A non-premixed combustor capable of simultaneously generating an oxidizing environment and a reducing environment

Abstract

The application discloses a non-premixed combustor capable of simultaneously generating oxidation environment and reduction environment and relates to the technical field of combustors.The combustor comprises an oxidation gas cavity cover plate, an oxidation gas cavity I, an oxidation gas cavity II, a fuel gas cavity I, a fuel gas cavity II, a gas fuel pipe group and a center powder feeding pipe and the like modules, can simultaneously generate oxidation environment and reduction environment, and can flexibly replace different types of optical windows, flexibly adjust flame intensity and flexibly adjust the length of the center powder feeding pipe extending out of the oxidation gas cavity cover plate, is a non-premixed combustor capable of simultaneously generating oxidation environment and reduction environment, and has the advantages of simple and compact structure, safe and convenient operation, high flexibility and stable planar flame generation.

Description

Technical Field

[0001] This invention relates to the field of burner technology, and in particular to a non-premixed burner capable of simultaneously generating oxidizing and reducing environments. Background Technology

[0002] As the main equipment for studying combustion reaction mechanisms, small planar flame burners are used to generate high-temperature planar flames, thereby generating different high-temperature environments and flue gas environments with different components to simulate the combustion environment of pulverized coal in a real boiler furnace. How the burner is designed determines the degree to which its experimental results closely approximate the combustion in a real boiler furnace.

[0003] Currently, flat-flame burners are widely recognized for their particle heating rate, similar to that of a real furnace, and their ability to flexibly adjust flue gas composition and temperature. The most representative types are the premixed McKenna flat-flame burner (hereinafter referred to as the McKenna burner) and the non-premixed Hencken flat-flame burner (hereinafter referred to as the Hencken burner). The McKenna burner mainly consists of a porous honeycomb burner plate, a premixed gas chamber, a protective gas chamber, and cooling pipes. It can produce a stable flat flame, but its structure is relatively complex and carries the risk of backfire. Therefore, to ensure safety, the burner plate diameter is usually small, typically 4-6 cm, resulting in lower thermal power. The Hencken burner, while inheriting the advantage of providing a stable high-temperature environment from the McKenna burner, adopts a non-premixed design, avoiding the risk of backfire. Because the flat flame is a certain distance from the burner plate, the arrangement of cooling pipes is eliminated, making the overall structure simpler and safer. Furthermore, the burner plate diameter of the Hencken burner is no longer constrained, making it a preferred choice for researchers to design and use for studying combustion reaction mechanisms.

[0004] Currently, Hencken burners are designed with a higher particle heating rate in mind. When the burner is running, the flat flame above the entire furnace can only provide one type of high-temperature flue gas with a constant composition at a time. However, in a real tangential boiler, the combustion environment of pulverized coal is often not a single atmosphere. On the fire-facing side, pulverized coal is in a reducing atmosphere, while on the back-fire side, it is in an oxidizing atmosphere. The oxygen concentrations of the two atmospheres are different, and the existing Hencken burners have not been able to simulate this operating condition.

[0005] Furthermore, Hencken burners often use honeycomb ceramic plates to fix the gas fuel pipe. These honeycomb ceramic plates are mostly made using a sintering method, resulting in insufficient consistency and uniformity in nozzle size and distribution, which can affect the gas flow field. Additionally, transparent windows used for optical measurements are mainly of two types: square and circular, each with its own advantages and disadvantages. Square windows can avoid measurement errors caused by optical path differences when the laser is tilted or the incident position is deviated. However, square windows need to be attached to a steel frame structure. Compared to circular windows, square windows can only use two sets of optical methods for measurement simultaneously. Due to the steel frame structure, their heat dissipation rate is faster, and stress concentration occurs. Circular windows do not have stress concentration, and their heat preservation effect is better than that of square windows at the same thickness. They can also use multiple optical measurement methods simultaneously, ensuring that all measurement data come from the same set of operating conditions, increasing data accuracy. However, when using circular windows, if the laser incident position is deviated, it can easily cause measurement errors. Also, because circular windows have a curved structure, the captured flame images need to be corrected. Existing Hencken burners often only have a recess for a single mounting window, which does not allow for flexible replacement of the optical window during measurement. Furthermore, the uniform high-temperature flue gas field generated by the mixing and combustion of fuel gas and oxidizing gas above the furnace plate is often located a distance from the furnace plate. This distance changes with the feed gas velocity, but current Hencken burners cannot flexibly adjust the height of the central pulverized coal feed pipe extending from the furnace plate, affecting the accuracy of the experiments.

