Hydrogen storage container corrosion detection device

Abstract

The invention relates to the technical field of hydrogen storage container detection, in particular to a hydrogen storage container corrosion detection device, which simulates the corrosion condition of the inner wall of a hydrogen storage container through a thin sample tube, realizes non-intrusive detection by using hydrogen permeability characteristics, accurately monitors the corrosion degree of the hydrogen storage container and ensures the safety of the hydrogen storage container.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen storage container detection, and in particular to a hydrogen storage container corrosion detection device. Background Art

[0002] Hydrogen storage containers are equipment specially used to store hydrogen and are widely used in energy, chemical industry, energy storage and other fields. According to different manufacturing materials and structures, hydrogen storage containers can be divided into all-metal hydrogen storage cylinders (Type I cylinders), composite hydrogen storage cylinders (Type II, Type III, Type IV cylinders), etc. Among them, all-metal hydrogen storage cylinders are usually made of Cr-Mo steel, 6061 aluminum alloy, 316L stainless steel and other materials. Since hydrogen has a smaller molecular structure and stronger permeability, it may penetrate and diffuse through the container wall under high pressure, resulting in hydrogen embrittlement inside the hydrogen storage container. In severe cases, it may cause structural failure of the container or even high-pressure bursting. This phenomenon is called corrosion of hydrogen storage containers, which is mainly manifested as material performance degradation caused by the penetration, diffusion and accumulation of hydrogen molecules in the container material.

[0003] The corrosion degree of hydrogen storage containers is directly related to storage safety. Therefore, effective detection and monitoring of the corrosion state of hydrogen storage containers is crucial. The core of corrosion detection is to measure the degree of hydrogen molecule penetration and evaluate the hydrogen corrosion of the inner wall of the hydrogen storage container. The existing corrosion detection of hydrogen storage containers mainly adopts the hydrogen flux method and the hydrogen probe method. The hydrogen flux method is a non-invasive detection technology based on the diffusion and migration behavior of hydrogen in metal materials. After hydrogen molecules are adsorbed on the inner wall of the hydrogen storage container, they enter the material through the diffusion mechanism and seep out of the outer wall of the container to form trace hydrogen. By measuring the hydrogen concentration at different positions, the hydrogen flux per unit area per unit time is calculated, thereby obtaining the corrosion degree of the container. The main technical feature of this method is to use Fourier's law to deduce the relationship between hydrogen flux and corrosion rate through hydrogen concentration gradient; the hydrogen probe method evaluates the corrosion state by measuring the diffusion and accumulation of hydrogen atoms in the material, and uses hydrogen sensitive sensors (including electrochemical sensors, optical sensors and semiconductor sensors, etc.) to monitor the concentration changes after hydrogen penetration in real time. This method can directly obtain hydrogen concentration information on the surface or local area of ​​the material, which is suitable for analyzing the hydrogen corrosion rate in metal materials.

[0004] Although the hydrogen flux method and the hydrogen probe method have been widely used in corrosion detection of hydrogen storage containers, they still have the following common problems and technical deficiencies in actual use. The hydrogen flux method has the problem of insufficient sensitivity. In order to ensure the safety of high-pressure storage, hydrogen storage containers usually adopt a thick side wall design. When the hydrogen flux method detects thick-walled containers, the hydrogen diffusion rate is slow, resulting in a weakened hydrogen flux signal, and the measurement sensitivity and accuracy are significantly reduced, especially when the degree of corrosion is relatively light, it is difficult to capture trace hydrogen signals; and the detection results of the hydrogen probe method are easily affected by external environmental conditions (such as temperature, pressure and other factors). The sensor has limited adaptability to high-pressure environments, which may lead to unstable measurement results. In addition, the installation of the hydrogen probe needs to consider the operating conditions and monitoring location of the equipment, and the operation is complicated. There are certain technical application barriers. Therefore, it is necessary to develop a corrosion detection device for hydrogen storage containers. Summary of the invention

[0005] In view of the above-mentioned defects and problems, the present invention provides a hydrogen storage container corrosion detection device, which aims to simulate the corrosion of the inner wall of the hydrogen storage container through a thin sample tube, use the hydrogen permeation characteristics to achieve non-invasive detection, accurately monitor the degree of corrosion of the hydrogen storage container, and ensure its safety.

