Fuel supply system of ammonia synthesis power station

Abstract

The invention provides a fuel supply system of an ammonia synthesis power supply station, which comprises a solar heat collection unit used for collecting solar energy and converting the solar energy into heat energy; the water electrolysis unit at least comprises a water electrolysis device, and the water electrolysis device utilizes electric power generated by photovoltaic power generation to electrolyze water to generate hydrogen and oxygen; the air separation unit at least comprises an air separation device, and the air separation device is used for separating nitrogen in air; the ammonia synthesis unit at least comprises a mixing cooler, a reactor and an ammonia gas cooler, the mixing cooler is used for cooling and mixing the hydrogen and the nitrogen from the water electrolysis unit and the air separation unit, the reactor is used for enabling the hydrogen and the nitrogen to react to generate ammonia, and the ammonia gas cooler is used for cooling the ammonia gas generated after the reaction; the combustion unit is used for mixing and combusting a mixture of ammonia gas and hydrogen, the conversion efficiency in the ammonia synthesis process is improved, cooling of the ammonia gas after reaction is ensured, the system is efficient and stable in overall operation, and continuous synthesis and supply of the ammonia gas are ensured.

Description

Technical Field

[0001] The present application belongs to the technical field of solar energy utilization and ammonia synthesis, and specifically relates to a technical field of ammonia synthesis. Background Art

[0002] With the global emphasis on sustainable development, the use of renewable energy has become the key to energy transformation. As an advanced energy conversion and storage method, green electricity ammonia technology uses electricity generated by renewable energy to electrolyze water to produce hydrogen, and then reacts hydrogen with nitrogen to produce ammonia. It is not only efficient, safe, and easy to store, but can also effectively absorb new energy electricity and reduce carbon emissions. However, traditional ammonia synthesis and power plant fuel supply systems have problems such as high energy consumption and large carbon emissions. Therefore, it is of great significance to develop an ammonia synthesis power plant fuel supply system that combines photovoltaic and solar thermal refrigeration technologies. Summary of the invention

[0003] In order to solve the above problems, the present application provides a fuel supply system for an ammonia synthesis power station that combines photovoltaics and solar thermal refrigeration to address the deficiencies of the prior art. The system includes a solar thermal collection unit, an absorption refrigeration unit, a water electrolysis unit, an air separation unit, an ammonia synthesis unit and a combustion unit. The specific structure and functions are as follows: Solar thermal collection unit: includes a solar thermal collector and a heat storage device, which can intelligently match the supply and storage of heat according to the current heat supply and demand. After the high-temperature working fluid is output from the solar thermal collector, a part of it enters the generator of the absorption refrigeration unit to heat the dilute refrigerant solution, and the other part enters the heat exchanger to heat the mixed gas of nitrogen and hydrogen. The two high-temperature working fluids after heat exchange are sent back to the solar thermal collector through a delivery pump;

[0004] Absorption refrigeration unit: including generator, evaporator, cold storage device and other components. The evaporator provides low-temperature medium as the cold source for hydrogen cooler, hydrogen and nitrogen mixed gas cooler, ammonia synthesis post-cooler and ammonia liquefaction compression device. The cold storage device is used to store and recycle cold medium;

[0005] Water electrolysis unit: Use the electricity provided by the photovoltaic power generation device to electrolyze water to produce hydrogen and oxygen. The hydrogen is divided into two paths, one for ammonia synthesis, and the other mixed with ammonia and sent to the furnace to increase the ignition speed. Oxygen is sent to the bottom of the furnace to assist combustion.

[0006] Air separation unit: The electricity provided by the photovoltaic power generation device is used to separate air, producing nitrogen and oxygen-rich waste gas. The nitrogen is used for ammonia synthesis, and the waste gas is sent to the furnace together with the oxygen produced by water electrolysis to assist combustion;

[0007] Ammonia synthesis unit: includes mixing cooler, mixing compressor, mixed gas heater, reactor, ammonia cooler, compressor and ammonia separator, etc. Hydrogen and nitrogen react in the reactor to generate ammonia, which is then sent to the liquid ammonia storage device for storage after being cooled, compressed and liquefied.

