Hydrogen mixing device

Abstract

The invention provides a hydrogen mixing device, relates to the technical field of natural gas hydrogen mixing, and aims to improve the mixing effect of natural gas and hydrogen. The hydrogen mixing device comprises a natural gas inlet pipe, a hydrogen inlet pipe, a mixing pipe and a mixing element. The mixing element is arranged in the mixing pipe, the mixing element comprises a first fixing frame and a first blade group, the first fixing frame is provided with a first mixing channel, the first mixing channel is provided with a first mixing inlet and a first mixing outlet, the first blade group is arranged in the first mixing channel, the first blade group comprises a plurality of first blades and a plurality of second blades, the first blade extends along a first direction, one end of the second blade is connected with one end of the first blade far away from the first mixing inlet, the other end extends to the first mixing outlet along a second direction, and the orthographic projection of the first blade on the plane of the second blade is overlapped with at least part of the outline of the second blade; wherein the first direction intersects with the second direction.

Description

Technical Field

[0001] This application relates to the technical field of natural gas hydrogen blending, and particularly to a hydrogen blending device. Background Art

[0002] As a zero-carbon energy source, hydrogen energy relies on large-scale storage and transportation technologies. However, pure hydrogen transportation faces challenges such as hydrogen embrittlement of pipeline materials and high leakage risks. The hydrogen blending device can directly reuse the existing pipeline system by uniformly mixing hydrogen into natural gas at a certain ratio (such as 10%-30%), reducing the single transportation cost by about 30%. However, due to the large physical property differences between hydrogen and natural gas, if the mixing is uneven, stratification will occur, and too high local hydrogen concentration will cause hydrogen corrosion to the pipeline. Currently, most existing hydrogen blending devices have problems such as poor mixing effect and complex structure. Summary of the Invention

[0003] To solve the above technical problems, this application provides a hydrogen blending device for improving the mixing effect of natural gas and hydrogen.

[0004] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0005] The embodiments of this application provide a hydrogen blending device, which includes: a natural gas inlet pipe having a natural gas inlet and a natural gas outlet; a hydrogen inlet pipe communicating with the natural gas inlet pipe; a blending pipe having a blending inlet and a blending outlet, the blending inlet being communicated with the natural gas outlet; a blending element disposed in the blending pipe, the blending element including a first fixed frame and a first blade group, the first fixed frame having a first blending channel with a first mixing inlet and a first mixing outlet, the first blade group being disposed in the first blending channel, the first blade group including a plurality of first blades and a plurality of second blades, the plurality of first blades and the plurality of second blades being spaced apart in the height direction of the first blending channel, the first blades extending along a first direction, one end of a second blade being connected to an end of the first blade away from the first mixing inlet, and the other end extending along a second direction to the first mixing outlet, and the orthographic projection of the first blade on the plane where the second blade is located overlapping at least a part of the contour of the second blade; wherein, the first direction intersects with the second direction.

[0006] According to the hydrogen mixing device of the embodiment of the present application, by arranging a mixing element in the mixing pipe and making the extending directions of the first blade and the second blade intersect, the natural gas and hydrogen flowing out of the natural gas outlet can be divided and redirected by the first blade group when flowing through the mixing element, so that the velocity gradient inside the air flow becomes larger, and then the turbulence intensity can be increased, enabling the hydrogen molecules in the air flow to collide and exchange with other molecules in the natural gas air flow more frequently, thereby accelerating the mixing speed and improving the mixing uniformity, and further being beneficial to improving the mixing effect. And the structure is simple, which is beneficial to reducing the manufacturing cost of the hydrogen mixing device.

[0007] In a possible implementation manner, the mixing element further includes a second fixing frame and a second blade group. The second fixing frame has a second mixing channel, the second mixing channel has a second mixing inlet and a second mixing outlet, the second mixing inlet is communicated with the first mixing inlet, the second blade group is arranged in the second mixing channel, the second blade group includes a plurality of third blades and a plurality of fourth blades, the plurality of third blades and the plurality of fourth blades are arranged at intervals in the height direction of the second mixing channel, the third blades extend along a third direction, one end of the fourth blade is connected to the end of the third blade far from the second mixing inlet, and the other end extends along a fourth direction to the second mixing outlet. The plane where the first blade and the second blade are located intersects with the plane where the third blade and the fourth blade are located. The orthographic projection of the third blade on the plane where the fourth blade is located overlaps at least part of the contour of the fourth blade; wherein, the third direction intersects with the fourth direction.

