Special-shaped micro-premixing burner for pure hydrogen combustion

Abstract

The special-shaped micro-premixing combustor comprises a gas inlet part, a premixing assembly and a combustion chamber assembly, the gas inlet part is of a barrel-shaped structure with one end open, and a first fuel gas inlet communicating with a containing cavity is formed in the side wall of the barrel-shaped structure; the premixing assembly is connected with the air inlet part and provided with a second containing cavity and a third containing cavity, a nozzle with a rectangular section is arranged at the end, away from the air inlet part, of the second containing cavity, and a connecting part is arranged on the end face of the end, away from the air inlet part, of the premixing assembly; the combustion chamber assembly is connected with the premixing assembly through a connecting part and arranged around the nozzle, and at least one part of the combustion chamber assembly is made of transparent materials. By arranging the rectangular single-nozzle structure, the average flow speed of hydrogen / air mixed gas can be effectively increased, the phenomenon that a combustor is burnt down due to hydrogen flame tempering is prevented, the mixing pipe adopts a mixing mode of air jet flow and cross flow of hydrogen, a local high-temperature area can be avoided, and NOx emission can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of burners, and in particular to a special-shaped micro-premix burner for pure hydrogen combustion. Background Art

[0002] Gas turbines are highly efficient and clean power machinery, and are by far the most efficient heat-to-power conversion power generation equipment. In order to meet the needs of lower nitrogen oxide emissions and reduce carbon emissions, the development of gas turbines shows a trend of low emissions, high parameters, and flexible fuel operation. An effective way to achieve low carbon emissions is to use hydrogen-rich fuels for combustion. The use of hydrogen-rich fuels can increase the peak temperature of the gas and achieve higher parameter operation of the gas turbine. However, high gas temperatures will increase NOx emissions and there is a risk of flashback. Therefore, the existing widely used swirl lean premixed combustion technology can no longer fully adapt to these new changes, and it is necessary to develop new combustion organization technologies for hydrogen-rich fuels.

[0003] Although some premixed burners already exist in the prior art, the combustion used in the prior art either cannot achieve ranged mixing of the fuel, increasing the local equivalence ratio at the outlet, causing high NOx emissions; or the internal overall mixing structure is large, and once flashback occurs when burning hydrogen-rich or pure hydrogen fuels, there will be extremely high safety risks.

[0004] Therefore, the prior art has problems of poor combustion emissions and unstable flames caused by uneven mixing in pure hydrogen fuel micro-premixed combustion. Summary of the invention

[0005] The main purpose of the present invention is to provide a special-shaped micro-premixed burner for pure hydrogen combustion to solve the problems of poor combustion emissions and unstable flame caused by uneven mixing in the pure hydrogen fuel micro-premixed combustion in the prior art in the related art.

[0006] In order to achieve the above object, according to one aspect of the present invention, a special-shaped micro-premixed burner for pure hydrogen combustion is provided, comprising:

[0007] An air inlet portion, wherein the air inlet portion is a cylindrical structure with one end open, the cylindrical structure is formed with a first accommodating cavity for accommodating fuel gas, and a first fuel air inlet port communicating with the accommodating cavity is arranged on a side wall of the cylindrical structure;

[0008] A premixing assembly, the premixing assembly is connected to the air inlet, the premixing assembly is provided with a second accommodating chamber and a third accommodating chamber, a first air inlet is provided on the side wall of the third accommodating chamber, a second fuel inlet in gas communication with the first accommodating chamber is provided at one end of the second accommodating chamber, a second air inlet is provided on the side wall of the second accommodating chamber, a nozzle with a rectangular cross section is provided at one end of the second accommodating chamber away from the air inlet, and a connecting portion is provided on the end surface of the end of the premixing assembly away from the air inlet;

[0009] A combustion chamber assembly is connected to the premixing assembly via the connecting portion and is arranged around the nozzle. At least a portion of the combustion chamber assembly is made of a transparent material.

