A high-power electromagnetic induction heating molten salt energy storage test platform
Patent Information
- Application Number
- CN202522106704.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-09-30
AI Technical Summary
[0003]目前熔盐电加热技术主要以电热管式加热器为主，该方式存在加热器寿命短等不足
本实用新型所提供的大功率熔盐储能测试平台，既可用于熔盐储能系统实验室（生产厂），也可用于实际用户现场，为大功率电磁感应加热熔盐储能系统开发和应用提供能效评估和优化系统结构、参数提供参考依据。
Smart Images
Figure CN224803150U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of electrothermal energy storage, and specifically relates to a high-power electromagnetic induction heating molten salt energy storage test platform. Background Technology
[0002] In recent years, in order to accelerate the adjustment of the energy system to adapt to the large-scale application of new energy, various energy storage technologies have developed rapidly. Molten salt energy storage (thermal) technology has gradually matured and expanded in scale. A large number of molten salt energy storage solar thermal power plants, off-peak electricity steam supply projects based on molten salt energy storage, and coal-to-coal transformation projects based on molten salt energy storage are being planned, constructed, and put into operation. Most of these molten salt energy storage (thermal) application scenarios adopt high-power molten salt electric heating technology.
[0003] Currently, molten salt electric heating technology mainly relies on electric heating tube heaters, which suffer from drawbacks such as short heater lifespan. Electromagnetic induction heating of molten salt is a relatively new technology that addresses the problems of short lifespan, the large number of heating tubes required in series and parallel, and the difficulty in achieving high-voltage, high-power heating with electric heating tubes. Electromagnetic induction heating of molten salt utilizes induction (the principle of a transformer) to first heat a spiral metal pipe wound around the transformer core. This metal pipe then heats the molten salt, the energy storage medium (working fluid), flowing within it. Because the heated medium (molten salt) is only heated while flowing within the spiral metal pipe, the molten salt has a high flow rate, short heating time, and low thermal inertia, making temperature control of the molten salt energy storage system difficult; this problem becomes more pronounced with higher heater power.
[0004] Measuring the heating efficiency and obtaining the temperature response characteristics of a high-power electromagnetic induction heating molten salt energy storage system is crucial for evaluating and optimizing the efficiency of high-power electromagnetic induction heaters and the temperature control performance of the molten salt energy storage system. Utility Model Content
[0005] The purpose of this invention is to propose a high-power electromagnetic induction heating molten salt energy storage test platform for testing the heating efficiency and temperature response characteristics of a high-power electromagnetic induction heating molten salt energy storage system, so as to solve the aforementioned technical problems.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: A high-power electromagnetic induction heating molten salt energy storage test platform includes a three-phase power supply from the grid, a molten salt metal pipe, an electrical switch, a three-phase voltage regulator, a three-phase voltage transformer, a three-phase current transformer, a molten salt electromagnetic heating primary coil, a control and data processing system, and a molten salt electromagnetic heating spiral metal pipe. The electrical switch is located between the three-phase power supply from the grid and the three-phase voltage regulator. The three-phase voltage transformer and the three-phase current transformer are sequentially installed on the three-phase incoming lines after the three-phase voltage regulator. The molten salt electromagnetic heating primary coil is connected after the three-phase voltage transformer and the three-phase current transformer. The left end of the molten salt metal pipe is the low-temperature molten salt metal pipe inlet, and the right end is the high-temperature molten salt metal pipe outlet. A one-way valve and an electric valve are installed near the low-temperature molten salt metal pipe inlet, and a molten salt electromagnetic heating spiral metal pipe is installed near the high-temperature molten salt metal pipe outlet. The molten salt electromagnetic heating spiral metal pipe is the molten salt electromagnetic heating secondary coil. Electrical switches, three-phase voltage regulators, three-phase voltage transformers, three-phase current transformers, and electric valves are all connected to the control and data processing system.
[0007] Furthermore, the left side of the molten salt electromagnetic heating spiral metal pipe is equipped with an inlet temperature measuring device, an inlet pressure measuring device, and an inlet flow signal transmitter connected to the control and data processing system.
[0008] Furthermore, the right side of the molten salt electromagnetic heating spiral metal pipe is equipped with an output temperature measuring device connected to the control and data processing system.
[0009] Furthermore, the control and data processing system includes a programmable logic controller, a multi-channel data acquisition board, an industrial control computer with multiple interfaces, and a touch screen. The control signals of the electrical switches, three-phase voltage regulators, and electric valves are connected to the programmable logic controller.
