A hydrogen refueling station system that complements on-site hydrogen production with externally purchased hydrogen

Abstract

The present invention discloses a hydrogen refueling station system in which on-site hydrogen production and externally purchased hydrogen are complementary, which includes an external hydrogen supply device, an on-site hydrogen production device, a hydrogen supply main road, a hydrogen supply branch road and a pressure regulating branch road, wherein the external hydrogen supply device is connected to the hydrogen supply main road, and the hydrogen supply main road is provided with a first valve, a first compressor and a hydrogen refueling device in sequence; one end of the hydrogen supply branch road is connected to the on-site hydrogen production device, and the other end is connected to the hydrogen supply main road, and a second compressor is provided on the hydrogen supply branch road. In the present invention, by providing the pressure regulating branch road and providing the second compressor on the hydrogen supply branch road, the low-pressure hydrogen produced by the external hydrogen supply device or the on-site hydrogen production device is first passed into the second compressor for pressurization and then passed into the first compressor for pressurization, so as to reduce the compression ratio of the first compressor during pressurization, avoid excessive compression ratio of the compressor causing excessive load on the compressor, and ensure stable and efficient operation of the hydrogen refueling station.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogenation, and in particular to a hydrogenation station system for complementing on-site hydrogen production with externally purchased hydrogen. Background Art

[0002] As a link between the transformation, transmission and integration of many primary energies, hydrogen energy is the key to achieving net zero carbon dioxide emissions. At the same time, as an ideal energy storage medium, hydrogen energy can not only support the large-scale development of renewable energy and achieve deep decarbonization of terminals, but also help enrich my country's energy structure and ensure energy security. At present, the application of hydrogen energy mainly refers to its use in the field of transportation. As a downstream link in the hydrogen energy industry chain, hydrogen refueling stations are the key to ensuring the development of the hydrogen fuel cell vehicle industry and achieving zero carbon emissions at the terminal.

[0003] From the perspective of the industrial chain, the first thing that needs to be solved in the operation of hydrogen refueling stations is the hydrogen source problem. Hydrogen is a secondary energy source, mainly produced from chemical plants, hydrogen production plants or renewable energy in remote areas, and hydrogen refueling stations are generally located in cities. The use of long-tube trailers to transport high-pressure hydrogen will pose certain safety risks to urban safety. Therefore, major cities have begun to try to use on-site water electrolysis to produce hydrogen as a hydrogen source. However, due to the price of municipal electricity, generally only valley electricity is used to produce hydrogen. Valley electricity hydrogen production has certain requirements for the site, and at the same time, it cannot meet downstream demand during the maintenance of the device. Therefore, on-site water electrolysis + purchased hydrogen is an effective way to ensure the hydrogen source of hydrogen refueling stations. At present, hydrogen refueling stations are mainly refueled with high-pressure hydrogen, and the core key equipment is a high-pressure compressor. The low-pressure hydrogen needs to be pressurized to high-pressure hydrogen for refueling through a high-pressure compressor. In the current hydrogen refueling station system, the hydrogen pressure at the compressor inlet is too low, resulting in an overly high compression ratio of the compressor, and further causing the compressor load to be too high. The too high compression ratio will also cause the pressurized hydrogen temperature to be too high, which can easily cause damage to the head material. In addition, the excessively high temperature will also cause the cooling load of the first cooling water unit at the rear end of the compressor to be too high, which is not conducive to reducing energy consumption and ensuring the stable and efficient operation of the hydrogen refueling station.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] The technical problem to be solved by the present invention is that, in view of the deficiencies in the prior art, a hydrogen refueling station system is provided that complements on-site hydrogen production with externally purchased hydrogen, so as to solve the problem in the prior art that the compression ratio of the compressor is too high due to the low pressure of hydrogen introduced into the high-pressure compressor, which further leads to excessive load on the compressor and easy damage to the compressor.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] A hydrogen refueling station system in which on-site hydrogen production and purchased hydrogen complement each other, comprising an external hydrogen supply device, an on-site hydrogen production device, a hydrogen supply main road, a hydrogen supply branch road and a pressure regulating branch road, wherein the external hydrogen supply device is connected to the hydrogen supply main road, and the hydrogen supply main road is sequentially provided with a first valve, a first compressor and a hydrogen refueling device, the first compressor being used for pressurizing hydrogen to a first pressure value; one end of the hydrogen supply branch road is connected to the on-site hydrogen production device, and the other end is connected to the hydrogen supply main road and is located between the first valve and the first compressor, and a second compressor is provided on the hydrogen supply branch road, one end of the pressure regulating branch road is connected to the external hydrogen supply device, and the other end is connected to the inlet of the second compressor; the outlet of the on-site hydrogen production device is connected to the inlet of the second compressor, the first compressor is used for pressurizing hydrogen to a second pressure value, and the second pressure value is less than the first pressure value.

