Gas turbine auxiliary system for NH3 regulation

Abstract

A system for generating electricity using a gas turbine is disclosed. The system includes an ammonia cracking device to convert at least a portion of the NH3 stream to H2 and N2 to achieve a gas NH3 / H2 / N2 mixture that allows the gas turbine to be operated under each condition. In one aspect, an NH3 stream is split into a first NH3 stream and a second NH3 stream, the first NH3 stream being split into H2 and N2 by splitting to obtain H2 and N2 streams, the second NH3 stream being directed to a gas turbine through a bypass line.

Description

Technical Field

[0001] The present disclosure relates to a system for generating electricity using a gas turbine, wherein the system includes an ammonia cracking unit. Embodiments disclosed herein specifically relate to a gas turbine auxiliary system for NH3 regulation, wherein a fuel skid processes an ammonia input stream to achieve an NH3 / H2 / N2 gas mixture that allows operation of the gas turbine under each condition. Also disclosed herein are methods for optimizing gas turbine operation and controlling NO x emissions from the gas turbine under each gas turbine condition. Background Art

[0002] Gas turbines are commonly used to generate electricity in power plants by burning fuel therein. In particular, the basic operation of a gas turbine is the Brayton cycle with air as the working fluid: atmospheric air flows through a compressor, which raises it to a higher pressure; then energy is added by injecting fuel into the air in a combustion chamber and igniting it, such that combustion produces a high-temperature stream; this high-temperature pressurized gas enters a turbine, during which shaft work output is generated to drive the compressor; the unused energy is released in the form of exhaust gas, which can be reused for external work, such as directly generating thrust in a turbojet engine or rotating a second independent turbine (called a power turbine) that can be connected to a fan, propeller, or generator. The purpose of the gas turbine determines the design such that an optimal energy distribution between thrust and shaft work is achieved. Since a gas turbine is an open system that does not reuse the same air, the fourth step of the Brayton cycle (cooling of the working fluid) is omitted.

[0003] Commonly used fuels include natural gas, propane, diesel, biogas, and biodiesel. One of the main problems associated with burning fuels such as these in a gas turbine is the resulting carbon dioxide (CO2) gas. Increased levels of CO2 in the atmosphere are harmful to the environment and are a known cause of global warming. Therefore, there is a need to provide fuels for use in gas turbines that do not produce CO2 upon combustion or from which CO2 must be removed prior to combustion.

[0004] Carbon-free fuels include ammonia and hydrogen. However, both ammonia and hydrogen have some problems associated with their direct use as fuels in gas turbines. The main challenge associated with directly using ammonia as a fuel in a gas turbine is that ammonia is oxidized to nitrogen oxides NO x , a pollutant that causes acid rain and global warming. Additionally, due to the low heat content and low reactivity of ammonia with oxygen, ammonia combustion within a gas turbine has stability problems (flameout) across the entire range of gas turbine operating conditions. On the other hand, even though hydrogen combustion still produces NO xPollutants, but the stability problem (flameout) disappears. However, many problems are associated with using hydrogen as a fuel, including storage issues and the fact that hydrogen is an extremely flammable gas. The availability of N2 as an inert substance during the combustion process can help reduce NO x emissions, which depends on the type of flame achieved in the gas turbine combustor.

[0005] CN107288780A discloses a system for generating electricity using a gas turbine, in which ammonia is used as a fuel. Upstream of the combustion chamber, ammonia is partially decomposed in an ammonia cracking device to produce hydrogen, thereby providing a fuel mixture containing hydrogen and ammonia. Since the ignition point of hydrogen is lower than that of ammonia, hydrogen first burns in the combustion chamber to release heat, thereby igniting the ammonia in the combustion chamber. Therefore, hydrogen can accelerate the combustion process, and thus, the combustion performance of the ammonia fuel is improved. In summary, the amount of hydrogen supplied is a function of NH3 ignition. However, the system disclosed in CN107288780 does not fully overcome the environmental problems caused by nitrogen oxides formed during the combustion process due to the oxidation of ammonia.

[0006] US11084719B2 discloses a method for generating electricity using a gas turbine, comprising the steps of: (i) vaporizing and preheating liquid ammonia to produce preheated ammonia gas; (ii) introducing the preheated ammonia gas into an ammonia cracking device adapted to convert ammonia gas into a mixture of hydrogen and nitrogen; (iii) converting the preheated ammonia gas into a mixture of hydrogen and nitrogen in the device; (iv) cooling the mixture of hydrogen and nitrogen to obtain a cooled mixture of hydrogen and nitrogen; (v) introducing the cooled mixture of hydrogen and nitrogen into the gas turbine; and (vi) burning the cooled mixture of hydrogen and nitrogen in the gas turbine to generate electricity. US11084719B2 also discloses embodiments in which the composition of the mixture of hydrogen and nitrogen leaving the ammonia cracking device can be adjusted using purification techniques. However, the composition of the output mixture from the cracking process may be far from optimal for GT operation requirements.

[0007] US11156168B2 discloses a gas turbine power plant provided with a gas turbine, a heating device, a cracked gas pipeline, and a cracked gas compressor. The heating device heats ammonia and thermally decomposes ammonia, thereby converting ammonia into a cracked gas containing hydrogen gas and nitrogen gas. The cracked gas pipeline sends the cracked gas from the heating device to the gas turbine. The cracked gas compressor increases the pressure of the cracked gas to a pressure equal to or higher than the feed pressure at which the cracked gas can be fed into the gas turbine. US11156168B2 also discloses a control device that regulates the ratio of the flow rate of the cracked gas to the flow rate of the entire fuel gas (which includes natural gas and the cracked gas). Controlling this ratio allows obtaining and regulating the mixture of the gas cracked into the combustion chamber and natural gas. However, burning natural gas still produces a high level of carbon dioxide, which is released into the atmosphere or requires an additional carbon capture system.

