A test system and test method for a high-pressure hydrogen diaphragm compressor

Abstract

The application discloses a kind of high-pressure hydrogen diaphragm compressor test system and test method, belong to the field of compressor testing.The test system includes: nitrogen supply device and hydrogen supply device, pressure reducing valve on the air inlet pipeline of the compressor to be tested;At least one first control valve, the first control valve is used to control nitrogen supply device and hydrogen supply device one of them with the compressor to be tested is connected or closed;It further includes exhaust buffer tank, the exhaust port of the compressor to be tested is also provided between the inlet of exhaust buffer tank back pressure valve;The outlet of exhaust buffer tank is connected to the pressure relief pipeline and circulation pipeline, and circulation pipeline is connected to the pipeline between pressure reducing valve and the air inlet of the compressor to be tested;At least one second control valve, the second control valve is used to control the outlet of exhaust buffer tank and the one-way communication of pressure relief pipeline and circulation pipeline;And air inlet detection device and exhaust detection device.The application is particularly suitable for the performance test of diaphragm compressor for high-pressure hydrogenation station.

Description

Technical Field

[0001] This invention relates to the field of compressor testing, and in particular to a testing system and method for a high-pressure hydrogen diaphragm compressor. Background Technology

[0002] Currently, the related technologies and engineering applications of hydrogen refueling stations have been gradually promoted in China. The processes and equipment are becoming increasingly mature, standards and specifications are becoming more comprehensive, and operation is generally safe and reliable. Among the various equipment in a hydrogen refueling station, the hydrogen compressor plays the crucial role of pressurizing low-pressure hydrogen to high-pressure hydrogen storage equipment or vehicles. It is the most important piece of equipment in a hydrogen refueling station, and there are various types, such as diaphragm compressors, piston compressors, gas-driven pumps, and liquid-driven pumps. Diaphragm compressors are the preferred choice for hydrogen refueling station construction due to their advantages such as no pollution, high pressure ratio, no leakage, and near-isothermal compression. While passenger cars abroad typically use 70MPa hydrogen storage cylinders, domestic commercial vehicles currently mainly use 35MPa cylinders. Due to limitations in driving range and hydrogen storage capacity, 70MPa hydrogen refueling stations will be the development direction for hydrogen energy refueling stations and is an inevitable trend. Therefore, performance quality assurance testing of 90MPa compressors used in 70MPa hydrogen refueling stations is essential, as their performance parameters (displacement, reliability, energy consumption, etc.) directly affect the efficient operation of the hydrogen refueling station.

[0003] JB / T6905-2019 Diaphragm Compressors provides the technical specifications for compressors, but does not provide specific test methods. Furthermore, this standard applies to diaphragm compressors with a rated discharge pressure not exceeding 25 MPa, and is unsuitable for performance testing of 90 MPa high-pressure hydrogen diaphragm compressors used in hydrogen refueling stations. GB / T 3853-2017 Acceptance Tests for Positive Displacement Compressors is a general acceptance test for positive displacement compressors. However, the 90 MPa high-pressure hydrogen diaphragm compressors used in hydrogen refueling stations have high pressure and complex structures, making this standard unsuitable for testing. For example, the standard specifies that the standard discharge location should be at the last stage discharge flange, but the discharge temperature of the 90 MPa high-pressure hydrogen diaphragm compressor used in hydrogen refueling stations is high (up to 200℃), making it difficult to measure the discharge volume, etc. The standard GB / T 15487-2015 "Method for Flow Measurement of Positive Displacement Compressors" clearly stipulates that it is not applicable to the testing of flow rates with unstable flow in pipelines. However, the inlet gas and exhaust gas of the 90MPa high-pressure hydrogen diaphragm compressor used in hydrogen refueling stations are variable, with obvious exhaust pulsation, which is a typical operating condition for moving equipment. In summary, there is currently no complete testing system and testing method in China specifically for the 90MPa high-pressure hydrogen diaphragm compressor used in hydrogen refueling stations. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the existing testing system for diaphragm compressors is not suitable for high-pressure hydrogen diaphragm compressors. Therefore, this invention proposes a performance testing system and method for high-pressure hydrogen diaphragm compressors (90MPa) used in hydrogen refueling stations to ensure the efficient and safe operation of hydrogen refueling stations.

