A bimetallic clad plate pressure vessel internal corrosion monitoring structure and method
By setting a bimetallic composite plate structure inside the pressure vessel, with the inner section being the same as the outer section coated with an anti-corrosion layer and equipped with blind holes and through holes, the problem of accuracy in corrosion detection inside the composite plate pressure vessel was solved, and high-precision corrosion rate calculation was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA NAT PETROLEUM CORP
- Filing Date
- 2024-12-24
- Publication Date
- 2026-06-26
AI Technical Summary
The corrosion inside existing composite plate pressure vessels is difficult to detect accurately, and the detection results are limited by the shape of the pressure vessel, resulting in large errors.
A bimetallic composite plate corrosion monitoring structure for pressure vessels is adopted, consisting of an inner section and an outer section. The inner section is the same as the inner layer of the pressure vessel, while the outer section covers the inner wall and is coated with an anti-corrosion layer. Blind holes and through holes are provided on the inner section to simulate the environment inside the pressure vessel. The corrosion is detected by removing the inner section.
This improved the accuracy and precision of corrosion detection, reduced errors in detection results, and avoided impacting the normal operation of pressure vessels.
Smart Images
Figure CN122282601A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of oilfield equipment monitoring technology, and specifically relates to a structure and method for monitoring corrosion inside a bimetallic composite plate pressure vessel. Background Technology
[0002] Pressure vessels are one of the most important pieces of equipment in the oil and gas field. They are generally made of corrosion-resistant composite plates. However, after a period of operation, corrosion can still occur on the inner side of the composite plates. Due to the multi-layered structure of the composite plates, the corrosion is difficult to detect. Therefore, it is necessary to make timely judgments on the corrosion status and rate, which is of great significance to ensuring safe operation.
[0003] Existing composite plate pressure vessels typically determine the presence of corrosion by directly observing or inspecting the inner surface after opening the pressure vessel. After multiple observations or inspections, the corrosion rate of the inner surface can be determined by comparison. However, after each observation or inspection using this method, if corrosion pits are found on the inner surface of the pressure vessel, they are usually ground or repaired by welding after the inspection to avoid affecting the subsequent normal operation of the pressure vessel. This makes it difficult to accurately determine the corrosion rate of the inner surface of the pressure vessel. Furthermore, even if grinding or welding is not performed after inspection, the shape of the pressure vessel itself, and the need to inspect inside the pressure vessel, inevitably introduces some error into the corrosion detection results, thus affecting the accuracy of calculating the corrosion rate of the inner surface of the pressure vessel.
[0004] Therefore, it is difficult to accurately detect the internal corrosion of pressure vessels made of existing composite plates. Summary of the Invention
[0005] To address the above problems, this invention proposes a corrosion monitoring structure and method for bimetallic composite plate pressure vessels. The corrosion monitoring structure for bimetallic composite plate pressure vessels includes:
[0006] The inner section is suspended inside the pressure vessel;
[0007] The thickness of the inner layer is the same as the thickness of the inner layer of the pressure vessel;
[0008] An outer layer segment, which covers and is disposed on the inner sidewall of the inner layer segment;
[0009] The outer wall of the outer layer is coated with an anti-corrosion layer;
[0010] Blind holes and through holes are provided adjacently on the outer side wall of the inner layer segment, and the end of the through hole near the outer layer segment abuts against the inner side wall of the outer layer segment.
[0011] In some specific embodiments, the top end of the inner layer segment is a connecting end, and the bottom end of the inner layer segment is an etched end;
[0012] The blind hole and the through hole are formed on one outer side wall of the corroded end of the inner layer section;
[0013] The width of the connecting end of the inner layer segment is smaller than the width of the etched end of the inner layer segment.
[0014] In some specific embodiments, the outer layer segment covers the inner sidewall of the corroded end of the inner layer segment.
[0015] In some specific embodiments, the anti-corrosion layer is made of resin.
[0016] In some specific embodiments, the inner layer segment is made of stainless steel;
[0017] The outer layer is made of carbon steel.
[0018] In some specific embodiments, the width of the connecting end of the inner layer segment is greater than or equal to 10 mm;
[0019] The length of the connecting end of the inner layer segment is greater than or equal to 40 mm.
