A hydrogen-oxygen micro-mixing combustion chamber

Abstract

The invention relates to the technical field of combustion chambers, and specifically discloses a hydrogen-oxygen micro-mixing combustion chamber, wherein the combustion chamber is arranged inside a casing, the combustion chamber comprises a combustion chamber head, an axially graded nozzle and a flame tube, the combustion chamber head is provided with six sector units and a central circular duty unit, each unit is formed by an array of multiple micro-mixing combustion nozzles, the axially graded nozzles are evenly distributed on the flame tube in a circumferential direction, and are arranged in a single row or multiple rows; the hydrogen-oxygen micro-mixing combustion chamber of the invention can prevent hydrogen and oxygen airflows from meeting in an undiluted state, achieve nearly homogeneous mixing when the mixed air is to be burned, enter the combustion chamber in the form of multiple tiny jets to form an array of small flames, the flame tube cooling gas slightly does not interfere with the penetration of the combustion field, hydrogen and oxygen are accompanied, and the grading is flexible and online adjustable, thereby achieving efficient and reliable combustion of hydrogen and oxygen.

Description

Technical Field

[0001] The invention relates to the technical field of combustion chambers, and in particular to a hydrogen-oxygen micro-mixing combustion chamber. Background Art

[0002] The high proportion of wind and solar renewable energy is the key to building a new power system with new energy as the main body. However, the uneven spatial distribution and the intermittent, random and volatile temporal distribution make it extremely difficult to match wind and solar power generation with users. Large-scale energy storage is the guarantee for the high proportion of wind and solar power generation. The hydrogen energy storage technology route of "wind and solar power generation-electrolysis hydrogen production-hydrogen power generation" is clear, the industrial chain is complete, and there are no fundamental constraints such as mineral resources, which has significant development advantages. After large-scale electrolysis of water to produce hydrogen, the amount of oxygen by-product is huge. The hydrogen pure oxygen combustion technology can realize on-site water circulation, which can solve the water resource constraints faced by large-scale hydrogen production, and gas turbines are the preferred way to achieve efficient utilization of gas fuels. Compared with natural gas, hydrogen combustion has a high flame propagation speed, a high flameout stretch rate, a high flame temperature, and a high risk of flashback. Pure oxygen is an extremely active oxidant, which can even ignite fire by friction with metal at a certain flow rate. To achieve safe and controllable combustion of hydrogen and oxygen, non-flammable gas must be used as a diluent and protective gas. By mixing, the concentration of hydrogen and oxygen is reduced to a safe range, the hot end components are cooled, and the combustible gas is blown out in some corners and cavities where gas enrichment may occur to ensure reliable combustion. The addition of diluents and the high activity of hydrogen and oxygen as fuel and oxidant allow the mixed combustion of the three gases. Unlike traditional combustion chambers that only consider the mixed combustion of fuel and oxidant gases, it is necessary to comprehensively consider the way the gas enters the combustion chamber, the combustion chamber staged adjustment method, the flame organization method, the cooling scheme, etc., so as to achieve safe and stable combustion in the hydrogen and oxygen micro-mixed combustion chamber.

[0003] For pure hydrogen fuel, if conventional premixed combustion is used, self-ignition, flashback and thermoacoustic oscillation are very likely to occur, resulting in damage to the combustion chamber. Micro-mixed combustion reduces the mixing scale, thereby shortening the mixing time and preventing self-ignition. High-speed direct injection is used to avoid the reflow zone at the nozzle outlet to suppress flashback. This is also a method suitable for pure hydrogen fuel combustion that is being studied at home and abroad. In addition, through the axial staging of air and fuel, on the one hand, the opening of the flame tube suppresses thermoacoustic oscillation, and on the other hand, increasing the axial staging of fuel promotes burnout, reduces NOx, and can widen the range of stable operating conditions. The currently published micro-mixed combustion chamber schemes are all aimed at combustion with air as the oxidant. They are directly used for hydrogen-oxygen combustion. The dilution gas can only enter the combustion chamber from the fuel or oxygen channel, making it difficult to achieve synchronous regulation of hydrogen and oxygen, and it is impossible to achieve hydrogen and oxygen combustion near the equivalence ratio of 1. If hydrogen-rich combustion or oxygen-rich combustion is used, the hydrogen or oxygen accumulated in the exhaust may cause the risk of deflagration. In addition, if the combustion chamber does not provide a separate flow channel and gas collecting cavity for the dilution gas, the dilution gas cannot be used alone as a protective gas, which further increases the difficulty and safety of the combustion organization of the combustion chamber. Summary of the invention

