Ammonia-hydrogen gas turbine and ammonia steam turbine coupled power generation system

Abstract

The present invention discloses an ammonia hydrogen production gas turbine and an ammonia steam turbine coupled power generation system, wherein the liquid ammonia storage tank is connected to a delivery pump, the ammonia channel of a first heat exchanger is connected to the delivery pump, and the ammonia channel of the first heat exchanger is respectively connected to an ammonia treatment device and an ammonia channel of a second heat exchanger through a three-way node; the reaction channel of an ammonia decomposition reactor is connected to a burner, and the burner is connected to a gas turbine power generation component, and the flue gas exhausted after power generation flows through the flue gas channel of the ammonia decomposition reactor, an air boosting component, and an exhaust gas channel of the second heat exchanger in sequence before entering an exhaust gas treatment unit; the air boosting component delivers the compressed air to the compressed gas channel of the first heat exchanger, which is then compressed by the gas turbine power generation component and input into the burner; the ammonia exhausted from the second heat exchanger is generated by the ammonia steam turbine power generation component, and then cooled by a cooling device and flows back to the liquid ammonia source; the present invention well couples the gas turbine and the steam turbine, fully utilizes the heat energy of the flue gas to achieve power generation and heat exchange, and has high energy efficiency utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of generators or engines, and in particular to a power generation system coupled with an ammonia-to-hydrogen gas turbine and an ammonia steam turbine. Background Art

[0002] Hydrogen energy has the characteristics of abundant sources, high energy density, and green and low-carbon. Since it does not produce carbon emissions as a fuel, it is the clean energy with the most development potential. Ammonia energy, as a hydrogen-rich substance, contains 17.6% hydrogen by mass and is an ideal carrier of hydrogen. Using ammonia to supply hydrogen and replacing hydrogen with ammonia has become one of the development trends of hydrogen energy.

[0003] When ammonia is burned to produce hydrogen to generate electricity, ammonia is difficult to burn completely and produces tail gas containing nitrogen oxides. The direct emission of this tail gas not only causes environmental pollution, but also wastes a lot of heat energy. The utilization rate of ammonia combustion energy is not high, and the system for using ammonia energy to generate electricity is complex. Therefore, how to combine tail gas to improve the comprehensive energy efficiency of ammonia power generation is a key technical problem that needs to be solved urgently.

[0004] A gas turbine is a power plant that generates high-temperature, high-pressure, and high-kinetic-energy gas by burning fuel, which then propels a turbine to produce work. Currently, gas turbines are rapidly developing and being used in power generation and mobile equipment. Their primary advantage lies in their superior power density. However, the thermal efficiency of gas turbines typically ranges from 30% to 40%. The gas remaining after the turbine has produced work still has a high energy value. Coupling a gas turbine with a steam turbine, utilizing the residual heat from the gas to heat the steam, is a rational approach both in principle and in practice. However, these two types of equipment typically use different working fluids, and combining them inevitably presents disadvantages in terms of equipment complexity, space requirements, and the storage and management of different fuels. Therefore, in the current landscape, the question of how to combine a gas turbine with a steam turbine using a single fuel, combined with the use of zero-carbon fuels, to improve energy efficiency and simplify equipment, is a crucial technical need. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems and overcome the technical problem of low comprehensive energy efficiency of ammonia energy in the prior art, the present invention provides an ammonia-to-hydrogen gas turbine and an ammonia steam turbine coupled power generation system, which adopts a temperature matching design to optimize the utilization rate of thermal energy and kinetic energy, and combines the energy efficiency utilization of exhaust gas to make the comprehensive energy efficiency of ammonia energy reach 80-85%.

[0006] The technical solutions adopted are as follows:

[0007] An ammonia-to-hydrogen gas turbine coupled with an ammonia steam turbine power generation system, the system comprising: a liquid ammonia source, a first heat exchanger, an ammonia processing device, a gas turbine power generation component, an air boost component, a second heat exchanger, an ammonia steam turbine power generation component, an exhaust gas treatment unit, and a cooling device;

[0008] The liquid ammonia source includes a liquid ammonia storage tank and a delivery pump, the ammonia channel inlet of the first heat exchanger is connected to the outlet of the delivery pump, and the ammonia channel outlet of the first heat exchanger is connected to the ammonia processing device and the ammonia channel inlet of the second heat exchanger respectively through a three-way node;

