Multi-energy complementary type comprehensive energy utilization system based on combustion-driven booster station

Abstract

The invention discloses a multi-energy complementary comprehensive energy utilization system based on a combustion-driven booster station, which belongs to the technical field of energy storage comprehensive utilization and comprises a combustion-driven natural gas booster unit, a preheating type supercritical carbon dioxide circulating system, a compressed air energy storage system and a proton exchange membrane hydrogen production unit. Waste heat in the combustion-driven natural gas booster unit is used for heating a working medium of the preheating type supercritical carbon dioxide circulation system and preheating an expansion machine in the energy releasing process of the compressed air energy storage system, and meanwhile compression heat generated during energy storage of the compressed air energy storage system is used for heat exchange. During energy release, flue gas waste heat of an outlet of the expansion machine and waste heat of a carbon dioxide cooler of the preheating type supercritical carbon dioxide circulation system are used for heating water in the proton exchange membrane hydrogen production unit, and efficient gradient utilization of energy is achieved; the hydrogen-doped combustion is realized, the carbon dioxide emission of the combustion-driven natural gas booster unit is effectively reduced, and the environmental protection performance of the unit is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of comprehensive energy storage utilization, and in particular relates to a multi-energy complementary comprehensive energy utilization system based on a fuel-driven booster station. Background Art

[0002] To achieve long-distance natural gas transportation, long-distance natural gas pipelines primarily utilize fuel-driven compressor units to boost natural gas pressure. However, during operation, only approximately 35% of the fuel energy is converted into useful work. Approximately 25% of the fuel energy is carried away by the unit's cooling medium, and approximately 30% of the fuel energy is discharged with the flue gas. Energy losses through unit dissipation, including heat dissipation, account for approximately 10%. Of particular concern is the fact that approximately 30% of the fuel energy is discharged directly into the atmosphere along with the unit's flue gas. This not only wastes fuel energy but also generates thermal pollution. Furthermore, since fuel-driven compressor units are fueled by natural gas used by natural gas stations themselves, this significant energy waste also impacts the unit's economic performance.

[0003] However, the current domestic use of single-energy technology for waste heat recovery from fuel-driven compressor units is common. While some waste heat can be recovered, a significant amount remains unrecovered. Existing fuel-driven compressor units use natural gas as fuel, generating significant carbon dioxide emissions during operation, which in turn impacts the atmospheric environment. With the rapid development of renewable energy, the deployment of facilities such as photovoltaic power generation at natural gas stations has also attracted widespread attention. However, the inherent randomness and volatility of renewable energy poses significant challenges to the stable operation of natural gas station energy systems. Therefore, to achieve efficient and stable coupling of renewable energy and waste heat, additional energy storage units are needed.

[0004] In addition, during the winter supply guarantee period (November 15th to March 15th of the following year), fuel-driven compressor units need to operate continuously to ensure long-distance transportation of natural gas. However, during this period, due to the low ambient temperature and high air humidity, frost and blockage will occur at the air inlet of the fuel-driven compressor unit, causing the compressor unit to shut down, affecting the gas supply to downstream areas and causing losses to upstream purification plants due to a sudden drop in gas volume.

[0005] In view of the technical problems of insufficient utilization of waste heat from existing fuel-driven compressor units and easy frost and blockage of imported fuels during the winter supply period, it is urgent to establish a new comprehensive energy utilization system based on fuel-driven booster stations to achieve economical operation of the booster stations on the basis of efficient energy utilization. Summary of the Invention

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a multi-energy complementary integrated energy utilization system based on a fuel-driven booster station to solve the technical problems of insufficient utilization of waste heat of existing fuel-driven compressor units and easy frost and blockage of inlets during the winter supply period.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention discloses a multi-energy complementary comprehensive energy utilization system based on a fuel-driven boosting station, comprising: a fuel-driven natural gas boosting unit, a preheating supercritical carbon dioxide circulation system, a compressed air energy storage system, and a proton exchange membrane hydrogen production unit; One outlet end of the fuel-driven natural gas booster unit is connected to the compressed air energy storage system through a first three-way valve; the other outlet end of the fuel-driven natural gas booster unit and one outlet end of the compressed air energy storage system are connected to the preheating supercritical carbon dioxide circulation system through a second three-way valve; the other outlet end of the compressed air energy storage system is connected to the proton exchange membrane hydrogen production unit through a fourth three-way valve; one outlet end of the preheating supercritical carbon dioxide circulation system is connected to the fuel-driven natural gas booster unit and the atmosphere respectively through a third three-way valve, and the other outlet end of the preheating supercritical carbon dioxide circulation system is connected to the proton exchange membrane hydrogen production unit; the outlet end of the proton exchange membrane hydrogen production unit is connected to the fuel-driven natural gas booster unit, the compressed air energy storage system and the preheating supercritical carbon dioxide circulation system.

