Ammonia fuel power plant and method powered by a turboshaft engine and a fuel cell

Abstract

The present application relates to power generation technical field, especially to a kind of ammonia fuel power generation device and method powered by turbo-shaft engine and fuel cell.The ammonia fuel power generation device powered by turbo-shaft engine and fuel cell provided by the present application, since turbo-shaft engine uses ammonia as main fuel, uses hydrogen produced by ammonia after cracking in ammonia cracking unit as ignition and combustion-supporting fuel, ensures stable and continuous combustion of ammonia in turbo-shaft engine combustion chamber, thereby improves the combustion stability and efficiency of turbo-shaft engine;Since the fuel supply of turbo-shaft engine is more continuous, avoid the problem that high-pressure liquid ammonia injector in internal combustion engine cannot be self-lubricated, needs high-frequency opening and closing, resulting in life decline;In addition, since the cooling loss of turbo-shaft engine is smaller, the higher grade heat energy contained in exhaust gas can be recovered, the total amount of available sensible heat and shaft work is more, which is beneficial to improve the energy utilization efficiency of system.

Description

Technical Field

[0001] This invention relates to the field of power generation technology, and in particular to an ammonia fuel power generation device and method powered by a turboshaft engine and a fuel cell. Background Technology

[0002] Ammonia is a zero-carbon fuel. As the world's second-largest synthetic chemical product, ammonia production processes are highly mature, enabling large-scale, low-cost production, storage, transportation, and supply globally. Ammonia is easily liquefied at room temperature and pressure, and its high hydrogen storage density and lack of the need for high-pressure tank storage give it a significant energy density advantage in mass- and volume-sensitive applications. However, existing ammonia-fueled power generation systems, due to the use of internal combustion engines, suffer from low energy efficiency and poor stability. Summary of the Invention

[0003] This invention provides an ammonia fuel power generation device powered by a turboshaft engine and a fuel cell, which solves the problems of low energy utilization and poor stability of existing ammonia fuel power generation systems.

[0004] This invention provides an ammonia fuel power generation device powered by a turboshaft engine and a fuel cell, comprising: Generator assembly; An air compression assembly for compressing air; A turboshaft engine combustion chamber, which is connected to the air compression assembly; The turboshaft engine turbine is connected to the combustion chamber of the turboshaft engine and is connected to the generator assembly via a first connecting shaft. The turboshaft engine turbine is used to drive the generator assembly to generate electricity. An ammonia cracking unit is provided, wherein the exhaust gas inlet of the ammonia cracking unit is connected to the exhaust gas outlet of the turboshaft engine turbine, and the ammonia cracking unit is used to crack ammonia by utilizing the exhaust gas heat delivered by the turboshaft engine turbine. A heat exchange assembly is connected to the ammonia pipeline, the ammonia cracking unit, and the turboshaft engine combustion chamber. The heat exchange assembly is used to exchange heat with the ammonia using the exhaust gas transported by the ammonia cracking unit and the heat carried by the cracked gas. A portion of the heated ammonia is then transported to the turboshaft engine combustion chamber to burn together with air and cracked gas, while the remaining ammonia is transported to the ammonia cracking unit for cracking.

[0005] According to the present invention, an ammonia fuel power generation device powered by a turboshaft engine and a fuel cell is provided, wherein the air compression assembly includes: A low-pressure compressor, wherein the low-pressure compressor is used to perform primary compression of air; A high-pressure compressor, wherein the compressed air inlet of the high-pressure compressor is connected to the compressed air outlet of the low-pressure compressor, and the compressed air outlet of the high-pressure compressor is connected to the compressed air inlet of the turboshaft engine combustion chamber, and the high-pressure compressor is used to perform secondary compression on the air after primary compression.

[0006] According to the present invention, an ammonia fuel power generation device powered by a turboshaft engine and a fuel cell is provided, wherein the air compression assembly further includes: The turboshaft engine intercooler has its compressed air inlet connected to the compressed air outlet of the low-pressure compressor, and its compressed air outlet connected to the compressed air inlet of the high-pressure compressor. The turboshaft engine intercooler is used to cool the air after the first stage of compression.

