A high-pressure compression device for hydrogen refueling station
Through a multi-stage compression device, combined with traditional piston type and liquid-driven compressor, the problem that the hydrogen refueling station cannot provide high-flow high-pressure hydrogen is solved, and efficient hydrogen compression is achieved, meeting the high-pressure hydrogen demand of the hydrogen refueling station.
Patent Information
- Application Number
- CN202110685141.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-06-21
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2041-06-21
AI Technical Summary
The compressors of existing hydrogen refueling stations cannot provide high-compressed hydrogen with both large flow and high pressure at the same time. The diaphragm compressor is limited to small flow. Traditional piston compressors cannot achieve high compression ratios due to sealing technology.
Using a multi-stage compression device, combined with a traditional piston compressor and a liquid-driven compressor, the traditional piston compressor is responsible for low-pressure compression within 15Mpa, and the liquid-driven compressor is responsible for high-pressure compression within 80Mpa, and the hydrogen pressure is increased through the liquid-driven compressor. , realize the compression of high-pressure hydrogen gas in large flow rate.
It is realized that high-pressure hydrogen with large flow rate is provided to meet the demand for high-pressure hydrogen in the hydrogen refueling station, and overcome the limitations of flow rate and compression ratio in the prior art.
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Figure CN113446518B_ABST
Abstract
Description
Technical field:
[0001] The present invention relates to the technical field of hydrogen refueling stations, and in particular to a high-pressure compression device for a hydrogen refueling station. Background technology:
[0002] As the country vigorously develops clean energy, people's demand for high-pressure hydrogen is increasing, and the daily hydrogen refueling capacity of hydrogen refueling stations is increasing. This requires compressors to be able to provide a large flow of high-pressure compressed hydrogen to meet the increasing demand.
[0003] At present, most of the compressors used in hydrogen refueling stations are diaphragm compressors. Diaphragm compressors can be completely oil-free and have a very high compression ratio. However, due to technical and material limitations, the flow rate of diaphragm compressors can only be within a small flow range and cannot provide a large flow of high-pressure compressed hydrogen. Although traditional piston compressors can achieve a large flow rate, they are limited by sealing technology and cannot achieve a high compression ratio.
[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention:
[0005] The object of the present invention is to provide a high-pressure compression device for a hydrogen refueling station, thereby overcoming the above-mentioned defects in the prior art.
[0006] To achieve the above-mentioned purpose, the present invention provides a high-pressure compression device for a hydrogen refueling station, comprising a low-pressure hydrogen inlet pipeline and a high-pressure hydrogen outlet pipeline, and also comprising at least one group of low-pressure hydrogen compression devices, the first group of low-pressure hydrogen compression devices is the first group of low-pressure hydrogen compression devices, the last group of low-pressure hydrogen compression devices is the last group of low-pressure hydrogen compression devices, a liquid-driven compressor and a liquid-driven compressor air inlet pipeline and a liquid-driven compressor exhaust pipeline arranged thereon; the first group of low-pressure hydrogen compression devices is connected to the low-pressure hydrogen inlet pipeline; the liquid-driven compressor exhaust pipeline is connected to the high-pressure hydrogen outlet pipeline; pipelines are provided between each group of low-pressure hydrogen compression devices and between the last group of low-pressure hydrogen compression devices and the liquid-driven compressor air inlet pipeline; the low-pressure hydrogen compression device comprises a traditional piston compressor and a gas cooler arranged thereon, which is responsible for compressing hydrogen in the low-pressure compression section within 15Mpa; the liquid-driven compressor is responsible for compressing hydrogen in the high-pressure compression section within 80Mpa.
[0007] Furthermore, an air intake valve is provided on the low-pressure hydrogen inlet pipeline; a gas outlet cooler, a gas filter, an outlet pipeline check valve and a high-pressure pipeline outlet valve are provided in sequence on the high-pressure hydrogen discharge pipeline; a gas filter, a check valve, a control valve and a liquid-driven compressor inlet buffer are provided in sequence on the pipeline between the liquid-driven compressor air intake pipeline and the last group of low-pressure stage hydrogen compression devices.