[0009] The ammonia processing device includes an ammonia decomposition reactor and a burner. The reaction channel inlet of the ammonia decomposition reactor is connected to the three-way node, and the reaction channel outlet of the ammonia decomposition reactor is connected to the burner. The flue gas generated by the burner is transported to the gas turbine power generation component through a pipeline to generate electricity. The flue gas discharged after power generation then flows through the flue gas channel of the ammonia decomposition reactor, the air booster component, and the tail gas channel of the second heat exchanger through a pipeline in sequence before entering the tail gas treatment unit. The air booster component compresses the inhaled air and transports it to the compressed gas channel of the first heat exchanger for heat exchange. The air is then compressed by the gas turbine power generation component and input into the combustion chamber of the burner to mix with the hydrogen generated by decomposition in the ammonia decomposition reactor.

[0010] The ammonia gas discharged from the ammonia channel outlet of the second heat exchanger is passed through the ammonia steam turbine power generation component to generate electricity, and then cooled by the cooling device to produce liquid ammonia. The obtained liquid ammonia is transported to the liquid ammonia source through a pipeline.

[0011] Furthermore, the system is also provided with a starting device, which includes an air compressor and a fuel gas cylinder, which are respectively connected to the combustion chamber of the burner through pipelines.

[0012] Furthermore, when the starting device is in operation, the compressed air provided by the air compressor and the fuel gas provided by the fuel gas cylinder are simultaneously input into the burner. When the outlet temperature of the combustion chamber of the burner reaches the target process value, the gas turbine power generation component is driven to operate; when the reaction channel temperature of the ammonia decomposition reactor reaches the process value, the delivery pump is started; when it is detected that the outlet air flow rate of the first compressor reaches the process value, the air compressor is shut down; when it is detected that the product air flow flowing out of the ammonia decomposition reactor reaches the process value, the fuel gas cylinder is shut down.

[0013] Preferably, the fuel gas in the fuel gas cylinder includes: natural gas, liquefied petroleum gas, methane, ethane, propane, butane, ammonia, hydrogen and a mixture of one or more fuel gases containing hydrogen.

[0014] Further preferably, the gas turbine power generation assembly includes a first generator and a coaxially arranged first compressor and a first turbine, the first turbine forming a driving connection with the rotor of the first generator; the air boost assembly includes a coaxially arranged second compressor and a second turbine, the compressed gas outlet of the second compressor is connected to the compressed gas channel inlet of the first heat exchanger through a pipeline, for exchanging heat with the ammonia channel of the first heat exchanger, the compressed gas channel outlet of the first heat exchanger is connected to the compressed gas inlet of the first compressor through a pipeline, and the compressed gas outlet of the first compressor is connected to the combustion chamber of the burner through a pipeline; the flue gas outlet of the burner is connected to the inlet of the first turbine through a pipeline, the outlet of the first turbine is connected to the flue gas channel inlet of the ammonia decomposition reactor through a pipeline, the flue gas channel outlet of the ammonia decomposition reactor is connected to the inlet of the second turbine through a pipeline, and the outlet of the second turbine is connected to the exhaust gas channel inlet of the second heat exchanger through a pipeline.

[0015] Preferably, the ammonia steam turbine power generation assembly includes a second generator and a third turbine, the ammonia channel outlet of the second heat exchanger is connected to the inlet of the third turbine through a pipeline, the outlet of the third turbine is connected to the ammonia cooling channel inlet of the cooling device through a pipeline, and the third turbine forms a driving connection with the rotor of the second generator.

[0016] Preferably, a compression ratio of the second compressor to the first compressor is 1.5-15.

[0017] Preferably, the ratio of the ammonia flow rate flowing to the ammonia decomposition reactor to the ammonia flow rate flowing to the second heat exchanger is controlled by the three-way node to be 1:3 to 3:1.

[0018] Preferably, the reaction channel of the ammonia decomposition reactor is filled with an iron-based catalyst and / or a ruthenium-based catalyst. During normal operation, the ammonia decomposition reaction temperature in the ammonia decomposition reactor is 350-850°C, and the ammonia space velocity is 1000-30000h -1 , the gas pressure in the reaction channel is between 0.06 and 1.8 MPa.

[0019] More preferably, the ammonia decomposition reaction temperature is 450-580°C, and the ammonia space velocity is 5000-12000h -1 The gas temperature at the combustion chamber outlet of the burner is ≥750℃.

