Hydrogen mixing device
By using cross-arranged blade groups and support plate structures in the hydrogen blending device, the problem of uneven mixing of hydrogen and natural gas was solved, achieving a more efficient blending effect and reduced costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEST ENERGY EQUIP TIANJIN
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-08
AI Technical Summary
Existing hydrogen blending devices have poor mixing performance, complex structures, and uneven mixing of hydrogen and natural gas, which may lead to hydrogen corrosion of pipelines. In addition, existing devices are costly.
The mixing element is adopted, including first and second fixed frames and blade groups. The blade groups are arranged crosswise in the mixing tube to increase the airflow velocity gradient and improve the turbulence intensity, thereby accelerating the mixing uniformity of hydrogen and natural gas. The structure is simplified by the support plate and the sealing plate.
It improves the blending effect of hydrogen and natural gas, reduces the manufacturing cost of the device, enhances safety, simplifies the structure, and reduces transportation costs.
Smart Images
Figure CN224207787U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of natural gas hydrogen blending technology, and in particular to a hydrogen blending device. Background Technology
[0002] Hydrogen energy, as a zero-carbon energy source, 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. Hydrogen blending devices, by uniformly mixing hydrogen with natural gas in a specific ratio (e.g., 10%-30%), can directly reuse existing pipeline systems, reducing single-transportation costs by approximately 30%. However, due to the significant differences in physical properties between hydrogen and natural gas, uneven mixing can lead to stratification, and excessively high local hydrogen concentrations can cause hydrogen corrosion of the pipeline. Currently, most existing hydrogen blending devices suffer from poor mixing effects and complex structures. Utility Model Content
[0003] To address the aforementioned technical problems, this application provides a hydrogen blending device for improving the mixing effect of natural gas and hydrogen.
[0004] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:
[0005] This application provides a hydrogen blending device, comprising: 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 communicating with the natural gas outlet; and a blending element disposed within the blending pipe, the blending element comprising a first fixed frame and a first blade group, the first fixed frame having a first blending channel having a first mixing inlet and a first mixing outlet, the first blade group being disposed within the first blending channel, the first blade group comprising 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 the second blades being connected to the end of the first blades away from the first mixing inlet, and the other end extending along a second direction to the first mixing outlet, the orthographic projection of the first blades on the plane where the second blades are located overlapping at least a portion of the outline of the second blades; wherein, the first direction intersects the second direction.
[0006] According to the hydrogen blending device of this application embodiment, by arranging a blending element inside the blending tube and making the extension directions of the first blade and the second blade intersect, the natural gas and hydrogen flowing out of the natural gas outlet can be separated and have their directions changed by the first blade group when flowing through the blending element. This increases the velocity gradient inside the gas flow, thereby increasing the turbulence intensity. This allows hydrogen molecules in the gas flow to collide and exchange with other molecules in the natural gas flow more frequently, thereby accelerating the blending speed and improving the blending uniformity, which in turn helps to improve the blending effect. Furthermore, the structure is simple, which helps to reduce the manufacturing cost of the hydrogen blending device.
[0007] In one possible implementation, the mixing element further includes a second fixed frame and a second blade group. The second fixed frame has a second mixing channel with a second mixing inlet and a second mixing outlet. The second mixing inlet communicates with the first mixing inlet. The second blade group is disposed within the second mixing channel and includes a plurality of third blades and a plurality of fourth blades. The plurality of third blades and the plurality of fourth blades are spaced apart in the height direction of the second mixing channel. The third blades extend along a third direction. One end of each fourth blade is connected to the end of the third blade away from the second mixing inlet, and the other end extends along a fourth direction to the second mixing outlet. The plane containing the first and second blades intersects the plane containing the third and fourth blades. The orthographic projection of the third blade onto the plane containing the fourth blade overlaps with at least a portion of the outline of the fourth blade. The third direction intersects the fourth direction.
[0008] In one possible implementation, the mixing element further includes a first sealing plate and a second sealing plate, the first sealing plate being disposed on the outer periphery of the first fixing frame and the second sealing plate being disposed on the outer periphery of the second fixing frame, both the first sealing plate and the second sealing plate being connected to the inner wall of the mixing tube.
[0009] In one possible implementation, the end of the first blade connected to the second blade is provided with a first bending groove, the first bending groove having a first opening, the first opening being directly opposite the first mixing inlet.
[0010] In one possible implementation, the end of the second blade away from the first blade is provided with a second bending groove, the second bending groove having a second opening opposite to the first mixing outlet.
