Integrated electric heat storage system and working method thereof

Abstract

The invention relates to an integrated electric heat storage system and a working method thereof.The system comprises a fluidized bed, an electromagnetic heating coil is arranged on a shell of the fluidized bed, and a power source for storing electric energy supplies power to the fluidized bed; a buried pipe for introducing a flowing working medium is arranged in the fluidized bed; an air inlet pipe is arranged at the bottom of the fluidized bed, the outlet end of the air inlet pipe is communicated with an air distribution plate at the bottom of the fluidized bed, and the inlet end of the air inlet pipe is connected with an air supply pipeline; an air outlet is formed in the top of the fluidized bed and is connected with the inlet end of the air inlet pipe through an air return pipeline; magnetic particles are arranged in the fluidized bed; the magnetic particles comprise first particles and second particles, the critical fluidization speed of the second particles is not less than 10 times of the critical fluidization speed of the first particles, and the particle size of the second particles is not less than 10 times of the particle size of the first particles. The working method comprises the steps that the fluidization air speed is adjusted to control the states of the two kinds of particles, in-situ heat storage of the magnetic particles is achieved, and the advantages of being good in heat exchange performance, small in buried pipe abrasion and high in system integration degree are achieved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to an integrated electric heat storage system and a working method thereof. Background Art

[0002] Compared to direct electrochemical energy storage, converting electrical energy into thermal energy and storing it offers larger installation scales, higher energy storage density, lower technical costs, and longer service life. Furthermore, it can directly provide hot water, steam, and other energy sources for daily life and production. Currently, electrically heated fluidized bed solid energy storage has become an effective and feasible solution for converting electrical energy into thermal energy for storage and reuse. This solution primarily consists of a fluidized bed thermal storage unit, which utilizes solid particles for sensible heat storage. The flowing air consumes the stored heat from the solid particles and transfers it to a heat exchanger, which then supplies heat to the user. The problem with this approach is that an additional heat exchanger is required for user-side heating, resulting in high heat exchange losses and low system integration. If a fluid working medium pipeline is used to directly exchange heat with the solid particles in the fluidized bed, there is a risk of frequent contact between the particles and buried pipes immersed in the bed, causing wear on the pipes. Furthermore, existing electrically heated fluidized bed solid energy storage systems are complex in structure, bulky, and difficult to move, failing to meet the demands for convenient equipment design and use. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the present invention provides an integrated electric thermal storage system and its working method, which solves the technical problems in the existing technology that the electric energy storage system cannot take into account the heat exchange efficiency, prevention of buried pipe wear and system structure integration.

[0004] The technical solution adopted in the present invention is as follows:

[0005] The present invention provides an integrated electric heat storage system, comprising a fluidized bed, an outer shell of which is provided with an electromagnetic heating coil powered by a power source for storing electrical energy; an embedded pipe is provided in the fluidized bed, and a fluid is passed through the embedded pipe;

[0006] An air inlet pipe is provided at the bottom of the fluidized bed, the outlet end of the air inlet pipe is connected to the air distribution plate at the bottom of the fluidized bed, the inlet end of the air inlet pipe is connected to the air supply pipe, and the air supply pipe is provided with a fan;

[0007] An air outlet is provided on the top of the fluidized bed, which is connected to the inlet end of the air inlet pipe through a return air duct, and a circulation pump is provided on the return air duct;

[0008] Magnetic particles are provided in the fluidized bed, and in a stacked state, the buried pipe can be immersed; the magnetic particles include first particles and second particles, the critical fluidization velocity of the second particles is not less than 10 times the critical fluidization velocity of the first particles, and the particle size of the second particles is not less than 10 times the particle size of the first particles.

[0009] Further technical solutions are:

[0010] The particle size of the first particles ranges from 0.2 to 1.0 mm; the particle size of the second particles ranges from 5 to 10 mm.

[0011] The first particles include one or more of iron-based magnetic particles, nickel-based magnetic particles, and cobalt-based magnetic particles; the second particles include one or more of iron-based magnetic particles, nickel-based magnetic particles, and cobalt-based magnetic particles.

