A kind of anti-blocking fire prevention system and method with vibration ash cleaning and steam heated nitrogen back purge

Abstract

This invention belongs to the technical field of combustible gas safety protection equipment, and particularly relates to a flame arrestor system and method with vibration cleaning and steam-heated nitrogen backflushing. The system includes a shell, a flame arrestor core assembly, a high-frequency pneumatic vibration mechanism, a nitrogen backflushing system, and a vibration isolation and damping system. The flame arrestor core assembly is located inside the shell, and the high-frequency pneumatic vibration mechanism is located on the outer wall of the shell. The nitrogen backflushing system includes a steam-heated heat exchanger for heating nitrogen and introducing it into the shell. The bottom of the shell has an inlet and a drain port, and the top has an outlet connected to a pneumatic shut-off valve. The vibration isolation and damping system includes a damping mounting base and a damping buffer layer, which are respectively connected to the shell and the high-frequency pneumatic vibration mechanism. The advantages are: through the synergistic effect of high-frequency pneumatic vibration loosening impurities, steam-heated nitrogen viscosity reduction purging, and vertical bottom draining, online self-cleaning without shutdown is achieved, improving equipment operation safety and reliability, extending the continuous operation cycle of the flame arrester, and significantly reducing maintenance costs.

Description

Technical Field

[0001] This invention belongs to the technical field of combustible gas safety protection equipment, and in particular relates to a flame arrestor system and method with vibration cleaning and steam-heated nitrogen backflushing. Background Technology

[0002] In industries such as coal chemical, coking, petroleum refining, and pharmaceutical chemicals, the safe transport of combustible gases is a core element in ensuring production continuity and equipment safety. However, these gaseous media often contain complex impurities, such as tar droplets and coke powder in coking tail gas, dust and heavy hydrocarbons in coal gasification, and ammonium salt crystals in sulfur-containing process gases. When these impurities flow through flame arresters, they are highly susceptible to physical adhesion, chemical condensation, or crystallization within the narrow channels of the flame arrester core. This can lead to increased system pressure drop, decreased transport efficiency, and even safety accidents such as pipeline blockage, overpressure, leakage, and explosion.

[0003] Currently, the fixed flame arresters commonly used in industrial sites lack online self-cleaning capabilities. When blockage occurs, the system must be shut down for manual cleaning, resulting in high maintenance costs and disruptions to production continuity. To address this issue, flame arresters with dust-removing functions have been designed, but these designs exhibit significant technical drawbacks during operation. First, the cleaning method poses safety hazards. Some flame arresters use electrically driven mechanical scrapers or brushes for contact cleaning. In flammable and explosive environments containing combustible gases, the electric components themselves constitute a potential ignition source, posing a risk of explosion caused by electrical sparks, and are also prone to damaging the flame arrester core.

[0004] Secondly, vibration cleaning technology carries the risk of structural failure. Some solutions use vibration to remove ash from flame arresters, but high-frequency vibration can easily be transmitted to process pipelines through equipment flanges, causing secondary problems such as pipeline resonance, flange seal failure, and fatigue damage to pipeline supports, which will seriously affect the long-term safe operation of the unit.

[0005] Third, the backflushing medium poses a risk of combustion and explosion and has limited effectiveness. Existing backflushing technologies mostly use ambient temperature compressed air as the purging medium. On the one hand, compressed air contains oxygen, which may mix with flammable gases in the pipeline during the purging process to form an explosive atmosphere, posing a risk of combustion and explosion. On the other hand, ambient temperature gas cannot effectively reduce the viscosity of sticky impurities such as tar and heavy hydrocarbons, making it difficult to clean off already adhered or condensed sticky contaminants, resulting in poor dust removal.

