A hydrogen center hydrogen pressurization system

Abstract

The application discloses a hydrogen center hydrogen pressurization system, which comprises a hydrogen buffer tank, a hydrogen compressor, a hydrogen supply pipeline, a compressor inlet pipeline, a hydrogen filling main pipeline, a hydrogen diffusion main pipeline and a hydrogen manual diffusion branch pipeline. The hydrogen pressurization system is suitable for the hydrogen center with unbalanced upstream and downstream production and sales, and can keep the system continuously and stably running under the premise that the upstream hydrogen production device (including a purification device) and the hydrogen compressor do not stop. The system can realize interlocking discharge and manual discharge when the hydrogen filling main pipeline is overpressure, and ensures the operation safety of the system. The system can match different types of hydrogen compressors, and can be integrally skived and installed to realize the functions of hydrogen buffering, hydrogen pressurization, pressure detection and overpressure discharge.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen storage and transportation, and specifically relates to a hydrogen pressurization system for a hydrogen supply center. Background Technology

[0002] In recent years, my country's hydrogen energy industry, represented by hydrogen refueling stations, has rapidly expanded, spurring demand for hydrogen and leading to the construction of numerous hydrogen production plants across the country. Currently, hydrogen tube trailers are widely used as the mainstream short-distance hydrogen transportation method in China. The hydrogen produced at the hydrogen production plants is pressurized by compressors and then added to hydrogen tube trailers at hydrogen supply centers before being transported to user terminals such as hydrogen refueling stations.

[0003] Typically, hydrogen production plants continuously produce hydrogen, while the transportation of hydrogen via long-haul trailers often results in discontinuity in time. Hydrogen supply centers, acting as intermediaries connecting hydrogen production plants and end-users, frequently face imbalances in upstream and downstream production and sales. On the other hand, for hydrogen production plants, to ensure stable hydrogen quality and operational continuity, the hydrogen production units (including hydrogen purification units) must operate continuously; for the compressors that pressurize the hydrogen, frequent start-ups and shutdowns can reduce component lifespan. Therefore, in actual production, both the hydrogen purification units and the outlet hydrogen compressors at hydrogen production plants operate continuously.

[0004] Therefore, it is necessary to develop a hydrogen pressurization system for hydrogen supply centers that is suitable for production and sales imbalances, to ensure the continuous and stable operation of hydrogen production units (including hydrogen purification units) and hydrogen compressors.

[0005] Chinese patent CN213333690U discloses a hydrogen booster device, which has multiple first branches on a main driving gas pipeline. Each first branch is equipped with a gas-driven booster pump, and each first branch can be controlled independently and activated flexibly. If a booster pump malfunctions, the third valve on that first branch is closed for maintenance, and then the third valve on another first branch is opened, and the normal operation of the gas-driven booster pumps on that first branch is not affected. This invention is not applicable to situations where there is an imbalance between upstream and downstream hydrogen production and sales in a hydrogen supply center.

[0006] Chinese patent CN205782011U discloses a hydrogen pressurization and delivery system. The system includes a hydrogen compressor, an inlet buffer tank, an outlet buffer tank, and an automatic control system. One end of the hydrogen compressor is connected to the outlet of the inlet buffer tank, and the other end is connected to the inlet of the outlet buffer tank. A solenoid valve is installed on the inlet pipe of the inlet buffer tank. The inlet buffer tank is connected to a pressure transmitter and a pressure safety valve (No. 1). The outlet buffer tank is connected to a pressure transmitter and a pressure safety valve (No. 2). The hydrogen compressor, solenoid valve, and pressure transmitters No. 1 and No. 2 are all connected to the automatic control system. This system has a simple structure, small footprint, and low cost. However, this invention is still not applicable to situations where hydrogen production and sales are unbalanced between upstream and downstream hydrogen supply centers. Utility Model Content

