Test device and test method for hydrogen compressor test

Abstract

The invention discloses a hydrogen compressor test device and a test method.The test device comprises a gas storage bottle set, two inlet buffer tanks, two testers, two outlet buffer tanks and a back pressure valve which are sequentially communicated through pipelines, and the inlet buffer tanks and the testers are connected in parallel; outlets of the back pressure valves are communicated to the two groups of inlet buffer tanks, and the two groups of back pressure valves are arranged in parallel; the pipe diameters of the inlet pipelines and the outlet pipelines corresponding to the inlets and the outlets of the two groups of testing machines are different, so that the displacement is controlled according to the pressure. The system has the characteristics of wide working condition, high pressure, large discharge capacity, automatic control and gas recovery, can monitor performance parameters such as temperature, pressure, discharge capacity and the like in a platform operation process in real time, meets the requirements of various hydrogen energy compressor type tests, predelivery tests and scientific research tests, and provides support for design, simulation and performance evaluation of a unit.

Description

Technical Field

[0001] This invention relates to the field of hydrogen compressor testing technology. More specifically, this invention relates to a hydrogen compressor testing apparatus and testing method. Background Technology

[0002] With the advancement of global "dual carbon" goals, the importance of hydrogen energy as a clean energy source is becoming increasingly prominent, especially in the fields of transportation, energy storage, and industry. However, the storage and transportation of hydrogen relies on efficient and safe compression technology, and the performance of hydrogen compressors, as core equipment in hydrogen refueling stations and hydrogen production devices, directly affects the stability and economics of the hydrogen energy industry chain.

[0003] Currently, the mainstream pressure at hydrogen refueling stations is 35-70 MPa, but the technological maturity of domestic high-pressure (e.g., 90 MPa) compressors is insufficient, leading to high costs due to reliance on imported equipment. Domestically produced compressors are often launched directly to the market without sufficient testing and verification, impacting their application. Furthermore, hydrogen compressors lack third-party testing and certification.

[0004] The significance of constructing a hydrogen compressor testing facility and conducting compressor tests includes: 1. Optimizing design parameters: By simulating different operating conditions (such as pressure, temperature, and flow rate), key indicators such as compressor sealing ring materials, lubrication, and compression performance are verified, guiding structural improvements. 2. Accelerating the localization process: The compressor passed 500 hours of rigorous testing, verifying its reliability and laying the foundation for commercialization. 3. Providing data support: The testing platform provides data support for hydrogen compressor testing standards.

[0005] Relevant existing technologies: 1. Different application fields. Existing technologies mainly apply to air conditioning and refrigeration, sealing testing, carbon dioxide refrigeration, and automotive air compressors. 2. Smaller operating range and lower pressure levels. For example, the test exhaust pressure for a carbon dioxide refrigeration compressor is 15 MPa. 3. Simulates partial functional tests. For example, the ionic liquid compressor test simulation device is a single-cylinder simulation test to observe the state of the ionic liquid.

[0006] The main problems are: there are many types of hydrogen compressors, the existing whole machine test equipment is not perfect, the test equipment has a small operating range, low applicability, and low level of automation control. Summary of the Invention

[0007] One objective of this invention is to provide a hydrogen compressor testing device and method, which features wide operating conditions, high pressure, large displacement, automated control, and gas recovery. It can monitor performance parameters such as temperature, pressure, and displacement in real time during platform operation, meeting the needs of various hydrogen compressor type tests, factory tests, and scientific research tests, and providing support for unit design, simulation, and performance evaluation.

[0008] To address the aforementioned technical problems, this invention provides a hydrogen compressor testing device, comprising a gas storage cylinder group, an inlet buffer tank, a testing machine, an outlet buffer tank, and a back pressure valve connected sequentially via pipelines. Two sets of inlet buffer tanks and two sets of testing machines are provided and connected in parallel. The outlets of the back pressure valves are connected to both sets of inlet buffer tanks, and two sets of back pressure valves are also provided in parallel. The inlet and outlet pipelines of the two sets of testing machines have different diameters, allowing for control of the discharge rate based on pressure.

[0009] Preferably, the gas storage cylinder group is also connected to the inlet of the booster, and the outlet of the booster returns to the gas storage cylinder group, while also being connected to the inlets of two sets of inlet buffer tanks.

