Dual-mode hydrogen low-pollution combustion chamber

Abstract

The utility model discloses a dual-mode hydrogen low-pollution combustion chamber. The dual-mode hydrogen low-pollution combustion chamber comprises a combustion chamber shell, a combustion chamber head and a hydrogen supply pipeline. The on-duty level micro-diffusion nozzle and the main combustion level micro-premixing nozzle are used for realizing the switching of hydrogen between a micro-diffusion combustion mode and a micro-diffusion-micro-premixing combined combustion mode under different combustion chamber thermal power, so that the combustion stability is improved, the emission of nitrogen oxide is reduced, and the combustion efficiency is improved. And tempering and spontaneous combustion of hydrogen can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen gas turbine combustors, in particular to a dual-mode hydrogen low-pollution combustor. Background Technique

[0002] In view of the increasingly serious global warming problem, low-carbon emissions have become the primary goal of environmental protection in countries around the world. Since hydrogen fuel does not contain carbon elements, when hydrogen is directly burned in a gas turbine engine, the reaction by-products with oxygen are only water and nitrogen oxides. Therefore, hydrogen fuel is one of the most potential fuels for achieving zero carbon emissions. However, hydrogen has a low density, weak jet penetration ability, and is easily swept away by high-speed airflows. Therefore, the injected hydrogen cannot be fully mixed in a large-flow, high-speed inlet airflow. There are phenomena of local fuel concentration and over-richness, resulting in problems of high local equivalence ratio and high-temperature hot spots, and then generating a large amount of nitrogen oxides. However, although a low-pollution large-scale swirl premixed combustor can suppress pollutant emissions, it is prone to flashback and combustion oscillation problems. If the inlet parameters are too high, hydrogen is also prone to spontaneous combustion.

[0003] To solve the above problems, the current mainstream adopts the hydrogen micro-mixing combustion technology route. That is, micro-channel mixing is used to convert a large-scale flame into multiple small-scale flames, enhancing the local mixing intensity of air and hydrogen and improving the mixing uniformity. The small-scale flames formed in this way significantly shorten the residence time of nitrogen in the high-temperature zone, and can greatly reduce the generation of nitrogen oxides. This combustion phenomenon in a mixing channel with a structural size less than 10 mm is called micro-mixing combustion. Common hydrogen combustion organization methods include micro-premixed combustion and micro-diffusion combustion. Micro-premixed combustion means that hydrogen and air are pre-mixed in a micro-channel, and the oxidant is ejected through the same spray hole by co-jet. The nitrogen oxide emissions of micro-premixed combustion are very low, but it is prone to flashback when the combustion exhaust temperature is high, and an anti-flashback device needs to be designed. When the air inlet temperature is high, it is also prone to spontaneous combustion and is more likely to cause unstable combustion phenomena. On the contrary, in micro-diffusion combustion, hydrogen and air pass through the jet channels at high speeds respectively, and hydrogen is injected at the air outlet, and the two are mixed and burned at the micro-channel outlet. Diffusion combustion can fundamentally avoid the problems of hydrogen flashback and spontaneous combustion and improve combustion stability, but diffusion combustion will also be accompanied by higher nitrogen oxide emissions. Therefore, the current hydrogen micro-mixing combustion technology is difficult to take into account the respective advantages of micro-diffusion combustion and micro-premixed combustion and obtain the best hydrogen combustion performance. Content of the Utility Model

[0004] The purpose of the utility model is to design a dual-mode hydrogen low-pollution combustor to solve the above problems.

[0005] The utility model realizes the above purpose through the following technical solutions:

[0006] The utility model provides a dual-mode hydrogen low-pollution combustion chamber, which comprises a combustion section housing, an intake section housing, a combustion chamber head, a hydrogen main pipe and hydrogen branch pipes. The combustion section housing is located at the right end of the intake section housing. The combustion chamber head, the hydrogen main pipe and the hydrogen branch pipes are arranged inside the intake section housing, and the hydrogen branch pipes are evenly distributed along the circumferential direction of the hydrogen main pipe and are connected to the combustion chamber head.