[0008] The hydrogen refueling station system that complements on-site hydrogen production with externally purchased hydrogen, wherein the external hydrogen supply device includes a long tube trailer and a gas unloading column, the inlet of the gas unloading column is connected to the outlet of the long tube trailer, and the outlet of the gas unloading column is connected to the main hydrogen supply line and the hydrogen supply branch line.

[0009] In the hydrogen filling station system that complements on-site hydrogen production with externally purchased hydrogen, a second valve and a pressure regulating valve are provided on the pressure regulating branch line, and the pressure regulating valve is located between the second valve and the second compressor.

[0010] The hydrogen refueling station system that complements on-site hydrogen production with externally purchased hydrogen, wherein a first cooling water unit is also provided on the main hydrogen supply line, and the inlet of the first cooling water unit is connected to the outlet of the first compressor.

[0011] The hydrogenation station system in which on-site hydrogen production and externally purchased hydrogen complement each other, wherein the hydrogenation device comprises a sequence control cabinet and a hydrogenation machine, and the sequence control cabinet is located between the first cooling water unit and the hydrogenation machine.

[0012] In the hydrogen filling station system that complements on-site hydrogen production with externally purchased hydrogen, the sequence control cabinet is connected to a first hydrogen storage tank.

[0013] The hydrogen filling station system that complements on-site hydrogen production with externally purchased hydrogen, wherein a second cooling water unit is also provided on the hydrogen supply branch, and the inlet of the second cooling water unit is connected to the outlet of the second compressor.

[0014] The hydrogen refueling station system in which on-site hydrogen production and externally purchased hydrogen complement each other is provided with a second hydrogen storage tank on the hydrogen supply branch line, and the inlet of the second hydrogen storage tank is connected to the outlet of the second cooling water unit.

[0015] The hydrogen refueling station system that complements on-site hydrogen production with externally purchased hydrogen, wherein the first pressure value is 45 MPa and the second pressure value is 20 MPa.

[0016] Beneficial effect: In the present invention, by setting the pressure regulating branch and setting the second compressor in the hydrogen supply branch, the low-pressure hydrogen in the external hydrogen supply device or the low-pressure hydrogen produced by the on-site hydrogen production device can be first introduced into the second compressor to be pressurized to the second pressure value, and then introduced into the first compressor to be pressurized to the first pressure value, so as to reduce the compression ratio of the first compressor during pressurization, avoid excessive compression ratio of the first compressor causing excessive load on the compressor, thereby increasing the life of the compressor and ensuring stable and efficient operation of the hydrogen refueling station. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a hydrogen refueling station system for complementing on-site hydrogen production with externally purchased hydrogen provided by the present invention;

[0018] The markings in the attached figure are: 1. On-site hydrogen production device; 2. External hydrogen supply device; 21. Long tube trailer; 22. Gas unloading column; 3: Main hydrogen supply line; 4. Hydrogen supply branch line; 5. First compressor; 6. Second compressor; 7. First valve; 8. Second valve; 9. Pressure regulating valve; 10. Sequential control cabinet; 11. Hydrogen filling machine; 12. First hydrogen storage tank; 13. Second hydrogen storage tank; 14. First cooling water unit; 15. Second cooling water unit; 16. Third valve; 17. Fourth valve; 18. Fifth valve; 19. Sixth valve; 20. Pressure regulating branch line. DETAILED DESCRIPTION

[0019] The present invention provides a hydrogen refueling station system that complements on-site hydrogen production with purchased hydrogen. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0021] It should also be noted that the same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] The invention is further described below by describing embodiments in conjunction with the accompanying drawings.

