System and method for coupling wind-solar power generation, ammonia energy storage and supercritical hydrothermal combustion power generation

Abstract

According to the system, a hydrogen outlet of a water electrolysis hydrogen production unit is connected with an electrochemical synthesis ammonia energy storage unit, and a wind-solar power generation unit is connected with the water electrolysis hydrogen production unit and the electrochemical synthesis ammonia energy storage unit; the water electrolysis hydrogen production unit and the electrochemical synthesis ammonia energy storage unit are connected with a supercritical hydrothermal combustion steam generation device in the supercritical hydrothermal combustion power generation unit, and an ammonia water heating device is arranged on a pipeline from the electrochemical synthesis ammonia energy storage unit to the supercritical hydrothermal combustion steam generation device; a water inlet of the water electrolysis hydrogen production unit is connected with a water storage tank, the water storage tank is provided with two pipelines which are connected with a supercritical hydrothermal combustion steam generation device, and the supercritical hydrothermal combustion steam generation device is connected with a steam turbine; new energy power generation and supercritical hydrothermal combustion power generation are organically combined through a green ammonia energy storage technology, and the problems of intermittency and volatility of wind and light power generation are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of renewable energy power generation and energy storage, and particularly relates to a system and method for coupling wind-solar power generation, ammonia energy storage and supercritical hydrothermal combustion power generation. BACKGROUND

[0002] With the acceleration of the global energy structure transformation towards renewable energy, the large-scale grid connection of fluctuating power sources such as wind power and photovoltaic power has posed a serious challenge to the stability of the power system. As the core representatives of clean energy, wind and solar energy have the advantages of wide distribution, abundant resources and zero carbon emissions, and have become the backbone of energy to achieve the "double carbon" strategic goal. However, their inherent intermittency, randomness and uncontrollability lead to a serious mismatch between power supply and load demand in terms of time and space: a large amount of excess power is generated during periods of abundant wind and solar resources, while traditional energy sources are relied on during windless and weak light periods. This imbalance between supply and demand not only wastes clean energy, but also may affect the safe and stable operation of the power grid. In order to accommodate the intermittency of wind-solar power, hydrogen storage technology is an effective means of regulation. In addition to direct power generation, renewable energy such as wind and solar can be used to produce green hydrogen through water electrolysis, which can be stored and reused, reducing the instability of power grid connection, increasing the utilization time of renewable energy generation, fully utilizing abandoned wind and light, and improving the efficiency of wind-solar hydrogen production and wind-solar power generation.

[0003] Currently, hydrogen energy still has problems such as easy explosion, low safety, and difficulty in liquefaction. In the process of hydrogen energy industry development, hydrogen storage and transportation is still an important link restricting the development of hydrogen energy industry. Efficient and low-cost hydrogen storage and transportation technology is a necessary guarantee for large-scale hydrogen use. Ammonia is a hydrogen-rich carrier with a hydrogen content of 17.6%. The volumetric hydrogen storage density of liquid ammonia (121 kgH2 / m 3 ) is significantly higher than that of liquid hydrogen (71 kgH2 / m 3 ), and the storage and transportation conditions are mild (-33℃ or 1MPa can be liquefied). In addition, ammonia is gradually applied to the field of energy conversion due to its advantages of zero carbon emission, high calorific value, easy storage and transportation, and good explosion-proof characteristics, and is an excellent carrier for hydrogen storage. Liquid ammonia hydrogen storage technology refers to the reaction of hydrogen and nitrogen to generate ammonia as a hydrogen storage medium; when hydrogen is needed, it is decomposed into hydrogen for use. However, the intermediate process of this "hydrogen-ammonia-hydrogen" conversion process consumes energy, therefore, the most efficient way for ammonia to store and transport hydrogen energy is to use ammonia energy directly.

[0004] Traditional gas-phase ammonia combustion technology has low ammonia combustion rate, high ignition temperature (>650℃), and the need to add methane and other combustion-supporting agents, resulting in low efficiency of the gas-phase ammonia combustion system, and the presence of NO x and significant carbon emissions. Supercritical hydrothermal combustion technology has been gradually used in the field of energy conversion in recent years due to its high energy conversion characteristics at high temperature and high pressure. In supercritical water (T >374℃, P >22.1MPa) environment, fuels (such as alcohols, hydrogen, ammonia) and oxidants can burn quickly and homogeneously to form a hydrothermal flame, and the high-temperature and high-pressure working fluid produced can drive the generator set. In the high-pressure hydrothermal closed environment, carbon, nitrogen, and sulfur elements are directionally converted into CO2, N2 and sulfate, avoiding NO x 、SO x The generation path does not require denitrification / sulfurization or dust removal end-of-pipe purification equipment, making it significantly environmentally friendly. Furthermore, the combustion process of fuel in supercritical water is a wall-free heat transfer process, with direct heat transfer between molecules. The system thermal efficiency can reach over 90%, and the volume of the supercritical water thermal combustion device is only 1 / 4-1 / 5 of that of a traditional steam boiler, making it highly economical.

[0005] CN114024326A discloses a wind-solar-hydrogen coupled power generation and energy storage system and method that can be used for peak regulation. The system includes a new energy power generation system, a water electrolysis hydrogen production energy storage system, and a hydrogen, gas, and steam combined cycle power generation system. The system achieves maximum utilization of wind and solar resources under different power loads of the power grid through the complementarity of the energy supply and energy storage systems. CN118204025A discloses a green ammonia synthesis system and working method based on liquid ammonia mixture energy storage. The system includes a liquid ammonia mixture energy storage system, a renewable energy power generation system, a power grid, an air separation system, an alkaline water electrolysis system, and a synthetic ammonia system. The system stores excess electricity from renewable energy during low-peak electricity consumption periods through the liquid ammonia mixture energy storage system, and sells its stored electricity to the power grid along with renewable electricity input during peak electricity consumption periods. CN221217169U provides a renewable energy hydrogen production and ammonia synthesis system, including a renewable energy power generation system, an electrochemical energy storage system, a power grid system, a water electrolysis hydrogen production system, a hydrogen storage system, a nitrogen production system, and an ammonia synthesis system. The system fully utilizes the low cost of renewable energy power and adopts a combination of multiple power supply modes, such as off-grid power supply from renewable energy, electrochemical energy storage, and power grid power supply, to achieve low-cost hydrogen and ammonia production. The proposed renewable energy hydrogen production and ammonia synthesis system adopts a configuration method coupled with an electrochemical energy storage system and a hydrogen storage system, which can effectively absorb the fluctuating power of renewable energy and achieve stable joint operation with the ammonia synthesis system. None of the above involves coupling ammonia supercritical hydrothermal combustion. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a coupled wind-solar power generation, ammonia energy storage and supercritical hydrothermal combustion power generation system and method, which constructs a stable, safe and clean new energy power generation system by coupling wind-solar power generation, green ammonia energy storage and supercritical hydrothermal combustion steam generation technology.