[0008] In a possible implementation manner, the mixing element further includes a first sealing plate and a second sealing plate. The first sealing plate is arranged on the outer periphery of the first fixing frame, the second sealing plate is arranged on the outer periphery of the second fixing frame, and both the first sealing plate and the second sealing plate are connected to the inner wall of the mixing pipe.

[0009] In a possible implementation manner, a first bending groove is provided at the end of the first blade connected to the second blade. The first bending groove has a first opening, and the first opening faces the first mixing inlet.

[0010] In a possible implementation manner, a second bending groove is provided at the end of the second blade far from the first blade. The second bending groove has a second opening, and the second opening faces away from the first mixing outlet.

[0011] In a possible implementation manner, the blending element further includes a support plate and a plurality of the first vane groups. The first vane groups are arranged at intervals in the length direction of the first blending channel. The support plate is located between two adjacent first vane groups and is connected to the first vane groups.

[0012] In a possible implementation manner, the blending pipe includes a first blending section, a second blending section, and a third blending section that are connected in sequence. In the direction from the first blending section to the third blending section, the cross-sectional area of the first blending section gradually increases, the cross-sectional area of the third blending section gradually decreases. The first blending section is connected to the natural gas inlet pipe, and the blending element is arranged in the second blending section.

[0013] In a possible implementation manner, the hydrogen inlet pipe includes a first connection pipe section, a second connection pipe section, and a third connection pipe section that are connected in sequence. The first connection pipe section is connected to the outer peripheral wall of the natural gas inlet pipe. A hydrogen inlet is provided on the first connection pipe section. The third connection pipe extends in a direction close to the natural gas inlet, and a plurality of hydrogen outlets are provided on the outer peripheral wall of the third connection pipe section.

[0014] In a possible implementation manner, the extending direction of the third connection pipe section is the same as the extending direction of the natural gas inlet pipe.

[0015] In a possible implementation manner, the central axis of the third connection pipe section coincides with the central axis of the natural gas inlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application and, together with the specification, are used to explain the principles of the present application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of a hydrogen blending device provided by some embodiments of the present application;

[0019] Figure 2 Stereogram of a blending element provided by some embodiments of the present application;

[0020] Figure 3 Schematic diagram of a blending element provided by some embodiments of the present application;

[0021] Figure 4Schematic diagram of the blending element provided for other embodiments of the present application.

[0022] Reference numerals:

[0023] 100, hydrogen blending device;

[0024] 1, natural gas inlet pipe; 11, natural gas inlet; 12, natural gas outlet;

[0025] 2, blending pipe; 21, first blending section; 211, blending inlet; 22, second blending section; 23, third blending section; 231, blending outlet;

[0026] 3, blending element; 31, first fixed frame; 311, first blending channel; 312, first mixing inlet; 313, first mixing outlet; 314, first sealing plate; 32, first blade group; 321, first blade; 3211, first bending groove; 3212, first opening; 322, second blade; 3221, second bending groove; 3222, second opening; 33, second fixed frame; 331, second blending channel; 332, second mixing inlet; 333, second mixing outlet; 334, second sealing plate; 34, second blade group; 341, third blade; 342, fourth blade; 35, support plate;

[0027] 4, hydrogen inlet pipe; 41, first connecting pipe section; 411, hydrogen inlet; 42, second connecting pipe section; 43, third connecting pipe section; 431, hydrogen outlet. Detailed implementation manners

[0028] In order to more clearly understand the above objects, features and advantages of the present application, the solutions of the present application will be further described below. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 therefore should not be construed as a limitation to the present invention.

[0030] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, "connected" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that they are connected to each other and the relative positional relationship after connection remains unchanged. In addition, the orientation terms mentioned in the embodiments of the present application, such as "inside", "outside", etc., are only references to the directions of the drawings. Therefore, the orientation terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0031] In the description of the embodiments of the present application, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising such element. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising such element.

[0032] As a zero-carbon energy source, hydrogen energy relies on large-scale storage and transportation technologies. However, pure hydrogen transportation faces challenges such as hydrogen embrittlement of pipeline materials and high leakage risks. The hydrogen blending device can directly reuse the existing pipeline system by uniformly mixing hydrogen into natural gas in a certain proportion (such as 10%-30%), and the single transportation cost can be reduced by about 30%. However, due to the large difference in physical properties between hydrogen and natural gas, if the mixing of hydrogen and natural gas is uneven, stratification will occur, and too high local hydrogen concentration will cause hydrogen corrosion to the pipeline. Currently, most of the existing hydrogen blending devices have problems such as poor mixing effect and complex structure.

