A gas blender

Abstract

The application discloses a gas mixing device, which comprises a mixing body, a mixing channel arranged in the mixing body and having an air inlet and an air outlet leading to the outside of the mixing body, and a mixing buttling section arranged in the mixing body and at least one section along the extension direction of the mixing channel. Each mixing buttling section comprises at least one buttling channel, which is arc-shaped along the extension direction of the mixing channel, and the inlet and outlet of the buttling channel are connected to the mixing channel, so that the mixed gas in the mixing channel is divided into the buttling channel from the inlet and returned to the mixing channel from the outlet to collide with the gas in the mixing channel. The application can improve the mixing uniformity of hydrogen and natural gas, prevent gas stratification and excessive local hydrogen concentration when high proportion of hydrogen is mixed, reduce the risk of combustion knock and pipe network corrosion, and improve the mixing safety and operation stability.

Description

Technical Field

[0001] This invention relates to the field of gas mixing technology, and in particular to a gas mixer. Background Technology

[0002] Gas blending refers to the process of thoroughly mixing two or more gases with different compositions or properties according to a predetermined volume ratio or mass ratio to obtain a mixed gas with specific physical properties and process applicability.

[0003] Blending hydrogen into natural gas is an important research direction in the current energy field. Utilizing hydrogen's zero-carbon fuel properties, emissions of pollutants such as carbon dioxide and black carbon from natural gas combustion can be directly reduced, helping to reduce carbon emissions in the gas utilization process. Furthermore, injecting hydrogen energy into existing natural gas pipeline networks and end-use energy equipment in a blended form can facilitate the large-scale consumption of green hydrogen produced from renewable energy sources, alleviating the bottlenecks of high independent hydrogen storage and transportation costs and insufficient infrastructure, and providing a realistic path for the large-scale, low-cost transportation and utilization of hydrogen energy.

[0004] Existing natural gas hydrogenation blending equipment mainly includes Venturi jet mixers, static spiral mixers, baffle turbulent mixers, and mechanically assisted mixers. In actual use, hydrogen and natural gas have a large density difference. Conventional mixing channels can only achieve simple turbulent mixing, resulting in poor mixing uniformity. When the proportion of hydrogen is high, gas stratification and local hydrogen concentration exceeding the standard are very likely to occur, posing risks of combustion knocking and pipeline corrosion.

[0005] Therefore, it is urgent to research and develop a gas mixer to solve the above-mentioned technical defects. Summary of the Invention

[0006] The purpose of this invention is to provide a gas mixer that can improve the mixing uniformity of hydrogen and natural gas, prevent gas stratification and local hydrogen concentration exceeding the standard when a high proportion of hydrogen is added, thereby reducing the risk of combustion knock and pipeline corrosion, and improving the safety and operational stability of the mixing process.

[0007] To achieve the above objectives, the present invention provides a gas mixer, the specific implementation of which is as follows: A gas mixer, comprising: Blending main body; A mixing channel is provided inside the mixing body and has an air inlet and an air outlet that connect to the outside of the mixing body; A mixing counter-current section is provided within the mixing body, and at least one section is provided along the extension direction of the mixing channel; Each of the mixing and counteracting sections includes at least one counteracting channel. The counteracting channel is arc-shaped along the extension direction of the mixing channel. The inlet and outlet of the counteracting channel are both connected to the mixing channel, so that the mixed gas in the mixing channel is diverted from the inlet to the counteracting channel and returns to the mixing channel from the outlet to counteract the gas in the mixing channel.

[0008] This invention discloses a gas mixer that, compared to existing technologies, incorporates an arc-shaped counter-current channel extending along the mixing channel's direction. This channel connects both the inlet and outlet of the mixing channel. When the mixed gas flows through the mixing channel, a portion of the gas is diverted from the inlet into the counter-current channel, then redirected via the arc-shaped path before flowing back from the outlet to the mixing channel. This counter-current flow counter-current flow creates a multiple cycle of diversion, return, and counter-current flow, enhancing momentum exchange and component mixing between gases of different densities. This significantly improves the uniformity of hydrogen and natural gas mixing, effectively preventing gas stratification and localized hydrogen concentration exceeding limits when using high-proportion hydrogen blending, and reducing the risks of combustion knocking and pipeline corrosion.

