Cover body assembly and supercritical water oxidation reactor
By employing a multi-layered sealing structure and an adaptive compression mechanism, the sealing failure problem of the supercritical water oxidation reactor cover interface under high temperature, high pressure, and frequent thermal cycling was solved, achieving stable sealing under complex operating conditions, reducing leakage risk, and improving sealing reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-04-14
AI Technical Summary
The sealing interface of the cover of a supercritical water oxidation reactor is easily damaged under high temperature, high pressure and frequent thermal cycling, leading to seal failure and a high risk of media leakage.
The system employs a multi-seal structure, including axial sealing contact between the first and second sealing surfaces, circumferential sealing of the annular welded part, and axial clamping force provided by the fastening structure. Combined with the adaptive clamping mechanism of the annular seal, it forms a multi-seal defense line to counteract operating condition fluctuations and vibrations.
Maintain stable sealing performance under harsh operating conditions, reduce leakage risk, improve the adaptability and reliability of the sealing structure, and extend service life.
Smart Images
Figure CN121854599A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of sealing technology, and in particular to a cover assembly and a supercritical water oxidation reactor. Background Technology
[0002] Supercritical water oxidation technology is an advanced oxidation technology that can efficiently treat organic waste, especially radioactive waste. Supercritical water oxidation reactors operate under extreme conditions of high temperature and high pressure for a long time. During startup, operation, and shutdown, supercritical water oxidation reactors undergo frequent thermal cycles, which may damage the sealing interface of the reactor's cover. The medium inside the supercritical water oxidation reactor contains highly oxidizing fluids and inorganic salt particles that may precipitate. Medium deposition or embedding in the sealing interface can scratch or raise the sealing surface, compromising the integrity of the seal. Summary of the Invention
[0003] This application provides a cover assembly and a supercritical water oxidation reactor. Under the axial clamping force of the fastening structure, the first sealing surface and the second sealing surface are sealed and abutted together. The annular welded part surrounds the outer periphery of the first lip and the second lip. The combination of multiple seals and the fastening structure ensures that the sealing performance is basically not reduced.
[0004] The technical solution of this application embodiment is implemented as follows: This application provides a cover assembly and a supercritical water oxidation reactor, the cover assembly comprising: The main body includes a mounting port and a first lip, the first lip surrounding the outer periphery of the mounting port, and the first lip having a first sealing surface; A cover is disposed at one end of the main body along the axial direction. The cover includes a second lip and closes the mounting port. The second lip has a second sealing surface. The first sealing surface and the second sealing surface are opposite each other along the axial direction and seal against each other. The outer peripheries of the second lip and the first lip are welded to form an annular welded portion. A fastening structure connects the main body and the cover.
[0005] In some embodiments, the cover assembly includes: An annular seal, wherein at least one of the first sealing surface and the second sealing surface forms an annular groove, the annular seal is disposed within the annular groove, and the annular groove is located between the mounting port and the annular weld portion.
[0006] In some embodiments, the annular groove includes a first groove wall and a second groove wall that are radially opposed, and the annular seal includes a first surface and a second surface; The annular seal undergoes radial compression deformation, causing the first surface to seal against the first groove wall and the second surface to seal against the second groove wall.
[0007] In some embodiments, both the first sealing surface and the second sealing surface form the annular groove, the annular grooves of the first sealing surface and the annular grooves of the second sealing surface are axially opposite each other, and a portion of the structure of the annular seal is located within the two axially opposite annular grooves.
[0008] In some embodiments, the medium pressure from the mounting port acts on the cover, thereby pressing the annular seal.
[0009] In some embodiments, the fastening structure includes: Nut; Bolts are inserted through the main body and the cover. Nuts are respectively provided at both ends of the bolts on the main body and the cover. The nuts are threadedly engaged with the bolts to apply a preload to the main body and the cover.
[0010] In some embodiments, the fastening structure includes gaskets, with at least one gasket disposed between each of the nuts and the body, and at least one gasket disposed between each of the nuts and the cover.
[0011] In some embodiments, there are multiple fastening structures, which are spaced apart circumferentially.
[0012] In some embodiments, at least one of the body and the cover is made of a nickel-based alloy material.
