Flywheel energy storage and waste heat storage cooperated power generation mechanism and power system

Abstract

The invention discloses a flywheel energy storage and waste heat storage cooperated power generation mechanism and an electric power system, the mechanism comprises a flywheel energy storage system, a heat dissipation device is installed in the flywheel energy storage system, and the heat dissipation device is provided with a plurality of connecting ends; one end of the cooling system is connected with the first end of the heat dissipation device, the other end of the cooling system is connected with the second end of the heat dissipation device, and a main cooling loop is formed between the cooling system and the heat dissipation device; one end of the waste heat storage system is connected with the third end of the heat dissipation device, the other end of the waste heat storage system is connected with the fourth end of the heat dissipation device, and a waste heat branch is formed between the waste heat storage system and the heat dissipation device; the two ends of the power generation device are both connected with the waste heat storage system, gradient utilization of energy is achieved, the comprehensive utilization efficiency of the energy is greatly improved, the heat management limitation of a traditional flywheel energy storage system is broken through, and a four-in-one energy closed loop of energy storage, heat dissipation, heat storage and power generation is constructed; and a high-energy-efficiency and high-reliability physical energy storage solution is provided for constructing a novel power system.

Description

Technical Field

[0001] The present invention belongs to the field of advanced energy storage and thermoelectric conversion technology, and specifically relates to a flywheel energy storage coordinated with waste heat storage power generation mechanism and a power system. Background Art

[0002] In the energy sector, with the increasing penetration of renewable energy in power systems and the growing demand for frequency regulation capabilities in power grids, the importance of energy storage technology has become increasingly prominent. Flywheel energy storage technology, with its millisecond-level response characteristics, deep charge and discharge cycle life reaching millions of times, and significant eco-friendliness, demonstrates unique advantages in a wide range of areas, including power system frequency regulation, rail transit energy recovery, and pulse power support, making it a research hotspot in the energy storage field.

[0003] Modern flywheel systems generally use carbon fiber composite rotors, combined with magnetic levitation bearings and high-temperature superconducting magnetic bearing technology, which has enabled the energy storage density to successfully exceed 200Wh / kg and the system efficiency to reach 85% to 90%.

[0004] However, during the high-speed rotation of the flywheel (which can reach 60,000 rpm), factors such as motor winding copper loss, core eddy current loss, bearing friction, and the viscous shear interaction between the rotor and the air gap generate a large amount of heat energy. This heat energy accounts for approximately 10% to 15% of the input electrical energy. If not effectively treated, it will not only affect the performance and life of the flywheel system, but also result in energy waste.

[0005] Currently, flywheel systems mostly rely on forced air cooling or liquid cooling to maintain equipment temperature rise. For example, BeaconPower in the United States uses axial ventilation cooling technology, while Piller in Germany has developed an oil-immersed, self-circulating cooling system. These traditional cooling technologies have significant drawbacks. First, heat is directly lost to the environment during the cooling process, resulting in energy waste and inefficient energy utilization. Second, a single cooling path cannot simultaneously address both transient thermal shock and steady-state heat dissipation requirements, making it difficult for flywheel systems to achieve optimal heat dissipation under varying operating conditions. It has been estimated that a single 100kW flywheel unit can dissipate up to 1.2×10^5 MJ of heat annually, equivalent to the calorific value of 40 kg of standard coal. If 30% of this heat could be converted to electricity, annual power generation could increase by approximately 10 MWh, offering significant energy recovery potential.

[0006] At the same time, in the industrial production sector, waste heat utilization is a key component in improving energy efficiency. Chinese industrial enterprises have relatively mature technologies for utilizing medium- and high-temperature waste heat above 150°C. This waste heat can be used for power generation or direct reuse. However, for medium-temperature waste heat / waste heat below 150°C (such as water, gas, and steam) and low-temperature waste heat / waste heat below 90°C, the current method is to cool and then directly discharge it into the atmosphere. Low-temperature waste heat below 90°C is ubiquitous in industrial processes such as building materials, metallurgy, chemicals, and light industry, as well as in people's daily lives. Existing flywheel energy storage technologies cannot effectively recycle and utilize this low-temperature waste heat. Based on the above technological development trends, in order to break through the comprehensive energy efficiency bottleneck of flywheel energy storage, it is particularly important to develop an energy storage-type thermoelectric conversion system suitable for low-temperature waste heat. Summary of the Invention