[0008] Combustion unit: includes furnace and burner etc. Liquid ammonia is decompressed and sent to the first mixer to mix with hydrogen and then sent to the furnace for combustion, providing heat or electricity required by the power station.

[0009] Therefore, the technical problem to be solved by the present application is to provide a fuel supply system for an ammonia synthesis power plant, comprising:

[0010] A solar thermal collection unit, which is used to collect solar energy and convert it into thermal energy;

[0011] An electrolytic water production unit, the electrolytic water unit at least comprising an electrolytic water device, the electrolytic water device utilizing the electricity generated by photovoltaic power generation to electrolyze water to produce hydrogen and oxygen;

[0012] Furthermore, the system also includes: an absorption refrigeration unit, which uses the heat energy generated by the solar thermal collection unit to provide a cold source for the system, making the entire system more flexible. It can adjust the refrigeration capacity according to the actual needs of the system, thereby optimizing the overall performance of the system. In addition, the absorption refrigeration unit can also work in conjunction with other units, such as: electrolysis water production unit, air separation unit, etc., to further improve the overall efficiency of the system;

[0013] The absorption refrigeration unit comprises: a generator, the generator is connected to the heat storage device, the generator uses the heat energy generated by the solar thermal collection unit to heat the refrigerant dilute solution to generate refrigerant vapor and solution;

[0014] An evaporator is connected to the generator, and the evaporator absorbs heat by evaporation of the refrigerant vapor to generate a low-temperature medium.

[0015] An air separation unit, the air separation unit comprising at least an air separation device, the air separation device being used to separate nitrogen from the air;

[0016] an ammonia synthesis unit, the ammonia synthesis unit comprising at least a mixing cooler, a reactor and an ammonia cooler, the mixing cooler being used to cool and mix the hydrogen and nitrogen from the water electrolysis unit and the air separation unit, the reactor being used to react the hydrogen and nitrogen to generate ammonia, and the ammonia cooler being used to cool the ammonia generated after the reaction;

[0017] The combustion unit is used to mix and burn the mixture of ammonia and hydrogen. In the present application, the solar thermal collector unit collects solar energy and converts it into thermal energy, which is a clean and renewable energy source. The electrolysis water production unit uses the electricity generated by photovoltaic power generation to electrolyze water, which also relies on renewable energy, further improving the energy sustainability of the entire system.

[0018] Furthermore, the solar thermal collection unit includes a solar thermal collector and a heat storage device, wherein the solar thermal collector is used to collect solar energy and convert it into thermal energy, and the heat storage device is used to store the thermal energy. The combined use of the solar thermal collection unit and the heat storage device enables the system to adjust the heat energy supply according to actual needs. For example, during periods of sufficient sunlight, the system can make more use of the heat energy generated by the solar thermal collector; while during periods of insufficient sunlight, the system can rely on the heat energy released by the heat storage device to maintain normal operation. This flexibility helps to improve the overall efficiency and adaptability of the system.

[0019] Furthermore, the absorption refrigeration unit also includes a cold storage device, which is arranged on the lower side of the evaporator in the flow direction of the gas, and the cold storage device is used to store the low-temperature medium generated by the absorption refrigeration unit. By storing the low-temperature medium, the cold storage device can continue to provide a refrigeration effect for the system when the heat energy generated by the solar thermal collection unit is insufficient or unstable. This reduces the system's immediate dependence on solar energy and improves energy efficiency. By storing and releasing the low-temperature medium, the system can more efficiently utilize renewable energy such as solar energy and reduce dependence on traditional energy. At the same time, the cold storage device can also reduce the number of system startups and shutdowns, thereby reducing energy consumption and emissions.