[0013] In some embodiments, the supercritical water oxidation reactor includes: In any of the above-described cover assembly, the main body forms a reaction chamber, and the reaction chamber is connected to the mounting port.
[0014] The cover assembly provided in this application embodiment, under the axial clamping force of the fastening structure, achieves a first sealing seal by sealing the first sealing surface and the second sealing surface together; the annular welded portion surrounds the outer periphery of the first and second lips, achieving a second sealing seal. Thus, the cover seals the installation opening through a multi-seal structure. The fastening structure and the multi-seal structure work together. The continuous axial clamping force provided by the fastening structure can, to a certain extent, offset the reverse forces generated by axial pressure fluctuations and vibrations during operation, ensuring that the first and second sealing surfaces always maintain a stable contact state. At the same time, the rigid connection of the annular welded portion further enhances the overall stability, allowing it to withstand the tests of complex operating conditions such as high temperature, high pressure, and frequent temperature cycling. The cooperation between the multi-seal and the fastening structure ensures that the sealing performance does not decrease significantly, improving adaptability to harsh operating conditions and reducing leakage accidents caused by seal failure. Attached Figure Description
[0015] Figure 1 These are schematic diagrams of the cover assembly provided in some embodiments of this application; Figure 2 These are schematic diagrams of the structure of the cover provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of the main body provided in some embodiments of this application.
[0016] Explanation of reference numerals in the attached figures Main body 1; mounting port 100; reaction chamber 101; first lip 11; first sealing surface 11a; cover 2; second lip 21; second sealing surface 21a; annular groove 10; annular welded part 20; fastening structure 3; nut 31; bolt 32; gasket 33; annular seal 4. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of this application clearer, embodiments of the technical solutions of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of this application, and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.
[0019] In the description of the embodiments of this application, the technical terms "first", "second", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.
[0020] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that combinations can be made in any suitable manner without contradiction; for example, different combinations of specific technical features / embodiments can form different implementations. To avoid unnecessary repetition, the various possible combinations of specific technical features / embodiments in this application will not be described separately.
[0021] It should be noted that in this application, "multiple" includes two or more.
[0022] Please see Figures 1 to 3 This application provides a cover assembly, which includes a main body 1, a cover 2, and a fastening structure 3. The main body 1 includes an installation port 100 and a first lip 11. The first lip 11 surrounds the outer periphery of the installation port 100 and has a first sealing surface 11a. The cover 2 is disposed at one end of the main body 1 along the axial direction. The cover 2 includes a second lip 21 and closes the installation port 100. The second lip 21 has a second sealing surface 21a. The first sealing surface 11a and the second sealing surface 21a are opposite to each other along the axial direction and seal against each other. The outer peripheries of the second lip 21 and the first lip 11 are welded to form an annular weld portion 20. The fastening structure 3 connects the main body 1 and the cover 2.
[0023] The shape of the mounting port 100 is not limited. For example, the shape of the mounting port 100 includes, but is not limited to, a circle, an ellipse, or a polygon.
[0024] It should be noted that the axial direction here can be the axis direction of the mounting port 100, the circumferential direction is the circumferential direction around the axial direction, and the radial direction can be the radius or diameter perpendicular to the axial direction.
[0025] The sealing contact between the first sealing surface 11a and the second sealing surface 21a means that the first sealing surface 11a and the second sealing surface 21a are tightly abutted in the axial direction.
[0026] The fastening structure 3 connects the main body 1 and the cover 2. The fastening structure 3 can provide a continuous axial clamping force so that the first sealing surface 11a and the second sealing surface 21a always maintain a sealed contact.
[0027] The annular welded portion 20 is a closed-loop solid structure surrounding the first lip 11 and the second lip 21. The annular welded portion 20 can be formed by welding. That is, it can be welded around the first lip 11 and the second lip 21 in one or more complete circles to form the annular welded portion 20. The annular welded portion 20 forms a fully enclosed sealing and protective structure, located outside the first sealing surface 11a and the second sealing surface 21a.
