Oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator

Abstract

The purpose of this invention is to propose an oxygen depressurization explosion-proof electrostatic vacuum noise silencing device, belonging to the field of safe handling of flammable and explosive industrial gases. The device includes a vertical cylindrical body, a bottom air inlet, a top exhaust outlet, supporting legs, and inside the cylinder, a bottom flame arrester, a multi-stage pressure reduction and deceleration assembly, an electrostatic elimination sound-absorbing layer, and a top flame arrester. Through multi-stage U-shaped microporous baffles, progressive pressure reduction and deceleration are achieved; the metal wire sound-absorbing layer eliminates static electricity and absorbs noise; and the upper and lower double-layer flame arresters block the backfire path, completely solving the problems of electrostatic explosion, backfire, and noise pollution during oxygen depressurization. This invention is suitable for high-risk scenarios such as liquid oxygen stations, ensuring the safe production of flammable and explosive chemical facilities, avoiding personal injury and property damage, while meeting environmental protection and noise reduction requirements.

Description

Technical Field

[0001] This invention relates to the field of flammable and explosive industrial gas safety treatment equipment, and is particularly applicable to the scenario of pressure relief and discharge of liquid oxygen station storage tanks, specifically an oxygen pressure relief explosion-proof electrostatic vacuum noise silencing device. Background Technology

[0002] During the pressurization and replenishment of liquid oxygen in large storage tanks at liquid oxygen stations, when the liquid level in the storage tank drops to 3 tons, liquid oxygen needs to be added via a liquid oxygen tanker. During this process, the pressure inside the storage tank needs to be depressurized until the pressure difference between the tanker and the tanker is 0.4 MPa before the addition can be carried out. The depressurized oxygen is then directly released into the atmosphere.

[0003] In existing technologies, oxygen pressure relief pipes mostly use straight-through or simple silencers, which have the following drawbacks: High-speed oxygen friction inside the tube can easily generate static electricity accumulation, which can trigger electrostatic discharge, combustion, and explosion. The risk of backfire is high, and the flame can easily spread along the pipeline to the liquid oxygen storage tank, causing a catastrophic accident; The noise pollution is severe and fails to meet industrial environmental protection standards; Traditional silencers have a simple structure and cannot simultaneously achieve the synergistic effects of pressure reduction, flame arrest, static electricity elimination, and vacuum noise reduction. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator. Through an integrated structure of multi-stage pressure reduction and deceleration, stacked flame arrestor, metal wire electrostatic elimination, and microporous sound absorption, it achieves safe oxygen pressure relief and discharge, completely eliminating the risk of electrostatic explosion and backfire. At the same time, the vertical cylindrical interlayer vacuum pump meets the noise reduction requirement of more than 60dB, ensuring the safe production of flammable and explosive chemical facilities.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: an oxygen pressure relief explosion-proof electrostatic vacuum noise silencing device, comprising a vertical cylindrical body, a bottom air inlet, a top exhaust outlet, supporting legs, and a multi-stage treatment assembly disposed inside the body. The bottom air inlet is connected to the pressure relief pipe of the liquid oxygen station storage tank through a DN40 stainless steel seamless pipe, and the top exhaust outlet is connected to a 5-meter high exhaust pipe through a DN40 stainless steel seamless pipe. The supporting legs are symmetrically distributed at the bottom of the body to stably support the entire device.

[0006] Furthermore, the interior of the cylinder is provided with a bottom flame arrester, a multi-stage pressure reduction and deceleration assembly, an electrostatic elimination and sound absorption layer, and a top flame arrester from bottom to top. Both the bottom and top flame arresters are made of multiple layers of stainless steel metal mesh plates stacked together. The mesh plate thickness is 0.6-1.0 mm and the mesh density is 180-220 mesh, which is used to block the flame propagation path in both directions.

[0007] Furthermore, the multi-stage pressure reduction and deceleration assembly consists of four sets of streamlined U-shaped stainless steel wire microporous baffles stacked alternately along the axial direction of the cylinder. The vertical spacing between each set of baffles is 180-220mm, and the surface of the baffles is densely covered with micropores with a diameter of 0.5-1.0mm, with an opening rate of 40%-50%. This allows the airflow to fold and expand multiple times within the cylinder, achieving step-by-step pressure reduction and deceleration.