[0020] Furthermore, the air separation unit further comprises: a hydrogen gas-water separator, an oxygen gas-water separator, and a hydrogen cooler;

[0021] The hydrogen gas-water separator is connected to the water electrolysis device through a pipeline and is used to separate water and hydrogen in the air;

[0022] The oxygen gas-water separator is connected to the water electrolysis device through a pipeline and is used to separate water and oxygen in the air;

[0023] The hydrogen cooler is connected to the hydrogen gas-water separator and is used to cool the separated hydrogen. The addition of the hydrogen gas-water separator, the oxygen gas-water separator and the hydrogen cooler can significantly improve the gas purity and quality of the air separation unit, protect subsequent equipment and processes, optimize energy utilization and energy saving, and improve the overall performance and reliability of the system.

[0024] Furthermore, the fuel supply system also includes: a hydrogen compressor, which is connected to the hydrogen cooler and is used to compress the cooled hydrogen. By compressing the hydrogen, its density can be significantly increased, thereby increasing the storage capacity of hydrogen per unit volume. This helps to reduce space and cost during storage and transportation and improve storage efficiency. In addition, under certain conditions, hydrogen has the characteristics of being flammable and explosive. By compressing hydrogen, the risk of leakage during storage and transportation can be reduced, thereby improving the safety of the system; a nitrogen compressor, which is connected to the air separation device and is used to compress the separated nitrogen. The compressed nitrogen can react more fully with hydrogen during the ammonia synthesis process, thereby improving the synthesis efficiency of ammonia.

[0025] Furthermore, in the ammonia synthesis reaction, a higher pressure helps the reaction proceed in the direction of generating ammonia, thereby improving the synthesis efficiency of ammonia. Therefore, the ammonia synthesis unit further includes: a mixing compressor, which is arranged on the upper side of the flow of the hydrogen and nitrogen through the reactor and is used to compress the mixed hydrogen and nitrogen;

[0026] The mixed gas heater is arranged at the lower side of the mixed compressor in the gas flow direction. The mixed gas heater uses the heat energy generated by the solar thermal collector unit to heat the mixed gas. The heated mixed gas has a higher temperature, which is conducive to the ammonia synthesis reaction. A higher reaction temperature can accelerate the reaction rate and improve the yield and quality of ammonia. By heating the mixed gas, it can ensure that the temperature in the reactor is kept within a suitable range, which is conducive to the stable reaction. This helps to improve the overall stability and reliability of the system.

[0027] Further, the combustion unit comprises: a furnace, the furnace being used to burn a mixture of ammonia and hydrogen;

[0028] A compressor, the compressor is arranged at the lower side of the ammonia cooler in the gas flow direction, and the compressor is used to compress and liquefy the ammonia after the temperature is reduced by the ammonia cooler;

[0029] an ammonia separator, disposed at the lower side of the reactor in the gas flow direction, the ammonia separator being used to separate the mixed liquid nitrogen and nitrogen;

[0030] A first mixer, disposed at a lower side of the ammonia separator in the gas flow direction, the first mixer being used to mix the ammonia and hydrogen;

[0031] The oxygen supply device is used to provide the oxygen required in the combustion process of ammonia and hydrogen.

[0032] Furthermore, the system further comprises: a liquid nitrogen storage device, which is arranged at the lower side of the ammonia separator in the gas flow direction and is used to store liquid nitrogen;

[0033] Furthermore, the system further comprises: a pressure reducing valve, which is arranged on the upper side of the furnace in the flow direction of the gas and is connected to the air inlet of the furnace.