[0006] Therefore, this application proposes a non-premixed burner that can simultaneously generate oxidizing and reducing environments. Summary of the Invention

[0007] The purpose of this invention is to provide a non-premixed burner that can simultaneously generate oxidizing and reducing environments, thus solving the technical problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a non-premixed burner capable of simultaneously generating an oxidizing environment and a reducing environment, comprising an oxidizing chamber cover plate, wherein the oxidizing chamber cover plate has several through holes; an oxidizing chamber shell is fixedly connected to the lower end of the oxidizing chamber cover plate; a sealing gasket is provided between the oxidizing chamber cover plate and the oxidizing chamber shell; an upper fuel chamber flange and a lower fuel chamber flange are provided below the oxidizing chamber shell, and the oxidizing chamber shell, the upper fuel chamber flange, and the lower fuel chamber flange are fixedly connected by bolts; a sealing gasket is provided between the oxidizing chamber shell and the upper fuel chamber flange; and a sealing gasket is provided between the upper fuel chamber flange and the lower fuel chamber flange. An opening is provided at the upper end of the flange of the fuel gas chamber, and the opening end is located inside the outer shell of the oxidation gas chamber. A fuel gas chamber cover plate is fixedly connected to the upper opening of the upper flange of the fuel gas chamber. A sealing gasket two is provided between the fuel gas chamber cover plate and the upper flange of the fuel gas chamber. The fuel gas chamber cover plate has a through hole two. An oxidation gas chamber is formed between the oxidation gas chamber cover plate, the outer shell of the oxidation gas chamber, the upper flange of the fuel gas chamber, and the fuel gas chamber cover plate. An oxidation gas chamber partition plate is provided inside the oxidation gas chamber. The oxidation gas chamber is divided into oxidation gas chamber one and oxidation gas chamber two by the oxidation gas chamber partition plate. The oxidation gas chamber partition plate is located on the lower side of the oxidation gas chamber cover plate, the inner side of the outer shell of the oxidation gas chamber, the upper side of the fuel gas chamber cover plate, the inner side of sealing gasket one, the outer side of sealing gasket two, and the outer side of the upper flange of the fuel gas chamber. The central through hole of the oxidizing chamber baffle separates the central powder feed pipe from the oxidizing chamber. A fuel chamber is formed between the fuel chamber cover, the upper fuel chamber flange, and the lower fuel chamber flange. The fuel chamber is divided into fuel chamber one and fuel chamber two by the fuel chamber baffle. The fuel chamber baffle is connected to the lower side of the fuel chamber cover, the inner side of sealing gasket two, the inner side of the upper fuel chamber flange, the inner side of sealing gasket four, and the inner side of the lower fuel chamber flange. A fuel chamber baffle is installed inside the fuel chamber, and the central through hole of the baffle separates the central powder feed pipe from the fuel chamber. A gas fuel pipe assembly is installed inside the oxidizing chamber shell, and several oxidizing chamber gas delivery pipes are fixedly connected to the outer wall of the oxidizing chamber shell. The gas delivery pipe of the oxidizing chamber is connected to the outer shell of the oxidizing chamber. Several of the oxidizing chamber gas delivery pipes are arranged symmetrically around the center of the oxidizing chamber outer shell, and the extension line of the oxidizing chamber gas delivery pipe does not pass through the center of the oxidizing chamber outer shell. The oxidizing chamber one and oxidizing chamber two, which are equally divided, are each arranged with the same number of oxidizing chamber gas delivery pipes. Several fuel chamber gas delivery pipes are fixedly connected to the outer wall of the lower flange of the fuel chamber. The fuel chamber gas delivery pipes are connected to the lower flange of the fuel chamber. Several of the fuel chamber gas delivery pipes are arranged symmetrically around the center of the lower flange of the fuel chamber, and the extension line of the fuel chamber gas delivery pipe does not pass through the center of the lower flange of the fuel chamber. The oxidizing chamber one and fuel chamber two are each arranged with the same number of fuel chamber gas delivery pipes.

[0009] Preferably, the gas fuel tube assembly consists of approximately 800 gas fuel tubes, each with an inner diameter of 0.8 mm and a wall thickness of 0.2 mm, arranged in an equilateral triangle with a center-to-center distance of 3 mm between tubes. The upper end of each gas fuel tube passes through a first through hole and extends above the oxidizing chamber cover plate. The inner diameter of the first through hole is larger than the outer diameter of the gas fuel tube. The lower end of each gas fuel tube passes through a second through hole on the fuel chamber cover plate and extends below the fuel chamber cover plate. A limiting sleeve is fixedly connected to the outer wall of each gas fuel tube. The limiting sleeve is located below the fuel chamber cover plate, and its upper surface abuts against the lower end of the fuel chamber cover plate. The first through hole on the fuel chamber cover plate and the gas fuel tube are sealed with high-temperature sealant.

[0010] Preferably, two wire meshes are provided between the outer shell of the oxidation chamber and the upper flange of the fuel chamber. The two wire meshes are located on both sides of the oxidation chamber partition and are fixedly connected to the sidewalls of the oxidation chamber partition. The outer and inner ends of the wire meshes are fixedly connected to the adjacent sidewalls of the outer shell of the oxidation chamber and the upper flange of the fuel chamber, respectively. Two wire meshes are provided inside the upper flange of the fuel chamber. The two wire meshes are located on both sides of the fuel chamber partition and are fixedly connected to the sidewalls of the fuel chamber partition. The outer and inner ends of the wire meshes are fixedly connected to the sidewalls of the fuel chamber partition. The side end is fixedly connected to the inner wall of the upper flange of the fuel gas chamber. Several rectifying steel balls are arranged below the first and second steel wire meshes. The connection between the oxidizing gas chamber gas supply pipe and the outer shell of the oxidizing gas chamber, and the connection between the fuel gas chamber gas supply pipe and the lower flange of the fuel gas chamber are located below the first and second steel wire meshes, respectively. At the same time, the connection between the oxidizing gas chamber gas supply pipe and the outer shell of the oxidizing gas chamber, and the connection between the fuel gas chamber gas supply pipe and the lower flange of the fuel gas chamber, are all equipped with partition steel wire meshes to prevent the rectifying steel balls from entering the gas supply pipe and escaping from the gas supply pipe.

