Combustion chamber head, combustion chamber and organization combustion method

Abstract

The invention relates to a combustion chamber head, a combustion chamber and a combustion organization method. Wherein the combustion chamber head comprises an exhaust side comprising: a central mixer, an annular mixer surrounding the central mixer, comprising a radial wall and a circumferential wall; wherein the radial wall is provided with a fuel hole; the circumferential wall is provided with air holes, the air holes comprise a first hole and a second hole, the first hole is located on the axial upstream of the second hole, the air injection area of the first hole is a first combustion area, the equivalence ratio of the first combustion area is larger than 1, the air injection area of the second hole is a second combustion area, and the equivalence ratio of the second combustion area is smaller than 1. In this way, stable combustion is achieved, and NOx emission is reduced.

Description

Technical Field

[0001] The technical field of the invention relates to a combustion chamber head, a combustion chamber and a method for organizing combustion. Background Art

[0002] In order to achieve net zero carbon emissions in aviation, clean energy hydrogen is used as a power fuel. The only product of hydrogen combustion is water, which is clean and renewable. Compared with liquid fuel, hydrogen has a higher combustion temperature, a faster flame propagation speed, and a wider stable operating range. At the same time, the calorific value of hydrogen combustion is about three times that of aviation kerosene, which can greatly reduce the amount of hydrogen used when consuming the same amount of air.

[0003] Since hydrogen has a higher theoretical combustion temperature, it is more likely to produce a large amount of pollutants, nitrogen oxides (NOx). In order to reduce NOx emissions from hydrogen combustion, lean or rich hydrogen combustion is usually used to deviate the fuel / air ratio from the chemically appropriate ratio, thereby reducing the temperature of the main combustion zone. In addition, hydrogen combustion not only has hazards such as a wide explosion range and great power, but also faces catastrophic problems such as spontaneous combustion, flashback, and flammability and explosion. Therefore, if hydrogen is used as the only fuel for a power plant, it is necessary to design a hydrogen fuel combustion organization form to achieve effective emission reduction, stable and safe combustion. Summary of the invention

[0004] The object of the present invention is to provide a combustion chamber head.

[0005] Another object of the present invention is to provide a combustion chamber.

[0006] Another object of the present invention is to provide a method for tissue burning.

[0007] A combustion chamber head according to one aspect of the present invention includes an exhaust side, and the exhaust side includes: a central mixer, including a central radial wall and a central circumferential wall, and the central circumferential wall forms a central chamber around the central radial wall; an annular mixer, surrounding the central mixer, including an annular radial wall, an annular circumferential inner wall and an annular circumferential outer wall, the annular circumferential outer wall surrounds the annular circumferential inner wall, and the annular circumferential outer wall and the annular circumferential inner wall form an annular chamber around the annular radial wall; wherein the central radial wall and the annular radial wall are provided with fuel holes to inject fuel into the central chamber and the annular chamber; the central circumferential wall, the annular circumferential inner wall and the annular circumferential outer wall are provided with air holes to inject air into the central chamber and the annular chamber; the air holes include a first hole and a second hole, the first hole is located axially upstream of the second hole, the air injection area of ​​the first hole is a first combustion zone, and the equivalence ratio of the first combustion zone is greater than 1, and the air injection area of ​​the second hole is a second combustion zone, and the equivalence ratio of the second combustion zone is less than 1.

[0008] The technical solution of the present application forms a hydrogen-rich combustion zone and a hydrogen-poor combustion zone by setting a first hole and a second hole in conjunction with a fuel hole, thereby reducing the temperature of the combustion area and reducing NOx emissions. At the same time, the gas modes of air and hydrogen are relatively independent and are not pre-mixed. Instead, diffusion combustion is adopted, and they are mixed and burned at the same time to ensure flame stability, prevent spontaneous combustion and flashback, and reduce the risk of explosion. In addition, both the hydrogen-rich zone and the hydrogen-poor zone are located in the chamber, making the structure more compact and shortening the length of the combustion chamber head, which can reduce the spatial size of the engine used, reduce the weight of the engine, and improve combustion efficiency.

[0009] In one or more embodiments of the combustion chamber head, the exhaust side includes a plurality of annular mixers, which are concentric with the central mixer and distributed from inside to outside in the radial direction.