[0007] The purpose of this invention is to provide a hydrogen pressurization system that enables stable operation of the system without shutting down the hydrogen production unit and the hydrogen compressor, thereby solving the problem of imbalance between upstream and downstream production and sales in hydrogen supply centers.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A hydrogen pressurization system for a hydrogen supply center includes a hydrogen buffer tank, a hydrogen compressor, a hydrogen supply pipeline, a compressor inlet pipeline, a hydrogen filling main pipeline, a hydrogen venting main pipeline, and a manual hydrogen venting branch pipeline. The inlet end of the hydrogen supply pipeline is connected to the outlet of an upstream hydrogen purification unit, and the outlet end is connected to the hydrogen buffer tank. One end of the compressor inlet pipeline is connected to the outlet of the hydrogen buffer tank, and the other end is connected to the compressor inlet. The inlet end of the hydrogen filling main pipeline is connected to the compressor outlet, and the outlet end is connected to a hydrogen filling facility. The inlet end of the hydrogen venting main pipeline is connected downstream of a pressure detection remote transmission device for the hydrogen filling main pipeline, and the outlet end is connected to the hydrogen venting system. The inlet end of the manual hydrogen venting branch pipeline is connected downstream of the pressure detection remote transmission device for the hydrogen filling main pipeline, and the outlet end is connected to the hydrogen venting system.

[0010] The present invention relates to a hydrogen supply center hydrogen pressurization system, which is further characterized in that: the hydrogen supply pipeline is used to connect to an upstream hydrogen purification device to deliver hydrogen to a hydrogen buffer tank for buffering.

[0011] The present invention relates to a hydrogen supply center hydrogen pressurization system, which is further characterized in that: the compressor inlet pipeline connects the hydrogen buffer tank and the compressor inlet, and delivers hydrogen to the compressor for pressurization.

[0012] This utility model discloses a hydrogen pressurization system for a hydrogen supply center, further characterized in that: the main hydrogen filling pipeline is used to transport the pressurized hydrogen to the hydrogen filling facility, realize pressure measurement and remote transmission, and cut off the main hydrogen filling pipeline; and it is connected to the main hydrogen venting pipeline and the manual hydrogen venting branch pipeline to realize the interlocked venting or manual venting function in the case of hydrogen overpressure.

[0013] The present invention relates to a hydrogen supply center hydrogen pressurization system, which is further characterized in that: the hydrogen venting main pipeline is used for overpressure interlocking venting of the hydrogen filling main pipeline, and sends the vented hydrogen to the hydrogen venting system.

[0014] The present invention relates to a hydrogen supply center hydrogen pressurization system, which is further characterized in that: the manual hydrogen release branch pipeline is used for temporary manual release in the event of a failure of the pressure interlock regulating valve of the main hydrogen release pipeline or during temporary maintenance.

[0015] This utility model discloses a hydrogen pressurization system for a hydrogen supply center, further characterized in that: as an improved solution, a local pressure measuring device and a remote pressure measuring device are installed on the main hydrogen filling pipeline. The remote pressure measuring device is interlocked with the pressure regulating valve on the main hydrogen venting pipeline, and the interlocked pressure setpoint can be manually adjusted in conjunction with the maximum working pressure of the downstream hydrogen filling facility. The main hydrogen filling pipeline is equipped with two manual shut-off valves, one check valve, and a figure-eight blind flange to isolate it from the downstream hydrogen filling facility.

[0016] This utility model discloses a hydrogen pressurization system for a hydrogen supply center, further characterized in that: as a further improvement, a pressure interlock regulating valve is installed on the main hydrogen venting pipeline, and is interlocked with a pressure measurement remote transmission device on the main hydrogen filling pipeline. When the measured pressure value exceeds its set value, the pressure interlock regulating valve opens, and hydrogen is released into the venting system. Manual shut-off valves are installed before and after the pressure interlock regulating valve for fault diagnosis. The main hydrogen venting pipeline is equipped with a check valve, a figure-eight blind flange, and a manual shut-off valve to isolate it from the hydrogen venting system.

