and the bottom of the venting chamber is provided with a blowdown port; the automatic control system comprises a pressure monitoring system, a liquid level monitoring system, a gas phase temperature monitoring system, a liquid phase temperature monitoring system and an interlocked water replenishing system, the pressure monitoring system and the gas phase temperature monitoring system are arranged on the side wall of the gas phase part of the upper part of the water seal tank, the liquid level monitoring system and the liquid phase temperature monitoring system are arranged on the side wall of the liquid phase part of the lower part of the water seal tank, and the interlocked water replenishing system is arranged at the water replenishing port.

[0011] The water seal tank is a vertical cylinder with a flat plate head.

[0012] The vent gas inlet pipeline is horizontally connected into the water seal tank, and after the pipeline direction is changed by a 90° elbow, a vertical pipe is used to extend downward below the water surface of the water seal water by 100-300 mm.

[0013] The pressure monitoring port and the nitrogen injection port are arranged on the flat plate head above the water seal chamber.

[0014] The partition plate is a vertical double-layer structure partition plate, and the spacing between the double-layer structure partition plates is consistent with the thickness of the demister.

[0015] The top of the demister is flush with the inside of the flat plate head at the top of the water seal tank, and is fixed on the partition plate by bolts around.

[0016] The demister is composed of a plurality of mesh blocks and an external support frame, wherein the plurality of mesh blocks are a plurality of square wire mesh structures staggered and overlapped, the thickness is 150-300 mm, the plurality of mesh blocks are fixed by the external support frame, the external support frame is integrally welded, the external support frame is welded on the inner wall of the tank body by support rib plates, and the effective gas passing capacity of the demister is greater than or equal to the gas passing capacity of the venting pipeline.

[0017] The venting cylinder is a vertical standpipe structure, and the inner diameter of the venting cylinder is equal to the inner diameter of the vent inlet pipe.

[0018] The venting top pipe is composed of an equal-diameter tee, two venting branch pipes and two support beams, the venting branch pipes are equal in diameter to the venting cylinder, the branch interfaces of the equal-diameter tee are connected to the venting cylinder, preferably by welding, the horizontal end interfaces on both sides of the equal-diameter tee are connected to the venting branch pipes, preferably by welding, the venting branch pipes are arranged obliquely downward, preferably by oblique welding, the included angle alpha between the venting branch pipes and the horizontal direction is 8-18°, the venting branch pipe outlets on the outer side of the venting branch pipes are obliquely cut along the horizontal direction, the cutouts are upward, the oblique cutting angle beta is 40-60°, one end of the support beam is connected to the venting cylinder, preferably by welding, the other end of the support beam is connected to the venting branch pipe, preferably by welding, and the included angle gamma between the support beam and the vertical direction is 30-60°.

[0019] The water seal tank is provided with a support leg, and the support leg is preferably fixed on the concrete foundation by anchor bolts.

[0020] The hydrogen venting system can be used in a safe venting place for hydrogen storage and application, and is mainly used in hydrogen filling stations and hydrogen filling parent stations.

[0021] Compared with the prior art, the hydrogen venting system has the following advantages: the water seal fire blocking is used instead of the fire blocking device, nitrogen and water are not continuously supplied, the system is more suitable for large-scale hydrogen energy scenes, and the problems of installation difficulty and high cost caused by the large size of the fire blocking device are avoided; the water seal tank and the venting cylinder are combined to reasonably utilize the vertical space while meeting the height requirement of venting; the demister is used to remove water droplets carried by the venting gas, thereby saving water; the nitrogen is intermittently replaced to avoid the mixing of air into the water seal tank and the venting cylinder, thereby improving safety; the water seal cavity, the venting cavity and the extending venting cylinder are independently arranged, dust and sundries possibly mixed from the outside are collected to the bottom of the venting cavity through the vertical venting cylinder, the demister is prevented from being blocked by the outside influence and affecting venting, the venting gas enters the venting cavity through the demister and is further separated from sewage under the action of gravity, liquid droplets are prevented from being discharged from the venting cylinder along with the gas and affecting surrounding facilities, the water seal tank is separated into two chambers by the partition plate, only half of the space is occupied while meeting the height requirement of water seal, and the water consumption of water seal is saved; the flat head is used to facilitate the disassembly and maintenance of the demister; the tank body is provided with a temperature control heating measure to prevent freezing of water in winter; pressure monitoring instruments are arranged on the top of the water seal cavity and the venting cavity, nitrogen is continuously injected into the water seal tank during inspection, and whether the demister is blocked is determined by the pressure difference between the two chambers.

