A pure hydrogen fuel injection and mixing structure based on micro-mixing array distributed control

Abstract

A pure hydrogen fuel injection and blending structure based on distributed control of a micro-mix array relates to aircraft engines and gas turbines. A micro-mix injection and blending array is formed by a plurality of micro-mix array units arranged in a certain manner. Each array unit injection and blending structure includes an air channel and one or two hydrogen injection holes perpendicular to the direction of air flow. The fuel injection pipeline and the nozzle area are integrated into a multi-stage fuel supply system for distributed supply to the micro-mix array units, so that the micro-mix array units can work individually for injection and combustion or in groups. During startup, the central unit is ignited first and regarded as the duty flame, reducing the difficulty of ignition. The number of operating micro-mix array units is reduced without affecting the combustion of other micro-mix array units. Operation can also be maintained at an extremely low power state, and backfire is prevented at low power, thereby widening the overall power envelope of the combustion chamber. This solves the problems of instability, backfire, and NOx emissions during hydrogen combustion.

Description

Technical Field

[0001] The present invention relates to the fields of aircraft engines and gas turbines, and in particular to a pure hydrogen fuel injection and blending structure based on micro-mixing array distributed control, aiming to achieve more efficient and stable fuel injection and blending. Background Art

[0002] Against the backdrop of the "dual carbon" goals, research into the application of hydrogen fuel technology in civil aviation has garnered international attention. Compared to traditional jet fuel and natural gas, hydrogen fuel offers advantages such as a wide flammability range, a high ignition point, a fast combustion rate, a high calorific value, high energy efficiency, and near-zero carbon emissions. Therefore, hydrogen-fueled aviation engines hold significant market potential in the future of aviation transportation.

[0003] Hydrogen-fueled aviation engines are gas turbine engines that use hydrogen as an energy source to output shaft power or generate thrust. Compared to traditional fuels like aviation kerosene, hydrogen combustion has a faster flame propagation speed, a shorter flame distance, a shorter ignition delay, and a wider flammability range. This can lead to unstable hydrogen combustion, susceptibility to flashback, and other potential hazards. Higher adiabatic flame temperatures and uneven combustion result in higher nitrogen oxide emissions.

[0004] In response to the above problems, the present invention proposes a pure hydrogen fuel injection and mixing structure using a micro-mixing array distributed control to achieve high-speed injection and mixing of hydrogen on a small scale, aiming to avoid backfire and achieve more efficient and stable combustion and nitrogen oxide control to adapt to the characteristics of hydrogen fuel combustion, and to be used to transform existing combustion chambers to meet the needs of efficient and reliable combustion organization and low nitrogen oxide emissions. It is the key to ultimately achieving high-performance combustion in hydrogen turbine combustors. Summary of the Invention

[0005] The purpose of the present invention is to provide a pure hydrogen fuel injection and mixing structure based on micro-mixing array distributed control that can avoid backfire, organize stable combustion, and reduce nitrogen oxide emissions. It can organize the combustion of pure hydrogen more efficiently and solve the problems of instability, backfire and NOx emissions during hydrogen combustion. The core components of the present invention include a micro-mixing array unit injection and mixing structure and a pure hydrogen fuel supply system. Among them, the micro-mixing array unit injection and mixing structure cleverly integrates the air channel and the fuel injection structure to achieve precise mixing of fuel and air; the pure hydrogen fuel supply system focuses on the distributed supply control of the fuel to ensure stable and efficient delivery of the fuel. Through this system, the present invention realizes the micro-mixing injection of pure hydrogen fuel, improves fuel utilization efficiency, and provides strong support for the development of the field of aviation engines and gas turbines.