[0008] Furthermore, an air intake buffer tank is provided on the first group of low-pressure hydrogen compression devices, and the air intake buffer tank is connected to the low-pressure hydrogen intake pipeline; return air pipelines are provided on the pipelines between each group of low-pressure hydrogen compression devices and on the pipeline between the last group of low-pressure hydrogen compression devices and the liquid-driven compressor intake pipeline, and loop main pipes of each level are set, and the loop main pipes of each level connect the return air pipelines to the air intake buffer tank.
[0009] Furthermore, a one-way valve and a control valve are sequentially arranged on the air return pipeline.
[0010] Furthermore, a one-way valve, a throttle valve and a regulating valve are sequentially arranged on the return air pipeline.
[0011] Furthermore, a high-pressure external hydrogen supply interface is provided on the pipeline between the last low-pressure stage hydrogen compression device and the liquid-driven compressor inlet pipeline, and a control valve is provided on the high-pressure external hydrogen supply interface.
[0012] Furthermore, a safety valve discharge pipeline is provided on the pipelines between the low-pressure hydrogen compression devices and on the pipeline between the last group of low-pressure hydrogen compression devices and the air inlet pipeline of the liquid-driven compressor.
[0013] Furthermore, a hydraulic station is also included.
[0014] Furthermore, the piston of the liquid-driven compressor is driven by high-pressure oil provided by a hydraulic station.
[0015] Furthermore, the hydraulic station is provided with an oil cooler.
[0016] Compared with the prior art, the present invention sets one or more low-pressure hydrogen compression devices composed of traditional piston compressors and gas coolers to compress hydrogen in the low-pressure compression section within 15Mpa, and also sets a liquid-driven compressor to compress hydrogen in the high-pressure compression section within 80Mpa. The flow rate of the traditional piston compressor used in the low-pressure compression section can be very large. After compression, the volume of the medium is greatly reduced, and then a small-flow liquid-driven compressor is used to increase the pressure to achieve the purpose of high-flow and high-pressure compressed hydrogen. It can be seen that the present invention can provide a large flow of high-pressure compressed hydrogen, which perfectly solves the demand for large-flow and high-pressure hydrogen processing in hydrogen refueling stations. Description of the drawings:
[0017] Figure 1 It is a structural schematic diagram of the present invention;
[0018] The accompanying drawings are marked as follows: 1-intake valve, 2-pipeline, 3-intake buffer tank, 4-traditional piston compressor, 5-gas cooler, 6-pressure gauge, 7-main circuits at all levels, 8-return air pipeline, 9-check valve, 10-control valve, 11-regulating valve, 12-throttle valve, 13-safety valve discharge pipeline, 14-high-pressure external hydrogen supply interface, 15-gas filter, 16-liquid-driven compressor intake pipeline, 17-liquid-driven compressor exhaust pipeline, 18-liquid-driven compressor, 19-gas outlet cooler, 20-export pipeline check valve, 21-high-pressure pipeline outlet valve, 22-oil cooler, 23-hydraulic station, 24-liquid-driven compressor inlet buffer, 25-high-pressure hydrogen discharge pipeline, 26-low-pressure hydrogen inlet pipeline. Specific implementation method:
[0019] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.
[0020] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.
[0021] like Figure 1 As shown, a high-pressure compression device for a hydrogen refueling station adopts a multi-stage compression method for low-pressure hydrogen. Specifically, a low-pressure hydrogen compression device is composed of a traditional piston compressor 4 and a gas cooler 5 connected thereto for cooling the compressed hydrogen. At least one group of low-pressure hydrogen compression devices is provided, and generally 4 groups are provided. Each group of low-pressure hydrogen compression devices is connected together by a pipeline 2, and is responsible for compressing hydrogen within 15Mpa; a liquid-driven compressor 18 and a liquid-driven compressor air intake pipeline 16 and a liquid-driven compressor exhaust pipeline 17 connected to the liquid-driven compressor 18 are also provided. The low-pressure hydrogen compression device is connected to the liquid-driven compressor air intake pipeline 16 by a pipeline 2, and the liquid-driven compressor 18 is responsible for compressing hydrogen within 80Mpa.
