A methanol fuel-based gas turbine energy storage system and method thereof

Abstract

The application belongs to the technical field of energy storage, and relates to an energy storage system and method based on a methanol fuel gas turbine, which comprises a carbon dioxide circulation supply assembly, a methanol energy storage assembly and a gas turbine circulation assembly. The application can prepare methanol from unstable electric energy generated by new energy power generation, store the internal energy of the methanol converted from the electric energy, and reduce the storage difficulty of the methanol which is in a liquid state at normal temperature and pressure compared with high-pressure gas. Meanwhile, hydrogen and carbon monoxide generated by cracking of the methanol are used as fuel of the gas turbine circulation assembly, waste heat of the gas turbine circulation assembly is converted into internal energy of the fuel to drive a first turbine in the gas turbine circulation assembly, the first turbine is expanded to do work to drive a generator to generate electricity, waste heat of the gas turbine circulation assembly is recycled, the efficiency of conversion of chemical energy of the fuel into mechanical energy is improved, and the loss of conversion of chemical energy into physical energy in the combustion process is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage, and relates to an energy storage system based on a methanol fuel gas turbine and a method thereof. BACKGROUND

[0002] New energy power generation has an increasing proportion in the energy structure due to its advantages of being clean and renewable. However, new energy has the characteristics of intermittency and strong volatility, and large-scale grid connection will affect the stable operation of the power grid. The application of energy storage technology can effectively smooth the power grid fluctuations and is the key to solving the intermittency and instability of new energy.

[0003] At present, traditional energy storage technologies include compressed air energy storage, but compressed air energy storage has many defects. Firstly, compressed air energy storage needs to use complex pressure vessels or rely on special geographical environments to store high-pressure gas, resulting in increased energy storage costs. Secondly, when using a gas turbine as a common power generation device, the high temperature level of the gas turbine easily causes large heat exchange losses, leading to insufficient waste heat utilization. At the same time, there is a large energy loss in the conversion from chemical energy to physical energy during fuel combustion, which reduces the energy utilization efficiency of the entire system. SUMMARY

[0004] The purpose of the present application is to provide an energy storage system based on a methanol fuel gas turbine and a method thereof, which can avoid using complex pressure vessels or relying on special geographical environments to store high-pressure gas, while reducing heat exchange losses and improving the energy utilization efficiency of the entire system.

[0005] To achieve the above purpose, the technical solution provided by the present application is as follows:

[0006] An energy storage system based on a methanol fuel gas turbine, comprising:

[0007] A carbon dioxide circulation supply assembly for supplying carbon dioxide with pressure;

[0008] A methanol energy storage assembly comprising an electrolytic water device, a methanol synthesis device and a methanol storage tank connected in sequence. The required electric energy of the electrolytic water device and the methanol synthesis device comes from new energy power generation. The electrolytic water device is used to electrolyze water to generate oxygen and hydrogen. The methanol synthesis device is connected with the carbon dioxide circulation supply assembly. The methanol synthesis device is used to synthesize methanol by using the hydrogen generated by the electrolytic water device and the carbon dioxide with pressure supplied by the carbon dioxide circulation supply assembly. The synthesized methanol is transported to the methanol storage tank for storage;

[0009] The gas turbine cycle assembly comprises a first compressor, a methanol cracking heat exchanger, a first combustion chamber and a first turbine connected in sequence, the first compressor is used for compressing air, a first inlet of the methanol cracking heat exchanger is connected with a methanol storage tank, a first outlet of the methanol cracking heat exchanger is connected with a first inlet of the first combustion chamber, the methanol cracking heat exchanger is used for heat exchange between compressed air and methanol, so that the methanol is cracked into hydrogen and carbon monoxide, the first combustion chamber is used for providing a combustion environment for the heat-exchanged compressed air, hydrogen and carbon monoxide, and obtaining a first mixed gas after combustion, and the first turbine is used for driving a generator to generate electricity by expansion of the first mixed gas.

[0010] The application also has the characteristics that:

[0011] The first regenerator is connected with the methanol cracking heat exchanger and the first combustion chamber, a first inlet of the first regenerator is connected with a second outlet of the methanol cracking heat exchanger, a first outlet of the first regenerator is connected with a second inlet of the first combustion chamber, a second inlet of the first regenerator is connected with an outlet of the first turbine, and the first regenerator is used for heating the heat-exchanged compressed air by using the first mixed gas after expansion.

[0012] The second outlet of the first regenerator is connected with a carbon capture device.

