Hydrogen embrittlement resistance sensitivity testing device based on gas inhibitor

Abstract

The invention relates to the technical field of hydrogen embrittlement resistance sensitivity testing devices, in particular to a hydrogen embrittlement resistance sensitivity testing device based on a gas inhibitor, which comprises a gas configuration mechanism, the gas outlet end of the gas configuration mechanism is connected with the first gas inlet end of a buffer tank through a first pipeline; the gas outlet end of the buffer tank is connected with the gas inlet end of the reaction kettle through a second pipeline; the gas outlet end of the reaction kettle is connected with the waste gas recycling mechanism through a third pipeline; the gas configuration mechanism comprises a workbench, multiple rows of first gas conveying pipes are arranged on the upper portion of the workbench, the head ends of the multiple rows of first gas conveying pipes are connected with a plurality of gas storage bottles respectively, and the tail ends of the multiple rows of first gas conveying pipes are connected with a first pipeline. According to the invention, by changing the composition and proportion of the inhibition gas and changing the pressure and temperature in the reaction kettle, the visual test research on the hydrogen embrittlement resistance sensitivity of samples with different shapes and sizes in different inhibition gas environments can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen embrittlement resistance sensitivity testing devices, in particular to a hydrogen embrittlement resistance sensitivity testing device based on a gas inhibitor. Background Art

[0002] Hydrogen energy, that is, the chemical energy of hydrogen, is the energy released by the element hydrogen during physical and chemical changes. Hydrogen energy is regarded as a secondary clean energy source and is known as the "ultimate energy of the 21st century". It is also an important energy source that is being accelerated in its development and utilization under the goal of "carbon peak and carbon neutrality". The mass energy density of hydrogen is high (1.42×102MJ / kg), which is three times the calorific value of gasoline. However, its volume energy density at normal temperature and pressure is only 0.0127MJ / L, and it needs to be pressurized to 70MPa to significantly increase its volume energy density. This will induce hydrogen embrittlement in hydrogen energy infrastructure (hydrogen storage containers, hydrogen storage materials, hydrogen refueling stations, etc.), which seriously threatens the safe operation of hydrogen energy infrastructure.

[0003] Hydrogen embrittlement is an important phenomenon in metals. Specifically, it refers to the hydrogen dissolved in metals such as steel, which polymerizes into hydrogen molecules under certain conditions, causing stress concentration. When this stress exceeds the strength limit of the metal, tiny cracks will form inside the metal, causing the mechanical properties of the material to become brittle, or even break. Hydrogen embrittlement, also known as white spots, is one of the quality risks that require special attention during metal processing and use. Hydrogen energy infrastructure is prone to hydrogen embrittlement when subjected to mechanical loading in a high-pressure hydrogen environment. This phenomenon also manifests itself to a certain extent in high or low temperature environments.

[0004] At present, the methods of inhibiting / preventing hydrogen embrittlement are mainly divided into three aspects: improving the intrinsic properties of materials, internal coatings and gas inhibitors. As for gas inhibitors, the explanation with a higher degree of recognition is to use the competitive adsorption of gases such as O2, CO, CO2, CH4, NH3, etc. in the adsorption and cleavage process of hydrogen molecules in hydrogen storage materials: various gas molecules have different stable adsorption positions on the metal surface, and the absolute value of adsorption energy (abbreviated as adsorption energy) is also different. Gas molecules with large adsorption energy will preferentially adsorb on the metal surface and occupy a stable position, thereby hindering the combination of hydrogen molecules and metals and reducing the diffusion and aggregation of hydrogen atoms inside the metal material.

[0005] The effects of pressure and temperature on hydrogen embrittlement are also significant. They promote the behavior of hydrogen in metals to varying degrees, thereby increasing the risk of hydrogen embrittlement. Currently, there are few reports on devices that can simultaneously consider the coupling effects of gas inhibitors, temperature and pressure to conduct hydrogen embrittlement sensitivity tests.