[0022] The application will be further described in detail below with reference to the drawings and specific embodiments, but the scope of the application is not limited thereto. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a flow schematic diagram of a hydrogen venting system of the present application;

[0024] Figure 2 is a structural schematic diagram of a water seal tank and a venting cylinder of the present application;

[0025] Figure 3 is a structural schematic diagram of a venting overhead pipe of the present application;

[0026] Figure 4 is a structural schematic diagram of a demister of the present application;

[0027] The reference signs shown in the drawings are as follows:

[0028] 1 - water seal tank, 2 - vent gas inlet pipeline, 3 - nitrogen replacement pipeline, 4 - water supplement pipeline, 5 - venting cylinder pipeline, 6 - venting cavity blowdown pipeline, 7 - water seal cavity drainage pipeline, 8 - water seal cavity pressure monitoring instrument, 9 - gas phase temperature monitoring instrument, 10 - venting cavity pressure monitoring instrument, 11 - liquid level monitoring instrument, 12 - water seal water supplement control valve, 13 - liquid phase temperature monitoring instrument, 101 - water seal cavity, 102 - demister, 103 - partition, 104 - venting cavity, 105 - leg, 106 - flat plate head, 107 - venting cylinder, 108 - venting overhead pipe, 109 - vent gas inlet, 110 - liquid level gauge port, 111 - liquid level gauge port, 112 - water supplement port, 113 - drainage port, 114 - blowdown port, 115 - nitrogen replacement port, 116 - water seal cavity pressure monitoring port, 117 - venting cavity pressure monitoring port, 118 - liquid phase temperature monitoring port, 119 - heat tracing facility, 120 - gas phase temperature monitoring port; 201 - equal-diameter tee, 202 - venting branch pipe, 203 - support beam, 301 - external support frame, 302 - multi-layer mesh block. DETAILED DESCRIPTION

[0029] The present application will be further described below in conjunction with the drawings.

[0030] As Figure 1 and Figure 2As shown, in a hydrogen venting system of the present invention, the venting air enters the water seal cavity 101 below the water seal liquid level through the venting air inlet pipe 2 and the venting air inlet 109. After passing through the water seal, the venting air enters the gas phase space above the water seal cavity 101. Then, after the venting air passes through the demister 102 to remove water droplets, it enters the venting cavity 104, and then enters the venting cylinder 107 inside the venting cavity 104. It flows upward along the venting cylinder pipe 5 and is finally discharged through the venting top pipe 108. The water for the water seal is supplied by the self-replenishing water pipe 4, which enters the water seal cavity 101 through the water inlet 112 at the bottom of the water seal cavity 101. When the liquid level monitoring instrument 11 detects that the liquid level in the water seal cavity 101 reaches the designed high liquid level, the water seal water replenishment control valve 12 is closed. When the liquid level monitoring instrument 11 detects that the liquid level in the water seal cavity 101 reaches the designed low liquid level, the water seal water replenishment control valve 12 is opened. When the liquid phase temperature monitoring instrument 13 detects that the liquid phase temperature inside the water seal cavity 101 is below 5℃, the heating system 119 is activated to prevent the liquid phase inside the water seal cavity 101 from freezing. The gas phase temperature monitoring instrument 9 of the water seal cavity 101 is used to observe the gas phase temperature inside the cavity during routine inspections. After each venting, the nitrogen gas used to replace the hydrogen enters the gas phase space above the water seal cavity 101 from the nitrogen replacement pipe 3 through the nitrogen replacement port 115 on the flat end cap 106 above the water seal cavity 101, replacing the hydrogen gas inside the entire water seal tank 1 and the venting cylinder 107. The water seal cavity pressure monitoring instrument 8 is installed on the water seal cavity pressure monitoring port 116 at the top of the water seal cavity 101, and the venting cavity pressure monitoring instrument 10 is installed on the venting cavity pressure monitoring port 117 at the top of the venting cavity 104. When checking for blockage in the demister 102, nitrogen gas enters the water seal chamber 101 from the nitrogen replacement pipe 3 through the nitrogen replacement port 115 on the flat end cap 106 above the water seal chamber 101, then passes through the demister 102 and enters the vent chamber 104. The blockage is determined by observing the pressure difference between the water seal chamber pressure monitoring instrument 8 and the vent chamber pressure monitoring instrument 10. When the water seal tank 1 is under maintenance, the wastewater inside the vent chamber 104 is discharged through the drain port 114 at the bottom of the vent chamber 104 and the vent chamber drain pipe 6.

