Distributed energy storage system and method coupled with micro gas turbine

Abstract

The invention belongs to the technical field of energy storage, and relates to a distributed energy storage system coupled with a micro gas turbine. A micro gas turbine; the heat storage module is used for storing heat in the air; an inlet of the second turbine is connected with an outlet of the heat storage module, and an output shaft of the second turbine is connected with a first generator; the cooling capacity storage module is used for storing the cooling capacity in the air; and the electric energy storage and utilization module is used for storing the electric energy generated by the first generator at the electricity consumption trough and transmitting the electric energy generated by the first generator and the stored electric energy to a power grid at the electricity consumption peak. According to the system, heat and cold can be stored while electric energy is stored, efficient storage and utilization of unstable electric energy generated by renewable energy power generation are achieved, the problem of power grid fluctuation caused by direct grid connection is avoided, reliable electric power, heating power and cold power supply is provided for rural areas, and the utilization efficiency of renewable energy is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and relates to a distributed energy storage system and method coupled with a micro gas turbine. Background Art

[0002] The demand for energy in rural areas is becoming increasingly diversified, covering various forms such as electricity and thermal energy. Renewable energy, such as solar energy and wind energy, provides a rich source of energy for rural areas. These energy sources are not only renewable, but also widely distributed. Especially in rural areas, solar energy and wind energy resources are particularly abundant. By utilizing these renewable energy sources, rural areas can meet their own energy needs and reduce their dependence on external energy. However, with the large-scale application of renewable energy, the intermittent and unstable problems of energy are becoming increasingly prominent.

[0003] At present, renewable energy power generation mostly uses energy storage systems coupled with micro gas turbines in terms of energy storage. The energy storage systems coupled with micro gas turbines can smooth out fluctuations caused by the intermittent and unstable nature of renewable energy on the power grid, thereby reducing the impact on the power grid.

[0004] However, since the energy storage systems coupled with micro gas turbines are mostly designed for a single power supply, they lack consideration of multiple application scenarios and multi-energy cogeneration capabilities, resulting in low efficiency in the storage and utilization of unstable electricity generated by renewable energy generation. This not only affects the utilization efficiency of renewable energy, but also makes it difficult to provide other forms of energy for rural areas. Summary of the invention

[0005] The purpose of the present invention is to provide a distributed energy storage system and method coupled with a micro gas turbine, which can store heat and cold while storing electric energy, not only realizing the efficient storage and utilization of the unstable electric energy generated by renewable energy generation, but also providing reliable electricity, heat and cold supply for rural areas.

[0006] To achieve the above purpose, the technical solution provided by the present invention is as follows: A distributed energy storage system coupled with a micro gas turbine, comprising: Renewable energy power generation equipment uses renewable energy to generate electricity.

[0007] The micro gas turbine comprises a compressor, a first turbine and a heating element. The inlet of the compressor is used to introduce air at normal temperature and pressure. The outlet of the compressor is connected to the inlet of the heating element. The outlet of the heating element is connected to the inlet of the first turbine. The heating element is electrically connected to a renewable energy power generation device. The heating element is used to heat the compressed air.

[0008] The heat storage module has an inlet connected to the outlet of the first turbine and is used for storing heat in the air.

[0009] The inlet of the second turbine is connected to the outlet of the heat storage module, the output shaft of the second turbine is connected to the first generator, and the output shafts of the first turbine and the second turbine are coaxially connected to the driving shaft of the compressor.

[0010] The cold storage module has an inlet connected to the outlet of the second turbine and is used to store cold energy in the air.

[0011] The electric energy storage and utilization module is used to store the electric energy generated by the first generator when the electricity consumption is low, and transmit the electric energy generated by the first generator and the stored electric energy to the power grid when the electricity consumption is peak.

[0012] The present invention is also characterized in that: The heat storage module includes: The first inlet of the high-temperature heat exchanger is connected to the outlet of the first turbine, and the first outlet of the high-temperature heat exchanger is connected to the inlet of the second turbine.

[0013] The heat storage tank stores heat storage medium therein, the outlet of the heat storage tank is connected to the second inlet of the high-temperature heat exchanger, and the inlet of the heat storage tank is connected to the second outlet of the high-temperature heat exchanger.

[0014] The cold storage module includes: The first inlet of the low-temperature heat exchanger is connected to the outlet of the second turbine, and the first outlet of the low-temperature heat exchanger is connected to the atmosphere.

[0015] The cold storage tank stores cold storage medium therein, the first outlet of the cold storage tank is connected to the second inlet of the low-temperature heat exchanger, and the first inlet of the cold storage tank is connected to the second outlet of the low-temperature heat exchanger.

[0016] The electric energy storage and utilization module includes: At least one energy storage tank storing nitrogen gas therein.

[0017] A water storage tank stores water at normal temperature and pressure.

[0018] The first water pump has an inlet connected to the first outlet of the water storage tank, and its outlet is respectively connected to the first inlet and the second inlet of the energy storage tank. The first water pump is electrically connected to the first generator. The first water pump is used to pressurize the normal temperature and pressure water in the water storage tank into normal temperature and high pressure water and transport it to the energy storage tank.