[0009] In some embodiments, the hybrid hedging section includes two sets of hedging units, each set of hedging units including at least one of the hedging channels; The inlet of the downstream hedging channel is located between the inlet and outlet of the upstream hedging channel in the direction of extension of the mixing channel.

[0010] By setting the mixing and hedging section as two sets of spaced hedging units, and placing the inlet of the downstream hedging channel between the inlet and outlet of the upstream hedging channel in the direction of the mixing channel extension, the gas flow that is not yet fully homogenized after the upstream hedging channel completes one backflow hedging is diverted into the downstream hedging channel for a second backflow hedging. This forms a multi-stage continuous hedging effect, which further prolongs the separation time of hydrogen from natural gas and improves the overall uniformity and stability of the mixing.

[0011] In some embodiments, each set of the hedging units includes a plurality of hedging channels arranged in an array along the circumferential direction of the mixing channels.

[0012] By arranging several counter-current channels in each counter-current unit in an array along the circumferential direction of the mixing channel, the gas is simultaneously diverted and counter-currented from multiple circumferential directions of the mixing channel. This allows the gas to undergo multi-stage mixing in the axial direction and form multiple counter-current airflows intertwined in the circumferential direction, creating a three-dimensional mixing flow field. This avoids the uneven circumferential mixing caused by unilateral diversion and further improves the consistency of the cross-sectional concentration distribution.

[0013] In some embodiments, the outer peripheral wall of the blending body is spirally wound with conductive wires, and both ends of the blending body are provided with grounding terminals that are electrically connected to the conductive wires.

[0014] By spirally winding conductive wires around the outer peripheral wall of the blending body and setting ground terminals at both ends, the static electricity generated by the high-pressure gas flow friction is rapidly discharged to the ground along the entire spiral wire. This avoids the problem of static electricity accumulation and sparking caused by incomplete discharge due to single-point grounding, and meets the explosion-proof safety requirements in the high-risk hydrogen environment.

[0015] In some embodiments, the conductive wires are spirally wound at equal intervals around the outer peripheral wall of the mixing body along the extension direction of the mixing channel.

[0016] By spirally winding the conductive wires at equal intervals along the extension direction of the mixing channel, a uniform electrostatic discharge path is ensured throughout the entire circumference and axial length of the outer wall of the mixing body, eliminating the generation of electrostatic discharge dead zones and further improving the reliability and safety of the overall anti-static system.

[0017] In some embodiments, a preliminary mixer is also included, the outlet of which is connected to the inlet of the mixing channel for preliminary mixing of the gas entering the mixing channel.

[0018] By setting up a preliminary mixer and connecting its outlet to the inlet of the mixing channel, preliminary mixing is performed before the gas enters the mixing counter-mixing section. This reduces the concentration gradient of the two gases when they enter the mixing channel, reduces the mixing load of the subsequent mixing counter-mixing section, and helps to improve the overall mixing efficiency and outlet concentration stability.

[0019] In some embodiments, the preliminary mixing element is a venturi tube, which includes a constriction section, a throat section, and a diffuser section connected sequentially along the airflow direction; The inner peripheral wall of the contraction section gradually contracts inward along the gas transport direction, and the inner peripheral wall of the diffusion section gradually diffuses outward along the gas transport direction. The side of the mixing body is provided with a hydrogen supply section, which is connected to the throat section.

[0020] By setting the preliminary mixing component as a Venturi tube, the main stream of natural gas is accelerated and diffused using the contraction and diffusion sections, and a hydrogen supply section is set on the side of the throat section. Hydrogen is injected and initially mixed by the negative pressure formed by the high-speed airflow at the throat without external boosting drive equipment, which simplifies the system structure and reduces energy consumption and electrical explosion-proof hazards.

[0021] In some embodiments, the contraction cone angle of the contraction segment is 10° to 18°; The diffusion cone angle of the diffusion section is 5° to 10°; The hydrogen supply section is equipped with an anti-backflow cone surface, the cone angle of which is 25° to 35°, to achieve unidirectional hydrogen flow.

