Blending device and blending method

Abstract

The invention provides a mixing device and a mixing method.The mixing device comprises a premixing module and a mixing module, the premixing module is used for premixing hydrogen and natural gas to obtain hydrogen and natural gas premixed gas; and the mixing module is used for mixing the hydrogen and natural gas premixed gas to obtain a hydrogen and natural gas uniform mixed gas. According to the technical scheme, good pre-mixing can be conducted in the hydrogen injection stage in a stepped pre-mixing mode, hydrogen is injected in the full-cross-section range, and good pre-mixing of hydrogen and natural gas is achieved in the pre-mixing stage; by adopting the perforated baffle plate assembly, the jet flow is increased while the fluid generates such motions as rotation, segmentation, turning and convergence, and the jet flow and the turning direction are coupled, so that the fluid is more uniformly mixed. Compared with the prior art, the mixing effect of natural gas and hydrogen can be effectively improved, and meanwhile flow loss is reduced.

Description

Technical Field

[0001] The present application relates to the field of blending technology, and in particular to a blending device and a blending method. Background Art

[0002] In the context of the increasingly severe energy crisis, hydrogen energy is a flexible energy carrier that helps various energy-using sectors such as electricity, heating, transportation and industrial sectors integrate renewable energy. It is regarded as the clean energy with the greatest development potential in the 21st century and will play an important role in future energy supply. In the context of achieving the dual carbon goals, the use of hydrogen-blended natural gas is of great significance. Hydrogen-blended natural gas technology can not only realize the large-scale storage of hydrogen energy, but also transport hydrogen efficiently and at low cost, realizing "hydrogen into thousands of homes". It is an effective way to reduce the carbon emission intensity of the natural gas utilization process and ensure the safety of gas supply. Through wind / photovoltaic hydrogen production, wind energy and light energy are converted into stable and reliable hydrogen energy, and hydrogen is mixed into the natural gas pipeline in a certain proportion. Hydrogen is transported to end users through the natural gas pipeline network. This is one of the effective ways to help hydrogen use and realize large-scale use of hydrogen energy at this stage.

[0003] However, during the transportation of hydrogen-blended natural gas through pipelines, the uniformity of hydrogen blending is crucial. Uneven blending can easily lead to hydrogen embrittlement in local high hydrogen concentration areas, forming tiny cracks inside the steel and causing leakage accidents. The higher the hydrogen concentration, the greater the probability of hydrogen embrittlement. In addition, hydrogen flames spread quickly and are very easy to burn. Uneven blending can also cause deflagration and tempering to downstream users, which may create the risk of explosion and seriously threaten people's lives and property.

[0004] In the process of blending hydrogen and natural gas, traditional SMX type static mixers are usually used to achieve uniform mixing of hydrogen and natural gas, which has problems such as low blending uniformity, complex structure, and difficult processing. Summary of the invention

[0005] The present application provides a mixing device and a mixing method for obtaining better mixing performance while reducing flow loss.

[0006] In a first aspect, a blending device is provided, comprising: a premixing module and a blending module, wherein:

[0007] The premixing module is used to premix hydrogen and natural gas to obtain hydrogen-natural gas premixed gas;

[0008] The blending module is used to blend the hydrogen-natural gas premixed gas to obtain a uniform hydrogen-natural gas mixed gas.

[0009] In the above technical scheme, a premixing module and a blending module are provided, wherein the premixing module is used to premix hydrogen and natural gas to obtain a hydrogen-natural gas premixed gas; the blending module is used to blend the hydrogen-natural gas premixed gas to obtain a uniform hydrogen-natural gas mixture; the step premixing method is used to perform good premixing in the hydrogen injection stage, so that hydrogen can be injected over the entire cross-sectional area, and hydrogen and natural gas are well premixed in the premixing stage; the perforated baffle assembly is used to increase the jet while causing the fluid to rotate, split, change direction, and merge, and couple the jet with the steering phase to promote more uniform fluid mixing; the staggered arrangement of the blending units promotes the fluid to produce a rotational motion, increases the rotational dimension in the flow direction and radial dimensions, and promotes uniform fluid mixing in three dimensions; compared with the existing SMX blender, the blending uniformity is improved by 5.6%; and the pipeline blockage is reduced, the flow loss is reduced, and the flow resistance loss is reduced by 8.2%.