[0007] According to the present invention, an ammonia fuel power generation device powered by a turboshaft engine and a fuel cell is provided, wherein the exhaust port of the turboshaft engine combustion chamber is connected to the intake port of the turboshaft engine turbine, and the turboshaft engine turbine is connected to the rotating shaft of the turboshaft engine combustion chamber via a second connecting shaft.

[0008] According to the present invention, an ammonia fuel power generation device powered by a turboshaft engine and a fuel cell is provided, wherein the rotating shaft of the high-pressure compressor is connected to the rotating shaft of the low-pressure compressor via a third connecting shaft, and the rotating shaft of the high-pressure compressor is connected to the rotating shaft of the turboshaft engine combustion chamber via a fourth connecting shaft.

[0009] According to the present invention, an ammonia fuel power generation device powered by a turboshaft engine and a fuel cell is provided, wherein the generator assembly includes: A generator, wherein the turbine of the turboshaft engine is connected to the rotating shaft of the generator via the first connecting shaft; An AC-DC converter is provided, wherein the input terminal of the AC-DC converter is electrically connected to the output terminal of the generator, and the output terminal of the AC-DC converter is electrically connected to a bus.

[0010] According to the present invention, an ammonia fuel power generation device powered by a turboshaft engine and a fuel cell is provided, wherein the heat exchange assembly includes: The first heat exchanger has an ammonia inlet connected to an ammonia pipeline, an ammonia outlet connected to the ammonia inlet of the turboshaft engine combustion chamber via a first pipeline, and an exhaust gas inlet connected to the exhaust gas outlet of the ammonia cracking unit. The second heat exchanger has an ammonia inlet connected to the ammonia outlet of the first heat exchanger, an ammonia outlet connected to the ammonia inlet of the ammonia cracking unit, a cracked gas inlet connected to the cracked gas outlet of the ammonia cracking unit, and a cracked gas outlet connected to the cracked gas inlet of the turboshaft engine combustion chamber via a second pipeline.

[0011] An ammonia fuel power generation device powered by a turboshaft engine and a fuel cell, provided by the present invention, further includes: A fuel cell assembly includes a hydrogen separation unit and a fuel cell. The cracked gas inlet of the hydrogen separation unit is connected to a second pipeline, and the input end of the hydrogen separation unit is electrically connected to a bus. The hydrogen inlet of the fuel cell is connected to the hydrogen outlet of the hydrogen separation unit, and the output end of the fuel cell is electrically connected to the bus.

[0012] An ammonia fuel power generation device powered by a turboshaft engine and a fuel cell, provided by the present invention, further includes: The exhaust gas treatment unit has an ammonia inlet connected to the ammonia pipeline and an exhaust gas inlet connected to the exhaust gas outlet of the first heat exchanger. An energy storage unit, which is electrically connected to a bus, is used to store energy; The fuel cell assembly also includes: A DC-DC converter, wherein the input terminal of the DC-DC converter is electrically connected to the output terminal of the fuel cell, and the output terminal of the DC-DC converter is electrically connected to a bus.

[0013] The present invention also provides a method for generating electricity using ammonia fuel powered by a turboshaft engine and a fuel cell, wherein the method generates electricity using the ammonia fuel power generation device powered by a turboshaft engine and a fuel cell as described in any of the preceding claims, and the method includes: The ammonia gas is heated by the exhaust gas from the ammonia cracking unit in the first heat exchanger. A portion of the heated ammonia gas is then sent to the combustion chamber of the turboshaft engine to burn with air and cracked gas. The remaining ammonia gas is sent to the second heat exchanger, where it is heated again by the heat carried by the cracked gas output from the ammonia cracking unit. The ammonia gas after this second heat exchange is then sent back to the ammonia cracking unit for cracking. After passing through the second heat exchanger, a portion of the cracked gas from the ammonia cracking unit enters the combustion chamber of the turboshaft engine to burn with air and ammonia. The other portion of the cracked gas enters the hydrogen separation unit for separation and purification. The hydrogen gas discharged from the hydrogen separation unit enters the fuel cell to react with air and generate electricity. Air is first compressed by a low-pressure compressor, and then compressed a second time by a high-pressure compressor. The compressed air enters the combustion chamber of the turboshaft engine and is burned together with cracked gas and ammonia. The exhaust gas after combustion enters the turboshaft engine turbine to do work. The turboshaft engine turbine drives a generator to generate electricity. The exhaust gas output from the turboshaft engine turbine enters the ammonia cracking unit to exchange heat with ammonia, and then enters the first heat exchanger to exchange heat with ammonia. The exhaust gas after heat exchange enters the exhaust gas treatment unit.

