Hydrogen micro-mixing staged combustion can and hydrogen fuel staged combustion chamber

Abstract

The present application relates to hydrogen combustion technical field, provide a kind of hydrogen micro-mixing staging combustion flame tube and hydrogen fuel staging combustion chamber, hydrogen micro-mixing staging combustion flame tube includes micro-mixing shell and the head mixing plate connected to micro-mixing shell, head mixing plate is equipped with concentrically arranged multiple circle combustion hole groups, each circle combustion hole group includes multiple combustion holes;Head mixing plate is arranged with multiple gas supply units inside, each gas supply unit is communicated with the combustion hole of at least one circle combustion hole group;Each gas supply unit is communicated with gas supply pipeline, and gas supply pipeline is provided with control valve.The present application is equipped with concentrically arranged multiple circle combustion hole groups by head mixing plate, and multiple gas supply units are supplied with fuel to multiple circle combustion hole groups, air enters combustion hole and effectively mixes with the fuel jetted to combustion hole by gas supply unit, can realize fuel diffusion combustion, and according to the characteristics of different fuels, the opening and closing of corresponding number of gas supply units are controlled, effectively improve the utilization rate of fuel, while reducing exhaust emission.

Description

Technical Field

[0001] This invention relates to the field of hydrogen combustion technology, and in particular to a hydrogen micro-mixing staged combustion flame tube and a hydrogen fuel staged combustion chamber. Background Technology

[0002] Under the "dual carbon" goal, hydrogen, with its zero carbon emissions and high calorific value, has become a fuel with application potential in the fields of aero-engines and ground gas turbines, and hydrogen combustion technology is an important part of the development of hydrogen fuel gas turbine engines.

[0003] Most existing hydrogen combustion technologies are based on premixed combustion technology, which uses hydrogen and air to be premixed in a microchannel and the mixture is ejected through the same nozzle. However, due to the fast combustion speed and high flame temperature of hydrogen, the fuel cannot be fully burned, resulting in low fuel utilization and high emissions of NOx and other waste gases. Summary of the Invention

[0004] This invention provides a hydrogen micro-mixing staged combustion flame tube and a hydrogen fuel staged combustion chamber to solve the defects of low fuel utilization and high exhaust emissions in the prior art.

[0005] This invention provides a hydrogen micro-mixing staged combustion flame tube, comprising:

[0006] Micro-mixed housing;

[0007] A head mixing plate is connected to the micro-mixing shell, and the head mixing plate and the micro-mixing shell are configured with a mixing cavity; the head mixing plate has a concentric array of multiple rings of combustion holes, each ring of combustion holes including multiple combustion holes;

[0008] The head mixing plate is internally arranged with multiple air supply units, each of which is connected to the combustion holes of at least one ring of combustion holes; each air supply unit is connected to an air supply pipeline, and the air supply pipeline is equipped with a control valve.

[0009] According to an embodiment of the present invention, a hydrogen micro-mixing staged combustion flame tube is provided, wherein the head mixing plate has three rings of combustion holes, and two gas supply units are arranged inside the head mixing plate, namely a duty gas supply unit and a main combustion stage gas supply unit. The duty gas supply unit is connected to the outermost ring of combustion holes, and the main combustion stage unit is connected to the other two rings of combustion holes.

[0010] According to an embodiment of the present invention, a hydrogen micro-mixing staged combustion flame tube is provided, wherein the duty gas supply unit includes a duty gas supply main pipe and a plurality of duty gas connection pipes. The duty gas supply main pipe includes a duty main pipe and at least one duty branch pipe connected to the duty main pipe, and each duty branch pipe is connected to the gas supply pipeline; each combustion hole of the outermost ring combustion hole group is connected to the duty main pipe through a corresponding duty gas connection pipe.

[0011] According to an embodiment of the present invention, a hydrogen micro-mixing staged combustion flame tube is provided. The main combustion stage gas supply unit includes a main combustion stage manifold and a plurality of main combustion stage connecting pipes. The main combustion stage manifold includes a main combustion stage main pipe and at least one main combustion stage branch pipe connected to the main combustion stage main pipe. Each main combustion stage branch pipe is connected to a gas supply pipeline. One end of each main combustion stage connecting pipe is connected to the main combustion stage main pipe, and the other end of the main combustion stage connecting pipe is connected to the combustion holes corresponding to the inner ring combustion hole group and the combustion holes corresponding to the middle ring combustion hole group.

[0012] According to an embodiment of the present invention, a hydrogen micro-mixing staged combustion flame tube is provided, wherein the main combustion stage pipe and the duty stage pipe are both arc-shaped and located on the same circle;

[0013] The main combustion stage main pipe and the duty officer main pipe are in a circular shape. The duty officer main pipe and the main combustion stage main pipe are concentrically arranged from the outside to the inside on the inner side of the main combustion stage branch pipe. The main combustion stage main pipe is located on the outside of the multi-ring combustion hole group. The outer wall of the main combustion stage main pipe has a recessed portion for accommodating the duty officer connecting pipe.

[0014] According to an embodiment of the present invention, a hydrogen micro-mixing staged combustion flame tube is provided, wherein a vortex generator is provided on the inner wall of the combustion hole near the center of the head mixing plate, and a spray hole communicating with a corresponding gas supply unit is opened on the inner wall of the combustion hole, and / or a guide plate is provided on the side of the head mixing plate away from the combustion chamber shell, and a plurality of air inlets are arranged on the guide plate corresponding to the position of the mixing chamber.

[0015] According to an embodiment of the present invention, a hydrogen micro-mixing staged combustion flame tube is provided, wherein the vortex generator has two sides, and two nozzles are formed on the inner wall of the combustion hole, with the two nozzles facing the two sides respectively.

[0016] According to an embodiment of the present invention, a hydrogen micro-mixing staged combustion flame tube is provided, wherein each nozzle of the combustion hole of the outermost ring combustion hole group is connected to the duty supervisor through the duty officer connecting pipe.

[0017] According to an embodiment of the present invention, a hydrogen micro-mixing staged combustion flame tube is provided, wherein each main combustion stage connecting pipe is connected to two first connecting branch pipes in the middle, and the two first connecting branch pipes are respectively connected to the nozzles of two adjacent combustion holes of the middle ring combustion hole group.