[0010] Further, the premix assembly comprises:

[0011] An air cavity, wherein the air cavity is a cylindrical structure with openings at both ends, the first air inlet is arranged on a side wall of the cylindrical structure, and one end of the air cavity close to the air inlet is connected to the air inlet;

[0012] A mixed gas cavity, the mixed gas cavity comprises a mixing tube, a sealing portion and a base, wherein the mixing tube is sleeved inside the air cavity and connected to the base and the sealing portion, the third accommodating cavity is formed between the mixing tube and the air cavity, the base is connected to one end of the air cavity away from the air inlet portion and seals one end opening of the air cavity, the sealing portion is located in the air cavity and seals the third accommodating cavity.

[0013] Furthermore, the length of the mixing tube is greater than the length of the air cavity; and / or the mixing tube is made by machining and welding of high heat-resistant stainless steel.

[0014] Furthermore, the nozzle is arranged to protrude from the surface of the base.

[0015] Further, the first air inlets are provided with two, and the two first air inlets are symmetrically arranged at a circumferential interval of 180 degrees; and / or, the first fuel inlets are provided with two, and the two first fuel inlets are symmetrically arranged at a circumferential interval of 180 degrees; and / or, the second air inlets are provided with two, and the two second air inlets are symmetrically arranged at a circumferential interval of 180 degrees.

[0016] Furthermore, the second air inlet is a keyway-type air jet hole with a rectangular cross-section.

[0017] Furthermore, the combustion chamber assembly comprises:

[0018] A bracket, wherein a plurality of brackets are provided, and two clamping grooves are provided on the bracket;

[0019] The side wall has a plurality of side walls, and both ends of the side wall are respectively clamped in the clamping grooves, and are connected in sequence head to tail.

[0020] Furthermore, the side wall is made of high-transmittance quartz glass.

[0021] Furthermore, the cross-section of the air cavity is circular, and the cross-section of the mixing tube is rectangular.

[0022] Furthermore, the second air inlet is arranged on the side where the long side of the rectangular cross-section of the mixing tube is located.

[0023] Furthermore, the air inlet is connected to the air cavity via a flange, and the air cavity is connected to the base via a flange.

[0024] By applying the technical solution of the present invention, by setting a rectangular single nozzle structure, the average flow rate of hydrogen / air mixed fuel gas can be effectively increased, and the phenomenon of burner burning caused by hydrogen flame flashback can be prevented. At the same time, the mixing tube adopts a mixing mode of air jet cross-flow hydrogen, which improves the uniformity of hydrogen / air fuel gas mixing, avoids the occurrence of local high temperature areas, and can effectively reduce NOx emissions. At the same time, the mixing tube adopts a rectangular cross-section, the air jet hole is designed on the long side of the rectangle, and the air jets along the short side, which can effectively reduce the penetration distance, and can significantly increase the internal turbulence intensity, effectively promote mixing, and effectively reduce NOx emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It shows a schematic structural diagram of a special-shaped micro-premix burner for pure hydrogen combustion according to the present invention;

[0027] Figure 2 A cross-sectional view of a special-shaped micro-premix burner for pure hydrogen combustion according to the present invention is shown;

[0028] Figure 3 A cross-sectional view of an air inlet portion of a special-shaped micro-premix burner for pure hydrogen combustion according to the present invention is shown;

[0029] Figure 4 A cross-sectional view of an air cavity of a special-shaped micro-premix burner for pure hydrogen combustion according to the present invention is shown;

[0030] Figure 5 A top view of a special-shaped micro-premix burner for pure hydrogen combustion according to the present invention is shown;

[0031] Figure 6 A cross-sectional view of a mixed gas cavity of a special-shaped micro-premixed burner for pure hydrogen combustion according to the present invention is shown.