[0019] The energy release component is connected to the energy storage tank and is used to convert the pressure energy in the stored high-pressure water at normal temperature into electrical energy and transmit it to the power grid during peak electricity consumption.

[0020] The energy release components include: The inlet of the water turbine is connected to the outlet of the energy storage tank, the outlet of the water turbine is connected to the first inlet of the water storage tank, the output end of the water turbine is connected to the second generator, and the electric energy generated by the second generator is transmitted to the power grid.

[0021] Preheater, connected to renewable energy power generation equipment.

[0022] The inlet of the second water pump is connected to the second outlet of the water storage tank, and the outlet of the second water pump is connected to the inlet of the preheater.

[0023] The heat exchanger is arranged on the energy storage tank, and the inlet is connected with the outlet of the preheater.

[0024] The outlet of the heat exchanger is connected to the second inlet of the cold storage tank, and the second outlet of the cold storage tank is connected to the second inlet of the water storage tank.

[0025] A distributed energy storage method coupled with a micro gas turbine comprises the following steps: Air at normal temperature and pressure is introduced into the compressor for pressurization, so that the air at normal temperature and pressure becomes high-temperature and high-pressure air.

[0026] High-temperature and high-pressure air is introduced into the heating element, and the electric energy generated by the renewable energy power generation equipment is used to power the heating element. The heating element heats the high-temperature and high-pressure air, turning the high-temperature and high-pressure air into ultra-high-temperature and high-pressure air.

[0027] The ultra-high temperature and high pressure air is introduced into the first turbine to expand and do work, and the ultra-high temperature and high pressure air becomes high temperature and medium pressure air. The heat in the high temperature and medium pressure air is stored in the heat storage module, and the high temperature and medium pressure air becomes normal temperature and medium pressure air.

[0028] Normal temperature medium pressure air is introduced into the second turbine to expand and do work, and the normal temperature medium pressure air becomes low temperature normal pressure air. The cold energy in the low temperature normal pressure air is stored in the cold energy storage module, and the low temperature normal pressure air becomes normal temperature normal pressure air and is discharged.

[0029] When electricity consumption is low, the first turbine and the second turbine drive the first generator to generate electricity, which is stored in the electric energy storage and utilization module. When electricity consumption is peak, the first turbine and the second turbine drive the first generator to generate electricity, which is directly transmitted to the power grid. At the same time, the electric energy stored in the electric energy storage and utilization module is transmitted to the power grid.

[0030] When the electricity consumption is low, the specific steps of storing the electric energy generated by the first generator driven by the first turbine and the second turbine through the electric energy storage and utilization module are as follows: The electric energy generated by the first generator driven by the first turbine and the second turbine is transmitted to the first water pump, and the first water pump is started. The first water pump pressurizes the normal temperature and pressure water in the water tank and converts it into normal temperature and high pressure water. A part of the high temperature and high pressure water enters the water tank through the first inlet of the water tank for storage, and the other part of the high temperature and high pressure water enters the water tank through the second inlet of the water tank for spraying operation, so as to cool the nitrogen and compress it isothermally.

[0031] During peak hours of electricity consumption, the specific steps for transmitting the electric energy stored in the electric energy storage and utilization module to the power grid are as follows: The normal temperature and high pressure water in the energy storage tank is introduced into the turbine, and the turbine drives the second generator to generate electricity and transmit it to the power grid. The normal temperature and high pressure water is converted into normal temperature and pressure water and returns to the water storage tank.

[0032] Start the second water pump, which introduces the normal temperature water in the water storage tank into the preheater. The low-grade heat generated by renewable energy heats the normal temperature and pressure water, so that the normal temperature and pressure water becomes high-temperature and normal pressure water. The high-temperature and normal pressure water enters the heat exchanger to exchange heat with the expanding and cooled nitrogen, so that the nitrogen maintains isothermal expansion and the high-temperature and normal pressure water becomes low-temperature and normal pressure water.

[0033] The low-temperature and normal-pressure water is introduced into the heat storage tank, and the cold energy is stored in the heat storage tank and then converted into normal-temperature and normal-pressure water and returned to the water storage tank.

[0034] The temperature of normal temperature and normal pressure air is 15℃~25℃, and the pressure is 1bar, the temperature of high temperature and high pressure air is 150℃~300℃, and the pressure is 2bar~6bar, the temperature of ultra-high temperature and high pressure air is 650℃~1200℃, and the pressure is 2bar~6bar, the temperature of high temperature and medium pressure air is 150℃~300℃, and the pressure is 1.2bar~3bar, the temperature of normal temperature and medium pressure air is 25℃~50℃, and the pressure is 1.2bar~3bar, the temperature of low temperature and normal pressure air is -10℃~15℃, and the pressure is 1bar, the temperature of normal temperature and high pressure water is 20℃~30℃, and the pressure is 10bar~200bar, the temperature of high temperature and normal pressure water is 60℃~90℃, and the pressure is 1bar, and the temperature of low temperature and normal pressure water is 0℃~15℃, and the pressure is 1bar.

