A medium-pressure compressor hydrogen test center and test method

Abstract

The present invention discloses a medium-pressure compressor hydrogen test center and test method, the test center includes a deflation column connected to a test gas source, the deflation column is connected to the hydrogen inlet of valve group one, the hydrogen outlet of the direct supply circuit is connected to the air inlet of hydrogen storage bottle group one through a pipeline and valve group two, hydrogen storage bottle group one includes multiple hydrogen bottles and a hydrogen storage control pipeline system, hydrogen storage bottle group one changes the storage capacity and gas supply pressure of test hydrogen by turning on and off the valves of different pipelines in the hydrogen storage control pipeline system, the air outlet of hydrogen storage bottle group one is connected to the air inlet of each compressor to be tested through a pipeline and valve group three, the air outlet of each compressor to be tested is connected to the air inlet of hydrogen storage bottle group two through a pipeline and valve group four, and the air outlet of hydrogen storage bottle group two is connected to the air inlet of the compressor to be tested. The present invention can realize the integration of the medium-pressure compressor test process, facilitate the automated operation of the test process, enable the test hydrogen to be circulated, stored and utilized, and avoid the waste of test gas.

Description

Technical Field

[0001] The invention belongs to the technical field of compressor testing, and relates to a medium-pressure compressor hydrogen testing center and a testing method. Background Art

[0002] Currently, most hydrogen refueling stations use tube trailers as an external hydrogen supply source. The hydrogen pressure supplied by these tube trailers is generally 20 MPa, which is lower than the required filling pressure at the station. Hydrogen needs to be pressurized by a compressor and stored in tanks at the station. Compressors are a core piece of equipment at hydrogen refueling stations, with 45 MPa compressors being the most widely used. Pre-shipment testing is crucial to ensuring the reliability and safety of hydrogen refueling stations.

[0003] Currently, most tests on diaphragm compressors use nitrogen as a substitute gas for hydrogen, which has certain errors and cannot effectively test the performance parameters of the diaphragm compressor.

[0004] On the other hand, bottled gas is often used for the gas supply during diaphragm compressor testing. The gas pressure is usually customized and decreases as the gas volume decreases. It is impossible to flexibly adjust the gas supply pressure and maintain the pressure stable at 45MPa. At the same time, the use of bottled gas is not conducive to hydrogen recovery and is not conducive to further automated testing. Summary of the Invention

[0005] The purpose of the present invention is to provide a medium-pressure compressor hydrogen test center to solve the technical problems in the prior art that it is difficult to effectively realize automated testing of compressors in hydrogen refueling stations and it is difficult to ensure flexible and stable gas supply pressure during testing.

[0006] The medium-pressure compressor hydrogen test center comprises a gas relief column connected to a test gas source, a valve group 1, a valve group 2, a hydrogen storage bottle group 1, a hydrogen storage bottle group 2, a valve group 3, a valve group 4, a valve group 5 and a medium-pressure test station, wherein the valve group 1 comprises a direct supply circuit, the gas relief column is connected to the hydrogen inlet of the direct supply circuit, the hydrogen outlet of the direct supply circuit is connected to the gas inlet of the hydrogen storage bottle group 1 through a pipeline and the valve group 2, the hydrogen storage bottle group 1 comprises a plurality of hydrogen bottles and a hydrogen storage control pipeline system, and the hydrogen storage bottle group 1 is connected to the hydrogen storage bottle group 1 through the The storage capacity and gas supply pressure of the test hydrogen are changed by opening and closing the valves of different pipelines in the hydrogen storage control pipeline system. The air outlet of the hydrogen storage bottle group one is connected to the air inlet main pipe of the medium-pressure test station through the pipeline and valve group three. The air inlet main pipe is then connected to the air inlet of each compressor to be tested in the medium-pressure test station through a branch pipe. The air outlet of each compressor to be tested is connected to the air inlet of the hydrogen storage bottle group two through the pipeline and valve group four. The air outlet of the hydrogen storage bottle group two is connected to the air inlet main pipe through valve group five and the pipeline.

[0007] Preferably, the hydrogen storage cylinder group includes several gas cylinder circuits arranged in parallel, wherein the gas cylinder circuits of the hydrogen storage cylinder group one are connected in parallel between the valve group two and the valve group three, and the gas cylinder circuits of the hydrogen storage cylinder group two are connected in parallel between the valve group four and the valve group five, and each gas cylinder circuit is provided with a corresponding hydrogen cylinder and a circuit control structure; the hydrogen storage control pipeline system includes the circuit control structure, and the circuit control structure includes a safety valve, and the safety valve is provided on the pipeline of the gas cylinder circuit.