[0012] It also includes an integrated box, steam engine and running mechanism;

[0013] The fluidized bed is arranged in the integrated box, and the inlet and outlet ends of the buried pipe extend out of the integrated box respectively;

[0014] The steam engine is arranged in the integrated box, and the integrated box is arranged on the walking mechanism;

[0015] The outlet end of the buried pipe is provided with a branch pipe, the outlet of which is connected to the steam engine, and the steam engine is connected to the traveling mechanism through a transmission shaft.

[0016] The integrated box is provided with a hook.

[0017] The walking mechanism is a four-wheel and one-belt mechanism.

[0018] The connecting line of the air inlet pipe and the air outlet coincides with the central axis of the fluidized bed, and the return air duct is arranged symmetrically with respect to the central axis.

[0019] The present invention also provides a method for operating the integrated electric heat storage system, comprising:

[0020] When energy storage is required, the electromagnetic heating coil converts the electrical energy to be stored into thermal energy, and the fan and circulation pump are turned on to supply air to the fluidized bed through the air supply pipe, so that the first particles are in a fluidized state and the second particles are in a static state, thereby achieving non-contact heating of the magnetic particles;

[0021] When energy storage and energy release are not required, the air supply is stopped to make the magnetic particles stationary for in-situ heat storage;

[0022] When energy needs to be released outward, the fan and the circulation pump are turned on to supply air to the fluidized bed through the air supply pipe, so that the first particles are in a fluidized state and the second particles are in a static state, and the heat of the magnetic particles is released to the flowing working medium in the buried pipe. The flowing working medium after absorbing heat is used to couple the power cycle for secondary power generation, or directly supply heat to the user side.

[0023] Further technical solutions are:

[0024] When energy storage is required, the fluidization wind speed of the fluidized bed is 1 to 4 times the critical fluidization speed of the first particles; when energy release is required, the fluidization wind speed of the fluidized bed is 2 to 4 times the critical fluidization speed of the first particles.

[0025] When energy needs to be released externally, it also includes:

[0026] The integrated electric heat storage system is moved by using the kinetic energy provided by the flow medium after absorbing heat.

[0027] The beneficial effects of the present invention are as follows:

[0028] The present invention controls the state of the first and second particles by fluidizing the wind speed, achieving in-situ heat absorption, heat storage, and heat release of the magnetic particles, thereby ensuring heat exchange performance while reducing buried pipe wear and improving the integration level of the system. Specific advantages include:

[0029] 1. This invention uses solid magnetic particles as a heat absorption, storage, and release medium, offering high operating temperatures, high heat storage density, low cost, and easy availability. The magnetic particles utilize a cross-scale dual-size design. By controlling the fluidization of small-size primary particles while keeping large-size secondary particles stationary, this technology combines the superior heat storage and release performance of fluidized small-size particles with the potential for pipe wear caused by the fluidization of all particles within the fluidized bed.

[0030] 2. This invention boasts a high level of integration, eliminating the need for an additional heat exchanger and placing the buried pipe directly within the fluidized bed. By utilizing fluidization technology within the fluidized bed for contactless transport, the particles achieve rapid "in-situ" heating, heat storage, and heat release, simplifying operation and resolving the challenge of conveying high-temperature solid particles. This also reduces equipment size, manufacturing costs, and floor space.

[0031] 3. The system of the present invention has a mobile function and is convenient for transportation. For small-capacity fluidized beds, the lifting is facilitated by fixing a hook on the top of the integrated box; for large-capacity fluidized beds, a steam engine is installed inside the device box, which converts the thermal energy carried by the flowing working fluid output by the buried pipe into mechanical energy, driving the walking mechanism for self-movement. That is, the flowing working fluid of the present invention can, on the one hand, provide thermal energy to the outside or couple the power cycle system for secondary power generation, and on the other hand, it can be partially converted into kinetic energy to realize the convenient movement of the system. Therefore, the present invention can meet the needs of power production departments with high costs for laying transmission lines such as offshore wind power or photovoltaic and wind power in remote areas, or factories or villages in remote areas that need to use thermal energy, thereby reducing the cost of energy transfer. It provides a new idea for the convenient design of energy storage systems.

[0032] Other features and advantages of the present invention will be set forth in the following description or may be learned by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of the system of Example 1 of the present invention.

[0034] Figure 2 This is a structural diagram of the system of Example 2 of the present invention.

