Gas turbine hydrogen doping system adopting multi-stage hydrogen storage and regulation and control method thereof

Abstract

The invention discloses a gas turbine hydrogen doping system adopting multi-stage hydrogen storage and a regulation and control method thereof. The system comprises a renewable energy power generation device, an electrolytic hydrogen production device, a multi-stage hydrogen storage and multi-path hydrogen supply device and a gas turbine power generation device which are connected in sequence. Wherein the renewable energy power generation device generates electric energy through wind and light energy conversion, the electric energy is preferentially accessed to a power grid, and surplus electric energy is absorbed by the water electrolysis hydrogen production device; an electrolytic hydrogen production device for generating hydrogen by electrolyzing water with excess electric energy; the multi-stage hydrogen storage and multi-path hydrogen supply device is used for realizing efficient hierarchical storage and flexible allocation of hydrogen energy; the gas turbine power generation device is used for dynamically regulating and controlling the hydrogen doping proportion of natural gas to achieve hydrogen energy absorption and flexible power supply, and meanwhile flexible peak regulation is achieved through load regulation. According to the multi-stage hydrogen storage device, flexible regulation and control of hydrogen storage and release in the hydrogen production process through water electrolysis and the hydrogen doping process of the gas turbine are achieved, and the absorption capacity of renewable energy sources is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of multi - stage hydrogen storage and multi - path hydrogen supply, and particularly to a gas turbine hydrogen - blending system adopting multi - stage hydrogen storage and its control method. Background Art

[0002] The global energy pattern faces major challenges. Energy consumption is continuously growing, greenhouse gas emissions are increasing, and the growth of the global population has deepened this challenge. In China, the installed capacity of wind and solar power has been increasing year by year. However, renewable energy sources such as solar and wind energy are affected by technology and the environment, fluctuating periodically and unpredictably on time scales of day and night, months, and seasons, resulting in a large mismatch with load demand, having a great impact on the power system, and causing problems such as difficult accommodation of renewable energy. As an energy carrier, hydrogen has the advantages of flexible energy storage scale and seasonal energy storage, etc., and can play a role in smoothing the fluctuations of renewable energy and improving the accommodation of renewable energy in the power system. Using hydrogen as a medium for storing and transporting energy, converting renewable energy into a form that is easier to store, transfer, and use, is a promising way to solve the problem of difficult accommodation of wind and solar power. Compared with coal - fired units, gas turbines show great advantages in terms of start - stop speed, load - rising and - falling rate, and pollutant emissions, and play a very important role in the energy structure. Given the zero - carbon - emission characteristic of hydrogen during the combustion process, it can be used as an ideal alternative fuel for gas turbines.

[0003] In traditional integrated wind - solar - hydrogen energy systems, the utilization of hydrogen is mostly linear hydrogen supply, which is prone to hydrogen supply interruption due to local failures, and it is difficult to adapt to the intermittency of wind and solar power generation and the dynamic changes in hydrogen demand, lacking a multi - path hydrogen supply method; traditional hydrogen storage systems mostly have a single pressure level, which is difficult to quickly respond to the fluctuating demand of wind and solar power generation, easily leading to problems such as too long peak - shaving response time or too large space occupied by equipment; and traditional peak - shaving only relies on changing the regulating ability of gas turbines, making it difficult to respond to sudden fluctuations or emergency peak - shaving demands of wind and solar power, and it is difficult to exert the flexibility advantage of the system.

[0004] Therefore, proposing a gas turbine hydrogen - blending system adopting multi - stage hydrogen storage and its control method to solve the difficulties existing in the prior art is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a gas turbine hydrogen - blending system adopting multi - stage hydrogen storage and its control method, which is used to meet the peak - shaving demand of the power grid, improve the flexibility of the system and the accommodation ability of renewable energy, and take into account carbon emission reduction.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] A hydrogen - blended gas turbine system using multi - stage hydrogen storage, comprising a renewable energy power generation device, an electrolytic hydrogen production device, a multi - stage hydrogen storage and multi - path hydrogen supply device, and a gas turbine power generation device connected in sequence; wherein:

[0008] The renewable energy power generation device is used to generate electric energy through the conversion of wind and solar energy. The electric energy is preferentially connected to the power grid. When the generated electricity meets the grid demand, the excess electric energy is consumed by the electrolytic water hydrogen production device;

[0009] The electrolytic hydrogen production device is used to produce hydrogen by electrolyzing water with excess electric energy;

[0010] The multi - stage hydrogen storage and multi - path hydrogen supply device is used to achieve efficient hierarchical storage and flexible allocation of hydrogen energy. Through pressure level division and redundant hydrogen supply path design, it can meet the requirements of rapid peak - shaving response of gas turbines and the accommodation of the volatility of renewable energy at the same time;

[0011] The gas turbine power generation device is used to dynamically regulate the proportion of hydrogen - blended natural gas to achieve hydrogen energy consumption and flexible power supply, and at the same time achieve flexible peak - shaving through load regulation.

[0012] Preferably, the renewable energy power generation device includes a photovoltaic power generation unit and a wind power generation unit; the photovoltaic power generation unit and the wind power generation unit are respectively connected to the power grid through an AC bus. A part of the electric energy generated by the photovoltaic power generation unit and the wind power generation unit is input into the power grid through the AC bus, and the other part is input into the electrolytic hydrogen production device through the AC bus to produce hydrogen by electrolyzing water;

[0013] Among them, the photovoltaic power generation unit includes a photovoltaic power generation set, a photovoltaic transformer, and a DC / AC converter connected in sequence, and the wind power generation unit includes a wind power generation set and a wind power transformer connected in sequence.

[0014] Preferably, the electrolytic hydrogen production device includes a disconnector, a transformer 1, an AC / DC converter, an electrolytic cell, and a hydrogen purification device connected in sequence. The electrolytic hydrogen production device is connected to the multi - stage hydrogen storage and multi - path hydrogen supply device through the hydrogen purification device.

[0015] Preferably, the multi - stage hydrogen storage and multi - path hydrogen supply device includes an intelligent flow - dividing valve, a hydrogen compression unit, a low - pressure hydrogen storage tank, a medium - pressure hydrogen storage tank, a high - pressure hydrogen storage tank, and a hydrogen - blended premixer; among them, a hydrogen compression unit and a hydrogen - blended premixer are sequentially arranged on the first pipeline for outputting hydrogen by the intelligent flow - dividing valve; the hydrogen compression unit includes a hydrogen compressor 1, a hydrogen compressor 2, and a hydrogen compressor 3 arranged in sequence. A low - pressure hydrogen storage tank and a hydrogen flow control valve 1 are sequentially arranged between the hydrogen compressor 1 and the first pipeline, a medium - pressure hydrogen storage tank and a hydrogen flow control valve 2 are sequentially arranged between the hydrogen compressor 2 and the first pipeline, and a high - pressure hydrogen storage tank and a hydrogen flow control valve 3 are sequentially arranged between the hydrogen compressor 3 and the first pipeline;

[0016] A pressure grading valve 1 is provided between hydrogen compressor 1 and hydrogen compressor 2, and a pressure grading valve 2 is provided between hydrogen compressor 2 and hydrogen compressor 3; a grading pressure reducing valve group is provided on the first pipeline; the intelligent flow dividing valve is connected to the hydrogen-doped premixer through the second pipeline for outputting hydrogen, and a proportional regulating valve is provided on the second pipeline; a natural gas flow control valve is provided on the pipeline for inputting natural gas into the hydrogen-doped premixer.

