Supercritical CO2 corrosion testing device
By setting rigid insulated pipe fittings in the supercritical CO2 corrosion test device to provide radial constraints on the heating parts, the problem of uneven sample temperature under high temperature and high pressure is solved, and efficient and safe corrosion testing is achieved.
Patent Information
- Application Number
- CN202510578726.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-06
- Publication Date
- 2025-08-08
AI Technical Summary
The existing supercritical CO2 corrosion testing device is difficult to simulate the corrosion of structural materials under high temperature and high pressure environments, resulting in low test temperature and uneven sample temperature, making it difficult to accurately conduct corrosion testing.
A supercritical CO2 corrosion test device is designed, including a shell piece, a heating piece, a heat insulating piece and a rigid insulating pipe fitting. By setting a rigid insulating pipe fitting between the heating piece and the heat insulating piece, it provides radial constraints to avoid deformation of the heating piece, and directly heat the sample with heat radiation to improve heating efficiency and temperature uniformity.
Accurate corrosion testing of multiple samples under high temperature and high pressure is achieved, the test temperature is improved, the structural stability and safety of the shell is ensured, the design difficulty is simplified, and the sample removal and temperature control are facilitated.
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Figure CN120445962A_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the technical field of material corrosion testing, and in particular to a supercritical CO2 corrosion testing device. Background Art
[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.
[0003] The supercritical carbon dioxide Brayton power conversion system is a next-generation power generation technology widely used in reactor systems due to its high cycle efficiency and compact size. During system operation, supercritical CO₂ can reach temperatures as high as 1000°C and pressures as high as 30 MPa. This can cause uniform corrosion reactions between the system's structural materials and the supercritical CO₂, such as high-temperature oxidation and permeation, which can affect the system's safe operation.
[0004] To evaluate the corrosion performance of a system's structural materials in a supercritical CO2 environment, corrosion tests are typically performed using a supercritical CO2 corrosion tester to simulate the material's service conditions. However, existing supercritical CO2 corrosion testers struggle to simulate the effects of supercritical CO2 on structural materials under certain operating conditions. Summary of the Invention
[0005] A brief overview of the present application is provided below to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify key or important portions of the present application, nor is it intended to limit the scope of the present application. Its purpose is simply to present certain concepts in a simplified form as a prelude to the more detailed description that will be discussed later.
[0006] An embodiment of the present application provides a supercritical CO2 corrosion testing device, comprising: a shell, a heater, a thermal insulation member, and a rigid insulating tube. The heater is disposed within the shell, configured to form a heating space for accommodating multiple specimens and to heat the heating space to a preset temperature; the thermal insulation member is disposed between the shell and the heater, configured to reduce heat transferred from the heater to the shell; the rigid insulating tube is disposed between the heater and the thermal insulation member; wherein the shell is provided with an inlet port for high-pressure supercritical CO2 gas to enter the heating space and an outlet port for high-pressure supercritical CO2 gas to flow out of the heating space; the heater spirally extends radially inwardly of the rigid insulating tube, abutting against the inner wall of the rigid insulating tube, so that the inner wall of the rigid insulating tube provides radial constraint on the heater.
[0007] In order to increase the test temperature and avoid the temperature of the shell being too high, in an embodiment of the present application, the heating element directly forms a heating space for accommodating multiple samples, that is, no other rigid support pipes are provided on the inner side of the heating element, so that the sample rack loaded with multiple samples can be directly placed in the heating space formed by the heating element, so that the heating element heats the samples by heat radiation. Since the heat of the heating element can be directly radiated to the samples, the heating efficiency is greatly improved, which is conducive to increasing the test temperature; since a heat insulating element is provided between the shell and the heating element, the heat transferred from the heating element to the shell is effectively reduced, and the shell can maintain a lower temperature when the heating element is high, ensuring that the shell can maintain a higher allowable stress, reducing the difficulty of the structural design of the shell.
[0008] The inventors of the present application discovered that when the heating element directly forms a heating space for accommodating multiple samples, since there is no structure on the inside of the heating element to support it, when the heating element operates in a high-temperature and high-pressure supercritical CO2 environment, the heating element will become soft, causing its spiral structure to deform and collapse irregularly in the radial direction. On the one hand, this will make it difficult to remove the samples, and on the other hand, it will also cause differences in the actual temperatures of each sample, making it difficult to accurately perform corrosion tests on multiple samples at a specific temperature. The embodiment of the present application arranges a rigid insulating tube between the heating element and the thermal insulation element, and the heating element is spirally extended to abut against the inner wall of the rigid insulating tube on the radial inside of the rigid insulating tube, so that the inner wall of the rigid insulating tube provides radial constraints to the heating element. Since the rigid insulating tube provides radial constraints to the heating element on the radial outside of the heating element, the deformation and collapse of the heating element can be avoided, thereby facilitating sampling and ensuring that multiple samples are corroded at the same temperature. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present application.