[0007] Preferably, the combustion chamber head includes a head mounting panel, a micro-diffusion nozzle and a micro-premixing nozzle. The micro-diffusion nozzle and the micro-premixing nozzle are mounted on the head mounting panel.

[0008] Preferably, the head mounting panel is provided with a plurality of nozzle mounting holes, and nozzle boss mounting seats are arranged at the edges of the nozzle mounting holes. One nozzle mounting hole is opened at the center position of the head mounting panel, and then two circumferentially evenly arranged circles of nozzle mounting holes are distributed radially. The number of nozzle mounting holes in the inner circle ranges from 3 to 9, and the number of nozzle mounting holes in the outer circle ranges from 6 to 12.

[0009] Preferably, the micro-diffusion nozzle includes a micro-diffusion nozzle hydrogen inlet, a micro-diffusion nozzle hydrogen flow channel, micro-diffusion nozzle hydrogen spray holes, a micro-diffusion nozzle air inlet, a micro-diffusion nozzle air flow channel, micro-diffusion nozzle air spray holes and a micro-diffusion nozzle boss; the micro-diffusion nozzle hydrogen inlet is connected to the hydrogen branch pipe, so that hydrogen enters the micro-diffusion nozzle hydrogen flow channel. The micro-diffusion nozzle hydrogen spray holes are radial through holes evenly distributed along the circumferential direction of the end wall of the micro-diffusion nozzle. The micro-diffusion nozzle air flow channel is evenly distributed along the circumferential direction outside the micro-diffusion nozzle hydrogen flow channel, and is provided with a micro-diffusion nozzle air inlet and micro-diffusion nozzle air spray holes corresponding to the micro-diffusion nozzle hydrogen inlet and the micro-diffusion nozzle hydrogen spray holes. The number of micro-diffusion nozzle hydrogen spray holes corresponds one-to-one to the number of micro-diffusion nozzle air spray holes, and the number ranges from 3 to 6. A circle of micro-diffusion nozzle bosses is arranged on the outer side wall of the micro-diffusion nozzle to realize the axial installation positioning of the micro-diffusion nozzle and is welded to the nozzle boss mounting seat on the head mounting panel. Hydrogen flows into the micro-diffusion nozzle hydrogen flow channel through the micro-diffusion nozzle hydrogen inlet of the micro-diffusion nozzle, and then flows out from the radially micro-diffusion nozzle hydrogen spray holes evenly distributed along the circumferential direction of the end wall of the micro-diffusion nozzle. Air flows into the micro-diffusion nozzle air flow channel from the micro-diffusion nozzle air inlet, and then flows out from the end micro-diffusion nozzle air spray holes. Furthermore, downstream of the micro-diffusion nozzle air spray holes, air and hydrogen are transversely jet-mixed to achieve rapid and efficient mixing within a short distance.

[0010] As a preference of the present utility model, the micro-premixing nozzle includes a check valve assembly, a hydrogen inlet of the micro-premixing nozzle, a hydrogen flow channel of the micro-premixing nozzle, a hydrogen spray hole of the micro-premixing nozzle, an air inlet of the micro-premixing nozzle, an air flow channel of the micro-premixing nozzle, a premixed spray hole, and a boss of the micro-premixing nozzle; the check valve assembly is arranged inside the hydrogen flow channel of the micro-premixing nozzle, the hydrogen inlet of the micro-premixing nozzle is connected to the hydrogen branch pipe, so that hydrogen enters the hydrogen flow channel of the micro-premixing nozzle, the hydrogen spray hole of the micro-premixing nozzle is a radial through hole evenly distributed circumferentially along the end wall surface of the micro-premixing nozzle, the air flow channel of the micro-premixing nozzle is evenly distributed circumferentially outside the hydrogen flow channel of the micro-premixing nozzle, and is provided with an air inlet of the micro-premixing nozzle corresponding to the hydrogen inlet of the micro-premixing nozzle, the number of the hydrogen spray holes of the micro-premixing nozzle corresponds one by one to the number of the air inlets of the micro-premixing nozzle, and the number range is 3-6; a circle of bosses of the micro-premixing nozzle is arranged along the outer wall surface of the micro-premixing nozzle, and is welded and connected to the nozzle boss mounting seat on the head mounting panel to realize the axial mounting and positioning of the micro-premixing nozzle.

