A gas cylinder permeation test system and test method

Abstract

This invention discloses a gas cylinder permeation test system and method, relating to the field of hydrogen storage cylinder permeation testing. The system includes a test environment control module, whose permeation chamber holds the test cylinder and provides the required ambient temperature, capable of replacing the permeation chamber with an inert gas at a set pressure. A sampling control module, connected to the permeation chamber, extracts the gas from the permeation chamber for analysis. A test cylinder control module fills the test cylinder with test gas and maintains the pressure inside the test cylinder at a set value. A data acquisition and control system controls the test environment control module, the sampling control module, and the test cylinder control module, acquiring the pressure inside the permeation chamber, the temperature inside the permeation chamber, and the pressure inside the test cylinder. It can also calculate the permeability of the test cylinder by combining the gas extracted from and analyzed from the permeation chamber. This gas cylinder permeation test system and method enables automatic and continuous measurement, with high safety and efficiency during the testing process.

Description

Technical Field

[0001] This invention relates to the field of hydrogen storage cylinder permeation testing technology, and in particular to a cylinder permeation testing system and method. Background Technology

[0002] Type IV gas cylinders (plastic-lined carbon fiber fully wound gas cylinders) are a new type of high-pressure gas storage cylinder. With their excellent hydrogen storage density and lightweight core advantages, they have become the preferred solution for high-pressure hydrogen / natural gas storage in passenger cars and other vehicles.

[0003] Unlike traditional metal-lined gas cylinders, the plastic liner material of Type IV cylinders has a much higher permeability to hydrogen and CNG than metal materials. Excessive permeability can lead to gas leakage and loss, potentially posing safety risks and severely impacting the cylinder's reliability and lifespan. Therefore, during the initial design phase, material selection optimization (such as adding a barrier layer), and product qualification verification of Type IV cylinders, it is essential to conduct reliable and high-precision permeability tests to accurately assess their permeability.

[0004] In existing technologies, the permeation test methods for Type IV gas cylinders generally suffer from problems such as low automation, discontinuous test data, and insufficient measurement accuracy. On the one hand, the test process relies on manual operations such as nitrogen replacement, gas filling and releasing, pressure control, and sample collection, which not only leads to low test efficiency but also easily causes data fluctuations due to differences in human operation, affecting the accuracy and repeatability of measurement results. On the other hand, the existing test equipment has insufficient precision in controlling the ambient temperature and uncontrollable sampling frequency, making it difficult to meet the requirements of permeation tests under extreme temperature conditions in different standards.

[0005] Therefore, there is an urgent need to design a technical solution that can achieve automatic and continuous measurement, high safety, and high testing efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a gas cylinder permeation test system and method to solve the problems existing in the prior art, enabling automatic and continuous measurement, and ensuring high safety and efficiency in the test process.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention provides a gas cylinder permeation testing system, comprising:

[0009] The test environment control module includes a permeation chamber, which is used to place test bottles and provide the ambient temperature required for the test, and can replace the gas in the permeation chamber with an inert gas at a set pressure.

[0010] A sampling control module, connected to the permeation chamber, is used to extract gas from the permeation chamber for gas composition analysis.

[0011] The test bottle control module is used to fill the test bottle with test gas and maintain the gas pressure inside the test bottle at a set value.

[0012] The system also includes a data acquisition and control system for controlling the test environment control module, the sampling control module, and the test bottle control module. The system acquires the gas pressure inside the permeation chamber, the temperature inside the permeation chamber, and the gas pressure inside the test bottle through the test environment control module, the sampling control module, and the test bottle control module. It can also calculate the permeability of the test bottle by combining the gas extracted and analyzed from the permeation chamber.

[0013] Preferably, the permeation chamber is a sealed horizontal chamber structure, which is equipped with a temperature control module that can regulate the internal temperature of the permeation chamber to a set value; the permeation chamber is equipped with end caps that can be quickly disassembled at both ends.

