Hydrogen-ammonia dual fuel burner, and gas mixing fan blade and processing technology

Abstract

The present application relates to the technical field of boiler burner, a hydrogen ammonia dual fuel burner, comprising: a gas conveying assembly, the gas conveying assembly comprises a tank body, and one gas inlet pipe is arranged on each side of the tank body; a gas mixing assembly is arranged in the tank body, the gas mixing assembly comprises a gas mixing box, the gas mixing box divides the inside of the tank body into a first chamber and a second chamber, the two gas inlet pipes are communicated with the first chamber and the second chamber respectively, and the top surface and the bottom surface of the gas mixing box are both provided with a gas inlet; a combustion assembly is arranged on the outside of the tank body, the combustion assembly comprises a cover body, and a nozzle is arranged between the cover body and the gas mixing box.In the present application, the two gas inlet pipes are arranged on the side walls on both sides of the tank body, and the space occupied is smaller, so as to adapt to the narrow space near the industrial boiler and ensure that the present application can be installed in place.The present application also proposes a gas mixing fan blade and a processing technology.

Description

Technical Field

[0001] This invention relates to the field of boiler burner technology, specifically to a hydrogen-ammonia dual-fuel burner, and a mixed-fuel fan blade and its processing technology. Background Technology

[0002] Burners are crucial equipment in industrial boilers. Hydrogen and ammonia are used in boiler applications. Hydrogen combustion produces only water, while ammonia combustion produces no carbon dioxide. Both have readily available raw materials, enabling green production. The addition of ammonia effectively lowers the combustion temperature. To prevent the excessively high temperatures during hydrogen-ammonia combustion from generating large amounts of nitrogen oxides, hydrogen and ammonia need to be premixed before combustion. For example, Chinese utility model patent application number CN202520234233.1 provides a hydrogen-ammonia coupled low-NOx burner. In this device, hydrogen and ammonia inlet pipes transport hydrogen and ammonia, respectively. A conical manifold is installed inside the first tank. As the hydrogen and ammonia pass through the first tank, the conical manifold concentrates the gases, thus achieving premixing.

[0003] The drawback of this device is that both air inlet pipes are located on the end face of the second tank away from the cover, resulting in a relatively long horizontal length and occupying a significant amount of space. In practical use, if the space near the industrial boiler is limited, the device cannot be installed correctly. Summary of the Invention

[0004] The purpose of this invention is to provide a hydrogen-ammonia dual-fuel burner, in which two air inlet pipes are respectively located on the side walls of the tank, shortening the horizontal length and thus occupying less space. This makes it suitable for use in confined spaces near industrial boilers, ensuring proper installation. The invention also includes a mixing fan blade and its processing technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In the first technical solution, a hydrogen-ammonia dual-fuel burner includes: a gas delivery assembly, which includes a tank body and an air inlet pipe on each side of the tank body; a gas mixing assembly, disposed inside the tank body, which includes a gas mixing box that divides the interior of the tank body into a first chamber and a second chamber, with two air inlet pipes respectively communicating with the first chamber and the second chamber, and air inlets on the top and bottom surfaces of the gas mixing box; and a combustion assembly, disposed outside the tank body, which includes a cover and a nozzle disposed between the cover and the gas mixing box.

[0006] In the first technical solution, preferably, the gas mixing assembly further includes: two drive blocks, respectively disposed in the first chamber and the second chamber, and having a mirror-symmetrical structure, wherein the drive blocks have gas delivery channels inside; and a stirring member, disposed in the gas mixing box and rotatably connected to the gas mixing box, wherein the two ends of the stirring member are respectively connected to the two drive blocks.

[0007] In the first technical solution, preferably, the end faces of the two drive blocks that are close to each other are in contact with the outer surface of the mixing box and can slide along the outer surface of the mixing box. The two ends of the air delivery channel pass through the side wall and bottom surface of the drive block, respectively, and the drive block can completely cover the air inlet.

[0008] In the first technical solution, preferably, the driving block is hemispherical, the outer surface of the driving block is provided with a plurality of radially distributed grooves, there are a plurality of air supply channels, the positions of the plurality of air supply channels correspond to the positions of the plurality of grooves, the air supply channels are connected to the grooves, and there are a plurality of air inlets, the plurality of air inlets are evenly distributed in a ring.

