A method, system and device for testing rupture discs in a hydrogen environment

Abstract

The application discloses a kind of hydrogen environment under rupture disc burst test method, system and device, it is related to material physical property testing technical field, the method includes: to the controlled test pipeline is admitted to sweep and blow gas, when monitoring data is lower than threshold value, to the controlled test pipeline is admitted to hydrogen;Control the temperature of test cavity reaches preset temperature value and pressurize hydrogen to preset target pressure value;Real-time acquisition hydrogen pressure;Pressure rising rate is controlled by preset composite control algorithm;Real-time acquisition hydrogen concentration data, analyze pressure variation characteristics;When hydrogen concentration data exceeds threshold value, or when pressure variation characteristics meet burst judgment characteristics, execute safety interlock instruction.The application solves the problem that the prior art cannot carry out burst performance test under hydrogen environment by staged pressurization and pressure rising rate closed-loop control, and simultaneously cannot accurately test and evaluate the hydrogen blast performance of rupture disc, realizes the burst performance test and evaluation of hydrogen rupture disc in simulated real environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material physical property testing, in particular to a rupture disc explosion test method, system and device under a hydrogen environment. BACKGROUND

[0002] As a clean and efficient secondary energy, the safety of hydrogen storage and transportation equipment is the cornerstone of the industry development. The rupture disc is the core safety relief accessory of hydrogen-containing equipment such as hydrogen storage pressure vessels and pipelines, and is the last safety barrier to prevent equipment from bursting due to overpressure. The accurate explosion and reliable sealing of the rupture disc under the preset pressure directly determine the safety level of the entire hydrogen-containing system. Therefore, it is of great significance to accurately test and evaluate the explosion performance of the hydrogen-containing rupture disc under actual harsh working conditions.

[0003] However, hydrogen storage equipment under a hydrogen environment often faces complex and harsh working conditions. First, hydrogen has the characteristics of small molecules, strong permeability, flammability and explosiveness, and can easily cause hydrogen embrittlement effect of metal materials, leading to deterioration of the mechanical properties of the rupture disc. Second, the actual operation conditions of hydrogen-containing equipment are complex, covering ultra-high pressure and wide temperature range changes. The ultra-high pressure changes, such as 70 MPa or more to 200 MPa, and the wide temperature range changes, such as -40℃ to 120℃.

[0004] In the face of the above complex and harsh working conditions under a hydrogen environment, the existing rupture disc test technology is mainly aimed at inert media such as air and nitrogen, lacks essential safety protection design for hydrogen, and does not integrate high-precision temperature control and ultra-high pressure hydrogen generation capability, making it impossible to simulate real hydrogen, ultra-high pressure, and variable temperature combined conditions under safe and controlled conditions, and thus it is difficult to accurately determine the real explosion performance of the rupture disc under such conditions. SUMMARY

[0005] The purpose of the present application is to provide a rupture disc explosion test method, system and device under a hydrogen environment, which integrates ultra-high pressure and wide temperature range simulation, staged pressurization, closed-loop control of pressurization rate, etc., solves the technical problems that the existing technology cannot simulate high-precision temperature control and ultra-high pressure hydrogen under safe and controlled conditions, and cannot perform accurate explosion test, and realizes the safety test and evaluation of the hydrogen-containing rupture disc under simulated real environment.

[0006] To achieve the above purpose, the present application provides the following solutions:

[0007] In a first aspect, the application provides a method for testing a rupture disc in a hydrogen environment, executed by a test system, comprising: controlling a gas path actuator to introduce a sweep gas into a controlled test pipeline, and obtaining monitoring data fed back by an environmental composition sensor; when the oxygen content and moisture content in the monitoring data are lower than an oxygen content threshold and a moisture content threshold respectively, controlling the gas path actuator to switch to introducing hydrogen into the controlled test pipeline; controlling a temperature control actuator to bring the temperature of a test cavity containing the rupture disc to a preset temperature value; controlling a gas pressurization actuator to pressurize the hydrogen to a preset target pressure value; obtaining in real time the hydrogen pressure fed back by a pressure sensor and the arch height displacement value of the rupture disc fed back by a displacement sensor during the test process of supplying the pressurized hydrogen to the test cavity; based on the hydrogen pressure and a preset target pressure rise rate, controlling the opening degree of a hydrogen flow regulating actuator by a preset composite control algorithm to close-loop control the pressure rise rate in the test cavity; obtaining in real time the hydrogen concentration data fed back by a hydrogen concentration sensor during the test process, and analyzing the pressure change characteristics of the hydrogen pressure; when the hydrogen concentration data exceeds a preset concentration alarm threshold, or when the pressure change characteristics meet a preset rupture judgment characteristic, executing a safety interlock instruction; wherein the safety interlock instruction comprises: controlling the gas path actuator to cut off the hydrogen supply, and controlling a safety relief actuator to start a safety relief passage.

[0008] Optionally, the control of the gas pressurization actuator to pressurize the hydrogen to a preset target pressure value comprises: judging whether the preset target pressure value reaches a preset pressure threshold; if the preset target pressure value is less than the preset pressure threshold, controlling the gas pressurization actuator to operate in a primary pressurization mode, which comprises: controlling a primary gas pressurization pump to operate, and cooling the hydrogen output after operation; if the preset target pressure value is greater than or equal to the preset pressure threshold, controlling the gas pressurization actuator to enable a staged pressurization mode, which comprises: first controlling the primary gas pressurization pump to operate, and then controlling a secondary gas pressurization pump to operate; wherein the hydrogen is cooled after the operation of the primary gas pressurization pump and before the operation of the secondary gas pressurization pump.

