A heat conducting block for sodium valve and electric heating block of sodium-cooled fast reactor

Abstract

The utility model relates to the technical field of fast reactor sodium valve debugging operation, aims at solving the problem of the temperature rise in the process of sodium valve debugging and operation of sodium-cooled fast reactor engineering, discloses a kind of heat conducting block for sodium-cooled fast reactor sodium valve and electric heating block, front surface is equipped with curved surface groove, back is rectangular plane, central part is equipped with center hole, the radius of curved surface groove is 100mm~103mm, the length of heat conducting block is 99.8mm~100.2mm, width is 149.8mm~150.2mm.The utility model greatly improves the safety of sodium-cooled fast reactor unit, can reduce emission, reduce cost and increase efficiency, and the operating temperature of electric heating block will be greatly reduced, and the valve after increasing heat conducting block reduces the heat loss of electric heating under the condition that the heat preservation form is unchanged.

Description

Technical Field

[0001] This utility model relates to the field of commissioning and operation technology of sodium valves in fast reactors, and in particular to a heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors. Background Technology

[0002] Sodium valves, unique to sodium-cooled fast reactors, have stricter temperature requirements compared to valves in pressurized water reactors. They must prevent sodium from solidifying during opening / closing processes or when used as isolation boundaries. Therefore, electric heating blocks are installed on the valve body to maintain its temperature. During the heating process of sodium valves in the demonstration fast reactor, it was found that some valves failed to reach the target temperature. The design documents specify that the valve body temperature must reach 250°C and the valve stem temperature must reach at least 180°C before the valve can be operated; otherwise, operating the valve with sodium present could cause damage.

[0003] During the disassembly and assembly of the valve electric heating block, it was found that the gap between the heating block and the valve body was too large. Measurement showed that the maximum gap between the valve body and the electric heating block was 8.52mm, which greatly reduced the heat transfer efficiency. As a result, the temperature of the electric heating block could not be effectively transferred to the valve seat. In actual application, the temperature of the heating block was much higher than that of the valve body.

[0004] For valves requiring a temperature above 200℃, the main control temperature display is significantly higher than the valve body's design temperature, posing a potential risk that the valve body temperature may not meet the requirements. Under emergency conditions, high-temperature sodium flowing through the valve could cause thermal shock, potentially damaging the valve and seriously threatening unit safety. Utility Model Content

[0005] The purpose of this invention is to provide a heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors, solving the problem of temperature rise during the commissioning and operation of sodium valves in sodium-cooled fast reactor projects.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors, wherein the heat-conducting block has a curved groove on its front side and a rectangular plane on its back side, and a central hole in the middle of the heat-conducting block; the radius of the curved groove is 100mm to 103mm, the length of the heat-conducting block is 99.8mm to 100.2mm, and the width is 149.8mm to 150.2mm.

[0008] In some embodiments, the central hole is a rectangular hole.

[0009] In some embodiments, the central hole is arranged at the exact center of the heat-conducting block, and its length direction is the same as that of the heat-conducting block.

[0010] In some embodiments, the length of the central hole is 73.5 mm to 73.6 mm and the width is 53.5 mm to 53.6 mm.

[0011] In some embodiments, the maximum thickness of the heat-conducting block is 24.5 mm.

[0012] In some embodiments, the maximum thickness of the heat-conducting block is located at the four corners.

[0013] In some embodiments, the heat-conducting block has a structure that is symmetrical both vertically and horizontally.

[0014] In some embodiments, the heat-conducting block is an aluminum heat-conducting block.

[0015] In some embodiments, the heat-conducting block is a copper heat-conducting block.

[0016] In some embodiments, the radius of the curved groove is 100mm to 103mm.

[0017] Compared with the prior art, the heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors provided by this utility model has the following beneficial effects:

[0018] This invention achieves the technical effect of ensuring that the sodium valve of a sodium-cooled fast reactor reaches the target temperature stably and accurately by installing a heat-conducting block between the sodium valve and the electric heating block.

[0019] This invention significantly improves the safety of sodium-cooled fast reactor units. It also saves energy, reduces emissions, lowers costs, and increases efficiency. The operating temperature of the electric heating block will be significantly reduced; by adding a heat-conducting block to the valve while maintaining the same insulation method, heat loss from electric heating is greatly reduced.

[0020] This invention improves the stability of valve and electric heater operation. For sodium valves, frequent temperature changes can cause material fatigue and localized overheating; similarly, the frequent starts and high start-up percentage of electric heaters pose a significant challenge to their electrical components and lifespan. Adding a heat-conducting block maximizes heat transfer efficiency, ensuring uniform heating of the valve. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the technical description will be briefly introduced below.

[0022] Figure 1 This is a schematic diagram of the structure of the heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors provided by this utility model;

[0023] Figure 2 A front view of the heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors provided by this utility model;

[0024] Figure 3 A side view of the heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors provided by this utility model;

[0025] Figure 4 for Figure 2 A cross-sectional view along the AA direction.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Curved groove; 2. Rectangular plane; 3. Center hole;

[0028] a. Length of the heat-conducting block; b. Length of the heat-conducting block; c. Length of the rectangular hole; d. Width of the rectangular hole; h. Maximum thickness of the heat-conducting block; R. Radius of the arc surface. Detailed Implementation

[0029] The following detailed description provides further details on specific implementation methods.

