A flow-type solid particle electromagnetic heating device

Abstract

The present invention discloses a flow-type solid particle electromagnetic heating device, which belongs to the field of energy storage technology. It comprises: a feed hopper, an electromagnetic heating tube, a stirring shaft, and a controllable speed discharge hopper. The feed hopper is connected to the electromagnetic heating tube, and the low-temperature solid particles flow down to the inside of the electromagnetic heating tube by gravity through the feed hopper. The solid particles exchange heat with the high-temperature tube wall of the electromagnetic heating tube, so that the low-temperature solid particles close to the tube wall are rapidly heated. The stirring shaft is installed inside the electromagnetic heating tube. When the stirring shaft is turned on, the heated particles close to the tube wall are rotated to the inside of the tube bundle and the low-temperature particles originally in the tube bundle are exchanged to the area close to the tube wall for heating. The controllable speed discharge hopper is connected to the outlet of the electromagnetic heating tube. When the solid particles are heated to the target value, the controllable speed discharge hopper is turned on to discharge the materials. The present invention can efficiently convert the surplus electricity during the low-voltage period of the power grid into the internal energy of the particles, and realize efficient and uniform heat exchange between the solid particles and the high-temperature wall.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and in particular relates to a flow-type solid particle electromagnetic heating device. Background Art

[0002] With the continuous development of society and the economy, the proportion of renewable energy in the overall energy system continues to expand. However, electricity generated by clean energy sources such as wind and solar energy is extremely volatile. Therefore, how to smooth out irregular power fluctuations and fill valleys has become a major challenge facing the current power grid. In recent years, with the continuous development of energy storage technology, an increasing number of energy storage materials have been used to regulate power fluctuations. Among them, solid particles have gradually become a research hotspot due to their low cost and sustained stability.

[0003] Solid particles have many advantages as a new type of energy storage material. For example, solid particles can enhance and improve existing molten salt technology, because solid particles (such as sand) remain inert and do not undergo chemical reactions at operating temperatures as high as 900°C and have very low costs. Compared with energy storage materials such as steam and hot oil, solid particles have a higher specific heat capacity and exhibit good heat storage performance. However, the current development of electricity-solid particle heat storage technology also faces many challenges, such as how to convert excess electricity into heat energy and effectively transfer it to solid particles, and how to ensure that the temperature of the particles reaches the set requirements.

[0004] Chinese invention patent CN114777545A discloses a solid particle heat storage device with integrated heat storage and exchange. The system uses an electric heating device at the bottom to heat the particles and achieves the purpose of heat exchange between the solid and other media through coils embedded in the particles. However, since the electric heating device is at the bottom of the entire device, the heating efficiency is low.

[0005] Chinese invention patent CN111075668A discloses an electricity storage system that uses solid particles to store heat. The system converts surplus electricity into thermal energy in solid particles for storage. When electricity is needed externally, the high-temperature solid particles are heat-exchanged with other low-temperature, high-pressure media to become a high-temperature, high-pressure working fluid for power generation, completing the electricity-heat-electricity conversion process. However, the electricity-heat conversion efficiency of the entire system is low.

[0006] Chinese invention patent CN114963819A discloses a fluidized bed heat exchange system and heat exchanger for integrated thermal storage and power generation. This system uses electric heating to heat solid particles and then exchanges heat with carbon dioxide. The carbon dioxide is then used to enter a turbine device to generate electricity. However, the overall device still does not fundamentally solve the problem of low electricity-to-particle heat energy conversion efficiency.

[0007] Chinese invention patent CN113048658A discloses a continuously operating fluidized bed solar particle heat absorption and storage system. The system completes the conversion of solar energy into particle internal energy by fluidizing and transporting solid particles. However, the internal particle flow and heat exchange are not uniform, making it difficult to achieve the effect of uniform particle temperature rise.

