CN113390019A - Natural gas hydrogen mixing system - Google Patents
Natural gas hydrogen mixing system Download PDFInfo
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- CN113390019A CN113390019A CN202110753140.6A CN202110753140A CN113390019A CN 113390019 A CN113390019 A CN 113390019A CN 202110753140 A CN202110753140 A CN 202110753140A CN 113390019 A CN113390019 A CN 113390019A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/34—Hydrogen distribution
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Abstract
The invention relates to a natural gas hydrogen mixing system, which is characterized in that a hydrogen gas source, a hydrogen pressure regulating mechanism and a hydrogen buffer tank are sequentially arranged on a hydrogen input pipeline, wherein the hydrogen pressure regulating mechanism is used for regulating the gas supply pressure of hydrogen; the hydrogen buffer tank is used for storing hydrogen and buffering and stabilizing pressure; the natural gas pressure regulating mechanism is used for regulating the gas supply pressure of the natural gas; and the mixing tank is connected with the tail ends of the hydrogen input pipeline and the natural gas input pipeline and is connected with a gas main pipe network, and is used for uniformly mixing the input hydrogen and the input natural gas and then outputting the mixture to the gas main pipe network for transmission and distribution. The pressure regulating mechanism is used for respectively regulating the pressure of the input hydrogen and the natural gas to ensure that the gas supply pressure respectively meets the mixing pressure, and the hydrogen mixing of the natural gas in the mixing tank is ensured to be smoothly carried out through the pressure stabilization of the hydrogen buffer tank; the problem of large-scale hydrogen transportation can be solved by avoiding the construction of a hydrogen transportation pipe network, and the method has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of natural gas and hydrogen mixing, and particularly relates to a natural gas and hydrogen mixing system.
Background
With the development of society, primary energy sources mainly using fossil fuels such as petroleum and coal are difficult to meet the demand. Environmental pollution, greenhouse effect and fossil energy are gradually exhausted, so that the search for novel clean energy is urgent. Hydrogen energy is a clean secondary energy carrier and has been widely concerned at home and abroad for a long time, wherein a safe and efficient hydrogen transportation technology is one of the main bottlenecks in large-scale application of hydrogen energy. The pipeline has large hydrogen transportation amount and low cost, but a special hydrogen pipeline needs to be constructed.
The technology of natural gas mixed hydrogen transportation is a new hydrogen transportation scheme proposed in developed countries in recent years. The technology utilizes the existing natural gas pipeline facilities, avoids huge construction investment of a hydrogen transportation pipeline network, and is expected to solve the problem of large-scale transportation of hydrogen.
Hydrogen and methane are from different sources, hydrogen is a secondary energy source and is produced by a primary energy source, and natural gas is an artificially mined fossil energy source. It is currently believed that a hydrogen-natural gas mixture for pipeline transportation can be achieved by 3 forms:
1) the produced hydrogen is injected upstream of the natural gas pipeline network after mixing with the produced natural gas. According to the natural gas pipe network volume of the current industrial countries, even if the mixed hydrogen natural gas with lower hydrogen volume fraction is adopted, a large amount of hydrogen can be generated, which directly drives the development of the hydrogen energy industry.
2) The hydrogen-methane mixture is directly produced and injected upstream of the natural gas pipeline network, and the mixture can be derived from the hydrogen-methane mixture produced by the methane-steam reforming technology. In addition, the biomass hydrogen production technology is also expected to produce hydrogen-methane mixed gas.
3) In the area covered by natural gas pipe network, various renewable energy sources are utilized to produce hydrogen according to local conditions, and the hydrogen is mixed with gas in the pipe network and then injected. The mode can integrate multiple renewable energy sources, and promotes energy cleanliness and benefit maximization.
However, the existing natural gas hydrogen mixing and conveying technology generally has the problem that the uniformity of the mixed hydrogen is difficult to ensure, and further the safe distribution of the mixed gas is difficult to ensure.
