High-efficiency electric heating system suitable for gas-solid fluidized bed

Abstract

The invention provides a high-efficiency electric heating system suitable for a gas-solid fluidized bed, and the system comprises the fluidized bed which is provided with a gas inlet, a gas outlet, a material inlet and a material outlet, and is internally provided with solid particles; the heat transfer assembly comprises a plurality of hollow objects arranged in the fluidized bed, and part of the solid particles are contained in the plurality of hollow objects; wherein at least a first part of the hollow object is used for being connected with a power supply end, and a second part of the hollow object is not electrified; and the first part of the hollow object is a graphite electrifying body. Through the system provided by the invention, the loss of the coil is recovered, and the effective utilization rate of electromagnetic induction heating is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrothermal conversion, and particularly to a high-efficiency electric heating system applicable to a gas-solid fluidized bed. Background Art

[0002] Photovoltaic electricity, wind power, etc. can effectively improve the national energy structure as clean electric powers. However, due to their instability, intermittency and other characteristics, energy storage technologies are required as an intermediate bridge to convert them into stable and controllable energies. As the most mature application, electrothermal conversion technology can consume clean electric powers on a large scale, store them in the form of heat energy, and convert them into electric power or heat energy for output when needed.

[0003] For low-power and small-scale heaters, although resistance heating has the advantages of simple structure and low cost, it is difficult to scale up and has low heat transfer efficiency, so it cannot be applied to large-scale and high-power electric heaters.

[0004] Based on conventional electromagnetic induction technologies such as copper coils, they are limited by the material characteristics of the coils, resulting in a large amount of heat generated by the coils. It is necessary to cool the coils, which in turn leads to a large amount of losses, making the effective utilization rate of electromagnetic induction heating lower than that of resistance heating. Summary of the Invention

[0005] In view of the above problems, the present invention provides a high-efficiency electric heating system applicable to a gas-solid fluidized bed to improve the effective utilization rate of electromagnetic induction heating.

[0006] The present invention provides a high-efficiency electric heating system applicable to a gas-solid fluidized bed, and the technical solution adopted is as follows: A high-efficiency electric heating system applicable to a gas-solid fluidized bed, the system comprising: A fluidized bed provided with a gas inlet, a gas outlet, a material inlet and a material outlet, and solid particles are placed in the fluidized bed; A heat transfer assembly including a plurality of hollow objects disposed in the fluidized bed, and a part of the solid particles are accommodated in the plurality of hollow objects; Wherein, at least a first part of the hollow objects is used to connect to a power supply end, and a second part of the hollow objects is not powered; and the first part of the hollow objects is a graphite energized body.

[0007] As one of the preferred solutions, the second part of the hollow objects can generate heat under the action of a magnetic field.

[0008] As one of the preferred solutions, the hollow objects are configured to restrict and / or allow the flow of the solid particles.

[0009] As one of the preferred solutions, the second part of the hollow objects is arranged in an array around a plurality of graphite energized bodies.

[0010] As one of the preferred solutions, the graphite energized body is a graphite induction tube or a graphite induction coil.

[0011] As one of the preferred solutions, the graphite induction tube is arranged to extend horizontally or vertically.

[0012] As one of the preferred solutions, the hollow object in the second part extends along the flow direction of the solid particles.

[0013] As one of the preferred solutions, diversion grooves are provided on a plurality of the hollow objects.

[0014] As one of the preferred solutions, the solid particles include conductive particles or insulating particles; and in the case of the conductive particles, the wall of the graphite energized body is coated with a thermally insulating material.

[0015] As one of the preferred solutions, the gas outlet shares a partial flow path with the material inlet and is communicated with the graphite energized body.

[0016] Compared with the prior art, the present application has the following advantages: The present invention provides a high-efficiency electric heating system applicable to a gas-solid fluidized bed. The system includes: a fluidized bed provided with a gas inlet, a gas outlet, a material inlet and a material outlet; solid particles are placed in the fluidized bed; a heat transfer assembly including a plurality of hollow objects arranged in the fluidized bed, and a part of the solid particles are accommodated in the plurality of hollow objects; wherein at least a first part of the hollow objects is used to be connected to a power supply end, a second part of the hollow objects is not energized; and the first part of the hollow objects is a graphite energized body.