[0034] Beneficial Effects

[0035] An ammonia synthesis power plant fuel supply system provided in an embodiment of the present invention reduces the consumption of traditional energy and carbon emissions by preferentially utilizing the electricity provided by a photovoltaic power generation device for water electrolysis and air separation. The solar thermal collection unit can intelligently match the supply and storage of heat according to the current heat supply and demand, thereby improving the utilization efficiency of solar energy; by mixing the hydrogen produced by water electrolysis with ammonia and sending it into the furnace, the ignition speed of ammonia is effectively increased, and the combustion efficiency is improved. In addition, the present application plays a role in combustion support and stabilization by sending oxygen and oxygen-rich exhaust gas to the bottom of the furnace, thereby enhancing the low-load operation performance of the power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a connection block diagram of an embodiment of the present application.

[0037] The accompanying drawings are denoted by the following numerals: 1. water electrolysis device; 2. hydrogen gas-water separator; 3. oxygen gas-water separator; 4. hydrogen cooler; 5. hydrogen compressor; 6. first mixer; 7. air separation device; 8. nitrogen compressor; 9. mixing cooler; 10. mixing compressor; 11. mixed gas heater; 12. reactor; 13. ammonia cooler; 14. compressor; 15. ammonia separator; 16. liquid ammonia storage device; 17. pressure reducing valve; 18. solar collector; 19. heat storage device; 20. generator of absorption refrigeration unit; 21. evaporator; 22. cold storage device; 23. second mixer; 24. third mixer. DETAILED DESCRIPTION

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0042] See also Figure 1 As shown, according to an embodiment of the present application, an ammonia synthesis power plant fuel supply system includes: a solar thermal collection unit, the solar thermal collection unit is used to collect solar energy and convert it into thermal energy; an electrolytic water production unit, the electrolytic water unit at least includes an electrolytic water device 1, the electrolytic water device 1 uses the electricity generated by photovoltaic power generation to electrolyze water to produce hydrogen and oxygen; an air separation unit, the air separation unit at least includes an air separation device 7, the air separation device 7 is used to separate nitrogen from the air; an ammonia synthesis unit, the ammonia synthesis unit at least includes a mixing cooler 9, a reactor 12 and an ammonia cooler 13, the mixing cooler 9 is used to cool and mix the hydrogen and nitrogen from the electrolytic water unit and the air separation unit, the reactor 12 is used to react the hydrogen and nitrogen to generate ammonia, and the ammonia cooler 13 is used to cool the ammonia generated after the reaction; a combustion unit, used to mix and burn a mixture of ammonia and hydrogen.

[0043] In a feasible embodiment, the system further includes: an absorption refrigeration unit, which uses the heat energy generated by the solar thermal collection unit for refrigeration, providing a cold source for the system, making the entire system more flexible. It can adjust the cooling capacity according to the actual needs of the system, thereby optimizing the overall performance of the system. In addition, the absorption refrigeration unit can also work in conjunction with other units, such as: electrolysis water production unit, air separation unit, etc., to further improve the overall efficiency of the system; the absorption refrigeration unit includes: a generator 20, the generator 20 is connected to the heat storage device 19, and the generator 20 uses the heat energy generated by the solar thermal collection unit to heat the dilute refrigerant solution to generate refrigerant vapor and solution;

[0044] The evaporator 21 is connected to the generator 20, and the evaporator 21 absorbs heat by evaporation of the refrigerant vapor to produce a low-temperature medium. In the present application, the solar thermal collector unit converts solar energy into thermal energy by collecting solar energy, which is a clean and renewable energy source. The electrolytic water production unit uses the electricity generated by photovoltaic power generation to electrolyze water, which also relies on renewable energy, further improving the energy sustainability of the entire system.

[0045] In this embodiment, the solar thermal collection unit includes a solar thermal collector 18 and a heat storage device 19, wherein the solar thermal collector 18 is used to collect solar energy and convert it into thermal energy, and the heat storage device is used to store the thermal energy. The combined use of the solar thermal collection unit and the heat storage device enables the system to adjust the heat supply according to actual needs. For example, during periods of sufficient sunlight, the system can make more use of the heat energy generated by the solar thermal collector; while during periods of insufficient sunlight, the system can rely on the heat energy released by the heat storage device to maintain normal operation. This flexibility helps to improve the overall efficiency and adaptability of the system.

