Ammonia fuel cracking supply system of gas turbine

Abstract

The invention provides an ammonia fuel cracking supply system of a gas turbine. The system comprises a liquid ammonia storage tank, a liquid ammonia supply pump, an air vaporizer, a heat exchanger, a first ammonia cracker, a compression and expansion all-in-one machine, the gas turbine and the like. Wherein liquid ammonia is supplied to the air vaporizer through the liquid ammonia supply pump; one end of the heat exchanger is communicated with the air vaporizer, and the other end is communicated with the first ammonia cracker; one end of a compression-expansion all-in-one machine introduced by the system is communicated with the heat exchanger, and the other end is communicated with the gas turbine. The air vaporizer adopts an exhaust heat source to gasify liquid ammonia into ammonia gas. Ammonia gas discharged from the air vaporizer enters the heat exchanger, exchanges heat with cracked gas after cracking to be heated, and then is guided into the first ammonia cracker. Ammonia gas is decomposed into mixed gas of hydrogen and nitrogen in the first ammonia cracker, the mixed gas can enter the heat exchanger, and the mixed gas enters the compression and expansion all-in-one machine after being subjected to heat exchange and cooling in the heat exchanger, and is conveyed to the gas turbine after being pressurized and cooled.

Description

Technical Field

[0001] The present invention relates to the field of gas turbines, and in particular to an ammonia gas turbine fuel supply system. Background Art

[0002] In a gas turbine using ammonia as fuel, ammonia is usually pre-cracked to generate a mixed gas of hydrogen, nitrogen and residual ammonia, which is then sent to the combustion chamber for combustion. At present, most technical solutions use a separate heat source to heat and crack ammonia, which not only increases the complexity of the system, but also leads to low energy utilization and fails to fully utilize the high temperature of the gas turbine exhaust. At the same time, the high-temperature and high-pressure gas generated after ammonia cracking poses a severe challenge to the fuel supply system, seriously affecting the efficiency of the system and the service life of the instrument.

[0003] The exhaust temperature of heavy-duty gas turbines is as high as 500-600°C, which is a high-quality heat source. By selecting a suitable catalyst, ammonia can be almost completely cracked under the condition of atmospheric gas turbine exhaust temperature. Therefore, the heat exchanger can be used to fully utilize this part of the heat to crack the ammonia. However, the fuel supply pressure of heavy-duty gas turbines is usually around 30 bar, so after the ammonia is cracked under atmospheric pressure. But the cracked gas temperature after ammonia cracking is relatively high, usually between 500 and 600°C, while the maximum temperature limit of the fuel of the gas turbine is about 200°C. If the cracked gas is directly supplied to the gas turbine combustion chamber, it may cause the combustion chamber to flash back, and the existing fuel supply system cannot meet this requirement. If the method of directly cooling the cracked gas is adopted, the overall efficiency of the gas turbine system will be reduced.

[0004] In view of the above technical problems, the present invention is specially introduced. Summary of the invention

[0005] The main purpose of the present invention is to provide a gas turbine ammonia fuel cracking supply system, which utilizes the high-temperature waste heat of the gas turbine exhaust to achieve efficient cracking of ammonia and improve energy utilization efficiency.

[0006] In order to achieve the above object, the present invention provides a gas turbine ammonia fuel cracking supply system, the system uses the exhaust heat source of the gas turbine to crack ammonia under normal pressure environment, and the system includes:

[0007] Liquid ammonia storage tank, liquid ammonia supply pump and air vaporizer. The liquid ammonia storage tank stores liquid ammonia. Liquid ammonia is supplied to the air vaporizer through the liquid ammonia supply pump. The air vaporizer uses exhaust heat source to gasify the liquid ammonia into ammonia gas.