[0008] Preferably, the fuel-driven natural gas booster unit comprises an air compressor, a combustion chamber and a gas turbine connected in sequence along the air flow direction; The outlet end of the air compressor is connected to the inlet end of the combustion chamber, and the outlet end of the combustion chamber is connected to the inlet end of the gas turbine; the outlet end of the gas turbine is connected to the seventh three-way valve through the first three-way valve, one outlet end of the seventh three-way valve is connected to the inlet end of the first valve, the other outlet end of the seventh three-way valve is connected to the inlet end of the second valve, and the outlet end of the first valve is connected to the eighth three-way valve.

[0009] Further preferably, the fuel-driven natural gas booster unit also includes a flue gas heat exchanger; the outlet end of the second valve is connected to the flue gas heat exchanger; one outlet end of the flue gas heat exchanger is connected to the eighth three-way valve, and the other outlet end of the flue gas heat exchanger is connected to the atmosphere; the gas turbine is coaxially connected to the natural gas booster.

[0010] Preferably, the preheating supercritical carbon dioxide cycle includes a carbon dioxide compressor, a low-temperature flue gas heat exchanger, a high-temperature flue gas heat exchanger, a carbon dioxide turbine and a carbon dioxide regenerator connected in sequence along the air flow direction.

[0011] Further preferably, the outlet end of the carbon dioxide compressor is connected to the inlet end of the low-temperature flue gas heat exchanger and the inlet end of the carbon dioxide regenerator respectively through a sixth three-way valve; the outlet ends of the low-temperature flue gas heat exchanger and the carbon dioxide regenerator are connected to the inlet end of the high-temperature flue gas heat exchanger through a fifth three-way valve; the outlet end of the high-temperature flue gas heat exchanger is connected to the inlet end of the carbon dioxide turbine; and the outlet end of the carbon dioxide turbine is connected to the inlet end of the carbon dioxide regenerator.

[0012] More preferably, the preheating supercritical carbon dioxide cycle also includes a carbon dioxide cooler, one inlet end of the carbon dioxide cooler is connected to the carbon dioxide regenerator, and the other inlet end is connected to normal temperature water; the outlet end of the carbon dioxide cooler is connected to the proton exchange membrane hydrogen production unit, and the water vapor generated by the heat absorbed by the carbon dioxide cooler enters the proton exchange membrane hydrogen production unit.

[0013] Preferably, the compressed air energy storage unit includes a low-pressure air compressor, a first air heat exchanger, a high-pressure air compressor, a second air heat exchanger and an air storage device connected in sequence along the air flow direction.

[0014] Further preferably, the inlet end of the first air heat exchanger and the inlet end of the second air heat exchanger are connected to normal temperature water; the outlet end of the first air heat exchanger and the outlet end of the second air heat exchanger are connected to the proton exchange membrane hydrogen production unit through a fourth three-way valve; the water vapor at the outlet of the first air heat exchanger and the outlet of the second heat exchanger enters the proton exchange membrane hydrogen production unit through the fourth three-way valve.

[0015] Preferably, the compressed air energy storage unit also includes a third air heat exchanger, a high-pressure air expander, a fourth air heat exchanger, a low-pressure air expander and a fifth air heat exchanger connected in sequence along the air flow direction; the outlet end of the fifth air heat exchanger is connected to the fourth three-way valve.

[0016] Further preferably, the outlet of the fuel-driven natural gas booster unit is connected to the inlet of the fourth air heat exchanger, the outlet of the fourth air heat exchanger is connected to the inlet of the third air heat exchanger, and the outlet of the third air heat exchanger is connected to the air storage device.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a multi-energy complementary comprehensive energy utilization system based on a fuel-driven boosting station, in which the waste heat in the fuel-driven natural gas boosting unit is used for working fluid heating of a preheating supercritical carbon dioxide circulation system and for the preheating link of an expander in the energy release process of a compressed air energy storage system. After passing through the preheating supercritical carbon dioxide circulation system, the flue gas can be used to generate domestic hot water for external heating, and can also be used to prevent frosting before air enters the fuel-driven natural gas boosting unit. At the same time, the compression heat generated during energy storage in the compressed air energy storage system, the waste heat of the flue gas at the expander outlet during energy release, and the waste heat of the carbon dioxide cooler of the preheating supercritical carbon dioxide circulation system are also used for heating water in a proton exchange membrane hydrogen production unit, thereby realizing efficient cascade utilization of energy. The hydrogen generated by the proton exchange membrane hydrogen production unit enters the combustion chamber again, realizing hydrogen-blended combustion, which can effectively reduce the carbon dioxide emissions of the fuel-driven natural gas boosting unit and improve the environmental protection performance of the unit. This multi-energy complementary integrated energy utilization system based on a fuel-driven booster station utilizes waste heat and waste electricity to achieve efficient hydrogen production, which is then transported to the fuel-driven compressor unit, reducing the carbon dioxide emissions of the entire unit and solving the problem of insufficient waste heat utilization of the fuel-driven compressor unit. In addition, through the deep utilization of waste heat, the problem of easy frost and blockage of the inlet of the existing fuel-driven compressor unit during the winter supply guarantee period is solved. By coupling the compressed air energy storage system, the stable utilization of renewable energy is achieved. Through the efficient complementarity between multiple energy sources, it makes a great contribution to reducing carbon and air pollutants and greatly improves energy utilization. The present invention combines the compressed air energy storage system with the fuel-driven natural gas booster unit, which not only effectively solves the serious problem of the inability to efficiently utilize renewable energy in my country, but also effectively realizes the cascade utilization of energy through the carbon dioxide preheating supercritical carbon dioxide cycle and proton exchange membrane electrolysis hydrogen production technology. This not only improves energy utilization, but also reduces the emission of carbides and harmful gases, and has a good development prospect. The present invention utilizes part of the electricity from the carbon dioxide preheating supercritical carbon dioxide cycle for electrolytic hydrogen production, which not only realizes the efficient cascade utilization of the waste heat of the gas turbine flue gas, but also directly introduces the produced hydrogen into the combustion chamber of the fuel-driven natural gas booster unit, realizing the hydrogen-blended combustion of the fuel-driven natural gas booster unit, which can effectively reduce the carbon dioxide emissions of the fuel-driven natural gas booster unit and improve the environmental performance of the unit. By deeply recovering the waste heat of the gas turbine flue gas, the present invention can, on the basis of the important production task of ensuring the supply of natural gas to people's livelihood in winter, avoid the impact of unit shutdown on downstream gas supply and gas transmission losses, while reducing the safety impact caused by sudden gas outages in upstream purification plants and reducing the production costs of natural gas stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the overall structural diagram of the multi-energy complementary comprehensive energy utilization system based on the fuel-driven boosting station of the present invention.