[0032] The above drawings include the following reference numerals:

[0033] 10. Air intake portion; 11. First accommodating chamber; 12. First fuel air inlet; 20. Premixing assembly; 21. Second accommodating chamber; 211. Second air inlet; 212. Second fuel air inlet; 213. Nozzle; 22. Third accommodating chamber; 221. First air inlet; 23. Air cavity; 24. Mixing gas cavity; 241. Mixing tube; 242. Sealing portion; 243. Base; 25. Connecting portion; 30. Combustion chamber assembly; 31. Bracket; 32. Side wall. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0037] In order to solve the problems of poor combustion emissions and unstable flames caused by uneven mixing in pure hydrogen fuel micro-premixed combustion in the prior art, the present application provides a special-shaped micro-premixed burner for pure hydrogen combustion.

[0038] like Figures 1 to 6 As shown, the first embodiment of the present application provides a special-shaped micro-premix burner for pure hydrogen combustion, the special-shaped micro-premix burner for pure hydrogen combustion, comprising an air intake portion 10, a premixing assembly 20 and a combustion chamber assembly 30, wherein the air intake portion 10 is a cylindrical structure with an opening at one end, the cylindrical structure is formed with a first accommodating cavity 11 for accommodating fuel gas, and a first fuel air inlet 12 connected to the accommodating cavity is provided on the side wall of the cylindrical structure, and gas fuel, such as hydrogen, can enter the first accommodating cavity 11 through the first fuel air inlet 12; the premixing assembly 20 is connected to the air intake portion 10, and the premixing assembly 20 is provided with a second accommodating cavity 21 and a first accommodating cavity 22. Three accommodating chambers 22, wherein the second accommodating chamber 21 is used to mix the gas fuel with the air, and the third accommodating chamber 22 is used to accommodate air, and a first air inlet 221 is provided on the side wall of the third accommodating chamber 22, and a second fuel inlet 212 is provided at one end of the second accommodating chamber 21 to communicate with the first accommodating chamber 11, and a second air inlet 211 is provided on the side wall of the second accommodating chamber 21, and air can enter the third accommodating chamber 22 through the first air inlet 221, and enter the second accommodating chamber 21 through the second air inlet 211, and mix with the gas fuel entering from the second fuel inlet 212. A nozzle 213 with a rectangular cross section is provided at one end of the second accommodating chamber 21 away from the air inlet 10, and the mixed fuel mixer can be sprayed out from the nozzle 213.

[0039] A connecting portion 25 is provided on the end surface of the premixing component 20 away from the air intake portion 10, wherein the connecting portion 25 may be, for example, a groove; the combustion chamber component 30 is connected to the premixing component 20 via the connecting portion 25 and is arranged around the nozzle 213, and at least a portion of the combustion chamber component 30 is made of a transparent material.

[0040] The pure hydrogen fuel shaped nozzle 213 micro premixed burner provided by the present application can effectively improve the average flow rate of the hydrogen / air mixed gas by setting a rectangular single nozzle 213 structure, and prevent the phenomenon of burner burning caused by hydrogen flame flashback. At the same time, the mixing tube 241 adopts a mixing mode of air jet cross-flow hydrogen, which improves the uniformity of hydrogen / air gas mixing, avoids the occurrence of local high temperature areas, and can effectively reduce NOx emissions. At the same time, the mixing tube 241 adopts a rectangular cross-section, and the air jet hole is designed on the long side of the rectangle. The air jet flows along the short side, which can effectively reduce the penetration distance, and can significantly increase the internal turbulence intensity, effectively promote mixing, and effectively reduce NOx emissions.