[0046] In a feasible embodiment, the absorption refrigeration unit further includes a cold storage device 22, which is arranged on the lower side of the evaporator 21 in the flow direction of the gas, and the cold storage device 22 is used to store the low-temperature medium generated by the absorption refrigeration unit. The cold storage device is used to store the low-temperature medium generated by the absorption refrigeration unit. By storing the low-temperature medium, the cold storage device can continue to provide a refrigeration effect for the system when the heat energy generated by the solar thermal collection unit is insufficient or unstable. This reduces the system's immediate dependence on solar energy and improves energy efficiency. By storing and releasing the low-temperature medium, the system can more efficiently utilize renewable energy such as solar energy and reduce dependence on traditional energy. At the same time, the cold storage device can also reduce the number of system startups and shutdowns, thereby reducing energy consumption and emissions.

[0047] In a feasible implementation manner, the air separation unit further comprises: a hydrogen gas-water separator 2, an oxygen gas-water separator 3, and a hydrogen cooler 4;

[0048] The hydrogen gas-water separator 2 is connected to the water electrolysis device 1 through a pipeline and is used to separate water and hydrogen in the air;

[0049] The oxygen gas-water separator 3 is connected to the water electrolysis device 1 through a pipeline and is used to separate water and oxygen in the air;

[0050] The hydrogen cooler 4 is provided in a through connection with the hydrogen gas-water separator 2, and is used to cool the separated hydrogen. The hydrogen cooler is provided in a through connection with the hydrogen gas-water separator, and is used to cool the separated hydrogen. The addition of the hydrogen gas-water separator, the oxygen gas-water separator and the hydrogen cooler can significantly improve the gas purity and quality of the air separation unit, protect subsequent equipment and processes, optimize energy utilization and energy saving, and improve the overall performance and reliability of the system.

[0051] In this embodiment, the fuel supply system also includes: a hydrogen compressor 5, which is connected to the hydrogen cooler 4 and is used to compress the cooled hydrogen. By compressing the hydrogen, its density can be significantly increased, thereby increasing the storage capacity of hydrogen per unit volume. This helps to reduce space and cost during storage and transportation and improve storage efficiency. In addition, under certain conditions, hydrogen has the characteristics of being flammable and explosive. By compressing hydrogen, the risk of leakage during storage and transportation can be reduced, thereby improving the safety of the system; a nitrogen compressor 8, which is connected to the air separation device and is used to compress the separated nitrogen. The compressed nitrogen can react more fully with hydrogen during the ammonia synthesis process, thereby improving the synthesis efficiency of ammonia.

[0052] In a feasible embodiment, in the ammonia synthesis reaction, a higher pressure helps the reaction to proceed in the direction of generating ammonia, thereby improving the synthesis efficiency of ammonia. Therefore, the ammonia synthesis unit further includes: a mixing compressor 10, which is arranged on the upper side of the hydrogen and nitrogen flowing through the reactor 12, and is used to compress the mixed hydrogen and nitrogen;

[0053] The mixed gas heater 11 is arranged at the lower side of the mixed compressor 10 in the gas flow direction. Since the heated mixed gas has a higher temperature, it is beneficial to the ammonia synthesis reaction. A higher reaction temperature can accelerate the reaction rate and improve the yield and quality of ammonia. By heating the mixed gas, it can ensure that the temperature in the reactor is kept within a suitable range, which is beneficial to the stable reaction. This helps to improve the overall stability and reliability of the system. The mixed gas heater 11 uses the heat energy generated by the solar thermal collection unit to heat the mixed gas.