[0011] Preferably, a central pulverized coal feed pipe is provided below the lower flange of the fuel gas chamber. The inner diameter of the central pulverized coal feed pipe is 2.5 mm. The upper end of the central pulverized coal feed pipe passes through the lower flange of the fuel gas chamber, the fuel gas chamber partition, the fuel gas chamber cover, the oxidation chamber partition, and the oxidation chamber cover in sequence. The upper end of the central pulverized coal feed pipe extends above the oxidation chamber cover. The central pulverized coal feed pipe is located at the center of the gas fuel pipe assembly.

[0012] Preferably, the central powder feed pipe is provided with an external threaded groove one and an external threaded groove two. The external threaded groove one is threadedly connected to the fuel gas chamber cover plate, and the external threaded groove two is threadedly connected to the lower side wall of the fuel gas chamber lower flange. The external threaded groove one and the external threaded groove two have the same threaded groove size. The outer diameter of the upper end and the middle unthreaded groove position of the central powder feed pipe are both smaller than the outer diameter of the external threaded groove one and the external threaded groove two.

[0013] Preferably, the upper end of the oxidation chamber cover is provided with a square sealing groove and a circular sealing groove, the square sealing groove and the circular sealing groove are partially overlapped, and both the square sealing groove and the circular sealing groove are located on the outside of the gas fuel pipe assembly.

[0014] Compared with related technologies, the non-premixed combustion method provided by the present invention, which can simultaneously generate oxidizing and reducing environments, has the following beneficial effects:

[0015] 1. This invention provides a non-premixed burner capable of simultaneously generating oxidizing and reducing environments. The oxidizing chamber is divided into two chambers by an oxidizing chamber baffle. The oxidizing chamber baffle is connected to the lower side of the oxidizing chamber cover, the inner side of the oxidizing chamber shell, the upper and outer sides of the fuel chamber cover, the inner side of sealing gasket one, the outer side of sealing gasket two, and the outer side of the fuel chamber upper flange. The through hole in the center of the oxidizing chamber baffle nests the central pulverized coal feed pipe, separating the central pulverized coal feed pipe from the oxidizing chamber. All connections are sealed with high-temperature sealant, ensuring that the oxidizing chamber is evenly divided while also ensuring... The gas in each of the two chambers will not escape into the other chamber. The fuel gas chamber is divided into two chambers by a fuel gas chamber baffle. The fuel gas chamber baffle is connected to the lower side of the fuel gas chamber cover, the inner side of the second sealing gasket, the inner side of the upper flange of the fuel gas chamber, the inner side of the fourth sealing gasket, and the inner side of the lower flange of the fuel gas chamber. The through hole in the center of the fuel gas chamber baffle is nested around the central pulverized coal feed pipe, separating the central pulverized coal feed pipe from the fuel gas chamber. All connections are sealed with high-temperature sealant, ensuring that the fuel gas chamber is evenly divided while preventing the gas in one chamber from escaping into the other. Each chamber is equipped with the same number of gas supply lines. The gases of different components in the four chambers are mixed evenly and then transported to the top of the oxidizing chamber cover for mixed ignition, thereby simultaneously generating an oxidizing atmosphere and a reducing atmosphere.

[0016] 2. This invention provides a non-premixed burner capable of simultaneously generating oxidizing and reducing environments. The gas fuel pipe adopts a design that is thinner at the top and thicker at the bottom. The outer diameter of the upper end is smaller than the inner diameter of the through hole one on the oxidizing chamber cover plate. This ensures that the fuel gas (methane, hydrogen, carbon monoxide, a mixture of combustible and non-combustible gases, etc.) flows in the gas fuel pipe, while the oxidizing gas flows in the gap between the gas fuel pipe and the through hole one, thereby forming a non-premixed planar flame above the oxidizing chamber cover plate. The outer diameter of the upper end of the gas fuel pipe is the same as the inner diameter of the through hole two on the fuel chamber cover plate, and the outer diameter of the limiting sleeve is larger than the inner diameter of the through hole two. This ensures that the gas fuel pipe is not blown out of the burner when the high-speed gas flow enters the pipe. The gas fuel pipe is fixed to the through hole two on the fuel chamber cover plate with high-temperature sealant, which can block the flow of gas from the fuel chamber into the oxidizing chamber and fix the gas fuel pipe to prevent it from falling off, ensuring that the fuel gas and oxidizing gas do not premix inside the burner.

[0017] 3. This invention provides a non-premixed burner that can simultaneously generate oxidizing and reducing environments. Oxidizing gas enters the outer shell of the oxidizing chamber through the oxidizing gas chamber gas delivery pipe. After being rectified by rectifying steel balls and steel wire mesh, turbulence and vortices may still exist. Moreover, the horizontal velocity component of the oxidizing gas is relatively large in the outer shell of the oxidizing chamber. When it flows through the through hole in the oxidizing chamber cover plate, its own turbulence and vortices can be eliminated to the greatest extent, so that the oxidizing gas is transported to the top of the oxidizing chamber cover plate in a laminar flow state, thereby ensuring the stability of the planar flame field.

