CN219376724U - Natural gas hydrogen-adding system - Google Patents
Natural gas hydrogen-adding system Download PDFInfo
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- CN219376724U CN219376724U CN202320204009.9U CN202320204009U CN219376724U CN 219376724 U CN219376724 U CN 219376724U CN 202320204009 U CN202320204009 U CN 202320204009U CN 219376724 U CN219376724 U CN 219376724U
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Abstract
The utility model relates to the technical field of natural gas hydrogen loading, and discloses a natural gas hydrogen loading system, which comprises a first natural gas flow regulating valve, a first natural gas flow meter, a follow-up natural gas hydrogen mixer, a hydrogen component detector, an outlet regulating valve, a second natural gas flow meter and a static natural gas hydrogen mixer, wherein the first natural gas flow regulating valve, the first natural gas flow meter, the follow-up natural gas hydrogen mixer, the hydrogen component detector and the outlet regulating valve are sequentially connected along the natural gas flow direction; the hydrogen flow control device further comprises a first hydrogen flow control valve and a first hydrogen flow meter which are sequentially connected along the hydrogen flow direction. The utility model solves the problems that the prior art is difficult to keep full-flow uniform blending under the conditions of high flow change ratio and high mixing ratio of natural gas and hydrogen so as to meet the experiment or production requirement of high-precision hydrogen blending.
Description
Technical Field
The utility model relates to the technical field of natural gas hydrogen loading, in particular to a natural gas hydrogen loading system.
Background
The main characteristics of renewable power are that the volatility and randomness are great, and the renewable power is intermittent along with environmental and weather changes. The hydrogen can be stored in a good way by electrolyzing water, but the storage and transportation after hydrogen production and large-scale application are pain points in the industry, and the reasonable selection of the hydrogen transportation mode and the reduction of the transportation cost are always important points in the industry. Currently, gaseous hydrogen is transported by vehicles and ships equipped with high-pressure vessels and pipe network, and as the hydrogenation demand increases, pipeline transportation mode will become a future hot spot. The natural gas pipeline is used for carrying out hydrogen and natural gas mixed transportation, so that reasonable utilization of hydrogen energy can be promoted to a certain extent, and a transportation channel can be provided for downstream hydrogen energy extraction; meanwhile, there is also a consumer market demand for separation after delivery of a hydrogen source to a natural gas pipeline "lift".
The property difference of hydrogen and methane is great, especially in the combustion performance, if the mixing uniformity of two gases is low, or layering phenomenon appears in the back-end pipeline, can cause Hua Bai number of mixed gas and burning potential disorder, and two gases all belong to inflammable and explosive medium, easily lead to the safe in utilization of gas equipment. Secondly, pure hydrogen can easily generate hydrogen corrosion, hydrogen bulge, hydrogen embrittlement and other influences on the pipeline made of carbon steel materials, so that the final gas mixing uniformity is generally required to be more than 95%. However, when the flow rate of the flowmeter used for actual blending is below 3%, the flowmeter may have larger deviation based on the existing general measuring instrument technology, and under the conditions that the high flow rate change ratio exists at the gas end and the natural gas and hydrogen high blending ratio change, the full flow rate is difficult to keep uniform gas mixing, and the production/experiment requirements of the terminal cannot be met. To this end, we propose a natural gas loading system to solve the above problems.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a natural gas hydrogen-adding system, which solves the problems that the prior art is difficult to keep full-flow uniform mixing under the conditions of high flow change ratio and high mixing ratio of natural gas and hydrogen so as to meet the experiment or production requirement of high-precision hydrogen mixing.