[0014] The ammonia fuel power generation device powered by a turboshaft engine and a fuel cell provided by this invention ensures stable and continuous combustion of ammonia in the turboshaft engine combustion chamber, thereby improving the combustion stability and efficiency of the turboshaft engine. Furthermore, the more continuous fuel supply of the turboshaft engine avoids the problem of reduced lifespan caused by the high-pressure liquid ammonia injectors in internal combustion engines requiring frequent opening and closing when they lack self-lubrication. In addition, the turboshaft engine has lower cooling losses and contains higher-grade heat energy in its exhaust gas that can be recovered, resulting in a greater total amount of usable sensible heat and shaft work, which is beneficial for improving the system's energy utilization efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is one of the flowcharts of the XXXX method provided by the present invention.

[0017] Figure label: 1. First heat exchanger; 2. Low-pressure compressor; 3. Turboshaft engine intercooler; 4. High-pressure compressor; 5. Turboshaft engine combustion chamber; 6. Turboshaft engine turbine; 7. Generator; 8. AC-DC converter; 9. Second heat exchanger; 10. Ammonia cracking unit; 11. Hydrogen separation unit; 12. Fuel cell; 13. DC-DC converter; 14. Exhaust gas treatment unit; 15. Energy storage unit; 16. First pipeline; 17. Second pipeline; 18. First connecting shaft; 19. Second connecting shaft; 20. Third connecting shaft; 21. Fourth connecting shaft. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0019] like Figure 1 As shown, the power generation device powered by the turboshaft engine and fuel cell 12 includes a generator assembly, an air compression assembly, a turboshaft engine combustion chamber 5, a turboshaft engine turbine 6, an ammonia cracking unit 10, and a heat exchange assembly. The air compression assembly is used to compress air, and the turboshaft engine combustion chamber 5 is connected to the air compression assembly. The turboshaft engine turbine 6 is connected to the turboshaft engine combustion chamber 5 and is connected to the generator assembly through a first connecting shaft 18. The turboshaft engine turbine 6 is used to drive the generator assembly to generate electricity.

[0020] The exhaust gas inlet of the ammonia cracking unit 10 is connected to the exhaust gas outlet of the turboshaft engine turbine 6. The ammonia cracking unit 10 is used to crack ammonia using the heat of the exhaust gas delivered by the turboshaft engine turbine 6. The heat exchange assembly is connected to the ammonia pipeline, the ammonia cracking unit 10 and the turboshaft engine combustion chamber 5. The heat exchange assembly is used to exchange heat with the ammonia using the heat carried by the exhaust gas delivered by the ammonia cracking unit 10 and the cracked gas. A portion of the heated ammonia is then delivered to the turboshaft engine combustion chamber 5 to burn together with air and cracked gas. The remaining portion of the ammonia is then delivered to the ammonia cracking unit 10 for cracking.

[0021] The present invention provides a power generation device powered by a turboshaft engine and a fuel cell 12. Since the turboshaft engine uses ammonia as the main fuel, and the ammonia cracking unit 10 uses hydrogen produced by cracking a portion of the ammonia as ignition and combustion-supporting fuel, it is sent into the turboshaft engine combustion chamber 5. This method utilizes the wide combustion range and fast flame propagation speed of hydrogen to provide a stable ignition source and combustion-supporting agent for ammonia fuel, which helps to ensure the stable and continuous combustion of ammonia in the combustion chamber, thereby improving the combustion stability and combustion efficiency of the turboshaft engine to a certain extent.

