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

Abstract

The ammonia hydrogen production gas turbine and ammonia steam turbine coupling power generation system is characterized in that a liquid ammonia storage tank is connected with a conveying pump, an ammonia channel of a first heat exchanger is connected with the conveying pump, and the ammonia channel of the first heat exchanger is connected with an ammonia treatment device and an ammonia gas channel of a second heat exchanger through a three-way node; a reaction channel of the ammonia decomposition reactor is connected with the combustor, the combustor is connected with the gas turbine power generation assembly, and smoke exhausted after power generation sequentially flows through a smoke channel of the ammonia decomposition reactor, the air pressurization assembly and a tail gas channel of the second heat exchanger and then enters the tail gas treatment unit. The air supercharging assembly conveys compressed air to a compressed air channel of the first heat exchanger, and then the compressed air is input into the combustor after being compressed by the gas turbine power generation assembly; the ammonia gas discharged by the second heat exchanger generates power through the ammonia steam turbine power generation assembly, and then is cooled by the cooling device and flows back to the liquid ammonia source; the gas turbine and the steam turbine are well coupled, smoke heat energy is fully utilized to achieve power generation and heat exchange, and the energy efficiency utilization rate is high.

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 being green and low-carbon. Since it does not produce carbon emissions as a fuel, it is the clean energy with the greatest development potential. Ammonia energy, as a hydrogen-rich substance, contains 17.6% hydrogen by mass, making it an ideal carrier of hydrogen. Using ammonia to supply hydrogen and using ammonia to replace hydrogen 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 the tail gas not only causes environmental pollution, but also causes a large amount of heat energy waste. 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 urgently needs to be solved.

[0004] A gas turbine is a power device that generates high-temperature, high-pressure, and high-kinetic energy gas by burning fuel to drive the turbine to do work. At present, power generation or mobile equipment using gas turbines as power sources is developing and applying rapidly. Its main advantage is that it has a better power density. However, in general, the thermal efficiency of gas turbines is often between 30-40%. The gas after the turbine has done work still has a high energy utilization value. It is a reasonable method in principle and practice to couple gas turbines and steam turbines for comprehensive use and use the residual heat of gas to heat steam. However, these two types of equipment usually use different working media, and the superposition of the two machines is bound to have disadvantages in terms of equipment complexity, space requirements, and storage management of different fuels. Therefore, under the current circumstances, how to combine the use of zero-carbon fuels, use gas turbines and steam turbines through a single fuel coupling, improve energy efficiency, and simplify equipment is a technical demand of great significance at present. 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 hydrogen production gas turbine and an ammonia steam turbine coupled power generation system, which adopts a temperature matching design to optimize the utilization 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 and an ammonia steam turbine coupled 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, a tail gas processing 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 respectively connected to the ammonia processing device and the ammonia channel inlet of the second heat exchanger through a three-way node;

[0009] The ammonia processing device comprises an ammonia decomposition reactor and a burner, wherein 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, and the flue gas generated by the burner is transported to the gas turbine power generation component through a pipeline to generate electricity, and the flue gas discharged after power generation 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 in sequence through a pipeline to enter the tail gas treatment unit; the air booster component compresses the inhaled air and transports it to the compressed air channel of the first heat exchanger 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 to be mixed with the hydrogen obtained by decomposition of 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, and 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 of the 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 being drivingly connected to 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 being 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 being connected to the compressed gas inlet of the first compressor through a pipeline, and the compressed gas outlet of the first compressor being 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 inlet of the ammonia cooling channel 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. When the reactor is in 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 whole 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 is designed for temperature matching of each component to optimize the utilization efficiency of thermal energy and kinetic energy. 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 step by step. First, the waste heat of the flue gas after work is used to heat the materials in the ammonia decomposition reactor, which promotes the hydrogen production by ammonia decomposition without the input of additional work heat. 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 gasification of the liquid ammonia. Finally, the flue gas after cooling again is further heated to drive the ammonia gas 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 of 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 until 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 reach the target process requirements. The starting device is then 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 drawings required for use in the specific embodiments will be briefly introduced below. 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 creative work.

[0024] Figure 1 It is a schematic diagram of the connection of 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-three-way 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 gas cylinder. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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 processing device and the ammonia channel 7a inlet of 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 The exhaust gas discharged after power generation then flows through the exhaust gas channel 5b of the ammonia decomposition reactor 5, the air booster component and the exhaust gas channel 7b of the second heat exchanger 7 in sequence through the pipeline and then enters the exhaust gas treatment unit 13; the air booster 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 it is compressed by the gas turbine power generation component and input into the combustion chamber of the burner 6 to be 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 to generate electricity, and then is cooled by the cooling device 16 to obtain 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 gasified 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, wherein the first branch air flow flows to the inlet of the reaction channel 5a of the ammonia decomposition reactor 5, and then is converted into product gas after a decomposition reaction occurs in the reaction channel 5a, 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, wherein the first turbine 11 is drivingly 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, wherein 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 through a pipeline, so as 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 through a pipeline, 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 gas channel 7b of the second heat exchanger 7 through a pipeline.

