Device for heating high-temperature particles through electromagnetic induction
By designing an electromagnetic induction heating high-temperature particle device, the accumulation of induction heated particles is used to form a porous flow channel, high-temperature heating and storage are achieved, and the problems of insufficient heating depth and large temperature gradient in the prior art are solved, and heating efficiency and safety are improved.
Patent Information
- Application Number
- CN202510053040.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-02-28
AI Technical Summary
The existing electromagnetic induction heating technology has problems such as shallow heating depth, large temperature gradient, and inability to be suitable for heating fluids in large flow sections in the field of high temperatures.
An electromagnetic induction heating device is designed to form a porous flow channel by stacking induction heating particles, heating the induction heating particles with alternating magnetic fields, and heating the ceramic particles through convection and radiation heat exchange to achieve high-temperature storage.
The uniformity of heating temperature is achieved, the heat exchange area with ceramic particles is expanded, the heat exchange ability of ceramic particles is improved, and the skin effect and physical isolation of heat sources and heat exchange fluids in traditional electromagnetic induction heating technology are overcome, which improves safety and service life.
Smart Images
Figure CN119545588A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of electric heating, and in particular to a device for heating high-temperature particles with electromagnetic induction. Background Art
[0002] In recent years, renewable energy power represented by wind power and solar power has risen rapidly, and the proportion of installed capacity has increased year by year. It is estimated that the installed capacity of wind power and solar power will exceed 1.8 billion kW in 2030, and the installed capacity of wind and solar power will exceed 6 billion in 2060, accounting for more than 70% of the power generation. At the same time, the electrification rate in terminal energy consumption will also increase year by year, and it is imperative to develop advanced and efficient electric heating technology to meet various needs. In addition, large amounts of unstable new energy power also bring great challenges to the stability of power grid operation. In order to make full use of abandoned wind and solar power and off-peak electricity, it is imperative to develop efficient electric heating and heat storage technology.
[0003] At present, the main electric heating methods include resistive heating and inductive heating. Resistive heating is a method of heating by using the thermal effect of electric current passing through a resistor. It realizes the heating process through the Joule heating effect. The heated object and the electric heating element need to be in direct contact for heat exchange. It is widely used for heating liquids with good fluidity, but for solids with poor thermal conductivity, there are problems such as the resistance element is easy to burn out at high temperature and low reliability. Electromagnetic induction heating has the characteristics of indirect heating, easy control of heating temperature, and fast hot start. It is an electric heating technology that has developed rapidly in recent years. It relies on eddy current heating to quickly achieve the purpose of heating by placing the induction heated object in an alternating magnetic field. The heat source and the power supply are physically separated, with high heating efficiency and high safety. Ceramic particles have the advantages of a wide operating temperature range, stable physical and chemical properties, low price, and can be used as medium and high temperature heat exchange, heat storage medium, and high heat storage density. At present, electromagnetic induction heating fluid particles mainly heat the particles in the tube by heating the tube wall, but due to the skin effect of electromagnetic induction, the heating depth is shallow and the radial temperature gradient in the tube is large. This method cannot be applied to scenes such as heating fluids with large flow sections. Summary of the invention
[0004] In order to solve the above technical problems, the purpose of the present invention is to overcome the shortcomings of the existing electric heating heat storage technology in the high temperature field, and provide an electromagnetic induction heating high temperature particle device. It includes an electromagnetic induction heating controller, an induction heating coil, a feeding port, ceramic particles, induction heated particles or induction heated porous media, anti-magnetic tubes, thermal insulation materials, support screens, collection sections, temperature sensors, flow control valves, heat storage tanks, and data acquisition control systems. The induction heated particles are filled in the anti-magnetic tube and accumulated to form pores, which provide flow channels for the ceramic particles to flow. The outer wall of the anti-magnetic tube is wrapped with thermal insulation material, and an electromagnetic induction heating coil is wrapped around the thermal insulation material. The electromagnetic induction heating coil is energized to generate an alternating magnetic field, which heats the induction heated particles through the thermal insulation material and the anti-magnetic tube. The ceramic particles flow through the porous flow channel driven by their own gravity, and conduct convection and radiation heat exchange with the induction heated particle group to realize the heating process. The induction heated particle heating and ceramic particle heat exchange processes are both completed in the anti-magnetic tube section, and the device structure is compact.