[0008] In summary, existing solid particle heat storage systems for solar or electrical energy all suffer from uneven heat transfer and low efficiency. Therefore, how to control the temperature of the solid particles and improve the heat transfer efficiency has become a research focus. Summary of the Invention

[0009] The present invention is proposed to solve the problem of low efficiency of using solid particles to store electric energy during power off periods.

[0010] One of the purposes of the present invention is to provide a flow-type solid particle electromagnetic heating device, which comprises:

[0011] A feeding hopper is used to add solid particles to the top of the electromagnetic heating tube;

[0012] The electromagnetic heating tube is vertically arranged as a whole, with an electromagnetic heating tape evenly wound on its outer tube wall and a plurality of heating fin groups arranged on its inner tube wall;

[0013] A stirring shaft is arranged along the central axis of the electromagnetic heating tube, the stirring shaft includes multiple stirring sections, and the stirring sections and the arrangement intervals of the heating fin groups are alternately arranged in the height direction; the stirring sections are equipped with a first stirring paddle for migrating high-temperature particles on the tube wall side to the tube center, or a second stirring paddle for migrating particles in the tube center to the tube wall side; the stirring paddles installed in the same stirring section are of exactly the same type, while the stirring paddles installed in adjacent stirring sections are of different types;

[0014] The speed-controllable discharge hopper is connected to the bottom of the electromagnetic heating tube and is used to discharge the solid particles in the electromagnetic heating tube.

[0015] As a preferred embodiment of the present invention, the stirring blades of the first stirring paddle and the second stirring paddle are both curved blades, and the blades are spot-welded to the rotating shaft by a cross bar; the cross bar of the first stirring paddle is longer, and the cross bar of the second stirring paddle is shorter. The part below the welding point of the blade of the first stirring paddle is narrower and close to the rotating shaft, and the blade position above the welding point is wider and away from the rotating shaft. The angle between the blade of the first stirring paddle and the cross bar is 100-150°, the part below the welding point of the blade of the second stirring paddle is narrower and away from the rotating shaft, and the blade position above the welding point is wider and close to the rotating shaft. The angle between the blade of the second stirring paddle and the cross bar is 50-80°, and the blade diameter of the first stirring paddle and the second stirring paddle is 70-90% of the inner diameter of the electromagnetic heating tube.

[0016] As a preferred embodiment of the present invention, an inclined feed baffle is provided in the feed hopper; a conveyor belt adds solid particles into the feed hopper, and the inclined feed baffle is located at the bottom of the feed hopper, on which a feed particle vibration device is provided to ensure that the solid particles are evenly distributed and completely enter the electromagnetic heating tube.

[0017] As a preferred embodiment of the present invention, the feed particle vibration device includes: a vibrating screen, a fixing bolt, a hard spring, and a motor; the vibrating screen is fixed to the inclined feed baffle by the fixing bolt, and there is a distance from the bottom surface of the inclined feed baffle. The vibrating screen is a quadrilateral, and a hard spring is fixed on each corner of its lower surface. The vibrating screen prevents solid particles from accumulating during feeding; the motor provides vibration power for the vibrating screen, and the solid particles enter the entrance of the inclined baffle through the conveyor belt, and the particles continuously enter the entrance of the electromagnetic heating tube through the vibrating screen.

[0018] As a preferred embodiment of the present invention, the electromagnetic heating tube also includes: heating ribs, a particle inlet, a particle outlet, a rotating bearing, and a support bracket; the heating ribs are arranged on the inner tube wall of the electromagnetic heating tube to transfer heat to the solid particles in contact with them; the particle inlet is connected to the outlet of the feed hopper, and the particle outlet is connected to the inlet of the controllable speed discharge hopper; one end of the support bracket is connected to the bottom of the electromagnetic heating tube, and the other end is connected to the rotating bearing; the rotating bearing is connected to the stirring shaft to support the stirring shaft and enable the stirring shaft to rotate freely.

[0019] As a preferred embodiment of the present invention, the stirring shaft includes: an adjustable motor and a rotating central shaft; the adjustable motor is connected to the rotating central shaft to control the rotation speed of the rotating central shaft; the part of the rotating central shaft where the stirring paddle is not installed is the optical axis; the rotating central shaft and the stirring paddle are connected by an annular welding ring.