[0008] A heat exchanger and a first ammonia cracker, wherein one end of the heat exchanger is connected to the air vaporizer and the other end is connected to the first ammonia cracker. The first ammonia cracker is arranged in the exhaust passage of the gas turbine. The heat exchanger receives ammonia from the air vaporizer and introduces the ammonia after heat exchange into the first ammonia cracker. The ammonia is decomposed into a mixed gas of hydrogen and nitrogen in the first ammonia cracker, and the mixed gas enters the heat exchanger;

[0009] A compression-expansion integrated machine, the compression-expansion integrated machine is connected to the heat exchanger, and the compression-expansion integrated machine receives the mixed gas cooled by the heat exchanger to pressurize and cool the mixed gas;

[0010] The gas turbine is connected to the compressor and expander and receives the mixed gas processed by the compressor and expander. The system effectively pressurizes and cools the ammonia cracking gas by introducing the compressor and expander and heat exchanger, and realizes the pressurization and cooling of the fuel gas with lower energy consumption, so that it meets the temperature and pressure conditions required for the gas turbine fuel supply, thereby improving the overall efficiency of the system.

[0011] The following is a further optimization of the above scheme by the present invention:

[0012] Furthermore, the system also includes a cooler, which is connected to the liquid ammonia supply pump. The liquid ammonia at the outlet of the liquid ammonia supply pump is divided into two paths, one path enters the air vaporizer to absorb the heat in the ambient air and evaporate to form ammonia gas; the other path enters the cooler to serve as a refrigerant for the cooler. The cooler does not need to provide cooling water separately, and can effectively preheat the original ammonia gas, which can improve the thermal efficiency of the system.

[0013] Furthermore, the system also includes a second ammonia cracker, one end of the second ammonia cracker is connected to the first ammonia cracker, and the other end is connected to the heat exchanger; the mixed gas at the outlet of the first ammonia cracker is divided into two paths, one path enters the heat exchanger, and the other path enters the second ammonia cracker for further cracking and then enters the heat exchanger.

[0014] Furthermore, the integrated compression and expansion machine includes a first-stage compressor, a second-stage compressor and an expander. The first-stage compressor receives the mixed gas from the heat exchanger. The mixed gas is pressurized by the first-stage compressor and enters the cooler for cooling. Then, it enters the second-stage compressor for pressurization, and then enters the cooler for cooling. Finally, it enters the expander for further cooling.

[0015] Furthermore, the system also includes a hydrogen separator. At the outlet of the expander, the mixed gas is divided into two paths: one path enters the combustion chamber of the gas turbine through the fuel control valve; the other path passes through the hydrogen separator to separate hydrogen from the mixed gas.

[0016] Furthermore, the system also includes a supplementary combustion burner and a pressure reducing valve. One end of the hydrogen separator is connected to the supplementary combustion burner, and the other end is connected to the pressure reducing valve.

[0017] Furthermore, the hydrogen separator contains a hydrogen molecular sieve, and the hydrogen separated by the hydrogen molecular sieve enters the supplementary combustion burner; the gas that does not pass through the hydrogen molecular sieve is reduced in pressure by a pressure reducing valve and then flows into the ammonia path of the first ammonia cracker for a continuous cracking process.

[0018] Furthermore, the system also includes a variable frequency blower, which is connected to the supplementary combustion burner to provide air for the supplementary combustion burner. The air delivered by the variable frequency blower and the hydrogen separated from the hydrogen separator are mixed and burned to produce high-temperature flue gas.

[0019] Furthermore, at the outlet of the supplementary combustion burner, the high-temperature flue gas enters the second ammonia cracker to provide high temperature for the second ammonia cracker, and then is discharged from the second ammonia cracker and merged into the exhaust channel of the gas turbine before the first ammonia cracker.

[0020] Furthermore, the system also includes a chimney, which is connected to the first ammonia cracker to discharge high-temperature flue gas.

[0021] Furthermore, the system also includes a fan, which is connected to the air vaporizer to deliver air into the air vaporizer.