[0019] 1. Air compressor; 2. Combustion chamber; 3. Gas turbine; 4. Natural gas booster; 5. CO2 compressor; 6. Low-temperature flue gas heat exchanger; 7. High-temperature flue gas heat exchanger; 8. CO2 turbine; 9. CO2 regenerator; 10. CO2 cooler; 11. Low-pressure air compressor; 12. First air heat exchanger; 13. High-pressure air compressor; 14. Second air heat exchanger; 15. Air storage device; 16. Third air exchanger. Heat exchanger; 17. High-pressure air expander; 18. Fourth air heat exchanger; 19. Low-pressure air expander; 20. Proton exchange membrane hydrogen production unit; 21. Flue gas heat exchanger; 22. First three-way valve; 23. Second three-way valve; 24. Third three-way valve; 25. Fourth three-way valve; 26. Fifth three-way valve; 27. Sixth three-way valve; 28. Seventh three-way valve; 29. ​​First valve; 30. Second valve; 31. Eighth three-way valve; 32. Fifth air heat exchanger. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] The present invention is described in further detail below with reference to the accompanying drawings: See also Figure 1This is the overall structural diagram of the multi-energy complementary comprehensive energy utilization system based on the fuel-driven boosting station of the present invention; it can be seen from the figure that the multi-energy complementary comprehensive energy utilization system based on the fuel-driven boosting station includes four modules, a fuel-driven natural gas boosting unit, a preheating supercritical carbon dioxide circulation system, a compressed air energy storage system and a proton exchange membrane hydrogen production unit 20. The four modules are connected by a three-way valve and a heat exchanger to realize the utilization of the flue gas waste heat between each other, forming an overall circulation system; the gas turbine 3 in the fuel-driven natural gas boosting unit is provided with a three-way valve, and the flue gas can flow into the two-stage heat exchanger working in the energy release process of the compressed air energy storage system through the third flow channel of the three-way valve, so that the gas released from the air storage device 15 is heated; the flue gas after combustion enters the preheating supercritical carbon dioxide circulation system with a three-way valve, the flue gas of the fuel-driven natural gas boosting unit and the compressed air energy storage system The gas flowing out of the third heat exchanger 16 of the system flows into the first and second flow channels of the three-way valve respectively, and both flow into the high-temperature flue gas heat exchanger 7 of the preheating supercritical carbon dioxide circulation system from the third flow channel; the high-temperature side outlet of the low-temperature flue gas heat exchanger 6 in the preheating supercritical carbon dioxide circulation system is provided with a three-way valve, the second flow channel of which is connected to the atmosphere and the waste heat can be used to generate domestic hot water for external heating. The third flow channel of the three-way valve is connected to the flue gas heat exchanger 21 before the air enters the fuel-driven natural gas booster unit. This waste heat can prevent the air from frosting before entering the fuel-driven natural gas booster unit; the preheating supercritical carbon dioxide circulation system is provided with a carbon dioxide cooler 10. The carbon dioxide cooler 10 and the compressed air energy storage system working in the energy storage mode both exchange heat with water, and the generated water vapor flows into the proton exchange membrane hydrogen production unit 20 for electrolytic hydrogen production. The hydrogen finally flows into the combustion chamber 2 to realize the hydrogen-blended combustion of the fuel-driven natural gas booster unit. The fuel-driven natural gas booster unit includes: an air compressor 1, a combustion chamber 2, a gas turbine 3, a natural gas booster 4, a flue gas heat exchanger 21, a seventh three-way valve 28, a first valve 29, a second valve 30, and an eighth three-way valve 31. The gas turbine 3 and the natural gas booster 4 are coaxially connected. The preheated supercritical carbon dioxide circulation system includes: a carbon dioxide compressor 5, a low-temperature flue gas heat exchanger 6, a high-temperature flue gas heat exchanger 7, a carbon dioxide turbine 8, a carbon dioxide regenerator 9, a carbon dioxide cooler 10, a fifth three-way valve 26, and a sixth three-way valve 27. The second flow channels of the fifth and sixth three-way valves 26 and 27 are connected to the outlet and inlet of the high-temperature side of the carbon dioxide regenerator 9, respectively. The compressed air energy storage unit includes: a low-pressure air compressor 11, a first air heat exchanger 12, a high-pressure air compressor 13, a second air heat exchanger 14, an air storage device 15, a third air heat exchanger 16, a high-pressure air expander 17, a fourth air heat exchanger 18 and a low-pressure air expander 19.