[0017] The present invention relates to a hydrogen pressurization system for a hydrogen supply center, further characterized in that: as a further improved solution, two manual shut-off valves and a flow-limiting orifice plate are provided on the manual hydrogen release branch pipeline for temporary manual release in the event of failure of the pressure interlock regulating valve of the main hydrogen release pipeline or temporary maintenance conditions. The two manual shut-off valves are used for reliable isolation of high-pressure hydrogen, and the flow-limiting orifice plate is used to prevent pipeline vibration caused by excessive hydrogen flow rate.

[0018] As a further improvement, the type and volume of the hydrogen buffer tank can be reasonably determined in conjunction with the compressor displacement to meet the compressor inlet buffer time requirements. When the compressor displacement is large, multiple hydrogen buffer tanks can be used in parallel.

[0019] As a further improvement, the hydrogen compressor can be skid-mounted and can be either diaphragm or liquid-driven. The type, displacement, and number of compressors can be reasonably determined based on the specific implementation project.

[0020] As a further improvement, the hydrogen pressurization system for hydrogen supply centers with unbalanced production and sales can be skid-mounted as a whole, realizing functions such as hydrogen buffering, hydrogen pressurization, pressure detection, and overpressure relief.

[0021] This utility model has the following beneficial effects:

[0022] 1) Suitable for hydrogen pressurization in hydrogen supply centers with unbalanced upstream and downstream production and sales, maintaining continuous and stable system operation without shutting down upstream hydrogen production units (including purification units) and hydrogen compressors.

[0023] 2) It can realize interlocked and manual release when the hydrogen filling main pipeline is overpressurized, ensuring the safety of system operation.

[0024] 3) When there is a hydrogen pipeline network near the hydrogen supply center, the released hydrogen can be connected to the hydrogen pipeline network and returned to the device for recycling; when the hydrogen supply center uses a dedicated hydrogen release facility (such as a hydrogen release pipe) for release, the released hydrogen can also be connected to the facility.

[0025] 4) The system can be matched with different types of hydrogen compressors. The system can be skid-mounted as a whole to realize functions such as hydrogen buffering, hydrogen pressurization, pressure detection and overpressure relief.

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of the invention. Any modifications, equivalent substitutions, and improvements made within the principles of the present invention should be included within the protection scope of the present invention. Attached Figure Description

[0027] Appendix Figure 1 This is a schematic diagram of the structure of a hydrogen supply center hydrogen pressurization system according to this utility model.

[0028] The attached diagram is labeled as follows: a-hydrogen supply pipeline, b-compressor inlet pipeline, c-hydrogen filling main pipeline, d-hydrogen venting main pipeline, e-hydrogen manual venting branch pipeline, S1-upstream hydrogen purification unit, D1-hydrogen venting system, D2-hydrogen filling facility, 1-hydrogen buffer tank, 2-hydrogen compressor, 3-local pressure detection device, 4-remote pressure detection device, 5-manual shut-off valve, 6-pressure interlock regulating valve, 7-manual shut-off valve, 8-check valve, 9-figure-eight blind flange, 10-manual shut-off valve, 11-manual shut-off valve, 12-manual shut-off valve, 13-flow limiting orifice plate, 14-manual shut-off valve, 15-check valve, 16-figure-eight blind flange, 17-manual shut-off valve. Detailed Implementation

[0029] The implementation of the technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0030] like Figure 1 As shown, the hydrogen boosting system for a hydrogen supply center with unbalanced production and sales includes a hydrogen supply pipeline a, a compressor inlet pipeline b, a hydrogen filling main pipeline c, a hydrogen venting main pipeline d, and a manual hydrogen venting branch pipeline e.

[0031] The hydrogen supply pipeline a is used to connect to the upstream hydrogen purification device S1 and deliver hydrogen to the hydrogen buffer tank 1 for buffering.

[0032] The compressor inlet pipe b connects the hydrogen buffer tank 1 and the compressor 2 inlet, and delivers hydrogen to the compressor 2 for pressurization.

[0033] The main hydrogen filling pipeline c is used to transport the pressurized hydrogen to the hydrogen filling facility D2, realize pressure measurement and remote transmission, cut-off function of the main hydrogen filling pipeline c, and connect to the main hydrogen venting pipeline d and the manual hydrogen venting branch pipeline e to realize the interlocked venting or manual venting function in the case of hydrogen overpressure.