[0017] In this way, after the graphite energized body is energized, a magnetic field is generated. The graphite energized body has a high use temperature, and the working temperature is higher than that of a traditional copper coil. During the induction heating process, the temperature of the graphite energized body rises, and gas enters the fluidized bed through the gas inlet, so that the solid particles inside and outside each hollow object are in a fluidized state. In this process, the solid particles can be classified into energy storage particles and heat transfer particles according to their uses. The solid particles flow inside and outside each hollow object, improving the heat storage efficiency when serving as energy storage particles to store heat, and improving the heat transfer efficiency when serving as heat transfer particles to transfer heat, comprehensively enhancing the heat transfer efficiency, effectively controlling the temperature of the graphite energized body, and solving the problem of heat loss of the coil, greatly improving the effective utilization rate of electromagnetic induction. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the present application, the accompanying drawings required for the description of the present application will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0019] Figure 1 It is a front view structural schematic diagram of the system when all the hollow objects in the first embodiment of the present application are circular tubes; Figure 2 It is a front view structural schematic diagram of the system when the graphite energized body in the first embodiment of the present application is in the shape of a coil and the graphite heating body is in the shape of a circular tube; Figure 3 It is a front view structural schematic diagram of the system when the graphite heating body is not provided in the first embodiment of the present application; Figure 4 It is a front view structural schematic diagram of the system when the high-permeability magnetic balls are carried on the system in the first embodiment of the present application; Figure 5 It is a front view structural schematic diagram of the system when the graphite energized body is arranged in the outer cavity of the fluidized bed in the first embodiment of the present application; Figure 6 It is another front view structural schematic diagram of the system when all the hollow objects in the first embodiment of the present application are circular tubes.

[0020] Explanation of the reference numerals: 1. Graphite energized body; 2. Graphite heating body; 3. Distribution plate; 4. Material cylinder; 5. Feed pipe. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0022] It should be noted that when a metal workpiece is placed near the induction coil, an 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, heat will be generated by the current, and the metal workpiece will reach the required high temperature in a short time to complete the heating process. Therefore, the efficiency of electromagnetic induction heating is usually high, and it can quickly and uniformly heat large-scale materials or liquids, improving the utilization efficiency of thermal energy.

[0023] Currently, integrating a photovoltaic power generation system or a wind turbine with an electromagnetic induction heating device to utilize the electric energy generated by renewable energy, and then achieving the heating of metal materials or liquids through electromagnetic induction heating technology, further improving the energy efficiency of the entire system, reducing energy loss, while meeting the goal of sustainable development, making it have broad market application potential in fields such as industrial manufacturing, household and commercial heating, agricultural applications, and food processing.

[0024] When performing high-power (>MW) electromagnetic induction heating, the copper coil faces temperature limitations and is easily damaged due to overheating. Therefore, an additional cooling device must be installed to maintain the temperature of the copper coil. However, even if the copper coil is maintained within its specific temperature range, due to the limitation of its operating temperature, it cannot achieve large-scale and high-power heating applications; and due to the existence of additional cooling methods, the heat grade of the recovery coil is low, resulting in low effective utilization rate of electromagnetic induction heating.

[0025] In view of this, referring to Figures 1-6 as shown, Figures 1-6 Different forms of the front view structural schematic diagram of the electromagnetic induction electrothermal conversion system of the present invention are respectively shown. A high-efficiency electric heating system applicable to a gas-solid fluidized bed includes: a fluidized bed provided with a gas inlet, a gas outlet, a material inlet, and a material outlet, and solid particles are placed in the fluidized bed; a heat transfer component including a plurality of hollow objects disposed in the fluidized bed, and a part of the solid particles are accommodated in the plurality of hollow objects; wherein, at least a first part of the hollow objects is used to connect to a power supply end, and a second part of the hollow objects is not energized; and the first part of the hollow objects is a graphite energized body 1.

[0026] Specifically, a gas inlet, a gas outlet, a material inlet, and a material outlet are opened on the fluidized bed housing. The gas inlet is used to input gas, the gas outlet is used to discharge gas, and the flow circulation of the gas is managed. The material inlet is used to input solid particles, and the material outlet is used to output solid particles. It can be known that each inlet and each outlet are connected to the fluidized bed and external equipment through corresponding pipelines.