[0007] The purpose of the present invention is to provide a flywheel energy storage and waste heat storage power generation mechanism and power system to solve the technical defect in the prior art that flywheel energy storage technology cannot achieve efficient recovery and utilization of low-temperature waste heat.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, a flywheel energy storage and waste heat storage power generation mechanism is provided, comprising: A flywheel energy storage system is internally provided with a heat sink having a plurality of connection ends; a cooling system, one end of which is connected to the first end of the heat sink, and the other end of which is connected to the second end of the heat sink, wherein a main cooling circuit is formed between the cooling system and the heat sink; A waste heat storage system, one end of which is connected to the third end of the heat sink, and the other end of which is connected to the fourth end of the heat sink, wherein a waste heat branch is formed between the waste heat storage system and the heat sink; The power generation device has both ends connected to the waste heat storage system.

[0009] Furthermore, the heat dissipation method of the heat dissipation device is one or more of through-flow cooling in the hollow shaft, channel cooling in the shell, or heat pipe cooling.

[0010] Furthermore, the heat dissipation device stores a heat dissipation medium, and the heat dissipation medium is water or thermal oil.

[0011] Furthermore, the cooling system comprises: A microchannel parallel flow condenser is connected to a variable frequency fan.

[0012] Furthermore, the pressure drop of the cooling system is equal to or less than 0.2 MPa.

[0013] Furthermore, the waste heat storage system stores waste heat storage medium.

[0014] Furthermore, the waste heat storage medium is molten salt.

[0015] Furthermore, the molten salt is an alkali metal or alkaline earth metal and one of halides, silicates, carbonates, nitrates and phosphates.

[0016] Furthermore, the power generation device includes a heat exchanger, and the heat exchanger is connected to a generator through a turbine.

[0017] In a second aspect, a power system is provided, which includes the flywheel energy storage and waste heat storage power generation mechanism as described above.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a waste heat storage system and forming a waste heat branch with the heat dissipation device inside the flywheel energy storage system, the waste heat generated by the flywheel system can be effectively recovered and stored, avoiding unnecessary energy loss and improving the overall energy utilization efficiency. By connecting the low-temperature waste heat storage system with the power generation device, the recovered waste heat (including flywheel waste heat and other low-temperature waste heat that may be collected) is used to generate electricity, further tapping the potential value of energy, realizing the cascade utilization of energy, greatly improving the comprehensive utilization efficiency of energy, and breaking through the thermal management limitations of traditional flywheel energy storage systems. A four-in-one energy closed loop of "energy storage-heat dissipation-heat storage-power generation" is constructed, providing a high-efficiency and highly reliable physical energy storage solution for the construction of new power systems.

[0019] 2. During the operation of the flywheel energy storage system, the heat distribution and heat dissipation requirements generated under different working conditions may be different. A combination of multiple heat dissipation methods can flexibly adjust the heat dissipation strategy according to the actual working conditions to meet the different needs of transient thermal shock and steady-state heat dissipation.

[0020] 3. Both water and thermal oil have good thermal conductivity, which can quickly transfer heat from the heat source to other parts of the heat dissipation device and then dissipate it to the surrounding environment, helping to reduce heat accumulation inside the flywheel system, improve heat dissipation efficiency, and ensure that the flywheel energy storage system operates in an efficient state.

[0021] 4. The microchannel parallel flow condenser has a tiny channel structure. Compared with the traditional condenser, its heat exchange area can be significantly increased under the same volume.

[0022] 5. When the pressure drop is equal to or less than 0.2 MPa, the pressure in the system is relatively low and stable.

[0023] 6. The waste heat storage medium can absorb and store this heat and release it when needed, thus realizing the recovery and reuse of waste heat and improving the comprehensive energy utilization rate of the entire system.

[0024] 7. Molten salt has high specific heat capacity and thermal stability and can store a large amount of heat per unit volume.

[0025] 8. Molten salt has good thermal conductivity and can quickly transfer heat to other media, thereby improving the heat exchange efficiency of the waste heat utilization system and enabling heat to be recovered and utilized more effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 Schematic diagram of the flywheel energy storage and waste heat storage power generation mechanism provided by the present invention; Among them: 1. Flywheel energy storage system; 2. Cooling system; 3. Heat dissipation device; 4. Waste heat storage system; 5. Power generation device; 6. Main cooling circuit; 7. Waste heat branch. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] In the energy sector, with the increasing penetration of renewable energy in power systems and the growing demand for frequency regulation capabilities in power grids, the importance of energy storage technology has become increasingly prominent. Flywheel energy storage technology, with its millisecond-level response characteristics, deep charge and discharge cycle life reaching millions of times, and significant eco-friendliness, demonstrates unique advantages in a wide range of areas, including power system frequency regulation, rail transit energy recovery, and pulse power support, making it a research hotspot in the energy storage field.

