Pressurizing environment simulation experiment device and method for metal pipe in hydrogen-doped environment

Abstract

The invention provides a pressurization environment simulation experiment device and method for a metal pipe in a hydrogen-doped environment. The invention relates to a pressurization environment simulation experiment device for a metal pipe in a hydrogen-doped environment, which comprises a gas source, pressurization equipment, a high-pressure hydrogen-doped environment mixing cabin, an environment humidity control system and a test cabin, the supercharging equipment and the environment humidity control system are respectively connected with the high-pressure hydrogen-doped environment mixing cabin through pipelines, and the high-pressure hydrogen-doped environment mixing cabin is connected with the test cabin through a pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of applicability evaluation of pure hydrogen / hydrogen-blended natural gas long-distance pipelines, and in particular to a pressurized environment simulation experimental device and method for metal pipes in a hydrogen-blended environment. Background Art

[0002] When transporting hydrogen on a large scale, pipeline transportation is still the most economical and safe way. With the large-scale application of pipeline hydrogen transportation, the risk of hydrogen damage to pipes in service environments has gradually attracted attention. In recent years, domestic and foreign scholars have conducted mechanical property tests such as slow strain rate tensile, fracture toughness, and fatigue toughness on various types of pipeline steel materials in a hydrogen environment in order to obtain complete test data and improve the service conditions of pipeline steel.

[0003] Traditional environmental chambers are unable to perform humidity control of ambient gases and joint control of impurity gases. However, performance tests such as slow strain rate tensile, fracture toughness, and fatigue toughness in a hydrogen-containing environment are important indicators for detecting the hydrogen embrittlement sensitivity of pipes. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a pressurized environment simulation experimental device and method for metal pipes in a hydrogen-doped environment in view of the deficiencies in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment, comprising: a gas source, a pressurizing device, a high-pressure hydrogen-doped environment mixing chamber, an environmental humidity control system, and a test cabin. The gas source is connected to the pressurizing device through a pipeline, and the pressurizing device and the environmental humidity control system are respectively connected to the high-pressure hydrogen-doped environment mixing chamber through pipelines, and the high-pressure hydrogen-doped environment mixing chamber is connected to the test cabin through a pipeline.

[0006] The beneficial effects of adopting the technical solution of the present invention are: the environmental humidity control system is used to ensure the humidity content inside the test cabin. The environmental humidity control system can meet the environmental requirements such as humidity and impurity gases in the test. The test cabin provides test conditions for the evaluation of the hydrogen doping adaptability of metal pipes in different environments. The test cabin can perform slow strain rate tensile, fracture toughness, fatigue crack propagation and other tests according to the gas environment of the high-pressure hydrogen doping environment mixed chamber. Mechanical testing can be carried out in the process of applying gas phase hydrogen pressure and humidity control to the sample, and the structure is simple. It effectively simulates the service environment of hydrogen-doped natural gas pipelines and is easy to operate. It provides a basis for the evaluation of the applicability of steel pipeline materials in pure hydrogen / hydrogen-doped environments and provides support for the design of pure hydrogen / hydrogen-doped pipelines. Hydrogen permeation, slow strain rate tensile and fracture toughness tests can be carried out in the process of applying gas phase hydrogen pressure and impurity-containing gas environment to the sample.

[0007] Furthermore, a one-way valve is installed on the pipeline between the pressurizing device and the high-pressure hydrogen-blended environment mixing chamber.

[0008] The beneficial effect of adopting the above further technical solution is that the one-way valve can ensure the one-way flow of the gas path to the test cabin, prevent the backflow of the mixed gas, and improve the stability and reliability of the pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment.

[0009] Furthermore, the boosting equipment includes: a gas boosting pump, a first pressure valve, a first pressure gauge, a second pressure valve, an air compressor and a flow meter, the gas source is connected to the gas boosting pump through a pipeline, the gas boosting pump is connected to the high-pressure hydrogen-doped environment mixing chamber through a pipeline, the air compressor is connected to the second pressure valve through a pipeline, the second pressure valve is connected to the first pressure gauge through a pipeline, the first pressure gauge is connected to the first pressure valve through a pipeline, the first pressure valve is connected to the gas boosting pump through a pipeline, and the flow meter is installed on the pipeline between the gas boosting pump and the high-pressure hydrogen-doped environment mixing chamber.

