Spent fuel reprocessing filtration device and dismounting method

Abstract

The application provides a spent fuel post-treatment filtering device and a dismounting method. The filtering device comprises a cylindrical filter, a filter cup arranged inside the cylindrical filter, and a sealing assembly arranged between the cylindrical filter and the filter cup. The sealing assembly comprises an annular body, a first boss arranged on a first side of the annular body, and a second boss arranged on a second side of the annular body. The diameter of the first boss is smaller than that of the annular body, and a convex surface is formed between the annular body and the first boss. The annular body, the first boss, the second boss, and the convex surface are integrally formed. The diameter of the second boss is smaller than that of the first boss. The sealing assembly of the filtering device has a long service life. When the sealing assembly is damaged, the operator can conveniently dismount the sealing assembly at a long distance by using an auxiliary tool, the frequency of the operator entering a radiation area for work is reduced, and the radiation dose level of the operator is reduced.

Description

Technical Field

[0001] This invention relates to the field of spent fuel reprocessing technology, and in particular to a filtration device and disassembly method for spent fuel reprocessing. Background Technology

[0002] In the spent fuel reprocessing decontamination and plutonium purification facility, the existing sealing components use perfluoropolymer rubber as the main material. This material hardens under high radiation and acidic working conditions, causing it to detach and break off due to friction with the filter cup, resulting in a very short lifespan and unsuitability for engineering applications. Furthermore, it lacks remote replacement capabilities, requiring personnel to perform replacements at close range, increasing the radiation dose to workers. The seal between the cartridge filter and the filter cup is crucial; leakage at the sealing surface is strictly prohibited during operation. Leakage of high-volume feed liquid will significantly increase the dose level in the hot chamber, exposing personnel to unnecessary radiation exposure during equipment maintenance. Simultaneously, feed liquid leakage reduces the visibility through the inspection window, hindering operators' observation of the equipment's operating status and making timely predictions impossible. Summary of the Invention

[0003] This invention provides a fuel aftertreatment filtration device and disassembly method to solve the problems of short service life of the sealing components of the filtration device and inconvenience of remote operation and replacement when the sealing components are damaged.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0005] A filtration device for spent fuel reprocessing, comprising:

[0006] Cartridge filter;

[0007] The filter cup is disposed inside the cartridge filter;

[0008] A sealing assembly is provided between the cartridge filter and the filter cup;

[0009] The sealing assembly includes: an annular body;

[0010] A first protrusion is provided on the first side of the annular body;

[0011] A second protrusion is provided on the second side of the annular body;

[0012] The diameter of the first boss is smaller than the diameter of the annular body, and a convex surface is formed between the annular body and the first boss. The annular body, the first boss, the second boss, and the convex surface are integrally formed.

[0013] The diameter of the second boss is smaller than the diameter of the first boss.

[0014] Optionally, the first boss is in close contact with the cartridge filter.

[0015] Optionally, the second boss is in close contact with the filter cup.

[0016] Optionally, the cartridge filter includes:

[0017] Top cover;

[0018] A cylindrical body is fixedly connected to the top cover, and the filter cup is fixed inside the cylindrical body. The top cover and the filter cup are sealed by a sealing assembly.

[0019] A support that is fixedly connected to the cylinder.

[0020] Optionally, the filter cup includes:

[0021] The cup has a cylindrical structure.

[0022] A support frame is disposed on the outer surface of the cup.

[0023] Optionally, the edge of the second boss is provided with an inclined slope.

[0024] Optionally, the slope of the inclined slope is 5° to 15°.

[0025] Optionally, the surface of the first boss is provided with a guide groove.

[0026] Optionally, the sealing assembly is made of polyethylene.

[0027] The present invention also provides a method for disassembling and assembling a filtration device for spent fuel reprocessing, comprising:

[0028] The auxiliary tooling holds the upper surface of the first protrusion, and the sealing assembly is removed from the cartridge filter by lowering the auxiliary tooling;

[0029] The auxiliary tooling holds the second protrusion in place, and the sealing assembly is fixed to the cartridge filter by the upward movement of the auxiliary tooling.

[0030] The above-described solution of the present invention has at least the following beneficial effects:

[0031] The above-described solution of the present invention utilizes a cylindrical filter; a filter cup disposed inside the cylindrical filter; and a sealing assembly disposed between the cylindrical filter and the filter cup. The sealing assembly includes: an annular body; a first protrusion disposed on a first side of the annular body; and a second protrusion disposed on a second side of the annular body. The diameter of the first protrusion is smaller than the diameter of the annular body, and a convex surface is formed between the annular body and the first protrusion. The annular body, the first protrusion, the second protrusion, and the convex surface are integrally formed. The diameter of the second protrusion is smaller than the diameter of the first protrusion. The sealing assembly of the filter device of the present invention has a long service life. When damaged, operators can easily disassemble and reassemble it remotely using auxiliary tools, reducing the frequency of personnel entering radiation areas and lowering the radiation dose level to personnel. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the filtration device provided in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the cartridge filter provided in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the filter cup provided in an embodiment of the present invention;

[0035] Figure 4 This is a cross-sectional view of a sealing assembly provided in an embodiment of the present invention;

[0036] Figure 5 This is a top view of the sealing assembly provided in an embodiment of the present invention;

[0037] Figure 6 The three-dimensional sealing assembly provided in the embodiments of the present invention Figure 1 ;

[0038] Figure 7 The three-dimensional sealing assembly provided in the embodiments of the present invention Figure 2 .

