Lateral heating type fused salt electric heater
Through the lateral heating design and staggered arrangement of the inlet and outlet pipes, as well as the staggered arrangement and threaded connection of the electric heating pipes, the low heat exchange efficiency and corrosion problems of existing molten salt electric heaters are solved, and the problem of low heat exchange efficiency and corrosion of existing molten salt electric heaters is achieved. Efficient heating and corrosion reduction, extending the life of the equipment.
Patent Information
- Application Number
- CN202420223346.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-01-30
AI Technical Summary
The existing molten salt electric heaters have problems with low heat exchange efficiency and high-temperature molten salt corrosion during the heating process, which affects the service life.
Using a lateral heating molten salt electric heater, the staggered arrangement and contour design of the inlet and outlet pipes can achieve sufficient heat absorption and heat increase of molten salt, and the staggered arrangement of the molten salt on the support frame through the electric heating pipe. The fabric and threaded connection improve heating uniformity and facilitate maintenance, while reducing thermal stress using elastic deformation.
It improves heat transfer efficiency, reduces the corrosion degree and rate of high-temperature molten salt, extends the service life of the equipment, and reduces the damage to the structure by thermal stress through elastic deformation parts.
Smart Images
Figure CN222210768U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electric heating, and in particular to a side-heating molten salt electric heater. Background Art
[0002] New energy storage is an important technology and basic equipment for building a new power system.
[0003] Molten salt energy storage, as a medium- and high-temperature heat transfer and storage method, is an important component of new energy storage. Due to its advantages such as high energy storage density, strong heat transfer capacity and high stability, it is widely used in new energy fields such as solar lighting systems, peak load and frequency regulation, and green electricity consumption. It is currently the first choice for large-scale, long-term medium- and high-temperature heat storage technology.
[0004] In addition, it is also suitable for solar thermal power generation, flexible transformation of thermal power, waste heat recovery and utilization, clean heating, etc. It is one of the key technologies for building a new energy storage system in the future.
[0005] The molten salt electric heater disclosed in the prior art usually arranges a plurality of slender straight tubes in a hollow tank body, and then further increases the temperature of the molten salt flowing through the straight tubes through a heating unit in the tank body.
[0006] However, this form of warming may lead to two situations. The first is that the heat exchange efficiency is low and the outlet temperature of the molten salt cannot meet the expected demand. The second is that although the outlet temperature can meet the requirements, the molten salt temperature is too high, resulting in a greater degree of corrosion to the straight pipe, which in turn affects the service life of the molten salt electric heater, which is obviously insufficient. Utility Model Content
[0007] In order to improve thermal efficiency and ensure the service life of the electric heater, the present application provides a side-heating molten salt electric heater.
[0008] The side-heating molten salt electric heater provided in this application adopts the following technical solution:
[0009] A side-heating molten salt electric heater comprises a flow delivery component for supplying liquid molten salt to flow, and a temperature-increasing component for further heating the flowing molten salt in the flow delivery component, wherein the flow delivery component comprises a liquid inlet main pipe and a liquid outlet main pipe, the liquid inlet main pipe is connected to a plurality of liquid inlet branch pipes, the liquid outlet main pipe is connected to a plurality of liquid outlet branch pipes, the liquid inlet branch pipes and the liquid outlet branch pipes are connected through an internal hollow flow exchange chamber, a plurality of liquid inlet branch pipes and a plurality of liquid outlet branch pipes are staggered along the length direction of the flow exchange chamber, and the liquid inlet branch pipes are at the same height except for the parts close to the liquid inlet main pipe and the parts close to the liquid outlet main pipe.
