Low-nitrogen gas burner suitable for multiple working conditions

Abstract

The utility model discloses a kind of low-nitrogen gas combustor suitable for multiple working conditions, including assembly cylinder, outer fire basin, center fire basin, lifting mechanism, inner layer gas gun, outer layer gas gun and oxygen gun.Assembling cylinder is fixed on heating furnace furnace bottom plate, and its outer wall is connected with the ventilation pipe of air register.Outer fire basin is fixed to the top end of assembly cylinder, and center fire basin can be axially lifted, driven by lifting mechanism.Inner and outer layer gas gun is annular array distribution in the inside and outside of outer fire basin, and oxygen gun is arranged in the inside of center fire basin.By adjusting the height of center fire basin, air combustion, oxygen-enriched combustion and pure oxygen combustion mode can be switched, realize combustion air grading and gas segmented combustion, effectively reduce flame temperature, inhibit nitrogen oxide generation.The combustor is stable in structure, strong in adaptability, and has the advantages of efficient combustion and environmental protection.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, specifically a low-NOx gas burner suitable for multiple operating conditions. Background Technology

[0002] Currently, in response to national and local environmental protection requirements and dual carbon targets, research is underway to further promote pure oxygen-assisted combustion and oxygen-enriched combustion in petrochemical heating furnaces. This aims to reduce total flue gas emissions, greenhouse gas emissions, and heat loss from flue gas, thereby improving furnace thermal efficiency. However, since most heating furnaces are still older models, their burners primarily use air-assisted combustion. Using pure oxygen or oxygen-enriched combustion requires replacing the burners with suitable alternatives. Furthermore, due to the high cost of oxygen production, petrochemical heating furnace users must consider economic factors, especially in the event of oxygen supply failure. To ensure continuous operation, timely switching to air-assisted combustion is necessary. Currently, there are no burner products on the market that can simultaneously operate under pure oxygen, oxygen-enriched, and air-assisted combustion conditions. Utility Model Content

[0003] In view of the above-mentioned shortcomings in the existing technology, the purpose of this utility model is to provide a low-NOx gas burner suitable for multiple operating conditions, which realizes flexible switching between multiple operating conditions, high-efficiency combustion and ultra-low NOx emissions, and has significant environmental and economic value.

[0004] The technical solution adopted by this utility model to achieve the above objectives is: a low-NOx gas burner suitable for multiple working conditions, including an assembly cylinder, an outer fire basin, a central fire basin, a lifting mechanism, an inner gas gun, an outer gas gun, and an oxygen gun.

[0005] The assembly cylinder is fixedly installed on the bottom plate of the heating furnace. The outer wall of the assembly cylinder is connected to a ventilation pipe arranged outside the heating furnace. An air regulating damper is installed on the ventilation pipe. The outer fire basin is fixedly installed on the top of the assembly cylinder and extends into the heating furnace. The central fire basin is arranged at the axis of the assembly cylinder and moves up and down along the axis. The lifting mechanism is assembled in the assembly cylinder and linked with the central fire basin.

[0006] The inner and outer gas guns are both fixedly assembled into the assembly cylinder and are evenly distributed in a ring array. The inner and outer gas guns are respectively arranged on the inner and outer sides of the outer fire basin. The central fire basin is arranged inside the inner gas gun. The oxygen gun is fixedly assembled at the axis of the central fire basin and is arranged inside the port of the central fire basin.

[0007] Based on the above technical solutions, in order to ensure that the central fire basin can be adjusted in conjunction with the outer fire basin to achieve various working conditions, the following technical solutions regarding the central fire basin and the outer fire basin are provided.

[0008] The central fire basin is a hollow cone-shaped structure, and the bottom outer wall of the central fire basin is provided with an outwardly protruding annular baffle. The top of the outer fire basin is provided with a tapered disc, and the interior of the outer fire basin is a conical tube structure that is narrow at the top and wide at the bottom. Horizontal and vertical through holes are respectively opened on the top side wall of the central fire basin and the tapered disc. The horizontal and vertical through holes are arranged in a ring array and distributed around the annular baffle.

[0009] Based on the above technical solutions, in order to ensure that the lifting mechanism can be stably installed in the assembly cylinder and to adjust the lifting posture of the central fire basin, the following technical solutions are provided.