[0035] A distributed energy storage system and method coupled with a micro gas turbine of the present invention has the following advantages: First, through the coordination of the micro gas turbine, the second turbine, the heat storage module, the cold storage module and the electric energy storage and utilization module, it is possible to store heat and cold while storing electric energy, which not only realizes the efficient storage and utilization of the unstable electric energy generated by renewable energy power generation, avoids the grid fluctuation problems caused by direct grid connection, but also provides reliable electricity, heat and cold supply for rural areas, improving the utilization efficiency of renewable energy.

[0036] Second, the present invention is centered on a micro gas turbine, which is small in size, light in weight, and compact in structure, making it particularly suitable for distributed deployment. The distributed design can fully adapt to scenarios with dispersed energy demands such as rural areas and small factories. The system does not need to rely on large-scale centralized energy storage equipment, nor does it require special terrain conditions. It can be independently deployed in multiple distributed nodes such as villages, towns, and factories, achieving flexible layout on demand and rapid response to local energy demands.

[0037] Third, the present invention can provide stable energy input by combining unstable electric energy generated by micro gas turbines with renewable energy, and utilize air in the external atmosphere as the working medium. It does not require high-pressure storage tanks or electrochemical energy storage devices. The distributed operation mode not only reduces construction complexity and investment costs, but also enables each node to have the ability to operate independently, thus maintaining a reliable supply of local energy even when a centralized power grid fails.

[0038] Fourth, the present invention adopts a modular design. Key equipment such as energy storage tanks and heat exchangers are compact structures. Energy storage tanks can be flexibly arranged and can be buried underground or installed in a dispersed manner, which greatly reduces the occupation of ground space and improves the concealment and safety of the equipment. The modular design also allows the system to flexibly expand capacity according to actual needs and adapt to fluctuations in energy demand in different regions.

[0039] Fifth, the present invention uses a distributed energy storage system to flexibly adjust the energy release capacity during peak electricity consumption, and uses a micro gas turbine and air turbine to generate electricity, in conjunction with heat and cold storage equipment, to achieve a comprehensive supply of electricity, heat and cold energy. This distributed energy supply method is particularly suitable for the diversified energy needs of rural areas and small factories, providing users with a reliable and efficient comprehensive energy solution.

[0040] Sixth, the present invention can make full use of the characteristics of unstable electric energy in renewable energy (such as photovoltaic and wind power generation), convert it into stored heat energy, cold energy and potential energy, and avoid the grid fluctuation problems that may be caused by direct grid connection. At the same time, under the operation of distributed nodes, each micro gas turbine can independently cooperate with renewable energy to achieve efficient energy conversion and consumption, further optimize the energy structure, and increase the proportion of clean energy in the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0042] Figure 2 It is a schematic diagram of the overall process structure of the present invention.

[0043] Figure 3 It is a schematic diagram of the energy release process structure of the present invention.

[0044] Reference numerals: 1. Renewable energy power generation equipment, 2. Compressor, 3. Air heater, 4. First turbine, 5. High-temperature heat exchanger, 6. Heat storage tank, 7. Second turbine, 8. Low-temperature heat exchanger, 9. Cold storage tank, 10. First water pump, 11. Energy storage tank, 12. Heat exchanger, 13. Turbine, 14. Water storage tank, 15. Second water pump, 16. Preheater, 17. Electric heater, 18. First control valve, 19. Second control valve, 20. Third control valve, 21. Fourth control valve, 22. Fifth control valve, 23. Sixth control valve, 24. Seventh control valve, 25. Eighth control valve, 26. Ninth control valve, 27. Tenth control valve, 28. First generator, 29. Second generator. DETAILED DESCRIPTION

[0045] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, such as A and / or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two. The following terms "first" and "second" are used for descriptive purposes only and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0046] like Figure 1As shown, the present invention provides a distributed energy storage system and method coupled with a micro gas turbine, comprising a micro gas turbine, a second turbine 7, a heat storage module, a cold storage module and an electric energy storage and utilization module, a renewable energy power generation device 1, which utilizes renewable energy to generate electricity, such as photovoltaic power generation, wind power generation, etc. The micro gas turbine comprises a compressor 2, a first turbine 4 and a heating element, the inlet of the compressor 2 is used to introduce air at normal temperature and pressure, and compress the air at normal temperature and pressure, the outlet of the compressor 2 is connected to the inlet of the heating element, the outlet of the heating element is connected to the inlet of the first turbine 4, the heating element is electrically connected to the renewable energy power generation device 1, the heating element is used to heat the compressed air, the inlet of the heat storage module is connected to the outlet of the first turbine 4, the heat storage module is used to store heat in the air, the inlet of the second turbine 7 is connected to the outlet of the heat storage module, the output shaft of the second turbine 7 is connected to the first generator 28, the output shaft of the first turbine 4, the output shaft of the second turbine 7, the drive shaft of the compressor 2 and the drive shaft of the first generator 28 are coaxially connected, In the initial stage, only a small amount of electric energy is needed to drive the compressor 2 to operate. After the entire system is running, the first turbine 4 and the second turbine 7 can drive the first motor to rotate and generate electricity during the rotation process, and drive the compressor 2 to rotate to provide kinetic energy for the operation of the compressor 2. The inlet of the cold storage module is connected to the outlet of the second turbine 7. The cold storage module is used to store the cold in the air, that is, the cold generated by the expansion work of the second turbine 7. The electric energy storage and utilization module is used to store the electric energy generated by the first generator 28 when the power consumption is low, and transmit the electric energy generated by the first generator 28 and the stored electric energy to the power grid when the power consumption is peak. Through the cooperation of the micro gas turbine, the second turbine 7, the heat storage module, the cold storage module and the electric energy storage and utilization module, heat and cold can be stored while storing electric energy, which not only realizes the efficient storage and utilization of the unstable electric energy generated by renewable energy power generation, avoids the power grid fluctuation problem caused by direct grid connection, but also provides reliable power, heat and cold supply for rural areas, and improves the utilization efficiency of renewable energy.

