Stainless steel gasket for enhancing heat conduction of electric heating wire of sodium-cooled fast reactor
By installing a stainless steel gasket between the electric heating wire and the equipment, the problem of low heat transfer efficiency of the electric heating wire in the sodium-cooled fast reactor was solved, a faster heating rate and higher heat transfer efficiency were achieved, the service life of the electric heating wire was extended, and the failure rate and operating temperature were reduced.
Patent Information
- Application Number
- CN202422660006.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-11-01
AI Technical Summary
The contact area between the electric heating wire and the equipment in the sodium-cooled fast reactor is small, resulting in poor heat transfer efficiency and increased temperature, which affects safety and lifespan. In addition, the design and installation method causes the electric heating wire to expand and bend, deteriorating heat transfer.
A stainless steel gasket is installed between the electric heating wire and the equipment. It is designed as a slender U-shaped structure with a semicircular concave recess and vertical side walls to increase the contact area. It is fixed by spot welding to improve the heat transfer effect.
Significantly reduce the temperature of the electric heating wire, extend its service life, improve heat transfer efficiency, reduce the failure rate, ensure stable operation of the equipment, and save energy and reduce emissions.
Smart Images
Figure CN223331367U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sodium-cooled fast reactor electric heating wires, in particular to a stainless steel gasket for enhancing the heat conduction of sodium-cooled fast reactor electric heating wires. Background Art
[0002] The sodium-cooled fast reactor system features numerous external electric heating wires installed on equipment and piping. After the heating wires were put into operation, an abnormally high room temperature was observed on-site. Upon removing the insulation, the heating wires were found to have turned black. Judging by their color, the temperature during operation was at least 400-500°C. Most of the heat from the heating wires was dissipated into the environment, causing the room temperature to rise excessively, compromising the safety of workers.
[0003] After on-site verification and analysis by power plant personnel, the main reasons for the blackening of the electric heating wire are:
[0004] 1. The contact area between the electric heating wire and the equipment body is small or non-contact, resulting in poor heat transfer efficiency;
[0005] 2. During the operation of the electric heating wire, the temperature far exceeds that of the equipment body, causing the expansion of the electric heating wire to be greater than that of the equipment. The gap between the electric heating wire and the equipment is further increased, and the heat transfer is deteriorated;
[0006] 3. In the original design, the electric heating wire was installed by using a metal pressing sheet (10mm wide, 40-50mm long) to fix the electric heating wire on the surface of the equipment and pipeline at intervals of 10CM. Therefore, during the heating process, the electric heating wire heated up, expanded, and bent.
[0007] This situation not only leads to poor heat transfer performance of the electric heating wire, but also significantly shortens its service life. From an engineering construction perspective, poor heat transfer performance of electric heating can lead to long-term high temperatures in the room, potentially endangering the structural strength of the structure, making it difficult for electrical equipment and instrumentation and control equipment to maintain stable operation and shortening their service life. Utility Model Content
[0008] The utility model aims to provide a stainless steel gasket for enhancing the heat conduction of electric heating wires of sodium-cooled fast reactors, thereby solving the problems of low efficiency of electric heating wires in sodium-related systems and slow temperature rise of heated objects in sodium-cooled fast reactor projects.
[0009] In order to achieve the above purpose, the present invention provides the following technical solutions:
[0010] A stainless steel gasket for enhancing the thermal conductivity of an electric heating wire of a sodium-cooled fast reactor is installed between a pipeline, equipment, and an armored electric heater. The stainless steel gasket has a length of 700 to 750 mm, a width of 5.5 to 5.8 mm, and a height of 2.7 to 2.9 mm. The stainless steel gasket comprises a top, a recess, and a bottom. The recess is provided between two tops and is a semicircular concave structure with a diameter of 4.1 to 4.2 mm. The bottom has a concave curvature of 0.1 to 0.2 mm.
[0011] As an practicable manner, the center thickness of the stainless steel gasket is ≤0.75 mm.
[0012] As an implementable manner, the concave portion is a semicircular concave portion with a diameter of Φ4.16 mm.
[0013] As an practicable manner, the recess is provided in the middle of the two top portions.
[0014] As an practicable manner, the concave curve of the bottom is a smooth curve.
[0015] As an practicable manner, the stainless steel gasket is bilaterally symmetrical.
[0016] As an practicable manner, the side walls of the stainless steel gasket are vertical planes, and the side walls on both sides are symmetrically arranged.
[0017] As an practicable manner, the side wall has a length of 700-750 mm and a width of 2.7-2.9 mm.
[0018] As an practicable manner, the concave portion is a semicircular concave structure of Φ4.16 mm.
