Energy storage power generation system
The storage of hydrogen and compressed air is combined with the preheating of the air turbine module and the heating technology of hydrogen combustion, which solves the problems of low power and carbon emissions in the existing energy storage and power generation technologies, and achieves efficient and zero-carbon energy storage and power generation effects.
Patent Information
- Application Number
- CN202510228867.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2025-05-30
AI Technical Summary
Among the existing energy storage and power generation technologies, compressed air energy storage power is low and there are carbon emission problems, while hydrogen energy storage has low energy conversion efficiency.
Hydrogen is produced as zero-carbon fuel, combined with compressed air as working fluid, and stored compressed hydrogen and compressed air through electrolytic hydrogen production and compressed air modules. The air turbine module is used to improve the power and energy conversion efficiency of energy storage power generation and hydrogen combustion.
It realizes efficient energy storage and power generation, improves energy storage and power generation power, energy storage capacity and energy conversion efficiency, and realizes the energy storage and power generation function with zero carbon emissions.
Smart Images
Figure CN120073805A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of new energy energy storage, and particularly relates to an energy storage power generation system. Background Art
[0002] In related technologies, energy storage power generation includes compressed air energy storage or hydrogen energy storage for power generation. Compressed air energy storage is an energy storage method with high-pressure air as the energy storage medium, and hydrogen energy storage is an energy storage method with gaseous or liquid hydrogen as the energy storage medium. However, compressed air is usually stored in a gaseous state in high-pressure pipelines or pressure vessels, with a relatively low energy storage density. At the same time, when driving an air turbine to generate electricity and feed it into the grid through compressed air energy storage, compressed air needs to be supplemented with fuel for combustion, resulting in problems such as low power generation of compressed air energy storage, additional costs for fuel, and carbon emission problems. In the case of using hydrogen energy storage technology for hydrogen engine or hydrogen fuel cell power generation, the energy conversion efficiency is relatively low, and the energy conversion efficiency from electricity to power generation usually does not exceed 30%. Summary of the Invention
[0003] The purpose of this application is to propose an energy storage power generation system, which uses electrolytic hydrogen production as a zero-carbon fuel, uses compressed air as a working medium, stores compressed hydrogen and compressed air, and uses an air turbine to do work for power generation, preheating compressed air. These five key elements of the energy storage method can improve the energy storage power generation, energy storage capacity, and energy conversion efficiency, and achieve the zero-carbon energy storage power generation function.
[0004] To achieve the above object, this application proposes an energy storage power generation system. The energy storage power generation system is applied when there is surplus electricity in the power grid and includes a hydrogen fuel module, a compressed air module, and an air turbine module, where:
[0005] The hydrogen fuel module includes an electrolytic hydrogen production subsystem, a hydrogen compression subsystem, a hydrogen cooling heat exchanger, and a hydrogen storage tank. The electrolytic hydrogen production subsystem is driven by surplus electricity and is used for electrolytic hydrogen production. The hydrogen compression subsystem is also driven by surplus electricity and is used to compress the hydrogen produced by electrolytic hydrogen production to obtain compressed hydrogen. The hydrogen cooling heat exchanger is used to cool the compressed hydrogen to obtain compressed hydrogen at 50°C and 5 MPa. The hydrogen storage tank is used to store compressed hydrogen at 50°C and 5 MPa.
[0006] The compressed air module includes an air compressor, multiple intercooling coolers for compressed air, and a high-pressure air storage tank. The air compressor is driven by surplus electricity and is used to compress air to obtain compressed air. The intercooling coolers for compressed air are used to cool the compressed air to obtain compressed air at 50°C and 5 MPa. The high-pressure air storage tank is used to store compressed air at 50°C and 5 MPa.