[0008] Preferably, the gas cylinder circuit includes a single-bottle circuit and a multi-bottle circuit, the single-bottle circuit has only one hydrogen cylinder, the multi-bottle circuit includes a parallel cylinder group formed by several hydrogen cylinders connected in parallel, and the parallel cylinder group is connected to the pipeline of the gas cylinder circuit; the circuit control structure includes a first control structure and a second control structure arranged on the pipeline of the gas cylinder circuit, and a control valve arranged on the pipeline at both ends of each hydrogen cylinder; in the single-bottle circuit, the hydrogen cylinder and the control valve are both arranged between the first control structure and the second control structure; in the multi-bottle circuit, the parallel cylinder group is arranged between the first control structure and the second control structure, and the control valve is provided on the pipeline at both ends of each hydrogen cylinder in the parallel cylinder group.

[0009] Preferably, the valve group four includes a recovery gas circuit and a circulation gas circuit corresponding one-to-one to the gas outlet of the compressor to be tested, the main gas outlet of the recovery gas circuit is connected to the gas inlet of the corresponding gas cylinder circuit in the hydrogen storage bottle group two, and the valve group five is provided with a ventilation circuit corresponding one-to-one to the gas cylinder circuit in the hydrogen storage bottle group two, the gas outlets of the ventilation circuits are all connected to the circulation pipeline one, the circulation pipeline one is connected to the circulation gas circuit of the valve group four, and the circulation gas circuit is connected to a gas cylinder circuit in the hydrogen storage bottle group two to realize the circulation transportation and storage of hydrogen.

[0010] Preferably, the gas cylinder loop in the hydrogen storage bottle group two connected to the circulating gas circuit is connected to the main air inlet of the branch air circuit in the valve group five, and the branch air circuit includes two pressure reducing branches provided with pressure reducing valves, one pressure reducing branch is connected to the air inlet of the valve group two through the circulating pipeline two, so that the hydrogen in the hydrogen storage bottle group two can be circulated through the valve group five and the circulating pipeline one and transported to the hydrogen storage bottle group one; the other pressure reducing branch is connected to the main air inlet pipe through the circulating pipeline three.

[0011] Preferably, the gas discharge column is connected to two hydrogen supply pipelines, namely pipeline one and pipeline two, pipeline one is directly connected to another hydrogen inlet of the direct supply circuit; pipeline two is connected to a hydrogen inlet of the direct supply circuit via a hydrogen compressor; the direct supply circuit is provided with two air inlet branches and one air outlet branch corresponding to the hydrogen inlet.

[0012] The present invention also provides a method for testing hydrogen in a medium-pressure compressor, which adopts a medium-pressure compressor hydrogen testing center as described above. The testing method includes: after the hydrogen flows out from the leak column, it is supplied to the hydrogen storage bottle group one through the direct supply circuit of the valve group one, the hydrogen storage bottle group one stably supplies gas to the outside, and the hydrogen is transported to the medium-pressure test station after passing through the valve group three to supply gas to the compressor to be tested for testing; the outlet of the compressor to be tested transports the tested hydrogen to the hydrogen storage bottle group two through the valve group four, thereby realizing the recovery and storage of hydrogen; and the hydrogen in the hydrogen storage bottle group two can also be circulated and transported to the hydrogen storage bottle group two through the valve group five and the circulation pipeline one, and the cylinder circuit in the hydrogen storage bottle group two that receives and stores the hydrogen after one cycle can continue to circulate and transport it to the hydrogen storage bottle group one and the medium-pressure test station through the pressure reducing branch of the valve group five.

[0013] Preferably, when the gas supply pressure is close to the pressure required for the test, the hydrogen flows out of the gas release column and is then transported by pipeline one through the direct supply circuit of valve group one; when the gas supply pressure is lower than the pressure required for the test, the hydrogen flows out of the gas release column and is then transported by pipeline two, pressurized by the hydrogen compressor, and then transported through the direct supply circuit of valve group one.

[0014] Preferably, when the amount of hydrogen in the test system meets the test requirements, pipeline one and pipeline two are closed, and the compressor to be tested on the medium-pressure test station provides hydrogen circulation power; the outlet of the compressor to be tested transports the tested hydrogen to the hydrogen storage bottle group two through valve group four, thereby realizing hydrogen recovery and storage; and the hydrogen in the hydrogen storage bottle group two can also be circulated and transported to the hydrogen storage bottle group two through the valve group five and the circulation pipeline one, and the cylinder circuit in the hydrogen storage bottle group two that receives and stores the hydrogen after one cycle can continue to be circulated and transported to the hydrogen storage bottle group one and the medium-pressure test station through the pressure reducing branch of valve group five.