[0010] In a specific embodiment, the premixing module includes an injection chamber and a plurality of jet chambers, wherein:

[0011] The jet cavities are sequentially arranged inside the injection chamber, and each of the jet cavities is distributed in a stepped manner and arranged in a staggered manner in the fluid flow direction of the injection chamber, so as to perform stepped injection and premixing of hydrogen within the entire cross-section.

[0012] In a specific implementation manner, the jet cavity is provided with a jet hole for jet injection of hydrogen.

[0013] In a specific embodiment, the premixing module further comprises a hydrogen inlet and a natural gas inlet, wherein:

[0014] The natural gas inlet is arranged in a direction parallel to the central axis of the injection chamber;

[0015] The hydrogen inlet is disposed in a direction perpendicular to a central axis of the injection chamber.

[0016] In a specific embodiment, the hydrogen inlet is connected to the injection chamber, and each of the jet chambers is connected to the injection chamber respectively;

[0017] The natural gas inlet is communicated with each of the jet chambers.

[0018] In a specific embodiment, the blending module includes a first blending unit, wherein:

[0019] The first blending unit is used to perform flow direction blending and radial blending on the hydrogen-natural gas premixed gas to obtain a hydrogen-natural gas mixed gas.

[0020] In a specific embodiment, the blending module further comprises a second blending unit, wherein:

[0021] The second blending unit is used to further blend the hydrogen-natural gas mixture in the flow direction and radial direction, and to blend it in the circumferential direction at the same time, so as to obtain the uniform hydrogen-natural gas mixture.

[0022] In a specific embodiment, the first blending unit includes a perforated baffle assembly, wherein:

[0023] The perforated baffle assembly is used for performing flow direction mixing and radial mixing on the hydrogen and natural gas premixed gas.

[0024] In a specific embodiment, the second blending unit is arranged at an angle staggered with the first blending unit, so as to further blend the hydrogen-natural gas mixture in the flow direction and radial direction, and simultaneously perform circumferential blending.

[0025] In a second aspect, a blending method is provided, comprising the following steps:

[0026] Premixing hydrogen and natural gas by using a premixing module to obtain hydrogen-natural gas premixed gas;

[0027] The hydrogen-natural gas premixed gas is mixed with the mixing module to obtain a uniform hydrogen-natural gas mixed gas, wherein:

[0028] include:

[0029] Using a first blending unit, the hydrogen-natural gas premixed gas is subjected to flow blending and radial blending to obtain a hydrogen-natural gas mixed gas;

[0030] The hydrogen-natural gas mixture is further mixed in the flow direction and radial direction by using the second mixing unit, and is mixed in the circumferential direction at the same time, so as to obtain the hydrogen-natural gas uniform mixture.

[0031] In the above technical scheme, a premixing module and a blending module are provided, wherein the premixing module is used to premix hydrogen and natural gas to obtain a hydrogen-natural gas premixed gas; the blending module is used to blend the hydrogen-natural gas premixed gas to obtain a uniform hydrogen-natural gas mixture; the step premixing method is used to perform good premixing in the hydrogen injection stage, so that hydrogen can be injected over the entire cross-sectional area, and hydrogen and natural gas are well premixed in the premixing stage; the perforated baffle assembly is used to increase the jet while causing the fluid to rotate, split, change direction, and merge, and couple the jet with the steering phase to promote more uniform fluid mixing; the staggered arrangement of the blending units promotes the fluid to produce a rotational motion, increases the rotational dimension in the flow direction and radial dimensions, and promotes uniform fluid mixing in three dimensions; compared with the existing SMX blender, the blending uniformity is improved by 5.6%; and the pipeline blockage is reduced, the flow loss is reduced, and the flow resistance loss is reduced by 8.2%. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a mixing device provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the structure of a premixing module provided in an embodiment of the present application; (a) is a left side view, and (b) is a stereogram;

[0034] Figure 3 A schematic diagram of the structure of a first blending unit provided in an embodiment of the present application; (a) is a main view, and (b) is an AA cross-sectional view;

[0035] Figure 4 A schematic diagram of the structure of a second blending unit provided in an embodiment of the present application; (a) is a main view, and (b) is a BB cross-sectional view;

[0036] Figure 5 A flowchart of a blending method provided in an embodiment of the present application;

[0037] Figure 6 A structural block diagram of a mixing device provided in an embodiment of the present application;

[0038] Figure 7 A schematic diagram of the blending process provided in the embodiment of the present application;

[0039] Figure 8 A schematic diagram of the mixing effect provided in an embodiment of the present application.