[0013] The carbon dioxide circulation supply assembly comprises a second compressor, a condenser, a booster pump, a second combustion chamber, a second turbine and a gas-liquid separator connected in sequence, the second compressor is connected with a methanol synthesis device, the second compressor is used for compressing gaseous carbon dioxide, a part of the compressed gaseous carbon dioxide enters the methanol synthesis device, and the remaining compressed gaseous carbon dioxide is condensed into liquid carbon dioxide in the condenser, the booster pump is used for pressurizing the liquid carbon dioxide, the second combustion chamber is connected with an electrolytic water device, the second combustion chamber is connected with a fuel supply element, the second combustion chamber is used for introducing fuel, oxygen and pressurized liquid carbon dioxide, so that the fuel is burned in an oxygen-rich environment and mixed with the pressurized liquid carbon dioxide to obtain a second mixed gas, the second turbine is used for driving a generator to generate electricity by expansion of the second mixed gas, and the gas-liquid separator is used for gas-liquid separation treatment of the second mixed gas after expansion to obtain carbon dioxide and water, and gaseous carbon dioxide is sent into the second compressor.

[0014] The second regenerator is connected between the booster pump and the second combustion chamber, a first inlet of the second regenerator is connected with an outlet of the booster pump, a first outlet of the second regenerator is connected with a first inlet of the second combustion chamber, and a second inlet of the second regenerator is connected with an outlet of the second turbine, and the second regenerator is used for heating the liquid carbon dioxide by using the second mixed gas after expansion.

[0015] The gas-liquid separator is connected with the electrolytic water device, and water generated by the gas-liquid separator is sent into the electrolytic water device.

[0016] An energy storage method based on a methanol fuel gas turbine includes the following steps:

[0017] Low-pressure carbon dioxide at room temperature is introduced into the second compressor for compression to obtain medium-temperature, medium-pressure carbon dioxide. Part of the medium-temperature, medium-pressure carbon dioxide enters the condenser for cooling, resulting in liquid carbon dioxide. This liquid carbon dioxide is then pressurized by the booster pump and transported into the second regenerator for heat exchange and temperature increase before entering the second combustion chamber. In the second combustion chamber, fuel is burned and mixed with the heated liquid carbon dioxide to obtain a high-temperature, high-pressure second mixed gas. This high-temperature, high-pressure second mixed gas enters the second turbine, expands, and performs work to drive a generator to generate electricity. Simultaneously, some of the kinetic energy generated by the expansion in the second turbine drives the second compressor. The expanded second mixed gas then enters the second regenerator for heat exchange and cooling, and then enters the gas-liquid separator for gas-liquid separation to obtain low-pressure carbon dioxide at room temperature and water. The low-pressure carbon dioxide at room temperature then enters the second compressor for recirculation.

[0018] The electricity generated by the new energy power generation is transmitted to the water electrolysis unit and the methanol synthesis unit to supply power to the water electrolysis unit and the methanol synthesis unit. The water electrolysis unit electrolyzes water into hydrogen and oxygen. The hydrogen enters the methanol synthesis unit and combines with the residual medium-temperature and medium-pressure carbon dioxide from the second compressor to synthesize methanol. The methanol enters the methanol storage tank for storage.

[0019] Normal temperature and pressure air is introduced into the first compressor for compression to obtain medium temperature and high pressure air. The medium temperature and high pressure air enters the methanol cracking heat exchanger to release heat and cool down, providing heat for methanol cracking. The medium temperature and high pressure air becomes medium temperature and high pressure air. The medium temperature and high pressure air enters the first regenerator for heat exchange and temperature rise before entering the first combustion chamber. Methanol in the methanol storage tank enters the methanol cracking heat exchanger for cracking to obtain hydrogen and carbon monoxide. Hydrogen and carbon monoxide enter the first combustion chamber for combustion to obtain a high temperature and high pressure first mixed gas. The high temperature and high pressure first mixed gas enters the first turbine for expansion and work to drive the generator to generate electricity. At the same time, part of the kinetic energy generated by the expansion and work in the first turbine drives the first compressor to run. The first mixed gas after expansion and work enters the first regenerator for heat exchange and cooling, and then enters the carbon capture device for carbon dioxide capture.