[0009] Optionally, based on the hydrogen pressure and a preset target pressure rise rate, the opening degree of a hydrogen flow regulating actuator is controlled by a preset composite control algorithm to close-loop control the pressure rise rate in the test cavity, specifically comprising: filtering the hydrogen pressure; based on the filtered hydrogen pressure, calculating an actual pressure rise rate; calculating the rate error between the actual pressure rise rate and the preset target pressure rise rate; based on the rate error, calculating a total control amount by the preset composite control algorithm; distributing the total control amount into an opening degree control instruction for the hydrogen flow regulating actuator and a driving gas pressure adjusting instruction for the gas pressurization actuator, and outputting for execution.

[0010] Optionally, the gas pressurizing mechanism is driven by a gas pressure regulation instruction for regulating the pressure of the driving gas pressurized to the buffer gas source; and the closed-loop control adjusts the hydrogen gas from the buffer gas source.

[0011] Optionally, the calculation formula for calculating the actual boost rate is: , wherein, t is the current time, is the actual boost rate, P is the real-time hydrogen pressure, and Δt is the sampling period. t Optionally, the mathematical model of the preset composite control algorithm is

[0012] , wherein, is the current time, t is the total control amount, is the proportional coefficient, is the rate error, is the integral coefficient, is the differential coefficient, is the feedforward compensation amount; the proportional coefficient, the integral coefficient, and the differential coefficient are segmented and valued according to the pressure range in which the preset target pressure value is located. Optionally, the mathematical model of the feedforward compensation amount is:

[0013] , wherein, is the current time, t is the preset boost rate, is the real-time pressure, P is the real-time temperature, t is the reference temperature, k1 is the rate compensation coefficient, k2 is the pressure compensation coefficient, and k3 is the temperature compensation coefficient. T t

[0014] In a second aspect, the present application provides a rupture disc explosion test system in a hydrogen environment, comprising: a control unit, and a gas path execution mechanism, an environmental component sensor, a temperature control execution mechanism, a gas pressurizing mechanism, a pressure sensor, a hydrogen flow regulation mechanism, a hydrogen concentration sensor, and a safety relief execution mechanism in communication connection with the control unit; wherein the control unit is configured to execute the above-mentioned rupture disc explosion test method in a hydrogen environment.

[0015] ​​​Optionally, a cooling unit is further included and is in communication connection with the control unit; the control unit is further configured to control the cooling unit to cool the output hydrogen after controlling the operation of the primary gas booster pump; in the staged pressurization mode, the cooling unit is controlled to cool the hydrogen after the operation of the primary gas booster pump and before the operation of the secondary gas booster pump.

[0016] In a third aspect, the present application provides a rupture disc explosion testing device in a hydrogen environment, comprising: a temperature control box, a test tool, a gas pressurization mechanism, a gas buffer tank, a safety relief structure, and an arch height displacement measurement mechanism; the temperature control box constitutes a closed temperature control environment, and the test tool is arranged inside the temperature control box; the test tool is arranged inside the temperature control box and is used for fixing the measured rupture disc and forming a test cavity for pressure bearing; the gas pressurization mechanism comprises a primary gas booster pump and a secondary gas booster pump; the gas pressurization mechanism is provided with a driving gas inlet and a hydrogen inlet, which are respectively used for connecting an external driving gas supply pipeline and an external hydrogen supply pipeline; the gas buffer tank is connected to a gas path between the gas pressurization mechanism and the test tool, and is used for storing and pressure buffering the pressurized hydrogen; the safety relief structure is in communication with the test cavity of the test tool, and is used for relieving hydrogen when the measured rupture disc breaks; the arch height displacement measurement mechanism is integrated on the temperature control box, a measurement end of the arch height displacement measurement mechanism is aligned with a central region of the measured rupture disc of the test tool, and the arch height displacement measurement mechanism is used for measuring the arch height displacement change of the measured rupture disc in the pressurization process.

[0017] According to the specific embodiments provided in the present application, the following technical effects are disclosed:

[0018] The application provides a rupture disc explosion test method, system and device in a hydrogen environment, which eliminates the risk of forming an explosive mixed gas in a pipeline and a test cavity by purging the controlled test pipeline with a sweeping and blowing gas, and strictly determining the oxygen content and moisture content according to monitoring data fed back by an environment component sensor, and establishes a safe environment before hydrogen is passed; the test cavity reaches a preset temperature value by independently controlling a temperature control actuator, and hydrogen is pressurized to a preset target pressure value by controlling a gas pressurizing mechanism, so that the specific temperature and super-high pressure combined working conditions faced by the rupture disc in actual application can be accurately and independently simulated, and the authenticity of the test working conditions is ensured; the opening of a hydrogen flow adjusting mechanism is dynamically adjusted by a preset combined control algorithm, so that closed-loop control of the pressure rising rate in the test cavity is realized, and high-precision automation and repeatability of the pressurization process are realized; hydrogen concentration data fed back by a hydrogen concentration sensor are acquired in real time, and the pressure change characteristics of hydrogen pressure are synchronously analyzed, when the hydrogen concentration data exceed a preset concentration alarm threshold, or the pressure change characteristics meet a preset explosion judgment characteristic, a safety interlocking instruction is immediately executed, the hydrogen supply is automatically controlled by a gas circuit actuator to be cut off, and a safety relief channel is started by a safety relief actuator to control, real-time monitoring and early warning for unexpected sudden hydrogen leakage and rapid identification for expected explosion events are constructed, automatic safety disposal of sudden situations and normal experimental endpoints in the test process is realized, and on the premise of ensuring safety, the pressure and arch displacement change data from the start of pressurization to the explosion are synchronously acquired, which provides experimental test data for performance evaluation of the rupture disc. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0020] Figure 1 FIG. 1 is a flowchart of a rupture disc explosion test method in a hydrogen environment according to an embodiment of the present application;

[0021] Figure 2 FIG. 3 is a detailed flowchart of step 13 in FIG. 1; Figure 1

[0022] Figure 3 FIG. 5 is a detailed flowchart of step 15 in FIG. 1; Figure 1

[0023] Figure 4 FIG. 6 is a schematic diagram of a rupture disc explosion test system in a hydrogen environment according to an embodiment of the present application.