[0017] Preferably, after the selection of pressure grading valve 1 and pressure grading valve 2, the hydrogen is sent to the high-pressure hydrogen storage tank, medium-pressure hydrogen storage tank and low-pressure hydrogen storage tank for storage respectively according to the results of the current optimized scheduling control: when it is predicted that the wind and solar power is sufficient, the high-pressure hydrogen storage tank is preferentially filled with hydrogen; when it is predicted that there is a rapid peak shaving demand, the low-pressure hydrogen storage tank is preferentially used to store hydrogen; when there is an emergency peak shaving demand, the hydrogen in the low-pressure hydrogen storage tank is preferentially used. After the hydrogen in the low-pressure tank is exhausted, the hydrogen in the medium-pressure tank and high-pressure tank is used in turn. The hydrogen flow is controlled by hydrogen flow control valve 1, hydrogen flow control valve 2 and hydrogen flow control valve 3, and through a group of series-connected grading pressure reducing valve groups, the hydrogen pressure is gradually reduced to the fuel supply pressure of the gas turbine and sent into the hydrogen-doped premixer to be mixed with natural gas. The natural gas flow control valve controls the natural gas flow, and the fuel quantity and the hydrogen doping ratio of natural gas sent into the combustion chamber are jointly controlled by controlling the valve opening.

[0018] Preferably, the gas turbine power generation device includes a compressor, a combustion chamber, a turbine, a generator, and a transformer 2 arranged in sequence. The multi-stage hydrogen storage and multi-path hydrogen supply device is connected to the combustion chamber of the gas turbine power generation device through a hydrogen-doped premixer.

[0019] A regulation method for a gas turbine hydrogen-doping system using multi-stage hydrogen storage based on any one of the above, the regulation method includes:

[0020] Case 1: When the wind and solar energy is sufficient and there is still surplus after power generation meets the grid load: the gas turbine shuts down. At this time, the valve switch of the intelligent flow dividing valve leading to the hydrogen-doped premixer is closed, and the natural gas flow control valve is closed; the disconnector is opened, and the electrolyzer is started. The excess electric energy generated by wind and solar power generation is used to produce hydrogen by electrolyzing water. The hydrogen is sequentially converted into hydrogen storage through a hydrogen purification device and a gas compressor unit. The flow direction of hydrogen is optimized by the current optimized scheduling control: when it is predicted that the wind and solar power is sufficient, the high-pressure hydrogen storage tank is filled with hydrogen; when it is predicted that there is a rapid peak shaving demand, the low-pressure hydrogen storage tank is used to store hydrogen;

[0021] Case 2: When the wind and solar energy are insufficient, that is, when the electricity generated by wind and solar cannot meet the grid load demand: Open the valve switch of the intelligent flow divider leading to the hydrogen-doped pre-mixer and the natural gas flow control valve to mix hydrogen and natural gas at a certain hydrogen doping ratio; Increase the fuel quantity added to the gas turbine according to the specific grid load demand, and gradually reduce the power of the electrolyzer until it is shut down as the load increases. At this time, the disconnector is disconnected; At the same time, open the hydrogen flow valve of the hydrogen storage tank, give priority to using the hydrogen in the low-pressure hydrogen storage tank, and then use the hydrogen in the medium-pressure hydrogen storage tank and the high-pressure hydrogen storage tank in sequence after the hydrogen in the low-pressure hydrogen storage tank is exhausted. The hydrogen pressure is reduced to the working pressure of the combustion chamber through the step-down pressure reducing valve group and then enters the hydrogen-doped pre-mixer to be pre-mixed with natural gas in a certain proportion and then sent to the combustion chamber for combustion. The power generation of the gas turbine is used to meet the system peak shaving demand;

[0022] Case 3: When the grid load demand suddenly drops during the peak shaving process: First, reduce the valve opening of the intelligent flow divider leading to the hydrogen-doping module and the valve opening of the natural gas flow control valve, reduce the fuel quantity entering the gas turbine, and reduce the power generation power of the gas turbine; At the same time, gradually increase the hydrogen production power of the electrolyzer; Send the produced hydrogen into the hydrogen storage tank for storage; After the system meets the grid peak shaving demand, the gas turbine shuts down, and all hydrogen flow control valves and natural gas flow control valves are closed.