[0035] In the figure: 1. Electric wire; 2. Magnetic induction coil; 3. Fluidized bed; 4. Air distribution plate; 6. Air outlet; 7. Return air duct; 8. Circulation pump; 9. Air supply duct; 10. Fan; 11. Buried pipe; 12. Integrated box; 13. Hook; 14. Branch pipe; 15. Steam engine; 16. Drive shaft; 17. Travel mechanism; 18. Air inlet pipe; 51. First particle; 52. Second particle. DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0037] Example 1

[0038] See also Figure 1 The integrated electric heat storage system of this embodiment includes a fluidized bed 3, an outer shell of which is provided with an electromagnetic heating coil, which specifically includes an electric wire 1 and a magnetic induction coil 2, wherein one end of the electric wire 1 is connected to a power source and the other end is connected to the magnetic induction coil 2, and the magnetic induction coil 2 is wound around the outer shell of the fluidized bed 3; the electric energy of the said electric wire 1 can come from unstable electric energy such as wind power and solar power units, or stable electric energy such as coal power and gas power generation, specifically including wind power, photovoltaic power generation, solar thermal power generation, thermal power generation and nuclear power, etc.

[0039] An embedded pipe 11 is provided in the fluidized bed 3 for introducing a fluid medium which absorbs heat and supplies heat to the user side. Specifically, the fluid medium may be water, steam, CO2 or other media.

[0040] As a preferred embodiment, the flowing working fluid of this embodiment is water or steam from a factory.

[0041] As a preferred embodiment, the shell of the fluidized bed 3 is a heat-insulating shell.

[0042] An air inlet pipe 18 is provided at the bottom of the fluidized bed 3 , the outlet end of the air inlet pipe 18 is connected to the air distribution plate 4 at the bottom of the fluidized bed 3 , and the inlet end of the air inlet pipe 18 is connected to the air supply pipe 9 , on which a fan 10 is provided.

[0043] The air distribution plate 4 can make the air flow enter the fluidized bed 3 more evenly.

[0044] As a preferred embodiment, the inlet end of the air supply duct 9 is connected to the atmosphere and is provided with a valve.

[0045] An air outlet 6 is provided at the top of the fluidized bed 3 , which is connected to the inlet end of the air inlet pipe 18 through a return air duct 7 , and a circulation pump 8 is provided on the return air duct 7 .

[0046] As a preferred embodiment, the line connecting the air inlet pipe 18 and the air outlet 6 coincides with the central axis of the fluidized bed 3, and the return air duct 7 includes two sections, which are symmetrically arranged with respect to the central axis, and a circulation pump 8 is provided on each section.

[0047] Magnetic particles are provided in the fluidized bed 3 , and in a stacked state the buried pipe 11 can be immersed therein.

[0048] The magnetic particles can absorb the heat released by the electromagnetic heating coil and store the heat. The magnetic particles have good high temperature resistance, high energy storage density, low price, and are recyclable, making them a good heat storage material.

[0049] The magnetic particles include first particles 51 and second particles 52 . The critical fluidization velocity of the second particles 52 is not less than 10 times the critical fluidization velocity of the first particles 51 , and the particle size of the second particles 52 is not less than 10 times the particle size of the first particles 51 .

[0050] By limiting the critical fluidization velocity and particle size, it can be ensured that under corresponding air supply conditions, the first particles 51 with small particle sizes in the fluidized bed are in a fluidized state and the second particles 52 with large particles are in a stationary state, thereby realizing energy storage and release of the fluidized bed.

[0051] As a preferred embodiment, the particle size of the first particles 51 ranges from 0.2 to 1.0 mm, and more preferably from 0.2 to 0.5 mm; the particle size of the second particles 52 ranges from 5 to 10 mm, and more preferably from 8 to 10 mm.

[0052] Preferably, the first particles 51 include one or more of iron-based magnetic particles, nickel-based magnetic particles, and cobalt-based magnetic particles, with iron-based magnetic particles being preferred, such as ferroferric oxide particles. The second particles 52 include one or more of iron-based magnetic particles, nickel-based magnetic particles, and cobalt-based magnetic particles, with iron-based magnetic particles being preferred, such as ferroferric oxide particles. The above material selection ensures that the densities of the first and second particles are of the same order of magnitude.

[0053] As a preferred embodiment, in the magnetic particles, the mass ratio of the first particles 51 to the second particles 52 is 1:1000.