[0018] The other end of the main combustion stage connecting pipe has two second connecting branches or one third connecting branch. The two second connecting branches are respectively connected to the two nozzles of the combustion hole corresponding to the inner ring combustion hole group. The third connecting branches of two adjacent main combustion stage connecting pipes are respectively connected to the two nozzles of the combustion hole corresponding to the inner ring combustion hole group.

[0019] The present invention also provides a hydrogen micro-mixing staged combustion chamber, comprising a combustion chamber shell and any one of the above-mentioned hydrogen micro-mixing staged combustion flame tubes, wherein the hydrogen micro-mixing staged combustion flame tube is disposed in the combustion chamber shell.

[0020] The hydrogen micro-mixing staged combustion flame tube provided in this embodiment of the invention has a multi-ring combustion hole group arranged concentrically through a mixing plate at the head, and fuel is supplied to the multi-ring combustion hole group through multiple air supply units. Air enters the combustion hole and mixes effectively with the fuel jetted to the combustion hole by the air supply unit, which can realize fuel diffusion combustion. According to the characteristics of different fuels, the opening and closing of a corresponding number of air supply units can be controlled to effectively improve the fuel utilization rate and reduce the emission of NOx and other exhaust gases. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is one of the structural schematic diagrams of the hydrogen micro-mixing staged combustion flame tube provided in the embodiments of the present invention;

[0023] Figure 2 This is the second schematic diagram of the structure of the hydrogen micro-mixing staged combustion flame tube provided in the embodiment of the present invention;

[0024] Figure 3 This is the third schematic diagram of the structure of the hydrogen micro-mixing staged combustion flame tube provided in the embodiments of the present invention;

[0025] Figure 4 This is the fourth schematic diagram of the structure of the hydrogen micro-mixing staged combustion flame tube provided in the embodiments of the present invention;

[0026] Figure 5This is the fifth schematic diagram of the hydrogen micro-mixing staged combustion flame tube provided in the embodiments of the present invention;

[0027] Figure 6 This is a schematic diagram of the micro-hybrid shell provided in an embodiment of the present invention;

[0028] Figure 7 This is one of the structural schematic diagrams of the guide plate provided in the embodiment of the present invention;

[0029] Figure 8 This is a second schematic diagram of the structure of the guide plate provided in the embodiment of the present invention;

[0030] Figure 9 This is one of the cross-sectional views of the head mixing plate provided in the embodiments of the present invention;

[0031] Figure 10 This is a second cross-sectional view of the head mixing plate provided in an embodiment of the present invention;

[0032] Figure 11 This is one of the structural schematic diagrams of the hydrogen micro-mixing staged combustion chamber provided in the embodiments of the present invention;

[0033] Figure 12 This is the second schematic diagram of the hydrogen micro-mixing staged combustion chamber provided in the embodiments of the present invention;

[0034] Figure 13 This is a schematic diagram of the hydrogen micro-mixing staged combustion chamber provided in an embodiment of the present invention.

[0035] Figure label:

[0036] 1. Baffle plate; 2. Head mixing plate; 3. Flame outer cylinder; 4. Flame inner cylinder; 5. Air inlet; 6. Combustion port; 7. External mixing port; 8. Internal mixing port; 9. Swirl generator; 10. Combustion chamber shell; 101. Combustion chamber outlet; 102. Combustion chamber inlet; 103. Mixing chamber; 104. Outer annular cavity; 105. Inner annular cavity;

[0037] 20. Micro-mixed shell;

[0038] 301. Inner ring combustion hole group; 302. Middle ring combustion hole group; 303. Outer ring combustion hole group;

[0039] 40. Gas supply unit for duty shift; 401. Supervisor for duty shift; 402. Supervisor for duty shift; 403. Connecting pipe for duty shift;

[0040] 50. Main combustion stage gas supply unit; 501. Main combustion stage branch pipe; 502. Main combustion stage main pipe; 503. Main combustion stage connecting pipe; 504. First connecting branch pipe; 505. Second connecting branch pipe; 506. Third connecting branch pipe;

[0041] 60. Gas supply pipeline. Detailed Implementation

[0042] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0045] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] The following is combined Figures 1-13 This invention describes a hydrogen micro-mixing staged combustion flame tube according to an embodiment of the present invention.

[0048] An embodiment of the first aspect of the present invention provides a hydrogen micro-mixing staged combustion flame tube, such as... Figures 1 to 4 As shown, the hydrogen micro-mixing staged combustion flame tube includes a micro-mixing shell 20 and a head mixing plate 2. The head mixing plate 2 is connected to the micro-mixing shell 20, and the head mixing plate 2 and the micro-mixing shell 20 are configured with a mixing chamber 103. The head mixing plate 2 has multiple concentrically arranged groups of combustion holes, each group of combustion holes including multiple combustion holes 6. Multiple gas supply units are arranged inside the head mixing plate 2, and each gas supply unit is connected to the combustion holes 6 of at least one group of combustion holes. Each gas supply unit is connected to a gas supply pipeline 60, and the gas supply pipeline 60 is equipped with a control valve.

[0049] It is understood that the micro-mixing shell 20 is a hollow structure, and the head mixing plate 2 is set at the front end of the micro-mixing shell 20. Thus, the head mixing plate 2 and the micro-mixing shell 20 construct a mixing cavity 103. The head mixing plate 2 has multiple rings of combustion holes. The multiple rings of combustion holes are arranged concentrically from the center of the head mixing plate 2 outward. Each ring of combustion holes includes multiple combustion holes 6 arranged circumferentially.

[0050] The head mixing plate 2 is equipped with multiple air supply units to supply fuel to the combustion holes 6. The head mixing plate 2 has multiple rings of combustion holes. It can supply fuel to all combustion holes 6 of one ring of combustion holes through one air supply unit, or it can supply fuel to all combustion holes 6 of two or more rings of combustion holes through one air supply unit.

[0051] The head mixing plate 2 is provided with a gas supply pipeline 60 connected to the gas supply unit, and a control valve is provided on the gas supply pipeline 60. The opening and closing of the gas supply pipeline 60 can be controlled by the control valve, thereby controlling the opening and closing of the gas supply unit to the combustion hole 6, so as to realize the graded control of the fuel supply, thereby improving the complete combustion of fuel and improving the fuel utilization rate.