[0005] To address the aforementioned technical problems, the present invention provides the following technical solution:

[0006] A testing system for a high-pressure hydrogen diaphragm compressor includes: a nitrogen supply device and a hydrogen supply device located on the inlet pipeline of the compressor under test; a pressure reducing valve is also installed on the pipeline between the outlet of the nitrogen supply device and the outlet of the hydrogen supply device and the inlet of the compressor under test; at least one first control valve, the first control valve being used to control one of the nitrogen supply device and the hydrogen supply device to be connected to or disconnected from the compressor under test; an exhaust buffer tank located on the exhaust pipeline of the compressor under test; a back pressure valve is also installed between the exhaust port of the compressor under test and the inlet of the exhaust buffer tank; the outlet of the exhaust buffer tank is connected to a pressure relief pipeline and a circulation pipeline; the end of the pressure relief pipeline is connected to a pressure relief port; the circulation pipeline is connected to the pipeline between the pressure reducing valve and the inlet of the compressor under test; and at least one second control valve. The second control valve is used to control the connection between the outlet of the exhaust buffer tank and one of the pressure relief pipeline and the circulation pipeline; the intake detection device is located on the intake pipeline between the pressure reducing valve and the compressor under test, and includes one or more of the intake temperature detection device, intake pressure detection device and intake flow detection device; the exhaust detection device is located on the exhaust pipeline between the compressor under test and the back pressure valve, and includes one or more of the exhaust temperature detection device, exhaust pressure detection device and exhaust flow detection device.

[0007] In some embodiments of the present invention, a control unit is also included, which is electrically connected to a first control valve, a second control valve, a pressure reducing valve, a back pressure valve, an intake detection device, and an exhaust detection device.

[0008] In some embodiments of the present invention, the intake detection device includes an intake temperature detection device, and an intake cooling device is provided on the pipeline on the input side of the intake temperature detection device.

[0009] In some embodiments of the present invention, a first check valve is provided on the circulation pipeline, and a second check valve is provided on the pressure relief pipeline.

[0010] In some embodiments of the present invention, the first control valve includes a two-position three-way valve, wherein the outlet of the nitrogen supply device and the outlet of the hydrogen supply device are respectively connected to the first inlet and the second inlet of the two-position three-way valve, and the outlet of the two-position three-way valve is connected to the inlet of the pressure reducing valve; or, the first control valve includes a first switching valve and a second switching valve, wherein the first switching valve is located on the pipeline between the outlet of the nitrogen supply device and the inlet of the pressure reducing valve, and the second switching valve is located on the pipeline between the outlet of the hydrogen supply device and the inlet of the pressure reducing valve.

[0011] In some embodiments of the present invention, the second control valve includes a two-position three-way valve, the inlet of which is connected to the outlet of the exhaust buffer tank, and the first outlet and the second outlet of which are respectively connected to the circulation pipeline and the pressure relief pipeline; or, the second control valve includes a third switch valve and a fourth switch valve, the third switch valve being located on the pressure relief pipeline and the fourth switch valve being located on the circulation pipeline.

[0012] In some embodiments of the present invention, a safety pipeline is further included between the outlet of the pressure reducing valve and the pressure relief port, and a safety valve is provided on the safety pipeline.

[0013] This invention also provides a test method for a high-pressure hydrogen diaphragm compressor, which uses the above-mentioned test system and includes the following steps:

[0014] Control the first control valve to connect the nitrogen supply device to the intake pipe of the compressor under test, and control the second control valve to connect the exhaust pipe of the compressor under test to the pressure relief pipe, and run for a first set time.

[0015] Control the first control valve to connect the hydrogen supply device to the intake pipe of the compressor under test, control the second control valve to connect the exhaust pipe of the compressor under test to the pressure relief pipe, and run for a second set time.

[0016] The back pressure value of the back pressure valve is adjusted to the first set pressure value, which is greater than or equal to the supply pressure of the hydrogen supply device; the pressure reduction value of the pressure reducing valve is adjusted to the second set pressure value, which is slightly greater than the minimum inlet pressure of the compressor under test; the second control valve is controlled to connect the exhaust pipe of the compressor under test to the circulation pipe, and the compressor under test is started.