[0009] In the first technical solution, preferably, the middle part of the groove is provided with an air collecting groove, the air supply channel is connected to the air collecting groove, and a one-way valve is provided at the end of the air supply channel near the air inlet.

[0010] In the first technical solution, preferably, the air inlet pipe is a three-way pipe, and the end of the air inlet pipe near the tank body has a U-shaped structure. The air inlet pipe includes one air inlet end and two air outlet ends, and the two air outlet ends of the air inlet pipe are respectively located on both sides of the air collection groove.

[0011] In the first technical solution, preferably, each of the grooves is provided with a filter plate.

[0012] In the first technical solution, preferably, the stirring component includes: a transmission rod, the two ends of which pass through the top and bottom surfaces of the mixing box, respectively, and are fixedly connected to the two driving blocks; and multiple mixing fan blades, which are radially fixedly arranged in the middle of the transmission rod.

[0013] In the second technical solution, a mixing fan blade is provided, wherein the mixing fan blade is made of metal or alloy material, and the surface of the mixing fan blade is densely covered with micron-level pits formed by erosion. The depth of the micron-level pits is 20-40 microns and they are randomly distributed, which is used to generate microscale eddies when the fuel flows.

[0014] In the third technical solution, a mixed-air fan blade processing technology is used to process the mixed-air fan blade described in the second technical solution, wherein the mixed-air fan blade is made of metal or alloy material, and a liquid reagent capable of oxidizing the mixed-air fan blade is selected as the eroding agent. The air-mixing fan blade is suspended, and an etchant is sprayed onto the two main extended surfaces of the air-mixing fan blade in atomized form. The etchant droplets are kept at the micron level, and a small amount of etchant is sprayed in atomized form to avoid large-scale accumulation of etchant droplets. After stopping the spraying of the etchant, a predetermined time is maintained to allow the metal or alloy material used to make the air-mixing fan blade to fully react with the etchant, and the etchant reacts chemically with the air-mixing fan blade to form oxides. After heating the air-mixing fan blades to the first predetermined temperature, the heated air-mixing fan blades are struck. Due to the difference in the coefficient of thermal expansion between the air-mixing fan blade material and the oxide, stress concentration is formed between the air-mixing fan blade material and the oxide. During the striking process, the oxide is vibrated and falls off in a large area. After being struck, the mixing fan blades are heated to a second predetermined temperature and then quenched. The quenching process drastically reduces the temperature of the mixing fan blades, further promoting the shedding of oxides.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (i) In this invention, the two air inlet pipes are respectively located on the side walls on both sides of the tank, which shortens the length in the horizontal direction and thus occupies less space, thereby adapting to the narrow space near the industrial boiler and ensuring that the invention can be installed in place.

[0016] (ii) In this embodiment, the stirring component includes a transmission rod and several mixing fan blades. Both drive blocks can drive the transmission rod to rotate in the same direction, and the transmission rod drives the several mixing fan blades to rotate, stirring the ammonia and hydrogen in the mixing box. Because the stirring component can rotate continuously, the ammonia and hydrogen in the mixing box can be mixed evenly. Attached Figure Description

[0017] Figure 1 This is an isometric view of the present invention; Figure 2 This is a front sectional view of the present invention; Figure 3 This is an isometric sectional view of the gas delivery assembly in this invention; Figure 4 This is an isometric view of the air-fuel mixing assembly in this invention; Figure 5 This is an exploded isometric view of the air-mixing assembly in this invention; Figure 6 This is an isometric sectional view of the air-mixing box in this invention; Figure 7 This is an isometric view of the driving block in this invention; Figure 8This is a front sectional view of the driving block in this invention; Figure 9 This is an isometric view of the stirring component in this invention; Figure 10 This is an isometric sectional view of the combustion assembly in this invention; Figure 11 This is a schematic diagram showing the location of the connecting pipe in this invention; Figure 12 This is a flowchart of the air mixing fan blade processing technology in this invention.