[0006] During the hydrogen embrittlement sensitivity test with suppressed gas, the hydrogen embrittlement sensitivity behaviors of the sample, such as morphology and crack propagation, change in real time under the action of suppressed gas. There are few devices that can realize real-time observation of the sample morphology during the hydrogen embrittlement sensitivity test with suppressed gas.

[0007] The size and shape of the sample also affect the test of hydrogen embrittlement performance. Currently, there are few devices that can perform hydrogen embrittlement sensitivity tests on samples of different shapes and sizes in the same reactor. Summary of the invention

[0008] The purpose of the present invention is to provide a hydrogen embrittlement resistance sensitivity testing device based on a gas inhibitor, which can realize a visualized test study on the hydrogen embrittlement resistance sensitivity of samples of different shapes and sizes under different inhibitory gas environments by changing the composition and proportion of the inhibitory gas and simultaneously changing the pressure and temperature in the reactor.

[0009] The present invention adopts the following technical solutions to achieve the above purpose:

[0010] A hydrogen embrittlement resistance sensitivity test device based on a gas inhibitor comprises a gas configuration mechanism, wherein the gas outlet end of the gas configuration mechanism is connected to the first gas inlet end of a buffer tank via a first pipeline, the gas outlet end of the buffer tank is connected to the gas inlet end of a reactor via a second pipeline; the gas outlet end of the reactor is connected to an exhaust gas recycling mechanism via a third pipeline;

[0011] The gas configuration mechanism comprises a workbench, and a plurality of rows of first gas pipes are arranged on the upper part of the workbench, the head ends of the plurality of rows of first gas pipes are respectively connected to a plurality of gas storage bottles, and the tail ends of the plurality of rows of first gas pipes are connected to the first pipeline.

[0012] Preferably, the reactor is arranged on a tensile testing machine, and the upper and lower loading rods of the tensile testing machine respectively penetrate the reactor and extend into the reactor, and the upper and lower loading rods of the tensile testing machine are both fixed with clamps for clamping the sample.

[0013] Preferably, the outside of the reactor is provided with a heating layer, the temperature of which is increased by a temperature regulating box; an insulation shell is provided on the outside of the heating layer; and the temperature of the reactor is lowered by a cooling water circulation device.

[0014] Preferably, the waste gas recycling mechanism comprises a plurality of adsorption gas cylinders interconnected via a fourth pipe, wherein the adsorption gas cylinders have an adsorption layer therein.

[0015] Preferably, flow meters and solenoid valves are installed on the multiple rows of first gas pipelines, and a flow regulating valve is installed on the first pipeline.

[0016] Preferably, a display screen, a pressure gauge and a solenoid valve switch are provided at the lower part of the workbench.

[0017] Preferably, the second air inlet end of the buffer tank is connected to a pressure pump via a second air pipeline, and a gas pressure controller is provided on the second air pipeline.

[0018] Preferably, it further comprises a camera, wherein the lens of the camera is aimed at the side wall window of the reactor; the camera is driven by a mechanical arm, and the mechanical arm is arranged on a bracket.

[0019] Preferably, the camera is connected to the display via a data cable.

[0020] Preferably, the shape of the clamp is any one of a parallel chuck clamp, a V-groove clamp, a dumbbell-shaped clamp and a tubular clamp.

[0021] Beneficial effects of the present invention:

[0022] The present invention can change the composition ratio, pressure and temperature of the inhibitor gas according to the demand, and simulate the influence of the gas inhibitor on the anti-hydrogen embrittlement sensitivity under different pressures and high / low temperature conditions. In addition, the present invention can observe the test state of the sample in real time and realize the anti-hydrogen embrittlement sensitivity test of samples of different shapes and sizes.

[0023] The present invention can realize a visualized test study on the anti-hydrogen embrittlement sensitivity of samples of different shapes and sizes under different inhibitory gas environments by changing the composition and proportion of the inhibitory gas and simultaneously changing the pressure and temperature in the reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 It is a structural diagram of the workbench.

[0026] Figure 3 It is a schematic diagram of the structure of the fixture.

[0027] Figure 4 It is a schematic diagram of the structure of the adsorption gas cylinder.