[0022] By applying the technical solution of the present invention, at least the following beneficial effects are achieved:

[0023] 1. The air vaporizer installed in the system extracts heat from the atmospheric environment and vaporizes the liquid ammonia, thus improving the system efficiency.

[0024] 2. The high-temperature waste heat of the gas turbine exhaust is used to achieve efficient cracking of ammonia, thereby improving energy utilization efficiency.

[0025] 3. A compression-expansion integrated machine is used to pressurize and cool the cracked ammonia gas to meet the temperature and pressure requirements of the gas turbine fuel supply. The fuel gas is pressurized and cooled with lower energy consumption, further improving the overall efficiency of the system. The work required by the compressor is provided by the expander and the motor. The output power of the motor is adjusted in real time according to demand, which simplifies the structure of the fuel supply system and makes it easier to adjust and control.

[0026] 4. By adding supplementary combustion burners and secondary crackers, the cracking efficiency of ammonia is improved, ensuring efficient cracking of ammonia within the entire gas turbine operating range.

[0027] 5. After partial cracking, the cracking gas is separated into high-purity hydrogen by a hydrogen separator and enters the supplementary combustion burner for combustion. The supplementary combustion system uses pure hydrogen as fuel, and the NOx pollutant emission concentration is low.

[0028] 6. The refrigerant required by the compression-expansion machine is the original liquid ammonia, and there is no need to set up a separate cooling water system. At the same time, the original ammonia can be preheated, which improves the thermal efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 A diagram of a gas turbine ammonia fuel cracking supply system is shown.

[0031] The above drawings include the following reference numerals:

[0032] 1. Liquid ammonia storage tank; 2. Liquid ammonia supply pump; 3. Air vaporizer; 4. Fan; 5. Heat exchanger; 6. Cooler;

[0033] 7. Compression-expansion machine; 71. Variable frequency motor; 72. First-stage compressor; 73. Second-stage compressor; 74. Expander;

[0034] 8. Pressure reducing valve; 9. Hydrogen separator; 10. Hydrogen molecular sieve; 11. Supplementary combustion burner; 12. Variable frequency blower; 13. Catalyst; 14. First ammonia cracker; 15. Second ammonia cracker; 16. Turbine; 17. Combustion chamber; 18. Compressor; 19. Fuel control valve; 20. Chimney. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] The present invention is further described in detail below in conjunction with specific embodiments, and these embodiments cannot be understood as limiting the scope of protection claimed by the present invention. The term "including" when used indicates the existence of a feature, but does not exclude the existence or addition of one or more other features; the orientation or position relationship indicated by the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0037] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0038] Ammonia is a compound composed of hydrogen and nitrogen. As an efficient hydrogen carrier, it has the characteristics of being synthesized from renewable energy. In a gas turbine using ammonia as fuel, the exhaust gas of the gas turbine can be used as a heat source to crack ammonia under normal pressure.

[0039] The present invention provides a gas turbine ammonia fuel cracking supply system, such as Figure 1 As shown, the system uses the exhaust heat source of the gas turbine to crack ammonia under normal pressure. The system includes a liquid ammonia storage tank 1, a liquid ammonia supply pump 2, an air vaporizer 3, a heat exchanger 5, a first ammonia cracker 14, a compression expansion integrated machine 7 and a gas turbine. Among them, the liquid ammonia storage tank 1 stores liquid ammonia, and the liquid ammonia is supplied to the air vaporizer 3 through the liquid ammonia supply pump 2; one end of the heat exchanger 5 is connected to the air vaporizer 3, and the other end is connected to the first ammonia cracker 14, and the first ammonia cracker 14 is arranged in the exhaust channel of the gas turbine; and the compression expansion integrated machine 7 introduced into the system is connected to the heat exchanger 5 at one end, and the other end is connected to the gas turbine. The air vaporizer 3 uses the exhaust heat source to gasify the liquid ammonia into ammonia. The ammonia discharged from the air vaporizer 3 enters the heat exchanger, exchanges heat with the cracked gas after cracking to increase the temperature, and then is introduced into the first ammonia cracker 14. Ammonia is decomposed into a mixture of hydrogen and nitrogen in the first ammonia cracker 14, and the mixture enters the heat exchanger 5. After heat exchange and cooling in the heat exchanger, the mixture enters the compression-expansion integrated machine 7. In the compression-expansion integrated machine 7, the mixture is pressurized and cooled before being delivered to the gas turbine.