[0008] Furthermore, the bending radius of the U-shaped baffle is 1 / 3 to 1 / 2 of the inner diameter of the cylinder. The two ends of the baffle are welded and fixed to the inner wall of the cylinder to form a closed airflow reversal channel, which avoids airflow short circuit and ensures that the depressurization and speed reduction effect of each stage is sufficient.

[0009] Furthermore, the electrostatic elimination sound-absorbing layer is laid on the inner wall of the cylinder, located between the multi-stage voltage reduction and deceleration assembly and the top flame arrester. The electrostatic elimination sound-absorbing layer is made of 304 stainless steel wires with a diameter of 0.08-0.12mm interwoven together, with a thickness of 610mm. The wires are reliably welded to the cylinder and grounded, used to eliminate static electricity carried by the airflow and absorb noise.

[0010] Furthermore, the interwoven metal wire structure of the electrostatic sound-absorbing layer forms a three-dimensional porous channel with a porosity of 70%-80%, which can simultaneously absorb mid-to-high frequency noise. Combined with the throttling and noise reduction of the multi-stage voltage reduction and deceleration component 6, the overall noise reduction reaches below 60dB.

[0011] Furthermore, the bottom flame arrester has a thickness of 70-90mm, and the top flame arrester has a thickness of 100-120mm. The top flame arrester is thicker than the bottom flame arrester to enhance its ability to block backfire on the exhaust side and further improve safety redundancy.

[0012] Furthermore, the inner diameter of the cylinder is 320-330mm, the total height is 1850-1900mm, the effective processing section height is 1050-1150mm, and the height of the bottom support bracket is 550-650mm, ensuring that the device has a compact structure and sufficient airflow processing time.

[0013] Furthermore, both the bottom air inlet and the top exhaust outlet adopt a flange connection structure. The flange specifications are matched with DN40 stainless steel seamless pipes. Static electricity jumper wires are set at the connection to ensure that the entire device is grounded and conductive, eliminating the risk of static electricity accumulation.

[0014] Furthermore, the vertical cylindrical body has a vacuum chamber inside and a vacuum valve installed on the outside of the vertical cylindrical body. The vacuum chamber can play the role of heat insulation, sound insulation and noise reduction.

[0015] Furthermore, the device is suitable for liquid oxygen station storage tank depressurization scenarios. When the pressure inside the storage tank is 1.3 MPa and the pressure in the tank truck is 0.6 MPa, and the pressure difference drops to 0.4 MPa, the depressurized oxygen, after being processed by the device, has an outlet pressure below 0.1 MPa, an electrostatic elimination rate of ≥99%, and noise reduced to below 60 dB, achieving safe and environmentally friendly oxygen emission.

[0016] This invention provides an oxygen pressure relief explosion-proof electrostatic vacuum noise silencing device, which has the following beneficial effects: (1) Complete static electricity elimination mechanism: The 304 stainless steel metal wire sound-absorbing layer laid on the inner wall of the cylinder is reliably welded to the cylinder and grounded. The conductive network formed by the interwoven metal wires can discharge the static electricity generated by the friction of high-speed airflow in real time. The static electricity elimination rate is ≥99%, which avoids combustion and explosion caused by static discharge from the root. Compared with the traditional insulating material silencer, the present invention completely eliminates the physical basis of static electricity accumulation and solves the core safety hazard in the high-risk scenario of liquid oxygen station; Bi-directional fire arrestor redundancy design: The bottom and top of the device are respectively set with stainless steel metal mesh plates stacked with flame arresters of different thicknesses. The bottom flame arrester (70-90mm thick) blocks the backfire from the storage tank side, and the top flame arrester (100-120mm thick) blocks the backfire from the atmosphere side. The double-layer structure forms a "front and rear attack" flame blocking path. The mesh plate adopts a high-density design of 180-220 mesh, which can effectively quench flames and block flame propagation channels, completely preventing backfire from spreading to the liquid oxygen storage tank and causing catastrophic accidents. A step-by-step pressure reduction and deceleration buffer: four sets of streamlined U-shaped stainless steel wire microporous baffles are alternately stacked along the axial direction, causing high-speed oxygen to expand and deflect multiple times within the cylinder. The airflow velocity gradually decreases from the initial high speed to a safe range, and the pressure gradually decreases from 1.3 MPa to below 0.1 MPa. This physical throttling method avoids severe friction between the high-speed airflow and the inner wall of the pipe, reducing static electricity generation and structural fatigue caused by airflow impact, further improving the operational stability of the unit.