[0010] Preferably, heat exchangers are installed on both the inlet and outlet pipelines of the back pressure valve.

[0011] Preferably, an interstage buffer tank is also connected to the outside of the testing machine.

[0012] Preferably, the outlets of both sets of inlet buffer tanks are also connected to the gas storage cylinder group via pipelines to achieve gas recovery.

[0013] Preferably, the gas storage cylinder group is also connected to the gas collection compartment.

[0014] Preferably, it also includes a monitoring and control system, which includes a monitoring system for the testing machine and a monitoring system for the platform. The monitoring system for the testing machine is used to monitor the parameters of the compressor, including inlet pressure and temperature, interstage pressure and temperature, exhaust pressure and temperature before and after exhaust cooling, motor speed, hydraulic system parameters, and energy consumption. The monitoring system for the platform includes monitoring parameters such as pressure before and after the back pressure valve, pressure and temperature of the inlet buffer tank, pressure and temperature of the outlet buffer tank, pressure and temperature of the gas storage cylinder group, booster parameters, and temperature before and after the chiller.

[0015] The present invention also provides a method for conducting hydrogen compressor tests using a hydrogen compressor test apparatus, comprising the following steps: Step 1: After confirming that the start-up conditions meet the requirements, pre-charge the buffer tank; Step 2: Start the compressor and conduct a low-load test first. After the compressor is found to be running normally, conduct a compressor load test. Adjust the test conditions according to the compressor's test conditions to make the compressor run under the set rated conditions for the set time. Step 3: After the compressor is running stably, adjust it to the remaining test conditions of the testing machine according to the test requirements, and conduct the test until all the specified test conditions are completed. Then, shut down the compressor. The adjustment of the testing machine includes: when the intake pressure needs to be increased, adjust the back pressure valve pressure to the exhaust pressure, and adjust the pressure to the test condition through staged direct charging and booster compressor gas replenishment; when the intake pressure needs to be decreased, adjust the back pressure valve pressure to the exhaust pressure, and adjust the pressure to the test condition through the recovery pipeline. Step 4: Recover the gas in the test device and vent the gas in the pipeline.

[0016] Preferably, the pre-filling of the buffer tank in step one specifically involves: first, directly filling with the low-pressure cylinder group; when the pressure of the buffer tank and the low-pressure cylinder group is balanced, directly filling with the medium-pressure cylinder group; when the pressure of the buffer tank and the medium-pressure cylinder group is balanced, directly filling with the high-pressure cylinder group; and when the pressure of the buffer tank and the high-pressure cylinder group is balanced, using a booster to pressurize and replenish the gas.

[0017] Preferably, in step four, the gas recovery adopts a multi-stage recovery method, specifically as follows: After the test, when the pressure is high, the gas in the pipeline and buffer tank is first directly charged back to the high-pressure tank in the gas storage cylinder group; after the gas pressure reaches equilibrium, the high-pressure tank is switched to the medium-pressure tank, and the gas is directly charged back to the medium-pressure tank in the gas storage cylinder group; after the gas pressure reaches equilibrium, the medium-pressure tank is switched to the low-pressure tank, and the gas is directly charged back to the low-pressure tank in the gas storage cylinder group; after the gas pressure reaches equilibrium, the booster is started, and the booster is used to recover the gas to the medium-pressure tank or low-pressure tank in the gas storage cylinder group so that the gas pressure in the pipeline reaches below 1.0 MPa, thus completing the gas recovery.

[0018] The present invention has at least the following beneficial effects: 1. The device of the present invention adopts two sets of closed-loop pressure regulating systems, which are suitable for a wide range of operating conditions and various types of compressors, including liquid-driven, diaphragm, compound, and ion-liquid compressors.

[0019] 2. The device of the present invention can perform compressor tests for a long time, and carry out various tests such as factory tests and 500-hour type tests.

[0020] 3. The testing process of the device of the present invention can be remotely operated and controlled, and data recording is completed automatically, ensuring safety.

[0021] 4. The pressure-stage gas recovery method of the device of the present invention, which uses "direct charging + pressurization", can recover most of the gas and reduce costs.

[0022] 5. The device of the present invention can be applied in the research and development, type testing, and factory testing of compressors, providing third-party testing services for compressor testing and providing data support for compressor testing standards.