[0028] The cover assembly provided in this embodiment, under the axial clamping force of the fastening structure 3, achieves a first sealing seal by sealing the first sealing surface 11a and the second sealing surface 21a; the annular welded portion 20 surrounds the outer periphery of the first lip 11 and the second lip 21, achieving a second sealing seal. Thus, the cover 2 seals the installation opening 100 through a multi-seal structure. The fastening structure 3 and the multi-seal structure work together. The continuous axial clamping force provided by the fastening structure 3 can, to a certain extent, offset the reverse force generated by axial pressure fluctuations and vibrations during operation, ensuring that the first sealing surface 11a and the second sealing surface 21a always maintain a stable contact state. At the same time, the rigid connection of the annular welded portion 20 further enhances the overall stability, allowing it to withstand the tests of complex operating conditions such as high temperature, high pressure, and frequent temperature cycles. The cooperation between the multi-seal structure and the fastening structure 3 ensures that the sealing performance does not degrade, improves the adaptability to harsh operating conditions, and reduces leakage accidents caused by seal failure.
[0029] The cover assembly provided in this application embodiment can be used in a supercritical water oxidation reactor. The supercritical water oxidation reactor provided in this application embodiment includes the cover assembly in any one embodiment of this application. The main body 1 forms a reaction chamber 101, and the reaction chamber 101 is connected to the mounting port 100.
[0030] The medium inside the reaction chamber 101 includes liquid water, oxidant, and radioactive organic waste. By controlling the temperature and pressure, the liquid water inside the reaction chamber 101 reaches a supercritical state. The radioactive organic waste undergoes an oxidation-reduction reaction with the oxidant, thereby decomposing the radioactive organic waste into inorganic substances such as carbon dioxide, liquid water, and inorganic salts. Due to the high temperature and high pressure environment of the reaction system and the product phase separation process, the radionuclides are enriched in the solid residue or aqueous solution, thus achieving separation from the organic waste.
[0031] The type of oxidant is not limited; for example, the oxidant may include oxygen or air, etc.
[0032] The core of supercritical water oxidation (SCWO) is to utilize the physicochemical properties of supercritical water to cause radioactive organic waste to undergo an oxidation reaction with an oxidant in a reactor, decomposing the organic components into harmless small molecule compounds such as CO2 and H2O, while simultaneously solidifying or enriching radionuclides.
[0033] Water has a critical temperature of 374℃ and a critical pressure of 22.1 MPa. When both temperature and pressure exceed these critical values, water enters a supercritical state. At this point, the gas-liquid interface of water disappears, forming a homogeneous system that combines properties of both gas and liquid. This system is characterized by low density, low dielectric constant, high diffusion coefficient, and strong solubility. It is completely miscible with nonpolar organic matter (such as the oil phase component in radioactive organic waste) and gases (such as oxidants O2 and air), providing a favorable environment for homogeneous oxidation reactions.
[0034] Radioactive organic waste mainly originates from the operation of nuclear facilities and the nuclear fuel cycle.
[0035] During the operation of the supercritical water oxidation reactor, the temperature in the reaction chamber 101 is usually around 400℃ to 600℃, and the pressure is around 23MPa to 35MPa, maintaining the water in the reaction chamber 101 in a supercritical state.
[0036] The shape of the reaction chamber 101 is not limited. For example, the reaction chamber 101 can be generally cylindrical or prismatic, etc.
[0037] In some embodiments, the cover 2 can be disposed on the upper or lower side of the main body 1, and its axial direction can be parallel to the vertical direction.
[0038] In some embodiments, the cover 2 may also be disposed on one side of the main body 1 in the horizontal direction, and the axial direction may be parallel to the horizontal direction.
[0039] It should be noted that in the embodiments of this application, "up" refers to the direction towards the sky, and "down" is the opposite of "up," referring to the direction towards the ground. The horizontal direction is perpendicular to the vertical direction.
[0040] In some embodiments, a plane perpendicular to the axial direction is used as the projection plane, and the projection of the first sealing surface 11a overlaps with the projection of the second sealing surface 21a.
[0041] As an example, the central axis of the first sealing surface 11a extending in the vertical direction coincides with the central axis of the second sealing surface 21a extending in the vertical direction.
