Electromagnetic fused salt heating device and power adjusting method thereof

Abstract

The invention provides an electromagnetic fused salt heating device and a power adjusting method thereof.The electromagnetic fused salt heating device comprises a first electromagnetic coil and a second electromagnetic coil which are formed by bending a fused salt pipeline, the first electromagnetic coil and the second electromagnetic coil are connected to form an electromagnetic heating unit, the first electromagnetic coil is coupled with the first coil, and the second electromagnetic coil is coupled with the second coil; the second electromagnetic coil is coupled with the second coil, the second coil and the heating power adjusting unit are connected in series in the same loop, the fused salt pipeline further penetrates through the heating power adjusting unit, fused salt flowing through the fused salt pipeline is heated through the heating power adjusting unit and the electromagnetic heating unit, the total resistance value of the heating power adjusting unit is adjusted, and working parameters of the second electromagnetic coil are changed. Therefore, the heating power of the electromagnetic fused salt heating device is changed. The heating device is composed of the electromagnetic heating unit and the heating power adjusting unit, the resistance value of the heating power adjusting unit is adjusted, the working parameters of the electromagnetic heating unit are controlled, the heating power of the electromagnetic heating device is adjusted at low power, and the adjusting mode is simple.

Description

Technical Field

[0001] The present invention relates to the field of molten salt energy storage, and particularly to an electromagnetic molten salt heating device and its power regulation method. Background Art

[0002] In the field of new energy power generation, power generation systems dominated by photovoltaic and wind power have become important basic power generation equipment for power infrastructure. However, such power generation methods are restricted by multiple factors such as light, meteorological conditions, seasonal changes, and geographical environment, and there are situations such as unstable power generation and power interruption during power generation; in order to ensure the continuity and stability of the power supply of new energy generators, a corresponding energy storage regulation system needs to be configured.

[0003] Molten salt thermal energy storage systems have outstanding advantages in terms of heat storage capacity, large-scale construction, operating costs, service life, safety, and power generation power, and play an important role in building a new power system with new energy as the main body and ensuring the safe and stable operation of the power system. They are the backbone of large-scale energy storage. For example, in new energy (wind power, photovoltaic, etc.) generators with power interruption and poor stability.

[0004] In related technologies, after the metal pipes in the molten salt thermal energy storage system are wound, the equivalent impedance of the pipes is a fixed value and cannot be adjusted arbitrarily. If the power of the molten salt thermal energy storage system needs to be adjusted, the power regulation can only be achieved by the effective value of the voltage and the frequency of the input power supply at the front end of the heater. Currently, the molten salt heating system directly heats based on the high voltage of the input power supply (above 10 kV). By adjusting the input power supply, changing the power of the molten salt thermal energy storage system not only has high costs and complex adjustment methods, but also frequently adjusting the effective value of the output voltage and the frequency of the input power supply will reduce the reliability, service life, and stability of the components inside the input power supply.

[0005] Therefore, how to provide a device that can replace the input power supply to adjust the power of the molten salt heating system is an urgent problem to be solved currently. Summary of the Invention

[0006] In view of the above-mentioned disadvantages of the prior art, the present invention provides an electromagnetic molten salt heating device to solve at least one of the above technical problems.

[0007] To achieve the above object and other related objects, the technical solutions provided in this application are as follows.

[0008] According to the first aspect of the embodiments of the present application, an electromagnetic molten salt heating device is provided. The electromagnetic molten salt heating device includes a first electromagnetic coil and a second electromagnetic coil formed by bending a molten salt pipeline. The first electromagnetic coil and the second electromagnetic coil are connected to form an electromagnetic heating unit. The first electromagnetic coil is coupled to a first coil, and the second electromagnetic coil is coupled to a second coil connected in series with a heating power regulation unit. The molten salt pipeline also passes through the heating power regulation unit, and the molten salt flowing through the molten salt pipeline is heated by the heating power regulation unit and the electromagnetic heating unit. By adjusting the total resistance value of the heating power regulation unit, the operating parameters of the second electromagnetic coil are controlled, thereby adjusting the heating power of the electromagnetic molten salt heating device.

[0009] In an embodiment of the present invention, the molten salt sequentially flows through the heating power regulation unit and the electromagnetic heating unit. The molten salt input end of the electromagnetic heating unit is connected to the molten salt output end of the corresponding molten salt pipeline of the heating power regulation unit through the molten salt pipeline.

