A compatibility evaluation method and equipment for natural gas hydrogen-doped pipes

Abstract

The present application proposes a compatibility evaluation method, device, electronic equipment and storage medium suitable for pipes in a natural gas hydrogen-doped environment, including five steps: determining the natural gas hydrogen-doped environment, high-pressure hydrogen permeation, tensile performance testing of the natural gas hydrogen-doped environment, hydrogen embrittlement sensitivity testing of the pipe, and fatigue life prediction. Taking into account the internal transmission pressure of the pipeline and the differences in the medium, different mechanical property tests are carried out on the pipes, and the compatibility of steel pipelines of different materials with hydrogen in a hydrogen transmission environment is comprehensively and systematically evaluated from different load mechanisms. The technical problems of the incomplete evaluation process of existing hydrogen-doped natural gas pipes, inconsistent test parameters, large differences in test results, and unclear evaluation indicators are solved, and method support is provided for the material selection of new natural gas hydrogen-doped pipelines and the evaluation of the transport adaptability of existing natural gas hydrogen-doped pipelines.

Description

Technical Field

[0001] The present application relates to the technical field of material testing, and in particular to a compatibility evaluation method, device, electronic equipment and storage medium suitable for pipes in a natural gas hydrogen-doped environment. Background Art

[0002] At present, a new power system with new energy as the main body is being constructed. Hydrogen energy will play an important role in the future sustainable energy system due to its clean, efficient and renewable characteristics. The storage and transportation of hydrogen is one of the key factors in the development of hydrogen energy, which restricts the rapid development of hydrogen energy. Compared with other methods of hydrogen transportation, pipeline hydrogen transportation has incomparable advantages. Pipeline natural gas hydrogen transportation is currently the best way to achieve large-scale hydrogen transportation. As a result, the risk of hydrogen embrittlement faced by hydrogen-blended pipelines increases, resulting in deterioration of mechanical properties and even fracture. The safety issues caused by this are currently the focus of attention at home and abroad. The compatibility of natural gas hydrogen-blended transportation environment pipes and hydrogen is an important basis for ensuring the inherent safety of pipeline materials. It is necessary to carry out experimental research before the production and operation of hydrogen-blended pipelines to evaluate the applicability and safety of pipes in the process of pipeline hydrogen-blended transportation.

[0003] The invention "A device and method for testing hydrogen embrittlement of pipeline steel in a natural gas hydrogen-doped environment" (application publication number: CN116223227A) discloses a device and method for testing hydrogen embrittlement of pipeline steel in a natural gas hydrogen-doped environment. It includes a gas mixing mechanism and a stress loading mechanism. The gas mixing mechanism provides mixed high-pressure natural gas hydrogen-doped gas to the stress loading mechanism. The stress loading mechanism applies tension to the specimen and records the stretching distance to judge the specimen shape, and finally obtains a stress-strain curve by tensile testing in a hydrogen-doped environment. The invention "A method for evaluating the applicability of metal materials in natural gas hydrogen-doped pipelines" (application publication number: CN116298169 A) sets a division point based on the critical yield margin coefficient and the critical hydrogen embrittlement sensitivity coefficient according to the yield margin coefficient YMC of pipelines, equipment or parts in the service process of natural gas hydrogen-doped environment and the hydrogen embrittlement sensitivity coefficient RHPS of metal materials, and preliminarily divides metal materials into three types: available, unavailable and conditionally usable based on the division point.

[0004] However, the hydrogen embrittlement sensitivity tests of the above two methods are based on slow strain rate tensile test. According to literature reports and previous experience, the slow strain rate tensile test data is greatly affected by the sample type, sample processing size, and test parameters. Evaluating the hydrogen embrittlement sensitivity of the pipe from the slow strain rate tensile test results alone cannot fully reflect the mechanical performance of the pipe in a hydrogen-doped environment. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0006] To this end, the first purpose of this application is to propose a compatibility evaluation method for pipes suitable for natural gas hydrogen-blended environments, which can test the mechanical properties and hydrogen embrittlement sensitivity of pipes from different load action mechanisms, and provide methodological support for the material selection of newly built natural gas hydrogen-blended pipelines and the evaluation of the adaptability of existing natural gas pipelines for hydrogen-blended transportation.

[0007] The second objective of the present application is to provide a compatibility evaluation device suitable for pipes in a natural gas hydrogen-doped environment.

[0008] The third objective of the present application is to provide an electronic device.

[0009] A fourth objective of the present application is to provide a computer-readable storage medium.