[0023] According to the specific embodiments provided by the present invention, the following technical effects are disclosed by the present invention:

[0024] (1) The gas turbine hydrogen-doping system and method using multi-stage hydrogen storage proposed by the present invention, in terms of system structure design, the design of multi-path hydrogen supply enables hydrogen to bypass other paths when a single-point failure occurs in the system, improving the system reliability; The multi-stage hydrogen storage method is different from the traditional single-stage hydrogen storage, that is, hydrogen is sent into high-pressure, medium-pressure and low-pressure hydrogen storage tanks for storage respectively according to the results of day-ahead optimal scheduling control: When it is predicted that the wind and solar power are sufficient, the high-pressure hydrogen storage tank is preferentially filled with hydrogen; When it is predicted that there is a rapid peak shaving demand, the low-pressure hydrogen storage tank is preferentially used for hydrogen storage, and in cooperation with the step-down pressure reducing valve group, while improving the system response speed, the capacity of the hydrogen storage equipment is saved, and the economy of the system is improved.

[0025] (2) Compared with the traditional system peak shaving that only relies on adjusting the fuel quantity of the gas turbine, this system adapts to wind and solar fluctuations and meets the grid peak shaving demand by adjusting the hydrogen production power of the electrolyzer and the power of the gas turbine, improving the consumption capacity of renewable energy, avoiding energy waste under the low-load state of the gas turbine, maintaining the excellent variable-load performance of the system, broadening the system power output range, and improving the system's ability to adapt to external load changes. Brief Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0027] Figure 1 The structural diagram of a hydrogen - doped gas turbine system using multi - stage hydrogen storage provided by the present invention;

[0028] Among them, 1. Photovoltaic power generation unit; 2. Photovoltaic transformer; 3. Wind power generation unit; 4. Wind power transformer; 5. DC / AC converter; 6. Isolating switch; 7. Transformer 1; 8. AC / DC converter; 9. Electrolyzer; 10. Hydrogen purification device; 11. Intelligent flow - dividing valve; 12. Proportioning regulating valve; 13. Hydrogen compressor 1; 14. Hydrogen compressor 2; 15. Hydrogen compressor 3; 16. Pressure - grading valve 1; 17. Pressure - grading valve 2; 18. Low - pressure hydrogen storage tank; 19. Medium - pressure hydrogen storage tank; 10. High - pressure hydrogen storage tank; 21. Hydrogen flow control valve 1; 22. Hydrogen flow control valve 2; 23. Hydrogen flow control valve 3; 24. Graded pressure - reducing valve group; 25. Hydrogen - doped premixer; 26. Natural gas flow control valve; 27. Compressor; 28. Combustion chamber; 29. Turbine; 30. Generator; 31. Transformer 2; 32. Circuit breaker. Detailed implementation manners

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0031] As Figure 1 shown, a hydrogen - doped gas turbine system using multi - stage hydrogen storage provided by the present invention includes a renewable energy power generation device, an electrolytic hydrogen production device, a multi - stage hydrogen storage and multi - path hydrogen supply device, and a gas turbine power generation device connected in sequence; among them:

[0032] The renewable energy power generation device is used to generate electric energy through the conversion of wind and light energy. The electric energy is preferentially connected to the power grid. When the generated electricity meets the power grid demand, the excess electric energy is consumed by the electrolytic water hydrogen production device.

[0033] An electrolytic hydrogen production device for producing hydrogen by electrolyzing water with excess electric energy;

[0034] A multi-stage hydrogen storage and multi-path hydrogen supply device for realizing efficient hierarchical storage and flexible allocation of hydrogen energy. Through pressure level division and redundant hydrogen supply path design, it can meet the requirements of rapid peak shaving response of gas turbines and the accommodation of renewable energy volatility at the same time;

[0035] A gas turbine power generation device for dynamically regulating the hydrogen blending ratio of natural gas to achieve hydrogen energy consumption and flexible power supply, and at the same time realizing flexible peak shaving through load regulation.

[0036] Furthermore, the renewable energy power generation device includes a photovoltaic power generation unit and a wind power generation unit; the photovoltaic power generation unit and the wind power generation unit are respectively connected to the power grid through an AC bus, and a circuit breaker 32 is arranged on the AC bus connected to the power grid; a part of the electric energy generated by the photovoltaic power generation unit and the wind power generation unit is input into the power grid through the AC bus, and the other part is input into the electrolytic hydrogen production device through the AC bus for producing hydrogen by electrolyzing water;

[0037] Among them, the photovoltaic power generation unit includes a photovoltaic power generation set 1, a photovoltaic transformer 2, and a DC / AC converter 5 connected in sequence, and the wind power generation unit includes a wind power generation set 3 and a wind power transformer 4 connected in sequence.