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Annular body; 2. Sealing assembly; 3. First boss; 4. Second boss; 5. Convex surface; 6. Cartridge filter; 61. Top cover; 62. Cartridge body; 63. Support; 7. Filter cup; 71. Cup body; 72. Support frame. Detailed Implementation

[0041] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0042] like Figures 1 to 7 As shown, an embodiment of the present invention provides a filtration device for spent fuel reprocessing, comprising:

[0043] 6. Cartridge filter;

[0044] The filter cup 7 is disposed inside the cylindrical filter 6;

[0045] The sealing assembly 2 is provided between the cylindrical filter 6 and the filter cup 7;

[0046] The sealing assembly 2 includes: an annular body 1;

[0047] The first protrusion 3 is provided on the first side of the annular body 1;

[0048] The second protrusion 4 is provided on the second side of the annular body 1;

[0049] The diameter of the first protrusion 3 is smaller than the diameter of the annular body 1, and a convex surface 5 is formed between the annular body 1 and the first protrusion 3. The annular body 1, the first protrusion 3, the second protrusion 4, and the convex surface 5 are integrally formed.

[0050] The diameter of the second boss 4 is smaller than the diameter of the first boss 3.

[0051] In this embodiment, the filtration device for spent fuel reprocessing includes a cartridge filter 6 and a filter cup 7. During operation, the cartridge filter 6 and the filter cup 7 are assembled and used, and the sealing component 2 is used as a sealing structure between the contact surfaces of the cartridge filter and the filter cup.

[0052] like Figures 3 to 7As shown, the sealing assembly 2 includes an annular body 1, with a first protrusion 3 and a second protrusion 4 respectively disposed on both sides of the annular body 1. A convex surface 5 is formed between the annular body 1 and the first protrusion 3. The annular body 1, the first protrusion 3, the second protrusion 4, and the convex surface 5 are integrally formed. The diameter of the second protrusion 4 is smaller than the diameter of the first protrusion 3, and the diameter of the annular body 1 is larger than the diameters of the first protrusion 3 and the second protrusion 4. The end face of the first protrusion 3 is tightly fitted with the cylindrical filter 6, achieving end face sealing through mechanical extrusion. The end face of the second protrusion 4 is tightly fitted with the filter cup 7, achieving end face sealing through mechanical extrusion. The convex surface 5 is in close contact with the inner wall of the filter cup 7, forming a vertical surface seal. The dual sealing of end face and vertical surface ensures airtightness.

[0053] Both sides of the sealing component 2 are designed with boss structures, which facilitates remote operation during disassembly and installation. When damaged, it can be quickly disassembled using an electric follow-up robot with special replacement tooling without requiring close contact with personnel, thus avoiding unnecessary exposure to radiation doses.

[0054] The sealing component 2 in this embodiment has a long service life. When damaged, it can be easily disassembled and reassembled remotely by operators using auxiliary tools, which reduces the frequency of personnel entering the radiation area and lowers the radiation dose level of personnel.

[0055] like Figure 2 As shown, in an optional embodiment of the present invention, the cartridge filter 6 includes:

[0056] Top cover 61;

[0057] The upper cover 61 is fixedly connected to the cylinder 62, the filter cup 7 is fixed inside the cylinder 62, and the upper cover 61 and the filter cup 7 are sealed by the sealing assembly 2;

[0058] Support 63 is fixedly connected to the cylinder 62.

[0059] In this embodiment, the cylinder 62 is the main structure of the cartridge filter 6, typically made of carbon steel, low-alloy steel, or stainless steel, and is used to house other components and provide filtration space. The top cover 61 seals the top of the cylinder 62, usually connected by a flange, facilitating disassembly and replacement of the filter element while ensuring the filter's airtightness. The support 63 supports and secures the filter, facilitating installation and maintenance.

[0060] like Figure 3 As shown, in an optional embodiment of the present invention, the filter cup 7 includes:

[0061] 71. A cylindrical cup body;

[0062] Support frame 72 is provided on the outer surface of the cup body 71.

[0063] In this embodiment, the cup body 71 is the main structure of the filter cup 7. The outer surface of the cylindrical cup body 71 is provided with a support frame 72 to provide mechanical strength and prevent the cup body 71 from deforming or breaking under pressure.

[0064] In an optional embodiment of the present invention, the edge of the second boss 4 is provided with an inclined slope.

[0065] In an optional embodiment of the invention, the slope of the inclined slope is 5° to 15°.

[0066] In the above embodiment, the contact surface between the second boss 4 and the filter cup 7 is provided with a slightly sloped vertical surface, the slope of which can be set to 5° to 15°, forming an interference fit with the inner wall of the filter cup 7, so as to achieve vertical surface sealing by tightly fitting with the inner wall of the filter cup 7.

