Gas condensate recycling and torch releasing system

Abstract

The utility model discloses a gas condensate recycling and torch releasing system, and belongs to the technical field of gas. According to the technical scheme, the device comprises a gas condensate collecting tank, a liquid separation tank, a torch barrel and a controller; the gas condensate collecting tank is connected with a low-pressure gas pipe network, a low-pressure nitrogen inlet pipeline I and a low-pressure gas header pipe condensate pipeline, the gas condensate collecting tank is provided with a pressure sensor I and an in-situ glass plate liquid level meter I, and a condensate hydraulic outlet of the low-pressure gas header pipe condensate pipeline is formed in the bottom of the gas condensate collecting tank; the tail ends of the low-pressure gas pipe network and the low-pressure gas header pipe condensate pipeline are communicated with the liquid separation tank; and the liquid separation tank is connected with a water-sealed tank through a pipeline. The condensate collecting tank is arranged on the low-pressure gas pipe network, so that the problem that condensate of the low-pressure gas pipe network cannot be discharged due to a low point is solved, and the problem that the condensate of a condensate pipeline of a low-pressure gas header pipe is frozen in winter is solved.

Description

Technical Field

[0001] This utility model belongs to the field of gas technology, specifically relating to a gas condensate recovery and flare system. Background Technology

[0002] Flare systems play a crucial role in chemical enterprises, ensuring the safe, environmentally friendly, and efficient operation of chemical plants. The methane gas in the low-pressure gas pipeline network released through flares primarily originates from combustible gases that cannot be recovered during the start-up and shutdown of production units. Its main component is alkanes, with methane being the majority, and smaller amounts of ethane, propane, and butane. It also generally contains hydrogen sulfide, carbon dioxide, nitrogen, and water vapor. The combustible gases in the low-pressure gas pipeline network ultimately enter the flare system for complete combustion, solving the problem of flammable and toxic gas emissions while preventing overpressure in pipeline equipment. Due to differences in operating conditions, processes, and materials of various units, liquid phase components will precipitate during the transportation of the gas released into the low-pressure gas pipeline network. These condensed liquid phase components, in addition to a large amount of water, contain a mixture of C5-C8 hydrocarbons, a small amount of hydrocarbons larger than C8, and impurities such as hydrogen sulfide, sulfur dioxide, mercaptans, and sulfides. If this portion of gas condensate is not discharged in time in the low-pressure gas pipeline network, it can easily form a liquid seal at the lowest point of the network, affecting the safe release of flare gas from various units. In addition, the water in the gas condensate accumulates continuously at the lowest point of the network, and there is a risk of freezing in winter, which seriously affects the safe operation of the low-pressure gas pipeline network. Utility Model Content

[0003] This invention provides a gas condensate recovery and flare system. By setting up a condensate collection tank in the low-pressure gas pipeline network, it solves the problem of condensate forming a liquid seal inside the pipeline network due to the inability to discharge condensate at low points, which affects the safe release of flare gas in various devices. It also avoids the problem of condensate freezing in the low-pressure gas main pipeline in winter. The collected condensate is transported in a sealed manner to a separatory tank. After oil-water separation, the sulfur-containing wastewater is sent to the sulfur unit, while the condensate oil is recycled.

[0004] The technical solution of this utility model is as follows:

[0005] The gas condensate recovery and flare system includes a gas condensate collection tank, a separator tank, a flare cylinder, and a controller. The gas condensate collection tank is connected to a low-pressure gas pipeline network, a low-pressure nitrogen inlet pipeline, and a low-pressure gas main condensate pipeline. The gas condensate collection tank is equipped with a pressure sensor and a local glass plate level gauge. The condensate liquid outlet of the low-pressure gas main condensate pipeline is located at the bottom of the gas condensate collection tank, facilitating the recovery of the condensate by filling the tank with nitrogen. The low-pressure gas pipeline network and low-pressure gas... The ends of the main gas condensate pipeline are all connected to the separator tank; the separator tank is connected to the water seal tank via pipeline; the gas condensate collection tank, separator tank, and water seal tank are all equipped with heat tracing pipelines to prevent the tanks from freezing due to low winter temperatures; the water seal tank and separator tank are also connected by a drain pipeline and an overflow pipeline; the water seal tank is equipped with a pressure sensor II, a low-pressure nitrogen inlet pipeline II, a water supply pipeline for the water seal tank, and a gas outlet pipeline; the low-pressure nitrogen inlet pipeline II is equipped with a check valve and a control regulating valve, and the control regulating valve and pressure... Both sensors are electrically connected to the controller; the separator is equipped with a dehydration tank; the separator is connected to pipelines for sulfur removal from sulfur-containing wastewater, condensate oil to condensate oil tank, and gas to gas holder; the gas to gas holder pipeline is connected in sequence to a gas holder, compressor, buffer tank, and purification device; the purification device is connected to the fuel gas network via pipelines; the purification device includes an amine liquid desulfurization system and an alkaline liquid desulfurization system (used to remove large molecular sulfur such as mercaptans and sulfides); the water seal tank is connected to the flare via a gas outlet pipeline. The flare cylinder is connected, and a flare head is installed at the top of the flare cylinder. The flare head is equipped with a continuous light and a smoke-extinguishing steam inlet pipe. The smoke-extinguishing steam inlet pipe is equipped with a smoke-extinguishing steam regulating valve, which is electrically connected to the controller. A molecular seal is installed at the top of the flare cylinder below the flare head. The flare cylinder is connected to a low-pressure nitrogen inlet pipe. A sewage discharge pipe is installed at the bottom of the flare cylinder, which is connected to an external sewage tank. A flame detector is installed in the flare cylinder, and the flame detector is electrically connected to the controller.

[0006] Preferably, both the separator and the water seal tank are equipped with foam defoaming screens.

[0007] Preferably, the gas outlet pipeline is equipped with a flame arrester.

[0008] Preferably, the low-pressure nitrogen inlet pipeline is equipped with a flow-limiting orifice plate.

[0009] Preferably, the molecular seal is equipped with a steam tracing pipeline.

[0010] Preferably, the separator is equipped with a local glass plate level gauge 2, a local glass plate level gauge 3, a level sensor, and a boundary sensor, and both the boundary sensor and the level sensor are electrically connected to the controller.

[0011] Preferably, it also includes a ground flare ignition system, which includes a combustion chamber. The combustion chamber is connected to a natural gas inlet pipeline, a compressed air inlet pipeline, and an internal ignition pipeline. One end of the internal ignition pipeline is close to the flame of the permanent light. The natural gas inlet pipeline is equipped with a pressure sensor, a regulating valve, and a solenoid valve. The compressed air inlet pipeline is equipped with a pressure sensor, a solenoid valve, and a regulating valve. All four pressure sensors are electrically connected to the controller.

[0012] Preferably, it also includes a high-altitude ignition system, which includes a second natural gas inlet pipeline, which is connected to an ignition gun fuel gas pipeline. The ends of both the second natural gas inlet pipeline and the ignition gun fuel gas pipeline are close to the flame of the permanent lamp. Both the second natural gas inlet pipeline and the ignition gun fuel gas pipeline are equipped with flame arresters. The ignition gun fuel gas pipeline is equipped with a shut-off valve, which is electrically connected to the controller.

[0013] Compared with the prior art, this utility model has the following advantages:

[0014] 1. This utility model solves the problem of condensate collection tanks in low-pressure gas pipelines, which prevents condensate from being discharged at low points and forms liquid seals inside the pipeline, thus affecting the safe release of flare gas from various devices. It also avoids the problem of condensate freezing in the low-pressure gas main pipeline during winter.

[0015] 2. Install a low-pressure nitrogen inlet pipeline and purge with a small flow of nitrogen to prevent liquid accumulation at the end of the pipeline;

[0016] 3. Defoaming screens are installed at the top gas outlets of the separator and water seal tank to remove some of the water vapor carried by the gas.

[0017] 4. The separator is equipped with local glass plate level gauge II, local glass plate level gauge III, level sensor, interface sensor, and dehydration pack, which can realize the separation of gas condensate oil and water, and separate the condensate oil and sulfur-containing wastewater for transport.

[0018] 5. A gas degassing tank pipeline was added between the separator and the water seal tank to recover and reuse the gas through subsequent compression and purification.