[0004] The purpose of the present invention is to provide a hydrogen-oxygen mild mixing combustion chamber to solve the problems raised by the above background technology in view of the defects of the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions: a hydrogen-oxygen micro-mixing combustion chamber, the combustion chamber is arranged inside the casing, the combustion chamber comprises a combustion chamber head, an axially graded nozzle and a flame tube, the combustion chamber head is provided with six sector units and a central circular duty unit, each unit is formed by an array of multiple micro-mixing combustion nozzles, the axially graded nozzles are uniformly distributed on the flame tube in the circumferential direction, and are arranged in a single row or multiple rows;

[0006] Each micro-mixed combustion nozzle is provided with a nozzle dilution gas inlet, a nozzle hydrogen inlet, and a nozzle oxygen inlet;

[0007] A hydrogen gas collecting chamber is provided inside the combustion chamber head, and the hydrogen gas collecting chamber is connected with seven combustion chamber hydrogen inlets at the end of the combustion chamber head; hydrogen gas collecting chambers corresponding to different units are separated by partitions; hydrogen in the hydrogen gas collecting chamber passes through the hydrogen air distribution plate and then enters the micro-mixed combustion nozzle through the nozzle hydrogen inlet;

[0008] Thirteen combustion chamber oxygen inlets are arranged on the outside of the combustion chamber head, and the combustion chamber oxygen inlets are connected to the oxygen collecting chamber in the combustion chamber head, and the oxygen collecting chambers corresponding to different units are separated by partitions; the oxygen in the oxygen collecting chamber passes through the oxygen air distribution plate A and the oxygen air distribution plate B, and enters the micro-mixed combustion nozzle through the nozzle oxygen inlet;

[0009] The inner diameter of the hydrogen inlet of each combustion chamber is 35 mm; the inner diameter of the oxygen inlet of each combustion chamber is 25 mm;

[0010] The casing is provided with a dilution gas inlet, and a flow channel for conveying dilution gas is formed between the casing and the combustion chamber partition and the flame tube. The flow channel is connected to the dilution gas inlet, and the dilution gas passes through the flow channel and then enters the micro-mixing combustion nozzle through the nozzle dilution gas inlet.

[0011] As a preferred technical solution of the present invention, a cooling end plate A and a cooling end plate B are arranged near the nozzle outlet of the micro-mixed combustion nozzle, and the cooling end plate A is densely covered with impact film cooling holes, and the cooling end plate B is provided with air film cooling holes and divergent cooling holes. The incoming dilution gas impacts the cooling end plate B and is cooled by the air film cooling holes and the divergent cooling holes on the cooling end plate B. The diameters of the impact film cooling holes and the air film cooling holes are between 0.2-3 mm.

[0012] As a preferred technical solution of the present invention, the nozzle dilution gas inlet is provided with eight, the nozzle hydrogen inlet is provided with four, and the nozzle oxygen inlet is provided with four. From upstream to downstream of the micro-mixed combustion nozzle, they are the nozzle hydrogen inlet, the nozzle dilution gas inlet, and the nozzle oxygen inlet, respectively. The gas nozzle air inlets of the same type are evenly distributed circumferentially on the micro-mixed combustion nozzle.

[0013] As a preferred technical solution of the present invention, the lip edge of the nozzle outlet protrudes on the cooling end plate A by 4 mm.

[0014] As a preferred technical solution of the present invention, an independent regulating valve is provided on the air inlet pipe of the axial grading nozzle for online flow control.

[0015] As a preferred technical solution of the present invention, the straight section of the flame tube is provided with oblique film cooling holes, and the inclined section of the flame tube is provided with spoiler ribs, and the oblique film cooling holes and spoiler ribs are used to cool the flame tube temperature;

[0016] The diameter of the beveled air film cooling hole is 0.2-4mm, the axis of the beveled air film cooling hole and the normal of the curved surface at which it is located form an angle of 1-89°, and when the cross-section of the flame tube is circular, the beveled air film cooling holes are evenly distributed along the cross-section circumference perpendicular to the axis of the flame tube.