[0034] The hydrogen venting main pipeline d is used for overpressure interlock venting of the hydrogen filling main pipeline c, and sends the vented hydrogen to the hydrogen venting system D1.

[0035] The manual hydrogen venting branch line e is used for temporary manual venting in case of failure of the pressure interlock regulating valve of the main hydrogen venting line or during temporary maintenance.

[0036] The inlet of hydrogen supply pipeline a is connected to the outlet of upstream hydrogen purification device S1, and the outlet is connected to hydrogen buffer tank 1; one end of compressor inlet pipeline b is connected to the outlet of hydrogen buffer tank 1, and the other end is connected to the inlet of compressor 2; the inlet of hydrogen filling main pipeline c is connected to the outlet of compressor 2, and the outlet is connected to hydrogen filling facility D2; the inlet of hydrogen venting main pipeline d is connected downstream of the hydrogen filling main pipeline pressure detection remote transmission device 4, and the outlet is connected to hydrogen venting system D1; the inlet of hydrogen manual venting branch pipeline e is connected downstream of the hydrogen filling main pipeline c pressure detection remote transmission device 4, and the outlet is connected to hydrogen venting system D1.

[0037] The hydrogen filling main pipeline c is equipped with a local pressure measuring device 3 and a remote pressure measuring device 4. The remote pressure measuring device 4 is interlocked with the pressure interlock regulating valve 6 on the hydrogen venting main pipeline d. The hydrogen filling main pipeline c is equipped with two manual shut-off valves 14 and 17, a check valve 15, and a figure-eight blind flange 16, which isolate it from the downstream hydrogen filling facility D2.

[0038] A pressure interlock regulating valve 6 is installed on the main hydrogen venting pipeline d, and is interlocked with the pressure measurement remote transmission device 4 on the main hydrogen filling pipeline c. When the measured pressure value is greater than its set value, the pressure interlock regulating valve 6 opens, and hydrogen is released into the venting system D1. Manual shut-off valves 5 and 7 are installed before and after the pressure interlock regulating valve 6 for fault diagnosis. The main hydrogen venting pipeline d is equipped with a check valve 8, a figure-eight blind flange 9, and a manual shut-off valve 10 to isolate it from the hydrogen venting system.

[0039] The hydrogen manual venting branch line e is equipped with two manual shut-off valves 11 and 12 and a flow-limiting orifice plate 13, which are used for temporary manual venting in case of failure of the pressure interlock regulating valve 6 on the main hydrogen venting line d or during temporary maintenance. The two manual shut-off valves 11 and 12 are used for reliable isolation of high-pressure hydrogen, and the flow-limiting orifice plate 13 is used to prevent pipeline vibration caused by excessive hydrogen flow rate.

[0040] Furthermore, the type and volume of the aforementioned hydrogen buffer tank 1 can be reasonably determined in conjunction with the displacement of the compressor 2 to meet the requirements of the inlet buffer time of the compressor 2. When the displacement of the compressor 2 is large, multiple hydrogen buffer tanks 1 can be used in parallel.

[0041] Furthermore, the aforementioned hydrogen compressor 2 can be a skid-mounted unit, and can be either a diaphragm type or a hydraulically driven type. The type, displacement, and number of compressors 2 can be reasonably determined based on the specific implementation project.

[0042] Furthermore, the aforementioned hydrogen boosting system for hydrogen supply centers with unbalanced production and sales can be skid-mounted as a whole, and can operate stably without shutting down the upstream hydrogen production unit (including the hydrogen purification unit) and the hydrogen compressor, realizing functions such as hydrogen buffering, hydrogen boosting, pressure detection and overpressure relief.

[0043] The above description is merely a typical embodiment of this utility model and does not impose any limitation on the present invention. Any changes or modifications made by those skilled in the art using the above content without departing from the scope of the technical solution of the present invention should be considered equivalent examples of equivalent changes. Any equivalent changes made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of the technical solution of the present invention.