[0006] To achieve the above purpose, the technical solution of the present invention is as follows:

[0007] A pure hydrogen fuel injection and mixing structure based on micro-mixing array distributed control includes a micro-mixing plate, on which a micro-mixing array unit injection and mixing structure and a pure hydrogen fuel supply system are provided;

[0008] The micro-mixing array unit injection and mixing structure is composed of a plurality of micro-mixing units, and the plurality of micro-mixing units are arranged in a certain manner to form a micro-mixing injection and mixing array structure;

[0009] Each micro-hybrid unit includes an air channel and 1 to 2 hydrogen injection holes perpendicular to the air flow direction; the cross-sectional shape of the air channel is circular, elliptical, diamond or hexagonal to meet the needs of different working environments; the cross-sectional area of ​​the air channel is 10 to 70 mm 2 , length is 10 to 20 mm, and the smaller air circulation area is used to ensure that the air velocity is maintained within a certain range; the hydrogen injection hole is located at the downstream outlet of the air channel, and the hydrogen injection holes are evenly arranged perpendicular to the direction of the air channel; in order to ensure the effective injection penetration depth of the fuel and achieve rapid and sufficient mixing of the fuel and air, the diameter of the hydrogen fuel injection hole is 0.3 to 0.9 mm to ensure the fuel injection speed and avoid backfire.

[0010] The pure hydrogen fuel supply system is composed of a multi-stage fuel supply pipeline, including at least a primary air supply pipeline and a secondary air supply pipeline. The pure hydrogen fuel supply system is designed to achieve precise regional supply of hydrogen fuel; one end of the secondary air supply pipeline is connected to the hydrogen fuel injection hole, and the other end of the secondary air supply pipeline is connected to the primary air supply pipeline; the secondary air supply pipeline is used to directly supply a single micro-mixing array unit; multiple micro-mixing array units form a synchronous air supply area, and the secondary air supply pipelines are further combined into a primary air supply pipeline; the primary air supply pipeline and the secondary air supply pipeline are both embedded in the micro-mixing board; by designing multiple different primary air supply pipelines, the air intake of each area is controlled separately, thereby achieving precise distribution of hydrogen fuel in different areas.

[0011] Furthermore, multiple micro-mixing units can be arranged in a multi-layered circular array to form a micro-mixing injection and mixing array, which can simultaneously achieve high-speed injection of hydrogen fuel and uniform mixing with air, thereby preventing flashback, ensuring stable combustion, and reducing nitrogen oxide emissions. The number of micro-mixing units can be set as needed.

[0012] Furthermore, the hydrogen fuel injection hole may be provided at a distance of 2 to 3 mm from the downstream outlet of the air channel.

[0013] Furthermore, the multi-stage fuel supply pipeline can be designed as an integral part with the air channel and the fuel injection hole to simplify the complexity of parts processing, and the cooling function of the supply pipeline can be used to provide effective heat dissipation support for the micro-mix injection mixing array structure.

[0014] Furthermore, the cross-section of the multi-stage fuel supply pipeline is elliptical. The elliptical fuel supply pipeline design not only enhances the stability of the structure, but also utilizes the incoming hydrogen to cool the entire micro-mix injection and mixing structure. At the same time, the elliptical pipeline design increases the cross-sectional area ratio to the hydrogen injection hole, which helps to ensure the injection uniformity of multiple micro-mix array units.

[0015] Furthermore, the pure hydrogen fuel supply system adopts a distributed supply strategy. When the combustion chamber is started, air can be injected into the micro-mixing unit located in the center first, and then ignition is completed to form a small flame on duty, which can provide ignition and other functions for the subsequent micro-mixing units to start combustion; by controlling the hydrogen supply amount of different micro-mixing array units, it is determined which micro-mixing array units will burn and which units remain silent; hydrogen fuel is supplied to each micro-mixing array unit separately and evenly to achieve separate gas supply operation of different micro-mixing array units to meet different combustion power requirements; ensure that each unit can obtain sufficient fuel supply, and realize precise control of fuel supply, thereby improving the operating efficiency and stability of the overall system.

[0016] A staged fuel supply system offers significant advantages. During low-power operation, by reducing the number of active mild-hybrid units rather than significantly reducing fuel injection, the system effectively reduces combustion power while preventing flashback. This feature significantly broadens the overall power envelope of the combustion chamber, adapting it to a wider range of operating conditions. A staged fuel supply system also reduces the risk of ignition startup by initially supplying fuel to a single zone for ignition and then gradually adjusting the fuel supply strategy.

