Hydrogen cycle test system for high-pressure hydrogen storage cylinder

Abstract

The invention relates to the technical field of hydrogen storage cylinder testing, in particular to a hydrogen cycle testing system for a high-pressure hydrogen storage cylinder. The system comprises a parameter monitoring module which is used for monitoring an environment parameter set and a test parameter set of a tested hydrogen cylinder group and recording a static parameter set; after the pressurization maintaining module receives the pressurization signal, the detected hydrogen cylinder group is subjected to multi-stage peak shifting type filling, and the gas pressure in the detected hydrogen cylinder group is maintained within the preset maintaining time; after receiving the pressure relief signal, the exhaust control module performs multi-stage step-by-step pressure relief on the tested hydrogen cylinder group; the leakage monitoring module receives and analyzes the environmental parameter set, the test parameter set and the static parameter set, determines a real-time leakage risk, and controls the pressurization maintaining module or the exhaust control module to start and stop according to the real-time leakage risk; and the performance analysis module analyzes the test parameter set and the environment parameter set after receiving the detection completion signal, and determines and outputs a test report. According to the invention, the safety risk caused by hydrogen burst can be obviously reduced.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen storage cylinder testing, and in particular to a hydrogen circulation testing system for high-pressure hydrogen storage cylinders. Background Art

[0002] As the global demand for clean energy increases, hydrogen energy, as a potential zero-emission energy source, has received widespread attention. However, the use of hydrogen energy requires safe and efficient hydrogen storage technology, among which high-pressure hydrogen storage cylinders are one of the important carriers of hydrogen energy.

[0003] Hydrogen storage cylinders need to work in a high-pressure environment, and their safety is of vital importance. The hydrogen storage performance of hydrogen storage cylinders in a high-pressure environment can be verified through cyclic testing of hydrogen storage cylinders. In the process of cyclic testing of hydrogen storage cylinders, the existing technology has a significant lag in the leakage monitoring of hydrogen storage cylinders, and is unable to reduce the safety hazards caused by sudden hydrogen leakage. Summary of the invention

[0004] The present application provides a high-pressure hydrogen storage cylinder hydrogen circulation test system to solve the above-mentioned technical problems.

[0005] In a first aspect, the present application provides a high-pressure hydrogen storage cylinder hydrogen cycle testing system, the system comprising: The parameter monitoring module is used to monitor the environmental parameter set inside the environmental box and the test parameter set of the hydrogen cylinder group under test, and record the static parameter set of the hydrogen cylinder group under test, and send a pressurization signal after recording the static parameter set; A pressurization and maintenance module, which is connected to the parameter monitoring module, and is used to perform multi-stage peak-shifting filling on the hydrogen cylinder group under test in the environmental box after receiving the pressurization signal, and maintain the gas pressure in the hydrogen cylinder group under test within a preset holding time, and send a pressure relief signal after the preset holding time has passed; an exhaust control module, which is connected to the pressurization and maintenance module and the parameter monitoring module, and is used to perform multi-stage step-by-step pressure relief on the hydrogen cylinder group under test in the environmental box after receiving the pressure relief signal, and send a detection completion signal after the internal pressure of the hydrogen cylinder group is reduced to within a preset pressure range; A leakage monitoring module, which is connected to the parameter monitoring module, the pressurization and maintenance module and the exhaust control module, and is used to receive and analyze the environmental parameter set, the test parameter set and the static parameter set during the filling and depressurization process, determine the real-time leakage risk, and control the start and stop of the pressurization and maintenance module or the exhaust control module according to the real-time leakage risk; The performance analysis module is connected to the parameter monitoring module and the exhaust control module, and is used to analyze the test parameter set and the environmental parameter set after receiving the detection completion signal, and determine and output a test report.

[0006] Through this scheme, before the cyclic test, a series of static parameters of the hydrogen cylinder group under test are recorded through the parameter monitoring module, and the pressurization holding module and the exhaust control module are controlled respectively to perform multi-stage staggered filling and multi-stage step-by-step pressure relief on the hydrogen cylinders under test, so as to improve the filling and pressure relief efficiency. At the same time, the filling and pressure relief characteristics of the hydrogen cylinder group during actual use are simulated to make the cyclic test results authentic and representative. During the filling and pressure relief process, the parameter monitoring module is used to continuously collect environmental parameters and test parameters. The leakage monitoring module is used to perform dynamic comprehensive analysis of the environmental parameter set, test parameter set and static parameter set, and a test report is output to determine the real-time leakage risk of the hydrogen cylinder group under test during the cyclic test, significantly reduce the safety risks brought by hydrogen sudden leakage, and effectively solve the problem of lag in leakage risk monitoring.

[0007] Optionally, the pressurization and maintaining module includes a primary pressurization unit, a secondary pressurization unit, a tertiary pressurization unit, and a pressurization monitoring unit; the pressurization monitoring unit is connected to the primary pressurization unit, the secondary pressurization unit, and the tertiary pressurization unit, respectively; The pressurization monitoring unit is used to monitor the pressure in the hydrogen cylinder under test during the pressurization process. When the pressure in the hydrogen cylinder group under test reaches the first-level pressure threshold, the first-level pressurization unit is controlled to stop filling and a second-level pressurization signal is sent to the second-level pressurization unit. When the pressure in the tested hydrogen cylinder group reaches the second-level pressure threshold, the first-level pressurizing unit is controlled to stop filling, and a third-level pressurizing signal is sent to the third-level pressurizing unit; When the pressure in the tested hydrogen cylinder group reaches the third-level pressure threshold, the third-level pressurizing unit is controlled to stop filling.

[0008] Through this solution, the pressurization monitoring unit is used to dynamically adjust the intervention timing of the first-level pressurization unit, the second-level pressurization unit and the third-level pressurization unit in the multi-stage filling process according to the first-level air pressure threshold, the second-level air pressure threshold and the third-level air pressure threshold, so as to improve the accuracy of the multi-stage filling process.

[0009] Optionally, the first-level pressurizing unit is used to control the low-pressure hydrogen storage cylinder group to perform low-pressure filling on the tested hydrogen cylinder group according to the low-pressure filling time and the low-pressure filling pressure; The secondary pressurizing unit is used to control the medium-pressure hydrogen storage cylinder group to perform medium-pressure filling on the hydrogen cylinder group under test according to the medium-pressure filling time and the medium-pressure filling pressure after receiving the secondary pressurizing signal; The three-stage pressurizing unit is used to control the high-pressure hydrogen storage cylinder group to perform high-pressure filling on the tested hydrogen cylinder group according to the high-pressure filling time and the high-pressure filling pressure after receiving the three-stage pressurizing signal.

[0010] Through this scheme, the first-stage pressurizing unit, the second-stage pressurizing unit and the third-stage pressurizing unit are used respectively to fill the hydrogen cylinder group under test according to their corresponding different filling times and filling pressures. On the basis of multi-stage filling, staggered filling of the hydrogen cylinder group under test is achieved to reflect the performance of the hydrogen cylinder group under different filling pressures, while improving the filling efficiency and reducing energy consumption.

[0011] Optionally, the pressurization and maintenance module further includes a low-pressure recovery unit; The low-pressure recovery unit is used to control the low-pressure recovery gas cylinder to recover and temporarily store excess hydrogen during the cycle test process.

[0012] Through this solution, a low-pressure recovery unit is used to recover excess hydrogen generated by gas loss during the cycle test through a low-pressure recovery gas cylinder, thereby improving the safety of the cycle test process while reducing the cost waste caused by gas loss. At the same time, it provides an indirect basis for the subsequent assessment of the leakage risk of the hydrogen cylinder being tested.