[0015] Preferably, when the hydrogen supply pressure in some gas cylinder circuits in the hydrogen storage bottle group 2 is too high and cannot meet the requirement that the inlet pressure of the hydrogen compressor is lower than the exhaust pressure, the hydrogen is output from the hydrogen storage bottle group 2 after one cycle, and then the pressure is reduced by the pressure reducing valve of the pressure reducing branch of the valve group 5 to reduce the pressure to the required pressure value, and then the hydrogen is circulated and transported to the hydrogen storage bottle group 1 and the medium-pressure test station;

[0016] When the above-mentioned hydrogen supply pressure is too high and the hydrogen pressure cannot be reduced to the required pressure value after being reduced by the pressure reducing valve, a part of the hydrogen will be discharged through the pressure reducing branch and the vent in the hydrogen storage bottle group 2, thereby protecting the compressor to be tested in the medium-pressure compressor test station.

[0017] This invention offers the following advantages: This solution supplies gas directly from a tube trailer via a deflation column, ensuring a consistent gas source and avoiding gas shortages. The valve assembly integrates the valves required for testing processes for medium-pressure compressors such as hydrogen compressors, facilitating test operations. The hydrogen storage bottle design enhances the safety and flexibility of internal gas circulation. The loop formed by the connections between the valve assembly allows for the circulation of test hydrogen, avoiding waste of test gas.

[0018] In this solution, the inlet and outlet pressures can be adjusted through the control structure to ensure that the safety of the hydrogen storage bottle group 1 and the gas supply pressure meet the needs. This solution stores the hydrogen with a lower gas supply pressure from the long tube trailer in a gas cylinder, and the hydrogen compressor can increase the pressure of the hydrogen stored in the hydrogen storage bottle group 1, while the parallel gas cylinder circuit can ensure the stability and reliability of the test gas supply. The structure of this solution can also meet the test requirements of two or more compressors to be tested at the same time. The hydrogen compressor pressurization combined with the hydrogen storage bottle group 1 can provide a variety of gas supply pressures, thereby broadening the application scope of the test process, meeting the test requirements of hydrogen compressors with a variety of inlet and exhaust pressure parameters, and improving the versatility of the test process equipment.

[0019] Hydrogen storage bottle group one can provide the hydrogen pressure required by the 45MPa compressor, and the recovered hydrogen can be stored in another gas cylinder circuit of hydrogen storage bottle group two and hydrogen storage bottle group one through circulation after storage; if there is hydrogen with higher storage pressure in the hydrogen storage bottle group, the hydrogen pressure can be reduced and vented through the pressure reducing valve and vent port of the hydrogen storage bottle group itself and the valve group five, valve group four and other structures, thereby avoiding the test results being affected by excessively high or low hydrogen supply pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a medium-pressure compressor hydrogen test center of the present invention.

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the deflation column in the structure shown.

[0022] Figure 3 for Figure 1 Schematic diagram of the structure of the hydrogen compressor in the structure shown.

[0023] Figure 4 for Figure 1 Schematic diagram of the structure of hydrogen storage bottle group 1 in the structure shown.

[0024] Figure 5 for Figure 1 Schematic diagram of the structure of valve group 1 in the structure shown.

[0025] Figure 6 for Figure 1 Schematic diagram of the structure of valve group 2 in the structure shown.

[0026] Figure 7 for Figure 1 Schematic diagram of the structure of valve group three in the structure shown.

[0027] Figure 8 for Figure 1 Schematic diagram of the structure of valve group four in the structure shown.

[0028] Figure 9 for Figure 1 Schematic diagram of the structure of hydrogen storage bottle group 2 in the structure shown.

[0029] Figure 10 for Figure 1 Schematic diagram of the structure of valve group five in the structure shown.

[0030] Figure 11 for Figure 10 Schematic diagram of the structure of the pressure reducing valve part in the structure shown.

[0031] The reference numerals in the accompanying drawings include: 1. long tube trailer, 2. deflation column, 3. hydrogen compressor, 4. valve group one, 5. valve group two, 6. hydrogen storage bottle group one, 7. valve group three, 8. medium pressure test station, 9. compressor to be tested, 10. valve group four, 11. hydrogen storage bottle group two, 12. valve group five, 13. pipeline one, 14. pipeline two, 15. pipeline three, 16. pipeline four, 17. pipeline five, 18. pipeline six, 19. pipeline seven, 20. pipeline eight, 21. pipeline nine, 22. pipeline ten, 23. circulation pipeline one, 24. pipeline twelve, 25. pipeline thirteen, 26. hydrogen vent, 27. circulation pipeline two, 28. circulation pipeline three, 29. replacement pipeline. DETAILED DESCRIPTION

