A low-pressure compressor hydrogen test center and test method

Abstract

The application discloses a kind of low-pressure compressor hydrogen test center and test method, test center includes including connecting test gas source's air release column, valve group one, valve group two, hydrogen storage bottle group, valve group three and low-pressure test station, the valve group one includes pressure reduction circuit and direct supply circuit, the air release 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 by pipeline and valve group two, the hydrogen storage bottle group includes multiple hydrogen cylinders and hydrogen storage control pipeline system, the hydrogen storage bottle group changes the storage amount of hydrogen for testing by the on-off of the valve of different pipelines in the hydrogen storage control pipeline system, the gas outlet of the hydrogen storage bottle group is connected to the hydrogen inlet of the pressure reduction circuit by pipeline and valve group three.The application can realize the integration of valve required by low-pressure compressor test process, facilitate test process automation operation, so that test hydrogen can be recycled, avoid the waste of test gas.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of compressor testing and relates to a low-pressure compressor hydrogen test center and a test method. BACKGROUND

[0002] Currently, a long tube trailer is used as an external hydrogen source in a hydrogen refueling station, and the hydrogen supply pressure of the long tube trailer is generally 20 MPa, which is lower than the filling pressure required by the hydrogen refueling station. Therefore, the hydrogen needs to be pressurized by a compressor and stored in a storage tank of the hydrogen refueling station. As one of the core devices of the hydrogen refueling station, the compressor is very important for ensuring the reliability and safety of the hydrogen refueling station.

[0003] Currently, nitrogen is used as a substitute gas for hydrogen for testing of a diaphragm compressor, and there is a certain error, which cannot effectively test the performance parameters of the diaphragm compressor.

[0004] On the other hand, bottled gas is used for gas supply during testing of the diaphragm compressor. The gas pressure of the bottled gas is customized and continuously decreases with the decrease of the gas amount, and the gas supply pressure cannot be flexibly adjusted and the stability of the pressure cannot be maintained. In addition, the gas supply mode using the bottled gas is not conducive to hydrogen recovery and further automatic testing. SUMMARY

[0005] The application aims to provide a low-pressure compressor hydrogen test center, which can effectively realize automatic testing of a compressor of a hydrogen refueling station and ensure flexible and stable gas supply pressure.

[0006] The low-pressure compressor hydrogen test center comprises a gas release column connected to a test gas source, a valve group one, a valve group two, a hydrogen storage bottle group, a valve group three and a low-pressure test station. The valve group one comprises a pressure reduction circuit and a direct supply circuit. The gas release column is connected to a hydrogen inlet of the direct supply circuit. A hydrogen outlet of the direct supply circuit is connected to an air inlet of the hydrogen storage bottle group through a pipeline and the valve group two. The hydrogen storage bottle group comprises a plurality of hydrogen cylinders and a hydrogen storage control pipeline system. The hydrogen storage amount of the test hydrogen is changed by opening and closing of valves in different pipelines of the hydrogen storage control pipeline system. An air outlet of the hydrogen storage bottle group is connected to a hydrogen inlet of the pressure reduction circuit through a pipeline and the valve group three. An outlet of the pressure reduction circuit is connected to an air inlet of a to-be-tested compressor in the low-pressure test station. An air outlet of the to-be-tested compressor is connected to the air inlet of the hydrogen storage bottle group through a pipeline and the valve group two.

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

[0008] Preferably, the gas cylinder circuit comprises a single cylinder circuit and a multiple cylinder circuit, the single cylinder circuit comprises only one hydrogen cylinder, the multiple cylinder circuit comprises 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 comprises a first control structure, a second control structure and a control valve; in the single cylinder circuit, the hydrogen cylinder and the control valve are arranged between the first control structure and the second control structure; in the multiple cylinder circuit, the parallel cylinder group is arranged between the first control structure and the second control structure, and the control valve is arranged on the pipeline at both ends of each hydrogen cylinder in the parallel cylinder group.

