Method for testing fire resistance of filament-wound hydrogen cylinders, testing system and related equipment

Abstract

The embodiment of the application provides a kind of fiber winding hydrogen cylinder fire resistance test method, test system and related equipment, belong to hydrogen storage cylinder technical field.The method comprises: by fire source to target cylinder is burnt, obtains the temperature data of target cylinder preset position, and the pressure data of hydrogen pressure, preset position at least includes composite material layer;During the process of burning, in response to the continuous decline of pressure data and the characteristic flame of target cylinder leakage is monitored, determine that target cylinder leaks, and the morphological data of characteristic flame is monitored and recorded;Wait for the pressure data of target cylinder to reduce to preset pressure value, determine that burning test ends, obtain corresponding burning time;After target cylinder of burning test ends, integrity evaluation is carried out, and according to the evaluation result, burning time, morphological data, temperature data and pressure data determine fire resistance performance.The embodiment of the application aims to improve the accuracy of the evaluation of the fire resistance of carbon fiber wound hydrogen storage cylinder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen storage cylinders, in particular to a fiber-wound hydrogen cylinder fire resistance testing method, a testing system and related equipment. BACKGROUND

[0002] In related technologies, carbon fiber full-winding composite high-pressure hydrogen cylinders have the advantages of high mass hydrogen storage density, fast hydrogen charging and discharging speed, and low cost, and are currently widely used as hydrogen storage devices for hydrogen fuel cell vehicles. However, such cylinders also have safety hazards. Since the carbon fiber / epoxy resin-based composite material layer is flammable, when an accident causes the vehicle to catch fire, the cylinder will also burn, and the heat will continuously pass through the composite material layer to the plastic liner, causing the mechanical properties to degrade and leading to leakage failure, and even explosion failure. Therefore, the fire resistance of the cylinder is an important indicator for evaluating its safety in use.

[0003] Currently, the evaluation method for the fire resistance of the cylinder is still the evaluation method for traditional design cylinders, and it is difficult to accurately evaluate the fire resistance of hydrogen cylinders made of carbon fiber full-winding composite materials, and the evaluation accuracy is poor.

[0004] In summary, the technical problems in related technologies need to be improved. SUMMARY

[0005] The main purpose of the embodiments of the present application is to provide a fiber-wound hydrogen cylinder fire resistance testing method, a testing system and related equipment, which aims to improve the accuracy of evaluating the fire resistance of carbon fiber-wound hydrogen storage cylinders.

[0006] To achieve the above-mentioned purpose, one aspect of the embodiments of the present application provides a fiber-wound hydrogen cylinder fire resistance testing method, which comprises:

[0007] Performing a fire test on the target cylinder by a fire source, obtaining temperature data of a preset position of the target cylinder and pressure data of the hydrogen pressure in the cylinder, and the preset position at least includes a composite material layer;

[0008] During the fire process, when the pressure data continuously decreases and the characteristic flame generated by the leakage of the target cylinder is monitored, it is determined that the target cylinder has leaked, and the shape data of the characteristic flame is monitored and recorded;

[0009] Waiting for the pressure data of the target cylinder to decrease to a preset pressure value, determining that the fire test is completed, and obtaining the corresponding fire time;

[0010] Performing an integrity evaluation on the target cylinder after the fire test is completed, and determining the fire resistance of the target cylinder according to the evaluation result of the integrity evaluation, the fire time, the shape data, the temperature data and the pressure data.

[0011] In some embodiments, the temperature data comprises a first temperature at a valve of the target cylinder, and a second temperature at a half-thickness of a composite layer, the valve being provided with an automatic pressure relief device, the fire-burning process further comprising:

[0012] in response to the first temperature reaching a first relief temperature, triggering the automatic pressure relief device to relieve the in-cylinder gas of the target cylinder through the automatic pressure relief device;

[0013] in response to the second temperature reaching a second relief temperature, and the automatic pressure relief device being in a non-triggered state, triggering a backup relief device at a cylinder tail to relieve the in-cylinder gas through the backup relief device.

[0014] In some embodiments, the monitoring records the shape data of the characteristic flame, comprising:

[0015] acquiring a characteristic image of the characteristic flame;

[0016] extracting a length parameter and a width parameter of the characteristic flame according to the characteristic image, the shape data comprising the length parameter and the width parameter.

[0017] In some embodiments, the integrity evaluation of the target cylinder after the fire-burning test comprises:

[0018] in response to the target cylinder leaking during the fire-burning test, scanning a composite layer of the target cylinder by ultrasonic tomography to obtain damage data, the evaluation result comprising the damage data;

[0019] in response to the target cylinder not leaking during the fire-burning test, performing a water pressure burst test on the target cylinder to obtain a residual burst pressure and a failure position, the evaluation result comprising the residual burst pressure and the failure position.

[0020] In some embodiments, the temperature data comprises a second temperature at a half-thickness of a composite layer, a third temperature at an outer surface of a liner, and a fourth temperature at an outer surface of a target cylinder, the shape data comprises a length parameter and a width parameter of the characteristic flame, and the determination of the fire-resistant performance of the target cylinder according to the evaluation result of the integrity evaluation, the fire-burning time, the shape data, the temperature data, and the pressure data comprises:

[0021] determining a first temperature curve, a second temperature curve and a third temperature curve according to the changes of the second temperature, the third temperature and the fourth temperature over time, and determining a temperature change rule and a temperature conduction hysteresis according to the first temperature curve, the second temperature curve and the third temperature curve;

[0022] determining a pressure temperature correlation curve according to the correlation of the pressure data with each of the temperature data at different time points, and calculating a pressure ratio of the pressure data to initial pressure data in the fire burning process, and determining a pressure change rule according to the pressure temperature correlation curve and the pressure ratio;

[0023] determining a mapped leakage level according to the length parameter and the width parameter;

[0024] determining the fire resistance performance of the target gas cylinder through the evaluation result, the fire burning time, the temperature change rule, the temperature conduction hysteresis, the pressure change rule and the leakage level.

[0025] To achieve the above-mentioned purpose, another aspect of the embodiment of the present application proposes a fiber-wound hydrogen cylinder fire resistance performance testing system, which is used to apply the above-mentioned method, and the system comprises:

[0026] a temperature detection module configured to collect temperature data of a target gas cylinder at a preset position, wherein the preset position at least includes a composite material layer;

[0027] a pressure detection module configured to collect pressure data of hydrogen pressure in the target gas cylinder;

[0028] an ignition module configured to generate a fire source to perform a fire burning test on the target gas cylinder;

[0029] a flame monitoring module configured to monitor a characteristic flame generated by a leakage gas of the target gas cylinder;

[0030] a test control module configured to determine whether the target gas cylinder leaks according to the pressure data and the characteristic flame, determine whether the fire burning test is completed according to the pressure data, and determine a fire burning time;

[0031] a data analysis module configured to extract shape data according to the characteristic flame, perform an integrity evaluation on the target gas cylinder after the fire burning test, and determine the fire resistance performance of the target gas cylinder according to an evaluation result of the integrity evaluation, the fire burning time, the shape data, the temperature data and the pressure data.