[0019] 6. The molecular seal is equipped with a steam tracing system. During the winter freeze-thaw prevention period, the condensate inside the molecular seal can be prevented from freezing due to excessively low temperature by using this tracing system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] In the diagram, 1. Gas condensate collection tank; 2. Separator; 3. Flare tube; 4. Low-pressure gas pipeline network; 5. Low-pressure nitrogen inlet pipeline one; 6. Low-pressure gas main condensate pipeline; 7. Water seal tank; 8. Drainage pipeline; 9. Overflow pipeline; 10. Low-pressure nitrogen inlet pipeline two; 11. Water seal tank water replenishment pipeline; 12. Gas outlet pipeline; 13. Flare head; 14. Continuous light; 15. Smoke-extinguishing steam inlet pipeline; 16. Molecular seal; 17. Low-pressure nitrogen inlet pipeline three; 18. Sewage pipeline; 19. Flame detector; 20. Defoaming screen; 21. Flame arrester; 22. Flow limiting orifice plate. 23. Condensate oil to condensate oil tank pipeline; 24. Sulfur-containing wastewater to sulfur removal unit pipeline; 25. Pressure sensor one; 26. Local glass plate level gauge one; 27. Local glass plate level gauge two; 28. Interface sensor; 30. Gas to gas holder pipeline; 31. Explosion chamber; 32. Natural gas inlet pipeline one; 33. Compressed air inlet pipeline; 34. Internal ignition pipeline; 35. Level sensor; 36. Local glass plate level gauge three; 37. Compressor; 38. Buffer tank; 39. Natural gas inlet pipeline two; 40. Ignition gun fuel gas pipeline; 41. Gas holder; 42. Purification device. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model.

[0023] Example 1

[0024] like Figure 1 As shown, this embodiment provides a gas condensate recovery and flare system. The gas condensate recovery and flare system includes a gas condensate collection tank 1, a separator tank 2, a flare cylinder 3, and a controller. The gas condensate collection tank 1 is connected to a low-pressure gas pipeline network 4, a low-pressure nitrogen inlet pipeline 5, and a low-pressure gas main condensate pipeline 6. The gas condensate collection tank 1 is equipped with a pressure sensor 25 and a local glass plate level gauge 26. The ends of the low-pressure gas pipeline network 4 and the low-pressure gas main condensate pipeline 6 are both connected to the separator tank 2. The separator tank 2 is connected to a water seal tank 7 via a pipeline.

[0025] The gas condensate collection tank 1, the separating tank 2 and the water seal tank 7 are all equipped with heat tracing pipelines; the water seal tank 7 and the separating tank 2 are also connected by a drain pipeline 8 and an overflow pipeline 9; the separating tank 2 and the water seal tank 7 are both equipped with a defoaming screen 20;

[0026] Water seal tank 7 is equipped with pressure sensor 2, low-pressure nitrogen inlet pipeline 2 10, water seal tank water supply pipeline 11, and gas outlet pipeline 12. Gas outlet pipeline 12 is equipped with flame arrester 21. Low-pressure nitrogen inlet pipeline 2 10 is equipped with a check valve and a control regulating valve. The control regulating valve and pressure sensor 2 are both electrically connected to the controller. Separator tank 2 is equipped with dehydration bag.

[0027] Separating tank 2 is connected to a sulfur removal device pipeline 24 for sulfur-containing wastewater, a condensate oil to condensate oil tank pipeline 23, and a gas to gas holder pipeline 30. The gas to gas holder pipeline 30 is connected in sequence to a gas holder 41, a compressor 37, a buffer tank 38, and a purification device 42. The purification device 42 is connected to the fuel gas network via a pipeline. Water seal tank 7 is connected to flare cylinder 3 via gas outlet pipeline 12. A flare head 13 is installed at the top of flare cylinder 3. The flare head 13 is equipped with a continuous light 14 and a smoke-extinguishing steam inlet pipeline 15. Smoke-extinguishing steam is introduced into the flare cylinder. Pipeline 15 is equipped with a smoke-extinguishing steam regulating valve, which is electrically connected to the controller. A molecular seal 16 is installed at the top of the flare tube 3 below the flare head 13, and a steam tracing pipeline is installed on the molecular seal 16. The flare tube 3 is connected to a low-pressure nitrogen inlet pipeline 17, which is equipped with a flow-limiting orifice plate 22. A sewage discharge pipeline 18 is installed at the bottom of the flare tube 3, which is connected to an external sewage tank. A flame detector 19 is installed in the flare tube 3, and the flame detector 19 is electrically connected to the controller.