[0020] The technical solution of the present invention has the following advantages:

[0021] A. The steam turbine and gas turbine of the entire system of the present invention only use a single ammonia fuel. The system is coupled with the hydrogen production reaction in the ammonia decomposition reactor to drive the gas turbine, which greatly simplifies the complexity of the system. The system of the present invention optimizes the utilization efficiency of thermal energy and kinetic energy by designing the temperature matching of each component. The heat generated by the burner causes the flue gas and the surrounding gas to expand and drive the turbine to rotate. The heat of the flue gas in the burner is utilized three times in a step-by-step manner. First, the waste heat of the flue gas after work is used to heat the materials in the ammonia decomposition reactor, promoting the hydrogen production by ammonia decomposition without the input of additional work heat. Secondly, the kinetic energy of the flue gas after cooling drives the operation of another turbine. The principle of turbocharging is used to increase the ambient air, saving the energy consumption of the high-pressure compressor. At the same time, the heated air generated by the turbocharging heats the liquid ammonia through heat exchange, providing energy for the vaporization of the liquid ammonia. Finally, the flue gas after cooling again is further heated to drive the ammonia flow of the ammonia steam turbine power generation component. It has a high comprehensive energy efficiency, and the efficiency of power generation can reach 50-70%. If combined with the energy efficiency utilization of the exhaust gas, it can further reach 80-85%.

[0022] B. The system of the present invention also provides a starting device. When the system is in a stopped state and needs to be cold-started, or when the standby state needs to be changed to a normal operating state, the entire system is started using an air compressor and a fuel gas cylinder. When the burner outlet gas temperature, the reaction channel temperature and reaction product flow rate of the ammonia decomposition reactor, and the first compressor outlet flow rate all meet the target process requirements, the starting device is closed to achieve independent operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention, the following will briefly introduce the drawings required for use in the specific embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of the connection between the ammonia-to-hydrogen gas turbine and the ammonia steam turbine coupled power generation system provided by the present invention;

[0025] Figure 2 It is a schematic diagram of the connection between the ammonia-to-hydrogen gas turbine including the starting device and the ammonia steam turbine coupled power generation system provided by the present invention.

[0026] The meanings of the symbols in the figure are as follows:

[0027] 1-Liquid ammonia storage tank; 2-Transfer pump; 3-First heat exchanger, 3a-Ammonia channel, 3b-Compressed gas channel; 4-Tee node; 5-Ammonia decomposition reactor, 5a-Reaction channel, 5b-Flue gas channel; 6-Burner; 7-Second heat exchanger, 7a-Ammonia channel, 7b-Exhaust gas channel; 8-Second compressor; 9-Second turbine; 10-First compressor; 11-First turbine; 12-First generator; 13-Exhaust gas treatment unit; 14-Third turbine; 15. Second generator; 16. Cooling device, 16a-Ammonia cooling channel, 16b-Coolant channel; 17-Ammonia compressor; 18-Air compressor; 19-Fuel cylinder. DETAILED DESCRIPTION

[0028] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings. It is obvious that the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0029] “Gas space velocity” is a commonly used technical term in fixed bed reactor technology. It refers to the volume of gas flowing through a unit volume of catalyst per unit time under standard conditions. Its unit is usually h -1 .

[0030] like Figure 1As shown, the present invention provides an ammonia hydrogen production gas turbine and an ammonia steam turbine coupled power generation system, comprising: a liquid ammonia source, a first heat exchanger 3, an ammonia processing device, a gas turbine power generation component, an air boost component, a second heat exchanger 7, an ammonia steam turbine power generation component, an exhaust gas treatment unit 13 and a cooling device 16; the liquid ammonia source comprises a liquid ammonia storage tank 1 and a delivery pump 2, the ammonia channel 3a inlet of the first heat exchanger 3 is connected to the delivery pump 2 outlet, the ammonia channel 3a outlet of the first heat exchanger 3 is connected to the ammonia channel 7a inlet of the ammonia processing device and the second heat exchanger 7 through a three-way node 4 respectively; the ammonia processing device comprises an ammonia decomposition reactor 5 and a burner 6, the ammonia decomposition reactor 5 comprises a reaction channel 5a and a flue gas channel 5b, the reaction channel 5a inlet is connected to the three-way node 4, and the reaction channel 5a outlet is connected to the flue gas channel 7a of the second heat exchanger 7. The outlet is connected to the burner 6, and the flue gas generated by the burner 6 is transported to the gas turbine power generation component through a pipeline for power generation. The flue gas discharged after power generation then flows through the flue gas channel 5b of the ammonia decomposition reactor 5, the air booster component and the tail gas channel 7b of the second heat exchanger 7 through a pipeline in sequence, and then enters the tail gas treatment unit 13; the air booster component compresses the inhaled air and transports it to the compressed gas channel 3b of the first heat exchanger 3 for heat exchange, and then it is compressed by the gas turbine power generation component and input into the combustion chamber of the burner 6, and mixed with the hydrogen obtained by decomposition in the ammonia decomposition reactor 5; the ammonia discharged from the outlet of the ammonia channel 7a of the second heat exchanger 7 passes through the ammonia steam turbine power generation component for power generation, and then is cooled by the cooling device 16 to produce liquid ammonia, and the obtained liquid ammonia is transported to the liquid ammonia source through a pipeline.