[0028] In the figure: a first pipeline 6, a buffer tank 16, a second pipeline 7, a reactor 9, a third pipeline 40, a workbench 14, a first gas pipeline 21, a gas storage bottle 13, a tensile testing machine 17, a heating layer 8, a temperature regulating box 11, an insulation shell 10, a cooling water circulation device 12, a cooling air inlet pipeline 30, a cooling air outlet pipeline 31, a fourth pipeline 41, an adsorption gas bottle 20, an adsorption layer 39, a flow meter 22, a solenoid valve 23, a flow regulating valve 15, a display screen 26, a pressure gauge 24, a solenoid valve switch 25, a second gas pipeline 32, a pressure pump 1, a gas pressure controller 2, a camera 5, a bracket 4, a display 3, a parallel chuck fixture 34, a V-groove fixture 35, a dumbbell-shaped fixture 37, a tubular fixture 38, an exhaust gas outlet pipe 43, an exhaust gas recovery tank 19, and a valve 42. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] like Figure 1-Figure 2 As shown, the present invention provides a first embodiment of a hydrogen embrittlement sensitivity test device based on a gas inhibitor, including a gas configuration mechanism, through which different gases can be allocated according to the inhibitory gas components and proportions required for the test, so as to facilitate subsequent tests; the gas outlet end of the gas configuration mechanism is connected to the first gas inlet end of the buffer tank 16 via a first pipe 6, and the gas outlet end of the buffer tank 16 is connected to the gas inlet end of the reactor 9 via a second pipe 7; the gas outlet end of the reactor 9 is connected to the exhaust gas circulation recovery mechanism via a third pipe 40; the exhaust gas after the test can be recovered through the exhaust gas circulation recovery mechanism.

[0031] The gas configuration mechanism includes a workbench 14, and a plurality of rows of first gas pipes 21 are arranged on the upper part of the workbench 14. The head ends of the plurality of rows of first gas pipes 21 are respectively connected to a plurality of gas cylinders 13, and the tail ends of the plurality of rows of first gas pipes 21 are connected to the first pipeline 6. There are seven gas cylinders 13, and the gases therein are H2, N2, CH4, NH3, CO2, CO, and O2. Among them, N2 is used to purge the residual gas in the device to obtain a pure gas environment, H2 is the ambient gas for studying the hydrogen embrittlement fracture test, and CH4, NH3, CO2, CO, and O2 are allocated according to the inhibition gas components and proportions required for the test.

[0032] The reactor 9 is arranged on a tensile testing machine 17. The upper and lower loading rods of the tensile testing machine 17 penetrate the reactor 9 and extend into the reactor 9 respectively. The upper and lower loading rods of the tensile testing machine 17 are fixedly connected to the reactor 9, and a sealing ring is provided at the connection to prevent gas leakage. A clamp for clamping the sample is fixed on the upper and lower loading rods of the tensile testing machine 17. The clamp is fixedly connected to the sample by bolts or pins and is easy to disassemble and assemble. The tensile testing machine 17 can be used to perform tensile loading on the sample, which is convenient for subsequent testing.

[0033] The reactor 9 is provided with a heating layer 8 on the outside, and the temperature of the heating layer 8 is increased by a temperature regulating box 11, and the model of the temperature regulating box 11 may be SP-80A, but is not limited thereto; an insulation shell 10 is provided on the outside of the heating layer 8; the temperature of the reactor 9 is reduced by a cooling water circulation device 12, and the model of the cooling water circulation device 12 may be CLH312C, but is not limited thereto. The air inlet of the cooling water circulation device 12 is connected to the reactor 9 through a cooling air inlet pipe 30, and the air outlet is connected to the reactor 9 through a cooling air outlet pipe 31, so that the gas in the reactor 9 enters the cooling water circulation device 12 through the cooling air inlet pipe 30 to cool down, and then enters the reactor 9 through the cooling air outlet pipe 31, which has a cooling effect. The temperature regulating box 11 controls the heating layer 8 to increase the temperature in the reactor 9, and the cooling water circulation device 12 reduces the temperature in the reactor 9. The insulation shell 10 keeps the regulated temperature warm so as to provide the temperature required for the test.