[0010] The beneficial effects of this utility model are as follows: The high-power molten salt energy storage test platform provided by this utility model can be used in molten salt energy storage system laboratories (manufacturing plants) as well as in actual user sites, providing a reference for energy efficiency assessment and optimization of system structure and parameters for the development and application of high-power electromagnetic induction heating molten salt energy storage systems. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the high-power molten salt energy storage test platform system of this utility model.
[0012] In the diagram, 1-electric switch, 2-three-phase voltage regulator, 3-three-phase voltage transformer, 4-three-phase current transformer, 5-molten salt electromagnetic heating primary coil, 6-control and data processing system, 7-low temperature molten salt metal pipe inlet, 8-one-way valve, 9-electric valve, 10-inlet temperature measuring device, 11-inlet pressure measuring device, 12-flow signal transmitter, 13-molten salt flow measuring device, 14-molten salt electromagnetic heating spiral metal pipe, 15-outlet temperature measuring device, 16-high temperature molten salt metal pipe outlet. Detailed Implementation
[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the preferred embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention.
[0014] like Figure 1 As shown, this utility model discloses a high-power electromagnetic induction heating molten salt energy storage test platform. The three-phase power supply from the grid is connected to the three-phase voltage regulating device 2 of the electromagnetic induction heating molten salt via an electrical switch 1. The three-phase voltage regulating device 2 is used to regulate the power of the electromagnetic induction heater. The electromagnetic induction heating electrical system is equipped with a three-phase voltage transformer 3 and a three-phase current transformer 4 for measuring the electrical parameters (such as power) of the electromagnetic induction heating system. The three-phase power supply from the grid, after passing through the electrical switch 1, the three-phase voltage regulating device 2, and the monitoring and measuring three-phase voltage transformer 3 and three-phase current transformer 4, supplies power to the primary coil 5 (winding) of the molten salt electromagnetic heating system. The information and signals from the electrical switch 1, the three-phase voltage regulating device 2, the three-phase voltage transformer 3, and the three-phase current transformer 4 are connected to a control and data processing system 6. In addition to system control and monitoring functions, the control and data processing system 6 also includes signal conditioning, data acquisition, data processing, calculation, recording, storage, and display functions.
[0015] Flowing cryogenic molten salt enters the test platform system through the cryogenic molten salt metal pipe inlet 7. A one-way valve 8 and an electric valve 9 are sequentially installed on the metal pipe. The electric valve 9 is used to regulate and control the flow rate of the molten salt. To the right of the electric valve 9 (in the direction of molten salt flow), a cryogenic molten salt metal pipe inlet temperature measuring device 10 and a molten salt metal pipe inlet pressure measuring device 11 are installed to measure the temperature and pressure of the molten salt inside the metal pipe. A molten salt flow measuring device 13 is installed at the front end of the molten salt entering the molten salt electromagnetic heating spiral metal pipe 14, i.e., the secondary coil / winding. The signal reflecting the flow rate from the molten salt flow measuring device 13 is input to the flow signal transmitter 12 and converted into a standard transmission signal. The cryogenic molten salt flows through... The molten salt enters the electromagnetically heated spiral metal pipe 14 through the low-temperature molten salt inlet 7, check valve 8, electric valve 9, and molten salt flow measuring device 13, where it is heated. The heated molten salt is then output through the high-temperature molten salt outlet 16, where a high-temperature molten salt outlet temperature measuring device 15 measures the temperature of the heated molten salt. The information and signals from the electric valve 9, the low-temperature molten salt inlet temperature measuring device 10, the molten salt inlet pressure measuring device 11, the flow signal transmitter 12, and the high-temperature molten salt outlet temperature measuring device 15 are connected to the control and data processing system 6.
[0016] The control and data processing system 6 obtains three-phase voltage and current data through the three-phase voltage transformer 3 and the three-phase current transformer 4, thereby obtaining the main electrical parameters of the molten salt electromagnetic heating system, such as active power, reactive power, power factor and energy consumption, and thus providing a reference for evaluating and optimizing the electrical performance of the molten salt electromagnetic heating system.
[0017] The control and data processing system 6 obtains temperature and flow data through the low-temperature molten salt metal pipeline inlet temperature measuring device 10, the flow signal transmitter 12, and the high-temperature molten salt metal pipeline outlet temperature measuring device 15. This allows the system to obtain the energy (heat) increment of the molten salt electromagnetic heating system. Combined with the power consumption, the heating efficiency of the molten salt energy storage system, i.e., the electrothermal conversion efficiency, can be obtained, providing a reference for evaluating and optimizing the performance of the molten salt energy storage system.
