A heat storage dual-media electromagnetic induction heating heater and its heating system

Abstract

The present invention relates to a heat storage type dual-media electromagnetic induction heating heater, wherein the electromagnetic induction heating heater (15) is a double-layer sleeve-shaped heater, which comprises, from the inside to the outside, an inner tube wall (2), an outer tube wall (4), an insulating material (5), an electromagnetic induction coil (6) and a plurality of magnetic conductors (7); wherein an inner flow channel (1) is formed on the inner side of the inner tube wall (2), and an outer flow channel (3) is formed between the inner tube wall (2) and the outer tube wall (4); the electromagnetic induction coil (6) simultaneously generates eddy currents in the inner tube wall (2) and the outer tube wall (4), thereby generating heat for heating the fluid in the inner flow channel (1) and the fluid in the outer flow channel (3); the fluid in the inner flow channel (1) is water; and the fluid in the outer flow channel (3) is heat transfer oil.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic induction heating, and in particular relates to a heat storage type dual-medium electromagnetic induction heating heater and a heating system thereof. Background Art

[0002] Electromagnetic induction heating is an environmentally friendly, energy-saving and highly efficient heating method. Its principle is to convert alternating current into an alternating magnetic field through an inductor coil, and then act on a metal workpiece in the electromagnetic field to generate eddy currents in the metal workpieces. The heat generated by the eddy currents heats the metal workpieces, causing the metal workpieces to heat up rapidly in a short period of time to achieve the heating purpose.

[0003] At present, the existing electromagnetic induction heating heater is a heating device that uses the principle of electromagnetic induction heating. Figure 1 As shown, it includes from the inside to the outside: a steel heating water pipe, an insulating material 5, a high-frequency induction coil 6 and a number of magnetic conductors 7. Its main working principle: an external drive control system provides a high-frequency alternating current of more than 20,000 Hz to the high-frequency induction coil 6 wound on the steel heating water pipe, and a high-frequency changing magnetic field is formed in the space in the middle of the high-frequency induction coil 6, and countless eddy currents are formed on the pipe wall 18 of the steel heating water pipe to generate heat, thereby quickly heating the heating circulating water in the pipeline. Due to the direct and rapid heating of the heating pipeline, the existing electromagnetic induction heating heater has the advantages of less heat dissipation, high heating efficiency, and convenient and rapid start and stop. However, the existing electromagnetic induction heating heater has the following defects:

[0004] 1) When circulating water flows in the steel heating water pipe, its temperature distribution is not uniform. Specifically, the fluid located outside the flow channel near the pipe wall 18 will be heated first, and the heat will gradually diffuse to the flow channel center 19 through convection heat transfer. When the temperature of the main water flow in the flow channel center 19 is still low and only slightly higher than the inlet temperature, the temperature of the fluid near the pipe wall 18 has risen sharply. For electromagnetic heating heaters with high power, the temperature of the fluid near the pipe wall 18 can even quickly reach the boiling point, forming water vapor bubbles or even air films on the pipe wall 18, causing the heat transfer coefficient to suddenly decrease, the heat transfer effect to deteriorate sharply, and the heat cannot be taken away by the fluid in time. While the temperature of the flow channel center 19 cannot be increased in time, the temperature of the pipe wall 18 rises rapidly, which can seriously cause the pipe wall 18 to be damaged by high temperature. The existing technical solution mainly monitors the temperature of the pipe wall 18 for over-temperature protection. When the temperature of the pipe wall 18 is close to the boiling point of water, the external drive control system will cut off the current of the high-frequency induction coil 6. This method can effectively prevent the vaporization of the pipe wall and protect the pipe wall material. However, for large-power units, since the rate at which the high-frequency electromagnetic induction coil 6 heats the pipe wall 18 is significantly faster than the rate at which heat is transferred from the fluid near the pipe wall to the center of the flow channel 19, when the temperature of the fluid near the pipe wall is close to the boiling point, the average outlet water temperature may still be very low. Therefore, a system with only over-temperature protection control will cause the electromagnetic induction heater to be forced to stop working frequently and for a long time when the average outlet temperature rises only slightly, resulting in the electromagnetic induction heating technology being unable to fully utilize its advantage of a high heating rate.