[0020] In some specific embodiments, there are multiple blind holes, which are evenly arranged among each other;
[0021] The depth dimensions of the multiple blind holes are different.
[0022] In some specific embodiments, the difference between the depth dimensions of any two blind holes is greater than or equal to 1 mm.
[0023] A method for monitoring corrosion inside a bimetallic composite plate pressure vessel, based on the same concept, employs the bimetallic composite plate corrosion monitoring structure as described in any of the above specific embodiments, and includes the following steps:
[0024] The inner section, which is covered by the outer section, is hung inside the pressure vessel, so that the blind holes and through holes on the inner section are exposed inside the pressure vessel.
[0025] Start the pressure vessel and bring it into operation for a preset time.
[0026] Stop the operation of the pressure vessel and remove the inner section that covers the outer section on the inner wall. Obtain the pitting corrosion development rate of the pressure vessel through the blind holes on the inner section and obtain the galvanic corrosion rate of the pressure vessel through the through holes on the inner section.
[0027] In some specific embodiments, the inner layer section, which is covered by the outer layer section, is hung inside the pressure vessel, so that the blind holes and through holes on the inner layer section are exposed inside the pressure vessel, and then the anti-corrosion layer on the outer wall of the outer layer section is repaired and coated.
[0028] The bimetallic composite plate corrosion monitoring structure for pressure vessels of this invention simulates the inner layer of the pressure vessel's composite plate and places it in the same environment by using an inner layer segment with the same thickness as the inner layer of the pressure vessel, which is suspended inside the pressure vessel. An outer layer segment covering the inner wall of the inner layer segment and an anti-corrosion layer coated on the outer wall of the outer layer segment simulate the composite structure of the pressure vessel's composite plate. When the pressure vessel is in operation, the inner layer segment is corroded under the same conditions as the inner layer of the pressure vessel inside the pressure vessel. By removing the inner layer segment from the pressure vessel, the corrosion of blind holes and through holes on the inner layer segment can be observed or detected. Because there is no need to grind or weld the inner layer segment for repair, the corrosion status of the pressure vessel's inner layer can be deduced from the corrosion status of the inner layer segment, thus determining the corrosion rate of the pressure vessel's inner layer, without affecting the subsequent normal operation of the pressure vessel. Furthermore, by shifting the observation or detection scenario from inside the pressure vessel to outside the pressure vessel, the shape limitations of the pressure vessel itself are overcome, greatly reducing the error of the detection results and ensuring the accuracy of the calculated corrosion rate of the pressure vessel's inner layer.
[0029] The corrosion monitoring method for bimetallic composite plate pressure vessels of the present invention has the same beneficial effects as the aforementioned corrosion monitoring structure for bimetallic composite plate pressure vessels, and therefore will not be described again here.
[0030] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 A schematic diagram of a corrosion monitoring structure inside a bimetallic composite plate pressure vessel according to an embodiment of the present invention is shown.
[0033] Figure 2A schematic diagram of the inner layer segment in an embodiment of the present invention is shown;
[0034] Figure 3 A flowchart of a corrosion monitoring method for bimetallic composite plate pressure vessels according to an embodiment of the present invention is shown.
[0035] In the diagram, 100 is the inner layer section; 110 is the connecting plate; 120 is the test plate; 121 is the blind hole; 122 is the through hole; and 200 is the outer layer section. Detailed Implementation
[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0037] Reference Figure 1 This invention provides a corrosion monitoring structure for a bimetallic composite plate pressure vessel, comprising an inner section 100 and an outer section 200. The inner section 100 is suspended inside the pressure vessel. The thickness of the inner section 100 is the same as the thickness of the inner layer of the pressure vessel. The outer section 200 is disposed on the inner sidewall of the inner section 100. An anti-corrosion layer is coated on the outer sidewall of the outer section 200. Blind holes 121 and through holes 122 are adjacently formed on the outer sidewall of the inner section 100, with one end of the through hole 122 abutting against the inner sidewall of the outer section 200.