[0017] (2) Multi-stage throttling and noise reduction: The surface of the U-shaped microporous baffle is densely covered with 0.5-1.0mm micropores, and the opening rate is controlled at 40%-50%. When the airflow passes through, the energy is dissipated due to the throttling expansion, which effectively weakens the noise generated by the airflow. The spacing between each set of baffles is 180-220mm to ensure that each stage of throttling can fully consume the kinetic energy of the airflow and avoid noise superposition; Three-dimensional porous sound absorption: The porosity of the metal wire sound absorption layer on the inner wall of the cylinder is 70%-80%. The three-dimensional interwoven structure can absorb mid-to-high frequency noise at the same time, which complements the throttling and noise reduction. Compared with traditional flammable sound absorption materials such as glass wool and rock wool, stainless steel wire has both sound absorption and conductivity functions, which not only meets environmental protection requirements, but also avoids the risk of combustion caused by high temperature oxygen; Structural optimization and noise reduction: The vertical cylindrical body design makes the airflow evenly distributed along the axis, avoiding low-frequency noise generated by local eddies; The bottom support frame is rigidly connected to the cylinder to reduce vibration transmission and further reduce structural radiation noise. The overall noise reduction effect meets the "Industrial Enterprise Noise Emission Standard", effectively protecting the hearing health of on-site operators and avoiding noise pollution.

[0018] (3) Corrosion and high pressure resistance: The core components such as the cylinder, baffle, and flame arrester are all made of 304 / 316L stainless steel, which can withstand low-temperature corrosion and high-pressure impact in the liquid oxygen environment. The design pressure is ≥2.0MPa, which is much higher than the conventional working pressure of the liquid oxygen station (1.3MPa), ensuring that the device does not deform or leak under extreme conditions; No moving parts and maintenance-free: The vacuum chamber can play the role of heat insulation, sound insulation and noise reduction, further improving the noise reduction effect; There are no moving parts such as valves and springs inside the device, avoiding the safety risks caused by mechanical failure; The flame arrester and sound absorption layer adopt a modular design, which can be disassembled and replaced separately, with extremely low maintenance costs and a service life of more than 10 years, which is far superior to the 3-5 year life cycle of traditional silencers; Compact layout: The inner diameter of the cylinder is 320-330mm and the total height is 1850-1900mm. The compact structure is convenient for on-site installation and can be directly connected in series with the existing DN40 pressure relief pipeline without modifying the original pipeline system, which is suitable for the limited space layout of the liquid oxygen station. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator of the present invention; Figure 2 This is a partially enlarged view of the multi-stage voltage reduction and deceleration component of the present invention.

[0021] 1. Cylinder body; 2. Bottom air inlet; 3. Top exhaust port; 4. Support legs; 5. Bottom flame arrester; 6. Multi-stage pressure reduction and deceleration assembly; 6.1. U-shaped stainless steel wire microporous baffle; 7. Static electricity elimination sound absorption layer; 8. Top flame arrester; 9. Vacuum chamber; 10. Vacuum valve. Detailed Implementation

[0022] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses consistent with some aspects of this disclosure as detailed in the appended claims.

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Overall Structure and Installation The oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator of the present invention has an overall vertical cylindrical structure. The core components include: cylinder 1, bottom air inlet 2, top exhaust outlet 3, support bracket 4, bottom flame arrester 5, multi-stage pressure reduction and deceleration assembly 6, electrostatic elimination sound absorption layer 7, and top flame arrester 8.

[0025] Implementation of cylinder and supporting structure The cylinder body 1 is made of seamless 316L stainless steel pipe with a precisely controlled inner diameter of φ325mm and a total height of 1882mm, of which the effective treatment section is 1100mm high and the bottom support frame 4 is 600mm high. End caps are welded to the top and bottom of the cylinder body. A bottom air inlet 2 is located in the center of the bottom end cap, and two symmetrical top exhaust ports 3 are located on the top end cap. Both the air inlet and exhaust ports are connected using PN16 flanges with waterline sealing grooves machined on the flange faces. PTFE gaskets are used to ensure no leakage under high-pressure oxygen conditions.