[0011] In one possible implementation, the mixing element further includes a support plate and a plurality of first blade groups, the first blade groups being spaced apart along the length of the first mixing channel, the support plate being located between two adjacent first blade groups and connected to the first blade groups.
[0012] In one possible implementation, 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, and 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 disposed in the second blending section.
[0013] In one possible implementation, 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 and has a hydrogen inlet. The third connecting pipe section extends toward the natural gas inlet and has multiple hydrogen outlets on its outer peripheral wall.
[0014] In one possible implementation, the third connecting pipe section extends in the same direction as the natural gas inlet pipe.
[0015] In one possible implementation, the central axis of the third connecting pipe section coincides with the central axis of the natural gas inlet pipe. Attached Figure Description
[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0017] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.
[0018] Figure 1 Schematic diagram of a hydrogen blending apparatus provided in some embodiments of this application;
[0019] Figure 2 A perspective view of the mixing element provided in some embodiments of this application;
[0020] Figure 3 A schematic diagram of the mixing element provided in some embodiments of this application;
[0021] Figure 4This is a schematic diagram of a mixing element provided in some other embodiments of this application.
[0022] Figure label:
[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 assembly; 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 assembly; 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
[0028] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0030] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, "linking" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after the connection. Furthermore, the directional terms mentioned in the embodiments of this application, such as "inner" and "outer," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0031] In the description of embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements possessed by such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0032] Hydrogen energy, as a zero-carbon energy source, 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. Hydrogen blending devices, by uniformly mixing hydrogen with natural gas in a specific ratio (e.g., 10%-30%), can directly reuse existing pipeline systems, reducing single-transportation costs by approximately 30%. However, due to the significant differences in physical properties between hydrogen and natural gas, uneven mixing can lead to stratification, and excessively high local hydrogen concentrations can cause hydrogen corrosion of the pipeline. Currently, most existing hydrogen blending devices suffer from poor mixing effects and complex structures.
[0033] To solve the above-mentioned technical problems, this application provides a hydrogen blending device.
[0034] Please see Figures 1-4 , Figure 1 This is a schematic diagram of a hydrogen blending apparatus provided in some embodiments of this application. Figure 2 This is a perspective view of the mixing element provided in some embodiments of this application. Figure 3 This is a schematic diagram of the mixing element provided in some embodiments of this application. Figure 4This is a schematic diagram of the blending element provided in some other embodiments of this 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. 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, which avoids the problem of hydrogen atoms easily causing hydrogen-induced failure of carbon steel materials, thereby improving 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. 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] For example, the natural gas inlet 11 and the natural gas outlet 12 can be located at opposite ends of the natural gas inlet pipe 1 along its length.
[0037] If 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 mixing pipe 2 may have a mixing inlet 211 and a mixing outlet 231. The mixing inlet 211 and the mixing outlet 231 may be located at opposite ends along the length of the mixing pipe 2. After flowing into the mixing pipe 2 through the mixing inlet 211, the mixture can flow out of the mixing pipe 2 through the mixing outlet 231.
[0039] The blending inlet 211 is connected to the natural gas outlet 12. Natural gas and hydrogen flowing out of the natural gas outlet 12 can flow into the blending pipe 2 through the blending inlet 211.
[0040] For example, the connection between the hydrogen inlet pipe 4, the natural gas inlet pipe 1, and the blending pipe 2 can be detachable. For instance, the blending pipe 2 and the natural gas inlet pipe 1 can be connected via a flange. This allows for flexible adjustment of the hydrogen and natural gas pipe diameters according to different blending ratio requirements, and makes disassembly and replacement more convenient.
[0041] The mixing element 3 is installed inside the mixing pipe 2. Thus, the natural gas and hydrogen flowing into the mixing pipe 2 can be mixed after passing through the mixing element 3.
[0042] The mixing element 3 may include a first fixing frame 31 and a first blade assembly 32. The first fixing frame 31 is connected to the mixing tube 2. For example, the first fixing frame 31 may be connected to the mixing tube 2 by welding, bonding, or other methods.
[0043] A 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 may be disposed within 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 along a first direction, and 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 along a second direction to the first mixing outlet 313. The orthographic projection of the first blade 321 onto the plane where the second blade 322 is located overlaps with at least a portion of the outline of the second blade 322. The first direction intersects the second direction.