[0010] In an embodiment of the present invention, the molten salt input end and the molten salt output end of the electromagnetic heating unit are connected to a grounding block.

[0011] In an embodiment of the present invention, a microporous heat insulating board and a nano-aerogel felt are sequentially arranged on the molten salt pipeline.

[0012] In an embodiment of the present invention, both ends of the first coil are connected to a high-voltage power grid, and the first coil and the first electromagnetic coil are wound around a first magnetic core.

[0013] In an embodiment of the present invention, the first end of the second coil is connected to the first end of the heating power regulation unit, the second end of the second coil is connected to the second end of the heating power regulation unit, and the second coil and the second electromagnetic coil are wound around a second magnetic core.

[0014] In an embodiment of the present invention, the heating power regulation unit includes N series-connected power regulation sub-units. The power regulation sub-unit includes a first resistor, a second resistor, a first switch, and a second switch. The first end of the first resistor is connected to the first end of the second resistor, the second end of the first resistor is connected to the first end of the first switch, the second end of the first switch is connected to the second end of the second resistor, the first end of the second switch is connected to the first end of the second resistor, and the second end of the second switch is connected to the second end of the second resistor. Wherein, N is a positive integer and N≥2.

[0015] According to the second aspect of the embodiments of the present application, a power regulation method applied to the electromagnetic molten salt heating device described above is provided, including:

[0016] Obtain the target heating power required for the molten salt to be heated;

[0017] Adjust the total resistance value of the heating power adjustment unit to control the operating parameters of the electromagnetic heating unit, so as to adjust the heating power of the electromagnetic molten salt heating device to the target heating power.

[0018] In another embodiment of the present invention, adjusting the total resistance value of the heating power adjustment unit to control the operating parameters of the electromagnetic heating unit includes: according to the target heating power and the preset resistance-power mapping relationship, adjusting the total resistance value of the heating power adjustment unit to the target resistance value; determining the heating power of the heating power adjustment unit based on the target resistance value to adjust the heating power of the electromagnetic heating unit; wherein, the resistance-power mapping relationship is the relationship between the resistance value of the heating power adjustment unit and the output power of each unit in the electromagnetic molten salt heating device.

[0019] In another embodiment of the present invention, the establishing method of the resistance-power mapping relationship includes: taking the rated maximum resistance value of the heating power adjustment unit as the initial reference, sequentially decreasing the working resistance value, and synchronously collecting the heating power of each unit of the electromagnetic molten salt heating device at each resistance value node to generate the resistance-power mapping relationship; or, taking the rated minimum resistance value of the heating power adjustment unit as the initial reference, sequentially increasing the working resistance value, and synchronously collecting the heating power of each unit of the electromagnetic molten salt heating device at each resistance value node to generate the resistance-power mapping relationship.

[0020] The present application provides an electromagnetic molten salt heating device and its power adjustment method. The electromagnetic molten salt heating device includes a first electromagnetic coil and a second electromagnetic coil formed by bending a molten salt pipeline. The first electromagnetic coil and the second electromagnetic coil are connected to form an electromagnetic heating unit. The first electromagnetic coil is coupled with a first coil, the second electromagnetic coil is coupled with a second coil, and the second coil is connected in series with the heating power adjustment unit in the same circuit. The molten salt pipeline also passes through the heating power adjustment unit to heat the molten salt flowing through the molten salt pipeline through the heating power adjustment unit and the electromagnetic heating unit. Adjust the total resistance value of the heating power adjustment unit to control the operating parameters of the second electromagnetic coil, so as to adjust the heating power of the electromagnetic molten salt heating device. The electromagnetic molten salt heating device provided by the present application is composed of an electromagnetic heating unit and a heating power adjustment unit. The molten salt flowing through the molten salt pipeline is heated by the electromagnetic heating unit and the heating power adjustment unit. The total resistance value connected in series with the heating power adjustment unit is adjusted to change the operating parameters of the second electromagnetic coil, so as to realize the control of the output heating power of the molten salt heating device. The input power is coupled into the molten salt pipeline to realize the pipeline temperature rise, so as to achieve the purpose of heating the molten salt. The losses of the circuit and the contactor are much smaller than the losses of adjusting the frequency and effective value of the input power supply, which improves the working efficiency of the electromagnetic molten salt heating device.

