Online monitoring and stable operation system for hydrogen storage well

Abstract

The invention discloses an online monitoring and stable operation system for a hydrogen storage well, and relates to the technical field of hydrogen storage wells. Comprising a reinforced concrete layer and a gas storage mechanism arranged on the reinforced concrete layer, the gas storage mechanism comprises an outer-layer sleeve, a hydrogen-contacting sleeve, a well mouth device, a well bottom device and a leakage-proof component, the outer-layer sleeve is fixedly arranged at the bottom of the outer wall of the reinforced concrete layer, and the hydrogen-contacting sleeve is fixedly embedded in the top of the outer wall of the reinforced concrete layer; the wellhead device is installed on the top of the outer wall of the hydrogen-contacting casing pipe. According to the online monitoring and stable operation system for the hydrogen storage well, through mutual cooperation of the outer-layer casing pipe, the hydrogen-contacting casing pipe, the well mouth device, the well bottom device, the leakage-proof component and the detection mechanism, real-time monitoring and stable operation of the high-pressure hydrogen storage well in the safe operation process are achieved, and the safe operation problem of the hydrogen storage well with the higher pressure grade is solved; the underground hydrogen storage system which is high in safety and small in occupied area is provided for construction of a hydrogen refueling station.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen gas storage wells, and particularly to an on-line monitoring and stable operation system for hydrogen gas storage wells. Background Art

[0002] With the increasing global demand for clean energy, hydrogen energy, as an efficient and clean energy carrier, is gradually becoming an important direction for energy transformation. As a key link in the hydrogen energy industry chain, the number of hydrogen refueling stations is increasing continuously to meet the hydrogen refueling needs of hydrogen energy application devices such as hydrogen fuel cell vehicles. However, traditional ground-wound hydrogen storage containers have exposed many drawbacks in the application of hydrogen refueling stations, such as large floor area and high safety hazards, which limit the layout and development of hydrogen refueling stations. Ground hydrogen storage containers not only occupy precious land resources, but also, due to their exposure to the external environment, once a safety accident such as leakage occurs, it will pose a serious threat to the surrounding environment and personnel safety.

[0003] Hydrogen gas storage wells have emerged as a new type of hydrogen storage method. Hydrogen gas storage wells adopt a design of being vertically buried underground, using the formation wrapping to provide a natural barrier, and only the wellhead device is reserved on the ground part, reducing the floor area and lowering the safety hazards. With the increase in the filling pressure of hydrogen refueling stations, higher requirements are also put forward for the storage pressure of hydrogen gas storage wells. However, the safety risks brought by high-pressure hydrogen storage also increase accordingly, such as hydrogen leakage and abnormal pressure, which will affect the safe operation of the gas storage wells. Summary of the Invention

[0004] The present invention provides an on-line monitoring and stable operation system for hydrogen gas storage wells. Through the mutual cooperation of an outer casing, a hydrogen-facing casing, a wellhead device, a bottom device, a leak-proof component, and a detection mechanism, the real-time monitoring and stable operation of the in-use safe operation process of high-pressure hydrogen gas storage wells are realized, solving the problem of the safe operation of hydrogen gas storage wells with higher pressure grades, providing a high-safety and small-footprint underground hydrogen storage system for the construction of hydrogen refueling stations. Through the detection mechanism, abnormal situations during the operation of hydrogen gas storage wells can be detected in a timely manner, and operators can be reminded to take corresponding measures through alarm signals. If the hydrogen leakage is within the safe and controllable range, it can be safely vented through the collection pipe connected to the vent main pipe. To avoid accidents and ensure the long-term stable operation of hydrogen gas storage wells.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: An on-line monitoring and stable operation system for hydrogen gas storage wells, comprising:

[0006] Reinforced concrete layer;

[0007] The gas storage mechanism is arranged on the reinforced concrete layer. The gas storage mechanism includes an outer casing, a hydrogen-exposed casing, a wellhead device, a bottom-hole device, and a leak prevention component. The outer casing is fixedly arranged at the bottom of the outer wall of the reinforced concrete layer. The hydrogen-exposed casing is fixedly embedded at the top of the outer wall of the reinforced concrete layer. The wellhead device is installed at the top of the outer wall of the hydrogen-exposed casing. The bottom-hole device is installed at the bottom of the outer wall of the hydrogen-exposed casing. The leak prevention component is arranged inside the outer casing;

[0008] The detection mechanism is arranged on the wellhead device.

