Electro-thermal conversion system based on electromagnetic induction

Abstract

The invention provides an electro-thermal conversion system based on electromagnetic induction, and the system comprises a fluidized bed which is provided with a gas inlet, a gas outlet, a material inlet and a material outlet, and is used for placing solid particles; the induction coil is hollow inside, is arranged in the fluidized bed and is used for being connected with a power supply end; wherein cooling gas is introduced into the induction coil, and the induction coil is filled with insulating particles; wherein the induction coil is electrified to generate a magnetic field, the solid particles are heated, target gas is introduced into the fluidized bed to enable the solid particles to be in a fluidized state, meanwhile, the cooling gas is introduced into the induction coil and exchanges heat with the induction coil under the assistance of the insulating particles, and the induction coil is cooled. Through the system provided by the invention, the problems of large coil loss and difficult coil cooling in the current electromagnetic induction heating technology are solved.

Description

Technical Field

[0001] The present application relates to the technical field of electrothermal conversion, and in particular to an electrothermal conversion system based on electromagnetic induction. Background Art

[0002] Photovoltaic power, wind power and other clean electricity can effectively improve the national energy structure, but due to their instability and intermittency, energy storage technology is needed as an intermediate bridge to convert them into stable and controllable energy. As the most mature application, electrothermal conversion technology can absorb clean electricity on a large scale, store it in the form of thermal energy, and convert it into electricity or thermal energy for output when needed.

[0003] For low-power, small-scale heaters, resistance heating has the advantages of simple structure and low cost; however, since resistance heating elements are difficult to scale up and have low heat transfer efficiency, they cannot be applied to large-scale, high-power electric heaters.

[0004] Electromagnetic induction can be applied to large-scale, high-power electric heaters due to its cleanliness and speed, but it has problems such as large coil loss and difficulty in coil cooling. Summary of the invention

[0005] In view of the above problems, the present invention provides an electromagnetic induction-based electric heat conversion system to solve the problems of large coil loss and difficult coil cooling in the current electromagnetic induction heating technology.

[0006] The present invention provides an electromagnetic induction-based electrothermal conversion system, and the technical solution adopted is: An electrothermal conversion system based on electromagnetic induction, the system comprising: A fluidized bed is provided with a gas inlet, a gas outlet, a material inlet and a material outlet, and the fluidized bed is used to place solid particles; An induction coil, which is hollow inside, is disposed in the fluidized bed and is used to be connected to a power supply terminal; Wherein, cooling gas is passed into the induction coil and the induction coil is filled with insulating particles; The induction coil is energized to generate a magnetic field to heat the solid particles, and the target gas is introduced into the fluidized bed to fluidize the solid particles. At the same time, the cooling gas is introduced into the induction coil to exchange heat with the induction coil with the assistance of the insulating particles to cool the induction coil.

[0007] As one of the preferred solutions, the gas outlet shares a portion of the flow path with the material inlet and is connected to the induction coil; is defined such that: The target gas in the fluidized bed is discharged through the gas outlet, exchanges heat with the solid particles entering the fluidized bed through the material inlet, preheats the solid particles, and cools itself to enter the induction coil as the cooling gas.

[0008] As one of the preferred solutions, the system further comprises: The heating element is arranged in close distance to the induction coil.

[0009] As one of the preferred solutions, a heat-insulating layer is provided on one side of the heating element to divide the fluidized bed into a high-temperature zone and a low-temperature zone; The material inlet is correspondingly connected to the low temperature zone, and the induction coil is arranged in the low temperature zone, so that the solid particles contact the induction coil located in the low temperature zone, heat the solid particles, and cool the induction coil at the same time.

[0010] As one of the preferred solutions, a distribution plate is provided in the fluidized bed, and the distribution plate is provided above the gas inlet; Wherein, the distribution plate is separated from or abuts against the heating element.

[0011] As one of the preferred solutions, the heating element is a hollow tubular structure and is arranged in the middle area of ​​the fluidized bed.

[0012] As one of the preferred solutions, magnetic conductive material is arranged in the fluidized bed.

[0013] As one of the preferred solutions, the system further includes: The material cylinder is connected with the material inlet through a feed pipe, and a material valve is arranged on the feed pipe.

[0014] As one of the preferred solutions, the induction coil is made of copper.

[0015] As one of the preferred solutions, the induction coil is coated with a thermally conductive insulating material.