[0006] The solution adopted by the present invention to solve its technical problems is: a hydrogen storage container corrosion detection device, including a hydrogen storage container and a detection mechanism, the detection mechanism including an outer tube, a thin sample tube, a docking tube and a hydrogen probe, the end of the outer tube is connected to the pipe mouth flange of the hydrogen storage container, and radial ribs are evenly distributed on the inner wall of the outer tube in the radial direction, the thin sample tube is matched and sleeved in the placement channel surrounded by the radial ribs, and an independent closed cavity is formed between adjacent radial ribs; the docking tube is arranged on the inner end side of the outer tube and communicated with the pipe mouth of the hydrogen storage container, and the annular baffle on the outer peripheral side of the docking tube is fixedly connected to the inner wall of the outer tube, so that a sealed annular cavity is formed between the docking tube and the outer tube, and the closed cavity is communicated with the annular cavity through the air vents of the annular baffle; the thin sample tube The tube can be sealed and docked with the end of the docking matching tube; the hydrogen probe is arranged in the annular cavity, and the hydrogen probe is connected to the external controller signal, and an auxiliary tube for pressing the thin sample tube is provided at the outer end of the outer tube, and the outer end of the auxiliary tube is sealed; the thin sample tube is connected to the hydrogen storage container through the docking matching tube, and hydrogen can penetrate the thin sample tube through the thin wall characteristics of the thin sample tube. When the hydrogen in the hydrogen storage container penetrates the thin sample tube, hydrogen can be uniformly generated in an independent closed cavity. At the same time, the hydrogen in each closed cavity is collected in the annular area, and the amount of hydrogen is detected by the hydrogen probe. By detecting the hydrogen penetration degree of the thin sample tube, the corrosion degree of the inner wall of the hydrogen storage container can be simulated, so that the thin sample tube can synchronously reflect the corrosion degree of the inner wall of the hydrogen storage container.

[0007] The beneficial effects of the present invention are as follows: the present invention has a unique structure and an ingenious design. By arranging a detection mechanism outside the hydrogen storage container, non-invasive corrosion detection is achieved. The permeability characteristics of hydrogen are utilized to simulate the corrosion behavior of the inner wall of the hydrogen storage container through a thin sample tube, thereby avoiding the complexity of directly processing the hydrogen storage container body and improving the safety and efficiency of detection. The thin-wall characteristics of the thin sample tube enable hydrogen to easily penetrate the tube wall. The corrosion condition of the inner wall of the hydrogen storage container is simulated through the corrosion state of the thin sample tube. The thin sample tube is directly connected to the inside of the hydrogen storage container, and the wall of the thin sample tube is thinner. The rate at which hydrogen penetrates into the closed cavity corresponds to the corrosion state of the inner wall of the hydrogen storage container. The corrosion degree of the thin sample tube can synchronously reflect the actual corrosion condition inside the hydrogen storage container, has the effect of synchronous corrosion simulation, and can monitor the corrosion state of the hydrogen storage container in real time at a relatively low cost. The thin sample tube can be replaced regularly and stored in a tube for sample retention. The thin sample tube can be replaced regularly and stored in a tube for sample retention. The tube is used to simulate the corrosion of the inner wall of the hydrogen storage container. The amount of hydrogen that permeates reflects the degree of corrosion of the hydrogen storage container per unit time. The thin sample tube records the corresponding corrosion state within the time period. After replacing the storage tube and retaining the sample, it can be used as a basis for the long-term corrosion trend of the hydrogen storage container; the radial ribs can support the thin sample tube and provide support strength for the thin sample tube, and the outer tube can also protect the thin sample tube. When hydrogen permeates from the hydrogen storage container through the thin sample tube, the closed cavity can independently and evenly capture the amount of hydrogen permeation, and the hydrogen in each closed cavity can be collected in the annular cavity. The hydrogen probe set in the annular cavity can be uniformly detected, avoiding the complex multi-point sensor arrangement, and the overall detection can be achieved through one hydrogen probe; the thin sample tube can be pressed and replaced by the auxiliary tube, so that the thin sample tube is sealed and connected with the docking tube to avoid leakage, and the thin sample tube can also be stably placed in the placement channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0009] Figure 2 It is a schematic diagram of the overall structure of the detection mechanism of the present invention.