[0018] The control and data processing system 6 consists of a programmable logic controller (PLC), a multi-channel data acquisition board, an industrial control computer (ICC) with various interfaces, and a touch screen. The PLC, multi-channel data acquisition board, and touch screen are connected to the ICC. The multi-channel data acquisition board can also be connected to the ICC through the PLC. The ICC contains various digital and analog interfaces, facilitating connection with digital and analog signals from sensors and control devices in the system.
[0019] The control signals of electrical switch 1, three-phase voltage regulator 2, and electric valve 9 are connected to the programmable logic controller (PLC). According to the requirements of the control and data processing system 6, the analog signals output by the three-phase voltage transformer 3, three-phase current transformer 4, input temperature measuring device 10, input pressure measuring device 11, flow signal transmitter 12, and output temperature measuring device 15 can be connected to the analog interface of the PLC or the analog interface of the industrial control computer. According to the requirements of the control and data processing system 8, the digital signals output by the three-phase voltage transformer 3, three-phase current transformer 4, input temperature measuring device 10, input pressure measuring device 11, flow signal transmitter 12, and output temperature measuring device 15 can be connected to the digital interface of the multi-channel data acquisition board and the PLC, or the digital interface of the industrial control computer. The molten salt flow measuring device 13 is connected to the flow signal transmitter 12.
[0020] While keeping the molten salt flow rate constant, the voltage of the primary coil 5 of the molten salt electromagnetic heating can be adjusted by the three-phase voltage regulating device 2, thereby adjusting the input power of the molten salt electromagnetic heating spiral metal pipe 14. This allows for the acquisition of the voltage (or power) of the primary coil 5 of the molten salt electromagnetic heating and the temperature response characteristics (such as heating inertia time constant) of the high-temperature molten salt metal pipe output port 16, providing a reference for the design and optimization of control parameters of the molten salt energy storage system.
[0021] While keeping the voltage of the primary coil 5 of the molten salt electromagnetic heating constant, the flow rate of the molten salt electromagnetic heating spiral metal pipe 14 can be adjusted by regulating the electric valve 9. This allows us to obtain the flow rate of the molten salt electromagnetic heating spiral metal pipe 14 and the temperature response characteristics (such as inertial time constant) of the high-temperature molten salt metal pipe outlet 16, providing a reference for the design and optimization of control parameters of the molten salt energy storage system.
Claims
1. A high-power electromagnetic induction heating molten salt energy storage test platform, characterized in that: The system includes a three-phase power supply from the power grid, a molten salt metal pipe, an electrical switch (1), a three-phase voltage regulator (2), a three-phase voltage transformer (3), a three-phase current transformer (4), a molten salt electromagnetic heating primary coil (5), a control and data processing system (6), and a molten salt electromagnetic heating spiral metal pipe (14). The electrical switch (1) is located between the three-phase power supply from the power grid and the three-phase voltage regulator (2). The three-phase voltage transformer (3) and the three-phase current transformer (4) are installed sequentially on the three-phase incoming lines after the three-phase voltage regulator (2). The molten salt electromagnetic heating primary coil (5) is connected after the three-phase voltage transformer (3) and the three-phase current transformer (4). The left end of the molten salt metal pipe is the low-temperature molten salt metal pipe inlet (7), and the right end is the high-temperature molten salt metal pipe outlet (16). A one-way valve (8) and an electric valve (9) are provided near the low-temperature molten salt metal pipe inlet (7). A molten salt electromagnetic heating spiral metal pipe (14) is located near the high-temperature molten salt metal pipe outlet (16). The molten salt electromagnetic heating spiral metal pipe (14) is the molten salt electromagnetic heating secondary coil. The electrical switch (1), three-phase voltage regulator (2), three-phase voltage transformer (3), three-phase current transformer (4) and electric valve (9) are all connected to the control and data processing system (6).
2. The high-power electromagnetic induction heating molten salt energy storage test platform according to claim 1, characterized in that: The molten salt electromagnetic heating spiral metal pipe (14) is equipped with an inlet temperature measuring device (10), an inlet pressure measuring device (11), and an inlet flow signal transmitter (12) connected to the control and data processing system (6).
3. The high-power electromagnetic induction heating molten salt energy storage test platform according to claim 2, characterized in that: The right side of the molten salt electromagnetic heating spiral metal pipe (14) is equipped with an output port temperature measuring device (15) connected to the control and data processing system (6).
4. The high-power electromagnetic induction heating molten salt energy storage test platform according to claim 3, characterized in that: The control and data processing system (6) includes a programmable logic controller, a multi-channel data acquisition board, an industrial control computer with multiple interfaces, and a touch screen. The control signals of the electrical switch (1), the three-phase voltage regulator (2), and the electric valve (9) are connected to the programmable logic controller.