[0009] Further, the leak prevention component includes a collection pipe and a sealing assembly. The collection pipe is fixedly embedded at the top of the outer wall of the reinforced concrete layer, and the bottom end of the collection pipe is located in the annular space between the hydrogen-exposed casing and the outer casing. The sealing assembly is arranged on the outer casing.

[0010] Further, the sealing assembly includes a first cement ring and a second cement ring. The first cement ring is fixedly sleeved on the outer wall of the outer casing. The second cement ring is fixedly sleeved on the outer wall of the hydrogen-exposed casing.

[0011] Further, the detection mechanism includes a hydrogen concentration sensor and a casing detection component. The hydrogen concentration sensor is fixedly arranged at the top of the collection pipe. The casing detection component is arranged on the wellhead device.

[0012] Further, the casing detection component includes a pressure sensor and a temperature sensor. The pressure sensor is fixedly arranged at the interface of the wellhead device. The temperature sensor is fixedly arranged at the interface of the wellhead device.

[0013] Further, a sealing layer is fixedly arranged at the inner wall of the outer casing near the top edge. The hydrogen-exposed casing penetrates through the top of the outer wall of the sealing layer.

[0014] The present invention provides an on-line monitoring and stable operation system for a hydrogen gas storage well. It has the following beneficial effects:

[0015] (1). Through the mutual cooperation of the outer casing, the hydrogen-exposed casing, the wellhead device, the bottom-hole device, the leak prevention component, and the detection mechanism, the on-line monitoring and stable operation system for the hydrogen gas storage well realizes the real-time monitoring and stable operation of the in-service safe operation process of the high-pressure hydrogen gas storage well, solves the problem of the safe operation of the hydrogen gas storage well with a higher pressure grade, and provides a highly safe and small-footprint underground hydrogen storage system for the construction of a hydrogen refueling station.

[0016] (2) The online monitoring and stable operation system for the hydrogen gas storage well can, through the detection mechanism, promptly detect abnormal conditions during the operation of the hydrogen gas storage well and remind the operator to take corresponding measures through alarm signals. If the hydrogen leakage is within the safe and controllable range, it can be safely vented through the collection pipe connected to the main vent pipe, avoiding the occurrence of accidents and ensuring the long-term stable operation of the hydrogen gas storage well. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the present invention.

[0018] In the figure: 1, reinforced concrete layer; 2, sealing layer; 3, outer casing; 4, hydrogen-resistant casing; 5, wellhead device; 6, bottom device; 7, collection pipe; 8, first cement ring; 9, second cement ring; 10, hydrogen concentration sensor; 11, pressure sensor; 12, temperature sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figure 1 , the present invention provides a technical solution: an online monitoring and stable operation system for a hydrogen gas storage well, including:

[0021] Reinforced concrete layer 1;

[0022] A gas storage mechanism is provided on the reinforced concrete layer 1. The gas storage mechanism includes an outer casing 3, a hydrogen-resistant casing 4, a wellhead device 5, a bottom device 6, and a leak-proof component. The outer casing 3 is fixedly arranged at the bottom of the outer wall of the reinforced concrete layer 1, the hydrogen-resistant casing 4 is fixedly embedded at the top of the outer wall of the reinforced concrete layer 1, the wellhead device 5 is installed at the top of the outer wall of the hydrogen-resistant casing 4, the bottom device 6 is installed at the bottom of the outer wall of the hydrogen-resistant casing 4, and the leak-proof component is arranged inside the outer casing 3;

[0023] A detection mechanism is provided on the hydrogen-resistant casing 4.