[0010] Figure 3 This is one of the internal cross-sectional views of the detection mechanism of the present invention.

[0011] Figure 4 This is the second internal cross-sectional view of the detection mechanism of the present invention.

[0012] Figure 5 Schematic diagram of the internal structure of the outer tube.

[0013] In the figure: 1-hydrogen storage container, 11-pipe mouth, 12-pipe mouth flange, 2-detection mechanism, 21-outer tube, 211-flange one, 212-flange two, 22-thin sample tube, 23-butt fitting tube, 24-hydrogen probe, 25-radial ribs, 26-closed cavity, 27-annular baffle, 28-annular cavity, 29-air vent, 30-rubber ring, 31-controller, 32-auxiliary tube, 33-flange three, 34-flange four, 35-flange cover. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Example 1. The existing hydrogen flux method and hydrogen probe method still have some problems in corrosion detection of hydrogen storage containers. The hydrogen flux method has the problem of insufficient sensitivity. In order to ensure the safety of high-pressure storage, hydrogen storage containers usually adopt a thick side wall design. When the hydrogen flux method detects thick-walled containers, the hydrogen diffusion rate is slow, resulting in a weakened hydrogen flux signal, and the measurement sensitivity and accuracy are significantly reduced, especially when the degree of corrosion is relatively light, it is difficult to capture trace hydrogen signals; and the detection results of the hydrogen probe method are easily affected by external environmental conditions (such as temperature, pressure and other factors). The sensor has limited adaptability to high-pressure environments, which may lead to unstable measurement results, and the installation of the hydrogen probe needs to consider the operating conditions and monitoring location of the equipment.

[0016] In view of the above problems, this embodiment provides a hydrogen storage container corrosion detection device, which simulates the corrosion of the inner wall of the hydrogen storage container 1 through the detection mechanism 2, and uses the hydrogen permeation characteristics to achieve non-invasive detection, and accurately monitors the corrosion degree of the hydrogen storage container 1. Figure 1-4 As shown, it includes a hydrogen storage container 1 body, a pipe mouth 11 of the hydrogen storage container 1 is equipped with a pipe mouth flange 12, and a detection mechanism 2 for simulating the corrosion of the inner wall of the hydrogen storage container 1 is provided. The detection mechanism 2 includes an outer tube 21, and the two ends of the outer tube 21 are respectively provided with a flange 1 211 and a flange 212. The inner end of the outer tube 21 is connected to the pipe mouth flange 12 of the pipe mouth 11 of the hydrogen storage container 1 through the flange 1 211, as shown in FIG. Figure 4-5As shown, a plurality of radial ribs 25 are evenly distributed along the radial direction on the inner wall of the outer tube 21. The radial ribs 25 are evenly distributed and form a placement channel. The thin sample tube 22 can be matched and mounted in the placement channel surrounded by the radial ribs 25. At the same time, an independent closed cavity 26 is formed between adjacent radial ribs 25. The radial ribs 25 can support the thin sample tube 22 and provide support strength for the thin sample tube 22. The thin sample tube 22 itself has a thin-walled characteristic, and its side wall thickness is less than the side wall thickness of the hydrogen storage container 1 and the docking fitting tube 23. The thin-walled characteristic of the thin sample tube 22 can make hydrogen easily penetrate its side wall. When hydrogen penetrates from the thin sample tube 22, each closed cavity 26 can independently and evenly capture the permeation amount of hydrogen, and the thin sample tube 22 can be replaced and retained for storage.

