Auxiliary heating device of steam generator electric heating wire
By installing a heat-conducting layer on the steam generator and fixing the electric heating wire on it, the problems of uneven heating and dry burning are solved, and uniform heating and load balance are achieved.
Patent Information
- Application Number
- CN202422442658.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-10-10
AI Technical Summary
In the existing technology, the electric heating wire of the steam generator is fixed by the heat-insulating keel clamp, which leads to uneven heating and poses a risk of dry burning.
The electric heating wire is fixed on a heat-conducting layer and connected by pressing and spot welding. The heat-conducting layer is in close contact with the steam generator. The surface of the heat-conducting layer has holes to reduce weight, and the electric heating wire is arranged in a serpentine pattern to increase the contact area.
It achieves uniform heating of the electric heating wire, reduces the risk of dry burning, and avoids the problem of excessive load on the steam generator.
Smart Images
Figure CN223553476U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of auxiliary facilities for steam generators, and specifically relates to an auxiliary heating device for an electric heating wire of a steam generator. Background Technology
[0002] Sodium-cooled fast reactors use metallic sodium as a coolant. The melting point of metallic sodium is 97.72℃. In order to keep the sodium medium in sodium-related equipment in a fluid state, an auxiliary heating device needs to be installed on the outer surface of the equipment for heating.
[0003] In existing technologies, sodium-cooled fast reactor pipelines and equipment are generally fixed to the surface of the pipelines and equipment by spot welding with pressure plates. However, this method is not suitable for steam generators. Currently, it is also possible to fix the electric heating wire to the steam generator with insulated keel clamps. However, this method is prone to dry burning of the electric heating wire near the clamps, and there is a risk of damage to the electric heating wire during long-term operation. Utility Model Content
[0004] This utility model proposes an auxiliary heating device for the electric heating wire of a steam generator, which solves the problem of uneven heating and dry burning of the electric heating wire caused by the method of fixing the auxiliary heating device of the steam generator by the heat-insulating keel clamp in the prior art.
[0005] The technical solution of this utility model:
[0006] This utility model proposes an auxiliary heating device for an electric heating wire of a steam generator. The device includes several heat-conducting layers, an electric heating wire, and a pressure plate. Two heat-conducting layers form a group, and the two ends of a group of heat-conducting layers are fixedly connected. One side of the heat-conducting layer is wrapped tightly around the surface of the steam generator, and the electric heating wire is provided on the other side of the heat-conducting layer. The electric heating wire is fixed to the heat-conducting layer by spot welding through the pressure plate.
[0007] In some embodiments, the heat-conducting layer is made of stainless steel, has a thickness of 1.2 mm, completely covers the steam generator, and is divided into 7-10 groups according to the height of the steam generator.
[0008] In some embodiments, the surface of the heat-conducting layer is provided with a plurality of holes, the holes being rectangular holes with a size of 20mm × 500mm, the holes reducing the mass of the heat-conducting layer.
[0009] In some embodiments, the distance between holes and between holes and the edge of the heat-conducting layer is greater than 50 mm.
[0010] In some embodiments, the total mass of all heat-conducting layers does not exceed 150 kg to prevent overloading of the steam generator.
[0011] In some embodiments, the heating wire is arranged in a serpentine pattern on the surface of the heat-conducting layer to increase the contact area between the heating wire and the heat-conducting layer.
[0012] In some embodiments, the electric heating wire is fixed by spot welding with stainless steel pressure plates every 100 mm in the straight section.
[0013] In some embodiments, the two ends of a set of thermally conductive layers are fixedly connected by a clamp.
[0014] The beneficial effects of this utility model are:
[0015] This invention proposes an auxiliary heating device for the electric heating wire of a steam generator. By installing the electric heating wire on the heat-conducting layer, this invention solves the problem of the electric heating wire being unable to be installed in the steam generator. There is no gap between the electric heating wire and the heat-conducting layer, and between the heat-conducting layer and the steam generator, which facilitates better heat conduction from the heating wire to the steam generator. The perforated surface of the heat-conducting layer greatly reduces its weight and solves the problem of excessive load on the steam generator. Attached Figure Description
[0016] Figure 1 An installation diagram of an auxiliary heating device for an electric heating wire of a steam generator designed for this utility model;
[0017] Figure 2 This is a schematic diagram of the heat-conducting layer segment of an auxiliary heating device for an electric heating wire in a steam generator according to this utility model;
[0018] Figure 3 This is a schematic diagram of the heat-conducting layer opening and the installation of the electric heating wire in an auxiliary heating device for an electric heating wire of a steam generator according to this utility model.
[0019] Attached diagram descriptions: 1. Steam generator; 2. Heat-conducting layer; 3. Electric heating wire; 4. Press plate; 5. Holes. Detailed Implementation
[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0021] like Figures 1 to 3 As shown, this utility model proposes an auxiliary heating device for an electric heating wire of a steam generator. The device includes several heat-conducting layers 2, an electric heating wire 3, and a pressing plate 4.