[0024] ​​In the figure: 1, temperature control box; 2, test tooling; 3, gas booster mechanism; 31, first-stage gas booster pump; 32, second-stage gas booster pump; 4, gas buffer tank; 5, cooler; 61, first ultrahigh-pressure pneumatic stop valve; 62, second ultrahigh-pressure pneumatic stop valve; 63, third ultrahigh-pressure pneumatic stop valve; 64, fourth ultrahigh-pressure pneumatic stop valve; 7, ultrahigh-pressure intelligent regulating valve; 81, first exhaust port; 82, second exhaust port; 9, arch height displacement measurement mechanism; 100, measured rupture disc; 101, computer; 102, control cabinet; 201, hydrogen source pneumatic stop valve; 202, first-stage drive gas pneumatic stop valve; 203, second-stage drive gas pneumatic stop valve. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0026] The above-mentioned purposes, features and advantages of the present application will be more apparent and understandable. The present application will be described in further detail below with reference to the drawings and specific embodiments.

[0027] In an exemplary embodiment, as shown in Figure 1 a method for testing the rupture of a rupture disc in a hydrogen environment is provided, comprising the following steps:

[0028] S11, controlling the gas path actuator to introduce sweep gas into the controlled test pipeline, and obtaining monitoring data fed back by the environmental composition sensor;

[0029] S12, when the oxygen content and moisture content in the monitoring data are respectively lower than the oxygen content threshold and the moisture content threshold, controlling the gas path actuator to switch to introducing hydrogen into the controlled test pipeline;

[0030] S13, controlling the temperature control actuator to bring the temperature of the test cavity containing the measured rupture disc to a preset temperature value; and controlling the gas booster mechanism to pressurize the hydrogen to a preset target pressure value;

[0031] S14, obtaining in real time the hydrogen pressure fed back by the pressure sensor and the arch height displacement value of the measured rupture disc fed back by the displacement sensor during the test process of supplying pressurized hydrogen to the test cavity;

[0032] S15, based on the hydrogen pressure and a preset target pressure rise rate, controlling the opening of the hydrogen flow regulating mechanism by a preset composite control algorithm, so as to close-loop control the pressure rise rate in the test cavity;

[0033] S16, real-time acquisition of hydrogen concentration data fed back by the hydrogen concentration sensor during the test process, and analysis of the pressure change characteristics of the hydrogen pressure;

[0034] S17, execution of the safety interlock instruction when the hydrogen concentration data exceeds the preset concentration alarm threshold, or when the pressure change characteristics meet the preset burst judgment characteristics.

[0035] The safety interlock instruction includes: control of the gas path execution mechanism to cut off the hydrogen supply, and control of the safety relief execution mechanism to start the safety relief passage.

[0036] The above steps 11 to 17 are implemented. By executing steps 11 and 12, the test pipeline to be controlled is purged with a sweep gas before hydrogen is introduced, and the oxygen content and moisture content are strictly judged according to the monitoring data fed back by the environmental composition sensor, and only after it is confirmed that both are lower than their respective oxygen content threshold and moisture content threshold, the gas path execution mechanism is instructed to switch to introduce hydrogen, eliminating the risk of forming an explosive mixed gas in the pipeline and test cavity, and establishing a safe environment before hydrogen is introduced. By executing step 13, the temperature control execution mechanism is independently controlled to make the test cavity reach the preset temperature value, and the gas pressurization mechanism is controlled to pressurize the hydrogen to the preset target pressure value, which can accurately and independently simulate the specific temperature and super-high pressure combined working conditions faced by the bursting disc in actual application, ensuring the authenticity of the test working conditions. By executing steps 14 and 15, the hydrogen pressure fed back by the pressure sensor is acquired in real time, and based on this pressure and the preset target pressure rise rate, the opening of the hydrogen flow regulating mechanism is dynamically adjusted through a preset combined control algorithm, thereby realizing closed-loop control of the pressure rise rate in the test cavity, achieving high-precision automation and repeatability of the pressure rise process. By executing steps 16 and 17, the hydrogen concentration data fed back by the hydrogen concentration sensor is acquired in real time, and the pressure change characteristics of the hydrogen pressure are analyzed synchronously, and when the hydrogen concentration data exceeds the preset concentration alarm threshold, or the pressure change characteristics meet the preset burst judgment characteristics, the safety interlock instruction is immediately executed, the gas path execution mechanism is automatically controlled to cut off the hydrogen supply, and the safety relief execution mechanism is controlled to start the safety relief passage. The above burst test method establishes real-time monitoring and early warning for unexpected sudden hydrogen leakage and rapid identification for expected burst events, realizes automatic and safe disposal of sudden situations and normal experimental endpoints during the test process, and simultaneously acquires the whole process pressure and arch displacement change data from the start of pressure rise to the occurrence of burst under the premise of ensuring safety, providing experimental test data for performance evaluation of the bursting disc.