[0017] The back pressure value of the back pressure valve is increased at a third set interval, and the pressure reduction value of the pressure reducing valve is adjusted according to the back pressure value of the back pressure valve until the back pressure value of the back pressure valve reaches the third set pressure value, and the pressure reduction value of the pressure reducing valve reaches the fourth set pressure value, and then the operation is carried out for a fourth set time.

[0018] The measurement values ​​of the intake and exhaust detection devices are recorded at the fifth set interval until the sixth set interval, so as to obtain one or more parameters of the exhaust temperature, exhaust pressure and exhaust volume of the compressor under test.

[0019] In some embodiments of the present invention, when the back pressure value of the back pressure valve reaches the third set pressure value, and the pressure reduction value of the pressure reducing valve reaches the fourth set pressure value and runs for the fourth set duration, the input current value, input voltage value, intake flow rate value, and exhaust flow rate value of the compressor under test are recorded at intervals of the fifth set duration to obtain the energy consumption value of the compressor under test.

[0020] In some embodiments of the present invention, when the back pressure value of the back pressure valve reaches the third set pressure value, the pressure reduction value of the pressure reducing valve reaches the fourth set pressure value and runs for the sixth set duration, the measured values ​​of the intake detection device and the exhaust detection device are recorded.

[0021] The technical solution of the present invention has the following technical effects compared with the prior art:

[0022] The testing system and method for a high-pressure hydrogen diaphragm compressor provided by this invention can test one or more key performance indicators of the compressor under test, such as exhaust pressure, exhaust temperature, exhaust volume, energy consumption (kWh / kgH2), and reliability (continuous operation for 500 hours), by replacing air with nitrogen and nitrogen with hydrogen. The nitrogen supply device and hydrogen supply device can be connected by controlling the first control valve, and the pressure relief and simulated normal operating conditions can be switched by controlling the second control valve. This testing system is particularly suitable for testing diaphragm compressors used in 90MPa hydrogen refueling stations.

[0023] Furthermore, the testing system of this invention uses a control unit connected to various control valves and detection devices, allowing for remote control by testing personnel. All data is automatically recorded, and the system is equipped with complete interlocking settings. In case of any abnormality, the system can automatically shut down and promptly remove high-pressure gas from the pipeline to ensure safety. It can also test other compressor design parameters such as compressor compression ratio, exhaust coefficient, indicated work, indicated efficiency, shaft power, and compressor efficiency. It can test compressor performance parameters corresponding to any inlet and outlet state, providing data and verification for improving and optimizing compressor design. This has great practical value and research significance for compressor development. Attached Figure Description

[0024] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein:

[0025] Figure 1 This is a system configuration diagram of a specific embodiment of the test system for the high-pressure hydrogen diaphragm compressor of the present invention;

[0026] Figure 2 This is a system configuration diagram of another specific embodiment of the test system for the high-pressure hydrogen diaphragm compressor of the present invention. Detailed Implementation

[0027] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] like Figure 1The diagram shows a specific embodiment of the test system for the high-pressure hydrogen diaphragm compressor of the present invention (hereinafter referred to as the test system), which includes: a nitrogen supply device 2 and a hydrogen supply device 3 located on the inlet pipe of the compressor 1 to be tested, and at least one first control valve 4. The nitrogen supply device 2 and the hydrogen supply device 3 are specifically containers or high-pressure gas tanks capable of outputting high-pressure nitrogen and hydrogen. The first control valve 4 is used to control the connection or disconnection of one of the nitrogen supply device 2 and the hydrogen supply device 3 with the compressor under test 1. A pressure reducing valve 5 is also installed on the pipeline between the outlet of the nitrogen supply device 2 and the hydrogen supply device 3 and the inlet of the compressor under test 1. An exhaust buffer tank 6 and at least one second control valve 7 are located on the exhaust pipeline of the compressor under test 1. A back pressure valve 8 is also installed on the pipeline between the exhaust port of the compressor and the inlet of the exhaust buffer tank 6. The outlet of the exhaust buffer tank 6 is connected to a pressure relief pipeline 10 and a circulation pipeline 11. The end of the pressure relief pipeline 10 is connected to a pressure relief port 12. The circulation pipeline 11 is connected to the pipeline between the pressure reducing valve 5 and the inlet of the compressor under test 1. The second control valve 7 is used to control the connection between the outlet of the exhaust buffer tank 6 and one of the pressure relief pipeline 10 and the circulation pipeline 11. The system also includes an intake detection device 13 and an exhaust detection device 14. The intake detection device 13 is located on the intake pipeline between the pressure reducing valve 5 and the compressor under test 1, and includes an intake temperature detection device. One or more of an intake pressure detection device and an intake flow detection device; the exhaust detection device 14 is located on the exhaust pipeline between the compressor 1 to be tested and the back pressure valve 8, and includes one or more of an exhaust temperature detection device, an exhaust pressure detection device, and an exhaust flow detection device.