[0010] By adopting the above technical solution, the liquid molten salt at about 300°C is divided from the liquid inlet main pipe to each liquid inlet branch pipe. The molten salt in the liquid inlet branch pipe is collected in the exchange chamber and then divided again to each liquid outlet branch pipe, and finally flows out from the liquid outlet main pipe. Since the flow path of the molten salt in the liquid inlet branch pipe and the liquid outlet branch pipe is long, it has sufficient heat absorption and temperature increase, and the heat transfer efficiency is high. At the same time, based on the fact that the higher the temperature of the molten salt, the stronger the corrosion, since the liquid outlet branch pipe and most of the pipe bodies of the liquid inlet branch pipe are at the same height, the molten salt flowing out of the liquid outlet branch pipe itself is a heat source relative to the molten salt in the liquid inlet branch pipe, so the heat on the liquid outlet branch pipe will also be transferred to the liquid inlet branch pipe, which forces the temperature of the molten salt in the liquid inlet branch pipe and the liquid outlet branch pipe to approach isothermal, thereby not only ensuring high heat transfer efficiency, but also the temperature of the liquid outlet branch pipe can be controlled within a limited range, reducing the degree and rate of corrosion of the high-temperature molten salt on the liquid outlet branch pipe.
[0011] Optionally, the temperature increasing component includes a supporting frame and a plurality of unit heating parts arranged on the supporting frame, the unit heating parts include a junction box located outside the supporting frame, the junction box is electrically connected to a plurality of electric heating tubes, and the electric heating tubes all extend into the supporting frame.
[0012] By adopting the above technical solution, the electric heating tube generates heat after being energized, and the heat is dissipated to the liquid outlet pipe and the liquid inlet pipe, thereby further heating and increasing the temperature of the molten salt.
[0013] Optionally, a plurality of unit heating parts are located on both sides of the support frame relative to the flow direction of the molten salt and are arranged in a staggered manner.
[0014] By adopting the above technical solution, the staggered arrangement of multiple unit heating parts is beneficial to improving the uniformity of overall heating in the molten salt electric heater, and reducing the possibility of uneven or insufficient heating in some areas.
[0015] Optionally, a threaded sleeve is arranged on the support frame at a position corresponding to each electric heating tube, and the electric heating tube is threadedly connected to the corresponding threaded sleeve.
[0016] By adopting the above technical solution, the threaded connection realizes a detachable connection of the electric heating tube on the support frame, so that when the electric heating tube is damaged, workers can replace it individually.
[0017] Optionally, the liquid inlet branch pipe and the liquid outlet branch pipe are arranged in a serpentine shape, and at least one temperature increasing component is arranged in each arrangement gap of the liquid inlet branch pipe and the liquid outlet branch pipe.
[0018] By adopting the above technical solution, multiple temperature-increasing components cooperate to achieve full-path temperature increase of the molten salt flowing in the liquid outlet branch pipe and the liquid inlet branch pipe, thereby improving the adequacy of the temperature increase of the molten salt.
[0019] Optionally, a plurality of load-bearing beams are arranged in the support frame, a plurality of support beams are arranged on each load-bearing beam, and the electric heating tube slides through the support beams.
[0020] By adopting the above technical solution, the load-bearing beam can improve the overall structural strength of the load-bearing frame, and the support beam can provide a stable support point for the length direction of the electric heating tube.
[0021] Optionally, elastic deformable parts are arranged at both ends of the load-bearing beam, and the elastic deformable parts include a mounting plate arranged at the end of the load-bearing beam, and an end plate arranged on the mounting plate and connected to the support frame, and there is a distance between the mounting plate and the support frame.
[0022] By adopting the above technical solution, during the operation of the molten salt electric heater, the load-bearing beam is heated to generate thermal stress. Since the mounting plate and the end plate are elastic, the load-bearing beam can eliminate the thermal stress through thermal expansion and contraction, thereby reducing the possibility of structural damage due to the inability to release thermal stress.
[0023] Optionally, a waist-shaped groove is provided on the end plate, and the end plate is connected to the support frame by fastening bolts, and the fastening bolts pass through the waist-shaped groove.
[0024] By adopting the above technical solution, the setting of the waist-shaped groove reserves sufficient clearance for the deformation and position deviation of the elastic deformation member, thereby enhancing the effect of eliminating thermal stress.