[0027] In some embodiments, multiple gas inlets can be provided, and gas enters the fluidized bed through at least one gas inlet. Multi-strand airflows are used for air intake to ensure uniform distribution of the gas and improve the fluidization effect. For example, a first gas inlet and a second gas inlet can be provided at the bottom of the fluidized bed to ensure that the solid particles in different regions of the fluidized bed are in a fluidized state. Correspondingly, one or more gas outlets can also be provided.

[0028] In some embodiments, the material inlet can be connected to a material cylinder 4.

[0029] The first part is a hollow object serving as a graphite current-carrying body 1, which is externally connected to a power source. Specifically, the power source can be electricity provided by clean energy such as photovoltaic or wind power. When the graphite current-carrying body 1 is energized, the target heating object in the fluidized bed is heated, and after heating, it is discharged through the corresponding outlet for heating at the user end.

[0030] In some embodiments, the hollow object can be in the shape of a long strip, flat, sheet, circular tube, net, spiral, sphere, or other three-dimensional structures (such as 3D printed parts). The specific structure of the hollow object is not limited in this embodiment.

[0031] In the fluidized bed of this embodiment, the target heating object can be energy storage particles, and the input gas can be used as the fluidizing gas to fluidize the energy storage particles to ensure uniform heat distribution of the energy storage particles during the heating process. The heated energy storage particles are discharged from the material outlet to the user end.

[0032] In the fluidized bed of this embodiment, the target heating object can be a gas, and the input gas serves as both the fluidizing gas and the product gas. The solid particles in the fluidized bed can effectively transfer heat to the gas, and the heated gas is discharged from the gas outlet to the user end.

[0033] In this embodiment, the working temperature of the graphite material is significantly higher than that of the copper material. Therefore, using the graphite current-carrying body 1 as the induction heating object avoids the problem of the low temperature upper limit of the traditional copper coil, making the system more suitable for high-power and large-scale heating scenarios.

[0034] In some embodiments, the second part of the hollow object can generate heat under the action of a magnetic field. This part of the hollow object is not energized, but it can serve as a heat conduction medium, that is, transfer the heat of the high-temperature solid particles and / or high-temperature gas around the graphite current-carrying body 1 to the low-temperature solid particles and / or low-temperature gas. Therefore, the second part of the hollow object can not only transfer heat but also make the heating process more uniform.

[0035] In this embodiment, the second part of the hollow object can be a heating element made of a conductive material, more preferably made of a conductive and magnetic material, and more preferably a graphite heating element 2. Therefore, by placing the graphite heating element 2 in the fluidized bed, the magnetic field of the graphite current-carrying body 1 can directly act on the graphite heating element 2, and the solid particles are dispersed around the graphite heating element 2. Therefore, the graphite heating element 2 can effectively transfer heat to the solid particles through heat conduction. Thus, when the target heating object is solid particles, the solid particles can be made of either a conductive material or a non-conductive material. Therefore, the design of this system enables it to adapt to the heating requirements of different types of solid particles and has strong adaptability.

[0036] More preferably, the graphite heating element 2 is also made of graphite. Therefore, when the graphite energized body 1 is energized, it generates high temperature. Therefore, the graphite heating element 2 is used as a heat transfer object in a high-temperature environment, so that it also has good stability in a high-temperature environment, and is particularly suitable for application in a high-power electromagnetic induction heating system that uses graphite as an electromagnetic induction carrier.

[0037] Specifically, the graphite energized body 1 can be prepared into a hollow circular tube shape, a coil shape, a square tube shape, a narrow plate shape, a sheet shape, etc. Preferably, as Figure 1 and Figure 2 shown, the graphite energized body 1 is prepared into a graphite induction tube or a graphite induction coil. More preferably, the graphite induction tube is arranged to extend horizontally or vertically.

[0038] Specifically, the graphite heating element 2 can also be prepared into a hollow circular tube shape, a spiral shape, a square tube shape, a narrow plate shape, a sheet shape, etc. Preferably, the graphite heating element 2 is prepared into a graphite heating tube. More preferably, the graphite heating tube extends along the flow direction of the solid particles.