[0008] In summary, the solutions of the prior art either have a negative impact on the operating cost of the system or have an adverse impact on the environment. Therefore, an improved system that uses a gas turbine and uses ammonia as fuel to generate electricity to solve the problem of regulating NH3 in real time to achieve a gas NH3 / H2 / N2 mixture that allows the gas turbine to operate under each condition would be beneficial and would be welcomed in this technology. Flexible NH3 regulation is required and regulation is to be carried out at different levels along the path towards the turbine. Therefore, a system that can adjust the fuel at different stages and deliver the fuel to the gas turbine is needed to improve performance but also reduce NO x emissions. More generally, it is desirable to provide methods and systems suitable for more effectively solving the problems brought about by providing an auxiliary system for NH3 regulation that can achieve a gas NH3 / H2 / N2 mixture that allows the gas turbine to operate under each condition. SUMMARY OF THE INVENTION

[0009] In one aspect, the subject matter disclosed herein relates to an improved system that uses a gas turbine and uses ammonia as fuel to generate electricity. The system includes an ammonia cracking device to convert ammonia into hydrogen and nitrogen for delivery to the gas turbine; and an ammonia bypass pipeline to direct a portion of the ammonia directly to the gas turbine. The system further includes a plurality of flow valves controlled by an auxiliary control unit. The flow valves include a gas flow valve arranged downstream of the ammonia cracking reactor and / or a gas NH3 bypass flow valve arranged along the gas NH3 feed pipeline connected downstream of the NH3 bypass pipeline. The embodiments disclosed herein specifically relate to a gas turbine auxiliary system for NH3 regulation, in which a fuel skid processes the ammonia input stream to achieve a gas NH3 / H2 / N2 mixture that allows the gas turbine to operate under each condition.

[0010] In one aspect, the subject matter disclosed herein relates to a method of generating electricity using a gas turbine and using ammonia as fuel. An ammonia conditioning auxiliary system is operated by a control routine that is a function of GT parameters, combustion parameters, and NOx requirements at the GT exhaust. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The disclosed embodiments of the present invention, as well as many of its attendant advantages, will be better understood when considered in conjunction with the accompanying drawings, which are to be considered in conjunction with the following detailed description, in which:

[0012] Figure 1 FIG. shows a schematic diagram of a power generation system using a gas turbine and including an ammonia cracking unit according to a first embodiment;

[0013] Figure 2 shows Figure 1 a block diagram of the control architecture of the power generation system of;

[0014] Figure 3 FIG. shows a schematic diagram of a power generation system using a gas turbine and including an ammonia cracking unit according to a second embodiment;

[0015] Figure 4 shows Figure 3 a block diagram of the control architecture of the power generation system of;

[0016] Figure 5 FIG. shows a schematic diagram of a power generation system using a gas turbine and including an ammonia cracking unit according to a third embodiment;

[0017] Figure 6 FIG. shows a schematic diagram of a power generation system using a gas turbine and including an ammonia cracking unit according to a fourth embodiment;

[0018] Figure 7 FIG. shows a schematic diagram of a power generation system using a gas turbine and including an ammonia cracking unit according to a fifth embodiment; and

[0019] Figure 8 FIG. shows a schematic diagram of a power generation system using a gas turbine and including an ammonia cracking unit according to a fifth embodiment. DETAILED DESCRIPTION

[0020] According to one aspect, the subject matter relates to a system for generating electricity using a gas turbine, wherein the system includes an ammonia cracking unit to convert at least a portion of an NH3 stream into H2 and N2 to achieve a gaseous NH3 / H2 / N2 mixture that permits operation of the gas turbine under each condition.

[0021] In another aspect, the subject matter disclosed herein relates to a gas turbine auxiliary system for NH3 regulation, wherein an NH3 feed stream is split into two separate NH3 streams. A first NH3 stream is cracked into H2 and N2 through a catalytic cracking reactor or a thermal cracking reactor to obtain an H2 and N2 stream to be delivered to the gas turbine, and a second NH3 stream is directed to the gas turbine through a bypass line. To control the correct amounts of ammonia, hydrogen, and nitrogen delivered to the gas turbine, the system further includes a plurality of flow valves controlled by an auxiliary control unit, the flow valves including a gas flow valve disposed downstream of the ammonia cracking reactor. Additionally or alternatively, the system may further include a gas NH3 bypass flow valve disposed along a gas NH3 feed line downstream of the NH3 bypass line connection. In particular, downstream of the cracking reactor, the H2 and N2 streams may be mixed with the second NH3 stream to obtain a gas NH3 / H2 / N2 mixture that, on the one hand, has a controlled ratio of NH3 and, on the other hand, has a controlled ratio of H2 and N2. Optionally, downstream of the cracking reactor, N2 may be separated from the H2 and N2 streams in the H2 and N2 streams to obtain a gas NH3 / H2 / N2 mixture with controlled ratios of NH3, H2, and N2 and additionally allowing N2 to be used as a purge gas.

[0022] Reference will now be made in detail to embodiments of the disclosure, one or more examples of which are illustrated in the accompanying drawings. Each example is provided by way of explanation of the disclosure and not limitation thereof. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the scope or spirit of the disclosure. References throughout this specification to "one embodiment" or "an embodiment" or "some embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the disclosed subject matter. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," "in some embodiments" throughout the specification are not necessarily all referring to the same embodiment. Moreover, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0023] When introducing elements of various embodiments, the articles "a," "an," "the," and "said" are intended to mean that there is one or more of the elements. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements in addition to the listed elements.