[0054] In a feasible implementation, the combustion unit comprises: a furnace 25, wherein the furnace 25 is used to burn a mixture of ammonia and hydrogen;

[0055] A compressor 14, the compressor 14 is arranged at the lower side of the ammonia cooler 13 in the gas flow direction, and the compressor 14 is used to compress and liquefy the ammonia after being cooled by the ammonia cooler 13;

[0056] An ammonia separator 15 is provided at the lower side of the reactor 12 in the gas flow direction, and the ammonia separator 15 is used to separate the mixed liquid nitrogen and nitrogen;

[0057] A first mixer 6, disposed at the lower side of the ammonia separator 15 in the gas flow direction, the first mixer 6 is used to mix the ammonia and hydrogen;

[0058] The oxygen supply device is used to provide the oxygen required in the combustion process of ammonia and hydrogen.

[0059] In a feasible implementation manner, the system further comprises: a liquid nitrogen storage device 16, the liquid nitrogen storage device 16 being arranged at the lower side of the ammonia separator 15 in the gas flow direction, for storing liquid nitrogen;

[0060] The pressure reducing valve 17 is provided on the upper side of the furnace 25 in the flow direction of the gas.

[0061] In this embodiment, the pressure reducing valve 17 can control the gas pressure in the system to prevent damage to the equipment or safety accidents caused by excessive pressure. During the ammonia synthesis process, the pressure in the furnace may increase as the reaction proceeds. By installing a pressure reducing valve, it can be ensured that the pressure in the furnace is always kept within a safe range. The regulating effect of the pressure reducing valve helps to maintain the stability of the internal pressure of the system, thereby ensuring the smooth progress of the ammonia synthesis reaction. Stable pressure conditions help to improve the efficiency of the reaction and the quality of the product. The pressure reducing valve can also adjust the flow rate of the gas as needed. By adjusting the opening of the pressure reducing valve, the amount of gas entering the furnace can be controlled, thereby achieving the regulation of the reaction rate. This helps to optimize the reaction process and improve the overall performance of the system.

[0062] In this embodiment, the experimental process is specifically as follows: desalted water enters the electrolytic water device 1, and the device preferentially utilizes the configured photoelectric L1 to achieve the purpose of energy saving and emission reduction. The hydrogen separated in the electrolytic water device 1 is divided into two paths, one of which is passed through a pipeline into the hydrogen gas-water separator 2 for gas-water separation, the separated desalted water is sent back to the electrolytic water device 1 through the pipeline below the hydrogen gas-water separator 2, the separated hydrogen is cooled by the cooler 4 and then sent to the hydrogen compressor 5 for preliminary compression, and the other hydrogen is sent to the first mixer 6 through a pipeline and mixed with ammonia and then sent to the furnace together to increase the ignition speed of ammonia. The oxygen separated in the electrolytic water device 1 is passed through a pipeline into the oxygen 2 gas-water separator 3 for gas-water separation, the separated desalted water is sent back to the electrolytic water device 1 through the pipeline below the oxygen gas-water separator 2, and the separated oxygen is sent to the mother pipe M1 through a pipeline and passed to the bottom of the furnace 25 for combustion.