[0032] In some embodiments, the temperature detection module includes a temperature sensor, a fiber grating temperature sensor, and a thermocouple, the temperature sensor is arranged at the target cylinder valve and the cylinder tail, the fiber grating temperature sensor is arranged at the half thickness of the composite material layer and the outer surface of the liner, and the thermocouple is arranged at the outer surface of the target cylinder and the valve, and the preset positions include the valve, the cylinder tail, the half thickness of the composite material layer, the outer surface of the liner, and the outer surface of the cylinder.

[0033] In some embodiments, the flame monitoring module includes an infrared gas imager and a high-speed camera, the infrared gas imager is used to capture the characteristic flame, and the high-speed camera is used to capture the dynamic image of the characteristic flame.

[0034] To achieve the above object, another aspect of the embodiments of the present application provides a computer device, which comprises a memory and a processor, the memory stores a computer program, and the processor implements the above method when executing the computer program.

[0035] To achieve the above object, another aspect of the embodiments of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the above method.

[0036] The embodiments of the present application at least have the following beneficial effects: the present application provides a fiber-wound hydrogen cylinder fire resistance test method, a test system and related equipment, the scheme performs a fire test on the target cylinder through a fire source, obtains temperature data of the target cylinder at preset positions, the preset positions at least include a composite material layer, in the fire process, whether the target cylinder leaks is judged according to whether the pressure data continuously decreases and whether a characteristic flame caused by leakage is monitored, and the shape data of the characteristic flame is recorded, so as to analyze the leakage through the characteristic flame, then the pressure data is reduced to a preset pressure value, which represents that the gas in the cylinder is basically discharged, the fire test is determined to be completed, the corresponding fire time is obtained, and then the integrity of the cylinder in the fire test can be evaluated, and the fire resistance of the target cylinder is determined by combining the evaluation result, the fire time measured in the test, the shape data of the characteristic flame, the temperature data and the pressure data. Compared with the traditional cylinder fire resistance test method, the present application is aimed at the structure of the carbon fiber-wound hydrogen storage cylinder, the temperature of the composite material layer is monitored in the fire test, the analysis of the flame shape is combined, and the integrity evaluation for the composite structure cylinder is designed, so as to comprehensively judge the fire resistance, and improve the accuracy of the fire resistance evaluation of the carbon fiber-wound hydrogen storage cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1is a flow chart of a fiber-wound hydrogen cylinder fire resistance testing method provided by an embodiment of the present application.

[0038] Figure 2 is Figure 1 is a partial flow chart of step S102 in

[0039] Figure 3 is Figure 1 is a partial flow chart of step S104 in

[0040] Figure 4 is a module relationship schematic diagram of a fiber-wound hydrogen cylinder fire resistance testing system provided by an embodiment of the present application.

[0041] Figure 5 is a structure schematic diagram of a fiber-wound hydrogen cylinder fire resistance testing system provided by an embodiment of the present application.

[0042] Figure 6 is a distribution schematic diagram of a temperature detection module provided by an embodiment of the present application.

[0043] Figure 7 is a hardware structure schematic diagram of a computer device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. When the following description refers to the accompanying drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementation described in the following exemplary embodiments does not represent all the implementations consistent with the embodiments of the present application, but is only an example of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0045] It can be understood that the terms "first", "second", and the like used in the present application can be used herein to describe various concepts, but unless specifically stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of the present application, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "when" or "when" or "in response to determining".

[0046] As used herein, the terms “at least one”, “multiple”, “each”, “any of’ or the like, at least one includes one, two or more, multiple includes two or more, each refers to each of the corresponding plurality, and any of refers to any one of the plurality.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing the embodiments of this application only and is not intended to be limiting of this application.

[0048] Before the embodiments of the present application are described in detail, first, some nouns and terms involved in the embodiments of the present application are described, and the nouns and terms involved in the embodiments of the present application are applicable to the following explanations.

[0049] 1) Carbon fiber wound hydrogen storage cylinder, a high-pressure closed container formed by winding process with carbon fiber composite material as the main force structure, used for storing high-pressure gaseous hydrogen, with a nominal working pressure of, for example, 35 MPa or 70 MPa. Its structure mainly includes three layers, liner (barrier layer), used to ensure the gas tightness of the cylinder to prevent hydrogen small molecules from permeating, the cylinder of the embodiments of the present application is a plastic liner containing a valve seat; composite material layer (force bearing layer), formed by winding process of carbon fiber and resin matrix, is the core force bearing part; outer protective layer, also referred to as outer surface in the embodiments of the present application, is glass fiber composite material or wear-resistant coating, used to protect the structural layer from mechanical damage, ultraviolet aging and environmental corrosion and other external environmental influences.

[0050] In the related art, carbon fiber full-winding composite high-pressure hydrogen cylinder has the advantages of high mass hydrogen storage density, fast hydrogen charging and discharging speed and low cost, and is the hydrogen storage device commonly used by hydrogen fuel cell vehicles at present. However, such a cylinder also has its use safety hazards. Since the carbon fiber / epoxy resin-based composite material layer is flammable, when an accident causes the car to catch fire, the cylinder also burns, and the heat is continuously transmitted to the plastic liner through the composite material layer, on the one hand, causing the liner to melt and gradually lose its sealing, and hydrogen leaks to the interface; on the other hand, the carbon fiber / epoxy resin-based composite material continuously softens and pyrolyzes at high temperature, its mechanical properties degrade, causing the overall load-carrying capacity of the cylinder to decrease, if the hydrogen pressure in the cylinder is low or the melting time of the liner is short, the cylinder will leak and fail; if the hydrogen pressure in the cylinder is high and the strength degradation speed of the carbon fiber / epoxy resin-based composite material is fast, the cylinder may explode and fail. Therefore, the fire resistance of the cylinder is an important indicator for evaluating its use safety.

[0051] Currently, the safety performance of the gas cylinder and the temperature driven pressure relief device (TPRD, Thermal Pressure Relief Device) under fire is verified by fire test, which is an important indicator for evaluating the safety of the gas cylinder. However, the research on the thermal response characteristics of the plastic liner carbon fiber full-winding composite gas cylinder under fire is still insufficient, and the evaluation method for the fire resistance of the gas cylinder is still using the evaluation method for the traditional design gas cylinder, which is difficult to accurately evaluate the fire resistance and has poor evaluation accuracy.

[0052] Therefore, the embodiment of the present application provides a fiber-wound hydrogen cylinder fire resistance test method, a test system and related equipment. The scheme performs a fire test on the target cylinder 41 by a fire source, obtains temperature data of the target cylinder 41 at a preset position, the preset position at least includes a composite material layer, in the fire process, whether the target cylinder 41 leaks is judged according to whether the pressure data continuously decreases and whether the characteristic flame generated by the leakage is monitored, and the shape data of the characteristic flame is recorded, so as to analyze the leakage condition through the characteristic flame, then the pressure data is reduced to a preset pressure value, which represents that the gas in the cylinder is basically discharged, the fire test is determined to be completed, the corresponding fire time is obtained, then the integrity of the cylinder in the fire test is evaluated, and the fire resistance of the target cylinder 41 is determined comprehensively according to the evaluation result, the fire time measured in the test, the shape data of the characteristic flame, the temperature data and the pressure data. Compared with the traditional fire resistance test method of the cylinder, the structure of the carbon fiber winding hydrogen storage cylinder is targeted, the temperature of the composite material layer is monitored in the fire test, the analysis of the flame shape is combined, and the integrity evaluation of the composite structure cylinder is designed, so that the fire resistance is comprehensively judged, and the accuracy of the fire resistance evaluation of the carbon fiber winding hydrogen storage cylinder is improved.