[0023] The present invention discloses a multi-energy complementary integrated energy utilization system based on a fuel-driven booster station, in which the gas turbine unit and the preheating supercritical carbon dioxide cycle are always in working condition; when the compressed air energy storage system is in the energy storage condition, the flue gas of the gas turbine directly enters the carbon dioxide cycle to generate electricity, and the waste heat of the carbon dioxide cycle carbon dioxide cooler 10 and the low-temperature side of the compressed air energy storage first heat exchanger 12 and the second heat exchanger 14 is used to heat the feed water to achieve electrolytic hydrogen production. When the compressed air energy storage system is in the stopped condition, the flue gas of the gas turbine directly enters the carbon dioxide cycle to generate electricity, and the carbon dioxide cycle carbon dioxide cooler 10 is used to heat the feed water to achieve electrolytic hydrogen production. When the compressed air energy storage system is in the energy release condition, the flue gas of the gas turbine first enters the compressed air energy storage system to preheat the turbine, and the waste heat of the carbon dioxide cycle carbon dioxide cooler 10 and the compressed air energy storage system low-pressure air expander 19 is used to heat the feed water to achieve electrolytic hydrogen production.

[0024] The present invention discloses a multi-energy complementary integrated energy utilization system based on a fuel-driven boosting station, comprising: a fuel-driven natural gas boosting unit, a preheating supercritical carbon dioxide circulation system, a compressed air energy storage system and a proton exchange membrane hydrogen production unit 20.

[0025] The fuel-driven natural gas booster unit includes: an air compressor 1, a combustion chamber 2, a gas turbine 3, a natural gas booster 4, a flue gas heat exchanger 21, a seventh three-way valve 28, a first valve 29, a second valve 30, and an eighth three-way valve 31.

[0026] The preheating supercritical carbon dioxide cycle includes: a carbon dioxide compressor 5, a low-temperature flue gas heat exchanger 6, a high-temperature flue gas heat exchanger 7, a carbon dioxide turbine 8, a carbon dioxide regenerator 9, a carbon dioxide cooler 10, a fifth three-way valve 26 and a sixth three-way valve 27.

[0027] The compressed air energy storage unit includes: a low-pressure air compressor 11, a first air heat exchanger 12, a high-pressure air compressor 13, a second air heat exchanger 14, an air storage device 15, a third air heat exchanger 16, a high-pressure air expander 17, a fourth air heat exchanger 18 and a low-pressure air expander 19.

[0028] One outlet end of the fuel-driven natural gas booster unit is connected to the compressed air energy storage system through the first three-way valve 22; the other outlet end of the fuel-driven natural gas booster unit and one outlet end of the compressed air energy storage system are connected to the preheating supercritical carbon dioxide circulation system through the second three-way valve 23; the other outlet end of the compressed air energy storage system is connected to the proton exchange membrane hydrogen production unit 20 through the fourth three-way valve 25; one outlet end of the preheating supercritical carbon dioxide circulation system is connected to the fuel-driven natural gas booster unit and the atmosphere respectively through the third three-way valve 24, and the other outlet end of the preheating supercritical carbon dioxide circulation system is connected to the proton exchange membrane hydrogen production unit 20; the outlet end of the proton exchange membrane hydrogen production unit 20 is connected to the fuel-driven natural gas booster unit, the compressed air energy storage system and the preheating supercritical carbon dioxide circulation system.

[0029] The fuel-driven natural gas booster unit includes an air compressor 1, a combustion chamber 2 and a gas turbine 3 connected in sequence along the air flow direction; The outlet end of the air compressor 1 is connected to the inlet end of the combustion chamber 2, and the outlet end of the combustion chamber 2 is connected to the inlet end of the gas turbine 3; the outlet end of the gas turbine 3 is connected to the seventh three-way valve 28 through the first three-way valve 22, one outlet end of the seventh three-way valve 28 is connected to the inlet end of the first valve 29, the other outlet end of the seventh three-way valve 28 is connected to the inlet end of the second valve 30, and the outlet end of the first valve 29 is connected to the eighth three-way valve 31.

[0030] The fuel-driven natural gas booster unit also includes a flue gas heat exchanger 21; the outlet end of the second valve 30 is connected to the flue gas heat exchanger 21; one outlet end of the flue gas heat exchanger 21 is connected to the eighth three-way valve 31, and the other outlet end of the flue gas heat exchanger 21 is connected to the atmosphere; the gas turbine 3 is coaxially connected to the natural gas booster 4.