[0040] The system effectively pressurizes and cools the ammonia cracking gas by introducing a compression-expansion integrated machine 7 and a heat exchanger 5, thereby achieving the pressurization and cooling of the fuel gas with lower energy consumption, so that it meets the temperature and pressure conditions required for the gas turbine fuel supply, thereby improving the overall efficiency of the system.

[0041] Among them, the compression expansion machine 7 can not only effectively increase the pressure of the fuel, but also preheat the vaporized ammonia in the process of reducing the fuel temperature, thereby significantly reducing energy loss. The compression expansion machine 7 includes a primary compressor 72, a secondary compressor 73 and an expander 74. The primary compressor 72 receives the mixed gas from the heat exchanger 5. The mixed gas enters the cooler 6 for cooling after being pressurized by the primary compressor 72, and then enters the secondary compressor 73 for pressurization, and then enters the cooler 6 for cooling, and then enters the expander 74 for further cooling. In the compression expansion machine 7 and the cooler 6, the fuel is pressurized and cooled to meet the temperature and pressure requirements required for the fuel supply of the gas turbine combustion chamber 17. The compression expansion machine 7 integrates a multi-stage compressor, an expander 74 and a variable frequency motor 71, and each component is coaxially designed. The work required by the compressor is provided by the expander 74 and the motor, and the output power of the motor can be adjusted in real time according to actual needs, thereby reducing the energy consumption of fuel pressurization and realizing efficient use of energy.

[0042] The refrigerant required by the compression-expansion integrated machine 7 is original liquid ammonia, and there is no need to set up a separate cooling water system. At the same time, the original ammonia gas can be preheated, thereby improving the thermal efficiency of the system.

[0043] In this system, by setting up an air vaporizer 3, the heat in the air can be directly used to vaporize liquid ammonia, thereby improving the system efficiency. The ammonia discharged from the air vaporizer 3 enters the heat exchanger 5 to heat exchange with the cracked cracked gas to increase the temperature, and then enters the first ammonia cracker 14 located in the exhaust channel of the gas turbine. In the first ammonia cracker 14, the ammonia absorbs the waste heat of the gas turbine exhaust and is efficiently decomposed into a mixture of hydrogen and nitrogen under the action of the catalyst 13. After the ammonia is cracked into a mixture of hydrogen and nitrogen, it is sent to the gas turbine, which includes a turbine 16, a compressor 18, and a combustion chamber 17. The mixture is burned in the combustion chamber 17. The system extracts heat from the atmospheric environment, makes full use of the waste heat of the gas turbine exhaust, improves the reaction activity of the fuel entering the combustion chamber 17, facilitates the combustion organization in the combustion chamber 17, and can achieve a higher ammonia cracking rate and higher system efficiency.

[0044] The air vaporizer 3 is provided with a forced air supply system, and a fan 4 is connected to the air vaporizer 3 to send air into the air vaporizer 3, thereby enhancing heat exchange and controlling the evaporation amount of liquid ammonia. The air is sent into the air vaporizer 3 through the fan 4, and is discharged into the atmosphere after heating the liquid ammonia.