[0035] Modern flywheel systems generally use carbon fiber composite rotors, combined with magnetic levitation bearings and high-temperature superconducting magnetic bearing technology, which has enabled the energy storage density to successfully exceed 200Wh / kg and the system efficiency to reach 85% to 90%.

[0036] However, during the high-speed rotation of the flywheel (which can reach 60,000 rpm), factors such as motor winding copper loss, core eddy current loss, bearing friction, and the viscous shear interaction between the rotor and the air gap generate a large amount of heat energy. This heat energy accounts for approximately 10% to 15% of the input electrical energy. If not effectively treated, it will not only affect the performance and life of the flywheel system, but also result in energy waste.

[0037] Currently, flywheel systems mostly rely on forced air cooling or liquid cooling to maintain equipment temperature rise. For example, BeaconPower in the United States uses axial ventilation cooling technology, while Piller in Germany has developed an oil-immersed, self-circulating cooling system. These traditional cooling technologies have significant drawbacks. First, heat is directly lost to the environment during the cooling process, resulting in energy waste and inefficient energy utilization. Second, a single cooling path cannot simultaneously address both transient thermal shock and steady-state heat dissipation requirements, making it difficult for flywheel systems to achieve optimal heat dissipation under varying operating conditions. It has been estimated that a single 100kW flywheel unit can dissipate up to 1.2×10^5 MJ of heat annually, equivalent to the calorific value of 40 kg of standard coal. If 30% of this heat could be converted to electricity, annual power generation could increase by approximately 10 MWh, offering significant energy recovery potential.

[0038] At the same time, in the industrial production sector, waste heat utilization is a key component in improving energy efficiency. Chinese industrial enterprises have relatively mature technologies for utilizing medium- and high-temperature waste heat above 150°C. This waste heat can be used for power generation or direct reuse. However, for medium-temperature waste heat / waste heat below 150°C (such as water, gas, and steam) and low-temperature waste heat / waste heat below 90°C, the current method is to cool and then directly discharge it into the atmosphere. Low-temperature waste heat below 90°C is ubiquitous in industrial processes such as building materials, metallurgy, chemicals, and light industry, as well as in people's daily lives. Existing flywheel energy storage technologies cannot effectively recycle and utilize this low-temperature waste heat. Based on the above technological development trends, in order to break through the comprehensive energy efficiency bottleneck of flywheel energy storage, it is particularly important to develop an energy storage-type thermoelectric conversion system suitable for low-temperature waste heat.

[0039] To address the technical deficiencies mentioned in the background art, this embodiment provides a flywheel energy storage and waste heat storage power generation mechanism and a power system. The present invention is further described in detail below with reference to the accompanying drawings: In a first aspect, an embodiment of the present invention provides a flywheel energy storage and waste heat storage power generation mechanism, such as Figure 1 As shown, the power generation mechanism includes a flywheel energy storage system 1, a cooling system 2, a heat sink 3, a waste heat storage system 4 and a power generation device 5; wherein the heat sink 3 is installed inside the flywheel energy storage system 1, and the heat sink 3 has multiple connection ends; the cooling system 2 has one end connected to the first end of the heat sink 3 and the other end connected to the second end of the heat sink 3, and the cooling system 2 and the heat sink 3 form a main cooling circuit 6; The waste heat storage system 4 has one end connected to the third end of the heat dissipation device 3 and the other end connected to the fourth end of the heat dissipation device 3. A waste heat branch 7 is formed between the waste heat storage system 4 and the heat dissipation device 3. Both ends of the power generation device 5 are connected to the waste heat storage system 4.

[0040] In the above structure, the flywheel energy storage system 1 generates a large amount of heat energy during high-speed rotation. Traditionally, this heat energy is often directly dissipated, resulting in energy waste. However, the present technical solution provides a waste heat storage system 4, which, together with the heat dissipation device 3 inside the flywheel energy storage system 1, forms a waste heat branch 7. This can effectively recover and store the waste heat generated by the flywheel system, avoiding unnecessary energy loss and improving the overall energy utilization efficiency. At the same time, the waste heat storage system 4 is connected to the power generation device 5, and the recovered waste heat (including flywheel waste heat and other low-temperature waste heat that may be collected) is used to generate electricity. For example, low-temperature waste heat below 90°C, which is widely present in industrial production or daily life, can be converted into electrical energy, further tapping the potential value of energy, realizing cascade utilization of energy, and greatly improving the comprehensive utilization efficiency of energy. In addition, the cooling system 2 and the heat dissipation device 3 form a main cooling circuit 6, which can perform regular cooling of the flywheel energy storage system 1, ensuring that the flywheel energy storage system 1 operates within an appropriate temperature range, avoiding performance degradation or damage due to overheating, and extending the service life of the flywheel energy storage system 1.