[0007] The air turbine module includes a preheater, a combustion chamber, a turbine, and a generator. The preheater is connected to a high-pressure air storage tank and is used to preheat compressed air at 50°C and 3 MPa to compressed air at 224°C and 3 MPa. The combustion chamber is connected to a hydrogen storage tank and the high-pressure air storage tank respectively, and adopts an isobaric combustion heating method. It is used to heat the compressed air at 224°C and 3 MPa to compressed air at 876°C and 3 MPa by the heat generated from the combustion of compressed hydrogen at 50°C and 3 MPa. The turbine is used to convert the compressed air at 876°C and 3 MPa into mechanical energy. The generator is driven by mechanical energy to generate electricity. Among them, the compressed air at 50°C and 3 MPa is the air that flows to the inlet of the preheater after being regulated by a pressure-reducing valve from compressed air at 50°C and 5 MPa. The compressed hydrogen at 50°C and 3 MPa is the hydrogen that flows to the inlet of the combustion chamber after being regulated by a pressure-reducing valve from compressed hydrogen at 50°C and 5 MPa.
[0008] In addition, the energy storage power generation system proposed above according to the present application may also have the following additional technical features:
[0009] In some embodiments, the flow rate of the air compressor is 25 kg / s, and an intercooling device using water cooling is used to reduce the power consumption of the air compressor. In a single energy storage cycle of the energy storage power generation system, the air compressor operates for 5.33 hours.
[0010] In some embodiments, the total water volume of the gas storage tank is 20000 m 3 , the gas storage pressure is 5 MPa, and the gas release pressure is 3 MPa. In a single energy storage cycle of the energy storage power generation system, the amount of compressed air used for work is 400000 Nm 3 , that is, 480000 kg.
[0011] In some embodiments, the electrolytic hydrogen production subsystem adopts an alkaline solution hydrogen production device. The hydrogen production amount of the alkaline solution hydrogen production electrolytic cell is 6000 Nm 3 / h, and the outlet pressure is 1.5 MPa. In a single energy storage cycle of the energy storage power generation system, hydrogen is produced for 5.33 hours.
[0012] In some embodiments, the hydrogen compression subsystem adopts a hydrogen compressor. The hydrogen compression amount of the hydrogen compressor is 6000 Nm 3 / h, the inlet pressure is 1.5 MPa, and the outlet pressure is 5 MPa. In a single energy storage cycle of the energy storage power generation system, hydrogen is compressed for 5.33 hours.
[0013] In some embodiments, the total water volume of the hydrogen storage tank is 1600 m 3 , the hydrogen storage pressure is 5 MPa, and the hydrogen release pressure is 3 MPa. In a single energy storage cycle of the energy storage power generation system, the amount of hydrogen used for combustion is 32000 Nm 3 .
[0014] In some embodiments, the preheater uses a gas-gas heat exchanger. The heat transfer temperature difference of the gas-gas heat exchanger is 30°C. The inlet temperature of the preheater is 50°C, and the outlet temperature is 224°C. The flow rate on the hot side of the preheater is 33.53 kg / s, and the flow rate on the cold side of the preheater is 33.33 kg / s.
[0015] In some embodiments, the combustion chamber adopts a pure hydrogen combustion chamber. Hydrogen combustion is carried out through the pure hydrogen combustion chamber to heat the air at 224°C and 3 MPa at the inlet of the combustion chamber to air at 876°C and 3 MPa. The flow rate of the air at 224°C and 3 MPa is 33.33 kg / s, and the flow rate of the air at 876°C and 3 MPa is 33.53 kg / s.
[0016] In some embodiments, the air at the inlet of the turbine is at 876°C, 3 MPa, and 33.53 kg / s, and the exhaust gas temperature at the outlet is 254°C, and the pressure is 0.115 MPa. The air turbine flow rate is 33.53 kg / s.
[0017] In some embodiments, the exhaust gas at the outlet of the turbine is also used to heat the air at 50°C and 3 MPa in the preheater to air at 224°C and 3 MPa. After the exhaust gas heats the preheater, the exhaust gas with a temperature of 80°C and a pressure of 0.101 MPa is obtained and discharged from the exhaust port of the preheater.