[0010] The lifting mechanism includes a central sleeve, a fixed pressure cap, a threaded sleeve, and a handwheel. An assembly base plate is fixedly connected to the bottom of the assembly cylinder. The central sleeve is slidably inserted into the axis of the assembly base plate and arranged vertically. The central fire basin is fixedly installed to the top of the central sleeve. The oxygen gun is fixedly installed in the central sleeve. The fixed pressure cap is fixedly installed to the outside of the assembly base plate. The threaded sleeve is rotatably installed in the fixed pressure cap and is screwed into the central sleeve. The handwheel is fixedly connected to the threaded sleeve.

[0011] Based on the above technical solutions, in order to ensure that the central fire basin can be stably installed at the top of the central sleeve and that the oxygen gun can be stably installed in the central sleeve, the following technical solutions are provided.

[0012] The top of the central sleeve is provided with a basin support ring plate, and a fixing ring is fixedly connected to the outer edge of the basin support ring plate. The central fire basin is fixedly connected to the upper surface of the basin support ring plate and the inner wall of the fixing ring. The central sleeve is fixedly connected to the basin support ring plate and the fixing ring by a ring array of supporting ribs. A fastening bolt is screwed onto the bottom side wall of the central sleeve, and the fastening bolt abuts against the outer wall of the oxygen gun.

[0013] Based on the above technical solutions, the following technical solutions are provided to ensure the safety of the burner under abnormal conditions.

[0014] A continuously lit lamp is fixedly mounted on the assembly base plate, arranged in a vertical direction, and the continuously lit lamp is arranged inside the central fire basin.

[0015] The beneficial effects of this utility model are:

[0016] 1. Flexible switching between multiple operating conditions to adapt to different combustion needs. The height of the central fire basin can be adjusted by the lifting mechanism, and the gap between the central fire basin and the outer fire basin can be dynamically adjusted to achieve flexible switching between three modes: air-assisted combustion, oxygen-enriched combustion, and pure oxygen-assisted combustion, to meet the needs of different operating conditions.

[0017] 2. Staged combustion and segmented gas supply effectively suppress the formation of nitrogen oxides (NOx). The inner and outer gas guns employ nozzle designs with different angles, allowing the gas to be injected in stages and mixed with the combustion air at designated locations for segmented combustion. This avoids the concentration of flames in high-temperature zones, reducing NOx formation. When injecting gas, the outer gas gun can guide the flue gas from the furnace back to the flame center, further reducing the combustion temperature and enhancing the NOx suppression effect.

[0018] 3. Dynamically adjust the distribution of combustion air to optimize combustion efficiency. By raising and lowering the central fire basin, the flow area of ​​the combustion air is changed, creating high and low velocity zones in air-assisted combustion mode to ensure stable combustion at the flame root. Simultaneously, the combustion air is delivered above the flame to achieve staged combustion. In oxygen-enriched combustion mode, a high-speed oxygen-enriched flow is formed within the central fire basin, mixing and burning with the fuel gas from the outer gas gun at a higher position, preventing excessively high temperatures at the flame root and reducing the formation of nitrogen oxides.

[0019] 4. Pure oxygen combustion is safe and controllable, avoiding high-temperature hotspots. In pure oxygen mode, the central fire basin rises to its highest position, and the annular baffle seals the gap between the outer fire basins. Oxygen is injected only through the oxygen gun, avoiding the risk of backfire due to premature mixing of the combustion gases. The multi-stage injection of the outer gas gun can lengthen the flame and increase radiative heat dissipation. At the same time, it ignites the flue gas in the furnace to reduce the flame temperature, avoiding the increase of nitrogen oxides caused by high temperatures during pure oxygen combustion.

[0020] 5. Energy-saving and environmentally friendly, with a wide range of applications. By optimizing the combustion method, it reduces fuel waste and improves thermal efficiency. It is suitable for various application scenarios such as petrochemicals, industrial heating furnaces, and boilers, meeting stringent environmental protection standards while maintaining combustion stability and extending equipment service life. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model in air-assisted combustion mode;

[0022] Figure 2 This is a schematic diagram of the structure of this utility model in pure oxygen combustion mode;

[0023] Figure 3 This is a schematic diagram of the outer fire pit structure;

[0024] Figure 4 A structural diagram showing the combination of a central fire pit, lifting mechanism, and oxygen gun.