[0010] The beneficial effect of adopting the above further technical solution is that the test cabin can adjust the flow rate according to the test requirements, which is convenient for pressurizing the gas source and realizing the hydrogen pressure environment according to actual needs.

[0011] Furthermore, the environmental humidity control system is connected to deionized water via a pipeline, and a gas atomization device is installed inside the environmental humidity control system.

[0012] The beneficial effect of adopting the above further technical solution is that the environmental humidity control system is used to ensure the humidity content inside the test cabin. The environmental humidity control system can meet the environmental requirements such as humidity and impurity gases in the test.

[0013] Furthermore, a humidity detector is installed in the high-pressure hydrogen-doped environment mixing chamber.

[0014] The beneficial effect of adopting the above further technical solution is that a humidity detector is embedded in the mixing chamber of the high-pressure hydrogen-doped environment to ensure sufficient mixing of the hydrogen-doped gas and water.

[0015] Furthermore, a test specimen is arranged in the test cabin, and an air intake pipeline, an exhaust pipeline, a valve and a discharge mechanism are installed on the test cabin.

[0016] The beneficial effect of adopting the above further technical solution is that the test cabin has air intake and exhaust pipes and valves, and is designed with a discharge mechanism to ensure the safe injection and discharge of the test gas.

[0017] Furthermore, the gas source includes a gas cylinder and a gas source quality, the gas source quality is arranged in the gas cylinder, a gas cylinder valve is installed on the gas cylinder, the gas cylinder valve is connected to a pressure reducing valve through a pipeline, and the pressure reducing valve is connected to the boosting equipment through a pipeline; the gas source quality includes: CO, CO2 and O2.

[0018] The beneficial effect of adopting the above further technical solution is that the gas source quality can include impurity gases CO, CO2, and O2, so that the impurity gas content can be proportioned according to actual application requirements.

[0019] In addition, the present invention also provides a pressurized environment simulation experimental method for metal pipes in a hydrogen-doped environment, and a pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment based on any one of the above-mentioned pressurized environment simulation experimental devices for metal pipes in a hydrogen-doped environment. The pressurized environment simulation experimental method for metal pipes in a hydrogen-doped environment includes: S1, placing a sample in a test cabin; S2, adjusting the gas composition and humidity through the pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment; S3, filling the test cabin with hydrogen for testing; S4, after the test, checking the fracture morphology of the sample and calculating the index parameters of the hydrogen embrittlement sensitivity of the metal pipe in the hydrogen environment.

[0020] The beneficial effects of adopting the technical solution of the present invention are: the environmental humidity control system is used to ensure the humidity content inside the test cabin. The environmental humidity control system can meet the environmental requirements such as humidity and impurity gases in the test. The test cabin provides test conditions for the evaluation of the hydrogen doping adaptability of metal pipes in different environments. The test cabin can perform slow strain rate tensile, fracture toughness, fatigue crack propagation and other tests according to the gas environment of the high-pressure hydrogen doping environment mixed chamber. Mechanical testing can be carried out in the process of applying gas phase hydrogen pressure and humidity control to the sample, and the structure is simple. It effectively simulates the service environment of hydrogen-doped natural gas pipelines and is easy to operate. It provides a basis for the evaluation of the applicability of steel pipeline materials in pure hydrogen / hydrogen-doped environments and provides support for the design of pure hydrogen / hydrogen-doped pipelines. Hydrogen permeation, slow strain rate tensile and fracture toughness tests can be carried out in the process of applying gas phase hydrogen pressure and impurity-containing gas environment to the sample.

[0021] Furthermore, the index parameters of hydrogen embrittlement sensitivity of metal pipes in a hydrogen environment include: slow strain rate tensile, fracture toughness and fatigue toughness in a hydrogen environment; step S3 includes: S31, filling the test cabin with hydrogen; S32, conducting a test after a preset time of hydrogen filling; step S4 includes: S41, depressurizing and purging the test cabin after the test; S42, checking the fracture morphology of the sample and calculating the index parameters of hydrogen embrittlement sensitivity of metal pipes in a hydrogen environment.