[0045] The system is also provided with a cooler 6. The cooler 6 is connected to the liquid ammonia supply pump 2. The liquid ammonia at the outlet of the liquid ammonia supply pump 2 is divided into two paths. One path enters the air vaporizer 3 to absorb the heat in the ambient air and evaporate to form ammonia gas; the other path enters the cooler 6 as the refrigerant of the cooler 6. The refrigerant liquid ammonia in the cooler 6 absorbs the heat generated by the double compression of the ammonia cracking gas in the cooler 6, and after vaporization and temperature increase, it is merged into the original ammonia gas path before the ammonia cracker. The cooler 6 does not need to provide cooling water separately, and can effectively preheat the original ammonia gas, which can improve the thermal efficiency of the system.

[0046] The cracking process of ammonia has strict requirements on temperature, pressure and reaction time. During the startup and low load state of the gas turbine, the one-time cracking method is often difficult to ensure the full cracking of ammonia. The present invention improves the cracking efficiency of ammonia by adding a supplementary combustion burner 11 and a second ammonia cracker 15, thereby ensuring the efficient cracking of ammonia within the entire gas turbine operating range.

[0047] Among them, one end of the second ammonia cracking gas 15 is connected to the first ammonia cracker, and the other end is connected to the heat exchanger 5. The mixed gas at the outlet of the first ammonia cracker is divided into two paths, one path enters the heat exchanger 5, and the other path enters the second ammonia cracking gas 15 for further cracking, and then enters the heat exchanger 5. The high-temperature ammonia cracking gas in the heat exchanger 5 is heat exchanged with the normal-temperature ammonia gas to cool down, and then enters the compression expansion integrated machine 7 and the cooler 6.

[0048] Preferably, the system also includes a hydrogen separator 9. One end of the hydrogen separator 9 is connected to the supplementary combustion burner 11. At the outlet of the expander 74, the mixed gas is divided into two paths: one path enters the gas turbine through the fuel control valve 19, and the mixed gas enters the combustion chamber 17 to burn and release heat to provide power for the gas turbine; the other path passes through the hydrogen separator 9 to separate hydrogen from the ammonia cracking gas. The hydrogen separator 9 contains a hydrogen molecular sieve 10, through which hydrogen molecules can pass, while the nitrogen and residual ammonia molecules in the ammonia cracking gas are large and cannot pass through the hydrogen molecular sieve 10. The hydrogen separated by the molecular sieve enters the supplementary combustion burner 11, and the gas that has not passed through the hydrogen molecular sieve 10 is depressurized by the pressure reducing valve 8 and then merged into the ammonia path of the first ammonia cracker 14 for a continuous cracking process.

[0049] High-purity hydrogen is separated by the hydrogen separator 9 and enters the supplementary combustion burner 11 for combustion. The supplementary combustion burner 11 uses pure hydrogen as fuel, and the NOx pollutant emission concentration is low, which will not cause an increase in the NOx emission concentration of the gas turbine.

[0050] The system utilizes the high-temperature waste heat of the gas turbine exhaust to achieve efficient cracking of ammonia, thereby improving energy utilization efficiency. At the same time, the heat energy generated by the compression-expansion integrated machine 7 during operation can be used to preheat the original ammonia, thereby improving the thermal efficiency of the system. The work required by the compressor is provided by the expander 74 and the motor, and the output power of the motor is adjusted in real time according to demand, which simplifies the structure of the fuel supply system and makes it easier to adjust and control.

[0051] The system also includes a pressure reducing valve 8, a variable frequency blower 12, and a chimney 20. The pressure reducing valve 8 is connected to the hydrogen separator 9. The variable frequency blower 12 is connected to the supplementary combustion burner 11 to provide air for the supplementary combustion burner 11. In the supplementary combustion burner 11, the air sent by the variable frequency blower 12 and the hydrogen separated in the hydrogen separator 9 are mixed and burned to produce high-temperature flue gas. At the outlet of the supplementary combustion burner 11, the high-temperature flue gas enters the second ammonia cracker 15 to provide the required high-temperature environment and heat for ammonia cracking, and then is discharged from the second ammonia cracker 15 and merged into the gas turbine exhaust channel before the first ammonia cracker 14, and the high-temperature flue gas is discharged through the chimney 20 connected to the first ammonia cracker 14.