[0020] As a preferred embodiment of the present invention, the controllable speed discharge hopper includes: a variable speed motor, a star-shaped feeder, and an inclined discharge baffle; the variable speed motor is used to adjust the rotation speed of the star-shaped feeder to reasonably discharge solid particles, and both are located at the discharge end of the controllable speed discharge hopper; a discharge particle vibration device is provided on the inclined discharge baffle to completely discharge the solid particles and enable the stirring shaft to more fully stir the solid particles.

[0021] As a preferred embodiment of the present invention, the discharge particle vibration device includes: a vibrating screen, a fixing bolt, and a hard spring; the vibrating screen is fixed to the inclined discharge baffle by the fixing bolt, and there is a distance from the bottom surface of the inclined feed baffle. The vibrating screen is a quadrilateral, and a hard spring is fixed on each corner of its lower surface to prevent particles from accumulating at the bottom of the electromagnetic heating tube.

[0022] Preferably, the device also includes an intelligent control system, which includes: a data acquisition card, a data acquisition line, a computer, and a high-temperature resistant thermocouple group; the high-temperature resistant thermocouple groups are respectively arranged in the feed hopper, the electromagnetic heating tube, and the controllable speed discharge hopper, and the high-temperature resistant thermocouple group at each position includes multiple high-temperature resistant thermocouples, which respectively measure the particle temperature at the center, middle, and near the wall; the high-temperature resistant thermocouples monitor the particle temperature and transmit it to the data acquisition card through the data acquisition line, and then transmit it to the computer for data processing.

[0023] The present invention also provides a flow-type solid particle electromagnetic heating method based on the device, which comprises the following steps:

[0024] When the power is low, the electromagnetic heating tube is heated by electricity; the low-temperature particles enter the feed hopper via a conveyor belt, and a feed particle vibration device is installed in the feed hopper to prevent particle accumulation;

[0025] Low-temperature particles enter the electromagnetic heating tube, which is equipped with rectangular or triangular fins to expand the high-temperature surface inside the tube. The low-temperature particles close to the high-temperature surface inside the tube are in full contact with the tube wall and fins, and the temperature of these particles rises rapidly. At this time, the particles continue to flow downward. When the particles pass through the stirring section, the second stirring paddle causes the heated particles previously close to the tube wall to rotate into the center of the tube. The first stirring paddle causes the particles in the center of the tube to be rotated to the periphery of the tube wall, where they are in continuous contact with the high-temperature wall surface, and the temperature rises rapidly. The fin area and stirring section are intermittently arranged throughout the entire tube to couple the exchange position of the particles with efficient heat transfer to achieve the effect of rapid heating of the particles.

[0026] The high-temperature particles eventually enter the controllable-speed discharge hopper, which is equipped with a particle vibration device to prevent particle accumulation. A star-shaped feeder is also provided in the controllable-speed discharge hopper to adjust the solid particle discharge speed.

[0027] The high-temperature solid particles after discharge supply heat to heat users or store heat. After the heat is released, the solid particles are transported to the feed hopper by the conveyor belt to realize the circulation of solid particles.

[0028] The temperature of all measuring points is monitored in real time by a high-temperature resistant thermocouple group. When the temperature of the three thermocouples arranged at the same position in the electromagnetic heating tube is uneven, the stirring speed is increased to make the temperature in the tube bundle uniform. When the outlet particle temperature does not meet the heat user's requirements, the speed of the star feeder is adjusted to change the discharge speed and control the particle temperature, thus completing the temperature self-regulation process.

[0029] Compared with the prior art, the present invention has the following innovations and beneficial effects:

[0030] (1) The surplus electricity during the off-peak period of the power grid is efficiently converted into particle internal energy.

[0031] (2) The proposed plow-type auger and fin-type electromagnetic heating tube achieve efficient and uniform heat exchange between solid particles and high-temperature wall surfaces.