[0037] In a specific implementation, in steps 11 and 12, the sweep gas can be nitrogen, the sweep gas and hydrogen use the same controlled test pipeline, when it is determined that the gas replacement is completed, it is in a state that hydrogen can be safely introduced, at this time, the nitrogen source of the sweep gas is switched to the hydrogen source; the gas path actuator includes various related electromagnetic pneumatic valve control units; the detection data includes oxygen content and moisture content. The test system can set the oxygen content threshold to 1 ppm and the moisture content threshold to 5 ppm. The control unit of the test system compares the monitoring data with the respective thresholds and makes logical judgments. Only when the monitoring data indicates that the oxygen content is stably below the oxygen content threshold and the moisture content is stably below the moisture content threshold, the control unit of the test system determines that the driving gas replacement is completed and is in a state that hydrogen can be safely introduced.

[0038] In a specific implementation, in step 13, the temperature control actuator can adjust the temperature of the test cavity containing the bursting disc, and can specifically adjust the test environment temperature between-40℃ and 120℃, so that the preset temperature value can be set according to the test requirements. Specifically, the test cavity as a whole is placed in a dedicated temperature control box, and the temperature control actuator is integrated in the temperature control box, which can include a heating unit, a refrigeration unit (such as a liquid nitrogen cooling circuit) and a circulating fan, for forced temperature adjustment and uniformity of air in the box.

[0039] In another exemplary embodiment of the present application, as shown in Figure 2 The specific steps of step 13 in which the control gas pressurization mechanism pressurizes hydrogen to a preset target pressure value include:

[0040] S131, determining whether the preset target pressure value reaches a preset pressure threshold;

[0041] S132, if the preset target pressure value is less than the preset pressure threshold, the control gas pressurization mechanism is operated in a first-stage pressurization mode, which includes: controlling the operation of the first-stage gas pressurization pump, and cooling the hydrogen output after operation;

[0042] S133, if the preset target pressure value is greater than or equal to the preset pressure threshold, the control gas pressurization mechanism is enabled in a staged pressurization mode, which includes: first controlling the operation of the first-stage gas pressurization pump, and then controlling the operation of the second-stage gas pressurization pump; wherein, after the operation of the first-stage gas pressurization pump and before the operation of the second-stage gas pressurization pump, the hydrogen is cooled.

[0043] In a specific implementation, the gas pressurizing mechanism adopts a first-stage and a second-stage gas pressurizing pump, both of which are gas-driven pressurizing pumps. The working principle is to use a low-pressure driving gas to push a piston in the pump, thereby compressing another high-pressure working medium. The working medium is 10-15 MPa bottled hydrogen, and the driving gas is nitrogen or compressed air. The connection pipeline of the driving gas and the test pipeline of the hydrogen are not the same pipeline. The pressure of the driving gas is stably controlled in the range of 0.5 MPa to 1.0 MPa through a pressure reducing valve. Due to the difference in the pressure of the driving gas, the pressure of the pressurized hydrogen also changes. The pressure of the driving gas and the pressurizing ratio of the hydrogen pressurizing pump jointly determine the final hydrogen output pressure. Specifically, by adjusting the pressure of the driving gas, the output pressure of the pressurized hydrogen can be linearly adjusted.

[0044] In a specific implementation, the preset pressure threshold can be set to 48 MPa.

[0045] When the preset target pressure value is lower than 48 MPa, a first-stage pressurizing mode is adopted. In the first-stage pressurizing mode, the first-stage gas pressurizing pump is controlled to operate. The pressure of the driving gas of the first-stage gas pressurizing pump is set to 0.8 MPa, and the pressurizing ratio is 60:1. The first-stage gas pressurizing pump can pressurize hydrogen with an inlet pressure of 10-15 MPa to an output pressure of about 48 MPa. After pressurization, the output hydrogen after operation is cooled by a cooler.

[0046] When the preset target pressure value needs to be in the range of 48 MPa to 200 MPa, a staged pressurizing mode is enabled. In the staged pressurizing mode, the first-stage gas pressurizing pump pressurizes hydrogen to about 48 MPa. A cooler between the first-stage gas pressurizing pump and the second-stage gas pressurizing pump is used to cool the hydrogen. The cooled hydrogen enters the second-stage gas pressurizing pump. The pressurizing ratio of the second-stage gas pressurizing pump is designed to be not less than 250:1. Under the working condition that the pressure of the driving gas is also set to 0.8 MPa, the two stages work in series to finally pressurize the hydrogen to a maximum of 200 MPa.

[0047] By implementing the above steps 131-133, the optimal pressurization path is first intelligently selected by judging whether the preset target pressure value reaches the preset pressure threshold. If the preset target pressure value is less than the preset pressure threshold, the gas pressurization mechanism is controlled to operate in a first-stage pressurization mode. The first-stage pressurization mode realizes preliminary pressurization of hydrogen by controlling the operation of a first-stage gas pressurization pump, and immediately cools the output hydrogen after operation to eliminate compression heat and protect the downstream system. If the preset target pressure value is greater than or equal to the preset pressure threshold, the gas pressurization mechanism is controlled to enable a more efficient staged pressurization mode. The staged pressurization mode first controls the operation of the first-stage gas pressurization pump, then cools the hydrogen to reduce the medium temperature and protect the second-stage pump, and finally controls the operation of the second-stage gas pressurization pump for final pressurization. This method realizes efficient and safe pressurization in a super-wide pressure range (such as 10 MPa to 200 MPa), and through intelligent mode switching and forced intermediate cooling, it not only avoids the efficiency bottleneck and overheating risk of a single pressurization pump at super-high pressure, but also ensures the reliability of the output hydrogen temperature, providing a stable and safety-temperature-compliant super-high-pressure hydrogen source for subsequent testing.