[0031] The heat tracing facility 119 installed on the outer wall of the tank body 101 of the water seal tank 1 can be equipped with heat tracing pipes or heat tracing tapes according to the climate conditions of the place of use. When the extreme minimum temperature of the place of use is greater than 0℃, the heat tracing tapes or heat tracing pipes may not be installed. Under normal circumstances, when the liquid phase temperature inside the water seal tank 1 is lower than 5℃, the heat tracing pipes or heat tracing tapes are turned on to prevent the liquid phase inside the tank from freezing.

[0032] like Figure 2 As shown, the water seal tank 1 of the present invention is supported by a support leg 105, which is preferably fixed to the concrete foundation by anchor bolts.

[0033] The water seal tank 1 is a flat head straight cylinder, mainly comprising a tank body and a demister 102, the tank body is separated into two independent chambers by a vertical partition plate 103, namely a water seal chamber 101 and a venting chamber 104, the demister 102 is arranged on the upper part of the partition plate 103, and the water seal chamber 101 and the venting chamber 104 are communicated through the demister 102.

[0034] The partition plate 103 is preferably a vertical double-layer structure partition plate, and the interval between the double-layer structure partition plates is consistent with the thickness of the demister 102.

[0035] The top of the demister is preferably flush with the inner side of the flat head of the water seal tank, and is fixed on the partition plate by bolts.

[0036] The demister 102 is composed of a plurality of mesh blocks 302 and an external support frame 301, wherein the plurality of mesh blocks 302 are a plurality of square wire mesh structures staggered and overlapped, the thickness is 150-300 mm, the plurality of mesh blocks 302 are fixed by the external support frame 301, the external support frame 301 is integrally welded, the external support frame 301 is welded on the inner wall of the tank body by support rib plates, and the effective gas passing capacity of the demister 102 is greater than or equal to the gas passing capacity of the venting pipeline.

[0037] The venting cylinder 107 is a vertical standpipe structure, and the inner diameter thereof is preferably equal to the inner diameter of the vent gas inlet pipe 2. The top of the venting cylinder 107 is a venting top pipe 108, and the venting top pipe 108 is perpendicular to the venting cylinder 107.

[0038] As shown in Figures 2-3 The venting cylinder 107 is supported by beam welding after extending into the venting chamber 104, and the bottom height of the venting cylinder 107 is lower than the bottom height of the demister 102. The venting top pipe 108 at the top of the venting cylinder 107 is composed of an equal-diameter tee joint 201, two venting branch pipes 202 and two support beams 203. The venting branch pipes 202 are equal in diameter to the venting cylinder 107, the branch section interfaces of the equal-diameter tee joint 201 are welded and connected with the venting cylinder 107, the horizontal end interfaces on both sides of the equal-diameter tee joint 201 are welded and connected with the venting branch pipes 202, one end of the support beam is welded and connected with the venting cylinder 107, and the other end is welded and connected with the venting branch pipes 202. The venting branch pipes 202 are welded obliquely downward, and the included angle a between the venting branch pipes 202 and the horizontal direction is 8°, the outer side pipe openings of the venting branch pipes 202 are obliquely cut along the horizontal direction, the cut openings are upward, the oblique cutting angle β is 60°, and the included angle γ between the support beam and the vertical direction is 45°.