[0010] Figure 1 1 is a schematic cross-sectional view of a supercritical CO2 corrosion testing device according to one embodiment of the present application.
[0011] Description of reference numerals:
[0012] 1. Corrosion testing device;
[0013] 10. Shell; 11. Cover; 12. Tubular body; 121. Connecting portion; 122. Extending portion; 13. Connecting member; 14. Accommodating cavity; 15. Sealing member;
[0014] 20. Heating element; 21. Heating space; 22. Spiral segment; 23. Straight segment;
[0015] 30. Thermal insulation;
[0016] 40. Rigid insulating pipe fittings;
[0017] 50. Temperature measuring parts;
[0018] 60. Cooling parts;
[0019] 70. Specimen holder;
[0020] 80. Sample.
[0021] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION
[0022] Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. For the sake of clarity and conciseness, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary depending on the implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is a routine task for those skilled in the art who benefit from the content of this application.
[0023] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, the accompanying drawings only show the device structure and / or processing steps that are closely related to the solution according to the present application, while other details that are not closely related to the present application are omitted.
[0024] In the related art, in order to prevent supercritical CO2 from corroding other components, a separate sealed container is usually provided for the circulation of supercritical CO2 and for placing samples, and a heating element is used to heat the samples outside the sealed container.
[0025] In some cases, it is necessary to simulate the environmental conditions of supercritical CO2 with high temperature (such as around 1000°C) and high pressure (20-30MPa). However, in the related art, when a heating element is used to heat the sample to a temperature of around 1000°C, the heat is conducted to the inside of the sealed container, so the actual temperature of the sealed container will be higher than the sample temperature. The inventors of this application found that if the temperature of the sealed container is too high, the allowable stress of its material will be significantly reduced, thereby increasing the difficulty of the structural design of the sealed container. Therefore, the test temperature of the supercritical CO2 corrosion test in the related art (around 650°C) is relatively low.
[0026] Based on this, an embodiment of the present application provides a supercritical CO2 corrosion testing device.
[0027] Figure 1 FIG. 1 is a cross-sectional view of a supercritical CO2 corrosion testing device 1 according to an embodiment of the present application. Figure 1 As shown, the supercritical CO2 corrosion testing device 1 includes: a shell 10, a heating element 20, a thermal insulation element 30, and a rigid insulating tube 40. The heating element 20 is disposed in the shell 10 and is configured to form a heating space 21 for accommodating a plurality of specimens 80 and to heat the heating space 21 to a preset temperature; the thermal insulation element 30 is disposed between the shell 10 and the heating element 20 to reduce the amount of heat transferred from the heating element 20 to the shell 10; the rigid insulating tube 40 is disposed between the heating element 20 and the thermal insulation element 30; wherein the shell 10 is provided with an inlet port for allowing high-pressure supercritical CO2 gas to enter the heating space 21 and an outlet port for allowing high-pressure supercritical CO2 gas to flow out of the heating space 21; the heating element 20 spirally extends radially inwardly of the rigid insulating tube 40, abutting against the inner wall of the rigid insulating tube 40, so that the inner wall of the rigid insulating tube 40 provides radial constraint to the heating element 20.
[0028] In order to increase the test temperature and avoid the temperature of the shell 10 being too high, in an embodiment of the present application, the heating element 20 directly forms a heating space 21 for accommodating multiple specimens 80, that is, no other rigid support pipe is provided on the inner side of the heating element 20, so that the specimen holder 70 loaded with multiple specimens 80 can be directly placed in the heating space 21 formed by the heating element 20, so that the heating element 20 heats the specimen 80 by heat radiation. Since the heat of the heating element 20 can be directly radiated to the specimen 80, the heating efficiency of the heating element 20 on the specimen 80 is greatly improved, which is conducive to increasing the test temperature; since the thermal insulation member 30 is provided between the shell 10 and the heating element 20, the heat transferred from the heating element 20 to the shell 10 is effectively reduced, so that the shell 10 can maintain a lower temperature when the heating element 20 is high, ensuring that the shell 10 can maintain a higher allowable stress, reducing the difficulty of the structural design of the shell 10.