[0010] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a compatibility evaluation method for pipes suitable for natural gas hydrogen-doped environments, comprising:

[0011] Determine the operating condition parameters of the natural gas hydrogen-blended pipeline pipe to be tested as the simulation test environment parameters for the performance test and evaluation of the natural gas hydrogen-blended pipeline pipe to be tested;

[0012] Based on the operating condition parameters, the gas phase hydrogen permeation and hydrogen content test of the natural gas hydrogen-blended pipeline pipe to be tested is carried out to determine the pre-hydrogen filling time;

[0013] Based on the operating condition parameters, the natural gas hydrogen-blended pipeline pipe to be tested is subjected to a natural gas hydrogen-blended environment tensile performance test to determine the mechanical performance indicators of the natural gas hydrogen-blended pipeline pipe to be tested;

[0014] Based on the operating condition parameters, the hydrogen embrittlement sensitivity test of the natural gas hydrogen-blended pipeline pipe to be tested is carried out in the natural gas hydrogen-blended environment to determine the toughness zone area in the hydrogen-blended natural gas environment, so as to evaluate the hydrogen embrittlement sensitivity of the natural gas hydrogen-blended pipeline pipe to be tested;

[0015] Based on the Paris formula, the fatigue life of the natural gas hydrogen-blended pipeline is predicted.

[0016] Among them, in determining the operating condition parameters of the natural gas hydrogen-blended pipeline pipe to be tested, the parameter types of the operating condition parameters at least include: total transmission pressure, hydrogen blending ratio, impurity component content and water dew point; wherein the natural gas is replaced by inert gas.

[0017] Among them, based on the operating condition parameters, the gas phase hydrogen permeation and hydrogen content test is carried out on the natural gas hydrogen-blended pipeline pipe to be tested, and the pre-hydrogen filling time is determined, including:

[0018] Processing the natural gas hydrogen-blended pipeline pipe to be tested into thin sheet samples of preset sizes;

[0019] The gas phase hydrogen permeation test is carried out in an autoclave, in which the natural gas hydrogen-blended pipeline pipe sample to be tested is exposed to the operating conditions corresponding to the operating condition parameters for a preset time;

[0020] After the exposure, the thermal desorption (TDS) method was used to test the hydrogen content in the natural gas hydrogen-blended pipeline pipe sample to be tested;

[0021] As the gas phase hydrogen charging time increases, the hydrogen content no longer increases, and the corresponding gas phase hydrogen charging time is the stable time, which is used as the test pre-hydrogen charging time.

[0022] Among them, based on the operating condition parameters, the natural gas hydrogen-blended pipeline pipe to be tested is subjected to a natural gas hydrogen-blended environment tensile performance test to determine the mechanical performance indicators of the natural gas hydrogen-blended pipeline pipe to be tested, including:

[0023] Process the natural gas hydrogen-blended pipeline pipe to be tested into a rod-shaped or plate-shaped tensile specimen, and fix the specimen in a closed autoclave;

[0024] Under the simulated test environmental parameter conditions, the test pre-charging hydrogen treatment is carried out according to the pre-charging hydrogen time determined by high-pressure hydrogen penetration;

[0025] Performing a tensile performance test on the sample to obtain sample performance parameters of the sample material; wherein the sample performance parameters at least include tensile strength, yield strength, section shrinkage and elongation after fracture parameters;

[0026] The sample performance parameters of the sample material are compared with the PSL2 pipe performance requirements. If the PSL2 mechanical performance indicators are met, a hydrogen embrittlement sensitivity test is carried out. If not, the pipe is unusable.

[0027] Among them, the hydrogen embrittlement sensitivity test of natural gas hydrogen-doped pipes includes slow strain rate tensile and fracture toughness tests;

[0028] The slow strain rate tensile test was carried out using notched specimens in an inert gas environment and a natural gas hydrogen-doped environment.

[0029] Before the slow strain rate tensile test in the natural gas hydrogen-doped environment, the pre-hydrogenation treatment is carried out under the simulated test environment parameter conditions according to the pre-hydrogenation time determined by high-pressure hydrogen penetration;

[0030] After the pre-charging is completed, the first tensile rate is set to perform an in-situ slow tensile test to obtain the notched tensile strength of the notched specimen in an inert gas environment and a hydrogen-doped natural gas environment;

[0031] Scanning electron microscope analysis was performed on the fracture surface of the notched specimen in the hydrogen-doped natural gas environment to determine the toughness zone area in the hydrogen-doped natural gas environment and evaluate the hydrogen embrittlement sensitivity of the natural gas hydrogen-doped pipeline pipe to be tested;

[0032] The hydrogen embrittlement sensitivity analysis of notched tensile test is to compare and analyze the change rate of tensile strength and toughness area of ​​notched specimens in inert environment and hydrogen-filled environment;

[0033] Based on the change rate of tensile strength and toughness area of ​​the notched specimen in an inert environment and a hydrogen-filled environment, if both meet the requirement of no obvious brittleness index, subsequent tests are carried out, otherwise the sample pipe is unusable.