[0032] The aforementioned high-pressure hydrogen diaphragm compressor testing system allows for the testing of one or more key performance indicators of the compressor under test, such as exhaust pressure, exhaust temperature, exhaust volume, energy consumption (kWh / kgH2), and reliability (500 hours of continuous operation), by replacing air with nitrogen and nitrogen with hydrogen. The first control valve 4 allows for the connection of the nitrogen supply device 2 and the hydrogen supply device 3, while the second control valve 7 allows for switching between pressure relief and simulated normal operating conditions. This system is particularly suitable for testing diaphragm compressors used in 90MPa hydrogen refueling stations.

[0033] Specifically, in one optional embodiment, in order to make the intake pressure and intake volume of the compressor 1 under test relatively stable, an intake buffer tank 15 is provided on the pipeline between the pressure reducing valve 5 and the intake port of the compressor 1 under test. An eighth switch valve 24 is provided on the input end pipeline of the intake buffer tank 15. By controlling the eighth switch valve 24, the intake buffer tank 15 and the intake pipeline of the compressor 1 under test can be connected or disconnected.

[0034] Specifically, in one optional embodiment, to obtain five key technical indicators of the compressor under test 1—discharge pressure, discharge temperature, discharge volume, energy consumption (kWh / kgH2), and reliability (continuous operation for 500 hours)—the intake detection device 13 includes an intake temperature detection device, an intake pressure detection device, and an intake flow detection device. The exhaust detection device 14 includes an exhaust temperature detection device, an exhaust pressure detection device, and an exhaust flow detection device. An intake cooling device is installed on the intake pipeline located in front of the intake temperature detection device. The intake cooling device includes a chiller unit 16 and a coaxial cooler 17. The gas in the intake pipeline is cooled by the coaxial cooler 17 before entering the compressor under test 1, further simulating the actual working conditions of the compressor under test 1.

[0035] Specifically, in one optional embodiment, a first check valve 18 is provided on the circulation pipeline 11. The first check valve 18 is used to deliver the gas after passing through the exhaust buffer tank 6 to the pipeline between the pressure reducing valve 5 and the compressor 1 under test. A second check valve 19 is provided on the pressure relief pipeline 10 to guide the gas in the pressure relief pipeline 10 into the pressure relief port 12 through the second check valve 19, preventing the gas in the pressure relief port 12 from flowing back into the pressure relief pipeline 10.

[0036] Specifically, in one alternative implementation, such as Figure 1 As shown, the test system includes a first control valve 4 and a second control valve 7. The first control valve 4 is a two-position three-way valve. The outlet of the nitrogen supply device 2 and the outlet of the hydrogen supply device 3 are respectively connected to the first inlet and the second inlet of the two-position three-way valve, and the outlet of the two-position three-way valve is connected to the inlet of the pressure reducing valve 5. The second control valve 7 is a two-position three-way valve. The inlet of the two-position three-way valve is connected to the outlet of the exhaust buffer tank 6, and the first outlet and the second outlet of the two-position three-way valve are respectively connected to the circulation pipeline 11 and the pressure relief pipeline 10. When nitrogen is needed to replace air, the first control valve 4 and the second control valve 7 are switched to the first working position, so that the nitrogen supply device 2 is connected to the intake pipeline of the compressor 1 under test, and the outlet of the exhaust buffer tank 6 is connected to the pressure relief pipeline 10, thereby realizing nitrogen replacement. When hydrogen is needed to replace nitrogen, the first control valve 4 is switched to the second working position, and the second control valve 7 is in the first working position, so that the hydrogen supply device 3 is connected to the intake pipeline of the compressor 1 under test. The outlet of the exhaust buffer tank 6 is connected to the pressure relief pipeline 10 to achieve hydrogen replacement.

