Hydrogen escape prevention premixing and micro-mixing nozzle suitable for various environments

Abstract

The invention relates to the technical field of combustors, and provides a hydrogen escape prevention premixing and micro-mixing nozzle suitable for various environments, which comprises a gas inlet pipe, a spray pipe and a mixing pipe, an air inlet channel is formed in the air inlet pipe; a contraction section, a throttling section and an expansion section are formed in the spray pipe, the gas inlet channel is connected with the contraction section so that the gas flow speed can be increased to the sound speed through the contraction section, the contraction section is connected with the throttling section, and the throttling section is connected with the expansion section; a mixing channel is formed in the mixing pipe, the mixing channel is connected with the expansion section, a first air inlet and a second air inlet are formed in the side wall of the mixing channel, the first air inlet is used for introducing air or water vapor into the mixing channel, and the second air inlet is used for introducing oxygen into the mixing channel. According to the hydrogen escape prevention premixing micro-mixing nozzle suitable for various environments, the defects that an existing micro-mixing combustion technology is poor in low-load stability, narrow in working load range and high in NOx emission are overcome, and the nozzle can be suitable for various environments including water vapor and air.

Description

Technical Field

[0001] The invention relates to the technical field of burners, and in particular to a premixing and micromixing nozzle for preventing hydrogen escape suitable for various environments. Background Art

[0002] The micro nozzles in the micro-mixing combustion chamber can precisely control the flame shape, reduce the flame size, and reduce the residence time in the high temperature zone, thereby achieving low nitrogen emissions. If clean energy such as hydrogen is used as fuel, carbon emissions can be significantly reduced. At present, the research on hydrogen fuel micro-mixing nozzles mainly focuses on the design of straight tube nozzles.

[0003] However, conventional natural gas combustion chambers cannot meet the requirements for safe and efficient combustion of hydrogen-based flexible fuels. Although micro-mixing combustion technology can achieve hydrogen fuel combustion, its stability at low loads is poor, its operating load range is limited, and the flame is prone to combustion oscillation, resulting in high NOx emissions. Summary of the invention

[0004] The present invention provides a hydrogen escape-proof premixing micro-mixing nozzle suitable for various environments, which is used to solve the defects of the existing micro-mixing combustion technology in terms of poor low-load stability, narrow working load range and high NOx emission.

[0005] The present invention provides a premixing and micromixing nozzle for preventing hydrogen escape applicable to various environments, comprising: an air intake pipe, a nozzle and a mixing pipe; An air intake channel is formed in the air intake pipe; a contraction section, a throttling section and an expansion section are formed in the nozzle, the outlet end of the air intake channel is connected to the inlet end of the contraction section so that the gas flow rate is increased to the speed of sound through the contraction section, the outlet end of the contraction section is connected to the inlet end of the throttling section, and the outlet end of the throttling section is connected to the inlet end of the expansion section; a mixing channel is formed in the mixing tube, the inlet end of the mixing channel is connected to the outlet end of the expansion section, and a first air inlet and a second air inlet are provided on the side wall of the mixing channel, the first air inlet is used to introduce air or water vapor into the mixing channel, and the second air inlet is used to introduce oxygen into the mixing channel.

[0006] According to the hydrogen escape prevention premixing and micro-mixing nozzle suitable for various environments provided by the present invention, the aperture of the throttling section is 0.4 mm to 2 mm, and the ratio of the length of the throttling section to the aperture of the throttling section is 1 to 2.

[0007] According to the hydrogen escape prevention premixing and micro-mixing nozzle applicable to various environments provided by the present invention, the contraction rate of the contraction section is greater than or equal to 2.

[0008] According to the hydrogen escape prevention premixing and micro-mixing nozzle suitable for various environments provided by the present invention, the expansion rate of the expansion section is greater than or equal to 2.

[0009] According to the hydrogen escape prevention premixing and micro-mixing nozzle applicable to various environments provided by the present invention, the first air inlet is located upstream of the second air inlet, and the diameter of the first air inlet is greater than the diameter of the second air inlet.

[0010] According to the hydrogen escape prevention premixing and micro-mixing nozzle suitable for a variety of environments provided by the present invention, a baffle is provided at the outlet end of the expansion section, a guide pipe is provided on the baffle, the inlet end of the guide pipe is connected to the outlet end of the expansion section, the outlet end of the guide pipe is connected to the mixing channel, and the outlet end of the guide pipe is located downstream of the first air inlet.

[0011] According to the hydrogen escape prevention premixing and micro-mixing nozzle applicable to various environments provided by the present invention, the outlet end of the guide tube is located upstream of the second air inlet.