[0034] The exhaust gas recycling mechanism includes a plurality of adsorption gas cylinders 20 interconnected via a fourth pipe 41 . The adsorption gas cylinders 20 have an adsorption layer 39 therein. The adsorption layer 39 has a nanoporous material therein. The nanoporous material is MOFs.

[0035] By changing the metal ions or organic ligands of MOFs, different gases can be adsorbed. Changing the metal ions or organic ligands of MOFs is a prior art known in the art. The specific changes are not protected by the present invention.

[0036] Based on the previous embodiment, the present invention provides a second embodiment, wherein a flow meter 22 and a solenoid valve 23 are installed on each of the multiple rows of first gas pipelines 21, and a flow regulating valve 15 is installed on the first pipeline 6. The flow meter 22 is used to monitor the flow of the gas in the first gas pipeline 21, and the flow of the gas is controlled by the solenoid valve 23, thereby mixing different gases. The flow regulating valve 15 can adjust the gas delivery amount in the first pipeline 6, so as to facilitate the adjustment of the gas amount in the buffer tank 16.

[0037] Based on the previous embodiment, the present invention provides a third embodiment, wherein a display screen 26, a pressure gauge 24 and a solenoid valve switch 25 are provided at the lower part of the workbench 14. The display screen 26 is used to display various parameters inside the first gas pipeline 21, the pressure gauge 24 is used to monitor the pressure in the pipeline, and the solenoid valve switch 25 is used to control the opening and closing of the solenoid valve 23.

[0038] Based on any of the above embodiments, the present invention provides a fourth embodiment, wherein the second gas inlet end of the buffer tank 16 is connected to a pressure pump 1 via a second gas delivery pipe 32, and a gas pressure controller 2 is provided on the second gas delivery pipe 32. The model of the gas pressure controller 2 may be PP34, but is not limited thereto. The gas in the buffer tank 16 is pressurized by the combined action of the pressure pump 1 and the gas pressure controller 2, and is finally pressed into the reactor 9.

[0039] Based on any of the above embodiments, the present invention provides a fifth embodiment, further comprising a camera 5, the lens of the camera 5 is aimed at the side wall window of the reactor 9; the camera 5 is driven by a mechanical arm, and the mechanical arm is arranged on a bracket 4. The state in the reactor 9 can be photographed by the camera 5, and the shooting angle of the camera 5 can be adjusted by the mechanical arm.

[0040] Based on the previous embodiment, the present invention provides a sixth embodiment, wherein the camera 5 is connected to the display 3 via a data line, and the changing state of the sample during the test process can be observed in real time through the display.

[0041] like Figure 3 As shown, based on any of the above embodiments, the present invention provides a seventh embodiment, wherein the shape of the clamp is any one of a parallel chuck clamp 34, a V-groove clamp 35, a dumbbell clamp 37, and a tubular clamp 38. The parallel chuck clamp 34 is used for tensile testing of rectangular specimens; the V-groove clamp 35 can fix circular specimens; the dumbbell clamp 37 is suitable for dumbbell-shaped specimens with wider ends and thinner middle parts; and the tubular clamp 38 is suitable for tubular specimens with hollow circular cross-sections. Different shapes of clamps can be used to clamp specimens of different shapes, so that specimens of different shapes can be tested.

[0042] like Figure 4 As shown, based on any one of the above embodiments, the present invention provides an eighth embodiment, wherein the fourth pipeline 41 is connected to the exhaust gas recovery tank 19 via the exhaust gas outlet pipe 43, and the exhaust gas outlet pipe 43 is provided with a valve 42. After the separation of the mixed gas is completed, the valve 42 is opened to allow the exhaust gas to be discharged into the exhaust gas recovery tank 19 through the exhaust gas outlet pipe 43.