[0016] Compared with the prior art, this application has the following advantages: The present invention provides an electromagnetic induction-based electric heat conversion system, which includes: a fluidized bed, which is provided with a gas inlet, a gas outlet, a material inlet and a material outlet, and the fluidized bed is used to place solid particles; an induction coil, which is hollow inside and is arranged in the fluidized bed and is used to be connected to a power supply end; wherein cooling gas is passed into the induction coil and is filled with insulating particles; wherein the induction coil is energized to generate a magnetic field to heat the solid particles, and a target gas is passed into the fluidized bed to put the solid particles in a fluidized state, and at the same time, the cooling gas is passed into the induction coil to perform heat exchange with the induction coil with the assistance of the insulating particles to cool the induction coil.

[0017] In this way, the induction coil generates a magnetic field after being energized, the temperature of the induction coil increases, the target gas enters the fluidized bed through the gas inlet, and acts as a fluidizing gas to fluidize the solid particles, thereby improving the heat absorption efficiency of the solid particles in the magnetic field, and the solid particles store heat energy. The fluidizing gas is discharged from the fluidized bed from the gas outlet, and the solid particles after absorbing heat are discharged from the fluidized bed through the material outlet. In this process, the cooling gas flows into the induction coil, exchanges heat with the coil and the insulating particles, absorbs the heat generated by the induction coil, the temperature of the induction coil decreases, and the temperature of the cooling gas increases. The cooling gas after absorbing heat is discharged from the fluidized bed through the gas outlet opened on the fluidized bed, or the cooling gas after absorbing heat continues to act as a fluidizing gas after flowing out of the induction coil, and is transported to the fluidized solid particles in the fluidized bed, and continues to transfer heat to the solid particles, reducing energy loss. Therefore, during high-power electromagnetic induction heating, for copper coils that withstand lower temperatures, the copper induction coils can be quickly and efficiently cooled to prevent overheating and damage, solving the problem of high loss and difficult cooling of high-power copper coils, thereby expanding the potential of copper coils in high-power electromagnetic induction heating applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a structural schematic diagram of the electromagnetic induction electrothermal conversion system according to the first embodiment of the present application; Figure 2 It is a structural schematic diagram of the electromagnetic induction electrothermal conversion system described in Example 2 of the present application; Figure 3 It is a structural schematic diagram of the electromagnetic induction electrothermal conversion system described in the third embodiment of the present application; Figure 4It is a structural schematic diagram of the electromagnetic induction electrothermal conversion system described in Example 4 of the present application.

[0020] Description of reference numerals: 1. Induction coil; 2. Heating element; 3. Distribution plate; 4. Material barrel; 5. Material valve; 6. High magnetic permeability material. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0022] It should be noted that when a metal workpiece is placed in the induction coil 1, the alternating magnetic field will generate an induced current inside the metal. When the induced current flows inside the metal, due to the resistance of the metal, the current will generate heat, and the metal workpiece will reach the required high temperature in a short time, completing the heating process. Therefore, the efficiency of electromagnetic induction heating is usually high, and large-scale materials or liquids can be heated quickly and evenly, improving the utilization efficiency of thermal energy.

[0023] Nowadays, photovoltaic power generation systems or wind turbines are integrated with electromagnetic induction heating equipment to utilize electricity generated by renewable energy, and then use electromagnetic induction heating technology to heat metal materials or liquids, further improving the energy efficiency of the entire system and reducing energy losses. At the same time, it meets the goal of sustainable development and has broad market application potential in industrial manufacturing, home and commercial heating, agricultural applications, food processing and other fields.

[0024] In high-power (>MW) electromagnetic induction heating, copper coils face temperature limitations and are usually used at low temperatures. Therefore, in high-power applications, an effective cooling system is required to maintain the performance and safety of the coils. However, the coils in today's electromagnetic induction heating systems generate a lot of heat and are wasted, resulting in low electromagnetic induction heating efficiency. At the same time, there are problems such as long coil cooling time and difficulty in cooling.

[0025] In view of this, Figure 1 - 4 respectively show the different structural compositions of the electromagnetic induction electrothermal conversion system of the present invention.