[0040] Among them, 1-premixing module, 2-injection chamber, 3-jet chamber, 4-hydrogen inlet, 5-natural gas inlet, 6-jet hole, 7-first mixing unit, 8-second mixing unit, 9-baffle, 10-flow hole. DETAILED DESCRIPTION

[0041] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0042] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0043] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0044] To facilitate understanding of the blending device and blending method provided in the embodiment of the present application, its application scenario is first explained. The blending device and blending method provided in the embodiment of the present application are used to reduce flow loss while obtaining better blending performance. In the process of hydrogen-blended natural gas pipeline transportation, the uniformity of hydrogen blending is crucial. Uneven blending can easily lead to hydrogen embrittlement in local high hydrogen concentration areas, forming fine cracks inside the steel, and leakage accidents. The higher the hydrogen concentration, the greater the probability of hydrogen embrittlement. In addition, the hydrogen flame propagates quickly and is very easy to burn. Uneven blending can also cause downstream users to produce deflagration, tempering and other phenomena, which may cause the risk of explosion and seriously threaten people's life and property safety. In the process of blending hydrogen and natural gas, traditional SMX-type static mixers are usually used to achieve uniform mixing of hydrogen and natural gas, which has problems such as low blending uniformity, complex structure, and high processing difficulty. For this reason, the embodiment of the present application provides a blending device and blending method to reduce flow loss while obtaining better blending performance. The following is a detailed description of the embodiment in conjunction with specific drawings.

[0045] refer to Figures 1 to 8 , Figure 1 A schematic diagram of the structure of a mixing device provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a premixing module provided in an embodiment of the present application; (a) is a left side view, and (b) is a stereogram; Figure 3 A schematic diagram of the structure of a first blending unit provided in an embodiment of the present application; (a) is a main view, and (b) is an AA cross-sectional view; Figure 4 A schematic diagram of the structure of a second blending unit provided in an embodiment of the present application; (a) is a main view, and (b) is a BB cross-sectional view; Figure 5 A flowchart of a blending method provided in an embodiment of the present application; Figure 6 A structural block diagram of a mixing device provided in an embodiment of the present application; Figure 7 A schematic diagram of the blending process provided in the embodiment of the present application; Figure 8A schematic diagram of the mixing effect provided in an embodiment of the present application.

[0046] exist Figure 1 In the embodiment of the present application, a blending device is provided, comprising: a premixing module 1 and a blending module, wherein:

[0047] The premixing module is used to premix hydrogen and natural gas to obtain hydrogen-natural gas premixed gas;

[0048] The blending module is used to blend the hydrogen-natural gas premixed gas to obtain a uniform hydrogen-natural gas mixed gas.

[0049] In the above technical scheme, a premixing module and a blending module are provided, wherein the premixing module is used to premix hydrogen and natural gas to obtain a hydrogen-natural gas premixed gas; the blending module is used to blend the hydrogen-natural gas premixed gas to obtain a uniform hydrogen-natural gas mixture; the step premixing method is used to perform good premixing in the hydrogen injection stage, so that hydrogen can be injected over the entire cross-sectional area, and hydrogen and natural gas are well premixed in the premixing stage; the perforated baffle assembly is used to increase the jet while causing the fluid to rotate, split, change direction, and merge, and couple the jet with the steering phase to promote more uniform fluid mixing; the staggered arrangement of the blending units promotes the fluid to produce a rotational motion, increases the rotational dimension in the flow direction and radial dimensions, and promotes uniform fluid mixing in three dimensions; compared with the existing SMX blender, the blending uniformity is improved by 5.6%; and the pipeline blockage is reduced, the flow loss is reduced, and the flow resistance loss is reduced by 8.2%.

[0050] In a specific embodiment, the premixing module includes an injection chamber 2 and a plurality of jet chambers 3, wherein:

[0051] The jet cavities are sequentially arranged inside the injection chamber, and each of the jet cavities is distributed in a stepped manner and arranged in a staggered manner in the fluid flow direction of the injection chamber, so as to perform stepped injection and premixing of hydrogen within the entire cross-section.