[0022] The beneficial effect of adopting the above further technical solution is: after the preset hydrogen filling time, the test is carried out, so that the pre-hydrogen filling is carried out for a sufficient time, thereby improving the accuracy of the test data. Hydrogen permeation, slow strain rate tensile and fracture toughness tests can be carried out in the process of applying gas phase hydrogen pressure and impurity-containing gas environment to the sample. After the test, the test cabin is depressurized and purged to improve the stability, reliability and safety of the test device.

[0023] Further, step S1 includes: S11, preparing samples, wherein the samples include smooth tensile samples, notched tensile round bar samples, fracture toughness test CT samples and fatigue crack extension samples; S12, placing the samples in a test cabin; S13, deoxidizing and drying the test cabin.

[0024] The beneficial effects of adopting the above further technical solution are: the specimens include smooth tensile specimens, notched tensile round bar specimens, fracture toughness test CT specimens and fatigue crack growth specimens. It is convenient to prepare specimens according to actual needs. The test cabin is deoxygenated and dried to prevent other gases and moisture from affecting the test data, thereby improving the accuracy of the test data.

[0025] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of a pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment provided in an embodiment of the present invention.

[0027] Figure 2 A schematic flowchart of a pressurized environment simulation experimental method for metal pipes in a hydrogen-doped environment provided in an embodiment of the present invention.

[0028] Explanation of the accompanying drawings: 1. Gas source; 2. Pressure reducing valve; 3. Gas booster pump; 4. First pressure valve; 5. First pressure gauge; 6. Second pressure valve; 7. Air compressor; 8. Flow meter; 9. High-pressure hydrogen-doped environment mixing chamber; 10. Third pressure valve; 11. Check valve; 12. Pressure valve; 13. Second pressure gauge; 14. Deionized water; 15. Environmental humidity control system; 16. Moisture delivery valve; 17. Valve; 18. Test cabin; 19. Moisture detector. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention but not to limit the scope of the present invention.

[0030] like Figure 1As shown, an embodiment of the present invention provides a pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment, including: a gas source 1, a pressurizing device, a high-pressure hydrogen-doped environment mixing chamber 9, an environmental humidity control system 15, and a test cabin 18. The gas source 1 is connected to the pressurizing device through a pipeline, and the pressurizing device and the environmental humidity control system 15 are respectively connected to the high-pressure hydrogen-doped environment mixing chamber 9 through pipelines, and the high-pressure hydrogen-doped environment mixing chamber 9 is connected to the test cabin 18 through a pipeline.

[0031] The beneficial effects of adopting the technical solution of the present invention are: the environmental humidity control system is used to ensure the humidity content inside the test cabin. The environmental humidity control system can meet the environmental requirements such as humidity and impurity gases in the test. The test cabin provides test conditions for the evaluation of the hydrogen doping adaptability of metal pipes in different environments. The test cabin can perform slow strain rate tensile, fracture toughness, fatigue crack propagation and other tests according to the gas environment of the high-pressure hydrogen doping environment mixed chamber. Mechanical testing can be carried out in the process of applying gas phase hydrogen pressure and humidity control to the sample, and the structure is simple. It effectively simulates the service environment of hydrogen-doped natural gas pipelines and is easy to operate. It provides a basis for the evaluation of the applicability of steel pipeline materials in pure hydrogen / hydrogen-doped environments and provides support for the design of pure hydrogen / hydrogen-doped pipelines. Hydrogen permeation, slow strain rate tensile and fracture toughness tests can be carried out in the process of applying gas phase hydrogen pressure and impurity-containing gas environment to the sample.

[0032] Among them, a valve 17 and a moisture detector 19 are installed on the pipeline between the high-pressure hydrogen-mixed environment mixing chamber 9 and the test cabin 18.

[0033] The present invention provides a pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment, which can be a pressurized environment simulation experimental device in a gas-phase hydrogen environment, which can perform mechanical tests in the process of applying gas-phase hydrogen pressure and humidity control to the sample, has a simple structure, and is easy to operate. The experimental device (pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment) includes a gas source 1, a pressurizing device, an environmental humidity control system 15, a high-pressure hydrogen-doped environment mixing chamber 9, and a test engine room 18; the outlet of the gas source 1 is connected to the inlet section of the pressurizing device, the outlet section of the pressurizing device is connected to the one-way valve 11, the environmental humidity control system 15 and the outlet of the one-way valve 11 are connected to the high-pressure environment mixing chamber (high-pressure hydrogen-doped environment mixing chamber 9), the high-pressure hydrogen-doped ring mixing chamber (high-pressure hydrogen-doped environment mixing chamber 9) is connected to the test engine room 18, and can be connected to a mechanical testing machine in a hydrogen environment to meet the hydrogen environment compatibility test requirements.