[0030] like Figures 1 to 4 As shown, this utility model provides a heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors, which can improve the efficiency of the electric heating blocks in sodium valves. The heat-conducting block is installed between the valve and the electric heating block, and the heat-conducting block is a rectangular concave structure. A curved groove 1 is formed on the front side of the heat-conducting block, and the curved groove 1 is curved in shape (i.e., part of a sphere). The back side of the heat-conducting block is a rectangular plane 2, and the whole is rectangular in shape. A central hole 3 is formed in the middle of the heat-conducting block, and the length and width of the front side of the heat-conducting block are arc-shaped. The curved groove 1 can be determined according to the arc shape of the valve body on site.

[0031] like Figure 2 As shown, the heat-conducting block has a symmetrical structure both vertically and horizontally.

[0032] Based on the dimensional measurements of the electric heating block and the sodium valve body, and adhering to the principle of maximizing the contact heat transfer area as much as possible, the size of the heat-conducting block also needs to be designed according to the shape of the outer surface of the sodium valve body and the gap space between the electric heating block. The length a of the heat-conducting block is 100±0.2mm, the width b is 150±0.2mm, and the radius R of the arc surface is 100mm~103mm, which fits the valve seat body and reduces the gap between the valve and the electric heating block.

[0033] Preferably, the central hole 3 is a rectangular hole. The rectangular hole is located at the exact center of the heat-conducting block, and its length and width directions are aligned with those of the heat-conducting block.

[0034] Preferably, the length c of the rectangular hole is 73.5mm to 73.6mm, and the width d is 53.5mm to 53.6mm.

[0035] like Figure 3 and Figure 4As shown, the maximum thickness h of the heat-conducting block is 24.5 mm. The maximum thickness is located at the four corners of the heat-conducting block.

[0036] In one embodiment, aluminum or copper is selected as the material for the heat-conducting block, i.e., an aluminum heat-conducting block or a copper heat-conducting block is used. Aluminum has a thermal conductivity of 121–151 W / m·K and a melting point of 660°C; copper has a thermal conductivity of 401 W / (m·K) and a melting point of 1083.4°C. These two materials are suitable for the working environment of heat-conducting blocks and are suitable for adding heat-conducting blocks to valves and electric heating blocks.

[0037] The usage process of this utility model is as follows:

[0038] 1) After the sodium valve is installed on the pipeline, fix the two heat-conducting blocks on both sides of the sodium valve body;

[0039] 2) After the heat-conducting block is fixed, attach the two sodium valve electric heating blocks to the outside of the valve body and the heat-conducting block;

[0040] 3) Install insulation on the outside of the sodium valve electric heater and complete the wiring of the sodium valve electric heater.

[0041] The heat-conducting block of this invention increases the heat transfer area between the valve and the electric heating block, improving heat transfer and reducing the temperature of the electric heating block. By adding a heat-conducting block outside the valve seat boss and increasing the thickness of the groove at the bottom of the electric heating block, it is confirmed that the valve seat boss and the heat transfer pad are tightly fitted to the electric heating block.

[0042] When in use, by installing the heat-conducting block of this utility model, the gap between the sodium valve and the electric heating block is significantly reduced, thereby increasing the heat conduction effect.

[0043] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors, characterized in that, The heat-conducting block has a curved groove (1) on the front and a rectangular plane (2) on the back. A central hole (3) is provided in the middle of the heat-conducting block. The radius of the curved groove (1) is 100mm to 103mm. The length of the heat-conducting block is 99.8mm to 100.2mm and the width is 149.8mm to 150.2mm.

2. The heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors according to claim 1, characterized in that, The central hole (3) is a rectangular hole.

3. The heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors according to claim 2, characterized in that, The central hole (3) is arranged at the very center of the heat-conducting block, and its length direction is the same as that of the heat-conducting block.

4. The heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors according to claim 2 or 3, characterized in that, The length of the central hole (3) is 73.5mm to 73.6mm and the width is 53.5mm to 53.6mm.

5. The heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors according to claim 1, characterized in that, The maximum thickness of the heat-conducting block is 24.5 mm.

6. The heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors according to claim 1, characterized in that, The maximum thickness of the heat-conducting block is located at the four corners.

7. The heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors according to claim 1, characterized in that, The heat-conducting block has a symmetrical structure both vertically and horizontally.

8. The heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors according to claim 1, characterized in that, The heat-conducting block is an aluminum heat-conducting block.

9. The heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors according to claim 1, characterized in that, The heat-conducting block is a copper heat-conducting block.

10. The heat-conducting block for sodium valves and electric heating blocks in sodium-cooled fast reactors according to claim 1, characterized in that, The radius of the curved groove (1) is 100mm to 103mm.

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