[0063] In this embodiment, air enters the air separation device 7, which preferentially utilizes the configured photoelectric L2 to achieve the purpose of energy saving and emission reduction. The nitrogen separated by the air separation device 7 is sent to the nitrogen compressor 8 through a pipeline for preliminary compression. The oxygen-rich exhaust gas separated by the air separation device 7 is collected in the main pipe M1 through a pipeline and passed into the bottom of the furnace 25 for combustion. The hydrogen preliminarily compressed by the hydrogen compressor 5 and the nitrogen preliminarily compressed by the nitrogen compressor 8 are mixed, and collected in the main pipe M2 and sent to the mixed cooler 9 for further cooling to improve the compression efficiency of the subsequent mixed compressor 10. The nitrogen and hydrogen mixed gas compressed by the mixed compressor 10 is sent to the mixed gas heater 11 through a pipeline for heating to increase the temperature of the mixed gas, thereby increasing the conversion rate of the mixed gas in the reactor 12. The ammonia generated after the reaction is sent out in time through the pipeline to reduce the occurrence of reverse reaction. The sent ammonia enters the ammonia cooler 13 for cooling. After the ammonia cooler 13 cools, the ammonia is sent to the compressor 14 for compression and liquefaction. The compressor 14 preferentially utilizes the configured photoelectric L3 to achieve the purpose of energy saving and emission reduction. The liquid ammonia compressed and liquefied by the compressor 14 is passed into the ammonia separator 15 to separate the ammonia gas and liquid ammonia. The separated liquid ammonia is sent to the liquid ammonia storage device 16 for storage. The liquid ammonia in the liquid ammonia storage device 16 is decompressed by the pressure reducing valve 17 and sent to the first mixer 6. The separated ammonia gas is directly sent to the first mixer 6 to be mixed with hydrogen and then sent to the furnace for combustion.

[0064] In this embodiment, the solar thermal unit with a heat storage device 19 and a solar thermal collector 18 is intelligently allocated by the system according to the current heat level. The high-temperature working fluid heated by the solar thermal unit is divided into two paths. One path of high-temperature working fluid is sent to the mixed gas heater 11 to heat the nitrogen and hydrogen mixed gas before the reaction. After releasing heat, it is sent to the third mixer 24. The system intelligently distributes it back to the heat storage device 19 or the solar thermal collector 18 to absorb heat according to the current heating power of the solar thermal collector 18. The other path of high-temperature working fluid is sent to the generator 20 of the absorption refrigeration unit to heat the dilute refrigerant solution. After releasing heat, it is sent to the third mixer 24. The system intelligently distributes it back to the heat storage device 19 or the solar thermal collector 18 to absorb heat according to the current heating power of the solar thermal collector 18. The absorption refrigeration unit is equipped with a cold storage device 22. The low-temperature medium sent by the evaporator 21 continuously flows through the cold storage device 22 to reduce the temperature of the cold storage medium to achieve the effect of cold storage. The cold medium flowing out of the cold storage device 22 passes through the ammonia cooler 13 and the compressor 14 in parallel to achieve the cooling effect, and then passes through the hydrogen cooler 4 and the mixing cooler 9 in parallel to achieve the cooling effect. The heated cold medium is combined with the second mixer 23, and then the mixed cold medium is sent to the cold storage device 22 through a pipeline to cool down, and the next cycle is carried out after cooling down.

[0065] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0066] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. An ammonia synthesis power plant fuel supply system, characterized in that: include: A solar thermal collection unit, which is used to collect solar energy and convert it into thermal energy; An electrolytic water production unit, the electrolytic water unit comprising at least a water electrolysis device (1), the water electrolysis device (1) utilizing electricity generated by photovoltaic power generation to electrolyze water to produce hydrogen and oxygen; An air separation unit, the air separation unit comprising at least an air separation device (7), the air separation device (7) being used for separating nitrogen from air; An ammonia synthesis unit, the ammonia synthesis unit comprising at least a mixing cooler (9), a reactor (12) and an ammonia cooler (13), the mixing cooler (9) being used to cool and mix the hydrogen and nitrogen from the water electrolysis unit and the air separation unit, the reactor (12) being used to react the hydrogen and nitrogen to generate ammonia, and the ammonia cooler (13) being used to cool the ammonia generated after the reaction; A combustion unit for mixing and combusting a mixture of ammonia and hydrogen.

2. The ammonia synthesis power plant fuel supply system according to claim 1, characterized in that: The solar thermal collection unit comprises a solar thermal collector (18) and a heat storage device (19), wherein the solar thermal collector (18) is used to collect solar energy and convert it into thermal energy, and the heat storage device is used to store the thermal energy.