[0033] To solve the above technical problems, the present application provides a hydrogen blending device.

[0034] Please refer to Figures 1 - 4 , Figure 1 which is a schematic diagram of the hydrogen blending device provided by some embodiments of the present application, Figure 2 which is a perspective view of the blending element provided by some embodiments of the present application, Figure 3 which is a schematic diagram of the blending element provided by some embodiments of the present application, Figure 4Schematic diagram of a blending element provided for other embodiments of the present application. The hydrogen blending device 100 may include a natural gas inlet pipe 1, a hydrogen inlet pipe 4, a blending pipe 2, and a blending element 3. Among them, the natural gas inlet pipe 1, the hydrogen inlet pipe 4, the blending pipe 2, and the blending element 3 may all be made of stainless steel material, so as to avoid the problem that hydrogen atoms are prone to cause hydrogen-induced failure of carbon steel materials, thereby facilitating the improvement of the safety of the hydrogen blending device 100.

[0035] The natural gas inlet pipe 1 has a natural gas inlet 11 and a natural gas outlet 12. Then, natural gas can flow into the natural gas inlet pipe 1 from the natural gas inlet 11 and then flow out from the natural gas outlet 12.

[0036] Exemplarily, the natural gas inlet 11 and the natural gas outlet 12 may be located at opposite ends in the length direction of the natural gas inlet pipe 1.

[0037] The hydrogen inlet pipe 4 is connected to the natural gas inlet pipe 1. Then, hydrogen can flow into the natural gas inlet pipe 1 through the hydrogen inlet pipe 4.

[0038] The blending pipe 2 may have a blending inlet 211 and a blending outlet 231. Among them, the blending inlet 211 and the blending outlet 231 may be located at opposite ends in the length direction of the blending pipe 2. After flowing into the blending pipe 2 from the blending inlet 211, it can flow out of the blending pipe 2 from the blending outlet 231.

[0039] The blending inlet 211 is connected to the natural gas outlet 12. Among them, the natural gas and hydrogen flowing out of the natural gas outlet 12 can flow into the blending pipe 2 from the blending inlet 211.

[0040] Exemplarily, the connection between the hydrogen inlet pipe 4, the natural gas inlet pipe 1, and the blending pipe 2 may be a detachable connection. For example, the blending pipe 2 and the natural gas inlet pipe 1 may be connected by a flange. Thus, according to different requirements of the blending ratio, the diameters of hydrogen and natural gas pipes can be freely adjusted, and the disassembly and replacement are more convenient.

[0041] The blending element 3 is arranged in the blending pipe 2. Thus, the natural gas and hydrogen flowing into the blending pipe 2 can be mixed after passing through the blending element 3.

[0042] The blending element 3 may include a first fixed frame 31 and a first blade group 32. The first fixed frame 31 is connected to the blending pipe 2. Exemplarily, the first fixed frame 31 may be connected to the blending pipe 2 by welding, bonding, etc.

[0043] The first fixed frame 31 has a first mixing channel 311. The first mixing channel 311 has a first mixing inlet 312 and a first mixing outlet 313. A first blade group 32 can be disposed in the first mixing channel 311. The first blade group 32 includes a plurality of first blades 321 and a plurality of second blades 322. The plurality of first blades 321 and the plurality of second blades 322 are spaced apart in the height direction of the first mixing channel 311. The first blades 321 extend in a first direction, one end of the second blade 322 is connected to the end of the first blade 321 away from the first mixing inlet 312, and the other end extends in a second direction to the first mixing outlet 313. The orthographic projection of the first blade 321 on the plane where the second blade 322 is located overlaps at least a part of the contour of the second blade 322. Wherein, the first direction intersects with the second direction.

[0044] Specifically, the plurality of first blades 321 are spaced apart in the height direction of the first mixing channel 311. In the direction from the first mixing inlet 312 to the first mixing outlet 313, one end of the first blade 321 is disposed at the first mixing inlet 312, and the other end extends in the first direction. The second blade 322 extends in the second direction from the end of the first blade 321 away from the first mixing inlet 312 and extends to the second mixing outlet 333. Then, the first blade 321 and the second blade 322 can form a "V" shape.