[0026] A system for electrothermal conversion based on electromagnetic induction, the system comprising: a fluidized bed, provided with a gas inlet, a gas outlet, a material inlet and a material outlet, wherein the fluidized bed is used to place solid particles; an induction coil 1, which is hollow inside and is arranged in the fluidized bed and is used to be connected to a power supply end; wherein cooling gas is passed into the induction coil 1 and is filled with insulating particles; wherein the induction coil 1 is energized to generate a magnetic field to heat the solid particles, a target gas is passed into the fluidized bed to put the solid particles in a fluidized state, and at the same time the cooling gas is passed into the induction coil 1 to perform heat exchange with the induction coil 1 with the assistance of the insulating particles to cool the induction coil 1.

[0027] Specifically, the fluidized bed is used as a heating shell, and a gas inlet, a gas outlet, a material inlet and a material outlet are provided on the shell. The gas inlet is used to input gas, and the gas outlet is used to discharge gas, so as to manage the flow circulation of gas. The material inlet is used to input solid particles, and the material outlet is used to discharge solid particles, so as to manage the flow circulation of solid particles.

[0028] It can be known that each inlet and outlet is connected to the fluidized bed and external equipment through a corresponding pipeline.

[0029] In some embodiments, multiple gas inlets may be provided, the cooling gas enters the induction coil 1 through one gas inlet, the target gas enters the fluidized bed through at least one gas inlet, and multiple gas streams are used to ensure uniform gas distribution and improve the fluidization effect. For example, gas inlet 1 and gas inlet 2 may be provided at the bottom of the fluidized bed, and the pipeline outlet ends of gas inlet 1 and gas inlet 2 are different, so as to ensure that the solid particles in different areas of the fluidized bed are in a fluidized state.

[0030] Correspondingly, one or more gas outlets may be provided.

[0031] In some embodiments, the material inlet can be connected to the material barrel 4, and the material outlet can be connected to the user end. The material outlet can adopt different sealing measures, such as L-shaped material sealing or air sealing.

[0032] In the fluidized bed, the solid particles are excited by the flow of the input target gas to form a fluidized state to ensure that the solid particles obtain uniform heat distribution during the heating process. The target gas can be oxygen or an inert gas.

[0033] The induction coil 1 is connected to an external power source. Specifically, the power source can be electricity provided by clean energy such as photovoltaic or wind power. When the induction coil 1 is powered on, the solid particles in the device are heated, and the heated solid particles are discharged through the material outlet for heating at the user end.

[0034] In some embodiments, the power supply end may be connected to the induction coil 1 via a frequency converter.

[0035] Specifically, the induction coil 1 is spirally arranged in the fluidized bed.

[0036] By introducing cooling gas into the induction coil 1, the cooling gas flows in the induction coil 1, which can absorb and conduct heat more quickly and directly, and is particularly suitable for the cooling needs of large-scale high-power coils. In addition, compared with traditional cooling systems, the built-in cooling flow structure is simpler, the system is more compact, and the space occupied by the equipment and the complexity of installation are reduced.

[0037] In some embodiments, the cooling gas may be provided by an external source, such as nitrogen or air.

[0038] In some embodiments, the cooling gas may be the target gas after heat exchange. The specific implementation of this embodiment may be learned below.

[0039] Preferably, insulating particles are filled in the hollow interior of the induction coil 1 to enhance the heat exchange efficiency between the cooling gas and the induction coil 1 .

[0040] In some embodiments, the insulating particles may be ceramic particles or glass beads, etc.

[0041] Preferably, the particle size of the insulating particles is less than 2 cm, which can greatly increase the heat exchange area.

[0042] In this embodiment, the induction coil 1 is a copper induction coil 1 with a relatively low operating temperature.

[0043] In this embodiment, the solid particles are non-conductive materials.

[0044] In some embodiments, the solid particles may be non-conductive materials and / or conductive materials. A heat conductor is designed in the fluidized bed to transfer heat to the solid particles through the heat conductor. The specific implementation of this embodiment can be found below.

[0045] When the solid particles are conductive materials, the outer surface of the induction coil 1 is coated with a high thermal conductivity insulating material. When the solid particles are non-conductive materials, the induction coil 1 may not be processed in any way.