[0032] (3) The temperature and flow requirements of different heat users can be achieved through computers, variable speed motors, rotating shafts, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the overall structure of a flow-type solid particle electromagnetic heating device;

[0034] Figure 2 This is a diagram of the first stirring paddle and the second stirring paddle blade arrangement;

[0035] Figure 3 It is the top view of 4 groups of rectangular fins;

[0036] Figure 4 This is a top view of 6 groups of triangular fins.

[0037] Explanation of the reference numerals: 1 feeding hopper; 1-1 conveyor belt; 1-2 inclined feeding baffle; 1-3 vibrating screen; 2 electromagnetic heating tube; 2-1 electromagnetic heating winding belt; 2-2 heating ribs; 2-3 particle inlet; 2-4 particle outlet; 2-5 rotating bearing; 2-6 supporting bracket; 3 stirring shaft; 3-1 adjustable motor; 3-2 rotating central shaft, 3-3 blades; 4 controllable speed discharging hopper; 4-1 variable speed motor; 4-2 star feeder; 4-3 vibrating screen; 4-6 inclined discharging baffle; 5 heat user; 6 intelligent control system; 6-1 data acquisition card; 6-2 data acquisition line; 6-3 computer; 6-4-1 high temperature resistant thermocouple A; 6-4-2 high temperature resistant thermocouple B; 6-4-3 high temperature resistant thermocouple C; 6-4-4 high temperature resistant thermocouple D. DETAILED DESCRIPTION

[0038] The present invention will be further described and illustrated below in conjunction with specific embodiments. The embodiments are merely illustrative of the present disclosure and do not limit its scope. The technical features of the various embodiments of the present invention may be combined accordingly, provided that there is no conflict between them.

[0039] This invention combines solid particles with a traditional finned heat exchanger to improve heat exchange efficiency between the particles and the tube wall. Furthermore, a plow-type stirring device is introduced, allowing the particles within the heat exchange tube to migrate inward and outward, ensuring that all particles exchange heat with the outer wall, achieving a uniform temperature increase. Finally, a star-shaped feeder at the bottom of the heat exchange tube controls the particle flow rate, ensuring that the particles reach a set temperature before being discharged uniformly.

[0040] One of the objectives of the present invention is to provide an apparatus for efficiently converting excess electricity during off-peak periods into energy within solid particles, thereby achieving peak-shaving and valley-filling. The apparatus comprises: a feed hopper 1, an electromagnetic heating tube 2, a stirring shaft 3, and a controllable-speed discharge hopper 4. The feed hopper 1 is connected to the electromagnetic heating tube 2. Low-temperature solid particles flow downward by gravity through the feed hopper 1 into the interior of the electromagnetic heating tube 2. The solid particles exchange heat with the high-temperature tube wall of the electromagnetic heating tube 2, rapidly heating the low-temperature solid particles near the tube wall. The stirring shaft 3 is installed within the electromagnetic heating tube 2. When the stirring shaft 3 is turned on, the heated particles near the tube wall are rotated into the interior of the tube bundle, and the low-temperature particles originally in the tube bundle are exchanged to the area near the tube wall for heating. The controllable-speed discharge hopper 4 is connected to the outlet of the electromagnetic heating tube 2. When the solid particles reach the target temperature, the controllable-speed discharge hopper 4 is turned on to discharge the solid particles to a heat user 5. The solid particles that have completed the heat exchange are then transferred back to the feed hopper 1 to initiate the next charging and discharging process.

[0041] Feed hopper 1 primarily comprises a conveyor belt 1-1, an inclined feed baffle 1-2, a vibrating screen 1-3, fixing bolts, a rigid spring, and a motor. The conveyor belt 1-1 and inclined feed baffle 1-2 form the main frame of feed hopper 1. Vibrating screen 1-3 is secured to inclined feed baffle 1-2 via fixing bolts, at a distance from its bottom. Vibrating screen 1-3 is a quadrilateral with a rigid spring fixed to each corner of its lower surface. The motor powers vibrating screen 1-3. Low-temperature solid particles pass through conveyor belt 1-1 and enter the entrance of inclined baffle 1-2. The particles then pass through vibrating screen 1-3 to prevent accumulation and continuously enter the entrance of electromagnetic heating tube bundle 2.