[0025] In summary, the present application includes at least one of the following beneficial technical effects:
[0026] 1. Since the flow path of the molten salt in the liquid inlet and outlet pipes is long, it can fully absorb heat and increase temperature, and the heat transfer efficiency is high. At the same time, based on the fact that the higher the temperature of the molten salt, the stronger the corrosiveness, since the outlet pipe and most of the inlet pipe are at the same height, the molten salt flowing out of the outlet pipe is a heat source relative to the molten salt in the inlet pipe, so the heat on the outlet pipe will also be transferred to the inlet pipe, which forces the temperature of the molten salt in the inlet and outlet pipes to approach isothermal, thereby not only ensuring high heat transfer efficiency, but also controlling the temperature of the outlet pipe within a limited range, reducing the degree and rate of corrosion of the outlet pipe by high-temperature molten salt;
[0027] 2. During the operation of the molten salt electric heater, the load-bearing beam is heated and generates thermal stress. Since the mounting plate and the end plate are elastic, the load-bearing beam can eliminate the thermal stress through thermal expansion and contraction, thereby reducing the possibility of structural damage due to the inability to release thermal stress. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application.
[0029] Figure 2 It is a schematic diagram of the positional relationship between the liquid inlet main pipe, the liquid inlet branch pipes, the liquid outlet branch pipes and the liquid outlet main pipe in the embodiment of the present application.
[0030] Figure 3 It is a schematic diagram of the structure of the support frame, electric heating tube and load-bearing beam in the embodiment of the present application.
[0031] Figure 4 It is a schematic diagram of the positional relationship between the load-bearing beam, the support beam, the mounting plate and the end plate in the embodiment of the present application.
[0032] Explanation of the reference numerals in the accompanying drawings: 1. Liquid inlet main pipe; 2. Liquid outlet main pipe; 3. Liquid inlet branch pipe; 4. Liquid outlet branch pipe; 5. Converter chamber; 6. Support frame; 71. Junction box; 72. Electric heating tube; 9. Load-bearing beam; 10. Support beam; 111. Mounting plate; 112. End plate; 1121. Waist-shaped groove; 12. Fastening bolts. DETAILED DESCRIPTION
[0033] The following is combined with Figure 1-4 This application is described in further detail.
[0034] The embodiment of the present application discloses a side-heating molten salt electric heater.
[0035] Reference Figure 1 and Figure 2 The side-heating molten salt electric heater includes a flow delivery component for supplying liquid molten salt to flow, and a temperature increasing component for further heating and increasing the temperature of the flowing molten salt in the flow delivery component.
[0036] The flow delivery component includes a liquid inlet main pipe 1 and a liquid outlet main pipe 2 which are parallel to each other. The liquid inlet main pipe 1 is connected to multiple liquid inlet branch pipes 3, and the liquid outlet main pipe 2 is connected to multiple liquid outlet branch pipes 4. The liquid inlet branch pipes 3 and the liquid outlet branch pipes 4 are both serpentine and connected through an internal hollow exchange chamber 5.
[0037] The liquid inlet branch pipes 3 and the liquid outlet branch pipes 4 are arranged alternately along the length direction of the exchange chamber 5. Except for the parts close to the liquid inlet main pipe 1, the parts close to the liquid outlet main pipe 2 of the liquid inlet branch pipes 3 and the parts close to the liquid outlet main pipe 2 of the liquid outlet branch pipes 4 are of equal height.
[0038] Reference Figure 1 and Figure 2 The liquid molten salt at about 300°C is divided from the liquid inlet main pipe 1 to each liquid inlet branch pipe 3. The molten salt in the liquid inlet branch pipe 3 is collected in the exchange chamber 5 and then divided again to each liquid outlet branch pipe 4, and finally flows out from the liquid outlet main pipe 2.
[0039] On the one hand, since the flow path of the molten salt in the liquid inlet branch pipe 3 and the liquid outlet branch pipe 4 is relatively long, it has sufficient heat absorption and temperature increase, and has high heat transfer efficiency.
[0040] On the other hand, based on the fact that the higher the temperature of the molten salt, the stronger its corrosiveness, since the liquid outlet branch pipe 4 is at the same height as most of the liquid inlet branch pipe 3, the molten salt flowing out of the liquid outlet branch pipe 4 is itself a heat source relative to the molten salt in the liquid inlet branch pipe 3. Therefore, the heat on the liquid outlet branch pipe 4 will also be transferred to the liquid inlet branch pipe 3, which forces the temperatures of the molten salts in the liquid inlet branch pipe 3 and the liquid outlet branch pipe 4 to approach isothermal, thereby not only ensuring high heat transfer efficiency, but also controlling the temperature of the liquid outlet branch pipe 4 within a limited range, thereby reducing the degree and rate of corrosion of the high-temperature molten salt on the liquid outlet branch pipe 4.