[0026] The support frame consists of three sets of symmetrically distributed stainless steel legs. The legs are fully welded to the bottom end cap of the cylinder. A square base plate is welded to the bottom of the legs and fixed to the concrete foundation with expansion bolts. Diagonal reinforcing ribs are welded between the legs and the cylinder to improve the overall vibration and wind load resistance, ensuring that the device does not tilt or deform during long-term operation.

[0027] Inside the vertical cylindrical shell 1, a vacuum cavity 9 is provided, and vacuum pumping operations are carried out through a vacuum valve 10. The inner space of the interlayer is set to 50 mm. By setting the vacuum cavity 9, heat insulation, sound insulation, and noise reduction effects can be achieved.

[0028] Installation of internal components Assemble the internal components sequentially from bottom to top: Bottom flame arrester 5: It is composed of 12 layers of 0.8 mm thick 304 stainless steel mesh plates stacked together. The mesh hole density is 200 meshes. The mesh plates are fixed by spot welding to form a flame retardant unit with a thickness of 80 mm. It is embedded 80 mm above the bottom head of the shell and welded and sealed with an interference fit with the inner wall of the shell to ensure that all airflows pass through the flame retardant mesh plates without short - circuit channels.

[0029] Multi - stage pressure reduction and deceleration component 6: It is composed of 4 groups of streamlined U - shaped stainless metal wire microporous baffles 61. Each group of baffles is formed by stamping 0.6 mm thick 316L stainless steel plates, with a bending radius of 80 mm. Micropores with a diameter of 0.8 mm are stamped on the surface, and the porosity is controlled at 45%. The 4 groups of baffles are evenly distributed along the axial direction of the shell at a vertical interval of 200 mm. Both ends of each group of baffles are fully welded and fixed to the inner wall of the shell to form a closed air flow return channel to prevent the air flow from directly short - circuiting through.

[0030] Static electricity elimination and sound absorption layer 7: On the inner wall of the shell above the multi - stage pressure reduction and deceleration component 6, a 304 stainless steel wire intertwined layer with a thickness of 8 mm is laid. The diameter of the metal wire is 0.1 mm, and a three - dimensional porous structure is formed by using a warp - weft interweaving method, with a porosity of 75%. The metal wire layer is fixed to the inner wall of the shell by multi - point spot welding, and at the same time, a copper grounding wire is led out and reliably connected to the plant's static grounding network, with a grounding resistance ≤ 4Ω, ensuring that the static electricity carried by the air flow can be exported in real time.

[0031] Top flame arrester 8: It is composed of 15 layers of 0.8 mm thick 304 stainless steel mesh plates stacked together. The mesh hole density is 220 meshes, forming a flame retardant unit with a thickness of 106 mm. It is embedded 100 mm below the top head of the shell and welded and sealed with the inner wall of the shell. Its flame retardant performance is better than that of the bottom flame arrester, mainly preventing the risk of backfire on the exhaust side.

[0032] Pipe connection implementation The bottom air inlet 2 is flange - connected to the liquid oxygen station storage tank pressure relief pipe through a DN40 stainless steel seamless pipe. An electrostatic cross - connecting wire is installed at the connection. The cross - connecting wire uses a 6 mm² copper core wire to ensure that the potential of the pipe and the device is the same; the top exhaust port 3 is connected to a 5 - meter - high exhaust chimney through a DN40 stainless steel seamless pipe, and a rain - proof cap is installed at the top of the chimney to prevent rainwater from entering the device. After the installation of the entire device and the pipeline system, a hydrostatic test of 1.5 times the working pressure, that is, 1.95 MPa, is carried out, and it is qualified if there is no leakage and no deformation after maintaining the pressure for 30 minutes.

[0033] Example 1: Application of conventional liquid oxygen station depressurization conditions 1. Working Condition Background A railway company's liquid oxygen station is equipped with a 20m³ liquid oxygen storage tank. The normal oxygen supply pressure is 1.3MPa, and the pressure inside the liquid oxygen tank car is 0.6MPa. When the liquid level in the storage tank drops to 3 tons, the pressure in the storage tank must be depressurized to a pressure difference of 0.4MPa before liquid oxygen can be added. The depressurization flow rate is about 800Nm³ / h, and the depressurization time is about 15 minutes.