[0018] The present application discloses an energy storage power generation system, which is applied when there is surplus power in the power grid. It includes a hydrogen fuel module, a compressed air module, and an air turbine module. The hydrogen fuel module is driven by the surplus power and stores compressed hydrogen at 50°C and 5 MPa; the compressed air module is driven by the surplus power and stores compressed air at 50°C and 5 MPa; the air turbine module preheats the compressed air at 50°C and 3 MPa to compressed air at 224°C and 3 MPa, and heats the compressed air at 224°C and 3 MPa to compressed air at 876°C and 3 MPa by the heat generated by the combustion of the compressed hydrogen at 50°C and 3 MPa, so as to be converted into mechanical energy for power generation. Thus, five energy storage methods of using electrolytic hydrogen production as a zero-carbon fuel, compressed air as a working medium, storing gaseous compressed hydrogen and gaseous compressed air, air turbine doing work for power generation, preheating compressed air and hydrogen combustion for temperature rise are used to improve the energy storage power generation power, energy storage capacity, and energy conversion efficiency, and realize the zero-carbon energy storage power generation function.
[0019] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:
[0021] Figure 1 It is a schematic structural diagram of an energy storage power generation system provided by an embodiment of the present application. Specific embodiments
[0022] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application.
[0023] The energy storage power generation system of the embodiment of the present application will be described below with reference to the accompanying drawings.
[0024] Figure 1 It is a structural diagram of an energy storage power generation system according to an embodiment of the present application.
[0025] As Figure 1 shown, for the energy storage power generation system of the embodiment of the present application, the energy storage power generation system is applied when there is surplus power in the power grid and includes a hydrogen fuel module, a compressed air module, and an air turbine module, where:
[0026] The hydrogen fuel module includes an electrolytic hydrogen production subsystem 11, a hydrogen compression subsystem 12, a hydrogen cooling heat exchanger 13, and a hydrogen storage tank 14 (hydrogen tank). The electrolytic hydrogen production subsystem 11 is driven by surplus power and is used for electrolytic hydrogen production. The hydrogen compression subsystem 12 is also driven by surplus power and is used for compressing the hydrogen produced by electrolytic hydrogen production to obtain compressed hydrogen. The hydrogen cooling heat exchanger 13 is used for cooling the compressed hydrogen to obtain compressed hydrogen at 50°C and 5 MPa. The hydrogen storage tank 14 is used for storing compressed hydrogen at 50°C and 5 MPa.
[0027] The compressed air module includes an air compressor 15 and a plurality of compressed air intercooling coolers (water-cooled) 16, and a high-pressure air storage tank 17 (gas storage tank). The air compressor 15 is driven by surplus power and is used for compressing air to obtain compressed air. The compressed air intercooling cooler 16 is used for cooling the compressed air to obtain compressed air at 50°C and 5 MPa. The high-pressure air storage tank 17 is used for storing compressed air at 50°C and 5 MPa.
[0028] Among them, the number of the air compressor 15 and the compressed air intercooling cooler 16 can be two, but is not limited thereto. This embodiment does not make a specific limitation on this.
[0029] The air turbine module includes a preheater 18, a combustion chamber 19, a turbine 20, and a generator 21. The preheater 18 is connected to a high-pressure air storage tank 17 and is used to preheat compressed air at 50°C and 3 MPa to compressed air at 224°C and 3 MPa. The combustion chamber 19 is respectively connected to a hydrogen storage tank 14 and the high-pressure air storage tank 17. By using an isobaric combustion heating method, it is used to heat the compressed air at 224°C and 3 MPa to compressed air at 876°C and 3 MPa through the heat generated by the combustion of compressed hydrogen at 50°C and 3 MPa. The turbine 20 is used to convert the compressed air at 876°C and 3 MPa into mechanical energy. The generator 21 is driven by mechanical energy to generate electricity. Among them, the compressed air at 50°C and 3 MPa is the air when the compressed air at 50°C and 5 MPa flows to the inlet of the preheater 18 after being adjusted by a pressure reducing valve. The compressed hydrogen at 50°C and 3 MPa is the hydrogen when the compressed hydrogen at 50°C and 5 MPa flows to the inlet of the combustion chamber 19 after being adjusted by a pressure reducing valve.
[0030] In some embodiments, as Figure 1 shown, the flow rate of the air compressor 15 is 25 kg / s, and a water-cooled intercooling device is used to reduce the power of the air compressor. In a single energy storage cycle of the energy storage power generation system, the air compressor 15 operates for 5.33 hours. Among them, the atmospheric air temperature at the air inlet corresponding to the air compressor 15 can be 15°C and the pressure can be 0.1 MPa.