[0046] Therefore, after the induction coil 1 is energized, a magnetic field is generated, the temperature of the induction coil 1 increases, the target gas enters the fluidized bed through the gas inlet, and acts as a fluidizing gas to fluidize the solid particles, thereby improving the heat absorption efficiency of the solid particles in the magnetic field, and the solid particles store heat energy. The fluidizing gas is discharged from the fluidized bed from the gas outlet, and the solid particles after absorbing heat are discharged from the fluidized bed through the material outlet. In this process, the cooling gas flows into the induction coil 1, exchanges heat with the coil and the insulating particles, absorbs the heat generated by the induction coil 1, the temperature of the induction coil 1 decreases, and the temperature of the cooling gas increases. The cooling gas after absorbing heat is discharged from the fluidized bed through the gas outlet opened on the fluidized bed, or the cooling gas after absorbing heat flows out of the induction coil 1 and continues to act as a fluidizing gas, and is transported to the fluidized solid particles in the fluidized bed, and the heat is continued to be transferred to the solid particles, thereby reducing energy loss. Therefore, during high-power electromagnetic induction heating, for copper coils that withstand lower temperatures, the copper induction coil 1 can be quickly and efficiently cooled to prevent overheating and damage, thereby solving the problem of high loss and difficult cooling of high-power copper coils, thereby expanding the potential of copper coils in high-power electromagnetic induction heating applications.

[0047] This embodiment is used to illustrate a specific implementation method in which the cooling gas is the target gas after heat exchange.

[0048] The gas outlet shares a portion of the flow path with the material inlet and is connected to the induction coil 1; It is defined so that: the target gas discharged from the fluidized bed through the gas outlet exchanges heat with the solid particles entering the fluidized bed through the material inlet to preheat the solid particles, and cools itself and enters the induction coil 1 as the cooling gas.

[0049] In this embodiment, the cooling gas and the target gas flowing in the induction coil 1 may be from the same source. Specifically, the target gas in the fluidized bed is discharged through the gas outlet, and continues to flow from the gas outlet through the corresponding pipeline to the induction coil 1. During the flow process, the newly introduced target gas first enters the fluidized bed to act as fluidizing gas, and the temperature in the fluidized bed rises accordingly. The target gas with the increased temperature exchanges heat with the newly introduced cold solid particles to preheat the solid particles, while the temperature of the target gas decreases. The target gas with the reduced temperature continues to enter the induction coil 1 through the gas outlet to act as cooling gas.

[0050] The gas outlet and the material inlet share a portion of the flow path, that is, the material flow and the gas flow share the same portion of space and / or pipeline, so that the two fluids (gas and material) can exchange heat on the same flow path. That is, the cold solid particles entering the fluidized bed through the material inlet will contact the target gas discharged from the fluidized bed and with a higher temperature.

[0051] Exemplarily, the gas outlet and the material inlet are connected through a common pipe (shared by the gas outlet and the material inlet), and the shared pipe is connected to the gas outlet / material inlet opened on the fluidized bed, so that the gas flow flows out of the fluidized bed from the shared pipe at the same time as the material flow enters the fluidized bed from the shared pipe, and the two are in direct contact during the flow process.

[0052] Exemplarily, the gas outlet and the material inlet are connected in a part of the common space through corresponding pipes, the material inlet is connected to the shared space and the fluidized bed through the feed pipe, and the gas outlet is connected to the shared space and the induction coil 1 through the gas outlet pipe, so the gas flow flows through the shared space through the gas outlet pipe, and the material flow flows from the shared space to the fluidized bed through the feed pipe, and heat exchange occurs between the material flow and the gas flow in the shared space. The gas outlet and the material inlet may be on the same side or not.

[0053] Preferably, the shared space is specifically a material barrel 4, which is connected to the material inlet through a feed pipe, and a material valve 5 is provided on the feed pipe. The material barrel 4 is used to store cold solid particles, ensure that an appropriate amount of material is maintained in the fluidized bed, and is connected to the material inlet through the feed pipe so that the solid particles can smoothly enter the fluidized bed. The material barrel 4 can be regarded as a preheater (equivalent to the first heat exchanger), and the target gas with a raised temperature discharged from the gas outlet of the fluidized bed enters the material barrel 4 to heat the cold solid particles, and the cooled gas is sent to the induction coil 1.

[0054] In some embodiments, the gas outlet and the material inlet can be connected through a common pipe and a common space, that is, the gas flow and the material flow flow through the feed pipe and the material barrel 4 at the same time, and are in contact with each other in the material barrel 4 and the feed pipe.