[0010] In one or more embodiments of the combustion chamber head, the equivalence ratio of the first combustion zone is 1.5-2, and the equivalence ratio of the second combustion zone is 0.3-0.6.

[0011] In one or more embodiments of the combustion chamber head, the outlet end of the first hole is located axially upstream of the inlet end of the first hole, and the center line of the second hole is perpendicular to the wall surface where the second hole is located.

[0012] In one or more embodiments of the combustion chamber head, the center line of the fuel hole is parallel to the axis of the combustion chamber head, and the angle between the center line of the first hole and the center line of the fuel hole is 20° to 30°.

[0013] In one or more embodiments of the combustion chamber head, the plurality of air holes are evenly distributed along the circumference, and the aperture of the air holes is 0.8 to 1.5 mm; the central circumferential wall includes 10 to 15 of the first holes and 10 to 15 of the second holes; the annular circumferential inner wall and the annular circumferential outer wall each include 20 to 30 of the first holes and 20 to 30 of the second holes.

[0014] In one or more embodiments of the combustion chamber head, the central radial wall is provided with one fuel hole, and the annular radial wall is provided with 20 to 30 fuel holes evenly distributed circumferentially.

[0015] In one or more embodiments of the combustion chamber head, the flow area of ​​the central chamber and the flow area of ​​the annular chamber gradually increase from upstream to downstream.

[0016] In one or more embodiments of the combustion chamber head, the combustion chamber head also includes an air intake side, which includes: a fuel pipeline, including a fuel main pipe and a fuel branch pipe; a central fuel chamber, the downstream side of the central fuel chamber is connected to the fuel hole fluid of the central mixer, and the upstream side of the central fuel chamber is connected to the fuel main pipe fluid; an annular fuel chamber, the downstream end of the annular fuel chamber is connected to the fuel hole fluid of the annular mixer, and the upstream end of the annular fuel chamber is connected to the central fuel chamber fluid through the fuel branch pipe.

[0017] In one or more embodiments of the combustion chamber head, the combustion chamber head also includes a shell, which surrounds the annular mixer located radially outside, the upstream edge of the shell defines the air entry area, and the downstream edge of the shell is connected to the annular circumferential outer wall.

[0018] A combustion chamber according to another aspect of the present invention comprises the combustion chamber head as described above.

[0019] According to another aspect of the present invention, a method for organizing combustion includes: obtaining hydrogen as fuel, setting a central mixing chamber at the center of the combustion chamber head and setting a plurality of annular mixing chambers radially from the inside to the outside;

[0020] Hydrogen is sprayed out as a first fuel flow through the fuel holes on the radial wall of the central mixing chamber, and multiple second fuel flows are sprayed out through the multiple fuel holes on the radial wall of the annular mixing chamber; air is sprayed out as multiple first air flows through the multiple first air holes on the circumferential wall of the central mixing chamber and the multiple annular mixing chambers, and multiple second air flows are sprayed out through the multiple second air holes on the circumferential wall of the central mixing chamber and the multiple annular mixing chambers, and the first air flow is located axially upstream of the second air flow; wherein the first fuel and the multiple second fuel flows are respectively mixed with the multiple first air flows to form multiple first mixed flows, and the multiple first mixed flows are respectively mixed with the multiple second air flows to form multiple second mixed flows, the equivalence ratio of the first mixed flow is greater than 1, and the equivalence ratio of the second mixed flow is less than 1; wherein the multiple first mixed flows and the multiple second mixed flows burn to form multiple flames, and the multiple flames are interconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments. In the accompanying drawings, the same reference numerals always represent the same features. It should be noted that these drawings are only examples and are not drawn according to the conditions of equal scale, and should not be used as a limitation on the actual scope of protection required by the present invention, wherein:

[0022] Figure 1 It is a schematic structural diagram of a combustion chamber head according to an embodiment.

[0023] Figure 2 Based on Figure 1 A schematic diagram of the structure of the combustion chamber head is shown in the A direction viewing angle.

[0024] Figure 3 The present invention is a flowchart of the steps of a tissue combustion method according to an embodiment.