[0020] The temperature of the ambient low-pressure carbon dioxide is 25℃~30℃ and the pressure is 3MPa~4MPa; the temperature of the medium-temperature medium-pressure carbon dioxide is 85℃~110℃ and the pressure is 7.8MPa~8MPa; the temperature of the liquid carbon dioxide is 25℃~30℃ and the pressure is 7.8MPa~8MPa; the temperature of the first high-temperature high-pressure mixed gas is 1050℃~1150℃ and the pressure is 25MPa~35MPa; the temperature of the medium-temperature high-pressure air is 200℃~300℃ and the pressure is 600kPa~800kPa; the temperature of the medium-low temperature high-pressure air is 100℃~150℃ and the pressure is 600kPa~800kPa; and the temperature of the second high-temperature high-pressure mixed gas is 1100℃~1300℃ and the pressure is 600kPa~800kPa.

[0021] The energy storage system and method based on a methanol fuel gas turbine of the present invention have the following advantages:

[0022] This invention, through the coordination of a carbon dioxide cycle supply component, a methanol energy storage component, and a gas turbine cycle component, enables the production of methanol from unstable electrical energy generated by new energy power generation. This electrical energy is then converted into the internal energy of the methanol for storage. Compared to high-pressure gases, methanol is liquid at normal temperature and pressure, reducing storage difficulty and avoiding the need for complex pressure vessels or reliance on special geographical environments for storing high-pressure gases. Simultaneously, hydrogen and carbon monoxide produced from methanol cracking are used as fuel for the gas turbine cycle component. The waste heat of the gas turbine cycle component is converted into fuel internal energy to drive the first turbine within the gas turbine cycle component. The expansion of the first turbine then drives a generator to generate electricity, promoting the recovery and utilization of waste heat from the gas turbine cycle component. This also improves the efficiency of converting the chemical energy of the fuel into mechanical energy, reduces energy loss during combustion, and achieves comprehensive and efficient cascade utilization of energy, thus improving the overall energy efficiency of the system. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the overall process of the present invention.

[0025] Figure label:

[0026] 1. First compressor; 2. Condenser; 3. Booster pump; 4. First regenerator; 5. First combustion chamber; 6. First turbine; 7. Gas-liquid separator; 8. Water electrolysis unit; 9. Methanol synthesis unit; 10. Methanol storage tank; 11. Second compressor; 12. Methanol cracking heat exchanger; 13. Second regenerator; 14. Second combustion chamber; 15. Second turbine; 16. First control valve; 17. Second control valve; 18. Third control valve; 19. Fourth control valve; 20. Carbon capture unit. Detailed Implementation

[0027] The technical solutions of the present invention will now be described clearly and in detail with reference to the accompanying drawings. In the description of the embodiments of the present invention, unless otherwise stated, " / " indicates "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, in the description of the embodiments of the present invention, "multiple" refers to two or more. The terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0028] like Figure 1As shown, this invention provides an energy storage system based on a methanol fuel gas turbine, including a carbon dioxide circulation supply component, a methanol energy storage component, and a gas turbine circulation component. The carbon dioxide circulation supply component supplies pressurized carbon dioxide. The methanol energy storage component includes a water electrolysis device 8, a methanol synthesis device 9, and a methanol storage tank 10 connected in sequence. The electricity required for the water electrolysis device 8 and the methanol synthesis device 9 comes from new energy power generation. The water electrolysis device 8 is used to electrolyze water to produce oxygen and hydrogen. The methanol synthesis device 9 is connected to the carbon dioxide circulation supply component and is used to synthesize methanol using the hydrogen produced by the water electrolysis device 8 and the pressurized carbon dioxide supplied by the carbon dioxide circulation supply component. The synthesized methanol... The alcohol is transported to the methanol storage tank 10 for storage. The gas turbine cycle assembly includes a first compressor 1, a methanol cracking heat exchanger 12, a first combustion chamber 5, and a first turbine 6 connected in sequence. The first compressor 1 is used to compress air. The first inlet of the methanol cracking heat exchanger 12 is connected to the methanol storage tank 10, and the first outlet of the methanol cracking heat exchanger 12 is connected to the first inlet of the first combustion chamber 5. The methanol cracking heat exchanger 12 is used to exchange heat between the compressed air and the methanol, so that the methanol is cracked into hydrogen and carbon monoxide. The first combustion chamber 5 is used to provide a combustion environment for the compressed air, hydrogen, and carbon monoxide after heat exchange, and to obtain a first mixed gas after combustion. The first turbine 6 is used to use the expansion of the first mixed gas to drive the generator to generate electricity. This invention, through the coordination of a carbon dioxide cycle supply component, a methanol energy storage component, and a gas turbine cycle component, enables the production of methanol from unstable electrical energy generated by new energy power generation. This electrical energy is then converted into the internal energy of the methanol for storage. Compared to high-pressure gases, methanol is liquid at normal temperature and pressure, reducing storage difficulty and avoiding the need for complex pressure vessels or reliance on special geographical environments for storing high-pressure gases. Simultaneously, hydrogen and carbon monoxide produced from methanol cracking are used as fuel for the gas turbine cycle component. The waste heat of the gas turbine cycle component is converted into fuel internal energy to drive the first turbine within the gas turbine cycle component. The expansion of the first turbine then drives a generator to generate electricity, promoting the recovery and utilization of waste heat from the gas turbine cycle component. This also improves the efficiency of converting the chemical energy of the fuel into mechanical energy, reduces energy loss during combustion, and achieves comprehensive and efficient cascade utilization of energy, thus improving the overall energy efficiency of the system.