[0018] 4. This invention provides a non-premixed burner that can simultaneously generate oxidizing and reducing environments. The non-premixed burner has high safety. The non-premixed gas mixes and burns above the oxidizing chamber cover. Since the gas fuel pipe extends above the oxidizing chamber cover, and the formed spherical flame is a certain distance away from the gas fuel pipe opening, the flame will be a certain height above the oxidizing chamber cover, so the temperature of the oxidizing chamber cover will not be too high. Therefore, the oxidizing chamber cover does not require a cooling device, making its structure simpler. Another point is that, since this design only allows fuel gas (methane, hydrogen, carbon monoxide, a mixture of combustible and non-combustible gases, etc.) to flow in the gas fuel pipe, it ensures that there is no risk of backfire or even explosion during use, thereby improving the safety of the device.

[0019] 5. This invention provides a non-premixed burner that can simultaneously generate oxidizing and reducing environments. Because the gaseous fuel pipe that transports fuel gas (methane, hydrogen, carbon monoxide, a mixture of combustible and non-combustible gases, etc.) has a small inner diameter and thin wall, it is prone to bending, which affects the formation of planar flame. Therefore, this solution differs from other planar flame burners. By increasing the height of the fuel gas chamber cover, the length of the gaseous fuel pipe can be shortened, minimizing the possibility of bending.

[0020] 6. This invention provides a non-premixed burner that can simultaneously generate oxidizing and reducing environments. The outer diameter of the upper part of the central pulverized coal feed pipe is slightly smaller than the inner diameter of the hole at the center of the oxidizing chamber cover plate, which can prevent stress deformation caused by high temperature environment. The central pulverized coal feed pipe is provided with an external thread groove one and an external thread groove two, which are consistent with the size of the internal thread at the center hole of the fuel chamber cover plate. While fixing the central pulverized coal feed pipe, it can also ensure its sealing. At the same time, because the height of the stable and uniform high temperature flue gas generated by the planar flame will change under different gas flow rates and different gas ratios, it is necessary to flexibly adjust the upper end of the central pulverized coal feed pipe to be level with the stable high temperature flue gas. That is, in this invention, the height of the central pulverized coal feed pipe extending into the combustion chamber can be flexibly adjusted by rotating the central pulverized coal feed pipe.

[0021] 7. This invention provides a non-premixed burner capable of simultaneously generating oxidizing and reducing environments. It can have multiple gas delivery types, one of which involves fuel gas flowing in a gas fuel pipe and oxidizing gas flowing in the gap between the gas fuel pipe and the through hole; the other involves fuel gas and non-combustible gas flowing in the gap between the gas fuel pipe and the through hole, and pure oxygen flowing in the gas fuel pipe. Both gas delivery schemes can form a stable planar flame. The former involves pure fuel gas burning in an oxygen-containing atmosphere, resulting in a lower flame intensity, while the latter involves fuel gas and non-combustible gas burning in pure oxygen, resulting in a more intense flame. When exploring the MILD combustion mechanism, due to the lower required afterflame oxygen concentration, the latter combustion scheme can suppress the formation of soot in the flame. By adjusting the gas delivery type and the proportion of oxygen in the oxidizing gas, planar flames of different intensities can be flexibly obtained. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle;

[0024] Figure 3 This is a three-dimensional structural diagram of the present invention from another angle;

[0025] Figure 4 This is a schematic diagram of the exploded structure of the present invention;

[0026] Figure 5 This is a cross-sectional three-dimensional structural diagram of the present invention;

[0027] Figure 6 This is a three-dimensional cross-sectional view of a partial structure of the present invention;

[0028] Figure 7 This is a three-dimensional structural diagram of the gas fuel pipe of the present invention;

[0029] Figure 8 This is a schematic diagram of the three-dimensional structure of the central powder feeding pipe of the present invention;

[0030] Figure 9 This is a three-dimensional structural diagram of the oxidation chamber cover plate of the present invention;

[0031] Figure 10 This is a three-dimensional structural diagram of the fuel gas chamber cover plate of the present invention;

[0032] Figure 11 This is a partial structural diagram of the oxidation chamber location in this invention;

[0033] Figure 12 This is a schematic diagram of the cross-sectional structure of the fuel gas chamber location in this invention.