[0017] like Figure 3-4 As shown, the docking fitting tube 23 is arranged at the inner end side of the outer tube 21, and the inner end of the docking fitting tube 23 is connected to the inner wall of the flange 211 of the inner end of the outer tube 21, and the docking fitting tube 23 can be connected to the pipe mouth 11 of the hydrogen storage container 1, and an annular baffle 27 is fixed on the outer peripheral side of the docking fitting tube 23, and the outer end of the docking fitting tube 23 is connected to the inner wall of the outer tube 21 through the annular baffle 27, so that a sealed annular cavity 28 is formed between the docking fitting tube 23 and the outer tube 21, and air holes 29 corresponding to each independent closed cavity 26 are opened on the annular baffle 27, and the closed cavity 26 is connected with the annular cavity 28 through the air holes 29, and the hydrogen in each closed cavity 26 can be collected in the annular cavity 28, and detected by the hydrogen probe 24 arranged in the annular cavity 28.

[0018] The material of the docking tube 23 and the thin sample tube 22 is the same as that of the hydrogen storage container 1 , and the diameter of the tube opening 11 of the hydrogen storage container 1 is the same as that of the docking tube 23 and the thin sample tube 22 .

[0019] The thin sample tube 22 can be sealed and docked with the outer end of the docking tube 23. The outer end of the docking tube 23 is provided with a rubber ring 30, so that the docking tube 23 and the thin sample tube 22 are sealed together; the outer tube 21 forms a closed area between the thin sample tube 22 and the outer tube 21 through the flange 1 211 and the flange 2 212 at both ends. The outer tube 21 can protect the thin sample tube 22. The thickness of the outer tube 21 is greater than that of the thin sample tube 22, which can prevent leakage caused by damage to the thin sample tube 22. The outer tube 21 can not only form a closed area to constitute a supporting basis, but also play a safety protection role.

[0020] The hydrogen probe 24 is arranged in the annular cavity 28. The hydrogen probe 24 adopts the existing technology. The hydrogen probe 24 is connected to the controller 31 outside the outer tube 21 by signal. The hydrogen probe 24 can detect the concentration change of hydrogen in the annular cavity 28 in real time to realize automatic data collection and analysis. By detecting the amount of hydrogen permeated from the thin sample tube 22, the controller 31 can analyze the corrosion degree of the inner wall of the hydrogen storage container 1 according to the change trend.

[0021] An auxiliary tube 32 is provided at the outer end of the outer tube 21, and the inner end of the auxiliary tube 32 is connected to the outer tube 21. Figure 2-4 As shown, the flange three 33 at the inner end of the auxiliary tube 32 is connected to the flange two 212 at the outer end of the outer tube 21, and a flange cover 35 is provided on the flange four 34 at the outer end of the auxiliary tube 32, so that the outer end of the auxiliary tube 32 is closed; the auxiliary tube 32 can press the thin sample tube 22 through the flange three 33, so that the outer end of the docking tube 23 is sealed to the left end of the thin sample tube 22, and press the right end of the thin sample tube 22, to ensure that the thin sample tube 22 is sealed and connected with the docking tube 23, to avoid leakage during the detection process, and to ensure that the thin sample tube 22 is stably placed in the channel surrounded by the radial ribs 25, to avoid the movement of the thin sample tube 22 due to external vibration. After the auxiliary tube 32 is disassembled from the outer tube 21, the thin sample tube 22 can be drawn out of the outer tube 21, or replaced and filled with a new thin sample tube 22, and the thin sample tube 22 can be replaced; the flange cover 35 on the flange four 34 of the auxiliary tube 32 can be opened as needed to connect with the external pipeline.