[0028] The separator 2 is equipped with a local glass plate level gauge 27, a local glass plate level gauge 36, a level sensor 35, and a boundary sensor 28. Both the boundary sensor 28 and the level sensor 35 are electrically connected to the controller.

[0029] It also includes a ground flare ignition system, which includes a combustion chamber 31. The combustion chamber 31 is connected to a natural gas inlet pipeline 32, a compressed air inlet pipeline 33, and an internal ignition pipeline 34. One end of the internal ignition pipeline 34 is close to the flame of the permanent light 14. The natural gas inlet pipeline 32 is equipped with a pressure sensor 3, a regulating valve 3, and a solenoid valve 3. The compressed air inlet pipeline 33 is equipped with a pressure sensor 4, a solenoid valve 4, and a regulating valve 4. The pressure sensor 3, the regulating valve 3, the solenoid valve 3, the pressure sensor 4, the solenoid valve 4, and the regulating valve 4 are all electrically connected to the controller.

[0030] It also includes a high-altitude ignition system, which includes a natural gas inlet pipe 2 39. The natural gas inlet pipe 2 39 is connected to the ignition gun fuel gas pipe 40. The ends of both the natural gas inlet pipe 2 39 and the ignition gun fuel gas pipe 40 are close to the flame of the permanent light 14. Both the natural gas inlet pipe 2 39 and the ignition gun fuel gas pipe 40 are equipped with flame arresters. The ignition gun fuel gas pipe 40 is equipped with a shut-off valve, which is electrically connected to the controller.

[0031] Working Process: Gas venting branch pipes from external units are connected to the company's low-pressure gas main network. Gas enters the system via low-pressure gas pipeline 4 and flows into gas condensate collection tank 1. Under normal circumstances, the valve from low-pressure gas pipeline 4 to gas condensate collection tank 1 is normally open, the nitrogen valve on the top of tank 1 is normally closed, and the condensate outlet valve on the top of the tank is normally closed. During inspections, the condensate level in gas condensate collection tank 1 is observed using the local glass plate level gauge 26. When the condensate level in gas condensate collection tank 1 reaches a high value, the valve from low-pressure gas pipeline 4 to gas condensate collection tank 1 is closed. The valve of the gas condensate collection tank 1 is opened to pressurize the tank by opening the low-pressure nitrogen inlet valve on the tank top low-pressure nitrogen inlet pipeline 5. After the pressure inside the tank reaches 0.5MPa, the low-pressure nitrogen valve is closed and the condensate outlet valve on the tank top is opened. Under the action of nitrogen pressure, the condensate in the tank enters the low-pressure gas main condensate pipeline 6 and then enters the separator 2 for oil, gas and water separation. The purpose is to further remove the liquid carried by the gas and prevent the high-pressure flare from being ignited by the gas carrying the condensate oil during the ignition process, and falling to the ground under gravity, causing the "fire rain" phenomenon. The separator 2 is equipped with a dehydration bag to further separate the condensate oil and acidic water in the condensate. The sulfur-containing wastewater in the dehydration bag is pumped to the sulfur unit by the acidic water pump through the sulfur-containing wastewater desulfurization device pipeline 24, while the condensate oil is pumped to the condensate oil tank through the condensate oil to condensate oil tank pipeline 23. A defoaming screen is installed at the gas phase outlet inside the separator 2. Before entering the water seal tank 7, the gas in the separator 2 passes through the defoaming screen to intercept any condensate that may be carried in the gas phase, further reducing the phenomenon of gas carrying liquid. The gas enters the water seal tank 7 below the water seal liquid level, which helps prevent backfire. If backfire occurs, the flame entering the water seal tank 7 through the flare gas outlet is prevented from spreading further because the inlet pipe is below the water surface. An overflow port is installed on one side of the water seal tank 7. The overflow port is connected to an overflow pipe 9 equipped with a control valve. The control valve and the water seal tank 7 liquid level form a control loop. The overflow port control valve controls the water seal liquid level in the water seal tank 7, stabilizing the low-pressure gas pipeline network pressure while also providing a certain pressure to the flare system, maintaining a constant system pressure. Under normal circumstances, the water level in the water seal tank 7 should be at least 1.5 times the operating pressure above the gas inlet. Meanwhile, the water level in water seal tank 7 must not be too high, otherwise it may cause pressure buildup in the low-pressure gas pipeline network 4, affecting the gas release of various devices. A water seal tank replenishment pipeline 11 is installed on the top of water seal tank 7, and a control regulating valve is installed on the water seal tank replenishment pipeline 11. The control regulating valve and the water seal tank level form a control loop. In addition, the overflow port on one side of water seal tank 7 and the replenishment valve on the water seal tank replenishment pipeline 11 can be used together to separate the small amount of condensed oil floating on the water surface of water seal tank 7, further removing oil from the gas. The water and oil overflowing from the overflow port of water seal tank 7 enter the separator 2 in front of water seal tank 7 for oil-water separation.A drain pipe is installed at the bottom of water seal tank 7 to drain the water stored in water seal tank 7 during system maintenance. A low-pressure nitrogen inlet pipe is installed at the top of water seal tank 7. This low-pressure nitrogen inlet pipe is equipped with a one-way valve and a control regulating valve. The regulating valve and the pressure at the top of the water seal tank form a control loop. By purging the flare system with a small flow of nitrogen, the system is isolated from air to prevent backfire during flare ignition. A defoaming screen is installed at the gas outlet at the top of the water seal tank to further reduce liquid carryover in the gas entering the flare system.