[0023] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0024] Figure 1 This is a process flow diagram of the experimental apparatus of the present invention; Figure 2 This is a schematic diagram illustrating the interstage buffer tank setup of the present invention. Detailed Implementation

[0025] To better understand the purpose, structure, and function of this invention, the invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0026] It should be noted that, unless otherwise specified, the test methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 this invention.

[0027] This invention provides a hydrogen compressor testing device and method. The principle is as follows: the test platform consists of two closed-loop pressure regulating systems; one system can be used for testing high-pressure, small-displacement hydrogen compressors, and the other can be used for testing low-pressure, large-displacement compressors. The test medium is helium or nitrogen. The main piping section consists of a compressor inlet piping module and a compressor outlet piping module. The inlet piping module provides the compressor with the intake gas source; the outlet piping module provides back pressure to the compressor and reduces the gas pressure to the compressor inlet pressure.

[0028] like Figure 1As shown, this invention provides a hydrogen compressor testing device, comprising a gas storage cylinder group, an inlet buffer tank, a testing machine, an outlet buffer tank, and a back pressure valve, all connected sequentially by pipelines. Two sets of inlet buffer tanks and two sets of testing machines are provided and connected in parallel. The outlets of the back pressure valves are connected to both sets of inlet buffer tanks. The inlet and outlet pipelines of the two sets of testing machines have different diameters, allowing for control of the discharge rate based on pressure. The gas storage cylinder group is also connected to the inlet of a booster compressor, and the booster compressor outlet returns to the gas storage cylinder group and is also connected to the inlets of the two sets of inlet buffer tanks. Heat exchangers are installed on both the inlet and outlet pipelines of the back pressure valves. An interstage buffer tank is also connected to the outside of the testing machine. The outlets of both sets of inlet buffer tanks are also connected to the gas storage cylinder group via pipelines for gas recovery. The gas storage cylinder group is also connected to a gas collection grid.

[0029] The test platform of this application consists of a gas supply and replenishment system, a process gas system, a cooling water system, an instrument ventilation system, a safety venting system, and a monitoring and control system. Among them: The gas supply and replenishment system consists of three 1 cubic meter 20MPa pressure-rated gas cylinder groups, a gas collection grid, a booster compressor, and a piping system. The gas cylinder groups store gases at different pressures to provide different pressure levels of gas to the test compressor. After the test, the recovered gas is stored. The booster compressor increases the pressure of the gas source to the compressor inlet pressure when the gas cylinder groups cannot provide the required pressure. Simultaneously, after the test, the booster compressor can recover the gas in the pipeline. During gas recovery, the gas is first directly returned to the gas cylinder groups for energy saving. Then, lower-pressure gases can be further pressurized by the booster compressor before being returned to the gas cylinder groups, resulting in cleaner and more thorough gas recovery, reaching up to 0.8MPa. The gas collection grid provides gas to the gas cylinder groups when they are insufficient, and can also directly supply gas to the test compressor (i.e., the testing machine) when necessary.

[0030] The process gas system consists of inlet buffer tank 01 ( Figure 1 (Set in the middle at the top), Inlet buffer tank 02 ( Figure 1The system consists of an inlet buffer tank (located at the bottom), an interstage buffer tank, an outlet buffer tank, back pressure valve 01, back pressure valve 02, heat exchanger 01, heat exchanger 02, and piping system. The inlet buffer tank 01 buffers the inlet gas of the high-pressure, low-displacement hydrogen compressor; the inlet buffer tank 02 buffers the inlet gas of the low-pressure, high-displacement compressor. Different pipe diameters are used for the inlet and outlet pipelines to accommodate different conditions. The inlet pipeline runs from the back pressure valve to the inlet buffer tank and then to the inlet of the testing machine; the outlet pipeline runs from the outlet of the testing machine to the back pressure valve. The interstage buffer tank provides interstage buffering for the dual-pressure compressor, enabling the device to simulate not only the compressor's inlet and outlet operation but also the compressor's interstage output test operation. The outlet buffer tank buffers the outlet gas from the test compressor. Back pressure valves 01 and 02 control the compressor's discharge pressure; the parallel connection of two back pressure valves provides a wide range and high precision for the compressor's discharge pressure. Heat exchangers 01 and 02 cool the helium depressurization process (when using helium in the test, the depressurization process will cause a temperature rise due to the anti-coke effect). The above equipment forms two compressor circulation pipeline systems and provides separate recovery gas pipelines.