[0032] The specific implementation methods of the present invention will be further explained in detail below through the description of embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0033] like Figure 1-11As shown, the present invention discloses a medium-pressure compressor hydrogen test center, including a leak column 2 connected to a test gas source, a valve group 1 4, a valve group 2 5, a hydrogen storage bottle group 1 6, a hydrogen storage bottle group 2 11, a valve group 3 7, a valve group 4 10, a valve group 5 12 and a medium-pressure test station 8, wherein the valve group 1 4 includes a direct supply circuit, the leak column 2 is connected to the hydrogen inlet of the direct supply circuit, the hydrogen outlet of the direct supply circuit is connected to the air inlet of the hydrogen storage bottle group 1 6 through a pipeline and the valve group 2 5, the hydrogen storage bottle group 1 6 includes a plurality of hydrogen bottles and a hydrogen storage control pipeline system, the hydrogen storage bottles Group 1 6 changes the storage amount of test hydrogen by opening and closing the valves of different pipelines in the hydrogen storage control pipeline system. The air outlet of the hydrogen storage bottle group 1 6 is connected to the air inlet main pipe of the medium-pressure test station 8 through the pipeline and valve group 3 7. The air inlet main pipe is then connected to the air inlet of each compressor to be tested 9 in the medium-pressure test station 8 through a branch pipe. The air outlet of each compressor to be tested 9 is connected to the air inlet of the hydrogen storage bottle group 2 11 through the pipeline and valve group 4 10. The air outlet of the hydrogen storage bottle group 2 11 is connected to the air inlet main pipe through valve group 5 12 and the pipeline.

[0034] This solution supplies gas directly from the long tube trailer 1 through the air release column 2, thereby ensuring the source of gas and avoiding the problem of insufficient gas supply. The valve group setting realizes the integration of valves required for the test process of commonly used medium-pressure compressors such as 45MPa compressors, which facilitates the test process operation. The design of the hydrogen storage bottle group improves the safety and flexibility of the internal circulation gas, and the parallel connection of multiple gas cylinder circuits can improve the stability of the gas supply. The connection between the valve groups forms a loop leading to the medium-pressure test station 8, so that the test hydrogen can be recycled and the waste of test gas can be avoided.

[0035] The degassing column 2 is connected to two hydrogen supply pipelines, namely pipeline one 13 and pipeline two 14. The pipeline one 13 is directly connected to a hydrogen inlet of the direct supply circuit, so it is a direct supply pipeline; the pipeline two 14 is connected to another hydrogen inlet of the direct supply circuit via the hydrogen compressor 3, so it is a boost pipeline. The direct supply circuit is provided with two air inlet branches and one air outlet branch corresponding to the hydrogen inlet. In this way, the present solution can realize the supply of a variety of gas supply pressures by adding a hydrogen compressor 3 to the test process for the pressurized treatment of the test hydrogen, thereby broadening the application scope of the test process, meeting the test requirements of the hydrogen compressor 3 with a variety of inlet and exhaust pressure parameters, and improving the versatility of the test process equipment.

[0036] The hydrogen storage bottle group 1 6 is internally provided with a plurality of valves such as a safety valve and a needle valve to ensure the safety of the hydrogen supply. By opening and closing the valves of different pipelines, the storage amount of the test hydrogen can be changed, and the hydrogen circulation rate can be flexibly adjusted to meet the test requirements of hydrogen compressors 3 with different displacements. The hydrogen storage bottle group 1 6 includes several gas cylinder circuits arranged in parallel. Each gas cylinder circuit is connected in parallel between the valve group 2 5 and the valve group 3 7. Each gas cylinder circuit is provided with a corresponding hydrogen cylinder and a circuit control structure. The hydrogen storage control pipeline system includes the circuit control structure, and the circuit control structure includes several safety valves such as a safety valve and a needle valve. The safety valve is arranged on the pipeline of the gas cylinder circuit.

[0037] The gas cylinder circuit includes a single-bottle circuit and a multi-bottle circuit. The single-bottle circuit has only one hydrogen cylinder, and the multi-bottle circuit includes a parallel cylinder group formed by connecting several hydrogen cylinders in parallel. The parallel cylinder group is connected to the pipeline of the gas cylinder circuit. The circuit control structure includes a first control structure and a second control structure provided on the pipeline of the gas cylinder circuit, and a control valve provided on the pipeline at both ends of each hydrogen cylinder. In the single-bottle circuit, the hydrogen cylinder and the control valve are both provided between the first control structure and the second control structure; in the multi-bottle circuit, the parallel cylinder group is provided between the first control structure and the second control structure, and the control valve is provided on the pipeline at both ends of each hydrogen cylinder in the parallel cylinder group. The control structure can be used to adjust the inlet and outlet pressures to ensure that the safety of the hydrogen storage cylinder group 6 and the gas supply pressure meet the requirements.