[0041] Reference Figure 1 , Figure 2 and Figure 3 A temperature increasing component is arranged in each arrangement gap of the liquid inlet branch pipe 3 and the liquid outlet branch pipe 4, and the temperature increasing component includes a support frame 6 made of a high-temperature resistant alloy and a plurality of unit heating parts arranged on the support frame 6.
[0042] Reference Figure 3 , multiple unit heating parts are distributed on both sides of the support frame 6 in the length direction and are staggered relative to the flow direction of the molten salt. The unit heating part includes a junction box 71 located outside the support frame 6, and 6 parallel electric heating tubes 72 are electrically connected to the junction box 71. The electric heating tubes 72 extend into the support frame 6.
[0043] Reference Figure 2 and Figure 3 , the electric heating tube 72 is energized, the electric heating tube 72 generates heat, and the heat is dissipated in four directions to the liquid inlet branch pipe 3 and the liquid outlet branch pipe 4, so as to increase the temperature of the molten salt.
[0044] Reference Figure 3 , a threaded sleeve (not shown) is bolted to the position of each electric heating tube 72 on the support frame 6, and the electric heating tube 72 is threadedly connected to the corresponding threaded sleeve. Through the threaded connection between the threaded sleeve and the electric heating tube 72, when the electric heating tube 72 is damaged, the worker can replace the damaged electric heating tube 72 separately.
[0045] Reference Figure 3 and Figure 4 A plurality of load-bearing beams 9 parallel to the width direction are arranged in the support frame 6 along the length direction thereof. The cooperation of the plurality of load-bearing beams 9 can improve the structural strength of the support frame 6 .
[0046] A plurality of support beams 10 are arranged on each load-bearing beam 9, and the electric heating tube 72 slides through the support beams 10. Since the electric heating tube 72 is relatively long, the cooperation of the plurality of support beams 10 can provide a plurality of stable support points for the electric heating tube 72.
[0047] Reference Figure 3 and Figure 4 Since the electric heater of the present application will heat up to a relatively high temperature when working, a relatively large thermal stress will be generated in the load-bearing beam 9 .
[0048] To this end, elastic deformation members are arranged at both ends of the load-bearing beam 9, and the elastic deformation members include a mounting plate 111 bolted to the end of the load-bearing beam 9, and there is a distance between the mounting plate 111 and the support frame 6. Two end plates 112 are integrally formed on the mounting plate 111, and the end plates 112 are bolted to the support frame 6 by fastening bolts 12. The end plates 112 are provided with waist-shaped grooves 1121, and the fastening bolts 12 pass through the waist-shaped grooves 1121.
[0049] Reference Figure 3 and Figure 4 Since the mounting plate 111 and the end plate 112 are made of metal with a certain elasticity, when thermal stress is generated in the load-bearing beam 9, the load-bearing beam 9 can force the elastic deformable part to undergo a certain deformation due to thermal expansion and contraction, thereby eliminating the thermal stress in the load-bearing beam 9 and reducing the possibility of thermal stress causing damage to the structure.
[0050] The setting of the waist-shaped groove 1121 further reserves sufficient clearance for the deformation and position deviation of the elastic deformable member, thereby enhancing the effect of eliminating thermal stress.
[0051] In addition, the support beam 10 and the load-bearing beam 9 , as well as the support beam 10 and the support frame 6 are connected by elastic deformation members, thereby further improving the effect of eliminating thermal stress in various components in the support frame 6 .
[0052] The present application has the advantages of high heating efficiency, modular assembly, and light structure, and is particularly suitable for polysilicon radiation heating furnaces, high-temperature and high-pressure reaction furnaces, and cracking furnaces.