[0017] The present invention has the following beneficial effects:

[0018] 1. To achieve distributed hydrogen fuel supply control, the pure hydrogen fuel supply system consists of multi-stage fuel supply pipelines, providing fuel to the micro-hybrid array units in different regions. This allows for separate gas supply operation for different micro-hybrid array units, meeting different combustion power requirements, resolving issues such as unstable hydrogen combustion and prone to flashback at low equivalence ratios, enabling the combustion chamber to operate at extremely low power, broadening its operating range, and allowing some micro-hybrid array units to operate independently.

[0019] 2. The integrated multi-stage hydrogen supply ring pipe of this invention not only ensures smooth hydrogen flow and uniform injection from the micro-mixing injection holes, but also provides cooling for the micro-mixing injection structure. Its geometrically compact structure effectively shortens the combustion chamber length and reduces engine weight. It also allows for easy portability, and multiple micro-mixing injection arrays can be combined to form a larger injection and mixing structure to meet higher operating requirements.

[0020] 3. The present invention adopts a distributed control fuel injection system, which can control the injection, mixing and combustion of fuels of different micro-mixing array units to form a small flame on duty, which can provide ignition and other functions for the subsequent micro-mixing units to start combustion.

[0021] 4. This invention achieves high-speed hydrogen injection and mixing at a small scale, aiming to avoid flashback and achieve more efficient and stable combustion and nitrogen oxide control, adapting to the characteristics of hydrogen fuel combustion. The air channels in the micro-mixing array unit rectify and accelerate incoming air, effectively preventing flashback. The fuel injection hole size of less than 1mm effectively increases the hydrogen injection velocity to accommodate the rapid incoming air flow, achieving greater penetration depth and better mixing.

[0022] 5. The present invention can effectively organize the high-speed injection and mixing structure of pure hydrogen fuel, effectively solving the problems of hydrogen combustion backfire and high NOx emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 Schematic cross-sectional view of the pure hydrogen fuel injection and mixing structure of the present invention along the AA direction;

[0025] Figure 3 Schematic cross-sectional view of the pure hydrogen fuel injection and mixing structure of the present invention along the BB direction;

[0026] Figure 4 It is a partial enlarged view of the D area of ​​the cross-sectional view BB of the pure hydrogen fuel injection and mixing structure of the present invention;

[0027] Figure 5 It is a partial enlarged view of the C area of ​​the AA cross-sectional view of the pure hydrogen fuel injection and mixing structure of the present invention.

[0028] Figure 6 This is a reference diagram of the usage status of the present invention.

[0029] The marks in the figure are: 01, micro-hybrid array unit; 02, hydrogen injection hole; 03, secondary fuel supply pipeline; 04, primary fuel supply pipeline; 04-1, primary fuel supply pipeline I; 04-2, primary fuel supply pipeline II; 04-3, primary fuel supply pipeline III. DETAILED DESCRIPTION

[0030] To more clearly illustrate the purpose, technical solutions, and effects of the present invention, the following will further illustrate the present invention with reference to the accompanying drawings and examples. It should be noted that the specific implementations described herein are intended only to illustrate the present invention and are not intended to limit the present invention. Existing technologies may be used for parts not described in detail.

[0031] like Figure 1 As shown, an embodiment of the pure hydrogen fuel injection and mixing structure based on distributed control of a micro-mixing array is provided. The structure is composed of multiple micro-mixing array units, which are closely arranged in a specific arrangement. This embodiment uses a three-layer circular array composed of multiple micro-mixing array units to optimize the mixing efficiency of hydrogen and air. Specifically, a three-layer circular array arrangement is adopted, with different numbers of micro-mixing array units distributed in sequence from the inner layer to the outer layer. The inner layer contains one micro-mixing array unit, the middle layer contains six micro-mixing array units arranged in a circular pattern, and the outer layer contains 12 micro-mixing array units arranged in a circular pattern. Each micro-mixing array unit maintains the same size.