[0009] Preferably, the decompression circuit is provided with at least two hydrogen outlets, the low-pressure test station comprises at least two to-be-tested compressors, the hydrogen outlets are connected to the gas inlets of the to-be-tested compressors one by one, and the gas outlets of the to-be-tested compressors are connected to the corresponding gas inlets of the valve group two one by one through pipelines.

[0010] Preferably, the gas bleeding column is connected with two hydrogen supply pipelines, namely a pipeline one and a pipeline two, the pipeline one directly communicates with one hydrogen inlet of the direct supply circuit, the pipeline two communicates with the other hydrogen inlet of the direct supply circuit through a hydrogen compressor, and the direct supply circuit is provided with two gas inlet branches and one gas outlet branch corresponding to the hydrogen inlets.

[0011] Preferably, the decompression circuit is provided with a decompression valve and a venting port in sequence along the gas flow direction.

[0012] The application also provides a hydrogen test method for a low-pressure compressor, which adopts the low-pressure compressor hydrogen test center.

[0013] Preferably, the test method further comprises: when the supply gas pressure is lower than the required pressure for testing, the hydrogen gas flows out from the bleeder column, is then delivered by pipeline 2, is pressurized by the hydrogen compressor, and then sequentially passes through the direct supply circuit of valve group 1, valve group 2, and enters the hydrogen storage bottle group, where the hydrogen gas is stored, the hydrogen storage bottle group stably supplies gas to the outside, the hydrogen gas passes through valve group 3 and enters the pressure reduction circuit of valve group 1, where the hydrogen gas pressure is controlled, the pressure reduction circuit stably supplies low-pressure hydrogen gas to the tested compressor through the hydrogen gas outlet corresponding to the tested compressor, and the gas outlet of the tested compressor delivers the tested hydrogen gas to the hydrogen storage bottle group through valve group 2 for storage, and at the same time, the circulation of hydrogen gas is realized.

[0014] Preferably, the test method further comprises: when the amount of hydrogen gas in the test system meets the test requirements, pipeline 1 and pipeline 2 are closed, the hydrogen gas is provided by the tested compressor in the low-pressure test station, the hydrogen gas is discharged by the tested compressor, enters valve group 2 through pipeline 9 and pipeline 10, then enters the hydrogen storage bottle group through pipeline 4, the hydrogen storage bottle group sends the hydrogen gas into valve group 3 through pipeline 5, then enters valve group 1 through pipeline 6, and then enters the gas inlet of the tested compressor through pipeline 7 and pipeline 8, so as to realize the circulation of hydrogen gas and complete the hydrogen test of the hydrogen compressor.

[0015] Preferably, the test method further comprises: when the supply hydrogen pressure is too high and cannot meet the requirement that the hydrogen compressor inlet pressure is lower than the exhaust pressure, the hydrogen gas is output from the hydrogen storage bottle group, enters the pressure reduction circuit of valve group 1 through valve group 3 and pipeline 6, is reduced in pressure by the pressure reduction valve in the pressure reduction circuit, the pressure is reduced to the required pressure value, and then enters the gas inlet of the tested compressor through pipeline 7 and pipeline 8, so as to realize the circulation of hydrogen gas and complete the hydrogen test of the hydrogen compressor.

[0016] When the pressure is still not reduced to the required pressure value after being reduced by the pressure reduction valve, a part of the hydrogen gas is discharged through the venting port in the pressure reduction circuit, so as to protect the tested compressor in the low-pressure compressor test station.

[0017] The present application has the following advantages: the present application directly supplies gas from the long tube trailer through the bleeder column, so as to ensure the source of gas and avoid the problem of insufficient gas supply. The integration of valves required for the test process of low-pressure compressors such as 20MPa compressors is realized through the valve group, which facilitates the automatic operation of the test process. The safety and flexibility of internal circulation gas are improved through the design of the hydrogen bottle group, the circuit formed by the connection between the valve groups enables the test hydrogen to be recycled, and the waste of test gas is avoided.