[0042] In some embodiments, please refer to Figure 2 The cover 2 includes a base material and a second lip 21, which protrudes from the base material in the axial direction. This facilitates welding of the first lip 11 and the second lip 21.
[0043] In some embodiments, the main body 1 includes a cylindrical part and a flange part. The flange part can be disposed at the axial end of the cylindrical part. The fastening structure 3 connects the flange part and the cover 2. The cylindrical part forms a reaction chamber 101. The flange part can form an installation port 100. In the axial direction, the first lip 11 can protrude from the flange part.
[0044] In some embodiments, the outer periphery of the first lip 11 and the outer periphery of the second lip 21 can form an annular bevel. Solder fills the annular bevel and forms an annular weld portion 20. The annular weld portion 20 generates radial contraction force when cooling, continuously pressing the body 1 and the cover 2, improving sealing reliability. In some cases, the lip-shaped sealing design of the first lip 11 and the second lip 21 can be repaired on-site without disassembling the body 1 and the cover 2, making it easy to implement and maintain.
[0045] In some embodiments, please refer to Figures 1 to 3 The cover assembly includes an annular seal 4. At least one of the first sealing surface 11a and the second sealing surface 21a forms an annular groove 10. The annular seal 4 is disposed within the annular groove 10, which is located between the mounting opening 100 and the annular weld portion 20. Specifically, the annular groove 10 has a closed annular structure that closes circumferentially. The annular seal 4 is a closed annular structure that closes circumferentially and can surround the entire circumference of the mounting opening 100.
[0046] In this embodiment, the annular seal 4 can achieve a third seal, constructing a multi-layered sealing defense that can withstand high temperature and high pressure environments, thereby further enhancing the sealing effect and doubling the sealing reliability.
[0047] In some embodiments, the first sealing surface 11a forms an annular groove 10, and the annular seal 4 is disposed in the annular groove 10 of the first sealing surface 11a.
[0048] In some embodiments, the second sealing surface 21a forms an annular groove 10, and the annular seal 4 is disposed in the annular groove 10 of the second sealing surface 21a.
[0049] In some embodiments, both the first sealing surface 11a and the second sealing surface 21a form an annular groove 10, and the annular seal 4 is disposed in the annular groove 10 of the first sealing surface 11a and the second sealing surface 21a.
[0050] The number of annular seals 4 is unlimited; for example, there may be one or more annular seals 4. As an example, multiple annular seals 4 are distributed at radial intervals.
[0051] The material of the annular seal 4 is not limited; for example, the annular seal 4 can be made of elastic metal, etc.
[0052] The size of the annular seal 4 is not limited, and the size of the annular seal 4 can fit tightly with the annular groove 10.
[0053] In some embodiments, the annular groove 10 includes a first groove wall and a second groove wall that are radially opposed, and the annular seal 4 includes a first surface and a second surface; the annular seal 4 undergoes radial compression deformation such that the first surface seals against the first groove wall and the second surface seals against the second groove wall.
[0054] In this embodiment, the increased medium pressure inside the reaction chamber 101 acts on the cover 2, increasing the axial force generated by the fastening structure 3. This leads to greater radial compression deformation of the annular seal 4, thereby increasing the contact area between the first surface and the first groove wall, and between the second surface and the second groove wall. This creates an adaptive tightening force, effectively reducing internal leakage. The self-tightening force is evenly distributed across the entire contact surface, improving stability and service life. The annular seal 4 generates an adaptive tightening effect based on the medium pressure, eliminating the need for continuous external tightening force. Instead, the stronger the force generated by the medium, the stronger the self-tightening effect. Thus, the annular seal 4 possesses pressure self-tightening capability; as the medium pressure increases, the seal becomes tighter, preventing inorganic salt particles that may be present in the medium from depositing or embedding at the sealing interface, scratching or raising the sealing interface. In some embodiments, the supercritical water oxidation reactor undergoes frequent thermal cycles during startup, operation, and shutdown, causing the cover 2 to expand and contract. In this application, the medium pressure can cause the first and second surfaces of the annular seal 4 to undergo radial elastic deformation, further improving the sealing reliability and achieving a self-tightening effect where the higher the medium pressure, the tighter the seal.