[0032] Each micro-mixing array unit 01 has a characteristic diameter d1, and the range of the diameter d1 is set to 3 to 9 mm to ensure effective coordination between the units and the stability of the overall structure. Unit spacing: The spacing between the micro-mixing array units has been carefully calculated and determined to be 1.5 to 2.5 times the characteristic diameter d1 to optimize the gas flow and mixing effect. Thickness control: The thickness of the entire injection mixing structure is controlled at 10 to 20 mm to achieve a compact and efficient design. Internal channel design: Each micro-mixing array unit 01 contains an air channel and two hydrogen injection holes 02 that are perpendicular to the air channel. This layout ensures sufficient mixing of air and hydrogen. As Figure 4 and 5 As shown, mark 02 represents the hydrogen injection hole, and Figure 5 The Air mark in the figure indicates the position of the air channel, and the direction of H2 inflow clearly shows the injection direction of hydrogen through the hydrogen injection hole 02.

[0033] The diameter of the micro-mixing plate is 50 to 60 mm, and the thickness is consistent with the length of the air channel of the micro-mixing unit, which is 10 to 20 mm. The distribution of the micro-mixing unit ensures the uniformity of the incoming air and ensures that the incoming air flows evenly through the air channel of each micro-mixing unit. Since the fuel injection is in the lateral vertical direction, the fuel injection pipeline needs to be embedded inside the combustion hole plate, and the air supply is distributed separately, which makes it difficult to ensure the uniformity of the fuel intake injection. The present invention utilizes the slender characteristics of the fuel injection hole and designs a larger (much larger than the injection hole) intake confluence main pipeline upstream of the air intake, so that the fuel can fill the entire pipeline as soon as possible and be ejected through the injection hole, so as to achieve uniform fuel injection of all injection holes.

[0034] The cross-sectional detailed structure of micro-hybrid array unit 01 is as follows Figure 5As shown in the figure, air enters through a specific air channel, and hydrogen is ejected through the hydrogen injection holes 02. The hydrogen and air streams mix within the micro-mixing array unit and flow downstream, forming a stable vortex combustion zone, thereby achieving efficient combustion. The area 1 to 15 mm behind the micro-mixing plate forms the combustion chamber, where the fuel and oxidizer mix evenly and burn fully. To increase injection velocity and penetration depth, the hydrogen injection holes 02 are sized from 0.3 to 0.9 mm. This design ensures that hydrogen is injected at an appropriate velocity and pressure for thorough mixing with the air. The distance between the hydrogen injection holes and the downstream outlet of the air channel is also carefully calculated. Excessive distances prevent the mixture from flowing into the vortex zone, hindering ignition and combustion; while too small distances hinder uniform mixing of hydrogen and air. Therefore, the distance between the hydrogen injection holes and the downstream outlet of the air channel is controlled within a range of 1.5 to 3 mm to ensure mixture stability and combustion efficiency. The gas mixing process is optimized by controlling geometric parameters. In actual applications, adjustments are made due to different operating conditions (such as pressure, temperature, flow, etc.) to adapt to specific application scenarios and performance requirements.

[0035] The present invention adopts a multi-layer coaxial circumferential array distribution of micro-mixing array units 01 and is equipped with corresponding hydrogen fuel supply pipelines. Figure 2 and 3 As shown, the first-level fuel supply pipeline 04 adopts a three-layer hydrogen fuel supply pipeline design. The three layers of hydrogen fuel supply pipelines correspond to the micro-hybrid array units 01 of each layer of the three circumferential arrays. Each layer of fuel supply pipelines serves the micro-hybrid array units of each layer, which helps each unit to obtain accurate fuel supply, ensuring the accuracy and efficiency of fuel supply. Figure 3 In the diagram, the first-level fuel supply pipeline I04-1 is responsible for supplying hydrogen fuel to the micro-hybrid array unit 01 in the center layer, the first-level fuel supply pipeline II4-2 is responsible for supplying fuel to the units in the middle layer, and the first-level fuel supply pipeline III04-3 is responsible for supplying fuel to the outermost unit. This design ensures that each micro-hybrid array unit 01 can obtain sufficient hydrogen fuel, thereby achieving precise fuel control. In addition, Figure 2 and 5 As shown, the primary fuel supply pipeline 04 adopts an elliptical design, tightly coupled to the entire micro-mix injection structure. This elliptical fuel supply pipeline design not only enhances structural stability but also utilizes the incoming hydrogen to cool the entire micro-mix injection mixing structure. The elliptical pipeline design increases the cross-sectional area ratio to the hydrogen injection holes 02, helping to ensure injection uniformity across the multiple micro-mix array units 01. By zoning multiple primary fuel supply pipelines 04, fuel supply regulation can be further refined, enabling precise fuel supply regulation and ultimately achieving precise combustion control.