[0018] In the scheme, the air inlet and outlet pressure can be adjusted by the control structure to ensure the safety of the hydrogen storage bottle group and the supply gas pressure meets the needs, ensuring the stability of the gas supply to the test station. When the hydrogen storage bottle group stores hydrogen with high pressure, the pressure can also be reduced by the pressure reducing valve and venting port in the system to ensure the safety of the test. The structure of the scheme can also meet the test needs of two or more than two compressors to be tested. The hydrogen compressor pressurization combined with the hydrogen storage bottle group can provide a variety of supply gas pressure supply, thereby widening the application range of the test process, meeting the test needs of hydrogen compressors with various inlet and outlet pressure parameters, and improving the versatility of the test process equipment. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application.

[0020] Figure 2 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application. Figure 1 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application.

[0021] Figure 3 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application. Figure 1 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application.

[0022] Figure 4 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application. Figure 1 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application.

[0023] Figure 5 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application. Figure 1 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application.

[0024] Figure 6 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application. Figure 5 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application.

[0025] Figure 7 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application. Figure 1 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application.

[0026] Figure 8 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application. Figure 1 It is a structure diagram of a low-pressure compressor hydrogen test center according to the present application.

[0027] The reference signs in the drawings include: 1, long tube trailer, 2, air release column, 3, hydrogen compressor, 4, valve group one, 5, valve group two, 6, hydrogen storage bottle group, 7, valve group three, 8, low-pressure test station, 9, compressor to be tested, 10, displacement pipeline, 11, pipeline one, 12, pipeline two, 13, pipeline three, 14, pipeline four, 15, pipeline five, 16, pipeline six, 17, pipeline seven, 18, pipeline eight, 19, pipeline nine, 20, pipeline ten. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be further described in detail below with reference to the drawings, and the description of the embodiments will help the skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the present application.

[0029] As shown in Figures 1-8 The present application discloses a low-pressure compressor hydrogen test center, which comprises a bleeder column 2 connected to a test gas source, a valve group one 4, a valve group two 5, a hydrogen storage bottle group 6, a valve group three 7 and a low-pressure test station 8. The valve group one 4 comprises a pressure reduction circuit and a direct supply circuit. The hydrogen inlet of the direct supply circuit is connected to the bleeder column 2. The hydrogen outlet of the direct supply circuit is connected to the gas inlet of the hydrogen storage bottle group 6 through a pipeline and the valve group two 5. The hydrogen storage bottle group 6 comprises a plurality of hydrogen cylinders and a hydrogen storage control pipeline system. The storage amount of test hydrogen is changed by the opening and closing of the valves in different pipelines of the hydrogen storage control pipeline system. The gas outlet of the hydrogen storage bottle group 6 is connected to the hydrogen inlet of the pressure reduction circuit through a pipeline and the valve group three 7. The outlet of the pressure reduction circuit is connected to the gas inlet of the compressor 9 to be tested in the low-pressure test station 8. The gas outlet of the compressor 9 to be tested is connected to the gas inlet of the hydrogen storage bottle group 6 through a pipeline and the valve group two 5.

[0030] The hydrogen storage bottle group 6 is provided with a plurality of valves such as safety valves and needle valves to ensure the safety of hydrogen supply. The storage amount of test hydrogen is changed by the opening and closing of the valves in different pipelines, and the hydrogen circulation rate is flexibly adjusted to meet the test requirements of hydrogen compressors 3 of different displacements. The hydrogen storage bottle group 6 is connected to the valve group three 7, which is connected back to the valve group one 4, to form a hydrogen circulation loop, thereby avoiding the loss of test hydrogen.

[0031] The hydrogen storage bottle group 6 comprises a plurality of cylinder circuits connected in parallel. Each cylinder circuit is connected in parallel between the valve group two 5 and the valve group three 7, and is provided with a corresponding hydrogen cylinder and a circuit control structure. The hydrogen storage control pipeline system comprises the circuit control structure, which comprises a plurality of safety valves such as safety valves and needle valves. The safety valves are arranged on the pipeline of the cylinder circuit.