[0007] In order to achieve the above-mentioned purpose, on the one hand, the application provides a coupling wind and light power generation, ammonia energy storage and supercritical water thermal combustion power generation system, comprising a wind and light power generation unit, a water electrolysis ammonia production unit, an electrochemical synthesis ammonia energy storage unit and a supercritical water thermal combustion power generation unit, the hydrogen outlet of the water electrolysis ammonia production unit is connected to the electrochemical synthesis ammonia energy storage unit, the power output end of the wind and light power generation unit is connected to the electric energy input end of the water electrolysis ammonia production unit and the electrochemical synthesis ammonia energy storage unit; the supercritical water thermal combustion power generation unit is provided with a supercritical water thermal combustion steam generating device, and a steam turbine and a generator connected coaxially, the product outlet of the water electrolysis ammonia production unit and the electrochemical synthesis ammonia energy storage unit is connected to the supercritical water thermal combustion steam generating device, and an ammonia water heating device is arranged on the pipeline from the electrochemical synthesis ammonia energy storage unit to the supercritical water thermal combustion steam generating device; the water inlet of the water electrolysis ammonia production unit is connected to a water storage tank, and the water storage tank is provided with two pipelines connected to the supercritical water thermal combustion steam generating device, one of which is connected to the supercritical water thermal combustion steam generating device through the ammonia water heating device, and the supercritical water thermal combustion steam generating device is connected to the steam turbine.

[0008] Further, the ammonia water heating device comprises an ammonia water preheater and an electric heater connected in sequence along the medium flow direction, and the outlet of the electric heater is connected to the supercritical water thermal combustion steam generating device; the electric heater is provided with a bypass pipeline, a valve is arranged on the bypass pipeline, and the power output end of the wind and light power generation unit is connected to the electric energy input end of the electric heater.

[0009] Further, the condensate outlet of the steam turbine is connected to the hot side of the hydrogen preheater, the hot side of the oxygen preheater and the water storage tank in sequence.

[0010] Further, the steam extraction port of the steam turbine is connected to the hot side inlet of the ammonia water preheater, and the hot side outlet of the ammonia water preheater is connected to the water storage tank through a back pressure valve.

[0011] Further, a bypass pipeline is arranged between the inlet and the steam extraction port of the steam turbine, and a valve is arranged on the bypass pipeline.

[0012] Further, the supercritical water thermal combustion steam generating device is provided with an ammonia water inlet, an oxygen inlet and a hydrogen inlet at the top, an ammonia water ring groove, a hydrogen groove, an oxygen ring groove and a combustion chamber in the supercritical water thermal combustion steam generating device, the ammonia water inlet is communicated with the ammonia water ring groove, the hydrogen inlet is communicated with the hydrogen groove, and the oxygen inlet is communicated with the oxygen ring groove, the ammonia water ring groove, the hydrogen groove and the oxygen ring groove are all communicated with the combustion chamber through inclined channels, the inclined channels on the oxygen ring groove of the ammonia water ring groove all face the central axis direction of the combustion chamber, and the inclined channels of the hydrogen groove face away from the central axis direction of the combustion chamber; the side wall of the oxygen ring groove is provided with an inclined channel facing the inner wall of the combustion chamber.

[0013] Further, the electrolytic water production unit is provided with a hydrogen buffer tank and an oxygen cooler, the electrochemical ammonia synthesis energy storage unit is provided with a PSA air separation device and an electrochemical ammonia synthesis reactor, the hydrogen buffer tank is connected to the anode inlet of the electrochemical ammonia synthesis reactor, the nitrogen outlet of the PSA air separation device is connected to the cathode inlet of the electrochemical ammonia synthesis reactor, the PSA air separation device is also connected to the oxygen cooler, a PSA oxygen compressor is arranged on the pipeline from the PSA air separation device to the oxygen cooler, and the power output end of the wind-solar power generation unit is connected to the power input end of the electrochemical ammonia synthesis reactor.

[0014] Further, the cathode outlet of the electrochemical ammonia synthesis reactor is sequentially connected to a liquefaction separation device, an ammonia purifier and an ammonia water storage tank, the ammonia water storage tank is connected to the supercritical water thermal combustion steam generation device through an ammonia water heating device; the nitrogen outlet of the liquefaction separation device is connected to the cathode inlet of the electrochemical ammonia synthesis reactor, and the hydrogen outlet of the liquefaction separation device is connected to the anode inlet of the electrochemical ammonia synthesis reactor.

[0015] On the other hand, the application provides a wind-solar power generation, ammonia energy storage and supercritical water thermal combustion power generation method, which comprises: when the wind-solar resource is in excess, the wind-solar power generation unit provides power to the electrolytic water production unit and the electrochemical ammonia synthesis energy storage unit, and the power of the wind-solar power generation unit is stored in the form of products of the electrolytic water production unit and the electrochemical ammonia synthesis energy storage unit; The electrolytic water production unit produces hydrogen and oxygen, part of the hydrogen enters the electrochemical ammonia synthesis energy storage unit to participate in the synthesis of liquid ammonia during the power peak period; the water in the water storage tank is heated by the ammonia water heating device and then enters the supercritical water thermal combustion steam generation device to charge, heat and pressurize the supercritical water thermal combustion steam generation device; The oxygen, another part of the hydrogen and the ammonia water heated by the ammonia water heating device enter the supercritical water thermal combustion steam generation device to participate in combustion; the high-temperature mixed fluid generated by ammonia-hydrogen supercritical water thermal combustion is mixed with low-temperature mixed water to obtain mixed water vapor that can be used for steam turbine power generation, and the mixed water vapor is expanded to do work in the steam turbine to drive the rotation of the steam turbine, and the steam turbine drives the generator to generate electricity.

[0016] Further, the water charging and pressure raising for the supercritical water thermal combustion steam generation device comprises: opening the steam turbine bypass pipeline, starting the water flow from the outlet of the supercritical water thermal combustion steam generation device into the hot side of the ammonia water preheater and the back pressure valve, preheating the cold water in the ammonia water preheater, and maintaining and controlling the pressure of the equipment and pipelines in the supercritical water thermal combustion power generation unit through the back pressure valve; the preheated water is heated by the electric heater and then delivered to the supercritical water thermal combustion steam generation device until the pressure of the supercritical water thermal combustion steam generation device reaches 25 MPa and the temperature of the fluid at the outlet of the supercritical water thermal combustion steam generation device reaches 450℃. The oxygen, another part of hydrogen and the ammonia water heated by the ammonia water heating device enter the supercritical water thermal combustion steam generating device to participate in combustion including: The supercritical water thermal combustion steam generating device is used for starting and maintaining stable combustion of the supercritical water thermal combustion steam generating device; when the supercritical water thermal combustion steam generating device is started, the 25MPa hydrogen gas and the ammonia water enter the supercritical water thermal combustion steam generating device after being heated, the 25MPa oxygen enters the supercritical water thermal combustion steam generating device after being heated, the hydrogen gas, the ammonia water and the oxygen jet collide, the supercritical water thermal combustion is started, and the supercritical water thermal combustion flame is formed; the high-pressure mixed water is delivered to the supercritical water thermal combustion steam generating device, the high-temperature mixed fluid generated by combustion is mixed with the low-temperature mixed water, 25MPa and 600℃ mixed water vapor is obtained, the bypass of the steam turbine is disconnected, the mixed water vapor enters the steam turbine to expand and do work, and the mixed water vapor becomes 1.6MPa and 200℃ condensed water after expanding and doing work in the steam turbine, and the condensed water is discharged from the condensed water outlet of the steam turbine and used for preheating of the hydrogen and the oxygen; When the supercritical water thermal combustion steam generating device is in stable combustion, the bypass pipeline connected with the electric heater is used to draw out 8.1MPa and 400℃ intermediate extraction steam from the middle of the steam turbine, the intermediate extraction steam enters the hot fluid side of the ammonia water preheater, the ammonia water enters the supercritical water thermal combustion steam generating device after being cooled by the cold side of the ammonia water preheater, participates in the supercritical water thermal combustion reaction and maintains stable supercritical water thermal combustion flame, and the intermediate extraction steam is cooled in the ammonia water preheater, flows through the back pressure valve to reduce the pressure to the atmospheric pressure and enters the water storage tank; The ammonia water, the hydrogen and the oxygen flowing into the supercritical water thermal combustion steam generating device are adjusted, and the power generation capacity of the supercritical water thermal combustion power generation unit is controlled.