[0033] The second compressor 8 inhales air of 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, pushing 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 keeps on compressing the air at normal pressure and temperature sucked in 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, pushes its blades and drives its shaft to rotate, and then transmits 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 SCR and other means.

[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 flows into the ammonia compressor 17 after flowing out of the cooling device. After being compressed and liquefied by the ammonia compressor 17, the liquid ammonia flowing out 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, in the reaction channel 5a, the ammonia decomposition reaction catalyst is filled in the reaction channel 5a in the form of a fixed bed layer, and the catalyst temperature in the reaction channel 5a is mainly controlled by heating the flue gas entering the flue gas channel 5b; wherein 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 runs smoothly, the reaction conditions are as follows: the reaction temperature is 350-850°C, preferably 450-580°C; the space velocity of ammonia in the reaction channel 5a is 1000-30000h -1 , preferably 5000~12000h -1 The mass flow rate of ammonia entering the ammonia decomposition reactor 5 can be calculated from the filling amount of the catalyst and the target space velocity; the gas pressure in the reaction channel 5a is between 0.06 and 1.8 MPa; after the ammonia flows through the ammonia decomposition catalyst, it is converted into decomposition products to obtain hydrogen and nitrogen, wherein the conversion rate of ammonia is greater than 98.0%.

[0039] The burner 6 contains an ignition device. Under the appropriate fuel flow rate and air flow rate, after successful ignition and stable operation of the system, the flow rate of compressed air is 1 to 40 times the flow rate of ammonia flowing into the ammonia decomposition reactor; whether the combustion state meets the process conditions is judged by whether the outlet gas temperature of the burner is continuously not less than 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 rate of the two tributaries flowing out of the three-way node 4 is defined by the ratio of the ammonia flow rate flowing to the ammonia decomposition reactor 5 / the ammonia flow rate flowing to the second heat exchanger 7, and the preferred ratio is 1:3 to 3:1.

[0040] like Figure 2 As shown, the present invention further provides a starting device in the system, and the starting device 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 the standby state needs to be changed to a normal operating state, it is necessary to operate the starting device so that the system first reaches the normal operating conditions and then close the starting device. The specific operation method is as follows:

[0041] The air compressor 18 is turned on, and the air compressor 18 provides air to flow into the burner 6. The fuel gas cylinder 19 provides fuel gas to flow into 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 in the ammonia decomposition reactor 5 reaches the process value, the delivery pump 2 is started to make the liquid ammonia flow out from 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 reaches 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 reaches 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 mixed gas containing hydrogen, and a mixture of the above fuel gases.

[0042] The liquid ammonia storage tank 1 used in the present invention can be a storage 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 sucked from the environment by the second compressor 8 are determined by the specific working environment of the equipment. Normal pressure and normal temperature only represent the conditions under common ground environments, not all possible conditions. The descriptions of normal pressure, high pressure, etc. in the present invention are mainly to illustrate the process effect achieved by the equipment, rather than to limit the working conditions.

[0043] In addition, the implementation methods of the heat exchanger and the cooling device 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 heat exchange can be carried out through the wall of the device, thereby achieving energy optimization or obtaining the target process temperature.

[0044] Anything not described in the present invention is applicable to the prior art.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. An ammonia-to-hydrogen gas turbine and an ammonia steam turbine coupled 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 processing 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 respectively 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 to generate electricity. The flue gas discharged after the power generation 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) in sequence through the pipeline and then enters the tail gas treatment unit (13); the air booster 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 then input into the combustion chamber of the burner (6) to mix with the hydrogen obtained 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 component to generate electricity, and then cooled by the cooling device (16) to produce liquid ammonia. The obtained liquid ammonia is transported to the liquid ammonia source 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 also 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 turned off.

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 a mixture of several 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 gas turbine power generation assembly comprises a first generator (12) and a first compressor (10) and a first turbine (11) arranged coaxially, wherein the first turbine (11) forms a coaxial driving connection with the rotor of the first generator (12); the air boost assembly comprises a second compressor (8) and a second turbine (9) arranged coaxially, wherein the compressed air outlet of the second compressor (8) is connected to the inlet of the compressed air passage (3b) of the first heat exchanger (3) through a pipeline for heat exchange with the ammonia passage (3a) of the first heat exchanger (3), and the compressed air passage (3b) outlet of the first heat exchanger (3) is connected to the inlet of the compressed air passage (3b) 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 gas channel (7b) of the second heat exchanger (7) through a pipeline.

6. The ammonia-to-hydrogen gas turbine and ammonia steam turbine coupled power generation system according to claim 5, characterized in that: The ammonia steam turbine power generation assembly comprises 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; the third turbine (14) is coaxially driven with the rotor of the second generator (15).

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

8. The ammonia-to-hydrogen gas turbine and ammonia steam turbine coupled power generation system according to any one of claims 2 to 7, 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.

9. 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. When the ammonia decomposition reactor (5) is in 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.

10. The ammonia-to-hydrogen gas turbine and ammonia steam turbine coupled power generation system according to claim 9, 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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