[0039] It can be known that in some applications with extremely high power density, although the graphite energized body 1 is resistant to high temperature, it will also generate extremely high heat. If it operates for a long time, it will exceed the ideal working temperature range of graphite. Therefore, in this embodiment, the graphite energized body 1 is designed to be a hollow structure, and at the same time, a non-energized hollow graphite heating element 2 is provided.

[0040] It can be known that the graphite energized body 1 directly heats the solid particles and the graphite heating element 2 due to electromagnetic induction, or the graphite energized body 1 generates heat due to energization and transfers the heat to the solid particles, the surrounding gas and the graphite heating element 2, while the graphite heating element 2 continues to transfer the heat to the flowing gas and the surrounding solid particles. Among them, the solid particles flow around the inside and outside of each hollow object in the fluidized bed, so they can be used as energy storage particles to store heat, or as heat transfer particles to transfer heat, or part of them as energy storage particles and the other part as heat transfer particles to store energy and transfer heat simultaneously.

[0041] As a specific explanation of this embodiment, the following provides several functional options for the solid particles: In the following embodiments, for the sake of easy understanding, the graphite energized body 1 is a graphite electromagnetic induction tube, and the graphite heating element 2 is a graphite heating tube for specific description.

[0042] Exemplarily, in the first scheme: When the target heating object is a gas, all the solid particles are heat transfer particles at this time. The heat transfer particles are used to transfer heat and are preferably insulating materials. When the gas enters the fluidized bed, a part of the gas and a part of the insulating solid particles flow outside each hollow object (graphite induction tube, graphite heating tube), and another part of the air and another part of the insulating solid particles flow inside each hollow object. Since the gas flows inside and outside the hollow object, it can directly exchange heat with the tube wall and the solid particles, greatly increasing the heat exchange area between the gas and the solid. While making the temperature of the hollow object controllable, the heat of the hollow object is effectively transferred to the gas, greatly improving the heat exchange efficiency.

[0043] Exemplarily, in the second solution: When the target heating object is solid particles, all the solid particles can be energy storage particles at this time. The energy storage particles are used to store heat and are preferably electrically conductive and magnetically conductive solid particles. When the gas enters the fluidized bed, a part of the gas and a part of the magnetic solid particles flow outside each hollow object (graphite induction tube, graphite heating tube), and another part of the air and another part of the magnetic solid particles flow inside each hollow object. On the one hand, the magnetic field generated by the energized graphite induction tube makes the magnetic solid particles generate heat; on the other hand, since the magnetic solid particles flow inside and outside the hollow object, the heat generated by the graphite induction tube and the heat of the graphite heating tube are directly transferred to the magnetic solid particles, improving the heat storage efficiency of the magnetic solid particles and cooling the graphite induction tube at the same time. In this example, insulating materials are coated inside and outside the graphite induction tube.

[0044] Exemplarily, in the third solution: When the target heating object is solid particles, all the solid particles can be insulating solid particles at this time. When the gas enters the fluidized bed, a part of the gas and a part of the insulating solid particles flow outside each hollow object (graphite induction tube, graphite heating tube), and another part of the air and another part of the insulating solid particles flow inside each hollow object. The graphite heating tube generates heat in the magnetic field generated by the graphite induction tube. Since the insulating solid particles flow inside and outside the graphite heating tube and the graphite induction tube, the heat of the graphite heating tube and the graphite induction tube is directly transferred to the insulating solid particles, thereby heating the insulating solid particles. At the same time, the insulating solid particles enhance the heat exchange between the graphite induction tube and the gas, effectively taking away the heat generated by the graphite induction tube. In this example, the wall surface of the graphite induction tube is not insulated.

[0045] Exemplarily, in the fourth solution: When the target heating object is solid particles, the solid particles can be a combination of energy storage particles and insulating particles at this time. The insulating particles are located inside the graphite energized body 1, and the energy storage particles are located inside and outside the graphite heating tube and outside the graphite induction tube; the gas in the fluidized bed can pass through the inside and outside of the graphite induction tube and the graphite heating tube. On the one hand, since the energy storage particles flow inside and outside the graphite heating tube, the heat generated by the graphite heating tube in the magnetic field is directly transferred to the energy storage particles. At the same time, the graphite induction tube is energized to generate heat to heat the insulating particles inside the tube, the energy storage particles outside the tube, and the gas; the insulating particles enhance the heat exchange between the graphite induction tube and the gas and effectively take away the heat generated by the graphite induction tube.