[0038] Specifically, the bottom end of the inner layer section 100 is inserted into the pressure vessel, and the top end of the inner layer section 100 can be fixedly connected to the internal components of the pressure vessel. This allows the bottom end of the inner layer section 100 inserted into the pressure vessel to hang inside, ensuring that the inner layer section 100 is in the same environment as the inner layer of the pressure vessel. The thickness of the inner layer section 100 is the same as the thickness of the inner layer of the pressure vessel, thus simulating the inner layer of the pressure vessel under the same environment. This makes the corrosion effect of the inner layer section 100 similar to or even identical to that of the inner layer of the pressure vessel, thereby improving the accuracy of the test results. The outer layer 200 covers the inner wall of the inner layer 100, and the outer wall of the outer layer 200, i.e. the part that does not contact the inner layer 100, is coated with an anti-corrosion layer. This simulates the composite structure of the pressure vessel and ensures the accuracy of the test. By coating the outer wall of the outer layer 200, i.e. the part that does not contact the inner layer 100, with an anti-corrosion layer, the situation where the outer layer 200 corrodes preferentially over the inner layer 100 can be avoided, thus preventing any impact on the accuracy of the test results. Blind holes 121 and through holes 122 are provided on the outer side wall of the inner layer section 100 that does not contact the outer layer section 200. The blind holes 121 and through holes 122 are arranged adjacent to each other. The end of the through hole 122 near the outer layer section 200 can abut against the outer wall of the outer layer section 200 near the inner side wall of the inner layer section 100. Thus, by observing or detecting the corrosion rate of the blind hole 121, the pitting corrosion rate of the inner layer of the pressure vessel can be obtained, and by observing or detecting the through hole 122, the galvanic corrosion rate of the inner layer of the pressure vessel can be obtained. When the pressure vessel is in operation, the through holes 122 and blind holes 121 of the inner section 100 can be corroded under the same conditions as the inner layer of the pressure vessel inside the pressure vessel. The corrosion of the blind holes 121 and through holes 122 on the inner section 100 can be observed or detected by removing the inner section 100 from the pressure vessel. Since there is no need to grind or weld repairs to the blind holes 121 and through holes 122 of the inner section 100, the corrosion status of the inner layer of the pressure vessel can be deduced from the corrosion status of the inner section 100, thus determining the corrosion rate of the inner layer of the pressure vessel, without affecting the subsequent normal operation of the pressure vessel. Furthermore, by shifting the observation or detection scenario from inside the pressure vessel to outside the pressure vessel, the shape limitations of the pressure vessel itself are overcome, greatly reducing the error of the detection results and ensuring the accuracy of the calculated corrosion rate of the inner layer of the pressure vessel.
[0039] In some specific embodiments of the present invention, reference is made to... Figure 2 The top end of the inner layer segment 100 is the connecting end, and the bottom end of the inner layer segment 100 is the etching end. Blind holes 121 and through holes 122 are formed on the outer wall of the etching end of the inner layer segment 100. The width of the connecting end of the inner layer segment 100 is smaller than the width of the etching end of the inner layer segment 100.
[0040] Specifically, the inner layer section 100 includes a connecting plate 110 and a test plate 120. The bottom end of the connecting plate 110 is fixedly connected to the top end of the test plate 120, thus forming the connecting end of the inner layer section 100 through the connecting plate 110 and the corrosion end of the inner layer section 100 through the test plate 120. The connecting plate 110 can be connected to the internal components of the pressure vessel, thereby allowing the test plate 120 to be entirely mounted inside the pressure vessel. Blind holes 121 and through holes 122 are formed on the outer wall of the test plate 120, allowing them to also be located inside the pressure vessel. Furthermore, the width of the connecting plate 110 is smaller than the width of the test plate 120, facilitating connection to the internal components of the pressure vessel and preventing the connecting plate 110 from occupying too much space due to its excessive width, which could affect the normal operation of the pressure vessel.
[0041] Furthermore, the connecting plate 110 and the test plate 120 are an integral structure, which ensures the stability of the connection.
[0042] Furthermore, the connecting plate 110 is detachably connected to the internal components of the pressure vessel by bolts or screws, thereby facilitating installation and disassembly. Alternatively, the connecting plate 110 is connected to the internal components of the pressure vessel by welding, thereby ensuring the stability of the installation.