[0052] The ammonia gas turbine fuel cracking supply system proposed in the present invention utilizes the heat in the atmospheric environment to vaporize liquid ammonia, utilizes the exhaust gas of the gas turbine as a heat source, cracks ammonia under normal pressure, and supplements combustion through the hydrogen generated by the cracking, thereby further promoting the cracking process of the ammonia fuel. In order to cope with the low-pressure and high-temperature characteristics of the ammonia cracking gas, the system adopts the technology of the integrated compression and expansion machine 7, which can not only effectively pressurize and cool the ammonia cracking gas to meet the temperature and pressure conditions required for the gas turbine fuel supply, but also simplifies the structure of the fuel supply system, making it easier to adjust and control. In addition, the integrated compression and expansion machine 7 in the system realizes the pressurization and cooling of the fuel gas with lower energy consumption, further improving the overall efficiency of the system. The heat energy generated by the integrated compression and expansion machine 7 during operation can be used to preheat the original ammonia, thereby improving the thermal efficiency of the system.

[0053] In summary, from the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0054] 1. The air vaporizer 3 provided in the system extracts heat from the atmospheric environment and vaporizes the liquid ammonia, thereby improving the efficiency of the system.

[0055] 2. The high-temperature waste heat of the gas turbine exhaust is used to achieve efficient cracking of ammonia, thereby improving energy utilization efficiency.

[0056] 3. The integrated compressor / expander 7 is used to pressurize and cool the cracked ammonia gas to meet the temperature and pressure requirements of the gas turbine fuel supply. The fuel gas is pressurized and cooled with lower energy consumption, further improving the overall efficiency of the system. The work required by the compressor is provided by the expander 74 and the motor, and the output power of the motor is adjusted in real time according to the demand, which simplifies the structure of the fuel supply system and makes it easier to adjust and control.

[0057] 4. By adding the supplementary combustion burner 11 and the secondary cracker, the cracking efficiency of ammonia is improved, ensuring the efficient cracking of ammonia within the entire gas turbine operating range.

[0058] 5. The cracked gas after partial cracking is separated into high-purity hydrogen by the hydrogen separator 9 and enters the supplementary combustion burner 11 for combustion. The supplementary combustion system uses pure hydrogen as fuel and has a low NOx pollutant emission concentration.

[0059] 6. The refrigerant required by the compression-expansion integrated machine 7 is the original liquid ammonia, and there is no need to set up a separate cooling water system. At the same time, the original ammonia gas can be preheated, thereby improving the thermal efficiency of the system.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas turbine ammonia fuel cracking supply system, wherein the system uses the exhaust heat source of the gas turbine to crack the ammonia under normal pressure, characterized in that: The system comprises: A liquid ammonia storage tank (1), a liquid ammonia supply pump (2) and an air vaporizer (3), wherein the liquid ammonia storage tank (1) stores liquid ammonia, the liquid ammonia is supplied to the air vaporizer (3) through the liquid ammonia supply pump (2), and the air vaporizer (3) uses the exhaust heat source to gasify the liquid ammonia into ammonia gas; a heat exchanger (5) and a first ammonia cracker (14), wherein one end of the heat exchanger (5) is in communication with the air vaporizer (3), and the other end is in communication with the first ammonia cracker (14), and the first ammonia cracker (14) is arranged in the exhaust passage of the gas turbine, the heat exchanger (5) receives the ammonia from the air vaporizer (3), and introduces the ammonia after heat exchange into the first ammonia cracker (14), the ammonia is decomposed into a mixed gas of hydrogen and nitrogen in the first ammonia cracker (14), and the mixed gas enters the heat exchanger (5); a compression-expansion integrated machine (7), the compression-expansion integrated machine (7) being in communication with the heat exchanger (5), the compression-expansion integrated machine (7) receiving the mixed gas cooled by the heat exchanger (5), To pressurize and cool the mixed gas; A gas turbine is connected to the integrated compression-expansion machine (7) and receives the mixed gas processed by the integrated compression-expansion machine (7).