[0005] 2) Existing electromagnetic heating technologies are generally not equipped with high-energy-density heat storage systems, and are unable to take advantage of the difference in peak and valley electricity prices, work and store energy at night when electricity prices are cheap, and use the stored energy when electricity prices are high during the day to reduce the cost of electromagnetic heating. At present, the heat storage system configured for electromagnetic heating technology is usually a large water tank with low energy density, which has the problem of occupying too much space and being too large in size. Summary of the invention

[0006] The purpose of the present invention is to solve the above-mentioned defects of the existing electromagnetic induction heating heaters. The present invention provides a heat storage type dual-fluid electromagnetic induction heating heater. The heating heater is a double-layer sleeve-shaped heater, which includes, from the inside to the outside: an inner tube wall, an outer tube wall, an insulating material, an electromagnetic induction coil and a plurality of magnetic conductors; wherein, an inner layer flow channel is formed on the inner side of the inner tube wall, and an outer layer flow channel is formed between the inner tube wall and the outer tube wall. The electromagnetic induction coil simultaneously generates eddy currents in the inner tube wall and the outer tube wall, thereby generating heat for heating the fluid in the inner layer flow channel and the fluid in the outer layer flow channel; the fluid in the inner layer flow channel is water; the fluid in the outer layer flow channel is heat transfer oil.

[0007] In the above technical solution, the inner tube wall and the outer tube wall are both made of carbon steel or stainless steel with a temperature resistance of more than 400°C and have a high magnetic permeability for absorbing electromagnetic radiation and generating heat.

[0008] In the above technical solution, since the distance between the outer tube wall and the coil is closer than the distance between the inner tube wall and the coil, the magnetic field density in the outer flow channel is greater than the magnetic field density in the inner flow channel, resulting in the heating power in the outer flow channel being greater than the heating power in the inner flow channel.

[0009] In the above technical solution, the magnetic conductor is used to guide and concentrate the magnetic field.

[0010] Based on the above-mentioned heat storage dual-media electromagnetic induction heating heater, the present invention also provides a heating system, which includes: a heat transfer oil circulation subsystem and a water circulation subsystem; the inner flow channel is a circulating water flow channel; the outer flow channel is a circulating heat transfer oil flow channel; wherein the axial length and radial volume of the circulating water flow channel and the circulating heat transfer oil flow channel need to be set according to the size of the heating power.

[0011] The thermal oil circulation subsystem uses thermal oil as a heating medium and a heat storage medium to form a thermal oil circuit; the thermal oil circulation subsystem further includes: an electromagnetic induction heating heater, a vertical heat storage oil tank, an oil pump and a drive control unit; the electromagnetic induction heating heater, the vertical heat storage oil tank and the oil pump are connected in sequence to form a closed loop; the electromagnetic induction heating heater is also connected to the drive control unit.

[0012] The working process of the thermal oil circulation subsystem is divided into a heating stage, a heat storage stage, and a heat exchange stage; specifically,

[0013] In the heat transfer oil circuit circulation, when the drive control unit powers on the electromagnetic induction heating heater for heating, the heat transfer oil with a lower temperature at the bottom of the vertical heat storage oil tank will be pumped to the outer flow channel of the electromagnetic induction heating heater by the oil pump, and the heat transfer oil in the outer flow channel will be heated by the inner and outer tube walls at the same time. When the temperature of the heat transfer oil is higher than the temperature of the inner tube wall, the high-temperature heat transfer oil acts as a heating medium to transfer heat to the circulating water in the inner flow channel; then, the heat transfer oil enters the vertical heat storage tank from the upper part. When the temperature of the circulating water in the inner flow channel is heated to near the boiling point, the heating process ends. The heating process is precisely controlled by the drive control unit, and it is tried to ensure that it is only carried out at night when electricity is cheaper.

[0014] When storing heat, the heat transfer oil is stored in a vertical heat storage tank. By well insulating the vertical heat storage tank, the temperature drop per unit time is not obvious. Due to the high viscosity of the heat transfer oil, it will have a good natural stratification in the cylindrical heat storage tank, that is, the upper layer is hot oil and the lower layer is cold oil, which is conducive to maintaining a high oil temperature during heat exchange.

[0015] During heat exchange, the high-temperature heat transfer oil is pumped from the upper part of the vertical heat storage tank into the outer flow channel of the electromagnetic induction heating heater. The electromagnetic induction heating heater at this time acts as a shell-and-tube heat exchanger. The water to be heated enters the inner flow channel of the electromagnetic induction heating heater from the lower part and performs countercurrent heat exchange with the high-temperature heat transfer oil. Since the temperature of the heat transfer oil is much higher than the water temperature, sufficient water temperature can be guaranteed for heating. The cooled heat transfer oil returns to the vertical oil storage tank from the lower part of the vertical heat storage tank through the oil pump. When the temperature of the heat transfer oil in the vertical oil storage tank is lower than the heat exchange requirement, the drive control unit energizes the electromagnetic induction heating heater for heating.