[0018] The reference numerals in the figures include: 1-Gas delivery assembly, 11-Tank body, 111-First chamber, 112-Second chamber, 12-Inlet pipe, 2-Gas mixing assembly, 21-Gas mixing box, 211-Inlet, 22-Drive block, 221-Gas delivery channel, 222-Groove, 223-Gas collection trough, 23-Agitator, 231-Transmission rod, 232-Gas mixing fan blade, 24-One-way valve, 25-Filter plate, 3-Combustion assembly, 31-Cover body, 32-Nozzle, 321-First multi-stage shear assembly, 33-Igniter, 34-Temperature sensor, 40-Connecting pipe, 41-Second multi-stage shear assembly. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1

[0021] Please see Figure 1-10This invention provides a technical solution: a hydrogen-ammonia dual-fuel burner, comprising a gas supply assembly 1, a gas mixing assembly 2, and a combustion assembly 3. The gas supply assembly 1 includes a tank 11 and two inlet pipes 12. The gas mixing assembly 2 includes a mixing box 21, which divides the interior of the tank 11 into a first chamber 111 and a second chamber 112. The top and bottom surfaces of the mixing box 21 are each provided with an inlet 211. The combustion assembly 3 includes a cover 31 and nozzles 32. In this invention, the two inlet pipes 12 are respectively located on the side walls on both sides of the tank 11, shortening their horizontal length and thus occupying less space, thereby adapting to the limited space near industrial boilers and ensuring proper installation. In use, the cover 31 is connected to the industrial boiler. Ammonia gas enters the first chamber 111 through one of the inlet pipes 12, and hydrogen gas enters the second chamber 112 through the other inlet pipe 12. At this time, ammonia gas is at the top layer and hydrogen gas is at the bottom layer. Ammonia gas then enters the mixing chamber 21 through the top inlet 211, and hydrogen gas enters the mixing chamber 21 through the bottom inlet 211. The ammonia and hydrogen gas meet and mix evenly in the mixing chamber 21, then enter the nozzle 32 together, and finally from the nozzle 32 into the enclosure 31. An igniter 33 and a temperature sensor 34 are respectively located on both sides of the nozzle 32. The igniter 33 ignites the gas, and the temperature sensor 34 records the temperature. Circular holes on the enclosure 31 allow air to enter, ensuring complete combustion.

[0022] The mixing assembly 2 also includes two drive blocks 22 and a stirrer 23. The two drive blocks 22 are respectively located in the first chamber 111 and the second chamber 112. Each drive block 22 has a gas delivery channel 221 inside, and the stirrer 23 is located inside the mixing box 21. When ammonia enters the first chamber 111, it contacts the top drive block 22 and drives it to rotate. The top drive block 22 can then drive the stirrer 23 and the bottom drive block 22 to rotate together. When hydrogen enters the second chamber 112, it contacts the bottom drive block 22 and drives it to rotate. The bottom drive block 22 can then drive the stirrer 23 and the top drive block 22 to rotate together. Both ammonia and hydrogen can enter the inlet 211 through the gas delivery channel 221 and then enter the mixing box 21. In this embodiment, the stirring component 23 includes a transmission rod 231 and several mixing fan blades 232. Both drive blocks 22 can drive the transmission rod 231 to rotate in the same direction. The transmission rod 231 drives the several mixing fan blades 232 to rotate, stirring the ammonia and hydrogen in the mixing box 21. Because the stirring component 23 can rotate continuously, the ammonia and hydrogen in the mixing box 21 can be mixed evenly.

[0023] Please see Figure 1-8The end faces of the two drive blocks 22, which are close to each other, are in contact with the outer surface of the mixing box 21 and can slide along the outer surface of the mixing box 21. The two ends of the gas delivery channel 221 pass through the side wall and bottom surface of the drive block 22, respectively, and the drive block 22 can completely cover the air inlet 211. This ensures that the gas delivery channel 221 can be aligned with the air inlet 211, and that ammonia and hydrogen can enter the air inlet 211 from the gas delivery channel 221 and finally enter the mixing box 21. The gas in the mixing box will not return to the first chamber 111 or the second chamber 112 from the air inlet 211.

[0024] In this embodiment, the driving force for the rotation of the driving block 22 comes from gas pressure. The driving block 22 is hemispherical, and its outer surface has several radially distributed grooves 222. There are several gas delivery channels 221 and several gas inlets 211. In this embodiment, each groove 222 is connected to three gas delivery channels 221. When ammonia enters the first chamber 111, it contacts the inner wall of the groove 222, exerts a thrust on the groove 222, and drives the top driving block 22 to rotate. When hydrogen enters the second chamber 112, it also contacts the inner wall of the groove 222, exerts a thrust on the groove 222, and drives the bottom driving block 22 to rotate. Both ammonia and hydrogen can enter the gas delivery channels 221 along the inner wall of the groove 222, and then enter the mixing box 21.