[0017] Compared with the prior art, the present application has at least the following beneficial effects: 1) The clean fuel ammonia is used as an energy storage carrier, and the high safety and easy storage and transportation characteristics are utilized; the whole process of synthesis and utilization of the intermediate medium ammonia is free of CO2 and NO x emissions, and zero pollution and zero carbon emissions of the system are realized.

[0018] 2) The supercritical water steam is generated by supercritical water thermal combustion of ammonia to drive power generation, the technology has the advantages of low ignition energy consumption, high system thermal efficiency and compact device structure compared with traditional gas phase ammonia combustion, and the economic benefit is remarkable.

[0019] 3) The system combines new energy power generation and supercritical water thermal combustion power generation through green ammonia energy storage technology, effectively solves the intermittency and volatility problems of wind and light power generation, and constructs a stable, safe and clean new energy power generation system. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of a coupling wind and light power generation, ammonia energy storage and supercritical water thermal combustion power generation system of the present application.

[0021] Figure 2 Is the supercritical hydrothermal combustion steam generation device top cover structure diagram.

[0022] In the figure: 1, lye tank, 2, lye pump, 3, alkaline electrolytic cell, 4, oxygen separator, 5, hydrogen separator, 6, oxygen acid washing tower, 7, hydrogen acid washing tower, 8, oxygen buffer tank, 9, hydrogen buffer tank, 10, oxygen storage compressor, 11, hydrogen storage compressor, 12, oxygen cooler, 13, hydrogen cooler, 14, oxygen storage tank, 15, hydrogen storage tank, 16, high pressure oxygen compressor, 17, high pressure hydrogen compressor, 18, oxygen preheater, 19, hydrogen preheater, 20, PSA air separation device, 21, PSA oxygen compressor, 22, first three-way valve, 23, second three-way valve, 24, third three-way valve, 25, electrochemical synthesis ammonia reactor, 26, liquefied separation device, 27, ammonia purifier, 28, ammonia water storage tank, 29, low pressure mixed water pump, 30, back pressure valve, 31, high pressure mixed water pump, 32, water storage tank, 33, electrolytic cell water supply pump, 34, water supply desalination treatment system, 35, high pressure ammonia water pump, 36, ammonia water preheater, 37, electric heater, 38, electric heater bypass valve, 39, supercritical hydrothermal combustion steam generation device, 40, first electric stop valve, 41, second electric stop valve, 42, steam turbine, 43, steam turbine bypass valve, 44, generator, 45, combustion power generation unit transformer, 46, wind and light power generation system, 47, wind and light power generation unit transformer, 48, power grid system, 49, first outlet valve, 50, second outlet valve, 51, third outlet valve, 52, fourth outlet valve, 53, fifth outlet valve, 54, sixth outlet valve, 55, seventh outlet valve, 56, eighth outlet valve, 57, ninth outlet valve, 58, first regulating valve, 59, second regulating valve, 60, third regulating valve, 61, fourth regulating valve, 62, fifth regulating valve, 63, sixth regulating valve, 64, first thermocouple, 65, second thermocouple, 66, pressure gauge.

[0023] 321, steam turbine condensate water backwater inlet, 322, electrolytic cell water supply outlet, 323, ammonia solution preparation water outlet, 324, starting water outlet, 325, steam turbine extraction steam backwater inlet, 326, high pressure mixed water outlet.

[0024] 391, ammonia water inlet, 392, hydrogen inlet, 393, oxygen inlet, 394, ammonia water ring tank, 395, hydrogen tank, 396, oxygen ring tank. DETAILED DESCRIPTION

[0025] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application.

[0026] The present application proposes a closed-loop system of "wind-solar power generation → green ammonia energy storage → supercritical water thermal combustion power generation". In the wind-solar power curtailment period, the surplus power is used for water electrolysis to produce hydrogen and electrochemical synthesis of green ammonia, which is stored in the form of ammonia water; in the power demand period, the supercritical water thermal combustion unit directly burns ammonia water to generate supercritical water vapor for power generation, which compensates for the power grid or user power demand. The wind-solar power generation, green ammonia energy storage and supercritical water thermal combustion power generation system proposed by the present application has the following advantages: 1) Using clean fuel ammonia as an energy storage carrier, taking advantage of its high safety and easy storage and transportation characteristics; the whole process of synthesis and utilization of intermediate medium ammonia has no CO2 and NOx emissions, realizing zero pollution and zero carbon emission of the system. x

[0027] 2) The supercritical water vapor generated by the supercritical water thermal combustion of ammonia is used to drive power generation. This technology has the advantages of low ignition energy consumption, high system thermal efficiency and compact device structure compared with traditional gas-phase ammonia combustion, and its economic benefit is remarkable.

[0028] 3) The system combines new energy power generation and supercritical water thermal combustion power generation through green ammonia energy storage technology, effectively solves the intermittency and volatility problem of wind-solar power generation, and builds a stable, safe and clean new energy power generation system.

[0029] The present application provides a coupling wind-solar power generation, ammonia energy storage and supercritical water thermal combustion power generation system, such as Figure 1 ​As shown, including wind and light power generation unit, system water allocation unit, electrolytic water ammonia unit, electrochemical synthesis ammonia energy storage unit, supercritical water heat combustion power generation unit and power grid system; the power output end of the wind and light power generation unit and the power output end of the supercritical water heat combustion power generation unit are connected to the power grid. The electrolytic water ammonia unit includes a lye tank 1, the outlet of the lye tank 1 is communicated with a lye pump 2, the lye pump 2 is communicated with an alkaline electrolytic cell 3, the anode outlet of the alkaline electrolytic cell 3 is communicated with an oxygen separator 4, the cathode outlet of the alkaline electrolytic cell 3 is communicated with a hydrogen separator 5, the lye flow outlets of the oxygen separator 4 and the hydrogen separator 5 are connected to the recovery port of the lye tank 1, the outlet of the oxygen separator 4 is sequentially communicated with an oxygen acid washing tower 6, an oxygen buffer tank 8 and a storage oxygen compressor 10, the hydrogen separator 5 is sequentially communicated with a hydrogen acid washing tower 7, a hydrogen buffer tank 9 and a storage hydrogen compressor 11, the outlet of the storage oxygen compressor 10 is communicated with the first inlet of a first three-way valve 22, the outlet of the first three-way valve 22 is sequentially communicated with an oxygen cooler 12 and an oxygen storage tank 14, the outlet of the storage hydrogen compressor 11 is sequentially communicated with a hydrogen cooler 13 and a hydrogen storage tank 15.