[0034] In the fracture toughness test, the sample thickness is selected to be more than 85% of the thickness of the natural gas hydrogen-blended pipeline to be tested;

[0035] Before the test, under the simulated test environment parameter conditions, the test pre-charging hydrogen treatment is carried out according to the pre-charging hydrogen time determined by high-pressure hydrogen penetration;

[0036] Set the second tensile rate to perform in-situ fracture toughness test to obtain the fracture toughness characteristic value CTOD and fracture toughness condition value K of the sample IH ;

[0037] If the fracture toughness characteristic value CTOD is greater than or equal to the preset fracture toughness characteristic value threshold, and the fracture toughness condition value K IH Greater than or equal to the preset fracture toughness condition value K IH When the threshold is reached, subsequent tests are carried out, otherwise the sample pipe is unusable.

[0038] Among them, based on the Paris formula, the fatigue life prediction of the natural gas hydrogen-blended pipeline pipe to be tested is carried out, including:

[0039] Based on the Paris formula, the fatigue crack growth curve of the natural gas hydrogen-blended pipeline to be tested is determined;

[0040] Based on the fatigue crack growth curve of the natural gas hydrogen-blended pipeline pipe to be tested, determine the load fluctuation range of the natural gas hydrogen-blended pipeline pipe to be tested;

[0041] Combined with pipeline load fluctuations, the pipeline life is predicted. If the pipeline design life requirements are met, the material is usable and the evaluation is complete.

[0042] If the pipeline design life requirements are not met, the fatigue life test shall be repeated by reducing the pipeline operating load and hydrogen blending ratio until the pipeline service conditions are met;

[0043] If the pipeline design cannot reduce the operating load and hydrogen blending ratio, the pipe cannot be used.

[0044] To achieve the above-mentioned purpose, the second embodiment of the present application proposes a compatibility evaluation device suitable for natural gas hydrogen-doped environment pipes, comprising:

[0045] The parameter acquisition module is used to determine the operating condition parameters of the natural gas hydrogen-blended pipeline pipe to be tested, which are used as the simulation test environment parameters for the performance test and evaluation of the natural gas hydrogen-blended pipeline pipe to be tested;

[0046] High-pressure hydrogen permeation test module, used to perform gas-phase hydrogen permeation and hydrogen content tests on the natural gas hydrogen-blended pipeline pipes to be tested based on operating condition parameters, and determine the pre-hydrogen filling time;

[0047] The natural gas hydrogen-doped environment tensile performance test module is used to perform a natural gas hydrogen-doped environment tensile performance test on the natural gas hydrogen-doped pipeline pipe to be tested based on the operating condition parameters, and determine the mechanical performance indicators of the natural gas hydrogen-doped pipeline pipe to be tested;

[0048] The hydrogen embrittlement sensitivity test module for natural gas hydrogen-doped pipes is used to test the hydrogen embrittlement sensitivity of natural gas hydrogen-doped pipes based on the operating condition parameters, determine the toughness zone area under the hydrogen-doped natural gas environment, and evaluate the hydrogen embrittlement sensitivity of the natural gas hydrogen-doped pipes.

[0049] The fatigue life prediction module is used to predict the fatigue life of the natural gas hydrogen-blended pipeline pipe to be tested based on the Paris formula.

[0050] To achieve the above-mentioned purpose, the third aspect of the present application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0051] Memory stores computer-executable instructions;

[0052] The processor executes the computer-executable instructions stored in the memory to implement the method of the aforementioned technical solution.

[0053] To achieve the above-mentioned purpose, the fourth aspect embodiment of the present application proposes a computer-readable storage medium, in which computer execution instructions are stored. When the computer execution instructions are executed by a processor, they are used to implement the method as the aforementioned technical solution.

[0054] The present application provides a compatibility evaluation method, device, electronic equipment and storage medium suitable for pipes in a natural gas hydrogen-doped environment, including five steps: determining the natural gas hydrogen-doped environment, high-pressure hydrogen permeation, tensile performance testing of the natural gas hydrogen-doped environment, hydrogen embrittlement sensitivity testing of the pipe, and fatigue life prediction. The method comprehensively considers the internal transmission pressure of the pipeline and the differences in the medium, conducts different mechanical property tests on the pipe, and comprehensively and systematically evaluates the compatibility of steel pipelines of different materials with hydrogen in a hydrogen transmission environment from different load mechanisms. The method solves the technical problems of incomplete evaluation process, inconsistent test parameters, large differences in test results, and unclear evaluation indicators of existing hydrogen-doped natural gas pipes, and provides method support for material selection for newly built natural gas hydrogen-doped pipelines and evaluation of the transport adaptability of existing natural gas hydrogen-doped pipelines.

[0055] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0057] Figure 1 A schematic flow chart of a compatibility evaluation method for pipes in a natural gas hydrogen-doped environment provided in an embodiment of the present application;

[0058] Figure 2 A logical schematic diagram of a compatibility evaluation method for pipes in a natural gas hydrogen-doped environment provided in an embodiment of the present application;

[0059] Figure 3 A schematic diagram of the structure of a compatibility evaluation device for pipes in a natural gas hydrogen-doped environment provided in an embodiment of the present application. DETAILED DESCRIPTION

[0060] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0061] The following describes a compatibility evaluation method and device for pipes in a natural gas hydrogen-doped environment according to an embodiment of the present application with reference to the accompanying drawings.