Disclosure of Invention
The invention aims to solve the technical problem that hydrogen is mixed into a natural gas pipe network, and the hydrogen-mixed natural gas pipe network consists of a pressure regulating mechanism and a buffer device, so that the hydrogen can be safely and uniformly mixed with the natural gas, and the mixed gas can be safely transported and distributed.
The invention provides a natural gas hydrogen mixing system, which is characterized in that a hydrogen gas source, a hydrogen pressure regulating mechanism and a hydrogen buffer tank are sequentially arranged on a hydrogen input pipeline, wherein the hydrogen pressure regulating mechanism is used for regulating the gas supply pressure of hydrogen; the hydrogen buffer tank is used for storing hydrogen and buffering and stabilizing pressure; the natural gas pressure regulating mechanism is used for regulating the gas supply pressure of the natural gas; and the mixing tank is connected with the tail ends of the hydrogen input pipeline and the natural gas input pipeline and is connected with a gas main pipe network, and is used for uniformly mixing the input hydrogen and the input natural gas and outputting the mixture to the gas main pipe network for transmission and distribution.
Further, the hydrogen mixing device also comprises a pressure stabilizing mechanism arranged between the hydrogen buffer tank and the mixing tank.
The natural gas mixing device further comprises a bypass pipeline and a first valve, wherein the bypass pipeline is used for communicating the output end of the natural gas source with the output end of the mixing tank, the first valve is arranged on the bypass pipeline, and when the hydrogen gas source does not output hydrogen, the first valve can be opened to enable natural gas to be conveyed through the bypass pipeline.
Further, the hydrogen pressure regulating device further comprises a first cut-off valve which is arranged on the hydrogen input pipeline and is positioned at the front end of the hydrogen pressure regulating mechanism, and the first cut-off valve can be automatically closed when the hydrogen pressure regulating mechanism breaks down or the hydrogen input pipeline loses pressure.
Further, the hydrogen and natural gas circulation system further comprises a connecting pipeline used for communicating the hydrogen gas source with the natural gas source, and a second valve arranged on the connecting pipeline, wherein the second valve can be opened and other valves can be closed to realize internal circulation of the hydrogen gas source and the natural gas source.
Further, hydrogen pressure regulating mechanism includes first sub-pipeline and the second sub-pipeline that connects in parallel each other and sets up third valve on the first sub-pipeline sets up the fourth valve that just arranges in proper order on the second sub-pipeline, first governing valve and fifth valve, first governing valve can be with hydrogen gas supply pressure adjustment for the pressure threshold value of blending tank.
Further, the natural gas pressure regulating mechanism includes third sub-pipeline and fourth sub-pipeline and the setting that connects in parallel each other and is in sixth valve on the third sub-pipeline sets up the seventh valve that just arranges in proper order on the fourth sub-pipeline, second governing valve and eighth valve, the second governing valve can be with the adjustment of natural gas air feed pressure for the pressure threshold value of blending tank.
Further, the pressure stabilizing mechanism comprises a second stop valve, a check valve and a ninth valve which are sequentially arranged on the hydrogen input pipeline, and the second stop valve can be automatically closed when the pressure of the mixing tank is lost or the pressure fluctuation is abnormal.
Further, the hydrogen gas source is a hydrogen generating device or a hydrogen tube bundle vehicle; the natural gas source is a natural gas pipe network.
Furthermore, the hydrogen generating device also comprises a tenth valve arranged at the output end of the hydrogen generating device or an eleventh valve arranged at the output end of the hydrogen tube bundle vehicle.
The invention utilizes the existing natural gas pipeline facilities, the pressure regulation is respectively carried out on the input hydrogen and the natural gas by arranging the hydrogen pressure regulating mechanism and the natural gas pressure regulating mechanism, the gas supply pressure of the hydrogen and the natural gas respectively meets the mixing pressure, the pressure stability of the hydrogen before the hydrogen is input into the mixing tank is ensured by the pressure stabilization of the hydrogen after the pressure regulation through the hydrogen buffer tank, the smooth operation of the natural gas and the hydrogen in the mixing tank is ensured on the basis of multiple safety guarantees, and the uniform mixing of the natural gas and the hydrogen is ensured.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural diagram of a natural gas hydrogen mixing system according to an embodiment of the present invention.