[0016] The water circulation subsystem uses water as a circulating medium to form a water cycle; the water circulation subsystem further includes: an electromagnetic induction heating heater, a heating radiator, a drive control unit and a circulating water pump; the electromagnetic induction heating heater, the heating radiator and the circulating water pump are connected in sequence to form a closed loop.

[0017] Specifically, in the water circuit circulation, when the driving control unit energizes the electromagnetic induction heating heater for heating, the circulating water in the inner flow channel of the electromagnetic induction heating heater will be heated by the inner pipe wall, and its energy comes from the eddy current generated by the high-frequency alternating magnetic field on the inner pipe wall and the inward heat transfer of the high-temperature heat transfer oil in the outer flow channel. In the heat exchange stage, the heat only comes from the inward heat transfer of the high-temperature heat transfer oil in the outer flow channel. After being heated in the electromagnetic induction heating heater, the circulating water is driven by the circulating water pump, leaves the electromagnetic induction heater from the circulating water outlet, enters the heating radiator to dissipate heat to the indoor space of the building, and then flows back from the circulating water inlet to the inner flow channel of the electromagnetic induction heating heater to continue to be heated, forming a cycle.

[0018] The advantages of the present invention are:

[0019] Since the boiling point of heat transfer oil is generally above 300°C, which is much higher than the boiling point of water of 100°C; therefore, under the condition of unchanged heating power, the heating time in a single heating cycle can be extended without the problem of fluid vaporization. This reduces the number of times the over-temperature protection is activated per unit time and improves the average heating power of the electromagnetic heating system. In addition, since the diameter of the inner flow channel is small, the cross-section of the outer flow channel is annular, and the inner tube wall also heats the heat transfer oil, the heating area of ​​the inner and outer flow channels is relatively large, and the temperature distribution in the flow channel will be more uniform, avoiding the problem that the fluid temperature in the center flow channel is significantly lower than the fluid temperature near the tube wall in the large-diameter single-layer flow channel of the traditional electromagnetic heater, and realizing rapid overall uniform heating of all fluids, further improving the heating efficiency.

[0020] The introduction of vertical thermal oil storage tanks enables the system to have high-temperature heat storage function. Compared with water storage tanks, vertical thermal oil storage tanks can use less space and floor space to store more thermal energy. Taking full advantage of the fast heating rate of electromagnetic induction heating technology, heating consumes electricity when electricity rates are low, and using stored heat energy during periods of high electricity rates to reduce user costs. Vertical thermal oil storage tanks can serve as the receiving end of the power load response on the demand side, participate in grid peak regulation, increase access to new energy power, and provide users with the possibility of participating in power transactions in the form of variable loads in the power market. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an electromagnetic induction heating heater of the prior art;

[0022] Figure 2 It is a structural schematic diagram of a heat storage dual-media electromagnetic induction heating heater of the present invention;

[0023] Figure 3 This is a front view of a heat storage dual-media electromagnetic induction heating heater of the present invention;

[0024] Figure 4 It is a schematic diagram of a dual-fluid electromagnetic heating system of the present invention. Description of the drawings:

[0026] 1. Inner flow channel 2. Inner tube wall

[0027] 3. Outer flow channel 4. Outer tube wall

[0028] 5. Insulation material 6. Electromagnetic induction coil

[0029] 7. Magnetic conductor 8. First thermal oil port

[0030] 9. Second thermal oil port 10. Circulating water inlet

[0031] 11. Circulating water outlet 12. Drive control unit

[0032] 13. Vertical heat storage oil tank 14. Oil pump

[0033] 15. Electromagnetic induction heating heater 16. Heating radiator

[0034] 17. Circulating water pump 18. Pipe wall

[0035] 19. Center runner DETAILED DESCRIPTION

[0036] like Figure 2 and 3As shown, the present invention provides a heat storage type dual-fluid electromagnetic induction heating heater 15, which is a double-layer sleeve-shaped heater, which includes, from the inside to the outside, an inner tube wall 2, an outer tube wall 4, an insulating material 5, an electromagnetic induction coil 6 and a plurality of magnetic conductors 7; wherein, an inner layer flow channel 1 is formed on the inner side of the inner tube wall 2, and an outer layer flow channel 3 is formed between the inner tube wall 2 and the outer tube wall 4, and the electromagnetic induction coil 6 simultaneously generates eddy currents in the inner tube wall 2 and the outer tube wall 4, thereby generating heat for heating the fluid in the inner layer flow channel 1 and the fluid in the outer layer flow channel 3; the fluid in the inner layer flow channel 1 is water; the fluid in the outer layer flow channel 3 is heat transfer oil.