[0029] like Figure 1 As shown, a first regenerator 4 is provided between the methanol cracking heat exchanger 12 and the first combustion chamber 5. The first inlet of the first regenerator 4 is connected to the second outlet of the methanol cracking heat exchanger 12, the first outlet of the first regenerator 4 is connected to the second inlet of the first combustion chamber 5, and the second inlet of the first regenerator 4 is connected to the outlet of the first turbine 6. The first regenerator 4 is used to heat the compressed air after heat exchange using the first mixed gas after expansion and work.

[0030] likeFigure 1 As shown, the second outlet of the first regenerator 4 is connected to a carbon capture device 20. The carbon capture device 20 is used to capture carbon in the first mixed gas after the expansion and work done by the first turbine 6 to obtain carbon dioxide.

[0031] like Figure 1 As shown, the carbon dioxide circulation supply assembly includes a second compressor 11, a condenser 2, a booster pump 3, a second combustion chamber 14, a second turbine 15, and a gas-liquid separator 7 connected in sequence. The second compressor 11 is connected to a methanol synthesis unit 9 and is used to compress gaseous carbon dioxide. A portion of the compressed gaseous carbon dioxide enters the methanol synthesis unit 9, and the remaining compressed gaseous carbon dioxide enters the condenser 2 to condense into liquid carbon dioxide. The booster pump 3 is used to pressurize the liquid carbon dioxide. The second combustion chamber 14 is connected to a water electrolysis unit 8 and is connected to a fuel supply unit. The second combustion chamber 14 is used to introduce fuel, oxygen, and pressurized liquid carbon dioxide, so that the fuel burns in an oxygen-rich environment and mixes with the pressurized liquid carbon dioxide to obtain a second mixed gas. The second turbine 15 is used to use the expansion of the second mixed gas to drive a generator to generate electricity. The gas-liquid separator 7 is used to separate the second mixed gas after expansion to obtain carbon dioxide and water, and then sends the gaseous carbon dioxide back to the second compressor 11 to complete the cycle.

[0032] The second compressor 11, condenser 2, booster pump 3, second combustion chamber 14, second turbine 15 and gas-liquid separator 7 together form the ALLAM cycle, which is a supercritical carbon dioxide combustion cycle. While supplying pressurized carbon dioxide to the methanol energy storage component, it also replenishes its own carbon dioxide through fuel combustion. In addition, the ALLAM cycle is also used for efficient power generation and low carbon emissions.

[0033] like Figure 1 As shown, the fuel supply unit includes a methane storage tank containing methane, and the outlet of the methane storage tank is connected to the second combustion chamber 14 for conveying methane into the methane storage tank.

[0034] like Figure 1 As shown, a second regenerator 13 is provided between the booster pump 3 and the second combustion chamber 14. The first inlet of the second regenerator 13 is connected to the outlet of the booster pump 3, the first outlet of the second regenerator 13 is connected to the first inlet of the second combustion chamber 14, and the second inlet of the second regenerator 13 is connected to the outlet of the second turbine 15. The second regenerator 13 is used to heat liquid carbon dioxide using the second mixed gas after expansion and work.

[0035] like Figure 1 As shown, the gas-liquid separator 7 is connected to the water electrolysis device 8, and the water generated by the gas-liquid separator 7 is transported into the water electrolysis device 8.

[0036] like Figure 1 As shown, the first inlet of the condenser 2 is connected to the outlet of the second compressor 11, and the second inlet and second outlet of the condenser 2 are connected to a water-cooling assembly. The condenser 2 is used to cool the compressed gaseous carbon dioxide using the water-cooling assembly. The water-cooling assembly sends room temperature water into the condenser 2 to cool the compressed gaseous carbon dioxide.