[0011] As a preference of the present utility model, the check valve assembly includes a valve core, a valve core opening, a support spring, and a spring base; the support spring is installed on the spring base, the valve core is sleeved on the support spring, and the valve core opening is arranged at the end of the valve core.

[0012] As a preference of the present utility model, a premixed hydrogen branch pipe and a diffused hydrogen branch pipe are axially arranged on the hydrogen main pipe respectively. The premixed hydrogen branch pipe is connected to the hydrogen inlet of the micro-premixing nozzle by welding, and the diffused hydrogen branch pipe is also connected to the hydrogen inlet of the micro-diffusion nozzle by welding.

[0013] The beneficial effects of the present utility model are as follows:

[0014] 1. At low heat power of the combustion chamber, it is in a micro-diffusion combustion mode, the inlet air flow rate is small, and only the duty-class micro-diffusion nozzle is opened. The micro-diffusion combustion method is used to improve the combustion stability, fundamentally avoid the risks of hydrogen backfire and spontaneous combustion, and can also effectively reduce the nitrogen oxide emissions.

[0015] 2. At high heat power of the combustion chamber, it is in a micro-diffusion - micro-premixing combined combustion mode. At this time, due to the large inlet air flow rate, the duty-class micro-diffusion nozzle and the main combustion stage micro-premixing nozzle are opened simultaneously. The main combustion stage hydrogen nozzle adopts the micro-premixing combustion method, which can greatly reduce the nitrogen oxide emissions. At the same time, the duty-class micro-diffusion nozzle is used as an ignition source to improve the combustion stability of the main combustion stage hydrogen. At the same time, under the condition of a large flow air inlet, the nozzle outlet flow rate is high, which can effectively inhibit the backfire problem of the main combustion stage hydrogen premixing nozzle. Brief Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the dual-mode hydrogen low-pollution combustion chamber of the present utility model.

[0017] Figure 2 Schematic diagram of the head mounting panel structure in the dual-mode hydrogen low-pollution combustion chamber of the present utility model.

[0018] Figure 3 Schematic diagram of the median-class nozzle structure in the dual-mode hydrogen low-pollution combustion chamber of the present utility model.

[0019] Figure 4 Schematic diagram of the main combustion stage nozzle structure in the dual-mode hydrogen low-pollution combustion chamber of the present utility model.

[0020] Figure 5 Schematic diagram of the hydrogen supply pipeline structure in the dual-mode hydrogen low-pollution combustion chamber of the present utility model.

[0021] Figure 6 Schematic diagram of the combustion chamber head structure in the dual-mode hydrogen low-pollution combustion chamber of the present utility model.

[0022] In the figure: 1 - Combustion section housing, 2 - Intake section housing, 3 - Combustion chamber head, 4 - Hydrogen main pipe, 5 - Hydrogen branch pipe, 51 - Premixed hydrogen branch pipe, 52 - Diffusion hydrogen branch pipe, 6 - Head mounting panel, 61 - Nozzle mounting hole, 62 - Nozzle boss mounting seat, 7 - Micro-diffusion nozzle, 71 - Micro-diffusion nozzle hydrogen inlet, 72 - Micro-diffusion nozzle hydrogen flow channel, 73 - Micro-diffusion nozzle hydrogen spray hole, 74 - Micro-diffusion nozzle air inlet, 75 - Micro-diffusion nozzle air flow channel, 76 - Micro-diffusion nozzle air spray hole, 77 - Micro-diffusion nozzle boss, 8 - Micro-premixed nozzle, 81 - Micro-premixed nozzle hydrogen inlet, 82 - Valve core, 83 - Valve core opening, 84 - Micro-premixed nozzle hydrogen flow channel, 85 - Support spring, 86 - Spring base, 87 - Micro-premixed nozzle hydrogen spray hole, 88 - Micro-premixed nozzle air inlet, 89 - Micro-premixed nozzle air flow channel, 90 - Premixed spray hole, 91 - Micro-premixed nozzle boss. Specific embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0025] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, further definition and explanation thereof is not required in subsequent figures.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of the present utility model is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present utility model.