[0034] In the diagram: 1. Oxidation chamber cover plate; 2. Sealing gasket one; 3. Gas fuel pipe assembly; 4. Fuel gas chamber cover plate; 5. Sealing gasket two; 6. Wire mesh one; 7. Oxidation chamber outer shell; 8. Oxidation chamber gas delivery pipe; 9. Central powder supply pipe; 10. Wire mesh two; 11. Sealing gasket three; 12. Fuel gas chamber upper flange; 13. Sealing gasket four; 14. Fuel gas chamber lower flange; 15. Fuel gas chamber gas delivery pipe; 16. Gas fuel pipe; 17. Limiting sleeve; 18. External thread groove one; 19. External thread groove two; 20. Square sealing groove; 21. Circular sealing groove; 22. Through hole one; 23. Through hole two; 24. Rectifying steel ball; 25. Oxidation chamber partition plate; 26. Fuel gas chamber partition plate; 27. Oxidation chamber one; 28. Fuel gas chamber one; 29. ​​Oxidation chamber two; 30. Fuel gas chamber two. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0036] Please see Figure 1-12This invention provides a technical solution: a non-premixed burner capable of simultaneously generating oxidizing and reducing environments, comprising an oxidizing chamber cover plate 1, with a plurality of through holes 22 on the oxidizing chamber cover plate 1, an oxidizing chamber shell 7 fixedly connected to the lower end of the oxidizing chamber cover plate 1, a sealing gasket 2 disposed between the oxidizing chamber cover plate 1 and the oxidizing chamber shell 7, a fuel chamber upper flange 12 and a fuel chamber lower flange 14 disposed below the oxidizing chamber shell 7, and the oxidizing chamber shell 7, the fuel chamber upper flange 12 and the fuel chamber lower flange 14 fixedly connected by bolts, a sealing gasket 11 disposed between the oxidizing chamber shell 7 and the fuel chamber upper flange 12, and a sealing gasket disposed between the fuel chamber upper flange 12 and the fuel chamber lower flange 14. Part 4, flange 12 of the fuel gas chamber has an opening at its upper end, and the opening is located inside the outer shell 7 of the oxidation chamber. A fuel gas chamber cover 4 is fixedly connected to the upper opening of the fuel gas chamber flange 12. A sealing gasket 25 is provided between the fuel gas chamber cover 4 and the fuel gas chamber flange 12. The fuel gas chamber cover 4 has a through hole 23. An oxidation chamber is formed between the oxidation chamber cover 1, the outer shell 7 of the oxidation chamber, the upper flange 12 of the fuel gas chamber, and the fuel gas chamber cover 4. An oxidation chamber partition 25 is provided inside the oxidation chamber, dividing the oxidation chamber into oxidation chamber one 27 and oxidation chamber two 29. The oxidation chamber partition 25 is connected to the lower side of the oxidation chamber cover 1, the inner side of the oxidation chamber outer shell 7, the upper side and the outer side of the fuel gas chamber cover 4, and the sealing gasket 29. The inner side of gasket 12, the outer side of sealing gasket 25, and the outer side of the upper flange 12 of the fuel gas chamber are connected. The through hole in the center of the oxidation chamber baffle 25 separates the central powder feed pipe 9 from the oxidation chamber. A fuel gas chamber is formed between the fuel gas chamber cover plate 4, the upper flange 12 of the fuel gas chamber, and the lower flange 14 of the fuel gas chamber. A fuel gas chamber baffle 26 is provided inside the fuel gas chamber, which is divided into fuel gas chamber 1 28 and fuel gas chamber 2 30 by the fuel gas chamber baffle 26. The fuel gas chamber baffle 26 is connected to the lower side of the fuel gas chamber cover plate 4, the inner side of sealing gasket 25, the inner side of the upper flange 12 of the fuel gas chamber, the inner side of sealing gasket 4 13, and the inner side of the lower flange 14 of the fuel gas chamber. The through hole in the center of the fuel gas chamber baffle 26 separates the central powder feed pipe 9 from the fuel gas chamber. The outer shell 7 of the oxidation chamber... A gas fuel pipe assembly 3 is provided on the inner side. Several oxidation chamber gas supply pipes 8 are fixedly connected to the outer wall of the oxidation chamber shell 7. The oxidation chamber gas supply pipes 8 are connected to the oxidation chamber shell 7. The several oxidation chamber gas supply pipes 8 are arranged symmetrically around the center position of the oxidation chamber shell 7, and the extension line of the oxidation chamber gas supply pipes 8 does not pass through the center position of the oxidation chamber shell 7. The equally divided oxidation chamber 1 27 and oxidation chamber 2 29 are each arranged with the same number of oxidation chamber gas supply pipes 8. Several fuel chamber gas supply pipes 15 are fixedly connected to the outer wall of the fuel chamber lower flange 14. The fuel chamber gas supply pipes 15 are connected to the fuel chamber lower flange 14. The several fuel chamber gas supply pipes 15 are arranged symmetrically around the center position of the fuel chamber lower flange 14.Furthermore, the extension line of the fuel gas chamber supply pipe 15 does not pass through the center position of the lower flange 14 of the fuel gas chamber; both fuel gas chamber one 28 and fuel gas chamber two 30 are equipped with the same number of fuel gas chamber supply pipes 15.

[0037] The gas fuel tube assembly 3 consists of approximately 800 gas fuel tubes 16. Each gas fuel tube 16 has an inner diameter of 0.8 mm and a wall thickness of 0.2 mm, arranged in an equilateral triangle. The center-to-center distance between tubes is 3 mm. The upper end of each gas fuel tube 16 passes through a through-hole 22 and extends above the oxidation chamber cover plate 1. The resulting spherical flame remains a certain distance from the inlet of the gas fuel tube 16, ensuring that the temperature of the oxidation chamber cover plate 1 does not become too high. Therefore, this design eliminates the need for cooling water, simplifying the overall structure. Furthermore, in this design, only gaseous fuels (methane, hydrogen, carbon monoxide, mixtures of combustible and non-combustible gases, etc.) flow through the gas fuel tubes 16, ensuring that the invention will not experience backfire or even explosion during operation, thereby improving the safety of the device. The inner diameter of the through-hole 22 is larger than the outer diameter of the gas fuel tube 16. The lower end of the gas fuel pipe 16 passes through the second through hole 23 on the fuel gas chamber cover plate 4 and extends to the bottom of the fuel gas chamber cover plate 4. A limiting sleeve 17 is fixedly connected to the outer wall of the gas fuel pipe 16. The limiting sleeve 17 is located below the fuel gas chamber cover plate 4, and the upper surface of the limiting sleeve 17 abuts against the lower end of the fuel gas chamber cover plate 4. The through hole 22 on the fuel gas chamber cover plate 4 and the gas fuel pipe 16 are sealed with high-temperature sealant. Since the gas fuel pipe 16, which transports fuel gas, has a small inner diameter and thin wall, it is prone to bending, which affects the formation of planar flame. Therefore, unlike other planar flame burners, this solution increases the height of the fuel gas chamber cover plate 4, which can shorten the length of the gas fuel pipe 16 and limit the lower end of the gas fuel pipe 16 by increasing the height of the fuel gas chamber cover plate 4, thus minimizing the possibility of bending.