[0046] In summary, when the energy storage particles are conductive particles prepared from a conductive material, the outer surface of the graphite induction tube is coated with a thermally conductive insulating material. When the energy storage particles are insulating particles prepared from a non-conductive material, the graphite induction tube can be left untreated. Among them, the thermally conductive insulating material is preferably a highly thermally conductive insulating material, more preferably magnesium oxide, alumina ceramics, etc.

[0047] It can be understood that the graphite induction tube is placed inside the fluidized bed, and the presence of a thermal resistance due to the outer covering of the high-temperature resistant insulating material will hinder the heat transfer of the graphite induction tube to the external solid particles. Therefore, in this embodiment, it is a hollow graphite tube with solid particles filled inside, so that the heat inside the tube can be directly transferred to the solid particles and the gas, and the temperature inside and outside the tube can be prevented from being too high.

[0048] Combined with the above embodiments, the hollow object is configured to restrict and / or allow the flow of the solid particles.

[0049] Specifically, inside the fluidized bed, the hollow object can adjust the flow of the solid particles through different structural designs, thereby affecting the heating efficiency, the material temperature distribution, and the gas flow path.

[0050] For example, the solid particles inside all the hollow objects do not flow. In this design method, it can be designed according to the first scheme, and all the solid particles are used as heat transfer particles. Therefore, in the first scheme, a part of the solid particles are fixed inside the tube, and the other part flows outside the tube. When the air flows through the tube, it can pass through the solid particles, enhancing the heat exchange between the heat generated by the hollow object and the gas.

[0051] Also, for example, the solid particles inside all the hollow objects can flow. In this design method, it can be designed according to the first scheme, the second scheme, and the third scheme, and all the solid particles are used as heat transfer particles or energy storage particles alone. Therefore, in these three schemes, all the solid particles flow inside and outside the tube, and the solid particles are mixed with the flowing air, and both as heat transfer particles or energy storage particles can further enhance the heat transfer effect with the hollow object.

[0052] For another example, the solid particles in the graphite induction tube do not flow, while the solid particles in the graphite heating tube can flow. In this design method, it can be designed according to the fourth scheme. In this scheme, part of the solid particles are fixed as insulating particles in the graphite induction tube to enhance heat exchange, and the remaining solid particles are used as energy storage particles to flow inside and outside the graphite induction tube and inside the graphite heating tube. Therefore, the insulating particles and the energy storage particles will not be mixed.

[0053] Preferably, in the fifth scheme: The insulating solid particles in the graphite induction tube do not flow, and the conductive solid particles flow outside the graphite induction tube and inside and outside the graphite heating tube, and a thermally conductive insulating material is coated on the outer surface of the graphite induction tube. Therefore, when the graphite induction tube is energized to generate a magnetic field, it directly heats the conductive solid particles and the graphite heating tube, and the conductive solid particles do not generate current interference with the energized graphite induction tube. The graphite heating tube simultaneously transfers heat to the fluidized conductive solid particles. The insulating solid particles enhance the heat exchange between the heat generated by the graphite induction tube and the gas. At the same time, the insulating solid particles for optimizing heat transfer and the conductive solid particles for energy storage play their respective roles in relatively independent spaces.

[0054] Among them, the movable accommodating structure can be set as a hollow structure with both ends open and hollow inside.

[0055] Correspondingly, the fixed accommodating structure can be set such that the opening of the hollow object is smaller than the inner diameter of the solid particles; or a sealing plate with pores is arranged at the openings at both ends of the hollow object.

[0056] In some embodiments, the length of the hollow object can be adjusted according to actual needs.

[0057] Therefore, the flowing solid particles continuously contact the heat source (such as the hollow object), enhancing heat exchange, helping to absorb or transfer heat more effectively. Through the flow of the particles, a more uniform temperature distribution is provided for the fluidized bed. In addition, compared with the traditional cooling system, the built-in cooling flow structure is simpler, the system is more compact, reducing the equipment occupancy space and installation complexity.