[0034] Equipment operation implementation The oxygen pressure relief explosion-proof electrostatic vacuum noise silencing device of the present invention is connected in series to the pressure relief pipeline of the storage tank. After the pressure relief operation is started, 1.3MPa high-pressure oxygen enters the device through the bottom air inlet 2: Step 1: The airflow passes through the bottom flame arrester 5, which initially homogenizes the airflow and blocks any possible small flames, reducing the pressure to 1.1 MPa; Step 2: The airflow enters 4 sets of U-shaped microporous baffles 61, and after 4 folds and expansions, the pressure is gradually reduced to 0.8MPa, 0.5MPa, 0.3MPa and 0.1MPa, and the flow velocity is reduced from the initial 30m / s to below 5m / s, so as to achieve sufficient pressure reduction and deceleration. Step 3: The airflow passes through the electrostatic elimination sound-absorbing layer 7. The static electricity generated by the friction of the high-speed airflow is conducted to the grounding grid through the metal wire layer, and the static elimination rate reaches 99.5%. At the same time, the airflow noise is absorbed by the three-dimensional porous structure, and the noise value drops from the initial 110dB to 48dB. Step 4: The airflow passes through the top flame arrester 8, further blocking the backfire path, and is finally safely discharged into the atmosphere through a 5-meter high exhaust pipe.

[0035] Effect verification During operation, the device exhibited no electrostatic discharge and no risk of backfire. The on-site noise level was 48 dB, which meets the noise limit requirements for the plant area in the "Industrial Enterprise Noise Emission Standard" GB12348-2008. The depressurization process was stable and did not affect the liquid oxygen filling operation, verifying the safety and noise reduction effect of the invention under normal operating conditions.

[0036] Example 2: Safety Redundancy Verification under Extreme Operating Conditions 1. Working Condition Background Simulating extreme working conditions: The pressure in the liquid oxygen station storage tank abnormally rises to 1.5MPa, and the pressure relief flow rate increases to 1200Nm³ / h. At the same time, an external fire source is simulated to approach the exhaust port to test the explosion-proof and fire-retardant performance of the device.

[0037] Equipment operation implementation Initiate pressure relief procedures under overpressure conditions: After high-pressure oxygen enters the device, the multi-stage U-shaped baffle 61 rapidly reduces the pressure from 1.5MPa to 0.12MPa through a greater throttling expansion effect, and controls the flow rate to within 6m / s to avoid high-speed airflow from aggravating static electricity generation. The electrostatic elimination sound-absorbing layer 7 continuously discharges static electricity, and even under high pressure and high flow conditions, the electrostatic potential is still controlled below 0.1kV, with no discharge sparks generated. When an external fire source approaches the top vent, the flame attempts to backfire along the pipe. The top flame arrester 8 quickly extinguishes the flame through the high-density mesh plate, and the flame does not penetrate the flame arrester. The bottom flame arrester 5 further forms secondary protection, completely blocking the path of backfire to the storage tank.

[0038] Effect verification Under extreme conditions, the device did not deform or leak, and there was no electrostatic discharge or backfire. The noise level was controlled within 52dB, still meeting environmental protection requirements. After the pressure relief was stopped, there were no residual flames or high-temperature points inside the device, and it quickly returned to normal temperature, verifying the safety redundancy capability of the invention under extreme scenarios such as overpressure and external fire sources.

[0039] Maintenance and overhaul implementation The device of this invention adopts a design with no moving parts, and routine maintenance only requires periodic inspections: The grounding resistance should be checked quarterly to ensure that the grounding resistance is ≤4Ω. Every six months, remove the top cap and check whether the flame arrester and sound-absorbing layer are blocked. If there are impurities, use high-pressure nitrogen to purge and clean them. A hydrostatic test is conducted annually to verify the sealing performance and structural strength of the device. If the flame arrester or sound-absorbing layer is damaged, it can be disassembled and replaced separately without the need to remove the entire device, making maintenance convenient.

[0040] Through the above specific implementation methods and two embodiments, the safety, noise reduction effect and reliability of the present invention under normal and extreme working conditions can be fully verified, providing a feasible safety solution for flammable and explosive industrial gas pressure relief scenarios.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator, characterized in that: It includes a vertical cylindrical body (1), a bottom air inlet (2), a top exhaust outlet (3), support legs (4), and a multi-stage processing assembly set inside the body (1). The bottom air inlet (2) is connected to the pressure relief pipe of the liquid oxygen station storage tank through a DN40 stainless steel seamless pipe. The top exhaust outlet (3) is connected to a 5-meter high exhaust pipe through a DN40 stainless steel seamless pipe. The support legs (4) are symmetrically distributed at the bottom of the body (1) to stably support the entire device.