[0024] In this implementation: Through the gas storage mechanism on the reinforced concrete layer 1, a hydrogen gas storage well can be formed. The hydrogen gas storage well is vertically buried underground and is wrapped by the formation. Only the wellhead device 5 is on the ground surface, with small potential safety hazards and a small footprint. The hydrogen-facing casing 4 is located inside the outer casing 3. The hydrogen-facing casing 4 is in direct contact with hydrogen and is used to store and transport hydrogen. The material of the hydrogen-facing casing 4 has high strength and high-pressure resistance characteristics, which can effectively seal high-pressure hydrogen and provide the main strength to ensure the safe storage of hydrogen in the gas storage well. Through the outer casing 3, it plays an outer protection role to prevent the influence of external factors on the inside of the gas storage well. The wellhead device 5 is arranged at the wellhead of the hydrogen gas storage well and includes a wellhead flange, a sealing gasket, and a safety valve. The wellhead flange is used to connect with an external pipeline to realize the injection and extraction of hydrogen. The sealing gasket ensures the sealing performance of the connection and prevents hydrogen leakage. The safety valve automatically opens when the internal pressure of the hydrogen gas storage well exceeds the set value to release the excess pressure and ensure the safety of the gas storage well. The bottom device 6 provides support and fixation for the hydrogen-facing casing 4 and plays a sealing role through the leak-proof component. Through the detection mechanism, the hydrogen gas storage well is detected, and parameters such as hydrogen concentration, pressure, and temperature can be monitored in real time. Abnormal situations can be detected in time and an alarm can be issued, facilitating the operator to take measures to ensure the stable operation of the gas storage well.

[0025] Specifically, the leak-proof component includes a collection pipe 7 and a sealing assembly. The collection pipe 7 is fixedly embedded at the top of the outer wall of the reinforced concrete layer 1, and the bottom end of the collection pipe 7 is located in the annular space between the hydrogen-facing casing 4 and the outer casing 3. The sealing assembly is arranged on the outer casing 3.

[0026] In this embodiment: Through the collection pipe 7, when hydrogen leaks, the leaked hydrogen will enter this annular space and be collected by the collection pipe 7 to prevent hydrogen from diffusing into the external environment. Through the sealing assembly, it plays a sealing and protecting role.

[0027] Specifically, the sealing assembly includes a first cement ring 8 and a second cement ring 9. The first cement ring 8 is fixedly sleeved on the outer wall of the outer casing 3, and the second cement ring 9 is fixedly sleeved on the outer wall of the hydrogen-facing casing 4.

[0028] In this embodiment: Through the first cement ring 8 and the second cement ring 9, they are filled between the outer casing 3 and the surrounding formation. Through the solidification of the cement, the outer casing 3 is fixed in the formation and at the same time plays a sealing role to prevent external substances such as groundwater from entering the inside of the gas storage well.

[0029] Specifically, the detection mechanism includes a hydrogen concentration sensor 10 and a casing detection component. The hydrogen concentration sensor 10 is fixedly arranged at the top of the collection pipe 7, and the casing detection component is arranged on the wellhead device.

[0030] In this embodiment: The hydrogen concentration sensor 10 is used to monitor the hydrogen concentration in the collection pipe 7 in real time. When the hydrogen concentration exceeds the set threshold, an alarm signal is sent in time to remind the operator to take corresponding measures.

[0031] Specifically, the casing detection component includes a pressure sensor 11 and a temperature sensor 12. The pressure sensor 11 is fixedly arranged at the interface of the wellhead device, and the temperature sensor 12 is fixedly arranged at the interface of the wellhead device.

[0032] In this embodiment: The pressure sensor 11 is used to monitor the pressure change inside the gas storage well, and the temperature sensor 12 is used to monitor the temperature change inside the gas storage well. By monitoring the pressure and temperature in real time, abnormal conditions inside the gas storage well can be detected in time to ensure the safe operation of the gas storage well.