[0013] Optionally, the exhaust control module includes a primary pressure relief unit, a secondary pressure relief unit and a pressure relief monitoring unit; The pressure relief monitoring unit is used to monitor the pressure in the tested hydrogen cylinder during the pressure relief process. When the pressure in the tested hydrogen cylinder drops to the first-level pressure relief threshold, the first-level pressure relief unit is controlled to stop pressure relief, and the second-level pressure relief signal is sent to the second-level pressure relief unit. When the pressure in the tested hydrogen cylinder drops to the normal pressure range, the second-level pressure relief unit is controlled to stop pressure relief. The first-level pressure relief unit is used to transmit the high-pressure gas in the tested hydrogen cylinder to the medium-pressure hydrogen storage cylinder group and the high-pressure hydrogen storage cylinder group; The secondary pressure relief unit is used to transmit the low-pressure gas in the tested hydrogen cylinder to the low-pressure hydrogen storage cylinder group, the medium-pressure hydrogen storage cylinder group and the high-pressure hydrogen storage cylinder group after receiving the secondary pressure relief signal.

[0014] Through this scheme, the first-level pressure relief unit, the second-level pressure relief unit and the pressure relief monitoring unit are used respectively to relieve the pressure of the hydrogen cylinder group under test according to the first-level pressure relief threshold and the normal air pressure range, thereby realizing multi-level step-by-step pressure relief of the hydrogen cylinder group under test, so as to reflect the performance of the hydrogen cylinder group under different pressure relief states, while improving the pressure relief efficiency and reducing energy consumption.

[0015] Optionally, the parameter monitoring module includes a gas temperature detection unit and an ambient temperature detection unit; The gas temperature detection unit is used to detect and record the hydrogen temperature in the hydrogen cylinder group under test during the filling and pressure relief process, and determine the hydrogen temperature variation data set; The environmental temperature detection unit is used to detect and record the environmental temperature inside the environmental box during the filling and pressure relief process, and determine the environmental temperature change data set; The parameter monitoring module is used to construct the environmental parameter set according to the hydrogen temperature variation data set and the environmental temperature variation data set.

[0016] Through this scheme, the gas temperature detection unit and the ambient temperature detection unit are used to detect and collect data on the changes in hydrogen temperature and ambient temperature over time, respectively, so as to construct a hydrogen temperature variation data set and an ambient temperature variation data set, and based on the hydrogen temperature variation data set and the ambient temperature variation data set, an environmental parameter set is constructed, so that the environmental parameter set can reflect the leakage risk of the tested hydrogen cylinder group from the perspective of temperature change, thereby providing a scientific data basis for the assessment of the real-time leakage risk of the tested hydrogen cylinder group.

[0017] Optionally, the parameter monitoring module further includes a pressure change detection unit, a recycled gas detection unit and a cycle counting unit; The pressure change detection unit is used to detect and record the gas pressure change amplitude in the tested hydrogen cylinder group during each filling and depressurization process of the tested hydrogen cylinder group, and determine the gas pressure change data set; The recovered gas detection unit is used to detect the excess hydrogen volume recovered by the low-pressure recovery unit during each filling and depressurization process of the hydrogen cylinder group under test, and determine the excess hydrogen change data set; The cycle counting unit is used to record the total number of cycle tests of the tested hydrogen cylinder group; The parameter monitoring module is used to construct the test parameter set according to the gas pressure change data set, the excess hydrogen change data set and the total number of cycle tests.

[0018] Through this solution, the pressure change detection unit and the recovery gas detection unit are used to monitor the pressure change data in the tested hydrogen cylinder group and the excess hydrogen volume in the low-pressure recovery cylinder respectively, so as to construct a pressure change data set and an excess hydrogen change data set to provide data support for the subsequent analysis of the real-time leakage risk of the tested hydrogen cylinder group, and use a cycle counting unit to record the number of cycle tests, so as to conduct a unified comprehensive analysis of the data of each cycle test of the tested hydrogen cylinder group.

[0019] Optionally, the leakage monitoring module is used to determine the total number of air pressure changes according to the air pressure change data set when analyzing the environmental parameter set and the test parameter set to determine the real-time leakage risk; According to the total number of cycle tests and the total number of air pressure changes, the air pressure change data set and the excess hydrogen change data set are analyzed to determine the pressure change value and the excess hydrogen change value corresponding to each air pressure change inside the tested hydrogen cylinder group during each cycle test; Analyze the hydrogen temperature variation data set to determine the hydrogen temperature in the tested hydrogen cylinder group during each cycle test; Analyze the environmental temperature change data set to determine the ambient temperature inside the environmental box during each cycle test; The real-time leakage risk is determined according to the pressure change value, the excess hydrogen change value, the hydrogen temperature, the ambient temperature and the static parameter set.

[0020] Through this solution, the leakage monitoring module is used to analyze the air pressure change data set, excess hydrogen change data set, hydrogen temperature change data set and ambient temperature change data set respectively, to determine the dynamic pressure change value, excess hydrogen change value, hydrogen temperature and ambient temperature during each cycle test, and based on the above changes, the real-time leakage risk of the tested hydrogen cylinder group is mapped and analyzed to determine the accurate real-time leakage risk, effectively ensuring the real-time nature of the leakage risk assessment.

[0021] Optionally, the static parameter set includes the inner radius of the gas cylinder, the wall thickness of the gas cylinder, the elastic modulus of the gas cylinder and the thermal expansion coefficient of the gas cylinder. When the leakage monitoring module determines the real-time leakage risk according to the pressure change value, the excess hydrogen change value, the hydrogen temperature, the ambient temperature and the static parameter set, it is specifically the following formula: ; in, For the real-time leakage risk, is the total number of cyclic tests, is the total number of air pressure changes, The hydrogen cylinder group under test is located in the first During the test cycle The pressure change value corresponding to the change in atmospheric pressure, is the inner radius of the gas cylinder, is the cylinder wall thickness, The hydrogen cylinder group under test is located in the first During the test cycle The excess hydrogen change value corresponding to the atmospheric pressure change, is the volume influence coefficient, is the elastic modulus of the gas cylinder, is the thermal expansion coefficient of the gas cylinder, The temperature of the hydrogen in the hydrogen cylinder group under test during the current cycle test, It is the ambient temperature inside the environmental box during the current cycle test.

[0022] Through this scheme, mathematical analysis is used to design mathematical formulas based on pressure change values, excess hydrogen change values, hydrogen temperature, ambient temperature and static parameter sets to quantify the real-time leakage risk of the tested hydrogen cylinder group during the cyclic test. Driven by dynamic data, the real-time leakage risk assessment process is made more scientific, accurate and comprehensive, while effectively ensuring the real-time nature of the real-time leakage risk assessment results.

[0023] Optionally, the static parameter set further includes material yield strength and a temperature correction coefficient, and the leakage monitoring module is used to determine a safety risk threshold according to the material yield strength, the temperature correction coefficient and a preset safety factor when controlling the start and stop of the pressurization holding module or the exhaust control module according to the real-time leakage risk; Comparing the real-time leakage risk with the safety risk threshold, and if the real-time leakage risk is greater than or equal to the safety risk threshold, controlling the pressurization maintaining module or the exhaust control module to stop working; The safety risk threshold is determined according to the material yield strength, the temperature correction coefficient and the preset safety factor, specifically the following formula: ; in, is the security risk threshold, is the preset safety factor, is the yield strength of the material, is the temperature correction coefficient.

[0024] Through this scheme, mathematical analysis methods are used to design mathematical formulas to accurately quantify the safety risk threshold of the hydrogen cylinder group under test based on the material yield strength, temperature correction factor and preset safety factor, and obtain evaluation criteria for whether to continue the cyclic test, so as to promptly discover and deal with the cyclic test process in which there is a sudden hydrogen leak. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A schematic diagram of an application scenario provided for an embodiment of the present application; Figure 2A schematic structural diagram of a high-pressure hydrogen storage cylinder hydrogen circulation test system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally means that the associated objects before and after are in an "or" relationship.

