Device for producing and storing hydrogen

Abstract

The utility model relates to the field of energy preparation and storage, and discloses a device for hydrogen production and hydrogen storage, which comprises a sewage treatment system (7) for purifying produced water from an oil and gas field; the water electrolysis hydrogen production system (9) is used for electrolyzing the purified water from the sewage treatment system (7) to obtain hydrogen; and the underground salt cavern (14) is used for storing hydrogen from the water electrolysis hydrogen production system (9). According to the device, co-production hydrogen production and hydrogen storage of the underground salt cavern and the oil and gas field are achieved, meanwhile, the problem of oil and gas field produced water treatment and the problem of hydrogen source of underground salt cavern hydrogen storage are solved, efficient utilization of water resources is achieved, the output cost after sewage treatment is saved, and the underground salt cavern hydrogen storage bank can be used for emergency peak regulation of the hydrogen market. In the hydrogen using peak period, hydrogen can be rapidly extracted, a hydrogen using notch is filled, and stable supply of hydrogen is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of energy preparation and storage, and in particular to a device for producing and storing hydrogen. Background Art

[0002] At present, my country's onshore oil fields have gradually entered the high water content period in the middle and late stages of development, with a water content of more than 90%. The produced water is generally reinjected into the reservoir. However, for some reservoirs, such as natural gas and shale gas fields, the produced water cannot be reinjected. It can only be treated as sewage and become reclaimed water for industrial use or discharged into rivers and seas after meeting the discharge standards, which cannot achieve efficient use of water resources.

[0003] In addition, today, underground salt cavern hydrogen storage has become a favorable choice for large-scale energy storage due to its many advantages, including high injection and production capacity, low manufacturing cost and high safety. Among them, underground salt caverns are underground caves formed by controlling the dissolution of salt rock by injecting water in underground salt layers or salt domes using water-soluble mining. However, underground salt cavern hydrogen storage currently has the problem of the source of hydrogen, and cannot achieve low-cost, large-scale hydrogen storage. Utility Model Content

[0004] The purpose of the utility model is to solve the problem of oil and gas field produced water treatment and the problem of hydrogen source for underground salt cavern hydrogen storage existing in the prior art.

[0005] In order to achieve the above object, the utility model provides a device for producing and storing hydrogen, the device comprising:

[0006] A sewage treatment system for purifying produced water from oil and gas fields;

[0007] a water electrolysis hydrogen production system, the water electrolysis hydrogen production system being used to electrolyze purified water from the sewage treatment system to obtain hydrogen; and

[0008] An underground salt cavern is used to store hydrogen from the water electrolysis hydrogen production system.

[0009] Optionally, the device further comprises a hydrogen injection and production system, which is connected between the water electrolysis hydrogen production system and the underground salt cavern and is used for injecting hydrogen from the water electrolysis hydrogen production system into the underground salt cavern.

[0010] Optionally, the hydrogen injection and production system is also used to produce hydrogen in the underground salt cavern to supply it to a hydrogen user.

[0011] Optionally, the hydrogen injection and production system includes an injection pipeline and an injection and production string, the injection and production string extends upward from the underground salt cavern to above the ground, and the injection pipeline is connected between the injection and production string and the water electrolysis hydrogen production system.

[0012] Optionally, the hydrogen injection and production system further comprises a compressor, and the compressor is used to compress the hydrogen before injecting the hydrogen into the underground salt cavern.

[0013] Optionally, the device comprises a plurality of said underground salt caverns.

[0014] Optionally, the device further comprises a renewable energy power supply system, and the renewable energy power supply system is used to supply power to the device.

[0015] Optionally, the renewable energy power supply system includes a wind power generation device and / or a photovoltaic power generation device.

[0016] Optionally, the device further comprises an oil and gas well and a three-phase separator, wherein the three-phase separator is connected to the oil and gas well and is used for performing three-phase separation on the produced fluid of the oil and gas well and discharging the separated produced water to the sewage treatment system.