[0055] In some embodiments, please refer to Figures 1 to 3 Both the first sealing surface 11a and the second sealing surface 21a form annular grooves 10. The annular grooves 10 of the first sealing surface 11a and the second sealing surface 21a are axially opposite to each other, and part of the structure of the annular seal 4 is located within the two axially opposite annular grooves 10. In this way, the annular seal 4 makes sealing contact with the groove walls of the two annular grooves 10, which not only improves the positional stability of the annular seal 4 and reduces the risk of displacement of the annular seal 4, but also improves the sealing effect.
[0056] In some embodiments, please refer to Figure 1 The medium pressure from the installation port 100 acts on the cover 2, thereby pressing the annular seal 4.
[0057] For example, when the pressure of the medium inside the reactor increases, the medium pressure acts on the cover 2, causing the fastening structure 3 to generate a greater axial force. The cover 2 adaptively presses the annular seal 4, which has a pressure self-tightening capability, and the sealing performance is enhanced as the pressure increases.
[0058] In some embodiments, the two end faces of the annular seal 4 in the axial direction are planar.
[0059] In some embodiments, one end face of the annular seal 4 in the axial direction is a convex arc surface. The annular seal 4 can be approximately a convex lens seal.
[0060] In some embodiments, please refer to Figure 1 The fastening structure 3 includes a nut 31 and a bolt 32. The bolt 32 passes through the main body 1 and the cover 2. Nuts 31 are respectively provided at both ends of the bolt 32. The nuts 31 and bolts 32 are threadedly engaged to apply a preload to the main body 1 and the cover 2.
[0061] Pre-tightening force refers to the tightening force applied to the connection or sealing structure before the working load is applied, which can make the cover 2 and the main body 1 produce an initial compressed state, providing the basic conditions for subsequent sealing.
[0062] For example, when tightening the bolt 32, the applied torque is converted into a preload force on the bolt 32, causing the bolt 32 to be under tension and the nut 31 to be under pressure. A positive pressure is generated between the sides of the thread teeth. When the medium pressure in the mounting port 100 increases, the static friction between the threads can prevent the nut 31 from rotating relative to each other, thus preventing loosening.
[0063] In some embodiments, the cover 2 forms a plurality of first through holes distributed circumferentially, and the main body 1, such as the flange portion, forms a plurality of second through holes distributed circumferentially. Each first through hole corresponds to one second through hole. Each bolt 32 passes through one first through hole and one second through hole. Two nuts 31 are located at opposite ends of the main body 1 and the cover 2 in the axial direction, and are threadedly engaged with the bolts 32. The second through holes are located on the outer periphery of the mounting opening 100.
[0064] As an example, the first through holes can be evenly distributed circumferentially. The second through holes can also be evenly distributed circumferentially. Multiple bolts 32 and multiple nuts 31 are threaded together to tightly connect the body 1 and the cover 2.
[0065] The type of nut 31 is not limited; for example, nut 31 can be an octagonal nut.
[0066] The shape of bolt 32 is not limited. For example, bolt 32 can be a double-ended bolt with threads at both ends.
[0067] The type of bolt 32 is not limited; for example, bolt 32 can be an M56 bolt, etc.
[0068] In some embodiments, the fastening structure 3 includes a gasket 33, at least one gasket 33 is provided between each nut 31 and the main body 1, and at least one gasket 33 is provided between each nut 31 and the cover 2.
[0069] Gasket 33 is a sealing element that fills the microscopic gap between two mating parts and can be elastically / plastically deformed by preload / medium pressure.
[0070] For example, a gasket 33 is fitted onto a bolt 32. One end of the gasket 33 contacts the main body 1 or the cover 2, and the other end contacts the nut 31. When the bolt 32 is tightened, the applied torque is converted into a preload force on the bolt 32. This preload force causes the gasket 33 to undergo elastoplastic deformation, forming a forced preload seal. The combination of the bolt 32 and the gasket 33 enhances the sealing performance as the pressure increases, improving the sealing reliability of the supercritical water oxidation reactor. Simultaneously, the connection between the main body 1 and the cover 2 via the bolt 32, nut 31, and gasket 33 facilitates disassembly, maintenance, and replacement.