[0022] When the compressors at each level are over-pressured, return air is required to reduce the air pressure to ensure the safety and stability of the system. At the same time, in order to reduce the starting current of the motor when the compressor of the next level is started and protect the motor, a return air pipeline 8 is provided on the pipeline 2 between the low-pressure hydrogen compression devices at each level, and on the pipeline 2 between the low-pressure hydrogen compression device and the air intake pipeline 16 of the liquid drive compressor. A check valve 9 and a control valve 10 are provided in sequence on the return air pipeline 8 at the slightly lower air pressure end, and a regulating valve 11, a throttle valve 12, and a check valve 9 are provided in sequence on the return air pipeline 8 at the slightly higher air pressure section. The check valve 9 is provided to prevent the high-pressure gas from escaping (backflowing) into the low-pressure gas pipeline, and the throttle valve 12 is provided to reduce the return pressure.
[0023] An intake buffer tank 3 is provided on the intake end of the low-pressure hydrogen compression device, and each group of return air pipelines 8 are gathered to the main pipes 7 of each level of the loop and introduced into the intake buffer tank 3. In this way, the high-pressure gas in each circuit is gathered into the buffer tank 3 through the return air pipeline 8 after being reduced in pressure, so as to recover the gas, reduce the fluctuation of the intake pressure, and protect the low-pressure hydrogen compression device.
[0024] A low-pressure hydrogen intake pipeline 26 is provided which is connected to the intake buffer tank 3, through which the low-pressure hydrogen enters the compression device. In order to control the entry of the low-pressure hydrogen, an intake valve 1 is provided thereon.
[0025] A gas filter 15, a one-way valve 9, and a control valve 10 are sequentially arranged on the pipeline 2 leading to the liquid-driven compressor inlet pipeline 16 of the low-pressure hydrogen compression device. The gas filter 15 filters impurities in the hydrogen. In order to meet the needs of different sources of hydrogen in the gas filling station, a high-pressure external hydrogen supply interface 14 and a control valve 10 are also arranged after the control valve 10. A liquid-driven compressor inlet buffer 24 is arranged in front of the liquid-driven compressor inlet pipeline 16. The liquid-driven compressor inlet buffer 24 controls the fluctuation of gas pressure and plays a role in stabilizing pressure.
[0026] Finally, a high-pressure hydrogen gas discharge pipeline 25 connected to the exhaust pipeline 17 of the liquid drive compressor is provided. After the hydrogen is compressed by the low-pressure hydrogen compression device, it is compressed by the liquid drive compressor 18 and discharged from the high-pressure hydrogen gas discharge pipeline 25. In order to reduce the temperature of the high-pressure hydrogen gas, a gas outlet cooler 19 is provided on the high-pressure hydrogen gas discharge pipeline 25. In order to reduce the impurities of the high-pressure hydrogen gas, a gas filter 15 is provided on the high-pressure hydrogen gas discharge pipeline 25. In order to prevent the high-pressure gas from backflowing, an outlet pipeline check valve 20 is provided on the high-pressure hydrogen gas discharge pipeline 25, and a high-pressure pipeline outlet valve 21 is provided to control the discharge of the high-pressure hydrogen gas.
[0027] In order to ensure the safety of the entire system, a safety valve discharge pipeline 13 is provided on the low-pressure hydrogen compression device connecting pipeline 2 and the high-pressure hydrogen discharge pipeline 25 to communicate with each other to deal with system abnormalities.
[0028] In order to conveniently obtain the system pressure, pressure gauges 6 are provided on the low-pressure hydrogen inlet pipeline 26 , the high-pressure hydrogen outlet pipeline 25 , and the pipeline 2 connected to the liquid drive compressor inlet pipeline 16 .
[0029] The piston of the liquid-driven compressor 18 used in this embodiment is driven by high-pressure oil provided by the hydraulic station 23 to compress the gas and increase the pressure. An oil cooler 22 is arranged on the oil pipeline, and the hydraulic oil is cooled by air.
[0030] The foregoing description of specific exemplary embodiments of the invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the invention to the precise form disclosed, and it is clear that many changes and variations can be made in accordance with the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the invention and various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.