[0052] Air enters combustion port 6 and is thoroughly mixed and combusted with the fuel jetted from the air supply unit into combustion port 6. Then, it enters mixing chamber 103. The opening and closing of a corresponding number of air supply units can be controlled according to the characteristics of different fuels, effectively improving fuel utilization. It should be noted that, even with the same fuel, staged combustion can be achieved by controlling the number of air supply units open during combustion, resulting in even higher fuel utilization and reduced NOx emissions.

[0053] In this embodiment, the fuel can be hydrogen. Air and hydrogen are mixed at the combustion hole, which serves as a hydrogen micro-mixing unit. Of course, the fuel can also be other gases or liquids with combustion characteristics.

[0054] The hydrogen micro-mixing staged combustion flame tube provided in this embodiment of the invention has a multi-ring combustion hole group arranged concentrically through the head mixing plate 2, and fuel is supplied to the multi-ring combustion hole group through multiple air supply units. Air enters the combustion hole 6 and mixes effectively with the fuel jetted to the combustion hole 6 by the air supply unit, which can realize fuel diffusion combustion. According to the characteristics of different fuels, the opening and closing of the corresponding number of air supply units can be controlled to effectively improve the fuel utilization rate and reduce the emission of NOx and other exhaust gases.

[0055] Furthermore, the hydrogen micro-mixing staged combustion flame tube provided in this embodiment of the invention effectively reduces the volume of the flame tube by arranging the gas supply unit inside the head mixing plate 2, thereby achieving miniaturization. It should be noted that if the gas supply unit is arranged outside the head mixing plate 2, the corresponding gas supply pipeline will increase, thus increasing design costs; simultaneously, arranging the gas supply unit inside the head mixing plate 2 avoids the ablation problem that would occur if the gas supply unit were externally subjected to high-temperature heat loads.

[0056] In one embodiment of the present invention, the head mixing plate 2 has three rings of combustion holes and two gas supply units are arranged inside the head mixing plate 2. One gas supply unit is connected to all the outermost rings of combustion holes 303, and the other gas supply unit is connected to the remaining two rings of combustion holes.

[0057] like Figure 4 As shown, the three rings of combustion holes are arranged sequentially from the outside in: the outermost ring of combustion holes 303, the middle ring of combustion holes 302, and the inner ring of combustion holes 301. Figure 9 As shown, the two gas supply units are the duty gas supply unit 40 and the main combustion stage gas supply unit 50. The duty gas supply unit 40 is connected to all the combustion holes 6 of the outermost combustion hole group 303, and the main combustion stage unit is connected to all the combustion holes 6 of the middle combustion hole group 302 and all the combustion holes 6 of the inner combustion hole group 301.

[0058] In one embodiment of the present invention, such as Figure 9 and Figure 10 As shown, the duty air supply unit 40 includes a duty air supply main pipe and multiple duty connecting pipes 403. The number of duty connecting pipes 403 corresponds to the number of combustion holes 6 in the outermost ring combustion hole group 303. Each combustion hole 6 in the outermost ring combustion hole group 303 is connected to the duty air supply main pipe through the corresponding duty connecting pipe 403.

[0059] The duty officer gas supply main pipe includes a duty officer branch pipe 401 and at least one duty officer main pipe 402 connected to the duty officer branch pipe 401. One side of the duty officer branch pipe 401 is connected to multiple duty officer connecting pipes 403, and the other side of the duty officer branch pipe 401 is connected to multiple duty officer main pipes 402. Each duty officer main pipe 402 is connected to a gas supply line 60, through which fuel is supplied to the duty officer main pipe 402. The fuel from the multiple duty officer main pipes 402 first flows into the duty officer branch pipe 401, filling the duty officer branch pipe 401, and then is evenly distributed to the multiple duty officer connecting pipes 403 through the duty officer branch pipe 401, thereby achieving a uniform fuel supply to the combustion holes 6 of the outermost ring combustion hole group 303.

[0060] In one embodiment of the present invention, such as Figure 9 and Figure 10 As shown, the main combustion stage gas supply unit 50 includes a main combustion stage main pipe and multiple main combustion stage connecting pipes 503. The number of main combustion stage connecting pipes 503 corresponds to the number of combustion holes 6 in the intermediate ring combustion hole group 302. The combustion holes 6 of the intermediate ring combustion hole group 302 are connected to the main combustion stage main pipe through the corresponding main combustion stage connecting pipes 503. At the same time, the combustion holes 6 of the inner ring combustion hole group 301 are also connected to the main combustion stage main pipe through the corresponding main combustion stage connecting pipes 503.

[0061] The main combustion stage manifold includes a main combustion stage branch pipe 501 and at least one main combustion stage main pipe 502 connected to the main combustion stage branch pipe 501. One side of the main combustion stage branch pipe 501 is connected to multiple main combustion stage connecting pipes 503 respectively, and the other side of the main combustion stage branch pipe 501 is connected to multiple main combustion stage main pipes 502. Each main combustion stage main pipe 502 is connected to a gas supply line 60, which supplies fuel to the main combustion stage main pipe 502. The fuel from the multiple main combustion stage main pipes 502 first flows into the main combustion stage branch pipe 501 and fills the main combustion stage branch pipe 501. Then, it is evenly distributed to the multiple main combustion stage connecting pipes 503 through the main combustion stage branch pipe 501, thereby achieving a uniform fuel supply to the combustion holes 6 of the inner ring combustion hole group 301 and a uniform fuel supply to the combustion holes 6 of the middle ring combustion hole group 302.

[0062] In one embodiment of the present invention, such as Figure 9As shown, both the main combustion level supervisor 502 and the duty supervisor 402 are arc-shaped and located on the same circle. When there are multiple main combustion level supervisors 502 and multiple duty supervisors 402, the multiple main combustion level supervisors 502 are evenly spaced along the circumference, and the multiple duty supervisors 402 are also evenly arranged along the circumference, and the main combustion level supervisors 502 and duty supervisors 402 are staggered along the circumference.

[0063] In an optional embodiment of this example, the number of main combustion level supervisors 502 and the number of duty supervisors 402 are equal, with two main combustion level supervisors 502 and two duty supervisors 402. The two main combustion level supervisors 502 and the two duty supervisors 402 are arranged symmetrically, with each duty supervisor 402 positioned between two adjacent main combustion level supervisors 502. Thus, one main combustion level supervisor 502, one duty supervisor 402, the other main combustion level supervisor 502, and the other duty supervisor 402 are arranged sequentially along the same circumference, as shown in the reference. Figure 9 As shown.