[0031] The preheating supercritical carbon dioxide cycle includes a carbon dioxide compressor 5, a low-temperature flue gas heat exchanger 6, a high-temperature flue gas heat exchanger 7, a carbon dioxide turbine 8 and a carbon dioxide regenerator 9 which are sequentially connected along the air flow direction.

[0032] The outlet end of the carbon dioxide compressor 5 is connected to the inlet end of the low-temperature flue gas heat exchanger 6 and the inlet end of the carbon dioxide regenerator 9 respectively through the sixth three-way valve 27; the outlet ends of the low-temperature flue gas heat exchanger 6 and the carbon dioxide regenerator 9 are connected to the inlet end of the high-temperature flue gas heat exchanger 7 through the fifth three-way valve 26; the outlet end of the high-temperature flue gas heat exchanger 7 is connected to the inlet end of the carbon dioxide turbine 8; and the outlet end of the carbon dioxide turbine 8 is connected to the inlet end of the carbon dioxide regenerator 9.

[0033] The preheating supercritical carbon dioxide cycle also includes a carbon dioxide cooler 10, one inlet end of the carbon dioxide cooler 10 is connected to the carbon dioxide regenerator 9, and the other inlet end is connected to normal temperature water; the outlet end of the carbon dioxide cooler 10 is connected to the proton exchange membrane hydrogen production unit 20, and the water vapor generated by the heat absorbed by the carbon dioxide cooler 10 enters the proton exchange membrane hydrogen production unit 20.

[0034] The compressed air energy storage unit includes a low-pressure air compressor 11, a first air heat exchanger 12, a high-pressure air compressor 13, a second air heat exchanger 14 and an air storage device 15 which are sequentially connected along the air flow direction.

[0035] The inlet end of the first air heat exchanger 12 and the inlet end of the second air heat exchanger 14 are connected to normal temperature water; the outlet end of the first air heat exchanger 12 and the outlet end of the second air heat exchanger 14 are connected to the proton exchange membrane hydrogen production unit 20 through the fourth three-way valve 25; the water vapor at the outlet of the first air heat exchanger 12 and the outlet of the second heat exchanger 14 enters the proton exchange membrane hydrogen production unit 20 through the fourth three-way valve 25.

[0036] The compressed air energy storage unit also includes a third air heat exchanger 16, a high-pressure air expander 17, a fourth air heat exchanger 18, a low-pressure air expander 19 and a fifth air heat exchanger 32 connected in sequence along the air flow direction; the outlet end of the fifth air heat exchanger 32 is connected to the fourth three-way valve 25.

[0037] The outlet of the fuel-driven natural gas booster unit is connected to the inlet of the fourth air heat exchanger 18 , the outlet of the fourth air heat exchanger 18 is connected to the inlet of the third air heat exchanger 16 , and the outlet of the third air heat exchanger 16 is connected to the air storage device 15 .

[0038] The present invention is a system that combines compressed air energy storage, carbon dioxide preheating supercritical carbon dioxide circulation and electrolytic hydrogen production. Its working principle is: Fuel-driven natural gas booster module: When air temperatures are above 0°C, the air is compressed to a high-temperature, high-pressure state. Combustion is then completed in combustion chamber 2 with hydrogen from the proton exchange membrane hydrogen generator 20. The combusted gas enters gas turbine 3, where it expands and generates work, driving the coaxial natural gas booster 4. The flue gas from gas turbine 3 provides heat for other modules. When air temperatures are below 0°C, the waste heat from the flue gas, which has passed through the multi-stage heat exchangers of the preheated supercritical carbon dioxide circulation system, is used to heat the low-temperature air to prevent frost.

[0039] Preheating type supercritical carbon dioxide circulation system module: using supercritical carbon dioxide as the working fluid, the flue gas from other modules is used to heat the carbon dioxide flowing out of the carbon dioxide compressor 5, and then the carbon dioxide enters the carbon dioxide turbine 8 to drive the generator to generate electricity for the electrolytic hydrogen production reaction. The working fluid carbon dioxide passes through the regenerator and the cooler and returns to the carbon dioxide compressor 5 to enter the next cycle, and the water vapor generated by absorbing heat in the carbon dioxide cooler 10 enters the proton exchange membrane hydrogen production unit 20 to provide reactants for the electrolytic hydrogen production reaction.

[0040] Compressed air energy storage system module: During the energy storage process, air at normal pressure is compressed to high pressure, and cooling water cools the high-pressure air flowing through the intercooler. The water vapor formed after heating enters the proton exchange membrane hydrogen production unit 20 to provide reactants for electrolytic hydrogen production. The cooled high-pressure air is stored in the high-pressure air storage chamber. Multiple compressor units form a cascade system and share an electric motor; when the compressed air energy storage system module stops working, the water on the low-temperature side of the first heat exchanger 12 and the second heat exchanger 14 cannot absorb heat, and the supplementary water vapor in the proton exchange membrane hydrogen production unit 20 all comes from the water vapor flowing out of the low-temperature side of the carbon dioxide cooler 10 in the preheating supercritical carbon dioxide circulation system; during the power generation process, the preheated gas drives the generator through the air expander to generate electricity, and the waste heat of the flue gas of the low-pressure air expander 19 is used to heat the water.