[0038] The direct supply circuit of valve group 1 4 is connected to the circuit in valve group 2 5 , and the gas outlet of the circuit is connected to a gas cylinder circuit in hydrogen storage bottle group 1 6 . The gas cylinder circuit can be a multi-bottle circuit or a single-bottle circuit. The direct supply circuit of valve group 1 4 is connected to the gas inlet of valve group 2 5 , and hydrogen is transported and stored in hydrogen storage bottle group 1 6 before being transported to the medium-pressure test station 8 . The hydrogen stored in hydrogen storage bottle group 1 6 is supplied to the compressor under test 9 through valve group 3 7 to ensure stable gas supply.

[0039] An independent circuit is provided in the valve group three 7, and each circuit is provided with a corresponding valve and other control structures. The gas cylinder circuit in the hydrogen storage bottle group one 6 is connected to the corresponding air outlet through the circuit in the valve group three 7, and each air outlet of the valve group three 7 is connected to the air inlet main pipe of the medium-pressure test station 8 through a branch pipeline. The above-mentioned branch pipeline, the air inlet main pipe and the branch pipe in the medium-pressure test station 8 constitute pipeline six 18, which is used to supply hydrogen to each compressor 9 to be tested.

[0040] The valve group 4 10 includes a recovery gas circuit and a circulation gas circuit corresponding one-to-one to the gas outlet of the compressor 9 to be tested. The main gas outlet of the recovery gas circuit is connected to the gas inlet of the corresponding gas cylinder circuit in the hydrogen storage bottle group 2 11. The valve group 5 12 is provided with a ventilation circuit corresponding one-to-one to the gas cylinder circuit in the hydrogen storage bottle group 2 11. The gas outlets of the ventilation circuits are all connected to the circulation pipeline 1 23. The circulation pipeline 1 23 is connected to the circulation gas circuit of the valve group 4 10. The circulation gas circuit is connected to a gas cylinder circuit in the hydrogen storage bottle group 2 11 to realize the circulation and storage of hydrogen. Each gas cylinder circuit of the hydrogen storage bottle group 2 11 can also release hydrogen through the hydrogen vent 26 thereon to reduce the air pressure.

[0041] The gas cylinder circuit connected to the circulating gas circuit in the hydrogen storage bottle group 2 11 is connected to the main air inlet of the branch air circuit in the valve group 5 12. The branch air circuit includes two pressure-reducing branches equipped with pressure-reducing valves. One pressure-reducing branch is connected to the air inlet of the valve group 2 5 through the circulation pipeline 2 27, so that the hydrogen in the hydrogen storage bottle group 2 11 can be circulated and transported to the hydrogen storage bottle group 1 6 through the valve group 5 12 and the circulation pipeline 1 23; the other pressure-reducing branch is connected to the air inlet main pipe through the circulation pipeline 3 28, so that the hydrogen can be directly circulated and transported to the compressor 9 under test in the medium-pressure test station 8 after decompression. One of the two air inlets of the valve group 2 5 is connected to the circulation pipeline 2 27, and the other is connected to the direct supply circuit.

[0042] Using the aforementioned medium-pressure compressor hydrogen test center, the test center connects a tube trailer 1 to a deflated column 2, directly providing a test gas source. Pipeline 1 13 of deflated column 2 is connected to valve block 1 4, and pipeline 2 14 of deflated column 2 is connected to hydrogen compressor 3. The outlet of hydrogen compressor 3 is connected to valve block 1 4, which leads pipeline 2 15 to valve block 2 5. Valve block 2 5 is connected to hydrogen storage bottle group 1 6 via pipeline 4 16, which is then connected to valve block 3 7 via pipeline 5 17. The outlets of valve block 3 7 are all connected to pipeline 6 18, which in turn connects to each compressor 9 under test at the medium-pressure test station 8 through pipeline 6 18 and its branch lines. The compressors 9 to be tested are all medium-pressure compressors (i.e., 45MPa compressors). The gas outlets of the compressors 9 to be tested are connected to the corresponding two recovery gas circuits in the valve group 4 10 through the lead-out pipeline 7 19 and pipeline 8 20, and the recovery gas circuits are connected to the corresponding gas cylinder circuits in the hydrogen storage bottle group 2 11 through the corresponding pipeline 9 21. The gas cylinder circuits connected to pipeline 9 21 are connected to the corresponding gas circuits of the valve group 5 12 through pipeline 10 22. The gas outlets of the corresponding gas circuits of the valve group 5 12 are all connected to pipeline 11 (i.e., circulation pipeline 11). The circulating gas circuit is connected to the circulating gas circuit of the valve group four 10 through the pipeline twelve 24, and the cylinder circuit connected to the circulating gas circuit is connected to the branch gas circuit of the valve group five 12 through the pipeline thirteen 25. The two pressure reducing branches of the branch gas circuit are connected to the air inlet of the valve group two 5 and the air inlet main pipe of the medium pressure test station 8 through the pipeline fourteen (i.e., the circulating gas circuit two 27) and the pipeline fifteen (i.e., the circulating gas circuit three 28).