[0017] As a preferred technical solution of the present invention, the main body of the micro-mixing combustion nozzle is a cylindrical long tube, the inner diameter of the micro-mixing combustion nozzle is between 2-12 mm, and the length is between 5-100 mm.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the combustion chamber of the present invention combines the micro-mixed combustion technology, the staged combustion technology and the hydrogen, oxygen and dilution gas flow organization scheme of the combustion chamber itself, so that the hydrogen and oxygen airflows do not meet in an undiluted state, the mixed gas achieves nearly homogeneous mixing when waiting to be burned, enters the combustion chamber in the form of multiple tiny jets to form an array of small flames, the flame tube cooling gas slightly does not interfere with the penetration of the combustion field, hydrogen and oxygen are accompanied, and the staged combustion is flexible and adjustable online, thereby achieving efficient and reliable combustion of hydrogen and oxygen.

[0019] The present invention properly combines micro-mixed combustion and fuel axial staged combustion in one combustion chamber to achieve safe, stable and low-emission combustion of pure hydrogen and pure oxygen in a water vapor environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the combustion chamber head of the present invention;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention.

[0023] In the figure: 1. Combustion chamber head; 2. Axially graded nozzle; 3. Flame tube; 4. Casing; 5. Combustion chamber partition; 6. Dilution gas inlet; 7. Combustion chamber hydrogen inlet; 8. Combustion chamber oxygen inlet; 11. Micro-mixed combustion nozzle; 111. Nozzle dilution gas inlet; 112. Nozzle hydrogen inlet; 113. Nozzle oxygen inlet; 114. Nozzle outlet; 12. Cooling end plate A; 121. Impact film cooling hole; 13. Cooling end plate B; 131. Film cooling hole; 132. Divergent cooling hole; 14. Hydrogen air distribution plate; 15. Oxygen air distribution plate A; 16. Oxygen air distribution plate B; 18. Hydrogen gas collecting chamber; 19. Oxygen gas collecting chamber; 31. Oblique film cooling hole; 32. Spoiler rib. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0025] Example: See Figure 1-3The present invention provides a technical solution: a hydrogen-oxygen micro-mixing combustion chamber, the combustion chamber is arranged inside a casing 4, the combustion chamber comprises a combustion chamber head 1, an axially graded nozzle 2 and a flame tube 3, the combustion chamber head 1 is provided with 6 sector units and 1 central circular duty unit, each unit is formed by an array of multiple micro-mixing combustion nozzles 11, the fuel of the combustion chamber is hydrogen, the oxidant is oxygen, and the diluent is a non-combustible gas including water vapor, and correspondingly, the combustion chamber is provided with a separate combustion chamber hydrogen inlet 7, a combustion chamber oxygen inlet 8 and a dilution gas inlet 6; the micro-mixing combustion nozzle 11 adopts a jet collision scheme to promote the mixing of hydrogen, oxygen and dilution gas jets, and the jets flow through a mixing section after the jet collision and are mixed into a multi-component premixed combustible gas; the mixing section after the jet collision generally leaves a long straight section not less than 4 times the inner diameter of the nozzle, so that different types of gases can be freely mixed and premixed before entering the flame tube;

[0026] like Figure 2 As shown: the main body of the micro-mixed combustion nozzle 11 is a cylindrical long tube, the inner diameter of the micro-mixed combustion nozzle 11 is between 2-12 mm, and the length is between 5-100 mm. Each micro-mixed combustion nozzle 11 is provided with eight nozzle dilution gas inlets 111, four nozzle hydrogen inlets 112, and four nozzle oxygen inlets 113. From upstream to downstream, they are the nozzle hydrogen inlet 112, the nozzle dilution gas inlet 111, and the nozzle oxygen inlet 113. The same type of gas nozzle inlets are evenly distributed on the micro-mixed combustion nozzle 11 in the circumferential direction;

[0027] A nozzle dilution gas inlet 111 is provided between the nozzle oxygen inlet 113 and the nozzle hydrogen inlet 112 to ensure that hydrogen and oxygen do not mix directly to achieve safe combustion.

[0028] Hydrogen, oxygen and dilution gas can be supplied in different ways. Before entering the combustion chamber, part of the dilution gas can be mixed with hydrogen or oxygen to dilute it, and then enter the combustion chamber from the hydrogen or oxygen inlet. Thereafter, the remaining dilution gas that is not mixed enters the combustion chamber from the nozzle dilution gas inlet 111. The dilution gas can also enter the combustion chamber directly from the nozzle dilution gas inlet 111 without being mixed with hydrogen / oxygen. The hydrogen and oxygen entering the combustion chamber first enter their respective gas collecting cavities and then are distributed by the gas collecting cavities to enter the nozzle. Hydrogen, oxygen or their dilution gases are adjusted during the operation of the combustion chamber, that is, when the flow rate of one of the gases changes, the flow rate of the other gas changes accordingly, so that the hydrogen and oxygen are maintained at an equivalent ratio of near 1 for efficient combustion.