[0053] The fiber-wound hydrogen cylinder fire resistance test method provided by the embodiment of the present application relates to the technical field of hydrogen storage cylinders. The present application can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld devices or portable devices, tablet devices, multi-processor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, small computers, mainframe computers, distributed computing environments including any of the above systems or devices, etc. The present application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application can also be practiced in a distributed computing environment, in which tasks are performed by remote processing devices connected by a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media, including storage devices.

[0054] Figure 1 is an optional flowchart of a fiber-wound hydrogen cylinder fire resistance test method provided by the embodiment of the application, Figure 1 The method in the embodiment can include, but is not limited to, steps S101 to S104.

[0055] In step S101, a fire test is performed on the target cylinder 41 by a fire source, and temperature data of a preset position of the target cylinder 41 and pressure data of hydrogen pressure in the cylinder are obtained, the preset position at least including a composite material layer.

[0056] Specifically, before the test process starts, the test environment is arranged according to the test requirements, for example, sensors for collecting data, ignition modules 44 for igniting a fire source, and the like. The fire source and related safety protection measures need to be arranged according to the requirements of GB / T42610 Appendix I to ensure the safety of the test. The devices involved in the test are arranged in their required positions and their working states are adjusted to the states required by the test to complete the preparation before the test.

[0057] On the other hand, a plastic liner carbon fiber wound hydrogen storage cylinder is selected as the target cylinder 41 for testing, sensors for detecting the state of the cylinder are arranged on the target cylinder 41, the valve at the mouth of the target cylinder 41 is connected to the pressurizing system and the pressure source through a pipeline, the target cylinder 41 is filled to a nominal working pressure of 70 MPa, and then the target cylinder 41 is cooled to the ambient temperature, i.e., the preparation work before the test is completed.

[0058] When the test starts, the target cylinder 41 is burned by igniting a fire source, wherein first, a local fire source is started to burn the tail position of the target cylinder 41, and after 10 minutes of burning, a whole fire source is started to burn the whole target cylinder 41, simulating a scenario in which the fire spreads from a local fire to a full-scale fire. In the process of burning, the temperature data of the preset position and the pressure data of the hydrogen pressure in the cylinder are obtained by the sensors arranged in advance to confirm the state of the target cylinder 41, wherein the preset position at least includes the temperature of the composite material layer designed for the carbon fiber winding structure, i.e., the temperature of the composite material layer, in addition to the temperatures at the valve at the mouth and the tail of the cylinder, etc.; the pressure data reflect the pressure inside the cylinder. It can be understood that the pressure will rise due to the thermal expansion of the burning, but the pressure will decrease if the internal gas is released or leaked.

[0059] In step S102, when the pressure data continuously decrease and the characteristic flame of the leakage of the target cylinder 41 is monitored during the burning process, it is determined that the target cylinder 41 leaks, and the shape data of the characteristic flame is monitored and recorded.

[0060] First of all, it needs to be pointed out that the target cylinder 41 is provided with a temperature-driven pressure relief device, which is defined as an automatic pressure relief device in the embodiment of the present application. The device is arranged at the valve and triggered based on temperature. When triggered, it can automatically release the gas in the cylinder to avoid the continuous increase of the pressure in the cylinder affecting the safety. In addition, the release described in the embodiment of the present application refers to a controlled active gas release behavior, and leakage refers to the gas leakage caused by the damage of the cylinder due to fire.

[0061] During the fire process, there are two phenomena that can be used to determine whether the target cylinder 41 leaks. One is to confirm the appearance of a characteristic flame. The characteristic flame can be determined by the position where the flame appears. For example, the flame generated at the valve due to active gas release is not a characteristic flame. The flame ignited on the cylinder can be identified as a characteristic flame. The second is to detect the continuous decrease of the pressure data in the target cylinder 41, which represents that the gas in the cylinder is reducing and flowing to the outside of the cylinder in the form of release or leakage. Based on this, combined with the two conditions, it is determined whether the target cylinder 41 leaks during the fire process. When the pressure data continuously decreases and the characteristic flame appears, it is determined that the target cylinder 41 leaks. When the two conditions are not met at the same time, it is determined that the target cylinder 41 does not leak during the fire test. The gas in the cylinder may be actively released by the automatic pressure relief device.

[0062] In addition, the shape of the characteristic flame, mainly the shape and size of the flame, can help the staff to confirm the degree of leakage and is beneficial to the analysis of the fire resistance performance. Therefore, while monitoring whether the characteristic flame appears, the shape data of the characteristic flame is also recorded to support the data analysis in the subsequent steps.

[0063] Step S103, waiting for the pressure data of the target cylinder 41 to decrease to a preset pressure value, determining that the fire test is ended, and obtaining the corresponding fire time;

[0064] By monitoring the pressure data, it can be determined whether the gas in the target cylinder 41 is completely released or leaked. A preset pressure value is set as a reference, for example, 1 MPa. When the pressure data decreases to the preset pressure value, it is judged that the gas in the cylinder has been sufficiently released or leaked, and it is determined that the fire test is ended. The fire source is turned off, and the data analysis work after the test is started.

[0065] It needs to be pointed out that the gas in the cylinder is either actively released due to the judgment of the automatic pressure relief device or leaked due to damage. If neither active release nor leakage occurs, it means that the state of the target cylinder 41 can still withstand the fire, and the fire test continues. Therefore, only when the pressure data decreases to the preset pressure value, it is determined that the fire test is ended.

[0066] During the whole fire-burning process, the corresponding fire-burning time is also recorded. The fire-burning time can be used as a reference for the whole test, and can also be compared with the time point of the state change of the target gas cylinder 41 during the fire-burning process, such as confirming how much time the automatic pressure relief device is triggered, how much time the characteristic flame of leakage appears, and the like, which can help the staff analyze the fire resistance performance of the target gas cylinder 41.

[0067] In step S104, the integrity of the target gas cylinder 41 after the fire-burning test is evaluated, and the fire resistance performance of the target gas cylinder 41 is determined according to the evaluation result of the integrity evaluation, the fire-burning time, the shape data, the temperature data and the pressure data.

[0068] If the characteristic flame of leakage appears during the fire-burning process, it means that the target gas cylinder 41 has a perforation damage. However, even if the characteristic flame does not appear, there may be invisible damage to the bottle body after the fire-burning. Therefore, the integrity of the target gas cylinder 41 after the fire-burning test is evaluated, and the damage condition of the target gas cylinder 41 at this time is comprehensively analyzed to obtain the evaluation result.