[0055] Therefore, when the induction coil 1 is powered on for heating, the heat generated not only heats the solid particles, but also heats the target gas of the fluidized material. The discharged target gas contacts the incoming cold solid particles and transfers its heat to the solid particles, thereby preheating the cold solid particles and indirectly recovering the heat generated by the induction coil 1, thus avoiding wasting the heat generated by the induction coil 1, and at the same time compensating for the energy required for subsequent heating of the solid particles, thereby improving the energy efficiency of the system. In addition, the target gas after heat recovery also enters the induction coil 1 as a cooling gas, which can effectively reduce the coil temperature without relying on external cooling energy, thereby reducing overall energy consumption. In this way, the gas outlet and the material inlet share part of the flow path to achieve the triple functions of preheating, heat recovery and efficient cooling, optimize the thermal management of the system, improve energy efficiency, and simplify the overall structure. The system can achieve higher economic benefits and thermoelectric conversion performance in practical applications.

[0056] This embodiment is used to illustrate a specific implementation method of designing a heat conductor in a fluidized bed.

[0057] like Figure 1 or Figure 2 As shown, the heat conductor may be a heating element 2. The heating element 2 is located in the fluidized bed and is arranged close to the induction coil 1.

[0058] In this embodiment, the heating element 2 is placed in the fluidized bed, the heat of the induction coil 1 can directly act on the heating element 2, and the solid particles are dispersed around the heating element 2, so the heating element 2 can effectively transfer heat to the solid particles through heat conduction. The solid particles can be not only conductive materials but also non-conductive materials. Therefore, the system design enables it to adapt to different types of solid particles and heating requirements, has strong adaptability, and can select the most suitable solid particles according to specific applications, and can meet the requirements of various industrial applications.

[0059] When the solid particles are conductive materials, the heat from the heating element 2 and the induction coil 1 acts on the solid particles together.

[0060] Specifically, different heating elements 2 can be used according to different use conditions. For example, when an oxidizing atmosphere is used, conductive, wear-resistant and chemically stable materials such as high-temperature alloys and high-temperature resistant austenitic stainless steels with a temperature resistance of 1100°C can be used; when an inert gas such as argon is used, high-temperature resistant, conductive, wear-resistant and chemically stable materials that do not react with argon can be used.

[0061] In this embodiment, the heating element 2 may be in the shape of a strip, a flat shape, a sheet, a round tube, a mesh, a spiral, a sphere or other three-dimensional structures (such as a 3D printed heating element 2). This embodiment does not limit the specific structure of the heating element 2.

[0062] In this embodiment, the heating element 2 can be arranged linearly along one or more directions of the fluidized bed, extended around the central axis of the fluidized bed or along the edge of the fluidized bed, staggered in the fluidized bed, arranged in a ring or circle around the center of the fluidized bed, arranged in different areas of the fluidized bed in a split manner, arranged vertically or obliquely in the fluidized bed, etc. This embodiment does not limit the specific arrangement of the heating element 2.

[0063] In a preferred embodiment, a heat-insulating layer is provided on one side of the heating element 2, which separates but connects the high-temperature zone and the low-temperature zone in the fluidized bed; the material inlet is correspondingly connected to the low-temperature zone, and the induction coil 1 is arranged in the low-temperature zone, so that the solid particles are in contact with the induction coil 1 located in the low-temperature zone, thereby heating the solid particles and cooling the induction coil 1 at the same time.

[0064] Specifically, the fluidized bed can be divided into two layers: a high temperature zone and a low temperature zone; an insulation layer is arranged on one side of the heating element 2, and the insulation layer reduces the conduction of heat, forming a boundary between the high temperature zone and the low temperature zone (adjacent to the induction coil 1), preventing the heat from the high temperature zone from being transferred to the low temperature zone, thereby maintaining the temperature difference between different zones in the fluidized bed.

[0065] Therefore, placing the induction coil 1 in a low temperature area can protect the induction coil 1 from the high temperature inside the device, which helps to reduce the rise in its operating temperature.

[0066] Next, align the material inlet with the low-temperature zone, and the cold solid particles enter the low-temperature zone first. The induction coil 1 can use the cold solid particles to cool the coil (equivalent to the second heat exchanger) through contact with the solid particles, thereby recovering the heat of the coil. After being heated in the low-temperature zone, it enters the high-temperature zone for efficient heating.