[0029] like Figure 2As shown: a hydrogen gas collecting chamber 18 is provided inside the combustion chamber head 1, and the hydrogen gas collecting chamber 18 is connected with seven combustion chamber hydrogen inlets 7 at the end of the combustion chamber head 1; the inner diameter of each combustion chamber hydrogen inlet 7 is 35 mm; the hydrogen gas collecting chambers 18 corresponding to different units are separated by partitions; the hydrogen in the hydrogen gas collecting chamber 18 passes through the hydrogen air distribution plate 14 and enters the micro-mixed combustion nozzle 11 through the nozzle hydrogen inlet 112;

[0030] like Figure 2 As shown: thirteen combustion chamber oxygen inlets 8 are arranged on the outside of the combustion chamber head 1, and the combustion chamber oxygen inlet 8 is connected to the oxygen collecting chamber 19 in the combustion chamber head 1. The inner diameter of the combustion chamber oxygen inlet 8 is 25 mm, and the oxygen collecting chambers 19 corresponding to different units are separated by partitions; the oxygen in the oxygen collecting chamber 19 passes through the oxygen air distribution plate A15 and the oxygen air distribution plate B16, and enters the micro-mixed combustion nozzle 11 through the nozzle oxygen inlet 113.

[0031] like Figure 1-3 As shown: a dilution gas inlet 6 is provided on the casing 4, and a flow channel for conveying dilution gas is formed between the casing 4 and the combustion chamber partition 5 and the flame tube 3, the flow channel is connected with the dilution gas inlet 6, and the dilution gas passes through the flow channel and then enters the micro-mixing combustion nozzle 11 through the nozzle dilution gas inlet 111.

[0032] like Figure 1 As shown: there are eight axially graded nozzles 2, which are evenly distributed on the flame tube 3 in the circumferential direction, and are arranged in a single row or multiple rows. An independent regulating valve is provided on the intake pipe of the axially graded nozzle 2 for online flow control; the axially graded nozzle 2 itself can be a nozzle with a fixed intake area or a nozzle with an adjustable intake area, that is, a single axially graded nozzle itself can also have a graded load adjustment capability, further enhancing the load adjustment capability of the combustion chamber;

[0033] like Figure 2 As shown: a cooling end plate A12 and a cooling end plate B13 are arranged near the nozzle outlet 114 of the micro-mixed combustion nozzle 11. The cooling end plate A12 is densely covered with impact film cooling holes 121, and the cooling end plate B13 is provided with air film cooling holes 131 and divergent cooling holes 132. The incoming dilution gas impacts the cooling end plate B13 and is cooled from the air film cooling holes 131 and divergent cooling holes 132 provided on the cooling end plate B13. The small holes opened in the cooling end plate A12 and the cooling end plate B13 are arranged alternately. The small hole cooling gas jet of the cooling end plate A12 impacts the downstream cooling end plate B13 to achieve impact cooling. The gas entering the cooling cavity formed by the two layers of end plates and the side wall of the head flows out from the small holes of the cooling end plate B13. The axis of the small hole of the cooling end plate B13 is perpendicular to the normal of the end plate or at an angle of 1-89° to achieve divergent or air film cooling. The diameters of the impact film cooling holes 121 and the air film cooling holes 131 are between 0.2-3 mm.

[0034] The lip edge of the nozzle outlet 114 protrudes 4 mm on the cooling end plate A12, forming a small backflow between the nozzles that is beneficial to flame stabilization and reducing the load on the end plate cooling.

[0035] The straight section of the flame tube 3 is provided with beveled air film cooling holes 31, and the inclined section of the flame tube 3 is provided with spoiler ribs 32. The beveled air film cooling holes 31 and the spoiler ribs 32 are used to cool the temperature of the flame tube 3; the diameter of the beveled air film cooling hole 31 is 0.2-4mm, and the axis of the beveled air film cooling hole 31 and the normal of the surface at which it is located are at an angle of 1-89°. When the cross-section of the flame tube 3 is circular, the beveled air film cooling holes 31 are evenly distributed along the cross-sectional circumference perpendicular to the axis of the flame tube 3, and the velocity component along the cross-sectional circumference should be able to cut out a complete circle.