[0045] Thus, after the hydrogen and natural gas flowing into the mixing pipe 2 flow through the mixing element 3, the air flow can be divided and redirected by the first blade group 32. This change in direction will increase the velocity gradient inside the air flow, thereby increasing the turbulence intensity, enabling the hydrogen molecules in the air flow to collide and exchange with other molecules in the natural gas air flow more frequently, thus accelerating the mixing speed and improving the mixing uniformity.

[0046] Exemplarily, the first blade group 32 and the first fixed frame 31 can be detachably connected. Among them, the first blade group 32 and the first fixed frame 31 can be detachably connected by means such as fasteners, snap connections, magnetic attraction connections, etc.

[0047] According to the hydrogen mixing device 100 of the embodiment of the present application, by arranging the mixing element 3 in the mixing pipe 2 and making the extending directions of the first blade 321 and the second blade 322 intersect, the natural gas and hydrogen flowing out from the natural gas outlet 12 can be divided and redirected by the first blade group 32 when flowing through the mixing element 3, so that the velocity gradient inside the air flow becomes larger, thereby increasing the turbulence intensity, enabling the hydrogen molecules in the air flow to collide and exchange with other molecules in the natural gas air flow more frequently, thus accelerating the mixing speed and improving the mixing uniformity, and further being beneficial to improving the mixing effect. And the structure is simple, which is beneficial to reducing the manufacturing cost of the hydrogen mixing device 100.

[0048] Please continue to refer to Figures 1 - 4 In some embodiments, the blending element 3 may further include a second fixed frame 33 and a second vane group 34. The second fixed frame 33 has a second blending channel 331, and the second blending channel 331 has a second mixing inlet 332 and a second mixing outlet 333. The second mixing inlet 332 communicates with the first mixing inlet 312. The second vane group 34 is disposed in the second blending channel 331. The second vane group 34 includes a plurality of third vanes 341 and a plurality of fourth vanes 342. The plurality of third vanes 341 and the plurality of fourth vanes 342 are spaced apart in the height direction of the second blending channel 331. The third vanes 341 extend in a third direction, and one end of the fourth vane 342 is connected to the end of the third vane 341 away from the second mixing inlet 332, and the other end extends in a fourth direction to the second mixing outlet 333. The plane where the first vane 321 and the second vane 322 are located intersects the plane where the third vane 341 and the fourth vane 342 are located. The orthographic projection of the third vane 341 on the plane where the fourth vane 342 is located overlaps at least a part of the contour of the fourth vane 342. Among them, the third direction intersects the fourth direction. Thus, the mixed gas of hydrogen and natural gas flowing out from the first mixing outlet 313 can be further divided by the second vane group 34, so that the velocity gradient inside the air flow becomes larger, the turbulence intensity is increased, thereby better accelerating the blending speed and improving the blending uniformity, and further being beneficial to improving the blending effect.

[0049] Exemplarily, the plane where the first vane 321 and the second vane 322 are located may be perpendicular to the plane where the third vane 341 and the fourth vane 342 are located.

[0050] Please continue to refer to Figures 1 - 4 In some embodiments, the blending element 3 may further include a first sealing plate 314 and a second sealing plate 334. The first sealing plate 314 is disposed on the outer periphery of the first fixed frame 31, and the second sealing plate 334 is disposed on the outer periphery of the second fixed frame 33. Both the first sealing plate 314 and the second sealing plate 334 are connected to the inner wall of the blending pipe 2. Specifically, the first sealing plate 314 and the second sealing plate 334 may extend to the inner wall of the blending pipe 2 and then abut against the inner wall of the blending pipe 2, so that the first sealing plate 314 and the second sealing plate 334 can connect the first fixed frame 31 and the second fixed frame 33 to the blending pipe 2. Such a setting has a simple structure, which is beneficial to reducing the manufacturing cost of the hydrogen blending device 100.

[0051] Please continue to refer to Figures 1 - 4, in some embodiments, a first bending groove 3211 is provided at one end of the first blade 321 connected to the second blade 322. The first bending groove 3211 has a first opening 3212, and the first opening 3212 faces the first mixing inlet 312. Thus, the contact area between the airflow and the first blade 321 can be increased, so that the chance of hydrogen molecules being trapped and dispersed can be increased, which is beneficial to further improving the mixing effect.