[0044] Specifically, multiple 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 located at the first mixing inlet 312, and the other end extends along the first direction. The second blade 322 extends from the end of the first blade 321 away from the first mixing inlet 312 along the second direction and extends to the second mixing outlet 333. Thus, the first blade 321 and the second blade 322 can be formed into a "V" shape.
[0045] Therefore, after the hydrogen and natural gas flowing into the mixing pipe 2 pass through the mixing element 3, the airflow can be divided and its direction changed by the first blade group 32. This change in direction will increase the velocity gradient inside the airflow, thereby increasing the turbulence intensity. This allows the hydrogen molecules in the airflow to collide and exchange with other molecules in the natural gas airflow more frequently, thereby accelerating the mixing speed and improving the mixing uniformity.
[0046] For example, the first blade assembly 32 and the first fixing frame 31 can be detachably connected. Specifically, the detachable connection between the first blade assembly 32 and the first fixing frame 31 can be achieved through fasteners, snap-fit connections, magnetic connections, or other methods.
[0047] According to the hydrogen blending device 100 of this application embodiment, by providing a blending element 3 inside the blending tube 2 and making the extending directions of the first blade 321 and the second blade 322 intersect, the natural gas and hydrogen flowing out of the natural gas outlet 12 can be separated and have their directions changed by the first blade group 32 when flowing through the blending element 3. This increases the velocity gradient inside the gas flow, thereby increasing the turbulence intensity. This allows hydrogen molecules in the gas flow to collide and exchange with other molecules in the natural gas flow more frequently, thereby accelerating the blending speed and improving the blending uniformity, which in turn helps to improve the blending effect. Furthermore, the structure is simple, which helps to reduce the manufacturing cost of the hydrogen blending device 100.
[0048] Please continue reading. Figures 1-4 In some embodiments, the mixing element 3 may further include a second fixing frame 33 and a second blade group 34. The second fixing frame 33 has a second mixing channel 331, which 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 blade group 34 is disposed within the second mixing channel 331 and includes a plurality of third blades 341 and a plurality of fourth blades 342. The plurality of third blades 341 and the plurality of fourth blades 342 are spaced apart in the height direction of the second mixing channel 331. The third blades 341 extend in a third direction, and one end of the fourth blade 342 is connected to the end of the third blade 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 containing the first blade 321 and the second blade 322 intersects the plane containing the third blade 341 and the fourth blade 342. The orthographic projection of the third blade 341 onto the plane containing the fourth blade 342 overlaps with at least a portion of the outline of the fourth blade 342. The third direction intersects with the fourth direction. Therefore, the second blade group 34 can further separate the hydrogen and natural gas mixture flowing from the first mixing outlet 313, increasing the velocity gradient within the gas flow and enhancing turbulence intensity. This, in turn, accelerates the mixing speed and improves the mixing uniformity, thereby improving the mixing effect.
[0049] For example, the plane containing the first blade 321 and the second blade 322 may be perpendicular to the plane containing the third blade 341 and the fourth blade 342.
[0050] Please continue reading. 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 tube 2. Specifically, the first sealing plate 314 and the second sealing plate 334 may extend to the inner wall of the blending tube 2 and then abut against the inner wall of the blending tube 2, so that the first sealing plate 314 and the second sealing frame 334 can connect the first fixed frame 31 and the second fixed frame 33 to the blending tube 2. This arrangement has a simple structure, which helps to reduce the manufacturing cost of the hydrogen blending device 100.
[0051] Please continue reading. Figures 1-4In some embodiments, the end of the first blade 321 connected to the second blade 322 is provided with a first bending groove 3211. The first bending groove 3211 has a first opening 3212, which is directly opposite to the first mixing inlet 312. This increases the contact area between the airflow and the first blade 321, thereby increasing the chance of hydrogen molecules being captured and dispersed, which is beneficial to further improving the mixing effect.
[0052] For example, there can be multiple first bending grooves 3211, and these multiple first bending grooves 3211 can be spaced apart in the extending direction of the first blade 321. This can improve the mixing effect.
[0053] Please continue reading. Figures 1-4 In some embodiments, the end of the second blade 322 furthest from the first blade 321 is provided with a second bending groove 3221. The second bending groove 3221 has a second opening 3222, which is opposite to the first mixing outlet 313. This increases the contact area between the airflow and the second blade 322, thereby increasing the chance of hydrogen molecules being captured and dispersed, which is beneficial to further improving the mixing effect.