[0052] Specifically, there are three jet cavities, and the three jet cavities are arranged in a step-like manner along the flow direction; the three jet cavities are arranged in a 120° staggered manner.

[0053] In a specific implementation manner, the jet cavity is provided with a jet hole 6 for jet injection of hydrogen.

[0054] In a specific embodiment, the premixing module further comprises a hydrogen inlet 4 and a natural gas inlet 5, wherein:

[0055] The natural gas inlet is arranged in a direction parallel to the central axis of the injection chamber;

[0056] The hydrogen inlet is disposed in a direction perpendicular to a central axis of the injection chamber.

[0057] In a specific embodiment, the hydrogen inlet is connected to the injection chamber, and each of the jet chambers is connected to the injection chamber respectively;

[0058] The natural gas inlet is communicated with each of the jet chambers.

[0059] In a specific embodiment, the blending module includes a first blending unit 7, wherein:

[0060] The first blending unit is used to perform flow direction blending and radial blending on the hydrogen-natural gas premixed gas to obtain a hydrogen-natural gas mixed gas.

[0061] In a specific embodiment, the blending module further comprises a second blending unit 8, wherein:

[0062] The second blending unit is used to further blend the hydrogen-natural gas mixture in the flow direction and radial direction, and to blend it in the circumferential direction at the same time, so as to obtain the uniform hydrogen-natural gas mixture.

[0063] In a specific embodiment, the first blending unit includes a perforated baffle assembly, wherein:

[0064] The perforated baffle assembly is used for performing flow direction mixing and radial mixing on the hydrogen and natural gas premixed gas.

[0065] Specifically, the perforated baffle assembly includes a plurality of baffles 9, and the baffles are provided with flow holes 10. The baffles are in an "X" shape, and the baffles are arranged at 90 degrees to each other, and each baffle is at 45 degrees to the axis of the pipeline flow direction. When the fluid passes through the first mixing unit, a part of the fluid is divided by the baffles, causing the fluid to rotate, divide, change direction, and merge, thereby promoting uniform mixing of the fluid; the other part of the fluid flows through the flow holes of the baffles, and this part of the fluid forms a jet, which is further mixed with the fluid diverted by the baffles, thereby improving the uniformity of mixing.

[0066] In a specific implementation manner, the second blending unit is arranged at an angle staggered with the first blending unit, and is used to further blend the hydrogen-natural gas mixture in the flow direction and radial direction, and simultaneously perform circumferential blending.

[0067] Specifically, the second mixing unit and the first mixing unit are staggered at 90 degrees. This arrangement can induce the fluid to generate rotational motion, further increase the rotation dimension in the flow direction mixing dimension, and promote uniform mixing of the fluid in the three dimensions of flow direction, radial direction and rotation.

[0068] In a specific embodiment, the design process of the blending device is:

[0069] refer to Figure 1 First, the step premixing method is used to inject hydrogen into the entire cross-section to facilitate mixing in the mixing unit. After premixing, hydrogen and natural gas enter the first mixing unit, where the baffle plate causes the fluid to split, turn, merge, and combine with the jet to promote uniform mixing of the fluid. After passing through the first mixing unit, the fluid enters the second mixing unit downstream. The second mixing unit is staggered at 90° with the first mixing unit, further increasing the rotation dimension in the flow mixing dimension, promoting uniform mixing of the fluid in the three dimensions of flow direction, radial direction, and rotation.

[0070] Based on the gas transmission flow rates of natural gas and hydrogen, as well as the blending ratio range of natural gas and hydrogen, the diameters and speeds of the natural gas inlet pipeline and the hydrogen inlet pipeline are calculated. During the specific implementation, flow meters and pressure gauges are set up for real-time detection to ensure the blending effect.

[0071] Q 天然气 =πr 天然气 2 v 天然气 ;

[0072] Q 氢气 =πr 氢气 2 v 氢气 ;

[0073] Where: Q 天然气 is the natural gas flow rate, r 天然气 is the radius of the natural gas pipeline, v 天然气 is the natural gas flow rate, Q 氢气 is the hydrogen flow rate, r 氢气 is the radius of the hydrogen pipeline, v 氢气 is the hydrogen flow rate.