[0006] In summary, there is currently no flame arrester system that can integrate non-contact safe cleaning, effective reduction of adhesive impurity adhesion, blocking vibration transmission, and achieving fully pneumatic intrinsic safety control. How to safely and efficiently remove tar, dust, and crystalline salts adhering to the surface of the flame arrester core without shutting down the system, and to avoid vibration damage to the process piping system, has become a pressing technical challenge in this field. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the purpose of this invention is to provide a flame arrestor system and method with vibration cleaning and steam-heated nitrogen backflushing, which solves the technical problems of existing flame arrestors being prone to clogging, having high maintenance costs, posing safety hazards, and causing pipeline resonance and structural fatigue due to vibration cleaning.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A flame arrestor system with vibration cleaning and steam-heated nitrogen backflushing, comprising a shell, a flame arrestor core assembly, a high-frequency pneumatic vibration mechanism, a nitrogen backflushing system, and a vibration isolation and damping system; The housing contains a flame-arresting core assembly, which is a conventional flame-arresting core structure, such as a corrugated plate type or a metal mesh type. A high-frequency pneumatic vibration mechanism is set on the outer wall of the housing. The nitrogen backflush system includes a steam-heated heat exchanger, which heats the nitrogen and sends it into the housing. The bottom of the housing is provided with an air inlet, and a drain port is connected below the air inlet. The drain port allows impurities loosened by vibration to be collected and completely discharged under the combined action of vibration and gravity settling. The top of the housing is connected with an air outlet, and the air outlet is connected with a pneumatic shut-off valve. The vibration isolation and damping system includes a vibration damping mounting base and a damping buffer layer. The damping buffer layer is provided between the vibration damping mounting base and the housing. The vibration damping mounting base is connected to a high-frequency pneumatic vibration mechanism.

[0009] Furthermore, the vibration isolation and damping system also includes a vibration isolation flange, which is connected to the air inlet and air outlet to block the transmission of vibration from the high-frequency pneumatic vibration mechanism to the pipes connected to the air inlet and air outlet.

[0010] Furthermore, the nitrogen backflush system also includes a temperature monitoring component, a backflush pipe, and a pneumatic main control valve. The pneumatic main control valve is connected to the nitrogen inlet of the steam heating heat exchanger, the temperature monitoring component is connected to the nitrogen outlet of the steam heating heat exchanger, and the nitrogen outlet of the steam heating heat exchanger is connected to the shell via the backflush pipe. The steam outlet of the steam heating heat exchanger is connected to the condensate recovery network.

[0011] Furthermore, the backflush pipe is a shock-resistant metal flexible hose.

[0012] Furthermore, the drain outlet is located at the bottom of the pipe axis connected to the center of the bottom of the shell, and a pneumatic drain valve is connected to the drain outlet.

[0013] Furthermore, a conveying pipe is connected to the pipe at the center of the bottom of the shell.

[0014] Furthermore, the damping buffer layer is a high-temperature resistant damping coating; the vibration isolation flange has a built-in annular elastic damping ring.

[0015] A method for preventing flame retardation and blocking, comprising the following steps: Vibration cleaning and steam-heated nitrogen backflushing 1) First, close the pneumatic shut-off valve and open the pneumatic drain valve; 2) Start the high-frequency pneumatic vibration mechanism and simultaneously start the nitrogen backflushing system; use steam to heat nitrogen in the steam-heated heat exchanger, heat the nitrogen to 110℃~120℃ and send it into the shell, entering from above the flame arrestor core assembly to purge the flame arrestor core assembly. Under the action of the high-frequency pneumatic vibration mechanism, impurities attached to the flame arrestor core assembly are discharged to the sewage pipe network through the air inlet and drain outlet; the steam is factory-produced steam, steam drum by-product steam or process waste heat steam; 3) Turn off the nitrogen backflush system, delay the shutdown of the high-frequency pneumatic vibration mechanism, then close the pneumatic drain valve, and finally open the pneumatic shut-off valve.

[0016] The steam pressure is 0.4MPa to 0.6MPa, and the temperature is 144℃ to 159℃.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves online, non-stop self-cleaning by combining high-frequency pneumatic vibration to loosen impurities, steam heating and nitrogen viscosity reduction purging, and vertical bottom sewage discharge, thereby improving the safety and reliability of equipment operation, extending the continuous operation cycle of the flame arrester, and significantly reducing maintenance costs.

[0018] 2. This invention is inherently safe and reliable. It uses fully pneumatic valves with no electric components, and nitrogen is used as an inert purging medium. The heating temperature is much lower than the auto-ignition temperature of combustible gases, fundamentally eliminating the risk of electrical sparks and explosions.