[0047] like Figure 1 As shown, based on the micro gas turbine, a compressor 2, a first turbine 4 and a heating element are used to replace the original micro gas turbine, so as to directly utilize the electric energy generated by the renewable energy power generation equipment 1 to replace the original combustible gas combustion, thereby avoiding the waste and pollution caused by the use of non-renewable energy.

[0048] like Figure 1As shown, the heating element is composed of an air heater 3 and an electric heater 17. The inlet of the air heater 3 is connected to the outlet of the compressor 2, the outlet of the air heater 3 is connected to the inlet of the first turbine 4, the electric heater 17 is electrically connected to the renewable energy power generation device 1, the electric energy generated by the renewable energy power generation device 1 is used to power the electric heater 17, and the heat generated by the operation of the electric heater 17 is supplied to the air heater 3 to heat the compressed air in the air heater 3.

[0049] like Figure 1 As shown, the heat storage module includes a high-temperature heat exchanger 5 and a heat storage tank 6, the first inlet of the high-temperature heat exchanger 5 is connected to the outlet of the first turbine 4, the first outlet of the high-temperature heat exchanger 5 is connected to the inlet of the second turbine 7, the heat storage tank 6 stores a heat storage medium, the outlet of the heat storage tank 6 is connected to the second inlet of the high-temperature heat exchanger 5, and the inlet of the heat storage tank 6 is connected to the second outlet of the high-temperature heat exchanger 5.

[0050] like Figure 1 As shown, the cold storage module includes a low-temperature heat exchanger 8 and a cold storage tank 9. The first inlet of the low-temperature heat exchanger 8 is connected to the outlet of the second turbine 7, and the first outlet of the low-temperature heat exchanger 8 is connected to the atmosphere, so as to discharge the air at normal temperature and pressure into the atmosphere, and utilize the air at normal temperature and pressure in the external atmosphere as the working medium, without the need for a high-pressure storage tank or an electrochemical energy storage device. The cold storage tank 9 stores cold storage medium, and the first outlet of the cold storage tank 9 is connected to the second inlet of the low-temperature heat exchanger 8, and the first inlet of the cold storage tank 9 is connected to the second outlet of the low-temperature heat exchanger 8.

[0051] like Figure 1As shown, the electric energy storage and utilization module includes at least one energy storage tank 11, a water storage tank 14, a first water pump 10 and an energy release component. Nitrogen is stored in at least one energy storage tank 11. The number of energy storage tanks 11 can be arranged as needed. Normal temperature and normal pressure water is stored in the water storage tank 14. The inlet of the first water pump 10 is connected to the first outlet of the water storage tank 14. The outlet of the first water pump 10 is respectively connected to the first inlet and the second inlet of the energy storage tank 11. The first inlet is located at the lower part of the energy storage tank 11, and the second inlet is located at the upper part of the energy storage tank 11 and is provided with a spray structure. The first water pump 10 is electrically connected to the first generator 28. The first water pump 10 is used to pressurize the normal temperature and normal pressure water in the water storage tank 14 into normal temperature and high pressure water and transport it to the energy storage tank 11. A part of the normal temperature and high pressure water directly enters the energy storage tank 11 for storage During the storage process, the normal temperature and high pressure water will compress the nitrogen, and another part of the normal temperature and high pressure water is used to cool the nitrogen. This part of the normal temperature and high pressure water enters the spray structure through the second inlet, and is sprayed into the energy storage tank 11 through the spray structure to cool the compressed nitrogen therein. The energy release component is connected to the energy storage tank 11. The energy release component is used to convert the pressure energy in the stored normal temperature and high pressure water into electrical energy during peak power consumption and transmit it to the power grid. The main purpose of setting nitrogen is to provide a buffering effect for the high pressure water, mainly from the perspective of safety. Nitrogen has good compressibility and can play a buffering role when pressure fluctuations occur in the energy storage tank 11, reducing the risk of system explosion and stress concentration. In addition, directly storing normal temperature and high pressure water will produce a large impact force on the energy storage tank 11. The buffering effect of nitrogen can extend the service life of the energy storage tank 11.