[0025] Reference numerals:

[0026] 100-combustion chamber head;

[0027] 200-exhaust side;

[0028] 300-intake side;

[0029] 1- Central mixer;

[0030] 10-Central chamber, 11-Central radial wall, 12-Central circumferential wall

[0031] 2- Ring mixer;

[0032] 20- annular chamber;

[0033] 21-annular radial wall, 22-annular circumferential inner wall, 23-annular circumferential outer wall;

[0034] 3-Fuel hole;

[0035] 4- Air holes;

[0036] 41-first hole, 42-second hole;

[0037] 5-Fuel pipeline;

[0038] 51- fuel main pipe, 52- fuel branch pipe;

[0039] 61-central fuel chamber, 62-annular fuel chamber;

[0040] 7- housing;

[0041] 71 - upstream edge of the shell, 72 - downstream edge of the shell.

[0042] 400-Tissue burning method. DETAILED DESCRIPTION

[0043] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. Although the present invention will be described in conjunction with the exemplary embodiments, it should be appreciated that this specification is not intended to limit the present invention to those exemplary embodiments. On the contrary, the present invention is intended to cover not only these exemplary embodiments, but also various alternative forms, modifications, equivalent forms and other embodiments that may be included within the spirit and scope of the present invention as defined by the appended claims.

[0044] In the following description, the orientation or positional relationship indicated by "axial", "circumferential", "radial", "inner", "outer", "upstream", "downstream" or other directional terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The directional terms "axial", "circumferential" and "radial" are based on the head of the combustion chamber. "Upstream" and "downstream" are distinguished based on the direction of fluid flow. Specifically, hydrogen flows from "upstream" to "downstream".

[0045] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment" and / or "an embodiment" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0046] Flowcharts are used in this application to illustrate the operations performed by the system according to the embodiments of the application. It should be understood that the preceding or following operations are not necessarily performed precisely in order. Other operations may also be added to these processes, or one or more operations may be removed from these processes.

[0047] refer to Figure 1 , Figure 2As shown, in one embodiment, the combustion chamber includes a combustion chamber head 100, and the meaning of "combustion chamber head" refers to the main component for organizing fuel and air injection, mixing and guiding in the combustion chamber of a gas turbine or an aircraft engine. The specific structure of the combustion chamber head 100 can be, including an exhaust side 200. The exhaust side 200 includes a central mixer 1 and an annular mixer 2, and the meaning of "mixer" refers to a structural component that mixes and burns a fuel such as hydrogen and an oxidant such as air. The central mixer 1 includes a central radial wall 11 and a central circumferential wall 12, and the central circumferential wall 12 surrounds the central radial wall 11 to form a central chamber 10. The annular mixer 2 surrounds the central mixer 1, including an annular radial wall 21, an annular circumferential inner wall 22 and an annular circumferential outer wall 23, the annular circumferential outer wall 23 surrounds the annular circumferential inner wall 22, and the annular circumferential outer wall 23 and the annular circumferential inner wall 22 surround the annular radial wall 21 to form an annular chamber 20. The meanings of "central chamber 10" and "annular chamber 20" refer to the area where the fuel and the oxidant are mixed and burned. Among them, the central radial wall 11 and the annular radial wall are provided with fuel holes 3 to inject fuel. The central circumferential wall 12, the annular circumferential inner wall 22 and the annular circumferential outer wall 23 are provided with air holes 4 to inject air. The air holes 4 include a first hole 41 and a second hole 42. The first hole 41 is located axially upstream of the second hole 42. The air injection area of ​​the first hole 41 is the first combustion zone. The equivalence ratio of the first combustion zone is greater than 1, preferably 1.5 to 2. The air injection area of ​​the second hole 42 is the second combustion zone. The equivalence ratio of the second combustion zone is less than 1, preferably 0.3 to 0.6. Specifically, as Figure 1 As shown, after hydrogen a is ejected from the fuel hole 3, it burns in two areas in the central chamber 10 and the annular chamber 20, namely the first combustion area and the second combustion area. The air b ejected from the first hole 41 mixes with the hydrogen a and diffuses and burns, forming hydrogen-rich combustion, reducing the temperature of the first combustion area and reducing NOx emissions. The air b ejected from the second hole 42 further dilutes the fuel gas of the previous stage, so that there is a large amount of air around the diffusion flame, greatly reducing the equivalence ratio and achieving hydrogen-lean combustion. The hydrogen-lean combustion further reduces the temperature of the second combustion area and further reduces NOx emissions.