[0043] In this way, not only can hydrogen be stored through the hydrogen storage bottle group 1 6 and a stable and flexible gas supply pressure be provided to the medium-pressure test station 8, but the compressor 9 to be tested at the medium-pressure test station 8 can also recover the hydrogen after using it and transport it to the hydrogen storage bottle group 2 11 for storage for recycling. The solution uses the valve group 5 12 and various circulation pipelines, which can not only circulate and transport the hydrogen to the hydrogen storage bottle group 2 11 and the hydrogen storage bottle group 1 6 for storage, but also supply gas to the medium-pressure test station for recycling.

[0044] The present invention also provides a method for testing hydrogen in a medium-pressure compressor, comprising:

[0045] 1. When the gas supply pressure is close to the pressure required for the test, after the hydrogen flows out of the deflated column 2, it passes through the direct supply circuit of valve group 1 4 and valve group 2 5 in sequence through pipeline 1 13 and enters hydrogen storage bottle group 1 6, where hydrogen storage is achieved. Hydrogen storage bottle group 1 6 supplies gas stably to the outside. After passing through valve group 3 7, the hydrogen is transported to the medium-pressure test station 8 to supply gas to the 45MPa compressor for testing. The outlet of the compressor to be tested 9 then transports the tested hydrogen to hydrogen storage bottle group 2 11 through valve group 4 10, thereby achieving hydrogen recovery and storage. The hydrogen in hydrogen storage bottle group 2 11 can also be circulated and transported to hydrogen storage bottle group 2 11 through the valve group 5 12 and circulation pipeline 1 23. The cylinder circuit in hydrogen storage bottle group 2 11 that receives and stores the hydrogen after one cycle can continue to circulate and transport to hydrogen storage bottle group 1 6 and medium-pressure test station 8 through the pressure reducing branch of valve group 5 12, thereby achieving hydrogen storage and utilization.

[0046] Second, when the gas supply pressure falls below the required test pressure, hydrogen flows out of the deflated column 2, is transported through pipeline 2 14, and pressurized by the hydrogen compressor 3. It then passes through the direct supply circuit of valve group 1 4, valve group 2 5, and enters hydrogen storage group 1 6, where hydrogen is stored. Hydrogen storage group 1 6 provides a stable gas supply. After passing through valve group 3 7, the hydrogen is transported to the medium-pressure test station 8, where it is supplied to the 45MPa compressor for testing. The outlet of the compressor under test 9 then transports the tested hydrogen through valve group 4 10 to hydrogen storage group 2 11, thereby achieving hydrogen recovery and storage. The hydrogen in the hydrogen storage bottle group 2 11 can also be circulated and transported to the hydrogen storage bottle group 2 11 through the valve group 5 12 and the circulation pipeline 1 23. The cylinder circuit that receives and stores the hydrogen after one cycle in the hydrogen storage bottle group 2 11 can continue to circulate and transport it to the hydrogen storage bottle group 1 6 and the medium-pressure test station 8 through the pressure reducing branch of the valve group 5 12, thereby realizing the storage and utilization of hydrogen.

[0047] 3. When the hydrogen volume in the test system reaches the test requirement, close pipeline 1 13 and pipeline 2 14, and provide hydrogen circulation power through the compressor 9 to be tested on the medium-pressure test station 8. The hydrogen is discharged by the compressor 9 to be tested, and the outlet of the compressor 9 to be tested transports the tested hydrogen to the hydrogen storage bottle group 2 11 through valve group 4 10, thereby realizing hydrogen recovery and storage. The hydrogen in hydrogen storage bottle group 2 11 can also be circulated and transported to hydrogen storage bottle group 2 11 through the valve group 5 12 and circulation pipeline 1 23. The cylinder circuit in hydrogen storage bottle group 2 11 that receives and stores the hydrogen after one cycle can continue to circulate and transport it to hydrogen storage bottle group 1 6 and the medium-pressure test station 8 through the pressure reducing branch of valve group 5 12, thereby realizing the storage and utilization of hydrogen.

[0048] Fourth, while this solution utilizes a multi-bottle circuit to supply medium-pressure test station 8, the supply pressure can be adjusted. However, when recovering the hydrogen after testing, the pressure in some of the cylinders in the parallel hydrogen storage cylinder group 2 11 may exceed the 45 MPa compressor intake pressure requirement. If the hydrogen supply pressure is too high to meet the requirement that the intake pressure of hydrogen compressor 3 be lower than the exhaust pressure, the hydrogen will be discharged from hydrogen storage cylinder group 2 11 through a single cycle. The hydrogen will then be reduced in pressure by the pressure reducing valve in the pressure reducing branch of valve group 5 12, reducing the pressure to the required value. The hydrogen will then be circulated and delivered to hydrogen storage cylinder group 1 6 and medium-pressure test station 8, enabling the storage and utilization of the hydrogen.