[0037] Specifically, in one alternative implementation, such as Figure 2As shown, the test system includes multiple first control valves 4. Specifically, each first control valve 4 includes a first switching valve 4a and a second switching valve 4b. The first switching valve 4a is located on the pipeline between the outlet of the nitrogen supply device 2 and the inlet of the pressure reducing valve 5; the second switching valve 4b is located on the pipeline between the outlet of the hydrogen supply device 3 and the inlet of the pressure reducing valve 5. More specifically, the first switching valve 4a is installed at the outlet of the nitrogen supply device 2, and the second switching valve 4b is installed at the outlet of the hydrogen supply device 3. The connection to the nitrogen supply device 2 or the hydrogen supply device 3 is achieved by controlling the opening or closing of the first switching valve 4a and the second switching valve 4b. The second control valve 7 includes a third switching valve 7a and a fourth switching valve 7b. The third switching valve 7a is located on the pressure relief pipeline 10, and the fourth switching valve 7b is located on the circulation pipeline 11. Similarly, the switching between the pressure relief pipeline 10 and the circulation pipeline 11 is achieved by controlling the opening or closing of the third switching valve 7a and the fourth switching valve 7b.

[0038] Specifically, in one optional embodiment, a safety pipeline 20 is further included between the outlet of the pressure reducing valve 5 and the pressure relief port 12, and a safety valve 21 is provided on the safety pipeline 20. When the pipeline pressure after being reduced by the pressure reducing valve 5 exceeds a preset safety value, pressure relief is performed through the safety valve 21.

[0039] Specifically, in one optional embodiment, the test system further includes a control unit 25. The control unit 25 is electrically connected to the first control valve 4, the second control valve 7, the pressure reducing valve 5, the back pressure valve 8, the intake detection device 13, and the exhaust detection device 14. The control unit 25 controls the first control valve 4, the second control valve 7, the pressure reducing valve 5, and the back pressure valve 8 to switch the test system between different operating conditions (nitrogen-air replacement condition, hydrogen-nitrogen replacement condition, and simulated operating condition). At the same time, the control unit 25 calculates the exhaust pressure, exhaust temperature, exhaust volume, energy consumption (kWh / kgH2), and reliability (500h continuous operation) of the compressor 1 under test based on the detection results of the intake detection device 13 and the exhaust detection device 14.

[0040] Specifically, the control unit 25 includes one or more processors, a memory, an input device, and an output device. The processor, memory, input device, and output device can be connected via a bus or other means. The memory, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the test method of the test system in this embodiment. The processor executes various functional applications and data processing of the server by running the non-volatile software programs, instructions, and modules stored in the memory, thus achieving the above. The input device can receive input digital or character information and generate key signal inputs related to user settings and function control of the test system. The output device may include a display screen or other display device.

[0041] Specifically, in one alternative implementation, such as Figure 2 As shown, a fifth switching valve 22 and a sixth switching valve 23 are also installed on the pipeline on the input side of the pressure reducing valve 5. The fifth switching valve 22 is a manual valve, and the sixth switching valve 23 is a solenoid valve electrically connected to the control unit 25. The fifth switching valve 22 and the sixth switching valve 23 are used to cut off the entire system in the event of a sudden malfunction of the test system, so as to minimize damage to the compressor 1 under test. A seventh switching valve 9 is also installed on the pipeline on the output side of the pressure reducing valve 5. In the event of a sudden malfunction of the test system, controlling the seventh switching valve 9 can protect the compressor 1 under test and prevent the intake pressure of the compressor 1 under test from becoming too high.