[0041] Proton exchange membrane hydrogen production unit module: Utilizes the electricity generated by the preheating supercritical carbon dioxide circulation system and the water vapor generated by absorbing heat in the heat exchangers of other modules to carry out electrolytic hydrogen production reaction. The generated hydrogen flows into the combustion chamber 2 and mixes with high-pressure and high-temperature air to achieve hydrogen-blended combustion.

[0042] The combustion-driven natural gas booster unit, the preheated supercritical carbon dioxide cycle, and the proton exchange membrane hydrogen production unit 20 are always in operation.

[0043] When the ambient air temperature is higher than 0°C, the air compressor 1 compresses the air to a high-temperature and high-pressure state, and completes hydrogen blending and combustion with hydrogen from the proton exchange membrane hydrogen production unit 20 in the combustion chamber 2. The combusted gas enters the gas turbine 3 to expand and perform work, and drives the natural gas booster 4 coaxial with the gas turbine 3 to work. The high-temperature flue gas at the outlet of the gas turbine 3 flows through the first flow channel of the first three-way valve 22, the second flow channel of the first three-way valve 22, the first flow channel of the second three-way valve 23, and the third flow channel of the second three-way valve 23 in sequence to enter the high-temperature flue gas heat exchanger 7. The high-temperature flue gas passes through the high-temperature flue gas heat exchanger 7 and the low-temperature flue gas heat exchanger 6 in succession, and after two heat exchanges with the working medium carbon dioxide in the preheated supercritical carbon dioxide circulation system, it flows from the high-temperature side outlet of the low-temperature flue gas heat exchanger 6 into the first flow channel of the third three-way valve 24. The second flow channel of the third three-way valve 24 is connected to the atmosphere. The gas discharged to the atmosphere can be used to generate domestic hot water for external heating. When the ambient air temperature is lower than 0°C, in order to prevent frost on the working medium at the inlet of the air compressor 1, the flue gas at the flue gas outlet of the low-temperature flue gas heat exchanger 6 passes through the first flow channel and the third flow channel of the third three-way valve 24 in sequence and enters the flue gas heat exchanger 21 to preheat the low-temperature air from the environment.

[0044] In the preheating supercritical carbon dioxide circulation system, the gas at the outlet of the carbon dioxide compressor 5 enters the sixth three-way valve 27, flows out from the third flow channel, passes through the low-temperature flue gas heat exchanger 6, the first flow channel of the fifth three-way valve 26, the third flow channel of the fifth three-way valve 26, and the high-temperature flue gas heat exchanger 7 for heating and temperature increase. The second flow channels of the fifth three-way valve 26 and the sixth three-way valve 27 are respectively connected to the outlet and inlet ends of the high-temperature side of the carbon dioxide regenerator 9. Part of the gas at the outlet of the carbon dioxide compressor 5 flows from the second flow channel of the sixth three-way valve 27 through the high-temperature side of the carbon dioxide regenerator 9, and then enters the second flow channel of the fifth three-way valve 26 to merge with the carbon dioxide flowing out of the low-temperature side of the low-temperature flue gas heat exchanger 6. The merged carbon dioxide then enters the carbon dioxide turbine 8 to expand and generate power, and then flows through the carbon dioxide regenerator 9 and the carbon dioxide cooler 10 to re-enter the inlet end of the carbon dioxide compressor 5 to form a circulation system.

[0045] When the compressed air energy storage unit is in the energy storage operation state, the air from the environment enters the low-pressure air compressor 11 for pressurization, and then enters the air flow channel inlet of the first air heat exchanger 12. The cooled air enters the high-pressure air compressor 13 through the air flow channel outlet of the first air heat exchanger 12 to further increase the pressure. The high-temperature and high-pressure air at the outlet of the high-pressure air compressor 13 enters the air flow channel inlet of the second air heat exchanger 14, and the high-pressure and normal-temperature air at the air flow channel outlet of the second air heat exchanger 14 enters the air storage device 15 for energy storage; the flue gas at the outlet of the gas turbine 3 flows into the first flow channel of the first three-way valve 22, enters the first flow channel of the second three-way valve 23 through the second flow channel of the first three-way valve 22, and enters the preheating supercritical carbon dioxide circulation system through the third flow channel of the second three-way valve 23.

[0046] In the energy storage operation state of the compressed air energy storage unit, water at room temperature enters the carbon dioxide cooler 10, the first air heat exchanger 12, and the second heat exchanger 14. The heat generated by the carbon dioxide cooler 10, the first air heat exchanger 12, and the second heat exchanger 14 is used to heat the water entering the proton exchange membrane hydrogen production unit 20 until it becomes a water vapor state. The water vapor at the water outlet of the carbon dioxide cooler 10 directly enters the proton exchange membrane hydrogen production unit 20. The water vapor at the water outlet of the first air heat exchanger 12 and the water outlet of the second heat exchanger 14 passes through the second flow channel of the fourth three-way valve 25 and enters the proton exchange membrane hydrogen production unit 20 through the first flow channel of the fourth three-way valve 25. The hydrogen generated by the proton exchange membrane hydrogen production unit 20 enters the combustion chamber 2 and is mixed and burned with the natural gas entering the combustion chamber 2 in the combustion chamber 2, realizing hydrogen-blended combustion of the fuel-driven natural gas booster unit, which can effectively reduce the carbon dioxide emissions of the fuel-driven natural gas booster unit.