[0037] like Figure 1 As shown, the inlet of the water electrolysis device 8 is equipped with a water replenishment component, which is used to replenish water in the water electrolysis device 8 so that the water electrolysis device 8 can perform water electrolysis.

[0038] like Figure 1 As shown, the first inlet of the methanol synthesis unit 9 is connected to the first outlet of the water electrolysis unit 8, the second inlet of the methanol synthesis unit 9 is connected to the outlet of the second compressor 11, and the second inlet of the methanol synthesis unit 9 is equipped with a first control valve 16. The second inlet of the second combustion chamber 14 is connected to the second outlet of the water electrolysis unit 8, the third inlet of the second combustion chamber 14 is connected to the outlet of the methane storage tank, and the third inlet of the second combustion chamber 14 is equipped with a second control valve 17. The inlet of the first compressor 1 is equipped with a third control valve 18, and the outlet of the methanol storage tank 10 is equipped with a fourth control valve 19.

[0039] like Figure 2 As shown, the present invention also provides an energy storage method based on a methanol fuel gas turbine, comprising the following steps:

[0040] Low-pressure carbon dioxide at room temperature is introduced into the second compressor 11 for compression to obtain medium-temperature and medium-pressure carbon dioxide. Part of the medium-temperature and medium-pressure carbon dioxide enters the condenser 2 for cooling and becomes liquid carbon dioxide. This liquid carbon dioxide is then pressurized by the booster pump 3 and transported into the second regenerator 13 for heat exchange and heating before entering the second combustion chamber 14. In the second combustion chamber 14, fuel is burned and mixed with the heated liquid carbon dioxide to obtain a high-temperature and high-pressure second mixed gas. This high-temperature and high-pressure second mixed gas enters the second turbine 15 for expansion and work, driving the generator to generate electricity. At the same time, part of the kinetic energy generated by the expansion and work in the second turbine 15 drives the second compressor 11. The second mixed gas after expansion and work enters the second regenerator 13 for heat exchange and cooling, and then enters the gas-liquid separator 7 for gas-liquid separation to obtain low-pressure carbon dioxide at room temperature and water. The low-pressure carbon dioxide at room temperature enters the second compressor 11 for recirculation.

[0041] The electricity generated by the new energy power generation is sent to the water electrolysis device 8 and the methanol synthesis device 9 to supply power to the water electrolysis device 8 and the methanol synthesis device 9. The water electrolysis device 8 electrolyzes water into hydrogen and oxygen. The hydrogen enters the methanol synthesis device 9 and combines with the remaining medium-temperature and medium-pressure carbon dioxide from the second compressor 11 to synthesize methanol. The methanol enters the methanol storage tank 10 for storage. The oxygen is sent to the second combustion chamber 14 to provide an oxygen-rich combustion environment for the fuel combustion.

[0042] Normal temperature and pressure air is introduced into the first compressor 1 for compression to obtain medium temperature and high pressure air. The medium temperature and high pressure air enters the methanol cracking heat exchanger 12 to release heat and cool down, providing heat for methanol cracking. The medium temperature and high pressure air becomes medium temperature and high pressure air. The medium temperature and high pressure air enters the first regenerator 4 for heat exchange and temperature increase before entering the first combustion chamber 5. Methanol in methanol storage tank 10 enters the methanol cracking heat exchanger 12 for cracking to obtain hydrogen and carbon monoxide. Hydrogen and carbon monoxide enter the first combustion chamber 5 for combustion to obtain a high temperature and high pressure first mixed gas. The high temperature and high pressure first mixed gas enters the first turbine 6 for expansion and work to drive the generator to generate electricity. At the same time, part of the kinetic energy generated by the expansion and work of the first turbine 6 drives the first compressor 1 to run. The first mixed gas after expansion and work enters the first regenerator 4 for heat exchange and cooling, and then enters the carbon capture device 20 for carbon dioxide capture.

[0043] Among them, the temperature of ambient low-pressure carbon dioxide is 25℃~30℃ and the pressure is 3MPa~4MPa; the temperature of medium-temperature medium-pressure carbon dioxide is 85℃~110℃ and the pressure is 7.8MPa~8MPa; the temperature of liquid carbon dioxide is 25℃~30℃ and the pressure is 7.8MPa~8MPa; the temperature of the first high-temperature high-pressure mixed gas is 1050℃~1150℃ and the pressure is 25MPa~35MPa; the temperature of medium-temperature high-pressure air is 200℃~300℃ and the pressure is 600kPa~800kPa; the temperature of medium-low temperature high-pressure air is 100℃~150℃ and the pressure is 600kPa~800kPa; and the temperature of the second high-temperature high-pressure mixed gas is 1100℃~1300℃ and the pressure is 600kPa~800kPa.