[0032] The gas cylinder circuit includes a single cylinder circuit and a multiple cylinder circuit. The single cylinder circuit has only one hydrogen cylinder, and the multiple cylinder circuit includes a parallel cylinder group formed by parallel connection of a plurality of hydrogen cylinders, 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 cylinder circuit, the hydrogen cylinder and the control valve are arranged between the first control structure and the second control structure; in the multiple cylinder circuit, the parallel cylinder group is arranged between the first control structure and the second control structure, and the control valve is arranged on the pipeline at both ends of each hydrogen cylinder in the parallel cylinder group. The control structure can adjust the inlet and outlet pressures to ensure the safety of the hydrogen storage cylinder group 6 and the supply pressure meets the needs. For example, the compressor inlet pressure is adjusted within a certain range of the hydrogen supply pressure 20 MPa of the long tube trailer 1, so as to meet the test requirements of the corresponding 20 MPa compressor.

[0033] The decompression circuit is provided with at least two hydrogen outlets, the low-pressure test station 8 includes at least two test compressors 9, the hydrogen outlets are connected to the inlets of the test compressors 9 one by one, and the outlets of the test compressors 9 are connected to the corresponding inlets of the valve group two 5 through the pipeline one 11. This structure can simultaneously meet the test requirements of two test compressors 9 or more than two test compressors 9. In this embodiment, two test compressors 9 are arranged in the low-pressure test station 8, and the test requirements of multiple test stations can be met by increasing the outlet pipeline in the later stage.

[0034] The gas cylinder circuit is provided with at least two hydrogen outlets, the low-pressure test station 8 includes at least two test compressors 9, the hydrogen outlets are connected to the inlets of the test compressors 9 one by one, and the outlets of the test compressors 9 are connected to the corresponding inlets of the valve group two 5 through the pipeline one 11. This structure can simultaneously meet the test requirements of two test compressors 9 or more than two test compressors 9. In this embodiment, two test compressors 9 are arranged in the low-pressure test station 8, and the test requirements of multiple test stations can be met by increasing the outlet pipeline in the later stage.

[0035] The decompression circuit is provided with a decompression valve and a vent along the gas flow direction. The decompression valve can reduce the pressure of high-pressure circulating hydrogen to meet the low-pressure requirement of the test hydrogen compressor 3. When the hydrogen pressure exceeds the safety value, the vent can be used for venting. The decompression valve and the vent improve the reliability and safety of the test device.

[0036] The three gas inlets in the valve group two 5 can be connected to the same gas outlet one through a loop, and the gas outlet one is connected to a multi-bottle loop in the hydrogen storage bottle group 6. Among the three gas inlets, the gas inlet one is connected to the gas outlet one, and the gas inlet two and the gas inlet three are connected to the gas outlet two and the gas outlet three through corresponding branch gas paths, respectively, and the gas outlet two and the gas outlet three are connected to two corresponding single-bottle loops in the hydrogen storage bottle group 6. There is a multi-bottle loop and two single-bottle loops in the corresponding hydrogen storage bottle group 6.

[0037] The valve group three 7 is provided with three independent loops, and each loop is provided with a corresponding valve and other control structures. The three gas bottle loops in the hydrogen storage bottle group 6 are connected to the corresponding gas outlets through the loops in the valve group three 7, and the gas outlets in the valve group three 7 are connected to a total pipe through a branch pipe and finally connected to the pressure reducing loop of the valve group one 4. The branch pipe and the total pipe constitute a pipe six 16.

[0038] The low-pressure compressor hydrogen test center is used to test the hydrogen test center. The long pipe trailer 1 is connected to the gas column 2 to provide the test gas source. The pipe one 11 of the gas column 2 is connected to the valve group one 4, and the pipe two 12 of the gas column 2 is connected to the hydrogen compressor 3. The gas outlet of the hydrogen compressor 3 is connected to the valve group one 4, the valve group one 4 is connected to the valve group two 5 through the pipe three 13, the valve group two 5 is connected to the hydrogen storage bottle group 6 through the pipe four 14, the hydrogen storage bottle group 6 is connected to the valve group three 7 through the pipe five 15, the valve group three 7 is connected to the valve group one 4 through the pipe six 16, and the valve group one 4 is connected to the low-pressure test station 8 through the pipe seven 17 and the pipe eight 18. The low-pressure test station 8 is connected to the valve group two 5 through the pipe nine 19 and the pipe ten 20 (corresponding to the low-pressure compressor). In this way, the valve group two 5 is connected to the hydrogen storage bottle group 6 through the pipe four 14 to complete the circulation of hydrogen and complete the hydrogen test of the hydrogen compressor 3. The application also provides a low-pressure compressor hydrogen test method, which comprises:

[0039] I. When the supply pressure is close to the required pressure for testing, the hydrogen gas flows out of the bleeder column 2, then through the direct supply circuit of valve group 1 4, valve group 2 5, and into the hydrogen storage bottle group 6, where it is stored. The hydrogen storage bottle group 6 stably supplies hydrogen gas to the outside. The hydrogen gas passes through valve group 3 7 and enters the pressure reduction circuit of valve group 1 4, where it is reduced in pressure to control the hydrogen gas pressure. The pressure reduction circuit stably supplies low-pressure hydrogen gas to the test compressor 9 through the hydrogen gas outlet corresponding to the test compressor 9. The outlet of the test compressor 9 sends the tested hydrogen gas back to the hydrogen storage bottle group 6 through valve group 2 5 for storage, and also realizes the circulation of hydrogen gas. In this case, the long tube trailer 1 directly supplies hydrogen gas to the 20 MPa compressor for testing. At this time, the supply pressure of the bleeder column 2 is close to the normal working pressure of the 20 MPa compressor, so the hydrogen gas is directly supplied, and the pressure is stabilized by the hydrogen storage bottle group 6. The pressure of the gas source can meet the demand for testing gas pressure, and the pressure is relatively stable, which is suitable for testing the normal working state of the 20 MPa compressor.

[0040] II. When the supply pressure is lower than the required pressure for testing, the hydrogen gas flows out of the bleeder column 2, then through the direct supply circuit of valve group 1 4, valve group 2 5, and into the hydrogen storage bottle group 6, where it is stored. The hydrogen storage bottle group 6 stably supplies hydrogen gas to the outside. The hydrogen gas passes through valve group 3 7 and enters the pressure reduction circuit of valve group 1 4, where it is reduced in pressure to control the hydrogen gas pressure. The pressure reduction circuit stably supplies low-pressure hydrogen gas to the test compressor 9 through the hydrogen gas outlet corresponding to the test compressor 9. The outlet of the test compressor 9 sends the tested hydrogen gas back to the hydrogen storage bottle group 6 through valve group 2 5 for storage, and also realizes the circulation of hydrogen gas. In this case, the long tube trailer 1 directly supplies hydrogen gas to the 20 MPa compressor for testing. At this time, the supply pressure of the bleeder column 2 is close to the normal working pressure of the 20 MPa compressor, so the hydrogen gas is directly supplied, and the pressure is stabilized by the hydrogen storage bottle group 6. The pressure of the gas source can meet the demand for testing gas pressure, and the pressure is relatively stable, which is suitable for testing the normal working state of the 20 MPa compressor.

[0041] III. When the amount of hydrogen gas in the test system meets the testing demand, the pipe 1 1 and the pipe 2 12 are closed, and the test compressor 9 on the low-pressure test station 8 provides the hydrogen gas circulation power. The hydrogen gas is discharged from the test compressor 9, enters valve group 2 5 through pipe 9 19 and pipe 10 20, then enters the hydrogen storage bottle group 6 through pipe 4 14, and the hydrogen storage bottle group 6 sends the hydrogen gas into valve group 3 7 through pipe 5 15, then into valve group 1 4 through pipe 6, and finally into the inlet of the test compressor 9 through pipe 7 17 and pipe 8 18, realizing the circulation of hydrogen gas and completing the hydrogen gas test of the hydrogen compressor 3. At this time, the hydrogen gas stored in the hydrogen storage bottle group 6 in the system can be used for continuous testing.