[0048] The beneficial effect of adopting the above embodiment is that by setting the first hole and the second hole in conjunction with the fuel hole, a hydrogen-rich combustion zone and a hydrogen-poor combustion zone are formed, the temperature of the combustion area is reduced, and NOx emissions are reduced. At the same time, the gas modes of air and hydrogen are relatively independent, and are not pre-mixed. Instead, diffusion combustion is adopted, and they are mixed and burned at the same time to ensure flame stability, prevent spontaneous combustion and flashback, and reduce the risk of explosion. In addition, both the hydrogen-rich zone and the hydrogen-poor zone are located in the chamber, making the structure more compact, shortening the length of the combustion chamber head, and reducing the space size of the engine used, reducing the weight of the engine, and improving the combustion efficiency.

[0049] refer to Figure 1 Combination Figure 2 As shown, in one embodiment, the specific structure of the combustion chamber head 100 can be that the exhaust side 200 includes a plurality of annular mixers 2, which are concentric with the central mixer 1 and are distributed from the inside to the outside in the radial direction. The beneficial effect of such a setting is that after the hydrogen a is ejected through the fuel hole, a diffusion flame is formed in the central chamber and the annular chamber, and the chambers are interconnected to achieve a cross-flame effect, further enhancing the flame stability. In one embodiment, 2-5 annular mixers 2 are preferably provided, and the radial cross-sectional volume of the central chamber and the annular chamber is the same.

[0050] refer to Figure 1 As shown, in one embodiment, the specific structure of the air hole 4 can be that the outlet end of the first hole 41 is located axially upstream of the inlet end of the first hole 41, that is, the first hole 41 is an inclined hole, so that the air b can be directly sprayed to the exhaust end of the fuel hole 3, which helps to achieve the rapid mixing and combustion of hydrogen a with air b after being sprayed out. Preferably, the center line of the fuel hole 3 is parallel to the axis of the combustion chamber head, and the angle between the center line of the first hole 41 and the center line of the fuel hole 3 is 20° to 30°. The center line of the second hole 42 is perpendicular to the wall surface where it is located, that is, the center line of the second hole 42 located on the central circumferential wall 12 is perpendicular to the central circumferential wall 12, the center line of the second hole 42 located on the annular circumferential inner wall 22 is perpendicular to the annular circumferential inner wall 22, and the center line of the second hole 42 located on the annular circumferential outer wall 23 is perpendicular to the annular circumferential outer wall 23, so as to form a partition.

[0051] refer to Figure 1 Combination Figure 2 As shown, in one embodiment, the specific structure of the air hole 4 can be that a plurality of air holes 3 are evenly distributed along the circumference, and the aperture of the air hole 4 is 0.8-1.5 mm; the central circumferential wall 12 includes 10-15 first holes 41 and 10-15 second holes 42; the annular circumferential inner wall 22 and the annular circumferential outer wall 23 each include 20-30 first holes 41 and 20-30 second holes 42. The air flow rate entering the central chamber 10 and the annular chamber 20 is controlled by adjusting the number and aperture of the first holes 41 and the second holes 42, so as to obtain a better stable combustion flame and lower NOx emissions. At the same time, in addition to temperature, the factors affecting the generation of pollutants NOx also include residence time. Compared with a large and long flame, the present application forms many small flames, which can obtain lower NOx emissions.

[0052] Continue to refer Figure 1 Combination Figure 2As shown, the specific structure of the fuel hole 3 can be that the central radial wall 11 is provided with one fuel hole 3, and the annular radial wall 21 is provided with 20 to 30 circumferentially evenly distributed fuel holes 3. Because the air flow near the wall is small, the present application sets multiple annular zones to realize the partition control of hydrogen flow. In different annular channels, by changing the aperture of the fuel hole and matching the hydrogen and air flow ratio, the temperature of each zone is uniform and NOx emissions are reduced.

[0053] refer to Figure 1 As shown, in one embodiment, the specific structure of the combustion chamber head 100 can be that the flow area of ​​the central chamber 10 and the flow area of ​​the annular chamber 20 gradually increase from upstream to downstream, that is, the cross-section is conical and gradually expands along the airflow direction, and hydrogen a and air b are easy to reflux and burn stably in the chamber, thereby making the combustion chamber head structure compact, shortening the combustion chamber length, reducing the engine weight, and improving the combustion efficiency.