[0038] Even further, the electrolytic hydrogen production device includes a disconnecting switch 6, a transformer 7, an AC / DC converter 8, an electrolytic cell 9, and a hydrogen purification device 10 connected in sequence. The electrolytic hydrogen production device is connected to the multi-stage hydrogen storage and multi-path hydrogen supply device through the hydrogen purification device 10.

[0039] Still further, the multi-stage hydrogen storage and multi-path hydrogen supply device includes an intelligent flow dividing valve 11, a hydrogen compression unit, a low-pressure hydrogen storage tank 18, a medium-pressure hydrogen storage tank 19, a high-pressure hydrogen storage tank 20, and a hydrogen blending pre-mixer 25; among them, a hydrogen compression unit and a hydrogen blending pre-mixer 25 are arranged in sequence on the first pipeline for outputting hydrogen by the intelligent flow dividing valve; the hydrogen compression unit includes a first hydrogen compressor 13, a second hydrogen compressor 14, and a third hydrogen compressor 15 arranged in sequence. A low-pressure hydrogen storage tank 18 and a first hydrogen flow control valve 21 are arranged in sequence between the first hydrogen compressor 13 and the first pipeline, a medium-pressure hydrogen storage tank 19 and a second hydrogen flow control valve 22 are arranged in sequence between the second hydrogen compressor 14 and the first pipeline, and a high-pressure hydrogen storage tank 20 and a third hydrogen flow control valve 23 are arranged in sequence between the third hydrogen compressor 15 and the first pipeline;

[0040] A pressure grading valve 16 is provided between the first hydrogen compressor 13 and the second hydrogen compressor 14, and a pressure grading valve 17 is provided between the second hydrogen compressor 14 and the third hydrogen compressor 15; a grading pressure reducing valve group 24 is provided on the first pipeline; the intelligent flow dividing valve 11 is connected to the hydrogen-doped premixer 25 through a second pipeline for outputting hydrogen, and a proportional regulating valve 12 is provided on the second pipeline; a natural gas flow control valve 26 is provided on the pipeline for inputting natural gas to the hydrogen-doped premixer 25.

[0041] Specifically, the renewable energy power generated by the photovoltaic power generation unit 1 and the wind power generation unit 3 is preferentially fed into the grid, and the excess electricity is used for hydrogen production by electrolyzing water; the hydrogen produced is purified by the hydrogen purification device 10 and then, judged according to the actual situation, is preferentially fed into the hydrogen-doped premixer 25 through the intelligent flow dividing valve 11 to be mixed with natural gas for hydrogen-doped combustion of the gas turbine.

[0042] Furthermore, the remaining hydrogen is stored in stages. Judged according to the results of day-ahead optimal control, after the selection of the pressure grading valve 16 and the pressure grading valve 17, the hydrogen is compressed by the hydrogen compression unit and fed into the low-pressure hydrogen storage tank 18 (30 MPa), the medium-pressure hydrogen storage tank 19 (70 MPa), and the high-pressure hydrogen storage tank 20 (100 MPa) for storage respectively; when it is predicted that the wind and solar power are sufficient, the high-pressure hydrogen storage tank 20 is preferentially filled for hydrogen storage; when it is predicted that there is a rapid peak shaving demand, the low-pressure hydrogen storage tank 18 is preferentially used for hydrogen storage; when there is an emergency peak shaving demand, the hydrogen in the low-pressure hydrogen storage tank 18 is preferentially used. After the hydrogen in the low-pressure hydrogen storage tank 18 is exhausted, the hydrogen in the medium-pressure hydrogen storage tank 19 and the high-pressure hydrogen storage tank 20 is used in turn. The hydrogen flow is controlled by the first hydrogen flow control valve 21, the second hydrogen flow control valve 22, and the third hydrogen flow control valve 23, and after passing through a group of series-connected grading pressure reducing valve groups 24, the hydrogen pressure is gradually reduced to the fuel supply pressure of the gas turbine and fed into the hydrogen-doped premixer 25 to be mixed with natural gas. The natural gas flow control valve 26 controls the natural gas flow, and the fuel amount fed into the combustion chamber 28 and the hydrogen-doping ratio of natural gas are jointly controlled by controlling the valve opening. The hydrogen-doped combustion of the gas turbine cooperates with the wind and solar power generation to meet the grid peak shaving demand.