[0036] Working principle: A hydrogen-oxygen micro-mixed combustion chamber, firstly introduces water vapor from the dilution gas inlet 6 to form a water vapor atmosphere in the entire combustion chamber flow channel, and then hydrogen enters the hydrogen collecting chamber 18 through the combustion chamber hydrogen inlet 7. In the ignition stage, only the combustion chamber hydrogen inlet 7 corresponding to the central duty unit introduces hydrogen, and at the same time, oxygen is introduced into the combustion chamber oxygen inlet 8 corresponding to the unit at a molar ratio of 4:1 with hydrogen. After successful ignition, hydrogen is introduced into the combustion chamber hydrogen inlet 7 corresponding to the units in different sectors according to the variable load demand. The hydrogen and oxygen in this combustion chamber are adjusted simultaneously, that is, the unit that does not introduce hydrogen will not introduce oxygen into its corresponding combustion chamber oxygen inlet 8. When hydrogen is introduced into a certain unit, oxygen is also introduced into the corresponding oxygen inlet at a molar ratio of 4:1 to ensure efficient combustion and prevent residual hydrogen or oxygen from accumulating in the combustion chamber. The steam entering the combustion chamber passes through the flow channel formed by the flame tube 3, the casing 4, and the combustion chamber partition 5, and respectively flows to the nozzle dilution gas inlet 111 of the micro-mixed combustion nozzle 11 and the impact film cooling hole 121 on the cooling end plate A12. Among them, the steam flowing to the cooling end plate A12 flows through the air film cooling hole 131 and the divergent cooling hole 132 on the cooling end plate B13 in sequence, forming a protective cold air film on the surface of the cooling end plate B13 facing the combustion chamber. A part of the steam flowing in the flow channel formed by the flame tube 3, the casing 4, and the combustion chamber partition 5 flows to the oblique air film cooling hole 31 on the flame tube 3, forming a protective cold air film on the inner wall of the flame tube. The steam entering the micro-mixed combustion nozzle 11 fills the nozzle, and separates the two highly active gases when hydrogen and oxygen enter the nozzle through the nozzle hydrogen inlet 112 and the nozzle oxygen inlet 113 respectively. Multiple jets are quickly mixed to form a hydrogen-oxygen-steam mixture of a certain concentration. When the mixture flows through the straight pipe section downstream of the nozzle, the mixing of gases of different components continues, and a nearly homogeneous premixed gas is formed at the nozzle outlet 114. When combustion occurs, small flames are anchored near different nozzle outlets, and each unit nozzle forms an array of small flames.

[0037] The oxygen collecting chamber 19 is divided into three layers along the circumference of the combustion chamber. The middle layer is directly connected to the oxygen inlet 8 of the combustion chamber. The upper and lower layers are separated by the oxygen air distribution plate A15 and the oxygen air distribution plate B16 respectively. There are multiple holes on the distribution plate, among which the holes on the oxygen air distribution plate A15 are only directly connected to the nozzle oxygen inlet 113 of the sector unit nozzle. The oxygen collecting chambers 19 between different sector units are separated by partitions, and the oxygen intake is independently controlled through different combustion chamber oxygen inlets 8. The holes on the oxygen air distribution plate B16 are only directly connected to the nozzle oxygen inlet 113 of the central duty unit nozzle, and are also independently intake through its corresponding combustion chamber oxygen inlet 8.

[0038] When combustion occurs, the steam passing through the beveled film cooling hole 31 has a velocity component along the wall direction, so less steam airflow penetrates into the internal flow field. Moreover, since it has a velocity component that sticks to the wall and the velocity component along the circumferential direction can be cut into a circle, it is easier to form a protective air film between the small holes to protect the wall of the flame tube. Spoiler ribs 32 are arranged in the inclined section of the flame tube to increase the heat dissipation area of ​​the flame tube wall. The steam passing through the flow channel sandwiched by the flame tube 3 and the combustion chamber partition 5 can take away more heat from the flame tube wall, thereby also protecting the wall of the flame tube 3.

[0039] As the heat load increases further, or to avoid the need to adjust the load at the thermoacoustic oscillation state point, the axially graded nozzle 2 can be partially or fully put into operation. In addition to adjusting the number of nozzles in operation, a single axially graded nozzle itself can also have the ability to adjust the load.

[0040] The gas used to dilute hydrogen and oxygen involved in the present invention is preferably water vapor, because it has various ways of obtaining it and is a combustion product of hydrogen and oxygen. It can play a role in the hydrogen production and hydrogen use industry chain to the greatest extent. However, the combustion chamber structure involved in the present invention is not limited to the use of water vapor as the dilution gas. In special scenarios that may be used in the future, other types of non-flammable gases can also be used as dilution gases, which will not affect the function of the combustion chamber.

