Pi-type multi-stage hydrogen mixing device

Abstract

The utility model belongs to the technical field of natural gas hydrogen doping, and discloses a pi-shaped multi-stage hydrogen mixing device which comprises a mixing pipeline, a natural gas inlet pipe, a hydrogen inlet pipe and a mixer, the mixing pipeline is arranged in a pi shape, an outlet of the mixing pipeline is communicated with a downstream pipeline, the natural gas inlet pipe is communicated with an inlet of the mixing pipeline, the hydrogen inlet pipe is communicated with the mixing pipeline, and the mixer is communicated with the mixing pipeline. The mixing device is arranged in the mixing pipeline and is used for mixing hydrogen and natural gas; by arranging the mixing pipeline arranged in the pi shape, the space in the vertical direction of the natural gas station can be fully utilized, the occupied area is effectively reduced, the mixing length is not limited by the occupied area, and the mixing effect can be improved by increasing the length of the mixing pipeline in the vertical direction under the condition that the structures of the mixing internal parts are the same.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas hydrogen blending, in particular to a π-type multi-stage hydrogen blending device. Background Art

[0002] Hydrogen is a clean and efficient alternative energy source and one of the important energy sources for achieving the goal of continuously promoting green and low-carbon transformation. Therefore, the safe transportation of hydrogen has become extremely important. In recent years, it is generally believed that using the existing natural gas pipeline network to transport natural gas mixed with a certain proportion of hydrogen is an effective way to achieve large-scale transportation of hydrogen.

[0003] Therefore, natural gas stations have the need to install hydrogen blending devices, but some natural gas stations did not reserve space for the installation of blending devices during planning. As a result, the available space on site is relatively limited, and it is impossible to fully mix hydrogen and natural gas. However, if hydrogen and natural gas are not mixed evenly, stratification will occur. Local high concentrations of hydrogen may cause damage to downstream equipment (hydrogen-induced failure). In addition, hydrogen is flammable and explosive. If high-concentration hydrogen leaks, there will be a major safety hazard. Utility Model Content

[0004] The utility model aims to provide a π-type multi-stage hydrogen mixing device with good mixing effect and small space occupation.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A π-type multi-stage hydrogen mixing device, comprising:

[0007] A mixing pipeline, wherein the mixing pipeline is arranged in a π shape, and the outlet of the mixing pipeline is connected to a downstream pipeline;

[0008] A natural gas inlet pipe, the natural gas inlet pipe being connected to the inlet of the blending pipeline;

[0009] A hydrogen inlet pipe, the hydrogen inlet pipe being connected to the mixing pipe;

[0010] The blender is arranged inside the blending pipeline and is used for mixing hydrogen and natural gas.

[0011] Preferably, the mixing pipeline includes a first vertical pipe, a horizontal pipe and a second vertical pipe which are connected and arranged in a π shape, the end of the second vertical pipe facing away from the horizontal pipe is connected to the downstream pipeline, the inlet of the first vertical pipe is connected to the natural gas inlet pipe through a first elbow, the hydrogen inlet pipe is connected to the first vertical pipe through a second elbow, the mixer is arranged inside the first vertical pipe, and the mixer is located downstream of the connection between the second elbow and the first vertical pipe.

[0012] Preferably, the opening of the first elbow pipe facing away from the natural gas inlet pipe is coaxial with the first vertical pipe, the second elbow pipe extends into the first vertical pipe, and the opening of the second elbow pipe facing away from the hydrogen inlet pipe is coaxial with the first vertical pipe.

[0013] Preferably, the pipe diameter of the first elbow pipe is equal to that of the first vertical pipe, and the pipe diameter of the first elbow pipe is larger than that of the second elbow pipe.

[0014] Preferably, the first vertical pipe is connected to one end of the horizontal pipe through a third elbow pipe, and the other end of the horizontal pipe is connected to the second vertical pipe through a fourth elbow pipe.

[0015] Preferably, the third elbow pipe is flange-connected to the first vertical pipe, and the fourth elbow pipe is flange-connected to the second vertical pipe.

[0016] Preferably, the second vertical pipe is connected to the downstream pipeline through a fifth elbow pipe. The pipe diameter of the fifth elbow pipe is equal to that of the second vertical pipe, and the opening of the fifth elbow pipe close to the second vertical pipe is coaxial with the second vertical pipe.