[0033] Specifically, a sealing layer 2 is fixedly arranged on the inner wall of the outer casing 3 near the top edge, and the hydrogen-resistant casing 4 penetrates through the top of the outer wall of the sealing layer 2.

[0034] In this embodiment: Through the sealing layer 2, the sealing performance between the hydrogen-resistant casing 4 and the outer casing 3 is further enhanced, preventing hydrogen leakage and collecting hydrogen to be connected to the vent main pipe to achieve safe venting.

[0035] During use, when the hydrogen refueling station needs to store hydrogen, hydrogen is injected into the hydrogen-resistant casing 4 of the hydrogen gas storage well through the wellhead device 5. During the hydrogen storage process, the detection mechanism monitors the operating parameters of the hydrogen gas storage well in real time. The hydrogen concentration sensor 10 monitors the hydrogen concentration in the collection pipe 7 in real time. When the hydrogen concentration exceeds the set threshold, an alarm signal is sent in time to remind the operator to take corresponding measures. The pressure sensor 11 monitors the pressure change inside the gas storage well, and the temperature sensor 12 monitors the temperature change inside the gas storage well. The operator can take measures in time according to the alarm information, adjust the hydrogen injection speed and check the safety valve to ensure the safe and stable operation of the hydrogen gas storage well.

[0036] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A hydrogen storage well online monitoring and stable operation system, characterized in that: include: Reinforced concrete layer (1); A gas storage mechanism is arranged on a reinforced concrete layer (1), the gas storage mechanism comprising an outer casing (3), a hydrogen-adjacent casing (4), a wellhead device (5), a well bottom device (6) and a leak-proof component, the outer casing (3) being fixedly arranged at the bottom of the outer wall of the reinforced concrete layer (1), the hydrogen-adjacent casing (4) being fixedly embedded at the top of the outer wall of the reinforced concrete layer (1), the wellhead device (5) being installed at the top of the outer wall of the hydrogen-adjacent casing (4), the well bottom device (6) being installed at the bottom of the outer wall of the hydrogen-adjacent casing (4), and the leak-proof component being arranged inside the outer casing (3); The detection mechanism is arranged on the hydrogen-adjacent casing (4).

2. The online monitoring and stable operation system for hydrogen storage wells according to claim 1 is characterized in that: The anti-leakage component comprises a collecting pipe (7) and a sealing assembly, wherein the collecting pipe (7) is fixedly embedded in the top of the outer wall of the reinforced concrete layer (1), and the bottom end of the collecting pipe (7) is located in the annular space between the hydrogen-containing casing (4) and the outer casing (3), and the sealing assembly is arranged on the outer casing (3).

3. The online monitoring and stable operation system for hydrogen gas storage wells according to claim 2 is characterized in that: The sealing assembly comprises a first cement ring (8) and a second cement ring (9), wherein the first cement ring (8) is fixedly sleeved on the outer wall of the outer casing (3), and the second cement ring (9) is fixedly sleeved on the outer wall of the hydrogen-containing casing (4).

4. The online monitoring and stable operation system for hydrogen storage wells according to claim 3 is characterized in that: The detection mechanism comprises a hydrogen concentration sensor (10) and a casing detection component. The hydrogen concentration sensor (10) is fixedly arranged on the top of the collection pipe (7), and the casing detection component is arranged on the wellhead device (5).

5. The online monitoring and stable operation system for hydrogen storage wells according to claim 4 is characterized in that: The casing detection component comprises a pressure sensor (11) and a temperature sensor (12); the pressure sensor (11) is fixedly arranged at an interface of a wellhead device (5); and the temperature sensor (12) is fixedly arranged at an interface of the wellhead device (5).

6. The online monitoring and stable operation system for hydrogen gas storage wells according to claim 5 is characterized in that: A sealing layer (2) is fixedly provided on the inner wall of the outer sleeve (3) near the top edge, and the hydrogen-adherent sleeve (4) passes through the top of the outer wall of the sealing layer (2).

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