[0027] In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0028] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, terms such as "arrangement", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying figures.

[0030] As shown in the Figure 1-6 accompanying drawings, this embodiment provides a dual-mode hydrogen low-pollution combustion chamber, which comprises a combustion section housing 1, an intake section housing 2, a combustion chamber head 3, a hydrogen main pipe 4, and hydrogen branch pipes 5. The combustion section housing 1 is located at the right end of the intake section housing 2. The combustion chamber head 3, the hydrogen main pipe 4, and the hydrogen branch pipes 5 are arranged inside the intake section housing 2, and the hydrogen branch pipes 5 are evenly distributed circumferentially along the hydrogen main pipe 4 and connected to the combustion chamber head 3.

[0031] As a preferred embodiment of the present utility model, the combustion chamber head 3 comprises a head mounting panel 6, a micro-diffusion nozzle 7, and a micro-premixing nozzle 8. The micro-diffusion nozzle 7 and the micro-premixing nozzle 8 are mounted on the head mounting panel 6.

[0032] As a preferred embodiment of the present utility model, the head mounting panel 6 is provided with a plurality of nozzle mounting holes 61, and a nozzle boss mounting seat 62 is arranged at the edge of the nozzle mounting hole 61. A nozzle mounting hole 61 is provided at the center position of the head mounting panel 6, and then two circumferentially uniformly arranged circles of nozzle mounting holes 61 are distributed radially. The number of nozzle mounting holes 61 in the inner circle ranges from 3 to 9, and the number of nozzle mounting holes 61 in the outer circle ranges from 6 to 12.

[0033] As a preferred embodiment of the present utility model, the micro-diffusion nozzle 7 includes a micro-diffusion nozzle hydrogen inlet 71, a micro-diffusion nozzle hydrogen flow channel 72, a micro-diffusion nozzle hydrogen spray hole 73, a micro-diffusion nozzle air inlet 74, a micro-diffusion nozzle air flow channel 75, a micro-diffusion nozzle air spray hole 76 and a micro-diffusion nozzle boss 77; the micro-diffusion nozzle hydrogen inlet 71 is connected to the hydrogen branch pipe 5 to allow hydrogen to enter the micro-diffusion nozzle hydrogen flow channel 72. The micro-diffusion nozzle hydrogen spray hole 73 is a radial through hole circumferentially uniformly distributed along the end wall surface of the micro-diffusion nozzle 7. The micro-diffusion nozzle air flow channel 75 is circumferentially uniformly distributed outside the micro-diffusion nozzle hydrogen flow channel 72, and is provided with a micro-diffusion nozzle air inlet 74 and a micro-diffusion nozzle air spray hole 76 corresponding to the micro-diffusion nozzle hydrogen inlet 71 and the micro-diffusion nozzle hydrogen spray hole 73. The number of the micro-diffusion nozzle hydrogen spray holes 73 corresponds one-to-one to the number of the micro-diffusion nozzle air spray holes 76, and the number ranges from 3 to 6. A circle of micro-diffusion nozzle bosses 77 is arranged on the outer wall surface of the micro-diffusion nozzle 7 to realize the axial installation and positioning of the micro-diffusion nozzle 7, and is welded to the nozzle boss mounting seat 62 on the head mounting panel 6. Hydrogen flows into the micro-diffusion nozzle hydrogen flow channel 72 through the micro-diffusion nozzle hydrogen inlet 71 of the micro-diffusion nozzle 7, and then flows out from the circumferentially uniformly distributed radial micro-diffusion nozzle hydrogen spray holes 73 on the end wall surface of the micro-diffusion nozzle 7. Air flows into the micro-diffusion nozzle air flow channel 75 from the micro-diffusion nozzle air inlet 74, and then flows out from the end micro-diffusion nozzle air spray hole 76. Furthermore, downstream of the micro-diffusion nozzle air spray hole 76, the air and hydrogen are transversely jet-mixed to achieve rapid and efficient mixing within a short distance.