[0022] In addition, since turboshaft engines use a continuous combustion mode, their fuel supply is also more continuous. Compared with the reciprocating internal combustion engine, this avoids the problem of the high-pressure liquid ammonia injectors in internal combustion engines needing to be opened and closed frequently when they cannot self-lubricate, which leads to a decrease in lifespan. This helps to improve the long-term operational reliability of the fuel supply system.

[0023] In addition, compared with reciprocating internal combustion engines, turboshaft engines have relatively small cooling losses, which means that their exhaust gas contains higher-grade heat energy that can be recovered and utilized. By recovering this high-grade heat energy and combining it with the shaft power output of the turboshaft engine, the total amount of sensible heat and shaft power that the system can utilize is increased, thereby improving the energy utilization efficiency of the entire system.

[0024] Finally, the ammonia fuel for the turboshaft engine combustion chamber is supplied at near-atmospheric pressure. This supply method eliminates the need for high-pressure pumps or compressors in the fuel delivery pipeline system, reducing the requirements for component selection and pipeline pressure rating. Consequently, the overall structural complexity and control difficulty are also reduced. Simultaneously, the system utilizes the high-temperature, high-enthalpy exhaust gas from the turboshaft engine to provide high-grade heat energy for the endothermic reaction in the ammonia cracking unit, recovering and utilizing some of the heat that would otherwise be discharged, thus providing a heat source for the ammonia cracking reaction and reducing the need for dedicated heating equipment (such as electric heaters or burners for additional fuel) for the ammonia cracking unit. Furthermore, by adjusting the power demand of the fuel cell, the amount of hydrogen supplied to the fuel cell can be changed, thereby altering the workload of the ammonia cracking unit and indirectly regulating the heat absorbed from the turboshaft engine exhaust. This coupled regulation method provides a way for the entire power generation unit to dynamically allocate energy and heat flow in response to changing load demands, allowing the coordinated operation of the turboshaft engine and fuel cell power sources, as well as the degree of waste heat recovery, to be adjusted according to the operating strategy.

[0025] In one embodiment of the present invention, the air compression assembly includes a low-pressure compressor 2 and a high-pressure compressor 4. Air first enters the low-pressure compressor 2 for primary compression. After primary compression, the air's pressure and temperature increase, and it then enters the high-pressure compressor 4. The compressed air inlet of the high-pressure compressor 4 is connected to the compressed air outlet of the low-pressure compressor 2 to receive the primary compressed air. The air undergoes secondary compression in the high-pressure compressor 4, and its compressed air outlet is connected to the compressed air inlet of the turboshaft engine combustion chamber 5, delivering air that meets the combustion chamber pressure requirements. This staged compression method distributes the overall compression process across two independent compressors, resulting in a lower pressure ratio for each compressor. This helps each stage of the compressor operate within its most efficient operating range, thus contributing to reducing the overall power consumption of the compression process.

[0026] In one embodiment of the present invention, the air compression assembly further includes a turboshaft engine intercooler 3. The compressed air inlet of the turboshaft engine intercooler 3 is connected to the compressed air outlet of the low-pressure compressor 2, and the compressed air outlet of the turboshaft engine intercooler 3 is connected to the compressed air inlet of the high-pressure compressor 4. The turboshaft engine intercooler 3 is used to cool the air after the first stage of compression. By setting the turboshaft engine intercooler 3 between the low-pressure compressor 2 and the high-pressure compressor 4 to cool the air after the first stage of compression, its temperature can be reduced, thereby reducing the power consumption required for subsequent compression by the high-pressure compressor 4 and reducing the temperature of the air finally entering the combustion chamber.