[0042] The electromagnetic heating tube 2 primarily comprises an electromagnetic heating wrap 2-1, heating fins 2-2, a particle inlet 2-3, a particle outlet 2-4, a rotary bearing 2-5, and a support bracket 2-6. The electromagnetic heating wrap 2-1 is connected to the power grid to absorb excess electricity during low-power periods and is evenly wrapped around the outside of the tube wall to heat it. The heating fins 2-2 are arranged within the tube bundle and come in two types: triangular and rectangular. Four to eight fins are arranged in groups. The particle inlet 2-3 is connected to the outlet of the feed hopper 1, while the particle outlet 2-4 is connected to the inlet of the speed-controlled discharge hopper 4. One end of the support bracket 2-6 is welded to the bottom of the electromagnetic heating tube 2, and the other end is connected to the rotary bearing 2-5. The rotary bearing 2-5 is connected to the stirring shaft 3, providing support while allowing the shaft to rotate freely.

[0043] The rotating shaft 3 primarily comprises an adjustable motor 3-1, a rotating shaft 3-2, and stirring paddles 3-3. The adjustable motor 3-1 is connected to the rotating shaft 3-2 to control its speed. Two to six sets of stirring paddles 3-3 are mounted on the rotating shaft 3-2. The mounting positions of the stirring paddles 3-3 do not overlap with the arrangement of the heating fins 2-2 to prevent potential collisions between the heating fins 2-2 and the stirring paddles 3-3. The portion of the rotating shaft 3-2 where the stirring paddles 3-3 are not mounted serves as an optical axis.

[0044] like Figure 2 As shown, the stirring paddle 3-3 can be divided into two forms. The first is the first stirring paddle, which is used to move the high-temperature particles on the side of the tube wall to the center of the tube. Its shape is as follows: Figure 2 As shown in the upper left part, the first stirring paddle has a curved blade, and the blade is spot-welded to the rotating shaft with a crossbar. The crossbar of the first stirring paddle is longer, and the portion below the welding point of the blade of the first stirring paddle is narrower and closer to the rotating shaft, while the portion above the welding point is wider and farther away from the rotating shaft. The angle between the blade of the first stirring paddle and the crossbar is 100-150°. The second type is the second stirring paddle, which is used to move particles in the center of the tube to the side of the tube wall. Its shape is as follows: Figure 2 As shown in the upper right corner, the second stirring paddle's stirring blade is also curved, spot-welded to the rotating shaft by a crossbar. The crossbar is shorter, narrower below the weld point and farther from the rotating shaft, while wider above the weld point and closer to the shaft. The angle between the blade and the crossbar is 50-80°. The diameter of the blades of the first and second stirring paddles is 70-90% of the inner diameter of the electromagnetic heating tube 2. An annular weld ring 3-3-3 connects the blades to the rotating shaft 3-2.

[0045] like Figure 1 As shown, in a specific embodiment, the stirring shaft 3 includes multiple stirring sections, and the arrangement intervals of the stirring sections and the heating fin groups are alternately arranged along the height direction; the stirring paddles installed in the same stirring section are exactly the same in form, and the stirring paddles installed in adjacent stirring sections are different in form.

[0046] The controllable-speed discharge hopper 4 primarily comprises a variable-speed motor 4-1, a star-shaped feeder 4-2, a vibrating screen 4-3, fixing bolts, a rigid spring, and an inclined discharge baffle 4-6. The variable-speed motor 4-1 adjusts the speed of the star-shaped feeder 4-2 to ensure optimal discharge of solid particles. The vibrating screen 4-3 is secured to the inclined discharge baffle 4-6 via fixing bolts and is positioned a certain distance from the bottom of the inclined feed baffle 4-6. The vibrating screen 4-3 is quadrilateral, with a rigid spring fixed to each corner of its lower surface to prevent particles from accumulating at the bottom of the tube bundle.