[0054] The operating method of the integrated electric thermal storage system of this embodiment includes the following steps:

[0055] S1. When energy storage is required, electrical energy is applied to the magnetic induction coil 2 through the wire 1 to generate an alternating magnetic field, and the fan 10 and the circulation pump 8 are started. Air is supplied to the fluidized bed 3 through the air supply pipe 9, so that the first particles 51 are in a fluidized state while the second particles 52 are in a stationary state. Based on the effects of hysteresis loss, relaxation loss and eddy current loss, the electrical energy is converted into thermal energy to achieve non-contact heating of the magnetic particles.

[0056] S2. When energy storage and external energy supply (i.e., energy release) are not required, the fan 10 and the circulation pump 8 are turned off, and the air supply to the fluidized bed 3 is stopped. The magnetic particles are stationary (the first particles 51 are stationary at the bottom of the fluidized bed 3) and in-situ heat storage is performed.

[0057] S3. When external energy is needed, fan 10 and circulation pump 8 are activated to supply air to fluidized bed 3 through air supply duct 9, causing first particles 51 to enter a bubbling and fluidized state while second particles 52 remain stationary. Heat from the magnetic particles is transferred through buried pipe 11 to the fluid within. The heated fluid is then discharged from the outlet of buried pipe 11 to directly provide hot water or steam for production and domestic use, or to generate secondary electricity through a power cycle.

[0058] As a preferred embodiment, in step S1, the first particles 51 are in a critical fluidized state and the second particles 52 are in a stationary state (see Figure 1 The relative position state of the first particles 51 and the second particles 52 in the fluidized bed). In this state, the fluidization wind speed is the critical fluidization velocity corresponding to the wide screening state of the solid particles and the thickness of the material layer. It is the minimum superficial velocity of the material layer when the first particles 51 transition from a static state to a fully fluidized state. This speed is far from the critical fluidization velocity of the second particles 52, so the second particles 52 remain stationary. The gaps between the second particles 52 can serve as fluidization channels for the first particles 51, that is, the first particles 51 can be fluidized in the gaps between the second particles 52 without affecting the second particles 52. The fluidization of the first particles 51 improves the heat absorption efficiency of the particles. Since the first particles 51 and the second particles 52 are both magnetic particles, the second particles 52 can be heated even though they are stationary. The fluidized first particles 51 can also act as heat carriers, further ensuring that both particles are heated evenly. In addition, since the fluidization wind speed is relatively low in this state, the fan power consumption is low, and the heat carried away by the fluidized medium is small, which is conducive to rapid energy storage. At the same time, the fluidizing air flows back from the air outlet 6 at the top of the fluidized bed 3 through the return air duct 7 to the air inlet pipe 18, so that the heat in the fluidized medium is recycled.

[0059] Since only the first particles 51 are fluidized, the wear on the buried pipe 11 is greatly reduced. Therefore, as an improvement, in step S1, the fluidization wind speed can also be 2 to 4 times the critical fluidization speed of the first particles 51.

[0060] As a preferred embodiment, before step S1 , the two particles are mixed evenly and then added into the fluidized bed 3 to ensure uniformity of the fluidization channel of the first particles 51 and uniform heating of the magnetic particles during the fluidization process.

[0061] As can be understood, the electromagnetic heating coil formed by the wire 1 and the magnetic induction coil 2, based on electromagnetic heating technology, offers advantages such as fast heating rate, uniform heating, high safety, and high electrical-to-heat conversion efficiency. Furthermore, it offers low losses, a long service life, low cost, easier operation, stepless adjustment of heating power, and greater energy efficiency. The magnetic induction coil 2 is preferably evenly wound around the outside of the fluidized bed 3, utilizing the principle of electromagnetic heating to achieve contactless heating of the particles.