[0029] The embodiments of the present application are further described in detail below in conjunction with the drawings in the specification.

[0030] In the process of cyclic testing of hydrogen storage cylinders, the existing technology has a significant lag in leakage monitoring of hydrogen storage cylinders, and is unable to reduce the safety hazards caused by sudden leakage of hydrogen.

[0031] Based on this, the present application provides a high-pressure hydrogen storage cylinder hydrogen cycle test system. Through the parameter monitoring module, a series of static parameters of the tested hydrogen cylinder group are recorded, and the pressurization and maintenance module and the exhaust control module are controlled respectively, and the tested hydrogen cylinder is multi-stage peak-shifted filling and multi-stage step-by-step pressure relief are performed to improve the filling and pressure relief efficiency, and at the same time, the filling and pressure relief characteristics of the hydrogen cylinder group in actual use are simulated, so that the cycle test results are authentic and representative. In the process of filling and pressure relief, the parameter monitoring module 201 is used to continuously collect environmental parameters and test parameters, and the environmental parameter set, test parameter set and static parameter set are dynamically and comprehensively analyzed through the leakage monitoring module, and the test report is provided to the tester to determine the real-time leakage risk of the tested hydrogen cylinder group during the cycle test, significantly reduce the safety risks caused by hydrogen sudden leakage, and effectively solve the problem of lag in leakage risk monitoring.

[0032] Figure 1 A schematic diagram of an application scenario provided by the present application. In the process of cyclic testing of high-pressure hydrogen storage cylinders, the system of the present application is used to monitor the leakage risk of high-pressure hydrogen storage cylinders in real time to avoid safety accidents caused by sudden leakage of hydrogen.

[0033] Specifically, the system of the present application is applied to any server. Before the cyclic test, a series of static parameters of the hydrogen cylinder group under test are recorded through the parameter monitoring module, and the pressurization holding module and the exhaust control module are controlled respectively to perform multi-stage staggered filling and multi-stage step-by-step pressure relief on the hydrogen cylinders under test, so as to improve the filling and pressure relief efficiency. At the same time, the filling and pressure relief characteristics of the hydrogen cylinder group during actual use are simulated to make the cyclic test results authentic and representative. During the filling and pressure relief process, the parameter monitoring module 201 is used to continuously collect environmental parameters and test parameters, and the leakage monitoring module is used to perform dynamic comprehensive analysis of the environmental parameter set, the test parameter set and the static parameter set, and the test report is provided to the tester to determine the real-time leakage risk of the hydrogen cylinder group under test during the cyclic test, significantly reduce the safety risks brought by the sudden leakage of hydrogen, and effectively solve the problem of lag in leakage risk monitoring.

[0034] For specific implementation methods, please refer to the following embodiments.

[0035] Figure 2 This is a schematic diagram of the structure of a high-pressure hydrogen storage cylinder hydrogen circulation test system provided in one embodiment of the present application. Figure 2 As shown, a high-pressure hydrogen storage cylinder hydrogen circulation test system 200 of this embodiment includes: The parameter monitoring module 201 is used to monitor the environmental parameter set inside the environmental box and the test parameter set of the hydrogen cylinder group under test, and record the static parameter set of the hydrogen cylinder group under test. After recording the static parameter set, a pressurization signal is sent; The pressurization and holding module 202 is connected to the parameter monitoring module 201 and is used to perform multi-stage peak-shifting filling on the hydrogen cylinder group under test in the environmental box after receiving the pressurization signal, and maintain the gas pressure in the hydrogen cylinder group under test within a preset holding time, and send a pressure relief signal after the preset holding time has passed; The exhaust control module 203 is connected to the pressurization and maintenance module 202 and the parameter monitoring module 201, and is used to perform multi-stage step-by-step pressure relief on the hydrogen cylinder group under test in the environmental box after receiving the pressure relief signal, and send a detection completion signal after the internal pressure of the hydrogen cylinder group is reduced to within a preset pressure range; The leakage monitoring module 204 is connected to the parameter monitoring module 201, the pressurization and maintenance module 202 and the exhaust control module 203, and is used to receive and analyze the environmental parameter set, the test parameter set and the static parameter set during the filling and depressurization process, determine the real-time leakage risk, and control the start and stop of the pressurization and maintenance module 202 or the exhaust control module 203 according to the real-time leakage risk; The performance analysis module 205 is connected to the parameter monitoring module 201 and the exhaust control module 203, and is used to analyze the test parameter set and the environmental parameter set after receiving the detection completion signal, and determine and output a test report.

[0036] An environmental chamber can be a device used to simulate and control the test environment, providing specific environmental conditions for the object being tested, such as high temperature, high pressure, etc., to ensure test reliability.

[0037] The environmental parameter set may be a number of parameter values ​​corresponding to different environmental conditions in the environmental chamber, such as temperature, air pressure, etc.

[0038] The hydrogen cylinder group to be tested may be a hydrogen cylinder group that needs to be subjected to a cycle test.

[0039] The test parameter set may be a parameter value used to measure the leakage risk of the tested hydrogen cylinder group during the cyclic test.

[0040] The static parameter set may be a series of material parameters of the hydrogen cylinder group under test before the cyclic test, such as the inner radius of the cylinder, the wall thickness of the cylinder, etc.

[0041] The pressurization signal may be signal information for indicating the start of the pressurization phase during the cycle test.

[0042] Specifically, during the hydrogen cycle test of the high-pressure hydrogen storage cylinders, the performance of the tested hydrogen cylinders is directly affected by the environmental conditions, the material parameters of the cylinders themselves and the test conditions. At the same time, the leakage risk of the tested hydrogen cylinder group during the cycle test is also closely related to the environmental conditions, the material parameters of the cylinders themselves and the test conditions. Through the parameter monitoring module 201, during the cycle test, the environmental parameter set, static parameter set and test parameter set reflecting the environmental conditions, the material parameters of the cylinders themselves and the test conditions are monitored and recorded, so as to provide multi-dimensional data support for the performance evaluation and leakage risk evaluation of the tested hydrogen cylinder group.

[0043] Multi-stage staggered filling can be a process of filling the hydrogen cylinder group under test with hydrogen at different pressures for several times.

[0044] The preset holding time may be the test time for which the pressure in the hydrogen cylinder to be tested needs to be maintained after the pressurized filling of the hydrogen cylinder group to be tested is completed. The preset holding time may be set according to actual test needs.

[0045] The pressure relief signal may be signal information for indicating the start of a pressure relief phase during a cycle test.

[0046] Specifically, since the hydrogen storage bottle is in a high-pressure state inside during actual use, in order to test the high-pressure resistance of the hydrogen storage bottle during the hydrogen circulation process, the pressurization and maintenance module 202 is used to perform multi-stage staggered filling between the hydrogen cylinder groups under test. The multi-stage staggered filling method is used to simulate the filling process of an actual hydrogen refueling station, so that the test process fits the actual use status of the hydrogen storage bottle, and the multi-stage staggered filling method can simultaneously test the performance of the hydrogen cylinder group under different pressures, thereby reducing the test cost and energy consumption. After the pressurized filling is completed, the pressure maintenance state inside the hydrogen cylinder group under test is tested within the preset holding time to reflect the stability of the hydrogen cylinder group under test.

[0047] The multi-stage step-by-step pressure relief may be a process of performing several pressure relief operations at different pressures on the hydrogen cylinder group under test.