[0069] In addition, the fire-burning time, the shape data of the characteristic flame, the temperature data and the pressure data at different time points during the fire-burning process obtained by the above steps are comprehensively analyzed to evaluate the fire resistance performance of the target gas cylinder 41.

[0070] The steps S101 to S104 shown in the embodiments of the present application are for the structure of the carbon fiber wound hydrogen storage cylinder. In the fire-burning test, the temperature of the composite material layer is also monitored, and the analysis of the flame shape is combined with the integrity evaluation of the composite structure cylinder to comprehensively judge the fire resistance performance, thereby improving the accuracy of the evaluation of the fire resistance performance of the carbon fiber wound hydrogen storage cylinder.

[0071] Reference Figure 2 In step S102 of some embodiments, the shape data of the characteristic flame is monitored and recorded, including:

[0072] In step S201, a characteristic image of the characteristic flame is collected;

[0073] In step S202, the length parameter and the width parameter of the characteristic flame are extracted according to the characteristic image, and the shape data includes the length parameter and the width parameter.

[0074] For the shape of the characteristic flame, it can be understood that the leakage gas flow as the fuel supply directly affects the size of the flame, and the leakage gas flow is also directly related to the leakage degree. Therefore, analyzing the flame shape of the characteristic flame is helpful for the staff to determine the leakage degree.

[0075] In the embodiment, the size of the flame is quantitatively determined by the length and width of the flame. Specifically, a high-speed camera or the like is used to capture an image of the characteristic flame at a high frame rate, which is defined as a characteristic image. For example, the characteristic image is subjected to grayscale processing and binarization, and a foreground portion representing the characteristic flame is extracted based on the luminance difference between the flame and the background. A minimum rectangle that can completely contain the foreground portion is drawn in the image, and the length and width of the characteristic flame are determined based on the minimum rectangle, which are defined as the length parameter and the width parameter, respectively. It can be understood that the length parameter and the width parameter are also parameters that change over time during the fire test.

[0076] In step S104 of some embodiments, integrity evaluation is performed on the target cylinder 41 after the fire test, including:

[0077] In response to the occurrence of leakage of the target cylinder 41 in the fire test, the composite material layer of the target cylinder 41 is scanned by ultrasonic tomography technology to obtain damage data, and the evaluation result includes the damage data.

[0078] In response to the occurrence of leakage of the target cylinder 41 in the fire test, the composite material layer of the target cylinder 41 is scanned by ultrasonic tomography technology to obtain damage data, and the evaluation result includes the damage data.

[0079] Specifically, the integrity evaluation is a comprehensive evaluation of the damage of the target cylinder 41 after the fire. According to the progress of the fire test, it can be divided into two cases. One is that the target cylinder 41 leaks in the fire test, which represents that the target cylinder 41 has obvious damage. The other is that the target cylinder 41 does not leak in the fire test, which represents that the target cylinder 41 does not have obvious damage, but the bottle body still experiences fire, and the gas expands and pressurizes in the internal process, which may have a failure position on the load-bearing structure. Therefore, different integrity evaluation methods are used for the two cases of leakage and non-leakage.

[0080] When it is determined that leakage occurs, the composite material layer (main load-bearing structure) of the target cylinder 41 is scanned by ultrasonic tomography technology. Ultrasonic tomography technology is a technology that uses ultrasonic waves as information carriers to collect the response signals of the object to ultrasonic waves, and can invert the distribution of physical parameters such as acoustic impedance, density, and elasticity inside the object. If there is damage in the composite material layer, the response signals of the damage position to ultrasonic waves will be different, so the damage position and damage degree of the structure can be detected, which is defined as damage data.

[0081] When it is determined that no leakage occurs, the target cylinder 41 is subjected to a water pressure burst test. The water pressure burst test is a destructive test method for evaluating the structural strength, safety performance and failure characteristics of pressure-bearing products (cylinders) by applying pressure to the products through a water medium until they burst. This method takes advantage of the incompressibility and uniformity of pressure transmission of water, fills the test product with water and gradually increases the pressure to simulate the actual pressure-bearing environment. The test records the pressure change, deformation data and failure characteristics throughout the process. Through the water pressure burst test, the residual burst pressure and failure position of the target cylinder 41 after the fire test can be measured. Both parameters can reflect the residual pressure-bearing capacity of the target cylinder 41 after the fire test. The residual burst pressure refers to the pressure value remaining in the system within a short time after the test piece bursts. The lower the value, the more complete the leakage of the medium during the burst, and the more complete the energy release. In the case of complete failure, the higher the value, the smaller the failure opening, and the structure is not completely destroyed. The failure position refers to the specific part of the test piece that first fails (including cracking, perforation and fracture, etc.) in the water pressure burst test. This part actually represents the most severely affected part of the target cylinder 41 in the fire test.

[0082] In other embodiments, the triggering state of the automatic pressure relief device and the backup relief device can also be combined to determine whether a leak has occurred, so as to accurately determine whether to use ultrasonic tomography technology or water pressure burst test for integrity evaluation.

[0083] By performing integrity evaluation on the target cylinder 41 after the fire test, the damage degree of the target cylinder 41 after the fire can be understood, thereby helping to determine the fire resistance of the cylinder.

[0084] Reference Figure 3 In step S104 of some embodiments, the fire resistance of the target cylinder 41 is determined according to the evaluation result of the integrity evaluation, the fire time, the shape data, the temperature data and the pressure data, including:

[0085] Step S301, according to the change of the second temperature, the third temperature and the fourth temperature with time, the first temperature curve, the second temperature curve and the third temperature curve are determined, and the temperature change rule and the temperature conduction hysteresis are determined according to the first temperature curve, the second temperature curve and the third temperature curve;

[0086] Step S302, according to the correlation of the pressure data and each temperature data at different time, the pressure-temperature correlation curve is determined, and the pressure ratio of the pressure data in the fire process to the initial pressure data is calculated, the pressure change rule is determined according to the pressure-temperature correlation curve and the pressure ratio;

[0087] Step S303, the mapped leakage level is determined according to the length parameter and the width parameter;

[0088] Step S304, the fire resistance performance of the target cylinder 41 is determined by evaluating the results, the fire time, the temperature change rule, the temperature conduction hysteresis, the pressure change rule and the leakage level.

[0089] It should be noted that there is currently a lack of a specific and unique quantitative index for summarizing the fire resistance performance of the carbon fiber wound hydrogen storage cylinder. The fire resistance performance is usually reflected in multiple indexes, and each index may have different requirements according to the needs of its application scenario. Therefore, the present embodiment also only sets multiple indexes to comprehensively reflect the fire resistance performance of the cylinder from multiple dimensions to provide comprehensive data reference for the staff.