[0062] As a preferred embodiment, in step S3, the first particles 51 are in a bubbling fluidized state while the second particles 52 are in a stationary state, so that the heat stored in the particles can be released into the fluidized bed and transferred to the buried pipe 11. When the first particles 51 are in a bubbling fluidized state, the fluidization wind speed is approximately several times (less than 10 times) the critical fluidization velocity of the first particles 51, so the second particles 52 remain stationary. Similar to step S1, in this state, the first particles 51 can be fluidized in the gaps between the second particles 52, and the fluidization process can improve the heat release efficiency of the particles. In addition, the fluidization state of the first particles 51 is further strengthened compared to step S1, improving its own heat exchange intensity while ensuring that the heat of the second particles 52 is also transferred to the buried pipe 11, so that the heat is released evenly and fully. Since the second particles 52 are still in a stationary state, the degree of wear on the buried pipe 11 is reduced. In addition, the heat of the fluidized medium can be recycled through the return air duct 7.

[0063] As a preferred embodiment, in step S3 , the fluidization wind speed is 2 to 4 times the critical fluidization speed of the first particles 51 .

[0064] It is understandable that those skilled in the art can adjust parameter values such as the number of magnetic particles, fluidization wind speed, mass ratio of the two particles and particle size ratio according to actual application scenarios and energy storage scale requirements to ensure heat storage and release efficiency and control energy consumption.

[0065] Specifically, the fluidization wind speed can be adjusted by controlling the fan 10 .

[0066] As a preferred embodiment, the buried pipe 11 may be a copper pipe to ensure heat exchange efficiency.

[0067] As a preferred embodiment, the system of this embodiment further includes an integrated box 12 , the fluidized bed 3 is disposed in the integrated box 12 , and the inlet and outlet ends of the buried pipe 11 extend out of the integrated box 12 respectively.

[0068] Preferably, a hook 13 is provided on the integrated box 12. This allows the entire system to be quickly transported by crane or forklift to a factory, business, or centralized heating facility requiring heat energy. This is particularly suitable for scenarios requiring frequent movement and loading and unloading, or where smaller thermal storage capacity is required.

[0069] As an improvement, the system of this embodiment is configured with an intelligent control module, which is used to monitor the power load, bed temperature changes and the temperature of the flowing working fluid at the outlet end of the buried pipe 11 in real time, and automatically adjust the power output by the wire 1 to the magnetic induction coil 2 and the flow rate of the flowing working fluid in the buried pipe 11 according to the monitoring results, so as to adjust the heat storage and heat release processes to maximize energy utilization and ensure safe and stable operation of the system.

[0070] Example 2

[0071] See also Figure 2 The integrated electric heat storage system of this embodiment, based on Example 1, further includes a steam engine 15 and a traveling mechanism 17. The steam engine 15 is arranged in the integrated box 12, and the integrated box 12 is arranged on the traveling mechanism 17; the outlet end of the buried pipe 11 is provided with a branch pipe 14, the outlet of which is connected to the steam engine 15, and the steam engine 15 is connected to the traveling mechanism 17 through a transmission shaft 16.

[0072] Specifically, high-temperature, high-pressure steam generated at the outlet of buried pipe 11 is transported through a branch pipe 14 to a steam engine 15, which then drives it. The output of steam engine 15 transmits power to traveling mechanism 17 via a transmission shaft 16, enabling autonomous movement. This reduces the system's reliance on external power sources and improves flexibility and convenience.

[0073] As a preferred embodiment, the running mechanism 17 comprises four wheels and one belt. This is the chassis component of a commonly used crawler-type running device. The "four wheels" are the drive wheels, guide wheels (guide wheels), supporting rollers, and supporting rollers (sprocket wheels), and the "one belt" is the crawler track. When the system needs to move on hills or uneven terrain (currently, most wind and solar energy is obtained in mountainous areas), choosing a four-wheel-and-one-belt running mechanism is more convenient. The drive wheels are connected to the drive shaft 16 for power input.

[0074] Preferably, the system is also equipped with a vehicle energy consumption calculation system and an intelligent driving system to calculate the drivable mileage in real time and monitor the unmanned driving route so that it can automatically navigate to the next heating location or area receiving electric heating.

[0075] The operating method of the integrated electric thermal storage system of this embodiment includes S1 to S3 described in Example 1, and further includes:

[0076] When external energy supply is required, the flowing working medium (preferably high-temperature and high-pressure steam) at the outlet of the buried pipe 11 after absorbing heat is used as the power source, and kinetic energy is supplied to the walking mechanism 17 through the steam engine 15 and the transmission shaft 16 to move the integrated electric heat storage system.