[0049] 5. When the above-mentioned hydrogen supply pressure is too high, and the hydrogen pressure cannot be reduced to the required pressure value after decompression through the pressure reducing valve, a portion of the hydrogen will be discharged through the pressure reducing branch and the vent in the hydrogen storage bottle group 2 11, thereby protecting the compressor to be tested 9 in the medium-pressure compressor test station.

[0050] 6. When the medium-pressure compressor hydrogen test center is used for the first time, it is necessary to purge and replace the residual impurity gas in its internal pipeline instruments, which can be achieved through the replacement pipeline 29 in the valve group 5 12.

[0051] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the inventive concept and technical solution of the present invention, or the inventive concept and technical solution are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A medium-pressure compressor hydrogen test center, characterized by: The invention comprises a gas release column (2) connected to a test gas source, a valve group 1 (4), a valve group 2 (5), a hydrogen storage bottle group 1 (6), a hydrogen storage bottle group 2 (11), a valve group 3 (7), a valve group 4 (10), a valve group 5 (12) and a medium pressure test station (8), wherein the valve group 1 (4) comprises a direct supply circuit, the gas release column (2) is connected to the hydrogen inlet of the direct supply circuit, the hydrogen outlet of the direct supply circuit is connected to the gas inlet of the hydrogen storage bottle group 1 (6) through a pipeline and the valve group 2 (5), the hydrogen storage bottle group 1 (6) comprises a plurality of hydrogen bottles and a hydrogen storage control pipeline system, and the hydrogen storage bottle group 1 (6) is connected to the hydrogen storage control pipeline system through the hydrogen storage control pipeline system. The storage amount and gas supply pressure of the test hydrogen are changed by controlling the opening and closing of valves of different pipelines in the pipeline system. The gas outlet of the hydrogen storage bottle group 1 (6) is connected to the air inlet main pipe of the medium-pressure test station (8) through a pipeline and a valve group 3 (7). The air inlet main pipe is then connected to the air inlet of each compressor (9) to be tested in the medium-pressure test station (8) through a branch pipe. The gas outlet of each compressor (9) to be tested is connected to the gas inlet of the hydrogen storage bottle group 2 (11) through a pipeline and a valve group 4 (10). The gas outlet of the hydrogen storage bottle group 2 (11) is connected to the air inlet main pipe through a valve group 5 (12) and a pipeline. The valve group four (10) includes a recovery gas circuit and a circulation gas circuit corresponding one-to-one to the gas outlet of the compressor to be tested (9), the main gas outlet of the recovery gas circuit is connected to the gas inlet of the corresponding gas cylinder circuit in the hydrogen storage bottle group two (11), the valve group five (12) is provided with a ventilation circuit corresponding one-to-one to the gas cylinder circuit in the hydrogen storage bottle group two (11), the gas outlets of the ventilation circuits are all connected to the circulation pipeline one (23), the circulation pipeline one (23) is connected to the circulation gas circuit of the valve group four (10), and the circulation gas circuit is connected to a gas cylinder circuit in the hydrogen storage bottle group two (11) to realize the circulation transportation and storage of hydrogen; The gas cylinder loop connected to the circulating gas circuit in the hydrogen storage bottle group 2 (11) is connected to the main air inlet of the branch air circuit in the valve group 5 (12), and the branch air circuit includes two pressure reducing branches provided with pressure reducing valves, one pressure reducing branch is connected to the air inlet of the valve group 2 (5) through the circulating pipeline 2 (27), so that the hydrogen in the hydrogen storage bottle group 2 (11) can be circulated and transported to the hydrogen storage bottle group 1 (6) through the valve group 2 (5) and the pipeline 4 (16); the other pressure reducing branch is connected to the main air inlet pipe through the circulating pipeline 3 (28); The gas discharge column (2) is connected to two hydrogen supply pipelines, namely pipeline one (13) and pipeline two (14), wherein pipeline one (13) is directly connected to another hydrogen inlet of the direct supply circuit; pipeline two (14) is connected to a hydrogen inlet of the direct supply circuit via a hydrogen compressor (3); the direct supply circuit is provided with two inlet branches and one outlet branch corresponding to the hydrogen inlet.

2. A medium-pressure compressor hydrogen test center according to claim 1, characterized in that: Both hydrogen storage bottle group 1 and hydrogen storage bottle group 2 include a plurality of gas cylinder circuits arranged in parallel, wherein the gas cylinder circuits of the hydrogen storage bottle group 1 (6) are connected in parallel between the valve group 2 (5) and the valve group 3 (7), and the gas cylinder circuits of the hydrogen storage bottle group 2 (11) are connected in parallel between the valve group 4 (10) and the valve group 5 (12), and each gas cylinder circuit is provided with a corresponding hydrogen cylinder and a circuit control structure; the hydrogen storage control pipeline system includes the circuit control structure, and the circuit control structure includes a safety valve, and the safety valve is provided on the pipeline of the gas cylinder circuit.