The utility model solves the problems by adopting the following technical scheme:
the natural gas hydrogen loading system comprises a first natural gas flow regulating valve, a first natural gas flowmeter, a follow-up natural gas hydrogen mixer, a hydrogen component detector and an outlet regulating valve which are sequentially connected along the natural gas flow direction, and also comprises a second natural gas flow regulating valve, a second natural gas flowmeter and a static natural gas hydrogen mixer which are sequentially connected along the natural gas flow direction, wherein the output end of the static natural gas hydrogen mixer is connected with the input end of the hydrogen component detector;
the hydrogen flow control device comprises a hydrogen flow control device, a hydrogen flow control valve, a first hydrogen flow meter, a second hydrogen flow control valve, a second hydrogen flow meter and a static natural gas hydrogen mixer, wherein the first hydrogen flow control valve and the first hydrogen flow meter are sequentially connected along the hydrogen flow direction, the output end of the first hydrogen flow meter is connected with the input end of the follow-up natural gas hydrogen mixer, the second hydrogen flow control valve and the second hydrogen flow meter are sequentially connected along the hydrogen flow direction, and the output end of the second hydrogen flow meter is connected with the input end of the static natural gas hydrogen mixer.
As a preferable technical scheme, the device further comprises a first natural gas cut-off valve connected to the front end of the first natural gas flow regulating valve and a first hydrogen cut-off valve connected to the front end of the first hydrogen flow regulating valve.
As a preferable technical scheme, the system further comprises a second natural gas cut-off valve connected to the front end of the second natural gas flow regulating valve.
As a preferable technical scheme, the natural gas storage system further comprises a natural gas pressure regulating valve and a natural gas storage tank, wherein the natural gas pressure regulating valve, the second natural gas cut-off valve, the natural gas storage tank and the second natural gas flow regulating valve are sequentially connected along the natural gas flow direction.
As a preferable technical scheme, the hydrogen gas flow control device further comprises a second hydrogen gas cut-off valve connected to the front end of the second hydrogen gas flow control valve.
As a preferable technical scheme, the hydrogen storage device further comprises a hydrogen pressure regulating valve and a hydrogen cache tank, wherein the hydrogen pressure regulating valve, the second hydrogen shut-off valve, the hydrogen cache tank and the second hydrogen flow regulating valve are sequentially connected along the hydrogen flow direction.
As a preferable technical scheme, the hydrogen-containing natural gas storage tank further comprises a hydrogen-containing natural gas storage tank and a pressure gauge connected to the hydrogen-containing natural gas storage tank, wherein the hydrogen component detector, the hydrogen-containing natural gas storage tank and the outlet regulating valve are sequentially connected along the natural gas or hydrogen flow direction.
As a preferable technical scheme, the hydrogen-containing natural gas storage tank further comprises an outlet cut-off valve, one end of the outlet cut-off valve is connected with the output end of the outlet regulating valve, and the other end of the outlet cut-off valve is connected with the output end of the hydrogen-containing natural gas storage tank.
As a preferable technical scheme, the system further comprises a check valve, and the static natural gas hydrogen mixer, the check valve and the hydrogen component detector are sequentially connected along the natural gas flow direction.
Compared with the prior art, the utility model has the following beneficial effects:
(1) The follow-up and static mixing flows are combined together for the first time, so that the natural gas hydrogen mixing with the wide mixing proportion of 0-100% can be realized, the adaptive flow fluctuation range is wider, and the natural gas hydrogen mixing experiment or production requirement with the wide proportion and high fluctuation is met;
(2) The utility model is very suitable for being used in small-scale natural gas hydrogen-adding scenes such as scientific experiments, enterprises, communities, families and the like, and is used as key equipment in the hydrogen production of distributed energy residual electricity.
Drawings
Fig. 1 is a schematic structural diagram of a natural gas loading system according to the present utility model.