[0025] In the diagram: 1 Assembly cylinder, 11 Ventilation pipe, 12 Air damper, 13 Steel plate flange, 14 Insulation layer, 15 Assembly base plate, 2 Outer fire basin, 21 Closing disc, 22 Horizontal through hole, 23 Vertical through hole, 3 Central fire basin, 31 Annular baffle, 4 Lifting mechanism, 41 Central sleeve, 42 Fixed cover, 43 Threaded sleeve, 44 Handwheel, 45 Support ring plate, 46 Fixed ring, 47 Support rib plate, 48 Fastening bolt, 51 Inner gas gun, 52 Outer gas gun, 6 Oxygen gun, 7 Furnace bottom plate, 8 Constant light. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-4 A low-NOx gas burner suitable for multiple operating conditions includes an assembly cylinder 1, an outer fire basin 2, a central fire basin 3, a lifting mechanism 4, an inner gas gun 51, an outer gas gun 52, and an oxygen gun 6.

[0028] The assembly cylinder 1 is fixedly installed on the furnace bottom plate 7 of the heating furnace. The outer wall of the assembly cylinder 1 is connected to a ventilation pipe 11 arranged outside the heating furnace. An air regulating damper 12 is installed on the ventilation pipe 11. The outer fire basin 2 is fixedly installed on the top of the assembly cylinder 1 and extends into the heating furnace. The central fire basin 3 is arranged at the axis of the assembly cylinder 1 and moves up and down along the axis. The lifting mechanism 4 is installed in the assembly cylinder 1 and is linked with the central fire basin 3.

[0029] The inner gas gun 51 and the outer gas gun 52 are both fixedly assembled into the assembly cylinder 1 and are evenly distributed in a ring array. The inner gas gun 51 and the outer gas gun 52 are respectively arranged on the inner and outer sides of the outer fire basin 2. The central fire basin 3 is arranged on the inner side of the inner gas gun 51. An oxygen gun 6 is fixedly assembled at the axis of the central fire basin 3 and is arranged on the inner side of the port of the central fire basin 3.

[0030] As the main carrier for the installation of other components, the assembly cylinder 1 can be fixedly installed to the furnace bottom plate 7 of the heating furnace through the steel plate flange 13, so that its top extends into the furnace bottom plate 7. In order to prevent the heat of the flame or residual hot air during operation from being conducted to the outer wall of the assembly cylinder 1 and affecting the normal operation of other components or to avoid safety hazards, an insulation layer 14 can be laid inside the assembly cylinder 1.

[0031] The position of the central fire basin 3 is adjusted by the lifting mechanism 4, thereby adjusting the gap between the central fire basin 3 and the outer fire basin 2 to achieve three states: air-assisted combustion, oxygen-enriched combustion, and pure oxygen-assisted combustion. Both the inner gas gun 51 and the outer gas gun 52 nozzles are designed with nozzles at different angles according to fuel grading requirements, allowing the gas to be delivered to the combustion position step by step according to combustion control needs. This allows for segmented combustion with the combustion air at the set positions, effectively controlling the flame temperature and significantly suppressing the formation of nitrogen oxides. The outer gas gun 52 nozzle is located inside the furnace. When it injects gas into the flame center, it can draw a large amount of furnace flue gas into the flame center, reducing the flame temperature and suppressing the formation of nitrogen oxides.

[0032] The damper 12 includes components such as a handle, limit claws, blades, and a rotating shaft. It is installed inside the ventilation pipe 11. When the handle is turned, the blade opening can be adjusted to regulate the amount of combustion air delivered. When pure oxygen combustion is used, the damper 12 is completely closed and has good sealing performance to prevent pure oxygen from flowing back into the ventilation pipe 11.

[0033] To ensure that the central fire basin 3 can be adjusted in conjunction with the outer fire basin 2 to achieve various working conditions, the following technical solutions are provided for the central fire basin 3 and the outer fire basin 2.