[0052] Exemplarily, the number of the first bending grooves 3211 can be multiple, and the multiple first bending grooves 3211 can be arranged at intervals in the extending direction of the first blade 321. Thus, the mixing effect can be better improved.

[0053] Please continue to refer to Figures 1 - 4 , in some embodiments, a second bending groove 3221 is provided at one end of the second blade 322 away from the first blade 321. The second bending groove 3221 has a second opening 3222, and the second opening 3222 faces away from the first mixing outlet 313. Thus, the contact area between the airflow and the second blade 322 can be increased, so that the chance of hydrogen molecules being trapped and dispersed can be increased, which is beneficial to further improving the mixing effect.

[0054] It should be noted that the second blade group 34 can also have a structure similar to the first bending groove 3211 and the second bending groove 3221 of the first blade group 32, and details are not described herein again in this application.

[0055] Please continue to refer to Figures 1 - 4 , in some embodiments, the mixing element 3 may further include a support plate 35 and a plurality of first blade groups 32. The first blade groups 32 are arranged at intervals in the length direction of the first mixing channel 311, the support plate 35 is located between two adjacent first blade groups 32 and is connected to the first blade groups 32. Thus, it is beneficial to improve the structural strength of the mixing element 3, and thus beneficial to improve the stability of the mixing element 3.

[0056] It should be noted that the number of the second blade groups 34 can also be multiple, and a support plate 35 can also be arranged between the multiple second blade groups 34, and this application does not limit this.

[0057] Please continue to refer to Figures 1 - 4, in some embodiments, the mixing pipe 2 may include a first mixing section 21, a second mixing section 22, and a third mixing section 23 connected in sequence. In the direction from the first mixing section 21 to the third mixing section 23, the cross-sectional area of the first mixing section 21 gradually increases, and the cross-sectional area of the third mixing section 23 gradually decreases. The first mixing section 21 is connected to the natural gas inlet pipe 1, and the mixing element 3 is disposed in the second mixing section 22. Thus, the velocity of the airflow flowing into the mixing pipe 2 from the mixing inlet 211 can be slowed down, facilitating the mixing element 3 to mix the inflowing airflow. The velocity of the airflow flowing out of the mixing pipe 2 from the mixing outlet 231 can be increased, which is beneficial to improving the transportation efficiency. Moreover, the second mixing section 22 also facilitates the installation of the mixing element 3, thus helping to reduce the assembly difficulty.

[0058] Please continue to refer to Figures 1 - 4 , in some embodiments, the hydrogen inlet pipe 4 may include a first connecting pipe section 41, a second connecting pipe section 42, and a third connecting pipe section 43 connected in sequence. The first connecting pipe section 41 is connected to the outer peripheral wall of the natural gas inlet pipe 1. A hydrogen inlet 411 is provided on the first connecting pipe section 41. The third connecting pipe extends in a direction close to the natural gas inlet. A plurality of hydrogen outlets 431 are provided on the outer peripheral wall of the third connecting pipe section 43. Thus, after being turned by the second connecting pipe section 42, the hydrogen is evenly sprayed into the natural gas inlet pipe 1 from the hydrogen outlets 431 of the third connecting pipe section 43. The natural gas flowing in from the natural gas inlet 11 can be mixed with hydrogen when flowing in, and has more time to mix with hydrogen, so that hydrogen can be pre-mixed with natural gas, which is beneficial to improving the mixing effect.

[0059] Exemplarily, the hydrogen inlet pipe 4 can be formed in an "L" shape. The diameter of the hydrogen outlet 431 can be 10 mm. There are 8 hydrogen outlets 431 evenly distributed on each column in the circumferential direction, and 7 columns are arrayed axially, with a total of 56 hydrogen outlets 431 provided. Hydrogen enters from the hydrogen inlet 411 of the first connecting pipe section 41, is turned by the second connecting pipe section 42, and then is evenly sprayed into the natural gas inlet pipe 1 from the hydrogen outlets 431 of the third connecting pipe section 43 for pre-mixing with natural gas.

[0060] Please continue to refer to Figures 1 - 4 , in some embodiments, the extending direction of the third connecting pipe section 43 is the same as the extending direction of the natural gas inlet pipe 1. Thus, hydrogen can be better pre-mixed with natural gas.

[0061] Please continue to refer to Figures 1 - 4 , in some embodiments, the central axis of the third connecting pipe section 43 coincides with the central axis of the natural gas inlet pipe 1. Thus, the third connecting pipe section 43 can be better assembled, and hydrogen can be better mixed with natural gas, which is beneficial to improving the mixing effect.