[0042] Four, when the hydrogen pressure is too large, can not meet the hydrogen pressure machine 3 into the air pressure is lower than the exhaust pressure requirements, hydrogen from hydrogen bottle group 6 output, through the valve group three 7 and pipeline six into the valve group one 4 pressure reducing circuit, in the pressure reducing circuit through the pressure reducing valve on the inside, the air pressure is reduced to the required pressure value, respectively through the pipeline seven 17, pipeline eight 18 into the air inlet of the compressor 9 to be measured, realize the circulation of hydrogen, complete the hydrogen pressure machine 3 hydrogen test.

[0043] Five, when the above-mentioned hydrogen pressure is too large, when the pressure reducing valve is still unable to reduce the hydrogen pressure to the required pressure value, hydrogen is discharged through the vent in the pressure reducing circuit, to realize the protection of the compressor to be measured 9 in the low pressure compressor test station.

[0044] Six, in the initial use of the low pressure compressor hydrogen test center, the residual impurity gas in the internal pipeline instrument needs to be purged and replaced, which is realized through the replacement pipeline 10 on the air release column 2.

[0045] The application is described above in conjunction with the drawings, and it is obvious that the specific implementation of the application is not limited by the above method. Any non-essential improvement or direct application of the inventive concept and technical solution to other occasions is within the protection scope of the application.

Claims

1. A low pressure compressor hydrogen test center characterized by: The device comprises a bleeder column (2) connected to a test gas source, a valve group one (4), a valve group two (5), a hydrogen storage bottle group (6), a valve group three (7) and a low-pressure test station (8), the valve group one (4) comprises a pressure reducing circuit and a direct supply circuit, the bleeder column (2) is connected to a hydrogen inlet of the direct supply circuit, a hydrogen outlet of the direct supply circuit is connected to a gas inlet of the hydrogen storage bottle group (6) through a pipeline and the valve group two (5), the hydrogen storage bottle group (6) comprises a plurality of hydrogen cylinders and a hydrogen storage control pipeline system, the hydrogen storage bottle group (6) changes the storage amount and supply pressure of test hydrogen by opening and closing the valves of different pipelines in the hydrogen storage control pipeline system, a gas outlet of the hydrogen storage bottle group (6) is connected to a hydrogen inlet of the pressure reducing circuit through a pipeline and the valve group three (7), an outlet of the pressure reducing circuit is connected to a gas inlet of a compressor (9) to be tested in the low-pressure test station (8) in correspondence, and a gas outlet of the compressor (9) to be tested is connected to a gas inlet of the hydrogen storage bottle group (6) through a pipeline and the valve group two (5). The pressure reducing circuit is provided with at least two hydrogen outlets, the low-pressure test station (8) comprises at least two compressors (9) to be tested, the hydrogen outlets of the pressure reducing circuit are connected to the gas inlets of the compressors (9) to be tested in one-to-one correspondence, and the gas outlets of the compressors (9) to be tested are connected to corresponding gas inlets of the valve group two (5) through pipelines in one-to-one correspondence. The bleeder column (2) is connected with two hydrogen supply pipelines, namely a pipeline one (11) and a pipeline two (12), the pipeline one (11) directly communicates with one hydrogen inlet of the direct supply circuit, the pipeline two (12) communicates with another hydrogen inlet of the direct supply circuit through a hydrogen compressor (3), and the direct supply circuit is provided with two gas inlet branches and one gas outlet branch corresponding to the hydrogen inlets of the direct supply circuit. The pressure reducing circuit is provided with a pressure reducing valve and a vent in sequence along the gas flow direction.

2. A low pressure compressor hydrogen test center in accordance with claim 1 characterized by: The hydrogen storage bottle group (6) comprises a plurality of cylinder circuits arranged in parallel, each cylinder circuit is connected in parallel between the valve group two (5) and the valve group three (7), and each cylinder circuit is provided with a corresponding hydrogen cylinder and a circuit control structure; the hydrogen storage control pipeline system comprises the circuit control structure, and the circuit control structure comprises a safety valve, which is arranged on a pipeline of the cylinder circuit.