[0090] Specifically, in the temperature direction, more preset positions are set in combination with the layered structure design of the carbon fiber wound hydrogen storage cylinder. Sensors capable of collecting temperature data are arranged at the one-half thickness of the composite material layer, the outer surface of the liner and the outer surface of the target cylinder 41. Referring to Figure 6 , Figure 6 The cross-sectional view including the target cylinder 41 is equivalent to collecting temperature data at three different depths of the cylinder wrapping structure, which are defined as the second temperature, the third temperature and the fourth temperature, respectively. According to the changes of the second temperature, the third temperature and the fourth temperature with time, the first temperature curve, the second temperature curve and the third temperature curve are determined, and the temperature change rule and the temperature conduction hysteresis are extracted therefrom. The temperature change rule reflects the influence degree of different structures of the cylinder when it is subjected to fire, and the temperature conduction hysteresis reflects the efficiency of high temperature transmission between different structure layers, for example, the efficiency of conduction from the composite material layer to the outer surface of the liner.

[0091] On the other hand, in the pressure direction, the pressure data can directly reflect the state change of the target cylinder 41. For example, when the cylinder is initially heated by fire, the temperature rises and the gas expands, the pressure increases. After the gas is released or leaked, the pressure will decrease, and different damage degrees of the cylinder will also be reflected in the pressure drop rate. In order to correlate and analyze, the pressure-temperature correlation curves of the pressure and the second temperature, the third temperature and the fourth temperature are determined, and the pressure ratio of the pressure data during the fire process to the initial pressure data (70 MPa) is determined. The pressure abnormal time is analyzed. The pressure abnormal time can include the time of abnormal pressure increase or abnormal pressure decrease, which is determined by analyzing the change slope of the curve. Based on the pressure abnormal time, the fire time and the state change of the target cylinder 41 are compared, the influence of the fire and the state change of the cylinder on the internal pressure can be understood, and the pressure change rule is determined.

[0092] In addition, as described in the above embodiments, the flame shape of the characteristic flame is directly related to the degree of gas leakage, and for the degree of gas leakage, a corresponding leakage level can be preset, and the leakage level is associated with different sizes of flame shapes, for example, if the flame length is greater than 2 meters, it is judged as a high-risk leakage level. By analyzing the changes of the length parameter and the width parameter, the leakage level corresponding to the characteristic flame of the leakage occurrence is determined. If the target gas cylinder 41 does not leak in the fire test, the analysis and processing of the leakage level can be skipped. For the fire burning time, the time itself is an important dimension reflecting the fire resistance performance.

[0093] By summarizing the evaluation results, temperature change law, temperature conduction hysteresis, pressure change law and leakage level of the integrity evaluation obtained by analyzing the above steps, the staff can comprehensively understand the state of the target gas cylinder 41 in the fire test and after the fire test, and thus comprehensively judge the fire resistance performance. The accuracy of analyzing the fire resistance performance of the carbon fiber winding hydrogen storage cylinder is improved.

[0094] In some embodiments, the above embodiment steps further comprise:

[0095] In response to the first temperature reaching the first relief temperature, triggering the automatic pressure relief device to release the in-cylinder gas of the target gas cylinder 41 from the valve through the automatic pressure relief device;

[0096] In response to the second temperature reaching the second relief temperature and the automatic pressure relief device being in an untriggered state, triggering the standby relief device at the cylinder tail to release the in-cylinder gas from the cylinder tail through the standby relief device.

[0097] Optionally, the target gas cylinder 41 can be provided with a standby relief device in addition to the automatic pressure relief device, which serves as an insurance measure when the automatic pressure relief device fails. The trigger temperature of the automatic pressure relief device is defined as the first relief temperature. Generally, when the first temperature at the valve reaches the first relief temperature, the automatic pressure relief device is triggered, and the gas is released from the valve. However, if an abnormal condition occurs and the automatic pressure relief device is not triggered, another means is needed to release the in-cylinder gas. The present embodiment solves this problem by providing a standby relief device at the cylinder tail. The cylinder tail is provided with an end plug, and the standby relief device can control the end plug to release the in-cylinder gas. The standby relief device is associated with a second temperature for triggering. When the second temperature reaches the second relief temperature, the standby relief device is triggered, avoiding the possibility that the valve has failed and releasing the in-cylinder gas from the cylinder tail. The second relief temperature is set to, for example, 120 The temperature is the softening temperature of the resin, which represents the beginning of the problem of the composite material layer.

[0098] Please refer to Figure 4 , 5The embodiment of the application also provides a fiber-wound hydrogen cylinder fire resistance testing system, which is used for the method in any of the above embodiments, and the system comprises:

[0099] The temperature detection module 42 is used for collecting temperature data of the preset positions of the target cylinder 41, and the preset positions at least include the composite material layer.

[0100] Specifically, the temperature detection module 42 is a sensor for detecting temperature, and is used for collecting temperature data of the preset positions. In some embodiments, corresponding to the preset positions in the above embodiments, the temperature detection module 42 comprises temperature sensors arranged at the valve of the target cylinder 41 (for collecting a first temperature) and the bottle tail (for collecting a second temperature), fiber Bragg grating temperature sensors 423 arranged at the one-half thickness of the composite material layer (for collecting a third temperature) and the outer surface of the liner (for collecting a fourth temperature), and thermocouples 424 arranged at the outer surface of the target cylinder 41 (for collecting a fifth temperature). The temperature sensor, the fiber Bragg grating temperature sensor 423 and the thermocouple 424 all have the ability to detect temperature, and corresponding devices are selected to adapt to the positions where they are arranged.

[0101] Since there is no special condition requirement at the valve and the bottle tail, a temperature sensor can be selected, for reference Figure 5 The temperature detection module 42 can be divided into a first temperature sensor 421 arranged at the valve and a second temperature sensor 422 arranged at the bottle tail. The fiber Bragg grating temperature sensor 423 is suitable for measuring the temperature inside the structure of the target cylinder 41, and has a temperature measurement range of 200 , a temperature measurement accuracy of , and needs to be wound to the outer surface of the liner at the winding stage of the cylinder, and then wound to the composite material layer together with the carbon fiber composite material. The arrangement can be distributed with 4 to 5 fiber Bragg grating temperature sensors 423 at equal intervals along the cylinder barrel, 1 every 90° in the circumferential direction, 4 in total in the circumferential direction, to form a distribution effect as shown in Figure 6 In addition, the part of the fiber Bragg grating temperature sensor 423 that will be in contact with the flame can also be wrapped with a non-combustible fireproof tape to ensure the normal temperature detection function during the fire test. The fiber Bragg grating temperature sensor 423 also needs to be connected to a demodulator, and then connected to a remote control terminal through the demodulator, and the temperature data collected by the fiber Bragg grating temperature sensor 423 is extracted through demodulation processing. The outer surface of the cylinder will directly contact the flame, and the thermocouple 424 has the characteristics of high temperature resistance, so the thermocouple 424 is selected for the outer surface of the cylinder. The arrangement number of the thermocouples 424 on the outer surface of the cylinder can refer to the fiber Bragg grating temperature sensor 423, and a plurality of thermocouples 424 are arranged in the axial and circumferential directions to form a distribution effect as shown in Figure 6 .

[0102] The temperature detection modules 42 are arranged to form an array, and corresponding sensors are selected according to structural environmental differences, so as to realize detection of temperature data at various structural positions of the target cylinder 41, thereby supporting subsequent comprehensive analysis of the fire resistance of the target cylinder 41.