[0024] Now referring to the drawings, Figure 1FIG. shows a schematic diagram of an exemplary power generation system including a gas turbine 100. The gas turbine 100 includes a compressor, a combustion chamber, and a turbine. The gas turbine 100 is supplied by a gas NH3 / H2 / N2 mixture stream and a gas NH3 stream. The gas NH3 / H2 / N2 mixture stream is directed to the primary of the gas turbine 100 through the gas turbine feed line 1, and the gas NH3 stream is directed to the secondary of the gas turbine 100 through the gas NH3 feed stream line 2. In addition, a gas turbine auxiliary system for NH3 regulation is arranged upstream of the gas turbine 100. The gas turbine auxiliary system includes an NH3 heater / vaporizer / pressurizer 200 to heat and then vaporize the liquid NH3 stream from the NH3 stream line 4, and includes a cracking reactor 300 which is connected to the NH3 heater / vaporizer / pressurizer through the NH3 heater / vaporizer / pressurizer gas outlet line 5 and the cracking reactor feed line 6. According to an alternative exemplary embodiment, the NH3 heater / vaporizer / pressurizer consists of a shell and tube heat exchanger or a plate heat exchanger. In some embodiments, the heat transfer fluid of the heater / vaporizer / pressurizer is the gas turbine exhaust gas or another intermediate fluid (such as steam or hot oil). According to an exemplary embodiment, the heat exchanger is made in two stages, one stage for heating and vaporizing liquid ammonia, and the other stage for restoring the initial pressure or finally increasing the ammonia gas pressure. In some embodiments, a storage tank for high-pressure ammonia gas is also included in the heater / vaporizer / pressurizer system.

[0025] According to Figure 1 the exemplary embodiment shown, the NH3 cracking reactor 300 is a catalytic or thermal reactor which is configured to process ammonia in the presence of a catalyst or under temperature control according to the following reaction and dissociate it into at least its basic components, namely hydrogen and nitrogen:

[0026]

[0027] The mixture of hydrogen and nitrogen and the finally present unreacted ammonia resulting from the cracking reaction are then directed to the gas turbine 100 through the gas NH3 / H2 / N2 mixture stream outlet line 7, which is connected downstream to the gas turbine feed line 1.

[0028] The NH3 bypass stream is diverted from the gas NH3 stream from the heater / vaporizer / pressurizer through the gas NH3 bypass stream line 11, which is connected upstream to the heater / vaporizer / pressurizer gas outlet line 5 and downstream to the gas NH3 feed stream line 2 of the gas turbine 100, particularly to the secondary of the gas turbine 100.

[0029] The system allows the gas turbine control loop to control the ratio of NH3 burned together with H2 and N2 from the cracking reactor according to the gas turbine operation needs.

[0030] The exhaust gas from the gas turbine 100 is directed to the exhaust gas flow line 15, and a part of the exhaust gas flow is diverted from the exhaust gas flow line through the exhaust gas heat recovery line 12, which is directed to the cracking reactor 300 and / or the NH3 heater / vaporizer / pressurizer 200. Refer to Figure 1 , the exhaust gas heat recovery line 12 is divided into a first heat recovery sub-line 13 and a second heat recovery sub-line 14. The first heat recovery sub-line is directed to the cracking reactor 300, and the second heat recovery sub-line is directed to the NH3 heater / vaporizer / pressurizer 200.

[0031] An emergency system (not shown) is arranged along the gas turbine feed line 1 and includes vents and emergency valves to prevent overpressure.

[0032] Figure 1The gas turbine auxiliary system for NH3 regulation operates as follows. The system is initiated by liquid ammonia that is heated / vaporized / pressurized inside the NH3 heater / vaporizer / pressurizer 200 and fed as a gas to the NH3 cracking reactor 300. A portion of the gaseous ammonia from the NH3 heater / vaporizer / pressurizer 200 spills over into the gas NH3 bypass flow line 11 and is directed through the gas NH3 feed flow line 2 to the gas turbine 100. A portion of the heat generated by the gas turbine 100 is sent to the NH3 heater / vaporizer / pressurizer 200 and the NH3 cracking reactor 300. Additional liquid ammonia is heated, vaporized, and pressurized in the vaporizer / pressurizer 200, and the NH3 cracking reactor 300 begins operation, feeding a gaseous mixture into the gas NH3 / H2 / N2 mixed stream outlet line 7. A storage drum (not shown) may optionally be arranged along the gas NH3 / H2 / N2 mixed stream outlet line 7. When the pressure in the gas NH3 / H2 / N2 mixed stream outlet line 7 reaches a threshold, the startup sequence of the gas turbine may begin. Using the flow fed through the gas turbine feed line 1 or the gas NH3 feed flow line 2 as fuel and receiving the gas NH3 flow from the gas NH3 bypass flow line 11, gas turbine ignition is obtained. If the energy to start the NH3 heater / vaporizer / pressurizer 200 and the NH3 cracking reactor 300 is not available, a startup fuel (such as natural gas) can be connected to the gas turbine feed line 1 or the gas NH3 feed flow line 2 and used for gas turbine ignition and load ramping to the end of the gas turbine sequence or full speed no-load condition. Once the gas turbine is ignited, the exhaust heat begins to supply energy to the NH3 heater / vaporizer / pressurizer 200 and the NH3 cracking reactor 300. The NH3 heater / vaporizer / pressurizer heats, vaporizes, and pressurizes the liquid ammonia into gaseous ammonia, and the NH3 cracking reactor cracks the gaseous ammonia into a mixture of hydrogen, nitrogen, and ultimately unreacted ammonia. Once the proper mixture is formed, the flow rate of the gas NH3 / H2 / N2 mixed stream inside the gas turbine feed line 1 is controlled according to the gas turbine control plan. During all gas turbine sequences (load ramping, load operation, normal shutdown), the gas turbine auxiliary control unit 37 manages the requirements for the hydrogen, nitrogen, and residual ammonia mixture composition in the gas turbine feed line 1 as parameters of the NH3 cracking reactor 300 and manages the flow rate ratio between the gas turbine feed line 1 and the gas NH3 feed flow line 2. The parameters of the NH3 cracking reactor managed by the gas turbine auxiliary control unit 37 strictly depend on the NH3 cracking reactor technology. In some embodiments, the parameters of the NH3 cracking reactor include the temperature of the reacting ammonia gas at a specific section of the reactor (e.g., at the inlet section) and the NH3 cracking reactor recycle ratio.An emergency shutdown of the gas turbine 100 enables the gas turbine auxiliary system for NH3 regulation to be immediately isolated from the gas turbine 100 and de-energizes the NH3 heater / vaporizer / pressurizer 200 and the NH3 cracking reactor 300 according to their specific safety requirements.