[0005] The specific technical solution is: an electromagnetic induction heating device for high-temperature particles, which includes an induction heating coil, ceramic particles, induction heated particles, a diamagnetic tube, and a thermal insulation material; wherein the diamagnetic tube is circumferential, a thermal insulation material is arranged outside the diamagnetic tube, the outer wall of the thermal insulation material is wrapped with the induction heating coil, the induction heated particles are accumulated and filled in the diamagnetic tube, and a porous flow channel is formed, the electromagnetic induction coil generates an alternating magnetic field, and the induction heated particles are heated at high temperature through the diamagnetic tube, the ceramic particles flow through the porous flow channel by their own gravity, and are heated, and the heating of the induction heated particles and the heat exchange process of the ceramic particles are completed in the diamagnetic tube section. In the electromagnetic induction heating device for high-temperature particles, multiple diamagnetic tubes can be connected in parallel through electromagnetic induction heating coils to increase the heating power demand.
[0006] The device of the present invention has the following advantages:
[0007] The electromagnetic induction heating device for high-temperature particles performs induction heating in the form of accumulation of induction heated particles, so that the heating temperature is more uniform, and the phenomenon of concentrated high temperature caused by the skin effect of the traditional electromagnetic induction heating tube wall is overcome; the spherical shape of the induction heated particles has a large specific surface area, which greatly expands the heat exchange area with the ceramic particles, overcomes the deficiency of poor heat exchange capacity of the ceramic particles, and reduces the temperature difference between the heat source and the heat exchange fluid; the induction heated particle heating and the ceramic particle heat exchange process are both completed in the anti-magnetic tube section, and the device structure is compact; the ceramic particles are physically isolated from the power supply heating end, and there is no problem of heating elements burning due to high temperature in resistance heating, and the heating process is highly safe and has a long service life; high-temperature resistant, low-cost, and wear-resistant ceramic particles are used as heat exchange and heat storage media to increase the heating temperature and heat storage density per unit volume; wind and solar non-stable power, wind and solar abandoned power, etc. can be used for high-temperature heat storage, which can be used for thermal power generation, steam or hot water production, and reduce energy costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 It is a schematic diagram of the electromagnetic induction heating high temperature particle device in the form of induction heated particle accumulation of the present invention;
[0009] Figure 2 It is a schematic diagram of the AA section of the electromagnetic induction heating high temperature particle device in the form of induction heated particle accumulation of the present invention;
[0010] Figure 3 A schematic diagram of a porous medium-type electromagnetic induction heating device for high-temperature particles according to the present invention;
[0011] Figure 4 It is a schematic cross-sectional view BB of the electromagnetic induction heating high-temperature particle device in the form of a porous medium of the present invention.
[0012] In the figure: power supply 1; electromagnetic induction heating controller 2; induction heating coil 3; feed port 4; ceramic particles 5; induction heated particles 6; anti-magnetic tube 7; thermal insulation material 8; support screen 9; collection section 10; temperature sensor 11; flow regulating valve 12; heat storage tank 13; data acquisition control system 14; porous medium 15. DETAILED DESCRIPTION
[0013] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other. To achieve the above-mentioned purpose, the present invention adopts the following technical scheme.
[0014] Embodiment 1 of the present invention Figure 1 and Figure 2 As shown, Figure 1 The figure shows a schematic diagram of an electromagnetic induction heating high temperature particle device in the form of induction heated particle accumulation. Figure 2AA is a schematic diagram of the device. The device includes a power supply 1, an electromagnetic induction heating controller 2, an induction heating coil 3, a feed port 4, ceramic particles 5, induction heated particles 6, a diamagnetic tube 7, a heat preservation material 8, a support screen 9, a collection section 10, a temperature sensor 11, a flow regulating valve 12, a heat storage tank 13, and a data acquisition control system 14. The induction heated particles 6 are freely stacked and filled inside the diamagnetic tube 7, and are always in a static state. The outer wall of the diamagnetic tube 7 is wrapped with a heat preservation material 8, and the outer wall of the heat preservation material 8 is wrapped with an induction heating coil 3, and the induction heating coil 3 is connected to the electromagnetic induction heating controller 2. Multiple electromagnetic induction heating coils 3 are connected in parallel to increase the heating power demand; the electromagnetic induction heating controller 2 can have an operating frequency of industrial frequency, medium frequency or high frequency; the induction heated particles 6 are stacked to form porous gaps to provide channels for the flow of ceramic particles 5. The induction heated particles 6 are spherical in shape, and are made of iron-based, nickel-based or cobalt-based ferromagnetic materials or graphite, and the particle diameter ranges from 5 to 30 mm. The ceramic particles are quartz sand, the main material is alumina, with a temperature resistance of 1300°C, good wear resistance and pressure resistance, and a particle size range of 300-500um. The insulation material 8 insulates the induction heated particles 6 and ceramic particles 5 in the anti-magnetic tube 7, and also insulates the induction heating coil 3 to prevent the heat of the particles placed inside from being transferred out, causing the temperature of the induction heating coil 3 to be too high. The anti-magnetic tube 7 is circular, and the material can be a quartz tube, a glass fiber reinforced plastic tube, or a non-magnetic and conductive material. The supporting screen 9 is located at the lower end of the anti-magnetic tube 7. The screen pores are smaller than the diameter of the induction heated particles 6 and larger than the diameter of the ceramic particles 5, which plays a role in blocking the induction heated particles 6 and passing through the ceramic particles 5. The collecting section 10 is funnel-shaped and is provided with a temperature sensor 11. The discharge port is provided with a flow regulating valve 12, which plays a role in flow control. The heat storage tank 13 has an insulation layer to collect and insulate the high-temperature particles. The data acquisition control system 14 can change the electric power of the electromagnetic induction heating controller 2 and the opening of the flow regulating valve 12 .