[0017] Through the above technical solution, the utility model allows the produced water of the oil and gas field to be purified by the sewage treatment system, and then the purified water is electrolyzed by the water electrolysis hydrogen production system to obtain hydrogen, so that the produced water can become the source of clean energy hydrogen energy; in addition, by storing the generated hydrogen energy in underground salt caverns, efficient and large-scale storage of hydrogen energy can be achieved, solving the water source problem of underground salt cavern hydrogen storage, and being able to cope with the huge challenges brought by the volatility and intermittency of renewable energy production, making a significant contribution to net zero emissions. The device of the utility model realizes the co-production of hydrogen production and storage in underground salt caverns and oil and gas fields, while solving the problem of produced water treatment in oil and gas fields and the problem of the source of hydrogen for underground salt cavern hydrogen storage, achieving efficient utilization of water resources, and saving the cost of external transmission after sewage treatment. The underground salt cavern hydrogen storage can be used for emergency peak regulation in the hydrogen market. During the peak period of hydrogen use, rapid hydrogen production can be achieved to fill the hydrogen use gap and ensure a stable supply of hydrogen.

[0018] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic implementation modes and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0020] Figure 1 It is a structural schematic diagram of an implementation mode of the device for producing and storing hydrogen of the utility model.

[0021] Description of Reference Numerals

[0022] 1- oil and gas reservoir, 2- oil and gas well, 3- three-phase separator, 4- oil pipeline, 5- gas pipeline, 6- produced water pipeline, 7- sewage treatment system, 8- purified water pipeline, 9- water electrolysis hydrogen production system, 10- renewable energy power supply system, 101- wind power generation device, 102- photovoltaic power generation device, 11- compressor, 12- injection pipeline, 13- injection and production string, 14- underground salt cavern, 15- underground salt layer, 16- oxygen pipeline. DETAILED DESCRIPTION

[0023] The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings. The following detailed description of the embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

[0024] The utility model provides these embodiments to make the utility model thorough and complete, and to fully express the scope of the utility model to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​described in these embodiments should be interpreted as merely exemplary, rather than as limiting.

[0025] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0026] In addition, the words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0027] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0028] All terms used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0030] The utility model provides a device for producing and storing hydrogen, the device comprising:

[0031] A sewage treatment system 7, the sewage treatment system 7 is used to purify produced water from oil and gas fields;

[0032] a water electrolysis hydrogen production system 9, the water electrolysis hydrogen production system 9 is used to electrolyze purified water from the sewage treatment system 7 to obtain hydrogen; and

[0033] The underground salt cavern 14 is used to store hydrogen from the water electrolysis hydrogen production system 9 .

[0034] Through the above-mentioned technical scheme, the utility model allows the produced water of the oil and gas field to be purified by the sewage treatment system 7, and then the purified water is electrolyzed by the water electrolysis hydrogen production system 9 to obtain hydrogen, so that the produced water can become a source of clean energy hydrogen energy; in addition, by storing the generated hydrogen energy in the underground salt cavern 14, efficient and large-scale storage of hydrogen energy can be achieved, solving the water source problem of underground salt cavern hydrogen storage, coping with the huge challenges brought by the volatility and intermittency of renewable energy production, and making a significant contribution to net zero emissions.

[0035] The device of the utility model realizes the joint production and storage of hydrogen by underground salt caverns and oil and gas fields, and solves the problem of produced water treatment in oil and gas fields and the problem of the source of hydrogen for underground salt cavern hydrogen storage, thus realizing the efficient utilization of water resources and saving the cost of external transportation after sewage treatment. The underground salt cavern hydrogen storage depot can be used for emergency peak regulation in the hydrogen market. During the peak period of hydrogen consumption, rapid hydrogen production can be realized to fill the hydrogen consumption gap and ensure a stable supply of hydrogen.

[0036] In the present invention, the device may further include a hydrogen injection and production system, which is connected between the water electrolysis hydrogen production system 9 and the underground salt cavern 14, and is used to inject hydrogen from the water electrolysis hydrogen production system 9 into the underground salt cavern 14. The hydrogen injection and production system can also be used to extract hydrogen from the underground salt cavern 14 to supply it to the hydrogen use end.