[0054] refer to Figure 1 Combination Figure 2 As shown, in one embodiment, the combustion chamber head 100 also includes an air intake side 300, and the air intake side 300 includes a fuel pipeline 5, a central fuel chamber 61 and an annular fuel chamber 62. The fuel pipeline 5 includes a fuel main pipe 51 and a fuel branch pipe 52. The downstream side of the central fuel chamber 61 is connected to the fluid of the fuel hole 3 of the central mixer 1, and the upstream side of the central fuel chamber 61 is connected to the fluid of the fuel main pipe 51. The downstream end of the annular fuel chamber 62 is connected to the fluid of the fuel hole 3 of the annular mixer 2, and the upstream end of the annular fuel chamber 62 is connected to the fluid of the central fuel chamber 61 through the fuel branch pipe 52. The central fuel chamber 61 is a cylindrical hydrogen gas collecting cavity. In one embodiment, multiple annular fuel chambers 62 are connected to each other through the fuel branch pipe 52 fluid, so that the structure is compact and convenient for flow path construction. Hydrogen a enters the central fuel chamber 61 through the fuel main pipe 51, then enters the annular fuel chamber 62 through the fuel branch pipe 52, and enters the central chamber 10 and the annular chamber 20 through the fuel hole 3, where it is mixed and burned with the air b.

[0055] refer to Figure 1 Combination Figure 2 As shown, in one embodiment, the specific structure of the combustion chamber head 100 can also be, including a shell 7, the shell 7 surrounds the annular mixer 2 located on the radial outside, the upstream edge 71 of the shell defines the entry area of ​​the air b, and the downstream edge 72 of the shell is connected to the annular circumferential outer wall 23. In one embodiment, the overall structure of the combustion chamber head 100 is integrated by additive manufacturing to solve the problem of complex flow channel structure and air leakage. Air b enters the shell 7 from the intake side 300, and then enters the central chamber 10 and the annular chamber 20 through the air hole 4 to participate in combustion.

[0056] refer to Figure 3As shown, in one embodiment, the specific steps of the tissue burning method 400 may include:

[0057] Hydrogen is obtained as fuel, a central mixing chamber is arranged at the center of the combustion chamber head, and a plurality of annular mixing chambers are arranged radially from the inside to the outside;

[0058] Allow hydrogen to spray out a first fuel flow through a fuel hole in a radial wall of a central mixing chamber, and spray out a plurality of second fuel flows through a plurality of fuel holes in a radial wall of an annular mixing chamber;

[0059] The air is ejected into a plurality of first air streams through a plurality of first air holes in the circumferential wall of the central mixing chamber and the circumferential walls of the plurality of annular mixing chambers, and a plurality of second air streams are ejected into a plurality of second air streams through a plurality of second air holes in the circumferential wall of the central mixing chamber and the circumferential walls of the plurality of annular mixing chambers, wherein the first air stream is located axially upstream of the second air stream;

[0060] wherein the first fuel and the plurality of second fuel flows are respectively mixed with the plurality of first air flows to form a plurality of first mixed flows, the plurality of first mixed flows are respectively mixed with the plurality of second air flows to form a plurality of second mixed flows, the equivalence ratio of the first mixed flows is greater than 1, and the equivalence ratio of the second mixed flows is less than 1;

[0061] The plurality of first mixed flows and the plurality of second mixed flows burn to form a plurality of flames, and the plurality of flames are interconnected.

[0062] The hydrogen and air are diffused and burned after being relatively independently taken in, which prevents spontaneous combustion, flashback and explosion, and achieves stable combustion. The hydrogen and air ratio is controlled by zoning, thereby controlling the temperature of the combustion zone and minimizing NOx emissions.

[0063] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A combustion chamber head, It is characterized in that comprising an exhaust side, the exhaust side comprising: A central mixer, comprising a central radial wall and a central circumferential wall, wherein the central circumferential wall surrounds the central radial wall to form a central chamber; an annular mixer, surrounding the central mixer, comprising an annular radial wall, an annular circumferential inner wall and an annular circumferential outer wall, wherein the annular circumferential outer wall surrounds the annular circumferential inner wall, and the annular circumferential outer wall and the annular circumferential inner wall surround the annular radial wall to form an annular chamber; Wherein, the central radial wall and the annular radial wall are provided with fuel holes to spray fuel into the central chamber and the annular chamber; the central circumferential wall, the annular circumferential inner wall and the annular circumferential outer wall are provided with air holes to spray air into the central chamber and the annular chamber; the air holes include a first hole and a second hole, the first hole is located axially upstream of the second hole, the air spraying area of ​​the first hole is a first combustion zone, the equivalence ratio of the first combustion zone is greater than 1, and the air spraying area of ​​the second hole is a second combustion zone, and the equivalence ratio of the second combustion zone is less than 1.