[0022] By limiting the contraction cone angle to 10°–18° and the diffusion cone angle to 5°–10°, a stable and sufficient negative pressure is ensured in the throat section, enabling efficient self-absorption of hydrogen over a wide operating range. At the same time, an anti-backflow cone surface with a cone angle of 25°–35° is set in the hydrogen supply section. The cone surface structure enables unidirectional hydrogen flow, effectively preventing gas backflow and backfire, thus improving the safety and reliability of equipment operation.

[0023] In some embodiments, the inner peripheral walls of the mixing channel and the counter-current channel are provided with a hydrogen embrittlement resistant and corrosion-resistant alloy layer. The hydrogen embrittlement-resistant and corrosion-resistant alloy layer is a polished layer.

[0024] By setting an anti-hydrogen embrittlement and corrosion-resistant alloy layer on the inner wall of the mixing channel and the counter-flushing channel, and setting it as a polished layer, on the one hand, the excellent resistance to hydrogen embrittlement and wet hydrogen corrosion of the alloy material is utilized to extend the service life of the equipment in water-containing and oxygen-containing media and prevent hydrogen embrittlement cracking and leakage; on the other hand, polishing reduces the roughness of the inner wall of the flow channel, reduces the airflow friction resistance and the amount of static electricity generated, and takes into account both durability and flow performance.

[0025] In some embodiments, the bending angle of the hedging channel is 30° to 60°.

[0026] By limiting the bending angle of the counter-flow channel to 30° to 60°, an effective momentum counter-flow is formed when the gas turns and flows back in the arc-shaped channel. This avoids insufficient counter-flow effect and reduced mixing uniformity due to an excessively small angle, while also preventing a sudden increase in airflow resistance and excessive pressure loss due to an excessively large angle. An optimized balance is achieved between mixing effect and overall energy consumption.

[0027] Based on the above technical solution, the present invention has the following beneficial effects compared with the prior art: By setting up an arc-shaped counter-flow channel along the extension direction of the mixing channel, with both its inlet and outlet connected to the mixing channel, when the mixed gas flows through the mixing channel, some gas is diverted from the inlet into the counter-flow channel, turns after the arc path, and flows back from the outlet to the mixing channel, where it counter-flows with the main gas flow in the mixing channel. Through multiple cycles of diversion-return-counter-flow, the momentum exchange and component mixing between gases of different densities are enhanced, thereby significantly improving the mixing uniformity of hydrogen and natural gas, effectively preventing gas stratification and local hydrogen concentration exceeding the standard when a high proportion of hydrogen is added, and reducing the risk of combustion knocking and pipeline corrosion. Attached Figure Description

[0028] Figure 1This is a schematic diagram of the structure of the present invention; Figure 2 This is a full line drawing of the present invention; Figure 3 For the present invention Figure 2 A magnified view of a portion of the image; Figure 4 This is a cross-sectional view of the present invention; Figure 5 For the present invention Figure 4 A magnified view of a portion of the image.

[0029] Explanation of reference numerals in the attached figures: 100. Blending body; 110. Blending channel; 120. Mixing counter-flushing section; 121. Counter-flushing channel; 200. Conductive wire; 300. Preliminary mixing component; 310. Contraction section; 320. Throat section; 330. Diffusion section; 340. Hydrogen supply section. Detailed Implementation

[0030] To facilitate understanding of the present invention, specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0031] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0032] Unless otherwise stated or defined, the term “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0033] It should be noted that in this article, "fixed to" or "connected to" can mean directly fixed to or connected to a component, or indirectly fixed to or connected to a component.

[0034] like Figure 1-5 As shown, the gas mixer provided in this embodiment includes a mixing body 100, and a mixing channel 110 is provided inside the mixing body 100. The mixing channel 110 has an air inlet and an air outlet that connect to the outside of the mixing body 100.

[0035] The mixing body 100 is provided with a mixing counter-junction section 120, and the mixing counter-junction section 120 is provided with at least one section along the extension direction of the mixing channel 110.

[0036] Furthermore, each mixing counter-flushing section 120 includes at least one counter-flushing channel 121, which is arc-shaped along the extension direction of the mixing channel 110. The inlet and outlet of the counter-flushing channel 121 are both connected to the mixing channel 110, so that the mixed gas in the mixing channel 110 is diverted from the inlet to the counter-flushing channel 121 and returns to the mixing channel 110 from the outlet to counter-flushing with the gas in the mixing channel 110.