[0062] Figure 1 A schematic flow chart of a compatibility evaluation method for pipes in a natural gas hydrogen-doped environment provided in an embodiment of the present application. Figure 2 A logical schematic diagram of a compatibility evaluation method for pipes in a natural gas hydrogen-doped environment provided in an embodiment of the present application.

[0063] The main test and research methods for hydrogen embrittlement sensitivity of steel materials include mechanical property tests such as slow strain rate tensile test, fracture toughness test, fatigue crack growth rate test, etc. By comparing the test results in hydrogen-containing environment and non-hydrogen environment, the resistance of the material to hydrogen embrittlement can be understood. In the past, tests on pipe compatibility either selected one hydrogen embrittlement sensitivity test method or selected several of them. Depending on the test method and sample form used, the indicators used for pipe hydrogen compatibility assessment are also different. Although relevant standards have been formed for material hydrogen embrittlement performance evaluation test methods at home and abroad, due to the small number of in-situ material performance test platforms under high-pressure hydrogen environments at home and abroad, and the relative lack of data on the degradation law of mechanical properties of pipes in hydrogen-containing gases, the key indicators for evaluating the compatibility of pipeline steel with hydrogen have not yet been unified. And due to the inconsistency of test parameters such as pre-hydrogen charging time and tensile rate during the test, the test results vary greatly.

[0064] To address this problem, the present application provides a compatibility evaluation method for pipes in a natural gas hydrogen-doped environment, such as Figure 1 As shown, the method comprises the following steps:

[0065] Step 101, determining the operating condition parameters of the natural gas hydrogen-blended pipeline pipe to be tested, which are used as the simulation test environment parameters for the performance test and evaluation of the natural gas hydrogen-blended pipeline pipe to be tested.

[0066] In the embodiment of the present invention, the parameter types of the operating condition parameters involved include at least: total transmission pressure, hydrogen blending ratio, impurity component content and water dew point; wherein the natural gas is replaced by inert gas.

[0067] Step S102: Based on the operating condition parameters, gas phase hydrogen permeation and hydrogen content tests are performed on the natural gas hydrogen-blended pipeline pipe to be tested to determine the pre-hydrogen charging time.

[0068] In the embodiments of the present invention, high pressure hydrogen permeation refers to gas phase hydrogen permeation and hydrogen content testing of the test pipe. Specifically, it includes:

[0069] The pipe material of the natural gas hydrogen-blended pipeline to be tested is processed into a thin sheet sample of a preset size; in the embodiment of the present invention, the thin sheet sample is processed into a thin sheet with a size of 20 mm×10 mm×3 mm.

[0070] The gas phase hydrogen permeation test is carried out in an autoclave, in which the natural gas hydrogen-blended pipeline pipe sample to be tested is exposed to the operating conditions corresponding to the operating condition parameters for a preset time; the preset time can be 12h, 24h, 48h, or 72h.

[0071] After the exposure, the thermal desorption (TDS) method is used to test the hydrogen content in the natural gas hydrogen-blended pipeline pipe sample to be tested; if the TDS test cannot be performed immediately, the sample needs to be stored in liquid nitrogen.

[0072] The specific method of TDS test is to put the sample into the test chamber and slowly increase the temperature to 800 degrees at a certain heating rate to test the hydrogen content overflowing from the sample.

[0073] As the gas phase hydrogen charging time increases, the hydrogen content no longer increases, and the corresponding gas phase hydrogen charging time is the stable time, which is used as the test pre-hydrogen charging time.

[0074] Step S103: Based on the operating condition parameters, a natural gas hydrogen-doped pipeline pipe material is subjected to a natural gas hydrogen-doped environment tensile performance test to determine the mechanical performance index of the natural gas hydrogen-doped pipeline pipe material to be tested.

[0075] In the embodiment of the present invention, the tensile property test of natural gas in a hydrogen-doped environment is conducted in accordance with GB / T228-2010 "Tensile test of metallic materials Part 1: Room temperature test method".

[0076] According to the above standards, the natural gas hydrogen-blended pipeline pipe to be tested is processed into a rod-shaped or plate-shaped tensile specimen, and the specimen is fixed in a closed autoclave.

[0077] Under the simulated test environmental parameter conditions, the test pre-charging hydrogen treatment is carried out according to the pre-charging hydrogen time determined by high-pressure hydrogen penetration;

[0078] After the hydrogen charging is completed, the tensile performance test of the sample is carried out according to the above standards to obtain the sample performance parameters of the sample material; wherein the sample performance parameters at least include tensile strength, yield strength, section shrinkage and elongation after fracture parameters;

[0079] The sample performance parameters of the sample material are compared with the PSL2 pipe performance requirements in GB / T 9711-2017 "Steel Pipes for Pipeline Transportation Systems in the Petroleum and Natural Gas Industry". If the PSL2 mechanical performance indicators are met, a hydrogen embrittlement sensitivity test is carried out. If not, the pipe is unusable.