[0048] The preset pressure range may be a normal pressure range inside the hydrogen cylinder group being tested after the hydrogen in the hydrogen cylinder group being tested is emptied.

[0049] The detection completion signal may be signal information used to indicate that a single cycle test of the currently tested hydrogen cylinder group is completed.

[0050] Specifically, during the actual use of the hydrogen storage bottle, the hydrogen in the hydrogen storage bottle usually needs to undergo a continuous release process. Along with the release of hydrogen, the pressure in the hydrogen storage bottle also shows a multi-stage decreasing trend. The exhaust control module 203 performs multi-stage step-by-step pressure relief on the tested gas cylinder to simulate the hydrogen release process of the hydrogen storage bottle in the actual use scenario, so as to make the test conditions closer to daily operations, which is helpful to evaluate the performance of the hydrogen cylinder under different pressures. At the same time, the multi-stage step-by-step pressure relief method is used to reduce the safety accidents caused by the sudden drop of pressure during the cycle test, which meets the safety requirements for the use of hydrogen storage bottles.

[0051] The real-time leakage risk may be the dynamic hydrogen leakage risk exhibited by the tested hydrogen cylinder group during the cycle test.

[0052] Specifically, in the prior art, during the cycle test of hydrogen storage bottles, the hydrogen concentration is usually continuously monitored by gas detection equipment, such as a gas chromatograph. When the hydrogen concentration exceeds the safety threshold, an audible and visual warning is issued or the test is stopped. Although this method has high accuracy and is sensitive to changes in hydrogen concentration, it can only handle continuous, trace hydrogen leakage that will not quickly cause safety accidents, and cannot significantly reduce the risk of sudden large-scale hydrogen leakage or even explosion. The present solution uses the leakage monitoring module 204 to analyze the environmental parameter set, the test parameter set and the static parameter set in real time during the cycle test, and uses mathematical analysis to determine the real-time leakage risk of the current hydrogen bottle group under the current cycle test environment and conditions, and controls the start and stop of the pressurization holding module or the exhaust control module according to the real-time leakage risk, thereby nipping the hydrogen sudden leakage accident in the bud.

[0053] The test report may be a data report for reflecting the performance of the current hydrogen cylinder group under test in the current cycle test.

[0054] Specifically, through the performance analysis module 205, the test parameter set and environmental parameter set generated by the current hydrogen cylinder group under test during each cycle test are uniformly recorded and integrated, and the integrated parameters are visualized and output through data visualization technology, so that the test personnel can clearly understand the performance of the current hydrogen cylinder group under test under the test conditions corresponding to each cycle test.

[0055] Through this solution, before the cyclic test, a series of static parameters of the hydrogen cylinder group under test are recorded through the parameter monitoring module 201, and the pressurization and holding module 202 and the exhaust control module 203 are controlled respectively to perform multi-stage staggered filling and multi-stage step-by-step pressure relief on the hydrogen cylinders under test, so as to improve the filling and pressure relief efficiency. At the same time, the filling and pressure relief characteristics of the hydrogen cylinder group during actual use are simulated to make the cyclic test results authentic and representative. During the filling and pressure relief process, the parameter monitoring module 201 is used to continuously collect environmental parameters and test parameters, and the leakage monitoring module 204 is used to perform dynamic comprehensive analysis on the environmental parameter set, the test parameter set and the static parameter set, and output a test report to determine the real-time leakage risk of the hydrogen cylinder group under test during the cyclic test, significantly reduce the safety risks brought by the sudden leakage of hydrogen, and effectively solve the problem of lag in leakage risk monitoring.

[0056] In some embodiments, the pressurization maintaining module 202 includes a first-level pressurization unit 20201, a second-level pressurization unit 20202, a third-level pressurization unit 20203, and a pressurization monitoring unit 20204; the pressurization monitoring unit 20204 is respectively connected to the first-level pressurization unit 20201, the second-level pressurization unit 20202 and the third-level pressurization unit 20203; the pressurization monitoring unit 20204 is used to monitor the pressure in the hydrogen cylinder under test during the pressurization process. When the pressure in the hydrogen cylinder group under test reaches the first-level air pressure threshold, the first-level pressurization unit 20201 is controlled to stop filling, and a second-level pressurization signal is sent to the second-level pressurization unit 20202; when the pressure in the hydrogen cylinder group under test reaches the second-level air pressure threshold, the first-level pressurization unit 20201 is controlled to stop filling, and a third-level pressurization signal is sent to the third-level pressurization unit 20203; when the pressure in the hydrogen cylinder group under test reaches the third-level air pressure threshold, the third-level pressurization unit 20203 is controlled to stop filling.

[0057] The first-level gas pressure threshold may be a target value that the pressure in the hydrogen cylinder under test needs to reach during the filling process. The first-level gas pressure threshold in this solution is set to 20 MPa.

[0058] The secondary pressurization signal may be signal information indicating that the pressure in the hydrogen cylinder under test has reached a first-stage target.

[0059] The secondary pressure threshold may be a second-stage target value that the pressure in the hydrogen cylinder being tested needs to reach during the filling process. The secondary pressure threshold in this solution is set to 40 MPa.

[0060] The third-stage pressurization signal may be signal information indicating that the pressure in the hydrogen cylinder under test has reached the second-stage target.

[0061] The third-level pressure threshold may be the final target value that the pressure in the hydrogen cylinder being measured needs to reach during the filling process. The third-level pressure threshold in this solution is set to 87.5 MPa.

[0062] Specifically, the filling process is divided into three filling stages through the first-level pressurizing unit 20201, the second-level pressurizing unit 20202 and the third-level pressurizing unit 20203, and the pressurization monitoring unit 20204 is used to uniformly monitor and regulate different pressurizing units. The pressurization monitoring unit 20204 is equipped with a built-in air pressure sensor and a controller. When the pressurization monitoring unit 20204 uses the air pressure sensor to monitor that the air pressure in the tested hydrogen cylinder group reaches the first-level air pressure threshold or the second-level air pressure threshold, the controller controls the second-level pressurizing unit 20202 or the third-level pressurizing unit 20203 to intervene in the filling process. When the air pressure in the tested hydrogen cylinder group reaches the third-level air pressure threshold, it indicates that the filling is completed. At this time, the pressurization monitoring unit 20204 controls the third-level pressurizing unit 20203 through the controller to stop filling, so as to achieve precise control of the multi-stage staggered filling process.

[0063] Through this solution, the pressurization monitoring unit 20204 is used to dynamically adjust the intervention timing of the first-level pressurization unit 20201, the second-level pressurization unit 20202 and the third-level pressurization unit 20203 in the multi-stage filling process according to the first-level air pressure threshold, the second-level air pressure threshold and the third-level air pressure threshold, so as to improve the accuracy of the multi-stage filling process.

[0064] In some embodiments, the first-level pressurizing unit 20201 is used to control the low-pressure hydrogen storage cylinder group to perform low-pressure filling on the hydrogen cylinder group under test according to the low-pressure filling time and the low-pressure filling pressure; the second-level pressurizing unit 20202 is used to control the medium-pressure hydrogen storage cylinder group to perform medium-pressure filling on the hydrogen cylinder group under test according to the medium-pressure filling time and the medium-pressure filling pressure after receiving the second-level pressurizing signal; the third-level pressurizing unit 20203 is used to control the high-pressure hydrogen storage cylinder group to perform high-pressure filling on the hydrogen cylinder group under test according to the high-pressure filling time and the high-pressure filling pressure after receiving the third-level pressurizing signal.

[0065] The low-pressure hydrogen storage cylinder group can be a hydrogen storage cylinder group used for low-pressure filling of the hydrogen cylinder group under test. In this scheme, the low-pressure hydrogen storage cylinder group is configured to consist of 5 hydrogen storage cylinder groups with a volume of 2m³ and a working pressure of 20Mpa.