[0037] In the above technical solution, the inner tube wall 2 and the outer tube wall 4 are both made of high carbon steel or stainless steel with a temperature resistance of 400°C and have a high magnetic permeability for absorbing electromagnetic radiation and generating heat.

[0038] In the above technical solution, since the distance between the outer layer flow channel 3 and the electromagnetic induction coil 6 is closer than the distance between the inner layer pipe wall 3 and the coil, the magnetic field density in the outer layer flow channel 3 is greater than the magnetic field density in the inner layer flow channel 1, resulting in the heating power in the outer layer flow channel 3 being greater than the heating power in the inner layer flow channel 1.

[0039] In the above technical solution, the magnetic conductor 7 is used to guide and concentrate the magnetic field.

[0040] In the above technical solution, the insulating material 5 is preferably epoxy resin.

[0041] Based on the above-mentioned heat storage dual-media electromagnetic induction heating heater 15, as Figure 4 As shown, the present invention also provides a heating system, which includes: a heat transfer oil circulation subsystem and a water circulation subsystem; the inner flow channel 1 is a circulating water flow channel; the outer flow channel 3 is a circulating heat transfer oil flow channel; wherein the axial length and radial volume of the circulating water flow channel and the circulating heat transfer oil flow channel can be set according to the size of the heating power.

[0042] The thermal oil circulation subsystem uses thermal oil as a heating medium and a heat storage medium to form a thermal oil circuit; the thermal oil circulation subsystem further includes: an electromagnetic induction heating heater 15, a vertical thermal oil storage tank 13, an oil pump 14 and a drive control unit 12; the electromagnetic induction heating heater 15, the vertical thermal oil storage tank 13, and the oil pump 14 are sequentially connected to form a closed loop; the electromagnetic induction heating heater 15 is also connected to the drive control unit 12. The thermal oil heated by the electromagnetic induction heating heater 15 enters the vertical thermal oil storage tank 13 for storage, and when heat exchange is required, the thermal oil enters the outer flow channel 3 of the electromagnetic induction heating heater 15 to exchange heat with the circulating water of the inner flow channel 1.

[0043] The vertical heat storage oil tank 13 is a vertical cylindrical tank body, which is convenient for thermal stratification of the oil.

[0044] The working process of the thermal oil circulation subsystem is divided into a heating stage, a heat storage stage, and a heat exchange stage; specifically,

[0045] In the heat transfer oil circuit circulation, when the drive control unit 12 energizes the electromagnetic induction heating heater 15 for heating, the heat transfer oil at the lower part of the vertical heat storage oil tank 13 with a lower temperature will be transported by the oil pump 14 to the outer flow channel 3 of the electromagnetic induction heating heater 15, and the heat transfer oil in the outer flow channel 3 will be heated by the inner tube wall 2 and the outer tube wall 4 at the same time. When the temperature of the heat transfer oil is higher than the temperature of the inner tube wall 2, the high-temperature heat transfer oil, as a heating medium, transfers heat to the circulating water in the inner flow channel 1; after being circulated and heated to a temperature close to the boiling point of water, the heat transfer oil enters the vertical heat storage tank 13 from the upper part of the vertical heat storage tank 13, i.e., the second heat transfer oil port 9. The heating process is precisely controlled by the drive control unit 12, and it is ensured to be carried out only at night when the electricity rate is relatively cheap.

[0046] During heat storage, the heat transfer oil is stored in the vertical heat storage tank 13. By well insulating the vertical heat storage tank 13, the temperature drop per unit time is not obvious. Since the viscosity of the heat transfer oil is relatively high, it will be well naturally stratified in the cylindrical heat storage tank, that is, the upper layer is hot oil and the lower layer is cold oil, which is conducive to maintaining a high oil temperature during heat exchange.