[0031] Specifically, the liquid ammonia delivery pump 2 is connected to the liquid ammonia storage tank 1 of the liquid ammonia source, and the liquid ammonia therein is delivered to the inlet of the ammonia channel 3a of the first heat exchanger 3 through the delivery pump at a certain flow rate, and flows out from the outlet of the ammonia channel 3a; the ammonia in the ammonia channel 3a is heated by the material in the compressed gas channel 3b of the first heat exchanger 3, and is completely vaporized into gaseous ammonia at the outlet of the ammonia channel 3a; the gaseous ammonia is divided into two air flows at the three-way node 4, of which the first branch air flow flows to the inlet of the reaction channel 5a of the ammonia decomposition reactor 5, and then undergoes a decomposition reaction in the reaction channel 5a to be converted into product gas, and flows to the fuel gas inlet of the burner 6.

[0032] The gas turbine power generation assembly includes a first generator 12 and a coaxially arranged first compressor 10 and a first turbine 11. The first turbine 11 is drivenly connected to the rotor of the first generator 12. The air boost assembly includes a coaxially arranged second compressor 8 and a second turbine 9. The compressed gas outlet of the second compressor 8 is connected to the inlet of the compressed gas channel 3b of the first heat exchanger 3 via a pipeline, which is used to exchange heat with the ammonia channel 3a of the first heat exchanger 3. The compressed gas channel 3b outlet of the first heat exchanger 3 is connected to the compressed gas inlet of the first compressor 10 via a pipeline. The compressed gas outlet of the first compressor 10 is connected to the combustion chamber of the burner 6 via a pipeline. The flue gas outlet of the burner 6 is connected to the inlet of the first turbine 11 via a pipeline. The outlet of the first turbine 11 is connected to the inlet of the flue gas channel 5b of the ammonia decomposition reactor 5 via a pipeline. The outlet of the flue gas channel 5b of the ammonia decomposition reactor 5 is connected to the inlet of the second turbine 9 via a pipeline. The outlet of the second turbine 9 is connected to the inlet of the exhaust channel 7b of the second heat exchanger 7 via a pipeline.

[0033] The second compressor 8 inhales air at normal pressure and temperature from the environment, and outputs high-pressure gas (pressure is p1) at its outlet, and its temperature will also be increased compared to normal temperature. The airflow with a pressure of p1 passes through the compressed air channel 3b of the first heat exchanger 3, flows into the inlet of the first compressor 10 after cooling, and outputs high-pressure gas (gas pressure is p2, where p2>p1) at its outlet, and then flows into the compressed air inlet of the burner 6; the compressed air flowing into the burner 6 and the product gas at the outlet of the ammonia decomposition reactor 5 are used as fuel, and the two are mixed and burned. The combustion product flue gas flows out from the flue gas outlet of the burner 6 and flows into the first turbine 11. The flue gas flow drives the blades of the first turbine 11 to rotate, driving its turbine shaft and the rotating shaft of the first compressor 10 to rotate together, and then transmits the kinetic energy of the rotation to the rotor of the first generator 12 to generate electricity. The flue gas flowing out of the first turbine 11 flows into the inlet of the flue gas channel 5b of the ammonia decomposition reactor 5, heating the material inside the reaction channel 5a. The flue gas flows out from the outlet of its flue gas channel 5b and is introduced into the blades of the second turbine 9, driving the blades to rotate, driving its turbine shaft and the rotating shaft of the second compressor 8 to rotate together, so that the second compressor 8 continues to compress the air at normal pressure and temperature sucked from the environment.