Description of reference numerals: the hydrogen gas source 1, the tenth valve 101, the eleventh valve 102, the hydrogen pressure regulating mechanism 2, the third valve 201, the fourth valve 202, the first regulating valve 203, the fifth valve 204, the hydrogen buffer tank 3, the natural gas pressure regulating mechanism 4, the sixth valve 401, the seventh valve 402, the second regulating valve 403, the eighth valve 404, the mixing tank 5, the pressure stabilizing mechanism 6, the second cut-off valve 601, the check valve 602, the ninth valve 603, the bypass pipeline 7, the first valve 701, the first cut-off valve 8, the communication pipeline 9 and the second valve 901.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, in the embodiment, a natural gas hydrogen mixing system is provided, in which a hydrogen gas source 1, a hydrogen pressure regulating mechanism 2 and a hydrogen buffer tank 3 are sequentially arranged on a hydrogen input pipeline, and the hydrogen pressure regulating mechanism 2 is used for regulating the gas supply pressure of hydrogen; the hydrogen buffer tank 3 is used for storing hydrogen and buffering and stabilizing pressure; the natural gas pressure regulating mechanism 4 is used for regulating the gas supply pressure of the natural gas; and the mixing tank 5 is connected with the tail ends of the hydrogen input pipeline and the natural gas input pipeline and is connected with a gas main pipe network, and is used for uniformly mixing the input hydrogen and the input natural gas and outputting the mixture to the gas main pipe network for transmission and distribution.
The embodiment provides a natural gas hydrogen mixing system, which utilizes the existing natural gas pipeline facility, respectively adjusts the pressure of input hydrogen and natural gas by arranging a hydrogen pressure adjusting mechanism 2 and a natural gas pressure adjusting mechanism 4 according to the pressure of a natural gas pipe network, so that the gas supply pressure of the hydrogen and the natural gas respectively meets the mixed pressure, the pressure stability of the hydrogen before the hydrogen is input into a mixing tank 5 is ensured by the pressure stabilization of the hydrogen after the pressure adjustment through a hydrogen buffer tank 3, the smooth operation of natural gas hydrogen mixing in the mixing tank 5 is ensured on the basis of multiple safety guarantees, and the uniform mixing of the natural gas and the hydrogen is ensured.
The hydrogen gas source 1 in this embodiment is a hydrogen generating device or a hydrogen tube bundle vehicle, and the natural gas source is a natural gas pipe network. Hydrogen is regarded as hydrogen source 1 by devices such as hydrogen generating device or tube bank car, and 1 pressure of hydrogen source often mismatches with natural gas system pressure, need carry out two-way regulation rear to two kinds of gas pressure and can effectively mix. The highest pressure of hydrogen stored by the tube bundle vehicle can reach 25MPa, the pressure of hydrogen produced by a hydrogen generating device such as a water electrolysis device is generally 0.6MPa, and the pressure of the hydrogen after being boosted can also reach more than 25 MPa. The highest pressure of the town gas pipe network can reach 4.0MPa, and the pressure of the long-distance pipe network is generally below 10.0MPa, so that the output pressure of hydrogen is regulated by the hydrogen pressure regulating mechanism 2 according to the pressure of the natural gas pipe network in the process of mixing the natural gas and the hydrogen so as to meet the gas mixing requirements of the natural gas pipe networks of different levels.
The natural gas hydrogen mixing system provided by the embodiment further comprises a pressure stabilizing mechanism 6 arranged between the hydrogen buffer tank 3 and the mixing tank 5. The provision of the pressure stabilizing mechanism 6 ensures the pressure stability of the hydrogen gas before the hydrogen gas is introduced into the mixing tank 5.