[0033] Figure 1 The operation of the gas turbine auxiliary system for NH3 regulation is controlled by a plurality of control valves operating according to a control method to be explained hereinafter. The gas flow valve 21 is arranged downstream of the NH3 cracking reactor 300 along the gas turbine feed line 1 to control the flow of the gas NH3 / H2 / N2 mixture inside the gas turbine feed line 1. The gas NH3 bypass flow rate valve 22 is arranged downstream of the gas NH3 bypass flow line 11 along the gas NH3 feed flow line 2 to control the flow rate of the gas NH3 bypass flow directed to the gas turbine 100 and, conversely, to control the flow rate of the gas NH3 flow directed to the cracking reactor 300 through the cracking reactor feed line 6. Finally, the heat recovery flow rate valve 26 is arranged on the first heat recovery sub-line 13 to control the portion of the exhaust gas from the gas turbine 100 directed to the NH3 cracking reactor 300 and, conversely, to control the portion of the exhaust gas directed to the NH3 heater / vaporizer / pressurizer 200. The gas flow valve 21, the gas NH3 bypass flow rate valve 22, and the heat recovery flow rate valve 26 can be electric valves, pneumatic valves, or hydraulically actuated valves.

[0034] Continuing to refer Figure 1 to Figure 2 the block diagram of the control architecture of the power generation system shown, the operation of the flow valves 21, 22, and the heat recovery flow rate valve 26 is as follows. The gas turbine control unit 30 (such as a computer or a programmable logic controller (PLC)) receives the following input parameters: gas turbine parameters 31, combustion parameters 32, and NOx demand 33. In particular, the gas turbine parameters 31 are related to gas turbine technology. In some embodiments, the gas turbine parameters 31 include the gas turbine power generation, the gas turbine speed, and the gas turbine exhaust gas temperature. The combustion parameters 32 depend on the combustion technology employed by the gas turbine. In some embodiments, the combustion parameters 32 include the fuel-air ratio in a specific area of the burner, the distribution of the heat load along the burner, and the NO x and NH3 leakage at the outlet of the burner. The NOx demand 33 includes the NO x emissions in the exhaust gas stream downstream of the gas turbine. The total amount of gas fed into the gas turbine through the gas turbine feed line 1 (denoted as m1) and the gas NH3 feed flow line 2 (m2) is a function of the above gas turbine parameters:

[0035] m1 + m2 = f(GT parameters)

[0036] The volume composition of the gas NH3 / H2 / N2 mixture stream in the gas turbine feed line 1 (represented by the reference numeral 34 in Figure 2 ); the ratio 35 of the mass flow rate of gas NH3 (m2) through the gas NH3 feed stream line 2 to the total mass flow rate (m1 + m2) of the gas NH3 / H2 / N2 mixture stream (m1) through the gas turbine feed line 1 and the gas NH3 feed stream (m2) through the gas NH3 feed stream line 2 to the gas turbine is a function of the above combustion parameters and NOx requirements:

[0037] x 1i = f(combustion parameters; NOx requirements)

[0038] m2 / (m1 + m2) = f(combustion parameters; NOx requirements)

[0039] These parameters are inputs to the auxiliary control unit 37, such as a computer or a programmable logic controller (PLC), which is configured to control the operation of the flow valves 21, 22, and the heat recovery flow valve 26 according to the following conditions. The operation Y of the gas flow valve 21 that controls the amount of the gas NH3 / H2 / N2 mixture stream flowing inside the gas turbine feed line 1 21 is a function of the total amount of the gas stream m1 fed to the gas turbine through the gas turbine feed line 1 and the gas NH3 feed stream m2 fed to the gas turbine through the gas NH3 feed stream line 2:

[0040] Y 21 = f(m1 + m2)

[0041] The operation Y of the gas NH3 bypass flow valve 22 22 is a function of the ratio 35 of the mass flow rate of gas NH3 m2 through the gas NH3 feed stream line 2 to the total mass flow rate of the gas NH3 / H2 / N2 mixture stream m1 through the gas turbine feed line 1 and the gas NH3 feed stream m2 through the gas NH3 feed stream line 2 to the gas turbine:

[0042] Y 22 = f(m2 / (m1 + m2))

[0043] Finally, the operation of the heat recovery flow valve 26 is a function of the volume composition of the gas:

[0044] Y 26 = f(x 1i )

[0045] The above control method allows changing the fuel composition of the gas turbine and injecting ammonia at any ratio according to any ultimate burner and gas turbine requirements (which are not part of this disclosure).

[0046] Continue to refer to Figure 1 and Figure 2 , Figure 3 FIG. shows a schematic diagram of an exemplary power generation system according to a second embodiment. The gas turbine 100 includes a compressor, a combustion chamber, and a turbine. The gas turbine 100 is fed by a gas NH3 / H2 / N2 mixture stream, a gas NH3 stream, and a gas N2 stream. The gas NH3 / H2 / N2 mixture stream is directed to the primary of the gas turbine of the gas turbine 100 through the gas turbine feed line 1, the gas NH3 stream is directed to the secondary of the gas turbine of the gas turbine 100 through the gas NH3 feed stream line 2, and the gas N2 stream is directed to the secondary of the gas turbine of the gas turbine 100 through the gas N2 feed stream line 3. In addition, a gas turbine auxiliary system for NH3 regulation is arranged upstream of the gas turbine 100. The gas turbine auxiliary system includes: an NH3 heater / vaporizer / pressurizer 200 to heat and then vaporize the liquid NH3 stream from the NH3 stream line 4; and includes a cracking reactor 300, which is connected to the NH3 heater / vaporizer / pressurizer through the NH3 heater / vaporizer / pressurizer gas outlet line 5 and the cracking reactor feed line 6.