[0034] As a preferred embodiment of the present utility model, the micro-premixing nozzle 8 includes a check valve assembly, a hydrogen inlet 81 of the micro-premixing nozzle, a hydrogen flow channel 84 of the micro-premixing nozzle, a hydrogen injection hole 87 of the micro-premixing nozzle, an air inlet 88 of the micro-premixing nozzle, an air flow channel 89 of the micro-premixing nozzle, a premixed injection hole 90, and a boss 91 of the micro-premixing nozzle; the check valve assembly is arranged inside the hydrogen flow channel 84 of the micro-premixing nozzle, the hydrogen inlet 81 of the micro-premixing nozzle is connected to the hydrogen branch pipe 5, so that hydrogen enters the hydrogen flow channel 84 of the micro-premixing nozzle, the hydrogen injection hole 87 of the micro-premixing nozzle is a radial through hole uniformly distributed circumferentially along the end wall surface of the micro-premixing nozzle 8, the air flow channel 89 of the micro-premixing nozzle is uniformly distributed circumferentially outside the hydrogen flow channel 84 of the micro-premixing nozzle, and is provided with an air inlet 88 of the micro-premixing nozzle corresponding to the hydrogen inlet 81 of the micro-premixing nozzle, and the number of the hydrogen injection holes 87 of the micro-premixing nozzle and the air inlet 88 of the micro-premixing nozzle corresponds one by one, and the number range is 3 to 6. A circle of bosses 91 of the micro-premixing nozzle is arranged on the outer wall surface of the micro-premixing nozzle 8 to realize the axial installation and positioning of the micro-premixing nozzle 8, and is welded and connected to the nozzle boss mounting seat 62 on the head mounting panel 6.

[0035] As a preferred embodiment of the present utility model, the check valve assembly includes a valve core 82, a valve core opening 83, a support spring 85, and a spring base 86; the support spring 85 is installed on the spring base 86, the valve core 82 is sleeved on the support spring 85, and the valve core opening 83 is arranged at the end of the valve core 82.

[0036] As a preferred embodiment of the present utility model, premixed hydrogen branch pipes 51 and diffused hydrogen branch pipes 52 are respectively arranged axially on the hydrogen main pipe 4. The premixed hydrogen branch pipe 51 is connected to the hydrogen inlet 81 of the micro-premixing nozzle 8 by welding, and the diffused hydrogen branch pipe 52 is also connected to the hydrogen inlet 71 of the micro-diffusion nozzle 7 by welding.

[0037] Working principle: At low heat power of the combustion chamber, it is in the micro-diffusion combustion mode. At this time, due to the small inlet air flow rate, only the duty-class micro-diffusion nozzle is opened. The micro-diffusion combustion method is used to improve the combustion stability, fundamentally avoid the risks of hydrogen backfire and spontaneous combustion, and can also effectively reduce the nitrogen oxide emissions. At high heat power of the combustion chamber, it is in the micro-diffusion - micro-premixing combined combustion mode. At this time, due to the large inlet air flow rate, the duty-class micro-diffusion nozzle and the main combustion stage micro-premixing nozzle are opened simultaneously. The main combustion stage hydrogen nozzle adopts the micro-premixing combustion method, which can greatly reduce the nitrogen oxide emissions. At the same time, the duty-class micro-diffusion nozzle is used as an ignition source to improve the combustion stability of the main combustion stage hydrogen. At the same time, under the condition of a large-flow air inlet, the flow velocity at the nozzle outlet is relatively high, which can effectively inhibit the backfire problem of the main combustion stage hydrogen premixing nozzle.