[0047] When the compressed air energy storage unit is in a stopped state, the flue gas of the gas turbine 3 directly enters the preheating supercritical carbon dioxide circulation system to generate electricity. The water vapor in the proton exchange membrane hydrogen production unit 20 comes from the water vapor flowing out of the low-temperature side of the carbon dioxide cooler 10 in the preheating supercritical carbon dioxide circulation system. The destination and use of the flue gas and hydrogen under this working condition are the same as those in the energy storage operation state of the above-mentioned compressed air energy storage unit.

[0048] When the compressed air energy storage unit is in the energy release operation state, the gas in the air storage device 15 first enters the low-temperature side of the third air heat exchanger 16. After the temperature is increased, the pressure is reduced by the high-pressure air expander 17. The air then enters the low-pressure air expander 19 through the low-temperature side of the fourth air heat exchanger 18 to expand and perform work. The air after performing work enters the fifth air heat exchanger 32. Water absorbs the waste heat of the air at the outlet of the low-pressure air expander 19 in the fifth air heat exchanger 32 and becomes water vapor. The water vapor enters the proton exchange membrane hydrogen production unit 20 through the third flow channel of the fourth three-way valve 25. While the above process is taking place, the flue gas from the fuel-driven natural gas booster unit flows out from the third flow channel of the first three-way valve 22 and flows through the fourth air heat exchanger 18 and the high-temperature side of the third air heat exchanger 16 to heat the air flowing out of the air storage device 15. The flue gas then flows through the second flow channel and the third flow channel of the second three-way valve 23 to enter the preheating supercritical carbon dioxide circulation system.

[0049] When the compressed air energy storage unit is in the energy release operation state, the flue gas of the gas turbine 3 flows out from the third flow channel of the first three-way valve 22, and first enters the compressed air energy storage system to preheat the expander. After the air flowing out of the air storage device 15 is heated and expanded in two stages, the waste heat of the flue gas at the outlet of the low-pressure air expander 19 is used to heat the water in the proton exchange membrane hydrogen production unit 20. The supplementary water vapor in the proton exchange membrane hydrogen production unit 20 comes from the water vapor flowing out of the low-temperature side of the carbon dioxide cooler 10 in the preheating supercritical carbon dioxide circulation system. The destination and use of the generated hydrogen are the same as those in the energy storage operation state of the above-mentioned compressed air energy storage unit.

[0050] The present invention discloses a multi-energy complementary comprehensive energy utilization system based on a fuel-driven boosting station, comprising four modules: a fuel-driven natural gas boosting unit, a preheating supercritical carbon dioxide circulation system, a compressed air energy storage system, and a proton exchange membrane hydrogen production unit 20; a three-way valve and a heat exchanger fully utilize the waste heat of different modules, and use the waste heat of the gas turbine 3 in the fuel-driven natural gas boosting unit for working medium heating of the preheating supercritical carbon dioxide circulation system and for the preheating link of the expander in the energy release process of the compressed air energy storage system; after the flue gas passes through the preheating supercritical carbon dioxide circulation system, it can be used to generate Domestic hot water is supplied to the outside for heating, and can also be used to prevent frost from forming before the air enters the fuel-driven natural gas booster unit. At the same time, the compression heat generated when the compressed air energy storage system stores energy, the waste heat of the flue gas at the expander outlet when releasing energy, and the waste heat of the carbon dioxide cooler 10 of the preheating supercritical carbon dioxide circulation system are used to heat the water in the proton exchange membrane hydrogen production unit 20, thereby realizing efficient cascade utilization of energy. The hydrogen produced by the proton exchange membrane hydrogen production unit 20 enters the combustion chamber 2 again, realizing hydrogen-blended combustion, which can effectively reduce the carbon dioxide emissions of the fuel-driven natural gas booster unit and improve the environmental performance of the unit.

[0051] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A multi-energy complementary integrated energy utilization system based on a fuel-driven booster station, characterized in that: include: Combustion-driven natural gas booster unit, preheated supercritical carbon dioxide circulation system, compressed air energy storage system and proton exchange membrane hydrogen production unit (20); One outlet end of the fuel-driven natural gas booster unit is connected to the compressed air energy storage system through a first three-way valve (22); the other outlet end of the fuel-driven natural gas booster unit and one outlet end of the compressed air energy storage system are connected to the preheating supercritical carbon dioxide circulation system through a second three-way valve (23); the other outlet end of the compressed air energy storage system is connected to the proton exchange membrane hydrogen production unit (20) through a fourth three-way valve (25); one outlet end of the preheating supercritical carbon dioxide circulation system is connected to the fuel-driven natural gas booster unit and the atmosphere through a third three-way valve (24), and the other outlet end of the preheating supercritical carbon dioxide circulation system is connected to the proton exchange membrane hydrogen production unit (20); the outlet end of the proton exchange membrane hydrogen production unit (20) is connected to the fuel-driven natural gas booster unit, the compressed air energy storage system and the preheating supercritical carbon dioxide circulation system.