[0022] like Figure 2As shown, two heat-conducting layers 2 form a group, with both ends of the two heat-conducting layers 2 fixed by pipe clamps. The heat-conducting layers 2 are tightly attached to the surface of the steam generator 1. The heat-conducting layers 2 are made according to the external dimensions of the steam generator 1 and are made of stainless steel, with a thickness of 1.2mm. Since the steam generator 1 generally includes an upper end cap, a middle straight pipe section, and a lower end cap, and its length exceeds 20m, to facilitate the installation of the heat-conducting layers 2, the steam generator 1 can be divided into 7-10 sections from top to bottom. Each section is equipped with a group of heat-conducting layers 2. Each group of heat-conducting layers 2 needs to be tightly attached to the equipment. The diameter of each group of heat-conducting layers 2 is the same as that of the steam generator 1, and the total height of all groups of heat-conducting layers 2 is the same as that of the steam generator 1.
[0023] like Figure 3 As shown, holes were drilled and weighed on the surface of the heat-conducting layer 2. The number and form of the holes are as follows. Figure 3 As shown, each hole 5 is recommended to be a rectangle with a size of 20mm × 500mm. The distance between holes 5 and between holes 5 and the edge of the heat-conducting layer 2 should be greater than 50mm to ensure that the heat-conducting layer 2 has sufficient strength. The drilling method is not unique, but the total weight of all heat-conducting layers 2 should not exceed 150KG to prevent the steam generator 1 from being overloaded.
[0024] An electric heating wire 3 is provided on the surface of the heat-conducting layer 2, and the electric heating wire 3 is fixed to the heat-conducting layer 2 by spot welding. The electric heating wire 3 is evenly arranged in a serpentine pattern along the heat-conducting layer 2, and is fixed by spot welding with a stainless steel pressure plate 4 every 100 mm in the straight position.
[0025] This utility model proposes an auxiliary heating device for the electric heating wire of a steam generator. A test simulation of a steam generator 1 has been fabricated at a nuclear power plant site. Stainless steel sheet and electric heating wire 3 are installed according to this scheme. After the electric heating wire 3 is energized, the simulation is heated to 500°C. The electric heating wire 3 is operating well. After confirmation by the design department, it will be officially used on the unit in the future.
[0026] The embodiments of this utility model have been described in detail above. This utility model is not limited to the above examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model.
Claims
1. An auxiliary heating device for an electric heating wire in a steam generator, characterized in that, The device includes several heat-conducting layers (2), electric heating wires (3) and pressure plates (4). Two heat-conducting layers (2) form a group. The two ends of a group of heat-conducting layers (2) are fixedly connected. One side of the heat-conducting layer (2) is wrapped tightly around the surface of the steam generator (1). The other side of the heat-conducting layer (2) is provided with the electric heating wires (3). The electric heating wires (3) are spot-welded to the heat-conducting layers (2) by the pressure plates (4).
2. The auxiliary heating device for an electric heating wire in a steam generator according to claim 1, characterized in that, The heat-conducting layer (2) is made of stainless steel and has a thickness of 1.2 mm. The heat-conducting layer (2) is designed in 7-10 groups according to the height of the steam generator (1). The heat-conducting layer (2) completely covers the steam generator (1).
3. The auxiliary heating device for an electric heating wire in a steam generator according to claim 2, characterized in that, The surface of the heat-conducting layer (2) is provided with a plurality of holes (5), the holes (5) are rectangular holes with a size of 20mm×500mm, and the holes (5) reduce the mass of the heat-conducting layer (2).
4. The auxiliary heating device for an electric heating wire in a steam generator according to claim 3, characterized in that, The distance between the holes (5) and between the holes (5) and the edge of the heat-conducting layer (2) is greater than 50 mm.
5. An auxiliary heating device for an electric heating wire in a steam generator according to claim 4, characterized in that, The total mass of all the heat-conducting layers (2) shall not exceed 150 kg to prevent the steam generator (1) from being overloaded.
6. The auxiliary heating device for an electric heating wire in a steam generator according to claim 5, characterized in that, The electric heating wire (3) is arranged in a serpentine pattern on the surface of the heat-conducting layer (2) to increase the contact area between the electric heating wire (3) and the heat-conducting layer (2).
7. An auxiliary heating device for an electric heating wire in a steam generator according to claim 6, characterized in that, The electric heating wire (3) is fixed by spot welding with stainless steel pressure plates (4) every 100 mm in the straight section.
8. An auxiliary heating device for an electric heating wire in a steam generator according to claim 1, characterized in that, The two ends of the heat-conducting layers (2) of a set of heat-conducting layers (2) are fixedly connected by a pipe clamp.