[0064] Furthermore, the main combustion stage branch pipe 501 and the duty branch pipe 401 are in a ring shape. The duty branch pipe 401 and the main combustion stage branch pipe 501 are concentrically arranged from the outside to the inside on the inner side of the main combustion stage main pipe 502 and located on the outer side of the multi-ring combustion hole group.

[0065] It is understandable that the main combustion stage branch pipe 501 is located inside the duty branch pipe 401, and the outermost ring combustion hole group 303 is located inside the main combustion stage branch pipe 501. Therefore, the duty branch pipe 401 and the outermost ring combustion hole group 303 are located on both sides of the main combustion stage branch pipe 501. The duty connecting pipe 403 connecting the outermost ring combustion hole group 303 and the duty branch pipe 401 needs to pass through the outer wall of the main combustion stage branch pipe 501. In order to avoid the duty connecting pipe 403 being directly set on the outer wall surface of the main combustion stage branch pipe 501, resulting in a large thickness of the head mixing plate 2, the outer wall of the main combustion stage branch pipe 501 in this embodiment is provided with a recess to accommodate the duty connecting pipe 403, so as to reduce the thickness of the head mixing plate 2. In addition, the outer wall of the main combustion stage branch pipe 501 can also limit the position of the duty connecting pipe 403.

[0066] In one embodiment of the present invention, a vortex generator 9 is provided on the inner wall of the combustion hole 6 near the center of the head mixing plate 2, and a spray hole is provided on the inner wall of the combustion hole 6, which is connected to the corresponding air supply unit.

[0067] Understandably, the head mixing plate 2 is provided with combustion holes 6, and each combustion hole 6 forms a flow channel. Within the combustion holes 6, air flows from upstream to downstream in the flow direction, and the head mixing plate 2 is provided with a gas supply unit (hydrogen jet channel). The inner wall of each combustion hole 6 is provided with a nozzle that communicates with the gas supply unit. Hydrogen is injected into the combustion holes 6 through the gas supply unit and the nozzle to fully mix and burn with the air flowing into the combustion holes 6.

[0068] It should be noted that the vortex generator 9 is located on the inner wall of the combustion hole 6 near the center of the head mixing plate 2, which effectively enhances the air turbulence effect of the vortex generator 9, resulting in greater loss of air kinetic energy and making it easier for the hydrogen jet to penetrate into the mainstream air, thus achieving effective mixing of the hydrogen ejected from the nozzle with the air.

[0069] Furthermore, such as Figure 5 , Figure 7 and Figure 8 As shown, a guide plate 1 is provided on the side of the head mixing plate 2 away from the combustion chamber shell 10, and multiple air inlets 5 are arranged on the guide plate 1 corresponding to the position of the mixing chamber 103.

[0070] It is understandable that the guide plate 1 is set on the front end face of the head mixing plate 2, and the guide plate 1 has multiple air inlets 5 arranged at the position corresponding to the mixing chamber 103. Air enters the combustion hole 6 of the head mixing plate 2 through the air inlets 5.

[0071] According to an embodiment of the present invention, a plurality of air inlets 5 are arranged on the guide plate 1, and a plurality of combustion holes 6 are arranged on the head mixing plate 2, so as to realize a large number of micro-scale flames, enhance the local mixing intensity of air and hydrogen, and improve the mixing uniformity.

[0072] For example, the diameter of the air intake hole 5 should be as small as possible, and the depth of the air intake hole 5 should be more than 1.5 times the diameter of the air intake hole 5. It should be noted that the depth of the air intake hole 5 is equal to the thickness of the guide plate 1.

[0073] The hydrogen micro-mixing staged combustion flame tube provided in this embodiment of the invention has multiple air inlets 5 designed on the front guide plate 1, which can effectively prevent hydrogen backfire caused by low axial velocity of air intake in the mixing chamber 103. At the same time, it is beneficial to the uniformity of air intake in the head mixing plate 2. The vortex generator 9 set on the inner wall of the combustion hole 6 on the head mixing plate 2 can effectively mix the hydrogen ejected through the nozzle with the air entering through the air inlet 5, so as to realize hydrogen diffusion combustion and avoid premixed combustion backfire and thermoacoustic instability problems.

[0074] It should be noted that existing premixed combustion hydrogen fuel combustion chambers are long and heavy, which is not conducive to improving the thrust-to-weight ratio of aero engines. They are generally suitable for ground-based gas turbines. However, in actual ground-based gas turbine experiments, the cost is high and the verification cycle is long, which is not conducive to the rapid development of products. In contrast, the turbulence structure design of the guide vane 1 and the head mixing plate 2 in this embodiment of the invention results in a smaller hydrogen micro-mixing combustion chamber with a smaller length and weight. When tested in a micro turbojet engine, the development cost is low and the verification cycle is short, thus facilitating the rapid development of products.

[0075] In one embodiment of the present invention, such as Figure 6 As shown, the micro-mixing shell 20 includes a coaxially arranged outer flame cylinder 3 and an inner flame cylinder 4, both of which are cylindrical. A head mixing plate 2 is disposed at the front end of the outer flame cylinder 3 and the front end of the inner flame cylinder 4, forming a mixing cavity 103 between the head mixing plate 2, the inner flame cylinder 4, and the outer flame cylinder 3. In an optional embodiment of the invention, the outer flame cylinder 3, the inner flame cylinder 4, and the head mixing plate 2 are integrally formed by 3D printing and welded to the guide plate 1 to form a complete hydrogen micro-mixing staged combustion flame tube for hydrogen micro-mixing combustion.

[0076] Furthermore, to prevent the hydrogen micro-mixing staged combustion flame tube from being subjected to high-temperature heat loads for a long time and causing ablation, cooling holes are provided on the outer flame tube 3, the inner flame tube 4, and the head mixing plate 2 to avoid high-temperature ablation and thus extend the service life.

[0077] In one embodiment of the present invention, a plurality of combustion holes 6 are distributed on the head mixing plate 2, and the plurality of combustion holes 6 form a honeycomb-like structure. The honeycomb structure is both robust and material-saving, reducing material costs, improving space utilization, making the combustion chamber safer and more reliable, and is also lightweight, which can effectively reduce the weight of the engine.