[0027] In one embodiment of the present invention, the exhaust port of the turboshaft engine combustion chamber 5 is connected to the intake port of the turboshaft engine turbine 6. The exhaust gas after combustion enters the turboshaft engine turbine 6 for expansion and work, converting the thermal and pressure energy of the combustion gas into the rotational mechanical energy of the turbine rotor. Simultaneously, the turboshaft engine turbine 6 is connected to the rotating shaft of the turboshaft engine combustion chamber 5 via a second connecting shaft 19. This mechanical connection transfers a portion of the rotational mechanical energy generated by the turboshaft engine turbine 6 to the air compression assembly. In this way, the turboshaft engine turbine 6 drives the operation of the air compression assembly, supplying a continuous supply of compressed air to the combustion chamber, thereby achieving self-sustaining engine operation.

[0028] In one embodiment of the invention, the shaft of the high-pressure compressor 4 is connected to the shaft of the low-pressure compressor 2 via a third connecting shaft 20. Simultaneously, the shaft of the high-pressure compressor 4 is connected to the shaft of the turboshaft engine combustion chamber 5 via a fourth connecting shaft 21. This mechanical connection allows the low-pressure compressor 2, the high-pressure compressor 4, and the turbine driving them to collectively form a single-rotor system. Since all these rotating components are rigidly connected to the same main shaft, they will operate synchronously at exactly the same rotational speed.

[0029] In one embodiment of the present invention, the generator assembly includes a generator 7 and an AC-DC converter 8. The turboshaft engine turbine 6 is connected to the rotating shaft of the generator 7 via a first connecting shaft 18. This connection transfers the rotational mechanical energy output by the turboshaft engine turbine 6 to the generator 7, thereby driving the generator 7 to rotate and generate electricity. The input terminal of the AC-DC converter 8 is electrically connected to the output terminal of the generator 7, and is used to rectify and convert the AC power output by the generator 7. The output terminal of the AC-DC converter 8 is electrically connected to a bus, transmitting the converted DC power to the bus. By setting the AC-DC converter 8, the electrical energy generated by the generator 7 can be adapted to a DC power supply architecture, facilitating parallel connection with DC devices such as the fuel cell 12 and energy storage units within the system, or enabling unified power management.

[0030] In one embodiment of the present invention, the heat exchange assembly includes a first heat exchanger 1 and a second heat exchanger 9. The exhaust gas inlet of the first heat exchanger 1 is connected to the exhaust gas outlet of the ammonia cracking unit 10 to recover the heat carried by the exhaust gas discharged after the reaction of the ammonia cracking unit 10. At the same time, its ammonia gas inlet is connected to an ammonia gas pipeline to receive ammonia from the storage and supply system. The ammonia gas from the pipeline is preheated by the exhaust gas in the first heat exchanger 1. The preheated ammonia gas is then split, and a portion of it is transported through the first pipeline 16 to the ammonia gas inlet of the turboshaft engine combustion chamber 5 to participate in combustion as the main fuel.

[0031] The second heat exchanger 9 enables the recovery and utilization of higher-grade heat. The cracked gas inlet of the second heat exchanger 9 is connected to the cracked gas outlet of the ammonia cracking unit 10, used to recover the sensible heat carried by the high-temperature cracked gas after the cracking reaction. Simultaneously, the ammonia inlet of the second heat exchanger 9 is connected to the ammonia outlet of the first heat exchanger 1, receiving another portion of the ammonia gas flow preheated by the first heat exchanger 1. This portion of ammonia gas is further heated by the high-temperature cracked gas in the second heat exchanger 9, and then transported through the ammonia outlet of the second heat exchanger 9 to the ammonia inlet of the ammonia cracking unit 10 for cracking reaction. Through this two-stage heat exchange arrangement, the system uses waste heat of different temperature levels to heat ammonia gas flows targeting different purposes, providing preheating for the ammonia gas entering the combustion chamber, and simultaneously supplying some of the heat required for the reaction of the ammonia gas entering the ammonia cracking unit 10. This helps reduce the external heat demand of the ammonia cracking unit 10 and contributes to improving the overall energy utilization efficiency of the system. The pyrolysis gas, after being cooled by the second heat exchanger 9, is then transported to the pyrolysis gas inlet of the turboshaft engine combustion chamber 5 through its pyrolysis gas outlet and the second pipeline 17, serving as ignition and combustion-supporting fuel.