[0048] In another exemplary embodiment of the present application, as shown in Figure 3 In step 15, based on the hydrogen pressure and the preset target pressurization rate, the opening of the hydrogen flow regulating mechanism is controlled by a preset composite control algorithm to close-loop control the pressure rise rate in the test chamber. The specific steps include:

[0049] S151, filtering the hydrogen pressure;

[0050] S152, calculating the actual pressurization rate based on the filtered hydrogen pressure;

[0051] S153, calculating the rate error between the actual pressurization rate and the preset target pressurization rate;

[0052] S154, calculating the total control amount based on the rate error using a preset composite control algorithm;

[0053] S155, distributing the total control amount as opening control instructions for the hydrogen flow regulating mechanism and driving gas pressure regulating instructions for the gas pressurization mechanism, and outputting for execution.

[0054] In specific implementation, the data collection before filtering is continuously collected by a pressure sensor at a sampling frequency of 10 Hz to collect the hydrogen pressure in the test chamber, and then the data processing module of the test system uses a sliding average and a first-order low-pass filtering processing method to filter the hydrogen pressure to filter out high-frequency noise interference and obtain smooth and stable real-time hydrogen pressure P t ​This data is used for subsequent calculations of the actual pressure boost rate. Furthermore, simultaneous data acquisition and filtering can be employed to synchronously acquire real-time temperature data. T ( t ).

[0055] In practical implementation, after obtaining the real-time hydrogen pressure after filtering... P ( t Then, the actual pressure rise rate is calculated based on this pressure. Specifically, the formula used for the calculation is: .in, t For the current moment, This represents the actual boost rate. P ( t The value is the real-time hydrogen pressure, and Δt is the sampling period, which can be set to 2 seconds. This calculation yields the actual pressure increase rate at the current moment, expressed in MPa / min. This is used for subsequent comparison with the target boost rate and to generate a rate error. .

[0056] In practical implementation, the actual boost rate is obtained. Then, the error between it and the preset target boost rate is calculated. Specifically, the rate error... The calculation formula is: ,in, This refers to the preset target boost rate value set by the host computer. Rate error. It will serve as the core input to the preset composite control algorithm, driving subsequent proportional, integral, derivative, and feedforward compensation calculations.

[0057] In practical implementation, after obtaining the rate error Then, the total control quantity is calculated using a preset composite control algorithm. Specifically, the mathematical model of the composite control algorithm is as follows: ,in, t For the current moment, This is the total control quantity. This is the proportionality coefficient. For rate error, The integral coefficient is... These are the differential coefficients. This is the feedforward compensation amount.

[0058] Among them, the proportionality coefficient Integral coefficient and differential coefficients These coefficients are segmented according to the pressure range of the test pressure: in the low-pressure range (<48MPa), the proportional coefficient... Take 1.5~2.5 to speed up the response, integral coefficient Corresponding integral time 5~10 seconds, differential coefficient Corresponding differential time 0.5~1 seconds; in the high pressure section (48MPa~200MPa), proportional coefficient Take 0.8~1.5 to suppress overshoot, integral coefficient Corresponding integral time 10~20 seconds, differential coefficient Corresponding differential time 1~2 seconds. Further, to improve the control stability, when the absolute value of the rate error is less than ±0.5% of the target pressure rate, the proportional coefficient is automatically multiplied by a decay coefficient of 0.6~0.8. In addition, when calculating the differential item output using the differential coefficient , to avoid direct differential amplification of high-frequency noise on the error signal , a second-order difference filtering method is used to calculate the differential value. Specifically, the differential item is calculated by the following formula: Where Δt is the sampling period described above. This calculation method can effectively suppress high-frequency noise and ensure the stability and effectiveness of differential control.

[0059] For the feedforward compensation amount , the calculation formula is: Where t is the current time, T ( t ) is the real-time temperature, is the reference temperature (which can be set to 25℃), k1 is the rate compensation coefficient (value range 0.1~0.3), k2 is the pressure compensation coefficient (value range 0.05~0.1), and k3 is the temperature compensation coefficient (value range 0.02~0.05).

[0060] In the control process, the theoretical target pressure P target ( t )= P 0 + V set t Where P 0 is the initial pressure, which can be 10MPa, and the theoretical target pressure P target ( t ) is calculated for comparison with the real-time hydrogen pressure P ( t ) to monitor whether the pressure increasing process is well tracking the preset target pressure rate.

[0061] In a specific implementation, after the total control amount is calculated , it is distributed and converted into specific execution instructions. Specifically, the distribution is made according to preset weights: a large portion (weights 0.7-0.9) of the total control amount is used to generate instructions for controlling the opening degree of the hydrogen flow regulating mechanism; the remaining portion (weights 0.1-0.3) of the total control amount is used to generate instructions for regulating the driving gas pressure of the gas pressurizing mechanism, which is used to regulate the pressure of the driving gas (nitrogen or compressed air) pressurized to the super-high-pressure gas tank as the buffer gas source, and the pressure of the driving gas is controlled in the range of 0.5-1.0 MPa by the pressure reducing valve.

[0062] Subsequently, the remote control unit outputs the opening degree control instructions to the electromagnetic pneumatic valve control unit to adjust the opening degree of the super-high-pressure intelligent regulating valve, thereby controlling the hydrogen flow from the buffer gas source (super-high-pressure gas tank); at the same time, the driving gas pressure regulating instructions are output to accurately control the pressurization process of the buffer gas source by adjusting the driving force of the driving gas pressurizing pump. The hydrogen entering the test cavity is regulated by closed-loop control, and all of it comes from the buffer gas source (super-high-pressure gas tank) that has been subjected to pressure stabilization treatment.