[0047] According to this embodiment, the mixture of hydrogen and nitrogen produced by the cracking reaction and the unreacted ammonia are processed to separate the gas NH3 / H2 / N2 mixture stream and the gas N2 stream. The gas NH3 / H2 / N2 mixture stream from the cracking reactor 300 is directed to the gas turbine 100 through the gas NH3 / H2 / N2 mixture stream outlet line 7, and the outlet line is connected to the gas turbine feed line 1 downstream.

[0048] The separation of nitrogen can be obtained by different techniques. According to an exemplary embodiment, the NH3 cracking reactor 300 is a membrane reactor, which operates as follows. The membrane divides the reactor into two separate sections. The first section is directly connected to the cracking reactor feed line 6. The ammonia fed into the membrane reactor reacts inside the first section. A small portion of the nitrogen gas produced by the cracking reaction permeates the membrane and enters the second section of the membrane reactor, separating from the hydrogen, the unreacted ammonia, and a small portion of the remaining nitrogen gas retained inside the first section of the membrane reactor.

[0049] The gas N2 stream from the cracking reactor 300 is directed to the gas turbine 100 through the gas N2 stream outlet line 8, and the outlet line is connected to the gas N2 feed stream line 3 downstream. A small portion of the gas N2 stream from the cracking reactor 300 can be diverted and returned to the gas NH3 / H2 / N2 mixture stream outlet line 7 through the gas N2 bypass line 9 to control the composition of the NH3 / H2 / N2 mixture stream directed to the gas turbine 100 through the gas turbine feed line 1.

[0050] The NH3 bypass flow diverges (branches off) from the gas NH3 flow from the heater / vaporizer / pressurizer through the gas NH3 bypass flow line 11. This bypass flow line is connected upstream to the heater / vaporizer / pressurizer gas outlet line 5 and downstream to the gas NH3 feed flow line 2 of the gas turbine 100, specifically to the secondary of the gas turbine of the gas turbine 100.

[0051] The composition of the NH3 / H2 / N2 mixed gas flow directed to the gas turbine 100 through the gas turbine feed line 1 is also controlled by mixing the gas NH3 / H2 / N2 mixed gas flow with ammonia. For this purpose, a gas NH3 bypass split is extracted from the gas NH3 bypass flow through the gas NH3 bypass split line 10. This bypass split line is connected upstream to the gas NH3 bypass flow line 11 and downstream to the gas NH3 / H2 / N2 mixed gas flow outlet line 7.

[0052] The system allows the gas turbine control loop to control the ratio of NH3 burned together with H2 and N2 from the cracking reactor according to the gas turbine operation requirements.

[0053] The exhaust gas from the gas turbine 100 is directed to the exhaust gas flow line 15. A part of the exhaust gas flow is diverted from this exhaust gas flow line through the exhaust gas heat recovery line 12, which is directed to the cracking reactor 300 and / or the NH3 heater / vaporizer / pressurizer 200. Refer to Figure 3 , the exhaust gas heat recovery line 12 is divided into a first heat recovery sub-line 13 and a second heat recovery sub-line 14. The first heat recovery sub-line is directed to the cracking reactor 300, and the second heat recovery sub-line is directed to the NH3 heater / vaporizer / pressurizer 200.

[0054] An emergency system (not shown) is arranged along the gas turbine feed line 1 and includes a vent and an emergency valve to prevent overpressure.

[0055] Figure 3The gas turbine auxiliary system for NH3 regulation operates as follows. The system is initiated by liquid ammonia that is heated / vaporized / pressurized inside the NH3 heater / vaporizer / pressurizer 200 and fed into the NH3 cracking reactor 300 in gaseous form. A portion of the gaseous ammonia from the NH3 heater / vaporizer / pressurizer 200 spills over into the gas NH3 bypass flow line 11 and is directed through the gas NH3 feed flow line 2 to the gas turbine 100. A portion of the heat generated by the gas turbine 100 is sent to the NH3 heater / vaporizer / pressurizer 200 and the NH3 cracking reactor 300. Additional liquid ammonia is heated, vaporized, and pressurized in the vaporizer / pressurizer 200, and the NH3 cracking reactor 300 begins operation, feeding the gaseous mixture into the gas NH3 / H2 / N2 mixed stream outlet line 7. A storage drum (not shown) may optionally be arranged along the gas NH3 / H2 / N2 mixed stream outlet line 7. When the pressure in the gas NH3 / H2 / N2 mixed stream outlet line 7 reaches a threshold, the startup sequence of the gas turbine may begin. Using the flow fed through the gas turbine feed line 1 or the gas NH3 feed flow line 2 as fuel, a gas NH3 flow is received from the gas NH3 bypass flow line 11 to obtain gas turbine ignition. If the energy to start the NH3 heater / vaporizer / pressurizer 200 and the NH3 cracking reactor 300 is not available, a startup fuel (such as natural gas) can be connected to the gas turbine feed line 1 or the gas NH3 feed flow line 2 and used for gas turbine ignition and load ramping to the end of the gas turbine sequence or full speed no-load condition. Once the gas turbine is ignited, the exhaust heat begins to supply energy to the NH3 heater / vaporizer / pressurizer 200 and the NH3 cracking reactor 300. The NH3 heater / vaporizer / pressurizer heats, vaporizes, and pressurizes the liquid ammonia into gaseous ammonia, and the NH3 cracking reactor cracks the gaseous ammonia into a mixture of hydrogen, nitrogen, and unreacted ammonia. Once the appropriate mixture is formed, the flow rate of the gas NH3 / H2 / N2 mixed stream inside the gas turbine feed line 1 is controlled according to the gas turbine control plan. During all gas turbine sequences (load ramping, load operation, normal shutdown), the gas turbine control system manages the requirements for the composition of the hydrogen, nitrogen, and residual ammonia mixture in the gas turbine feed line 1 as a parameter of the NH3 cracking reactor 300 and manages the flow rate ratio between the gas turbine feed line 1 and the gas NH3 feed flow line 2. An emergency shutdown of the gas turbine enables the gas turbine auxiliary system for NH3 regulation to be immediately isolated from the gas turbine and de-energizes the NH3 heater / vaporizer / pressurizer 200 and the NH3 cracking reactor 300 according to their specific safety requirements. The NH3 cracking reactor 300 also separates nitrogen from the gas mixture of hydrogen, nitrogen, and unreacted ammonia and thus provides a N2 flow in the gas N2 stream outlet line 8, which can be used for different applications such as N2 storage or purge services for the gas turbine.