[0019] 3. This invention is applicable to flammable gas pipelines containing tar, high dust, and easily crystallizing salts in coking, coal chemical, and petrochemical industries. Vibration parameters, nitrogen temperature, and purging pressure can be adjusted according to operating conditions, making it widely adaptable. This invention can utilize waste heat steam from the plant to heat nitrogen, requiring no additional energy investment and resulting in low operating costs. Non-contact vibration cleaning avoids damage to the flame arrestor core, extending equipment lifespan. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a structural schematic diagram of the vibration damping mounting base.

[0022] In the diagram: 1-Shell, 2-Flame arrestor core assembly, 3-Inlet, 4-Outlet, 5-Drain port, 51-Pneumatic drain valve, 6-High-frequency pneumatic vibration mechanism, 7-Nitrogen backflush system, 71-Steam heating heat exchanger, 72-Temperature monitoring component, 73-Backflush pipe, 74-Pneumatic main control valve, 8-Vibration isolation and damping system, 81-Vibration damping mounting base, 811-Metal frame, 812-High-temperature resistant rubber, 82-Damping buffer layer, 83-Vibration isolation flange, 9-Pneumatic shut-off valve. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0024] See Figure 1 A flame arrestor system with vibration cleaning and steam-heated nitrogen backflushing for flame extinguishing and ash removal includes a housing 1, a flame arrestor core assembly 2, a high-frequency pneumatic vibration mechanism 6, a nitrogen backflushing system 7, and a vibration isolation and damping system 8. The housing 1 is a closed pressure-bearing structure. The flame arrestor core assembly 2 is fixedly installed inside the housing 1 in the middle position, adopting a corrugated plate structure with an oil-repellent, non-stick, and high-temperature resistant surface treatment, serving as the core element for flame quenching. The system is installed vertically, with an outlet 4 and an inlet 3 at the top and bottom of the housing 1, respectively. The outlet 4 at the top of the housing 1 is connected to a pneumatic shut-off valve 9. The pneumatic shut-off valve 9 can be a pneumatic butterfly valve, which is closed during the backflushing cleaning phase to concentrate the purge airflow on the flame arrestor core assembly 2, preventing airflow and impurities from entering the downstream system; it is opened during normal operation to ensure the smooth passage of combustible gas. A drain port 5 is located at the bottom of the pipe connected to the air inlet 3, at the root of the pipe axis. A pneumatic drain valve 51 is connected to the drain port 5 to ensure that impurities loosened by vibration slide smoothly down the inner wall of the shell 1 to the bottom under the combined action of vibration and gravity settling, and are completely discharged through the pneumatic drain valve 51, without any impurities remaining in dead corners. A conveying pipe is connected to the pipe at the center of the bottom of the shell 1, and the conveying pipe is located between the drain port 5 and the air inlet 3.

[0025] The high-frequency pneumatic vibration mechanism 6 is located on the symmetrical outer walls of the housing 1. It is pneumatically driven, supplied with nitrogen, and its internal moving parts are made of non-ferrous metals or non-metallic anti-friction materials. The movement process is free from severe friction and impact, and does not generate mechanical sparks. Its operating frequency is 50Hz–100Hz, and its amplitude is 0.1mm–0.3mm. It achieves non-contact mechanical loosening of dust and crystals on the surface of the flame arrestor core assembly 2 through high-frequency micro-amplitude vibration. The high-frequency pneumatic vibration mechanism 6 is a pneumatic piston-type high-frequency vibrator with a metal-frame rubber composite structure. The rubber layer is made of oil-resistant and high-temperature-resistant nitrile rubber, and the metal frame is made of stainless steel, enabling it to withstand high-temperature and high-pressure conditions and effectively attenuating vibration energy.

[0026] The nitrogen backflush system 7 includes a steam-heated heat exchanger 71, which heats nitrogen and feeds it into the shell 1. The system also includes a temperature monitoring component 72, a backflush pipe 73, and a pneumatic main control valve 74. The pneumatic main control valve 74 is connected to the nitrogen inlet of the steam-heated heat exchanger 71, and the temperature monitoring component 72 is connected to the nitrogen outlet of the steam-heated heat exchanger 71. The nitrogen outlet of the steam-heated heat exchanger 71 is connected to the shell 1 via the backflush pipe 73. The steam outlet of the steam-heated heat exchanger 71 is connected to the condensate recovery network. The steam-heated heat exchanger 71 is a shell-and-tube structure, with its heat source being plant-produced steam, steam from the steam drum, or waste heat steam. The steam pressure is 0.4 MPa to 0.6 MPa, and the temperature is 144°C to 159°C. Nitrogen is heated to 110°C to 120°C through indirect heat exchange. This temperature range can significantly reduce the viscosity of viscous fluids. Temperature monitoring component 72, in conjunction with pneumatic main control valve 74, monitors the nitrogen temperature after heating in real time. If the temperature exceeds the limit, the nitrogen supply is automatically cut off to ensure safety. Backflush pipe 73 is a shock-resistant metal flexible hose used to prevent vibration of the housing 1 from being transmitted to the heat exchange area. Heated nitrogen is sent into the housing 1 through backflush pipe 73 and purged to the outlet side cavity of the flame arrestor core assembly 2 for efficient reverse purging.