[0067] In combination with the above embodiments, before entering the low temperature zone, the cold solid particles first contact with the target gas discharged through the gas outlet to preheat the solid particles, thereby realizing effective recovery and utilization of heat. The preheated solid particles enter the low temperature zone and continue to contact with the induction coil 1, further heating the solid particles while cooling the induction coil 1, further realizing effective recovery and utilization of heat.

[0068] In this way, the induction coil 1 is located in a low temperature zone to ensure the working environment of the induction coil 1. The induction coil 1 is doubly cooled by using preheated solid particles and cooling gas, thereby ensuring the cooling effect of the induction coil 1, which is particularly suitable for the cooling needs of copper coils under high-power use conditions.

[0069] Exemplarily, the heating element 2 is a hollow stainless steel tube with upper and lower openings, the upper opening corresponds to the top of the fluidized bed, and the lower opening corresponds to the bottom of the fluidized bed, dividing the fluidized bed into concentric inner and outer ring areas.

[0070] In some embodiments, the insulation layer is arranged on the inner wall surface of the hollow stainless steel tube, so the induction coil 1 is located in the inner ring area, the inner ring area is used as the low temperature area, and the outer ring area is used as the high temperature area. The material inlet is located at the top of the fluidized bed, correspondingly connected to the inner ring low temperature area, and the material outlet is located at any area of ​​the side wall of the fluidized bed, correspondingly connected to the outer ring high temperature area, and the solid particles that have fully absorbed heat in the high temperature area are discharged.

[0071] In some embodiments, the insulation layer is arranged on the outer wall of the hollow stainless steel tube, so the induction coil 1 is located in the outer ring area, the inner ring area is used as the high temperature area, and the outer ring area is used as the low temperature area. The material inlet is located on the side wall of the fluidized bed, correspondingly connected to the outer ring low temperature area, and the material outlet is located at the bottom of the fluidized bed, correspondingly connected to the inner ring high temperature area, and the solid particles that have fully absorbed heat in the high temperature area are discharged.

[0072] Exemplarily, the heating element 2 may be a plate-like structure, which is horizontally / vertically arranged in the fluidized bed to separate the fluidized bed into a left area and a right area which are adjacent to each other in the horizontal / vertical direction, and a heat-insulating layer and an induction coil 1 are correspondingly arranged.

[0073] In some embodiments, insulation material is arranged inside the heating element 2 (coil side). Different insulation materials can be used according to the temperature in the fluidized bed to prevent heat from the high temperature area from being transferred to the low temperature area, such as ceramic fiber, glass wool or other high temperature insulation materials.

[0074] In some embodiments, the fluidized bed is provided with different gas inlets, and the gas velocities of the two gas streams input from the two gas inlets can ensure that the solid particles in different areas are in a fluidized state, and the gas flow rate in the low-temperature zone ensures that the solid particles can smoothly enter the high-temperature zone from the bottom space of the fluidized bed.

[0075] In some embodiments, the divided area of ​​the high temperature zone may be larger than, equal to, or smaller than the divided area of ​​the low temperature zone.

[0076] In this embodiment, the solid particles can be magnetic / non-magnetic materials, conductive / non-conductive materials. When the thermal insulation layer is designed to separate the fluidized bed into a low-temperature zone and a high-temperature zone, it is preferred to use non-magnetic materials to further reduce the thermal impact on the induction coil 1. The magnetic material is a conductive magnetic material, and the non-magnetic material is a non-conductive magnetic material.

[0077] In summary, the working principle of one embodiment is as follows: (1) Open the material valve 5; (2) The cooling gas from the material barrel 4 is sent to the induction coil 1; (3) When the induction coil 1 is working, a large amount of heat is generated. After the cooling gas absorbs the heat, it is distributed and transported to the high temperature zone and the low temperature zone of the fluidized bed to fluidize the solid particles; (4) The high-temperature gas at the top of the fluidized bed enters the material barrel 4 through a pipeline to preheat the solid particles, and the cooled gas is sent to the induction coil 1.

[0078] In a further technical solution, a distribution plate 3 is provided in the fluidized bed, and the distribution plate 3 is provided above the gas inlet; wherein the distribution plate 3 is separated from or abuts against the heating element 2 .