[0031] In some embodiments, the total water volume of the gas storage tank is 20000 m 3 , the gas storage pressure is 5 MPa, and the gas release pressure is 3 MPa. In a single energy storage cycle of the energy storage power generation system, the amount of compressed air used for work is 400000 Nm 3 , that is, 480000 kg.
[0032] In some embodiments, as Figure 1 shown, the electrolytic hydrogen production subsystem 11 uses an alkaline solution hydrogen production device. The hydrogen production amount of the alkaline solution hydrogen production electrolytic cell (electrolyzing hydrogen H 2 and oxygen O 2 ) is 6000 Nm 3 / h, and the outlet pressure is 1.5 MPa. In a single energy storage cycle of the energy storage power generation system, hydrogen is produced for 5.33 hours.
[0033] In some embodiments, as Figure 1 shown, the hydrogen compression subsystem 12 uses a hydrogen compressor. The hydrogen compression amount of the hydrogen compressor is 6000 Nm 3 / h, the inlet pressure is 1.5 MPa, and the outlet pressure is 5 MPa. In a single energy storage cycle of the energy storage power generation system, hydrogen is compressed for 5.33 hours. Among them, the hydrogen temperature at the hydrogen inlet of the hydrogen compressor is 80°C, and the flow rate is 1.666 Nm3 / s.
[0034] In some embodiments, as Figure 1 shown, the total water volume of the hydrogen storage tank 14 is 1600 m 3 , the hydrogen storage pressure is 5 MPa, the hydrogen release pressure is 3 MPa. In a single energy storage cycle of the energy storage power generation system, the amount of hydrogen used for combustion is 32000 Nm 3 , wherein the temperature of the released hydrogen output from the hydrogen storage tank 14 is 50 °C and the flow rate is 0.1997 kg / s.
[0035] In some embodiments, as Figure 1 shown, the preheater 18 uses a gas-gas heat exchanger. The heat transfer temperature difference of the gas-gas heat exchanger is 30 °C, the inlet temperature of the preheater is 50 °C, the outlet temperature is 224 °C, the flow rate on the hot side of the preheater is 33.53 kg / s, and the flow rate on the cold side is 33.33 kg / s.
[0036] In some embodiments, as Figure 1 shown, the combustion chamber 19 adopts a pure hydrogen combustion chamber. Hydrogen combustion is carried out through the pure hydrogen combustion chamber to heat the air at 224 °C and 3 MPa at the inlet of the combustion chamber 19 to air at 876 °C and 3 MPa. The flow rate of the air at 224 °C and 3 MPa is 33.33 kg / s, and the flow rate of the air at 876 °C and 3 MPa is 33.53 kg / s.
[0037] In some embodiments, as Figure 1 shown, the air at the inlet of the turbine 20 is air at 876 °C, 3 MPa, and 33.53 kg / s. The temperature of the exhaust gas at the outlet is 254 °C, the pressure is 0.115 MPa, and the air turbine flow rate is 33.53 kg / s.
[0038] In some embodiments, as Figure 1 shown, the exhaust gas at the outlet of the turbine 20 is also used to heat the air at 50 °C and 5 MPa in the preheater 18 to air at 224 °C and 3 MPa. After the exhaust gas heats the preheater 18, the exhaust gas with a temperature of 80 °C and a pressure of 0.101 MPa is obtained and discharged from the exhaust port of the preheater 18, and the exhaust flow rate is 33.53 kg / s.