[0022] The material of the thin sample tube 22 is the same as that of the hydrogen storage container 1. The thin sample tube 22 is connected to the hydrogen storage container 1 through the docking fitting tube 23. Through the thin wall characteristics of the thin sample tube 22, hydrogen can penetrate the thin sample tube 22. When the hydrogen in the hydrogen storage container 1 penetrates the thin sample tube 22, hydrogen can be evenly generated in the independent closed cavity 26. At the same time, the hydrogen in each closed cavity 26 is collected in the annular area, and the amount of hydrogen is detected by the hydrogen probe 24. By detecting the hydrogen penetration degree of the thin sample tube 22, the corrosion degree of the inner wall of the hydrogen storage container 1 can be simulated. There is a linear relationship between the hydrogen penetration degree of the thin sample tube 22 and the corrosion degree of the inner wall of the hydrogen storage container 1, so that the thin sample tube 22 synchronously reflects the corrosion degree of the inner wall of the hydrogen storage container 1, and can be retained for a long time to simulate the situation of hydrogen penetration of the hydrogen storage container 1. Specific implementation steps

[0023] The outer tube 21 is connected to the pipe mouth flange 12 of the hydrogen storage container 1 through a flange 211, so that the docking fitting tube 23 can be connected to the inside of the hydrogen storage container 1. The sealing performance of the flange connection ensures the high pressure tolerance of the detection environment and the isolation between the outside world and the hydrogen storage container 1, and is convenient for the rapid installation of the detection mechanism 2. The thin sample tube 22 is placed in the placement channel surrounded by the radial ribs 25, and the thin sample tube 22 is pressed and fixed by the auxiliary tube 32 to ensure its stable position. The thin sample tube 22 can synchronously and accurately simulate the corrosion degree of the inner wall of the hydrogen storage container 1, and its thin wall characteristics ensure sensitive capture of hydrogen permeation behavior; the top pressure of the auxiliary tube 32 prevents the thin sample tube 22 from loosening or leaking. After the detection mechanism 2 is installed, the independent closed cavity 26 and the annular cavity 28 are tested for air tightness to ensure that there is no gas leakage or interference between the cavities and the accuracy of the detection data. The independence of the closed cavity 26 and the integration of the annular cavity 28 can effectively capture the hydrogen permeation behavior of the thin sample tube 22. The hydrogen probe 24 is started and calibrated through the controller 31. The detection sensitivity and accuracy are accurate to ensure that it can accurately detect the change of hydrogen concentration in the annular cavity 28 in real time. The hydrogen storage container 1 is filled with hydrogen and enters a normal working state. The inner wall of the hydrogen storage container 1 gradually corrodes in the hydrogen environment. At the same time, hydrogen will gradually penetrate into the closed cavity 26 through the wall of the thin sample tube 22. The thin sample tube 22 and the inner wall of the hydrogen storage container 1 are synchronously exposed to the same corrosive environment. The amount of hydrogen that penetrates can truly reflect the degree of corrosion of the inner wall of the hydrogen storage container 1. The hydrogen that penetrates outside the thin sample tube 22 is captured by the independent closed cavity 26 and is collected into the annular cavity 28 through the air vents 29 on the annular baffle 27. The hydrogen probe 24 monitors the hydrogen concentration in the annular cavity 28 in real time and transmits the data to the external controller 31. The controller 31 analyzes the degree of corrosion of the inner wall of the hydrogen storage container 1 according to the trend of hydrogen concentration changes. The real-time monitoring of hydrogen concentration realizes dynamic tracking of the degree of corrosion. When the corrosion exceeds the safety threshold, an early warning signal can be issued in time to avoid safety problems caused by corrosion failure of the hydrogen storage container 1.