[0047] During heat exchange, the high-temperature thermal oil is pumped into the outer flow channel 3 of the electromagnetic induction heating heater 15 from the second thermal oil port 9. The electromagnetic induction heating heater 15 is equivalent to a shell-and-tube heat exchanger. The water to be heated enters the inner flow channel 1 of the electromagnetic induction heating heater 15 from the lower circulating water inlet 10, and performs countercurrent heat exchange with the high-temperature thermal oil. Since the temperature of the thermal oil is much higher than the water temperature, sufficient water temperature can be guaranteed for heating. The cooled thermal oil returns to the vertical oil storage tank from the first thermal oil port 8 at the bottom of the vertical heat storage tank through the oil pump. When the temperature of the thermal oil in the vertical oil storage tank is lower than the heat exchange requirement, the drive control unit 12 powers on the electromagnetic induction heating heater 15 for heating.

[0048] The water circulation subsystem uses water as a circulating medium to form a water cycle; the water circulation subsystem further includes: a drive control unit 12, an electromagnetic induction heating heater 15, a heating radiator 16 and a circulating water pump 17; the electromagnetic induction heating heater 15, the heating radiator 16 and the circulating water pump 17 are connected in sequence to form a closed loop. Among them, the circulating water heated by the electromagnetic induction heating heater 15 enters the heating radiator 16, and after heat dissipation, it returns to the electromagnetic induction heating heater 15 to be heated by electromagnetic induction heating or thermal oil.

[0049] Specifically, in the water circulation, when the driving control unit 12 energizes the electromagnetic induction heating heater 15 for heating, the circulating water in the inner flow channel 1 of the electromagnetic induction heating heater 15 will be heated by the inner tube wall 2, and its energy comes from the eddy current generated by the high-frequency alternating magnetic field of the inner tube wall 2 and the inward heat transfer of the high-temperature heat transfer oil in the outer flow channel 3. In the heat exchange stage, the heat only comes from the inward heat transfer of the high-temperature heat transfer oil in the outer flow channel 3. After being heated in the electromagnetic induction heating heater 15, the circulating water is driven by the circulating water pump 17, leaves the electromagnetic induction heater 15 from the circulating water outlet 11, enters the heating radiator 16 to dissipate heat to the indoor space of the building, and then flows back from the circulating water inlet 10 to the inner flow channel 1 of the electromagnetic induction heating heater to continue to be heated, forming a cycle. Figure 4 As shown in the figure, in the heating stage, the low-temperature heat transfer oil enters the heat storage tank 13 from the lower part of the heat storage tank 13, and the high-temperature heat transfer oil flows out from the upper part of the heat storage tank 13. In order to reduce the heat transfer end difference, a downstream heat exchange arrangement is adopted, and the low-temperature circulating water to be heated enters from the lower part; in the heat exchange stage, the high-temperature heat transfer oil enters from the upper part of the heat storage tank 13, and the low-temperature heat transfer oil flows out from the lower part. In order to improve the heat exchange effect, a countercurrent heat exchange arrangement is adopted, and the circulating water also enters from the lower part with a lower temperature.

[0050] The amount and flow rate of circulating water need to be optimized, or can be adjusted and controlled in real time according to actual conditions.

[0051] When the temperature of the heat transfer oil or the circulating water rises to the upper limit of the set temperature range (slightly higher than the heating temperature), the electromagnetic induction heating heater will shut down until it needs to be restarted when reheating is required.

[0052] When the temperature of the outer tube wall 4 rises to a temperature slightly lower than the boiling point of the heat transfer oil, or the temperature of the inner tube wall 2 rises to a temperature slightly lower than the boiling point of the circulating water, the heat storage dual-fluid electromagnetic induction heating heater will start the over-temperature protection and cut off the coil power until the temperature drops below the over-temperature protection temperature.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention and should be included in the scope of the claims of the present invention.