[0080] Step S104: Based on the operating condition parameters, a hydrogen embrittlement sensitivity test is performed on the natural gas hydrogen-doped pipeline pipe to be tested in a natural gas hydrogen-doped environment to determine the toughness zone area in the hydrogen-doped natural gas environment to evaluate the hydrogen embrittlement sensitivity of the natural gas hydrogen-doped pipeline pipe to be tested.

[0081] In an embodiment of the present invention, the hydrogen embrittlement sensitivity test of the pipe in a natural gas hydrogen-doped environment includes slow strain rate tensile and fracture toughness tests.

[0082] The slow strain rate tensile test uses notched specimens. The specimen processing dimensions and test process refer to GB / T34542.2-2018 "Hydrogen Storage and Transportation System Part 2: Test Method for Compatibility of Metallic Materials with Compressed Hydrogen Environments". Slow strain rate tensile tests are carried out in an inert gas environment and a natural gas hydrogen-doped environment. An inert environment refers to an environment where the material is not sensitive to hydrogen embrittlement, usually including air environment, nitrogen environment, helium environment, etc.

[0083] Before the slow strain rate tensile test in the natural gas hydrogen-doped environment, the pre-hydrogenation treatment is carried out under the simulated test environment parameter conditions according to the pre-hydrogenation time determined by high-pressure hydrogen penetration;

[0084] After the pre-charging is completed, the first tensile rate is set to perform an in-situ slow tensile test to obtain the notched tensile strength of the notched sample in an inert gas environment and a hydrogen-doped natural gas environment. In this embodiment, the first tensile rate is set to 2×10 -6 s -1 .

[0085] The notched specimens in the hydrogen-doped natural gas environment were subjected to scanning electron microscopy analysis to determine the toughness zone area in the hydrogen-doped natural gas environment and to evaluate the hydrogen embrittlement sensitivity of the natural gas hydrogen-doped pipeline to be tested; the toughness zone area refers to the dimple morphology area of ​​the fracture.

[0086] The hydrogen embrittlement sensitivity analysis of notched tensile test is to compare and analyze the change rate of tensile strength and toughness area of ​​notched specimens in inert environment and hydrogen-filled environment;

[0087] Based on the change rate of tensile strength and toughness area of ​​the notched specimen in an inert environment and a hydrogen-filled environment, if both meet the requirement of no obvious brittleness index, subsequent tests are carried out, otherwise the sample pipe is unusable.

[0088] Specifically, the hydrogen embrittlement sensitivity coefficient of the notched specimen calculated based on the change in tensile strength is expressed as formula (1), and the hydrogen embrittlement sensitivity coefficient of the material calculated based on the proportion of the toughness zone area is expressed as formula (2).

[0089]

[0090]

[0091] Among them, R mk is the notched tensile strength under inert conditions, R mH is the notch tensile strength in hydrogen-filled environment, ψ Rm If it is greater than or equal to 0.87, there is no obvious brittleness. Rm Less than 0.87 indicates severe brittleness.

[0092] A is the fracture area of ​​the notched tensile specimen in the hydrogen-doped natural gas environment, A Dis the area of ​​the toughness zone of the notched tensile fracture surface of the hydrogen-doped natural gas environment specimen, ψ A If it is greater than or equal to 0.75, there is no obvious brittleness. A If it is less than 0.75, the brittleness is obvious.

[0093] ψ Rm and ψ A If and meet the requirements of no obvious brittleness index, subsequent testing can be carried out, otherwise the pipe cannot be used.

[0094] The fracture toughness test refers to the characteristic value test method in GB / T 21143-2014 "Uniform test method for quasi-static fracture toughness of metallic materials".

[0095] In the fracture toughness test, the sample thickness is selected to be more than 85% of the thickness of the natural gas hydrogen-blended pipeline to be tested;

[0096] Before the test, under the simulated test environment parameter conditions, the test pre-charging hydrogen treatment is carried out according to the pre-charging hydrogen time determined by high-pressure hydrogen penetration;

[0097] Set the second tensile rate to perform in-situ fracture toughness test to obtain the fracture toughness characteristic value CTOD and fracture toughness condition value K of the sample IH ;

[0098] If the fracture toughness characteristic value CTOD is greater than or equal to the preset fracture toughness characteristic value threshold, and the fracture toughness condition value K IH Greater than or equal to the preset fracture toughness condition value K IH When the threshold is reached, subsequent tests are carried out, otherwise the sample pipe is unusable.

[0099] Specifically, the pipe needs to be pre-charged with hydrogen in the above manner before the test, and then the in-situ fracture toughness test is performed. The second tensile rate is 0.012 mm / min, and the fracture toughness characteristic value CTOD and the fracture toughness condition value K of the pipe are obtained. IH . The CTOD value must be greater than or equal to 0.254mm and K IH Greater than or equal to 55MPa·m 1 / 2 When the pipe is used, subsequent testing can be carried out, otherwise the pipe cannot be used.