[0034] The ammonia steam turbine power generation assembly provided by the present invention includes a second generator 15 and a third turbine 14. The outlet of the ammonia channel 7a of the second heat exchanger 7 is connected to the inlet of the third turbine 14 through a pipeline, and the outlet of the third turbine 14 is connected to the inlet of the ammonia cooling channel 16a of the cooling device 16 through a pipeline. The third turbine 14 forms a driving connection with the rotor of the second generator 15.

[0035] The second branch airflow branched off from the three-way node 4 flows into the inlet of the ammonia channel 7a of the second heat exchanger 7 and flows out from its outlet; in the ammonia channel 7a of the second heat exchanger 7, the ammonia flow is heated by the gas material in the exhaust channel 7b from the second heat exchanger 7, and the temperature, volume and flow rate are further increased. The ammonia flow flows into the inlet of the third turbine 14, pushing its blades and driving its shaft to rotate, and then transmitting the kinetic energy of rotation to the rotor of the second generator 15 to generate electricity; the gas material in the exhaust channel 7b flows out from the outlet of the exhaust channel 7b and flows into the exhaust treatment unit 13 for further treatment or heat recovery. The exhaust gas contains substandard emissions, such as NOx, which can be further treated by means such as SCR.

[0036] The ammonia gas flowing out of the third turbine 14 is cooled by the ammonia cooling channel 16a of the cooling device 16, and then flows into the ammonia compressor 17 after flowing out of the cooling device. After being compressed and liquefied by the ammonia compressor 17, the flowing liquid ammonia is refluxed and merged into the liquid ammonia storage tank 1; the coolant used in the coolant channel 16b includes but is not limited to air, water, salt water solution, antifreeze, ammonia gas, liquid ammonia, etc.

[0037] The process conditions of the system of the present invention in a continuous working state are as follows:

[0038] The ammonia decomposition reactor 5 adopts a fixed-bed reactor technology route, that is, the ammonia decomposition reaction catalyst is filled in the reaction channel 5a in the form of a fixed bed layer. The catalyst temperature in the reaction channel 5a is mainly controlled by heating the flue gas entering the flue gas channel 5b. The ammonia decomposition reaction catalyst is preferably an iron-based catalyst or a ruthenium-based catalyst, or a mixture of the two types of catalysts. After the ammonia decomposition reactor 5 is running smoothly, the reaction conditions are as follows: the reaction temperature is 350-850°C, preferably 450-580°C; the ammonia space velocity in the reaction channel 5a is 1000-30000h / min. -1 , preferably 5000~12000h -1 The mass flow rate of ammonia entering the ammonia decomposition reactor 5 can be calculated based on the catalyst loading and the target space velocity. The gas pressure in the reaction channel 5a is between 0.06 and 1.8 MPa. After flowing through the ammonia decomposition catalyst, the ammonia is converted into decomposition products to obtain hydrogen and nitrogen, wherein the conversion rate of ammonia is greater than 98.0%.

[0039] Burner 6 includes an ignition device. Under appropriate fuel and air flow rates, after successful ignition and stable system operation, the compressed air flow rate is 1 to 40 times the ammonia flow rate entering the ammonia decomposition reactor. Whether the combustion state meets process conditions is determined by whether the burner outlet gas temperature remains at or above 750°C. The compression ratio of the second compressor 8 to the first compressor 10 is between 1.5 and 15. The ratio of the ammonia mass flow rates of the two branches flowing out of the three-way node 4 is defined as the ratio of the ammonia flow rate flowing to the ammonia decomposition reactor 5 to the ammonia flow rate flowing to the second heat exchanger 7, with a preferred ratio of 1:3 to 3:1.