[0078] A vortex generator 9 is arranged on the inner wall of the combustion hole 6 to enhance the mixing of hydrogen and air. A nozzle is provided on the inner wall of the combustion hole 6, and the ejection direction of the nozzle is perpendicular to one wall surface of the combustion hole 6 to ensure that the hydrogen ejected from the nozzle is fully mixed with air and combusted.

[0079] In one embodiment of the present invention, the combustion hole 6 has a cross-section of a regular polygon, and the inner wall of the combustion hole 6 is provided with two spray holes, the central axis of which is perpendicular to one side of the regular polygon.

[0080] Understandably, the cross-sections of the combustion holes 6 are all regular polygons, and multiple combustion holes 6 have identical cross-sections to facilitate machining and shorten the machining cycle. Of course, the cross-sectional shape of the combustion holes 6 is not limited to regular polygons; it can also be circular, square, rectangular, triangular, arched, or elliptical. The central axis of the nozzle is perpendicular to one side of the regular polygon, meaning the central axis of the nozzle is perpendicular to one of the multiple inner walls of the regular polygonal combustion hole 6.

[0081] For example, the size of the combustion hole 6 is less than 10mm. It should be noted that, regardless of the shape of the combustion hole 6, it is sufficient that the outer expansion dimension of the combustion hole 6 is less than 10mm.

[0082] In this embodiment of the invention, the cross-section of the combustion hole 6 is a regular hexagon, so that the head mixing plate 2 forms a hexagonal prism channel with a size of less than 10 mm at the combustion hole 6. Each combustion hole 6 has a built-in micro vortex generator 9, which is used to enhance the mixing of hydrogen and air.

[0083] It should be noted that the combustion holes 6 of the head mixing plate 2 serve as micro-mixing channels. Therefore, this embodiment uses an array of micro-mixing channels instead of traditional swirling mixing channels. The micro-mixing channels are generally less than 10 mm in size. The combustion holes 6, as tiny flame clusters formed by the micro-mixing structure, achieve thorough mixing of hydrogen and air and shorten the combustion gas residence time, thus further reducing the formation of nitrogen oxides. It should be noted that the combustion holes 6, as micro-mixing channels, can employ mixing methods such as jet-crossflow mixing, swirling micro-mixing, co-current mixing within the channel, radial and axial inflow within small "cup" swirling mixing, porous media mixing, and spiral loop mixing.

[0084] In one embodiment of the present invention, the vortex generator 9 has two sides, and the inner wall of the combustion hole 6 has two nozzles, which face the two sides respectively.

[0085] For example, the inner wall of the combustion orifice 6 is provided with two nozzles, which are symmetrically arranged about one of the diameters of a regular polygon and located on two different sides of the polygon. Alternatively, the two nozzles are located on two different inner walls of the regular hexagonal combustion orifice 6, with an inner wall spaced apart from each other. By symmetrically arranging the two nozzles, the ejected hydrogen gas can interact, resulting in a more uniform mixture of hydrogen and air. Preferably, by arranging the two nozzles on both sides of the vortex generator 9, the mixing of air and hydrogen can be further enhanced.

[0086] It should be noted that the inner wall of the combustion hole 6 is provided with two nozzles. The central axis of the nozzle is perpendicular to one side of the regular polygon, so that the hydrogen gas ejected from the nozzle is sprayed perpendicular to the wall of the regular polygon, in order to further enhance the full mixing and combustion of air and hydrogen.

[0087] In one embodiment of the present invention, the vortex generator 9 is located at the end of the combustion hole 6 away from the guide plate 1, and the vortex generator 9 has a first dimension along the thickness direction of the head mixing plate 2, the first dimension being 3 / 4 to 5 / 6 of the thickness of the head mixing plate 2.

[0088] For example, the vortex generator 9 is triangular in shape, and the height of the vortex generator 9 gradually increases from the end closer to the guide plate 1 to the end farther away from the guide plate 1.

[0089] It should be noted that during the design process, the triangular side of the vortex generator 9 is generally placed close to the end face of the head mixing plate 2. The larger the axial length of the vortex generator 9, the stronger its effect on air turbulence, the greater the loss of air kinetic energy, and the easier it is for the hydrogen jet to penetrate into the mainstream air. Therefore, in this embodiment, the air inlet end of the vortex generator 9 is arranged closer to the center. For example, the axial length of the vortex generator 9 is generally taken in the range of 4mm to 5.5mm.

[0090] It is understandable that the axial length of the vortex generator 9 is the first dimension, and the thickness of the head mixing plate 2, which is also the axial length, is the second dimension. In this embodiment, the first dimension is 3 / 4 to 5 / 6 of the second dimension. It should be noted that when the vortex generator 9 is placed on the head mixing plate 2, the axial dimension of the vortex generator 9 is usually determined first, and then the axial dimension of the head mixing plate 2 is determined based on the axial dimension of the vortex generator 9. A larger thickness on the head mixing plate 2 increases the pressure loss of the flow, increasing the pressure loss throughout the combustion chamber, thereby increasing engine fuel consumption and reducing economic performance. Simultaneously, increased pressure loss, i.e., increased pressure difference between the inlet and outlet of the head mixing plate 2, leads to increased air jet velocity, which increases the difficulty of hydrogen jet penetration. Therefore, in this embodiment, the axial dimension of the vortex generator 9 can be designed to be 3 / 4 to 5 / 6 of the thickness of the head mixing plate 2 to limit the thickness of the head mixing plate 2, thereby enhancing the turbulence effect on the air, improving the uniformity of hydrogen distribution, and reducing NOx generation.

[0091] In one embodiment of the present invention, when two spray holes are provided on the inner wall of each combustion hole 6, each spray hole of the combustion hole 6 of the outermost ring combustion hole group 303 is connected to the duty branch pipe 401 through the duty connection pipe 403.

[0092] It is understandable that the combustion holes 6 of the outermost ring combustion hole group 303 have two spray holes. Each combustion hole 6 of the outermost ring combustion hole group 303 is connected to the duty branch pipe 401 through two duty connection pipes 403. Each spray hole is connected to the duty branch pipe 401 through one duty connection pipe 403. Therefore, the number of duty connection pipes 403 is twice the number of combustion holes 6 of the outermost ring combustion hole group 303.