[0038] Two wire meshes 6 are installed between the outer shell 7 of the oxidation chamber and the upper flange 12 of the fuel chamber. The two wire meshes 6 are located on both sides of the oxidation chamber partition 25 and are fixedly connected to the side walls of the oxidation chamber partition 25. The outer and inner ends of the wire meshes 6 are fixedly connected to the adjacent side walls of the outer shell 7 of the oxidation chamber and the upper flange 12 of the fuel chamber, respectively. Two wire meshes 10 are installed on the inner side of the upper flange 12 of the fuel chamber. The two wire meshes 10 are located on both sides of the fuel chamber partition 26 and are fixedly connected to the side walls of the fuel chamber partition 26. The outer ends of the wire meshes 10 are fixedly connected to the inner side wall of the upper flange 12 of the fuel chamber. Several rectifier steel balls 24 are installed below both wire meshes 6 and 10. The connection between the oxidation chamber gas supply pipe 8 and the oxidation chamber outer shell 7, and the connection between the fuel chamber gas supply pipe 15 and the lower flange 14 of the fuel chamber are also provided. The connection points are located below the steel wire mesh 16 and the steel wire mesh 20, respectively. The oxidizing gas enters the outer shell 7 of the oxidizing gas chamber through the oxidizing gas chamber gas supply pipe 8. After being rectified by the rectifying steel ball 24 and the steel wire mesh, turbulence and vortices may still exist. Moreover, the horizontal velocity component of the oxidizing gas in the outer shell 7 of the oxidizing gas chamber is relatively large. The oxidizing gas chamber cover plate 1 is made of a thickness of not less than 30 mm to ensure that it provides a sufficiently long channel when flowing in the through hole 22 on the oxidizing gas chamber cover plate 1, thereby eliminating its own turbulence and vortices, so that the oxidizing gas is transported to the oxidizing gas chamber cover plate 1 in a laminar flow state to ensure the stability of the planar flame field. At the same time, the connection points between the oxidizing gas chamber gas supply pipe 8 and the outer shell 7 of the oxidizing gas chamber, as well as the connection points between the fuel gas chamber gas supply pipe 15 and the fuel gas chamber lower flange 14, are all equipped with isolation steel wire mesh to prevent the rectifying steel ball 24 from entering the gas supply pipe and escaping from the gas supply pipe.

[0039] A central pulverized coal feed pipe 9 is installed below the lower flange 14 of the fuel gas chamber. The inner diameter of the central pulverized coal feed pipe 9 is 2.5 mm. The upper end of the central pulverized coal feed pipe 9 passes through the lower flange 14 of the fuel gas chamber, the fuel gas chamber partition 26, the fuel gas chamber cover plate 4, the oxidation chamber partition 25, and the oxidation chamber cover plate 1 in sequence. The upper end of the central pulverized coal feed pipe 9 extends above the oxidation chamber cover plate 1. The central pulverized coal feed pipe 9 is located at the center of the gas fuel pipe assembly 3. The central pulverized coal feed pipe 9 is provided with an external thread groove 18 and an external thread groove 19. The external thread groove 18 is threaded to the fuel gas chamber cover plate 4, and the external thread groove 19 is threaded to the lower side wall of the lower flange 14 of the fuel gas chamber. The thread groove dimensions of the external thread groove 18 and the external thread groove 19 are the same. The outer diameter of the end and the middle unthreaded groove position is smaller than the outer diameter of the external thread groove 18 and external thread groove 29. The outer diameter of the upper part of the central powder feed pipe 9 is slightly smaller than the inner diameter of the hole at the center of the oxidation chamber cover plate 1, which can prevent stress deformation caused by high temperature environment. The external thread groove 18 and external thread groove 29 are consistent with the size of the internal thread at the center hole of the fuel chamber cover plate 4, which can fix the central powder feed pipe 9 while ensuring its sealing. At the same time, because the height of the stable and uniform high temperature flue gas generated by the planar flame will change under different gas flow rates and different gas ratios, it is necessary to flexibly adjust the upper end of the central powder feed pipe 9 to be level with the stable high temperature flue gas. That is, rotating the central powder feed pipe 9 can flexibly adjust the height of the central powder feed pipe 9 extending into the combustion chamber.