[0040] like Figure 2 As shown, the present invention further provides a starting device in the system, which includes an air compressor 18 and a fuel gas cylinder 19, which are respectively connected to the combustion chamber of the burner 6 through pipelines. When the system is in a stopped state and needs to be cold-started, or when the standby state needs to be changed to normal operation, it is necessary to operate the starting device to allow the system to reach normal operating conditions before closing the starting device. The specific operation method is as follows:

[0041] The air compressor 18 is turned on to provide air to the burner 6, and the fuel gas cylinder 19 provides fuel gas to the burner 6 for combustion. After the outlet gas temperature of the burner reaches the target process value, the second turbine 9 and the first turbine 11 start to rotate. When the temperature in the reaction channel 5a of the ammonia decomposition reactor 5 reaches the process value, the delivery pump 2 is started to allow liquid ammonia to flow out of the liquid ammonia storage tank 1 and further flow to the ammonia decomposition reactor 5. When it is detected that the outlet air flow rate of the first compressor 10 has reached the process value, the air compressor 18 is turned off or disconnected from the system. When it is detected that the product gas flow flowing out of the reaction channel 5a has reached the process value, the fuel gas cylinder 19 is turned off or disconnected from the system. Thereafter, the system can maintain continuous operation, and the first generator 12 and the second generator 15 can continuously output electrical energy. The fuel in the fuel gas cylinder 19 includes but is not limited to natural gas, liquefied petroleum gas, methane, ethane, propane, butane, ammonia, hydrogen or a mixture containing hydrogen, as well as a mixture of the above fuel gases.

[0042] The liquid ammonia storage tank 1 used in the present invention can be a single tank or a combination of two or more tanks. It should be noted that the specific values ​​of the temperature and pressure of the gas drawn from the environment by the second compressor 8 are determined by the specific operating environment of the equipment. Normal pressure and temperature represent only common conditions on the ground and do not represent all possible conditions. Descriptors such as normal pressure and high pressure are used in this invention primarily to illustrate the process effects achieved by the equipment, and do not limit operating conditions.

[0043] In addition, the implementation methods of heat exchangers and cooling devices are flexible and diverse. They all have two channels, each channel has one or more inlets and one or more outlets. The fluid materials in the two channels are not connected to each other, but can exchange heat through the wall of the device, thereby achieving energy optimization or obtaining the target process temperature.

[0044] Any matters not described in the present invention are applicable to the prior art.

[0045] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An ammonia-to-hydrogen gas turbine coupled with an ammonia steam turbine power generation system, characterized in that: The system comprises: a liquid ammonia source, a first heat exchanger (3), an ammonia processing device, a gas turbine power generation component, an air boost component, a second heat exchanger (7), an ammonia steam turbine power generation component, a tail gas treatment unit (13) and a cooling device (16); The liquid ammonia source comprises a liquid ammonia storage tank (1) and a delivery pump (2); the inlet of the ammonia channel (3a) of the first heat exchanger (3) is connected to the outlet of the delivery pump (2); the outlet of the ammonia channel (3a) of the first heat exchanger (3) is connected to the inlet of the ammonia treatment device and the ammonia channel (7a) of the second heat exchanger (7) through a three-way node (4); The ammonia treatment device comprises an ammonia decomposition reactor (5) and a burner (6), wherein the reaction channel inlet of the ammonia decomposition reactor (5) is connected to the three-way node (4), and the reaction channel (5a) outlet of the ammonia decomposition reactor (5) is connected to the burner (6). The flue gas generated by the burner (6) is transported to the gas turbine power generation component through a pipeline for power generation. The flue gas discharged after power generation then flows through the flue gas channel (5b) of the ammonia decomposition reactor (5), the air boosting component and the tail gas channel (7b) of the second heat exchanger (7) through a pipeline in sequence before entering the tail gas treatment unit (13); the air boosting component compresses the inhaled air and transports it to the compressed air channel (3b) of the first heat exchanger (3) for heat exchange, and then the air is compressed by the gas turbine power generation component and input into the combustion chamber of the burner (6) to mix with the hydrogen generated by decomposition of the ammonia decomposition reactor (5); Ammonia gas discharged from the outlet of the ammonia channel (7a) of the second heat exchanger (7) is passed through the ammonia steam turbine power generation assembly to generate electricity, and then cooled by the cooling device (16) to produce liquid ammonia, and the obtained liquid ammonia is transported to the liquid ammonia source through a pipeline; The gas turbine power generation assembly comprises a first generator (12) and a coaxially arranged first compressor (10) and a first turbine (11), wherein the first turbine (11) forms a coaxial driving connection with the rotor of the first generator (12); the air boost assembly comprises a coaxially arranged second compressor (8) and a second turbine (9), wherein the compressed gas outlet of the second compressor (8) is connected to the compressed gas channel (3b) inlet of the first heat exchanger (3) through a pipeline for heat exchange with the ammonia channel (3a) of the first heat exchanger (3), and the compressed gas channel (3b) outlet of the first heat exchanger (3) is connected to the ammonia channel (3a) of the first heat exchanger (3) through a pipeline. The compressed gas inlet of the first compressor (10) is connected, and the compressed gas outlet of the first compressor (10) is connected to the combustion chamber of the burner (6) through a pipeline; the flue gas outlet of the burner (6) is connected to the inlet of the first turbine (11) through a pipeline, the outlet of the first turbine (11) is connected to the inlet of the flue gas channel (5b) of the ammonia decomposition reactor (5) through a pipeline, the outlet of the flue gas channel (5b) of the ammonia decomposition reactor (5) is connected to the inlet of the second turbine (9) through a pipeline, and the outlet of the second turbine (9) is connected to the inlet of the exhaust channel (7b) of the second heat exchanger (7) through a pipeline.