[0031] Due to the different applications of hydrogen compressors, such as compressors used for tanker filling at mother stations, the inlet pressure is 1.7-2.8 MPa and the outlet pressure is 1800 Nm. 3 This type of compressor operates at low pressure and high displacement, with an intake pressure of 5-20 MPa and an exhaust pressure of 500 Nm³ / h. In contrast, the compressors used at hydrogen refueling stations for hydrogen-powered vehicles have an intake pressure of 5-20 MPa and an exhaust pressure of 500 Nm³ / h. 3 / h or 1000Nm 3 / h, these compressors are high-pressure, low-displacement compressors. The test conditions for these two types of compressors differ significantly, making a single test system unsuitable. Therefore, to meet the testing requirements of various compressors, this test platform is designed with two test cycle systems: one with a DN40 compressor inlet pipe, whose valve and instrumentation are selected based on this pipe diameter to meet the low-pressure, high-displacement requirement; and another using a 1-inch compression fitting pipe, whose valve and instrumentation are selected based on this pipe diameter to meet the high-pressure, low-displacement requirement.

[0032] For the interstage buffer tank setup, compressor test platforms typically provide two gas line interfaces, one inlet and one outlet. However, for dual-pressure compressors used in hydrogen refueling stations with special requirements, capable of providing both 45MPa and 90MPa hydrogen pressures, a single inlet / outlet interface would prevent simultaneous testing of the compressor's dual-outlet performance. Therefore, this test platform incorporates an interstage buffer tank, enabling simultaneous testing of both 45MPa and 90MPa dual-exhaust functions during dual-pressure compressor testing, more realistically simulating the operating conditions of a hydrogen refueling station. Figure 2 As shown.

[0033] The cooling water system consists of a chiller, flow meters, and piping. The chiller provides circulating cooling water, while the flow meters measure the water flow in each branch. The chiller is used to circulate and cool two sets of testing machines, a booster compressor, and two sets of heat exchangers.

[0034] The instrument air system consists of a gas collector, a pressure reducing valve, and a piping system. The gas collector provides the instrument air supply; the pressure reducing valve stabilizes the gas pressure at 0.8 MPa. The gas collector supplies air to both sets of testing machines and the booster compressor.

[0035] The safety venting system consists of a venting column, a silencer, a safety valve, an active venting valve, and a piping system. The safety valve prevents system overpressure; the active venting valve allows for manual pressure relief; the silencer reduces noise during the pressure relief process; and the venting column discharges the depressurized gas. The safety venting system connects and controls two sets of testing machines, a booster compressor, two sets of inlet buffer tanks, an outlet buffer tank, an interstage buffer tank, and a gas storage cylinder group.

[0036] The monitoring and control system is responsible for monitoring data from the test system, providing interlock protection, and recording data. The test platform's monitoring system consists of two parts: one part monitors the compressor system (the monitoring system for the test machine), and the monitoring content varies depending on each compressor; the other part monitors the platform system, and the monitoring content remains constant.

[0037] To improve the applicability of the monitoring system software to different compressors, this experimental platform monitoring system fully considers the differences in compressor structure, application, and communication interface, and is designed with a modular and parameterized interface to make it compatible with various types of compressors. The main design is as follows: (1) Communication protocols: It is configured with a variety of mainstream communication protocols, including 485, TCP / IP, etc., which expands the applicability of signal transmission.

[0038] (2) A four-stage compression design was implemented. Based on the characteristics of the compressor, the compression display structure can be configured for one, two, three, and four stages respectively. For a hydrogen compressor, four-stage compression is sufficient.

[0039] (3) Each compression stage can be selected as either a 1-cylinder mode or a 2-cylinder mode. For a single-stage compression with one cylinder, select the 1-cylinder mode; for a single-stage compression with two cylinders connected in parallel, select the 2-cylinder mode. For hydrogen compressors, the 2-cylinder mode is sufficient.

[0040] (4) Based on the cylinder, each cylinder is equipped with monitoring parameters such as intake pressure, intake temperature, exhaust pressure, exhaust temperature before cooling, exhaust temperature after cooling, and cylinder vibration.