[0056] Figure 3 The operation of the gas turbine auxiliary system for NH3 regulation is controlled by a plurality of control valves operated according to a control method to be explained below. The gas flow valve 21 (i.e., valve 21) is arranged along the gas turbine feed line 1 to control the flow of the gas NH3 / H2 / N2 mixture inside the gas turbine feed line 1. The gas NH3 bypass flow valve 22 is arranged along the gas NH3 bypass flow line 11 to control the flow of the gas NH3 bypass flow directed to the gas turbine through the gas NH3 feed flow line 2, and conversely to control the flow of the gas NH3 flow directed to the cracking reactor 300 through the cracking reactor feed line 6. The gas NH3 bypass split flow valve 23 is arranged along the gas NH3 bypass split line 10 to control the amount of the gas NH3 bypass flow directed to the gas NH3 / H2 / N2 mixture outlet line 7, so as to control the composition of the NH3 / H2 / N2 mixture flow directed to the gas turbine 100 through the gas turbine feed line 1. The gas N2 bypass flow valve 24 is arranged along the gas N2 bypass line 9 to control the nitrogen flow rate of the gas N2 flow outlet line 8 from the NH3 cracking reactor 300, and this nitrogen flow rate is used for mixing with the gas NH3 / H2 / N2 mixture flow directed to the gas turbine 100 through the gas turbine feed line 1. In addition, the gas turbine N2 feed flow valve 25 is arranged along the gas N2 feed flow line 3 to control the nitrogen flow rate of the gas N2 flow outlet line 8 directed from the NH3 cracking reactor 300 to the gas turbine 100. Finally, the heat recovery flow valve 26 is arranged on the first heat recovery sub-line 13 to control the part of the heat recovery flow rate of the exhaust gas directed from the gas turbine 100 to the NH3 cracking reactor 300, and conversely to control the part of the heat recovery flow rate directed to the NH3 heater / vaporizer / pressurizer 200. The gas flow valve 21, the gas NH3 bypass flow valve 22, the gas NH3 bypass split flow valve 23, the gas N2 bypass flow valve 24, the gas turbine N2 feed flow valve 25 and the heat recovery flow valve 26 can be electric valves, pneumatic valves or hydraulically driven valves.

[0057] Continuing to refer to Figure 3 and according to Figure 4 the control architecture block diagram of the power generation system shown, the operations of the flow valves 21 - 25 and the heat recovery flow valve 26 are as follows. The input parameters of the gas turbine control unit 30 are the gas turbine parameters 31, the combustion parameters 32 and the NOx demand 33. The total amount of gas fed into the gas turbine as the sum of the gas NH3 / H2 / N2 mixture flow (m1) through the gas turbine feed line 1, the gas NH3 feed flow line 2 and the gas N2 feed flow (m3) through the gas N2 feed flow line 3 is a function of the gas turbine parameters:

[0058] m1 + m2 + m3 = f(GT parameters)

[0059] The volume composition of the gas NH3 / H2 / N2 mixture flow in the gas turbine feed line 1 (represented by the reference numeral 34 in Figure 2 ); the ratio 35 of the mass flow rate m2 of gas NH3 through the gas NH3 feed flow line 2 to the total mass flow rate of the NH3 / H2 / N2 mixture flow m1 through the gas turbine feed line 1 and the gas NH3 feed flow m2 through the gas NH3 feed flow line 2 to the gas turbine; and the ratio 36 of the mass flow rate of gas N2 through the gas N2 feed flow line 3 to the total mass flow rate of the NH3 / H2 / N2 mixture flow through the gas turbine feed line 1 and the gas NH3 feed flow through the gas NH3 feed flow line 2 to the gas turbine are all functions of the combustion parameters and the NOx requirement:

[0060] x 1i = f(combustion parameters; NOx requirement)

[0061] m2 / (m1 + m2) = f(combustion parameters; NOx requirement)

[0062] m3 / (m1 + m2) = f(combustion parameters; NOx requirement)

[0063] These parameters are inputs to the auxiliary control unit 37, which controls the operation of the flow valves 21 - 25 and the heat recovery flow valve 26 according to the following conditions. The operation Y of the gas flow valve 21 that controls the amount of the gas NH3 / H2 / N2 mixture flow flowing inside the gas turbine feed line 1 21 is a function of the total amount of gas fed to the gas turbine through the gas turbine feed line 1 (m1), the gas NH3 feed flow line 2 (m2), and the gas N2 feed flow line 3 (m3):

[0064] Y 21 = f(m1 + m2 + m3)