[0019] As an practicable manner, the stainless steel gasket is made of 304 stainless steel.
[0020] Compared with the prior art, the stainless steel gasket for enhancing the thermal conductivity of the electric heating wire of a sodium-cooled fast reactor provided by the present invention has the following beneficial effects:
[0021] The stainless steel gasket provided by this utility model improves heat transfer between the electric heating wire and the equipment. Installing the stainless steel gasket between the pipe, the equipment, and the armored electric heater, and securing it with a stainless steel pressing plate, increases the contact area with the equipment and improves heat transfer. The stainless steel gasket meets the operating requirements of the heating wire, effectively fitting the heated heating wire to the stainless steel gasket, significantly reducing the temperature of the heating wire, extending its lifespan, and reducing its failure rate.
[0022] After testing, it was found that adding a stainless steel gasket between the electric heating wire and the equipment surface can significantly improve heat transfer, reducing the heating time to 58.12% of the original and the heat dissipation of the pipeline to 75.63% of the original.
[0023] After adding a stainless steel gasket to the electric heating wire, the operating temperature of the electric heating wire can be greatly reduced from about 450℃ to below 300℃. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the technical description.
[0025] Figure 1 This is a front view of a stainless steel gasket provided by the present invention for enhancing the heat conduction of an electric heating wire of a sodium-cooled fast reactor;
[0026] Figure 2 This is a schematic diagram from a top view of a stainless steel gasket provided by the present invention for enhancing the thermal conductivity of an electric heating wire of a sodium-cooled fast reactor.
[0027] Description of reference numerals:
[0028] 1. Top; 2. Recess; 3. Bottom; 4. Side wall. DETAILED DESCRIPTION
[0029] The following is further detailed description through specific implementation methods.
[0030] The utility model provides a stainless steel gasket (hereinafter referred to as the stainless steel gasket) for enhancing the thermal conductivity of the electric heating wire of a sodium-cooled fast reactor. The stainless steel gasket is installed between the pipeline, the equipment and the armored electric heater, and is fixed by a stainless steel pressing sheet (0.2mm thick, made of 316L).
[0031] like Figure 1 and Figure 2 As shown, the stainless steel gasket is an elongated U-shaped structure with bilateral symmetry. The axial length of the stainless steel gasket is 700-750 mm, the height is 2.7-2.9 mm, and the width is 5.5-5.8 mm.
[0032] The stainless steel gasket has a top 1 , a recess 2 , a bottom 3 and side walls 4 on both sides.
[0033] Recess 2 is a semicircular concave structure with a diameter of 4.1 to 4.2 mm. The outer diameter of the electric heating wire used on site is approximately 3.9 to 4 mm. The stainless steel gasket adopts a semicircular concave structure with a diameter of 4.1 to 4.2 mm, which allows for a better fit between the electric heating wire and the gasket. The semicircular concave structure is arranged in the middle of the stainless steel gasket. The two sides of the semicircular concave structure form upwardly convex tops 1, which are arranged on both sides of recess 2. The two tops 1 have the same width to facilitate the installation of the fixed pressing plate.
[0034] Preferably, the concave portion 2 is in a semicircular concave shape of Φ4.16 mm.
[0035] The width of the top 1 is, for example, 0.7 to 0.8 mm. This design allows the heat of the electric heating wire to be conducted to the heating target, reducing heat dissipation to the surrounding environment; it also plays a certain fixing and protective role, preventing the electric heating wire from heating, expanding, and bending during operation.
[0036] The bottom 3 is a structure with a certain degree of concavity, and its concavity curve is a smooth curve. The curvature of the lower concavity is about 0.1 to 0.2 mm. The surfaces of on-site pipelines and equipment are mostly arc-shaped structures. Designing the bottom as a 0.1 to 0.2 mm concave arc surface can make the gasket fit well with the surface of the pipeline and equipment.
[0037] The center thickness of the stainless steel gasket is ≤0.75mm, that is, the distance L between the lowest point of the depression of the bottom 3 and the lowest point of the depression of the recess 2 is ≤0.75mm, ensuring that the stainless steel gasket is fully fitted with the electric heating wire, while allowing more heat to be conducted to the surface of the pipeline and equipment.
[0038] The side wall 4 is a vertical plane, and is an elongated rectangular structure as a whole, with a length of 700-750 mm and a width (height of the stainless steel gasket) of 2.7-2.9 mm. The side walls 4 on both sides are symmetrically arranged.
[0039] Optionally, the stainless steel gasket is made of 304 stainless steel.