[0063] By performing steps 151-155, the hydrogen pressure is first filtered to eliminate noise interference and obtain stable pressure data. Subsequently, the rate error is calculated, which accurately reflects the deviation of the current pressure rising process from the ideal process. Based on the rate error, a preset composite control algorithm is used for calculation to obtain the total control amount, which is intelligently distributed as opening degree control instructions for the hydrogen flow regulating mechanism and driving gas pressure regulating instructions for the gas pressurizing mechanism, and is output for execution. This series of steps builds a high-precision, fast-response pressure closed-loop control, which can sense the pressure change trend in real time, dynamically adjust the action of the key execution mechanism through the composite control algorithm, thereby ensuring that the pressure in the test cavity can rise strictly according to the preset target pressure rising rate with extremely high precision and stability, and providing a guarantee for obtaining accurate and reliable burst pressure data.

[0064] In a specific implementation, in step 16, during the test process, the hydrogen concentration data fed back by the hydrogen concentration sensing unit arranged inside the temperature control box is acquired in real time, and the hydrogen pressure fed back by the pressure sensor is analyzed to monitor its pressure change characteristics. Specifically, the analysis includes real-time monitoring of the pressure data and identifying whether the pressure has a sudden drop that meets a preset characteristic. Specifically, a pressure drop value reaching or exceeding 2 MPa is identified as a significant pressure inflection point, which is one of the physical signs that the test system determines as a possible rupture or burst of the burst disc.

[0065] In a specific implementation, in step 17 above, the real-time acquired hydrogen concentration data is compared with the preset concentration alarm threshold, and whether the pressure change characteristics meet the preset burst judgment characteristics is analyzed synchronously. Specifically, the concentration alarm threshold can be set to 4000 ppm. One key indicator of the burst judgment characteristics is that the pressure drop value reaches or exceeds 2 MPa.

[0066] When any of the following conditions is met, the control unit of the test system immediately triggers a safety interlock instruction, including:

[0067] 1. The hydrogen concentration data exceeds the concentration alarm threshold of 4000 ppm;

[0068] 2. The burst judgment characteristic that the pressure drop value reaches or exceeds 2 MPa is identified.

[0069] Once the safety interlock instruction is triggered, the control unit of the test system will perform the following actions:

[0070] 1. Control the gas path actuator to act: immediately close the hydrogen source pneumatic shut-off valve to cut off the hydrogen supply from the source, and simultaneously close the driving gas pneumatic shut-off valve to cut off the power source of the gas booster pump and stop the pressure increase;

[0071] 2. Control the safety relief actuator to act: the safety relief actuator includes opening the relief valve of the hydrogen delivery pipeline, the relief valve of the test cavity, and the relief valve of the temperature control box.

[0072] Among them, when the hydrogen concentration data exceeds the concentration alarm threshold of 4000 ppm, the relief valve of the hydrogen delivery pipeline, the relief valve of the test cavity, and the relief valve of the temperature control box are opened to discharge the hydrogen into the atmosphere outside the explosion-proof isolation plant, ensuring the safety of the test site; when the burst judgment characteristic that the pressure drop value reaches or exceeds 2 MPa is identified, only the relief valve of the hydrogen delivery pipeline and the relief valve of the test cavity are opened, realizing the automatic safety disposal of the normal experimental endpoint in the test process.

[0073] In one exemplary embodiment, a burst test system for a rupture disc in a hydrogen environment is provided, comprising: a control unit, and a gas path actuator, an environmental component sensor, a temperature control actuator, a gas booster mechanism, a pressure sensor, a hydrogen flow regulating mechanism, a hydrogen concentration sensor, and a safety relief actuator in communication connection with the control unit; wherein the control unit is configured to execute the burst test method for the rupture disc in the hydrogen environment in the above-mentioned embodiments.

[0074] Further, the test system further comprises a cooling unit connected in communication with the control unit; the control unit is further configured to: after controlling the operation of the primary gas booster pump, control the cooling unit to cool the output hydrogen; in the staged pressurization mode, after controlling the operation of the primary gas booster pump, before controlling the operation of the secondary gas booster pump, control the cooling unit to cool the hydrogen.

[0075] In one exemplary embodiment, as shown in Figure 4 A rupture disc test device in a hydrogen environment is provided, comprising: a temperature control box 1, a test tool 2, a gas booster mechanism 3, a gas buffer tank 4, a safety relief structure, and an arch height displacement measurement mechanism 9.

[0076] The temperature control box 1 constitutes a closed temperature control environment, and the test tool is arranged inside the temperature control box;

[0077] The test tool 2 is arranged inside the temperature control box 1, and is used to fix the measured rupture disc 100 and form a test cavity for pressure bearing;

[0078] The gas booster mechanism 3 comprises a primary gas booster pump 31 and a secondary gas booster pump 32; the gas booster mechanism is provided with a driving gas inlet and a hydrogen inlet, which are respectively connected to an external driving gas supply pipeline and an external hydrogen supply pipeline;

[0079] The gas buffer tank 4 is connected to the gas pipeline between the gas booster mechanism 3 and the test tool 2, and is used to store and buffer the pressurized hydrogen;

[0080] The safety relief structure is in communication with the test cavity of the test tool 2, and is used to release hydrogen when the measured rupture disc 100 breaks.

[0081] The arch height displacement measurement mechanism 9 is integrated on the temperature control box 1, and the measurement end is aligned with the center area of the measured rupture disc 100 of the test tool 2, and is used to measure the arch height displacement change of the measured rupture disc 100 during the pressurization process.

[0082] Specifically, a cooler 5 is installed on the pipeline between the primary gas booster pump 31 and the secondary gas booster pump 32, and the cooler 5 is used to forcibly cool the hydrogen whose temperature rises after primary pressurization, so as to protect the secondary pump and ensure the safety of the hydrogen medium temperature.