[0074] In this embodiment, based on the gas transmission capacity of the hydrogen-blended pipeline of about 1×10 4 m 3 / h, the speed of the mixer generally does not exceed 15m / s, the hydrogen blending volume ratio is selected to be 15%, it is assumed that the inlet velocity of hydrogen is twice that of natural gas, and the diameter of the natural gas pipeline is 500mm.

[0075] refer to Figure 2, based on parameters such as natural gas pipe diameter, hydrogen blending volume ratio, and hydrogen flow rate, a hydrogen step injection premixing module is designed. First, a hydrogen injection chamber is designed with an outer diameter of 660mm and an inner diameter of 500mm. Three jet cavities are evenly arranged in a stepped distribution and staggered at 120°. Hydrogen is injected from the injection chamber to the jet chamber through the jet hole of the jet chamber. The diameter of the jet hole is 20mm.

[0076] refer to Figure 3 , after being premixed with natural gas, it enters the first mixing unit. The first mixing unit includes two groups of "X"-shaped baffles, and is arranged with flow holes with a diameter of 30mm. The aspect ratio of the mixing unit is 0.75, the thickness of the baffles is 2mm, the baffles are 90° apart, and each baffle is 45° to the axis of the pipeline flow direction. When the fluid passes through the first mixing unit, a part of the fluid is divided by the baffles, causing the fluid to rotate, divide, change direction, and merge, thereby promoting uniform mixing of the fluid; the other part of the fluid flows through the flow holes of the baffles, and this part of the fluid forms a jet, which is further mixed with the fluid diverted by the baffles, thereby improving the uniformity of mixing.

[0077] refer to Figure 4 , the fluid enters the second mixing unit after passing through the first mixing unit. The second mixing unit is staggered with the first mixing unit at 90 degrees. This arrangement can cause the fluid to produce a 90-degree circumferential rotation motion, further increase the circumferential mixing on the flow direction mixing and radial mixing, and promote uniform mixing of the fluid in the three dimensions of flow direction, radial direction and rotation.

[0078] refer to Figure 7 The mixing process of natural gas and hydrogen is as follows: hydrogen enters the injection chamber from the hydrogen inlet, then enters the three jet chambers from the injection chamber respectively, and then is ejected from the jet holes into the natural gas hydrogen premixing chamber of the premixing module; natural gas directly enters the natural gas hydrogen premixing chamber of the premixing module from the natural gas inlet, and flows through the three jet chambers in sequence, and is premixed with hydrogen in the full cross-section to obtain the hydrogen natural gas premixed gas;

[0079] Afterwards, the hydrogen-natural gas premixed gas enters the first blending unit for flow blending and radial blending to obtain the hydrogen-natural gas mixed gas;

[0080] Finally, the hydrogen-natural gas mixture enters the second blending unit for further directional blending and radial blending, and circumferential blending is performed at the same time to obtain the hydrogen-natural gas uniform mixture.

[0081] refer to Figure 8, wherein Figure (a) is a schematic diagram of the mixing effect of one SMX mixing unit; Figure (b) is a schematic diagram of the mixing effect of two SMX mixing units; Figure (c) is a schematic diagram of the mixing effect of the premixing module + two perforated mixing units of the present application. It can be seen from the figure that the mixing effect of the present application is better and the uniformity is higher; compared with the existing SMX mixer, the mixing uniformity is improved by 5.6%.

[0082] In the above technical scheme, in order to improve the mixing uniformity, a combination of step premixing and mixing units is used for mixing; the step premixing can inject hydrogen axially within the entire cross-sectional area, and the flow hole injection of the mixing unit can couple the jet and the deflection to further improve the mixing uniformity, promote uniform mixing of the fluid in the three dimensions of flow direction, radial direction and rotation, and reduce pipeline blockage and flow loss.

[0083] exist Figure 5 and Figure 6 In the embodiment of the present application, a blending method is provided, comprising the following steps:

[0084] Premixing hydrogen and natural gas by using a premixing module to obtain hydrogen-natural gas premixed gas;

[0085] The hydrogen-natural gas premixed gas is mixed with the mixing module to obtain a uniform hydrogen-natural gas mixed gas, wherein:

[0086] include:

[0087] Using a first blending unit, the hydrogen-natural gas premixed gas is subjected to flow blending and radial blending to obtain a hydrogen-natural gas mixed gas;

[0088] The hydrogen-natural gas mixture is further mixed in the flow direction and radial direction by using the second mixing unit, and is mixed in the circumferential direction at the same time, so as to obtain the hydrogen-natural gas uniform mixture.