[0014] Preferably, the sampling control module includes a diaphragm pump and a gas chromatograph; the permeation chamber is provided with a sample collection port and a sample return port, the sample collection port is connected to the sample return port through an external circulation pipeline, the diaphragm pump is provided on the circulation pipeline, the circulation pipeline located between the sample return port and the diaphragm pump is connected to a sampling branch, and the sampling branch is connected to the gas chromatograph through a sampling control valve.

[0015] Preferably, the test bottle control module includes a gas filling / discharging port, a power interface, and a vent port on the permeation chamber. One end of the gas filling / discharging port is connected to a gas supply system, and the other end is connected to the bottle valve of the test bottle. The power interface is connected to the bottle valve and is used to control the power supply to the bottle valve and to collect the valve temperature. One end of the vent port is connected to the pressure relief port of the safety pressure relief device on the bottle valve, and the other end is connected to a vent pipe to discharge the test gas in the test bottle to a set position in case of overheating.

[0016] Preferably, the gas supply system includes a pressurization path and a venting path; the pressurization path includes a gas source, a shut-off valve, a pressurization pump, a gas control valve, and a pressure sensor, which can pressurize the gas source to a specified pressure through the pressurization pump and fill the test bottle; the venting path is equipped with a proportional valve, a pressure reducing valve, and a flow meter, which can control the pressure relief flow through the proportional valve and control the pressure of the venting pipeline through the pressure reducing valve, so as to discharge the test gas in the test bottle to a set position.

[0017] Preferably, the test environment control module further includes a gas replacement valve and a vent valve installed on the permeation chamber. The gas replacement valve is externally connected to an inert gas storage cylinder, and the vent valve is externally connected to an venting pipeline. The permeation chamber is equipped with a chamber temperature sensor and a chamber pressure sensor to monitor the temperature and pressure inside the permeation chamber.

[0018] Preferably, the permeation chamber is equipped with a rupture disc, which is connected to the venting pipeline.

[0019] Preferably, the temperature control module includes an explosion-proof heating cable and an insulation layer. The explosion-proof heating cable is wrapped around the outside of the permeation chamber. The explosion-proof heating cable is connected to a power source. The insulation layer covers the outside of the explosion-proof heating cable to provide the ambient temperature required for the test.

[0020] Preferably, the data acquisition and control system includes a touch screen, which can display the acquired data, input relevant information of the test bottles, set the detection time interval, and start the gas chromatograph.

[0021] The present invention also provides a method for gas cylinder permeation testing, comprising the following steps:

[0022] Before the test, place the test bottle to be tested in the permeation chamber, and connect the power interface, gas filling port and venting port on the permeation chamber to the test bottle, and then seal the permeation chamber;

[0023] The test bottle control module is controlled by the data acquisition and control system to fill the test bottle with hydrogen to the set pressure, then the hydrogen filling is stopped and the test bottle is pressure maintained.

[0024] The data acquisition and control system controls the test environment control module to replace the air in the permeation chamber with nitrogen at a set pressure.

[0025] The test environment control module is controlled by the data acquisition and control system to set and maintain the permeation chamber at the set temperature requirements.

[0026] The sampling control module controls the gas in the chamber to continuously circulate and permeate the gas through a diaphragm pump during the experiment to make the gas uniform; the sampling control valve controls the sampling interval and sends the gas into the gas chromatograph at fixed time intervals for gas composition measurement.

[0027] The data acquisition and control system calculates the average permeation rate over a fixed interval based on the hydrogen concentration returned by the chamber pressure sensor, chamber temperature sensor, gas chromatograph, and the remaining volume of the permeation chamber. This is used to determine whether the permeation is stable and whether the permeation rate is up to standard.

[0028] After the experiment, the bottle valve was opened through the data acquisition and control system to depressurize the test bottle, and the vent valve of the permeation chamber was opened to vent the gas in the chamber.

[0029] Then, the permeation chamber is replaced with nitrogen gas through the gas replacement valve, and then emptied. After confirming that the hydrogen concentration in the chamber is at a safe level, the permeation chamber is opened and the test bottle is taken out.