[0043] Furthermore, the gas turbine power generation device includes a compressor 27, a combustion chamber 28, a turbine 29, a generator 30, and a second transformer 31 arranged in sequence. The multi-stage hydrogen storage and multi-path hydrogen supply device is connected to the combustion chamber 28 of the gas turbine power generation device through the hydrogen-doped premixer 25.

[0044] A regulation method for a gas turbine hydrogen-doped system using multi-stage hydrogen storage based on any one of the above, the regulation method includes:

[0045] Case 1: When there is sufficient wind and solar energy and there is still surplus power after power generation meets the grid load: The gas turbine shuts down. At this time, the valve switch of the intelligent diverter valve 11 leading to the hydrogen-doped premixer 25 is closed, and the natural gas flow control valve 26 is closed. The disconnect switch 6 is turned on, and the electrolyzer 9 is started. The excess electric energy generated by wind and solar power is used to produce hydrogen by electrolyzing water. The hydrogen is successively converted into hydrogen storage through the hydrogen purification device 10 and the gas compressor unit. The flow direction of hydrogen is determined by day-ahead control optimization: When it is predicted that there is sufficient wind and solar power, the high-pressure hydrogen storage tank 20 is preferentially filled for hydrogen storage; when it is predicted that there is a rapid peak shaving demand, the low-pressure hydrogen storage tank 18 is preferentially used for hydrogen storage.

[0046] Case 2: When the wind and solar energy are insufficient, that is, the power generated by wind and solar cannot meet the grid load demand: Open the valve switch of the intelligent diverter valve 11 leading to the hydrogen-doped premixer 25 and the natural gas flow control valve 26 to mix hydrogen and natural gas at a certain hydrogen doping ratio; increase the fuel amount added to the gas turbine according to the specific grid load demand, and gradually reduce the power of the electrolyzer 9 until it is turned off as the load increases. At this time, the disconnect switch 6 is disconnected; when the hydrogen is insufficient, the hydrogen flow valve of the hydrogen storage tank can be opened, and the hydrogen stored in the low-pressure hydrogen storage tank 18 is preferentially used. After the hydrogen in the low-pressure hydrogen storage tank 18 is exhausted, the hydrogen in the medium-pressure hydrogen storage tank 19 and the high-pressure hydrogen storage tank 20 is used in turn. The hydrogen pressure is reduced to the working pressure of the combustion chamber 28 through the step-down pressure reducing valve group 24 (100 MPa - 70 MPa - 30 MPa - 3 MPa) and then enters the hydrogen-doped premixer 25 to be pre-mixed with natural gas in a certain proportion and then sent to the combustion chamber 28 for combustion. The gas turbine generates electricity to meet the system peak shaving demand.

[0047] Case 3: When the grid load demand suddenly drops during the peak shaving process: In this case, first reduce the valve opening of the part of the intelligent diverter valve 11 leading to the hydrogen doping module and the natural gas flow control valve 26, reduce the fuel amount entering the gas turbine, and reduce the power generation power of the gas turbine; at the same time, gradually increase the hydrogen production power of the electrolyzer 9. The hydrogen produced is sent to the hydrogen storage tank for storage. When the system meets the grid peak shaving demand, the gas turbine shuts down, and all hydrogen flow control valves and the natural gas flow control valve 26 are closed.