[0041] Furthermore, if Figure 2 As shown, the premixing assembly 20 includes an air cavity 23 and a mixed gas cavity 24, wherein the air cavity 23 is a cylindrical structure with openings at both ends, the first air inlet 221 is arranged on the side wall of the cylindrical structure, and the end of the air cavity 23 close to the air inlet part 10 is connected to the air inlet part 10; the mixed gas cavity 24 includes a mixing tube 241, a sealing part 242 and a base 243, wherein the mixing tube 241 is sleeved inside the air cavity 23 and connected to the base 243 and the sealing part 242, the third accommodating cavity 22 is formed between the mixing tube 241 and the air cavity 23, the base 243 is connected to the end of the air cavity 23 away from the air inlet part 10, and seals the opening of one end of the air cavity 23, the sealing part 242 is located in the air cavity 23, and seals the third accommodating cavity 22.

[0042] The sealing portion 242 is extended outwardly along the outer wall of the mixing tube 241 to separate hydrogen and air. Such an arrangement can prevent explosion in the event of flashback in the burner. The thickness of the sealing portion 242 may be, for example, 3 mm.

[0043] Preferably, the mixing tube 241 is wrapped around the center of the air inlet 10 and the air cavity 23, so as to stabilize the flow field structure inside the burner, maintain uniform temperature distribution inside the combustion cavity, and improve the service life of the burner. The mixing tube 241 can be made of high heat-resistant stainless steel by machining and welding, for example, made of 306 stainless steel.

[0044] Furthermore, the length of the mixing tube 241 is greater than the length of the air cavity 23; thus, after the mixing tube 241 and the air cavity 23 are assembled, one end of the mixing tube 241 can continue to extend into the first accommodating cavity 11. Such a structural arrangement is more conducive to the gas fuel entering the second accommodating cavity 21 through the second fuel inlet 212 located at one end of the mixing tube 241.

[0045] In order to facilitate the control of combustion, Figure 6 As shown, the nozzle 213 is arranged to protrude from the surface of the base 243 to form a raised lip structure, wherein the thickness of the base 243 can be, for example, 3 mm, the wall thickness of the mixing tube 241 is 1.2 mm, and the height of the raised lip can be, for example, 2 mm, which is beneficial to the control of combustion and also helps to reduce the impact of high temperature on the base 243 during the combustion process.

[0046] In order to further improve the uniformity of gas mixing, two first air inlets 221 are provided, and the two first air inlets 221 are symmetrically arranged at a circumferential interval of 180 degrees. The first air inlet 221 is located in the middle of the air cavity 23, and air can enter the third accommodating cavity 22 simultaneously through the two first air inlets 221. Two first fuel inlets 12 are provided, and the two first fuel inlets 12 are symmetrically arranged at a circumferential interval of 180 degrees. Hydrogen can enter the first accommodating cavity 11 simultaneously from the two opposite first fuel inlets 12; two second air inlets 211 are provided, and the two second air inlets 211 are symmetrically arranged at a circumferential interval of 180 degrees, that is, the two second air inlets 211 are respectively located on the two opposite sides of the mixing tube 241. Such an arrangement can produce a symmetrical flow field structure in a cavity with a smaller space, making the flame more stable.

[0047] Furthermore, the second air inlet 211 is a keyway type air jet hole with a rectangular cross-section. For example, the second air inlet 211 can be a keyway type air jet hole with a width of 6 mm and a radius of 1 mm. Such an arrangement is more conducive to increasing the air jet range and promoting the mixing of air and hydrogen.

[0048] In another specific embodiment of the present application, the combustion chamber assembly 30 includes a bracket 31 and a side wall 32, wherein the bracket 31 is provided in plurality and two snap-in grooves are provided on the bracket 31; the side wall 32 has plurality, and both ends of the side wall 32 are respectively snap-into the snap-in grooves, and are connected in sequence head to tail.

[0049] Preferably, four brackets 31 are provided, and four side walls 32 are provided. The side walls 32 are of a rectangular structure, and the ends of the four side walls 32 are connected in sequence to form a combustion chamber with a rectangular cross-section. During use, the bottoms of the brackets 31 and the side walls 32 are respectively inserted into the grooves of the base 243 of the mixing tube 241, and are sealed with the base 243 of the mixing tube 241, thereby providing a hot atmosphere in the combustion field for stable pure hydrogen fuel combustion.