The reference numerals in the drawings and their corresponding names: 1. a first natural gas cut-off valve, 2, a first natural gas flow regulating valve, 3, a first natural gas flowmeter, 4, a follow-up natural gas hydrogen mixer, 5, a first hydrogen cut-off valve, 6, a first hydrogen flow regulating valve, 7, a first hydrogen flowmeter, 8, a hydrogen component detector, 9, a hydrogen-containing natural gas buffer tank, 10, a pressure gauge, 11, a natural gas pressure regulating valve, 12, a second natural gas cut-off valve, 13, a natural gas buffer tank, 14, a second natural gas flow regulating valve, 15, a second natural gas flowmeter, 16, a static natural gas hydrogen mixer, 17, a hydrogen pressure regulating valve, 18, a second hydrogen cut-off valve, 19, a hydrogen buffer tank, 20, a second hydrogen flow regulating valve, 21, a second hydrogen flowmeter, 22, an outlet regulating valve, 23, an outlet cut-off valve, 24 and a check valve.
Detailed Description
The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.
Example 1
As shown in fig. 1, in order to overcome the problem of the conventional natural gas loading apparatus at a high flow rate variation ratio (preset to 0m in the present utility model 3 -1000m 3 ) The utility model provides a natural gas hydrogen blending system with large flow change and wide blending proportion, which is formed by combining a follow-up large-flow blending system, a follow-up small-flow blending system and a static micro-flow blending system.
A natural gas hydrogen loading system is suitable for high fluctuation wide-proportion natural gas hydrogen loading, and comprises a follow-up large-flow mixing system and a static small-flow mixing system; wherein:
1. follow-up high-flow blending system:
the follow-up high-flow blending system comprises a first natural gas cut-off valve 1, a first natural gas flow regulating valve 2, a first natural gas flow meter 3, a follow-up natural gas hydrogen mixer 4, a first hydrogen cut-off valve 5, a first hydrogen flow regulating valve 6, a first hydrogen flow meter 7, a hydrogen component detector 8, a hydrogen-containing natural gas buffer tank 9, a pressure gauge 10, an outlet regulating valve 22 and a check valve 24;
the connection mode in the follow-up high-flow blending system is as follows: the first natural gas cut-off valve 1 is sequentially connected with a first natural gas flow regulating valve 2, a first natural gas flowmeter 3, a follow-up natural gas hydrogen mixer 4, a hydrogen component detector 8 and a hydrogen-containing natural gas buffer tank 9; the first hydrogen cut-off valve 5 is sequentially connected with a first hydrogen flow regulating valve 6, a first hydrogen flowmeter 7 and a follow-up natural gas hydrogen mixer 4; the pressure gauge 10 is arranged on the hydrogen-containing natural gas cache tank 9; the check valve is arranged at the outlet of the static low-flow blending system to prevent the high-pressure gas of the follow-up high-flow blending system from flowing back and overpressure.
The follow-up natural gas hydrogen mixer can adopt a mixer which is common in engineering and provided with baffle plates (or corrugated sheets), so that different fluids can flow in a Z shape in a three-dimensional space, and are respectively dispersed and mixed with each other.
The working mode of the follow-up high-flow blending system is as follows: the natural gas from the natural gas pipe network passes through a first natural gas flow regulating valve 2, and the flow of the natural gas with the pressure of 4MPa is accurately controlled by a first natural gas flow meter 3 and then is sent to a follow-up natural gas hydrogen mixer 4; 4MPa hydrogen from a hydrogen pipe network is sent to the follow-up natural gas hydrogen mixer 4 after the flow of high-pressure hydrogen is accurately controlled through a first hydrogen flow regulating valve 6; the natural gas and the hydrogen in the follow-up natural gas hydrogen mixer 4 are fully mixed, the hydrogen component detector 8 at the outlet of the follow-up natural gas hydrogen mixer 4 detects the mixing effect, and the pressure is regulated to 0.35MPa through the outlet regulating valve 22 after the detection is qualified, and then the mixture is externally conveyed for use. When the hydrogen component detector 8 detects that the hydrogen component is abnormal, the opening degrees of the first natural gas flow regulating valve 2 and the first hydrogen flow regulating valve 6 are adjusted in real time according to the detection result, so that the gas mixing index is ensured to reach the set requirement again.