[0042] This invention also provides a test method for testing a compressor using a test system for a high-pressure hydrogen diaphragm compressor according to one of the above embodiments. The test system includes a first control valve 4 and a second control valve 7. The test method includes the following steps:

[0043] S1. Nitrogen replacement of air: Control the first control valve 4 to switch to the first working position so that the nitrogen supply device 2 is connected to the air intake pipe of the compressor under test 1, control the second control valve 7 to switch to the first working position so that the exhaust pipe of the compressor under test 1 is connected to the pressure relief pipe 10, run for a first set time, so that the air in the compressor under test 1 is discharged to the pressure relief port 12, and the compressor under test 1 is filled with nitrogen.

[0044] S2. Hydrogen replacing nitrogen: Control the first control valve 4 to switch to the second working position so that the hydrogen supply device 3 is connected to the intake pipe of the compressor under test 1, control the second control valve 7 to keep the first working position so that the exhaust pipe of the compressor under test 1 is connected to the pressure relief pipe 10, run for the second set time, so that the nitrogen in the compressor under test 1 is discharged to the pressure relief port 12, and the compressor under test 1 is filled with nitrogen, simulating the compressed gas under the actual working conditions of the compressor under test 1;

[0045] S3. Simulate compressor start-up operation: Adjust the back pressure value of the back pressure valve 8 to the first set pressure value, where the first set pressure value is greater than or equal to the supply pressure of the hydrogen supply device 3. For example, adjust the back pressure value of the back pressure valve 8 to 20 MPa; adjust the pressure reduction value of the pressure reducing valve 5 to the second set pressure value, where the second set pressure value is slightly greater than the minimum inlet pressure of the compressor under test 1. For example, adjust the pressure reduction value of the pressure reducing valve 5 to 5 MPa; control the second control valve 7 to switch to the second working position to connect the exhaust pipe of the compressor under test 1 to the circulation pipe 11, and start the compressor under test 1; thus achieving low-pressure start-up of the compressor under test 1.

[0046] S4. Simulate normal compressor operation: Increase the back pressure value of the back pressure valve 8 at intervals of the third set pressure value, for example, at intervals of 5 MPa. Adjust the pressure reduction value of the pressure reducing valve 5 according to the back pressure value of the back pressure valve 8. When the back pressure value of the back pressure valve 8 fails to reach the set back pressure value, it indicates that the gas supply pressure is insufficient. At this time, slowly adjust and increase the value of the pressure reducing valve 5 (for example, at intervals of 2 MPa) until the compressor runs smoothly. Continue to increase the back pressure value and the pressure reduction value until the back pressure value of the back pressure valve 8 reaches the third set pressure value and the pressure reduction value of the pressure reducing valve 5 reaches the fourth set pressure value, for example, the back pressure value reaches 87.5 MPa or 90 MPa and the pressure reduction value reaches 12.5 MPa. Run for the fourth set time, for example, 5-10 minutes, until the compressor runs stably. At this time, the operating state of the compressor 1 under test in this test system is consistent with its actual operating state.

[0047] S5. Performance index detection: Record the measured values ​​of the intake detection device 13 and the exhaust detection device 14 at fifth set intervals until the sixth set interval. For example, the control unit 25 collects the intake temperature value of the intake temperature detection device, the intake pressure value of the intake pressure detection device, the intake mass flow rate of the intake flow detection device, the exhaust temperature value of the exhaust temperature detection device, the exhaust pressure value of the exhaust pressure detection device, and the exhaust mass flow rate of the exhaust flow detection device at 1-second intervals. Record continuously for 60 minutes, and obtain one or more parameters of the exhaust temperature, exhaust pressure, and exhaust volume of the compressor 1 under test by averaging the various parameters.