[0044] Working principle:

[0045] When the power generation of new energy sources is high, the third control valve 18 and the fourth control valve 19 are closed, and the first control valve 16 and the second control valve 17 are opened. The ALLAM cycle formed by the carbon dioxide circulation supply component works. The ambient temperature low-pressure carbon dioxide enters the second compressor 11 for compression to obtain medium temperature medium-pressure carbon dioxide. Part of the medium temperature medium-pressure carbon dioxide enters the condenser 2 for cooling and cooling to obtain liquid carbon dioxide. After being pressurized by the booster pump 3, it is transported into the second regenerator 13 for heat exchange and heating and then enters the second combustion chamber 14. The fuel is burned in the second combustion chamber 14 and mixed with the heated liquid carbon dioxide to obtain a high temperature and high pressure second mixed gas. The high temperature and high pressure second mixed gas enters the second turbine 15 for expansion and work to drive the generator to generate electricity. At the same time, part of the kinetic energy generated by the expansion and work in the second turbine 15 drives the second compressor 11 to run. The second mixed gas after expansion and work enters the second regenerator 13 for heat exchange and cooling, and then enters the gas-liquid separator 7 for gas-liquid separation to obtain ambient temperature low-pressure carbon dioxide and water. The ambient temperature low-pressure carbon dioxide enters the second compressor 11 for recirculation.

[0046] At the same time, the methanol energy storage component is working, and the electricity generated by the new energy power generation is sent to the water electrolysis device 8 and the methanol synthesis device 9 to supply power to the water electrolysis device 8 and the methanol synthesis device 9. The water electrolysis device 8 electrolyzes water into hydrogen and oxygen. The hydrogen enters the methanol synthesis device 9 and synthesizes methanol with the remaining medium-temperature and medium-pressure carbon dioxide from the second compressor 11. The methanol enters the methanol storage tank 10 for storage.

[0047] As the power generation capacity of new energy sources gradually decreases, the openings of the first control valve 16 and the second control valve 17 are reduced, while the openings of the third control valve 18 and the fourth control valve 19 are opened and gradually increased. Simultaneously, the water supply to the electrolysis water device 8 is reduced. This allows the carbon dioxide circulation supply component to operate while the gas turbine circulation component operates. Atmospheric temperature and pressure air enters the first compressor 1 for compression, resulting in medium-temperature and high-pressure air. This medium-temperature and high-pressure air then enters the methanol cracking heat exchanger 12 for heat release and cooling, providing heat for methanol cracking. The medium-temperature and high-pressure air then becomes medium-low temperature and high-pressure air, which enters the first... After being heated by heat exchange in the regenerator 4, the methanol enters the first combustion chamber 5. The methanol in the methanol storage tank 10 enters the methanol cracking heat exchanger 12 for cracking to obtain hydrogen and carbon monoxide. The hydrogen and carbon monoxide enter the first combustion chamber 5 for combustion to obtain a high-temperature and high-pressure first mixed gas. The high-temperature and high-pressure first mixed gas enters the first turbine 6 for expansion and work to drive the generator to generate electricity. At the same time, part of the kinetic energy generated by the expansion and work in the first turbine 6 drives the first compressor 1 to run. The first mixed gas after expansion and work enters the first regenerator 4 for heat exchange and cooling, and then enters the carbon capture device 20 for carbon dioxide capture.

[0048] When the power generation of new energy sources further decreases and cannot meet the needs of water electrolysis and methanol synthesis, the first control valve 16 and the second control valve 17 are closed, the water supply to the water electrolysis device 8 is stopped, and the third control valve 18 and the fourth control valve 19 are fully opened, and the gas turbine circulation component starts to work.

[0049] The energy storage system and method based on a methanol fuel gas turbine of the present invention have other advantages as follows:

[0050] First, the operation of the carbon dioxide cycle supply component forms the ALLAM cycle. While supplying pressurized carbon dioxide to the methanol energy storage component, it not only replenishes its own carbon dioxide through fuel combustion, but also utilizes the ALLAM cycle for efficient power generation and low carbon emissions.