[0044] The above are merely typical embodiments of this utility model. It should be noted that those skilled in the art can make several improvements or substitutions without departing from the principles described in this invention, and these improvements or substitutions should also be considered within the scope of protection of this invention.

Claims

1. A hydrogen pressurization system for a hydrogen supply center, comprising a hydrogen buffer tank, a hydrogen compressor, a hydrogen supply pipeline, a compressor inlet pipeline, a hydrogen filling main pipeline, a hydrogen venting main pipeline, and a manual hydrogen venting branch pipeline; the inlet end of the hydrogen supply pipeline is connected to the outlet of an upstream hydrogen purification device, and the outlet end is connected to the hydrogen buffer tank; one end of the compressor inlet pipeline is connected to the outlet of the hydrogen buffer tank, and the other end is connected to the compressor inlet; the inlet end of the hydrogen filling main pipeline is connected to the compressor outlet, and the outlet end is connected to a hydrogen filling facility; the inlet end of the hydrogen venting main pipeline is connected downstream of a pressure detection remote transmission device for the hydrogen filling main pipeline, and the outlet end is connected to the hydrogen venting system; the inlet end of the manual hydrogen venting branch pipeline is connected downstream of the pressure detection remote transmission device for the hydrogen filling main pipeline, and the outlet end is connected to the hydrogen venting system.

2. The booster system according to claim 1, characterized in that: The hydrogen supply pipeline is used to connect to the upstream hydrogen purification device and deliver hydrogen to the hydrogen buffer tank for buffering.

3. The booster system according to claim 1, characterized in that: The compressor inlet pipeline connects the hydrogen buffer tank and the compressor inlet, delivering hydrogen to the compressor for pressurization.

4. The booster system according to claim 1, characterized in that: The main hydrogen filling pipeline is used to transport pressurized hydrogen to the hydrogen filling facility, realize pressure measurement and remote transmission, cut-off function of the main hydrogen filling pipeline, and connect to the main hydrogen venting pipeline and the manual hydrogen venting branch pipeline to realize the interlocked venting or manual venting function in the case of hydrogen overpressure.

5. The booster system according to claim 1, characterized in that: The hydrogen venting main pipeline is used for overpressure interlock venting of the hydrogen filling main pipeline, and to send the vented hydrogen to the hydrogen venting system.

6. The booster system according to claim 1, characterized in that: The manual hydrogen venting branch pipeline is used for temporary manual venting in case of failure of the pressure interlock regulating valve of the main hydrogen venting pipeline or during temporary maintenance.

7. The booster system according to claim 1, characterized in that: The main hydrogen filling pipeline is equipped with a local pressure measuring device and a remote pressure measuring device. The remote pressure measuring device is interlocked with the pressure regulating valve on the main hydrogen venting pipeline. The interlocked pressure setting value is manually adjusted in conjunction with the maximum working pressure of the end hydrogen filling facility. Two manual shut-off valves, one check valve, and a figure-eight blind flange are installed on the main hydrogen filling pipeline to isolate it from the downstream hydrogen filling facility.

8. The booster system according to claim 1, characterized in that: A pressure interlock regulating valve is installed on the main hydrogen venting pipeline and is interlocked with the pressure measurement remote transmission device on the main hydrogen filling pipeline. When the measured pressure value is greater than its set value, the pressure interlock regulating valve opens and hydrogen is released into the venting system. Manual shut-off valves are installed before and after the pressure interlock regulating valve for fault diagnosis and maintenance. The main hydrogen venting pipeline is equipped with a check valve, a figure-eight blind flange, and a manual shut-off valve to isolate it from the hydrogen venting system.

9. The booster system according to claim 1, characterized in that: Two manual shut-off valves and one flow-limiting orifice plate are installed on the hydrogen manual venting branch pipeline for temporary manual venting in case of failure of the pressure interlock regulating valve of the hydrogen venting main pipeline or temporary maintenance. The two manual shut-off valves are used for reliable isolation of high-pressure hydrogen, and the flow-limiting orifice plate is used to prevent pipeline vibration caused by excessive hydrogen flow rate.

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