[0030] The present invention achieves the following technical effects compared to the prior art:

[0031] This invention places the test vial within a permeation chamber, and then uses a data acquisition and control system to perform nitrogen purging, ambient temperature control, hydrogen filling and releasing, and pressure maintenance on the test vial. It also controls the sampling frequency of the gas chromatograph, thereby enabling uninterrupted gas cylinder permeation testing. This reduces data instability caused by manual operation, improves testing efficiency, and minimizes safety hazards. It achieves automatic and continuous measurement of the permeation amount of the test vial under different ambient temperatures. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structural layout of the gas cylinder permeation test system in one or more embodiments of the present invention. Figure 1 (Front-line perspective);

[0034] Figure 2 This is a schematic diagram of the structural layout of the gas cylinder permeation test system in one or more embodiments of the present invention. Figure 2 (Top-down view);

[0035] Figure 3 This is a schematic diagram of the data acquisition and control system connection in one or more embodiments of the present invention;

[0036] Figure 4 This is a schematic diagram of a partial arrangement of the piping of the test bottle control module in one or more embodiments of the present invention;

[0037] Figure 5 This is a schematic diagram of the sample sampling control module and sampling circuit in one or more embodiments of the present invention;

[0038] In the diagram: 1-Acquisition and control system, 2-Experimental environment control module, 3-Sampling control module, 4-Test bottle control module, 5-Temperature control module, 6-Permeation chamber, 7-Test bottle, 8-Sample collection port, 9-Sample reflux port, 10-Diaphragm pump, 11-Gas chromatograph, 12-Sampling control valve, 13-Chamber temperature sensor, 14-Chamber pressure sensor, 15-Rupture disc, 16-Relief valve, 17-Gas replacement valve, 18-Power interface, 19-Charging / discharging port, 20-Relief port, 21-Hydrogen source, 22-Nitrogen source, 23-Booster pump, 24-Stop valve, 25-Proportional valve, 26-Pressure reducing valve, 27-Flow meter, 28-Pneumatic control valve, 29-Pressure sensor. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0040] The purpose of this invention is to provide a gas cylinder permeation test system and method to solve the problems existing in the prior art, enabling automatic and continuous measurement, and ensuring high safety and efficiency in the test process.

[0041] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Existing technologies for permeation testing of Type IV gas cylinders generally suffer from problems such as low automation, discontinuous test data, and insufficient measurement accuracy. To address these issues, this invention provides a gas cylinder permeation testing system suitable for Type IV gas cylinder permeation testing. Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the system includes a test environment control module 2, a sampling control module 3, a test bottle control module 4, and a data acquisition and control system 1. The test environment control module 2 includes a permeation chamber 6, which is used to place the test bottle 7 and provides the required ambient temperature for the test. The test environment control module 2 can replace the gas in the permeation chamber 6 with an inert gas at a set pressure. The sampling control module 3 is connected to the permeation chamber 6 and is used to extract the gas in the permeation chamber 6 for gas composition analysis. The test bottle control module 4 is used to fill and release the test gas into the test bottle 7 and maintain the gas pressure in the test bottle 7 at a set value. The data acquisition and control system 1 includes a controller composed of a mature existing computer or microcontroller, which is used to control the test environment control module 2, the sampling control module 3, and the test bottle control module 4. It also obtains the gas pressure in the permeation chamber 6, the temperature in the permeation chamber 6, and the gas pressure in the test bottle 7 through the test environment control module 2, the sampling control module 3, and the test bottle control module 4, and can calculate the permeability of the test bottle by combining the gas extracted and analyzed from the permeation chamber 6. This invention involves placing the test vial in a permeation chamber 6, then using a data acquisition and control system 1 to perform nitrogen purging and ambient temperature control in the chamber 6, hydrogen filling and pressure maintenance on the test vial 7, and controlling the sampling frequency of the gas chromatograph 11. This allows for uninterrupted gas cylinder permeation testing, reducing data instability caused by manual operation, improving testing efficiency, and minimizing safety hazards. It also enables automatic and continuous measurement of the permeation amount of the test vial under different ambient temperatures.