[0050] In order to facilitate multi-parameter laser diagnosis, the side wall 32 is made of high-transmittance quartz glass. When performing multi-parameter laser diagnosis, the high-transmittance quartz glass can ensure the penetration of pulsed laser. The height of the bracket 31 can be 40 mm, for example, and the size of the high-transmittance quartz glass can be 40 mm*19 mm*2.8 mm.

[0051] Furthermore, the cross-section of the air cavity 23 is circular, the cross-section of the mixing tube 241 is rectangular, and the second air inlet 211 is arranged on the side where the long side of the rectangle of the cross-section of the mixing tube 241 is located. By arranging the air jet holes on the long side of the rectangle, the air is jetted along the short side, which can effectively reduce the penetration distance and significantly improve the internal turbulence intensity, effectively promote mixing, and reduce NOx emissions.

[0052] In order to facilitate installation, the air inlet 10 is connected to the air cavity 23 by a flange, and the air cavity 23 is connected to the base 243 by a flange. Specifically, the air inlet 10 cavity is a cylindrical cavity with a radius of 10 mm and a height of 15 mm, with a wall thickness of 1.5 mm. The outer edge size of the flange used for fixing is 27 mm, and 6 m2 threaded holes are evenly distributed along a circle with a radius of 23 mm on the outer edge of the flange for fixing with the air cavity 23. The air cavity 23 is a cylindrical cavity with a radius of 10 mm and a height of 90 mm, with a wall thickness of 1.5 mm, and the lower flange size is 27 mm. 6 m2 threaded holes are evenly distributed along a circle with a radius of 23 mm on the outer edge of the flange for fixing with the air inlet 10. The outer edge size of the upper flange of the air cavity 23 is 100 mm, and 6 m2 threaded holes are evenly distributed along a circle with a radius of 80 mm for fixing with the base 243.

[0053] During use of the pure hydrogen fuel shaped nozzle 213 micro-premix burner provided in the present application, air enters the air cavity from the first air inlet 221 at the top of the burner, and then flows freely into the mixing tube 241 under pressure; the fuel enters the first accommodating cavity 11 from the bottom, and naturally enters the mixing tube 241 under pressure. This mixing mode is a model of cross-flow of air jet hydrogen, which can effectively increase the air flow velocity at the outlet through a small diameter. In order to meet the needs of small-scale combustion of the micro-premix burner, the overall assembly structure of the burner is 72.5mm long, of which the length of the mixing tube 241 is 58.5mm. This distance is designed to be longer in order to obtain the law of change of hydrogen mixing uniformity with mixing distance. In the study of the influence of different parameters on the mixing effect, the cross-sectional size of the rectangular mixing nozzle 213 used is 6.67mm*3mm, and the outlet cross-sectional area is about 20mm 2 The small diameter can effectively increase the air flow velocity at the outlet and effectively avoid backfire. The combustion chamber wall is made of high-transparency quartz glass, which is convenient for PIV measurement. After installing high-transparency glass, the burner outlet is connected to the atmosphere, and the experiment is carried out under normal pressure.

[0054] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0055] 1. Effectively solve the problems of poor combustion emissions and unstable flame caused by uneven mixing in pure hydrogen fuel micro-premixed combustion in existing technologies;

[0056] 2. It can reduce the penetration distance, significantly increase the turbulence intensity, and facilitate installation and PIV measurement.