[0066] The medium-pressure hydrogen storage cylinder group can be a hydrogen storage cylinder group used for medium-pressure filling of the hydrogen cylinder group under test. In this scheme, the low-pressure hydrogen storage cylinder group is configured to consist of 4 hydrogen storage cylinder groups with a volume of 1m³ and a working pressure of 45Mpa.

[0067] The high-pressure hydrogen storage cylinder group can be a hydrogen storage cylinder group used for high-pressure filling of the hydrogen cylinder group under test. In this scheme, the low-pressure hydrogen storage cylinder group is configured to consist of two hydrogen storage cylinder groups with a volume of 0.6m³ and a working pressure of 140Mpa.

[0068] The low-pressure filling time may be the time requirement for low-pressure filling of the hydrogen cylinder group under test. In this solution, the low-pressure filling time is set to 110s.

[0069] The low-pressure filling pressure may be the pressure requirement for low-pressure filling of the hydrogen cylinder group under test. In this solution, the low-pressure filling pressure is set to 20 MPa.

[0070] The medium-pressure filling time may be the time requirement for medium-pressure filling of the hydrogen cylinder group under test. In this solution, the medium-pressure filling time is set to 87s.

[0071] The medium-pressure filling pressure may be the pressure requirement for medium-pressure filling of the hydrogen cylinder group under test. In this solution, the medium-pressure filling pressure is set to 40 MPa.

[0072] The high-pressure filling time may be the time requirement for high-pressure filling of the hydrogen cylinder group under test. In this solution, the medium-pressure filling time is set to 148s.

[0073] The high-pressure filling pressure may be the pressure requirement for high-pressure filling of the hydrogen cylinder group under test. In this solution, the medium-pressure filling pressure is set to 87.5 MPa.

[0074] Specifically, the hydrogen cylinder group under test is filled through the first-stage pressurizing unit 20201, the second-stage pressurizing unit 20202 and the third-stage pressurizing unit 20203 according to their corresponding filling times and filling pressures, using hydrogen transportation equipment such as a liquid-driven piston machine, so as to achieve staggered filling of the hydrogen cylinder group under test on the basis of multi-stage filling.

[0075] In some other embodiments, the pressure increasing rate during the filling process is regulated by the parallel configuration of two-way regulating valves, so that the pressure increasing rate is adjustable within the range of 0.3~0.625MPa / s, the adjustment time is ≤5s, the allowable error is ±2%, and the maximum flow rate of hydrogen during the filling process is 60g / s. If it exceeds, the pressure increasing rate is lowered. At the same time, the temperature of the gas cylinder is monitored by a temperature sensor. The temperature of the gas cylinder shall not exceed 85°C. If it exceeds, the pressure increasing rate is lowered to improve the safety of the filling process.

[0076] Through this scheme, the first-level pressurizing unit 20201, the second-level pressurizing unit 20202 and the third-level pressurizing unit 20203 are respectively used to fill the hydrogen cylinder group under test according to their corresponding different filling times and filling pressures. On the basis of multi-stage filling, staggered filling of the hydrogen cylinder group under test is achieved to reflect the performance of the hydrogen cylinder group under different filling pressures, while improving the filling efficiency and reducing energy consumption.

[0077] In some embodiments, the pressurization maintaining module 202 also includes a low-pressure recovery unit 20205; the low-pressure recovery unit 20205 is used to control the low-pressure recovery gas cylinder to recover and temporarily store excess hydrogen during the cycle test.

[0078] The low-pressure recovery gas cylinder can be used to store excess hydrogen with a pressure of 1Mpa during the cycle test. In this solution, the low-pressure recovery gas cylinder is set to a hydrogen storage cylinder with a volume of 2m³ and a working pressure of 20Mpa.

[0079] Excess hydrogen may be excess hydrogen leaked due to trace gas loss caused by pressure changes during the cycle test. For safety and resource utilization considerations, it needs to be recovered.

[0080] Specifically, through the low-pressure recovery unit 20205, the pipe valve system is controlled, such as using a sequential control valve box to control the switching of the corresponding valve, so that the excess hydrogen generated during the circulation test is transported to the low-pressure recovery gas cylinder, thereby improving the safety of the circulation test process while reducing the cost waste caused by gas loss. At the same time, the excess hydrogen can also provide an indirect basis for the subsequent assessment of the leakage risk of the hydrogen cylinder being tested.

[0081] Through this scheme, the low-pressure recovery unit 20205 is utilized to recover the excess hydrogen generated due to gas loss during the circulation test through the low-pressure recovery gas cylinder, thereby improving the safety of the circulation test process while reducing the cost waste caused by gas loss, and providing an indirect basis for the subsequent assessment of the leakage risk of the hydrogen cylinder being tested.

[0082] In some embodiments, the exhaust control module includes a first-level pressure relief unit 20301, a second-level pressure relief unit 20302 and a pressure relief monitoring unit 20303; the pressure relief monitoring unit 20303 is used to monitor the pressure in the hydrogen cylinder under test during the pressure relief process. When the pressure in the hydrogen cylinder under test drops to the first-level pressure relief threshold, the first-level pressure relief unit 20301 is controlled to stop pressure relief, and a second-level pressure relief signal is sent to the second-level pressure relief unit 20302. When the pressure in the hydrogen cylinder under test drops to within the normal pressure range, the second-level pressure relief unit 20302 is controlled to stop pressure relief; the first-level pressure relief unit 20301 is used to transmit the high-pressure gas in the hydrogen cylinder under test to the medium-pressure hydrogen storage cylinder group and the high-pressure hydrogen storage cylinder group; the second-level pressure relief unit 20302 is used to transmit the low-pressure gas in the hydrogen cylinder under test to the low-pressure hydrogen storage cylinder group, the medium-pressure hydrogen storage cylinder group and the high-pressure hydrogen storage cylinder group after receiving the second-level pressure relief signal.

[0083] The first-level pressure relief threshold may be a target value that the pressure in the hydrogen cylinder under test needs to reach during the pressure relief process. The first-level pressure relief threshold in this solution is set to 25 MPa.

[0084] The secondary pressure relief signal may be a signal information used to indicate that the pressure in the hydrogen cylinder under test has reached a target value for a stage.

[0085] The normal air pressure range may be the air pressure range after the hydrogen in the hydrogen storage bottle is emptied, which is usually between 1 and 3 MPa.

[0086] Specifically, after filling is completed, the pressure in the tested gas cylinder group reaches the third-level gas pressure threshold, which is 87.5Mpa. In the pressure relief stage, the high-pressure gas in the tested gas cylinder group is first transported to the medium-pressure gas storage cylinder group and the high-pressure gas storage cylinder group through hydrogen transportation equipment, such as a liquid-driven piston machine, to reduce the pressure in the tested gas cylinder group to 25Mpa. Then, the remaining hydrogen in the tested gas cylinder group is evenly transported to the low-pressure hydrogen storage cylinder, the medium-pressure hydrogen storage cylinder and the high-pressure hydrogen storage cylinder through the hydrogen transportation equipment, thereby completing the multi-stage step-by-step pressure relief of the hydrogen in the tested gas cylinder.

[0087] In some other embodiments, the pressure relief flow rate during the pressure relief process is controlled by configuring a dual-way regulating valve in parallel, so that the pressure relief flow rate is adjustable within the range of 1~10g / s, the adjustment time is ≤5s, and the allowable error is ±2%, so as to simulate different hydrogen release states of the tested gas cylinder group during actual use.