3. A low pressure compressor hydrogen test center according to claim 2, characterized in that: The cylinder circuit comprises a single cylinder circuit and a multiple cylinder circuit, the single cylinder circuit comprises only one hydrogen cylinder, the multiple cylinder circuit comprises a parallel cylinder group formed by a plurality of hydrogen cylinders connected in parallel, and the parallel cylinder group is connected to a pipeline of the cylinder circuit; the circuit control structure comprises a first control structure, a second control structure and a control valve; in the single cylinder circuit, the hydrogen cylinder and the control valve are arranged between the first control structure and the second control structure; in the multiple cylinder circuit, the parallel cylinder group is arranged between the first control structure and the second control structure, and each hydrogen cylinder in the parallel cylinder group is provided with the control valve on pipelines at both ends.

4. A method of testing hydrogen in a low-pressure compressor, characterized by: The low-pressure compressor hydrogen test center as claimed in any one of claims 1-3, the test method comprising: when the supply pressure is close to the required test pressure, hydrogen flows out of the bleeder column (2), then enters the hydrogen storage bottle group (6) through pipeline one (11) and valve group one (4) in turn, and here hydrogen storage is realized; the hydrogen storage bottle group (6) stably supplies hydrogen to the outside; hydrogen enters the pressure reduction circuit of valve group one (4) through valve group three (7), and here the hydrogen pressure is controlled by pressure reduction; the pressure reduction circuit stably supplies low-pressure hydrogen to the tested compressor (9) through the hydrogen outlet corresponding to the tested compressor (9); and the outlet of the tested compressor (9) delivers the tested hydrogen back to the hydrogen storage bottle group (6) through valve group two (5) for storage, and at the same time, the circulation of hydrogen is realized.

5. The method of claim 4, wherein: Further comprising: when the supply pressure is lower than the required test pressure, hydrogen flows out of the bleeder column (2), then enters the hydrogen storage bottle group (6) through pipeline two (12) and hydrogen compressor (3) in turn, and here hydrogen storage is realized; the hydrogen storage bottle group (6) stably supplies hydrogen to the outside; hydrogen enters the pressure reduction circuit of valve group one (4) through valve group three (7), and here the hydrogen pressure is controlled by pressure reduction; the pressure reduction circuit stably supplies low-pressure hydrogen to the tested compressor (9) through the hydrogen outlet corresponding to the tested compressor (9); and the outlet of the tested compressor (9) delivers the tested hydrogen back to the hydrogen storage bottle group (6) through valve group two (5) for storage, and at the same time, the circulation of hydrogen is realized.

6. The method of claim 5, wherein: Further comprising: when the amount of hydrogen in the test system meets the test requirement, pipeline one (11) and pipeline two (12) are closed, the hydrogen circulation power is provided by the tested compressor (9) on the low-pressure test station (8), hydrogen is discharged from the tested compressor (9), enters valve group two (5) through pipeline nine (19) and pipeline ten (20), then enters the hydrogen storage bottle group (6) through pipeline four (14), the hydrogen storage bottle group (6) sends hydrogen into valve group three (7) through pipeline five (15), then enters valve group one (4) through pipeline six (16), and finally enters the inlet of the tested compressor (9) through pipeline seven (17) and pipeline eight (18), so as to realize the circulation of hydrogen.

7. The method of claim 6, wherein: Further comprising: when the supply hydrogen pressure is too high and cannot meet the requirement that the hydrogen compressor (3) inlet pressure is lower than the outlet pressure, hydrogen is output from the hydrogen storage bottle group (6), enters the pressure reduction circuit of valve group one (4) through valve group three (7) and pipeline six (16), is reduced in pressure by the pressure reduction valve in the pressure reduction circuit, is reduced to the required pressure value, and finally enters the inlet of the tested compressor (9) through pipeline seven (17) and pipeline eight (18), so as to realize the circulation of hydrogen; when the hydrogen pressure cannot be reduced to the required pressure value after being reduced by the pressure reduction valve, a part of the hydrogen is discharged through the venting port in the pressure reduction circuit, so as to protect the tested compressor (9) in the low-pressure compressor test station.

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