[0039] Thus, as Figure 1 shown, when the electric power consumption for air compression of the air compressor 15 is 12.43 MW, the electric power consumption for hydrogen production of the alkaline solution hydrogen production device is 29.99 MW, and the electric power consumption for hydrogen compression is 0.54 MW, the power supply power generated by the generator 21 is 23.07 MW; specifically, the parameters of each device in a single energy storage and energy release cycle of the energy storage power generation system are shown in Table 1. When the capacity (total water volume) of the high-pressure air storage tank 17 is 20000 Nm 3(The available compressed air for doing work is 400,000 Nm 3 , that is, 480,000 kg), the air compressor flow rate is 25 kg / s, the air compressor working duration is 5.33 h, the air compressor power is 12,430 kW (the power consumption for air compression is 12.43 MW), the air compressor power consumption is 66,291 kWh, the electrolytic cell hydrogen flow rate of the lye hydrogen production electrolytic cell is 1.666 Nm 3 / s (6000 Nm 3 / h), the electrolytic cell working duration is 5.33 h, the total hydrogen production of the electrolytic cell is 32,000 Nm 3 , the electrolytic cell power is 29,990 kW (the power consumption for hydrogen production is 29.99 MW), the electrolytic cell power consumption is 159,961 kWh, the volume of hydrogen storage tank 14 (total water volume) is 1600 m 3 , the hydrogen compressor flow rate is 1.666 Nm 3 / s (6000 Nm 3 / h), the hydrogen compressor working duration is 5.33 h, the hydrogen compressor power is 540 kW (the power consumption for hydrogen compression is 0.54 MW), the hydrogen compressor power consumption is 2879 kWh, the compressed air flow rate is 33.33 kg / s, the hydrogen fuel flow rate for compressed hydrogen is 0.2 kg / s, the air turbine flow rate of air turbine 20 is 33.53 kg / s, the air turbine power is 23,077 kW, the air turbine working duration is 4 h, the air turbine power generation is 92,310 kWh, the total power consumption is 229,131 kWh (the surplus power utilized), then the energy conversion efficiency in the whole energy conversion process of power consumption - energy storage - power generation is 40.29%. It is significantly higher than the energy conversion efficiency of traditional hydrogen energy storage systems.
[0040] Table 1 Parameters of each device under one - time energy storage and energy release cycle of the energy storage power generation system
[0041]
[0042]
[0043] In summary, this energy storage power generation system includes an electricity consumption link (energy charging link), an energy storage link, a power generation link, and an energy conversion efficiency link. Specifically, for the electricity consumption link: when there is surplus power in the power grid and the electricity price is at the trough value, the energy storage power generation system starts and uses the surplus power (electric energy) in the power grid. The electric energy has three uses (three energy charging paths), which respectively include:
[0044] Firstly, the electric energy is used to drive the air compressor 15 to pressurize the air from the atmosphere, and at the same time, the inter - cooling method is used to reduce the temperature of the compressed air to reduce the power of the air compressor. Finally, the pressure of the compressed air reaches 5 MPa.
[0045] Second, electrical energy is supplied to the electrolytic hydrogen production subsystem 11 to produce hydrogen by electrolyzing water. According to the matching relationship of this energy storage power generation system, for every 1 kg of compressed air compressed, 0.06665 Nm 3 of hydrogen gas is produced.
[0046] Third, electrical energy is supplied to the hydrogen compression subsystem 12 to boost the pressure of the hydrogen. At the same time, an intercooling method is used to reduce the power of the hydrogen compressor, and finally the pressure of the compressed hydrogen reaches 5 MPa.
[0047] In addition, during the power consumption (energy charging) process, the time taken by this energy storage system can be 5.33 hours, which matches the off-peak electricity price period of the power grid. Moreover, in terms of the energy storage capacity, compared with a single compressed air energy storage, hydrogen energy storage is added, and the energy storage scale is larger, about 100% larger; in terms of the power for absorbing the surplus power of the power grid, compared with a single compressed air energy storage, the hydrogen production power is added, and the power for absorbing the surplus power is higher, about 240% higher.
[0048] Energy storage link: A high-pressure air storage tank 17 is used for compressed air energy storage. The pressure of the compressed air is much higher than the atmospheric pressure and has the ability to do expansion work. A hydrogen storage tank 14 is used for hydrogen energy storage. Hydrogen, as a fuel, has chemical energy and the ability to burn and heat. Using a high-pressure air storage tank 17 and a hydrogen storage tank for energy storage is less affected by the external air temperature and allows for flexible selection of long-term and short-term energy storage within a cycle of several hours to several months. By using clean and carbon-free hydrogen as a fuel, it supplies the air turbine to do work and drives the generator 21 to supply power to the power grid. Compared with a supplementary combustion compressed air energy storage system, the carbon emission problem during the energy storage process is fundamentally eliminated, and the fuel cost is effectively reduced.