[0030] Reference Figure 2 The supercritical water heat combustion steam generation device 39 is provided with an ammonia water inlet 391, an oxygen inlet 393 and a hydrogen inlet 392 at the top, an ammonia water ring groove 394, a hydrogen groove 395, an oxygen ring groove 396 and a combustion chamber, the ammonia water inlet 391 is communicated with the ammonia water ring groove 394, the hydrogen inlet 392 is communicated with the hydrogen groove 395, the oxygen inlet 393 is communicated with the oxygen ring groove 396, the ammonia water ring groove 394, the hydrogen groove 395 and the oxygen ring groove 396 are all communicated with the combustion chamber through inclined channels, the inclined channels on the oxygen ring groove 396 of the ammonia water ring groove 394 all face the central axis direction of the combustion chamber, the inclined channels of the hydrogen groove 395 face away from the central axis direction of the combustion chamber; the side wall of the oxygen ring groove 396 is provided with inclined channels facing the inner wall of the combustion chamber.

[0031] The electrochemical ammonia synthesis energy storage unit comprises a PSA air separation device 20, the oxygen outlet of the PSA air separation device 20 is connected to a third outlet valve 51, the third outlet valve 51 is connected to the inlet of a PSA oxygen compressor 21, the outlet of the PSA oxygen compressor 21 is connected to the second inlet of a first three-way valve 22, the nitrogen outlet of the PSA air separation device 20 is connected to a fourth outlet valve 52, the fourth outlet valve 52 is connected to the first inlet of a second three-way valve 23, the outlet of the second three-way valve 23 is connected to the cathode inlet of an electrochemical ammonia synthesis reactor 25, the anode inlet of the electrochemical ammonia synthesis reactor 25 is connected to the outlet of a third three-way valve 24, the first inlet of the third three-way valve 24 is connected to a fifth outlet valve 53, the fifth outlet valve 53 is connected to a hydrogen buffer tank 9, the cathode outlet of the electrochemical ammonia synthesis reactor 25 is connected to the inlet of a liquefied separation device 26, the nitrogen outlet of the liquefied separation device 26 is connected to the second inlet of the second three-way valve 23, the hydrogen outlet of the liquefied separation device 26 is connected to the second inlet of the third three-way valve 24, the ammonia outlet of the liquefied separation device 26 is connected to an ammonia purifier 27, the ammonia purifier 27 is connected to a sixth outlet valve 54 and an ammonia water storage tank 28 in sequence.

[0032] The supercritical hydrothermal combustion power generation unit comprises a first outlet valve 49, the inlet and outlet of which are connected to the oxygen storage tank 14 and a first regulating valve 58, respectively, the first regulating valve 58 being connected in turn to the high-pressure oxygen compressor 16 and the cold fluid inlet of the oxygen preheater 18, the cold fluid outlet of the oxygen preheater 18 being connected to the oxygen inlet 393 of the supercritical hydrothermal combustion steam generator 39. The inlet and outlet of a second outlet valve 50 are connected to the hydrogen storage tank 15 and a second regulating valve 59, respectively, the second regulating valve 59 being connected in turn to the high-pressure hydrogen compressor 17 and the cold fluid inlet of the hydrogen preheater 19, the cold fluid outlet of the hydrogen preheater 19 being connected to the hydrogen inlet 392 of the supercritical hydrothermal combustion steam generator 39. The inlet and outlet of a seventh outlet valve 55 are connected to the ammonia water storage tank 28 and a fourth regulating valve 61, respectively, the fourth regulating valve 61 being connected to the inlet of the high-pressure ammonia water pump 35, the outlet of which is connected to the cold fluid inlet of the ammonia water preheater 36, the cold fluid outlet of the ammonia water preheater 36 being connected to the electric heater 37, the inlet and outlet of which are connected to the inlet and outlet, respectively, of the electric heater bypass valve 38, the electric heater 37 being connected to the first thermocouple 64, the first thermocouple 64 being connected to the ammonia water inlet 391 of the supercritical hydrothermal combustion steam generator 39, a pressure gauge 66 being inserted into the supercritical hydrothermal combustion steam generator 39, the outlet of which is connected to the second thermocouple 65, the second thermocouple 65 being connected to the first electric shut-off valve 40, the first electric shut-off valve being connected to the steam inlet of the steam turbine 42, the steam inlet and the intermediate extraction outlet of the steam turbine 42 being connected to the inlet and outlet, respectively, of the steam turbine bypass valve 43, the condensate outlet of the steam turbine 42 being connected to the second electric shut-off valve 41, the shaft of the steam turbine 42 being connected to the rotor of the electric generator 44, the output line of the electric generator 44 being connected to the low-voltage side of the combustion power generation unit transformer 45, the high-voltage side of the combustion power generation unit transformer 45 being connected to the power grid system 48.

[0033] The system water distribution unit comprises a water storage tank 32, and the interfaces on the water storage tank 32 comprise a steam turbine condensate water return inlet 321, an electrolytic cell makeup water outlet 322, an ammonia solution preparation water outlet 323, a start-up water outlet 324, a steam turbine extraction steam return inlet 325, and a high-pressure mixed water outlet 326. The electrolytic cell makeup water outlet 322 is connected to an electrolytic cell makeup water pump 33, the electrolytic cell makeup water pump 33 is connected to a makeup water desalination treatment system 34, the makeup water desalination treatment system 34 is connected to the alkaline electrolytic cell 3; the ammonia solution preparation water outlet 323 is sequentially connected to a low-pressure mixed water pump 29 and an ammonia water storage tank 28; the start-up water outlet 324 is sequentially connected to an eighth outlet valve 56 and a fifth regulating valve 62, the outlet of the fifth regulating valve 62 is connected to the inlet of a high-pressure ammonia water pump 35; the steam turbine extraction steam return inlet 325 is connected to a back pressure valve 30, the back pressure valve 30 is connected to the hot fluid outlet of an ammonia water preheater 36, the hot fluid inlet of the ammonia water preheater 36 is connected to a third regulating valve 60, the third regulating valve 60 is connected to the intermediate extraction steam outlet of the steam turbine 42; the high-pressure mixed water outlet 326 is sequentially connected to a ninth outlet valve 57 and a sixth regulating valve 63, a high-pressure mixed water pump 31, and the cold and hot fluid mixing port at the bottom of the supercritical water heat combustion steam generation device 39; the steam turbine condensate water return inlet 321 is connected to the hot fluid outlet of the oxygen preheater 18, the hot fluid inlet of the oxygen preheater 18 is connected to the hot fluid outlet of the hydrogen preheater 19, and the hot fluid inlet of the hydrogen preheater 19 is connected to the condensate water outlet of the steam turbine 42.