[0032] In one embodiment of the present invention, the power generation device powered by the turboshaft engine and fuel cell 12 further includes a fuel cell assembly, comprising a hydrogen separation unit 11 and a fuel cell 12. The cracked gas inlet of the hydrogen separation unit 11 is connected to a second pipeline 17. This connection allows a portion of the cracked gas generated from the ammonia cracking unit 10 to be diverted and enter the hydrogen separation unit 11, providing raw materials for subsequent hydrogen extraction and electrochemical power generation. Simultaneously, the input end of the hydrogen separation unit 11 is electrically connected to a bus, providing the necessary electrical energy for its operation. The hydrogen inlet of the fuel cell 12 is connected to the hydrogen outlet of the hydrogen separation unit 11. Through this connection, hydrogen that has been separated and purified to meet the standards for use by the fuel cell 12 is delivered to the fuel cell 12, providing fuel of the required purity for the electrochemical reaction of the fuel cell 12. The output end of the fuel cell 12 is electrically connected to a bus, feeding the DC power generated through the electrochemical reaction into the bus.

[0033] In one embodiment of the present invention, the fuel cell assembly further includes a DC-DC converter 13, the input terminal of which is electrically connected to the output terminal of the fuel cell 12, and the output terminal of which is electrically connected to the bus. The DC-DC converter 13 achieves stable feeding of the generated energy of the fuel cell 12 into the power bus by boosting or reducing the converted voltage to a level that matches the bus voltage.

[0034] In one embodiment of the present invention, the power generation device powered by the turboshaft engine and fuel cell 12 further includes an exhaust gas treatment unit 14. The ammonia inlet of the exhaust gas treatment unit 14 is connected to an ammonia pipeline, and the exhaust gas inlet of the exhaust gas treatment unit 14 is connected to the exhaust gas outlet of the first heat exchanger 1. The exhaust gas treatment unit 14 is used to receive the exhaust gas discharged from the turboshaft engine and cooled by heat exchange in the first heat exchanger 1. Simultaneously, its ammonia inlet is connected to an ammonia pipeline, introducing ammonia as a reactant. Inside the exhaust gas treatment unit 14, the introduced ammonia reacts with specific components (e.g., nitrogen oxides) in the exhaust gas under the action of a catalyst, converting these components into other substances. By providing this exhaust gas treatment unit 14, the composition of the gas ultimately discharged into the atmosphere is adjusted; this function is used to meet specific emission requirements.

[0035] In one embodiment of the present invention, the power generation device powered by the turboshaft engine and the fuel cell 12 further includes an energy storage unit 15, which is electrically connected to the bus and is used to store energy.

[0036] Furthermore, the ammonia cracking unit 10 is electrically connected to the bus. During the start-up phase, the electrical energy from the energy storage unit 15 provides power to the electric heating device in the ammonia cracking unit 10 to crack ammonia, and the turboshaft engine starts working. During the stable operation phase, after the turboshaft engine has stabilized, it begins to provide stable heat to the ammonia cracking unit 10 containing the electric heating device. The electric heating device in the ammonia cracking unit 10 stops working. The control unit matches the fuel cell operating point according to the bus current demand, adjusts the ammonia supply by controlling the flow rate of ammonia entering the first heat exchanger 1, and adjusts the air supply to the fuel cell and the turboshaft engine.