[0043] In some embodiments, the permeation chamber 6 is a sealed horizontal chamber structure, which is equipped with a temperature control module 5 that is communicatively connected to the data acquisition and control system 1. The temperature control module 5 can regulate the internal temperature of the permeation chamber 6 to a set value. In this embodiment, the temperature control module 5 includes an explosion-proof heating cable and an insulation layer. The explosion-proof heating cable is wrapped around the outside of the permeation chamber 6 and is connected to a power source. The outside of the explosion-proof heating cable is covered with an insulation layer to provide the ambient temperature required for the test. The permeation chamber 6 is equipped with a chamber temperature sensor 13 to monitor the temperature inside the permeation chamber 6 and transmit the monitored values ​​to the data acquisition and control system 1. The temperature inside the permeation chamber 6 is regulated according to the monitored values. The permeation chamber 6 is equipped with quick-release caps at both ends. The caps are quick-release structures, which can be started quickly and reduce the safety hazards caused by opening time. They are used for sample entry and exit and for partial leak detection of the bottle mouth valve and bottle tail valve of the test bottle 7. They should be able to seal and withstand a pressure of more than 1 MPa inside.

[0044] In some embodiments, the sampling control module 3 includes a diaphragm pump 10 and a gas chromatograph 11; the permeation chamber 6 has a sample collection port 8 and a sample return port 9. The sample collection port 8 is connected to the sample return port 9 through an external circulation pipeline. The circulation pipeline is equipped with a diaphragm pump 10. A sampling branch is connected to the circulation pipeline between the sample return port 9 and the diaphragm pump 10. The sampling branch is connected to the gas chromatograph 11 through a sampling control valve 12. The diaphragm pump 10 between the sample collection port 8 and the sample return port 9 realizes the self-circulation of gas in the permeation chamber 6. The sampling branch is close to the gas chromatograph 11 to reduce the gas replacement time and gas loss in the pipeline during each test.

[0045] In some embodiments, the test bottle control module 4 includes a gas filling / discharging port 19, a power interface 18, and a vent 20 located on the permeation chamber 6. One end of the gas filling / discharging port 19 is connected to a gas supply system, with the test gas source being a hydrogen cylinder or a natural gas cylinder, used for conducting permeation tests with hydrogen or compressed natural gas respectively. The other end is connected to the bottle neck valve of the test bottle 7. The power interface 18 is connected to the bottle neck valve, which is equipped with a temperature sensor. The power interface 18, connected to the bottle neck valve, can control the on / off power supply of the bottle neck valve and can also collect data from the temperature sensor of the bottle neck valve to monitor the temperature inside the bottle. A safety pressure relief device is provided at the bottle neck valve. One end of the vent 20 is connected to the pressure relief port of the safety pressure relief device, and the other end is connected to a venting pipeline. The safety pressure relief device is a safety accessory that will generally open directly in case of overheating (rapid hydrogen addition, runaway temperature in the permeation chamber, or other unexpected situations) to release the test gas in the test bottle 7 to a set position. The venting pipeline uses a high-pressure rigid pipe.