Claims
1. A high-pressure compression device for a hydrogen refueling station, comprising a low-pressure hydrogen inlet pipeline (26) and a high-pressure hydrogen outlet pipeline (25), characterized in that: It also includes at least one group of low-pressure hydrogen compression devices, the first group of low-pressure hydrogen compression devices is the first group of low-pressure hydrogen compression devices, the last group of low-pressure hydrogen compression devices is the last group of low-pressure hydrogen compression devices, a liquid-driven compressor (18) and a liquid-driven compressor air inlet pipeline (16) and a liquid-driven compressor air exhaust pipeline (17) arranged thereon; the first group of low-pressure hydrogen compression devices is connected to the low-pressure hydrogen inlet pipeline (26); the liquid-driven compressor air exhaust pipeline (17) is connected to the high-pressure hydrogen exhaust pipeline (25); each group of low-pressure hydrogen compression devices A pipeline (2) is provided between the low-pressure hydrogen compression device and the last low-pressure hydrogen compression device and the liquid-driven compressor inlet pipeline (16); the low-pressure hydrogen compression device includes a conventional piston compressor (4) and a gas cooler (5) arranged thereon, which is responsible for compressing the low-pressure compression section hydrogen within 15 MPa; the liquid-driven compressor (18) is responsible for compressing the high-pressure compression section hydrogen within 80 MPa; the low-pressure hydrogen inlet pipeline (26) is provided with an inlet valve (1); the high-pressure hydrogen outlet pipeline (25) is provided with gas outlet valves (26) and gas outlet valves (26) in sequence. The invention relates to a liquid-driven compressor having an inlet cooler (19), a gas filter (15), an outlet pipeline check valve (20) and a high-pressure pipeline outlet valve (21); a gas filter (15), a check valve (9), a control valve (10) and a liquid-driven compressor inlet buffer (24) are sequentially arranged on the pipeline (2) between the liquid-driven compressor inlet pipeline (16) and the last low-pressure hydrogen compression device; an inlet buffer tank (3) is arranged on the first low-pressure hydrogen compression device, and the inlet buffer tank (3) is connected to the low-pressure hydrogen inlet pipeline (26); and a gas filter (15), a check valve (9), a control valve (10) and a liquid-driven compressor inlet buffer (24) are sequentially arranged on the pipeline (2) between the liquid-driven compressor inlet pipeline (16) and the last low-pressure hydrogen compression device. A return air pipeline (8) is provided on the pipeline (2) between the compression devices and the pipeline (2) between the last low-pressure hydrogen compression device and the liquid-driven compressor intake pipeline (16), and a circuit main pipe (7) of each level is provided. The circuit main pipe (7) of each level connects the return air pipeline (8) to the intake buffer tank (3); a check valve (9) and a control valve (10) are provided in sequence on the return air pipeline (8) at the lower pressure end; and a check valve (9), a throttle valve (12) and a regulating valve (11) are provided in sequence on the return air pipeline (8) at the higher pressure end.
2. A high-pressure compression device for a hydrogen refueling station according to claim 1, characterized in that: A high-pressure external hydrogen supply interface (14) is provided on the pipeline (2) between the last low-pressure hydrogen compression device and the liquid-driven compressor air inlet pipeline (16), and a control valve (10) is provided on the high-pressure external hydrogen supply interface (14).
3. A high-pressure compression device for a hydrogen refueling station according to claim 1, characterized in that: A safety valve discharge pipeline (13) is provided on the pipeline (2) between the low-pressure hydrogen compression devices and on the pipeline (2) between the last set of low-pressure hydrogen compression devices and the liquid-driven compressor air inlet pipeline (16).
4. A high-pressure compression device for a hydrogen refueling station according to any one of claims 1 to 3, characterized in that: It also includes a hydraulic station (23).
5. A high-pressure compression device for a hydrogen refueling station according to claim 4, characterized in that: The piston of the liquid-driven compressor (18) is driven by high-pressure oil provided by a hydraulic station (23).
6. A high-pressure compression device for a hydrogen refueling station according to claim 4, characterized in that: The hydraulic station (23) is provided with an oil cooler (22).