[0034] like Figure 1 As shown, further, a one-way valve 11 is installed on the pipeline between the pressurizing equipment and the high-pressure hydrogen-blended environment mixing chamber 9.

[0035] The beneficial effect of adopting the above further technical solution is that the one-way valve can ensure the one-way flow of the gas path to the test cabin, prevent the backflow of the mixed gas, and improve the stability and reliability of the pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment.

[0036] like Figure 1 As shown, further, the boosting equipment includes: a gas booster pump 3, a first pressure valve 4, a first pressure gauge 5, a second pressure valve 6, an air compressor 7 and a flow meter 8, the gas source 1 is connected to the gas booster pump 3 through a pipeline, the gas booster pump 3 is connected to the high-pressure hydrogen-doped environment mixing chamber 9 through a pipeline, the air compressor 7 is connected to the second pressure valve 6 through a pipeline, the second pressure valve 6 is connected to the first pressure gauge 5 through a pipeline, the first pressure gauge 5 is connected to the first pressure valve 4 through a pipeline, the first pressure valve 4 is connected to the gas booster pump 3 through a pipeline, and the flow meter 8 is installed on the pipeline between the gas booster pump 3 and the high-pressure hydrogen-doped environment mixing chamber 9.

[0037] The beneficial effect of adopting the above further technical solution is that the test cabin can adjust the flow rate according to the test requirements, which is convenient for pressurizing the gas source and realizing the hydrogen pressure environment according to actual needs.

[0038] A third pressure valve 10 is installed on the pipeline between the gas booster pump 3 and the flow meter 8. A pressure valve 12 and a second pressure gauge 13 are installed on the pipeline between the flow meter 8 and the one-way valve 11.

[0039] like Figure 1 As shown, further, the environmental humidity control system 15 is connected to the deionized water 14 through a pipeline, and a gas atomization device is installed inside the environmental humidity control system 15.

[0040] The beneficial effect of adopting the above further technical solution is that the environmental humidity control system is used to ensure the humidity content inside the test cabin. The environmental humidity control system can meet the environmental requirements such as humidity and impurity gases in the test.

[0041] Among them, a moisture delivery valve 16 is installed on the pipeline between the environmental humidity control system 15 and the high-pressure hydrogen-blended environmental mixing chamber 9.

[0042] Furthermore, a humidity detector is installed in the high-pressure hydrogen-doped environment mixing chamber 9 .

[0043] The beneficial effect of adopting the above further technical solution is that a humidity detector is embedded in the mixing chamber of the high-pressure hydrogen-doped environment to ensure sufficient mixing of the hydrogen-doped gas and water.

[0044] Furthermore, a test specimen is arranged in the test cabin 18 , and an air intake pipeline, an exhaust pipeline, a valve and a discharge mechanism are installed on the test cabin 18 .

[0045] The beneficial effect of adopting the above further technical solution is that the test cabin has air intake and exhaust pipes and valves, and is designed with a discharge mechanism to ensure the safe injection and discharge of the test gas.

[0046] like Figure 1 As shown, further, the gas source 1 includes a gas cylinder and a gas source quality, the gas source quality is arranged in the gas cylinder, a gas cylinder valve is installed on the gas cylinder, the gas cylinder valve is connected to a pressure reducing valve 2 through a pipeline, and the pressure reducing valve 2 is connected to the boosting equipment through a pipeline; the gas source quality includes: CO, CO2 and O2.

[0047] The beneficial effect of adopting the above further technical solution is that the gas source quality can include impurity gases CO, CO2, and O2, so that the impurity gas content can be proportioned according to actual application requirements.

[0048] An embodiment of the present invention provides a pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment, comprising a gas source 1, a pressurizing device, an environmental humidity control system 15, a high-pressure hydrogen-doped environment mixing chamber 9 and a test cabin 18. The outlet of the gas source 1 is connected to the inlet section of the pressurizing device, the outlet section of the pressurizing device is connected to the one-way valve 11, the environmental humidity control system 15 and the outlet of the one-way valve 11 are connected to the high-pressure environment mixing chamber (high-pressure hydrogen-doped environment mixing chamber 9), the high-pressure hydrogen-doped environment mixing chamber 9 is connected to the test cabin 18, and can be connected to a mechanical testing machine in a hydrogen environment to meet the hydrogen environment compatibility test requirements.