[0046] In some implementations, such as Figure 3As shown, the test bottle control module 4 is equipped with a gas supply system, which includes a pressurization path and a venting path connected to the bottle valve, as well as a hydrogen source 21, a CNG source, a nitrogen source 22, a booster pump 23, etc. In some embodiments, the pressurization path includes a gas source, a shut-off valve, a booster pump 23, a pneumatic control valve, and a pressure sensor. The gas source is either a hydrogen source 21 or a nitrogen source 22, which can pressurize the gas source to a specified pressure through the booster pump 23 and fill it into the test bottle 7. The venting line is equipped with a proportional valve, a pressure reducing valve, and a flow meter, which can control the pressure relief flow through the proportional valve and control the pressure of the venting line through the pressure reducing valve to discharge the test gas in the test bottle 7 to a set position. The aforementioned structure of the test bottle control module 4 is used for nitrogen purging, hydrogen filling, maintaining the internal pressure of the test bottle 7, and depressurizing at a specified rate in the test bottle 7. In this embodiment, the hydrogen source 21 and the CNG source are respectively connected to the booster pump 23 through pipelines, and a shut-off valve 24 is provided on the pipeline between the nitrogen source 22 and the booster pump 23 for easy on / off control; the booster pump 23 is connected to the bottle valve of the test bottle 7 through a pipeline equipped with a pneumatic control valve 28 and a booster interface, and a pressure sensor 29 is provided on this pipeline for easy adjustment of the inlet pressure; the pipeline between the booster pump 23 and the pneumatic control valve 28... A proportional valve 25 is installed on the pipeline. The proportional valve 25 is connected to an external discharge pipeline via a pipe equipped with a pressure reducing valve 26 and a flow meter 27. This allows for the regulation of the type of gas introduced into the test bottle 7 and the gas release rate, enabling gas replacement within the test bottle 7. The replacement process involves introducing hydrogen, nitrogen, or compressed natural gas into the test bottle 7, filling it to a set pressure, and then releasing the gas through the proportional valve 25, pressure reducing valve 26, and flow meter 27. The gas is then refilled until the discharged gas contains only the introduced hydrogen, nitrogen, or compressed natural gas, thus completing the gas replacement within the test bottle 7. In this embodiment, the gas release pipeline is equipped with a proportional valve 25, a pressure reducing valve 26, and a flow meter 27. The proportional valve 25 controls the pressure release flow rate, and the pressure reducing valve 26 controls the pressure in the gas release pipeline, preventing bubbling failure of the plastic inner liner of the test bottle 7 due to excessively rapid gas release.

[0047] In some embodiments, the test environment control module 2 further includes a gas replacement valve 17 and a vent valve 16 disposed on the permeation chamber 6. The gas replacement valve 17 is externally connected to an inert gas storage cylinder. In this embodiment, the inert gas storage cylinder is a nitrogen cylinder containing nitrogen. The vent valve 16 is externally connected to an venting pipeline. The permeation chamber 6 is equipped with a chamber temperature sensor 13 and a chamber pressure sensor 14 to monitor the temperature and pressure inside the permeation chamber 6. The permeation chamber 6 is equipped with a rupture disc 15, which is connected to the venting pipeline. When an abnormality occurs in the test bottle or the test, causing the pressure inside the permeation chamber 6 to rise rapidly beyond the design pressure, and the vent valve 16 is insufficient to release the pressure, the rupture disc 15 will burst, releasing the pressure inside the chamber. The permeation chamber 6 is equipped with a chamber pressure sensor 14. When the pressure inside the permeation chamber 6 is too high during the test, exceeding a certain value, the data acquisition and control system 1 can control the vent valve 16 to release the pressure inside the chamber, and can also actively release the test gas in the test bottle 7 at the same time.

[0048] The data acquisition and control system 1 in this embodiment includes a touch screen, which can display the acquired data, input relevant information of the test bottle, set the detection time interval, start the gas chromatograph 11, and query historical data.

[0049] The present invention also provides a method for gas cylinder permeation testing, comprising the following steps:

[0050] Before the test, place the test bottle 7 to be tested in the permeation chamber 6, and connect the power interface 18, the gas filling port 19, and the venting port 20 on the bottle mouth valve of the test bottle 7 to the power interface 18 and the gas filling port 19 on the corresponding permeation chamber 6, and then seal the permeation chamber 6.

[0051] The control system 1 controls the filling and discharging control valve in test bottle 7 to fill it with hydrogen, monitors the value of pressure sensor 29 on test bottle 7, and closes the filling and discharging control valve when the test pressure is reached to maintain the pressure in test bottle 7. The test sample is a Type IV hydrogen storage cylinder. During the test, the pressure will drop because hydrogen permeates through the cylinder wall into the permeation chamber 6. Therefore, if the value returned by pressure sensor 29 of test bottle 7 is lower than the requirement, the filling and discharging control valve will be opened to replenish the hydrogen.