[0034] The central fire basin 3 is a hollow cone-shaped structure, and the bottom outer wall of the central fire basin 3 is provided with an outwardly protruding annular baffle 31. The top of the outer fire basin 2 is provided with a tapered disc 21, and the interior of the outer fire basin 2 is a tapered tube structure that is narrow at the top and wide at the bottom. Horizontal through holes 22 and vertical through holes 23 are respectively opened on the top side wall of the central fire basin 3 and the tapered disc 21. The horizontal through holes 22 and vertical through holes 23 are arranged in a ring array and distributed around the annular baffle 31.

[0035] The horizontal through hole 22 and the vertical through hole 23 allow the gas injected by the inner gas gun 51 to mix with the combustion air and be retained, so that the flow rate of the mixer is reduced and the gas burns in the hole.

[0036] When using air-assisted combustion, the lifting mechanism 4 controls the central fire basin 3 to be in a lower position. At this time, the air regulating damper 12 is opened to allow external air to enter through the ventilation duct 11. The outer fire basin 2 and the central fire basin 3 form two flow channels, thus dividing the combustion air into two parts. One part flows out along the cavity inside the central fire basin 3, and the other part flows out along the gap between the central fire basin 3 and the outer fire basin 2. Because the central fire basin 3 has a conical opening, the flow velocity at the outlet of the central fire basin 3 increases as the combustion air flows upwards, while the velocity flowing between the central fire basin 3 and the outer fire basin 2 increases. The relatively low air velocity of the combustion air is conducive to the stable mixing and combustion of the gas supplied by the inner gas gun 51 with the combustion air at the gap between the central fire basin 3 and the outer fire basin 2, and to stabilizing the flame root at the edge of the outer fire basin 2, forming a ring-shaped first-stage flame. The higher outlet velocity of the central fire basin 3 is conducive to the injection of the combustion air to a higher position in the flame center, so that it can mix and burn with the gas supplied by the outer gas gun 52 above the opening of the outer fire basin 2. This achieves the staged combustion of the combustion air and the segmented combustion of the gas, effectively controlling the flame center temperature and suppressing the large-scale generation of nitrogen oxides.

[0037] When oxygen-enriched combustion is used, the central fire basin 3 is gradually adjusted and raised by the lifting mechanism 4. At this time, the flow area between the central fire basin 3 and the outer fire basin 2 is gradually compressed and reduced. The pressure drop of the supplied combustion air is increased by adjusting the damper 12. The combustion air is also divided into two parts. A larger part flows out along the cavity in the central fire basin 3, and a smaller part flows out along the smaller gap between the central fire basin 3 and the outer fire basin 2. Due to the high flow velocity in the central fire basin 3, the oxygen injected by the oxygen gun 6 mixes with the combustion air in the central fire basin 3 to form an oxygen-enriched combustion air, which is then sprayed to a higher position in the center of the burner flame. The inner gas gun 51 injects gas into the gap between the central fire basin 3 and the outer fire basin 2, where it mixes and burns with the combustion air. This stabilizes the flame root at the edge of the outer fire basin 2, forming a ring-shaped primary flame. The oxygen-enriched combustion air injected from the central fire basin 3 mixes and burns with the gas injected from the outer gas gun 52, thus achieving staged combustion air and segmented combustion of fuel gas. By adjusting the height of the central fire basin 3, the oxygen-enriched combustion air can also be distributed, creating combustion reactions of different intensities in the combustion flame area. This achieves distribution control of the combustion flame temperature field, effectively controlling the flame center temperature to suppress the large-scale generation of nitrogen oxides. The primary combustion, using air-assisted combustion, is completed at the ring-shaped edge between the central fire basin 3 and the outer fire basin 2, effectively avoiding the negative impact of high combustion speed and high combustion temperature caused by oxygen-enriched combustion air.