2. Static low flow blending system:
the static small-flow blending system comprises a natural gas pressure regulating valve 11, a second natural gas cut-off valve 12, a natural gas buffer tank 13, a second natural gas flow regulating valve 14, a second natural gas flow meter 15, a static natural gas hydrogen mixer 16, a hydrogen pressure regulating valve 17, a second hydrogen cut-off valve 18, a hydrogen buffer tank 19, a second hydrogen flow regulating valve 20, a second hydrogen flow meter 21, an outlet regulating valve 22, an outlet cut-off valve 23 and a check valve 24;
besides adopting the baffle plate (or corrugated sheet) technology, the static natural gas hydrogen mixer generally adds a plurality of gas mixing technologies such as guide vane, precession and precession channel technology and the like to assist in forcibly mixing the gas at a lower flow rate.
The working mode of the static small-flow blending system is as follows: the high-pressure natural gas with the pressure of 4MPa from the natural gas pipe network is regulated to be 0.35MPa natural gas through a natural gas pressure regulating valve 11, then the natural gas with the pressure of 0.35MPa is filled into a natural gas buffer tank 13 through a second natural gas cut-off valve 12, the second natural gas cut-off valve 12 is closed, and the natural gas in the natural gas buffer tank 13 is conveyed to a static natural gas hydrogen mixer 16 after being regulated in flow through a second natural gas flow regulating valve 14 according to blending requirements (a second natural gas flowmeter 15 is linked); the high-pressure hydrogen with the pressure of 4MPa from the hydrogen pipe network is regulated to 0.35MPa hydrogen through the hydrogen pressure regulating valve 17, then the hydrogen with the pressure of 0.35MPa is filled into the hydrogen cache tank 19 through the second hydrogen cut-off valve 18, and the hydrogen in the hydrogen cache tank 19 is conveyed to the static natural gas hydrogen mixer 16 after being regulated in flow according to the blending requirement through the second hydrogen flow regulating valve 20 (the second hydrogen flow meter 21 is interlocked); the natural gas and the hydrogen in the static natural gas hydrogen mixer 16 are fully mixed, a check valve 24 is arranged at the outlet of the static natural gas hydrogen mixer 16, high-pressure gas is prevented from being returned, the check valve 24 is connected to the inlet of the hydrogen cache tank 19, the hydrogen component detector 8 is arranged at the inlet and is used for detecting the mixing effect, and the hydrogen-containing natural gas which is qualified in detection can be used for outputting gas through an outlet cut-off valve 23. When the hydrogen component detector 8 detects that the hydrogen component is abnormal, the opening of the second natural gas flow regulating valve 14 and the opening of the second hydrogen flow regulating valve 20 are adjusted in real time according to the detection result, so that the gas mixing index is ensured to meet the set requirement. When the gas consumption is slightly larger, the natural gas pressure regulating valve 11 and the hydrogen pressure regulating valve 17 can be regulated to be mixed, and the mixed qualified gas can be output with the outlet regulating valve 22 through secondary pressure regulating flow.
The working principle of the utility model is as follows:
the high-pressure natural gas and hydrogen are fully mixed by two sets of systems, namely a follow-up high-flow blending system and a static low-flow blending system, and are output after meeting the index requirement. Wherein:
(1) In a follow-up high flow blending system: the natural gas from the natural gas pipe network is conveyed to a follow-up natural gas hydrogen mixer 4 after being precisely measured by a first natural gas flow regulating valve 2 and a first natural gas flowmeter 3; the hydrogen from the hydrogen pipe network is conveyed to the follow-up natural gas hydrogen mixer 4 after being precisely metered by a first hydrogen flow regulating valve 6 and a first hydrogen flow meter 7; the natural gas and the hydrogen in the follow-up natural gas hydrogen mixer 4 are fully mixed, the hydrogen component detector 8 at the outlet of the follow-up natural gas hydrogen mixer 4 detects the mixing effect, and the pressure is regulated by the outlet regulating valve 22 and then is externally transmitted for use after the detection is qualified. When the hydrogen component detector 8 detects that the hydrogen component is abnormal, the opening degrees of the first natural gas flow regulating valve 2 and the first hydrogen flow regulating valve 6 are adjusted in real time according to the detection result, so that the gas mixing index is ensured to reach the set requirement again. The 4MPa air source pressure and the 0.35MPa user pressure are only preset pressures which are convenient to describe, and the method can be practically popularized to any higher air source pressure and lower user pressure, and has the protection of patents.