The natural gas hydrogen mixing system that this embodiment provided still includes bypass pipeline 7 for the output of intercommunication natural gas source and the output of blending tank 5 to and the first valve 701 of setting on bypass pipeline 7, can open first valve 701 and make the natural gas defeated gas through bypass pipeline 7 when hydrogen gas source 1 does not export hydrogen. By providing a separate bypass line 7, it is ensured that the first valve 701 is opened in the event of a failure of the hydrogen system so that natural gas can be normally distributed directly via the bypass line 7.
The natural gas hydrogen mixing system that this embodiment provided still includes the first shutoff valve 8 that sets up on the hydrogen input pipeline and be located hydrogen pressure regulating mechanism 2 front end, can be when hydrogen pressure regulating mechanism 2 trouble or hydrogen input pipeline decompression self-closing. The natural gas hydrogen mixing system can automatically close the first cut-off valve 8 when the hydrogen pressure regulating mechanism 2 breaks down or the hydrogen input pipeline loses pressure, so that the input of hydrogen is blocked, and the normal pressure of a gas main pipe network is further ensured.
The natural gas hydrogen mixing system that this embodiment provided still includes the tie pipeline 9 that is used for communicateing hydrogen source 1 and natural gas source to and set up second valve 901 on tie pipeline 9, can open second valve 901 and close other valves and realize the inner loop of hydrogen source 1 and natural gas source. Through setting up the tie pipe 9, open the second valve 901 on the tie pipe 9, realize the intercommunication inner loop of hydrogen gas source 1 and natural gas source.
The hydrogen pressure regulating mechanism 2 in this embodiment includes a first sub-pipe, a second sub-pipe, a third valve 201 disposed on the first sub-pipe, a fourth valve 202 disposed on the second sub-pipe and arranged in sequence, a first regulating valve 203, and a fifth valve 204, and the first regulating valve 203 can regulate the hydrogen gas supply pressure to the pressure threshold of the mixing tank 5. When the pressure of the hydrogen gas needs to be adjusted, the third valve 201 is closed, and the fourth valve 202 and the fifth valve 204 are opened while the opening degree of the first regulating valve 203 is adjusted to adjust the supply pressure of the hydrogen gas. When the pressure of the hydrogen gas is not required to be regulated, the third valve 201 is opened, and the fourth valve 202 and the fifth valve 204 are closed to directly realize the delivery and distribution of the hydrogen gas.
The natural gas pressure regulating mechanism 4 in this embodiment includes a third sub-pipeline and a fourth sub-pipeline connected in parallel with each other, a sixth valve 401 disposed on the third sub-pipeline, a seventh valve 402 disposed on the fourth sub-pipeline and arranged in sequence, a second regulating valve 403 and an eighth valve 404, and the second regulating valve 403 can regulate the natural gas supply pressure to the pressure threshold of the mixing tank 5. When the pressure of the natural gas needs to be regulated, the sixth valve 401 is closed, and the seventh valve 402 and the eighth valve 404 are opened while the opening degree of the second regulating valve 403 is regulated to regulate the supply pressure of the natural gas. When the pressure of the natural gas is not required to be regulated, the sixth valve 401 is opened, and the seventh valve 402 and the eighth valve 404 are closed to directly realize the distribution of the natural gas.
The pressure stabilizing mechanism 6 in the present embodiment includes a second shut-off valve 601, a check valve 602, and a ninth valve 603 provided in this order on the hydrogen gas input pipe, and the second shut-off valve 601 can be automatically closed when the pressure of the mixing tank 5 is lost or the pressure fluctuation is abnormal. When the pressure of the mixing tank 5 is lost or the pressure fluctuation is abnormal, the second cut-off valve 601 is automatically closed, and the mixing of hydrogen is interrupted; the single flow of hydrogen from the hydrogen buffer tank 3 to the mixing tank 5 can be realized by arranging the check valve 602 on the pressure stabilizing mechanism 6, and the problem that gas in the mixing tank 5 flows back to the hydrogen buffer tank 3 is avoided.