[0029] The inventors of this application discovered that when the heater 20 directly forms the heating space 21 for accommodating multiple specimens 80, due to the lack of structural support inside the heater 20, the heater 20 softens when operating in a high-temperature, high-pressure supercritical CO2 environment, causing its spiral structure to deform and collapse irregularly in the radial direction. This can make it difficult to remove the specimens 80 and also lead to differences in the actual temperatures of each specimen 80, making it difficult to accurately perform corrosion testing on multiple specimens 80 at a specific temperature. In an embodiment of the present application, a rigid insulating tube 40 is provided between the heater 20 and the thermal insulation member 30. The heater 20 is spirally extended radially inwardly of the rigid insulating tube 40, abutting against the inner wall of the rigid insulating tube 40. This provides radial restraint on the heater 20 by the inner wall of the rigid insulating tube 40. Because the rigid insulating tube 40 provides radial restraint on the heater 20 radially outwardly, deformation and collapse of the heater 20 are prevented, thereby facilitating sampling and ensuring that multiple specimens 80 are subjected to corrosion testing at the same temperature.
[0030] In addition, the rigid insulating tube 40 can also play an insulating role to prevent the heating element 20 from leaking electricity, thereby improving the safety of corrosion testing on multiple specimens 80.
[0031] In some embodiments, the preset temperature is set to be higher than 650°C, for example 900°C-1000°C, to ensure that the temperature of the heating space 21 can reach the actual operating temperature of supercritical CO2 in the nuclear power conversion system, thereby meeting the temperature requirements of the supercritical CO2 corrosion test.
[0032] In some embodiments, the length of the heating element 20 is less than the length of the rigid insulating tube 40, and the heating element 20 is arranged in the middle of the rigid insulating tube 40 to reduce the heat dissipation of the heating element 20 to the axial ends of the shell 10, thereby avoiding excessively high temperatures at the axial ends of the shell 10, which would significantly reduce its allowable stress.
[0033] In some embodiments, the heating element 20 includes a spiral segment 22 and a straight segment 23 connected to the spiral segment 22. The straight segment 23 extends from one side of the shell 10 into the radially inner side of the rigid insulating tube 40. The spiral segment 22 is coaxially disposed with the rigid insulating tube 40 and abuts the inner wall of the rigid insulating tube 40. In such an embodiment, the spiral segment 22 can increase the heating density, which is beneficial for maintaining the test specimen 80 at a higher test temperature. The spiral segment 22 is coaxially disposed with the rigid insulating tube 40 and abuts the inner wall of the rigid insulating tube 40, so that the rigid insulating tube 40 and the spiral segment 22 are tightly fitted, thereby improving the abutment effect between the spiral segment 22 and the rigid insulating tube 40. The low heating density of the straight segment 23 helps prevent the axial end of the shell 10, through which the straight segment 23 passes, from becoming too hot, thereby significantly reducing its allowable stress.
[0034] In some embodiments, the rigid insulating tube 40 is sintered from a ceramic material, and before sintering the ceramic material, the heating element 20 is spirally wound on a mold, and the ceramic material is placed radially outside the mold and the heating element 20, so that the rigid insulating tube 40 and the heating element 20 form an integral part, thereby further improving the abutment effect between the spiral section 22 of the heating element 20 and the inner wall of the rigid insulating tube 40, thereby preventing the heating element 20 from collapsing due to heat.
[0035] In addition, the rigid insulating pipe 40 is sintered from ceramic material to utilize the high hardness and thermal stability of the ceramic material to prevent the rigid insulating material from deforming under high temperature and high pressure, ensuring stable radial constraint on the radial outside of the heating element 20. At the same time, by utilizing the insulation of the ceramic material, the heating element 20 can be effectively prevented from leaking electricity, thereby improving the safety of the supercritical CO2 corrosion testing device 1 under high temperature and high pressure.
[0036] In some embodiments, the mold is formed with a spiral groove, and the heater 20 is wound within the spiral groove. The spiral groove fixes the pitch and radius of the heater 20. Furthermore, after the integrated component is fabricated, the portion of the heater 20 that enters the spiral groove is located outside the rigid insulating tube 40. This portion of the heater 20 located outside the rigid insulating tube 40 is the effective heating portion for heating the sample 80. Providing the spiral groove in the mold facilitates controlling the proportion of the heater 20 that is exposed outside the rigid insulating tube 40.