[0088] Through this scheme, the first-level pressure relief unit 20301, the second-level pressure relief unit 20302 and the pressure relief monitoring unit 20303 are respectively used to relieve the pressure of the hydrogen cylinder group under test according to the first-level pressure relief threshold and the normal air pressure range, thereby realizing multi-level step-by-step pressure relief of the hydrogen cylinder group under test, so as to reflect the performance of the hydrogen cylinder group under different pressure relief states, while improving the pressure relief efficiency and reducing energy consumption.

[0089] In some embodiments, the parameter monitoring module 201 includes a gas temperature detection unit 20101 and an ambient temperature detection unit 20101; the gas temperature detection unit 20101 is used to detect and record the hydrogen temperature in the hydrogen cylinder group under test during the filling and pressure relief process, and determine the hydrogen temperature variation data set; the ambient temperature detection unit 20101 is used to detect and record the ambient temperature inside the environmental box during the filling and pressure relief process, and determine the ambient temperature variation data set; the parameter monitoring module 201 is used to construct an environmental parameter set based on the hydrogen temperature variation data set and the ambient temperature variation data set.

[0090] The hydrogen temperature variation data set may be a data set of the change of the hydrogen temperature in the tested hydrogen cylinder group over time during the cycle test.

[0091] The environmental temperature variation data set may be a data set of the temperature variation over time in the environmental chamber during a cycle test.

[0092] Specifically, changes in hydrogen temperature and external ambient temperature have a direct impact on the risk of leakage of hydrogen storage cylinders. Specifically, a significant increase in external temperature will cause the gas volume to expand, resulting in excessive gas pressure inside the hydrogen storage cylinder, which increases the risk of leakage. A significant decrease in external temperature will cause the hydrogen storage cylinder body to shrink and form tiny cracks, which will also increase the risk of leakage. Fluctuations in hydrogen temperature will cause fluctuations in the internal pressure of the hydrogen storage cylinder. Pressure fluctuations may cause instability in the state of the bottle material, thereby increasing the risk of leakage. Therefore, the gas temperature detection unit 20101 and the ambient temperature detection unit 20101 are used to control temperature sensors for detecting hydrogen temperature and ambient temperature, respectively, to detect the hydrogen temperature and ambient temperature in real time, and to collect corresponding data on changes in hydrogen temperature and ambient temperature over time during the test process, thereby constructing a hydrogen temperature variation data set and an ambient temperature variation data set, so that the environmental parameter set can provide a scientific data basis for the subsequent assessment of the real-time leakage risk of the hydrogen cylinder group under test.

[0093] Through this solution, the gas temperature detection unit 20101 and the ambient temperature detection unit 20101 are used to detect and collect data on the changes in hydrogen temperature and ambient temperature over time, respectively, so as to construct a hydrogen temperature variation data set and an ambient temperature variation data set, and based on the hydrogen temperature variation data set and the ambient temperature variation data set, an environmental parameter set is constructed, so that the environmental parameter set can reflect the leakage risk of the tested hydrogen cylinder group from the perspective of temperature change, thereby providing a scientific data basis for the assessment of the real-time leakage risk of the tested hydrogen cylinder group.

[0094] In some embodiments, the parameter monitoring module 201 also includes a pressure change detection unit 20103, a recovery gas detection unit 20104 and a cycle counting unit 20105; the pressure change detection unit 20103 is used to detect and record the amplitude of the gas pressure change in the tested hydrogen cylinder group during each filling and depressurization process of the tested hydrogen cylinder group, and determine the pressure change data set; the recovery gas detection unit 20104 is used to detect the excess hydrogen volume recovered by the low-pressure recovery unit during each filling and depressurization process of the tested hydrogen cylinder group, and determine the excess hydrogen change data set; the cycle counting unit 20105 is used to record the total number of cycle tests of the tested hydrogen cylinder group; the parameter monitoring module 201 is used to construct a test parameter set based on the pressure change data set, the excess hydrogen change data set and the total number of cycle tests.

[0095] The gas pressure change data set may be a data set reflecting the actual gas pressure change in the hydrogen cylinder under the influence of multi-stage staggered filling and multi-stage step-by-step pressure relief during the cyclic test.

[0096] The excess hydrogen change data set may be a data set reflecting the change in volume of the recovered excess hydrogen.

[0097] The total number of cycle tests may be the total number of cycle tests that have been currently performed on the hydrogen cylinder group being tested.

[0098] Specifically, in the process of performing multi-stage staggered filling and multi-stage step-by-step pressure relief on the hydrogen cylinder group under test through the scheme in the aforementioned embodiment, the gas pressure in the hydrogen cylinder group under test will fluctuate frequently, especially when different pressurizing units and pressure relief units are switched. The greater the amplitude of these pressure fluctuations, the greater the amplitude of stress change on the hydrogen cylinder group under test. Correspondingly, the greater the leakage risk of the hydrogen cylinder group under test. The pressure change detection unit 20103 controls the pressure sensor used to detect the gas pressure in the hydrogen cylinder under test, collects the gas pressure change amplitude at different times, and then constructs a pressure change data set. At the same time, the change in the volume of excess hydrogen reflects the change in the amount of excess hydrogen collected during the cyclic test. When the excess hydrogen When the volume is maintained within the normal range, it means that the current excess hydrogen is caused by normal gas loss. When the excess hydrogen volume is too large, it means that in addition to normal gas loss, there is a high possibility of leakage. Therefore, the larger the excess hydrogen volume, the greater the risk of leakage. The pressure sensor used to detect the gas pressure in the low-pressure recovery gas cylinder is controlled by the recovery gas detection unit 20104, and the pressure data in the low-pressure recovery gas cylinder is collected. Then, the volume of hydrogen in the low-pressure recovery gas cylinder is calculated through the ideal gas state equation. The number of cycle tests is counted by the circulation technology unit to control the electronic counter to obtain the total number of cycle tests, so as to conduct a unified comprehensive analysis of the data of each cycle test of the hydrogen cylinder group under test.

[0099] Through this solution, the pressure change detection unit 20103 and the recovery gas detection unit 20104 are used to monitor the pressure change data in the tested hydrogen cylinder group and the excess hydrogen volume in the low-pressure recovery cylinder respectively, so as to construct a pressure change data set and an excess hydrogen change data set to provide data support for the subsequent analysis of the real-time leakage risk of the tested hydrogen cylinder group, and the cycle counting unit 20105 is used to record the number of cycle tests, so as to conduct a unified comprehensive analysis of the data of each cycle test of the tested hydrogen cylinder group.

[0100] In some embodiments, when analyzing the environmental parameter set and the test parameter set to determine the real-time leakage risk, the leakage monitoring module 204 is used to determine the total number of air pressure changes based on the air pressure change data set; analyze the air pressure change data set and the excess hydrogen change data set based on the total number of cycle tests and the total number of air pressure changes to determine the pressure change value and excess hydrogen change value corresponding to each air pressure change inside the tested hydrogen cylinder group during each cycle test; analyze the hydrogen temperature change data set to determine the hydrogen temperature inside the tested hydrogen cylinder group during each cycle test; analyze the environmental temperature change data set to determine the ambient temperature inside the environmental box during each cycle test; determine the real-time leakage risk based on the pressure change value, excess hydrogen change value, hydrogen temperature, ambient temperature and static parameter set.

[0101] The total number of gas pressure changes can be the number of times significant gas pressure changes occur inside the tested gas cylinder group during a single cycle test.

[0102] The pressure change value may be the corresponding pressure change value each time a significant pressure change occurs inside the tested hydrogen cylinder group.

[0103] The excess hydrogen change value may be the hydrogen volume change value in the corresponding low-pressure recovery gas cylinder each time a significant pressure change occurs inside the hydrogen cylinder group being tested.