[0034] The wind-solar power generation unit comprises a wind-solar power generation system 46, and the output lines of the wind-solar power generation unit are respectively connected to the alkaline electrolytic cell 3, the PSA air separation device 20, the electrochemical synthetic ammonia reactor 25, and the electric heater 37; the wind-solar power generation system 46 is connected to the low-voltage side of a wind-solar power generation unit transformer 47, and the high-voltage side of the wind-solar power generation unit transformer 47 is connected to the power grid system 48.

[0035] The fuel of the supercritical hydrothermal combustion steam generator 39 is a mixture of ammonia water and hydrogen. High-pressure ammonia water enters the ammonia water ring groove 394 from the ammonia water inlet 391, and the bottom surface of the ammonia water ring groove 394 is provided with an oblique injection hole. The high-pressure ammonia water is injected into the combustion chamber of the supercritical hydrothermal combustion steam generator 39 from the oblique injection hole to form a high-pressure ammonia water jet. High-pressure hydrogen gas enters the hydrogen gas groove 395 from the hydrogen gas inlet 392, and the bottom surface of the hydrogen gas groove 395 is provided with an oblique injection hole. The high-pressure hydrogen gas is injected into the combustion chamber of the supercritical hydrothermal combustion steam generator 39 from the oblique injection hole to form a high-pressure hydrogen gas jet. The high-pressure ammonia water jet and the high-pressure hydrogen gas jet first collide and mix in the combustion chamber of the supercritical hydrothermal combustion steam generator 39 to form an ammonia-hydrogen mixed jet. High-pressure oxygen gas enters the oxygen ring groove 396 from the oxygen gas inlet 393, and the bottom surface and the side surface of the oxygen ring groove are provided with oblique injection holes. The first oxygen gas is injected into the supercritical hydrothermal combustion steam generator 39 from the side oblique injection hole and flows into the combustion chamber to form a wall cooling protective gas film. The second oxygen gas is injected into the combustion chamber of the supercritical hydrothermal combustion steam generator 39 from the bottom oblique injection hole to form a high-pressure oxygen gas jet. The ammonia-hydrogen mixed jet and the high-pressure oxygen gas jet collide and mix in the combustion chamber of the supercritical hydrothermal combustion steam generator 39 to form a hydrothermal flame.

[0036] The supercritical hydrothermal combustion process in the supercritical hydrothermal combustion steam generator 39 produces a mixture of supercritical water vapor and nitrogen, which enters the steam turbine 42 to expand and do work, driving the generator 44 to generate electricity.

[0037] The electricity generated by the wind-solar power generation system 46 is transmitted to the low-voltage side of the wind-solar power generation unit transformer 47, and after being boosted by the wind-solar power generation unit transformer 47, it is connected to the power grid system 48.

[0038] The power output end of the wind-solar power generation system 46 is connected to the power input end of the alkaline electrolysis tank 3, the electrochemical ammonia synthesis reactor 25, and the PSA air separation device 20. When the wind-solar power generation power exceeds the power grid consumption threshold, the wind-solar power generation system 46 not only transmits the required power generation to the power grid system 48, but also uses the remaining power generation to power the alkaline electrolysis tank 3, the electrochemical ammonia synthesis reactor 25, and the PSA air separation device 20.

[0039] First, the wind and light power generation system 46 supplies power to the alkaline electrolyzer 3. The caustic soda pump 2 is started to deliver the KOH aqueous solution from the caustic soda tank 1 to the alkaline electrolyzer 3; at the same time, the electrolyzer water replenishing pump 33 is started to replenish water from the electrolyzer water replenishing outlet 322 of the water storage tank 32 to the alkaline electrolyzer 3, and the replenished water is first subjected to desalination treatment in the water replenishing desalination treatment system 34 and then enters the alkaline electrolyzer 3. The anode and cathode of the alkaline electrolyzer 3 generate oxygen and hydrogen, respectively, and the oxygen and hydrogen enter the oxygen separator 4 and the hydrogen separator 5, respectively. In the oxygen separator 4, the oxygen is separated from the KOH aqueous solution, and the KOH aqueous solution is recovered to the caustic soda tank 1, and the oxygen enters the oxygen acid washing tower 6 to further remove KOH in the oxygen stream. In the hydrogen separator 5, the hydrogen is separated from the KOH aqueous solution, and the KOH aqueous solution is recovered to the caustic soda tank 1, and the hydrogen enters the hydrogen acid washing tower 7 to further remove KOH in the hydrogen stream. The purified oxygen from the oxygen acid washing tower 6 enters the oxygen buffer tank 8, and when the pressure in the oxygen buffer tank 8 reaches 0.5 MPa, the storage oxygen compressor 10 is started to compress the oxygen to 20 MPa and enter the first inlet of the first three-way valve 22, flow from the outlet of the first three-way valve 22 into the oxygen cooler 12, and be cooled to 25°C in the oxygen cooler 12, and then enter the oxygen storage tank 14 for storage. The purified hydrogen from the hydrogen acid washing tower 7 enters the hydrogen buffer tank 9, and when the pressure in the hydrogen buffer tank 9 reaches 0.5 MPa, the fifth outlet valve 53 is opened, and the hydrogen enters the first inlet of the third three-way valve 24, flows from the outlet of the third three-way valve 24 into the anode inlet of the electrochemical ammonia synthesis reactor 25; the remaining hydrogen in the hydrogen buffer tank 9 flows into the storage hydrogen compressor 11, and the storage hydrogen compressor 11 is started to compress the hydrogen to 20 MPa, and then flow into the hydrogen cooler 13, and be cooled to 25°C in the hydrogen cooler 13, and then enter the hydrogen storage tank 15 for storage; the hydrogen buffer tank 9 is also connected to the anode inlet of the electrochemical ammonia synthesis reactor 25.

[0040] The wind-solar power generation system 46 supplies power to the PSA air separation unit 20 and the electrochemical ammonia synthesis reactor 25. The oxygen produced by the PSA air separation unit 20 enters the PSA oxygen compressor 21 through the third outlet valve 51, and after being compressed to 20 MPa, flows into the second inlet of the first three-way valve 22. In the first three-way valve 22, the oxygen delivered by the PSA oxygen compressor 21 is mixed with the oxygen produced by the water electrolysis ammonia production unit, and finally enters the oxygen storage tank 14 for storage. The nitrogen produced by the PSA air separation unit 20 flows into the first inlet of the second three-way valve 23 through the fourth outlet valve 52, and from the outlet of the second three-way valve 23 into the cathode inlet of the electrochemical ammonia synthesis reactor 25. The hydrogen entering from the anode inlet of the electrochemical ammonia synthesis reactor 25 and the nitrogen entering from the cathode inlet undergo an electrochemical reaction, and the ammonia produced in the cathode flows from the cathode outlet into the liquefaction separation unit 26. In the liquefaction separation unit 26, the ammonia gas containing hydrogen and nitrogen impurities is liquefied, and based on the difference in liquefaction temperature of ammonia, hydrogen and nitrogen, ammonia is separated from hydrogen and nitrogen impurities. After the hydrogen and nitrogen impurities flow out of the liquefaction separation unit 26, they are recycled to the second inlet of the third three-way valve 24 and the second inlet of the second three-way valve 23, respectively. After the liquefied ammonia flows out of the liquefaction separation unit 26, it enters the ammonia purifier 27, where further impurities are removed from the ammonia. The sixth outlet valve 54 is opened, and the purified liquefied ammonia enters the ammonia water storage tank 28, where it is mixed with softened water delivered by the low-pressure blending water pump 29 to form 28% ammonia water and is stored.