[0052] like Figure 1 As shown, the energy release component includes a turbine 13, a preheater 16, a second water pump 15 and a heat exchanger 12. The inlet of the turbine 13 is connected to the outlet of the energy storage tank 11, and the outlet of the turbine 13 is connected to the first inlet of the water storage tank 14. The output end of the turbine 13 is connected to the second generator 29, and the second generator 29 is driven by the rotation of the turbine 13 to generate electricity. The electric energy generated by the second generator 29 is transmitted to the power grid. The preheater 16 is connected to the renewable energy power generation equipment 1. The preheater 16 is used to receive low-grade heat generated by the renewable energy power generation equipment 1. Low-grade heat refers to heat energy generated in the energy conversion process with low quality or difficult to directly use. The inlet of the second water pump 15 is connected to the second outlet of the water storage tank 14, and the outlet of the second water pump 15 is connected to the inlet of the preheater 16. The heat exchanger 12 is arranged on the energy storage tank 11, and the inlet of the heat exchanger 12 is connected to the outlet of the preheater 16.

[0053] like Figure 1As shown, the inlet of the compressor 1 is provided with a first control valve 18, which is connected to the atmosphere by opening and closing the first control valve 18, the outlet of the first water pump 10 is provided with a second control valve 19, the first inlet of the energy storage tank 11 is provided with a third control valve 20, and the second inlet of the energy storage tank 11 is provided with a fourth control valve 21, and the flow rate of the normal temperature and high pressure water for compressing the nitrogen and the flow rate of the normal temperature and high pressure water for spraying the nitrogen are respectively controlled by the third control valve 20 and the fourth control valve 21, and the energy storage tank 11 is provided with two outlets, which are the first outlet and the second outlet respectively. A fifth control valve 22 is provided at the first outlet of the energy storage tank 11, and a sixth control valve 23 is provided at the second outlet of the energy storage tank 11. The flow rate of water is controlled by the fifth control valve 22 and the sixth control valve 23. A seventh control valve 24 is provided at the inlet of the heat exchanger 12. The flow rate of high-temperature and normal-pressure water entering the heat exchanger 12 is controlled by the seventh control valve 24. An eighth control valve 25 is provided at the second inlet of the water storage tank 14, and a ninth control valve 26 is provided at the second outlet of the water storage tank 14. A tenth control valve 27 is provided at the inlet of the preheater 16.

[0054] like Figure 1 As shown, the outlet of the heat exchanger 12 is connected to the second inlet of the cold storage tank 9 , and the second outlet of the cold storage tank 9 is connected to the second inlet of the water storage tank 14 .

[0055] like Figure 2 As shown, the present invention also provides a distributed energy storage method coupled with a micro gas turbine, comprising the following steps: Air at normal temperature and pressure is introduced into compressor 2 for pressurization, so that the air at normal temperature and pressure becomes high-temperature and high-pressure air.

[0056] High-temperature and high-pressure air is introduced into the heating element, and the electric energy generated by the renewable energy power generation equipment 1 is used to power the heating element. The heating element heats the high-temperature and high-pressure air, so that the high-temperature and high-pressure air becomes ultra-high-temperature and high-pressure air.

[0057] The ultra-high temperature and high pressure air is introduced into the first turbine 4 to expand and do work, and the ultra-high temperature and high pressure air becomes high temperature and medium pressure air. The heat in the high temperature and medium pressure air is stored in the heat storage module through the heat storage module, and the high temperature and medium pressure air becomes normal temperature and medium pressure air.

[0058] Normal temperature medium pressure air is introduced into the second turbine 7 to expand and do work, and the normal temperature medium pressure air becomes low temperature normal pressure air. The cold energy in the low temperature normal pressure air is stored in the cold energy storage module, and the low temperature normal pressure air becomes normal temperature normal pressure air and is discharged.

[0059] When electricity consumption is low, the first turbine 4 and the second turbine 7 drive the first generator 28 to generate electricity, which is stored in the electric energy storage and utilization module. When electricity consumption is peak, the first turbine 4 and the second turbine 7 drive the first generator 28 to generate electricity, which is directly transmitted to the power grid. At the same time, the electric energy stored in the electric energy storage and utilization module is transmitted to the power grid.

[0060] like Figure 2 As shown, when the electricity consumption is low, the first turbine 4 and the second turbine 7 drive the first generator 28 to generate electricity, and the specific steps of storing the electricity through the electric energy storage and utilization module are as follows: The electric energy generated by the first generator 28 driven by the first turbine 4 and the second turbine 7 is transmitted to the first water pump 10, and the first water pump 10 is started. The first water pump 10 pressurizes the water at normal temperature and pressure in the water tank 14 to convert it into water at normal temperature and high pressure. A part of the high temperature and high pressure water enters the water tank 14 through the first inlet of the water tank 14 for storage, and another part of the high temperature and high pressure water enters the water tank 14 through the second inlet of the water tank 14 for spraying operation, so as to cool the nitrogen and compress the nitrogen isothermally.

[0061] like Figure 3 As shown, during peak hours of electricity consumption, the specific steps for transmitting the electric energy stored in the electric energy storage and utilization module to the power grid are as follows: The normal temperature and high pressure water in the energy storage tank 11 is introduced into the turbine 13 , and the turbine 13 drives the second generator 29 to generate electricity and transmit the generated electricity to the power grid, and the normal temperature and high pressure water is converted into normal temperature and normal pressure water and returns to the water storage tank 14 .