[0104] Specifically, the assessment of the real-time leakage risk of the hydrogen cylinder group under test should be based on the analysis of dynamic data. The real-time leakage risk of the hydrogen cylinder group under test during the cycle test should be mapped through the changing trends of different data in each cycle test process. Through the steps in this plan, the corresponding pressure change values, excess change values, hydrogen temperature and ambient temperature under different cycle tests can be obtained, which will provide the necessary data basis for the subsequent use of mathematical analysis methods and the comprehensive use of the above parameters to scientifically quantify the real-time leakage risk.

[0105] Through this solution, the leakage monitoring module 204 is used to analyze the air pressure change data set, the excess hydrogen change data set, the hydrogen temperature change data set and the ambient temperature change data set respectively, to determine the pressure change value, excess hydrogen change value, hydrogen temperature and ambient temperature that change dynamically during each cycle test, and based on the above changes, the real-time leakage risk of the tested hydrogen cylinder group is mapped and analyzed to determine the accurate real-time leakage risk, thereby effectively ensuring the real-time nature of the leakage risk assessment.

[0106] In some embodiments, the leakage monitoring module 204 determines the real-time leakage risk according to the pressure change value, the excess hydrogen change value, the hydrogen temperature, the ambient temperature and the static parameter set, specifically the following formula (1): (1) in, For real-time leakage risk, is the total number of cycle tests, is the total number of air pressure changes, The hydrogen cylinder group under test is in the first During the test cycle The corresponding pressure change value when the atmospheric pressure changes, is the inner radius of the cylinder, is the cylinder wall thickness, The hydrogen cylinder group under test is in the first During the test cycle The corresponding excess hydrogen change value when the atmospheric pressure changes, is the volume influence coefficient, is the elastic modulus of the gas cylinder, is the thermal expansion coefficient of the gas cylinder, The hydrogen temperature in the hydrogen cylinder group being tested during the current cycle test, It is the ambient temperature inside the environmental chamber during the current cycle test.

[0107] The static parameter set includes the cylinder inner radius, cylinder wall thickness, cylinder elastic modulus, and cylinder thermal expansion coefficient.

[0108] The inner radius of the gas cylinder may be the radius of the inner cavity of the hydrogen gas cylinder being measured.

[0109] The cylinder wall thickness may be the cylinder wall thickness of the hydrogen cylinder being tested.

[0110] The elastic modulus of the gas cylinder can be the resistance of the tested hydrogen cylinder to deformation when it is subjected to stress.

[0111] The thermal expansion coefficient of the gas cylinder can be a physical quantity used to describe the degree of change in the volume of the internal cavity of the hydrogen cylinder under test when it is affected by temperature changes.

[0112] The volume influence coefficient may be a mathematical quantitative value that describes the degree of influence of the excess hydrogen volume on the leakage risk. The volume influence coefficient may be obtained by fitting the experimental data.

[0113] Specifically, through formula (1) and The dynamic change data corresponding to each air pressure change in each cycle test is traversed, through , using the gas state equation and mechanical principles to describe the stress effect of the internal pressure change of the hydrogen cylinder on the wall of the hydrogen cylinder. Describe the impact of each excess hydrogen volume change on the leakage risk and Describe the impact of the temperature difference between the inside and outside of the tested gas cylinder group on the gas cylinder material, and comprehensively consider the above different impacts to scientifically and accurately quantify the real-time leakage risk of the tested hydrogen cylinder group.

[0114] Through this scheme, mathematical analysis is used to design mathematical formulas based on pressure change values, excess hydrogen change values, hydrogen temperature, ambient temperature and static parameter sets to quantify the real-time leakage risk of the tested hydrogen cylinder group during the cyclic test. Driven by dynamic data, the real-time leakage risk assessment process is made more scientific, accurate and comprehensive, while effectively ensuring the real-time nature of the real-time leakage risk assessment results.

[0115] In some embodiments, when the leakage monitoring module 204 controls the start and stop of the pressurization and maintenance module 202 or the exhaust control module 203 according to the real-time leakage risk, it is used to determine the safety risk threshold according to the material yield strength, the temperature correction coefficient and the preset safety factor; compare the real-time leakage risk with the safety risk threshold, and if the real-time leakage risk is greater than or equal to the safety risk threshold, control the pressurization and maintenance module 202 or the exhaust control module 203 to stop working; determine the safety risk threshold according to the material yield strength, the temperature correction coefficient and the preset safety factor, which is specifically the following formula (2): (2) in, is the security risk threshold, is the preset safety factor, is the material yield strength, is the temperature correction factor.

[0116] The static parameter set also includes material yield strength and temperature correction factors.

[0117] The material yield strength can be the lowest stress level at which the material of the hydrogen cylinder under test begins to undergo permanent yielding when subjected to external loads.

[0118] The temperature correction coefficient may be a mathematically quantified value that describes the relationship between the leakage risk of the hydrogen cylinder being tested and the temperature within a certain temperature range.

[0119] The safety risk threshold may be the minimum risk threshold at which a sudden hydrogen leak may occur in the hydrogen cylinder being tested.

[0120] The preset safety factor may be a mathematically quantified value that describes the degree of influence of the material yield strength and the temperature calibration factor on the safety risk threshold.

[0121] Specifically, after obtaining the real-time leakage risk of the hydrogen cylinder group under test, it is necessary to further evaluate whether to continue the cycle test based on the real-time leakage risk. Based on the material properties and temperature influence of the hydrogen cylinder under test, the safety risk threshold is quantified according to the material yield strength, temperature correction coefficient and preset safety factor through formula (2). The real-time leakage risk is compared with the safety risk threshold. If the real-time leakage risk is greater than or equal to the safety risk threshold, it means that the hydrogen cylinder group under test may have a sudden hydrogen leakage. In order to avoid a safety accident caused by a sudden hydrogen leakage, the leakage monitoring module 204 is used to control the pressurization holding module 202 or the exhaust control module 203 to stop working.

[0122] Through this scheme, mathematical analysis methods are used to design mathematical formulas to accurately quantify the safety risk threshold of the hydrogen cylinder group under test based on the material yield strength, temperature correction factor and preset safety factor, and obtain evaluation criteria for whether to continue the cyclic test, so as to promptly discover and deal with the cyclic test process in which there is a sudden hydrogen leak.

Claims

1. A high-pressure hydrogen storage cylinder hydrogen circulation test system, characterized in that: include: The parameter monitoring module is used to monitor the environmental parameter set inside the environmental box and the test parameter set of the hydrogen cylinder group under test, and record the static parameter set of the hydrogen cylinder group under test, and send a pressurization signal after recording the static parameter set; A pressurization and maintenance module, which is connected to the parameter monitoring module, and is used to perform multi-stage peak-shifting filling on the hydrogen cylinder group under test in the environmental box after receiving the pressurization signal, and maintain the gas pressure in the hydrogen cylinder group under test within a preset holding time, and send a pressure relief signal after the preset holding time has passed; an exhaust control module, which is connected to the pressurization and maintenance module and the parameter monitoring module, and is used to perform multi-stage step-by-step pressure relief on the hydrogen cylinder group under test in the environmental box after receiving the pressure relief signal, and send a detection completion signal after the internal pressure of the hydrogen cylinder group is reduced to within a preset pressure range; A leakage monitoring module, which is connected to the parameter monitoring module, the pressurization and maintenance module and the exhaust control module, and is used to receive and analyze the environmental parameter set, the test parameter set and the static parameter set during the filling and depressurization process, determine the real-time leakage risk, and control the start and stop of the pressurization and maintenance module or the exhaust control module according to the real-time leakage risk; The performance analysis module is connected to the parameter monitoring module and the exhaust control module, and is used to analyze the test parameter set and the environmental parameter set after receiving the detection completion signal, and determine and output a test report.