3. The ammonia synthesis power plant fuel supply system according to claim 2, characterized in that: The system further comprises: an absorption refrigeration unit, which utilizes the heat energy generated by the solar thermal collection unit to perform refrigeration and provide a cold source for the system; The absorption refrigeration unit comprises: a generator (20), the generator (20) being connected to the heat storage device (19), the generator (20) utilizing the heat energy generated by the solar thermal collection unit to heat the dilute refrigerant solution to generate refrigerant vapor and solution; An evaporator (21), the evaporator (21) is connected to the generator (20), and the evaporator (21) absorbs heat by evaporation of the refrigerant vapor to generate a low-temperature medium.

4. The ammonia synthesis power plant fuel supply system according to claim 3, characterized in that: The absorption refrigeration unit further comprises a cold storage device (22) which is arranged on the lower side of the evaporator (21) in the flow direction of the gas, and the cold storage device (22) is used to store the low-temperature medium generated by the absorption refrigeration unit.

5. The ammonia synthesis power plant fuel supply system according to claim 1, characterized in that: The air separation unit further comprises: a hydrogen gas-water separator (2), an oxygen gas-water separator (3), and a hydrogen cooler (4); The hydrogen gas-water separator (2) is connected to the water electrolysis device (1) through a pipeline and is used to separate water and hydrogen in the air; The oxygen gas-water separator (3) is connected to the water electrolysis device (1) through a pipeline and is used to separate water and oxygen in the air; The hydrogen cooler (4) is arranged to be connected to the hydrogen gas-water separator (2) and is used to cool the separated hydrogen.

6. The ammonia synthesis power plant fuel supply system according to claim 5, characterized in that: The fuel supply system further comprises: a hydrogen compressor (5), the hydrogen compressor (5) being in communication with the hydrogen cooler (4) and being used for compressing the cooled hydrogen; A nitrogen compressor (8), the nitrogen compressor (8) is connected to the air separation device (7) and is used to compress the separated nitrogen.

7. The ammonia synthesis power plant fuel supply system according to claim 1, characterized in that: The ammonia synthesis unit further comprises: a mixing compressor (10), the mixing compressor (10) being arranged on the upper side of the hydrogen and nitrogen flowing through the reactor (12), and being used for compressing the mixed hydrogen and nitrogen; The mixed gas heater (11) is arranged on the lower side of the mixed compressor (10) in the gas flow direction, and the mixed gas heater (11) uses the heat energy generated by the solar thermal collection unit to heat the mixed gas.

8. The ammonia synthesis power plant fuel supply system according to claim 1, characterized in that: The combustion unit comprises: a furnace (25), wherein the furnace (25) is used to burn a mixture of ammonia and hydrogen; A compressor (14), the compressor (14) being arranged at a lower side of the ammonia cooler (13) in a gas flow direction, the compressor (14) being used for compressing and liquefying the ammonia after the temperature is reduced by the ammonia cooler (13); an ammonia separator (15), arranged at the lower side of the reactor (12) in the gas flow direction, the ammonia separator (15) being used to separate the mixed liquid nitrogen and nitrogen; a first mixer (6), arranged at the lower side of the ammonia separator (15) in the gas flow direction, the first mixer (6) being used to mix the ammonia and hydrogen; The oxygen supply device is used to provide the oxygen required for the combustion of ammonia and hydrogen.

9. The ammonia synthesis power plant fuel supply system according to claim 8, characterized in that: The system further comprises: a liquid nitrogen storage device (16), wherein the liquid nitrogen storage device (16) is arranged at the lower side of the ammonia separator (15) in the gas flow direction and is used for storing liquid nitrogen.

10. The ammonia synthesis power plant fuel supply system according to claim 8, characterized in that: The system further comprises a pressure reducing valve (17), wherein the pressure reducing valve (17) is arranged on the upper side of the furnace (25) in the flow direction of the gas and is connected to the air inlet of the furnace (25).

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