[0038] When the combustion chamber is in a low heat power state, the supplied hydrogen pressure is relatively low. When it is less than the elastic force generated by the support spring 85, the valve core 82 blocks the hydrogen inlet 81 of the micro-premixed nozzle 8 of the micro-premixed nozzle. The micro-premixed nozzle 8 does not work, and only the micro-diffusion nozzle 7 works to match the low heat power mode of the combustion chamber. At the same time, the combustion stability can be improved in the diffusion combustion mode, fundamentally avoiding the risks of hydrogen backfire and spontaneous combustion, and can also suppress the emission of nitrogen oxides to a certain extent. When the combustion chamber is in a high heat power state, the supplied hydrogen pressure is relatively high. When it is greater than the elastic force generated by the support spring 85, the hydrogen pushes the valve core 82 and flows into the hydrogen flow channel 84 of the micro-premixed nozzle. Thus, the micro-premixed nozzle 8 and the micro-diffusion nozzle 7 work simultaneously to match the high heat power mode of the combustion chamber. Since the main combustion stage hydrogen nozzle adopts the premixed combustion method, the emission of nitrogen oxides can be greatly reduced. At the same time, the value class micro-diffusion nozzle is used as an ignition source to improve the combustion stability of the main combustion stage hydrogen. At the same time, under the high heat power of the combustion chamber, the air flow rate at the combustion chamber inlet is large, and the flow velocity at the outlet of the premixed nozzle hole 90 is relatively high, which can effectively suppress the backfire problem of the main combustion stage hydrogen premixed nozzle.

[0039] Although the present invention has been described herein with reference to illustrative embodiments of the present invention, the above embodiments are only preferred embodiments of the present invention. The embodiments of the present invention are not limited by the above embodiments. It should be understood that those skilled in the art can design many other modifications and embodiments, and these modifications and embodiments will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A dual-mode hydrogen low-pollution combustion chamber, comprising a combustion section shell (1), an air intake section shell (2), a combustion chamber head (3), a hydrogen main pipe (4) and a hydrogen branch pipe (5), wherein the combustion section shell (1) is located at the right end of the air intake section shell (2), the combustion chamber head (3), the hydrogen main pipe (4) and the hydrogen branch pipe (5) are arranged inside the air intake section shell (2), and the hydrogen branch pipe (5) is evenly distributed along the circumference of the hydrogen main pipe (4) and connected to the combustion chamber head (3).

2. The dual-mode hydrogen low-pollution combustion chamber according to claim 1, characterized in that: The combustion chamber head (3) comprises a head mounting panel (6), a micro-diffusion nozzle (7) and a micro-premixing nozzle (8), wherein the micro-diffusion nozzle (7) and the micro-premixing nozzle (8) are mounted on the head mounting panel (6).

3. The dual-mode hydrogen low-pollution combustion chamber according to claim 2 is characterized in that: The head mounting panel (6) is provided with a plurality of nozzle mounting holes (61), and a nozzle boss mounting seat (62) is arranged at the edge of the nozzle mounting hole (61); a nozzle mounting hole (61) is provided at the center of the head mounting panel (6), and then two circles of nozzle mounting holes (61) are distributed radially and evenly arranged circumferentially; the number of the nozzle mounting holes (61) in the inner circle ranges from 3 to 9, and the number of the nozzle mounting holes (61) in the outer circle ranges from 6 to 12.