[0052] The data acquisition and control system 1 controls the test environment control module 2 to open the nitrogen replacement valve and fill the permeation chamber 6 with nitrogen to the specified replacement pressure. The nitrogen replacement valve is then closed, and the pressure is maintained for a period of time to confirm that there are no leaks in the chamber. Then, the vent valve 16 is opened to release the gas inside the chamber. This process is repeated 3-5 times to replace the air inside the chamber with nitrogen.

[0053] The test environment control module 2 is controlled by the data acquisition and control system 1 to set and maintain the permeation chamber 6 to meet the standard temperature requirements.

[0054] The sampling control module 3 controls the sampling control system 1 to continuously circulate the gas in the permeation chamber 6 through the diaphragm pump 10 to make the gas in the chamber uniform; the sampling control valve 12 controls the sampling interval and sends the gas into the gas chromatograph 11 at fixed time intervals for gas composition measurement.

[0055] The data acquisition and control system 1 calculates the average permeation rate over a fixed interval based on the hydrogen concentration returned by the chamber pressure sensor 14, the chamber temperature sensor 13, and the gas chromatograph 11, as well as the remaining volume of the permeation chamber 6, in order to determine whether the permeation is stable and whether the permeation rate is up to standard.

[0056] During the test, when the permeation volume of test bottle 7 exceeded the limit, the permeation chamber 6 approached the activation pressure of the rupture disc 15. At this point, the relief valve 16 was opened to release the pressure inside the permeation chamber 6. Test bottle 7 experienced a large leakage, and the rupture disc 15 of the permeation chamber 6 activated to release the overpressure gas. The safety pressure relief device of test bottle 7 activated unexpectedly, and the gas was discharged outdoors through the relief pipeline of the permeation chamber 6.

[0057] After the experiment, the proportional valve and pressure reducing valve were opened via the data acquisition and control system 1, and the valve at the mouth of test bottle 7 was opened to release pressure. The gas inside the chamber was emptied, and then the nitrogen was replaced with nitrogen through the nitrogen replacement valve, and then emptied again. After confirming that the hydrogen concentration inside the chamber was at a safe level, the permeation chamber 6 was opened and test bottle 7 was removed.

[0058] This invention enables automatic and continuous measurement of the permeation rate of Type IV gas cylinders under different ambient temperatures. Personnel are not involved in close-range operations during the testing process, and reliable safety measures are in place to ensure the safety of both the experiment and personnel.

[0059] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A gas cylinder permeation test system, characterized by: include: The test environment control module includes a permeation chamber for placing test bottles and providing the required ambient temperature for the test, and is capable of replacing the gas in the permeation chamber with an inert gas at a set pressure; the test environment control module also includes a vent valve on the permeation chamber, the vent valve being connected to an external venting pipeline, and a rupture disc on the permeation chamber connected to the venting pipeline. A sampling control module, connected to the permeation chamber, is used to extract gas from the permeation chamber for gas composition analysis. The sampling control module includes a diaphragm pump and a gas chromatograph. The permeation chamber has a sample collection port and a sample return port. The sample collection port is connected to the sample return port through an external circulation pipeline. The diaphragm pump is installed on the circulation pipeline. A sampling branch is connected to the circulation pipeline between the sample return port and the diaphragm pump. The sampling branch is connected to the gas chromatograph through a sampling control valve. The test bottle control module is used to fill the test bottle with test gas and maintain the gas pressure inside the test bottle at a set value. The system also includes a data acquisition and control system for controlling the test environment control module, the sampling control module, and the test bottle control module. The system acquires the gas pressure inside the permeation chamber, the temperature inside the permeation chamber, and the gas pressure inside the test bottle through the test environment control module, the sampling control module, and the test bottle control module. It can also calculate the permeability of the test bottle by combining the gas extracted and analyzed from the permeation chamber. The test bottle is equipped with a temperature sensor at its mouth valve to monitor the internal temperature of the test bottle. The test bottle control module includes an inflation / deflation port on the permeation chamber. One end of the inflation / deflation port is connected to an external gas supply system. The gas supply system includes a deflation path. The deflation path is equipped with a proportional valve and a flow meter. The proportional valve can control the pressure relief flow rate to regulate the deflation rate of the test bottle. The permeation chamber is equipped with a temperature control module, which can regulate the internal temperature of the permeation chamber to a set value; the temperature control module includes an explosion-proof heat tracing cable, which is wrapped around the outside of the permeation chamber.