[0024] This embodiment provides a hydrogen refueling station system that complements on-site hydrogen production with externally purchased hydrogen. Figure 1As shown, the hydrogen refueling station system includes an external hydrogen supply device 2, a main hydrogen supply line 3 connected to the external hydrogen supply device 2, a hydrogen supply branch line 4, a pressure regulating branch line 20 and an on-site hydrogen production device 1 connected to the hydrogen supply branch line 4. The external hydrogen supply device 2 is used to provide ready-made hydrogen purchased from outside. The on-site hydrogen production device is a device for producing hydrogen on-site. For example, the on-site hydrogen production device 1 is a water electrolysis hydrogen production device, which prepares hydrogen by the principle of water electrolysis. The hydrogen provided by the external hydrogen supply device is usually purchased hydrogen, which is a secondary energy source and mainly comes from chemical plants, hydrogen production plants or renewable energy in remote areas. Hydrogen refueling stations are generally located in cities, and the transportation of high-pressure hydrogen will cause certain safety risks to urban safety. Therefore, the on-site hydrogen production device is also used in the present application to perform on-site water electrolysis to produce hydrogen as a supplement to minimize the safety risks brought by hydrogen transportation. The main hydrogen supply path 3 is provided with a first valve 7, a first compressor 5 and a hydrogenation device in sequence, wherein the first valve 7 is close to the external hydrogen supply device 2; the first valve 7 is used to open or close the main hydrogen supply path 3, and the first compressor 5 is used to pressurize the hydrogen passing through the external hydrogen supply device 2 to a first pressure value, for example, the first compressor 5 is a 45MPa compressor, and the first pressure value is 45MPa; the hydrogenation device is used to fill hydrogen into the terminal vehicle-mounted hydrogen storage bottle. One end of the hydrogen supply branch 4 is connected to the on-site hydrogen production device 1, and the other end is connected to the hydrogen supply main road 3 and is located between the first valve 7 and the first compressor 5, and a second compressor 6 is arranged on the hydrogen supply branch 4, one end of the pressure regulating branch 20 is connected to the external hydrogen supply device 2, and the other end is connected to the inlet of the second compressor 6, and the pressure regulating branch 20 is used to regulate the pressure of the hydrogen passing through the external hydrogen supply device 2, and adjust it to meet the inlet pressure range of the second compressor 6; the outlet of the on-site hydrogen production device is connected to the inlet of the second compressor 6, and the first compressor 5 is used to pressurize the passing hydrogen to a second pressure value, and the second pressure value is less than the first pressure value. For example, the second compressor 6 is a 20MPa compressor, and the hydrogen inlet pressure range of the 20MPa compressor is 1-3MPa, and the second pressure value is 20MPa.

[0025] Since the pressure of hydrogen coming out of the external hydrogen supply device 2 is usually low, and when the pressure is lower than 7MPa, in order to avoid the damage to the equipment caused by excessive compression ratio by passing hydrogen with too low pressure into the first compressor 5, the first valve 7 can be closed, so that the hydrogen with a pressure lower than 7MPa is first passed into the pressure regulating branch 20 for pressure regulation, and adjusted to 1-3MPa, and then the low-pressure hydrogen enters from the inlet of the second compressor 6, so that the low-pressure hydrogen is pressurized to 20MPa through the second compressor 6, and the hydrogen that has been pressurized to 20MPa is then passed into the first compressor 5 for pressurization to 45MPa, which can greatly reduce the damage to the equipment and extend the service life of the equipment. When the pressure of hydrogen coming out of the external hydrogen supply device 2 is higher than 7MPa, it can be directly passed into the hydrogen supply main path 3 and pressurized to 45MPa through the first compressor 5.

[0026] The hydrogen pressure produced by the on-site hydrogen production device 1 is about 1-3 MPa. The produced hydrogen is first introduced into the second compressor 6 to be pressurized to 20 MPa, and then introduced into the first compressor 5 to be pressurized to 45 MPa. Finally, the pressurized high-pressure hydrogen is filled for use.