[0041] When the wind-solar power generation power is lower than the grid demand threshold, all the power generated by the wind-solar power generation system 46 is delivered to the grid system 48, and the insufficient part is compensated by the supercritical water thermal combustion power generation unit.

[0042] The supercritical water thermal combustion power generation unit is implemented in the following manner from start-up to normal operation: 1) The supercritical water thermal combustion power generation unit is boosted and heated.

[0043] Open the eighth outlet valve 56 and the fifth regulating valve 62, and start the high-pressure ammonia pump 35. The high-pressure ammonia pump 35 delivers the starting water from the water tank 32 to the supercritical hydrothermal combustion power generation unit. The starting water flow rate is controlled by the opening of the fifth regulating valve 62. Close the electric heater bypass valve 38. The starting water flows through the cold fluid side of the ammonia preheater 36 and the electric heater 37 in sequence, then enters the supercritical hydrothermal combustion steam generator 39 through the ammonia inlet 391 to fill the hydrothermal combustion unit. Open the turbine bypass valve 43 and the third regulating valve 60, and close the second electric stop valve 41. The starting water flows out of the outlet of the supercritical hydrothermal combustion steam generator 39, then flows through the first electric stop valve 40, the turbine bypass valve 43, the third regulating valve 60, and the hot fluid side of the ammonia preheater 36, before flowing into the backpressure valve 30. Back-pressure valve 30 maintains and controls the pressure in the equipment and pipelines within the supercritical hydrothermal combustion power generation unit. After the startup water flows out of back-pressure valve 30, it enters the water storage tank 32 through the turbine extraction return water inlet 325. As the startup water fills the supercritical hydrothermal combustion power generation unit, the pressure in the equipment and pipelines gradually rises until the pressure within the supercritical hydrothermal combustion steam generating unit 39 reaches 25 MPa. Pressure gauge 66 monitors the pressure within the hydrothermal combustion unit, and the supercritical hydrothermal combustion power generation unit is fully pressurized.

[0044] Start the electric heater 37. The starting water is heated to 450°C when flowing through the electric heater 37. The first thermocouple 64 is used to monitor the fluid temperature at the outlet of the electric heater 37. The heated starting water enters the supercritical hydrothermal combustion steam generator 39 to preheat the fluid in the hydrothermal combustion device and the device body until the fluid temperature at the outlet of the supercritical hydrothermal combustion steam generator 39 reaches 450°C. The second thermocouple 65 is used to monitor the fluid temperature at the outlet of the supercritical hydrothermal combustion steam generator 39. The supercritical hydrothermal combustion power generation unit is heated.

[0045] 2) Ignition of hydrothermal flame in supercritical hydrothermal combustion steam generator The seventh outlet valve 55 and the fourth regulating valve 61 are opened, the eighth outlet valve 56 and the fifth regulating valve 62 are closed, the high-pressure ammonia water pump 35 pressurizes the 28% ammonia water solution in the ammonia water storage tank 28 to 25 MPa and delivers it into the supercritical hydrothermal combustion power generation unit, and the ammonia water flow is controlled by the opening degree of the fourth regulating valve 61. The 28% ammonia water flows through the cold fluid side of the ammonia water preheater 36 and the electric heater 37 in turn, and after being heated by the electric heater 37 to 450℃, it enters the ammonia water ring groove 394 of the supercritical hydrothermal combustion steam generator 39 from the ammonia water inlet 391. The second outlet valve 50 and the second regulating valve 59 are opened, the high-pressure hydrogen gas compressor 17 is started, the high-pressure hydrogen gas compressor 17 pressurizes the hydrogen gas in the hydrogen gas storage tank 15 to 25 MPa and delivers it into the supercritical hydrothermal combustion power generation unit, and the hydrogen gas flow is controlled by the opening degree of the second regulating valve 59. The 25 MPa hydrogen gas flows through the cold fluid side of the hydrogen gas preheater 19 and is heated to 180℃, and then enters the hydrogen gas groove 395 of the supercritical hydrothermal combustion steam generator 39 from the hydrogen gas inlet 392. The high-pressure ammonia water is sprayed into the combustion chamber of the supercritical hydrothermal combustion steam generator 39 from the oblique injection hole at the bottom of the ammonia water ring groove 394, forming a high-pressure ammonia water jet; the high-pressure hydrogen gas is sprayed into the combustion chamber of the supercritical hydrothermal combustion steam generator 39 from the oblique injection hole at the bottom of the hydrogen gas groove 395, forming a high-pressure hydrogen gas jet; the high-pressure ammonia water jet and the high-pressure hydrogen gas jet collide and mix in the combustion chamber of the supercritical hydrothermal combustion steam generator 39, forming an ammonia-hydrogen mixed jet, and in the mixed jet, the molar ratio of ammonia to hydrogen is 9:1. The first outlet valve 49 and the first regulating valve 58 are opened, the high-pressure oxygen gas compressor 16 is started, the high-pressure oxygen gas compressor 16 pressurizes the oxygen gas in the oxygen gas storage tank 14 to 25 MPa and delivers it into the supercritical hydrothermal combustion power generation unit, and the oxygen gas flow is controlled by the opening degree of the first regulating valve 58, so that the ratio of oxygen gas to ammonia-hydrogen mixture entering the supercritical hydrothermal combustion power generation unit satisfies the oxidation coefficient 1.1 of the combustion reaction. The 25 MPa oxygen gas flows through the cold fluid side of the oxygen gas preheater 18 and is heated to 160℃, and then enters the oxygen gas ring groove 396 of the supercritical hydrothermal combustion steam generator 39 from the oxygen gas inlet 393. The high-pressure oxygen gas is sprayed into the combustion chamber of the supercritical hydrothermal combustion steam generator 39 from the oblique injection hole at the bottom of the oxygen gas ring groove and the oblique injection hole at the side of the oxygen gas ring groove respectively, the first stock of oxygen gas entering from the oblique injection hole at the side of the oxygen gas ring groove flows into the combustion chamber and forms a wall cooling protection gas film, and the second stock of oxygen gas entering from the oblique injection hole at the bottom of the oxygen gas ring groove forms a high-pressure oxygen gas jet. The ammonia-hydrogen mixed jet and the high-pressure oxygen gas jet collide and mix in the combustion chamber of the supercritical hydrothermal combustion steam generator 39. The critical preheating temperature of the supercritical hydrothermal combustion ignition of the ammonia-hydrogen mixture is 420℃, therefore the ammonia water solution preheated to 450℃ is injected into the supercritical hydrothermal combustion steam generator 39, and after colliding and mixing with the hydrogen gas jet and the oxygen gas jet in turn, it can ensure the supercritical hydrothermal combustion ignition and form a hydrothermal flame.The heat released by the supercritical hydrothermal combustion of ammonia-hydrogen can heat the fluid in the combustion device to about 1000°C.