[0053] The implementation principle of a side-heating molten salt electric heater in the embodiment of the present application is as follows: liquid molten salt at about 300°C is diverted from the liquid inlet main pipe 1 to each liquid inlet branch pipe 3, and the molten salt in the liquid inlet branch pipe 3 is collected in the exchange chamber 5 and then diverted to each liquid outlet branch pipe 4 again, and finally flows out from the liquid outlet main pipe 2. Since the liquid outlet branch pipe 4 is at the same height as most of the tube body of the liquid inlet branch pipe 3, the molten salt flowing out of the liquid outlet branch pipe 4 is itself a heat source relative to the molten salt in the liquid inlet branch pipe 3, so the heat on the liquid outlet branch pipe 4 will also be transferred to the liquid inlet branch pipe 3. When the electric heating tube 72 is energized, the electric heating tube 72 generates heat, and the heat is dissipated in four directions to the liquid inlet branch pipe 3 and the liquid outlet branch pipe 4, thereby increasing the temperature of the molten salt.
[0054] During the operation of the molten salt electric heater, when thermal stress is generated in the load-bearing beam 9 and the support beam 10, the load-bearing beam 9 and the support beam 10 can force the elastic deformable parts to undergo a certain deformation due to thermal expansion and contraction, thereby eliminating the thermal stress in the load-bearing beam 9 and reducing the possibility of thermal stress causing damage to the structure.
[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A lateral heating molten salt electric heater, comprising a flow delivery component for supplying liquid molten salt to flow, and a temperature increasing component for further heating the flowing molten salt in the flow delivery component, characterized in that: The flow delivery component comprises a liquid inlet main pipe (1) and a liquid outlet main pipe (2); the liquid inlet main pipe (1) is connected to a plurality of liquid inlet branch pipes (3); the liquid outlet main pipe (2) is connected to a plurality of liquid outlet branch pipes (4); the liquid inlet branch pipes (3) and the liquid outlet branch pipes (4) are connected via an internal hollow flow exchange chamber (5); the plurality of liquid inlet branch pipes (3) and the plurality of liquid outlet branch pipes (4) are arranged alternately along the length direction of the flow exchange chamber (5); the liquid inlet branch pipes (3) except for the portion close to the liquid inlet main pipe (1) and the liquid outlet branch pipes (4) except for the portion close to the liquid outlet main pipe (2) are of the same height as each other.
2. The side-heating molten salt electric heater according to claim 1 is characterized in that: The temperature increasing component comprises a supporting frame (6), and a plurality of unit heating parts arranged on the supporting frame (6); the unit heating parts comprise a junction box (71) located outside the supporting frame (6); the junction box (71) is electrically connected to a plurality of electric heating tubes (72); and the electric heating tubes (72) all extend into the supporting frame (6).
3. The side-heating molten salt electric heater according to claim 2 is characterized in that: The plurality of unit heating parts are located on both sides of the support frame (6) relative to the flow direction of the molten salt and are arranged in a staggered manner.
4. The side-heating molten salt electric heater according to claim 2 is characterized in that: A threaded sleeve is arranged on the support frame (6) at a position corresponding to each electric heating tube (72), and the electric heating tube (72) is threadedly connected to the corresponding threaded sleeve.
5. The side-heating molten salt electric heater according to claim 1, characterized in that: The liquid inlet branch pipe (3) and the liquid outlet branch pipe (4) are arranged in a serpentine shape, and at least one temperature-increasing component is arranged in each arrangement gap of the liquid inlet branch pipe (3) and the liquid outlet branch pipe (4).
6. The side-heating molten salt electric heater according to claim 2, characterized in that: A plurality of load-bearing beams (9) are arranged in the support frame (6), a plurality of support beams (10) are arranged on each load-bearing beam (9), and the electric heating tube (72) slides through the support beams (10).
7. The side-heating molten salt electric heater according to claim 6, characterized in that: Both ends of the load-bearing beam (9) are provided with elastic deformation members, the elastic deformation members comprising a mounting plate (111) arranged at the end of the load-bearing beam (9), and an end plate (112) arranged on the mounting plate (111) and connected to the support frame (6), and a spacing is provided between the mounting plate (111) and the support frame (6).
8. The side-heating molten salt electric heater according to claim 7, characterized in that: The end plate (112) is provided with a waist-shaped groove (1121), and the end plate (112) is connected to the support frame (6) via a fastening bolt (12), and the fastening bolt (12) passes through the waist-shaped groove (1121).