[0037] In some embodiments, the mixing counter-flushing section 120 includes two sets of counter-flushing units, each set including at least one counter-flushing channel 121. The inlet of the downstream counter-flushing channel 121 is located between the inlet and outlet of the upstream counter-flushing channel 121 in the extension direction of the mixing channel 110. This achieves a multi-stage continuous counter-flushing effect, where after the gas completes one backflow counter-flushing in the upstream counter-flushing channel 121, the not yet fully homogenized gas flow is diverted again into the downstream counter-flushing channel 121 for a second backflow counter-flushing. This further prolongs the separation time of hydrogen from natural gas and improves the overall mixing uniformity and stability.

[0038] In some embodiments, each set of counter-current units includes a plurality of counter-current channels 121 arranged in an array along the circumferential direction of the mixing channel 110. This enables simultaneous diversion and backflow counter-current from multiple circumferential directions of the mixing channel 110, allowing the gas to undergo multi-stage mixing in the axial direction and simultaneously forming multiple interwoven counter-current airflows in the circumferential direction, creating a three-dimensional mixing flow field. This avoids the uneven circumferential mixing caused by unilateral diversion and further improves the consistency of the cross-sectional concentration distribution.

[0039] The mixing counter-flushing section 120 described in this embodiment can be flexibly increased or decreased in number by adjusting the axial length of the blending body 100, depending on the actual design environment and application scenario. For example, in skid-mounted equipment or small distributed hydrogen blending scenarios with high space compactness requirements, the length of the blending body 100 can be shortened, and a single or two-stage mixing counter-flushing section 120 can be used to achieve basic homogeneous mixing in a limited space. In contrast, in scenarios with high flow rates, high proportions of hydrogen blending, or long-distance pipeline transportation where strict requirements for mixing uniformity are placed, the length of the blending body 100 can be extended, and three or more mixing counter-flushing sections 120 can be arranged in series along the extension direction of the blending channel 110. By increasing the number of cycles of gas diversion-return-counter-flushing, the time for hydrogen to separate from natural gas is further extended, ensuring that the outlet concentration remains highly uniform and stable over a wide range of operating conditions.

[0040] In some embodiments, the conductive wires 200 are spirally wound at equal intervals around the outer peripheral wall of the mixing body 100 along the extension direction of the mixing channel 110. This ensures that the outer wall of the mixing body 100 has a uniform electrostatic discharge path throughout its entire circumference and axial length, eliminating the generation of dead zones in electrostatic discharge and further improving the reliability and safety of overall antistatic protection.

[0041] Specifically, the conductive wire 200 needs to be connected to a power source to form an active electrostatic discharge circuit. The power source can be a portable power source or mains power. When connected to a power source, the conductive wire 200 can generate a continuous electromagnetic field or ionization effect on the outer periphery of the mixing body 100, actively neutralizing the static charge generated by airflow friction. Compared with passive grounding discharge, this further improves the response speed and thoroughness of electrostatic discharge, making it particularly suitable for harsh working conditions with high flow rates and high hydrogen doping ratios, ensuring that the equipment maintains reliable explosion-proof safety performance during long-term continuous operation.

[0042] In some embodiments, a preliminary mixing element 300 is also included. The outlet of the preliminary mixing element 300 is connected to the inlet of the mixing channel 110. It is used to perform preliminary mixing on the gas entering the mixing channel 110, thereby reducing the concentration gradient of the two gases when entering the mixing channel 110, reducing the mixing load of the subsequent mixing counter-current section 120, and helping to improve the overall mixing efficiency and outlet concentration stability.

[0043] Furthermore, the preliminary mixing component 300 is a Venturi tube, which includes a contraction section 310, a throat section 320, and a diffuser section 330 connected sequentially along the gas flow direction. The inner peripheral wall of the contraction section 310 gradually contracts inward along the gas transport direction, and the inner peripheral wall of the diffuser section 330 gradually diffuses outward along the gas transport direction. A hydrogen supply section 340 is provided on the side of the mixing body 100, and the hydrogen supply section 340 is connected to the throat section 320. The contraction section 310 and the diffuser section 330 are used to accelerate and diffuse the mainstream of natural gas, and the hydrogen supply section 340 is provided on the side of the throat section 320. The negative pressure formed by the high-speed airflow at the throat section enables the hydrogen to be injected and initially mixed without external pressure boosting equipment, simplifying the system structure, reducing energy consumption and electrical explosion hazards, and is suitable for continuous homogeneous mixing of hydrogen and natural gas with a volume ratio of 5% to 30%.