[0021] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings:

[0023] Figure 1 is a schematic diagram of an electromagnetic molten salt heating device shown in an exemplary embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of molten salt flowing through a heating power regulation unit and an electromagnetic heating unit shown in an exemplary embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of the specific circuit structure of a heating power regulation unit shown in an exemplary embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of the curve between the working resistance value and the heating power of a heating power regulation unit shown in an exemplary embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for explaining the present invention and not for limiting the protection scope of the present invention.

[0028] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0029] In the following description, numerous details are explored to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0030] In the field of new energy power generation, power generation systems dominated by photovoltaic and wind power have become important basic power generation facilities for power infrastructure. However, such power generation methods are restricted by multiple factors such as light, meteorological conditions, seasonal changes, and geographical environment, and there are situations such as unstable power generation and power interruption during power generation; to ensure the continuity and stability of the power supply of new energy generators, a corresponding energy storage and regulation system needs to be configured.

[0031] The molten salt thermal energy storage system has outstanding advantages in terms of heat storage capacity, large-scale construction, operating cost, service life, safety, and power generation power, and plays an important role in building a new power system with new energy as the main body and ensuring the safe and stable operation of the power system. It is the backbone of large-scale energy storage. For example, in new energy (wind power, photovoltaic, etc.) generators with power interruption and poor stability.

[0032] Currently, more and more new energy power stations under construction or already built use "photovoltaic + molten salt electric heater" to achieve energy storage, and the market demand for molten salt heaters is increasing year by year. Electromagnetic molten salt heaters are gradually increasing their market share due to advantages such as high reliability, long life, and small maintenance volume; while the existing high-voltage electromagnetic molten salt heating relies on the input power supply for power regulation. Its principle is to change the strength of the magnetic field generated by the electromagnetic molten salt heating coil by adjusting the effective value of the supply voltage and frequency of the input power supply, thereby changing the heating power of the molten salt heater.

[0033] In the related art, after the metal pipes in the molten salt thermal energy storage system are wound, the equivalent impedance of the pipes is a fixed value and cannot be adjusted according to actual needs. If the output power of the molten salt thermal energy storage system needs to be adjusted, the power can only be adjusted by the effective value of the voltage and frequency of the input power supply at the front end of the heater. Currently, the molten salt heating system directly heats based on the high voltage of the input power supply (above 10 kV). By adjusting the input power supply, changing the power of the molten salt thermal energy storage system not only has a high cost and a complex adjustment method, but also frequently adjusting the effective value of the output voltage and frequency of the input power supply will reduce the reliability, life, and stability of the components inside the input power supply.

[0034] To solve the above problems, as Figure 1As shown in the figure, the present application provides an electromagnetic molten salt heating device. The electromagnetic molten salt heating device includes a first electromagnetic coil 120 and a second electromagnetic coil 130 formed by bending a molten salt pipeline 110. The first electromagnetic coil 120 and the second electromagnetic coil 130 are connected to form an electromagnetic heating unit 140. The first electromagnetic coil 120 is coupled with a first coil 150, and the second electromagnetic coil 130 is coupled with a second coil 170 connected in series with a heating power regulation unit 160. The molten salt pipeline 110 also passes through the heating power regulation unit 160. The molten salt flowing through the molten salt pipeline 110 is heated by the heating power regulation unit 160 and the electromagnetic heating unit 140. By adjusting the total resistance value of the heating power regulation unit 160, the working parameters of the second electromagnetic coil 130 are controlled, so as to adjust the heating power of the electromagnetic molten salt heating device.

[0035] Specifically, as Figure 2 shown in the figure, the molten salt flows through the heating power regulation unit 160 and the electromagnetic heating unit 140 in sequence. The molten salt input end of the electromagnetic heating unit 140 is connected to the molten salt output end of the corresponding molten salt pipeline 110 of the heating power regulation unit 160 through the molten salt pipeline 110. Specifically, as Figure 2 shown in the figure, the molten salt flows into from one end of the heating power regulation unit 160 and flows out from the other end. A molten salt pipeline 110 is arranged between the molten salt input end of the electromagnetic heating unit 140 and the heating power regulation unit 160. The molten salt flows into the electromagnetic heating unit 140, sequentially flows through the second electromagnetic coil 130 and the first electromagnetic coil 120, and then flows out from the molten salt output end of the electromagnetic heating unit 140 to obtain molten salt at a target temperature.