[0027] The vibration isolation and damping system 8 includes a damping mounting base 81, a damping buffer layer 82, and a vibration isolation flange 83. This triple structure works together to block vibration transmission. The damping mounting base 81 is connected to the housing 1 via the damping buffer layer 82. The damping mounting base 81 is connected to the high-frequency pneumatic vibration mechanism 6. (See...) Figure 2The vibration damping mounting base 81 is a ring-shaped metal frame 811, covered with a high-temperature resistant rubber layer 812. The high-temperature resistant rubber layer 812 contacts the damping buffer layer 82, and the installation of the vibration damping mounting base 81 can achieve a good vibration damping effect. The damping buffer layer 82 is a high-temperature resistant damping coating, sprayed on the outer wall of the housing 1 and the installation area of ​​the vibration mechanism, with a thickness of 0.5mm to 1.0mm. It can convert vibration energy into heat energy dissipation, further reducing the vibration amplitude. The damping buffer layer 82 is formed by spraying damping coating, and the damping coating can be selected from the Shutex vibration damping and noise reduction damping coating series (model 210-B). The vibration isolation flange 83 is connected to the connection surface between the air inlet end 3, the air outlet end 4 and the pipeline, and is used to block the transmission of vibration of the high-frequency pneumatic vibration mechanism 6 to the pipeline connecting the air inlet end 3 and the air outlet end 4. The vibration isolation flange 83 has a built-in annular elastic damping ring made of fluororubber with a temperature range of -20℃ to 200℃. It can block the vibration of the shell 1 from being transmitted to the pipeline, thus avoiding pipeline resonance and structural fatigue.

[0028] The high-frequency pneumatic vibration mechanism 6 applies high-frequency vibration to the flame arrestor core assembly 2 through its vibration transmission rod. During vibration, loosened impurities in the flame arrestor core assembly 2 smoothly slide down the inner wall of the shell 1 and collect at the bottom. The vibration damping mounting base 81, the damping buffer layer 82, and the vibration isolation flange 83 form a multi-stage vibration damping and isolation structure to prevent the transmission of vibration from the shell 1 to upstream and downstream process pipelines, connecting flanges, and pipe supports, thus avoiding pipeline resonance, sealing failure, and fatigue damage to the supports, and ensuring the long-term safe operation of the device. It should be noted that the vibration damping mounting base 81 is only connected to the shell 1 through the damping buffer layer 82 and is not fixed to external structures such as platforms, supports, and foundations. This is to prevent vibration from being transmitted to the process system through rigid supports. The vibration energy is mainly converted into heat energy dissipation by the damping buffer layer, and the remaining energy decays on its own inside the shell 1, thereby achieving vibration isolation and preventing pipeline resonance and sealing failure.

[0029] All control and actuator mechanisms of the system adopt a fully pneumatic structure, with nitrogen as the air source, and do not use any electric components, thus eliminating the risk of electrical sparks at the source.

[0030] A method for preventing flame retardation and blocking, comprising the following steps: Vibration cleaning and steam-heated nitrogen backflushing 1) First, close the pneumatic shut-off valve 9 and open the pneumatic drain valve 51; 2) Start the high-frequency pneumatic vibration mechanism 6, and simultaneously start the nitrogen backflushing system 7; use steam to heat nitrogen in the steam-heated heat exchanger 71, heat the nitrogen to 110℃~120℃ and send it into the shell 1, entering from above the flame arrestor core assembly 2 to purge the flame arrestor core assembly 2. Under the action of the high-frequency pneumatic vibration mechanism 6, the impurities attached to the flame arrestor core assembly 2 are discharged to the sewage pipe network through the air inlet 3 and the sewage outlet 5; wherein, the steam is factory-produced steam, steam from the steam drum by-product steam or process waste heat steam; wherein, the steam pressure is 0.4MPa~0.6MPa and the temperature is 144℃~159℃; 3) After purging, shut down the nitrogen back-purge system 7, delay the shutdown of the high-frequency pneumatic vibration mechanism 6, then close the pneumatic drain valve 51, and finally open the pneumatic shut-off valve 9.