[0049] A gas cylinder valve is provided on the gas source 1, and the gas cylinder valve is connected to the pressure reducing valve 2. The gas source quality may include impurity gases CO, CO2, and O2, and the impurity gas content may be proportioned according to actual application requirements.

[0050] The boosting equipment includes: a gas boosting pump 3, an air compressor 7, a first pressure valve 4 and a first pressure gauge 5. The boosting equipment is connected to an air flow test cabin (test cabin 18). The boosting equipment is connected to an air flow meter (flow meter 8). The flow test cabin (test cabin 18) can adjust the flow rate and flow according to the test requirements.

[0051] The maximum outlet pressure of the booster pump (gas booster pump 3) is 25MPa, and the minimum inlet pressure is 1MPa. The power source of the gas booster pump 3 is an air source with a maximum output of 1MPa.

[0052] The one-way valve 11 can ensure that the gas path flows unidirectionally to the hydrogen blending test chamber (test chamber 18) to prevent the mixed gas from flowing back.

[0053] The environmental humidity control system 15 is connected to the deionized water 14, and contains a gas atomization device inside the environmental humidity control system 15, and the flow control can be as low as 0.0001ml / min; the flow accuracy is 0.0001ml / min, and the working pressure of 70MPa ensures the humidity content inside the environmental test chamber (test cabin 18).

[0054] The high-pressure environmental mixing chamber (high-pressure hydrogen-doped environmental mixing chamber 9) is connected to the humidity control system (environmental humidity control system 15) and the one-way valve 11. The gas chamber humidity control system (environmental humidity control system 15) can meet the environmental requirements of humidity, impurity gas, etc. in the test. A humidity detector is embedded in the high-pressure environmental mixing chamber (high-pressure hydrogen-doped environmental mixing chamber 9) to ensure sufficient mixing of the hydrogen-doped gas and water.

[0055] The test cabin 18 can perform slow strain rate tensile, fracture toughness, fatigue crack growth and other tests according to the gas environment of the high-pressure mixing cabin (high-pressure hydrogen-doped environment mixing cabin 9), and the sample is placed in a closed environmental test cabin for testing; the test cabin 18 has air intake and exhaust pipelines and valves, and is designed with a gas safety valve or bursting disc to ensure the safe injection and discharge of the test gas. Among them, the discharge mechanism includes a gas safety valve or a bursting disc.

[0056] like Figure 2 As shown, in addition, the present invention also provides a pressurized environment simulation experimental method for metal pipes in a hydrogen-doped environment, based on a pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment as described in any one of the above, the pressurized environment simulation experimental method for metal pipes in a hydrogen-doped environment includes: S1, placing a sample in a test cabin; S2, adjusting the gas composition and humidity through the pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment; S3, filling the test cabin with hydrogen for testing; S4, after the test, checking the fracture morphology of the sample and calculating the index parameters of the hydrogen embrittlement sensitivity of the metal pipe in the hydrogen environment.

[0057] The beneficial effects of adopting the technical solution of the present invention are: the environmental humidity control system is used to ensure the humidity content inside the test cabin. The environmental humidity control system can meet the environmental requirements such as humidity and impurity gases in the test. The test cabin provides test conditions for the evaluation of the hydrogen doping adaptability of metal pipes in different environments. The test cabin can perform slow strain rate tensile, fracture toughness, fatigue crack propagation and other tests according to the gas environment of the high-pressure hydrogen doping environment mixed chamber. Mechanical testing can be carried out in the process of applying gas phase hydrogen pressure and humidity control to the sample, and the structure is simple. It effectively simulates the service environment of hydrogen-doped natural gas pipelines and is easy to operate. It provides a basis for the evaluation of the applicability of steel pipeline materials in pure hydrogen / hydrogen-doped environments and provides support for the design of pure hydrogen / hydrogen-doped pipelines. Hydrogen permeation, slow strain rate tensile and fracture toughness tests can be carried out in the process of applying gas phase hydrogen pressure and impurity-containing gas environment to the sample.