[0036] Specifically, as Figure 2 shown in the figure, the molten salt input end and the molten salt output end of the electromagnetic heating unit 140 are connected to a grounding block, so that the molten salt pipeline 110 of the electromagnetic heating unit 140 forms an electrically closed loop. The grounding block is grounded to ensure that the pipeline at the short-circuit end is not charged.

[0037] Specifically, a microporous heat-insulating board and a nano-aerogel felt are sequentially arranged on the molten salt pipeline. Specifically, it is necessary to set heat-insulating materials on the molten salt pipeline 110, such as Figure 1 and Figure 2As shown, there are certain requirements for the installation positions of the first electromagnetic coil 120 and the second electromagnetic coil 130, and the thickness of the thermal insulation material is limited. The combination of a micro-porous insulation board and a nano-aerogel felt is selected for thermal insulation. When the temperature is below 800°C, the thermal conductivity of the micro-porous insulation board is 0.03 W / (m·K). However, the micro-porous insulation board is fragile, afraid of moisture, and has many construction splicing gaps. When the temperature is below 300°C, the thermal conductivity of the nano-aerogel felt is about 0.03 W / (m·K). When the temperature is higher than 300°C, the thermal insulation performance of the nano-aerogel felt drops sharply. Within 300°C, it has good flexibility and excellent hydrophobic and waterproof properties. Therefore, two layers of 10-mm micro-porous insulation boards are arranged at the position close to the molten salt pipeline 110, and then wrapped with a nano-aerogel felt outside the micro-porous insulation board. The molten salt pipeline 110 at about 600°C passes through 40-mm thermal insulation material, reducing the surface temperature of the molten salt pipeline 110 to about 70°C.

[0038] More specifically, as Figure 2 shown, both ends of the first coil 150 are connected to the high-voltage power grid, and the first coil 150 and the first electromagnetic coil 120 are arranged around the first magnetic core 180.

[0039] More specifically, as Figure 2 shown, the first end of the second coil 170 is connected to the first end of the heating power regulation unit 160, the second end of the second coil 170 is connected to the second end of the heating power regulation unit 160, and the second coil 170 and the second electromagnetic coil 130 are arranged around the second magnetic core 190.

[0040] Specifically, the heating power regulation unit 160 includes N series-connected power regulation sub-units. The power regulation sub-unit includes a first resistor R1i, a second resistor R2i, a first switch S1i, and a second switch S2i. The first end of the first resistor R1i is connected to the first end of the second resistor R2i, the second end of the first resistor R1i is connected to the first end of the first switch S1i, the second end of the first switch S1i is connected to the second end of the second resistor R2i, the first end of the second switch S2i is connected to the first end of the second resistor R2i, and the second end of the second switch S2i is connected to the second end of the second resistor R2i. Among them, N and i are positive integers, 1 ≤ i ≤ N, and N ≥ 2.

[0041] Specifically, as Figure 3 shown, the first power regulation sub-unit 331 includes a first resistor R11, a second resistor R21, a first switch S11, and a second switch S21. The first end of the first resistor R11 is connected to the first end of the second resistor R21, the second end of the first resistor R11 is connected to the first end of the first switch S11, the second end of the first switch S11 is connected to the second end of the second resistor R21, the first end of the second switch S21 is connected to the first end of the second resistor R21, and the second end of the second switch S21 is connected to the second end of the second resistor R21.

[0042] Specifically, as Figure 3 shown, the second power regulation sub-unit 332 includes a first resistor R12, a second resistor R22, a first switch S12 and a second switch S22. The first end of the first resistor R12 is connected to the first end of the second resistor R22. The second end of the first resistor R12 is connected to the first end of the first switch S12. The second end of the first switch S12 is connected to the second end of the second resistor R22. The first end of the second switch S22 is connected to the first end of the second resistor R22. The second end of the second switch S22 is connected to the second end of the second resistor R22.