[0048] To obtain the energy consumption per unit mass of hydrogen for the compressor 1 under test, the above test method also includes the following steps:

[0049] S6. After step S4 is completed and the compressor is running under normal operating conditions, the input current value, input voltage value, and intake and exhaust flow rates of the compressor under test 1 are recorded at fifth set intervals to obtain the energy consumption value of the compressor under test 1. For example, the input current value, input voltage value, intake and exhaust flow rates of the compressor are automatically collected every 1 second, and the energy consumption E per unit mass of hydrogen gas of the compressor is obtained using the following formula:

[0050] E = P / (60 * q) m )

[0051] In the formula; E is the energy consumption per unit mass, (KW*h) / kg; P is the input power of the compressor system, P=U*I, KW; U is the input voltage value of the compressor under test, and I is the input current value of the compressor under test; q m The value is the mass flow rate, expressed in kg / min.

[0052] To further obtain the total energy consumption of the compressor 1 under test during operation, the voltage and current values ​​of the chiller can also be obtained to obtain the total input power P. 总 Then, calculate the total energy consumption value by referring to the energy consumption formula above.

[0053] To obtain the reliability of the compressor 1 under test, the above test method also includes the following steps:

[0054] S7. When the back pressure value of the back pressure valve 8 reaches the third set pressure value, and the pressure reduction value of the pressure reducing valve 5 reaches the fourth set pressure value and runs for the sixth set duration, the measured values ​​of the intake detection device 13 and the exhaust detection device 14 are recorded. For example, the back pressure value of the back pressure valve 8 is adjusted to 87.5MPa or 90MPa, the pressure reduction value of the pressure reducing valve 5 is adjusted to 12.5MPa, and the system runs continuously for 500 hours. Various indicators of the compressor 1 under test are recorded, such as the exhaust temperature, exhaust pressure, and exhaust volume of the compressor 1 under test.

[0055] In other alternative implementations, when the test system employs, for example... Figure 2 When the test system with multiple first control valves 4 and multiple second control valves 7 is shown, during the test, in steps S1, S2 and S3, the first switching valve 4a, the second switching valve 4b, the third switching valve 7a and the fourth switching valve 7b are controlled to realize nitrogen replacement of air, hydrogen replacement of nitrogen and simulate the starting operation of the compressor, which will not be described in detail here.

[0056] During testing, the system utilizes a control unit 25 connected to all control valves and detection devices, allowing for remote control by personnel. All data is automatically recorded, and the system features comprehensive interlocking mechanisms. In case of any abnormality, the system automatically shuts down and promptly removes high-pressure gas from the pipeline, ensuring safety. Furthermore, in addition to meeting the testing and evaluation requirements of the five key parameters mentioned in the text, the system can also test other compressor design parameters such as compression ratio, exhaust coefficient, indicated work, indicated efficiency, shaft power, and compressor efficiency. It can test compressor performance parameters under arbitrary inlet and outlet conditions (outlet pressure should be greater than inlet pressure), providing data and verification for improving and optimizing compressor design. This has significant practical value and research significance for compressor development, filling a gap in the industry's compressor testing systems.

[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A testing system for a high-pressure hydrogen diaphragm compressor, characterized in that, include: A nitrogen supply device and a hydrogen supply device are located on the intake pipe of the compressor under test. A pressure reducing valve is also installed on the pipe between the outlet of the nitrogen supply device and the hydrogen supply device and the intake port of the compressor under test. At least one first control valve is provided, which controls the connection or disconnection of one of the nitrogen supply device and the hydrogen supply device with the compressor under test; the first control valve includes a two-position three-way valve, wherein the outlet of the nitrogen supply device and the outlet of the hydrogen supply device are respectively connected to the first inlet and the second inlet of the two-position three-way valve, and the outlet of the two-position three-way valve is connected to the inlet of the pressure reducing valve; or, the first control valve includes a first switching valve and a second switching valve, wherein the first switching valve is located on the pipeline between the outlet of the nitrogen supply device and the inlet of the pressure reducing valve, and the second switching valve is located on the pipeline between the outlet of the hydrogen supply device and the inlet of the pressure reducing valve; An exhaust buffer tank is located on the exhaust pipe of the compressor under test. A back pressure valve is also provided between the exhaust port of the compressor under test and the inlet of the exhaust buffer tank. The outlet of the exhaust buffer tank is connected to a pressure relief pipe and a circulation pipe. The end of the pressure relief pipe is connected to a pressure relief port. The circulation pipe is connected to the pipe between the pressure reducing valve and the air inlet of the compressor under test. At least one second control valve is provided, which controls the connection between the outlet of the exhaust buffer tank and one of the pressure relief pipeline and the circulation pipeline; the second control valve includes a two-position three-way valve, the inlet of which is connected to the outlet of the exhaust buffer tank, and the first outlet and the second outlet of which are respectively connected to the circulation pipeline and the pressure relief pipeline; or, the second control valve includes a third switch valve and a fourth switch valve, the third switch valve being located on the pressure relief pipeline and the fourth switch valve being located on the circulation pipeline; An intake detection device is located on the intake pipeline between the pressure reducing valve and the compressor under test, and includes one or more of an intake temperature detection device, an intake pressure detection device, and an intake flow detection device. An exhaust gas detection device is located on the exhaust pipeline between the compressor under test and the back pressure valve, and includes one or more of an exhaust gas temperature detection device, an exhaust gas pressure detection device, and an exhaust gas flow detection device.