[0031] Example: This embodiment is applied to the HPF desulfurization tail gas transmission pipeline, with a nominal diameter of DN200, a design pressure of 15kPa, an operating temperature of 40℃, and a medium containing coke powder, tar droplets, elemental sulfur, and ammonium salt crystals.

[0032] The self-cleaning flame arrestor system is installed vertically. The housing 1 is made of 304 stainless steel with a nominal diameter of DN200 and a design pressure of 1.0MPa. The flame arrestor core assembly 2 is a corrugated plate type with a polytetrafluoroethylene (PTFE) oleophobic coating. The drain port 5 is located at the root of the pipe axis at the bottom of the housing 1. The pneumatic drain valve 51 is a pneumatic ball valve with a nominal diameter of DN50.

[0033] Two high-frequency pneumatic vibration mechanisms 6 are symmetrically installed on the left and right sides, with an operating frequency of 80Hz and an amplitude of 0.2mm. The mounting area of ​​the housing 1 is coated with a 0.8mm thick high-temperature resistant damping coating. The high-frequency pneumatic vibration mechanism 6 drives the flame arrestor core assembly 2 to vibrate at high frequency via a vibration transmission rod. The damping layer on the housing, together with the vibration damping mounting base 81, buffers and attenuates the vibration transmitted to the housing, preventing excessive vibration and structural fatigue. The vibration isolation flange 83 has a built-in fluororubber damping ring, which is installed at the connection points between the air inlet end 3, the air outlet end 4, and the process pipeline.

[0034] The steam heating heat exchanger 71 of the nitrogen backflush system 7 uses steam produced by the factory steam drum, with a steam pressure of 0.4 MPa and a temperature of 144°C, to heat the nitrogen to 110°C, and the nitrogen purging pressure is 0.5 MPa.

[0035] The pneumatic shut-off valve 9 is a pneumatic butterfly valve. The pneumatic shut-off valve 9, the pneumatic drain valve 51, the high-frequency pneumatic vibration mechanism 6, and the pneumatic main control valve 74 of the nitrogen backflush system 7 are linked and controlled by a pneumatic delay device.

[0036] The cleaning process is executed automatically in the following sequence: 1. Close the pneumatic shut-off valve 9 at the outlet end 4 to block the downstream pipeline connection; 2. Open the pneumatic drain valve 51 to establish a drain channel; 3. Start the high-frequency pneumatic vibration mechanism 6 and run it for 30 seconds to allow the coke powder and crystalline salt on the flame arrestor core to be fully loosened and settled. 4. Open the pneumatic main control valve 74 to introduce heated nitrogen gas at 115±2℃ and purge for 60 seconds; 5. The high-frequency pneumatic vibration mechanism 6 operates synchronously with nitrogen backflush to achieve triple synergy of vibration desorption, heating to reduce viscosity, and airflow purging; 6. After purging for 60 seconds, close the pneumatic main control valve 74 to stop nitrogen back purging; 7. The high-frequency pneumatic vibration mechanism 6 continues to run for 10 seconds to ensure that residual impurities settle completely; 8. Close the pneumatic drain valve 51 to complete the draining process; 9. Open the pneumatic shut-off valve 9 at the air outlet 4, and the system will return to normal operation.

[0037] This invention features highly efficient self-cleaning: through the synergistic effects of high-frequency pneumatic vibration to loosen impurities, steam-heated nitrogen purging to reduce viscosity, and vertical bottom drainage, it achieves online, non-stop self-cleaning, significantly reducing maintenance costs and extending operating cycles. The system is inherently safe, employing full pneumatic control with no electric components; using inert nitrogen as the purging medium, its heating temperature is far below the auto-ignition temperature of combustible gases, completely eliminating the risk of electrical sparks and explosions. This invention can utilize waste heat steam from the factory to heat the nitrogen, requiring no additional energy consumption; non-contact vibration cleaning avoids damage to the flame arrestor core, extending equipment life; it is suitable for coking, coal chemical, and petrochemical industries, where tar, high dust, and easily crystallizing salts are present, and the vibration parameters, nitrogen temperature, and purging pressure are adjustable, making it widely adaptable.