[0025] Understandably, the direction and angle of the air intake pipe 12 are matched with the rotation direction of the drive block 22. The direction and angle of the air intake pipe 12 are at a certain angle to the axis of the tank 11, and can drive the drive block 22 to rotate through gas pressure.

[0026] Please see Figure 1-8 A gas collecting groove 223 is provided in the middle of the groove 222, and a one-way valve 24 is provided at the end of the gas delivery channel 221 near the gas inlet 211. When ammonia and hydrogen enter the groove 222, they first accumulate in the gas collecting groove 223, and then enter different gas delivery channels 221 respectively. This ensures that an equal amount of gas enters each of the three gas delivery channels 221 connected to the same groove 222. The one-way valve 24 ensures that ammonia or hydrogen can only enter the mixing box 21 through the gas delivery channel 221, and the gas in the mixing box 21 cannot return to the gas delivery channel 221.

[0027] Please see Figure 1-8The inlet pipe 12 is a three-way pipe. The end of the inlet pipe 12 closest to the tank 11 has a U-shaped structure. The inlet pipe 12 includes one inlet end and two outlet ends, which are located on both sides of the gas collection groove 223. Ammonia or hydrogen gas in the inlet pipe 12 will be discharged simultaneously from the two outlet ends of the inlet pipe 12 and sprayed onto the two side walls of the groove 222. Subsequently, due to the reduced cross-sectional area of ​​the gas passage, the velocity of ammonia or hydrogen gas will increase, shortening the time for ammonia or hydrogen gas to enter the gas delivery channel 221.

[0028] Each groove 222 is equipped with a filter plate 25, which filters the gas.

[0029] like Figure 11 As shown, this embodiment provides an optimized solution, specifically, a connecting pipe 40 is provided between the nozzle 32 and the mixing box 21. The function of the connecting pipe 40 is to increase the installation space of the second multi-stage shear assembly 41. The second multi-stage shear assembly 41 is a honeycomb structure made of a metal material with relatively high specific heat capacity, specifically rust-resistant aluminum of grade 5052 / 5083 / 5A06. The second multi-stage shear assembly 41 is made of multiple layers of holes with different or gradually varying sizes. The second multi-stage shear assembly 41 not only further breaks up the atmospheric mass through mechanical shearing, but more importantly, its pore size is designed to be smaller than the flame quenching diameter of hydrogen under this condition. Once a flashback tendency occurs, the high specific surface area of ​​the metal mesh can quickly absorb heat, forcing the flame to extinguish.

[0030] In some feasible embodiments, a second multi-stage shearing assembly 41 composed of three layers of alloy mesh is embedded in the connecting pipe 40 between the mixing box 21 and the nozzle 32. The mesh count of each layer of alloy mesh increases from the inside out, with the bottom layer having a mesh count of 40, the middle layer having 80, and the top layer having 120. This gradient pore structure not only forcibly breaks up residual ammonia clusters, but the cooling channels formed by its micropores can also cool the flashback flame below its ignition point, achieving physical isolation.

[0031] Similarly, another set of first multi-stage shearing components 321 can be set inside the nozzle 32. Its structure and principle are similar to those of the second multi-stage shearing component 41, and will not be described in detail here.

[0032] Example 2

[0033] This embodiment proposes a mixing fan blade 232, which, through optimization of its specific structure, forces the hydrogen and ammonia gases to mix rapidly.

[0034] Simply stirring the gas within the mixing box 21 using the mixing fan blade 232 is insufficient to guarantee complete mixing of hydrogen and ammonia. This embodiment further provides an optimized structure for the mixing fan blade 232. The surface of the mixing fan blade 232 is processed with tiny pit structures to form microtextures. When the mixing fan blade 232 rotates with the transmission rod 231, the microtextures disrupt the boundary layer of the fuel fluid, generating tens of thousands of micro-vortices on the surface of the mixing fan blade 232. This forces hydrogen molecules with extremely high diffusion coefficients and ammonia molecules with relatively high inertia to rapidly permeate at the molecular weight level.