[0103] The pressure detection module 43 is configured to collect pressure data of hydrogen pressure in the target cylinder 41.

[0104] In some embodiments, the pressure detection module 43 includes a high-precision pressure sensor 431, which is arranged at a gas inlet pipeline of the target cylinder 41. Based on the pipeline, the high-precision pressure sensor 431 can collect pressure data of hydrogen pressure in the target cylinder 41 in real time, thereby realizing pressure monitoring.

[0105] The ignition module 44 is configured to generate a fire source to perform a fire test on the target cylinder 41.

[0106] The flame monitoring module 45 is configured to monitor a characteristic flame generated by leaked gas of the target cylinder 41.

[0107] In some embodiments, the flame monitoring module 45 includes an infrared gas imager 451 and a high-speed camera 452. The infrared gas imager 451 is configured to capture the characteristic flame, and the high-speed camera 452 is configured to capture a dynamic image of the characteristic flame. The infrared gas imager 451 is arranged on both sides of the target cylinder 41 in the axial direction, and at least one infrared gas imager 451 is arranged on each side. Since the flame itself releases a large amount of infrared radiation, the infrared gas imager 451 can capture the characteristic flame generated by the combustion of the leaked gas, thereby realizing monitoring of whether the characteristic flame representing gas leakage appears on the target cylinder 41. The analysis of the flame shape of the characteristic flame is performed by the high-speed camera 452. The high-speed camera 452 is arranged in the direct direction of the target cylinder 41 to focus on the characteristic flame on the target cylinder 41 as much as possible. The high-speed camera 452 can record a dynamic image of the characteristic flame at a high frame rate, thereby supporting analysis of the shape of the characteristic flame based on the image. It should be noted that Figure 5 The positions of the infrared gas imager 451 and the high-speed camera 452 are only illustrative, and are not used to limit the positions on the two sides or the direct position.

[0108] The test control module 46 is configured to determine whether the target cylinder 41 leaks according to the pressure data and the characteristic flame, to determine whether the fire test is completed according to the pressure data, and to determine the fire time. The test control module 46 can realize automatic performance of the entire test process.

[0109] The data analysis module 47 is configured to extract shape data according to the characteristic flame, to perform integrity evaluation on the target cylinder 41 after the fire test, and to determine the fire resistance of the target cylinder 41 according to the evaluation result of the integrity evaluation, the fire time, the shape data, the temperature data, and the pressure data.

[0110] The test control module 46 and the data analysis module 47 can include several connected devices, terminals or servers to provide computing power to process data analysis tasks.

[0111] It can be understood that the contents in the above method embodiments are applicable to the system embodiments, the system embodiments specifically implement the functions same as the above method embodiments, and achieve the same beneficial effects as the above method embodiments.

[0112] Next, the scheme of the embodiments of the present application will be described and explained in detail in combination with specific application examples:

[0113] In the embodiments of the present application, a fiber-wound hydrogen cylinder fire resistance testing method and testing system are provided. Before starting the fire resistance testing, the testing system is arranged, and the type of the target cylinder 41 is selected. In the embodiments, the parameters of the target cylinder 41 are as follows: nominal working pressure 70 MPa, fiber stress ratio 2, water volume 63 L, total length 860 mm, liner made of PA6 material, inner diameter 343 mm, winding layer material carbon fiber epoxy resin-based composite material, thickness 26 mm, and the valve at the cylinder mouth is a multifunctional valve. The first temperature sensor 421 is arranged at the valve of the target cylinder 41, the second temperature sensor 422 at the cylinder tail can be directly selected as an end plug with a temperature sensor, the fiber Bragg grating temperature sensor 423 is arranged at the one-half thickness (13 mm) of the composite material layer of the target cylinder 41 and the outer surface of the liner, and the thermocouple 424 is arranged at the outer surface of the target cylinder 41. The fiber Bragg grating temperature sensor 423 needs to be pre-embedded during the winding stage of the cylinder. Temperature data collection at multiple positions is realized through the temperature sensor, the fiber Bragg grating temperature sensor 423 and the thermocouple 424. On the other hand, the pressure detection module 43, the ignition module 44, the flame monitoring module 45, the test control module 46 and the data analysis module 47 are arranged. The flame monitoring module 45 includes an infrared gas imager 451 for shooting and capturing the characteristic flame generated by the leaked gas, and a high-speed camera 452 for shooting dynamic images of the characteristic flame. The test control module 46 is used to control the test process and realize the automation of the test. In the following description, the control and judgment through the test control module 46 will not be specifically described.

[0114] After the test system is arranged, the target cylinder 41 is filled to the nominal pressure, and the fire resistance test is started. The ignition module 44 generates a fire source, and the target cylinder 41 is subjected to a fire test by using the fire source. During the fire test, the first temperature at the valve of the target cylinder 41 is obtained by the temperature sensor, the second temperature at the half-thickness of the composite material layer and the third temperature on the outer surface of the liner are obtained by the fiber Bragg grating temperature sensor 423, the fourth temperature on the outer surface of the target cylinder 41 is obtained by the thermocouple 424, and the pressure data of the hydrogen pressure in the target cylinder 41 is obtained by the pressure detection module 43.

[0115] Then, the state of the target cylinder 41 is monitored. During the fire test, when the first temperature reaches the first relief temperature, the automatic pressure relief device is triggered to release the gas in the cylinder from the valve through the automatic pressure relief device. When the second temperature reaches the second relief temperature and the automatic pressure relief device has not been triggered, the standby relief device arranged at the cylinder tail is triggered to release the gas in the cylinder from the cylinder tail through the standby relief device. In addition, when the pressure data continues to decrease and the characteristic flame of the target cylinder 41 leakage is monitored by the infrared gas imager 451, it is determined that the target cylinder 41 has leaked, and the characteristic image of the characteristic flame is collected by the high-speed camera 452. The data analysis module 47 extracts the length parameter and the width parameter of the characteristic flame according to the characteristic image to obtain the shape data of the characteristic flame.

[0116] The pressure data of the target cylinder 41 is waited to decrease to a preset pressure value, and it is determined that the fire test is completed, and the corresponding fire time is obtained. Then, through the data analysis module 47, if the target cylinder 41 leaks during the fire test, the composite material layer of the target cylinder 41 is scanned by the ultrasonic tomography technology to perform integrity evaluation, and damage data is obtained, that is, the evaluation result is obtained; if the target cylinder 41 does not leak during the fire test, the target cylinder 41 is subjected to a water pressure explosion test to perform integrity evaluation, and the residual explosion pressure and the failure position are obtained, that is, the evaluation result is obtained. And continue to determine the first temperature curve, the second temperature curve and the third temperature curve according to the changes of the second temperature, the third temperature and the fourth temperature with time, further determine the temperature change rule and the temperature conduction hysteresis according to the first temperature curve, the second temperature curve and the third temperature curve. According to the correlation of the pressure data and each temperature data at different times, the pressure-temperature correlation curve is determined, the pressure ratio of the pressure data in the fire process to the initial pressure data (70 MPa) is calculated, and the pressure change rule is determined according to the pressure-temperature correlation curve and the pressure ratio. For the characteristic flame, the mapped leakage level is determined according to the length parameter and the width parameter. Finally, the fire resistance of the target cylinder 41 is determined by comprehensively considering the evaluation result of the integrity evaluation, the fire time, the temperature change rule, the temperature conduction hysteresis, the pressure change rule and the leakage level.