[0062] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

[0063] As described above, the specific implementation manners of the present invention are merely provided, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily conceive of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A hydrogen gas blending device, characterized in that The hydrogen gas mixing device includes: A natural gas inlet pipe, which has a natural gas inlet and a natural gas outlet; A hydrogen gas inlet pipe, which is connected to the natural gas inlet pipe; A mixing pipe, which has a mixing inlet and a mixing outlet, and the mixing inlet is connected to the natural gas outlet; A mixing element, which is arranged in the mixing pipe. The mixing element includes a first fixed frame and a first blade group. The first fixed frame has a first mixing channel, the first mixing channel has a first mixing inlet and a first mixing outlet, the first blade group is arranged in the first mixing channel, the first blade group includes a plurality of first blades and a plurality of second blades, the plurality of first blades and the plurality of second blades are arranged at intervals in the height direction of the first mixing channel, the first blades extend along a first direction, one end of the second blade is connected to the end of the first blade far away from the first mixing inlet, and the other end extends along a second direction to the first mixing outlet. The orthographic projection of the first blade on the plane where the second blade is located overlaps at least part of the contour of the second blade; Wherein, the first direction intersects with the second direction.

2. The hydrogen gas blending device according to claim 1, wherein The mixing element further includes a second fixed frame and a second blade group. The second fixed frame has a second mixing channel, the second mixing channel has a second mixing inlet and a second mixing outlet, the second mixing inlet is connected to the first mixing inlet, the second blade group is arranged in the second mixing channel, the second blade group includes a plurality of third blades and a plurality of fourth blades, the plurality of third blades and the plurality of fourth blades are arranged at intervals in the height direction of the second mixing channel, the third blades extend along a third direction, one end of the fourth blade is connected to the end of the third blade far away from the second mixing inlet, and the other end extends along a fourth direction to the second mixing outlet. The plane where the first blade and the second blade are located intersects with the plane where the third blade and the fourth blade are located. The orthographic projection of the third blade on the plane where the fourth blade is located overlaps at least part of the contour of the fourth blade; Wherein, the third direction intersects with the fourth direction.

3. The hydrogen gas blending device according to claim 2, wherein The mixing element further includes a first sealing plate and a second sealing plate. The first sealing plate is arranged on the outer periphery of the first fixed frame, the second sealing plate is arranged on the outer periphery of the second fixed frame, and both the first sealing plate and the second sealing plate are connected to the inner wall of the mixing pipe.

4. The hydrogen gas blending device according to claim 1, characterized in that, One end of the first blade connected to the second blade is provided with a first bending groove, and the first bending groove has a first opening, and the first opening faces the first mixing inlet.

5. The hydrogen gas blending device according to claim 1 or 4, characterized in that One end of the second blade far away from the first blade is provided with a second bending groove, and the second bending groove has a second opening, and the second opening faces away from the first mixing outlet.

6. The hydrogen gas blending device according to claim 1, wherein The blending element further includes a support plate and a plurality of the first blade groups, the first blade groups are arranged at intervals in the length direction of the first blending channel, the support plate is located between two adjacent first blade groups and is connected to the first blade groups.

7. The hydrogen gas blending device according to claim 1, characterized in that, The blending pipe includes a first blending section, a second blending section and a third blending section connected in sequence. In the direction from the first blending section to the third blending section, the cross-sectional area of the first blending section gradually increases, the cross-sectional area of the third blending section gradually decreases, the first blending section is connected to the natural gas inlet pipe, and the blending element is arranged in the second blending section.

8. The hydrogen gas mixing device according to claim 1, wherein The hydrogen inlet pipe includes a first connecting pipe section, a second connecting pipe section and a third connecting pipe section connected in sequence. The first connecting pipe section is connected to the outer peripheral wall of the natural gas inlet pipe. A hydrogen inlet is provided on the first connecting pipe section. The third connecting pipe extends towards the direction close to the natural gas inlet, and a plurality of hydrogen outlets are provided on the outer peripheral wall of the third connecting pipe section.

9. The hydrogen gas blending device according to claim 8, characterized in that, The extending direction of the third connecting pipe section is the same as the extending direction of the natural gas inlet pipe.

10. The hydrogen gas blending device according to claim 8, wherein The central axis of the third connecting pipe section coincides with the central axis of the natural gas inlet pipe.

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