[0037] The present invention also provides a power generation method powered by a turboshaft engine and a fuel cell 12. The power generation method utilizes the power generation device powered by a turboshaft engine and a fuel cell 12 as described in any of the above embodiments to generate electricity. The power generation method includes: The ammonia gas is heated by the exhaust gas from the ammonia cracking unit 10 through the first heat exchanger 1. A portion of the heated ammonia gas is then sent to the turboshaft engine combustion chamber 5 to burn together with air and cracked gas. The remaining ammonia gas is sent to the second heat exchanger 9, where it is heated again by the heat carried by the cracked gas output from the ammonia cracking unit 10. The ammonia gas after the second heat exchange is then sent to the ammonia cracking unit 10 for cracking. After passing through the second heat exchanger 9, a portion of the cracked gas from the ammonia cracking unit 10 enters the turboshaft engine combustion chamber 5 to burn together with air and ammonia. The other portion of the cracked gas enters the hydrogen separation unit 11 for separation and purification. The hydrogen gas discharged from the hydrogen separation unit 11 enters the fuel cell 12 to react with air and generate electricity. Air is compressed in the first stage by the low-pressure compressor 2, and then compressed in the second stage by the high-pressure compressor 4. The compressed air enters the combustion chamber 5 of the turboshaft engine and is burned together with cracked gas and ammonia. The exhaust gas after combustion enters the turboshaft engine turbine 6 to do work. The turboshaft engine turbine 6 drives the generator 7 to generate electricity. The exhaust gas output from the turboshaft engine turbine 6 enters the ammonia cracking unit 10 to exchange heat with ammonia, and then enters the first heat exchanger 1 to exchange heat with ammonia. The exhaust gas after heat exchange enters the exhaust gas treatment unit 14.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ammonia fuel power generation device powered by a turboshaft engine and a fuel cell, characterized in that, include: Generator assembly; An air compression assembly for compressing air; The turboshaft engine combustion chamber (5) is connected to the air compression assembly; The turboshaft engine turbine (6) is connected to the turboshaft engine combustion chamber (5). The turboshaft engine turbine (6) is connected to the generator assembly via a first connecting shaft (18). The turboshaft engine turbine (6) is used to drive the generator assembly to generate electricity. The ammonia cracking unit (10) has its exhaust gas inlet connected to the exhaust gas outlet of the turboshaft engine turbine (6). The ammonia cracking unit (10) is used to crack ammonia by utilizing the exhaust gas heat delivered by the turboshaft engine turbine (6). The heat exchange assembly is connected to the ammonia pipeline, the ammonia cracking unit (10), and the turboshaft engine combustion chamber (5). The heat exchange assembly is used to exchange heat with the ammonia by using the exhaust gas transported by the ammonia cracking unit (10) and the heat carried by the cracked gas. A portion of the heated ammonia is transported to the turboshaft engine combustion chamber (5) to be burned together with air and cracked gas. The remaining ammonia is transported to the ammonia cracking unit (10) for cracking.

2. The ammonia fuel power generation device powered by a turboshaft engine and a fuel cell according to claim 1, characterized in that, The air compression assembly includes: Low-pressure compressor (2), the low-pressure compressor (2) is used to perform primary compression of air; The high-pressure compressor (4) has its compressed air inlet connected to the compressed air outlet of the low-pressure compressor (2), and its compressed air outlet connected to the compressed air inlet of the turboshaft engine combustion chamber (5). The high-pressure compressor (4) is used to perform secondary compression on the air after primary compression.

3. The ammonia fuel power generation device powered by a turboshaft engine and a fuel cell according to claim 2, characterized in that, The air compression assembly also includes: The turboshaft engine intercooler (3) has its compressed air inlet connected to the compressed air outlet of the low-pressure compressor (2), and its compressed air outlet connected to the compressed air inlet of the high-pressure compressor (4). The turboshaft engine intercooler (3) is used to cool the air after primary compression.

4. The ammonia fuel power generation device powered by a turboshaft engine and a fuel cell according to claim 2, characterized in that, The exhaust port of the turboshaft engine combustion chamber (5) is connected to the intake port of the turboshaft engine turbine (6), and the turboshaft engine turbine (6) is connected to the rotating shaft of the turboshaft engine combustion chamber (5) through a second connecting shaft (19).

5. The ammonia fuel power generation device powered by a turboshaft engine and a fuel cell according to any one of claims 2 to 4, characterized in that, The shaft of the high-pressure compressor (4) is connected to the shaft of the low-pressure compressor (2) via a third connecting shaft (20), and the shaft of the high-pressure compressor (4) is connected to the shaft of the turboshaft engine combustion chamber (5) via a fourth connecting shaft (21).