In a specific embodiment, when natural gas is mixed with hydrogen, the hydrogen tube bundle vehicle or the hydrogen generating device delivers hydrogen to the hydrogen pressure regulating mechanism 2 through a hydrogen delivery pipeline, opens the fourth valve 202 and the fifth valve 204, the ninth valve 603, the first cut-off valve 8, the second cut-off valve 601, the check valve 602, closes the first valve 701, the second valve 901, and the third valve 201, adjusts the opening degree of the first adjusting valve 203 to adjust the hydrogen pressure to be reduced from the output pressure to the mixed pressure, and the hydrogen after pressure regulation enters the hydrogen buffer tank 3 and then enters the mixing tank 5 through the second cut-off valve 601, the check valve 602, and the ninth valve 603; the natural gas is supplied by a natural gas pipe network, the seventh valve 402 and the eighth valve 404 are opened, the first valve 701, the second valve 901 and the sixth valve 401 are closed, the natural gas pressure is adjusted to be stabilized to the pressure of the mixing tank 5 by adjusting the opening degree of the second adjusting valve 403, and then the natural gas enters the mixing tank 5. The hydrogen and the natural gas are mixed in the mixing tank 5 and then output to a main fuel gas pipeline network for transmission and distribution.
When the hydrogen gas source 1 is missing, no hydrogen is mixed into the natural gas system or no hydrogen mixing is needed, the natural gas bypass pipeline 7 is started, the second valve 901, the sixth valve 401, the seventh valve 402, the eighth valve 404, the tenth valve 101 and the eleventh valve 102 are closed, the first valve 701 is opened, and the natural gas is normally transported and distributed through the bypass pipeline 7. When the system internal circulation is needed, the communication pipeline 9 between the hydrogen system and the natural gas system is opened to realize multi-channel operation, the first valve 701, the third valve 201, the fourth valve 202, the fifth valve 204, the sixth valve 401, the seventh valve 402 and the eighth valve 404 are closed, and the second valve 901 is opened to realize internal gas circulation.
The natural gas hydrogen mixing system in the embodiment has the following advantages:
1) the on-line hydrogen mixing of multiple gas sources can be realized, and the gas sources can be connected with a hydrogen generating device, a hydrogen pipe bundle vehicle and the like;
2) the on-line regulation can be realized in the process of mixing the natural gas with the hydrogen, the bidirectional mixing regulation can be realized by the hydrogen pressure regulating mechanism and the natural gas pressure regulating mechanism, the hydrogen pressure regulation is taken as the main part, and the natural gas pressure regulation is taken as the auxiliary part, so that the mixing effect is ensured;
3) a buffer tank and a pressure stabilizing mechanism are arranged in the system, and the pressure stability of the hydrogen before being input into the mixing tank can be ensured by the buffer tank and the pressure stabilizing mechanism;
4) the system is provided with a check valve, a stop valve and other protection devices, so that the gas source of the mixing device can be cut off in an accident state, and the safety of the gas mixing process is ensured.
5) The system is provided with a single bypass pipeline, so that the natural gas can be normally transported and distributed when the hydrogen system fails.
The natural gas hydrogen mixing system of the embodiment utilizes the existing natural gas pipeline facility, the hydrogen pressure regulating mechanism and the natural gas pressure regulating mechanism are arranged to respectively regulate the pressure of the input hydrogen and the input natural gas, so that the gas supply pressure of the hydrogen and the natural gas respectively meets the mixed pressure, the pressure stability of the hydrogen before the hydrogen is input into the mixing tank is ensured by the pressure stabilization of the hydrogen after the pressure regulation through the hydrogen buffer tank, the smooth operation of natural gas hydrogen mixing in the mixing tank is ensured on the basis of multiple safety guarantees, and the uniform mixing of the natural gas and the hydrogen is ensured.