2. The high-pressure hydrogen storage cylinder hydrogen circulation test system according to claim 1 is characterized in that: The pressurization and maintenance module includes a primary pressurization unit, a secondary pressurization unit, a tertiary pressurization unit, and a pressurization monitoring unit; the pressurization monitoring unit is connected to the primary pressurization unit, the secondary pressurization unit, and the tertiary pressurization unit respectively; The pressurization monitoring unit is used to monitor the pressure in the hydrogen cylinder under test during the pressurization process. When the pressure in the hydrogen cylinder group under test reaches the first-level pressure threshold, the first-level pressurization unit is controlled to stop filling and a second-level pressurization signal is sent to the second-level pressurization unit. When the pressure in the tested hydrogen cylinder group reaches the second-level pressure threshold, the first-level pressurizing unit is controlled to stop filling, and a third-level pressurizing signal is sent to the third-level pressurizing unit; When the pressure in the tested hydrogen cylinder group reaches the third-level pressure threshold, the third-level pressurizing unit is controlled to stop filling.

3. The high-pressure hydrogen storage cylinder hydrogen circulation test system according to claim 2 is characterized in that: The first-level pressurizing unit is used to control the low-pressure hydrogen storage cylinder group to perform low-pressure filling on the tested hydrogen cylinder group according to the low-pressure filling time and the low-pressure filling pressure; The secondary pressurizing unit is used to control the medium-pressure hydrogen storage cylinder group to perform medium-pressure filling on the hydrogen cylinder group under test according to the medium-pressure filling time and the medium-pressure filling pressure after receiving the secondary pressurizing signal; The three-stage pressurizing unit is used to control the high-pressure hydrogen storage cylinder group to perform high-pressure filling on the tested hydrogen cylinder group according to the high-pressure filling time and the high-pressure filling pressure after receiving the three-stage pressurizing signal.

4. The high-pressure hydrogen storage cylinder hydrogen circulation test system according to claim 2 is characterized in that: The pressurization and maintenance module also includes a low-pressure recovery unit; The low-pressure recovery unit is used to control the low-pressure recovery gas cylinder to recover and temporarily store excess hydrogen during the cycle test process.

5. The high-pressure hydrogen storage cylinder hydrogen circulation test system according to claim 3 is characterized in that: The exhaust control module includes a primary pressure relief unit, a secondary pressure relief unit and a pressure relief monitoring unit; The pressure relief monitoring unit is used to monitor the pressure in the tested hydrogen cylinder during the pressure relief process. When the pressure in the tested hydrogen cylinder drops to the first-level pressure relief threshold, the first-level pressure relief unit is controlled to stop pressure relief, and the second-level pressure relief signal is sent to the second-level pressure relief unit. When the pressure in the tested hydrogen cylinder drops to the normal pressure range, the second-level pressure relief unit is controlled to stop pressure relief. The first-level pressure relief unit is used to transmit the high-pressure gas in the tested hydrogen cylinder to the medium-pressure hydrogen storage cylinder group and the high-pressure hydrogen storage cylinder group; The secondary pressure relief unit is used to transmit the low-pressure gas in the tested hydrogen cylinder to the low-pressure hydrogen storage cylinder group, the medium-pressure hydrogen storage cylinder group and the high-pressure hydrogen storage cylinder group after receiving the secondary pressure relief signal.

6. The high-pressure hydrogen storage cylinder hydrogen circulation test system according to claim 4 is characterized in that: The parameter monitoring module includes a gas temperature detection unit and an ambient temperature detection unit; The gas temperature detection unit is used to detect and record the hydrogen temperature in the hydrogen cylinder group under test during the filling and pressure relief process, and determine the hydrogen temperature variation data set; The environmental temperature detection unit is used to detect and record the environmental temperature inside the environmental box during the filling and pressure relief process, and determine the environmental temperature change data set; The parameter monitoring module is used to construct the environmental parameter set according to the hydrogen temperature variation data set and the environmental temperature variation data set.

7. The high-pressure hydrogen storage cylinder hydrogen circulation test system according to claim 6 is characterized in that: The parameter monitoring module also includes a pressure change detection unit, a recycled gas detection unit and a cycle counting unit; The pressure change detection unit is used to detect and record the gas pressure change amplitude in the tested hydrogen cylinder group during each filling and depressurization process of the tested hydrogen cylinder group, and determine the gas pressure change data set; The recovered gas detection unit is used to detect the excess hydrogen volume recovered by the low-pressure recovery unit during each filling and depressurization process of the hydrogen cylinder group under test, and determine the excess hydrogen change data set; The cycle counting unit is used to record the total number of cycle tests of the tested hydrogen cylinder group; The parameter monitoring module is used to construct the test parameter set according to the gas pressure change data set, the excess hydrogen change data set and the total number of cycle tests.

8. The high-pressure hydrogen storage cylinder hydrogen circulation test system according to claim 7 is characterized in that: The leakage monitoring module is used to determine the total number of air pressure changes according to the air pressure change data set when analyzing the environmental parameter set and the test parameter set to determine the real-time leakage risk; According to the total number of cycle tests and the total number of air pressure changes, the air pressure change data set and the excess hydrogen change data set are analyzed to determine the pressure change value and the excess hydrogen change value corresponding to each air pressure change inside the tested hydrogen cylinder group during each cycle test; Analyze the hydrogen temperature variation data set to determine the hydrogen temperature in the tested hydrogen cylinder group during each cycle test; Analyze the environmental temperature change data set to determine the ambient temperature inside the environmental box during each cycle test; The real-time leakage risk is determined according to the pressure change value, the excess hydrogen change value, the hydrogen temperature, the ambient temperature and the static parameter set.

9. The high-pressure hydrogen storage cylinder hydrogen circulation test system according to claim 8, characterized in that: The static parameter set includes the inner radius of the gas cylinder, the wall thickness of the gas cylinder, the elastic modulus of the gas cylinder and the thermal expansion coefficient of the gas cylinder. When the leakage monitoring module determines the real-time leakage risk according to the pressure change value, the excess hydrogen change value, the hydrogen temperature, the ambient temperature and the static parameter set, it is specifically the following formula: ； in, For the real-time leakage risk, is the total number of cyclic tests, is the total number of air pressure changes, The hydrogen cylinder group under test is located in the first During the test cycle The pressure change value corresponding to the change in atmospheric pressure, is the inner radius of the gas cylinder, is the cylinder wall thickness, The hydrogen cylinder group under test is located in the first During the test cycle The excess hydrogen change value corresponding to the atmospheric pressure change, is the volume influence coefficient, is the elastic modulus of the gas cylinder, is the thermal expansion coefficient of the gas cylinder, The temperature of the hydrogen in the hydrogen cylinder group under test during the current cycle test, It is the ambient temperature inside the environmental box during the current cycle test.

10. The high-pressure hydrogen storage cylinder hydrogen circulation test system according to claim 9, characterized in that: The static parameter set also includes material yield strength and temperature correction coefficient. When the leakage monitoring module controls the start and stop of the pressurization holding module or the exhaust control module according to the real-time leakage risk, the leakage monitoring module is used to determine the safety risk threshold according to the material yield strength, the temperature correction coefficient and the preset safety factor; Comparing the real-time leakage risk with the safety risk threshold, and if the real-time leakage risk is greater than or equal to the safety risk threshold, controlling the pressurization maintaining module or the exhaust control module to stop working; The safety risk threshold is determined according to the material yield strength, the temperature correction coefficient and the preset safety factor, specifically the following formula: ； in, is the security risk threshold, is the preset safety factor, is the yield strength of the material, is the temperature correction coefficient.

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