[0046] Open the ninth outlet valve 57 and the sixth regulating valve 63, start the high-pressure mixed water pump 31, and control the flow rate of the high-pressure mixed water by adjusting the opening of the sixth regulating valve 63. The high-pressure mixed water pump 31 pressurizes the 25°C mixed water to 25 MPa and then delivers it to the cold and hot fluid mixing port at the bottom of the supercritical hydrothermal combustion steam generator 39. This allows the high-temperature mixed fluid produced by combustion to mix with the low-temperature mixed water, producing mixed steam at 25 MPa and 600°C. Close the turbine bypass valve 43, close the third regulating valve 60, and open the second electric shut-off valve 41. After entering the steam turbine 42, the mixed steam expands and generates work, driving the blades of the steam turbine 42. The shaft of the steam turbine 42 rotates, driving the rotor of the generator 44 to generate electricity. The electricity generated by the generator 44 is boosted by the combustion power generation unit transformer 45 and then fed into the power grid system 48 to compensate for the power generated by the wind and solar power generation units.

[0047] The 25 MPa, 600°C mixed steam expands and produces work in the steam turbine 42, becoming 1.6 MPa, 200°C condensate. This condensate is then discharged from the condensate outlet of the steam turbine 42, flows through the second electric shut-off valve 41, and then sequentially flows through the hot fluid side of the hydrogen preheater 19 and the hot fluid side of the oxygen preheater 18, cooling to 80°C. It then continues to cool to room temperature in the transfer pipeline before entering the water storage tank 32 through the turbine condensate return inlet 321. In the open water storage tank 32, nitrogen in the condensate is released and discharged to the atmosphere.

[0048] A stable hydrothermal flame is generated in the supercritical hydrothermal combustion steam generating device 39 .

[0049] 3) Maintaining stable combustion of the hydrothermal flame in the supercritical hydrothermal combustion steam generator After the hydrothermal flame in the combustion chamber of the supercritical hydrothermal combustion device is stably ignited, the preheating temperature of the fuel solution can be reduced to below the critical temperature of 374°C, or even to room temperature. When injected into the combustion chamber at a low temperature, a stable hydrothermal flame can still be maintained. After a stable hydrothermal flame is generated in the supercritical hydrothermal combustion steam generating device 39, the electric heater bypass valve 38 is opened to bypass the electric heater 37, and the power supply of the electric heater 37 is turned off. The third regulating valve 60 is opened to draw an intermediate extraction steam of 8.1MPa and 400°C from the middle of the steam turbine 42. The flow rate of the intermediate extraction steam is controlled by the opening of the third regulating valve 60. The intermediate extraction steam enters the hot fluid side of the ammonia preheater 36 and heats the 28% ammonia water delivered from the high-pressure ammonia pump 35 to 300°C. After exiting the ammonia preheater 36, the 300°C ammonia flows through the electric heater bypass branch and enters the supercritical hydrothermal combustion steam generator 39 through the ammonia inlet 391. Within the combustion chamber, a supercritical hydrothermal combustion reaction occurs, maintaining a stable hydrothermal flame. The 8.1 MPa, 400°C intermediate extraction steam is cooled to 50°C in the ammonia preheater 36, then reduced to atmospheric pressure through the backpressure valve 30 and enters the water storage tank through the turbine extraction return inlet 325.

[0050] At this point, the supercritical hydrothermal combustion power generation unit has reached a stable operating state. The electricity generated by generator 44 is boosted by the combustion power generation unit transformer 45 and then transmitted to the power grid system 48. The openings of the fourth regulating valve 61, the second regulating valve 59, and the first regulating valve 58 respectively control the flow rates of ammonia, hydrogen, and oxygen entering the supercritical hydrothermal combustion steam generator 39, thereby controlling the power generation of the supercritical hydrothermal combustion power generation unit. This ensures that the combined power generation of the wind and solar power generation units and the supercritical hydrothermal combustion power generation unit matches the power grid system 48's absorption threshold.

[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 coupled wind and solar power generation, ammonia energy storage and supercritical hydrothermal combustion power generation system, characterized in that: The invention comprises a wind-solar power generation unit, a water electrolysis hydrogen production unit, an electrochemical ammonia synthesis energy storage unit and a supercritical water thermal combustion power generation unit, wherein the hydrogen outlet of the water electrolysis hydrogen production unit is connected to the electrochemical ammonia synthesis energy storage unit, and the power output end of the wind-solar power generation unit is connected to the power input end of the water electrolysis hydrogen production unit and the electrochemical ammonia synthesis energy storage unit; a supercritical water thermal combustion steam generating device (39) and a coaxially connected steam turbine (42) and a generator (44) are provided in the supercritical water thermal combustion power generation unit, and the water electrolysis hydrogen production unit and the electrochemical ammonia synthesis energy storage unit are connected to the supercritical water thermal combustion steam generating device (39) and a coaxially connected steam turbine (42) and a generator (44) are provided. The product outlet is connected to a supercritical water thermal combustion steam generating device (39), and an ammonia heating device is provided on the pipeline from the electrochemical ammonia synthesis energy storage unit to the supercritical water thermal combustion steam generating device (39); the water inlet of the electrolytic water hydrogen production unit is connected to a water storage tank (32), and the water storage tank (32) is provided with two pipelines connected to the supercritical water thermal combustion steam generating device (39), one of which is connected to the supercritical water thermal combustion steam generating device (39) through the ammonia heating device, and the supercritical water thermal combustion steam generating device (39) is connected to the steam turbine (42).

2. The coupled wind-solar power generation, ammonia energy storage and supercritical water thermal combustion power generation system according to claim 1 is characterized in that: The ammonia water heating device comprises an ammonia water preheater (36) and an electric heater (37) connected in sequence along the flow direction of the medium, the outlet of the electric heater (37) is connected to the supercritical water thermal combustion steam generating device (39); the electric heater (37) is provided with a bypass pipe, a valve is provided on the bypass pipe, and the power output end of the wind and solar power generation unit is connected to the power input end of the electric heater (37).

3. The coupled wind-solar power generation, ammonia energy storage and supercritical hydrothermal combustion power generation system according to claim 1 is characterized in that: The condensate outlet of the steam turbine (42) is connected in sequence to the hot side of the hydrogen preheater (19), the hot side of the oxygen preheater (18) and the water storage tank (32).

4. The coupled wind-solar power generation, ammonia energy storage and supercritical hydrothermal combustion power generation system according to claim 1 is characterized in that: The steam extraction port of the steam turbine (42) is connected to the hot side inlet of the ammonia water preheater (36), and the hot side outlet of the ammonia water preheater (36) is connected to the water storage tank (32) via the back pressure valve (30).

5. The coupled wind-solar power generation, ammonia energy storage and supercritical water thermal combustion power generation system according to claim 4 is characterized in that: A bypass pipe is provided between the inlet and the steam extraction port of the steam turbine (42), and a valve is provided on the bypass pipe.