[0036] The fuel supply pipeline is embedded within the micro-mixing plate and is integrally molded. It comprises multiple branches, providing distributed supply to the micro-mixing units, enabling combustion by individual micro-mixing units or in groups. This reduces combustion power while maintaining very low power by reducing the number of micro-mixing units in operation, rather than significantly reducing fuel injection. This prevents flashback at low power levels, thereby broadening the combustion chamber's overall power envelope. Furthermore, the fuel supply pipeline is embedded within the combustion orifice plate, effectively cooling the plate.

[0037] The present invention realizes efficient and accurate hydrogen supply to each micro-hybrid array unit through a multi-stage hydrogen fuel supply control system. Figure 3 and 4 As shown, the primary fuel supply pipeline 104-1 serves as the primary fuel delivery channel, responsible for introducing hydrogen from the source to the center of the system. The secondary fuel supply pipeline 03 serves as a distributor, drawing from the primary fuel supply pipeline 04 and distributing the hydrogen fuel to the hydrogen injection holes 02 of each micro-hybrid array unit 01.

[0038] In such Figure 4 In the partially enlarged view, it can be clearly seen that each secondary fuel supply pipeline 03 is connected upstream to a primary fuel supply pipeline 04, forming a continuous fuel supply network. Each secondary fuel supply pipeline 03 is responsible for supplying hydrogen to one injection hole of two micro-mixing array units. Through this one-to-one supply method, it is ensured that each injection hole receives sufficient and stable hydrogen flow, achieving uniform and stable injection. Multiple secondary fuel supply pipelines 03 cooperate with each other to form a complete multi-stage hydrogen fuel supply control system for the micro-mixing array unit injection hole 02 → secondary fuel supply pipeline 03 → primary fuel supply pipeline 04. This system not only improves fuel delivery efficiency, but also achieves fine-tuning of the combustion process by precisely controlling the fuel supply amount to each injection hole.

[0039] like Figure 6 A reference to a usage status example is given. During the implementation process, air first flows into the combustion chamber intake channel 100. After passing through the micro-mixing plate, the air will be evenly divided into 19 beams by 19 air channels, pass through the micro-mixing plate 200, and here it is mixed with the hydrogen injected into the air channel through the hydrogen injection hole, and then distributedly burned in the combustion chamber 300 behind the micro-mixing plate. The air inlet remains unchanged and is supplied globally. The combustion of different micro-mixing units can be determined by adding or subtracting hydrogen injection channels, thereby forming distributed combustion of different micro-mixing units to achieve different power output requirements. The combustion chamber 300 can be designed according to actual conditions and is not limited to the cylindrical structure of this embodiment. This also helps the micro-mixing combustion chamber to be applied to more scenarios.

[0040] The present invention achieves distributed combustion to meet varying power output requirements by precisely controlling the hydrogen supply to different micro-mixing array units. In practice, the structure is cleverly installed within the combustion chamber of an aircraft engine or gas turbine, fully utilizing the characteristics of the incoming compressed air. Specifically, as the incoming compressed air flows through the micro-mixing array units, it is divided into multiple streams and accelerated through the units' air channels. Hydrogen is injected perpendicularly to the incoming air flow through hydrogen injection holes 02, rapidly mixing with the air. The meticulously designed micro-mixing array units and injection hole structure ensures thorough mixing of hydrogen and air, creating favorable conditions for the subsequent combustion process. More importantly, by controlling the hydrogen supply to different micro-mixing array units, the present invention flexibly determines which micro-mixing array units are activated and which remain inactive. This distributed combustion method not only improves combustion efficiency but also makes the combustion process more stable and controllable. By adjusting the combustion state of different micro-mixing units, the output power can be precisely adjusted to meet the requirements of different operating conditions.