[0043] In some specific embodiments of the present invention, reference is made to... Figure 1 The outer layer 200 covers the inner wall of the corroded end of the inner layer 100 away from the blind hole 121. Specifically, the outer layer 200 covers the inner wall of the test plate 120 away from the blind hole 121, that is, the outer layer 200 does not cover the connecting plate 110. This facilitates the connection between the connecting plate 110 and the internal components of the pressure vessel, and also avoids the heat generated during the welding connection between the connecting plate 110 and the internal components of the pressure vessel from affecting the corrosion resistance of the outer layer 200.
[0044] It should be noted that when processing and installing the outer layer segment 200, it can first be wrapped around the inner layer segment 100 for connection. Then, the outer layer segment 200 and the inner layer segment 100 can be cut together using a cutting device, so that the two ends of the inner layer segment 100 form the connecting plate 110 and the test plate 120, respectively. At this time, the outer layer segment 200 is also wrapped around the inner sidewall of the connecting plate 110. Only the part of the outer layer segment 200 that wraps around the connecting plate 110 needs to be ground using a grinding device, so that the outer layer segment 200 only wraps around the inner sidewall of the test plate 120. This reduces the processing difficulty and facilitates assembly.
[0045] Furthermore, the outer layer 200 and the inner layer 100 are connected by a metallurgical bonding method, thereby forming an integral structure between the outer layer 200 and the inner layer 100. Then, the outer layer 200 on the inner sidewall of the test plate 120 of the inner layer 100 can be ground off by grinding the integrated outer layer 200 and inner layer 100.
[0046] Furthermore, the combination of the outer layer 200 and the inner layer 100 can directly use the same composite plate as the monitored bimetallic composite plate pressure vessel, which is convenient for processing and utilization.
[0047] In some specific embodiments of the present invention, the anti-corrosion layer is made of resin. After the outer layer 200 is connected to the test plate 120, resin is applied to each side of the outer layer 200 that is not in contact with the test plate 120, thereby forming an anti-corrosion layer on the outer wall of the outer layer 200. This prevents the outer layer 200 from corroding preferentially over the inner layer 100, thus avoiding affecting the accuracy of the test results. Resin is easy to apply and inexpensive.
[0048] It should be noted that when the connecting plate 110 is welded to the internal components of the pressure vessel, the anti-corrosion layer is easily damaged by the heat generated during the welding process. Forming an anti-corrosion layer with resin allows for further resin application after the connecting plate 110 is connected to the internal components, thus repairing any damaged anti-corrosion layer and ensuring the corrosion resistance of the outer layer 200.
[0049] In some specific embodiments of the present invention, the inner layer 100 is made of stainless steel, and the outer layer 200 is made of carbon steel. By using the stainless steel connecting plate 110 and the test plate 120, the properties of the inner layer 100 can be made the same as those of the inner layer material of the pressure vessel, and by using the carbon steel outer layer 200, the properties of the outer layer 200 can be made the same as those of the outer layer material of the pressure vessel. This improves the accuracy of the detection structure and ensures the accuracy of the calculation of the corrosion rate of the inner layer of the pressure vessel.
[0050] It should be noted that when a composite plate of the same material as the bimetallic composite plate pressure vessel being monitored is used directly, the inner layer section 100 and the outer layer section 200 can be made to be completely identical to the inner and outer layers of the pressure vessel, thereby improving the accuracy of the test results.
[0051] In some specific embodiments of the present invention, reference is made to... Figure 2The width of the connecting end of the inner layer section 100 is greater than or equal to 10 mm. The length of the connecting end of the inner layer section 100 is greater than or equal to 40 mm. Specifically, the width of the connecting plate 110 is smaller than the width of the test plate 120, which limits the size of the connecting plate 110 and facilitates its connection with the internal components of the pressure vessel. However, the length of the connecting plate 110 is greater than or equal to 40 mm, ensuring that the connecting plate 110 has sufficient length so that the connection point between the connecting plate 110 and the internal components of the pressure vessel is far away from the test plate 120 and the outer layer section 200. This prevents the heat generated during welding of the connecting plate 110 to the internal components of the pressure vessel from affecting the corrosion resistance of the outer layer section 200. At the same time, the width of the connecting plate 110 is greater than or equal to 10 mm, ensuring that the connecting plate 110 has sufficient space for connection and ensuring the stability of the connection between the connecting plate 110 and the internal components of the pressure vessel, thereby improving the stability of the test plate 120.