[0038] During pure oxygen-assisted combustion, the lifting mechanism 4 controls the central fire basin 3 to be at its highest position. At this time, the annular baffle 31 of the central fire basin 3 contacts the constricting disc 21 of the outer fire basin 2, and there is no gap between them. Oxygen is directly injected by the oxygen gun 6 into the central fire basin 3 and dispersed, and then injected to the center of the flame above the burner. It mixes and burns with the gas injected by the outer gas gun 52 in the air above the burner. Because the flame temperature of pure oxygen-assisted combustion is high and the combustion reaction is fast, the flame is relatively short. Therefore, the raised central fire basin 3 stabilizes the flame at a higher position. The nozzles on the outer gas gun 52 can be set to multiple stages, and the mixing and combustion are carried out step by step above the burner, so that the flame temperature can be controlled. Meanwhile, the inner gas gun 51 is cut off, the gas supply is no longer provided, and combustion does not occur in the central fire basin 3 to ensure safety. Although theoretically pure oxygen combustion does not involve nitrogen, in practice, nitrogen oxides are still produced at higher combustion temperatures due to the nitrogen elements carried by the fuel gas and the nitrogen carried by pure oxygen. Therefore, this solution elongates the flame of pure oxygen combustion, increases flame radiation heat dissipation, and the outer gas gun 52 can draw a large amount of flue gas from the furnace into the center of the flame, further reducing the flame temperature and effectively suppressing the large-scale generation of nitrogen oxides.

[0039] To ensure that the lifting mechanism 4 can be stably installed in the assembly cylinder 1 and to adjust the lifting posture of the central fire basin 3, the following technical solution is provided.

[0040] The lifting mechanism 4 includes a central sleeve 41, a fixed pressure cover 42, a threaded sleeve 43, and a handwheel 44. An assembly base plate 15 is fixedly connected to the bottom of the assembly cylinder 1. The central sleeve 41 is slidably inserted into the axis of the assembly base plate 15 and arranged in a vertical direction. The central fire basin 3 is fixedly installed on the top of the central sleeve 41. The oxygen gun 6 is fixedly installed in the central sleeve 41. The fixed pressure cover 42 is fixedly installed on the outside of the assembly base plate 15. The threaded sleeve 43 is rotatably installed in the fixed pressure cover 42 and is screwed into the central sleeve 41. The handwheel 44 is fixedly connected to the threaded sleeve 43.

[0041] The outer wall of the central sleeve 41 is provided with external threads to achieve screw connection with the threaded sleeve 43. At the same time, a guide groove is provided along the length direction. The guide groove is slidably inserted with the mounting base plate 15. When the threaded sleeve 43 and the central sleeve 41 are screwed together, they will not be interfered with by the guide groove. The fixed pressure cover 42 can ensure that the threaded sleeve 43 and the handwheel 44 are stably installed on the mounting base plate 15 in a relatively rotating posture. When the handwheel 44 is operated to drive the threaded sleeve 43 to rotate, the central sleeve 41, the central fire basin 3, and the oxygen gun 6 can be driven to rise and fall synchronously in the vertical direction.

[0042] To ensure that the central fire basin 3 can be stably installed at the top of the central sleeve 41 and that the oxygen gun 6 can be stably installed in the central sleeve 41, the following technical solutions are provided.

[0043] The top of the central sleeve 41 is provided with a basin support ring plate 45, and a fixing ring 46 is fixedly connected to the outer edge of the basin support ring plate 45. The central fire basin 3 is fixedly connected to the upper surface of the basin support ring plate 45 and the inner wall of the fixing ring 46. The central sleeve 41 is fixedly connected to the basin support ring plate 45 and the fixing ring 46 through a ring-shaped array of supporting ribs 47. A fastening bolt 48 is screwed onto the bottom side wall of the central sleeve 41, and the fastening bolt 48 is in contact with the outer wall of the oxygen gun 6.

[0044] The arrangement of the basin support plate 45, the fixing ring 46, and the supporting rib plate 47 enables the central fire basin 3 to be stably installed on the top of the central sleeve 41, while the fastening bolt 48 enables the oxygen gun 6 to be effectively installed in the central sleeve 41.

[0045] To ensure the safety of the burner under abnormal conditions, the following technical solutions are provided.

[0046] A continuous light 8 is fixedly mounted on the mounting base plate 15, arranged in a vertical direction, and the continuous light 8 is arranged inside the central fire basin 3.