[0040] The stainless steel gasket provided by the utility model can improve the heat transfer between the electric heating wire and the equipment, and overcome the problems of slow and uneven heating speed during the commissioning and operation of the electric heating wire in the sodium-cooled fast reactor project, and even failure to reach the target temperature.
[0041] The usage of this utility model is as follows:
[0042] Step 1: Mark the installation location of the electric heating wire on the equipment and pipeline;
[0043] Step 2: Place the electric heating wire into the recess 2 of the stainless steel gasket and fit it into place;
[0044] Step 3: Fix the electric heating wire and stainless steel gasket by spot welding the stainless steel pressing plate (the spacing requirement is 100mm).
[0045] After installing the stainless steel gasket, the contact area with the equipment can be increased, improving heat transfer. The stainless steel gasket can meet the operating requirements of the heating wire. After the heating wire is heated, it can effectively fit the gasket, which can significantly reduce the temperature of the electric heating wire, extend the life of the electric heating, and reduce the failure rate of the electric heating wire.
[0046] From the actual application effect, the heating efficiency of electric heating wire is low when it is directly installed. The reason is that the heat conduction and convection heat transfer capacity of air is limited, and the external armored electric heating wire is not suitable for direct installation.
[0047] The utility model realizes that the sodium-cooled fast reactor electric heating wire stably and safely reaches the target temperature by means of adding a stainless steel metal gasket on the outside of the armored electric heating wire.
[0048] Furthermore, the present invention can improve the stability of electric heating operation. For sodium-related equipment and pipelines, frequent temperature fluctuations can negatively impact material fatigue and localized overheating. Similarly, frequent activations and high activation percentages of electric heaters significantly impact the lifespan of their electrical components.
[0049] This utility model achieves energy conservation and emission reduction, cost reduction and efficiency improvement. The operating temperature of the electric heating block will be greatly reduced. Under the condition of unchanged insulation form, the use of external stainless steel gaskets greatly reduces the heat loss of electric heating.
[0050] The above description is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.
Claims
1. A stainless steel gasket for enhancing the thermal conductivity of a sodium-cooled fast reactor electric heating wire, characterized in that: The stainless steel gasket is installed between the pipeline, the equipment and the armored electric heater. The length of the stainless steel gasket is 700-750 mm, the width is 5.5-5.8 mm, and the height is 2.7-2.9 mm. The stainless steel gasket has a top (1), a recess (2) and a bottom (3). The recess (2) is arranged between the two tops (1). The recess (2) is a semicircular concave structure with a diameter of Φ4.1-4.2 mm. The bottom (3) has a concave curvature of 0.1-0.2 mm.
2. The stainless steel gasket for enhancing the thermal conductivity of the electric heating wire of a sodium-cooled fast reactor according to claim 1, characterized in that: The center thickness of the stainless steel gasket is ≤0.75 mm.
3. The stainless steel gasket for enhancing the thermal conductivity of the electric heating wire of a sodium-cooled fast reactor according to claim 1, characterized in that: The concave portion (2) is a semicircular concave with a diameter of Φ4.16 mm.
4. The stainless steel gasket for enhancing the thermal conductivity of the electric heating wire of a sodium-cooled fast reactor according to claim 1, characterized in that: The recess (2) is provided in the middle of the two top portions (1).
5. The stainless steel gasket for enhancing the thermal conductivity of the electric heating wire of a sodium-cooled fast reactor according to claim 1, characterized in that: The concave curve of the bottom (3) is in the shape of a smooth curve.
6. The stainless steel gasket for enhancing the thermal conductivity of the electric heating wire of a sodium-cooled fast reactor according to claim 1, characterized in that: The stainless steel gasket is bilaterally symmetrical.
7. The stainless steel gasket for enhancing the thermal conductivity of the electric heating wire of a sodium-cooled fast reactor according to claim 1, characterized in that: The side walls (4) of the stainless steel gasket are vertical planes, and the side walls (4) on both sides are symmetrically arranged.
8. The stainless steel gasket for enhancing the thermal conductivity of the electric heating wire of a sodium-cooled fast reactor according to claim 7, characterized in that: The side wall (4) has a length of 700-750 mm and a width of 2.7-2.9 mm.
9. The stainless steel gasket for enhancing thermal conductivity of electric heating wires of sodium-cooled fast reactors according to claim 1, characterized in that: The concave portion (2) is a semicircular concave structure with a diameter of 4.16 mm.
10. The stainless steel gasket for enhancing the thermal conductivity of the electric heating wire of a sodium-cooled fast reactor according to claim 1, characterized in that: The stainless steel gasket is made of 304 stainless steel.