Claims

1. A heat storage dual-medium electromagnetic induction heating heater, characterized in that: The electromagnetic induction heating heater (15) is a double-layer sleeve-shaped heater, which comprises, from the inside to the outside, an inner tube wall (2), an outer tube wall (4), an insulating material (5), an electromagnetic induction coil (6) and a plurality of magnetic conductors (7); wherein an inner flow channel (1) is formed on the inner side of the inner tube wall (2), and an outer flow channel (3) is formed between the inner tube wall (2) and the outer tube wall (4); the electromagnetic induction coil (6) simultaneously generates eddy currents in the inner tube wall (2) and the outer tube wall (4), thereby generating heat for heating the fluid in the inner flow channel (1) and the fluid in the outer flow channel (3); the fluid in the inner flow channel (1) is water; and the fluid in the outer flow channel (3) is heat transfer oil; The heat storage type dual-media electromagnetic induction heating heater comprises: a heat transfer oil circulation subsystem and a water circulation subsystem; the inner layer flow channel (1) is a circulating water flow channel; the outer layer flow channel (3) is a circulating heat transfer oil flow channel; The working process of the thermal oil circulation subsystem is divided into a heating stage, a heat storage stage, and a heat exchange stage; The heat transfer oil circulation subsystem uses heat transfer oil as a heating medium and a heat storage medium to form a heat transfer oil circuit; the heat transfer oil circulation subsystem further comprises: an electromagnetic induction heating heater (15), a vertical heat storage oil tank (13), an oil pump (14) and a drive control unit (12); the electromagnetic induction heating heater (15), the vertical heat storage oil tank (13) and the oil pump (14) are connected in sequence to form a closed loop; the electromagnetic induction heating heater (15) is also connected to the drive control unit (12); During the heat exchange stage, high-temperature heat transfer oil enters from the upper part of the vertical heat storage oil tank (13), and low-temperature heat transfer oil flows out from the lower part of the vertical heat storage oil tank (13); during the heat exchange stage, heat only comes from the inward heat transfer of the high-temperature heat transfer oil in the outer flow channel (3); water to be heated enters the inner flow channel (1) of the electromagnetic induction heating heater (15) from the lower circulating water inlet (10), leaves the electromagnetic induction heating heater (15) from the circulating water outlet (11), and performs countercurrent heat exchange with the heat transfer oil; when the temperature of the heat transfer oil in the vertical heat storage oil tank (13) is lower than the heat exchange requirement, the drive control unit (12) powers on the electromagnetic induction heating heater (15) for heating; During the heating stage, low-temperature heat transfer oil enters the vertical heat storage oil tank (13) from the lower part of the vertical heat storage oil tank (13), and high-temperature heat transfer oil flows out from the upper part of the vertical heat storage oil tank (13); when the driving control unit (12) energizes the electromagnetic induction heating heater (15) for heating, the circulating water in the inner flow channel (1) of the electromagnetic induction heating heater (15) is heated by the inner tube wall (2), and its energy comes from the eddy current generated by the high-frequency alternating magnetic field on the inner tube wall (2) and the high-temperature heat transfer oil in the outer flow channel (3). The water to be heated enters the inner flow channel (1) of the electromagnetic induction heating heater (15) from the lower circulating water inlet (10), leaves the electromagnetic induction heating heater (15) from the circulating water outlet (11), and exchanges heat with the heat transfer oil downstream; the high-temperature heat transfer oil serves as a heating medium, transferring heat to the circulating water in the inner flow channel (1); after being circulated and heated to a temperature close to the boiling point of water, the heat transfer oil enters the vertical heat storage oil tank (13) from the upper part of the vertical heat storage oil tank (13), i.e., the second heat transfer oil port (9); When the temperature of the heat transfer oil or the circulating water rises to the upper limit of the set temperature range, the electromagnetic induction heating heater will shut down until it needs to be reheated and restarted; When the temperature of the outer tube wall (4) rises to a temperature slightly lower than the boiling point of the heat transfer oil, or when the temperature of the inner tube wall (2) rises to a temperature slightly lower than the boiling point of the circulating water, the heat storage dual-fluid electromagnetic induction heating heater will start the over-temperature protection and cut off the power supply of the coil until the temperature drops below the over-temperature protection temperature.

2. The electromagnetic induction heating heater according to claim 1, characterized in that: The inner tube wall (2) and the outer tube wall (4) are both made of carbon steel or stainless steel material with a temperature resistance of more than 400°C.

3. The electromagnetic induction heating heater according to claim 1, characterized in that: The magnetic conductor (7) is used to guide and concentrate the magnetic field.

4. The heating system according to claim 1, characterized in that: The water circulation subsystem uses water as a circulation medium to form a water cycle; the water circulation subsystem further comprises: a drive control unit (12), an electromagnetic induction heating heater (15), a heating radiator (16) and a circulating water pump (17); the electromagnetic induction heating heater (15), the heating radiator (16) and the circulating water pump (17) are connected in sequence to form a closed loop.

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