2. The testing system for a high-pressure hydrogen diaphragm compressor according to claim 1, characterized in that, It also includes a control unit, which is electrically connected to the first control valve, the second control valve, the pressure reducing valve, the back pressure valve, the intake detection device, and the exhaust detection device.

3. The testing system for a high-pressure hydrogen diaphragm compressor according to claim 1, characterized in that, The intake detection device includes an intake temperature detection device, and an intake cooling device is installed on the pipeline on the input side of the intake temperature detection device.

4. The testing system for a high-pressure hydrogen diaphragm compressor according to claim 1, characterized in that, A first check valve is installed on the circulation pipeline, and a second check valve is installed on the pressure relief pipeline.

5. The testing system for a high-pressure hydrogen diaphragm compressor according to claim 1, characterized in that, The pressure reducing valve also includes a safety pipeline between its outlet and the pressure relief port, and a safety valve is installed on the safety pipeline.

6. A test method for a high-pressure hydrogen diaphragm compressor, characterized in that, The testing system described in any one of claims 1-5 comprises the following steps: Control the first control valve to connect the nitrogen supply device to the intake pipe of the compressor under test, and control the second control valve to connect the exhaust pipe of the compressor under test to the pressure relief pipe, and run for a first set time. Control the first control valve to connect the hydrogen supply device to the intake pipe of the compressor under test, control the second control valve to connect the exhaust pipe of the compressor under test to the pressure relief pipe, and run for a second set time. The back pressure value of the back pressure valve is adjusted to the first set pressure value, which is greater than or equal to the supply pressure of the hydrogen supply device; the pressure reduction value of the pressure reducing valve is adjusted to the second set pressure value, which is slightly greater than the minimum inlet pressure of the compressor under test; the second control valve is controlled to connect the exhaust pipe of the compressor under test to the circulation pipe, and the compressor under test is started. The back pressure value of the back pressure valve is increased at a third set interval, and the pressure reduction value of the pressure reducing valve is adjusted according to the back pressure value of the back pressure valve until the back pressure value of the back pressure valve reaches the third set pressure value, and the pressure reduction value of the pressure reducing valve reaches the fourth set pressure value, and then the operation is carried out for a fourth set time. The measurement values ​​of the intake and exhaust detection devices are recorded at the fifth set interval until the sixth set interval, so as to obtain one or more parameters of the exhaust temperature, exhaust pressure and exhaust volume of the compressor under test.

7. The test method for a high-pressure hydrogen diaphragm compressor according to claim 6, characterized in that, When the back pressure value of the back pressure valve reaches the third set pressure value, and the pressure reduction value of the pressure reducing valve reaches the fourth set pressure value and runs for the fourth set duration, the input current value, input voltage value, intake flow rate value and exhaust flow rate value of the compressor under test are recorded at intervals of the fifth set duration to obtain the energy consumption value of the compressor under test.

8. The test method for a high-pressure hydrogen diaphragm compressor according to claim 7, characterized in that, When the back pressure value of the back pressure valve reaches the third set pressure value, the pressure reduction value of the pressure reducing valve reaches the fourth set pressure value and runs for the sixth set duration, the measured values ​​of the intake detection device and the exhaust detection device are recorded.

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