Claims

1. A flame arrestor system with vibration cleaning and steam-heated nitrogen backflushing, characterized in that, Includes housing, flame arrestor core assembly, high-frequency pneumatic vibration mechanism, nitrogen backflushing system, and vibration isolation and damping system; The housing contains a flame-arresting core assembly, and a high-frequency pneumatic vibration mechanism is located on the outer wall of the housing. The nitrogen backflush system includes a steam-heated heat exchanger, which heats the nitrogen and sends it into the housing. The bottom of the housing is provided with an air inlet, and a drain port is connected below the air inlet. The top of the housing is connected with an air outlet, and a pneumatic shut-off valve is connected to the air outlet. The vibration isolation and damping system includes a vibration damping mounting base and a damping buffer layer. The damping buffer layer is provided between the vibration damping mounting base and the housing. The vibration damping mounting base is connected to a high-frequency pneumatic vibration mechanism.

2. The anti-blocking and flame-arresting system with vibration cleaning and steam-heated nitrogen backflushing according to claim 1, characterized in that, The vibration isolation and damping system also includes a vibration isolation flange, which is connected to the air inlet and air outlet to block the transmission of vibration from the high-frequency pneumatic vibration mechanism to the pipes connected to the air inlet and air outlet.

3. The anti-blocking and flame-arresting system with vibration cleaning and steam-heated nitrogen backflushing according to claim 1, characterized in that, The nitrogen backflush system also includes a temperature monitoring component, a backflush pipe, and a pneumatic main control valve. The pneumatic main control valve is connected to the nitrogen inlet of the steam heating heat exchanger, the temperature monitoring component is connected to the nitrogen outlet of the steam heating heat exchanger, and the nitrogen outlet of the steam heating heat exchanger is connected to the shell via the backflush pipe. The steam outlet of the steam heating heat exchanger is connected to the condensate recovery network.

4. The anti-blocking and flame-arresting system with vibration cleaning and steam-heated nitrogen backflushing according to claim 3, characterized in that, The backflush pipe is a shock-resistant metal flexible hose.

5. The anti-blocking and flame-arresting system with vibration cleaning and steam-heated nitrogen backflushing according to claim 1, characterized in that, The drain outlet is located at the bottom of the pipe axis connected to the center of the bottom of the shell, and a pneumatic drain valve is connected to the drain outlet.

6. The anti-blocking and flame-arresting system with vibration cleaning and steam-heated nitrogen backflushing according to claim 5, characterized in that, A conveying pipe is connected to the pipe at the center of the bottom of the shell.

7. The anti-blocking and flame-arresting system with vibration cleaning and steam-heated nitrogen backflushing according to claim 1, characterized in that, The damping buffer layer is a high-temperature resistant damping coating; the vibration isolation flange has a built-in annular elastic damping ring.

8. A method for preventing flame ignition blockage by combining vibration-assisted cleaning and steam-heated nitrogen backflushing, as described in any one of claims 1-7, characterized in that... Includes the following steps: 1) First, close the pneumatic shut-off valve and open the pneumatic drain valve; 2) Start the high-frequency pneumatic vibration mechanism and simultaneously start the nitrogen back-purge system; use steam to heat nitrogen in the steam-heated heat exchanger, heat the nitrogen to 110℃~120℃ and send it into the shell, enter from above the flame arrestor core assembly, and purge the flame arrestor core assembly. Under the action of the high-frequency pneumatic vibration mechanism, the impurities attached to the flame arrestor core assembly are discharged into the sewage pipe network through the air inlet and the drain outlet. 3) Turn off the nitrogen backflush system, delay the shutdown of the high-frequency pneumatic vibration mechanism, then close the pneumatic drain valve, and finally open the pneumatic shut-off valve.

9. A method for preventing flame ignition blockage with vibration-assisted cleaning and steam-heated nitrogen backflushing according to claim 8, characterized in that, The steam pressure is 0.4MPa to 0.6MPa, and the temperature is 144℃ to 159℃.

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