[0083] The gas buffer tank 4 is specifically an ultrahigh-pressure gas storage tank, the inlet of which is connected with the outlet of the secondary gas booster pump 32 through a high-pressure pipeline, the outlet of which is connected with the first ultrahigh-pressure pneumatic stop valve 61, the ultrahigh-pressure intelligent regulating valve 7 in sequence through a high-pressure pipeline, and finally connected with the test cavity of the test tool 2. A second ultrahigh-pressure pneumatic stop valve 62 is also arranged in parallel on the pipeline between the first ultrahigh-pressure pneumatic stop valve 61 and the ultrahigh-pressure intelligent regulating valve 7, the outlet of the valve is connected to an independent safety relief pipeline, and the safety relief pipeline is one of the relief outlets of the safety relief structure. During normal testing, the ultrahigh-pressure intelligent regulating valve 7 is opened, the second ultrahigh-pressure pneumatic stop valve 62 is closed, and the ultrahigh-pressure intelligent regulating valve 7 is adjusted to enter the test cavity. When emergency relief is needed, the first ultrahigh-pressure pneumatic stop valve 61 is closed and the second ultrahigh-pressure pneumatic stop valve 62 is opened, so that the high-pressure hydrogen gas in the test cavity and the upstream pipeline can be quickly discharged through the first exhaust port 81 of the safety relief pipeline; and a second exhaust port 82 is arranged on the high-pressure chamber end cover of the test cavity of the test tool 2, and the hydrogen gas in the test cavity can be discharged through the opening of the third ultrahigh-pressure pneumatic stop valve 63 on the pre-set relief pipeline; and a third exhaust port 83 is arranged on the top of the temperature control box 1, and the hydrogen gas in the temperature control box 1 can be discharged through the opening of the fourth ultrahigh-pressure pneumatic stop valve 64 on the pre-set relief pipeline.

[0084] The gas path control function of the burst test device is realized by the following controlled valves, which constitute the gas path execution mechanism:

[0085] Hydrogen source pneumatic stop valve 201: installed on the external hydrogen supply pipeline, used to control the entry and cut-off of hydrogen;

[0086] Primary drive gas pneumatic stop valve 202 and secondary drive gas pneumatic stop valve 203: respectively installed on the pipelines of the drive gas to the primary gas booster pump 31 and the secondary gas booster pump 32, used to control the power supply of the two-stage booster pump;

[0087] First ultrahigh-pressure pneumatic stop valve 61: installed on the outlet pipeline of the gas buffer tank 4, used to open or cut off the main high-pressure gas path to the test tool.

[0088] Ultrahigh-pressure intelligent regulating valve 7: installed downstream of the first ultrahigh-pressure pneumatic stop valve 61, as a hydrogen flow regulating mechanism, used to precisely regulate the hydrogen flow entering the test cavity according to the control instruction.

[0089] Second ultrahigh-pressure pneumatic stop valve 62: installed on the pipeline between the first ultrahigh-pressure pneumatic stop valve 61 and the ultrahigh-pressure intelligent regulating valve 7, the outlet of which is connected to the safety relief pipeline, and the valve is used to switch the high-pressure hydrogen in the test system to the relief pipeline for rapid discharge when the safety interlock is triggered.

[0090] Third ultra-high pressure pneumatic stop valve 63: installed on the relief pipeline of the test cavity, the valve is used to quickly discharge high-pressure hydrogen gas in the test cavity when the safety interlock is triggered;

[0091] Fourth ultra-high pressure pneumatic stop valve 64: installed on the relief pipeline at the top of the temperature control box 1, the valve is used to quickly discharge high-pressure hydrogen gas in the temperature control box 1 when the hydrogen concentration data exceeds the concentration alarm threshold.

[0092] All the above valves are connected with the control cabinet 102 through electromagnetic valves, accept its instructions and act, together perform the gas replacement, pressure control, flow regulation and safety relief function in the test process.

[0093] The temperature control function of the burst test device is realized by the temperature control actuator, which operates under the instruction of the control cabinet 102, and accurately adjusts and stabilizes the internal temperature of the temperature control box 1 to the preset temperature value through the internal heating, refrigeration and air circulation components, so as to provide the required stable temperature environment for the test tool 2 and the bursting disc 100 placed therein.

[0094] The hydrogen flow regulation function of the burst test device is realized by the ultra-high pressure intelligent regulating valve 7, which is the hydrogen flow regulating mechanism. The ultra-high pressure intelligent regulating valve 7 is connected with the control cabinet 102 through electrical lines, receives the real-time control instructions issued by the control cabinet 102, and directly regulates the hydrogen flow from the buffer gas source to the test cavity by precisely changing the valve opening degree, so as to realize the closed-loop control of the entire test pressure increasing process.

[0095] In an exemplary embodiment, a computer device is also provided, including a memory and a processor, the memory stores a computer program, and the processor implements the burst test method of the bursting disc in a hydrogen environment as described in any of the above method embodiments when executing the computer program. In actual deployment, the computer program can be loaded and run on physical hardware that implements the test method, such as the programmable controller, industrial computer in the control cabinet 102 mentioned in the implementation, or the independent computer 101.

[0096] In an exemplary embodiment, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to implement the steps in the above method embodiments.

[0097] In an exemplary embodiment, a computer program product is provided, which includes a computer program, and the computer program is executed by a processor to implement the steps in the above method embodiments.

[0098] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing relevant hardware, and the computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, the computer program can include the processes of the above-mentioned embodiment methods.