[0089] In the above technical scheme, a premixing module and a blending module are provided, wherein the premixing module is used to premix hydrogen and natural gas to obtain a hydrogen-natural gas premixed gas; the blending module is used to blend the hydrogen-natural gas premixed gas to obtain a uniform hydrogen-natural gas mixture; the step premixing method is used to perform good premixing in the hydrogen injection stage, so that hydrogen can be injected over the entire cross-sectional area, and hydrogen and natural gas are well premixed in the premixing stage; the perforated baffle assembly is used to increase the jet while causing the fluid to rotate, split, change direction, and merge, and couple the jet with the steering phase to promote more uniform fluid mixing; the staggered arrangement of the blending units promotes the fluid to produce a rotational motion, increases the rotational dimension in the flow direction and radial dimensions, and promotes uniform fluid mixing in three dimensions; compared with the existing SMX blender, the blending uniformity is improved by 5.6%; and the pipeline blockage is reduced, the flow loss is reduced, and the flow resistance loss is reduced by 8.2%.

[0090] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art can change, modify, replace and modify the above embodiments within the scope of the present application. On this basis, a variety of replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A mixing device, characterized in that: include: Premixing module and blending module, wherein, The premixing module is used to premix hydrogen and natural gas to obtain hydrogen-natural gas premixed gas; The blending module is used to blend the hydrogen-natural gas premixed gas to obtain a uniform hydrogen-natural gas mixed gas.

2. The mixing device according to claim 1, characterized in that: The premixing module includes an injection chamber and a plurality of jet chambers, wherein: The jet cavities are sequentially arranged inside the injection chamber, and each of the jet cavities is distributed in a stepped manner and arranged in a staggered manner in the fluid flow direction of the injection chamber, so as to perform stepped injection and premixing of hydrogen within the entire cross-section.

3. The mixing device according to claim 2, characterized in that: The jet cavity is provided with a jet hole for jet injection of hydrogen.

4. The mixing device according to claim 3, characterized in that: The premixing module also includes a hydrogen inlet and a natural gas inlet, wherein: The natural gas inlet is arranged in a direction parallel to the central axis of the injection chamber; The hydrogen inlet is disposed in a direction perpendicular to a central axis of the injection chamber.

5. The mixing device according to claim 4, characterized in that: The hydrogen inlet is connected to the injection chamber, and each of the jet chambers is connected to the injection chamber respectively; The natural gas inlet is communicated with each of the jet chambers.

6. The blending device according to claim 5, characterized in that: The blending module comprises a first blending unit, wherein: The first blending unit is used to perform flow direction blending and radial blending on the hydrogen-natural gas premixed gas to obtain a hydrogen-natural gas mixed gas.

7. The blending device according to claim 6, characterized in that: The blending module further includes a second blending unit, wherein: The second blending unit is used to further blend the hydrogen-natural gas mixture in the flow direction and radial direction, and to blend it in the circumferential direction at the same time, so as to obtain the uniform hydrogen-natural gas mixture.

8. The blending device according to claim 7, characterized in that: The first blending unit includes a perforated baffle assembly, wherein: The perforated baffle assembly is used for performing flow direction mixing and radial mixing on the hydrogen and natural gas premixed gas.

9. The blending device according to claim 8, characterized in that: The second blending unit is arranged at an angle staggered with the first blending unit, and is used to further blend the hydrogen-natural gas mixture in the flow direction and radial direction, and simultaneously perform circumferential blending.

10. A blending method, characterized in that: The following steps are involved: Premixing hydrogen and natural gas by using a premixing module to obtain hydrogen-natural gas premixed gas; The hydrogen-natural gas premixed gas is mixed with the mixing module to obtain a uniform hydrogen-natural gas mixed gas. in, include: Using a first blending unit, the hydrogen-natural gas premixed gas is subjected to flow blending and radial blending to obtain a hydrogen-natural gas mixed gas; The hydrogen-natural gas mixture is further mixed in the flow direction and radial direction by using the second mixing unit, and is mixed in the circumferential direction at the same time, so as to obtain the hydrogen-natural gas uniform mixture.

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