[0027] In the present invention, by setting the pressure regulating branch 20 and setting the second compressor 6 on the hydrogen supply branch, the low-pressure hydrogen in the external hydrogen supply device 2 or the low-pressure hydrogen produced by the on-site hydrogen production device 1 can be first introduced into the second compressor 6 to be pressurized to the second pressure value, and then introduced into the first compressor 5 to be pressurized to the first pressure value, so as to reduce the compression ratio of the first compressor 5 during pressurization, avoid excessive compression ratio of the first compressor 5 causing excessive load on the compressor, thereby increasing the life of the 45MPa compressor, the core equipment of the hydrogen refueling station, reducing the use cost of the core equipment, and ensuring the stable and efficient operation of the hydrogen refueling station.

[0028] The external hydrogen supply device 2 includes a long tube trailer 21 and a gas unloading column 22, the inlet of the gas unloading column 22 is connected to the outlet of the long tube trailer 21, and the outlet of the gas unloading column 22 is connected to the hydrogen supply main path 3 and the pressure regulating branch 20. The gas unloading column 22 is used to unload the hydrogen in the long tube trailer 21 to the hydrogen supply main path 3 or the pressure regulating branch 20.

[0029] The pressure regulating branch 20 is provided with a second valve 8 and a pressure regulating valve 9, and the pressure regulating valve 9 is located between the second valve 8 and the second compressor 6; the second valve 8 is used to open or close the hydrogen supply branch 4, and the second valve 8 can be an automatic control valve, which can be automatically controlled to open or close according to the detection data of the pressure sensor in the gas unloading column 22, so as to reduce manual operation and make the use of the equipment more convenient; the pressure regulating valve 9 is used to regulate the pressure of hydrogen. Since the pressure range of hydrogen introduced into the hydrogen supply branch 4 from the long tube trailer 21 through the gas unloading column 22 is usually 1-7MPa, and the second compressor 6 is a 20MPa compressor, and the hydrogen inlet pressure range is 1-3MPa, therefore, the hydrogen introduced into the hydrogen supply branch 4 needs to first pass through the pressure regulating valve 9 to modulate the pressure of the hydrogen into the range of 1-3MPa and then be introduced into the second compressor 6 for pressurization.

[0030] The main hydrogen supply path 3 is also provided with a first cooling water unit 14 , the inlet of which is connected to the outlet of the first compressor 5 , and the first cooling water unit 14 is used to cool the high-temperature hydrogen gas that comes out of the first compressor 5 after being pressurized.

[0031] The hydrogenation device includes a sequential control cabinet 10 and a hydrogenation machine 11, wherein the sequential cabinet is located between the first cooling water unit 14 and the hydrogenation machine 11, and the sequential control cabinet 10 is connected to a first hydrogen storage tank 12, which is a 45MPa hydrogen storage tank; after the first compressor 5 pressurizes the pressurized high-temperature hydrogen and cools it through the first cooling water unit 14, the hydrogen will be passed through the sequential control cabinet 10 into the first hydrogen storage tank 12 for storage, and when there is a demand for hydrogen at the rear end, the hydrogen in the first hydrogen storage tank 12 will be passed through the sequential control cabinet 10 into the hydrogenation machine 11, and then the hydrogen will be passed into the on-board hydrogen storage bottle at the rear end through the hydrogenation machine 11. The sequential control cabinet 10 and the hydrogenation machine 11 are both commonly used equipment in this field, so the specific structures of the sequential control cabinet 10 and the hydrogenation machine 11 will not be repeated in this embodiment.

[0032] The hydrogen supply branch 4 is also provided with a second cooling water unit 15, the inlet of which is connected to the outlet of the second compressor 6, and the second cooling water unit 15 is used to cool the high-temperature hydrogen gas that comes out of the second compressor 6 after being pressurized; the hydrogen supply branch 4 is also provided with a second hydrogen storage tank 13, the inlet of which is connected to the outlet of the second cooling unit, wherein the second hydrogen storage tank 13 is a 20MPa hydrogen storage tank. The hydrogen gas that is pressurized to 20MPa by the second compressor 6 and cooled by the second cooling water unit 15 first enters the second hydrogen storage tank 13 for storage, and when the pressure in the first hydrogen storage tank 12 is lower than the preset pressure value, the second hydrogen storage tank 13 begins to vent to the first compressor 5 to be pressurized to 45MPa, and then is cooled by the first cooling water unit 14 and then passed into the sequential control cabinet 10 and then into the first storage tank for storage.