[0065] The operation Y of the gas NH3 bypass flow valve 22 22 is a function of the ratio 35 of the mass flow rate of gas NH3 through the gas NH3 feed flow line 2 to the total mass flow rate of the NH3 / H2 / N2 mixture flow through the gas turbine feed line 1 and the gas NH3 feed flow through the gas NH3 feed flow line 2 to the gas turbine:

[0066] Y 22 = f(m2 / (m1 + m2))

[0067] The operation Y of the gas NH3 bypass diverter valve 23 23is a function of the volume composition of the gaseous NH3 / H2 / N2 mixture stream in the gas turbine feed line 1:

[0068] Y 23 = f(x 1i )

[0069] The operation Y of the gas N2 bypass flow valve 24 24 is also a function of the volume composition of the gaseous NH3 / H2 / N2 mixture stream in the gas turbine feed line 1:

[0070] Y 24 = f(x 1i )

[0071] The operation Y of the gas turbine N2 feed flow valve 25 25 is a function of the ratio 36 of the mass flow rate m3 of gas N2 through the gas N2 feed flow line 3 to the total mass flow rate of the gaseous NH3 / H2 / N2 mixture stream through the gas turbine feed line 1 and the gaseous NH3 feed flow to the gas turbine through the gas NH3 feed flow line 2:

[0072] Y 25 = f(m3 / (m1 + m2))

[0073] Finally, the operation of the heat recovery flow valve 26 is a function of the volume composition of the gaseous NH3 / H2 / N2 mixture stream in the gas turbine feed line 1:

[0074] Y 26 = f(x 1i )

[0075] The above control method allows changing the fuel composition of the gas turbine and injecting ammonia and nitrogen at any ratio according to any final burner and gas turbine requirements (which are not part of this disclosure).

[0076] For example: If the burner requires a hydrogen-rich fuel but requires a continuous inert fluid (N2) to reduce the flame temperature and increase the power of the gas turbine, then Case 1 of Table 1 below is applicable. If the burner requires a hydrogen-rich fuel but requires continuous separate ammonia injection, then for optimizing NOx emissions, Case 3 of Table 1 is applicable. In the case where the burner does not require a large amount of hydrogen, highly separated ammonia, and highly separated nitrogen, Case 2 of Table 1 is applicable.

[0077] Table 1

[0078]

[0079] Continuing to refer to Figure 1 、 Figure 2 、 Figure 3 andFigure 4 , Figure 5 shows a third embodiment of a power generation system using a gas turbine and including an ammonia cracking device. The same reference numerals indicate the same or corresponding parts, elements or components that have been shown and described above in Figure 1 , Figure 2 , Figure 3 and Figure 4 and will not be described again.

[0080] Figure 5 The embodiment shown is different from the embodiment of Figure 3 in that at least a portion of the gas N2 stream from the cracking reactor 300 is not directed to the gas turbine 100 but is collected and used for a different purpose. According to this embodiment, the gas N2 stream outlet line 8 is connected downstream to the gas N2 extraction line 3'. A flow valve 25' is arranged along the gas N2 extraction line 3' to control the nitrogen flow rate from the NH3 cracking reactor 300 to the gas N2 stream outlet line 8 for external use. The control method of this embodiment is different from the control methods described with reference to Figure 3 and Figure 4 in that the operation Y 25 of the flow valve 25' is a function of a requirement that does not form an object of the present invention:

[0081] Y 25' = f(other requirements)

[0082] Continuing to refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 6 shows a fourth embodiment of a power generation system using a gas turbine and including an ammonia cracking device. The same reference numerals indicate the same or corresponding parts, elements or components that have been shown and described above in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 and will not be described again.

[0083] Figure 6 The embodiment shown is different from Figure 3 and Figure 5The embodiment differs in that the injection points of the gas turbine feed line 1 and the gaseous NH3 feed stream line 2 are exchanged. Exchanging the injection points may be necessary to account for different combustion technologies applicable to the gas turbine, which have different flame evolutions along the flow path inside the burner. In particular, according to this embodiment, the gas turbine feed line 1 is directed to the secondary of the gas turbine of the gas turbine 100, and the gaseous NH3 feed stream line 2 is directed to the primary of the gas turbine of the gas turbine 100. The control method of this embodiment is the same as that Figure 3 and Figure 4 described with reference to.

[0084] In addition, continuing to refer to Figures 1 to 6 , Figure 7 shows a fifth embodiment of a power generation system using a gas turbine and including an ammonia cracking device. The same reference numerals indicate the same or corresponding parts, elements or components that have been shown and described above in Figures 1 to 6 and will not be described again.

[0085] Figure 7 The embodiment shown is different from the embodiment of Figures 3 to 6 in that at least a portion of the gaseous N2 stream from the cracking reactor 300 is not directed to the gas turbine 100 but is collected and used for different purposes, and the injection points of the gas turbine feed line 1 and the gaseous NH3 feed stream line 2 are exchanged. In particular, according to this embodiment, the gas turbine feed line 1 is directed to the secondary of the gas turbine of the gas turbine 100, and the gaseous NH3 feed stream line 2 is directed to the primary of the gas turbine of the gas turbine 100. In addition, the gaseous N2 stream outlet line 8 is connected downstream to the gaseous N2 extraction line 3'. The control method of this embodiment is the same as that referred to in Figure 5 described.

[0086] Finally, continuing to refer to Figures 1 to 7 , Figure 8 shows a sixth embodiment of a power generation system using a gas turbine and including an ammonia cracking device. The same reference numerals indicate the same or corresponding parts, elements or components that have been shown and described above in Figures 1 to 7 and will not be described again.

[0087] Figure 8 The embodiment shown is different from the embodiment of Figures 3 to 7 in that at least a portion of the gaseous N2 stream from the cracking reactor 300 is not directed to the gas turbine 100 but is directed to the gaseous NH3 feed stream line 2. In particular, according to this embodiment, when needed, at least a portion of the gaseous N2 stream from the cracking reactor 300 is used to purge the gaseous NH3 feed stream line 2.