[0040] The upper end of the oxidation chamber cover plate 1 is provided with a square sealing groove 20 and a circular sealing groove 21. The square sealing groove 20 and the circular sealing groove 21 are partially overlapped, and both the square sealing groove 20 and the circular sealing groove 21 are located on the outside of the gas fuel pipe assembly 3. In use, the square sealing groove 20 and the circular sealing groove 21 can be flexibly replaced with a circular high-temperature resistant glass window and a square high-temperature resistant glass window as needed. The thickness of the window is slightly less than the thickness of the groove opening to avoid the glass cracking due to the high temperature expansion of the metal and glass.

[0041] Working Principle: During use, the square sealing groove 20 and the round sealing groove 21 can be flexibly replaced with round or square high-temperature resistant glass windows as needed. The thickness of the window is slightly less than the groove thickness to avoid cracking of the glass due to the high-temperature expansion of the metal and glass. The same or different oxidizing gases are input into the first oxidation chamber 27 and the second oxidation chamber 29 through the two oxidation gas chamber gas supply pipes 8. At the same time, the same or different fuel gases are input into the first fuel gas chamber 28 and the second fuel gas chamber 30 through the two fuel gas chamber gas supply pipes 15. Carrying gas and coal powder are input from the central pulverized coal supply pipe 9. The oxidizing gas comes from the gaseous fuel. The flow between pipe 16 and through hole 22 is discharged from the upper end of through hole 22. Fuel is introduced from the lower end of gas fuel pipe 16 and discharged from the upper end of gas fuel pipe 16. Oxidizing gas and fuel gas are mixed and burned on the oxidizing chamber cover plate 1 to form an oxidizing atmosphere and a reducing atmosphere. Pulverized coal is ejected by a high-speed carry-on flow and ignites in the high-temperature flue gas in the oxidizing environment on one side and the reducing environment on the other side. By reducing the oxygen concentration behind the planar flame, the high-speed pulverized coal will be fully diluted and entrained in the furnace, which can form a uniformly radiated MILD combustion.

Claims

1. A non-premixed burner capable of simultaneously generating oxidizing and reducing environments, comprising an oxidizing chamber cover (1), characterized in that: The oxidation chamber cover plate (1) has several through holes (22). The lower end of the oxidation chamber cover plate (1) is fixedly connected to the oxidation chamber shell (7). A sealing gasket (2) is provided between the oxidation chamber cover plate (1) and the oxidation chamber shell (7). A fuel chamber upper flange (12) and a fuel chamber lower flange (14) are provided below the oxidation chamber shell (7). The oxidation chamber shell (7), the fuel chamber upper flange (12), and the fuel chamber lower flange (14) are fixedly connected by bolts. A sealing gasket (11) is provided between the oxidation chamber shell (7) and the fuel chamber upper flange (12). A sealing gasket is provided between the fuel chamber upper flange (12) and the fuel chamber lower flange (14). Fourth (13), the upper end of the upper flange (12) of the fuel gas chamber is opened, and the opening end is located inside the outer shell (7) of the oxidation chamber. A fuel gas chamber cover plate (4) is fixedly connected to the upper end of the upper flange (12). A sealing gasket (5) is provided between the fuel gas chamber cover plate (4) and the upper flange (12). The fuel gas chamber cover plate (4) is provided with a through hole (23). An oxidation chamber is formed between the oxidation chamber cover plate (1), the outer shell (7) of the oxidation chamber, the upper flange (12) of the fuel gas chamber and the fuel gas chamber cover plate (4). An oxidation chamber partition plate (25) is provided in the oxidation chamber. The oxidation chamber is divided into oxidation chamber one (27) and oxidation chamber two (27) by the oxidation chamber partition plate (25). 9), the oxidation chamber baffle (25) is connected to the lower side of the oxidation chamber cover plate (1), the inner side of the oxidation chamber shell (7), the upper and outer sides of the fuel chamber cover plate (4), the inner side of the sealing gasket one (2), the outer side of the sealing gasket two (5), and the outer side of the fuel chamber upper flange (12). The through hole in the center of the oxidation chamber baffle (25) separates the central powder supply pipe (9) from the oxidation chamber. A fuel chamber is formed between the fuel chamber cover plate (4), the fuel chamber upper flange (12), and the fuel chamber lower flange (14). A fuel chamber baffle (26) is provided in the fuel chamber. The fuel chamber is divided into fuel chamber one (28) and fuel chamber two (30) by the fuel chamber baffle (26). The fuel chamber baffle (26) is connected to the fuel chamber cover plate (1) and the outer side of the fuel chamber upper flange (12). 4) The lower side, the inner side of the sealing gasket 2 (5), the inner side of the upper flange (12) of the fuel gas chamber, the inner side of the sealing gasket 4 (13) and the inner side of the lower flange (14) of the fuel gas chamber are connected. The through hole in the center of the fuel gas chamber partition (26) separates the central powder supply pipe (9) from the fuel gas chamber. A gas fuel pipe assembly (3) is provided on the inner side of the oxidation chamber shell (7). Several oxidation chamber gas supply pipes (8) are fixedly connected to the outer wall of the oxidation chamber shell (7). The oxidation chamber gas supply pipes (8) are connected to the oxidation chamber shell (7). Several oxidation chamber gas supply pipes (8) are arranged symmetrically around the center position of the oxidation chamber shell (7), and the extension line of the oxidation chamber gas supply pipes (8) does not pass through the center position of the oxidation chamber shell (7).Both oxidation chamber one (27) and oxidation chamber two (29) are equipped with the same number of oxidation chamber gas supply pipes (8). Several fuel chamber gas supply pipes (15) are fixedly connected to the outer wall of the fuel chamber lower flange (14). The fuel chamber gas supply pipes (15) are connected to the fuel chamber lower flange (14). The several fuel chamber gas supply pipes (15) are arranged symmetrically around the center of the fuel chamber lower flange (14), and the extension lines of the fuel chamber gas supply pipes (15) do not pass through the center of the fuel chamber lower flange (14). Both fuel chamber one (28) and fuel chamber two (30) are equipped with the same number of fuel chamber gas supply pipes (15).