[0051] Secondly, this invention features a flexible operating mode, capable of adjusting its operation based on the status of new energy power generation. When there is a surplus of new energy power generation, the system can use the excess electricity for water electrolysis and methanol synthesis, converting electrical energy into the internal energy of methanol for storage. When electricity demand is high or new energy power generation is insufficient, methanol can be cracked into hydrogen and carbon monoxide for use as fuel in gas turbines to generate electricity, thereby releasing energy and converting unstable new energy power generation into stable power output, effectively improving the stability and reliability of the power system.

[0052] Third, this invention has high integration and adaptability. The components of the energy storage system are highly integrated and can be flexibly configured and expanded according to different application scenarios and energy demands. It has strong adaptability and can be widely used in various new energy power generation scenarios and power supply systems.

[0053] Fourth, this invention has environmental advantages. Methanol, as a relatively clean fuel, has more environmentally friendly combustion products than traditional fossil fuels. It can also play a role in carbon sequestration, reducing the emission of pollutants and greenhouse gases to a certain extent.

[0054] It is understood that this invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this invention are within the protection scope of this invention.

Claims

1. An energy storage system based on a methanol-fueled gas turbine, characterized in that, include: A carbon dioxide recirculation supply assembly for supplying pressurized carbon dioxide; The methanol energy storage component includes an electrolysis water device (8), a methanol synthesis device (9), and a methanol storage tank (10) connected in sequence. The electrical energy required by the electrolysis water device (8) and the methanol synthesis device (9) comes from new energy power generation. The electrolysis water device (8) is used to electrolyze water to produce oxygen and hydrogen. The methanol synthesis device (9) is connected to a carbon dioxide circulation supply component. The methanol synthesis device (9) is used to synthesize methanol using hydrogen produced by the electrolysis water device (8) and pressurized carbon dioxide supplied by the carbon dioxide circulation supply component. The synthesized methanol is transported to the methanol storage tank (10) for storage. The gas turbine cycle assembly includes a first compressor (1), a methanol cracking heat exchanger (12), a first combustion chamber (5), and a first turbine (6) connected in sequence. The first compressor (1) is used to compress air. The first inlet of the methanol cracking heat exchanger (12) is connected to the methanol storage tank (10), and the first outlet of the methanol cracking heat exchanger (12) is connected to the first inlet of the first combustion chamber (5). The methanol cracking heat exchanger (12) is used to exchange heat between the compressed air and methanol, so that the methanol is cracked into hydrogen and carbon monoxide. The first combustion chamber (5) is used to provide a combustion environment for the compressed air, hydrogen, and carbon monoxide after heat exchange, and to obtain a first mixed gas after combustion. The first turbine (6) is used to use the expansion of the first mixed gas to drive the generator to generate electricity. A first regenerator (4) is provided between the methanol cracking heat exchanger (12) and the first combustion chamber (5). The first inlet of the first regenerator (4) is connected to the second outlet of the methanol cracking heat exchanger (12), the first outlet of the first regenerator (4) is connected to the second inlet of the first combustion chamber (5), and the second inlet of the first regenerator (4) is connected to the outlet of the first turbine (6). The first regenerator (4) is used to heat the compressed air after heat exchange by using the first mixed gas after expansion and work. The carbon dioxide circulation supply assembly includes a second compressor (11), a condenser (2), a booster pump (3), a second combustion chamber (14), a second turbine (15), and a gas-liquid separator (7) connected in sequence. The second compressor (11) is connected to the methanol synthesis unit (9). The second compressor (11) is used to compress gaseous carbon dioxide. A portion of the compressed gaseous carbon dioxide enters the methanol synthesis unit (9), and the remaining compressed gaseous carbon dioxide enters the condenser (2) to condense into liquid carbon dioxide. The booster pump (3) is used to pressurize the liquid carbon dioxide. The second combustion chamber (14)... The chamber (14) is connected to the water electrolysis device (8). The second combustion chamber (14) is connected to a fuel supply unit. The second combustion chamber (14) is used to introduce fuel, oxygen and pressurized liquid carbon dioxide, so that the fuel burns in an oxygen-rich environment and mixes with the pressurized liquid carbon dioxide to obtain a second mixed gas. The second turbine (15) is used to use the expansion of the second mixed gas to drive the generator to generate electricity. The gas-liquid separator (7) is used to perform gas-liquid separation treatment on the second mixed gas after expansion to obtain carbon dioxide and water, and send the gaseous carbon dioxide into the second compressor (11). A second regenerator (13) is provided between the booster pump (3) and the second combustion chamber (14). The first inlet of the second regenerator (13) is connected to the outlet of the booster pump (3), the first outlet of the second regenerator (13) is connected to the first inlet of the second combustion chamber (14), and the second inlet of the second regenerator (13) is connected to the outlet of the second turbine (15). The second regenerator (13) is used to heat liquid carbon dioxide using the second mixed gas after expansion and work.