[0039] The vent branch pipe 202 is welded obliquely downward, and the outer port of the vent branch pipe 202 is obliquely cut in the horizontal direction, the cut is upward, on the basis of ensuring the upward diffusion of gas, rainwater is avoided from entering, and a bird-proof net is arranged at the port of the vent branch pipe 202. The vent cylinder 107 and the water seal tank 1 are preferably designed in an integrated manner, the upper tank body in the water seal cavity 101 is provided with a vent gas inlet 109, the vent gas inlet 109 is connected with a vent gas inlet pipeline 2, the lower tank body in the water seal cavity 101 is provided with a water supplement port 112 and a liquid phase temperature monitoring port 118, the water supplement port 112 is connected with a water supplement pipeline 4, the water supplement pipeline 4 is provided with a water seal water supplement control valve 12, the liquid phase temperature monitoring port 118 is connected with a liquid phase temperature monitoring instrument 13, the top of the water seal cavity 101 is provided with a gas phase temperature monitoring port 120, a water seal cavity pressure monitoring port 116 and a nitrogen injection port 115, the gas phase temperature monitoring port 120 is connected with a gas phase temperature monitoring instrument 9, the water seal cavity pressure monitoring port 116 is connected with a water seal cavity pressure monitoring instrument 8, the nitrogen injection port is connected with a nitrogen replacement pipeline 3, the bottom of the water seal cavity 101 is provided with a drainage port 113, the drainage port 113 is connected with a water seal cavity drainage pipeline 7, the tank wall of the water seal cavity 101 is provided with liquid level gauge ports 110 and 111, and is connected with a liquid level monitoring instrument 11, the middle partition plate 103 of the tank body of the water seal tank 1 is provided with a demister 102 at the upper portion, the top of the vent cavity 104 is provided with a vent gas outlet, the vent gas outlet is connected with the vent cylinder 107, the bottom of the vent cylinder 107 is deeply arranged in the vent cavity 104 and is lower than the bottom edge of the demister 102 by 200 mm. The top of the vent cavity 104 is provided with a vent cavity pressure monitoring port 117, which is connected with a vent cavity pressure monitoring instrument 10, and the bottom of the vent cavity 104 is provided with a blowdown port 114, which is connected with a vent cavity blowdown pipeline 6. The automatic control system comprises a pressure monitoring system, a liquid level monitoring system, a gas phase temperature monitoring system, a liquid phase temperature monitoring system, an interlocked water supplement system and a heat tracing control system, the pressure monitoring system and the gas phase temperature monitoring system are arranged on the side wall of the upper gas phase part of the tank body of the water seal cavity, the liquid level monitoring system and the liquid phase temperature monitoring system are arranged on the side wall of the lower liquid phase part of the tank body of the water seal cavity, the interlocked water supplement system is arranged at the water supplement port, and the heat tracing control system is arranged on the outer wall of the tank body of the water seal cavity.

[0040] The air vent 109 of this invention is radially installed on the upper part of the water seal cavity 101 tank wall, extending into the water seal cavity 101 and then bent downwards at a 90° angle, extending 200mm from the bottom of the water seal cavity 101. The level gauge port 110 is radially installed on the upper part of the water seal cavity 101 tank wall, installed at the designed high water seal level. The level gauge port 111 is radially installed on the upper part of the water seal cavity 101 tank wall, installed at the designed low water seal level. The water inlet 112 is radially installed on the lower part of the water seal cavity 101 tank wall, installed 200mm above the bottom of the water seal cavity 101. The water seal cavity drain port 113 is vertically installed downwards at the bottom of the water seal cavity. The nitrogen purging port 115 and the water seal cavity pressure monitoring port 116 are located above the flat end cap 106 on the side of the water seal cavity 101. The liquid phase temperature monitoring port 118 is located below the side wall of the water seal cavity 101, installed radially. The vent cavity pressure monitoring port 117 is used to compare with the water seal cavity pressure monitoring port 116. The pressure difference measured by the vent cavity pressure monitoring port 117 and the water seal cavity pressure monitoring port 116 is used to observe whether the demister is blocked. The vent cavity pressure monitoring port 11 is located above the flat end cap 106 on the side of the vent cavity 104 and is installed vertically upward. The bottom of the vent cavity 104 of the water seal tank 1 is provided with a vent cavity drain port 114, which is installed vertically downward.

[0041] like Figure 2 , Figure 4 As shown, the demister 102 is installed above the partition 103 and vertically below the flat end cap 106, supported by the partition 103. The demister 102 consists of an external support frame 301 and multiple layers of mesh blocks 302.