[0052] In some specific embodiments of the present invention, reference is made to... Figure 2 Multiple blind holes 121 are evenly distributed and arranged. The depths of the multiple blind holes 121 are different. Specifically, the multiple blind holes 121 are all formed on the outer wall of the test plate 120 away from the outer layer section 200, and are evenly distributed and adjacent to each other. Since the depths of the multiple blind holes 121 are all different, the corrosion rates of pitting corrosion of different sizes in the inner layer of the pressure vessel can be obtained by observing or detecting multiple blind holes 121 of different depths. This improves the richness of the detection structure, further reduces the error of the detection results, and ensures the accuracy of the calculated corrosion rate of the inner layer of the pressure vessel.
[0053] In some specific embodiments of the present invention, reference is made to... Figure 2 The difference in depth between any two blind holes 121 is greater than or equal to 1 mm. Multiple blind holes 121 have different depth dimensions, and the difference in depth between any two blind holes 121 is greater than or equal to 1 mm; that is, the minimum difference in depth dimension between the two blind holes 121 with the closest depth dimensions is 1 mm. This ensures the accuracy of the corrosion rate calculation for the inner layer of the pressure vessel. If the difference in depth dimension between multiple blind holes 121 is too large, it will affect the accuracy of the detection results; if the difference in depth dimension between multiple blind holes 121 is too small, that is, less than 1 mm, it will be difficult to distinguish the degree of corrosion among the multiple blind holes 121.
[0054] It should be noted that the difference between the depth dimensions of any two blind holes 121 can also be set according to the actual pitting depth of the pressure vessel and the monitoring requirements.
[0055] Reference Figure 3 The present invention also provides a method for monitoring corrosion inside a bimetallic composite plate pressure vessel, employing the bimetallic composite plate corrosion monitoring structure described in any of the above specific embodiments, comprising the following steps: An inner layer section 100, with its inner wall covered by an outer layer section 200, is hung inside the pressure vessel, exposing the blind holes 121 and through holes 122 on the inner layer section 100 within the pressure vessel. The pressure vessel is started and kept in operation for a preset time. The operation of the pressure vessel is stopped, and the inner layer section 100 with its inner wall covered by the outer layer section 200 is removed. The pitting corrosion development rate of the pressure vessel is obtained through the blind holes 121 on the inner layer section 100, and the galvanic corrosion rate of the pressure vessel is obtained through the through holes 122 on the inner layer section 100.
[0056] Specifically, the internal components of the pressure vessel are removed, and the end of the connecting plate 110 furthest from the test plate 120 is welded and fixed to the internal components of the pressure vessel. The test plate 120 is then inserted into the pressure vessel, and the internal components are reinstalled, thus suspending the test plate 120 inside the pressure vessel. This exposes multiple blind holes 121 and through holes 122 on the outer wall of the test plate 120 within the pressure vessel. After a preset time period following normal operation of the pressure vessel, the test plate 120 is removed from the pressure vessel along with the internal components. The junction between the connecting plate 110 and the test plate 120 is then cut to obtain the test plate 120 separately. The corrosion status of the multiple blind holes 121 and through holes 122 on the test plate 120 is then observed or inspected. The corrosion rates of pitting corrosion of various sizes in the inner layer of the pressure vessel are obtained by observing the corrosion of multiple blind holes 121. Since the end of the through hole 122 near the outer layer section 200 abuts against the outer wall of the outer layer section 200, the galvanic corrosion rate of the inner layer of the pressure vessel can be obtained by observing the corrosion of the through hole 122. When the pressure vessel is running, the blind holes 121 and through holes 122 on the test plate 120 can be corroded under the same conditions as the inner layer of the pressure vessel inside the pressure vessel. After the test is completed, there is no need to grind or repair the test plate 120 by welding. The corrosion of the blind holes 121 and through holes 122 can be observed or detected, and the corrosion of the inner layer of the pressure vessel can be deduced without affecting the subsequent normal operation of the pressure vessel, so as to determine the corrosion rate of the inner layer of the pressure vessel. At the same time, by moving the observation or detection scene from inside the pressure vessel to outside the pressure vessel, the shape limitation of the pressure vessel itself is overcome, which can greatly reduce the error of the detection results, thereby ensuring the accuracy of the calculation of the corrosion rate of the inner layer of the pressure vessel.