[0067] In an optional embodiment of the present invention, the surface of the first boss 3 is provided with a guide groove.

[0068] In this embodiment, the surface of the first boss 3 is provided with a guide groove, which cooperates with the contact surface of the cylindrical filter 6 for precise positioning during the lifting and lowering process of the filter cup 7.

[0069] In an optional embodiment of the present invention, the sealing assembly is made of polyethylene.

[0070] In this embodiment, the sealing component is made of polyethylene. The rigidity and plasticity of polyethylene allow it to simultaneously achieve end-face sealing (mechanical extrusion) and vertical sealing (sloping surface bonding). Polyethylene exhibits strong molecular structural stability under high radiation environments, making it resistant to hardening or embrittlement. Polyethylene also possesses excellent chemical inertness to strong acids (such as nitric acid in spent fuel reprocessing), preventing swelling or corrosion and avoiding localized degradation that could lead to seal failure. Furthermore, polyethylene exhibits minimal deformation under long-term mechanical extrusion, maintaining the stability of the sealing interface. Its high surface hardness results in less frictional debris when in contact with filter cups, reducing the risk of leakage due to wear.

[0071] The present invention also provides a method for disassembling and assembling a filtration device for spent fuel reprocessing, comprising:

[0072] Step 1: The auxiliary tooling clamps the upper surface of the first protrusion 3, and the sealing assembly 2 is removed from the cylindrical filter 6 by lowering the auxiliary tooling.

[0073] Step 2: The auxiliary tooling clamps the second protrusion 4, and the sealing assembly 2 is installed and fixed to the cylindrical filter 6 by the upward movement of the auxiliary tooling.

[0074] In this embodiment, the sealing component 2 of the filter device is replaced using an auxiliary tool and an electrically driven robotic arm. If the sealing component 2 is damaged, it can be removed by using the auxiliary tool to hold the upper surface of the first protrusion 3 and lowering it.

[0075] During installation, place the second protrusion 4 of the sealing component 2 into the corresponding position of the auxiliary tooling, and use the auxiliary tooling to raise the sealing component 2 to the sealing position to install the sealing component 2 in place.

[0076] When the sealing assembly 2 performs its sealing function, both its end face and vertical surface are sealed simultaneously. The polyethylene material ensures the sealing effect while extending the service life of the sealing assembly 2. During the process of the filter cup 7 rising to the sealing position via the lifting platform, it is guided by the boss. After reaching the position, the inner wall of the cup mouth cooperates with the second boss 4 of the sealing assembly 2 to complete the vertical surface seal. The upper end face of the filter cup 7 contacts the lower end face of the convex surface 5 of the sealing assembly 2 to complete the end face seal.

[0077] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A filtration device for spent fuel reprocessing, characterized in that, include: Cartridge filter (6); The cartridge filter (6) includes: a top cover (61); a cylinder (62) fixedly connected to the top cover (61), a filter cup (7) is provided inside the cylinder (62), and the top cover (61) and the filter cup (7) are sealed by a sealing assembly (2); a support (63) fixedly connected to the cylinder (62); the sealing assembly (2) is made of polyethylene. The sealing assembly (2) includes: an annular body (1); The first boss (3) is provided on the first side of the annular body (1); The second boss (4) is provided on the second side of the annular body (1); The diameter of the first boss (3) is smaller than the diameter of the annular body (1), and a convex surface (5) is formed between the annular body (1) and the first boss (3). The annular body (1), the first boss (3), the second boss (4), and the convex surface (5) are integrally formed. The diameter of the second boss (4) is smaller than the diameter of the first boss (3).

2. The filtration device for spent fuel reprocessing according to claim 1, characterized in that, The first boss (3) is in close contact with the cartridge filter (6).

3. The filtration device for spent fuel reprocessing according to claim 1, characterized in that, The second protrusion (4) is in close contact with the filter cup (7).

4. The filtration device for spent fuel reprocessing according to claim 1, characterized in that, The filter cup (7) includes: A cylindrical cup body (71); A support frame (72) is provided on the outer surface of the cup body (71).

5. The filtration device for spent fuel reprocessing according to claim 1, characterized in that, An inclined slope is provided at the edge of the second boss (4).

6. The filtration device for spent fuel reprocessing according to claim 5, characterized in that, The slope of the inclined slope is 5° to 15°.

7. The filtration device for spent fuel reprocessing according to claim 1, characterized in that, The surface of the first boss (3) is provided with a guide groove.

8. A method for disassembling and assembling a filtration device for spent fuel reprocessing as described in any one of claims 1 to 7, characterized in that, include: The auxiliary tooling clamps the upper end face of the first boss (3), and the sealing assembly is removed from the cartridge filter (6) by lowering the auxiliary tooling; The auxiliary tooling holds the second protrusion (4) in place, and the sealing assembly is installed and fixed to the cartridge filter (6) by the upward movement of the auxiliary tooling.

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