[0047] The intelligent control system 6 mainly includes: data acquisition card 6-1, data acquisition line 6-2, computer 6-3, and high temperature resistant thermocouple group. The high temperature resistant thermocouple group is respectively arranged in the feed hopper 1, electromagnetic heating tube 2 and controllable speed discharge hopper 4. The high temperature resistant thermocouple group at each position includes multiple high temperature resistant thermocouples, which respectively measure the particle temperature at the center, middle and near the wall. Figure 1 As shown, in this embodiment, high-temperature thermocouple A6-4-1 is located on conveyor belt 1-1 and is used to detect the temperature of solid particles on conveyor belt 1-1 that have completed heat exchange. Similarly, high-temperature thermocouples B6-4-2, C6-4-3, and D6-4-4 are located at different locations in the device to measure the temperature of the center, middle, and near the wall of the particles at different locations. The high-temperature thermocouples monitor the particle temperature and transmit it to data acquisition card 6-1 via data acquisition line 6-2. The data is then transferred to the software in computer 6-3 for data processing.

[0048] Before the device is turned on, the entire device is first purged with cold air to remove any debris. Particle outlet 2-4 is then closed, and solid particles are poured onto conveyor belt 1-1. These particles pass through conveyor belt 1-1 and enter inclined feed baffle 1-2. They then pass through vibrating screen 1-3 and continuously enter electromagnetic heating tube bundle 2. Once the tubes have filled with solid particles, the conveyor belt is stopped, and the electromagnetic heating wrap 2-1 is powered on to electromagnetically heat the tube walls. Once the tube walls reach 800°C, rotating shaft 3 is activated, and data from each high-temperature-resistant thermocouple 6-4 is monitored. When the data collected by the three thermocouples at the bottom of the tube bundle is consistent and meets the requirements of heat user 5, particle outlet 2-4 is opened, and the particles pass through vibrating screen 4-3 and enter the inclined discharge baffle 4-6 into star feeder 4-2. The star feeder begins operating under the control of variable speed motor 4-1 controlled by computer 6-3 and begins feeding heat user 5.

[0049] After receiving the high-temperature pellets, heat user 5 can store or directly utilize them, depending on the user's selected function. When the heat user selects temporary storage, the star-shaped feeder 4-2 begins discharging while continuing to pour material onto conveyor belt 1-1. The pellets are continuously heated and collected, completing the conversion of electrical energy into pellet internal energy. When the heat user 5 selects direct utilization, the high-temperature pellets enter the heat exchanger after entering the heat user 5 and exchange heat energy with the low-temperature medium. After the heat exchange, the low-temperature pellets are discharged onto conveyor belt 1-1 and then transported to the feed hopper 1, completing the continuous conversion of electrical energy into pellet internal energy.

[0050] The temperature of all measuring points is monitored in real time by high-temperature resistant thermocouples. When the temperatures of the three thermocouples arranged at the same position in the tube bundle are uneven, the speed of the rotating shaft is increased by adjusting the variable speed motor to make the temperature inside the tube bundle uniform. When the outlet particle temperature does not meet the heat user's requirements, the speed of the star feeder is reduced or increased to control the particle temperature, thus completing the temperature self-regulation process.