[0057] In some specific embodiments of the present invention, the inner layer 100, whose inner wall is covered by the outer layer 200, is suspended inside the pressure vessel, exposing the blind holes 121 and through holes 122 on the inner layer 100 inside the pressure vessel. Then, the anti-corrosion layer on the outer wall of the outer layer 200 is repaired and coated. Specifically, after the test plate 120 is suspended inside the pressure vessel, the portion of the anti-corrosion layer damaged by the heat generated during the welding connection of the connecting plate 110 to the internal components of the pressure vessel is recoated with resin, thereby repairing the damaged anti-corrosion layer. This ensures the corrosion resistance of the outer layer 200, preventing the outer layer 200 from corroding before the test plate 120, and avoiding affecting the accuracy of the test results.
[0058] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A corrosion monitoring structure for a bimetallic composite plate pressure vessel, characterized in that, include: Inner section (100), the inner section (100) is installed inside the pressure vessel; The thickness of the inner layer section (100) is the same as the thickness of the inner layer of the pressure vessel; An outer layer segment (200) is disposed on the inner sidewall of the inner layer segment (100); The outer wall of the outer section (200) is coated with an anti-corrosion layer; The inner layer segment (100) has a blind hole (121) and a through hole (122) adjacent to each other on its outer sidewall. The end of the through hole (122) near the outer layer segment (200) abuts against the inner sidewall of the outer layer segment (200).
2. The corrosion monitoring structure for bimetallic composite plate pressure vessels according to claim 1, characterized in that, The top end of the inner layer segment (100) is a connecting end, and the bottom end of the inner layer segment (100) is an etching end; The blind hole (121) and the through hole (122) are formed on one outer side wall of the corroded end of the inner layer section (100); The width of the connecting end of the inner layer segment (100) is smaller than the width of the etched end of the inner layer segment (100).
3. The corrosion monitoring structure for bimetallic composite plate pressure vessels according to claim 2, characterized in that, The outer layer (200) covers the inner sidewall of the corroded end of the inner layer (100).
4. The corrosion monitoring structure for bimetallic composite plate pressure vessels according to claim 2, characterized in that, The anti-corrosion layer is made of resin.
5. The corrosion monitoring structure for bimetallic composite plate pressure vessels according to any one of claims 1 to 4, characterized in that, The inner layer section (100) is made of stainless steel; The outer layer (200) is made of carbon steel.
6. The corrosion monitoring structure for bimetallic composite plate pressure vessels according to any one of claims 2 to 4, characterized in that, The width of the connecting end of the inner layer segment (100) is greater than or equal to 10 mm; The length of the connecting end of the inner layer segment (100) is greater than or equal to 40 mm.
7. The corrosion monitoring structure for bimetallic composite plate pressure vessels according to any one of claims 1 to 4, characterized in that, There are multiple blind holes (121), and the multiple blind holes (121) are evenly arranged among each other; The depth dimensions of the multiple blind holes (121) are different.
8. The corrosion monitoring structure for bimetallic composite plate pressure vessels according to claim 7, characterized in that, The difference between the depth dimensions of any two blind holes (121) is greater than or equal to 1 mm.
9. A method for monitoring corrosion inside a bimetallic composite plate pressure vessel, comprising the corrosion monitoring structure for bimetallic composite plate pressure vessels as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The inner section (100), whose inner wall is covered by the outer section (200), is hung inside the pressure vessel, so that the blind hole (121) and through hole (122) on the inner section (100) are exposed inside the pressure vessel; Start the pressure vessel and bring it into operation for a preset time. Stop the operation of the pressure vessel and remove the inner section (100) that is covered by the outer section (200) on the inner wall. Obtain the pitting corrosion development rate of the pressure vessel through the blind hole (121) on the inner section (100) and obtain the galvanic corrosion rate of the pressure vessel through the through hole (122) on the inner section (100).
10. The method for monitoring corrosion inside a bimetallic composite plate pressure vessel according to claim 9, characterized in that, The inner section (100), which is covered by the outer section (200) on the inner sidewall, is hung inside the pressure vessel. After the blind hole (121) and through hole (122) on the inner section (100) are exposed inside the pressure vessel, the anti-corrosion layer on the outer sidewall of the outer section (200) is repaired and coated.