[0044] Specifically, the contraction cone angle of the contraction section 310 is 10° to 18°; the diffusion cone angle of the diffusion section 330 is 5° to 10°, ensuring that the throat section 320 forms a stable and sufficient negative pressure, thereby achieving efficient self-absorption of hydrogen within a wide operating range.

[0045] Furthermore, an anti-backflow cone surface is provided in the hydrogen supply section 340, with a cone angle of 25° to 35° to achieve unidirectional hydrogen flow. The cone surface structure effectively prevents gas backflow and backfire, thus improving the safety and reliability of the equipment operation.

[0046] In some embodiments, the inner peripheral walls of the mixing channel 110 and the counter-flushing channel 121 are provided with a hydrogen embrittlement-resistant and corrosion-resistant alloy layer. By utilizing the excellent resistance to hydrogen embrittlement and wet hydrogen corrosion of the alloy material, the service life of the equipment in water-containing and oxygen-containing media is extended, and hydrogen embrittlement cracking and leakage are prevented.

[0047] In practical use, the hydrogen embrittlement resistant and corrosion resistant alloy layer is made of Hastelloy C-276, which has the properties of resistance to wet hydrogen, hydrogen embrittlement, and corrosion in trace oxygen-containing media.

[0048] Furthermore, the hydrogen embrittlement-resistant and corrosion-resistant alloy layer is a polished layer. Polishing reduces the roughness of the inner wall of the flow channel, thereby reducing airflow friction resistance and static electricity generation, thus balancing durability and flow performance.

[0049] In some embodiments, the bending angle of the counter-flow channel 121 is 30°~60°, which ensures that the gas forms an effective momentum counter-flow when it turns back in the arc-shaped channel. This avoids insufficient counter-flow effect and reduced mixing uniformity due to too small an angle, and also prevents excessive airflow resistance and excessive pressure loss due to too large an angle, thus achieving an optimized balance between mixing effect and overall energy consumption.

[0050] In practical use, the gas mixer is designed with a pressure of 4.0 MPa, and is suitable for the standard working conditions of hydrogen production from water electrolysis with natural gas blending at pressures of 1.0 MPa to 3.0 MPa. The operating temperature range is -40℃ to 120℃.

[0051] In actual use, the conductive wire 200 is a tin-plated copper-clad steel conductive wire 200, and the overall grounding resistance at the grounding terminal is ≤3.5Ω, which meets the requirements of hydrogen Ex d IIC T4 explosion-proof level.

[0052] In practical use, the sharp angles inside the mixing channel 110 and the counter-current channel 121 can be rounded to reduce airflow resistance and static electricity generation, thereby reducing overall pressure loss.

[0053] In practical use, the blending body 100 is an integrated structure that can be directly connected to the gas pipeline network, and is suitable for hydrogen blending in civil gas, industrial kilns, distributed hydrogen production skids, and large-scale pipeline hydrogen blending scenarios.

[0054] In actual use, a miniature condensate draining port is provided at the lowest position of the mixing body 100, which is connected to the mixing channel 110 through a pipeline to periodically drain wet hydrogen condensate water, so as to avoid liquid corrosion inside the cavity and local hydrogen concentration accumulation.

[0055] In actual use, the air inlet of the mixing channel 110 of the mixing body 100 and the preliminary mixing component 300, as well as the air outlet and the appliance, are sealed with an existing graphite polytetrafluoroethylene composite hydrogen-resistant sealing structure to reduce the risk of hydrogen permeation and leakage.

[0056] In practical use, the outer wall of the mixing body 100 is provided with a thermal insulation protective layer or thermal insulation protective coating, which is suitable for high-altitude and cold outdoor low-temperature environments. It maintains negative pressure self-absorption stability, unchanged mixing performance, and reliable anti-static grounding in a low-temperature environment of -40℃. The thermal insulation protective layer or thermal insulation protective coating can adopt the thermal insulation layer or thermal insulation coating technology commonly used in the prior art.