[0043] It should be noted that the first end of the second resistor R21 in the first power regulation sub-unit 331 is the first end of the heating power regulation unit 160. The second end of the second resistor R2N in the Nth power regulation sub-unit 33N is the second end of the heating power regulation unit 160. The second end of the ith second resistor R2i is connected to the first end of the (i + 1)th second resistor R2(i + 1).

[0044] As Figures 1 to 4 shown, the working principle of the electromagnetic molten salt heating device provided in this application is as follows:

[0045] As Figure 1 shown, the electromagnetic molten salt heating device is composed of an electromagnetic heating unit 140 and a heating power regulation unit 160. The electromagnetic heating unit 140 includes a first electromagnetic coil 120 and a second electromagnetic coil 130 formed by bending a molten salt pipe 110. During the working process of the electromagnetic molten salt heating device, as Figure 2 shown, the molten salt first flows into the heating power regulation unit 160. After the temperature of the molten salt is raised to a preset temperature, it then flows into the electromagnetic heating unit 140. The molten salt is heated by the first electromagnetic coil 120 and the second electromagnetic coil 130, so that the molten salt at the molten salt output end of the electromagnetic heating unit 140 reaches the target temperature (generally 550 °C to 565 °C).

[0046] It should be emphasized that the heating method of the electromagnetic heating unit 140 is through the electromagnetic induction of the first electromagnetic coil 120 and the second electromagnetic coil 130, so that it generates heat by itself and exchanges heat with the molten salt flowing through the molten salt pipe 110 to raise the temperature of the molten salt. The heating method of the heating power regulation unit 160 is to use a conventional low-voltage armored electric heating tube immersed in the molten salt to heat the molten salt. Comparing the two heating methods: the heating power regulation unit 160 has a low heating and heat exchange efficiency, and a large temperature difference between the heating element and the molten salt is required to improve the heating capacity; the electromagnetic heating unit 140 has a high heat exchange efficiency, a small temperature difference between the molten salt and the pipe wall, and a high heating efficiency. Therefore, the molten salt should be heated by the heating power regulation unit 160 first and then by the electromagnetic heating unit 140.

[0047] When the high-voltage power grid inputs into the first coil 150, due to electromagnetic coupling, an induced electromotive force will be generated in the first electromagnetic coil 120. At this time, the second electromagnetic coil 130 is equivalent to a series load. When there is current flowing through the second electromagnetic coil 130, electromagnetic coupling occurs between the second electromagnetic coil 130 and the second coil 170, and electromotive forces are generated at both ends of the second coil 170. By adjusting the closing conditions of the switches in the N power regulation sub-units, the total resistance value in the heating power regulation unit 160 is changed between the rated maximum value and the rated minimum value, thereby changing the impedance of the second electromagnetic coil 130, and further controlling the heating power regulation of the electromagnetic molten salt heating device.

[0048] As Figure 3 shown, if the heating power of the electromagnetic heating device is adjusted from small to large, as Figure 4 shown, first set the total resistance value of the heating power regulation unit 160 to the rated maximum value of 100,000, and then sequentially close the first switches S11, S12,..., S1N in the heating power regulation unit 160, and keep the second switches S21, S22,..., S2N open. During this process, the total resistance value of the heating power regulation unit gradually decreases. When all the first switches S11, S12,..., S1N are closed, the first resistor R1i and the second resistor R2i in each power regulation sub-unit 33i are both in the working state, as Figure 4 shown. At this time, the heating power of the heating power regulation unit 160 is the maximum value, and at this time, the heat exchange area of the heating power regulation unit 160 is the largest. After the power of the heating power regulation unit 160 passes the maximum value, it starts to slowly decrease. Keep the first switches S11, S12,..., S1N closed, and sequentially close the second switches S21, S22,..., S2N to short-circuit the heating power regulation unit 160 through the second switches S21, S22,..., S2N. During this process, the heating power of the electromagnetic heating unit 140 keeps rising. When the resistance value of the heating power regulation unit 160 is the smallest (0.1), the heating power of the electromagnetic molten salt heating device is equal to the heating power of the electromagnetic heating unit 140.

[0049] In the second aspect of the present application, the present application also provides a power regulation method applied to the electromagnetic molten salt heating device described above. The method includes:

[0050] Obtain the target heating power required for the molten salt to be heated;

[0051] Adjust the total resistance value of the heating power regulation unit, and control the working parameters of the electromagnetic heating unit to adjust the heating power of the electromagnetic molten salt heating device to the target heating power.