[0017] Preferably, the π-shaped multi-stage hydrogen blending device further includes a bracket, and the bracket is connected to the bottom of the horizontal pipe for supporting the horizontal pipe.

[0018] Preferably, the first elbow pipe is connected to the natural gas inlet pipe through a flange, and the second elbow pipe is connected to the hydrogen inlet pipe through a flange.

[0019] Preferably, the blending pipeline, the natural gas inlet pipe, the hydrogen inlet pipe, the first elbow pipe, the second elbow pipe, the third elbow pipe, the fourth elbow pipe and the fifth elbow pipe are all made of stainless steel materials.

[0020] Advantages of the present utility model:

[0021] The present utility model provides a π-shaped multi-stage hydrogen blending device, which includes a blending pipeline, a natural gas inlet pipe, a hydrogen inlet pipe and a blender. The blending pipeline is arranged in a π shape. The outlet of the blending pipeline is connected to the downstream pipeline. The natural gas inlet pipe is connected to the inlet of the blending pipeline. The hydrogen inlet pipe is connected to the blending pipeline. The blender is arranged inside the blending pipeline for mixing hydrogen and natural gas. By arranging the blending pipeline in a π shape, the space in the vertical direction of the natural gas station can be fully utilized, the floor area can be effectively reduced, the blending length is not limited by the floor area, and the blending effect can be improved by increasing the vertical length of the blending pipeline under the condition that the internal structure of the blending internals is the same. Description of the drawings

[0022] Figure 1 is a schematic structural diagram of a π-shaped multi-stage hydrogen blending device provided by an embodiment of the present utility model;

[0023] Figure 2 This is a cross-sectional view of a π-shaped multi-stage hydrogen mixing device provided by an embodiment of the present utility model.

[0024] In the figure:

[0025] 1. Mixing pipeline; 11. First vertical pipe; 12. Horizontal pipe; 13. Second vertical pipe; 2. Hydrogen inlet pipe; 3. First elbow; 4. Second elbow; 5. Third elbow; 6. Fourth elbow; 7. Fifth elbow. Detailed implementation manners

[0026] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0027] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0029] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, 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. Therefore, it should not be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0030] At present, there is a need to install a hydrogen blending device in natural gas stations. However, some natural gas stations did not reserve installation space for the blending device during the planning stage, so the available space on site is relatively limited.

[0031] Therefore, this embodiment provides a π-shaped multi-stage hydrogen blending device, which has the characteristics of good mixing effect and small floor space, and can meet the requirements of natural gas stations.

[0032] Please refer to Figure 1 and Figure 2 A π-shaped multi-stage hydrogen blending device includes a blending pipeline 1, a natural gas inlet pipe, a hydrogen inlet pipe 2 and a blender. The natural gas inlet pipe is used to introduce natural gas into the blending pipeline 1, the hydrogen inlet pipe 2 is used to introduce hydrogen into the blending pipeline 1, and the blender is used to mix the natural gas and hydrogen in the blending pipeline 1.

[0033] The blending pipeline 1 is arranged in a π shape, and the outlet of the blending pipeline 1 is connected to the downstream pipeline to transport the mixed gas through the downstream pipeline.

[0034] Specifically, the blending pipeline 1 includes a connected first vertical pipe 11, a horizontal pipe 12 and a second vertical pipe 13. One end of the first vertical pipe 11 is connected to the natural gas inlet pipe, the other end is connected to one end of the horizontal pipe 12, the other end of the horizontal pipe 12 is connected to one end of the second vertical pipe 13, and the other end of the second vertical pipe 13 is connected to the downstream pipeline. Preferably, the first vertical pipe 11, the horizontal pipe 12 and the second vertical pipe 13 are arranged in a π shape.

[0035] Furthermore, please refer to Figure 1 and Figure 2 The second vertical pipe 13 is connected to the downstream pipeline through a fifth elbow 7 to reduce the pressure loss of the device. The diameter of the fifth elbow 7 is equal to the diameter of the second vertical pipe 13 to prevent leakage of the mixed gas and improve safety. Moreover, the opening of the fifth elbow 7 close to the second vertical pipe 13 is coaxial with the second vertical pipe 13 for the smooth flow of the mixed gas. Preferably, a flange is installed at the end of the fifth elbow 7 away from the second vertical pipe 13 to connect to the downstream pipeline with high connection strength.