2. The ammonia fuel cracking supply system according to claim 1, characterized in that: The system further comprises a cooler (6), wherein the cooler (6) is connected to the liquid ammonia supply pump (2), and the liquid ammonia at the outlet of the liquid ammonia supply pump (2) is divided into two paths, one path enters the air vaporizer (3), absorbs heat from the ambient air and evaporates to form ammonia gas; and the other path enters the cooler (6), serving as a refrigerant for the cooler (6).

3. The ammonia fuel cracking supply system according to claim 2, characterized in that: The system further comprises a second ammonia cracker (15), one end of the second ammonia cracker (15) being connected to the first ammonia cracker (14), and the other end being connected to the heat exchanger (5); the mixed gas at the outlet of the first ammonia cracker (14) is divided into two paths, one path entering the heat exchanger (5), and the other path entering the second ammonia cracker (15) for further cracking, and then entering the heat exchanger (5).

4. The ammonia fuel cracking supply system according to claim 3, characterized in that: The integrated compression-expansion machine (7) comprises a primary compressor (72), a secondary compressor (73) and an expander (74). The primary compressor (72) receives the mixed gas from the heat exchanger (5). The mixed gas is pressurized by the primary compressor (72) and then enters the cooler (6) for cooling. The mixed gas then enters the secondary compressor (73) for pressurization and then enters the cooler (6) for cooling. The mixed gas then enters the expander (74) for further cooling.

5. The ammonia fuel cracking supply system according to claim 4, characterized in that: The system also includes a hydrogen separator (9). At the outlet of the expander (74), the mixed gas is divided into two paths: one path enters the combustion chamber (17) of the gas turbine through a fuel control valve (19); and the other path passes through the hydrogen separator (9) to separate hydrogen from the mixed gas.

6. The ammonia fuel cracking supply system according to claim 5, characterized in that: The system further comprises a supplementary combustion burner (11) and a pressure reducing valve (8); one end of the hydrogen separator (9) is in communication with the supplementary combustion burner (11), and the other end is in communication with the pressure reducing valve (8).

7. The ammonia fuel cracking supply system according to claim 6, characterized in that: The hydrogen separator (9) contains a hydrogen molecular sieve (10), and the hydrogen separated by the hydrogen molecular sieve (10) enters the supplementary combustion burner (11); the gas that has not passed through the hydrogen molecular sieve (10) is reduced in pressure by the pressure reducing valve (8) and then flows into the ammonia path of the first ammonia cracker (14) to undergo a continuous cracking process.

8. The ammonia fuel cracking supply system according to claim 7, characterized in that: The system further comprises a variable frequency blower (12), wherein the variable frequency blower (12) is connected to the supplementary combustion burner (11) to provide air for the supplementary combustion burner (11), and the air delivered by the variable frequency blower (12) and the hydrogen separated in the hydrogen separator (9) are mixed and burned to generate high-temperature flue gas.

9. The ammonia fuel cracking supply system according to claim 8, characterized in that: At the outlet of the supplementary combustion burner (11), the high-temperature flue gas enters the second ammonia cracker (15), provides high temperature for the second ammonia cracker (15), and then is discharged from the second ammonia cracker (15) and merged into the exhaust passage of the gas turbine before the first ammonia cracker (14).

10. The ammonia fuel cracking supply system according to claim 9, characterized in that: The system further comprises a chimney (20), wherein the chimney (20) is in communication with the first ammonia cracker (14) to discharge the high-temperature flue gas.

11. The ammonia fuel cracking supply system according to claim 10, characterized in that: The system further comprises a fan (4), wherein the fan (4) is in communication with the air vaporizer (3) so as to deliver air into the air vaporizer (3).

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