[0041] In addition, the presence of the waste heat branch 7 can share part of the heat and work in conjunction with the main cooling circuit 6 to better cope with transient thermal shock and steady-state heat dissipation requirements, so that the flywheel energy storage system 1 can maintain good heat dissipation effect under different working conditions, thereby improving the stability and reliability of the system.

[0042] In summary, this power generation mechanism organically combines flywheel energy storage technology, waste heat recovery and utilization technology, and power generation technology to construct a four-in-one energy closed loop of energy storage-heat dissipation-heat storage-power generation. It provides a high-efficiency and highly reliable physical energy storage solution for the construction of new power systems and realizes the coordinated development of different energy technologies. This integration not only plays the advantages of each technology, but also provides new ideas and directions for technological innovation in the energy field, which helps to promote the overall progress of energy technology. In specific applications, by recycling and utilizing waste heat, the direct emission of heat into the atmosphere is reduced, reducing thermal pollution to the surrounding environment. At the same time, it reduces the additional energy extraction and consumption caused by energy waste, indirectly reducing pollutant emissions in the energy production process, and has significant ecological and environmental benefits.

[0043] As described in the background technology, the annual heat dissipation of a single 100kW-class flywheel unit is considerable. If partial thermal-electrical conversion can be achieved, the annual power generation can be increased. This technical solution converts the recovered waste heat into electrical energy through the coordinated work of the waste heat storage system 4 and the power generation device 5, thereby increasing additional power output and bringing direct economic benefits to the enterprise or user. Through the implementation of the above process, energy utilization efficiency is improved, energy waste is reduced, and the energy procurement expenditure of the enterprise or user is correspondingly reduced. At the same time, the use of low-temperature waste heat for power generation is equivalent to the development of a new energy source, further reducing dependence on traditional energy, helping to reduce energy costs and improve economic benefits.

[0044] Furthermore, the heat dissipation device 3 stores a heat dissipation medium. In one embodiment, the heat dissipation medium is water or thermal oil; in another embodiment, the heat dissipation medium can be air-cooled or phase-change cooled; wherein, the heat dissipation method of the heat dissipation device 3 in this solution is one or more of hollow shaft through-flow cooling, channel cooling in the shell, or heat pipe cooling.

[0045] Different heat dissipation methods have their own characteristics and advantages. Multiple heat dissipation methods can be used in combination or individually, depending on the specific operating conditions. This solution is not limited to this. For example, through-flow cooling in the hollow shaft can directly cool key heat-generating components such as the flywheel rotor, removing heat from the core area; channel cooling in the shell can expand the heat dissipation area and dissipate heat for the entire flywheel energy storage system 1; heat pipe cooling has efficient heat transfer performance and can quickly transfer heat from the heat source to the heat sink. If these three methods are used in combination, they can more comprehensively and efficiently remove the heat generated by the flywheel energy storage system 1, effectively reducing the system temperature and ensuring that the flywheel system operates stably within an appropriate temperature range.

[0046] Secondly, during the operation of the flywheel energy storage system 1, the heat distribution and heat dissipation requirements generated under different operating conditions may be different. For example, under transient operating conditions such as system startup or sudden load changes, the rapid response characteristics of heat pipe cooling can quickly remove heat from local high-temperature areas. During the stable operation of the system, through-flow cooling in the hollow shaft and channel cooling in the shell can continuously and stably maintain the system temperature. Regardless of the heat dissipation method used, good heat dissipation can reduce the energy loss of the flywheel energy storage system 1 caused by temperature increase. When the temperature of the flywheel energy storage system 1 is too high, the copper loss of the motor winding and the eddy current loss of the iron core will increase, affecting the energy storage efficiency of the system. By combining multiple heat dissipation methods or selecting an appropriate single heat dissipation method, these losses can be reduced, improving the overall efficiency of the flywheel energy storage system 1, enabling the system to store and release energy more efficiently, and slowing down the aging rate, extending the service life of the equipment, and reducing the maintenance cost and replacement frequency of the equipment.