[0099] Any combination of the technical features in the above embodiments can be made, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0100] The principles and implementation manners of the present application are described by applying specific examples herein, and the above embodiment descriptions are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will have changes. In conclusion, the content of the present application should not be understood as a limitation.

Claims

1. A method of burst testing a burst disk in a hydrogen environment, performed by a testing system, the method comprising: The method comprises the following steps: controlling a gas path actuator to supply sweep gas to a controlled test pipeline and obtaining monitoring data fed back by an environmental composition sensor; when the oxygen content and the moisture content in the monitoring data are lower than the oxygen content threshold and the moisture content threshold respectively, controlling the gas path actuator to switch to supply hydrogen to the controlled test pipeline; controlling a temperature control actuator to make the temperature of a test cavity containing a measured rupture disc reach a preset temperature value; and controlling a gas pressurization actuator to pressurize the hydrogen to a preset target pressure value; obtaining, in real time, the hydrogen pressure fed back by a pressure sensor and the arch height displacement value of the measured rupture disc fed back by a displacement sensor during a test process of supplying the pressurized hydrogen to the test cavity; based on the hydrogen pressure and a preset target pressure rising rate, controlling the opening degree of a hydrogen flow regulating actuator by a preset composite control algorithm to close-loop control the pressure rising rate in the test cavity; obtaining, in real time, hydrogen concentration data fed back by a hydrogen concentration sensor during the test process and analyzing the pressure change characteristics of the hydrogen pressure; when the hydrogen concentration data exceeds a preset concentration alarm threshold or when the pressure change characteristics meet a preset rupture judgment characteristic, executing a safety interlock instruction; wherein the safety interlock instruction comprises controlling the gas path actuator to cut off the hydrogen supply and controlling a safety relief actuator to start a safety relief passage.

2. The method of burst testing a burst disk in a hydrogen environment of claim 1, wherein, The method of pressurizing the hydrogen to the preset target pressure value by the gas pressurization actuator comprises the following steps: judging whether the preset target pressure value reaches a preset pressure threshold; if the preset target pressure value is less than the preset pressure threshold, controlling the gas pressurization actuator to operate in a primary pressurization mode, which comprises controlling a primary gas pressurization pump to operate and cooling the hydrogen output after operation; if the preset target pressure value is greater than or equal to the preset pressure threshold, controlling the gas pressurization actuator to enable a hierarchical pressurization mode, which comprises controlling the primary gas pressurization pump to operate first and then controlling a secondary gas pressurization pump to operate; wherein the hydrogen is cooled after the operation of the primary gas pressurization pump and before the operation of the secondary gas pressurization pump.

3. The method of burst testing a burst disk in a hydrogen environment of claim 1, wherein, The method of controlling the opening degree of the hydrogen flow regulating actuator based on the hydrogen pressure and the preset target pressure rising rate by the preset composite control algorithm to close-loop control the pressure rising rate in the test cavity comprises the following steps: filtering the hydrogen pressure; calculating an actual pressure rising rate based on the filtered hydrogen pressure; calculating a rate error between the actual pressure rising rate and the preset target pressure rising rate; calculating a total control amount by the preset composite control algorithm based on the rate error; distributing the total control amount into an opening degree control instruction of the hydrogen flow regulating actuator and a driving gas pressure regulating instruction of the gas pressurization actuator, and outputting the execution.

4. The method of burst testing a burst disk in a hydrogen environment of claim 3, wherein, The driving gas pressure regulating instruction of the gas pressurization actuator is used to regulate the pressure of the driving gas pressurized to a buffer gas source; and the closed-loop controlled hydrogen comes from the buffer gas source.

5. The method of burst testing a burst disk in a hydrogen environment of claim 3, wherein, The formula for calculating the actual boost rate is as follows: ,in, t For the current moment, The actual boost rate, P ( t (This refers to the real-time hydrogen pressure.) Δt represents the hydrogen pressure at the previous sampling time, and Δt represents the sampling period.

6. The method of burst testing a burst disk in a hydrogen environment of claim 3, wherein, A mathematical model of the preset composite control algorithm is wherein, t is a current time, is a total control amount, is a proportional coefficient, is the rate error, is an integral coefficient, is a differential coefficient, is a feedforward compensation amount; The proportional coefficient, the integral coefficient and the differential coefficient are segmented and valued according to a pressure range in which the preset target pressure value is located.

7. The method of burst testing a burst disk in a hydrogen environment of claim 6, wherein, The mathematical model for the feedforward compensation is: ,in, t For the current moment, For the preset boost rate, P ( t (This refers to real-time pressure.) T ( t (This refers to the real-time temperature.) The reference temperature is k1, the rate compensation coefficient is k2, the pressure compensation coefficient is k3, and the temperature compensation coefficient is k3.

8. A burst test system for burst disks in a hydrogen environment, comprising: Comprise: A control unit, and a gas path execution mechanism, an environmental component sensor, a temperature control execution mechanism, a gas supercharging mechanism, a pressure sensor, a hydrogen flow adjusting mechanism, a hydrogen concentration sensor and a safety relief execution mechanism which are in communication connection with the control unit; wherein the control unit is configured to execute the burst test method of the burst disc in the hydrogen environment as claimed in any one of claims 1-7.

9. The burst test system for a burst disk in a hydrogen environment of claim 8, wherein, Further comprising a cooling unit in communication connection with the control unit; the control unit is further configured to control the cooling unit to cool the output hydrogen after controlling the operation of the primary gas supercharging pump; in the staged supercharging mode, the cooling unit is controlled to cool the hydrogen after the operation of the primary gas supercharging pump and before the operation of the secondary gas supercharging pump.

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