3. A medium-pressure compressor hydrogen test center according to claim 2, characterized in that: The gas cylinder circuit includes a single-bottle circuit and a multi-bottle circuit. The single-bottle circuit has only one hydrogen cylinder, and the multi-bottle circuit includes a parallel cylinder group formed by several hydrogen cylinders connected in parallel, and the parallel cylinder group is connected to the pipeline of the gas cylinder circuit; the circuit control structure includes a first control structure and a second control structure arranged on the pipeline of the gas cylinder circuit, and a control valve arranged on the pipeline at both ends of each hydrogen cylinder; in the single-bottle circuit, the hydrogen cylinder and the control valve are both arranged between the first control structure and the second control structure; in the multi-bottle circuit, the parallel cylinder group is arranged between the first control structure and the second control structure, and the control valve is provided on the pipeline at both ends of each hydrogen cylinder in the parallel cylinder group.

4. A method for testing hydrogen in a medium-pressure compressor, characterized in that: A medium-pressure compressor hydrogen test center as described in any one of claims 1 to 3 is used, and the test method includes: after hydrogen flows out from the leak column (2), it is supplied to the hydrogen storage bottle group (6) through the direct supply circuit of the valve group (4); the hydrogen storage bottle group (6) stably supplies gas to the outside, and after passing through the valve group (7), the hydrogen is transported to the medium-pressure test station (8) to perform gas supply test on the compressor to be tested (9); the outlet of the compressor to be tested (9) passes the tested hydrogen through the valve The hydrogen in the hydrogen storage bottle group 2 (11) can be circulated and transported to the hydrogen storage bottle group 2 (11) through the valve group 5 (12) and the circulation pipeline 1 (23). The cylinder circuit that receives and stores the hydrogen after one cycle in the hydrogen storage bottle group 2 (11) can continue to circulate and transport it to the hydrogen storage bottle group 1 (6) and the medium-pressure test station (8) through the pressure reducing branch of the valve group 5 (12).

5. A method for testing hydrogen in a medium-pressure compressor according to claim 4, characterized in that: When the gas supply pressure is close to the pressure required for the test, the hydrogen flows out from the gas release column (2) and is then transported by pipeline one (13) through the direct supply circuit of valve group one (4); when the gas supply pressure is lower than the pressure required for the test, the hydrogen flows out from the gas release column (2) and is then transported by pipeline two (14) through the hydrogen compressor (3) for pressurization and then transported through the direct supply circuit of valve group one (4).

6. The method for testing hydrogen in a medium-pressure compressor according to claim 4, characterized in that: When the amount of hydrogen in the medium-pressure compressor hydrogen test center meets the test requirements, pipeline one (13) and pipeline two (14) are closed, and hydrogen circulation power is provided through the compressor to be tested (9) on the medium-pressure test station (8); the outlet of the compressor to be tested (9) transports the tested hydrogen to the hydrogen storage bottle group two (11) through the valve group four (10), thereby realizing the recovery and storage of hydrogen; and the hydrogen in the hydrogen storage bottle group two (11) can also be circulated and transported to the hydrogen storage bottle group two (11) through the valve group five (12) and the circulation pipeline one (23), and the cylinder circuit that receives and stores the hydrogen after one cycle in the hydrogen storage bottle group two (11) can continue to be circulated and transported to the hydrogen storage bottle group one (6) and the medium-pressure test station (8) through the pressure reducing branch of the valve group five (12).

7. The method for testing hydrogen in a medium-pressure compressor according to claim 4, characterized in that: When the hydrogen supply pressure in some of the gas cylinder circuits in the hydrogen storage bottle group 2 (11) is too high and cannot meet the requirement that the intake pressure of the compressor (9) to be tested is lower than the exhaust pressure, the hydrogen is output from the hydrogen storage bottle group 2 (11) after one cycle, and then the pressure is reduced by the pressure reducing valve of the pressure reducing branch of the valve group 5 (12) to reduce the pressure to the required pressure value, and then the hydrogen is circulated and transported to the hydrogen storage bottle group 1 (6) and the medium pressure test station (8); When the hydrogen supply pressure is too high, and the hydrogen pressure cannot be reduced to the required pressure value after the pressure is reduced by the pressure reducing valve, a part of the hydrogen is discharged through the pressure reducing branch and the vent in the hydrogen storage bottle group 2 (11), thereby protecting the compressor (9) to be tested in the medium-pressure compressor test station.

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