[0051] The above-described embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. Persons skilled in the art will readily appreciate that variations and modifications may be made without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A flow-type solid particle electromagnetic heating device, characterized in that: include: A feeding hopper (1) is used to add solid particles to the top of the electromagnetic heating tube (2); The electromagnetic heating tube (2) is vertically arranged as a whole, an electromagnetic heating wrapping belt (2-1) is evenly wrapped around its outer tube wall, and a plurality of heating fin groups are arranged on its inner tube wall; A stirring shaft (3) is arranged along the central axis of the electromagnetic heating tube (2), the stirring shaft (3) comprising a plurality of stirring sections, wherein the stirring sections and the arrangement intervals of the heating fin groups are alternately arranged in the height direction; a first stirring paddle for migrating high-temperature particles on the tube wall side to the tube center or a second stirring paddle for migrating particles at the tube center to the tube wall side is installed in the stirring section; and the stirring paddles installed in the same stirring section are of exactly the same form, while the stirring paddles installed in adjacent stirring sections are of different forms; The speed-controllable discharge hopper (4) is connected to the bottom of the electromagnetic heating tube (2) and is used to discharge the solid particles in the electromagnetic heating tube (2).

2. The flow-type solid particle electromagnetic heating device according to claim 1, characterized in that: The stirring blades of the first stirring paddle and the second stirring paddle are both curved blades, and the blades are spot-welded to the rotating shaft by a cross bar; the cross bar of the first stirring paddle is longer, and the cross bar of the second stirring paddle is shorter; the portion below the welding point of the blade of the first stirring paddle is narrower and closer to the rotating shaft, and the portion above the welding point of the blade is wider and farther away from the rotating shaft; the angle between the blade of the first stirring paddle and the cross bar is 100-150°; the portion below the welding point of the blade of the second stirring paddle is narrower and farther away from the rotating shaft, and the portion above the welding point of the blade is wider and closer to the rotating shaft; the angle between the blade of the second stirring paddle and the cross bar is 50-80°; and the diameter of the blades of the first stirring paddle and the second stirring paddle is 70-90% of the inner diameter of the electromagnetic heating tube (2).

3. The flow-type solid particle electromagnetic heating device according to claim 1, characterized in that: An inclined feed baffle (1-2) is provided in the feed hopper (1); a conveyor belt (1-1) adds solid particles into the feed hopper (1); the inclined feed baffle (1-2) is located at the bottom of the feed hopper (1), and a feed particle vibration device is provided on the inclined feed baffle, so that the solid particles are evenly distributed and completely enter the electromagnetic heating tube (2).

4. The flow-type solid particle electromagnetic heating device according to claim 3, characterized in that: The feeding particle vibration device includes: a vibrating screen, a fixing bolt, a hard spring, and a motor; the vibrating screen is fixed to the inclined feeding baffle by the fixing bolt, and is at a distance from the bottom surface of the inclined feeding baffle. The vibrating screen is quadrilateral, and a hard spring is fixed on each corner of its lower surface. The vibrating screen prevents solid particles from accumulating during feeding; the motor provides vibration power for the vibrating screen, and the solid particles enter the inlet of the inclined baffle through the conveyor belt, and the particles continuously enter the inlet of the electromagnetic heating tube through the vibrating screen.

5. The flow-type solid particle electromagnetic heating device according to claim 1, characterized in that: The electromagnetic heating tube (2) further comprises: heating fins (2-2), a particle inlet (2-3), a particle outlet (2-4), a rotary bearing (2-5), and a support bracket (2-6); the heating fins (2-2) are arranged on the inner tube wall of the electromagnetic heating tube (2) to transfer heat to the solid particles in contact with the heating fins; the particle inlet (2-3) is connected to the outlet of the feed hopper (1), and the particle outlet (2-4) is connected to the inlet of the speed-controllable discharge hopper (4); one end of the support bracket (2-6) is connected to the bottom of the electromagnetic heating tube (2), and the other end is connected to the rotary bearing (2-5); the rotary bearing (2-5) is connected to the stirring shaft (3), supports the stirring shaft (3) and enables the stirring shaft (3) to rotate freely.

6. The flow-type solid particle electromagnetic heating device according to claim 1, characterized in that: The stirring shaft (3) comprises: an adjustable motor (3-1) and a rotating central shaft (3-2); wherein the adjustable motor (3-1) is connected to the rotating central shaft (3-2) to control the rotation speed of the rotating central shaft (3-2); the portion of the rotating central shaft (3-2) not equipped with a stirring paddle is an optical axis; and the rotating central shaft (3-2) and the stirring paddle are connected via an annular welding ring (3-3-3).