[0057] The gas mixer provided in this embodiment, compared with the prior art, sets up an arc-shaped counter-flow channel 121 along the extension direction of the mixing channel 110, so that both its inlet and outlet are connected to the mixing channel 110. When the mixed gas flows through the mixing channel 110, part of the gas is diverted from the inlet into the counter-flow channel 121, and after turning through the arc-shaped path, it flows back from the outlet to the mixing channel 110, where it counter-flows with the main gas flow in the mixing channel 110. By utilizing the multiple cycles of diversion-return-counter-flow, the momentum exchange and component mixing between gases of different densities are enhanced, thereby significantly improving the mixing uniformity of hydrogen and natural gas, effectively preventing gas stratification and local hydrogen concentration exceeding the standard when the hydrogen ratio is high, and reducing the risk of combustion knock and pipeline corrosion.

[0058] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A gas mixer, characterized in that, include: Blending main body (100); A mixing channel (110) is provided inside the mixing body (100) and has an air inlet and an air outlet that connect to the outside of the mixing body (100); A mixing counter-current section (120) is provided within the mixing body (100), and at least one section is provided along the extension direction of the mixing channel (110); Each of the mixing counter-flushing sections (120) includes at least one counter-flushing channel (121), which is arc-shaped along the extension direction of the mixing channel (110). The inlet and outlet of the counter-flushing channel (121) are both connected to the mixing channel (110) so that the mixed gas in the mixing channel (110) is diverted from the inlet to the counter-flushing channel (121) and returns to the mixing channel (110) from the outlet to counter-flush the gas in the mixing channel (110).

2. The gas mixer as described in claim 1, characterized in that, The hybrid hedging section (120) includes two sets of hedging units, each set of hedging units including at least one of the hedging channels (121). The inlet of the downstream hedging channel (121) is located between the inlet and outlet of the upstream hedging channel (121) in the direction of extension of the mixing channel (110).

3. The gas mixer as described in claim 2, characterized in that, Each set of hedging units includes a plurality of hedging channels (121) arranged in an array along the circumferential direction of the mixing channel (110).

4. The gas mixer according to any one of claims 1-3, characterized in that, The outer peripheral wall of the mixing body (100) is spirally wound with a conductive wire (200), and both ends of the mixing body (100) are provided with grounding terminals that are electrically connected to the conductive wire (200).

5. The gas mixer as described in claim 4, characterized in that, The conductive wire (200) is spirally wound at equal intervals around the outer peripheral wall of the mixing body (100) along the extension direction of the mixing channel (110).

6. The gas mixer according to any one of claims 1-3, characterized in that, It also includes a preliminary mixing component (300), the outlet of which is connected to the inlet of the mixing channel (110) for preliminary mixing of the gas entering the mixing channel (110).

7. The gas mixer as described in claim 6, characterized in that, The preliminary mixing component (300) is a venturi tube, which includes a converging section (310), a throat section (320) and a diffuser section (330) connected sequentially along the airflow direction. The inner peripheral wall of the contraction section (310) gradually contracts inward along the gas transport direction, and the inner peripheral wall of the diffusion section (330) gradually diffuses outward along the gas transport direction. The side of the mixing body (100) is provided with a hydrogen supply section (340), and the hydrogen supply section (340) is connected to the throat section (320).

8. The gas mixer as described in claim 7, characterized in that, The contraction cone angle of the contraction section (310) is 10° to 18°; The diffusion cone angle of the diffusion section (330) is 5° to 10°; The hydrogen supply section (340) is provided with an anti-backflow cone surface, the cone angle of which is 25° to 35°, so as to realize the unidirectional flow of hydrogen.

9. The gas mixer according to any one of claims 1-3, characterized in that, The inner peripheral walls of the mixing channel (110) and the counter-current channel (121) are provided with a hydrogen embrittlement resistant and corrosion resistant alloy layer; The hydrogen embrittlement-resistant and corrosion-resistant alloy layer is a polished layer.

10. The gas mixer according to any one of claims 1-3, characterized in that, The bending angle of the hedging channel (121) is 30°~60°.

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