[0037] In some embodiments, the depth of the spiral groove is 1-2 mm less than the diameter of the heating element 20. In this way, after the integral part is prepared, a 1-2 mm threaded groove for fixing the heating element 20 will be formed on the radial inner surface of the rigid insulating tube 40, which is convenient for fixing the heating element 20 and ensures that most of the heating element 20 protrudes from the radial inner surface of the rigid insulating tube 40, thereby ensuring that the heating element 20 dissipates heat into the heating space 21.
[0038] In some embodiments, the supercritical CO2 corrosion testing device 1 further includes: a temperature measuring member 50, which enters the heating space 21 along the axis of the heating space 21 on the same side as the straight segment 23 to measure the temperature within the heating space 21. In the embodiment of the present application, since the temperature measuring member 50 and the straight segment 23 enter the heating space 21 on the same side, the other side of the shell 10 away from the straight segment 23 can be used to remove and place the sample 80, and the temperature measuring member 50 and the straight segment 23 will not interfere with the removal and placement operations; the temperature measuring member 50 enters the heating space 21 along the axis of the heating space 21, which facilitates the temperature measuring member 50 to accurately measure the actual temperature of the sample 80 within the heating space 21.
[0039] In some embodiments, the length of the temperature measuring member 50 within the heating space 21 is one-tenth of the entire length of the heating space 21. This ensures that the space for the sample 80 is not occupied while facilitating accurate measurement of the actual temperature of the space containing the sample 80. Because the temperature measuring member 50 enters the heating space 21 along the axis of the heating space 21, even slight deformation of the temperature measuring member 50 does not affect the test.
[0040] In some embodiments, the temperature measuring member 50 may be a thermocouple.
[0041] In some embodiments, the supercritical CO2 corrosion testing apparatus 1 further includes a cooling element 60 for cooling the shell 10, thereby further reducing the temperature of the shell 10 when heated by the heating element 20 through heat exchange, thereby ensuring that the shell 10 has a high allowable stress. In some embodiments, the cooling element 60 forms a cooling cavity for the flow of a cooling medium, thereby removing heat from the shell 10 via the cooling medium.
[0042] In some embodiments, the supercritical CO 2 corrosion testing device 1 further includes a sample holder 70 for holding a plurality of samples 80 . The sample holder 70 is configured to be pushed radially inward of the heating element 20 .
[0043] In the embodiment of the present application, a sample holder 70 is provided to hold multiple samples 80 in the heating space 21 , so that the supercritical CO 2 corrosion test can be performed on multiple samples 80 at the same time, and the samples 80 can be easily taken in and out.
[0044] In some embodiments, the length of the sample holder 70 is less than the length of the heating element 20, and the sample holder 70 is disposed in the middle of the spiral portion of the heating element 20 to ensure that the temperatures of the multiple samples 80 held by the sample holder 70 are the same, thereby ensuring that the corrosion test conditions of the multiple samples 80 are the same.
[0045] In some embodiments, the thermal insulation member 30 is a thermal insulation pipe, and the rigid insulating pipe 40 is coaxial with and in contact with the thermal insulation pipe, so that the rigid insulating pipe 40 can be fixed by the thermal insulation pipe so that the rigid insulating pipe 40 can be more stably arranged in the shell 10.
[0046] In some embodiments, the thermal insulation 30 is made of ceramic fiber aluminosilicate.
[0047] In some embodiments, the housing 10 includes two covers 11, a tubular body 12, and a plurality of connectors 13. The tubular body 12 has openings formed at both axial ends. The two covers 11 are removably connected to the tubular body 12 at both axial ends to seal the openings and form a receiving cavity 14. The plurality of connectors 13 are used to connect the two covers 11 to the tubular body 12. The heating element 20, the thermal insulation element 30, and the rigid insulating tube 40 are all disposed in the receiving cavity 14.
[0048] In some embodiments, the tubular body 12 includes: two connecting portions 121 and an extension portion 122, the extension portion 122 is arranged between the two connecting portions 121, the two connecting portions 121 have the same diameter and are arranged to be larger than the diameter of the extension portion 122, so as to facilitate the connection of the two cover bodies 11 with the two connecting portions 121.
[0049] In some embodiments, the outer diameter of the two connecting parts 121 is consistent with the diameter of the two cover bodies 11, the two cover bodies 11 form a plurality of connecting through holes, and the two connecting parts 121 form a plurality of connecting grooves corresponding to the connecting through holes. The plurality of connecting parts 13 are inserted into the plurality of connecting through holes and the plurality of connecting grooves in sequence to realize the connection between the two cover bodies 11 and the two connecting parts 121.