[0037] In some embodiments, Figure 1 As shown, the hydrogen injection and production system includes an injection pipeline 12 and an injection and production pipe string 13. The injection and production pipe string 13 extends upward from an underground salt cavern 14 to above the ground, and the injection pipeline 12 is connected between the injection and production pipe string 13 and the water electrolysis hydrogen production system 9. A production port can be provided at the upper part of the injection and production pipe string 13 for hydrogen production. The production port can be connected to a hydrogen supply pipeline to supply the produced hydrogen to the hydrogen use end.

[0038] In some embodiments, Figure 1 As shown, the hydrogen injection and production system may further include a compressor 11 , which is used to compress the hydrogen before injecting the hydrogen into the underground salt cavern 14 .

[0039] In some embodiments, Figure 1 As shown, the device includes a plurality of underground salt caverns 14. Of course, correspondingly, each underground salt cavern 14 may correspond to a hydrogen injection and production system.

[0040] In some embodiments, the device further includes a renewable energy power supply system 10, which is used to power the entire device. By introducing the renewable energy power supply system 10, the device can achieve green and environmentally friendly construction of underground salt cavern hydrogen storage and green production of oil and gas fields. The electric energy generated by the renewable energy power supply system 10 can be used in part for the electric energy consumption of the injection and production operation of the underground salt cavern hydrogen storage, such as the injection and production of hydrogen; in part for oil and gas field production; and in part for the electrolysis of water hydrogen production system 9.

[0041] In some embodiments, see Figure 1 The renewable energy power supply system 10 includes a wind power generation device 101 and / or a photovoltaic power generation device 102 .

[0042] In the utility model, the device may also include an oil and gas well 2 and a three-phase separator 3. The three-phase separator 3 is connected to the oil and gas well 2 and is used to perform three-phase separation (i.e., separation of oil, gas and water) on the produced fluid of the oil and gas well 2. The separated oil enters the oil pipeline 4, the gas enters the gas pipeline 5, and the water enters the produced water pipeline 6, and is discharged to the sewage treatment system 7 through the produced water pipeline 6.

[0043] like Figure 1 As shown, an oil and gas well 2 extends into an oil and gas reservoir 1 , and an underground salt cavern 14 is formed in an underground salt layer 15 .

[0044] Combine the following Figure 1 The invention introduces a method for producing and storing hydrogen by combining an underground salt cavern hydrogen storage reservoir with an oil and gas field:

[0045] With the exploitation of oil fields, natural gas fields, and shale gas fields, a large amount of produced water and return fluid will be generated. These liquids enter the oil and gas wells 2 from the oil and gas reservoir 1 and flow to the ground. The liquid contains oil, gas, water, and some impurities. The liquid first enters the three-phase separator 3 on the ground and is physically separated into oil, gas, and water by gravity. The oil flows into the oil pipeline 4 and enters the metering device for external transmission, the gas flows into the gas pipeline 5 and is metered for external transmission, and the water flows into the produced water pipeline 6 and enters the sewage treatment system 7. It is purified in different treatment pools in turn to remove solid matter, acidic substances, organic matter, tiny particles, and microorganisms in the sewage to meet national or local emission standards. The purified water is transported to the electrolytic water hydrogen production system 9 by the purified water pipeline 8. After the purified water is electrolyzed, the hydrogen enters the hydrogen injection and production system, and is injected into the underground salt cavern 14 by the compressor 11 through the injection pipeline 12 and the injection and production pipe string 13, and is stored in the underground salt cavern 14. When the hydrogen supply is tight, hydrogen is extracted from the underground salt cavern 14 through the injection and production pipe 13 for peak regulation to ensure a stable supply of hydrogen; oxygen is transported through the oxygen pipeline 16 for use in industrial and medical fields.

[0046] It should be noted that the three-phase separator 3, sewage treatment system 7, water electrolysis hydrogen production system 9, and renewable energy power supply system 10 mentioned above are all existing technologies, and the improvement of the utility model is not there, so these systems will not be introduced in detail.