[0062] The second water pump 15 is started, and the second water pump 15 introduces the normal temperature water in the water storage tank 14 into the preheater 16. The normal temperature and pressure water is heated by the low-grade heat generated by the renewable energy power generation equipment 1, so that the normal temperature and pressure water is changed into high temperature and pressure water. The high temperature and pressure water enters the heat exchanger 12 to exchange heat with the nitrogen gas that is expanding and cooling, so that the nitrogen gas maintains isothermal expansion, and the high temperature and pressure water is changed into low temperature and pressure water.

[0063] The low-temperature and normal-pressure water is introduced into the heat storage tank 6 , and the cold energy is stored in the heat storage tank 6 and then converted into normal-temperature and normal-pressure water and returned to the water storage tank 14 .

[0064] Among them, the temperature of normal temperature and pressure air is 15℃~25℃ and the pressure is 1bar, the temperature of high temperature and high pressure air is 150℃~300℃ and the pressure is 2bar~6bar, the temperature of ultra-high temperature and high pressure air is 650℃~1200℃ and the pressure is 2bar~6bar, the temperature of high temperature and medium pressure air is 150℃~300℃ and the pressure is 1.2bar~3bar, the temperature of normal temperature and medium pressure air is 25℃~50℃ and the pressure is 1.2bar~3bar, and the temperature of low temperature and normal pressure air is 25℃~50℃ and the pressure is 1.2bar~3bar. The temperature of the air is -10℃~15℃ and the pressure is 1bar, the temperature of normal temperature and high pressure water is 20℃~30℃ and the pressure is 10bar~200bar, the temperature of high temperature and normal pressure water is 60℃~90℃ and the pressure is 1bar, the temperature of low temperature and normal pressure water is 0℃~15℃ and the pressure is 1bar, the initial temperature of the heat storage medium is 50℃~100℃ and the maximum temperature is 300℃~500℃, the initial temperature of the cold storage medium is 5℃~10℃ and the minimum temperature is -5℃~-10℃.

[0065] Working principle: In the initial state, all the first control valves 18 to the tenth control valves 27 are closed, and the device is in a shutdown state.

[0066] When the user is in the low electricity consumption period, the fifth control valve 22, the sixth control valve 23, the seventh control valve 24, the eighth control valve 25, the ninth control valve 26, and the tenth control valve 27 are closed, and the first control valve 18, the second control valve 19, the third control valve 20, and the fourth control valve 21 are opened, and the energy storage part starts to work. The air at normal temperature and pressure in the atmosphere enters the compressor 2 for pressurization, so that the air at normal temperature and pressure becomes high-temperature and high-pressure air, and the high-temperature and high-pressure air enters the air heater 3. The electric energy generated by the renewable energy power generation equipment 1 is used to power the electric heater 17, and the heat generated by the operation of the electric heater 17 is supplied to the air heater 3, so that the high-temperature and high-pressure air becomes ultra-high-temperature and high-pressure air, and the ultra-high-temperature and high-pressure air becomes ultra-high-temperature and high-pressure air. High-temperature and high-pressure air enters the first turbine 4 to generate electricity, and the ultra-high-temperature and high-pressure air becomes high-temperature medium-pressure air. The high-temperature medium-pressure air enters the high-temperature heat exchanger 5 to exchange heat with the heat storage medium from the heat storage tank 6. The high-temperature medium-pressure air becomes normal-temperature medium-pressure air. The heat storage medium enters the heat storage tank 6 for storage for use in rural agriculture, rural factories and central heating. The normal-temperature medium-pressure air enters the second turbine 7 to generate electricity, and the normal-temperature medium-pressure air becomes low-temperature and normal-pressure air. The low-temperature and normal-pressure air enters the low-temperature heat exchanger 8 to exchange heat with the cold storage medium from the cold storage tank 9. The low-temperature and normal-pressure air becomes normal-temperature and normal-pressure air and is discharged. The cold storage medium returns to the cold storage tank 9 for storage for use in the cold chain industry, etc.

[0067] The first turbine 4 and the second turbine 7 drive the first generator 28 to generate electricity and transmit the electric energy to the first water pump 10, and the first water pump 10 is started. The first water pump 10 pressurizes the normal temperature and normal pressure water in the water storage tank 14 into normal temperature and high pressure water and transmits it to the energy storage tank 11. A part of the normal temperature and high pressure water enters the energy storage tank 11 through the first inlet of the energy storage tank 11 for storage, and the nitrogen is compressed during the storage process. The other part of the normal temperature and high pressure water enters the spray structure through the second inlet of the energy storage tank 11, and the high pressure water is sprayed into the energy storage tank 11 through the spray structure to perform a spray operation, so as to cool the compressed nitrogen so that the nitrogen can be isothermally compressed.

[0068] When the user is at the peak of electricity consumption, the second control valve 19 and the fourth control valve 21 are closed, and the first control valve 18, the fifth control valve 22, the sixth control valve 23, the seventh control valve 24, the eighth control valve 25, the ninth control valve 26, and the tenth control valve 27 are opened. The energy release part starts to work, and the compressor 2, the air heater 3, the electric heater 17, the first turbine 4, and the second turbine 7 continue to work, converting the unstable electric energy generated by the renewable energy power generation equipment 1 into stable electric energy, and directly transmitting the stable electric energy to the power grid, and stopping supplying power to the first water pump 10.