[0052] Specifically, if the heating power required for the molten salt to be heated is only a preset rated ratio of the input from the high-voltage power grid, adjust the number of working resistors in the heating power regulation unit, adjust the total resistance value of the heating power regulation unit, and control the working parameters of the electromagnetic heating unit, so as to adjust the heating power of the electromagnetic molten salt heating device to the target heating power, and achieve the adjustment of the heating power of the electromagnetic molten salt heating device according to actual requirements.

[0053] In detail, adjusting the total resistance value of the heating power regulation unit and controlling the working parameters of the electromagnetic heating unit include: according to the target heating power and the preset resistance-power mapping relationship, adjusting the total resistance value of the heating power regulation unit to the target resistance value; determining the heating power of the heating power regulation unit based on the target resistance value to adjust the heating power of the electromagnetic heating unit; wherein, the resistance-power mapping relationship is the relationship between the resistance value of the heating power regulation unit and the output power of each unit in the electromagnetic molten salt heating device. Specifically, when querying the target resistance value of the heating power regulation unit according to the preset resistance-power mapping relationship for the required power being the target heating power, then controlling the closing of the switches in the heating power regulation unit according to the target resistance value, so that the total resistance value output by the heating power regulation unit is the target resistance value, determining the heating power output by the heating power regulation unit according to the target resistance value, and adjusting the heating power of the electromagnetic heating unit.

[0054] More specifically, the establishment methods of the resistance-power mapping relationship include the following two methods: First, taking the rated maximum resistance value of the heating power regulation unit as the initial reference resistance value, successively closing multiple first switches S11, S12, ……, S1N and second switches S21, S22, ……, S2N in the heating power regulation unit, so as to successively decrease the working resistance value of the heating power regulation unit. At the same time, obtain the heating powers of the electromagnetic heating unit and the heating power regulation unit, as well as the heating power of the electromagnetic molten salt heating device at each different resistance value node, and generate the resistance-power mapping relationship according to the decreasing change law of the total resistance value of the heating power regulation unit, the heating powers of the electromagnetic heating unit and the heating power regulation unit, and the heating power of the electromagnetic molten salt heating device. Second, taking the rated minimum resistance value of the heating power regulation unit as the initial reference resistance value, successively disconnecting multiple second switches S21, S22, ……, S2N and multiple first switches S11, S12, ……, S1N in the heating power regulation unit, so as to successively increase the working resistance value of the heating power regulation unit. At the same time, obtain the heating powers of the electromagnetic heating unit and the heating power regulation unit, as well as the heating power of the electromagnetic molten salt heating device at each different resistance value node, and generate the resistance-power mapping relationship according to the increasing change law of the total resistance value of the heating power regulation unit, the heating powers of the electromagnetic heating unit and the heating power regulation unit, and the heating power of the electromagnetic molten salt heating device.

[0055] The present application provides an electromagnetic molten salt heating device and a power regulation method therefor. In the electromagnetic molten salt heating device, a first electromagnetic coil and a second electromagnetic coil formed by bending a molten salt pipeline are included. The first electromagnetic coil and the second electromagnetic coil are connected to form an electromagnetic heating unit. The first electromagnetic coil is coupled to a first coil, and the second electromagnetic coil is coupled to a second coil. The second coil and a heating power regulation unit are connected in series in the same circuit. The molten salt pipeline also passes through the heating power regulation unit to heat the molten salt flowing through the molten salt pipeline through the heating power regulation unit and the electromagnetic heating unit. By adjusting the total resistance value of the heating power regulation unit, the operating parameters of the second electromagnetic coil are changed, so as to change the heating power of the electromagnetic molten salt heating device. The electromagnetic molten salt heating device provided by the present application adopts a structure of an electromagnetic heating unit and a heating power regulation unit composed of two-stage electromagnetic coils. By controlling the working resistance of the heating power regulation unit, the power adjustment of the entire electromagnetic heating device is realized; by controlling the closing of the switch in the heating power regulation unit and adjusting the resistance value of the heating power regulation unit in a series-parallel manner, the continuous power regulation of the electromagnetic molten salt heating device is realized. The adjustment method is simple and the cost is low; through the recycling of the regulated power by the heating power regulation unit and the combined design of setting multiple layers of thermal insulation materials, the heating efficiency of the heating device is improved.