[0093] Furthermore, one end of each main combustion stage connecting pipe 503 is connected to the main combustion stage branch pipe 501, and two first connecting branch pipes 504 are connected to the middle of the main combustion stage connecting pipe 503. The two first connecting branch pipes 504 are respectively connected to the nozzles of two adjacent combustion holes 6 of the intermediate ring combustion hole group 302.

[0094] The other end of the main combustion stage connecting pipe 503 has two second connecting branches 505 or one third connecting branch 506. The two second connecting branches 505 are respectively connected to the two nozzles of the combustion hole 6 corresponding to the inner ring combustion hole group 301. The third connecting branches 506 of two adjacent main combustion stage connecting pipes 503 are respectively connected to the two nozzles of the combustion hole 6 corresponding to the inner ring combustion hole group 301.

[0095] It is understandable that when the number of combustion holes 6 in the inner ring combustion hole group 301 is equal to the number of combustion holes 6 in the middle combustion hole group 6, then the other end of each main combustion stage connecting pipe 503 is connected to two second connecting branch pipes 505. The two nozzles of each combustion hole 6 in the inner ring combustion hole group 301 are respectively connected to the two second connecting branch pipes 505 of a main combustion stage connecting pipe 503. Thus, the two nozzles of each combustion hole 6 in the inner ring combustion hole group 301 are connected to the main combustion stage branch pipe 501 through a main combustion stage connecting pipe 503.

[0096] Since the inner ring combustion hole group 301 is located at the smallest radius of the circle, the number of holes arranged is limited. When the number of combustion holes 6 in the inner ring combustion hole group 301 is less than the number of combustion holes 6 in the middle combustion hole group 6, the other end of the main combustion stage connecting pipe 503 has a third connecting branch pipe 506. Then, one of the nozzles of each combustion hole 6 in the inner ring combustion hole group 301 is connected to a second connecting branch pipe 505 of a main combustion stage connecting pipe 503. Thus, the two nozzles of each combustion hole 6 in the inner ring combustion hole group 301 are connected to the main combustion stage branch pipe 501 through two main combustion stage connecting pipes 503.

[0097] It should be noted that the main combustion stage connecting pipe 503 can have two structural forms. Some main combustion stage connecting pipes 503 have two second connecting branch pipes 505, and the remaining main combustion stage connecting pipes 503 have one third connecting branch pipe 506. The number of main combustion stage connecting pipes 503 with the third connecting branch pipe 506 should be even, and every two main combustion stage connecting pipes 503 with the third connecting branch pipe 506 are arranged adjacent to each other.

[0098] In an optional embodiment of the present invention, the head mixing plate 2 is provided with three rings of combustion holes, namely, an inner ring combustion hole group 301, a middle ring combustion hole group 302 and an outermost ring combustion hole group 303 arranged from the inside to the outside. The number of combustion holes 6 in the middle ring combustion hole group 302 and the outermost ring combustion hole group 303 is equal, and the number of combustion holes 6 in the inner ring combustion hole group 301 is less than the number of combustion holes 6 in the middle ring combustion hole group 302.

[0099] Understandably, the inner ring combustion hole group 301 and the middle ring combustion hole group 302 are the main combustion stages. When the engine is at high power, hydrogen is supplied and burned. While ensuring the combustion room temperature rises, they also reduce the combustion temperature and pollutant emissions. The outermost ring combustion hole group 303 is on duty and plays a role in stabilizing the flame when the engine is at low power.

[0100] Based on the airflow distribution of the duty ward and the pre-combustion stage, the number of duty ward holes and main combustion stage holes were determined. There are 18 duty ward holes and 30 main combustion stage holes. The outermost ring combustion hole group 303 includes 18 combustion holes 6. In order to arrange 30 main combustion stage holes in a limited space, it is divided into two rings, namely the inner ring combustion hole group 301 and the middle ring combustion hole group 302 in this embodiment. Since the inner ring combustion hole group 301 is located at the smallest radius of the ring, the number of holes arranged is limited. Therefore, the number of combustion holes 6 in the inner ring combustion hole group 301 is less than the number of combustion holes 6 in the middle ring combustion hole group 302. At the same time, considering the periodic boundary conditions of numerical simulation, it is generally taken as 1 / 6 of the whole ring for calculation. Therefore, the number of combustion holes 6 in the inner ring combustion hole group 301 and the number of combustion holes 6 in the middle ring combustion hole group 302 are set to 12 and 18, respectively. It should be noted that the following factors were considered for the radial position: Since the outermost ring of combustion hole group 303 is closest to the combustion chamber air intake and is the easiest to intake air, while the inner ring of combustion hole group 301 is the farthest and is not easy to intake air, in order to ensure the uniformity of air intake of each ring of combustion hole 6, the combustion hole 6 of the outermost ring of combustion hole group 303 is radially downward, while the combustion hole 6 of the inner ring of combustion hole group 301 and the combustion hole 6 of the middle ring of combustion hole group 302 are radially upward.

[0101] The duty-shift gas supply unit 40 includes a duty-shift branch pipe 401, multiple duty-shift connecting pipes 403, and two duty-shift main pipes 402. The duty-shift branch pipe 401 is annular, and the two duty-shift main pipes 402 are evenly arranged on the outer periphery of the duty-shift branch pipe 401. The duty-shift main pipes 402 and the duty-shift branch pipe 401 are connected by multiple radial pipes arranged circumferentially. The outermost ring combustion hole group 303 includes 18 combustion holes 6 evenly distributed circumferentially. Each hydrogen injection hole of each combustion hole 6 is connected to the duty-shift branch pipe 401 through a duty-shift connecting pipe 403. Each combustion hole 6 has two hydrogen injection holes, so the 18 combustion holes 6 are connected to the duty-shift branch pipe 401 through 36 duty-shift connecting pipes 403.

[0102] The main combustion stage gas supply unit 50 includes a main combustion stage branch pipe 501, multiple main combustion stage connecting pipes 503, and two main combustion stage main pipes 502. The main combustion stage branch pipe 501 is annular and is coaxially arranged inside the duty branch pipe 401. The two main combustion stage main pipes 502 are evenly arranged on the outer periphery of the duty branch pipe 401, and the two main combustion stage main pipes 502 and the two duty main pipes 402 are on the same circumference. The main combustion stage main pipes 502 and the main combustion stage branch pipe 501 are connected by multiple radial pipes arranged circumferentially.