[0117] The fire burning test is performed on the target gas cylinder 41 by a fire source, temperature data of the target gas cylinder 41 at a preset position is obtained, the preset position at least includes a composite material layer, during the fire burning process, whether the target gas cylinder 41 leaks is judged according to whether the pressure data continuously decreases and whether a characteristic flame generated by leakage is monitored, and the shape data of the characteristic flame is recorded, so as to analyze the leakage condition through the characteristic flame, then the pressure data is waited to decrease to a preset pressure value, which represents that the gas in the gas cylinder is basically discharged, the fire burning test is determined to be completed, the corresponding fire burning time is obtained, then the gas cylinder in the fire burning test can be evaluated for integrity, and the fire resistance of the target gas cylinder 41 is determined in combination with the evaluation result, the fire burning time measured in the test, the shape data of the characteristic flame, the temperature data and the pressure data. Compared with the traditional gas cylinder fire resistance test method, the structure of the carbon fiber winding hydrogen storage cylinder is targeted, the temperature of the composite material layer is monitored in the fire burning test, the analysis of the flame shape is combined, and the integrity evaluation designed for the composite structure gas cylinder is combined, the fire resistance is comprehensively judged, and the accuracy of the fire resistance evaluation of the carbon fiber winding hydrogen storage cylinder is improved.

[0118] The embodiment of the present application further provides a computer device, the computer device comprises a memory and a processor, the memory stores a computer program, and the processor realizes the method described above when executing the computer program. The computer device can be any intelligent terminal including a tablet computer, a vehicle-mounted computer and the like.

[0119] It can be understood that the contents in the method embodiments described above are applicable to the device embodiments, the device embodiments specifically realize the functions of the method embodiments described above, and achieve the same beneficial effects as the method embodiments described above.

[0120] Please refer to Figure 7 , Figure 7 The hardware structure of the computer device of another embodiment is illustrated, and the computer device comprises:

[0121] The processor 701 can be implemented in a general-purpose CPU (Central Processing Unit), a microprocessor, an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits, and is used to execute related programs to realize the technical solutions provided by the embodiments of the present application.

[0122] The memory 702 can be implemented in the form of a Read Only Memory (ROM), a static storage device, a dynamic storage device, or a Random Access Memory (RAM), etc. The memory 702 can store an operating system and other application programs, and when the technical solutions provided by the embodiments of the present specification are implemented by software or firmware, the related program codes are stored in the memory 702 and are called and executed by the processor 701 to perform the above-mentioned method of the embodiments of the present application;

[0123] The input / output interface 703 is configured to realize information input and output.

[0124] The communication interface 704 is configured to realize the communication interaction between the device and other devices, and can realize the communication through a wired manner (for example, a USB, a network cable, etc.) or a wireless manner (for example, a mobile network, WIFI, Bluetooth, etc.).

[0125] The bus 705 is configured to transmit information between various components (for example, the processor 701, the memory 702, the input / output interface 703, and the communication interface 704) of the device.

[0126] The processor 701, the memory 702, the input / output interface 703, and the communication interface 704 are connected to each other through the bus 705 to realize the communication connection between the device.

[0127] The embodiments of the present application also provide a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the above-mentioned method.

[0128] It can be understood that the contents in the above-mentioned method embodiments are all applicable to the present storage medium embodiments. The functions specifically implemented by the present storage medium embodiments are the same as those of the above-mentioned method embodiments, and the beneficial effects achieved by the present storage medium embodiments are also the same as those achieved by the above-mentioned method embodiments.

[0129] The memory is a non-transitory computer readable storage medium, which can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory can optionally include a memory remotely arranged relative to the processor, and these remote memories can be connected to the processor through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0130] The fiber-wound hydrogen cylinder fire resistance testing method, testing system and related equipment provided by the embodiments of the present application perform a fire test on the target cylinder through a fire source, obtain temperature data of the target cylinder at a preset position, the preset position at least including a composite material layer, in the fire process, whether the target cylinder leaks is judged according to whether the pressure data continuously decreases and whether a characteristic flame generated by the leakage is monitored, and the shape data of the characteristic flame is recorded, so as to analyze the leakage condition through the characteristic flame, then the pressure data is waited to decrease to a preset pressure value, which represents that the gas in the cylinder is basically discharged, the fire test is determined to be ended, the corresponding fire time is obtained, then the cylinder in the fire test can be evaluated for integrity, and the fire resistance of the target cylinder is determined comprehensively in combination with the evaluation result, the fire time measured in the test, the shape data of the characteristic flame, the temperature data and the pressure data. Compared with the traditional cylinder fire resistance testing method, the present application is aimed at the structure of the carbon fiber-wound hydrogen storage cylinder, the temperature of the composite material layer is monitored in the fire test, the analysis of the flame shape is combined, and the integrity evaluation designed for the composite structure cylinder is combined, so that the fire resistance is comprehensively judged, and the accuracy of the fire resistance evaluation of the carbon fiber-wound hydrogen storage cylinder is improved.

[0131] The embodiments described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0132] Those skilled in the art can understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and can include more or fewer steps than the figures shown, or combine certain steps or different steps.

[0133] The device embodiments described above are only schematic, and the units illustrated as separate components can or can not be physically separate, that is, can be located in one place, or can be distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0134] Those skilled in the art can understand that all or some of the steps in the above disclosed method, the function modules / units in the system and the device can be implemented as software, firmware, hardware and their appropriate combinations.

[0135] The terms "first", "second", "third", "fourth", and the like in the description and in the claims of this application, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of the terms so termed is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of orderly or chronological mundane operation, reverse order operation, based on circuitry availability, based on stated preference or the like, and that "default" or other orderings are thus permissible. Further, the terms "comprise", "comprising", "include", "including", and the like, are specifically intended to be open-ended. That is, references to individual steps and the like do not suhstantially exclude the presence of two or more of a recited step or its integral sub-steps or additional steps whether or not readily ascertainable from the description or the like. Further, the words "a" or "an", as used herein in the disclosure and elsewhere, are used indiscriminately and are to be interpreted in the same way, i.e. as meaning "one or more".

[0136] It should be understood that, in this application, "at least one" means one or more, "multiple" means two or more. "And / or" is used to describe the relationship between associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that there are only A, only B, and A and B at the same time. The character " / " generally represents an "or" relationship between the associated objects. "At least one of the following" or the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0137] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the above units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be omitted or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed objects can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0138] The units described above as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e. they can be located in one place or distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0139] In addition, each function unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit.

[0140] If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, essentially or in part, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes multiple instructions used to cause a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program storage media.