[0049] Power generation link: According to the power consumption demand of the power grid, power generation is carried out during the peak electricity price period. The compressed hydrogen in the hydrogen storage tank 14 is supplied as fuel to the combustion chamber 19 to heat the compressed air from the high-pressure air storage tank 17. By using the isobaric combustion heating method, the compressed air is heated from the preheating temperature of 224 °C to 876 °C. Next, it enters the turbine 20 for expansion work, converting the internal energy of the high-temperature compressed air into high-quality electrical energy to supply the power grid. In the power generation link, the power generation power of this energy storage system is 23.08 MW, and the power supply duration is 4 hours, which matches the peak electricity price period of the power grid. By using clean and carbon-free hydrogen as a fuel to heat the compressed air to 876 °C and expanding and doing work at a higher initial temperature in the turbine 20, the enthalpy drop of the working fluid can reach 688 kJ / kg, which is twice that of the working fluid in a non-supplementary combustion compressed air energy storage system, thus effectively increasing the power generation power.
[0050] Energy conversion efficiency section: Calculated according to the entire energy conversion process of power consumption - energy storage - power generation, after the energy storage power generation system completes one cycle of power consumption, energy storage, and power generation, the power consumption is 229,131 kWh, the power generation is 92,310 kWh, and the energy conversion efficiency is 40.29%. Compared with the hydrogen energy storage system based on pure hydrogen engines and hydrogen fuel cells with an energy conversion efficiency of no more than 30%, the energy conversion efficiency of this system from power consumption to power generation is increased by approximately 10%.
[0051] This application discloses an energy storage power generation system, which is applied when there is surplus power in the power grid. It includes a hydrogen fuel module, a compressed air module, and an air turbine module. The hydrogen fuel module is driven by the surplus power and stores compressed hydrogen at 50°C and 5 MPa; the compressed air module is driven by the surplus power and stores compressed air at 50°C and 5 MPa; the air turbine module preheats the compressed air at 50°C and 3 MPa to compressed air at 224°C and 3 MPa, and heats the compressed air at 224°C and 3 MPa to compressed air at 876°C and 3 MPa by the heat generated from the combustion of compressed hydrogen at 50°C and 3 MPa, so as to convert the compressed air at 876°C and 3 MPa into mechanical energy for power generation. Thus, an energy storage method using five key elements of using electrolytically produced hydrogen as a zero-carbon fuel, using compressed air as a working medium, storing compressed hydrogen and compressed air, using an air turbine to do work for power generation, and preheating compressed air can improve the energy storage power generation capacity, energy storage capacity, and energy conversion efficiency, and achieve the function of zero-carbon energy storage power generation.
[0052] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Additionally, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.
[0053] Any process or method description depicted in a flowchart or otherwise described herein can be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a specific logical function or process. The scope of the embodiments of the present application includes additional implementations where functions may be performed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present application pertain.
[0054] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.
[0055] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the above-described embodiment system can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the system embodiment.
[0056] In addition, in each of the embodiments of the present application, the functional units can be integrated into one processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.
[0057] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.
Claims
1. An energy storage power generation system, which is applied to a situation where there is surplus electricity in the power grid, and comprises a hydrogen fuel module, a compressed air module, and an air turbine module, wherein: The hydrogen fuel module includes an electrolytic hydrogen production subsystem, a hydrogen compression subsystem, a hydrogen cooling heat exchanger, and a hydrogen storage tank. The electrolytic hydrogen production subsystem is driven by surplus electricity and is used for electrolytic hydrogen production. The hydrogen compression subsystem is also driven by surplus electricity and is used for compressing hydrogen produced by electrolytic hydrogen production to obtain compressed hydrogen. The hydrogen cooling heat exchanger is used to cool the compressed hydrogen to obtain compressed hydrogen at 50° C. and 5 MPa. The hydrogen storage tank is used to store compressed hydrogen at 50° C. and 5 MPa. The compressed air module includes an air compressor and a plurality of compressed air intercoolers and a high-pressure air storage tank. The air compressor is driven by surplus electricity and is used to compress air to obtain compressed air. The compressed air intercooler is used to cool the compressed air to obtain compressed air at 50°C and 5MPa. The high-pressure air storage tank is used to store compressed air at 50°C and 5MPa. The air turbine module includes a preheater, a combustion chamber, a turbine, and a generator. The preheater is connected to a high-pressure air storage tank and is used to preheat the compressed air at 50°C and 3MPa to the compressed air at 224°C and 3MPa. The combustion chamber is respectively connected to a hydrogen storage tank and a high-pressure air storage tank, and adopts an isobaric combustion heating method to heat the compressed air at 224°C and 3MPa to the compressed air at 876°C and 3MPa by the heat of the combustion of compressed hydrogen at 50°C and 3MPa. The turbine is used to convert the compressed air at 876°C and 3MPa into mechanical energy. The generator is driven by mechanical energy to generate electricity, wherein the compressed air at 50°C and 3MPa is the air when the compressed air at 50°C and 5MPa flows to the inlet of the preheater after being adjusted by a pressure reducing valve, and the compressed hydrogen at 50°C and 3MPa is the hydrogen when the compressed hydrogen at 50°C and 5MPa flows to the inlet of the combustion chamber after being adjusted by a pressure reducing valve.