2. The oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator according to claim 1, characterized in that: The cylinder (1) is provided with a bottom flame arrester (5), a multi-stage pressure reduction and deceleration assembly (6), an electrostatic elimination sound absorption layer (7), and a top flame arrester (8) from bottom to top. The bottom flame arrester (5) and the top flame arrester (8) are both made of multiple layers of stainless steel metal mesh plates stacked together. The thickness of the mesh plate is 0.6-1.0 mm and the mesh density is 180-220 mesh, which is used to block the flame propagation path in both directions.

3. The oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator according to claim 2, characterized in that: The multi-stage depressurization assembly (6) consists of four sets of streamlined U-shaped stainless steel wire microporous baffles (61) stacked alternately along the axial direction of the cylinder (1). The vertical spacing between each set of baffles (61) is 180-220mm. The surface of the baffles (61) is densely covered with micropores with a diameter of 0.5-1.0mm and an opening rate of 40%-50%, which causes the airflow to fold and expand multiple times in the cylinder, thereby achieving step-by-step depressurization.

4. The oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator according to claim 3, characterized in that: The bending radius of the U-shaped baffle (61) is 1 / 3 to 1 / 2 of the inner diameter of the cylinder (1). The two ends of the baffle (61) are welded and fixed to the inner wall of the cylinder (1) to form a closed airflow return channel, avoid airflow short circuit, and ensure that the depressurization and speed reduction effect of each stage is sufficient.

5. The oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator according to claim 2, characterized in that: The electrostatic elimination sound-absorbing layer (7) is laid on the inner wall of the cylinder (1) and located between the multi-stage deceleration assembly (6) and the top flame arrester (8). The electrostatic elimination sound-absorbing layer (7) is made of 304 stainless steel wire with a diameter of 0.08-0.12mm and a thickness of 610mm. The wire is reliably welded to the cylinder (1) and grounded to eliminate static electricity carried by the airflow and absorb noise.

6. The oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator according to claim 5, characterized in that: The electrostatic sound-absorbing layer (7) has a three-dimensional porous channel formed by the interwoven structure of metal wires. The porosity is 70%-80%, which can absorb mid-to-high frequency noise at the same time. Combined with the throttling and noise reduction of the multi-stage voltage reduction and deceleration component (6), the overall noise reduction reaches more than 60dB.

7. The oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator according to claim 2, characterized in that: The thickness of the bottom flame arrester (5) is 70-90mm, and the thickness of the top flame arrester (8) is 100-120mm. The thickness of the top flame arrester (8) is greater than that of the bottom flame arrester (5) to enhance the ability to block backfire on the exhaust side and further improve safety redundancy. The inner diameter of the cylinder (1) is 320-330mm, and the total height is 1850-1900mm, of which the height of the effective treatment section is 1050-1150mm, and the height of the bottom support bracket (4) is 550-650mm, to ensure that the device structure is compact and the airflow treatment time is sufficient.

8. The oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator according to claim 1, characterized in that: Both the bottom air inlet (2) and the top exhaust port (3) adopt a flange connection structure. The flange specifications are matched with DN40 stainless steel seamless pipe. Static jumper wires are set at the connection to ensure that the entire device is grounded and conductive, eliminating the risk of static electricity accumulation.

9. The oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator according to claim 1, characterized in that: According to claim 1, an oxygen pressure relief explosion-proof electrostatic vacuum noise eliminator is characterized in that: a vacuum chamber (9) is provided inside the vertical cylindrical body (1), and a vacuum valve (10) is installed outside the vertical cylindrical body (1).

10. The oxygen depressurization explosion-proof electrostatic vacuum noise eliminator according to any one of claims 1 to 9, characterized in that: The device is suitable for liquid oxygen station storage tank depressurization scenarios. When the pressure inside the storage tank is 1.3MPa and the pressure in the tank truck is 0.6MPa, and the pressure difference drops to 0.4MPa, the depressurized oxygen, after being processed by the device, has an outlet pressure that drops below 0.1MPa, an electrostatic elimination rate of ≥99%, and a noise reduction to below 60dB, thus achieving safe and environmentally friendly oxygen emission.

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