[0100] Step S105: Based on the Paris formula, fatigue life prediction is performed on the pipe material of the natural gas hydrogen-blended pipeline to be tested.

[0101] In an embodiment of the present invention, fatigue life prediction includes the following steps:

[0102] Based on the Paris formula, the fatigue crack growth curve of the natural gas hydrogen-blended pipeline to be tested is determined; it is expressed by the following formula (3):

[0103]

[0104] The parameters C and m in the formula are material constants related to the test conditions. a is the crack length, da represents the change in the crack, N is the number of cycles, and dN corresponds to the number of cycles within the crack extension range of da.

[0105] Based on the fatigue crack growth curve of the natural gas hydrogen-blended pipeline pipe to be tested, determine the load fluctuation range of the natural gas hydrogen-blended pipeline pipe to be tested;

[0106] According to the fatigue crack growth curve, the parameters C and m are fitted, and then the cycle number is calculated according to formulas (4) and (5).

[0107]

[0108]

[0109] In formula (4), △σ is the load fluctuation range determined according to the actual load spectrum, a0 is the starting fatigue crack size in formula (5), and a c is the crack instability extension size.

[0110] Combined with pipeline load fluctuations, the pipeline life is predicted. If the pipeline design life requirements are met, the material is usable and the evaluation is complete.

[0111] Combined with pipeline load fluctuations, the pipeline life is predicted. If the pipeline design life requirements are met, the material is usable and the evaluation is completed. If the pipeline design life requirements are not met, the fatigue life test can be re-performed by reducing the pipeline operating load and hydrogen blending ratio until the pipeline service conditions are met. If the pipeline design cannot reduce the operating load and hydrogen blending ratio, the pipe material is unusable.

[0112] If the pipeline design life requirements are not met, the fatigue life test shall be repeated by reducing the pipeline operating load and hydrogen blending ratio until the pipeline service conditions are met;

[0113] If the pipeline design cannot reduce the operating load and hydrogen blending ratio, the pipe cannot be used.

[0114] In order to implement the above-mentioned embodiment, the present application also proposes a compatibility evaluation device suitable for pipes in a natural gas hydrogen-doped environment.

[0115] Figure 3 A schematic diagram of the structure of a compatibility evaluation device suitable for pipes in a natural gas hydrogen-doped environment provided in an embodiment of the present application.

[0116] like Figure 3 As shown, the device 300 includes:

[0117] The parameter acquisition module 310 is used to determine the operating condition parameters of the natural gas hydrogen-blended pipeline pipe to be tested, which are used as the simulation test environment parameters for the performance test and evaluation of the natural gas hydrogen-blended pipeline pipe to be tested;

[0118] The high-pressure hydrogen permeation test module 320 is used to perform gas-phase hydrogen permeation and hydrogen content tests on the natural gas hydrogen-blended pipeline pipe to be tested based on the operating condition parameters, and determine the pre-hydrogen filling time;

[0119] The natural gas hydrogen-doped environment tensile performance test module 330 is used to perform a natural gas hydrogen-doped environment tensile performance test on the natural gas hydrogen-doped pipeline pipe to be tested based on the operating condition parameters, and determine the mechanical performance index of the natural gas hydrogen-doped pipeline pipe to be tested;

[0120] The hydrogen embrittlement sensitivity test module 340 for natural gas hydrogen-doped pipes is used to perform hydrogen embrittlement sensitivity test on the natural gas hydrogen-doped pipes to be tested based on the operating condition parameters, and determine the toughness zone area under the hydrogen-doped natural gas environment to evaluate the hydrogen embrittlement sensitivity of the natural gas hydrogen-doped pipes to be tested;

[0121] The fatigue life prediction module 350 is used to predict the fatigue life of the pipe material of the natural gas hydrogen-blended pipeline to be tested based on the Paris formula.

[0122] It should be noted that the above explanation of the embodiment of the compatibility evaluation method for pipes in a natural gas hydrogen-doped environment is also applicable to the compatibility evaluation device for pipes in a natural gas hydrogen-doped environment of this embodiment, and will not be repeated here.