[0012] According to the hydrogen escape prevention premixing and micro-mixing nozzle suitable for various environments provided by the present invention, a plurality of first air inlet groups are arranged at intervals along the circumferential direction on the side wall of the mixing tube, and the first air inlet group includes a plurality of first air inlets arranged at intervals along the circumferential direction.

[0013] According to the hydrogen escape prevention premixing and micro-mixing nozzle applicable to various environments provided by the present invention, a plurality of the second air inlets are provided on the side wall of the mixing tube at intervals along the circumferential direction.

[0014] According to the hydrogen escape prevention premixing and micro-mixing nozzle applicable to various environments provided by the present invention, the air intake pipe, the nozzle and the mixing pipe are integrally arranged.

[0015] The hydrogen escape-proof premixing micro-mixing nozzle provided by the present invention is applicable to various environments. By arranging a nozzle between the intake pipe and the mixing pipe, the contraction section formed in the nozzle can be used to increase the gas flow rate to the sonic speed and enter the throttling section. The existence of the sonic speed zone in the throttling section can prevent the pressure pulsation of the downstream channel from affecting the gas flow in the upstream intake channel, thereby ensuring the flow stability of the upstream gas, and solving the defects of the existing micro-mixing combustion technology in terms of poor low-load stability, narrow working load range and high NOx emissions. In addition, by arranging the first air inlet and the second air inlet on the mixing pipe, the nozzle can be applied to various environments including water vapor and air.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of a premixing or micromixing nozzle for preventing hydrogen escape and applicable to various environments provided by an embodiment of the present invention.

[0019] Figure 2 It is a cross-sectional view of a premixing or micromixing nozzle for preventing hydrogen escape applicable to various environments provided by an embodiment of the present invention.

[0020] Figure 3 yes Figure 2 A is a partial enlarged schematic diagram of the middle part.

[0021] Figure 4 Schematic diagram of an array micro-tube nozzle burner provided in an embodiment of the present invention.

[0022] Figure 5 It is a cross-sectional view of an array micro-tube nozzle burner provided in an embodiment of the present invention.

[0023] Reference numerals: 10. Intake pipe; 110. Intake channel; 20. Nozzle; 210. Contraction section; 220. Throttling section; 230. Expansion section; 240. Baffle; 250. Guide tube; 30. Mixing tube; 310. Mixing channel; 320. First air inlet; 330. Second air inlet; 40. Fixed seat. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it 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. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0027] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0029] Combine the following Figures 1 to 5 The invention provides a premixing and micromixing nozzle for preventing hydrogen escape and suitable for various environments.

[0030] See also Figures 1 to 3 As shown, the hydrogen escape prevention premixing and micro-mixing nozzle applicable to various environments provided by the embodiment of the present invention includes: an intake pipe 10, a nozzle 20 and a mixing pipe 30.

[0031] An air intake channel 110 is formed in the air intake pipe 10; a contraction section 210, a throttling section 220 and an expansion section 230 are formed in the nozzle 20, the outlet end of the air intake channel 110 is connected to the inlet end of the contraction section 210 so as to increase the gas flow rate to the speed of sound through the contraction section 210, the outlet end of the contraction section 210 is connected to the inlet end of the throttling section 220, and the outlet end of the throttling section 220 is connected to the inlet end of the expansion section 230; a mixing channel 310 is formed in the mixing tube 30, the inlet end of the mixing channel 310 is connected to the outlet end of the expansion section 230, and a first air inlet 320 and a second air inlet 330 are provided on the side wall of the mixing channel 310, the first air inlet 320 is used to pass air or water vapor into the mixing channel 310, and the second air inlet 330 is used to pass oxygen into the mixing channel 310.

[0032] The hydrogen escape-proof premixing micro-mixing nozzle provided by the present invention is applicable to various environments. By arranging the nozzle 20 between the intake pipe 10 and the mixing pipe 30, the gas flow rate can be increased to the sonic velocity by utilizing the contraction section 210 formed in the nozzle 20 and enter the throttling section 220. The existence of the sonic velocity zone of the throttling section 220 can prevent the pressure pulsation of the downstream channel from affecting the gas flow of the upstream intake channel 110, thereby ensuring the flow stability of the upstream gas, and solving the defects of the existing micro-mixing combustion technology in poor low-load stability, narrow working load range and high NOx emissions. In addition, by arranging the first air inlet 320 and the second air inlet 330 on the mixing pipe 30, the nozzle can be applied to various environments including water vapor and air.