[0141] The preferred embodiments of the embodiments of the present application are described above with reference to the accompanying drawings, and the scope of the rights of the embodiments of the present application is not limited thereto. Any modifications, equivalent replacements and improvements made by those skilled in the art without departing from the scope and essence of the embodiments of the present application shall be within the scope of the rights of the embodiments of the present application.

Claims

1. A method for testing the fire resistance of a fiber-wound hydrogen cylinder, characterized by, The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: During the fire test, when the pressure data continuously decreases and the characteristic flame generated by the leakage of the target cylinder is monitored, it is determined that the target cylinder has leaked, and the shape data of the characteristic flame is recorded; Wait for the pressure data of the target cylinder to decrease to a preset pressure value, determine that the fire test is completed, and obtain the corresponding fire time; Perform integrity evaluation on the target cylinder after the fire test, and determine the fire resistance performance of the target cylinder according to the evaluation result of the integrity evaluation, the fire time, the shape data, the temperature data and the pressure data; The temperature data includes a first temperature at the valve of the target cylinder, and a second temperature at one-half thickness of the composite material layer, and the valve is provided with an automatic pressure relief device, and the fire test further comprises: In response to the first temperature reaching a first relief temperature, the automatic pressure relief device is triggered to release the gas in the target cylinder from the valve through the automatic pressure relief device; In response to the second temperature reaching a second relief temperature and the automatic pressure relief device being in an untriggered state, a backup relief device at the tail of the cylinder is triggered to release the gas in the cylinder from the tail through the backup relief device; The monitoring and recording of the shape data of the characteristic flame comprises: Collecting a characteristic image of the characteristic flame; Performing grayscale and binaryzation processing on the characteristic image, extracting a foreground part representing the characteristic flame through the brightness difference between the flame and the background, drawing a minimum rectangle that can completely contain the foreground part in the characteristic image, determining a length parameter and a width parameter according to the minimum rectangle, and the shape data comprises the length parameter and the width parameter; The integrity evaluation of the target cylinder after the fire test comprises: In response to the target cylinder leaking during the fire test, scanning the composite material layer of the target cylinder through ultrasonic tomography technology to obtain damage data, and the evaluation result comprises the damage data; 2. The method of claim 1, wherein, In response to the target cylinder not leaking during the fire test, performing a water pressure explosion test on the target cylinder to obtain a residual explosion pressure and a failure position, and the evaluation result comprises the residual explosion pressure and the failure position. The temperature data includes a second temperature at one-half thickness of the composite material layer, a third temperature at the outer surface of the inner container, and a fourth temperature at the outer surface of the target cylinder, the shape data includes a length parameter and a width parameter of the characteristic flame, and the determination of the fire resistance performance of the target cylinder according to the evaluation result of the integrity evaluation, the fire time, the shape data, the temperature data and the pressure data comprises: determining a first temperature curve, a second temperature curve and a third temperature curve according to changes of the second temperature, the third temperature and the fourth temperature over time, and determining a temperature change rule and a temperature conduction hysteresis according to the first temperature curve, the second temperature curve and the third temperature curve; determining a pressure-temperature correlation curve according to correlations between the pressure data and the temperature data at different time points, and calculating a pressure ratio of the pressure data to initial pressure data in the fire-burning process, and determining a pressure change rule according to the pressure-temperature correlation curve and the pressure ratio; determining a mapped leakage level according to the length parameter and the width parameter; determining the fire resistance performance of the target gas cylinder according to the evaluation result, the fire-burning time, the temperature change rule, the temperature conduction hysteresis, the pressure change rule and the leakage level.

3. A fiber-wound hydrogen cylinder fire resistance testing system for use in the method of any one of claims 1 to 2, characterized by, The system comprises: a temperature detection module configured to collect temperature data of a target gas cylinder at preset positions, the preset positions including at least a composite material layer; a pressure detection module configured to collect pressure data of hydrogen gas in the target gas cylinder; an ignition module configured to generate a fire source to perform a fire-burning test on the target gas cylinder; a flame monitoring module configured to monitor a characteristic flame generated by leaked gas of the target gas cylinder; a test control module configured to determine whether the target gas cylinder leaks according to the pressure data and the characteristic flame, determine whether the fire-burning test is completed according to the pressure data, and determine a fire-burning time; a data analysis module configured to extract shape data according to the characteristic flame, perform integrity evaluation on the target gas cylinder after the fire-burning test, and determine the fire resistance performance of the target gas cylinder according to an evaluation result of the integrity evaluation, the fire-burning time, the shape data, the temperature data and the pressure data; the temperature data includes a first temperature at a valve of the target gas cylinder, and a second temperature at a half thickness of the composite material layer, the valve is provided with an automatic pressure relief device, and the fire-burning process further comprises: in response to the first temperature reaching a first relief temperature, triggering the automatic pressure relief device to relieve the gas in the target gas cylinder from the valve through the automatic pressure relief device; in response to the second temperature reaching a second relief temperature and the automatic pressure relief device being in a non-triggered state, triggering a backup relief device at a tail of the target gas cylinder to relieve the gas in the target gas cylinder from the tail through the backup relief device; the monitoring records shape data of the characteristic flame, including: collecting a characteristic image of the characteristic flame; performing grayscale and binarization processing on the characteristic image, extracting a foreground part representing the characteristic flame through a brightness difference between the flame and the background, drawing a minimum rectangle that can completely contain the foreground part in the characteristic image, determining a length parameter and a width parameter according to the minimum rectangle, and the shape data includes the length parameter and the width parameter; the integrity evaluation on the target gas cylinder after the fire-burning test includes: In response to the target gas cylinder leaking in the fire test, scanning the composite material layer of the target gas cylinder by ultrasonic tomography technology to obtain damage data, and the evaluation result comprises the damage data; In response to the target gas cylinder not leaking in the fire test, performing a water pressure burst test on the target gas cylinder to obtain a residual burst pressure and a failure position, and the evaluation result comprises the residual burst pressure and the failure position.

4. The system of claim 3, wherein, The temperature detection module comprises a temperature sensor, a fiber grating temperature sensor and a thermocouple, the temperature sensor is arranged at the valve and the bottle tail of the target gas cylinder, the fiber grating temperature sensor is arranged at the two-halves thickness of the composite material layer and the outer surface of the inner container, and the thermocouple is arranged at the outer surface of the target gas cylinder and the valve, and the preset position comprises the valve, the bottle tail, the two-halves thickness of the composite material layer, the outer surface of the inner container and the outer surface of the gas cylinder.

5. The system of claim 3, wherein, The flame monitoring module comprises an infrared gas imager and a high-speed camera, the infrared gas imager is used for capturing the characteristic flame, and the high-speed camera is used for capturing the dynamic image of the characteristic flame.

6. A computer apparatus, comprising: The computer device comprises a memory and a processor, the memory stores a computer program, and the processor realizes the method of any one of claims 1 to 2 when executing the computer program.

7. A computer-readable storage medium storing a computer program, wherein the computer program comprises the following steps of: receiving a request for a resource from a client; determining whether the client is authorized to access the resource; and if the client is authorized to access the resource, providing the resource to the client. The computer program is executed by the processor to realize the method of any one of claims 1 to 2.

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