[0024] By disassembling the auxiliary tube 32, the thin sample tube 22 can be quickly replaced. The thin sample tube 22 is subjected to hydrogen penetration for a long time, and its material properties may change over time, affecting its sensitivity to the corrosion state. Therefore, by regularly replacing the thin sample tube 22, the accuracy of the thin sample tube 22 can be guaranteed. The replaced new thin sample tube 22 can record the corrosion state of the hydrogen storage container 1 in the subsequent time period, while the replaced thin sample tube 22 retains the corrosion record of the hydrogen storage container 1 in the previous time period, ensuring the integrity and traceability of the detection. After the thin sample tube 22 is stored, by analyzing the hydrogen penetration degree of the thin sample tube 22 in different time periods, a historical curve of the corrosion state of the hydrogen storage container 1 can be formed to reflect the long-term corrosion trend of the hydrogen storage container 1.

[0025] Embodiment 2, a hydrogen storage container corrosion detection device in this embodiment is described centering on the differences from Embodiment 1.

[0026] In this embodiment, a ring groove is provided at the outer end of the docking tube 23, and the rubber ring 30 is arranged in the ring groove. A ring end is provided at the end of the thin sample tube 22, and the ring end can be docked in the ring groove, so that the docking tube 23 and the thin sample tube 22 are connected in convex and concave manner.

[0027] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrogen storage container corrosion detection device, comprising a hydrogen storage container, characterized in that: It also includes a detection mechanism, which includes an outer tube, a thin sample tube, a docking tube and a hydrogen probe. The end of the outer tube is connected to the pipe mouth flange of the hydrogen storage container, and radial ribs are evenly distributed on the inner wall of the outer tube in the radial direction. The thin sample tube is matched and fitted in the placement channel surrounded by the radial ribs, and an independent closed cavity is formed between adjacent radial ribs; the docking tube is arranged on the inner end side of the outer tube and communicated with the pipe mouth of the hydrogen storage container, and the annular baffle on the outer peripheral side of the docking tube is fixedly connected to the inner wall of the outer tube, so that a sealed annular cavity is formed between the docking tube and the outer tube, and the closed cavity is connected to the annular cavity through the air vents of the annular baffle; the thin sample tube can be sealed and docked with the end of the docking tube; The hydrogen probe is arranged in the annular cavity, and the hydrogen probe is connected to the external controller signal, and an auxiliary tube for pressing the thin sample tube is arranged at the outer end of the outer tube, and the outer end of the auxiliary tube is closed; the thin sample tube is connected to the hydrogen storage container through the docking matching tube, and hydrogen can penetrate the thin sample tube through the thin wall characteristics of the thin sample tube. When the hydrogen in the hydrogen storage container penetrates the thin sample tube, hydrogen can be uniformly generated in an independent closed cavity. At the same time, the hydrogen in each closed cavity is collected in the annular area, and the amount of hydrogen is detected by the hydrogen probe. By detecting the hydrogen penetration degree of the thin sample tube, the corrosion degree of the inner wall of the hydrogen storage container can be simulated, so that the thin sample tube can synchronously reflect the corrosion degree of the inner wall of the hydrogen storage container.

2. A hydrogen storage container corrosion detection device according to claim 1, characterized in that: The inner end of the butt-joint pipe is connected to a flange at the inner end of the outer pipe, and the annular baffle is arranged at the outer end of the butt-joint pipe.

3. A hydrogen storage container corrosion detection device according to claim 1, characterized in that: The flange three at the inner end of the auxiliary pipe is connected to the flange two at the outer end of the outer pipe correspondingly, and a flange cover is arranged on the flange four at the outer end of the auxiliary pipe.

4. A hydrogen storage container corrosion detection device according to claim 1, characterized in that: The outer end of the butt-joint tube is provided with a rubber ring, which can cooperate with the thin sample tube for sealing.

5. A hydrogen storage container corrosion detection device according to claim 1, characterized in that: The diameter of the tube mouth of the hydrogen storage container is the same as the diameter of the butt-fit tube and the thin sample tube.

6. A hydrogen storage container corrosion detection device according to claim 1, characterized in that: The material of the butt-jointed tube and the thin sample tube is the same as that of the hydrogen storage container.

7. A hydrogen storage container corrosion detection device according to claim 1, characterized in that: A closed area is formed between the thin sample tube and the outer tube, and the outer tube can protect the thin sample tube.

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