[0033] Specifically, the gas with a certain flow rate enters through the air inlet channel 110. When it reaches the contraction section 210 of the nozzle 20, the gas flow rate will gradually increase to the speed of sound and enter the throttling section 220 because the inner diameter of the contraction section 210 gradually decreases along the gas flow direction. In the throttling section 220, the gas can flow at the speed of sound. When the gas reaches the speed of sound in the throttling section 220 of the nozzle 20, the flow rate of the gas is the same as the propagation speed of the pressure fluctuation. This means that if pressure pulsation occurs in the downstream channel, the fluctuation of the pressure pulsation will also propagate at the speed of sound, but at this time the flow rate of the fluid has matched the speed of sound, so the pressure pulsation will no longer affect the flow in the upstream area. In short, in the state of sonic flow, the propagation of the flow and pressure fluctuations is "locked" in a local area and cannot propagate in the reverse direction or affect the upstream flow, so that the pressure pulsation of the downstream channel cannot affect the gas flow in the upstream air inlet channel 110, thereby ensuring the flow stability of the upstream gas.

[0034] The side wall of the mixing channel 310 is provided with a first air inlet 320 and a second air inlet 330. The first air inlet 320 is used to introduce air or water vapor into the mixing channel 310, and the second air inlet 330 is used to introduce oxygen into the mixing channel 310. Air, water vapor or oxygen can enter the mixing channel 310 in the form of a transverse jet and mix with the fuel.

[0035] Among them, under air conditions, air can enter the mixing channel 310 through the first air inlet 320 in the form of a transverse jet. At this time, the second air inlet 330 can be closed. Similarly, under water vapor conditions, water vapor can enter the mixing channel 310 through the first air inlet 320 in the form of a transverse jet, and at the same time, oxygen enters the mixing channel 310 through the second air inlet 330 in the form of a transverse jet.

[0036] See also Figures 1 to 3 As shown, according to some embodiments of the present invention, the aperture of the throttling section 220 is 0.4 mm to 2 mm, and the ratio of the length of the throttling section 220 to the aperture of the throttling section 220 is 1 to 2.

[0037] By setting the aperture of the throttling section 220 to 0.4 mm to 2 mm, the airflow velocity and flow rate can be effectively controlled, and the velocity and flow rate of the fluid flow can be accurately controlled, thereby ensuring that the airflow reaches the required conditions when entering the subsequent channel. By setting the ratio of the length value of the throttling section 220 to the aperture value of the throttling section 220 to 1 to 2, the longer throttling section 220 can provide a greater pressure drop, thereby reducing the instability or pulsation of the airflow in the throttling section 220, avoiding turbulence in the airflow, and maintaining the laminar flow state of the flow.

[0038] Specifically, the aperture of the throttling section 220 may be 0.4 mm, 0.8 mm, 1 mm or 2 mm, etc., and the ratio of the length of the throttling section 220 to the aperture of the throttling section 220 may be 1, 1.5 or 2, etc.

[0039] See also Figure 3 As shown, according to some embodiments of the present invention, the contraction ratio of the contraction section 210 is greater than or equal to 2.

[0040] By setting the contraction rate of the contraction section 210 to be greater than or equal to 2, the gas flow rate can be quickly increased in the contraction section 210, and can be increased to the set flow rate (sound speed) in a short time, and the length of the contraction section 210 can be shortened. This not only improves the acceleration efficiency of the gas flow, reduces the required space and time, but also helps to reduce pressure loss.

[0041] Specifically, the shrinkage ratio of the shrinkage section 210 may be 2, 2.1, or 2.2, etc.

[0042] See also Figure 3As shown, according to some embodiments of the present invention, the expansion ratio of the expansion section 230 is greater than or equal to 2.

[0043] By setting the expansion rate of the expansion section 230 to be greater than or equal to 2, the high-speed fluid flowing out of the throttling section 220 can quickly reduce its flow rate to a set range so that it can be subsequently mixed with air, water vapor or oxygen in the mixing channel 310, thereby avoiding uneven mixing due to excessively high flow rate.

[0044] Specifically, the expansion ratio of the expansion section 230 may be 2, 2.1, or 2.2, etc.

[0045] See also Figures 1 to 3 As shown, according to some embodiments of the present invention, the first air inlet 320 is located upstream of the second air inlet 330 , and the diameter of the first air inlet 320 is greater than the diameter of the second air inlet 330 .