[0033] In a specific embodiment, the weight of hydrogen on board the tube trailer 21 is 380 kg and the pressure is 205 MPa. In the conventional process, the tube trailer 21 directly unloads the hydrogen into the 45 MPa compressor through the gas unloading column 22. Affected by the working pressure requirement of the compressor, that is, the gas inlet pressure of the compressor must reach above 5 MPa, the gas unloading column 22 can relieve the hydrogen pressure in the tube trailer 21 to 5 MPa at most. At this time, the amount of hydrogen unloaded is about 285 kg. By adopting the hydrogen refueling station system of the present invention, by setting the pressure regulating branch 20 and setting the second compressor 6 on the hydrogen supply branch 4, the hydrogen in the long tube trailer 21 can be depressurized to 1 MPa, and the hydrogen unloading amount is about 361 kg. Compared with the conventional process, the hydrogen unloading rate is increased by about 20%. At the same time, the transportation cost of purchased hydrogen on the market is often calculated by vehicle number. For example, based on a transportation distance of 60 kilometers, the unit cost is 40 yuan / kilometer, the single-trip transportation cost is 2,400 yuan, and the transportation cost of hydrogen is 8.42 yuan / kg. If the hydrogen refueling station system of the present invention is adopted, the transportation cost of hydrogen is reduced to 6.64 yuan / kg; therefore, while the utilization rate of hydrogen in the long tube trailer is greatly improved, the transportation cost of hydrogen is also reduced.

[0034] Furthermore, when the hydrogen pressure at the inlet of the first compressor 5 is too low, the compression ratio of the compressor will be too high, and further the load of the compressor will be too high. The compression ratio is too high, which will also cause the hydrogen temperature after pressurization to be too high, which can easily cause damage to the head material. In addition, the temperature is too high, which will also cause the cooling load of the first cooling water unit 14 at the rear end of the first compressor 5 to be too high, which is not conducive to reducing energy consumption and ensuring stable and efficient operation of the hydrogen station. For example, when the hydrogen pressure is below 7MPa, the compression ratio, theoretical outlet temperature and theoretical compression energy consumption of the 45MPa compressor are calculated based on the inlet temperature of 35°C, and compared with the inlet pressure of 20MPa. The results are shown in the following table:

[0035]

[0036]

[0037] It can be seen from the above table that when the hydrogen inlet pressure is 20MPa, the compression ratio is relatively low, the theoretical outlet temperature is low, and the corresponding compressor energy consumption is also low; when the hydrogen inlet pressure decreases from 7MPa, the compression ratio of the first compressor 5 gradually increases, the theoretical outlet temperature also gradually increases, and the corresponding compressor energy consumption also gradually increases. It can be seen that by setting the hydrogen supply branch 4 and the second compressor 6, the low-pressure hydrogen is first passed into the second compressor 6 for pressurization, and then passed into the first compressor 5 for pressurization. The compression ratio of the first compressor 5 during pressurization can be reduced, and the compression ratio of the compressor is avoided to be too high, resulting in excessive compressor load. At the same time, it also avoids the compressor outlet temperature being too high, resulting in excessive compressor load, thereby improving the life of the core equipment of the hydrogen refueling station and ensuring the stable and efficient operation of the hydrogen refueling station.

[0038] Furthermore, considering the cost of on-site hydrogen production, the on-site hydrogen production device 1 generally uses valley electricity to produce hydrogen, as the electrolysis of water to produce hydrogen mainly considers the cost of electricity.