[0057] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0058] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0059] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A special-shaped micro-premix burner for pure hydrogen combustion, characterized in that: include: An air intake portion (10), the air intake portion (10) being a cylindrical structure with one end open, the cylindrical structure being provided with a first accommodating cavity (11) for accommodating fuel gas, and a first fuel air intake port (12) communicating with the accommodating cavity being provided on a side wall of the cylindrical structure; A premixing assembly (20), the premixing assembly (20) being connected to the air intake portion (10), the premixing assembly (20) being provided with a second accommodating chamber (21) and a third accommodating chamber (22), a first air inlet (221) being provided on a side wall of the third accommodating chamber (22), a second fuel inlet (212) being provided at one end of the second accommodating chamber (21) and being in gaseous communication with the first accommodating chamber (11), a second air inlet (211) being provided on a side wall of the second accommodating chamber (21), a nozzle (213) having a rectangular cross section being provided at one end of the second accommodating chamber (21) away from the air intake portion (10), and a connecting portion (25) being provided on an end surface of the end of the premixing assembly (20) away from the air intake portion (10); A combustion chamber assembly (30), wherein the combustion chamber assembly (30) is connected to the premixing assembly (20) via the connecting portion (25) and is arranged around the nozzle (213); at least a portion of the combustion chamber assembly (30) is made of a transparent material.

2. The special-shaped micro-premix burner for pure hydrogen combustion according to claim 1, characterized in that: The premixing assembly (20) comprises: An air cavity (23), the air cavity (23) being a cylindrical structure with openings at both ends, the first air inlet (221) being arranged on a side wall of the cylindrical structure, and one end of the air cavity (23) close to the air inlet portion (10) being connected to the air inlet portion (10); A mixed gas cavity (24), the mixed gas cavity (24) comprising a mixing tube (241), a sealing portion (242) and a base (243), wherein the mixing tube (241) is sleeved inside the air cavity (23) and connected to the base (243) and the sealing portion (242), the third accommodating cavity (22) is formed between the mixing tube (241) and the air cavity (23), the base (243) is connected to one end of the air cavity (23) away from the air inlet portion (10), and seals one end opening of the air cavity (23), and the sealing portion (242) is located in the air cavity (23) and seals the third accommodating cavity (22).

3. The special-shaped micro-premix burner for pure hydrogen combustion according to claim 2, characterized in that: The length of the mixing tube is greater than the length of the air cavity (23); and / or the mixing tube (241) is made of high heat-resistant stainless steel by machining and welding.

4. The special-shaped micro-premix burner for pure hydrogen combustion according to claim 2, characterized in that: The nozzle (213) is arranged to protrude from the surface of the base (243).

5. The special-shaped micro-premix burner for pure hydrogen combustion according to claim 1, characterized in that: There are two first air inlets (221), and the two first air inlets (221) are symmetrically arranged at a circumferential interval of 180 degrees; and / or there are two first fuel inlets (12), and the two first fuel inlets (12) are symmetrically arranged at a circumferential interval of 180 degrees; and / or there are two second air inlets (211), and the two second air inlets (211) are symmetrically arranged at a circumferential interval of 180 degrees.

6. The special-shaped micro-premix burner for pure hydrogen combustion according to claim 1, characterized in that: The second air inlet (211) is a keyway-type air jet hole with a rectangular cross section.

7. The special-shaped micro-premix burner for pure hydrogen combustion according to claim 1, characterized in that: The combustion chamber assembly (30) comprises: A bracket (31), wherein a plurality of brackets (31) are provided, and two clamping grooves are provided on the bracket (31); The side wall (32) comprises a plurality of side walls (32), and both ends of the side wall (32) are respectively clamped in the clamping grooves, and are connected in sequence head to tail.

8. The special-shaped micro-premix burner for pure hydrogen combustion according to claim 7, characterized in that: The side wall (32) is made of high-transmittance quartz glass.

9. The special-shaped micro-premix burner for pure hydrogen combustion according to claim 2, characterized in that: The cross section of the air cavity (23) is circular, and the cross section of the mixing tube (241) is rectangular.

10. The special-shaped micro-premix burner for pure hydrogen combustion according to claim 9, characterized in that: The second air inlet (211) is arranged on the side where the long side of the rectangular cross-section of the mixing tube (241) is located.

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