[0047] The continuous flame lamp 8 is a general-purpose component of the burner. Its function is to provide a small flame at all times during burner operation, ensuring that an open flame remains in the furnace in the event of burner malfunction and extinguishment, thus preventing a flash explosion. The continuous flame lamp 8 passes through the mounting base plate 15 at the bottom of the mounting cylinder 1, with its head extending into the interior of the mounting cylinder 1 and reaching the interior of the central fire basin 3. Its tail is a flexible hose connector, which connects to the gas pipeline of the continuous flame lamp 8 via a metal flexible hose.

[0048] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-NOx gas burner suitable for multiple operating conditions, characterized in that: It includes an assembly cylinder (1), an outer fire basin (2), a central fire basin (3), a lifting mechanism (4), an inner gas gun (51), an outer gas gun (52), and an oxygen gun (6). The assembly cylinder (1) is fixedly installed on the furnace bottom plate (7) of the heating furnace. The outer wall of the assembly cylinder (1) is connected to a ventilation pipe (11) arranged outside the heating furnace. An air regulating damper (12) is installed on the ventilation pipe (11). The outer fire basin (2) is fixedly installed on the top of the assembly cylinder (1) and extends into the heating furnace. The central fire basin (3) is arranged at the axis of the assembly cylinder (1) and moves up and down along the axis. The lifting mechanism (4) is assembled into the assembly cylinder (1) and linked with the central fire basin (3). The inner gas gun (51) and the outer gas gun (52) are both fixedly assembled in the assembly cylinder (1) and are evenly distributed in a ring array. The inner gas gun (51) and the outer gas gun (52) are respectively arranged on the inner and outer sides of the outer fire basin (2). The central fire basin (3) is arranged on the inner side of the inner gas gun (51). The oxygen gun (6) is fixedly assembled at the axis of the central fire basin (3). The oxygen gun (6) is arranged on the inner side of the port of the central fire basin (3).

2. A low-NOx gas burner suitable for multiple operating conditions according to claim 1, characterized in that: The central fire basin (3) is a hollow cone structure, and the bottom outer wall of the central fire basin (3) is provided with an outwardly protruding annular baffle (31). The top of the outer fire basin (2) is provided with a tapered disc (21), and the interior of the outer fire basin (2) is a conical tube structure that is narrow at the top and wide at the bottom. The top side wall of the central fire basin (3) and the tapered disc (21) are respectively provided with horizontal through holes (22) and vertical through holes (23). The horizontal through holes (22) and vertical through holes (23) are arranged in a ring array and distributed around the annular baffle (31).

3. A low-NOx gas burner suitable for multiple operating conditions according to claim 1, characterized in that: The lifting mechanism (4) includes a central sleeve (41), a fixed cover (42), a threaded sleeve (43), and a handwheel (44). The bottom of the assembly cylinder (1) is fixedly connected to an assembly base plate (15). The central sleeve (41) is slidably inserted into the axis of the assembly base plate (15) and arranged in a vertical direction. The central fire basin (3) is fixedly installed on the top of the central sleeve (41). The oxygen gun (6) is fixedly installed in the central sleeve (41). The fixed cover (42) is fixedly installed on the outside of the assembly base plate (15). The threaded sleeve (43) is rotatably installed in the fixed cover (42) and is screwed into the central sleeve (41). The handwheel (44) is fixedly connected to the threaded sleeve (43).

4. A low-NOx gas burner suitable for multiple operating conditions according to claim 3, characterized in that: The top of the central sleeve (41) is provided with a basin ring plate (45), and a fixing ring (46) is fixedly connected to the outer edge of the basin ring plate (45). The central fire basin (3) is fixedly connected to the upper surface of the basin ring plate (45) and the inner wall of the fixing ring (46). The central sleeve (41) is fixedly connected to the basin ring plate (45) and the fixing ring (46) by a support rib plate (47) distributed in a ring array. A fastening bolt (48) is screwed onto the bottom side wall of the central sleeve (41), and the fastening bolt (48) abuts against the outer wall of the oxygen gun (6).

5. A low-NOx gas burner suitable for multiple operating conditions according to claim 3, characterized in that: A continuous lamp (8) arranged in a vertical direction is fixedly mounted on the mounting base plate (15), and the continuous lamp (8) is arranged inside the central fire basin (3).

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