[0036] Optionally, this embodiment is also provided with a bracket. Specifically, the bracket is connected to the bottom of the horizontal pipe 12 to provide support for the horizontal pipe 12 and improve the stability of the π-shaped multi-stage hydrogen blending device.

[0037] Furthermore, one end of the first vertical pipe 11, that is, the inlet of the first vertical pipe 11, is connected to the natural gas inlet pipe through a first elbow 3, and the hydrogen inlet pipe 2 is connected to the first vertical pipe 11 through a second elbow 4. The first elbow 3 and the second elbow 4 play a role in turning to facilitate controlling the flow directions of natural gas and hydrogen, and at the same time can also reduce the pressure loss.

[0038] It should be noted that the blender is arranged inside the first vertical pipe 11 and downstream of the connection between the second elbow pipe 4 and the first vertical pipe 11 to prevent uneven mixing of high-concentration hydrogen and natural gas.

[0039] Optionally, a variety of mixing structures are also arranged inside the first vertical pipe 11, the horizontal pipe 12 and the second vertical pipe 13 to further improve the mixing effect.

[0040] Preferably, the diameter of the first elbow pipe 3 is equal to the diameter of the first vertical pipe 11, which is convenient for connecting the natural gas inlet pipe and the first vertical pipe 11, and at the same time prevents natural gas leakage. Further preferably, the opening of the first elbow pipe 3 facing away from the natural gas inlet pipe is coaxially arranged with the first vertical pipe 11, so as to control the uniform distribution of natural gas after entering the first vertical pipe 11 and improve the subsequent mixing effect.

[0041] Furthermore, the first elbow pipe 3 is connected to the natural gas inlet pipe through a flange, which has a large connection strength and can be disassembled, facilitating replacement and maintenance.

[0042] It should be noted that the second elbow pipe 4 extends into the first vertical pipe 11, and the opening of the second elbow pipe 4 facing away from the hydrogen inlet pipe 2 is coaxially arranged with the first vertical pipe 11. That is, the opening of the second elbow pipe 4 facing away from the hydrogen inlet pipe 2, the opening of the first elbow pipe 3 facing away from the natural gas inlet pipe and the first vertical pipe 11 are coaxially arranged. Through the above settings, hydrogen flows along the axis of the first vertical pipe 11, and natural gas is evenly distributed around, which can avoid the "wall attachment effect" and improve the mixing uniformity. At the same time, since high-purity hydrogen does not directly contact the inner wall of the blender, the hydrogen corrosion of the inner wall of the blender can be reduced, and the service life of the device can be improved.

[0043] Please refer to Figure 1 and Figure 2 , the diameter of the first elbow pipe 3 is larger than the diameter of the second elbow pipe 4, so that natural gas is distributed around hydrogen to prevent hydrogen from directly contacting the inner wall of the blender.

[0044] Preferably, one end of the horizontal pipe 12 is connected to the first vertical pipe 11 through a third elbow pipe 5, and the other end of the horizontal pipe 12 is connected to the second vertical pipe 13 through a fourth elbow pipe 6, which plays a role in smoothly turning the mixed gas and can also reduce the pressure loss.

[0045] Furthermore, the third elbow 5 is flange-connected to the first vertical pipe 11, and the fourth elbow 6 is flange-connected to the second vertical pipe 13. That is to say, the third elbow 5 is detachably connected to the first vertical pipe 11, and the fourth elbow 6 is detachably connected to the second vertical pipe 13. Since the density of hydrogen is relatively low, stratification is more likely to occur inside the horizontal pipe 12. Therefore, if stratification occurs, the corrosion degree of the horizontal pipe 12 will be more serious than that of other parts of the device. Therefore, by designing the horizontal pipe 12 as a replaceable form with flange connection and regularly checking, if the inside of the horizontal pipe 12 is severely corroded, it can be replaced to achieve the purpose of improving the overall service life and reducing the use cost.

[0046] Since hydrogen atoms are likely to cause hydrogen-induced failure to carbon steel materials, in this embodiment, the first vertical pipe 11, the horizontal pipe 12, the second vertical pipe 13, the natural gas inlet pipe, the hydrogen inlet pipe 2, the first elbow 3, the second elbow 4, the third elbow 5, the fourth elbow 6 and the fifth elbow 7 are all made of stainless steel materials, thereby improving the overall safety.