[0058] Preferably, a plurality of graphite heating tube arrays are arranged around a plurality of graphite induction tubes. In this embodiment, a plurality of graphite induction tubes and a plurality of graphite heating tubes are provided to improve the thermal efficiency of the electromagnetic induction heating system. And the heat transfer hollow object is arranged around the graphite induction tube, so that the heat generated by the graphite induction tube can be more evenly distributed to the entire fluidized bed area.

[0059] As Figure 1 shown, in some embodiments, the graphite heating tubes are arranged in a circle, and the graphite induction tubes are arranged in a circle. And at least one circle of graphite heating tubes are respectively arranged on the radial outer side and the radial inner side of at least one circle of graphite induction tubes.

[0060] In some embodiments, the number of graphite heating tubes is greater than, less than, or equal to the number of graphite induction tubes.

[0061] As Figure 3 shown, in some embodiments, the number of graphite heating tubes that are not energized in the second part can be zero, and at this time, the solid particles are magnetic solid particles.

[0062] As Figure 4 shown, in some embodiments, high-permeability magnetic spheres can be provided on a plurality of graphite heating bodies 2. The high-permeability magnetic spheres can generate heat in the magnetic field generated by the induction coil and quickly transfer the heat to the solid particles.

[0063] As Figure 5 shown, in some embodiments, the graphite energized body 1 can be located outside the fluidized bed and electrically heat the solid particles inside the fluidized bed.

[0064] As Figure 6 shown, in some embodiments, the graphite induction tubes are arranged in series. And the graphite induction tubes are uniformly arranged around the fluidization tank at intervals along the height direction of the fluidized bed, and the graphite heating tubes are located between the graphite induction tubes and in the middle area of the fluidized bed.

[0065] Among them, by controlling the arrangement, number, size, and air flow velocity of the hollow objects, the air flow distribution inside the fluidized bed can be optimized, and specific limitations are not made in this embodiment.

[0066] More preferably, diversion grooves are provided on a plurality of the hollow objects. Combining the above embodiments, when the solid particles flow inside and outside the corresponding hollow objects, the arrangement of the diversion grooves can guide the flow direction and speed of the gas mixture carrying the solid particles, guide the air flow to make more sufficient contact with the solid particles, and at the same time enable the gas mixture to pass through each hollow object more smoothly and uniformly.

[0067] In this embodiment, the hollow objects are vertically arranged in the fluidized bed, and the diversion grooves extend along the height direction of the hollow objects and are in the same direction as the gas flow direction.

[0068] In some embodiments, the diversion grooves can be linear diversion grooves, curved diversion grooves, spiral diversion grooves, multi-segment distributed diversion grooves, gradient diversion grooves, trumpet-shaped diversion grooves, and wave-shaped diversion grooves, etc.

[0069] In a further technical solution, a distribution plate 3 is provided in the fluidized bed, and the distribution plate 3 is arranged above the gas inlet. In this embodiment, the distribution plate 3 is usually arranged in the area above the gas inlet corresponding to the bottom of the fluidized bed to ensure that the air flow at the gas inlet is evenly distributed throughout the fluidized bed and prevent the occurrence of dead zones at the bottom of the fluidized bed.

[0070] In another embodiment, when the target heating object is solid particles and the gas only serves as the fluidizing gas, the system further includes a material cylinder 4, which is connected to the material inlet through a feed pipe 5, and a material valve is provided on the feed pipe 5. A material outlet is also provided on the fluidized bed, and the gas outlet shares a part of the flow path with the material inlet and is connected to the graphite induction tube.

[0071] In this embodiment, the material outlet is connected to the user end. Different sealing measures can be adopted for the material outlet, such as L-type material seal or air seal. The gas can be from an external source.

[0072] The gas outlet shares a part of the flow path with the material inlet and is connected to the graphite induction tube; it is defined such that: the gas discharged from the fluidized bed through the gas outlet exchanges heat with the solid particles entering the fluidized bed through the material inlet, preheating the solid particles, and at the same time cooling itself and entering the graphite induction tube as the cooling gas.