[0035] In this embodiment, the mixing fan blade 232 can be made of metal or an alloy. Because the working environment of the mixing fan blade 232 involves significant vibration, which can easily lead to metal fatigue, a material with good fatigue resistance is used for alloy processing, such as high-carbon steel. When processing the recessed structure on the surface of the mixing fan blade 232, since simple machining is insufficient to create tens of thousands of recesses, metal etching technology is used to create the recesses. Since the mixing fan blade 232 is made of high-carbon steel, water washing easily leads to surface oxidation. Therefore, this process uses a non-water washing method to remove surface oxides, whereas mechanical machining would cut away the recessed structure. For example, if the mixing fan blade 232 is made of high-carbon steel, the etchant is a 10%-20% hydrochloric acid solution or sulfuric acid solution. In some feasible embodiments, the etchant is selected from a 10%-20% nitric acid solution.

[0036] like Figure 12 As shown, the process of eroding and forming pits on the surface of the mixing fan blade 232 is as follows: The mixing fan blade 232 is made of metal or alloy material, and a liquid reagent capable of oxidizing the mixing fan blade 232 is selected as the etchant. The mixing fan blade 232 is etched before it is processed to the transmission rod 231.

[0037] Adjust the air-mixing fan blade 232 and atomize and spray the etchant onto its two main extended surfaces. Maintain the etchant droplets at the micrometer level (e.g., 50-150 micrometers, such as 60, 70, 80, 100, 120, or 140 micrometers), spraying a small amount of etchant to avoid large-scale accumulation. After stopping the spraying of the atomized etchant, allow sufficient time (e.g., 30-60 minutes, such as 35, 40, 45, or 50 minutes) to allow the metal or alloy material used to make the air-mixing fan blade 232 to fully react with the etchant, forming oxides through the chemical reaction.

[0038] After heating the air-mixing fan blade 232 to a predetermined temperature (e.g., 400℃-500℃, such as 420℃, 430℃, 440℃, 450℃, 460℃, 470℃, 480℃, 490℃, etc.), the heated air-mixing fan blade 232 is struck. Utilizing the difference in thermal expansion coefficients between the air-mixing fan blade 232 material and the oxide, stress concentration occurs between the air-mixing fan blade 232 material and the oxide, causing the oxide to detach in a large area due to vibration during the striking process.

[0039] After being struck, the mixing fan blade 232 is further heated to 950℃-1100℃ (e.g., 1000℃, 1050℃, etc.) for quenching (oil quenching is selected for the material of the mixing fan blade 232). This quenching process drastically lowers the temperature of the mixing fan blade 232, further promoting oxide shedding. Because the mixing fan blade 232 is brittle after quenching and may experience internal stress concentration, strong impacts on the mixing fan blade 232 are avoided to prevent it from being scrapped. Further post-processing of the mixing fan blade 232 is performed using ultrasonic waves, such as high-frequency micro-vibration (e.g., 10~100μm) to impact the mixing fan blade 232, forcing the oxide to detach over a large area after vibration.

[0040] Then, manually check whether the depth and density of the pits formed on the surface of the mixing fan blade 232 meet the expectations. If the depth and density of the pits formed on the surface of the mixing fan blade 232 do not meet the expectations, repeat the above process of eroding the surface of the mixing fan blade 232 to form pits 1-2 times.

[0041] When repeating the process of eroding and forming pits on the surface of the mixing fan blade 232, the atomized eroding agent may superimpose erosion at the original pit location, resulting in some micro-pits formed by the first erosion and deeper pits formed by secondary erosion at the micro-pits formed by the first erosion. Due to the differences in the size of the pits and the varying degrees of micro-scale eddies, the rotational shear force of the flow continuously folds and stretches the gas-gas interface, causing the contact area to increase exponentially and significantly shortening the diffusion distance. At the same time, the micro-eddies cause the fluid to undergo three-dimensional twisting, folding, and cutting, forming a chaotic flow field that forces hydrogen and ammonia to rapidly interpenetrate, allowing hydrogen molecules to physically mix with ammonia molecules within microseconds before entering the nozzle.

[0042] The process of forming pits on the surface of the mixing fan blade 232 is preferably carried out in a protective gas environment to avoid excessive and uncontrolled oxidation of the surface of the mixing fan blade 232.