Claims

1. A hydrogen venting system, characterized by: The hydrogen venting system includes a water-sealed tank, a venting cylinder, and an automatic control system. The water-sealed tank is a vertical cylindrical body, and the venting cylinder and water-sealed tank are integrated into one unit. The water-sealed tank includes a tank body, a demister, and a vertically arranged baffle. The baffle and demister are located inside the tank body, and the baffle separates the interior of the tank body into two independent chambers: a water-sealed chamber and a venting chamber. The demister is located on the upper part of the baffle. The bottom of the venting cylinder extends into the venting chamber. The upper part of the tank body in the water-sealed chamber has a venting inlet connected to a venting inlet pipe. The lower part of the tank body has a water inlet. The top of the water-sealed chamber has a water-sealed chamber pressure monitoring port and a nitrogen injection port. The bottom of the water-sealed chamber has a drain port. The tank wall of the water-sealed chamber is lined with liquid... The venting cylinder has a venting top pipe at the top and its bottom extends into the venting cavity, positioned 200mm below the bottom edge of the demister and 200mm above the bottom of the water seal tank. The venting cavity has a pressure monitoring port at the top and a drain port at the bottom. The automatic control system includes a pressure monitoring system, a liquid level monitoring system, a vapor phase temperature monitoring system, a liquid phase temperature monitoring system, and an interlocked water replenishment system. The pressure monitoring system and vapor phase temperature monitoring system are located on the side wall of the upper vapor phase section of the water seal tank, the liquid level monitoring system and liquid phase temperature monitoring system are located on the side wall of the lower liquid phase section of the water seal tank, and the interlocked water replenishment system is located at the water replenishment port. The air release inlet pipe is horizontally connected to the water seal tank, and after changing the pipe direction with a 90° elbow, a vertical pipe is used to extend downwards 100-300mm below the water seal liquid surface. The top of the demister is flush with the inner side of the flat end cap at the top of the water seal tank, and is fixed to the partition plate with bolts around it. The demister consists of multiple layers of mesh blocks and an external support frame. The multiple layers of mesh blocks are multiple layers of overlapping square wire mesh structures with a thickness of 150-300 mm. The multiple layers of mesh blocks are fixed by an external support frame. The external support frame is integrally welded and welded to the inner wall of the tank using support ribs. The venting cylinder is a vertical pipe structure with an inner diameter equal to the inner diameter of the venting inlet pipe. A venting top pipe is installed at the top of the venting cylinder, and the venting top pipe is perpendicular to the venting cylinder. The venting jacking pipe consists of an equal-diameter tee, two venting branch pipes, and two support beams. The venting branch pipes have the same diameter as the venting cylinder. The branch section interface of the equal-diameter tee is connected to the venting cylinder. The horizontal end interfaces on both sides of the equal-diameter tee are connected to the venting branch pipes respectively. The venting branch pipes are set obliquely downwards, with an angle α of 8 to 18° with the horizontal direction. The venting pipe opening on the outer side of the venting branch pipe is obliquely cut along the horizontal direction, with the cut facing upwards and an oblique angle β of 40 to 60°. One end of the support beam is connected to the venting cylinder, and the other end is connected to the venting branch pipe. The angle γ between the support beam and the vertical direction is 30 to 60°. After each emptying, the nitrogen gas for replacing hydrogen is from the nitrogen replacement pipeline, enters the gas phase space of the upper part of the water seal cavity through the nitrogen replacement port on the flat head above the water seal cavity, replaces the hydrogen in the whole water seal tank and the emptying cylinder, the water seal cavity pressure monitoring instrument is installed on the water seal cavity pressure monitoring port on the top of the water seal cavity, the emptying cavity pressure monitoring instrument is installed on the emptying cavity pressure monitoring port on the top of the emptying cavity, when detecting whether the demister is blocked, the nitrogen gas from the nitrogen replacement pipeline enters the water seal cavity through the nitrogen replacement port on the flat head above the water seal cavity, enters the emptying cavity through the demister, and whether the demister is blocked is judged by observing the pressure difference between the water seal cavity pressure monitoring instrument and the emptying cavity pressure monitoring instrument.

2. The hydrogen venting system of claim 1, wherein: The water seal tank is a vertical cylindrical body with a flat head.

3. The hydrogen venting system of claim 1, wherein: The partition plate is a vertical double-layer structure partition plate, and the interval between the double-layer structure partition plates is consistent with the thickness of the demister.

4. The hydrogen venting system of claim 1, wherein: A bird protection net is arranged at the pipe opening of the emptying branch pipe.

5. The hydrogen venting system of claim 1, wherein: The lower part of the water seal tank is provided with a support leg, and the support leg is fixed on the concrete foundation by anchor bolts.

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