[0073] In this embodiment, the gas flowing in the graphite induction tube serves as the cooling gas. Specifically, the gas discharged from the fluidized bed through the gas outlet continues to flow from this gas outlet through the corresponding pipe to the graphite induction tube. During the flow process, the newly introduced gas first enters the fluidized bed to act as the fluidizing gas, and the temperature in the fluidized bed rises accordingly. The gas with the increased temperature exchanges heat with the newly introduced cold solid particles, preheating the solid particles, and at the same time the temperature of the gas decreases. The gas with the decreased temperature continues to enter the graphite induction tube through the gas outlet to act as the cooling gas.

[0074] It is set that the gas outlet shares a part of the flow path with the material inlet, that is to say, the material flow and the gas flow share the same part of the space and / or pipe, so that the two fluids (gas and material) can exchange heat on the same flow path. That is, the cold energy storage particles entering the fluidized bed through the material inlet will contact the gas discharged from the fluidized bed and with an increased temperature.

[0075] Exemplarily, the gas outlet and the material inlet are connected through a common pipe (the gas outlet and the material inlet share), and the shared pipe is connected to the gas outlet / material inlet provided on the fluidized bed. Therefore, while the gas flow flows out of the fluidized bed from this shared pipe, the material flow enters the fluidized bed from this shared pipe, and the two directly contact during the flow process.

[0076] Exemplarily, the gas outlet and the material inlet are respectively connected through corresponding pipelines in a part of the common space. The material inlet is respectively connected to the shared space and the fluidized bed through the feed pipeline 5, and the gas outlet is respectively connected to the shared space and the graphite induction tube through the gas outlet pipeline. Therefore, the gas flow passes through the shared space through the gas outlet pipeline, and the material flow flows from the shared space into the fluidized bed through the feed pipeline 5. Heat exchange occurs between the material flow and the gas flow in the shared space. Among them, the gas outlet and the material inlet can be on the same side or not on the same side.

[0077] Preferably, the shared space is specifically the material cylinder 4. The material cylinder 4 is connected to the material inlet through the feed pipeline 5, and a material valve is provided on the feed pipeline 5. The material cylinder 4 is used to store cold energy storage particles to ensure an appropriate amount of material in the fluidized bed. It is connected to the material inlet through the feed pipeline 5, enabling solid particles to smoothly enter the fluidized bed. The material cylinder 4 can be regarded as a preheater. The gas with an increased temperature discharged from the gas outlet of the fluidized bed enters the material cylinder 4 to heat the cold energy storage particles, and the cooled gas is sent to the graphite induction tube.

[0078] In some embodiments, the gas outlet and the material inlet can be connected through a section of common pipeline and a part of the common space. That is, the gas flow and the material flow flow through the feed pipeline 5 and the material cylinder 4 at the same time and are in contact within both the material cylinder 4 and the feed pipeline 5.

[0079] Therefore, when the graphite induction tube is energized and heated, the generated heat not only heats the solid particles but also heats the gas for fluidizing the material. The discharged gas contacts the incoming cold energy storage particles and transfers its heat to the solid particles, thereby preheating the cold solid particles and recovering the heat generated by the graphite induction tube, improving the energy efficiency of the system. In addition, the gas after recovering the heat also enters the graphite induction tube as a cooling gas, which can effectively reduce the temperature inside the tube, eliminating the need to rely on an external cooling system and reducing the overall energy consumption. In this way, the gas outlet and the material inlet sharing part of the flow path achieve the triple functions of preheating, heat recovery, and efficient cooling, optimizing the thermal management of the system, improving the energy efficiency, and simplifying the overall structure. This system can achieve higher economic benefits and thermoelectric conversion performance in practical applications.

[0080] The following provides specific examples for a specific description of this system: Example 1: Please refer to again Figure 1As shown in the figure, a high-efficiency electric heating system applicable to a gas-solid fluidized bed, the system includes a gas outlet provided 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 cylinder 4 through a feed pipe 5, and a material valve is provided on the feed pipe 5. The gas outlet is connected to the material inlet through a pipe. When the material valve is opened, the energy storage particles enter the fluidized bed through the material cylinder 4; a plurality of graphite induction tubes are arranged in the fluidized bed and connected to a power supply terminal, and a plurality of graphite heating tubes are arranged in the fluidized bed and arrayed around the plurality of graphite induction tubes. The energy storage particles flow inside and outside the graphite heating element 2 and the graphite induction tubes.