[0043] After the above-mentioned process of eroding the surface of the mixing fan blade 232 to form pits is completed, the depth of the pits formed on the surface of the mixing fan blade 232 is 20 micrometers to 40 micrometers, preferably 25 micrometers, 30 micrometers or 35 micrometers.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hydrogen-ammonia dual-fuel burner, characterized in that, include: A gas delivery assembly, the gas delivery assembly including a tank body, with an air inlet pipe on each side of the tank body; A gas mixing assembly is disposed inside the tank body. The gas mixing assembly includes a gas mixing box, which divides the interior of the tank body into a first chamber and a second chamber. Two air inlet pipes are respectively connected to the first chamber and the second chamber. The top and bottom surfaces of the gas mixing box are provided with air inlets. A combustion assembly is disposed on the outside of the tank body. The combustion assembly includes a cover, and a nozzle is provided between the cover and the mixing box. The mixing component includes a stirring element and a plurality of mixing fan blades. The mixing fan blades are made of metal or alloy. The surface of the mixing fan blades is densely covered with micron-sized pits formed by erosion. The depth of the micron-sized pits is 20-40 microns and they are randomly distributed to generate microscale eddies when the fuel flows.

2. The hydrogen-ammonia dual-fuel burner according to claim 1, characterized in that, The gas mixing assembly also includes: Two drive blocks are respectively located in the first chamber and the second chamber, and their structures are mirror-symmetrical. Each drive block has an internal air supply channel. The agitator is located inside the gas mixing box and is rotatably connected to the gas mixing box. Both ends of the agitator are respectively connected to the two drive blocks.

3. The hydrogen-ammonia dual-fuel burner according to claim 2, characterized in that, The end faces of the two drive blocks that are close to each other are in contact with the outer surface of the mixing box and can slide along the outer surface of the mixing box. The two ends of the air delivery channel pass through the side wall and bottom surface of the drive block respectively, and the drive block can completely cover the air inlet.

4. The hydrogen-ammonia dual-fuel burner according to claim 2, characterized in that, The drive block is hemispherical, and its outer surface is provided with a plurality of radially distributed grooves. There are a plurality of air supply channels, each corresponding to a plurality of grooves. The air supply channels are connected to the grooves. There are a plurality of air inlets, which are evenly distributed in a ring.

5. The hydrogen-ammonia dual-fuel burner according to claim 4, characterized in that, The groove has a gas collection slot in the middle, the gas delivery channel is connected to the gas collection slot, and a one-way valve is provided at the end of the gas delivery channel near the air inlet.

6. The hydrogen-ammonia dual-fuel burner according to claim 5, characterized in that, The air inlet pipe is a three-way pipe, and the end of the air inlet pipe near the tank has a U-shaped structure. The air inlet pipe includes one air inlet end and two air outlet ends, and the two air outlet ends of the air inlet pipe are located on both sides of the air collection groove.

7. The hydrogen-ammonia dual-fuel burner according to claim 2, characterized in that, The stirring component includes: A transmission rod, the two ends of which pass through the top and bottom surfaces of the mixing box respectively, and are fixedly connected to the two drive blocks respectively; There are multiple air mixing fan blades, which are radially fixed in the middle of the transmission rod.

8. The hydrogen-ammonia dual-fuel burner according to claim 1, characterized in that, The gas mixing assembly and the combustion assembly are connected by a connecting pipe, which contains a multi-stage shearing assembly.

9. A mixing fan blade, characterized in that: The mixing fan blades are made of metal or alloy. The surface of the mixing fan blades is densely covered with micron-sized pits formed by erosion. The depth of the micron-sized pits is 20-40 microns and they are randomly distributed to generate microscale eddies when the fuel flows.

10. A process for processing air-mixing fan blades, used to process the air-mixing fan blades as described in claim 9, characterized in that: The mixing fan blades are made of metal or alloy materials, and a liquid reagent capable of oxidizing the mixing fan blades is selected as the eroding agent. The air-mixing fan blade is suspended, and an etchant is sprayed onto the two main extended surfaces of the air-mixing fan blade in atomized form. The etchant droplets are kept at the micron level, and a small amount of etchant is sprayed in atomized form to avoid large-scale accumulation of etchant droplets. After stopping the spraying of the etchant, a predetermined time is maintained to allow the metal or alloy material used to make the air-mixing fan blade to fully react with the etchant, and the etchant reacts chemically with the air-mixing fan blade to form oxides. After heating the air-mixing fan blades to the first predetermined temperature, the heated air-mixing fan blades are struck. Due to the difference in the coefficient of thermal expansion between the air-mixing fan blade material and the oxide, stress concentration is formed between the air-mixing fan blade material and the oxide. During the striking process, the oxide is vibrated and falls off in a large area. After being struck, the mixing fan blades are heated to a second predetermined temperature and then quenched. The quenching process drastically reduces the temperature of the mixing fan blades, further promoting the shedding of oxides.

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