[0079] In this embodiment, a distribution plate 3 is usually arranged at the bottom of the fluidized bed corresponding to the upper area of ​​the gas inlet to ensure that the gas flow at the gas inlet is evenly distributed throughout the fluidized bed to prevent dead zone phenomenon at the bottom of the fluidized bed.

[0080] When the distribution plate 3 is provided, the heating element 2 is located above the distribution plate 3. The heating element 2 and the distribution plate 3 may have a certain space therebetween or may be in direct contact.

[0081] In some embodiments, the heating element 2 is separated from the distribution plate 3, and the low-temperature zone is located in the inner ring area. The height of the solid particles in the bed layer of the low-temperature zone is greater than the height of the solid particles in the high-temperature zone, so that the solid particles fully contact the induction coil 1 in the low-temperature zone and then enter the high-temperature zone around the gap between the heating element 2 and the distribution plate 3.

[0082] In some embodiments, the heating element 2 is abutted against the distribution plate 3, and the low-temperature zone is located in the outer ring area. The height of the solid particles in the bed layer of the low-temperature zone is just greater than the height of the solid particles in the high-temperature zone. The solid particles in the low-temperature zone enter the high-temperature zone through overflow, and the solid particles in the high-temperature zone are discharged through the built-in discharge pipe.

[0083] Preferably, the heating element 2 is a hollow tubular structure and is disposed in the middle area of ​​the fluidized bed. Therefore, when the solid particles flow from the low temperature area to the high temperature area, they can diffuse in multiple directions from the center to the surroundings, or from the surroundings to the center, thereby effectively utilizing the space of the fluidized bed.

[0084] This embodiment is used to illustrate another specific implementation method of designing a heat conductor in a fluidized bed.

[0085] like Figure 4 As shown, in this embodiment, the heat conductor can be a high magnetic permeability material 6. The high magnetic permeability material 6 is arranged in the fluidized bed, and the high magnetic permeability material 6 can generate heat in the magnetic field generated by the induction coil 1 and quickly transfer the heat to the solid particles.

[0086] Preferably, the high magnetic permeability material 6 can be in granular form and dispersed between a number of solid particles to promote rapid and uniform distribution of heat energy. Therefore, the system is designed to be adaptable to different types of solid particles and heating requirements, has strong adaptability, can select the most suitable solid particles according to specific applications, and can meet the requirements of various industrial applications.

[0087] It is understandable that either the heating element 2 or the high magnetic permeability material 6 can be provided. Alternatively, the heating element 2 and the high magnetic permeability material 6 can be provided at the same time.

[0088] When the solid particles are conductive materials, electromagnetic induction heats the solid particles, as well as the heating element 2 and / or the highly magnetically conductive material 6; When the solid particles are non-conductive materials, electromagnetic induction heats the heating element 2 and / or the high magnetic permeability material 6 .

[0089] The following is a specific example to illustrate this system: Embodiment 1: Please refer again Figure 1 As shown, an electromagnetic induction-based electric heat conversion system includes a gas outlet arranged at the top of the fluidized bed, a gas inlet 1 and a gas inlet 2 at the bottom of the fluidized bed, a material inlet at the top and a material outlet at the side wall, the material inlet is connected to the material barrel 4 through a feed pipe, a material valve 5 is arranged on the feed pipe, and when the material valve 5 is opened, magnetic / non-magnetic solid particles enter the fluidized bed through the material barrel 4; an induction coil 1 which is hollow inside and filled with insulating particles is connected to a power supply end; a heating element 2 is arranged in the fluidized bed and has a certain distance from a distribution plate 3 arranged at the bottom of the fluidized bed; the heating element 2 sets the induction coil 1 inside.

[0090] Embodiment 2: Please refer again Figure 2 As shown, an electromagnetic induction-based electric heat conversion system includes a gas outlet arranged on the side wall of the fluidized bed, a gas inlet 1 and a gas inlet 2 at the bottom of the fluidized bed, a material inlet on the side wall and a material outlet at the bottom, the material inlet is connected to the material barrel 4 through a feed pipe, a material valve 5 is arranged on the feed pipe, and when the material valve 5 is opened, magnetic / non-magnetic solid particles enter the fluidized bed through the material barrel 4; an induction coil 1 which is hollow inside and filled with insulating particles is connected to a power supply end, a heating element 2 is arranged in the fluidized bed and abuts against a distribution plate 3 arranged at the bottom of the fluidized bed; the heating element 2 is surrounded by the induction coil 1.