[0041] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A hydrogen-oxygen slight mixing combustion chamber, the combustion chamber is arranged inside a casing (4), characterized in that: The combustion chamber comprises a combustion chamber head (1), an axially graded nozzle (2) and a flame tube (3); the combustion chamber head (1) is provided with six sector units and a central circular duty unit, each unit is formed by an array of multiple micro-mixed combustion nozzles (11); the axially graded nozzles (2) are evenly distributed on the flame tube (3) in a circumferential direction and are arranged in a single row or multiple rows; Each micro-mixed combustion nozzle (11) is provided with a nozzle dilution gas inlet (111), a nozzle hydrogen inlet (112), and a nozzle oxygen inlet (113); A hydrogen gas collecting chamber (18) is provided inside the combustion chamber head (1), and the hydrogen gas collecting chamber (18) is connected to seven combustion chamber hydrogen inlets (7) at the end of the combustion chamber head (1); the hydrogen gas collecting chambers (18) corresponding to different units are separated by a partition; the hydrogen in the hydrogen gas collecting chamber (18) passes through the hydrogen air distribution plate (14) and then enters the micro-mixed combustion nozzle (11) through the nozzle hydrogen inlet (112); Thirteen combustion chamber oxygen inlets (8) are arranged on the outside of the combustion chamber head (1), and the combustion chamber oxygen inlets (8) are connected to the oxygen collecting chamber (19) in the combustion chamber head (1), and the oxygen collecting chambers (19) corresponding to different units are separated by partitions; the oxygen in the oxygen collecting chamber (19) passes through the oxygen air distribution plate A (15) and the oxygen air distribution plate B (16), and enters the micro-mixed combustion nozzle (11) through the nozzle oxygen inlet (113); the inner diameter of each combustion chamber hydrogen inlet (7) is 35 mm; the inner diameter of each combustion chamber oxygen inlet (8) is 25 mm; The casing (4) is provided with a dilution gas inlet (6), and a flow channel for conveying dilution gas is formed between the casing (4), the combustion chamber partition (5) and the flame tube (3), and the flow channel is connected to the dilution gas inlet (6). The dilution gas passes through the flow channel and then enters the micro-mixing combustion nozzle (11) through the nozzle dilution gas inlet (111); A cooling end plate A (12) and a cooling end plate B (13) are arranged near the nozzle outlet (114) of the micro-mixed combustion nozzle (11), the cooling end plate A (12) is densely covered with impact film cooling holes (121), and the cooling end plate B (13) is provided with air film cooling holes (131) and divergent cooling holes (132), the incoming dilution gas impacts the cooling end plate B (13), and is cooled by the air film cooling holes (131) and the divergent cooling holes (132) on the cooling end plate B (13), and the diameters of the impact film cooling holes (121) and the air film cooling holes (131) are between 0.2 and 3 mm; The nozzle dilution gas inlet (111) is provided with eight, the nozzle hydrogen inlet (112) is provided with four, and the nozzle oxygen inlet (113) is provided with four. From the upstream to the downstream of the micro-mixed combustion nozzle (11), the nozzle hydrogen inlet (112), the nozzle dilution gas inlet (111), and the nozzle oxygen inlet (113) are arranged in sequence. The gas nozzle inlets of the same type are evenly distributed on the micro-mixed combustion nozzle (11) in the circumferential direction. The lip edge of the nozzle outlet (114) protrudes 4 mm on the cooling end plate A (12); an independent regulating valve is arranged on the air inlet pipe of the axially graded nozzle (2) for online flow control; the straight section of the flame tube (3) is provided with an oblique film cooling hole (31), and the inclined section of the flame tube (3) is provided with a spoiler rib (32), and the oblique film cooling hole (31) and the spoiler rib (32) are used to cool the temperature of the flame tube (3); the oblique film cooling hole (3 1) has a diameter of 0.2-4 mm, the axis of the beveled air film cooling hole (31) and the normal of the curved surface at which it is located form an angle of 1-89°, and when the cross-section of the flame tube (3) is circular, the beveled air film cooling holes (31) are evenly distributed along the circumference of the cross-section perpendicular to the axis of the flame tube (3); the main body of the micro-mixed combustion nozzle (11) is a cylindrical long tube, the inner diameter of the micro-mixed combustion nozzle (11) is between 2-12 mm, and the length is between 5-100 mm.

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