[0048] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0049] In this article, specific examples are used to illustrate the principles and implementation modes of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation modes and application scopes. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A hydrogen - doped gas turbine system using multi - stage hydrogen storage, characterized in that, It includes a renewable energy power generation device, an electrolytic hydrogen production device, a multi-stage hydrogen storage and multi-path hydrogen supply device, and a gas turbine power generation device connected in sequence; wherein: The renewable energy power generation device is used to generate electric energy through the conversion of wind and solar energy. The electric energy is preferentially connected to the power grid. When the power generation meets the grid demand, the surplus electric energy is consumed by the electrolytic water hydrogen production device; The electrolytic hydrogen production device is used to electrolyze water through surplus electric energy to produce hydrogen; The multi-stage hydrogen storage and multi-path hydrogen supply device is used to achieve efficient hierarchical storage and flexible allocation of hydrogen energy. Through the pressure level division and redundant hydrogen supply path design, it can simultaneously meet the rapid peak shaving response of the gas turbine and the demand for accommodating the volatility of renewable energy; The gas turbine power generation device is used to dynamically regulate the hydrogen blending ratio of natural gas to achieve hydrogen energy consumption and flexible power supply, and at the same time achieve flexible peak shaving through load regulation.

2. The hydrogen-doped gas turbine system using multi-stage hydrogen storage according to claim 1, characterized in that, The renewable energy power generation device includes a photovoltaic power generation unit and a wind power generation unit; the photovoltaic power generation unit and the wind power generation unit are respectively connected to the power grid through an AC bus. A part of the electric energy generated by the photovoltaic power generation unit and the wind power generation unit is input into the power grid through the AC bus, and the other part is input into the electrolytic hydrogen production device through the AC bus for electrolyzing water to produce hydrogen; Among them, the photovoltaic power generation unit includes a photovoltaic generator set, a photovoltaic transformer, and a DC / AC converter connected in sequence, and the wind power generation unit includes a wind turbine generator set and a wind power transformer connected in sequence.

3. A hydrogen-blended gas turbine system with multi-stage hydrogen storage according to claim 1, characterized in that, The electrolytic hydrogen production device includes a disconnector, a transformer 1, an AC / DC converter, an electrolytic cell, and a hydrogen purification device connected in sequence. The electrolytic hydrogen production device is connected to the multi-stage hydrogen storage and multi-path hydrogen supply device through the hydrogen purification device.

4. A hydrogen-doped gas turbine system using multi-stage hydrogen storage according to claim 1, characterized in that, The multi-stage hydrogen storage and multi-path hydrogen supply device includes an intelligent flow divider valve, a hydrogen compression unit, a low-pressure hydrogen storage tank, a medium-pressure hydrogen storage tank, a high-pressure hydrogen storage tank, and a hydrogen blending pre-mixer; wherein, the first pipeline for the intelligent flow divider valve to output hydrogen is sequentially provided with a hydrogen compression unit and a hydrogen blending pre-mixer; the hydrogen compression unit includes a hydrogen compressor 1, a hydrogen compressor 2, and a hydrogen compressor 3 arranged in sequence. A low-pressure hydrogen storage tank and a hydrogen flow control valve 1 are sequentially arranged between the hydrogen compressor 1 and the first pipeline. A medium-pressure hydrogen storage tank and a hydrogen flow control valve 2 are sequentially arranged between the hydrogen compressor 2 and the first pipeline. A high-pressure hydrogen storage tank and a hydrogen flow control valve 3 are sequentially arranged between the hydrogen compressor 3 and the first pipeline; A pressure grading valve 1 is arranged between the hydrogen compressor 1 and the hydrogen compressor 2, and a pressure grading valve 2 is arranged between the hydrogen compressor 2 and the hydrogen compressor 3; a grading pressure reducing valve group is arranged on the first pipeline; the intelligent flow divider valve is connected to the hydrogen blending pre-mixer through a second pipeline for outputting hydrogen, and a proportional regulating valve is arranged on the second pipeline; a natural gas flow control valve is arranged on the pipeline for inputting natural gas into the hydrogen blending pre-mixer.