6. The ammonia fuel power generation device powered by a turboshaft engine and a fuel cell according to any one of claims 1 to 4, characterized in that, The generator assembly includes: The generator (7) is connected to the rotating shaft of the turboshaft engine (6) via the first connecting shaft (18); An AC-DC converter (8) is provided, the input terminal of which is electrically connected to the output terminal of the generator (7), and the output terminal of which is electrically connected to the bus.

7. The ammonia fuel power generation device powered by a turboshaft engine and a fuel cell according to any one of claims 1 to 4, characterized in that, The heat exchange assembly includes: The first heat exchanger (1) has an ammonia inlet connected to an ammonia pipeline, and its ammonia outlet is connected to the ammonia inlet of the turboshaft engine combustion chamber (5) via a first pipeline (16). The exhaust gas inlet of the first heat exchanger (1) is connected to the exhaust gas outlet of the ammonia cracking unit (10). The second heat exchanger (9) has an ammonia inlet connected to the ammonia outlet of the first heat exchanger (1), an ammonia outlet connected to the ammonia inlet of the ammonia cracking unit (10), a cracked gas inlet connected to the cracked gas outlet of the ammonia cracking unit (10), and a cracked gas outlet connected to the cracked gas inlet of the turboshaft engine combustion chamber (5) via a second pipeline (17).

8. The ammonia fuel power generation device powered by a turboshaft engine and a fuel cell according to claim 7, characterized in that, Also includes: The fuel cell assembly includes a hydrogen separation unit (11) and a fuel cell (12). The cracked gas inlet of the hydrogen separation unit (11) is connected to the second pipeline (17), and the input end of the hydrogen separation unit (11) is electrically connected to the bus. The hydrogen inlet of the fuel cell (12) is connected to the hydrogen outlet of the hydrogen separation unit (11), and the output end of the fuel cell (12) is electrically connected to the bus.

9. The ammonia fuel power generation device powered by a turboshaft engine and a fuel cell according to claim 8, characterized in that, Also includes: The tail gas treatment unit (14) has an ammonia inlet connected to the ammonia pipeline and a tail gas inlet connected to the tail gas outlet of the first heat exchanger (1). An energy storage unit (15) is electrically connected to a bus and is used to store energy. The fuel cell assembly also includes: A DC-DC converter (13) is provided, the input of which is electrically connected to the output of the fuel cell (12), and the output of which is electrically connected to the bus.

10. A method for generating electricity using ammonia fuel powered by a turboshaft engine and a fuel cell, wherein the method generates electricity using the ammonia fuel power generation device powered by a turboshaft engine and a fuel cell as described in claims 1 to 9, characterized in that... The power generation method includes: The ammonia gas is heated by the exhaust gas from the ammonia cracking unit (10) through the first heat exchanger (1). A portion of the heated ammonia gas is then sent to the turboshaft engine combustion chamber (5) to burn together with air and cracked gas. The remaining ammonia gas is sent to the second heat exchanger (9) to be heated again by the heat carried by the cracked gas output from the ammonia cracking unit (10). The heated ammonia gas is then sent to the ammonia cracking unit (10) for cracking. After passing through the second heat exchanger (9), a portion of the cracked gas output from the ammonia cracking unit (10) enters the turboshaft engine combustion chamber (5) to burn together with air and ammonia gas. Another portion of the cracked gas enters the hydrogen separation unit (11) for separation and purification. The hydrogen gas discharged from the hydrogen separation unit (11) enters the fuel cell (12) to react with air and generate electricity. The air is compressed in the first stage by the low-pressure compressor (2), and then compressed in the second stage by the high-pressure compressor (4). The compressed air enters the combustion chamber (5) of the turboshaft engine and is burned together with the cracked gas and ammonia. The exhaust gas after combustion enters the turboshaft engine turbine (6) to do work. The turboshaft engine turbine (6) drives the generator (7) to generate electricity. The exhaust gas output by the turboshaft engine turbine (6) enters the ammonia cracking unit (10) to exchange heat with ammonia, and then enters the first heat exchanger (1) to exchange heat with ammonia. The exhaust gas after heat exchange enters the exhaust gas treatment unit (14).

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