[0041] (5) By configuring the number of compression stages and the cylinder mode for each stage, the monitoring parameters of the test compressor can be determined.

[0042] The monitoring system of the testing machine is used to monitor compressor parameters, including inlet pressure and temperature, interstage pressure and temperature, exhaust pressure and temperature before and after exhaust cooling, motor speed, hydraulic system parameters, energy consumption, etc. The platform's monitoring system mainly monitors the pressure and temperature of the gas storage cylinder group, the pressure and temperature of the buffer tanks (including the inlet buffer tank, outlet buffer tank, and interstage buffer tank), the pressure before and after the back pressure valve, the temperature before and after the chiller, and the parameters of the booster compressor. The monitored parameters are used to determine whether the test is proceeding normally, and simultaneously monitor the test results.

[0043] In addition, the monitoring platform is equipped with a fault diagnosis function based on process analysis. By using a combination of FMEA and Hazop, it analyzed the impact of deviations at process nodes in the compressor main pipeline, hydraulic system, and electrical control system on the upstream and downstream nodes of those nodes, establishing a process fault diagnosis knowledge base. Artificial intelligence algorithms are used for state matching to determine whether equipment malfunctions.

[0044] In summary, the complete machine testing platform of this application is a large-scale closed-loop testing platform for hydrogen compressors, featuring wide operating conditions, high pressure, large displacement, automated control, and gas recovery. The test medium is helium or nitrogen, with a supply pressure of 1-50 MPa, a maximum platform operating pressure of 105 MPa, and a displacement of 200-2000 Nm³. 3 The system can monitor performance parameters such as temperature, pressure, and displacement in real time during platform operation. It meets the needs of various hydrogen compressor type tests, factory tests, and scientific research tests, providing support for unit design, simulation, and performance evaluation.

[0045] This invention also provides a method for testing a hydrogen compressor using a hydrogen compressor testing device, and the test steps of the whole machine testing platform are as follows: (1) Confirm startup conditions The conditions of the test platform, including cooling water, instrument ventilation, power supply, and electrical control, were checked to confirm that the external input conditions met the start-up requirements. Simultaneously, the status of the compressor body valves and the fixing status of the compressor foundation were checked to confirm that they met the start-up requirements.

[0046] (2) Pre-filling of the buffer tank The inlet buffer tank is directly charged using a gas storage cylinder group. First, use the low-pressure cylinder group for direct charging; when the pressure of the buffer tank and the low-pressure cylinder group is balanced, switch to the medium-pressure cylinder group for direct charging; when the pressure of the buffer tank and the medium-pressure cylinder group is balanced, switch to the high-pressure cylinder group for direct charging; when the pressure of the buffer tank and the high-pressure cylinder group is balanced, use a booster compressor for pressurization and replenishment. Using the above method, the buffer tank can be pressurized to 50MPa (this pressure is determined by the booster compressor's pressurization capacity, as well as the pressure-bearing capacity and monitoring capabilities of the buffer tank and its associated piping and instrumentation system). During the test, the buffer tank is pre-charged with a suitable gas pressure according to the compressor inlet operating conditions and compressor characteristics. Pre-charging can achieve the effect of rapid start-up testing.

[0047] (3) Start the compressor The compressor is remotely started in the monitoring room, and a low-load test is conducted first. Key parameters of the compressor and test platform are observed on the monitoring screen (compressor: inlet pressure and temperature, interstage pressure and temperature, discharge pressure and temperature, motor speed, hydraulic system parameters, cooling water temperature and pressure, energy consumption, etc.; test platform: pressures before and after the back pressure valve, pressure and temperature of the inlet buffer tank, pressure and temperature of the outlet buffer tank, pressure and temperature of the gas receiver tank, booster parameters, temperatures before and after the cooler, etc.) to assess whether the compressor operation is normal. The low-load test is typically set with an inlet pressure of 1-3 MPa and a discharge pressure of 2-5 MPa. After the low-load test, a loaded operation is performed.

[0048] (4) The test platform (compressor) operates smoothly. After ensuring that the compressor is operating normally and that the control and interlocking logic is correct, adjust the test conditions to make the compressor operate under rated conditions for a period of time.