2. The combustion chamber head according to claim 1, It is characterized in that The exhaust side includes a plurality of annular mixers, which are concentric with the central mixer and distributed from inside to outside in the radial direction.

3. The combustion chamber head according to claim 1, It is characterized in that The equivalence ratio of the first combustion zone is 1.5-2, and the equivalence ratio of the second combustion zone is 0.3-0.

6.

4. The combustion chamber head according to claim 1, It is characterized in that The air outlet end of the first hole is located axially upstream of the air inlet end of the first hole, and the center line of the second hole is perpendicular to the wall surface where the second hole is located.

5. The combustion chamber head according to claim 4, It is characterized in that The center line of the fuel hole is parallel to the axis of the combustion chamber head, and the angle between the center line of the first hole and the center line of the fuel hole is 20° to 30°.

6. The combustion chamber head according to claim 1, It is characterized in that The multiple air holes are evenly distributed along the circumference, and the diameter of the air holes is 0.8-1.5 mm; the central circumferential wall includes 10-15 first holes and 10-15 second holes; the annular circumferential inner wall and the annular circumferential outer wall each include 20-30 first holes and 20-30 second holes.

7. The combustion chamber head according to claim 1, It is characterized in that The central radial wall is provided with one fuel hole, and the annular radial wall is provided with 20 to 30 fuel holes evenly distributed in the circumferential direction.

8. The combustion chamber head according to claim 1, It is characterized in that The flow area of ​​the central chamber and the flow area of ​​the annular chamber gradually increase from upstream to downstream.

9. The combustion chamber head according to claim 1, It is characterized in that The combustion chamber head also includes an intake side, which includes: Fuel pipelines, including fuel mains and fuel branch pipes; a central fuel chamber, a downstream side of the central fuel chamber being in fluid communication with a fuel orifice of the central mixer, and an upstream side of the central fuel chamber being in fluid communication with the fuel manifold; An annular fuel chamber, wherein the downstream end of the annular fuel chamber is fluidly connected to the fuel hole of the annular mixer, and the upstream end of the annular fuel chamber is fluidly connected to the central fuel chamber through the fuel branch pipe.

10. The combustion chamber head according to claim 2, It is characterized in that The combustion chamber head also includes a casing, which surrounds the annular mixer located at the radial outer side, an upstream edge of the casing defines an air inlet area, and a downstream edge of the casing is connected to the annular circumferential outer wall.

11. A combustion chamber, It is characterized in that Comprising a combustion chamber head as described in any one of claims 1-10.

12. A method for burning tissue, It is characterized in that include: Hydrogen is obtained as fuel, a central mixing chamber is arranged at the center of the combustion chamber head, and a plurality of annular mixing chambers are arranged radially from the inside to the outside; Allow hydrogen to spray out a first fuel flow through the fuel holes on the radial wall of the central mixing chamber, and spray out a plurality of second fuel flows through a plurality of fuel holes on the radial wall of the annular mixing chamber; Allow air to be ejected into a plurality of first air flows through a plurality of first air holes in the circumferential wall of the central mixing chamber and the circumferential walls of the plurality of annular mixing chambers, and eject a plurality of second air flows through a plurality of second air holes in the circumferential wall of the central mixing chamber and the circumferential walls of the plurality of annular mixing chambers, wherein the first air flows are located axially upstream of the second air flows; The first fuel and the plurality of second fuel flows are respectively mixed with the plurality of first air flows to form a plurality of first mixed flows, and the plurality of first mixed flows are respectively mixed with the plurality of second air flows to form a plurality of second mixed flows, and an equivalence ratio of the first mixed flows is greater than 1, and an equivalence ratio of the second mixed flows is less than 1; The plurality of first mixed flows and the plurality of second mixed flows burn to form a plurality of flames, and the plurality of flames are interconnected.

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