[0041] The present invention demonstrates a high degree of flexibility and controllability during startup, operation, and shutdown. During startup, air is first introduced, with the incoming compressed air flowing through the micro-mix array units. Hydrogen is then supplied only to the micro-mix array units in the center layer for injection and ignition. This design cleverly utilizes the center layer's advantageous location to form a stable on-duty flame, which not only simplifies the ignition process, reducing ignition difficulty and cost, but also provides a reliable ignition source for subsequent operation of the entire combustion chamber. As operational requirements change, the fuel supply to the various micro-mix array units can be flexibly adjusted. Hydrogen can be introduced from the periphery as needed, allowing the peripheral micro-mix array units to ignite with the central flame, thereby achieving full power operation for the entire combustion chamber. Since the central layer's on-duty flame is already burning stably, the surrounding micro-mix array units are ignited by the central flame, achieving full power operation for the entire combustion chamber. This distributed combustion method not only improves combustion efficiency but also makes the combustion process more uniform and stable. The present invention also demonstrates excellent controllability during shutdown. The hydrogen supply can be gradually cut off from the periphery, starting with the peripheral hydrogen supply and then working inwards. Finally, a decision is made based on the specific situation whether to extinguish the central mild-mix unit or retain the flame for duty. This flameout method ensures the safety and stability of the combustion chamber and avoids damage to the equipment caused by thermal and mechanical stresses caused by sudden flameout.

[0042] The present invention discloses a new type of pure hydrogen micro-mix array injection structure based on distributed control, which is different from the traditional kerosene combustion method. It is used to organize more efficient pure hydrogen combustion and solve the problems of hydrogen combustion instability, flashback and NOx emissions. The structure is composed of multiple micro-mix array units arranged in a certain manner to form a micro-mix injection and mixing array, wherein each array unit injection and mixing structure includes an air channel and 1-2 hydrogen injection holes perpendicular to the air flow direction. The fuel injection pipeline and the nozzle area are integrated into a multi-stage fuel supply system for distributed supply to the micro-mix array units, so that the micro-mix array units can work individually for injection and combustion or multiple units can work in groups. At startup, the central unit can be ignited first and regarded as the duty flame, reducing the difficulty of ignition; reducing the number of operating micro-mix array units without affecting the combustion of other micro-mix array units, and can also maintain operation at an extremely low power state, and ensure that there is no backfire at low power, thereby widening the overall power envelope of the combustion chamber. In addition, the fuel supply pipeline and the nozzle are integrated into one design, so the fuel can take away some of the heat from the injection structure, thus playing a certain role in thermal protection.

[0043] The above embodiments describe in detail the pure hydrogen fuel injection and blending structure of the present invention and its application in aircraft engines or gas turbines. However, this does not mean that the present invention is limited to these specific details. Practitioners in the technical field can adjust, optimize and expand the structure, components and operating methods according to actual needs. For example, the design of the micro-mixing array unit and the hydrogen injection hole, as well as the control method of the fuel supply pipeline can be improved according to engineering needs. At the same time, the present invention is not only applicable to aircraft engines and gas turbines, but may also be applied to other occasions that require efficient and stable hydrogen combustion. Therefore, the scope of protection of the present invention is broad, including all changes, modifications and derivatives made without departing from its principles and spirit.