[0050] In some embodiments, threads are formed on the surfaces of the multiple connectors 13, and threads are formed on the inner surfaces of the multiple connecting through holes and the multiple connecting grooves. The multiple connectors 13 can be threadedly engaged with the multiple connecting through holes and the multiple connecting grooves to achieve a fastened connection between the two cover bodies 11 and the two connecting portions 121. For example, the multiple connectors 13 can be bolts and nuts.
[0051] In some embodiments, one of the covers 11 forms a first through hole and a second through hole, the size of the first through hole matches the size of the straight section 23 of the heating element 20, and the size of the second through hole matches the size of the temperature measuring element 50. The straight section 23 of the heating element 20 and the temperature measuring element 50 enter the heating space 21 through the first through hole and the second through hole respectively, and at the same time, the straight section 23 of the heating element 20 and the temperature measuring element 50 are fixed at the first through hole and the second through hole respectively.
[0052] In some embodiments, the shell 10 further includes: a plurality of seals 15 , which are disposed between the cover 11 and the connecting portion 121 , thereby sealing the accommodating cavity 14 when the cover 11 and the connecting portion 121 are connected.
[0053] In some embodiments, the seal 15 may be a metal oval pad.
[0054] In some embodiments, the length of the tubular body 12 is greater than the length of the thermal insulation member 30, the inner diameter of the tubular body 12 is set to match the outer diameter of the thermal insulation member 30, and the thermal insulation member 30 is set on the radial inner side of the tubular body 12 and abuts against the inner wall of the tubular body 12.
[0055] In some embodiments, the cooling member 60 is disposed on the outer wall of the extension portion 122 on the radial outside, and is used to cool the extension portion 122 to further reduce the influence of the heating member 20 on the temperature of the extension portion 122 .
[0056] In some embodiments, the length of the extension portion 122 is greater than the length of the spiral section 22 of the heating element 20, and the spiral section 22 is arranged in the middle of the extension portion 122 to reduce the heat transferred from the spiral section 22 to the connecting portion 121, which is beneficial to lowering the temperature of the connecting portion 121 and ensuring the allowable stress of the connecting portion 121.
[0057] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.
[0058] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.
Claims
1. A supercritical CO2 corrosion testing device, characterized in that: include: Shell; a heating element disposed in the housing, the heating element being configured to form a heating space for accommodating a plurality of samples and to heat the heating space to a preset temperature; a heat insulating member disposed between the shell and the heating member and configured to reduce heat transferred from the heating member to the shell; a rigid insulating pipe, disposed between the heating element and the thermal insulation element; The shell is provided with an air inlet interface for supplying high-pressure supercritical CO2 gas into the heating space and an air outlet interface for supplying high-pressure supercritical CO2 gas out of the heating space; The heating element spirally extends on the radial inner side of the rigid insulating tube and abuts against the inner wall of the rigid insulating tube, so that the inner wall of the rigid insulating tube provides radial constraint to the heating element.
2. The testing device according to claim 1, wherein: The length of the heating element is shorter than that of the rigid insulating tube, and the heating element is arranged in the middle of the rigid insulating tube.
3. The testing device according to claim 1, wherein: The heating element includes a spiral segment and a straight segment connected to the spiral segment, the straight segment extends from one side of the shell into the radial inner side of the rigid insulating tube, the spiral segment is coaxially arranged with the rigid insulating tube and abuts against the inner wall of the rigid insulating tube.
4. The testing device according to claim 3, characterized in that: The rigid insulating tube is sintered from a ceramic material, and before sintering the ceramic material, the heater is spirally wound on a mold, and the ceramic material is placed radially outside the mold and the heater, so that the rigid insulating tube and the heater are formed into an integral piece.
5. The testing device according to claim 4, characterized in that: The mold is formed with a spiral groove, and the heating element is wound in the spiral groove.
6. The testing device according to claim 5, characterized in that: The groove depth of the spiral groove is 1-2 mm smaller than the diameter of the heating element.
7. The testing device according to claim 3, characterized in that: Also includes: A temperature measuring member enters the heating space along the axis of the heating space on the same side of the straight section to measure the temperature in the heating space.
8. The testing device according to claim 1, wherein: Also includes: A cooling member is used to cool the shell member.
9. The testing device according to claim 1, wherein: Also includes: The sample holder is used to hold a plurality of samples, and the sample holder is configured to be pushed radially inward of the heating element.
10. The testing device according to any one of claims 1 to 9, characterized in that: The heat insulating member is a heat insulating pipe member, and the rigid insulating pipe member is coaxial with and in contact with the heat insulating pipe member.