[0071] Elastic-plastic deformation refers to the process in which an object undergoes both elastic and plastic deformation simultaneously under the action of an external force. When an external force is applied, the object will immediately deform completely; after the external force is removed, only the elastic deformation will disappear immediately, while the plastic deformation will be permanently retained and cannot recover on its own.
[0072] The shape of the gasket 33 is not limited; for example, the gasket 33 may be generally in the shape of an annular sheet, etc.
[0073] The material of the gasket 33 is not limited; for example, the gasket 33 may be made of stainless steel or the like.
[0074] The number of gaskets 33 can be multiple, for example, the number of gaskets 33 is two or more.
[0075] In some embodiments, there are multiple fastening structures 3, which are spaced apart circumferentially. Multiple fastening structures 3 can enhance the stability of the connection.
[0076] For example, 16 M56 bolts 32 and washers 33 are evenly distributed circumferentially to tightly connect the main body 1 and the cover 2, and are evenly distributed and tightened in a prescribed pre-tightening sequence.
[0077] In some embodiments, at least one of the body 1 and the cover 2 is made of a nickel-based alloy material.
[0078] The main body 1 can be made of nickel-based alloy material; the cover 2 can be made of nickel-based alloy material; or both the main body 1 and the cover 2 can be made of nickel-based alloy material.
[0079] In this embodiment, at least one of the main body 1 and the cover 2 is made of nickel-based alloy material, which can withstand high temperature and high pressure, is not easily oxidized and corroded by strong oxidizing media, avoids material penetration, and improves sealing reliability.
[0080] There are no restrictions on the type of nickel-based alloy material; for example, nickel-based alloy materials can be NS3306 material, etc.
[0081] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application 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 or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way.
Claims
1. A cover assembly, characterized in that, The cover assembly includes: The main body includes a mounting port and a first lip, the first lip surrounding the outer periphery of the mounting port, and the first lip having a first sealing surface; A cover is disposed at one end of the main body along the axial direction. The cover includes a second lip and closes the mounting port. The second lip has a second sealing surface. The first sealing surface and the second sealing surface are opposite each other along the axial direction and seal against each other. The outer peripheries of the second lip and the first lip are welded to form an annular welded portion. A fastening structure connects the main body and the cover.
2. The cover assembly according to claim 1, characterized in that, The cover assembly includes: An annular seal, wherein at least one of the first sealing surface and the second sealing surface forms an annular groove, the annular seal is disposed within the annular groove, and the annular groove is located between the mounting port and the annular weld portion.
3. The cover assembly according to claim 2, characterized in that, The annular groove includes a first groove wall and a second groove wall that are radially opposite each other, and the annular seal includes a first surface and a second surface; The annular seal undergoes radial compression deformation, causing the first surface to seal against the first groove wall and the second surface to seal against the second groove wall.
4. The cover assembly according to claim 2, characterized in that, Both the first sealing surface and the second sealing surface form the annular groove. The annular grooves of the first sealing surface and the second sealing surface are axially opposite each other. A portion of the structure of the annular seal is located within the two axially opposite annular grooves.
5. The cover assembly according to claim 2, characterized in that, The medium pressure from the mounting port acts on the cover, thereby pressing the annular seal.
6. The cover assembly according to claim 1, characterized in that, The fastening structure includes: Nut; Bolts are inserted through the main body and the cover. Nuts are respectively provided at both ends of the bolts on the main body and the cover. The nuts are threadedly engaged with the bolts to apply a preload to the main body and the cover.
7. The cover assembly according to claim 6, characterized in that, The fastening structure includes gaskets, with at least one gasket disposed between each nut and the main body, and at least one gasket disposed between each nut and the cover.
8. The cover assembly according to claim 1, characterized in that, The number of fastening structures is multiple, and the multiple fastening structures are arranged at intervals along the circumference.
9. The cover assembly according to any one of claims 1 to 8, characterized in that, At least one of the main body and the cover is made of a nickel-based alloy material.
10. A supercritical water oxidation reactor, characterized in that, The supercritical water oxidation reactor includes: The cover assembly according to any one of claims 1 to 9, wherein the body forms a reaction chamber, and the reaction chamber is in communication with the mounting port.