[0058] Hydrogen pipeline transportation is currently a feasible way to achieve large-scale, long-distance, and low-cost transportation of hydrogen energy. Using the in-service natural gas pipeline network for hydrogen-blended transportation is a development trend that is generally recognized internationally. However, hydrogen molecules in the transmission medium inside the steel pipeline can be adsorbed on the inner wall of the pipeline, decomposed into hydrogen atoms and enter the steel, which can easily cause the loss of toughness or crack formation of the pipe, and even induce brittle fracture and cause safety accidents. There is still a lack of clear theoretical understanding and data support for the impact of pure hydrogen / hydrogen-blended medium conditions on the performance of metal pipes, as well as the safety boundaries and indicator systems. Although relevant standards for hydrogen transmission pipelines have been issued at home and abroad, there is no unified method for the environmental simulation method of pure hydrogen / hydrogen-blended natural gas pipelines. Therefore, it is necessary to establish an environmental simulation method for steel pipelines in pure hydrogen / hydrogen-blended natural gas pipeline transportation under hydrogen conditions, provide a basis for the applicability evaluation of steel pipeline materials under pure hydrogen / hydrogen-blended environments, and provide support for the design of pure hydrogen / hydrogen-blended pipelines.

[0059] The embodiment of the present invention provides an experimental method, and in particular, relates to a pressurized environment simulation experimental method for metal pipes in a hydrogen-doped environment. The experimental device includes a gas source, a pressurization device, an environmental humidity control system, a high-pressure hydrogen-doped environment mixing chamber, and a test cabin; the high-pressure hydrogen-doped environment mixing chamber provides test conditions for evaluating the hydrogen-doped adaptability of metal pipes in different environments, including pure hydrogen and hydrogen-doped environments. The present invention can perform hydrogen permeation, slow strain rate stretching, fracture toughness and other tests in the process of applying gas phase hydrogen pressure and impurity-containing gas environment to the sample, and has a simple structure and easy operation.

[0060] Furthermore, the index parameters of hydrogen embrittlement sensitivity of metal pipes in a hydrogen environment include: slow strain rate tensile, fracture toughness and fatigue toughness in a hydrogen environment; step S3 includes: S31, filling the test cabin with hydrogen; S32, conducting a test after a preset time of hydrogen filling; step S4 includes: S41, depressurizing and purging the test cabin after the test; S42, checking the fracture morphology of the sample and calculating the index parameters of hydrogen embrittlement sensitivity of metal pipes in a hydrogen environment.

[0061] The beneficial effect of adopting the above further technical solution is: after the preset hydrogen filling time, the test is carried out, so that the pre-hydrogen filling is carried out for a sufficient time, thereby improving the accuracy of the test data. Hydrogen permeation, slow strain rate tensile and fracture toughness tests can be carried out in the process of applying gas phase hydrogen pressure and impurity-containing gas environment to the sample. After the test, the test cabin is depressurized and purged to improve the stability, reliability and safety of the test device.

[0062] Among them, the preset time can be 12 hours or more.

[0063] Further, step S1 includes: S11, preparing samples, wherein the samples include smooth tensile samples, notched tensile round bar samples, fracture toughness test CT samples and fatigue crack extension samples; S12, placing the samples in a test cabin; S13, deoxidizing and drying the test cabin.

[0064] The beneficial effects of adopting the above further technical solution are: the specimens include smooth tensile specimens, notched tensile round bar specimens, fracture toughness test CT specimens and fatigue crack growth specimens. It is convenient to prepare specimens according to actual needs. The test cabin is deoxygenated and dried to prevent other gases and moisture from affecting the test data, thereby improving the accuracy of the test data.

[0065] The embodiment of the present invention provides a method for simulating a pressurized environment of a metal pipe in a hydrogen-doped environment, comprising the following steps:

[0066] Before the experiment, the sample is prepared. The size of the smooth tensile sample shall meet the proportional sample size selected in accordance with GB / T228.1. The notched tensile round bar sample shall be selected in accordance with GB / T34542.2. The fracture toughness test CT sample shall meet the proportional size selected in accordance with GB / T21143. The fatigue crack extension sample CT shall meet the requirements of GB / T6398. After the sample preparation is completed, the gas cabin (test cabin 18) shall be deoxygenated and dried after the sample gas cabin (test cabin 18) is assembled. Then, the pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment is used to adjust the gas composition and humidity required by the test. The test is started after pre-charging with hydrogen for a sufficient time (12 hours or more). After the test, the pressure is released and purged. The fracture morphology of the sample is checked, and the elongation ratio and section shrinkage ratio of the slow strain rate tensile test are calculated; or the K value of the fracture toughness characteristic value test based on quasi-static loading is calculated. IHAC Or J or δ; or the relationship curve between da / dN and ΔK.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment, characterized in that: include: An air source, a pressurizing device, a high-pressure hydrogen-doped environment mixing chamber, an environmental humidity control system, and a test cabin. The air source is connected to the pressurizing device through a pipeline, the pressurizing device and the environmental humidity control system are respectively connected to the high-pressure hydrogen-doped environment mixing chamber through pipelines, and the high-pressure hydrogen-doped environment mixing chamber is connected to the test cabin through a pipeline.

2. The pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment according to claim 1 is characterized in that: A one-way valve is installed on the pipeline between the pressurizing equipment and the high-pressure hydrogen-blended environment mixing chamber.

3. The pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment according to claim 1 is characterized in that: The boosting equipment includes: a gas boosting pump, a first pressure valve, a first pressure gauge, a second pressure valve, an air compressor and a flow meter, the gas source is connected to the gas boosting pump through a pipeline, the gas boosting pump is connected to the high-pressure hydrogen-doped environment mixing chamber through a pipeline, the air compressor is connected to the second pressure valve through a pipeline, the second pressure valve is connected to the first pressure gauge through a pipeline, the first pressure gauge is connected to the first pressure valve through a pipeline, the first pressure valve is connected to the gas boosting pump through a pipeline, and the flow meter is installed on the pipeline between the gas boosting pump and the high-pressure hydrogen-doped environment mixing chamber.

4. The pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment according to claim 1 is characterized in that: The environmental humidity control system is connected to deionized water through a pipeline, and a gas atomization device is installed inside the environmental humidity control system.

5. The pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment according to claim 1 is characterized in that: A humidity detector is installed in the high-pressure hydrogen-doped environment mixing chamber.

6. The pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment according to claim 1 is characterized in that: A test specimen is arranged in the test cabin, and an air intake pipeline, an exhaust pipeline, a valve and a discharge mechanism are installed on the test cabin.

7. The pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment according to claim 1 is characterized in that: The gas source includes a gas cylinder and a gas source quality, the gas source quality is arranged in the gas cylinder, a gas cylinder valve is installed on the gas cylinder, the gas cylinder valve is connected to a pressure reducing valve through a pipeline, and the pressure reducing valve is connected to the boosting device through a pipeline; the gas source quality includes: CO, CO2 and O2.

8. A method for simulating a pressurized environment for metal pipes in a hydrogen-doped environment, characterized in that: Based on the pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment according to any one of claims 1 to 7, the pressurized environment simulation experimental method for metal pipes in a hydrogen-doped environment comprises: S1. Place the sample into the test cabin; S2. Adjusting gas composition and humidity through a pressurized environment simulation experimental device for metal pipes in a hydrogen-doped environment; S3. Fill the test cabin with hydrogen for testing; S4. After the test, check the fracture morphology of the sample and calculate the index parameters of hydrogen embrittlement sensitivity of the metal pipe in the hydrogen environment.

9. The pressurized environment simulation experimental method for metal pipes in a hydrogen-doped environment according to claim 8, characterized in that: The index parameters of hydrogen embrittlement sensitivity of metal pipes in hydrogen environment include: slow strain rate tensile, fracture toughness and fatigue toughness in hydrogen environment; Step S3 includes: S31. Fill the test engine room with hydrogen; S32, after the preset hydrogen charging time, conduct the test; Step S4 includes: S41. After the test, the test cabin shall be depressurized and purged; S42. Check the fracture morphology of the sample and calculate the index parameters of hydrogen embrittlement sensitivity of the metal pipe in the hydrogen environment.

10. The pressurized environment simulation experimental method for metal pipes in a hydrogen-doped environment according to claim 8, characterized in that: Step S1 includes: S11, preparing samples, wherein the samples include smooth tensile samples, notched tensile round bar samples, fracture toughness test CT samples and fatigue crack growth samples; S12. Place the sample in the test cabin; S13. Deoxygenate and dry the test cabin.

Images