5. A hydrogen-doped gas turbine system using multi-stage hydrogen storage according to claim 4, characterized in that, After the selection of pressure grading valve 1 and pressure grading valve 2, hydrogen is sent into high-pressure hydrogen storage tanks, medium-pressure hydrogen storage tanks and low-pressure hydrogen storage tanks for storage respectively according to the results of current optimal scheduling control: when it is predicted that the wind and solar power is sufficient, the high-pressure hydrogen storage tanks are preferentially filled with hydrogen; when it is predicted that there is a rapid peak shaving demand, the low-pressure hydrogen storage tanks are preferentially used to store hydrogen; when there is an emergency peak shaving demand, the hydrogen in the low-pressure hydrogen storage tanks is preferentially used. After the hydrogen in the low-pressure tanks is exhausted, the hydrogen in the medium-pressure tanks and high-pressure tanks is used in turn. The hydrogen flow is controlled by hydrogen flow control valve 1, hydrogen flow control valve 2 and hydrogen flow control valve 3 and passes through a group of series-connected grading pressure reducing valve groups to gradually reduce the hydrogen pressure to the fuel supply pressure of the gas turbine and send it into the hydrogen blending pre-mixer to be mixed with natural gas. The natural gas flow control valve controls the natural gas flow, and the fuel quantity sent into the combustion chamber and the hydrogen blending ratio of natural gas are jointly controlled by controlling the valve opening.

6. A hydrogen-doped gas turbine system using multi-stage hydrogen storage according to claim 1, characterized in that, The gas turbine power generation device includes a compressor, a combustion chamber, a turbine, a generator, and a transformer 2 arranged in sequence. The multi-stage hydrogen storage and multi-path hydrogen supply device is connected to the combustion chamber of the gas turbine power generation device through a hydrogen blending pre-mixer.

7. A control method for a hydrogen-blended gas turbine system with multi-stage hydrogen storage according to any one of claims 1-6, characterized in that, The regulation method includes: Situation 1: When the wind and solar energy is sufficient and there is still surplus after power generation meets the grid load: the gas turbine stops. At this time, the valve switch of the intelligent shunt valve leading to the hydrogen blending pre-mixer is closed, and the natural gas flow control valve is closed; the disconnector is opened, and the electrolyzer is started. The excess electric energy generated by wind and solar power generation is used to produce hydrogen by electrolyzing water. The hydrogen is successively converted into hydrogen storage through a hydrogen purification device and a gas compressor unit. The flow direction of hydrogen is optimized by current optimal scheduling control: when it is predicted that the wind and solar power is sufficient, the high-pressure hydrogen storage tanks are filled with hydrogen; when it is predicted that there is a rapid peak shaving demand, the low-pressure hydrogen storage tanks are used to store hydrogen; Situation 2: When the wind and solar energy is insufficient, that is, the electric power generated by wind and solar cannot meet the grid load demand: the valve switch of the intelligent shunt valve leading to the hydrogen blending pre-mixer and the natural gas flow control valve are opened to mix hydrogen and natural gas at a certain hydrogen blending ratio; according to the specific grid load demand, the fuel quantity added to the gas turbine is increased, and the power of the electrolyzer is gradually reduced until it is closed as the load increases. At this time, the disconnector is disconnected; at the same time, the hydrogen flow valve of the hydrogen storage tank is opened, and the hydrogen in the low-pressure hydrogen storage tank is preferentially used. After the hydrogen in the low-pressure hydrogen storage tank is exhausted, the hydrogen in the medium-pressure hydrogen storage tank and high-pressure hydrogen storage tank is used in turn. The hydrogen pressure is reduced to the working pressure of the combustion chamber through a grading pressure reducing valve group and then enters the hydrogen blending pre-mixer to be pre-mixed with natural gas in a certain proportion and then sent into the combustion chamber for combustion. The gas turbine power generation is used to meet the system peak shaving demand; Situation 3: When the grid load demand suddenly drops during the peak shaving process: first, the valve opening of the intelligent shunt valve leading to the hydrogen blending module and the valve opening of the natural gas flow control valve are reduced to reduce the fuel quantity entering the gas turbine and reduce the power generation power of the gas turbine; at the same time, the hydrogen production power of the electrolyzer is gradually increased; the hydrogen produced is sent into the hydrogen storage tank for storage; when the system meets the grid peak shaving demand, the gas turbine stops, and all hydrogen flow control valves and natural gas flow control valves are closed.

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