6. The coupled wind-solar power generation, ammonia energy storage and supercritical hydrothermal combustion power generation system according to claim 1 is characterized in that: An ammonia inlet (391), an oxygen inlet (393) and a hydrogen inlet (392) are provided on the top of the supercritical hydrothermal combustion steam generating device (39); an ammonia annular groove (394), a hydrogen groove (395), an oxygen annular groove (396) and a combustion chamber are provided in the supercritical hydrothermal combustion steam generating device (39); the ammonia inlet (391) is connected to the ammonia annular groove (394); the hydrogen inlet (392) is connected to the hydrogen groove (395); the oxygen inlet (393) is connected to the oxygen annular groove (396); the ammonia annular groove (394), the hydrogen groove (395) and the oxygen annular groove (396) are all connected to the combustion chamber through an oblique channel; the oblique channels on the oxygen annular groove (396) of the ammonia annular groove (394) are all oriented toward the central axis of the combustion chamber, and the oblique channel of the hydrogen groove (395) is oriented away from the central axis of the combustion chamber; and the side wall of the oxygen annular groove (396) is provided with an oblique channel oriented toward the inner wall of the combustion chamber.

7. The coupled wind-solar power generation, ammonia energy storage and supercritical hydrothermal combustion power generation system according to claim 1 is characterized in that: The electrolytic water hydrogen production unit is provided with a hydrogen buffer tank (9) and an oxygen cooler (12); the electrochemical ammonia synthesis energy storage unit is provided with a PSA air separation device (20) and an electrochemical ammonia synthesis reactor (25); the hydrogen buffer tank (9) is connected to the anode inlet of the electrochemical ammonia synthesis reactor (25); the nitrogen outlet of the PSA air separation device (20) is connected to the cathode inlet of the electrochemical ammonia synthesis reactor (25); the PSA air separation device (20) is also connected to the oxygen cooler (12); a PSA oxygen compressor (21) is provided on the pipeline from the PSA air separation device (20) to the oxygen cooler (12); and the power output end of the wind-solar power generation unit is connected to the power input end of the electrochemical ammonia synthesis reactor (25).

8. The coupled wind-solar power generation, ammonia energy storage and supercritical water thermal combustion power generation system according to claim 7 is characterized in that: The cathode outlet of the electrochemical ammonia synthesis reactor (25) is connected to a liquefaction separation device (26), an ammonia purifier (27) and an ammonia water storage tank (28) in sequence, and the ammonia water storage tank (28) is connected to a supercritical water thermal combustion steam generating device (39) via an ammonia water heating device; the nitrogen outlet of the liquefaction separation device (26) is connected to the cathode inlet of the electrochemical ammonia synthesis reactor (25), and the hydrogen outlet of the liquefaction separation device (26) is connected to the anode inlet of the electrochemical ammonia synthesis reactor (25).

9. A method for coupling wind and solar power generation, ammonia energy storage and supercritical hydrothermal combustion power generation, characterized in that: include: During periods of excess wind and solar resources, the wind and solar power generation units provide electricity to the water electrolysis hydrogen production unit and the electrochemical ammonia synthesis energy storage unit. The electricity from the wind and solar power generation units is stored in the form of products from the water electrolysis hydrogen production unit and the electrochemical ammonia synthesis energy storage unit. The electrolysis water hydrogen production unit produces hydrogen and oxygen. During peak hours of electricity consumption, part of the hydrogen enters the electrochemical ammonia synthesis energy storage unit to participate in the synthesis of liquid ammonia. The water in the water storage tank (32) is heated by the ammonia water heating device and then enters the supercritical water thermal combustion steam generating device (39), which is used to increase the temperature and pressure of the supercritical water thermal combustion steam generating device (39). Oxygen, another part of hydrogen, and ammonia heated by the ammonia heating device enter the supercritical hydrothermal combustion steam generating device (39) to participate in combustion; the high-temperature mixed fluid generated by the ammonia-hydrogen supercritical hydrothermal combustion is mixed with the low-temperature mixed water to obtain mixed water vapor that can be used for steam turbine power generation. The mixed water vapor expands in the steam turbine to perform work, driving the steam turbine to rotate, and the steam turbine drives the generator to generate electricity.

10. The method for coupling wind-solar power generation, ammonia energy storage and supercritical water thermal combustion power generation according to claim 9, characterized in that: Filling the supercritical hydrothermal combustion steam generating device (39) with water and increasing its pressure includes: opening the turbine bypass pipe, starting water to flow out of the outlet of the supercritical hydrothermal combustion steam generating device (39), entering the hot side of the ammonia preheater (36) and the back pressure valve (30), preheating the cold water in the ammonia preheater (36), and maintaining and controlling the pressure of the equipment and pipeline in the supercritical hydrothermal combustion power generation unit through the back pressure valve (30); the preheated water is heated by the electric heater (37) and then transported to the supercritical hydrothermal combustion steam generating device (39) until the pressure of the supercritical hydrothermal combustion steam generating device (39) reaches 25 MPa and the fluid temperature at the outlet of the supercritical hydrothermal combustion steam generating device (39) reaches 450°C; Oxygen, another portion of hydrogen, and ammonia heated by the ammonia heating device enter the supercritical water thermal combustion steam generating device (39) to participate in the combustion including: The hydrothermal flame in the supercritical hydrothermal combustion steam generating device (39) is ignited and the hydrothermal flame in the supercritical hydrothermal combustion steam generating device (39) is maintained to burn stably; when the hydrothermal flame is ignited, the heated 25MPa hydrogen and ammonia water enter the supercritical hydrothermal combustion steam generating device (39), and the 25MPa oxygen enters the supercritical hydrothermal combustion steam generating device (39) after being heated, and the hydrogen, ammonia water and oxygen jets collide with each other, and supercritical hydrothermal combustion ignites, forming a hydrothermal flame; high-pressure mixed water is delivered to the supercritical hydrothermal combustion steam generating device (39), and the high-temperature mixed fluid generated by the combustion is mixed with the low-temperature mixed water to obtain a mixed water vapor of 25MPa and 600°C, and the turbine bypass is disconnected, and the mixed water vapor enters the turbine (42) and expands to do work, and the mixed water vapor becomes 1.6MPa and 200°C condensate after expanding and doing work in the turbine (42), and is discharged from the condensate outlet of the turbine (42), and the condensate is used to preheat the hydrogen and oxygen; When the hydrothermal flame is burning stably, a bypass pipe connected to the electric heater (37) is led out from the middle of the steam turbine (42) with an intermediate extraction steam of 8.1 MPa and 400°C. The intermediate extraction steam enters the hot fluid side of the ammonia preheater (36). The ammonia enters the supercritical hydrothermal combustion steam generating device (39) after passing through the cold side of the ammonia preheater (36) to participate in the supercritical hydrothermal combustion reaction and maintain a stable hydrothermal flame. After being cooled in the ammonia preheater (36), the intermediate extraction steam flows through the back pressure valve (30) to reduce the pressure to normal pressure and enters the water storage tank (32); The flow rates of ammonia, hydrogen and oxygen entering the supercritical hydrothermal combustion steam generating device (39) are adjusted to control the power generation of the supercritical hydrothermal combustion power generation unit.

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