[0077] Those skilled in the art will understand that the foregoing descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will be able to modify the technical solutions described in the foregoing embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An integrated electric heat storage system comprising a fluidized bed (3) having an electromagnetic heating coil provided on its housing and powered by a power source for the electric energy to be stored; An embedded pipe (11) is provided in the fluidized bed (3), and a flowing medium flows through the embedded pipe (11); An air inlet pipe (18) is provided at the bottom of the fluidized bed (3), the outlet end of the air inlet pipe (18) is communicated with the air distribution plate (4) at the bottom of the fluidized bed (3), and the inlet end of the air inlet pipe (18) is connected to the air supply pipe (9), and a fan (10) is provided on the air supply pipe (9); The top of the fluidized bed (3) is provided with an air outlet (6), which is connected to the inlet end of the air inlet pipe (18) through a return air duct (7), and a circulation pump (8) is provided on the return air duct (7); Magnetic particles are provided in the fluidized bed (3), and in a stacked state, the buried pipe (11) can be immersed; the magnetic particles include first particles (51) and second particles (52), the critical fluidization velocity of the second particles (52) is not less than 10 times the critical fluidization velocity of the first particles (51), and the particle size of the second particles (52) is not less than 10 times the particle size of the first particles (51).

2. The integrated electric heat storage system according to claim 1, characterized in that: The particle size of the first particles (51) ranges from 0.2 to 1.0 mm; the particle size of the second particles (52) ranges from 5 to 10 mm.

3. The integrated electric thermal storage system according to claim 1, characterized in that: The first particles (51) include one or more of iron-based magnetic particles, nickel-based magnetic particles, and cobalt-based magnetic particles; the second particles (52) include one or more of iron-based magnetic particles, nickel-based magnetic particles, and cobalt-based magnetic particles.

4. The integrated electric heat storage system according to claim 1, characterized in that: It also includes an integrated box (12), a steam engine (15) and a running mechanism (17); The fluidized bed (3) is arranged in the integrated box (12), and the inlet and outlet ends of the buried pipe (11) respectively extend out of the integrated box (12); The steam engine (15) is arranged in the integrated box (12), and the integrated box (12) is arranged on the walking mechanism (17); The outlet end of the buried pipe (11) is provided with a branch pipe (14), the outlet of which is connected to the steam engine (15), and the steam engine (15) is connected to the walking mechanism (17) through a transmission shaft (16).

5. The integrated electric heat storage system according to claim 4, characterized in that: The integrated box (12) is provided with a hook (13).

6. The integrated electric heat storage system according to claim 4, characterized in that: The walking mechanism (17) is a four-wheel one-belt mechanism.

7. The integrated electric thermal storage system according to claim 1, characterized in that: The connecting line of the air inlet pipe (18) and the air outlet (6) coincides with the central axis of the fluidized bed (3), and the return air duct (7) is arranged symmetrically with respect to the central axis.

8. A method for operating the integrated electric thermal storage system according to any one of claims 1 to 7, characterized in that: include: When energy storage is required, the electromagnetic heating coil converts the electrical energy to be stored into thermal energy, turns on the fan (10) and the circulation pump (8), and supplies air to the fluidized bed (3) through the air supply pipe (9), so that the first particles (51) are in a fluidized state and the second particles (52) are in a stationary state, thereby achieving non-contact heating of the magnetic particles; When energy storage and energy release are not required, the air supply is stopped to make the magnetic particles stationary for in-situ heat storage; When it is necessary to release energy outward, the fan (10) and the circulation pump (8) are turned on, and air is supplied to the fluidized bed (3) through the air supply pipe (9), so that the first particles (51) are in a fluidized state and the second particles (52) are in a static state, and the heat of the magnetic particles is released to the flowing working medium in the buried pipe (11). The flowing working medium after absorbing heat is used to couple the power cycle for secondary power generation, or directly supply heat to the user side.

9. The working method according to claim 8, characterized in that: When energy storage is required, the fluidization wind speed of the fluidized bed (3) is 1 to 4 times the critical fluidization speed of the first particles (51); when energy release is required, the fluidization wind speed of the fluidized bed (3) is 2 to 4 times the critical fluidization speed of the first particles (51).

10. The working method according to claim 8, characterized in that: When energy needs to be released externally, it also includes: The integrated electric heat storage system is moved by using the kinetic energy provided by the flow medium after absorbing heat.

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