[0091] Embodiment three: Please refer again Figure 3 As shown, an electromagnetic induction-based electric heat conversion system includes a gas outlet arranged at the top of the fluidized bed, a gas inlet at the bottom of the fluidized bed, a material inlet at the top and a material outlet at the bottom, the material inlet is connected to a material barrel 4 through a feed pipe, a material valve 5 is arranged on the feed pipe, and when the material valve 5 is opened, magnetically conductive solid particles enter the fluidized bed through the material barrel 4; an induction coil 1 which is hollow inside and filled with insulating particles is connected to a power supply end.

[0092] Embodiment 4: Please refer again Figure 4 As shown, an electromagnetic induction-based electric heat conversion system includes a gas outlet arranged at the top of the fluidized bed, a gas inlet at the bottom of the fluidized bed, a material inlet at the top and a material outlet at the bottom, the material inlet is connected to a material barrel 4 through a feed pipe, a material valve 5 is arranged on the feed pipe, and when the material valve 5 is opened, magnetic / non-magnetic solid particles enter the fluidized bed through the material barrel 4; an induction coil 1 which is hollow inside and filled with insulating particles is connected to a power supply end, and a high magnetic permeability material 6 is filled between the solid particles.

[0093] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0094] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the term "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device.

[0095] The above is a detailed introduction to an electromagnetic induction-based electric heat conversion system provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application, and the content of this specification should not be understood as a limitation on the present application. At the same time, for those of ordinary skill in the art, according to the present application, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived from this are still within the scope of protection of the present application.

Claims

1. An electromagnetic induction electrothermal conversion system, characterized in that the system include: A fluidized bed is provided with a gas inlet, a gas outlet, a material inlet and a material outlet, and the fluidized bed is used to place solid particles; An induction coil, which is hollow inside, is disposed in the fluidized bed and is used to be connected to a power supply terminal; Wherein, cooling gas is passed into the induction coil and the induction coil is filled with insulating particles; The induction coil is energized to generate a magnetic field to heat the solid particles, and the target gas is introduced into the fluidized bed to fluidize the solid particles. At the same time, the cooling gas is introduced into the induction coil to exchange heat with the induction coil with the assistance of the insulating particles to cool the induction coil.

2. The electromagnetic induction-based electrothermal conversion system according to claim 1, characterized in that: The gas outlet shares a portion of the flow path with the material inlet and is connected to the induction coil; is defined such that: The target gas in the fluidized bed is discharged through the gas outlet, exchanges heat with the solid particles entering the fluidized bed through the material inlet, preheats the solid particles, and cools itself to enter the induction coil as the cooling gas.

3. The electromagnetic induction-based electrothermal conversion system according to claim 1, characterized in that: The system further includes, located within the fluidized bed: The heating element is arranged in close distance to the induction coil.

4. The electromagnetic induction-based electrothermal conversion system according to claim 3 is characterized in that: A heat-insulating layer is provided on one side of the heating element to divide the fluidized bed into a high-temperature zone and a low-temperature zone; The material inlet is correspondingly connected to the low temperature zone, and the induction coil is arranged in the low temperature zone, so that the solid particles contact the induction coil located in the low temperature zone, heat the solid particles, and cool the induction coil at the same time.

5. The electromagnetic induction-based electrothermal conversion system according to claim 3 is characterized in that: A distribution plate is provided in the fluidized bed, and the distribution plate is provided above the gas inlet; Wherein, the distribution plate is separated from or abuts against the heating element.

6. The electromagnetic induction-based electrothermal conversion system according to claim 3, characterized in that: The heating element is a hollow tubular structure and is arranged in the middle area of ​​the fluidized bed.

7. The electromagnetic induction-based electrothermal conversion system according to claim 1, characterized in that: Magnetic conductive material is arranged in the fluidized bed.

8. The electromagnetic induction-based electrothermal conversion system according to claim 1, characterized in that: The system further comprises: The material cylinder is connected with the material inlet through a feed pipe, and a material valve is arranged on the feed pipe.

9. The electromagnetic induction-based electrothermal conversion system according to claim 1, characterized in that: The induction coil is made of copper.

10. The electromagnetic induction-based electrothermal conversion system according to claim 1, characterized in that: The induction coil is coated with a thermally conductive insulating material.

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