(2) In a static low flow blending system: the high-pressure natural gas with the pressure of 4MPa from the natural gas pipe network is regulated to be 0.35MPa natural gas through a natural gas pressure regulating valve 11, then the natural gas with the pressure of 0.35MPa is filled into a natural gas buffer tank 13 through a second natural gas cut-off valve 12, the second natural gas cut-off valve 12 is closed, and the natural gas in the natural gas buffer tank 13 is conveyed to a static natural gas hydrogen mixer 16 after being regulated in flow through a second natural gas flow regulating valve 14 according to blending requirements (a second natural gas flowmeter 15 is linked); the high-pressure hydrogen with the pressure of 4MPa from the hydrogen pipe network is regulated to 0.35MPa hydrogen through the hydrogen pressure regulating valve 17, then the hydrogen with the pressure of 0.35MPa is filled into the hydrogen cache tank 19 through the second hydrogen cut-off valve 18, and the hydrogen in the hydrogen cache tank 19 is conveyed to the static natural gas hydrogen mixer 16 after being regulated in flow according to the blending requirement through the second hydrogen flow regulating valve 20 (the second hydrogen flow meter 21 is interlocked); the natural gas and the hydrogen in the static natural gas hydrogen mixer 16 are fully mixed, a check valve 24 is arranged at the outlet of the static natural gas hydrogen mixer 16, high-pressure gas is prevented from being returned, the check valve 24 is connected to the inlet of the hydrogen cache tank 19, the hydrogen component detector 8 is arranged at the inlet and is used for detecting the mixing effect, and the hydrogen-containing natural gas which is qualified in detection can be used for outputting gas through an outlet cut-off valve 23. When the hydrogen component detector 8 detects that the hydrogen component is abnormal, the opening of the second natural gas flow regulating valve 14 and the opening of the second hydrogen flow regulating valve 20 are adjusted in real time according to the detection result, so that the gas mixing index is ensured to meet the set requirement. When the gas consumption is slightly larger, the natural gas pressure regulating valve 11 and the hydrogen pressure regulating valve 17 can be regulated to be mixed, and the mixed qualified gas can be output with the outlet regulating valve 22 through secondary pressure regulating flow. The 4MPa air source pressure and the 0.35MPa user pressure are only preset pressures which are convenient to describe, and the method can be practically popularized to any higher air source pressure and lower user pressure, and has the protection of patents.
Compared with the prior art, the utility model has the following positive effects:
the utility model combines the follow-up and static mixing flows for the first time, can meet the experiment or production requirement of the natural gas mixing hydrogen with wide mixing proportion of 0-100% under high fluctuation flow with high precision, wherein the follow-up high-flow mixing system mainly meets the requirement of high flow (3-100% of the maximum operation flow, the utility model is preset as follows)>30m 3 ) Is preset as<30m 3 ) Blending the use requirements. The utility model is very suitable for small-scale natural gas hydrogen-adding use of scientific experiments, enterprises, communities, families and the like, and is used as key equipment for hydrogen production of distributed energy residual electricity. Under the condition of adding a follow-up blending branch, the utility model can support high-precision natural gas blending hydrogen with larger flow.
As described above, the present utility model can be preferably implemented.