2. The ammonia-to-hydrogen gas turbine and ammonia steam turbine coupled power generation system according to claim 1, characterized in that: The system is further provided with a starting device, which comprises an air compressor (18) and a fuel gas cylinder (19), which are respectively connected to the combustion chamber of the burner (6) through pipelines.

3. The ammonia-to-hydrogen gas turbine and ammonia steam turbine coupled power generation system according to claim 2, characterized in that: When the starting device is in operation, the compressed air provided by the air compressor (18) and the fuel gas provided by the fuel gas cylinder (19) are simultaneously input into the burner (6), and when the combustion chamber outlet temperature of the burner (6) reaches a target process value, the gas turbine power generation assembly is driven to operate; When the temperature of the reaction channel (5a) of the ammonia decomposition reactor (5) reaches the process value, the delivery pump (2) is started; when it is detected that the outlet air flow rate of the first compressor (10) reaches the process value, the air compressor (18) is turned off; when it is detected that the product air flow flowing out of the ammonia decomposition reactor (5) reaches the process value, the fuel gas cylinder (19) is closed.

4. The ammonia-to-hydrogen gas turbine and ammonia steam turbine coupled power generation system according to claim 2, characterized in that: The fuel gas in the fuel gas cylinder (19) includes one or more fuel gases selected from natural gas, liquefied petroleum gas, methane, ethane, propane, butane, ammonia, hydrogen and hydrogen-containing mixed gas.

5. The ammonia-to-hydrogen gas turbine and ammonia steam turbine coupled power generation system according to claim 1, characterized in that: The ammonia steam turbine power generation assembly includes a second generator (15) and a third turbine (14), the outlet of the ammonia channel (7a) of the second heat exchanger (7) is connected to the inlet of the third turbine (14) through a pipeline, the outlet of the third turbine (14) is connected to the inlet of the ammonia cooling channel (16a) of the cooling device (16) through a pipeline, and the third turbine (14) forms a coaxial drive connection with the rotor of the second generator (15).

6. The ammonia-to-hydrogen gas turbine and ammonia steam turbine coupled power generation system according to claim 5, characterized in that: The compression ratio of the second compressor (8) to the first compressor (10) is 1.5-15.

7. The ammonia-to-hydrogen gas turbine and ammonia steam turbine coupled power generation system according to any one of claims 2 to 6, characterized in that: The ratio of the ammonia flow rate flowing to the ammonia decomposition reactor (5) to the ammonia flow rate flowing to the second heat exchanger (7) is controlled by the three-way node (4) to be 1:3 to 3:

1.

8. The ammonia-to-hydrogen gas turbine and ammonia steam turbine coupled power generation system according to claim 1, characterized in that: The reaction channel (5a) of the ammonia decomposition reactor (5) is filled with an iron-based catalyst and / or a ruthenium-based catalyst. During normal operation, the ammonia decomposition reaction temperature in the ammonia decomposition reactor (5) is 350-850°C, and the ammonia space velocity is 1000-30000h / min. -1 , the gas pressure in the reaction channel is between 0.06 and 1.8 MPa.

9. The ammonia-to-hydrogen gas turbine and ammonia steam turbine coupled power generation system according to claim 8, characterized in that: The ammonia decomposition reaction temperature is 450-580°C, and the ammonia space velocity is 5000-12000h -1 The gas temperature at the combustion chamber outlet of the burner (6) is ≥750°C.

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