7. The flow-type solid particle electromagnetic heating device according to claim 1, characterized in that: The controllable speed discharge hopper (4) comprises: a variable speed motor (4-1), a star-shaped feeder (4-2), and an inclined discharge baffle (4-6); the variable speed motor (4-1) is used to adjust the rotation speed of the star-shaped feeder (4-2) to reasonably discharge solid particles, and both are located at the discharge end of the controllable speed discharge hopper (4); a discharge particle vibration device is provided on the inclined discharge baffle (4-6) to completely discharge the solid particles and enable the stirring shaft (3) to more fully stir the solid particles.

8. The flow-type solid particle electromagnetic heating device according to claim 7, characterized in that: The discharge particle vibration device includes: a vibrating screen, a fixing bolt, and a hard spring; the vibrating screen is fixed to the inclined discharge baffle by the fixing bolt, and is at a distance from the bottom surface of the inclined feed baffle. The vibrating screen is a quadrilateral, and a hard spring is fixed on each corner of its lower surface to prevent particles from accumulating at the bottom of the electromagnetic heating tube.

9. The flow-type solid particle electromagnetic heating device according to claim 1, characterized in that: The device further comprises an intelligent control system (6), which comprises: a data acquisition card (6-1), a data acquisition line (6-2), a computer (6-3), and a high-temperature resistant thermocouple group; the high-temperature resistant thermocouple group is respectively arranged in the feed hopper (1), the electromagnetic heating tube (2), and the controllable speed discharge hopper (4); the high-temperature resistant thermocouple group at each position comprises a plurality of high-temperature resistant thermocouples, which respectively measure the particle temperature at the center, the middle, and the near-wall surface; the high-temperature resistant thermocouple monitors the particle temperature and transmits it to the data acquisition card (6-1) through the data acquisition line (6-2), and then transmits it to the computer (6-3) for data processing.

10. A method for electromagnetically heating flowing solid particles based on the device of claim 1, characterized in that: The steps include: When the power is low, the electromagnetic heating tube (2) is heated by electricity; the low-temperature particles enter the feed hopper (1) via a conveyor belt, and a feed particle vibration device is provided in the feed hopper (1) to prevent particle accumulation; Low-temperature particles enter the electromagnetic heating tube (2), which is internally provided with rectangular or triangular fins for expanding the high-temperature surface inside the tube. The low-temperature particles close to the high-temperature surface inside the tube are in full contact with the tube wall and the fins, and the temperature of these particles rises rapidly. At this time, the particles continue to flow downward. When the particles pass through the stirring section, the second stirring paddle causes the heated particles previously close to the tube wall to rotate into the central area of ​​the tube, and the first stirring paddle causes the particles at the center of the tube to be rotated to the outer periphery of the tube wall, and to be in continuous contact with the high-temperature wall surface, and the temperature rises rapidly. The fin area and stirring section are intermittently provided throughout the tube, coupling the exchange position of the particles with efficient heat transfer, thereby achieving a rapid heating effect of the particles. The high-temperature particles eventually enter the controllable-speed discharging hopper (4), which is provided with a particle vibration device to prevent particle accumulation, and a star-shaped feeder (4-2) is provided in the controllable-speed discharging hopper (4) to adjust the solid particle discharging speed; The high-temperature solid particles after discharge supply heat to heat users or store heat. After the heat is released, the solid particles are transported to the feed hopper (1) by a conveyor belt to realize the circulation of the solid particles. The temperature of all measuring points is monitored in real time by a high-temperature resistant thermocouple group. When the temperature of the three thermocouples arranged at the same position in the electromagnetic heating tube is uneven, the stirring speed is increased to make the temperature in the tube bundle uniform. When the outlet particle temperature does not meet the heat user's requirements, the speed of the star feeder is adjusted to change the discharge speed and control the particle temperature, thus completing the temperature self-regulation process.

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