[0047] The utility model also provides a method for producing and storing hydrogen, the method comprising the following steps:

[0048] S1. Purify the produced water separated from the produced fluid of the oil and gas field;

[0049] S2, electrolyzing the produced water to produce hydrogen to obtain hydrogen;

[0050] S3. Inject hydrogen into the underground salt cavern 14 for storage.

[0051] In some embodiments, step S3 includes compressing the hydrogen gas before injecting it into the underground salt cavern 14 .

[0052] In some embodiments, renewable energy is used to provide the electricity required for the oil and gas field production process, the water electrolysis hydrogen production process, and the hydrogen injection and production process.

[0053] The above method provided by the utility model (i.e., the method of co-producing hydrogen production and storage by underground salt cavern hydrogen storage and oil and gas fields) utilizes the treated wastewater produced by the oil and gas fields to produce hydrogen by electrolysis and inject it into underground salt caverns for hydrogen storage, thereby realizing the efficient use of water resources and solving the problem of the source of hydrogen in underground salt caverns; at the same time, renewable energy is used to power the hydrogen production and storage process, thereby realizing the zero-carbon emission construction of underground salt cavern hydrogen storage. The underground salt cavern hydrogen storage is used for emergency peak regulation of the hydrogen market. During the peak period of hydrogen consumption, hydrogen can be quickly produced to fill the hydrogen consumption gap and ensure the smooth operation of the hydrogen market. The method process is simple and reasonable, and is low-carbon and environmentally friendly.

[0054] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0055] Although some specific embodiments of the present invention have been described in detail through examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A device for producing and storing hydrogen, characterized in that: The device comprises: A sewage treatment system (7), the sewage treatment system (7) being used for purifying produced water from an oil and gas field; a water electrolysis hydrogen production system (9), the water electrolysis hydrogen production system (9) being used to electrolyze purified water from the sewage treatment system (7) to obtain hydrogen; and An underground salt cavern (14), wherein the underground salt cavern (14) is used to store hydrogen from the water electrolysis hydrogen production system (9).

2. The device for producing and storing hydrogen according to claim 1, characterized in that: The device also includes a hydrogen injection system, which is connected between the water electrolysis hydrogen production system (9) and the underground salt cavern (14) and is used to inject hydrogen from the water electrolysis hydrogen production system (9) into the underground salt cavern (14).

3. The device for producing and storing hydrogen according to claim 2, characterized in that: The hydrogen injection and production system is also used to produce hydrogen in the underground salt cavern (14) to supply it to the hydrogen user.

4. The device for producing and storing hydrogen according to claim 2, characterized in that: The hydrogen injection and production system comprises an injection pipeline (12) and an injection and production pipe string (13), wherein the injection and production pipe string (13) extends upward from the underground salt cavern (14) to above the ground, and the injection pipeline (12) is connected between the injection and production pipe string (13) and the water electrolysis hydrogen production system (9).

5. The device for producing and storing hydrogen according to claim 4, characterized in that: The hydrogen injection and production system further comprises a compressor (11), wherein the compressor (11) is used to compress the hydrogen before injecting the hydrogen into the underground salt cavern (14).

6. The device for producing and storing hydrogen according to claim 1, characterized in that: The device comprises a plurality of said underground salt caverns (14).

7. The device for producing and storing hydrogen according to claim 1, characterized in that: The device further comprises a renewable energy power supply system (10), wherein the renewable energy power supply system (10) is used to supply power to the device.

8. The device for producing and storing hydrogen according to claim 7, characterized in that: The renewable energy power supply system (10) comprises a wind power generation device (101) and / or a photovoltaic power generation device (102).

9. The device for producing and storing hydrogen according to any one of claims 1 to 8, characterized in that: The device also includes an oil and gas well (2) and a three-phase separator (3), wherein the three-phase separator (3) is connected to the oil and gas well (2) and is used to perform three-phase separation on the produced fluid of the oil and gas well (2) and discharge the separated produced water to the sewage treatment system (7).

Images