All of the features disclosed in all of the embodiments of this specification, or all of the steps in any method or process disclosed implicitly, except for the mutually exclusive features and/or steps, may be combined and/or expanded and substituted in any way.
The foregoing description of the preferred embodiment of the utility model is not intended to limit the utility model in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the utility model.
Claims (8)
1. The natural gas hydrogen loading system is characterized by comprising a first natural gas flow regulating valve (2), a first natural gas flowmeter (3), a follow-up natural gas hydrogen mixer (4), a hydrogen component detector (8) and an outlet regulating valve (22) which are sequentially connected along the natural gas flow direction, and further comprising a second natural gas flow regulating valve (14), a second natural gas flowmeter (15) and a static natural gas hydrogen mixer (16) which are sequentially connected along the natural gas flow direction, wherein the output end of the static natural gas hydrogen mixer (16) is connected with the input end of the hydrogen component detector (8);
the hydrogen mixing device further comprises a first hydrogen flow regulating valve (6) and a first hydrogen flow meter (7) which are sequentially connected along the hydrogen flow direction, wherein the output end of the first hydrogen flow meter (7) is connected with the input end of the follow-up natural gas hydrogen mixer (4), and the hydrogen mixing device further comprises a second hydrogen flow regulating valve (20) and a second hydrogen flow meter (21) which are sequentially connected along the hydrogen flow direction, and the output end of the second hydrogen flow meter (21) is connected with the input end of the static natural gas hydrogen mixer (16).
2. A natural gas loading system according to claim 1, further comprising a first natural gas shut-off valve (1) connected to the front end of the first natural gas flow regulating valve (2), and a first hydrogen shut-off valve (5) connected to the front end of the first hydrogen flow regulating valve (6).
3. A natural gas loading system according to claim 2, further comprising a second natural gas shut-off valve (12) connected to the front end of the second natural gas flow regulating valve (14).
4. A natural gas loading system according to claim 3, further comprising a natural gas pressure regulating valve (11), a natural gas buffer tank (13), wherein the natural gas pressure regulating valve (11), the second natural gas shut-off valve (12), the natural gas buffer tank (13) and the second natural gas flow regulating valve (14) are connected in sequence along the natural gas flow direction.
5. A natural gas loading system according to claim 4, further comprising a second hydrogen shut-off valve (18) connected to a front end of the second hydrogen flow regulator valve (20).
6. The natural gas hydrogen adding system according to claim 5, further comprising a hydrogen pressure regulating valve (17), a hydrogen buffer tank (19), wherein the hydrogen pressure regulating valve (17), the second hydrogen shut-off valve (18), the hydrogen buffer tank (19) and the second hydrogen flow regulating valve (20) are sequentially connected along the hydrogen flow direction.
7. A natural gas loading system according to any one of claims 1 to 6, further comprising a hydrogen-containing natural gas buffer tank (9), a pressure gauge (10) connected to the hydrogen-containing natural gas buffer tank (9), and a hydrogen component detector (8), the hydrogen-containing natural gas buffer tank (9), and an outlet regulating valve (22) connected in sequence along the natural gas or hydrogen flow direction.
8. The natural gas hydrogen loading system according to claim 7, further comprising an outlet shutoff valve (23), wherein one end of the outlet shutoff valve (23) is connected to the output end of the outlet regulating valve (22), and the other end of the outlet shutoff valve (23) is connected to the output end of the hydrogen-containing natural gas buffer tank (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320204009.9U CN219376724U (en) | 2023-02-03 | 2023-02-03 | Natural gas hydrogen-adding system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320204009.9U CN219376724U (en) | 2023-02-03 | 2023-02-03 | Natural gas hydrogen-adding system |
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| CN219376724U true CN219376724U (en) | 2023-07-21 |
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| CN202320204009.9U Active CN219376724U (en) | 2023-02-03 | 2023-02-03 | Natural gas hydrogen-adding system |
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