4. The dual-mode hydrogen low-pollution combustion chamber according to claim 2 or 3, characterized in that: The micro-diffusion nozzle (7) comprises a micro-diffusion nozzle hydrogen inlet (71), a micro-diffusion nozzle hydrogen flow channel (72), a micro-diffusion nozzle hydrogen spray hole (73), a micro-diffusion nozzle air inlet (74), a micro-diffusion nozzle air flow channel (75), a micro-diffusion nozzle air spray hole (76) and a micro-diffusion nozzle boss (77); the micro-diffusion nozzle hydrogen inlet (71) is connected to the hydrogen branch pipe (5) so that hydrogen enters the micro-diffusion nozzle hydrogen flow channel (72); the micro-diffusion nozzle hydrogen spray hole (73) is a radial through hole uniformly distributed along the circumferential direction of the wall surface of the micro-diffusion nozzle (7); the micro-diffusion nozzle air flow channel (75) is radially distributed along the circumferential direction of the micro-diffusion nozzle (7). The micro-diffusion nozzle (72) is evenly distributed on the outside of the micro-diffusion nozzle hydrogen flow channel (72), and is provided with a micro-diffusion nozzle air inlet (74) and a micro-diffusion nozzle air spray hole (76) corresponding to the micro-diffusion nozzle hydrogen inlet (71) and the micro-diffusion nozzle hydrogen spray hole (73). The number of the micro-diffusion nozzle hydrogen spray holes (73) and the number of the micro-diffusion nozzle air spray holes (76) correspond to each other in a one-to-one manner, and the number ranges from 3 to 6. The micro-diffusion nozzle boss (77) is arranged in a circle along the outer wall surface of the micro-diffusion nozzle (7), and is welded to the nozzle boss mounting seat (62) on the head mounting panel (6), so as to realize the axial mounting and positioning of the micro-diffusion nozzle (7).

5. The dual-mode hydrogen low-pollution combustion chamber according to claim 2 or 3, characterized in that: The micro-premixing nozzle (8) comprises a one-way valve assembly, a micro-premixing nozzle hydrogen inlet (81), a micro-premixing nozzle hydrogen flow channel (84), a micro-premixing nozzle hydrogen spray hole (87), a micro-premixing nozzle air inlet (88), a micro-premixing nozzle air flow channel (89), a premixing spray hole (90), and a micro-premixing nozzle boss (91); the one-way valve assembly is arranged inside the micro-premixing nozzle hydrogen flow channel (84); the micro-premixing nozzle hydrogen inlet (81) is connected to the hydrogen branch pipe (5) so that hydrogen enters the micro-premixing nozzle hydrogen flow channel (84); the micro-premixing nozzle hydrogen spray hole (87) is arranged along the end wall of the micro-premixing nozzle (8). The micro-premixing nozzle air flow channel (89) is evenly distributed along the circumference outside the micro-premixing nozzle hydrogen flow channel (84), and a micro-premixing nozzle air inlet (88) corresponding to the micro-premixing nozzle hydrogen inlet (81) is provided. The number of micro-premixing nozzle hydrogen spray holes (87) and micro-premixing nozzle air inlets (88) corresponds to each other in a one-to-one manner, and the number ranges from 3 to 6. The micro-premixing nozzle boss (91) is arranged in a circle along the outer wall of the micro-premixing nozzle (8), and is welded to the nozzle boss mounting seat (62) on the head mounting panel (6), so as to realize the axial mounting and positioning of the micro-premixing nozzle (8).

6. The dual-mode hydrogen low-pollution combustion chamber according to claim 5, characterized in that: The one-way valve assembly comprises a valve core (82), a valve core opening (83), a support spring (85) and a spring base (86); the support spring (85) is mounted on the spring base (86), the valve core (82) is sleeved on the support spring (85), and the valve core opening (83) is arranged on the end of the valve core (82).

7. The dual-mode hydrogen low-pollution combustion chamber according to any one of claims 1-3 and 6, characterized in that: A premixed hydrogen branch pipe (51) and a diffused hydrogen branch pipe (52) are arranged axially on the hydrogen main pipe (4); the premixed hydrogen branch pipe (51) is connected to the micro premixed nozzle (8) and the micro premixed nozzle hydrogen inlet (81) by welding, and the diffused hydrogen branch pipe (52) is also connected to the micro diffused nozzle (7) and the micro diffused nozzle hydrogen inlet (71) by welding.

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