2. The energy storage system based on a methanol fuel gas turbine according to claim 1, characterized in that, The second outlet of the first regenerator (4) is connected to a carbon capture device (20).

3. The energy storage system based on a methanol fuel gas turbine according to claim 1, characterized in that, The gas-liquid separator (7) is connected to the water electrolysis device (8), and the water generated by the gas-liquid separator (7) is transported into the water electrolysis device (8).

4. An energy storage method based on a methanol fuel gas turbine, characterized in that, The energy storage system as described in claim 3 includes the following steps: Low-pressure carbon dioxide at room temperature is introduced into the second compressor (11) for compression to obtain medium-temperature and medium-pressure carbon dioxide. Part of the medium-temperature and medium-pressure carbon dioxide enters the condenser (2) for cooling and temperature reduction, and the resulting liquid carbon dioxide is pressurized by the booster pump (3) and then transported into the second regenerator (13) for heat exchange and temperature increase before entering the second combustion chamber (14). The fuel is burned in the second combustion chamber (14) and mixed with the heat-exchanged and heated liquid carbon dioxide to obtain a high-temperature and high-pressure second mixed gas. The high-temperature and high-pressure second mixed gas enters the second turbine (15) for expansion and work to drive the generator to generate electricity. At the same time, part of the kinetic energy generated by the expansion and work in the second turbine (15) drives the second compressor (11) to run. The second mixed gas after expansion and work enters the second regenerator (13) for heat exchange and temperature reduction, and then enters the gas-liquid separator (7) for gas-liquid separation to obtain low-pressure carbon dioxide at room temperature and water. The low-pressure carbon dioxide at room temperature enters the second compressor (11) for recirculation. The electricity generated by the new energy power generation is delivered to the water electrolysis device (8) and the methanol synthesis device (9) to supply power to the water electrolysis device (8) and the methanol synthesis device (9). The water electrolysis device (8) electrolyzes water into hydrogen and oxygen. The hydrogen enters the methanol synthesis device (9) and synthesizes methanol with the remaining medium temperature and medium pressure carbon dioxide from the second compressor (11). The methanol enters the methanol storage tank (10) for storage. Normal temperature and pressure air is introduced into the first compressor (1) for compression to obtain medium temperature and high pressure air. The medium temperature and high pressure air enters the methanol cracking heat exchanger (12) to release heat and cool down, providing heat for methanol cracking. The medium temperature and high pressure air becomes medium temperature and high pressure air. The medium temperature and high pressure air enters the first regenerator (4) for heat exchange and temperature rise, and then enters the first combustion chamber (5). Methanol in methanol storage tank (10) enters the methanol cracking heat exchanger (12) for cracking to obtain hydrogen and carbon monoxide. The hydrogen and carbon monoxide enter the first combustion chamber (5) for combustion to obtain a high temperature and high pressure first mixed gas. The high temperature and high pressure first mixed gas enters the first turbine (6) for expansion and work to drive the generator to generate electricity. At the same time, part of the kinetic energy generated by the expansion and work in the first turbine (6) drives the first compressor (1) to run. The first mixed gas after expansion and work enters the first regenerator (4) for heat exchange and cooling, and then enters the carbon capture device (20) for carbon dioxide capture.

5. The energy storage method based on a methanol fuel gas turbine according to claim 4, characterized in that, The ambient temperature low-pressure carbon dioxide has a temperature of 25℃~30℃ and a pressure of 3MPa~4MPa; the medium temperature medium-pressure carbon dioxide has a temperature of 85℃~110℃ and a pressure of 7.8MPa~8MPa; the liquid carbon dioxide has a temperature of 25℃~30℃ and a pressure of 7.8MPa~8MPa; the high temperature high pressure first mixed gas has a temperature of 1050℃~1150℃ and a pressure of 25MPa~35MPa; the medium temperature high pressure air has a temperature of 200℃~300℃ and a pressure of 600kPa~800kPa; the medium low temperature high pressure air has a temperature of 100℃~150℃ and a pressure of 600kPa~800kPa; and the high temperature high pressure second mixed gas has a temperature of 1100℃~1300℃ and a pressure of 600kPa~800kPa.

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