2. A non-premixed burner capable of simultaneously generating oxidizing and reducing environments according to claim 1, characterized in that: The gas fuel tube assembly (3) consists of approximately 800 gas fuel tubes (16). Each gas fuel tube (16) has an inner diameter of 0.8 mm and a wall thickness of 0.2 mm, arranged in an equilateral triangle. The center-to-center distance between any two tubes is 3 mm. The upper end of each gas fuel tube (16) passes through a through hole (22) and extends above the oxidation chamber cover plate (1). The inner diameter of the through hole (22) is larger than the outer diameter of the gas fuel tube (16). The lower end passes through the second through hole (23) on the fuel gas chamber cover plate (4) and extends to the bottom of the fuel gas chamber cover plate (4). A limiting sleeve (17) is fixedly connected to the outer wall of the gas fuel pipe (16). The limiting sleeve (17) is located below the fuel gas chamber cover plate (4), and the upper surface of the limiting sleeve (17) abuts against the lower end of the fuel gas chamber cover plate (4). The through hole (22) on the fuel gas chamber cover plate (4) and the gas fuel pipe (16) are sealed with high-temperature sealant.

3. A non-premixed burner capable of simultaneously generating oxidizing and reducing environments according to claim 2, characterized in that: Two wire meshes (6) are provided between the outer shell (7) of the oxidation chamber and the upper flange (12) of the fuel chamber. The two wire meshes (6) are located on both sides of the oxidation chamber partition (25) and are fixedly connected to the side wall of the oxidation chamber partition (25). The outer and inner ends of the wire meshes (6) are fixedly connected to the adjacent side walls of the oxidation chamber outer shell (7) and the upper flange (12) of the fuel chamber, respectively. Two wire meshes (10) are provided on the inner side of the upper flange (12) of the fuel chamber. The two wire meshes (10) are located on both sides of the fuel chamber partition (26) and are fixedly connected to the side wall of the fuel chamber partition (26). The outer ends of the wire meshes (10) are fixedly connected to the side wall of the fuel chamber partition (26). The end is fixedly connected to the inner wall of the upper flange (12) of the fuel gas chamber. Several rectifying steel balls (24) are provided below the first wire mesh (6) and the second wire mesh (10). The connection between the oxidation gas chamber gas supply pipe (8) and the oxidation gas chamber shell (7) and the connection between the fuel gas chamber gas supply pipe (15) and the lower flange (14) of the fuel gas chamber are located below the first wire mesh (6) and the second wire mesh (10), respectively. At the same time, the connection between the oxidation gas chamber gas supply pipe (8) and the oxidation gas chamber shell (7) and the connection between the fuel gas chamber gas supply pipe (15) and the lower flange (14) of the fuel gas chamber are provided with partition wire mesh to prevent the rectifying steel balls (24) from entering the gas supply pipe and escaping from the gas supply pipe.

4. A non-premixed burner capable of simultaneously generating oxidizing and reducing environments according to claim 1, characterized in that: A central powder feed pipe (9) is provided below the lower flange (14) of the fuel gas chamber. The inner diameter of the central powder feed pipe (9) is 2.5 mm. The upper end of the central powder feed pipe (9) passes through the lower flange (14) of the fuel gas chamber, the fuel gas chamber partition (26), the fuel gas chamber cover plate (4), the oxidation chamber partition (25) and the oxidation chamber cover plate (1) in sequence. The upper end of the central powder feed pipe (9) extends to the top of the oxidation chamber cover plate (1). The central powder feed pipe (9) is located at the center of the gas fuel pipe assembly (3).

5. A non-premixed burner capable of simultaneously generating oxidizing and reducing environments according to claim 4, characterized in that: The central powder feed pipe (9) is provided with an external threaded groove one (18) and an external threaded groove two (19). The external threaded groove one (18) is threadedly connected to the fuel gas chamber cover plate (4), and the external threaded groove two (19) is threadedly connected to the lower side wall of the fuel gas chamber lower flange (14). The threaded grooves of the external threaded groove one (18) and the external threaded groove two (19) are the same size. The outer diameter of the upper end and the middle unthreaded groove position of the central powder feed pipe (9) is smaller than the outer diameter of the external threaded groove one (18) and the external threaded groove two (19).

6. A non-premixed burner capable of simultaneously generating oxidizing and reducing environments according to claim 1, characterized in that: The upper end of the oxidation chamber cover plate (1) is provided with a square sealing groove (20) and a circular sealing groove (21). The square sealing groove (20) and the circular sealing groove (21) are partially overlapped, and both the square sealing groove (20) and the circular sealing groove (21) are located on the outside of the gas fuel pipe assembly (3).

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