[0123] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0124] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0125] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0126] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0127] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0128] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0129] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0130] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0131] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0132] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0133] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0134] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0135] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0136] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A compatibility evaluation method for pipes in a natural gas hydrogen-doped environment, characterized in that: include: Determine the operating condition parameters of the natural gas hydrogen-blended pipeline pipe to be tested as the simulation test environment parameters for the performance test and evaluation of the natural gas hydrogen-blended pipeline pipe to be tested; Based on the operating condition parameters, gas phase hydrogen permeation and hydrogen content tests are performed on the natural gas hydrogen-blended pipeline pipe to be tested to determine the pre-hydrogen filling time; Based on the operating condition parameters, a natural gas hydrogen-doped pipeline pipe to be tested is subjected to a natural gas hydrogen-doped environment tensile performance test to determine the mechanical performance index of the natural gas hydrogen-doped pipeline pipe to be tested, and the sample performance parameters of the pipe are compared with the PSL2 pipe performance requirements. If the PSL2 mechanical performance index is met, a hydrogen embrittlement sensitivity test is carried out; if not, the pipe is unusable; Based on the operating condition parameters, the hydrogen embrittlement sensitivity test of the natural gas hydrogen-blended pipeline pipe to be tested is carried out in a natural gas hydrogen-blended environment to determine the toughness zone area in a hydrogen-blended natural gas environment to evaluate the hydrogen embrittlement sensitivity of the natural gas hydrogen-blended pipeline pipe to be tested. If the requirement of no obvious brittleness index is met, subsequent testing is carried out, otherwise the pipe is unusable; The natural gas hydrogen blending environment is to conduct a test pre-hydrogenation treatment under the simulated test environment parameter conditions according to the pre-hydrogenation time determined by high-pressure hydrogen permeation; The fatigue crack growth curve of the natural gas hydrogen-blended pipeline pipe to be tested is determined based on the Paris formula. The load fluctuation range of the natural gas hydrogen-blended pipeline pipe to be tested is determined based on the fatigue crack growth curve. The pipeline life is predicted in combination with the load fluctuation range. Specifically, parameters C and m are fitted according to the fatigue crack growth curve. Parameters C and m are material constants related to the test conditions. Then, the number of cycles N is calculated according to formulas (4) and (5). （4） （5） In formula (4), is the load fluctuation range determined according to the actual load spectrum. In formula (5), is the initial fatigue crack size, is the crack instability extension size, is the crack length; If the pipeline design life requirements are not met, the pipeline operating load and hydrogen blending ratio should be reduced and the fatigue life test should be repeated until the pipeline service conditions are met.

2. The compatibility evaluation method for pipes suitable for natural gas hydrogen blending environment according to claim 1, characterized in that: In determining the operating condition parameters of the natural gas hydrogen-blended pipeline pipe to be tested, the parameter types of the operating condition parameters include at least: total transmission pressure, hydrogen blending ratio, impurity component content and water dew point; wherein the natural gas is replaced by inert gas.

3. The compatibility evaluation method for pipes suitable for natural gas hydrogen blending environment according to claim 2, characterized in that: The method of performing gas phase hydrogen permeation and hydrogen content testing on the natural gas hydrogen-blended pipeline pipe to be tested based on the operating condition parameters to determine the pre-hydrogen charging time includes: Processing the natural gas hydrogen-blended pipeline pipe to be tested into a thin sheet sample of a preset size; The gas phase hydrogen permeation test is carried out in an autoclave, in which the natural gas hydrogen-blended pipeline pipe sample to be tested is exposed to the operating conditions corresponding to the operating condition parameters for a preset time; After the exposure, the hydrogen content in the natural gas hydrogen-blended pipeline pipe sample to be tested is tested by a thermal desorption method; As the gas phase hydrogen charging time increases, the hydrogen content no longer increases, and the corresponding gas phase hydrogen charging time is the stable time, which is used as the test pre-hydrogen charging time.

4. The compatibility evaluation method for pipes suitable for natural gas hydrogen blending environment according to claim 3 is characterized in that: Based on the operating condition parameters, the natural gas hydrogen-blended pipeline pipe to be tested is subjected to a natural gas hydrogen-blended environment tensile performance test to determine the mechanical performance index of the natural gas hydrogen-blended pipeline pipe to be tested, including: Processing the natural gas hydrogen-blended pipeline pipe to be tested into a rod-shaped or plate-shaped tensile specimen, and fixing the specimen in a closed autoclave; Under the simulated test environmental parameter conditions, a test pre-charging hydrogen treatment is performed according to the pre-charging hydrogen time determined by high-pressure hydrogen penetration; Performing a tensile performance test on the sample to obtain sample performance parameters of the sample material; wherein the sample performance parameters at least include tensile strength, yield strength, section shrinkage and elongation after fracture parameters; The sample performance parameters of the sample material are compared with the PSL2 pipe performance requirements. If the PSL2 mechanical performance indicators are met, a hydrogen embrittlement sensitivity test is carried out. If not, the pipe is unusable.