[0069] The first water pump 10 stops working, and the normal temperature and high pressure water in the energy storage tank 11 is introduced into the turbine 13 to drive the turbine 13 to generate electricity. The electricity generated by the second generator 29 driven by the turbine 13 is transmitted to the power grid, and the normal temperature and high pressure water becomes normal temperature and pressure water and returns to the water storage tank 14. At the same time, the electricity generated by the renewable energy power generation equipment 1 is used to power the second water pump 15, and the second water pump 15 is started. The second water pump 15 introduces the normal temperature water in the water storage tank 14 into the preheater 16, and the normal temperature and pressure water is heated by the low-grade heat generated by the renewable energy power generation equipment 1, so that the normal temperature and pressure water is changed into high temperature and pressure water. The high temperature and pressure water enters the heat exchanger 12 to exchange heat with the nitrogen gas that is expanding and cooling, so that the nitrogen gas maintains isothermal expansion, and the high temperature and pressure water is changed into low temperature and pressure water. The low temperature and pressure water is introduced into the heat storage tank 6, and the cold energy is stored in the heat storage tank 6 and then changed into normal temperature and pressure water and returns to the water storage tank 14, completing the energy release process.

[0070] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A distributed energy storage system coupled with a micro gas turbine, characterized in that: include: Renewable energy generation equipment (1), generating electricity using renewable energy; A micro gas turbine comprises a compressor (2), a first turbine (4) and a heating element, wherein the inlet of the compressor (2) is used to introduce air at normal temperature and pressure, the outlet of the compressor (2) is connected to the inlet of the heating element, the outlet of the heating element is connected to the inlet of the first turbine (4), the heating element is electrically connected to a renewable energy power generation device (1), and the heating element is used to heat the compressed air; a heat storage module, the inlet of which is connected to the outlet of the first turbine (4) and is used to store heat in the air; a second turbine (7), the inlet of which is connected to the outlet of the heat storage module, the output shaft of the second turbine (7) being connected to the first generator (28), the output shafts of the first turbine (4) and the second turbine (7) being coaxially connected to the drive shaft of the compressor (2); A cold storage module, the inlet of which is connected to the outlet of the second turbine (7), and is used to store cold energy in the air; The electric energy storage and utilization module is used to store the electric energy generated by the first generator (28) when the power consumption is low, and to transmit the electric energy generated by the first generator (28) and the stored electric energy to the power grid when the power consumption is high.

2. A distributed energy storage system coupled with a micro gas turbine according to claim 1, characterized in that: The heat storage module comprises: A high-temperature heat exchanger (5), wherein a first inlet is connected to an outlet of a first turbine (4), and a first outlet of the high-temperature heat exchanger (5) is connected to an inlet of a second turbine (7); A heat storage tank (6) stores a heat storage medium therein, wherein the outlet of the heat storage tank (6) is connected to the second inlet of the high-temperature heat exchanger (5), and the inlet of the heat storage tank (6) is connected to the second outlet of the high-temperature heat exchanger (5).

3. A distributed energy storage system coupled with a micro gas turbine according to claim 1, characterized in that: The cold storage module comprises: A low-temperature heat exchanger (8), wherein a first inlet is connected to an outlet of the second turbine (7), and a first outlet of the low-temperature heat exchanger (8) is connected to the atmosphere; A cold storage tank (9) stores a cold storage medium therein, wherein a first outlet of the cold storage tank (9) is connected to a second inlet of the low-temperature heat exchanger (8), and a first inlet of the cold storage tank (9) is connected to a second outlet of the low-temperature heat exchanger (8).

4. A distributed energy storage system coupled with a micro gas turbine according to claim 3, characterized in that: The electric energy storage and utilization module comprises: at least one energy storage tank (11) storing nitrogen gas therein; A water storage tank (14) storing water at normal temperature and pressure; a first water pump (10), the inlet of which is connected to the first outlet of the water storage tank (14); the outlet of the first water pump (10) is respectively connected to the first inlet and the second inlet of the energy storage tank (11); the first water pump (10) is electrically connected to a first generator (28); the first water pump (10) is used to pressurize the water at normal temperature and pressure in the water storage tank (14) to convert it into normal temperature and high pressure water and transport it to the energy storage tank (11); The energy release component is connected to the energy storage tank (11) and is used to convert the pressure energy in the stored high-pressure water at normal temperature into electrical energy and transmit it to the power grid during peak electricity consumption.

5. A distributed energy storage system coupled with a micro gas turbine according to claim 4, characterized in that: The energy release component comprises: The inlet of the water turbine (13) is connected to the outlet of the energy storage tank (11), the outlet of the water turbine (13) is connected to the first inlet of the water storage tank (14), the output end of the water turbine (13) is connected to a second generator (29), and the electric energy generated by the second generator (29) is transmitted to the power grid; A preheater (16) connected to the renewable energy power generation device (1); A second water pump (15), the inlet of which is connected to the second outlet of the water storage tank (14), and the outlet of the second water pump (15) is connected to the inlet of the preheater (16); The heat exchanger (12) is arranged on the energy storage tank (11), and the inlet is connected to the outlet of the preheater (16).