[0039] Embodiment 1

[0040] During the off-peak period, since the electricity price is slightly lower, the main method of hydrogen production is on-site electrolysis of water, and the long tube trailer 21 does not unload gas through the gas unloading column 22; the pressure of hydrogen produced by the on-site hydrogen production device 1 is about 1-3MPa, and the temperature is about 35°C, which meets the inlet requirements of the 20MPa compressor, so the produced hydrogen is directly introduced into the second compressor 6 for pressurization to 20MPa, cooled to 30-45°C by the second cooling water unit 15, and introduced into the second hydrogen storage tank 13 for storage. When the pressure in the first hydrogen storage tank 12 is lower than the preset pressure value, the second hydrogen storage tank 13 begins to vent until the first compressor 5 is pressurized to 45MPa. After pressurization, the high-temperature hydrogen is cooled to 30°C by the first cooling water unit 14, and then introduced into the first hydrogen storage tank 12 through the sequential control cabinet 10. When there is a demand for hydrogen at the back end, the hydrogen in the first hydrogen storage tank 12 is passed into the sequential control cabinet 10, then into the hydrogen filling machine 11, and the hydrogen is injected into the terminal vehicle-mounted hydrogen storage bottle through the hydrogen filling machine 11.

[0041] Embodiment 2

[0042] During off-peak electricity periods, due to the high cost of electricity, the hydrogen station does not use the on-site hydrogen production device 1 to electrolyze water to produce hydrogen, but mainly purchases hydrogen. The long tube trailer 21 unloads gas through the gas unloading column 22. When the pressure of the unloaded hydrogen is higher than 7MPa, the second valve 8 is closed and the first valve 7 is opened. The hydrogen coming out of the outlet of the gas unloading column 22 is directly introduced into the first compressor 5 to be pressurized to 45MPa, and then directly introduced into the first hydrogen storage tank 12 through the sequential control cabinet 10 for storage after being cooled by the first cooling water unit 14. When the pressure of hydrogen discharged from the gas unloading column 22 is lower than 7MPa, the first valve 7 is closed and the second valve 8 is opened. The outlet hydrogen of the gas unloading column 22 is pressure-regulated to 1-3MPa through the pressure regulating valve 9, and then the hydrogen continues to flow into the second compressor 6 to be pressurized to 20MPa. At the same time, the pressurized high-temperature hydrogen is cooled to 30-45°C by the second cooling water unit 15, and then passed into the second hydrogen storage tank 13 for storage; when the pressure in the first hydrogen storage tank 12 is lower than the preset value, the second hydrogen storage tank 13 begins to vent to the first compressor 5 to be pressurized to 45MPa, and then is cooled by the first cooling water unit 14 and passed into the sequential control cabinet 10 and then into the first storage tank for storage. When there is a demand for hydrogen at the back end, the hydrogen in the first hydrogen storage tank 12 is passed into the sequential control cabinet 10, and then enters the hydrogenator 11, and the hydrogen is injected into the terminal vehicle-mounted hydrogen storage bottle through the hydrogenator 11.

[0043] The hydrogen supply main line 3 is also provided with a third valve 16 and a fourth valve 17, the third valve 16 is located between the first valve 7 and the first compressor 5, and the fourth valve 17 is located between the first cooling water unit 14 and the sequential control cabinet 10. Usually, the third valve 16 and the fourth valve 17 are both in a normally open state, and the third valve 16 and the fourth valve 17 need to be closed only when the first compressor 5 and / or the first cooling water unit 14 need to be repaired. The hydrogen supply branch line 4 is also provided with a fifth valve 18 and a sixth valve 19, the fifth valve 18 is located between the pressure regulating valve 9 and the second compressor 6, and the sixth valve 19 is located between the second cooling water unit 15 and the second hydrogen storage tank 12. Usually, the fifth valve 18 and the sixth valve 19 are both in a normally open state, and the fifth valve 18 and the sixth valve 19 need to be closed only when the second compressor 6 and / or the second cooling water unit 15 need to be repaired.