5. The compatibility evaluation method for pipes suitable for natural gas hydrogen blending environment according to claim 4, characterized in that: The hydrogen embrittlement sensitivity test of natural gas hydrogen-doped environment pipes includes slow strain rate tensile and fracture toughness tests; wherein, The slow strain rate tensile test uses a notched specimen and is carried out in an inert gas environment and a natural gas hydrogen-doped environment respectively; Before the slow strain rate tensile test in the natural gas hydrogen-doped environment, the test pre-hydrogenation treatment is carried out according to the pre-hydrogenation time determined by the high-pressure hydrogen permeation under the simulated test environment parameter conditions; After the pre-charging of hydrogen is completed, a first tensile rate is set to perform an in-situ slow tensile test to obtain the notched tensile strength of the notched sample in an inert gas environment and a hydrogen-doped natural gas environment, respectively; Perform scanning electron microscope analysis on the fracture of the notched sample in the hydrogen-doped natural gas environment to determine the toughness zone area in the hydrogen-doped natural gas environment and evaluate the hydrogen embrittlement sensitivity of the natural gas hydrogen-doped pipeline pipe to be tested; The hydrogen embrittlement sensitivity analysis of the notch tensile test is to compare and analyze the change rate of the tensile strength and toughness area of ​​the notch specimen in an inert environment and a hydrogen-filled environment; Based on the tensile strength and toughness area change rate of the notched specimen in an inert environment and a hydrogen-filled environment, if both meet the requirement of no obvious brittleness index, subsequent tests are carried out, otherwise the sample pipe is unusable.

6. The compatibility evaluation method for pipes suitable for natural gas hydrogen blending environment according to claim 5, characterized in that: In the fracture toughness test, the sample thickness is selected to be more than 85% of the thickness of the natural gas hydrogen-blended pipeline pipe to be tested; Before the test, under the simulated test environmental parameter conditions, the test pre-charging hydrogen treatment is carried out according to the pre-charging hydrogen time determined by high-pressure hydrogen penetration; The second tensile rate is set to perform an in-situ fracture toughness test to obtain the fracture toughness characteristic value CTOD and the fracture toughness condition value K of the sample. IH ; If the fracture toughness characteristic value CTOD is greater than or equal to the preset fracture toughness characteristic value threshold, and the fracture toughness condition value K IH Greater than or equal to the preset fracture toughness condition value K IH When the threshold is reached, subsequent tests are carried out, otherwise the sample pipe is unusable.

7. The compatibility evaluation method for pipes suitable for natural gas hydrogen blending environment according to claim 1, characterized in that: The pipeline life prediction based on the load fluctuation range also includes: Based on the Paris formula, if the pipeline design life requirements are met, the material is usable and the evaluation is complete; If the pipeline design cannot reduce the operating load and hydrogen blending ratio, the pipe cannot be used.

8. A compatibility evaluation device for natural gas hydrogen-doped pipes, characterized in that: include: The parameter acquisition module is used to determine the operating condition parameters of the natural gas hydrogen-blended pipeline pipe to be tested, which are used as the simulation test environment parameters for the performance test and evaluation of the natural gas hydrogen-blended pipeline pipe to be tested; A high-pressure hydrogen permeation test module, used to perform gas-phase hydrogen permeation and hydrogen content tests on the natural gas hydrogen-blended pipeline pipe to be tested based on the operating condition parameters, and determine the pre-hydrogen filling time; A natural gas hydrogen-doped environment tensile performance test module is used to perform a natural gas hydrogen-doped environment tensile performance test on the natural gas hydrogen-doped pipeline pipe to be tested based on the operating condition parameters, determine the mechanical performance index of the natural gas hydrogen-doped pipeline pipe to be tested, and compare the sample performance parameters of the pipe with the PSL2 pipe performance requirements. If the PSL2 mechanical performance index is met, a hydrogen embrittlement sensitivity test is carried out; if not, the pipe is unusable; A hydrogen embrittlement sensitivity test module for pipes in a natural gas hydrogen-doped environment, for conducting a hydrogen embrittlement sensitivity test on the pipes in a natural gas hydrogen-doped environment to be tested based on the operating condition parameters, and determining the toughness zone area in a hydrogen-doped natural gas environment to evaluate the hydrogen embrittlement sensitivity of the pipes in the natural gas hydrogen-doped pipeline to be tested. If the requirement of no obvious brittleness index is met, subsequent testing is carried out, otherwise the pipes are unusable; The natural gas hydrogen blending environment is to conduct a test pre-hydrogenation treatment under the simulated test environment parameter conditions according to the pre-hydrogenation time determined by high-pressure hydrogen permeation; The fatigue life prediction module is used to determine the fatigue crack growth curve of the natural gas hydrogen-blended pipeline pipe to be tested based on the Paris formula, determine the load fluctuation range of the natural gas hydrogen-blended pipeline pipe to be tested based on the fatigue crack growth curve, and predict the pipeline life in combination with the load fluctuation range. Specifically, according to the fatigue crack growth curve, parameters C and m are fitted, and the parameters C and m are material constants related to the test conditions. Then, according to formulas (4) and (5), the number of cycles N is calculated. （4） （5） In formula (4), is the load fluctuation range determined according to the actual load spectrum. In formula (5), is the initial fatigue crack size, is the crack instability extension size, is the crack length; If the pipeline design life requirements are not met, the pipeline operating load and hydrogen blending ratio should be reduced and the fatigue life test should be repeated until the pipeline service conditions are met.

9. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed by a processor.

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