2. The gas cylinder permeation test system of claim 1, wherein: The infiltration chamber is a sealed horizontal chamber structure, and both ends of the infiltration chamber are equipped with end caps that can be quickly disassembled.

3. The gas cylinder permeation test system according to claim 1, characterized in that: The test bottle control module includes a power interface and a vent port on the permeation chamber. The other end of the filling / discharging port is connected to the bottle valve of the test bottle. The power interface is connected to the bottle valve and is used to control the power supply to and off of the bottle valve and to collect the valve temperature. One end of the vent port is connected to the pressure relief port of the safety pressure relief device on the bottle valve, and the other end is connected to a vent pipe to discharge the test gas in the test bottle to a set position in case of overheating.

4. The gas cylinder permeation test system according to claim 3, characterized in that: The gas supply system includes a pressurization path and a venting path; the pressurization path includes a gas source, a shut-off valve, a pressurization pump, a gas control valve, and a pressure sensor, which can pressurize the gas source to a specified pressure and fill the test bottle through the pressurization pump; the venting path is equipped with a pressure reducing valve, which controls the pressure of the venting pipeline to discharge the test gas in the test bottle to a set position.

5. The gas cylinder permeation test system according to claim 3, characterized in that: The test environment control module also includes a gas replacement valve installed on the permeation chamber. The gas replacement valve is externally connected to an inert gas storage cylinder. The permeation chamber is equipped with a chamber temperature sensor and a chamber pressure sensor to monitor the temperature and pressure inside the permeation chamber.

6. The gas cylinder permeation test system according to claim 2, characterized in that: The temperature control module includes an explosion-proof heating cable, which is connected to an external power source. The outer side of the explosion-proof heating cable is covered with an insulation layer to provide the ambient temperature required for the test.

7. The gas cylinder permeation test system according to claim 1, characterized in that: The data acquisition and control system includes a touch screen, which can display the acquired data, input relevant information of the test bottles, set the detection time interval, and start the gas chromatograph.

8. A gas cylinder permeation test method based on the gas cylinder permeation test system according to any one of claims 1 to 7, characterized in that: Includes the following steps: Before the test, place the test bottle to be tested in the permeation chamber, and connect the power interface, gas filling port and venting port on the permeation chamber to the test bottle, and then seal the permeation chamber; The test bottle control module is controlled by the data acquisition and control system to fill the test bottle with hydrogen to the set pressure, then the hydrogen filling is stopped and the test bottle is pressure maintained. The data acquisition and control system controls the test environment control module to replace the air in the permeation chamber with nitrogen at a set pressure. The test environment control module is controlled by the data acquisition and control system to set and maintain the permeation chamber at the set temperature requirements. The sampling control module controls the gas in the chamber to continuously circulate and permeate the gas during the experiment through a diaphragm pump to make the gas in the chamber uniform; the sampling control valve controls the sampling interval and sends the gas into the gas chromatograph at fixed time intervals for gas composition measurement. The data acquisition and control system calculates the average permeation rate over a fixed interval based on the hydrogen concentration returned by the chamber pressure sensor, chamber temperature sensor, gas chromatograph, and the remaining volume of the permeation chamber. This is used to determine whether the permeation is stable and whether the permeation rate is up to standard. After the experiment, the bottle valve was opened through the data acquisition and control system to depressurize the test bottle, and the vent valve of the permeation chamber was opened to vent the gas in the chamber. Then, the permeation chamber is replaced with nitrogen gas through the gas replacement valve, and then emptied. After confirming that the hydrogen concentration in the chamber is at a safe level, the permeation chamber is opened and the test bottle is taken out.

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