In the description of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. A natural gas and hydrogen mixing system is characterized by comprising:
the hydrogen pressure regulating mechanism is used for regulating the gas supply pressure of the hydrogen; the hydrogen buffer tank is used for storing hydrogen and buffering and stabilizing pressure;
the natural gas pressure regulating mechanism is used for regulating the gas supply pressure of the natural gas;
and the mixing tank is connected with the tail ends of the hydrogen input pipeline and the natural gas input pipeline and is connected with a gas main pipe network, and is used for uniformly mixing the input hydrogen and the input natural gas and outputting the mixture to the gas main pipe network for transmission and distribution.
2. The natural gas and hydrogen mixing system according to claim 1, further comprising a pressure stabilization mechanism provided between the hydrogen buffer tank and the mixing tank.
3. The natural gas hydrogen mixing system according to claim 1, further comprising a bypass pipeline for communicating an output of the natural gas source with an output of the mixing tank, and a first valve provided on the bypass pipeline and capable of opening the first valve to allow natural gas to be delivered through the bypass pipeline when the hydrogen gas source is not outputting hydrogen gas.
4. The natural gas and hydrogen mixing system according to claim 1, further comprising a first shut-off valve disposed on the hydrogen input pipeline and located at a front end of the hydrogen pressure regulating mechanism, and capable of automatically closing when the hydrogen pressure regulating mechanism fails or the hydrogen input pipeline loses pressure.
5. The natural gas hydrogen mixing system according to claim 1, further comprising a communication pipeline for communicating the hydrogen gas source with the natural gas source, and a second valve provided on the communication pipeline, wherein the second valve can be opened and the remaining valves can be closed to realize internal circulation of the hydrogen gas source and the natural gas source.
6. The natural gas and hydrogen mixing system according to claim 1, wherein the hydrogen pressure regulating mechanism comprises a first sub-pipeline, a second sub-pipeline, a third valve, a fourth valve, a first regulating valve and a fifth valve, the first sub-pipeline and the third valve are connected in parallel, the third valve is arranged on the first sub-pipeline, the fourth valve is arranged on the second sub-pipeline, the fourth valve, the first regulating valve and the fifth valve are sequentially arranged, and the first regulating valve can regulate the hydrogen supply pressure to be the pressure threshold value of the mixing tank.
7. The natural gas and hydrogen mixing system according to claim 1, wherein the natural gas pressure regulating mechanism comprises a third sub-pipeline and a fourth sub-pipeline which are connected in parallel with each other, a sixth valve arranged on the third sub-pipeline, a seventh valve, a second regulating valve and an eighth valve which are arranged on the fourth sub-pipeline in sequence, and the second regulating valve can regulate the natural gas supply pressure to the pressure threshold value of the mixing tank.
8. The natural gas and hydrogen mixing system according to claim 2, wherein the pressure stabilizing mechanism comprises a second cut-off valve, a check valve and a ninth valve which are arranged on the hydrogen input pipeline in sequence, and the second cut-off valve can be automatically closed when the pressure of the mixing tank is lost or the pressure fluctuation is abnormal.
9. The natural gas hydrogen mixing system according to claim 1, wherein the hydrogen gas source is a hydrogen generating device or a hydrogen tube bundle vehicle; the natural gas source is a natural gas pipe network.
10. The natural gas and hydrogen mixing system according to claim 9, further comprising a tenth valve disposed at the output end of the hydrogen generating device or an eleventh valve disposed at the output end of the hydrogen bundle vehicle.
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Cited By (4)
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| CN113958871A (en) * | 2021-11-29 | 2022-01-21 | 华电郑州机械设计研究院有限公司 | Natural gas differential pressure hydrogen production and mixing device |
| CN114001278A (en) * | 2021-09-16 | 2022-02-01 | 北京市燃气集团有限责任公司 | Hydrogen-mixing gas mixing method and system for urban gas burning valve station |
| CN114877248A (en) * | 2022-05-12 | 2022-08-09 | 中国华能集团清洁能源技术研究院有限公司 | Natural gas hydrogen-loading control system and control method |
| WO2023075618A1 (en) * | 2021-10-31 | 2023-05-04 | Jerzy Jurasz | System for transporting and storing, in particular hydrogen and its mixtures |
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Application publication date: 20210914 |