[0103] The inner ring combustion hole group 301 includes 12 combustion holes 6, the middle ring combustion hole group 302 includes 18 combustion holes 6, and the main combustion stage connecting pipe 503 has 18 pipes. The 18 pipes are evenly distributed along the circumference. The two first connecting branch pipes 504 in the middle of each main combustion stage connecting pipe 503 are respectively connected to the hydrogen injection holes of two adjacent combustion holes 6 in the middle ring combustion hole group 302.

[0104] Six of the main combustion stage connecting pipes 503 have two second connecting branch pipes 505, and twelve main combustion stage connecting pipes 503 have one third connecting branch pipe 506. The main combustion stage connecting pipes 503 with the second connecting branch pipes 505 are designated as first main combustion stage connecting pipes 503, and the main combustion stage connecting pipes 503 with the third connecting branch pipes 506 are designated as second main combustion stage connecting pipes 503. The six first main combustion stage connecting pipes 503 are evenly distributed circumferentially, and two second main combustion stage connecting pipes 503 are arranged between two adjacent first main combustion stage connecting pipes 503. Thus, all the main combustion stage connecting pipes 503 are evenly distributed circumferentially. The two second connecting branch pipes 505 of the first main combustion stage are respectively connected to the two hydrogen injection holes of the corresponding combustion hole 6, and the third connecting branch pipes 506 of two adjacent second main combustion stage connecting pipes 503 are respectively connected to the two hydrogen injection holes of the corresponding combustion hole 6.

[0105] The hydrogen micro-mixing staged combustion flame tube provided in this embodiment of the invention achieves staged combustion of fuel through the control of multiple gas supply units, and has the following advantages:

[0106] Higher combustion efficiency: Staged combustion allows fuel to burn in different temperature zones, resulting in higher fuel utilization and reduced exhaust emissions.

[0107] Reduce pollutant emissions: Staged combustion can reduce the production of harmful substances such as nitrogen oxides and sulfur oxides by controlling the temperature, thus reducing air pollutant emissions.

[0108] Reduced energy consumption: Staged combustion can effectively improve fuel utilization, thus obtaining more heat energy with the same amount of fuel, thereby reducing energy consumption.

[0109] Wide adaptability: Staged combustion can also be adjusted according to different fuel characteristics, thus adapting to different fuels and bringing great convenience to industrial production.

[0110] A second aspect of the present invention provides a hydrogen micro-mixing staged combustion chamber, such as... Figure 11 and Figure 12 As shown, the hydrogen micro-mixing combustion chamber includes a combustion chamber shell 10 and a hydrogen micro-mixing staged combustion flame tube provided in any of the above embodiments, wherein the hydrogen micro-mixing staged combustion flame tube is disposed in the combustion chamber shell 10.

[0111] It is understood that the rear end of the combustion chamber housing 10 has a combustion chamber outlet 101, and the rear end of the micro-mixing housing 20 forms an annular mixing outlet.

[0112] In one embodiment of the present invention, there is a first distance between the outer flame cylinder 3 and the combustion chamber shell 10, and an outer annular cavity 104 is constructed between the outer flame cylinder 3 and the combustion chamber shell 10. An inlet (combustion chamber inlet 102) is arranged at a corresponding position between the combustion chamber shell 10 and the outer annular cavity 104. An outer mixing hole 7 is arranged on the outer flame cylinder 3 to connect the outer annular cavity 104 and the mixing cavity 103.

[0113] It is understood that the micro-mixing head is located inside the combustion chamber shell 10, and there is a distance between the outer flame cylinder 3 and the combustion chamber shell 10, thereby forming an outer annular cavity 104 between the outer flame cylinder 3 and the combustion chamber shell 10. An external mixing hole 7 is arranged on the outer flame cylinder 3. Air flows through the inlet of the combustion chamber shell 10 through the outer annular cavity 104 between the outer flame cylinder 3 and the combustion chamber shell 10, and enters the mixing cavity 103 between the inner flame cylinder 4 and the outer flame cylinder 3 through the external mixing hole 7 on the outer flame cylinder 3.

[0114] It should be noted that, as Figure 13 As shown, air enters the interior of the combustion chamber shell 10 through the inlet and is divided into two parts. One part enters the combustion hole 6 of the head mixing plate 2 through multiple air inlet holes 5 on the guide plate 1, and is fully mixed with the hydrogen gas sprayed out through the nozzle on the inner wall of the combustion hole 6, and then enters the mixing chamber 103. The other part flows through the outer annular cavity 104 between the outer flame cylinder 3 and the combustion chamber shell 10, and enters the mixing chamber 103 through the outer mixing hole 7 on the outer flame cylinder 3, so as to dilute and mix the high-temperature fuel gas and ensure that the temperature distribution at the combustion chamber outlet 101 is uniform.

[0115] Furthermore, such as Figure 13 As shown, there is a second distance between the guide plate 1 and the combustion chamber shell 10, and an air intake chamber is constructed between the guide plate 1 and the combustion chamber shell 10. The guide plate 1 and the head mixing plate 2 form an air intake channel that connects the air intake chamber and the inner cavity of the flame inner cylinder 4. The flame inner cylinder 4 is provided with an inner mixing hole 8 that connects the inner cavity of the flame inner cylinder 4 and the mixing chamber 103.

[0116] For example, the guide plate 1 is an annular circular plate, connected to the front end of the outer flame cylinder 3. The through hole in the middle of the guide plate 1 serves as an air intake channel, and hundreds of air intake holes 5 are distributed on the guide plate 1. Furthermore, the guide plate 1 is covered with air intake holes 5 at positions corresponding to the mixing chamber 103. For example, the air intake holes 5 are arranged in multiple rings with the center of the guide plate 1 as the center.