[0046] By arranging the first air inlet 320 upstream of the second air inlet 330 and making the diameter of the first air inlet 320 larger than the diameter of the second air inlet 330, water vapor or air can enter the mixing channel 310 from the first air inlet 320, mix with hydrogen first, and then be sprayed into the mixing channel 310 from the second air inlet 330 to mix with oxygen, thereby avoiding direct mixing of hydrogen and oxygen and preventing spontaneous combustion or high-temperature ablation.

[0047] See also Figure 2 As shown, according to some embodiments of the present invention, a baffle 240 is provided at the outlet end of the expansion section 230, a guide pipe 250 is provided on the baffle 240, an inlet end of the guide pipe 250 is connected to the outlet end of the expansion section 230, an outlet end of the guide pipe 250 is connected to the mixing channel 310, and the outlet end of the guide pipe 250 is located downstream of the first air inlet 320.

[0048] By arranging a baffle 240 at the outlet end of the expansion section 230 and arranging a flow guide 250 on the baffle 240, the baffle 240 can be used to block the gas whose flow rate is reduced to within a set range, and the gas can enter the mixing channel 310 through the flow guide 250, and because the outlet end of the flow guide 250 is located downstream of the first air inlet 320, the gas can be prevented from escaping to the outside of the mixing channel 310 through the first air inlet 320. Specifically, since the aperture of the first air inlet 320 is relatively large, if the outlet end of the flow guide 250 is located upstream thereof, the gas will escape from the first air inlet 320 to the outside of the mixing channel 310 after coming out of the flow guide 250.

[0049] It should be noted that there is at least one flow guide pipe 250. When there is only one flow guide pipe 250, it is disposed at the center of the baffle 240. When there are multiple flow guide pipes 250, multiple flow guide pipes 250 are evenly arranged on the baffle 240, so that the airflow can evenly enter the mixing channel 310.

[0050] See also Figure 2 As shown, according to some embodiments of the present invention, the outlet end of the flow guide tube 250 is located upstream of the second air inlet 330 .

[0051] By arranging the outlet end of the flow guide pipe 250 upstream of the second air inlet 330, the outlet end of the flow guide pipe 250 is located between the first air inlet 320 and the second air inlet 330, so that the fuel gas can be more fully mixed with water vapor and oxygen under water vapor conditions.

[0052] See also Figure 2 As shown, according to some embodiments of the present invention, a plurality of first air inlet groups are provided on the side wall of the mixing tube 30 at intervals along the circumferential direction, and the first air inlet group includes a plurality of first air inlets 320 provided at intervals along the circumferential direction.

[0053] By setting the first air inlet 320 to the above form, the air / water vapor intake efficiency and intake uniformity can be improved, the mixing efficiency of air / water vapor and fuel gas can be improved, and local overspeed or airflow turbulence can be reduced, thereby improving the stability of the airflow in the mixing channel 310.

[0054] Specifically, the arrangement of multiple first air inlets 320 increases the overall air intake area of ​​the air intake channel 110, and can simultaneously introduce more air / water vapor, which can increase the air intake volume per unit time, thereby improving the air intake efficiency of the mixing channel 310. In addition, multiple first air inlets 320 arranged at intervals along the circumference can effectively improve the uniformity of air / water vapor intake, and by dispersing the airflow, avoid the problem of uneven airflow caused by air intake through a single air inlet, achieve more uniform gas distribution, improve the mixing effect, and reduce local overspeed or airflow turbulence.

[0055] See also Figure 2 As shown, according to some embodiments of the present invention, a plurality of second air inlets 330 are provided on the side wall of the mixing tube 30 at intervals along the circumferential direction.

[0056] By arranging a plurality of second air inlets 330 at circumferential intervals on the side wall of the mixing tube 30 , the oxygen intake efficiency and intake uniformity can be significantly improved, the mixing efficiency of oxygen and fuel gas can be improved, and local overspeed or air flow turbulence can be reduced, thereby improving the stability of the air flow in the mixing channel 310 .

[0057] Specifically, the arrangement of multiple second air inlets 330 increases the overall air intake area of ​​the air intake channel 110, can introduce more oxygen at the same time, can increase the air intake volume per unit time, and thus improve the air intake efficiency of the mixing channel 310. In addition, multiple second air inlets 330 arranged at intervals along the circumference can effectively improve the uniformity of oxygen intake, and by dispersing the airflow, avoid the problem of uneven airflow caused by air intake through a single air inlet, achieve more uniform gas distribution, improve the mixing effect, and reduce local overspeed or airflow turbulence.

[0058] According to some embodiments of the present invention, the air intake pipe 10, the nozzle 20 and the mixing pipe 30 are integrally arranged.