[0047] Furthermore, different heat dissipation methods can be selected and combined based on the specific structure and spatial layout of the flywheel energy storage system 1. For example, through-flow cooling within the hollow shaft is suitable when the internal space of the rotor allows; channel cooling in the casing can be designed according to the shape and size of the casing; and heat pipe cooling can be flexibly arranged according to the direction and distance of heat transfer. This flexibility allows the heat dissipation device to better adapt to different types and specifications of flywheel energy storage systems 1, improving the system's versatility and scalability.

[0048] Water has a high specific heat capacity, meaning its temperature changes relatively little when absorbing or releasing the same amount of heat. During the operation of flywheel energy storage system 1, the heat dissipating medium absorbs heat. Water's high specific heat capacity allows it to absorb more heat without a sharp rise in its own temperature, effectively dissipating the heat generated by flywheel energy storage system 1 and maintaining a stable system temperature. Although thermal oil has a slightly lower specific heat capacity than water, it also effectively absorbs heat, ensuring effective heat dissipation.

[0049] In terms of system adaptability, water or thermal oil can be well adapted to heat dissipation methods such as hollow shaft through-flow cooling, shell channel cooling, and heat pipe cooling; in addition, in terms of safety and stability, water and thermal oil are chemically stable under normal conditions of use and are not prone to chemical reactions with the material of the heat dissipation device 3, thereby ensuring the long-term reliable operation of the heat dissipation device 3, reducing problems such as corrosion and blockage caused by the reaction between the working fluid and the material, and reducing the maintenance cost and failure risk of the system.

[0050] Furthermore, the cooling system 2 includes a microchannel parallel flow condenser, and a variable frequency fan is connected to the microchannel parallel flow condenser. The pressure drop of the cooling system 2 is equal to or less than 0.2MPa, and the microchannel parallel flow condenser cooperates with the variable frequency fan to achieve 0~100% stepless speed regulation. Among them, the microchannel parallel flow condenser has a tiny channel structure. Compared with the traditional condenser, its heat exchange area can be significantly increased at the same volume. For example, the heat exchange area of ​​the traditional condenser may be a certain value, while the heat exchange area of ​​the microchannel parallel flow condenser can be increased several times or even more through the microchannel design. More heat exchange area means that heat exchange with the heat dissipating medium can be carried out more fully, thereby more effectively dissipating the heat generated by the flywheel energy storage system 1 and improving the heat dissipation efficiency.

[0051] In this solution, the waste heat storage system 4 stores waste heat storage medium, which is molten salt. The molten salt is an alkali metal or alkaline earth metal and one of halides, silicates, carbonates, nitrates and phosphates.

[0052] In this solution, the power generation device 5 includes a heat exchanger, and the heat exchanger is connected to a generator through a turbine.

[0053] When the power generation mechanism is used, the flywheel energy storage system 1 is in operation, and the heat dissipation device 3 also works accordingly, and discharges part of the heat of the heat dissipation medium through the cooling system 2 through the main cooling circuit 6, and then transports the cooled medium back to the heat dissipation device 3 for operation; while another part of the heat dissipation medium in the waste heat branch 7 takes the heat out of the flywheel energy storage system 1 and transports it to the waste heat storage system 4.

[0054] The waste heat storage system 4 stores the waste heat in the heat storage medium of the waste heat storage system 4 and keeps it for power generation; the power generation device 5 uses the heat stored in the heat storage medium and the organic Rankine cycle to achieve the purpose of generating waste heat power by the flywheel energy storage system 1.

[0055] When the flywheel energy storage system 1 is storing energy, electrical energy is input into the generator in the power generation device 5. At this time, the generator operates as an electric motor, driving the flywheel to rotate at high speed, converting electrical energy into rotational energy for storage. When the flywheel energy storage system 1 releases energy, the controller adjusts the speed of the flywheel motor to reduce. At this time, the generator operates as a generator, converting the flywheel kinetic energy into electrical energy for output. During operation, the heat dissipation device 3 in the flywheel energy storage system 1 uses heat dissipation media such as air, water / thermal oil, and phase change fluid to remove heat generated by the flywheel, motor, bearings, etc. through hollow shaft internal flow cooling, housing channel cooling, heat pipe cooling, etc. The heat dissipation media passes through the main cooling circuit 6 and enters the microchannel parallel flow condenser of the cooling system 2, where it is cooled and cooled. It then returns to the heat dissipation device 3 to perform its cooling and heat dissipation functions, ensuring the normal operation of the heat dissipation device 3 and the timely replenishment of the low-temperature heat dissipation media. The heat dissipation medium in the waste heat branch 7 carries the heat out of the flywheel energy storage system 1 along with itself and transports it to the waste heat storage system 4. In the waste heat storage system 4, the heat dissipation medium exchanges the waste heat generated by the flywheel energy storage system 1 with the heat storage medium stored in the waste heat storage system 4, returns itself to a low-temperature state, and is transported back to the heat dissipation system 3 to continue working, thereby recycling the heat dissipation medium while preserving the usable waste heat.