[0032] After exiting from the top of the water seal tank 7, the gas passes through the flame arrester 21 (one for use and one for backup, facilitating daily switching and maintenance) before entering the flare tube 3. When the released gas reaches the flare head 13 through the flare tube 3, it is ignited by the continuous light 14 at the flare head 13. To prevent excessive smoke during combustion, smoke-extinguishing steam is installed on the flare head 13, and the amount of smoke-extinguishing steam is controlled by the opening of the ground smoke-extinguishing steam regulating valve. A molecular seal 16 is installed near the flare head 13 in the flare tube 3. Low-pressure nitrogen enters the molecular seal 16 after passing through the gate valve and the flow-limiting orifice plate, maintaining a small flow rate for purging to ensure that air does not flow back into the flare tube 3 after the gas release is interrupted, preventing backfire or explosion during subsequent release. A drain valve (double valve) and drain pipe 18 are installed at the bottom of the flare tube 3 to promptly discharge any small amount of water carried into the flare tube 3 by the gas, as well as rainwater that falls into the flare tube 3 during rain or snow. The discharged wastewater enters a wastewater tank and then flows through underground sewage pipes into a wastewater treatment plant.

[0033] The ground-based flare ignition system uses internal flame propagation ignition, which involves mixing depressurized natural gas and depressurized and dried compressed air in a specific ratio within the combustion chamber. When the mixture reaches the deflagration range, the controller's high-energy semiconductor nozzle generates a spark through high-voltage discharge within the combustion chamber, igniting the deflagration gas. The flame from this gas travels through an internal ignition tube to the pilot light, igniting it. The high-altitude ignition system uses electric spark ignition, which delivers depressurized natural gas to the ignition gun head and ignites it electronically. The ignition gun then ignites the pilot light 14 at the flare head 13. After the pilot light has been running stably for 300 seconds, the shut-off valve on the ignition gun's fuel gas pipeline automatically closes, while the pilot light continues to burn. After the pilot light 14 is ignited, the flame monitoring device 19 detects the flame and transmits the signal to the controller via an instrument line. Furthermore, a high-definition monitoring camera is installed at the flare site, allowing for real-time monitoring of the flare's combustion status by pointing the camera at the flare outlet.