[0047] A π-type multi-stage hydrogen blending device provided in this embodiment can make full use of the vertical space of the natural gas station by arranging the blending pipeline 1 in a π shape, effectively reducing the floor area. The blending length is not limited by the floor area. Under the condition that the internal structure of the blending component is the same, the blending effect can be improved by increasing the lengths of the first vertical pipe 11 and the second vertical pipe 13.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A π-type multi-stage hydrogen mixing device, characterized in that: include: A mixing pipeline (1), wherein the mixing pipeline (1) is arranged in a π-shape, and an outlet of the mixing pipeline (1) is connected to a downstream pipeline; A natural gas inlet pipe, the natural gas inlet pipe being connected to the inlet of the blending pipeline (1); A hydrogen inlet pipe (2), the hydrogen inlet pipe (2) being connected to the mixing pipe (1); A blender is arranged inside the blending pipeline (1) and is used for mixing hydrogen and natural gas.

2. A π-type multi-stage hydrogen mixing device according to claim 1, characterized in that: The blending pipeline (1) comprises a first vertical pipe (11), a horizontal pipe (12) and a second vertical pipe (13) which are connected and arranged in a π shape; the end of the second vertical pipe (13) which is away from the horizontal pipe (12) is connected to the downstream pipeline; the inlet of the first vertical pipe (11) is connected to the natural gas inlet pipe through a first elbow pipe (3); the hydrogen inlet pipe (2) is connected to the first vertical pipe (11) through a second elbow pipe (4); the blender is arranged inside the first vertical pipe (11), and the blender is located downstream of the connection point between the second elbow pipe (4) and the first vertical pipe (11).

3. A π-type multi-stage hydrogen mixing device according to claim 2, characterized in that: The opening of the first elbow (3) facing away from the natural gas inlet pipe is coaxial with the first vertical pipe (11), the second elbow (4) extends into the first vertical pipe (11), and the opening of the second elbow (4) facing away from the hydrogen inlet pipe (2) is coaxial with the first vertical pipe (11).

4. A π-type multi-stage hydrogen mixing device according to claim 3, characterized in that: The diameter of the first curved pipe (3) is equal to the diameter of the first vertical pipe (11), and the diameter of the first curved pipe (3) is greater than the diameter of the second curved pipe (4).

5. A π-type multi-stage hydrogen mixing device according to claim 2, characterized in that: The first vertical pipe (11) is connected to one end of the horizontal pipe (12) through a third curved pipe (5), and the other end of the horizontal pipe (12) is connected to the second vertical pipe (13) through a fourth curved pipe (6).

6. A π-type multi-stage hydrogen mixing device according to claim 5, characterized in that: The third curved pipe (5) is flange-connected to the first vertical pipe (11), and the fourth curved pipe (6) is flange-connected to the second vertical pipe (13).

7. A π-type multi-stage hydrogen mixing device according to claim 2, characterized in that: The second vertical pipe (13) is connected to the downstream pipeline through a fifth elbow pipe (7); the diameter of the fifth elbow pipe (7) is equal to the diameter of the second vertical pipe (13); and the opening of the fifth elbow pipe (7) close to the second vertical pipe (13) is coaxial with the second vertical pipe (13).

8. A π-type multi-stage hydrogen mixing device according to any one of claims 2 to 7, characterized in that: The π-type multi-stage hydrogen mixing device further comprises a bracket, which is connected to the bottom of the transverse tube (12) and is used to support the transverse tube (12).

9. A π-type multi-stage hydrogen mixing device according to any one of claims 2 to 7, characterized in that: The first elbow (3) is connected to the natural gas inlet pipe via a flange, and the second elbow (4) is connected to the hydrogen inlet pipe (2) via a flange.

10. A π-type multi-stage hydrogen mixing device according to any one of claims 1 to 7, characterized in that: The mixing pipeline (1), the natural gas inlet pipe, the hydrogen inlet pipe (2), the first bend pipe (3), the second bend pipe (4), the third bend pipe (5), the fourth bend pipe (6) and the fifth bend pipe (7) are all made of stainless steel.

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