Claims

1. A pure hydrogen fuel injection and mixing structure based on micro-mixing array distributed control, characterized in that It includes a micro-mixing plate, on which a micro-mixing array unit injection and mixing structure and a pure hydrogen fuel supply system are provided; The micro-mixing array unit injection and mixing structure is composed of a plurality of micro-mixing units, and the plurality of micro-mixing units are arranged in a certain manner to form a micro-mixing injection and mixing array structure; Each micro-hybrid unit includes an air channel and at least one hydrogen injection hole perpendicular to the air flow direction; the cross-sectional shape of the air channel is circular, elliptical, diamond or hexagonal to meet the needs of different working environments; the cross-sectional area of ​​the air channel is 10 to 70 mm 2 The length is 10 to 20 mm, and the smaller air flow area is used to ensure that the air velocity remains within a certain range; the hydrogen injection holes are located at the downstream outlet of the air channel, and the hydrogen injection holes are evenly arranged perpendicular to the direction of the air channel; in order to ensure the effective injection penetration depth of the fuel and achieve rapid and sufficient mixing of the fuel and air, the diameter of the hydrogen fuel injection hole is 0.3 to 0.9 mm to ensure the fuel injection speed and avoid backfire; The pure hydrogen fuel supply system is used to control the mixing and combustion of fuel injected by different micro-mixing units. The pure hydrogen fuel supply system is composed of a multi-stage fuel supply pipeline, including at least a primary air supply pipeline and a secondary air supply pipeline. The pure hydrogen fuel supply system is designed to achieve precise regional supply of hydrogen fuel; one end of the secondary air supply pipeline is connected to the hydrogen fuel injection hole, and the other end of the secondary air supply pipeline is connected to the primary air supply pipeline; the secondary air supply pipeline is used to directly supply a single micro-mixing array unit; Multiple micro-mixing array units form a synchronous air supply area, and the secondary air supply pipelines are further combined into a primary air supply pipeline; both the primary and secondary air supply pipelines are embedded in the micro-mixing board; by designing multiple different primary air supply pipelines, the air intake of each area is controlled separately, thereby achieving precise distribution of hydrogen fuel in different areas.

2. A pure hydrogen fuel injection and mixing structure based on micro-mixing array distributed control as claimed in claim 1, characterized in that Multiple micro-mixing array units can be arranged in a multi-layer circular array to form a micro-mixing injection and mixing array, thereby achieving high-speed injection of hydrogen fuel and uniform mixing with air.

3. A pure hydrogen fuel injection and mixing structure based on micro-mixing array distributed control as claimed in claim 1, characterized in that The hydrogen fuel injection hole is arranged 2 to 3 mm away from the downstream outlet of the air channel.

4. A pure hydrogen fuel injection and mixing structure based on micro-mixing array distributed control as claimed in claim 1, characterized in that Each micro-mixing unit includes 1 to 2 hydrogen injection holes perpendicular to the air flow direction.

5. A pure hydrogen fuel injection and mixing structure based on micro-mixing array distributed control as claimed in claim 1, characterized in that The multi-stage fuel supply pipeline is designed as an integral part of the air channel and the fuel injection hole to simplify the complexity of parts processing. The cooling function of the supply pipeline is used to provide heat dissipation support for the micro-mix injection mixing array structure.

6. A pure hydrogen fuel injection and mixing structure based on micro-mixing array distributed control as claimed in claim 1, characterized in that The cross-section of the multi-stage fuel supply pipeline is elliptical. The elliptical fuel supply pipeline design not only enhances the stability of the structure, but also uses the incoming hydrogen to cool the entire micro-mix injection and mixing structure. At the same time, the elliptical pipeline design increases the cross-sectional area ratio to the hydrogen injection hole, which helps to ensure the injection uniformity of multiple micro-mix array units.

7. A pure hydrogen fuel injection and mixing structure based on micro-mixing array distributed control as claimed in claim 1, characterized in that The pure hydrogen fuel supply system adopts a distributed supply strategy. When the combustion chamber is started, air is first injected into the micro-mixing unit located in the center, and then ignition is completed to form a small flame on duty, providing ignition function for subsequent micro-mixing units to start combustion; by controlling the hydrogen supply amount of different micro-mixing array units, it is determined which micro-mixing array units will burn and which units will remain silent; hydrogen fuel is supplied to each micro-mixing array unit separately and evenly, so that different micro-mixing array units can be supplied with gas separately to meet different combustion power requirements.

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