[0015] The induction heated particles 6 are spherical in shape, made of iron-based, nickel-based or cobalt-based ferromagnetic materials or graphite, are always in a static state, have a diameter range of 5-30 mm, and are deposited in a free-stacked state.
[0016] The data acquisition control system 14, the temperature sensor 11, the flow control valve 12, and the power supply 1 have a linkage function. The opening of the flow control valve 12 and the heating power of the power supply 1 can be dynamically adjusted according to the temperature monitoring of the temperature sensor 11 to achieve the required outlet temperature.
[0017] The heating process is as follows: turn on the power supply 1, the induction heating controller 2 generates an alternating current, and the high-speed changing current flows through the induction heating coil 3 to generate an alternating magnetic field. Under the action of the alternating magnetic field, the induction heated particles 6 cut the alternating magnetic lines to generate an alternating current, i.e., an eddy current, and then the eddy current causes the carriers of the induction heated particles 6 to move irregularly at high speed, and the carriers collide and rub with each other to generate heat energy, and the induction heated particles are heated. The induction heated particles 6 are freely accumulated to form a particle group, forming many porous gaps, and the magnetic field can heat the internal induction heated particles 6 through these pores, so as to achieve the purpose of uniformly heating the induction heated particles 6, and avoid the lack of concentrated local high-temperature heating around the outer wall caused by the skin effect. The ceramic particles 5 are injected into the feed port 4, and driven by their own gravity, they flow into the porous flow channel formed by the accumulation of the induction heated particles 6, and conduct convection and radiation heat exchange with the induction heated particles 6, thereby being heated, and then flow into the collection section 10 through the support partition 9, and finally flow into the heat storage tank 13 for high-temperature storage. The electromagnetic induction heating controller 2, the temperature sensor 11, and the flow regulating valve 12 are integrated in the data acquisition control system 14. The outlet temperature measured by the temperature sensor 11 can be set and adjusted according to the input power of the electromagnetic induction heating controller 2 and the opening of the flow regulating valve 12 to achieve the required ceramic particle outlet temperature.
[0018] Embodiment 2 of the present invention Figure 3 and Figure 4 and as shown, Figure 3 This is a schematic diagram of a porous medium electromagnetic induction heating device for high-temperature particles. Figure 4 BB is a schematic diagram of the cross section of the device. Here, the induction heated particles 6 in Example 1 are replaced with porous media 15, which are filled inside the anti-magnetic tube 7. The porous media 15 is made of ferromagnetic material containing iron, nickel, and cobalt elements or graphite, with a porosity higher than 90%, and a pore diameter larger than the particle size of the ceramic particles 6. The other structures are the same as those in Example 1.
[0019] The porous medium 15 is made of ferromagnetic material containing iron, nickel or cobalt or graphite, with a porosity higher than 90%, a pore diameter larger than that of ceramic particles, and the pores can be uniform or non-uniform.
[0020] The heating process is as follows: turn on the power supply 1, the induction heating controller 2 generates an alternating current, and the high-speed changing current flows through the induction heating coil 3 to generate an alternating magnetic field. Under the action of the alternating magnetic field, the porous medium 15 cuts the alternating magnetic lines to generate an alternating current, i.e., an eddy current, and then the eddy current causes the carriers of the porous medium 15 to move irregularly at high speed, and the carriers collide and rub with each other to generate heat energy, and the porous medium 15 is heated. The ceramic particles 5 are injected into the feed port 4, and driven by their own gravity, flow into the porous medium 15, and conduct convection and radiation heat exchange in the porous flow channel inside it, thereby being heated, and then flow into the collection section 10 through the support partition 9, and finally flow into the heat storage tank 13 for high-temperature storage. The electromagnetic induction heating controller 2, the temperature sensor 11, and the flow control valve 12 are integrated in the data acquisition control system 14. The outlet temperature measured by the temperature sensor 11 can be set and adjusted according to the input power of the electromagnetic induction heating controller 2 and the opening of the flow control valve 12 to achieve the required ceramic particle outlet temperature.