[0056] The above embodiments are only used to exemplarily illustrate the principles and effects of the present invention, rather than to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An electromagnetic molten salt heating device, characterized in that, The electromagnetic molten salt heating device includes a first electromagnetic coil and a second electromagnetic coil formed by bending a molten salt pipeline. The first electromagnetic coil and the second electromagnetic coil are connected to form an electromagnetic heating unit. The first electromagnetic coil is coupled to a first coil, and the second electromagnetic coil is coupled to a second coil connected in series with a heating power regulation unit. The molten salt pipeline also passes through the heating power regulation unit, and the molten salt flowing through the molten salt pipeline in the heating power regulation unit and the electromagnetic heating unit is heated. The total resistance value of the heating power regulation unit is adjusted to control the working parameters of the second electromagnetic coil, thereby adjusting the heating power of the electromagnetic molten salt heating device.

2. The electromagnetic molten salt heating device according to claim 1, wherein The molten salt flows through the heating power regulation unit and the electromagnetic heating unit in sequence. The molten salt input end of the electromagnetic heating unit is connected to the molten salt output end of the corresponding molten salt pipeline of the heating power regulation unit through the molten salt pipeline.

3. The electromagnetic molten salt heating device according to claim 2, characterized in that, The molten salt input end and the molten salt output end of the electromagnetic heating unit are connected to a grounding block.

4. The electromagnetic molten salt heating device according to claim 1, characterized in that, A microporous heat insulation board and a nano-aerogel felt are sequentially arranged on the molten salt pipeline.

5. The electromagnetic molten salt heating device according to claim 1, characterized in that, Both ends of the first coil are connected to a high-voltage power grid, and the first coil and the first electromagnetic coil are arranged around a first magnetic core.

6. The electromagnetic molten salt heating device according to claim 1, wherein The first end of the second coil is connected to the first end of the heating power regulation unit, and the second end of the second coil is connected to the second end of the heating power regulation unit. The second coil and the second electromagnetic coil are arranged around a second magnetic core.

7. The electromagnetic molten salt heating device according to claim 1, characterized in that, The heating power regulation unit includes N series-connected power regulation sub-units. The power regulation sub-unit includes a first resistor, a second resistor, a first switch, and a second switch. The first end of the first resistor is connected to the first end of the second resistor, the second end of the first resistor is connected to the first end of the first switch, the second end of the first switch is connected to the second end of the second resistor, the first end of the second switch is connected to the first end of the second resistor, and the second end of the second switch is connected to the second end of the second resistor. Wherein, N is a positive integer and N≥2.

8. A power regulation method applied to the electromagnetic molten salt heating device according to any one of claims 1-7, characterized in that, Including: Obtain the target heating power required for the molten salt to be heated; Adjust the total resistance value of the heating power regulation unit and control the working parameters of the electromagnetic heating unit to adjust the heating power of the electromagnetic molten salt heating device to the target heating power.

9. The power regulation method of the electromagnetic molten salt heating device according to claim 8, characterized in that, Adjusting the total resistance value of the heating power regulation unit and controlling the working parameters of the electromagnetic heating unit includes: According to the target heating power and the preset resistance-power mapping relationship, adjust the total resistance value of the heating power regulation unit to the target resistance value; Determine the heating power of the heating power regulation unit based on the target resistance value to adjust the heating power of the electromagnetic heating unit; Wherein, the resistance-power mapping relationship is the relationship between the resistance value of the heating power regulation unit and the output power of each unit in the electromagnetic molten salt heating device.

10. The power regulation method of the electromagnetic molten salt heating device according to claim 9, characterized in that, The establishment method of the resistance-power mapping relationship includes: Taking the rated maximum resistance value of the heating power regulation unit as the initial reference, sequentially decreasing the working resistance value, and synchronously collecting the heating power of each unit of the electromagnetic molten salt heating device at each resistance value node to generate the resistance-power mapping relationship; or, Taking the rated minimum resistance value of the heating power regulation unit as the initial reference, sequentially increasing the working resistance value, and simultaneously collecting the heating power of each unit of the electromagnetic molten salt heating device at each resistance value node to generate the resistance-power mapping relationship.

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