[0056] In the waste heat storage system 4, after the high-temperature heat storage medium obtains the heat released by the heat dissipation medium in the waste heat branch 7, the high-temperature heat storage medium is extracted from the waste heat storage system 4 and enters the power generation device 5, where it releases heat in the heat exchanger of the power generation device 5 to generate steam, driving the generator to generate electricity. The heat used for power generation actually comes from part of the waste heat generated by the flywheel energy storage system 1, that is, the heat carried by the heat dissipation medium entering the waste heat branch 7. After releasing heat in the power generation device 5, the high-temperature heat storage medium is cooled and converted into a low-temperature heat storage medium, which is then transported back to the waste heat storage system 4 for recycling.

[0057] In summary, the power generation mechanism forms a waste heat branch 7 with the heat dissipation device 3 inside the flywheel energy storage system 1 by setting up a waste heat storage system 4, which can effectively recover and store the waste heat generated by the flywheel system, avoid unnecessary loss of energy, and improve the overall energy utilization efficiency; the low-temperature waste heat storage system 4 is connected to the power generation device 5, and the recovered waste heat (including flywheel waste heat and other low-temperature waste heat that may be collected) is used to generate electricity, further tapping the potential value of energy, realizing the cascade utilization of energy, greatly improving the comprehensive utilization efficiency of energy, and breaking through the thermal management limitations of traditional flywheel energy storage systems. A four-in-one energy closed loop of "energy storage-heat dissipation-heat storage-power generation" is constructed, providing a high-efficiency and high-reliability physical energy storage solution for building a new power system.

[0058] In a second aspect, a power system is provided, which includes the flywheel energy storage and waste heat storage power generation mechanism as described above.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art may still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. A flywheel energy storage and waste heat storage power generation mechanism, characterized in that: include: A flywheel energy storage system is internally provided with a heat sink having a plurality of connection ends; a cooling system, one end of which is connected to the first end of the heat sink, and the other end of which is connected to the second end of the heat sink, wherein a main cooling circuit is formed between the cooling system and the heat sink; A waste heat storage system, one end of which is connected to the third end of the heat sink, and the other end of which is connected to the fourth end of the heat sink, wherein a waste heat branch is formed between the waste heat storage system and the heat sink; The power generation device has both ends connected to the waste heat storage system.

2. The flywheel energy storage and waste heat storage power generation mechanism according to claim 1 is characterized in that: The heat dissipation method of the heat dissipation device is one or more of through-flow cooling in the hollow shaft, channel cooling in the shell, or heat pipe cooling.

3. The flywheel energy storage and waste heat storage power generation mechanism according to claim 1 or 2, characterized in that: The heat dissipation device stores a heat dissipation medium, which is water or thermal oil.

4. The flywheel energy storage and waste heat storage power generation mechanism according to claim 1, characterized in that: The cooling system comprises: A microchannel parallel flow condenser is connected to a variable frequency fan.

5. The flywheel energy storage and waste heat storage power generation mechanism according to claim 1 or 4, characterized in that: The pressure drop of the cooling system is equal to or less than 0.2 MPa.

6. The flywheel energy storage and waste heat storage power generation mechanism according to claim 1, characterized in that: The waste heat storage system stores waste heat storage medium.

7. The flywheel energy storage and waste heat storage power generation mechanism according to claim 6, characterized in that: The waste heat storage medium is molten salt.

8. The flywheel energy storage and waste heat storage power generation mechanism according to claim 7, characterized in that: The molten salt is an alkali metal or an alkaline earth metal and one of halides, silicates, carbonates, nitrates and phosphates.

9. The flywheel energy storage and waste heat storage power generation mechanism according to claim 1, characterized in that: The power generation device includes a heat exchanger, and the heat exchanger is connected to a generator through a turbine.

10. A power system, characterized in that: It includes the flywheel energy storage and waste heat storage power generation mechanism as described in any one of claims 1 to 9.

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