[0054] It should be noted that the second blade group 34 may also have a structure with a first bending groove 3211 and a second bending groove 3221 similar to the first blade group 32, which will not be described in detail here.
[0055] Please continue reading. 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 spaced apart along the length of the first mixing channel 311, and the support plate 35 is located between two adjacent first blade groups 32 and connected to the first blade groups 32. This is beneficial to improving the structural strength of the mixing element 3, thereby improving the stability of the mixing element 3.
[0056] It should be noted that there can be multiple second blade groups 34, and support plates 35 can be provided between multiple second blade groups 34. This application does not limit this.
[0057] Please continue reading. 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. Also, the second mixing section 22 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 segment 41, a second connecting pipe segment 42, and a third connecting pipe segment 43 connected in sequence. The first connecting pipe segment 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 segment 41. The third connecting pipe extends towards the 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 segment 43. Thus, after being turned by the second connecting pipe segment 42, the hydrogen is evenly sprayed and flows into the natural gas inlet pipe 1 from the hydrogen outlets 431 of the third connecting pipe segment 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 may be formed into an "L" shape. The diameter of the hydrogen outlet 431 may 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 segment 41, and after being turned by the second connecting pipe segment 42, it is evenly sprayed and flows into the natural gas inlet pipe 1 from the hydrogen outlets 431 of the third connecting pipe segment 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 segment 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 segment 43 coincides with the central axis of the natural gas inlet pipe 1. Thus, the third connecting pipe segment 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 suitable manner in one or more embodiments or examples.
[0063] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A hydrogen blending device, characterized in that, The hydrogen blending device includes: A natural gas inlet pipe, wherein the natural gas inlet pipe has a natural gas inlet and a natural gas outlet; A hydrogen inlet pipe, which is connected to the natural gas inlet pipe; A blending pipe having a blending inlet and a blending outlet, the blending inlet being connected to the natural gas outlet; A mixing element is disposed within a mixing tube. The mixing element includes a first fixed frame and a first blade group. The first fixed frame has a first mixing channel, which has a first mixing inlet and a first mixing outlet. The first blade group is disposed within the first mixing channel and includes a plurality of first blades and a plurality of second blades. The plurality of first blades and the plurality of second blades are spaced apart in the height direction of the first mixing channel. The first blades extend along a first direction. One end of each second blade is connected to the end of the first blade 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 onto the plane where the second blade is located overlaps with at least a portion of the outline of the second blade. Wherein, the first direction intersects with the second direction.
2. The hydrogen blending device according to claim 1, characterized in that, 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 disposed 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 spaced apart in the height direction of the second mixing channel. The third blades extend in a third direction. One end of the fourth blade is connected to the end of the third blade away from the second mixing inlet, and the other end extends in a fourth direction to the second mixing outlet. The plane where the first blade and the second blade are located intersects 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 with at least a portion of the outline of the fourth blade. The third direction intersects with the fourth direction.
3. The hydrogen blending device according to claim 2, characterized in that, The mixing element further includes a first sealing plate and a second sealing plate. The first sealing plate is disposed on the outer periphery of the first fixed frame, and the second sealing plate is disposed on the outer periphery of the second fixed frame. Both the first sealing plate and the second sealing plate are connected to the inner wall of the mixing tube.
4. The hydrogen blending device according to claim 1, characterized in that, The first blade has a first bending groove at the end connected to the second blade, and the first bending groove has a first opening, which is directly opposite the first mixing inlet.
5. The hydrogen blending device according to claim 1 or 4, characterized in that, The second blade has a second bending groove at the end away from the first blade, and the second bending groove has a second opening that is opposite to the first mixing outlet.
6. The hydrogen blending device according to claim 1, characterized in that, The mixing element further includes a support plate and a plurality of first blade groups, the first blade groups being spaced apart along the length of the first mixing channel, the support plate being located between two adjacent first blade groups and connected to the first blade groups.
7. The hydrogen 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, and 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 disposed in the second blending section.
8. The hydrogen blending device according to claim 1, characterized in that, 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 and has a hydrogen inlet. The third connecting pipe section extends towards the natural gas inlet and has multiple hydrogen outlets on its outer peripheral wall.
9. The hydrogen blending device according to claim 8, characterized in that, The third connecting pipe section extends in the same direction as the natural gas inlet pipe.
10. The hydrogen blending device according to claim 8, characterized in that, The central axis of the third connecting pipe section coincides with the central axis of the natural gas inlet pipe.