6. A distributed energy storage system coupled with a micro gas turbine according to claim 5, characterized in that: The outlet of the heat exchanger (12) is connected to the second inlet of the cold storage tank (9), and the second outlet of the cold storage tank (9) is connected to the second inlet of the water storage tank (14).

7. A distributed energy storage method coupled with a micro gas turbine, characterized in that: A distributed energy storage system coupled with a micro gas turbine as claimed in claim 6 comprises the following steps: Introducing air at normal temperature and pressure into the compressor (2) for pressurization, so that the air at normal temperature and pressure becomes high-temperature and high-pressure air; Introducing high-temperature and high-pressure air into a heating element, the electric energy generated by the renewable energy power generation device (1) is used to power the heating element, and the heating element heats the high-temperature and high-pressure air, so that the high-temperature and high-pressure air becomes ultra-high-temperature and high-pressure air; Introducing ultra-high temperature and high pressure air into the first turbine (4) to expand and perform work, the ultra-high temperature and high pressure air becomes high temperature and medium pressure air, and storing heat in the high temperature and medium pressure air in the heat storage module through the heat storage module, so that the high temperature and medium pressure air becomes normal temperature and medium pressure air; Introducing normal temperature medium pressure air into the second turbine (7) to expand and perform work, the normal temperature medium pressure air becomes low temperature normal pressure air, the cold energy in the low temperature normal pressure air is stored in the cold energy storage module, and the low temperature normal pressure air becomes normal temperature normal pressure air and is discharged; When electricity consumption is low, the first turbine (4) and the second turbine (7) drive the first generator (28) to generate electricity, which is stored in the electricity storage and utilization module. When electricity consumption is high, the first turbine (4) and the second turbine (7) drive the first generator (28) to generate electricity, which is directly transmitted to the power grid. At the same time, the electricity stored in the electricity storage and utilization module is transmitted to the power grid.

8. A distributed energy storage method coupled with a micro gas turbine according to claim 7, characterized in that: When electricity consumption is low, the first turbine (4) and the second turbine (7) drive the first generator (28) to generate electricity, and the specific steps of storing the electricity through the electric energy storage and utilization module are as follows: The electric energy generated by the first generator (28) driven by the first turbine (4) and the second turbine (7) is transmitted to the first water pump (10), and the first water pump (10) is started. The first water pump (10) pressurizes the water at normal temperature and pressure in the water storage tank (14) to convert it into normal temperature and high pressure water. A portion of the high temperature and high pressure water enters the water storage tank (14) through the first inlet of the water storage tank (14) for storage, and another portion of the high temperature and high pressure water enters the water storage tank (14) through the second inlet of the water storage tank (14) for spraying operation, thereby cooling the nitrogen and isothermally compressing the nitrogen.

9. A distributed energy storage method coupled with a micro gas turbine according to claim 8, characterized in that: During peak hours of electricity consumption, the specific steps for transmitting the electric energy stored in the electric energy storage and utilization module to the power grid are as follows: The normal temperature and high pressure water in the energy storage tank (11) is introduced into the turbine (13), the turbine (13) drives the second generator (29) to generate electricity and transmit the generated electricity to the power grid, and the normal temperature and high pressure water is converted into normal temperature and normal pressure water and returns to the water storage tank (14); The second water pump (15) is started, and the second water pump (15) introduces the normal temperature water in the water storage tank (14) into the preheater (16). The normal temperature and pressure water is heated by the low-grade heat generated by the renewable energy power generation equipment (1), so that the normal temperature and pressure water is converted into high temperature and pressure water. The high temperature and pressure water enters the heat exchanger (12) and exchanges heat with the nitrogen gas that is expanding and cooling, so that the nitrogen gas maintains isothermal expansion, and the high temperature and pressure water is converted into low temperature and pressure water. Low-temperature and normal-pressure water is introduced into the heat storage tank (6), and the cold energy is stored in the heat storage tank (6) and then converted into normal-temperature and normal-pressure water and returned to the water storage tank (14).

10. A distributed energy storage method coupled with a micro gas turbine according to claim 9, characterized in that: The temperature of the normal temperature and normal pressure air is 15℃~25℃, and the pressure is 1bar, the temperature of the high temperature and high pressure air is 150℃~300℃, and the pressure is 2bar~6bar, the temperature of the ultra-high temperature and high pressure air is 650℃~1200℃, and the pressure is 2bar~6bar, the temperature of the high temperature and medium pressure air is 150℃~300℃, and the pressure is 1.2bar~3bar, the temperature of the normal temperature and medium pressure air is 25℃~50℃, and the pressure is 1.2bar~3bar, the temperature of the low temperature and normal pressure air is -10℃~15℃, and the pressure is 1bar, the temperature of the normal temperature and high pressure water is 20℃~30℃, and the pressure is 10bar~200bar, the temperature of the high temperature and normal pressure water is 60℃~90℃, and the pressure is 1bar, and the temperature of the low temperature and normal pressure water is 0℃~15℃, and the pressure is 1bar.

Images