[0044] In summary, the present invention discloses a hydrogen refueling station system in which on-site hydrogen production and purchased hydrogen complement each other, which includes an external hydrogen supply device, an on-site hydrogen production device, a hydrogen supply main road, a hydrogen supply branch road and a pressure regulating branch road, wherein the external hydrogen supply device is connected to the hydrogen supply main road, and the hydrogen supply main road is sequentially provided with a first valve, a first compressor and a hydrogen refueling device, the first compressor is used to pressurize the hydrogen to a first pressure value; one end of the hydrogen supply branch road is connected to the on-site hydrogen production device, and the other end is connected to the hydrogen supply main road and is located between the first valve and the first compressor, and a second compressor is provided on the hydrogen supply branch road, one end of the pressure regulating branch road is connected to the external hydrogen supply device, and the other end is connected to the inlet of the second compressor; the outlet of the on-site hydrogen production device is connected to the inlet of the second compressor, the first compressor is used to pressurize the hydrogen to a second pressure value, and the second pressure value is less than the first pressure value. In the present invention, by providing the pressure regulating branch and providing the second compressor in the hydrogen supply branch, the low-pressure hydrogen in the external hydrogen supply device or the low-pressure hydrogen produced by the on-site hydrogen production device can be first introduced into the second compressor to be pressurized to the second pressure value, and then introduced into the first compressor to be pressurized to the first pressure value, so as to reduce the compression ratio of the first compressor during pressurization, avoid excessive compression ratio of the first compressor causing excessive load on the compressor, thereby improving the life of the 45MPa compressor, the core equipment of the hydrogen refueling station, and ensuring stable and efficient operation of the hydrogen refueling station.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen refueling station system that complements on-site hydrogen production with externally purchased hydrogen, characterized in that: It includes an external hydrogen supply device, an on-site hydrogen production device, a hydrogen supply main road, a hydrogen supply branch road and a pressure regulating branch road, wherein the external hydrogen supply device is connected to the hydrogen supply main road, and the hydrogen supply main road is provided with a first valve, a first compressor and a hydrogenation device in sequence, and the first compressor is used to pressurize the hydrogen to a first pressure value; one end of the hydrogen supply branch road is connected to the on-site hydrogen production device, and the other end is connected to the hydrogen supply main road and is located between the first valve and the first compressor, and a second compressor is provided on the hydrogen supply branch road, one end of the pressure regulating branch road is connected to the external hydrogen supply device, and the other end is connected to the inlet of the second compressor; the outlet of the on-site hydrogen production device is connected to the inlet of the second compressor, and the first compressor is used to pressurize the hydrogen to a second pressure value, and the second pressure value is less than the first pressure value; The hydrogen supply main circuit is also provided with a first cooling water unit, and the inlet of the first cooling water unit is connected to the outlet of the first compressor; The hydrogenation device comprises a sequence control cabinet and a hydrogenation machine, wherein the sequence control cabinet is located between the first cooling water unit and the hydrogenation machine; A third valve and a fourth valve are also provided on the main hydrogen supply line. The third valve is located between the first valve and the first compressor, and the fourth valve is located between the first cooling water unit and the sequential control cabinet, so as to close the third valve and the fourth valve when the first compressor and / or the first cooling water unit need to be repaired.

2. The hydrogen refueling station system for on-site hydrogen production and externally purchased hydrogen according to claim 1 is characterized in that: The external hydrogen supply device comprises a long tube trailer and a gas unloading column, the inlet of the gas unloading column is connected to the outlet of the long tube trailer, and the outlet of the gas unloading column is connected to the main hydrogen supply path and the branch hydrogen supply path.

3. The hydrogen refueling station system for on-site hydrogen production and externally purchased hydrogen according to claim 1 is characterized in that: The pressure regulating branch is provided with a second valve and a pressure regulating valve, and the pressure regulating valve is located between the second valve and the second compressor.

4. The hydrogen refueling station system for complementing on-site hydrogen production with externally purchased hydrogen according to claim 1 is characterized in that: The sequential control cabinet is connected to a first hydrogen storage tank.

5. The hydrogen refueling station system for complementing on-site hydrogen production with externally purchased hydrogen according to claim 1, characterized in that: The hydrogen supply branch is also provided with a second cooling water unit, and the inlet of the second cooling water unit is connected to the outlet of the second compressor.

6. The hydrogen refueling station system for complementing on-site hydrogen production with externally purchased hydrogen according to claim 5 is characterized in that: A second hydrogen storage tank is arranged on the hydrogen supply branch, and an inlet of the second hydrogen storage tank is connected to an outlet of the second cooling water unit.

7. The hydrogen refueling station system for complementing on-site hydrogen production with externally purchased hydrogen according to claim 1, characterized in that: The first pressure value is 45 MPa, and the second pressure value is 20 MPa.

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