[0043] On the basis of any of the above embodiments, the present invention provides a ninth embodiment, a method for using a hydrogen embrittlement resistance sensitivity test device based on a gas inhibitor, the method is as follows:

[0044] Step 1: After selecting the corresponding fixture according to the shape of the specimen, fix the fixture to the upper and lower loading rods of the tensile testing machine, and then fix the fixture to the specimen;

[0045] Step 2: The gas configuration mechanism distributes different gases according to the inhibitory gas composition and ratio of the test, and delivers them to the buffer tank through the flow control valve;

[0046] Step 3: The gas in the buffer tank is pressurized by the combined action of the pressure pump and the gas pressure controller, and finally pressed into the reactor, and the sample reacts with the mixed gas;

[0047] Step 4: During the reaction process, the temperature in the reactor is adjusted to the required temperature through the temperature control box, the heating layer and the cooling water circulation device, and the temperature is kept warm by the insulation shell;

[0048] Step 5: After the reaction is completed, the gas in the reactor is discharged into the exhaust gas recycling mechanism, and then the sample is stretched by a tensile testing machine. During the stretching process, the changing state of the sample during the test is observed in real time through the display.

[0049] The above description is only a preferred embodiment of the present invention and should not be construed as limiting the present application. All equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A hydrogen embrittlement resistance sensitivity test device based on gas inhibitor, characterized in that: It comprises a gas configuration mechanism, the gas outlet end of the gas configuration mechanism is connected to the first gas inlet end of the buffer tank through a first pipeline, the gas outlet end of the buffer tank is connected to the gas inlet end of the reactor through a second pipeline; the gas outlet end of the reactor is connected to the exhaust gas recycling mechanism through a third pipeline; The gas configuration mechanism comprises a workbench, and a plurality of rows of first gas pipes are arranged on the upper part of the workbench, the head ends of the plurality of rows of first gas pipes are respectively connected to a plurality of gas storage bottles, and the tail ends of the plurality of rows of first gas pipes are connected to the first pipeline.

2. The hydrogen embrittlement resistance sensitivity testing device based on gas inhibitor according to claim 1 is characterized in that: The reactor is arranged on a tensile testing machine, and the upper and lower loading rods of the tensile testing machine respectively penetrate the reactor and extend into the reactor, and the upper and lower loading rods of the tensile testing machine are both fixed with clamps for clamping the sample.

3. A gas inhibitor-based hydrogen embrittlement resistance sensitivity test device according to claim 1 or 2, characterized in that: The reactor has a heating layer on the outside, and the temperature of the heating layer is increased by a temperature regulating box; a heat preservation shell is arranged on the outside of the heating layer; and the temperature of the reactor is reduced by a cooling water circulation device.

4. The hydrogen embrittlement resistance sensitivity testing device based on gas inhibitor according to claim 1 is characterized in that: The waste gas recycling mechanism comprises a plurality of adsorption gas cylinders interconnected via a fourth pipeline, wherein the adsorption gas cylinders have adsorption layers therein.

5. The hydrogen embrittlement resistance sensitivity testing device based on gas inhibitor according to claim 1 is characterized in that: Flow meters and solenoid valves are installed on the multiple rows of first gas pipelines, and a flow regulating valve is installed on the first pipeline.

6. The hydrogen embrittlement resistance sensitivity testing device based on gas inhibitor according to claim 4 is characterized in that: A display screen, a pressure gauge and a solenoid valve switch are arranged at the lower part of the workbench.

7. The hydrogen embrittlement resistance sensitivity testing device based on gas inhibitor according to claim 1 is characterized in that: The second air inlet end of the buffer tank is connected to a pressure pump via a second air pipeline, and a gas pressure controller is provided on the second air pipeline.

8. The hydrogen embrittlement resistance sensitivity testing device based on gas inhibitor according to claim 1 is characterized in that: It also includes a camera, the lens of which is aimed at the side wall window of the reactor; the camera is driven by a mechanical arm, and the mechanical arm is set on a bracket.

9. The hydrogen embrittlement resistance sensitivity testing device based on gas inhibitor according to claim 7, characterized in that: The camera is connected to the display via a data line.

10. The hydrogen embrittlement resistance sensitivity testing device based on gas inhibitor according to claim 2, characterized in that: The shape of the clamp is any one of a parallel chuck clamp, a V-groove clamp, a dumbbell clamp and a tubular clamp.

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