[0117] It is understandable that an intake chamber is formed between the guide vane 1 and the combustion chamber shell 10. The air from the centrifugal compressor enters the interior of the combustion chamber shell 10 through the inlet and is divided into three parts to enter the micro-mixing head. The first part directly enters the outer annular cavity 104 axially and enters the mixing chamber 103 through the outer mixing hole 7 on the outer flame tube 3 to dilute and mix the high-temperature gas. The second part turns radially and then axially and enters the mixing chamber 103 through the intake hole 5 on the guide vane 1 and the combustion hole 6 on the head mixing plate 2 to mix and burn with the hydrogen jet injected through the hydrogen jet channel and nozzle. The third part enters the inner annular cavity 105 through the intake channel of the guide vane 1 and the head mixing plate 2 and enters the mixing chamber 103 through the inner mixing hole 8 of the inner flame tube to dilute and mix the high-temperature gas, ensuring uniform temperature distribution at the combustion chamber outlet 101, preventing downstream turbine blade erosion, and extending engine life.

[0118] It should be noted that the combustion chamber shell 10 and the mixing chamber 103 have openings at their respective rear ends, which serve as the combustion chamber outlet 101.

[0119] It should be noted that the deflector 1 can effectively prevent low axial velocity of the combustion chamber intake and hydrogen backfire, and at the same time, it can help improve the uniformity of the intake of the combustion holes 6 of the head mixing plate 2, and prevent the problem of low local air flow and high flame temperature.

[0120] The hydrogen micro-mixing combustion chamber provided in this embodiment of the invention allows air to enter the combustion chamber through three parts. One part of the air entering through the air inlet 5 is mixed and combusted with the hydrogen jet injected through the hydrogen jet channel and nozzle to produce high-temperature combustion gas. The other two parts enter the mixing chamber 103 through the outer mixing hole 7 and the inner mixing hole 8, respectively, to dilute and mix the high-temperature combustion gas, ensuring a uniform temperature distribution at the combustion chamber outlet 101, preventing downstream turbine blade erosion, and extending engine life.

[0121] The hydrogen micro-mixing combustion chamber provided in this invention enhances the mixing of air and hydrogen through the turbulence effect of the guide vane 1 and the head mixing plate 2, enabling hydrogen diffusion combustion and thus achieving efficient combustion within a confined space. Furthermore, the guide vane 1 structure effectively prevents backfire due to the axial velocity of the intake air, and the combustion holes 6 of the head mixing plate 2 enable lean, non-premixed combustion, reducing flame temperature and avoiding the generation of large amounts of nitrogen oxides, effectively reducing nitrogen oxide emissions and demonstrating significant low-pollution combustion potential. Simultaneously, it can be verified in a micro turbojet engine, overcoming the problems of high development costs and long verification cycles associated with real-world ground gas turbines.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen micro-mixing staged combustion flame tube, characterized in that, include: Micro-mixing shell; A head mixing plate is connected to the micro-mixing shell, and the head mixing plate and the micro-mixing shell are configured with a mixing cavity; The head mixing plate has multiple concentric rings of combustion holes, each ring of combustion holes including multiple combustion holes; The head mixing plate is internally arranged with multiple air supply units, each of which is connected to the combustion holes of at least one ring of combustion holes; each air supply unit is connected to an air supply pipeline, and the air supply pipeline is equipped with a control valve. The head mixing plate has three rings of combustion holes. Two air supply units are arranged inside the head mixing plate: a duty air supply unit and a main combustion stage air supply unit. The duty air supply unit is connected to the outermost ring of combustion holes, and the main combustion stage air supply unit is connected to the other two rings of combustion holes. The duty air supply unit includes a duty air supply main pipe and multiple duty connecting pipes. The duty air supply main pipe includes a duty main pipe and at least one duty branch pipe connected to the duty main pipe. Each duty main pipe is connected to the air supply line. Each of the outermost rings of combustion holes... The burn-in hole is connected to the duty-shift branch pipe through the corresponding duty-shift connecting pipe; the main combustion stage gas supply unit includes a main combustion stage main pipe and multiple main combustion stage connecting pipes. The main combustion stage main pipe includes a main combustion stage main pipe and at least one main combustion stage branch pipe connected to the main combustion stage main pipe. Each main combustion stage main pipe is connected to a gas supply pipeline; one end of each main combustion stage connecting pipe is connected to the main combustion stage branch pipe, and the other end of the main combustion stage connecting pipe is connected to the combustion hole corresponding to the inner ring combustion hole group and the combustion hole corresponding to the middle ring combustion hole group; the main combustion stage main pipe and the duty-shift main pipe are both arc-shaped and located on the same circle; The main combustion stage branch pipe and the duty branch pipe are in a circular shape. The duty branch pipe and the main combustion stage branch pipe are concentrically arranged from the outside to the inside on the inner side of the main combustion stage main pipe and located on the outside of the multi-ring combustion hole group. The outer wall of the main combustion stage branch pipe has a recessed portion to accommodate the duty connecting pipe.

2. The hydrogen micro-mixing staged combustion flame tube according to claim 1, characterized in that, A vortex generator is provided on the inner wall of the combustion hole near the center of the head mixing plate. The inner wall of the combustion hole is provided with a spray hole that communicates with the corresponding air supply unit. A guide plate is provided on the side of the head mixing plate away from the combustion chamber shell. The guide plate has multiple air inlets arranged at the position corresponding to the mixing chamber.

3. The hydrogen micro-mixing staged combustion flame tube according to claim 2, characterized in that, The vortex generator has two sides, and two nozzles are formed on the inner wall of the combustion hole, with the two nozzles facing the two sides respectively.

4. The hydrogen micro-mixing staged combustion flame tube according to claim 3, characterized in that, Each nozzle of the combustion hole in the outermost ring of combustion holes is connected to the duty officer branch pipe through the duty officer connecting pipe.

5. The hydrogen micro-mixing staged combustion flame tube according to claim 4, characterized in that, Two first connecting branches are connected to the middle of each main combustion stage connecting pipe. The two first connecting branches are respectively connected to the nozzles of two adjacent combustion holes of the middle ring combustion hole group. The other end of the main combustion stage connecting pipe has two second connecting branches or one third connecting branch. The two second connecting branches are respectively connected to the two nozzles of the combustion hole corresponding to the inner ring combustion hole group. The third connecting branches of two adjacent main combustion stage connecting pipes are respectively connected to the two nozzles of the combustion hole corresponding to the inner ring combustion hole group.

6. A hydrogen micro-mixing staged combustion chamber, characterized in that, It includes a combustion chamber shell and a hydrogen micro-mixing staged combustion flame tube as described in any one of claims 1 to 5, wherein the hydrogen micro-mixing staged combustion flame tube is disposed in the combustion chamber shell.

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