[0059] By configuring the air intake pipe 10, the nozzle 20 and the mixing pipe 30 as an integrated arrangement, it is possible to reduce pipeline connections and reduce structural complexity.

[0060] In some embodiments, the air intake pipe 10, the nozzle 20 and the mixing tube 30 may also be connected by welding.

[0061] The array micro-tube nozzle burner provided in an embodiment of the present invention is described below. The array micro-tube nozzle burner described below and the hydrogen escape prevention premixing micro-mixing nozzle applicable to various environments described above can be referred to each other.

[0062] See also Figure 4 and Figure 5 As shown, the array micro-tube nozzle burner provided in an embodiment of the present invention includes a fixed seat 40 and a plurality of premixing and micro-mixing nozzles for preventing hydrogen escape and suitable for a variety of environments as described in any of the above embodiments, and a plurality of arrays of premixing and micro-mixing nozzles for preventing hydrogen escape and suitable for a variety of environments are arranged on the fixed seat 40.

[0063] It should be noted that the array of the plurality of hydrogen escape prevention premixing and micromixing nozzles applicable to various environments on the fixing seat 40 includes various arrays, such as a rectangular array, a circular array, and the like.

[0064] As an example, in the array micro-tube nozzle burner of this embodiment, the hydrogen escape-proof premixing and micro-mixing nozzles suitable for various environments are arranged on the fixing seat 40 in the form of a rectangular array.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A premixing and micromixing nozzle suitable for various environments to prevent hydrogen escape, characterized in that: include: An air intake pipe, wherein an air intake passage is formed in the air intake pipe; a nozzle, wherein a contraction section, a throttling section and an expansion section are formed in the nozzle, the outlet end of the air inlet passage is connected to the inlet end of the contraction section so that the gas flow velocity is increased to the speed of sound through the contraction section, the outlet end of the contraction section is connected to the inlet end of the throttling section, and the outlet end of the throttling section is connected to the inlet end of the expansion section; A mixing tube, wherein a mixing channel is formed in the mixing tube, wherein the inlet end of the mixing channel is connected to the outlet end of the expansion section, and the side wall of the mixing channel is provided with a first air inlet and a second air inlet, wherein the first air inlet is used to introduce air or water vapor into the mixing channel, and the second air inlet is used to introduce oxygen into the mixing channel.

2. The hydrogen escape-proof premixing and micro-mixing nozzle suitable for various environments according to claim 1 is characterized in that: The aperture of the throttling section is 0.4 mm to 2 mm, and the ratio of the length of the throttling section to the aperture of the throttling section is 1 to 2.

3. The hydrogen escape-proof premixing and micromixing nozzle suitable for various environments according to claim 1 is characterized in that: The shrinkage ratio of the shrinkage section is greater than or equal to 2.

4. The hydrogen escape-proof premixing and micromixing nozzle suitable for various environments according to claim 1 is characterized in that: The expansion rate of the expansion section is greater than or equal to 2.

5. The hydrogen escape prevention premixing and micro-mixing nozzle suitable for various environments according to any one of claims 1 to 4, characterized in that: The first air inlet is located upstream of the second air inlet, and a diameter of the first air inlet is greater than a diameter of the second air inlet.

6. The hydrogen escape prevention premixing and micro-mixing nozzle suitable for various environments according to claim 5 is characterized in that: The outlet end of the expansion section is provided with a baffle, the baffle is provided with a guide pipe, the inlet end of the guide pipe is connected to the outlet end of the expansion section, the outlet end of the guide pipe is connected to the mixing channel, and the outlet end of the guide pipe is located downstream of the first air inlet.

7. The hydrogen escape prevention premixing and micro-mixing nozzle suitable for various environments according to claim 6 is characterized in that: The outlet end of the flow guide pipe is located upstream of the second air inlet.

8. The hydrogen escape-proof premixing and micro-mixing nozzle suitable for various environments according to any one of claims 1 to 4, characterized in that: The side wall of the mixing tube is provided with a plurality of first air inlet groups spaced apart along the circumferential direction, and the first air inlet group includes a plurality of first air inlets spaced apart along the circumferential direction.

9. The hydrogen escape prevention premixing and micro-mixing nozzle suitable for various environments according to any one of claims 1 to 4, characterized in that: The side wall of the mixing tube is provided with a plurality of the second air inlets at intervals along the circumferential direction.

10. The hydrogen escape prevention premixing and micro-mixing nozzle suitable for various environments according to any one of claims 1 to 4, characterized in that: The air intake pipe, the nozzle and the mixing pipe are integrally arranged.

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