Claims
1. An electromagnetic induction heating device for high temperature particles, characterized in that: The device comprises an induction heating coil (3), ceramic particles (5), induction heated particles (6), a diamagnetic tube (7), and a heat-insulating material (8); The anti-magnetic tube (7) is circular in shape, a heat-insulating material (8) is arranged outside the anti-magnetic tube (7), an induction heating coil (3) is wound around the outer wall of the heat-insulating material (8), the induction-heated particles (6) are piled and filled in the anti-magnetic tube (7) to form a porous flow channel, the electromagnetic induction coil (3) generates an alternating magnetic field, and heats the induction-heated particles (6) at a high temperature through the anti-magnetic tube (7), the ceramic particles (5) flow through the porous flow channel by their own gravity and are heated, and the heating process of the induction-heated particles (6) and the heat exchange process of the ceramic particles (5) are both completed in the anti-magnetic tube section.
2. The electromagnetic induction heating device for high temperature particles according to claim 1, characterized in that: The ceramic particles (5) are made of alumina, have a temperature resistance of 1300 degrees, good compression resistance and wear resistance, and a particle size range of 300-500um.
3. The electromagnetic induction heating device for high temperature particles according to claim 1, characterized in that: The induction heated particles (6) are spherical in shape, are always in a static state, and are in a free-stacking state. They are made of ferromagnetic materials containing iron, nickel or cobalt elements or graphite, and have a particle size range of 5-30 mm.
4. The electromagnetic induction heating device for high temperature particles according to claim 1, characterized in that: The material of the anti-magnetic tube (7) is a quartz tube, a glass fiber reinforced plastic tube, or a non-magnetic and conductive material. The anti-magnetic tube (7) is used to accommodate the accumulated induction heated particles (6).
5. The electromagnetic induction heating device for high temperature particles according to claim 1, characterized in that: The induction heated particles (6) are in the form of porous media with a porosity greater than 90%, and the porous media is made of ferromagnetic material containing iron, nickel or cobalt elements or graphite.
6. The electromagnetic induction heating device for high temperature particles according to claim 1, characterized in that: The invention also comprises a feed inlet (4), a supporting screen (9), and a collecting section (10). The feed inlet (4) is arranged at the upper end of the anti-magnetic tube (7), and the supporting screen (9) and the collecting section (10) are arranged at the lower end of the anti-magnetic tube (7). The hole diameter of the supporting screen (9) is smaller than that of the induction heated particles and larger than that of the ceramic particles (5). After being heated, the ceramic particles (5) flow into the collecting section (10) through the supporting screen (9). The collecting section (10) is funnel-shaped.
7. The electromagnetic induction heating device for high temperature particles according to claim 6, characterized in that: It also includes a heat storage tank (13). The ceramic particles (5) flow into the heat storage tank (13) after passing through the collection section (10). The heat storage tank (13) has a heat insulation layer to collect and insulate the high-temperature particles.
8. The electromagnetic induction heating device for high temperature particles according to claim 7, characterized in that: It also includes a temperature sensor (11), a flow regulating valve (12), an electromagnetic induction heating controller (2), and a data acquisition control system (14); the collection section (10) is provided with a temperature sensor (11); the discharge port is provided with a flow regulating valve (12); the induction heating coil (3) is connected to the electromagnetic induction heating controller (2); and the data acquisition control system (14) changes the electric power of the electromagnetic induction heating controller (2).
9. The electromagnetic induction heating device for high temperature particles according to claim 8, characterized in that: It also includes a power supply (1), which is connected to a data acquisition control system (14), and the heating current of the power supply (1) is dynamically adjusted according to the temperature monitoring of the temperature sensor (11).
10. The electromagnetic induction heating device for high temperature particles according to claim 9, characterized in that: The ceramic particles (5) are injected into the feed port (4), and driven by their own gravity, flow into the porous flow channel formed by the accumulation of the induction heated particles (6), and perform convection and radiation heat exchange with the induction heated particles (6), thereby being heated, and then flow into the collection section (10) through the supporting partition (9), and finally flow into the heat storage tank (13) for high-temperature storage.