[0049] The compressor is adjusted according to its test conditions. For example, the test conditions for a liquid-driven compressor are an inlet pressure of 12.5 MPa and an outlet pressure of 45 MPa. The back pressure valve is set to 45 MPa. First, the inlet buffer tank is directly charged through the intermediate-pressure tank of the gas storage cylinder group. When the intermediate-pressure tank pressure is only 0.5 MPa higher than the inlet buffer tank pressure, the high-pressure tank is switched to direct charging until the inlet buffer tank pressure reaches 12.5 MPa and the compressor outlet pressure reaches 45 MPa. If the pressure in the high-pressure tank is lower than 12.5 MPa, and the inlet buffer tank pressure cannot be increased to 12.5 MPa through direct charging, then the booster compressor is started to supply gas to achieve the compressor's test conditions.

[0050] When the compressor test conditions are adjusted to an intake pressure of 10 MPa and an exhaust pressure of 45 MPa, the compressor intake pressure needs to be reduced from 12.5 MPa to 10 MPa. At this time, while keeping the back pressure valve unchanged, the direct charge recovery line can be opened, and the pressure can be slowly reduced to 10 MPa through the pressure regulating valve on the line, thus completing the test condition adjustment.

[0051] Once the test conditions are reached, if the compressor's operating parameters all meet the design requirements under these conditions, it indicates that the compressor is operating stably. The compressor test run time is determined according to relevant standards or by the user.

[0052] (5) Compressor operating condition adjustment After the compressor is running smoothly, the compressor inlet pressure and outlet pressure are increased or decreased according to the test requirements, so that the compressor completes all the specified test conditions.

[0053] During the experiment, the pressure at the compressor's inlet and outlet can be adjusted, and the temperature at the compressor's inlet can also be adjusted within a certain range. The adjustment principle is that the compressor and the test platform form a closed-loop system. When using nitrogen, as the compressor outlet gas changes from high pressure to low pressure, the gas temperature drops significantly due to the Coulomb effect, for example, below 10°C. At this point, the electric heating element on the back pressure valve outlet pipeline can be used to heat the gas, ensuring it reaches the desired temperature, such as 20°C, when it reaches the compressor inlet. When using helium, as the compressor outlet gas changes from high pressure to low pressure, the gas temperature rises significantly due to the anti-Coil effect, for example, above 40°C. In this case, the heat exchangers before and after the back pressure valve can be opened, and the cooling water flow rate adjusted, ensuring the gas reaches the desired temperature, such as 20°C, when it reaches the compressor inlet.

[0054] (6) Compressor shutdown After completing the test conditions, the compressor was remotely shut down from the monitoring room.

[0055] (7) Gas recovery The gas in the inlet buffer tank, outlet buffer tank, and pipeline is recovered. A multi-stage gas recovery function is used to recover as much gas as possible after the test. The main principle is as follows: After the test, when the pressure is high, direct charging is first used to directly recover the gas in the pipeline and buffer tank to the high-pressure tank in the gas storage cylinder group; after the gas pressure reaches equilibrium, the high-pressure tank is switched to the medium-pressure tank, and the gas is directly recovered to the medium-pressure tank in the gas storage cylinder group; after the gas pressure reaches equilibrium, the medium-pressure tank is switched to the low-pressure tank, and the gas is directly recovered to the low-pressure tank in the gas storage cylinder group; after the gas pressure reaches equilibrium, the booster compressor is started, and the gas is recovered to the medium-pressure or low-pressure tank in the gas storage cylinder group. Ultimately, because the booster compressor is hydraulically driven, the gas pressure in the pipeline can be reduced to below 1.0 MPa, achieving the purpose of gas recovery. At the same time, the multi-stage recovery method saves energy.

[0056] (8) Gas venting in pipelines Using the venting system, the active venting valve is remotely controlled to reduce the pressure in the inlet and outlet buffer tanks and pipelines to 0.2 MPa.

[0057] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the present invention, and other modifications can be easily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and examples shown and described herein.

Claims

1. A hydrogen compressor testing device, characterized in that, The system includes a gas storage cylinder group, an inlet buffer tank, a testing machine, an outlet buffer tank, and a back pressure valve, which are connected sequentially by pipelines. There are two sets of inlet buffer tanks and two sets of testing machines connected in parallel. The outlets of the back pressure valves are connected to the two sets of inlet buffer tanks. The inlet and outlet pipelines of the two sets of testing machines have different diameters, so as to control the discharge volume according to the pressure.