2. The multi-energy complementary integrated energy utilization system based on a fuel-driven boosting station according to claim 1 is characterized in that: The fuel-driven natural gas booster unit comprises an air compressor (1), a combustion chamber (2), and a gas turbine (3) connected in sequence along the airflow direction; The outlet end of the air compressor (1) is connected to the inlet end of the combustion chamber (2), and the outlet end of the combustion chamber (2) is connected to the inlet end of the gas turbine (3); the outlet end of the gas turbine (3) is connected to the seventh three-way valve (28) through the first three-way valve (22), one outlet end of the seventh three-way valve (28) is connected to the inlet end of the first valve (29), the other outlet end of the seventh three-way valve (28) is connected to the inlet end of the second valve (30), and the outlet end of the first valve (29) is connected to the eighth three-way valve (31).

3. The multi-energy complementary integrated energy utilization system based on a fuel-driven boosting station according to claim 2 is characterized in that: The fuel-driven natural gas booster unit further comprises a flue gas heat exchanger (21); the outlet end of the second valve (30) is connected to the flue gas heat exchanger (21); one outlet end of the flue gas heat exchanger (21) is connected to the eighth three-way valve (31), and the other outlet end of the flue gas heat exchanger (21) is connected to the atmosphere; the gas turbine (3) is coaxially connected to the natural gas booster (4).

4. The multi-energy complementary integrated energy utilization system based on a fuel-driven booster station according to claim 1 is characterized in that: The preheating supercritical carbon dioxide cycle comprises a carbon dioxide compressor (5), a low-temperature flue gas heat exchanger (6), a high-temperature flue gas heat exchanger (7), a carbon dioxide turbine (8) and a carbon dioxide regenerator (9) which are sequentially connected along the airflow direction.

5. The multi-energy complementary integrated energy utilization system based on a fuel-driven boosting station according to claim 4 is characterized in that: The outlet end of the carbon dioxide compressor (5) is connected to the inlet end of the low-temperature flue gas heat exchanger (6) and the inlet end of the carbon dioxide regenerator (9) respectively through the sixth three-way valve (27); the outlet ends of the low-temperature flue gas heat exchanger (6) and the carbon dioxide regenerator (9) are connected to the inlet end of the high-temperature flue gas heat exchanger (7) through the fifth three-way valve (26); the outlet end of the high-temperature flue gas heat exchanger (7) is connected to the inlet end of the carbon dioxide turbine (8); and the outlet end of the carbon dioxide turbine (8) is connected to the inlet end of the carbon dioxide regenerator (9).

6. The multi-energy complementary integrated energy utilization system based on a fuel-driven boosting station according to claim 5 is characterized in that: The preheating supercritical carbon dioxide cycle further comprises a carbon dioxide cooler (10), one inlet end of the carbon dioxide cooler (10) is connected to the carbon dioxide regenerator (9), and the other inlet end is connected to normal temperature water; the outlet end of the carbon dioxide cooler (10) is connected to the proton exchange membrane hydrogen production unit (20), and the water vapor generated by the carbon dioxide cooler (10) absorbing heat enters the proton exchange membrane hydrogen production unit (20).

7. The multi-energy complementary integrated energy utilization system based on a fuel-driven boosting station according to claim 1 is characterized in that: The compressed air energy storage unit comprises a low-pressure air compressor (11), a first air heat exchanger (12), a high-pressure air compressor (13), a second air heat exchanger (14), and an air storage device (15) which are sequentially connected along an airflow direction.

8. The multi-energy complementary integrated energy utilization system based on a fuel-driven boosting station according to claim 7 is characterized in that: The inlet end of the first air heat exchanger (12) and the inlet end of the second air heat exchanger (14) are connected to normal temperature water; the outlet end of the first air heat exchanger (12) and the outlet end of the second air heat exchanger (14) are connected to the proton exchange membrane hydrogen production unit (20) through a fourth three-way valve (25); and the water vapor at the outlet of the first air heat exchanger (12) and the outlet of the second heat exchanger (14) enters the proton exchange membrane hydrogen production unit (20) through the fourth three-way valve (25).

9. The multi-energy complementary integrated energy utilization system based on a fuel-driven booster station according to claim 1, characterized in that: The compressed air energy storage unit further comprises a third air heat exchanger (16), a high-pressure air expander (17), a fourth air heat exchanger (18), a low-pressure air expander (19), and a fifth air heat exchanger (32) connected in sequence along the air flow direction; the outlet end of the fifth air heat exchanger (32) is connected to a fourth three-way valve (25).

10. The multi-energy complementary integrated energy utilization system based on a fuel-driven boosting station according to claim 9, characterized in that: The outlet end of the fuel-driven natural gas booster unit is connected to the inlet end of the fourth air heat exchanger (18), the outlet end of the fourth air heat exchanger (18) is connected to the inlet end of the third air heat exchanger (16), and the outlet end of the third air heat exchanger (16) is connected to the air storage device (15).

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