[0034] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and all such modifications or substitutions should be within the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A gas condensate recovery and flare system, characterized in that, It includes a gas condensate collection tank (1), a separator (2), a flare tube (3), and a controller; The gas condensate collection tank (1) is connected to a low-pressure gas pipeline network (4), a low-pressure nitrogen inlet pipeline (5), and a low-pressure gas main condensate pipeline (6). The gas condensate collection tank (1) is equipped with a pressure sensor (25) and a local glass plate level gauge (26). The ends of the low-pressure gas pipeline (4) and the low-pressure gas main condensate pipeline (6) are both connected to the separator (2); The separator (2) is connected to the water seal tank (7) via a pipeline; the gas condensate collection tank (1), separator (2) and water seal tank (7) are all equipped with heat tracing pipelines; the water seal tank (7) and separator (2) are also connected by a drain pipeline (8) and an overflow pipeline (9); the water seal tank (7) is equipped with a pressure sensor II, a low-pressure nitrogen inlet pipeline II (10), a water seal tank water supply pipeline (11) and a gas outlet pipeline (12), the low-pressure nitrogen inlet pipeline II (10) is equipped with a check valve and a control regulating valve, and the control regulating valve and pressure sensor II are electrically connected to the controller; The separator (2) is equipped with a dehydration bag; The separator (2) is connected to the sulfur removal device pipeline (24), the condensate oil to condensate oil tank pipeline (23), and the gas to gas holder pipeline (30). The gas to gas holder pipeline (30) is connected in sequence to the gas holder (41), compressor (37), buffer tank (38), and purification device (42). The purification device (42) is connected to the fuel gas pipeline network through the pipeline. The water seal tank (7) is connected to the flare tube (3) through the gas outlet pipe (12). The top of the flare tube (3) is equipped with a flare head (13), the flare head (13) is equipped with a night light (14) and a smoke-extinguishing steam inlet pipe (15), the smoke-extinguishing steam inlet pipe (15) is equipped with a smoke-extinguishing steam regulating valve, the smoke-extinguishing steam regulating valve is electrically connected to the controller, the top of the flare tube (3) is equipped with a molecular seal (16) below the flare head (13), the flare tube (3) is connected to a low-pressure nitrogen inlet pipe (17), the bottom of the flare tube (3) is equipped with a sewage pipe (18), the sewage pipe (18) is connected to an external sewage tank; The torch tube (3) is equipped with a flame detector (19), which is electrically connected to the controller.

2. The gas condensate recovery and flare system as described in claim 1, characterized in that, Both the separator (2) and the water seal tank (7) are equipped with defoaming screens (20).

3. The gas condensate recovery and flare system as described in claim 1, characterized in that, A flame arrester (21) is installed on the gas outlet pipeline (12).

4. The gas condensate recovery and flare system as described in claim 1, characterized in that, A flow-limiting orifice plate (22) is installed in the low-pressure nitrogen inlet pipeline (17).

5. The gas condensate recovery and flare system as described in claim 1, characterized in that, The molecular seal (16) is equipped with a steam tracing pipeline.

6. The gas condensate recovery and flare system as described in claim 1, characterized in that, The separator (2) is equipped with a local glass plate level gauge 2 (27), a local glass plate level gauge 3 (36), a level sensor (35) and a boundary sensor (28). The boundary sensor (28) and the level sensor (35) are electrically connected to the controller.

7. The gas condensate recovery and flare system as described in claim 1, characterized in that, It also includes a ground flare ignition system, which includes a combustion chamber (31). The combustion chamber (31) is connected to a natural gas inlet pipeline (32), a compressed air inlet pipeline (33), and an internal ignition pipeline (34). One end of the internal ignition pipeline (34) is close to the flame of the permanent light (14). The natural gas inlet pipeline (32) is equipped with a pressure sensor, a regulating valve, and a solenoid valve. The compressed air inlet pipeline (33) is equipped with a pressure sensor, a solenoid valve, and a regulating valve. The pressure sensor, the regulating valve, the solenoid valve, the pressure sensor, the solenoid valve, and the regulating valve are all electrically connected to the controller.

8. The gas condensate recovery and flare system as described in claim 1, characterized in that, It also includes a high-altitude ignition system, which includes a second natural gas inlet pipe (39), which is connected to an ignition gun fuel gas pipe (40). The ends of both the second natural gas inlet pipe (39) and the ignition gun fuel gas pipe (40) are close to the flame of the permanent lamp (14). Both the second natural gas inlet pipe (39) and the ignition gun fuel gas pipe (40) are equipped with flame arresters. The ignition gun fuel gas pipe (40) is equipped with a shut-off valve, which is electrically connected to the controller.

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