2. The hydrogen compressor testing apparatus as described in claim 1, characterized in that, The gas storage cylinder group is also connected to the inlet of the booster, and the outlet of the booster returns to the gas storage cylinder group, while also being connected to the inlets of two sets of inlet buffer tanks.

3. The hydrogen compressor testing apparatus as described in claim 1, characterized in that, Heat exchangers are installed on both the inlet and outlet pipelines of the back pressure valve.

4. The hydrogen compressor testing apparatus as described in claim 1, characterized in that, The testing machine is also connected to an interstage buffer tank.

5. The hydrogen compressor testing apparatus as described in claim 1, characterized in that, The outlets of both sets of inlet buffer tanks are also connected to the gas storage cylinder group via pipelines to achieve gas recovery.

6. The hydrogen compressor testing apparatus as described in claim 1, characterized in that, The gas storage cylinder group is also connected to the gas collection compartment.

7. The hydrogen compressor testing apparatus as described in claim 1, characterized in that, It also includes a monitoring and control system, which comprises a monitoring system for the testing machine and a monitoring system for the platform. The monitoring system for the testing machine is used to monitor the parameters of the compressor, including inlet pressure and temperature, interstage pressure and temperature, exhaust pressure and temperature before and after exhaust cooling, motor speed, hydraulic system parameters, and energy consumption. The monitoring system for the platform includes monitoring parameters such as pressure before and after the back pressure valve, pressure and temperature of the inlet buffer tank, pressure and temperature of the outlet buffer tank, pressure and temperature of the gas storage cylinder group, booster parameters, and temperature before and after the chiller.

8. A method for conducting hydrogen compressor tests using a hydrogen compressor testing device, characterized in that, Includes the following steps: Step 1: After confirming that the start-up conditions meet the requirements, pre-charge the buffer tank; Step 2: Start the compressor and conduct a low-load test first. After the compressor is found to be running normally, conduct a compressor load test. Adjust the test conditions according to the compressor's test conditions, so that the compressor runs under the set rated conditions for the set time. Step 3: After the compressor is running smoothly, adjust it to the remaining test conditions of the testing machine according to the test requirements, and conduct the test until all the specified test conditions are completed. Then, turn off the compressor. The adjustment of the testing machine includes: when the intake pressure needs to be increased, adjust the back pressure valve pressure to the exhaust pressure, and adjust the pressure to the test condition through staged direct charging and booster air replenishment. When the intake pressure needs to be reduced, adjust the back pressure valve pressure to the exhaust pressure, and adjust the pressure to the test condition through the recovery pipeline. Step 4: Recover the gas in the test device and vent the gas in the pipeline.

9. The method for conducting hydrogen compressor tests using the hydrogen compressor test apparatus as described in claim 8, characterized in that, The pre-filling of the buffer tank in step one is specifically as follows: first, directly fill it with the low-pressure cylinder group; when the pressure of the buffer tank and the low-pressure cylinder group is balanced, switch to the medium-pressure cylinder group for direct filling; when the pressure of the buffer tank and the medium-pressure cylinder group is balanced, switch to the high-pressure cylinder group for direct filling; when the pressure of the buffer tank and the high-pressure cylinder group is balanced, use a booster to pressurize and replenish the gas.

10. The method for conducting hydrogen compressor tests using a hydrogen compressor test apparatus as described in claim 8, characterized in that, In step four, the gas recovery adopts a multi-stage recovery method, specifically: after the test, when the pressure is high, the gas in the pipeline and buffer tank is first directly charged back to the high-pressure tank in the gas storage cylinder group; after the gas pressure reaches equilibrium, the high-pressure tank is switched to the medium-pressure tank, and the gas is directly charged back to the medium-pressure tank in the gas storage cylinder group; after the gas pressure reaches equilibrium, the medium-pressure tank is switched to the low-pressure tank, and the gas is directly charged back to the low-pressure tank in the gas storage cylinder group; after the gas pressure reaches equilibrium, the booster is started, and the booster is used to recover the gas to the medium-pressure tank or low-pressure tank in the gas storage cylinder group so that the gas pressure in the pipeline reaches below 1.0 MPa, thus completing the gas recovery.

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