2. The energy storage power generation system according to claim 1, characterized in that: The flow rate of the air compressor is 25 kg / s, and a water-cooled intercooler is used to reduce the electric power of the air compressor. In a single energy storage cycle of the energy storage power generation system, the air compressor runs for 5.33 hours.
3. The energy storage power generation system according to claim 1, characterized in that: The total water volume of the gas tank is 20000m 3 The gas storage pressure is 5MPa, the gas release pressure is 3MPa, and in a single energy storage cycle of the energy storage power generation system, the amount of compressed air used to do work is 400000Nm 3 , that is 480000kg.
4. The energy storage power generation system according to claim 1, characterized in that: The electrolytic hydrogen production subsystem adopts an alkaline liquid hydrogen production device, and the hydrogen production capacity of the alkaline liquid hydrogen production electrolyzer is 6000Nm 3 / h, the outlet pressure is 1.5MPa, and in a single energy storage cycle of the energy storage power generation system, hydrogen is produced for 5.33 hours.
5. The energy storage power generation system according to claim 1, characterized in that: The hydrogen compression subsystem uses a hydrogen compressor with a hydrogen compression capacity of 6000Nm 3 / h, the inlet pressure is 1.5MPa, and the outlet pressure is 5MPa. In a single energy storage cycle of the energy storage power generation system, hydrogen is compressed for 5.33 hours.
6. The energy storage power generation system according to claim 1, characterized in that: The total water volume of the hydrogen storage tank is 1600m 3 The hydrogen storage pressure is 5MPa, and the hydrogen release pressure is 3MPa. In a single energy storage cycle of the energy storage power generation system, the amount of hydrogen used for combustion is 32000Nm 3 .
7. The energy storage power generation system according to claim 1, characterized in that: The preheater uses an air-to-air heat exchanger, the heat exchange temperature difference of the air-to-air heat exchanger is 30°C, the preheater inlet temperature is 50°C, the outlet temperature is 224°C, the preheater hot side flow rate is 33.53kg / s, and the cold side flow rate is 33.33kg / s.
8. The energy storage power generation system according to claim 1, characterized in that: The combustion chamber adopts a pure hydrogen combustion chamber, and hydrogen combustion is carried out through the pure hydrogen combustion chamber to heat the air at 224°C and 3MPa at the combustion chamber inlet to air at 876°C and 3MPa. The air flow rate at 224°C and 3MPa is 33.33kg / s, and the air flow rate at 876°C and 3MPa is 33.53kg / s.
9. The energy storage power generation system according to claim 1, characterized in that: The turbine inlet has air at 876°C, 3MPa, and 33.53kg / s, and the exhaust gas temperature at the outlet is 254°C, the pressure is 0.115MPa, and the air turbine flow rate is 33.53kg / s.
10. The energy storage power generation system according to claim 9, characterized in that: The exhaust gas at the turbine outlet is also used to heat the air at 50°C and 3MPa in the preheater to 224°C and 3MPa. After the exhaust gas heats the preheater, the exhaust gas with a temperature of 80°C and a pressure of 0.101MPa is obtained and discharged from the exhaust port of the preheater.