[0081] Embodiment 2: Please refer to again Figure 2 As shown in the figure, a high-efficiency electric heating system applicable to a gas-solid fluidized bed, the system includes a gas outlet provided 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 cylinder 4 through a feed pipe 5, and a material valve is provided on the feed pipe 5. The gas outlet is connected to the material inlet through a pipe. When the material valve is opened, the energy storage particles enter the fluidized bed through the material cylinder 4; a graphite induction coil is arranged in the fluidized bed and connected to a power supply terminal, and a plurality of graphite heating tubes are arranged in the fluidized bed and arranged around the graphite induction coil. The energy storage particles flow inside and outside the graphite heating element 2 and the graphite induction tubes.

[0082] Embodiment 3: Please refer to again Figure 3 As shown in the figure, different from Embodiment 2, when the energy storage particles are conductive materials, the graphite heating tubes may not be provided.

[0083] Embodiment 4: Please refer to again Figure 4 As shown in the figure, different from Embodiment 2, high-permeability magnetic balls are provided on the graphite heating tubes.

[0084] Embodiment 5: Please refer to again Figure 5 As shown in the figure, different from Embodiment 2, a first gas inlet and a second gas inlet are provided, and the graphite induction coil is arranged outside the fluidized bed.

[0085] It should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0086] It should also be noted that in this text, the orientation or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. This 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. Therefore, it should not be construed as a limitation to the present invention. In addition, relative 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 any such actual relationship or order between these entities or operations, nor can they be construed as indicating or implying relative importance. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or terminal device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or terminal device.

[0087] The above has introduced in detail a high-efficiency electric heating system applicable to a gas-solid fluidized bed provided by the present application. Specific examples are used in this text to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only for helping to understand the present application, and the content of this specification should not be construed as a limitation to the present application. At the same time, for those of ordinary skill in the art, based on the present application, there will be various forms of changes in the specific implementation manner and application scope. It is not necessary and impossible to enumerate all the implementation manners here, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A high-efficiency electric heating system applicable to a gas-solid fluidized bed, characterized in that the system Comprising: A fluidized bed, provided with a gas inlet, a gas outlet, a material inlet and a material outlet, and solid particles are placed in the fluidized bed; A heat transfer component, including a plurality of hollow objects arranged in the fluidized bed, and a part of the solid particles are accommodated in the plurality of hollow objects; Wherein, at least a first part of the hollow objects is used to be connected to a power supply end, and a second part of the hollow objects is not energized; and the first part of the hollow objects is a graphite energized body.

2. The high-efficiency electric heating system applicable to a gas-solid fluidized bed according to claim 1, wherein The second part of the hollow objects can generate heat under the action of a magnetic field.

3. An efficient electric heating system applicable to a gas-solid fluidized bed according to claim 1, characterized in that, The hollow objects are configured to restrict and / or allow the flow of the solid particles.

4. A high-efficiency electric heating system applicable to a gas-solid fluidized bed according to claim 2, characterized in that, The second part of the hollow object array is arranged around a plurality of graphite energized bodies.

5. The high-efficiency electric heating system applicable to a gas-solid fluidized bed according to claim 1, characterized in that, The graphite energized body is a graphite induction tube or a graphite induction coil.

6. The high-efficiency electric heating system applicable to a gas-solid fluidized bed according to claim 5, wherein The graphite induction tube is arranged to extend horizontally or vertically.

7. An efficient electric heating system applicable to a gas-solid fluidized bed according to claim 2, characterized in that, The second part of the hollow objects extends along the flow direction of the solid particles.

8. An efficient electric heating system applicable to a gas-solid fluidized bed according to claim 1, characterized in that, A diversion groove is arranged on the plurality of hollow objects.

9. The high-efficiency electric heating system applicable to a gas-solid fluidized bed according to claim 1, characterized in that The solid particles include conductive particles or insulating particles; and in the case of the conductive particles, the wall surface of the graphite energized body is coated with a thermally insulating material.

10. A high-efficiency electric heating system applicable to a gas-solid fluidized bed according to claim 1, characterized in that, The gas outlet shares a part of the flow path with the material inlet and is communicated with the graphite energized body.

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