[0088] Although aspects of the invention have been described in accordance with various specific embodiments, it will be apparent to those of ordinary skill in the art that various modifications, variations and omissions are possible without departing from the spirit and scope of the claims. In addition, unless otherwise indicated herein, the order or sequence of any process or method steps may be altered or re-ordered according to alternative embodiments.

Claims

1. A power generation system, the power generation system comprising a gas turbine (100) and a gas turbine auxiliary system for NH3 regulation, wherein - the gas turbine auxiliary system for NH3 regulation is configured to process an ammonia input stream and obtain a decomposition gas containing at least hydrogen and nitrogen, preferably a gas mixture of NH3 / H2 / N2, - the gas turbine auxiliary system for NH3 regulation includes an ammonia cracking reactor (300), - the ammonia input stream is split into a cracking reactor feed line (6) and an NH3 bypass line (11), - the ammonia cracking reactor (300) is configured to decompose ammonia into a gas mixture of hydrogen and nitrogen or a gas mixture of hydrogen, nitrogen and residual ammonia, - a cracking reactor gas mixture outlet line (7) is connected to the gas turbine (100), - the NH3 bypass flow line (11) is connected to the gas turbine (100) through a gas NH3 feed flow line (2), - the system includes a gas turbine feed line (1) and a plurality of flow valves (21, 22, 23, 24, 25), the plurality of flow valves being controlled by an auxiliary control unit; and wherein - the plurality of flow valves (21, 22, 23, 24, 25) includes a gas flow valve (21) arranged along the gas turbine feed line (1) downstream of the ammonia cracking reactor (300), and / or a gas NH3 bypass flow valve (22) arranged along the gas NH3 feed line (2) connected downstream of the NH3 bypass flow line (11).

2. The power generation system according to claim 1, wherein The ammonia cracking reactor (300) is configured to separate a nitrogen gas stream from a gas mixture of hydrogen and residual nitrogen or a gas mixture of hydrogen, residual nitrogen and residual ammonia.

3. The power generation system according to claim 2, wherein, The nitrogen gas separated from the gas mixture of hydrogen and nitrogen or the gas mixture of hydrogen, nitrogen and residual ammonia is extracted from the ammonia cracking reactor (300) through a nitrogen gas stream line (8), and the nitrogen gas stream line (8) is connected to the gas turbine feed line (1) through a gas nitrogen feed line (9) upstream of the gas turbine (100) and / or connected to the gas turbine (100) through a gas nitrogen feed line (3) and / or connected to a gas N2 extraction line (3').

4. The power generation system according to any one of the preceding claims, the power generation system further comprising a gas NH3 bypass split line (10), the gas NH3 bypass split line being connected upstream to the NH3 bypass flow line (11), downstream to the cracking reactor gas mixture outlet line (7), upstream of the gas turbine (100), to form a gas turbine feed line (1).

5. The power generation system according to any one of the preceding claims, wherein, The NH3 bypass flow is injected into the primary or alternatively the secondary of the gas turbine (100) through the gas NH3 feed line (2).

6. The power generation system according to any one of claims 1 to 5, wherein the power generation system further comprises an NH3 heater / vaporizer / pressurizer (200) configured to heat / vaporize / pressurize at least a portion of a liquid ammonia input stream.

7. The power generation system according to any one of claims 1 to 5, wherein the power generation system further comprises an NH3 pressurizer configured to pressurize a gaseous ammonia input stream.

8. The power generation system according to claim 4, wherein The plurality of flow valves (21, 22, 23, 24, 25) further comprises a gaseous NH3 bypass split flow valve (23) arranged along the gaseous NH3 bypass split pipeline (10).

9. The power generation system according to claim 2, wherein, The plurality of flow valves (21, 22, 23, 24, 25) further comprises a gaseous N2 bypass flow valve (24) arranged along the gaseous N2 bypass pipeline (9) and / or a gas turbine N2 feed flow valve (25) arranged along the gaseous N2 feed flow pipeline (3).

10. The power generation system according to any one of the preceding claims, wherein the power generation system further comprises a heat recovery system configured to recover at least a portion of the exhaust gas flow from the gas turbine (100), the heat recovery system comprising a first heat recovery sub-pipeline (13) configured to transfer a first portion of the exhaust gas flow to the cracking reactor (300) and / or a second heat recovery sub-pipeline (14) configured to transfer a second portion of the exhaust gas flow to the NH3 heater / vaporizer / pressurizer (200).

11. The power generation system according to claim 10, wherein the power generation system further comprises at least one heat recovery flow valve (26).

12. The power generation system according to claim 11, wherein, The at least one heat recovery flow valve (26) is arranged on the first heat recovery sub-pipeline (13) or the second heat recovery sub-pipeline (14).

13. A method for controlling the operation of a power generation system according to any one of the preceding claims 1 to 12, the method comprising the steps of: - determining the total amount (m1 + m2) of the gaseous NH3 / H2 / N2 mixture flow (m1) fed into the gas turbine through the gas turbine feed pipeline (1) and the gaseous NH3 feed flow (m2) through the gaseous NH3 feed flow pipeline (2) as a function of the gas turbine parameters; - Determine (34) the volume composition (x 1i ) of the gaseous NH3 / H2 / N2 mixture stream in the gas turbine feed line (1) and the ratio (35) of the mass flow rate of gaseous NH3 (m2) through the gaseous NH3 feed stream line (2) to the total mass flow rate (m1 + m2) of the gaseous NH3 / H2 / N2 mixture stream (m1) through the gas turbine feed line (1) and the gaseous NH3 feed stream (m2) through the gaseous NH3 feed stream line (2) to the gas turbine as a function of the combustion parameters (32) and the NOx requirement (33); - Determine the operation (Y) of the gas flow valve (21) that determines the amount of the gas NH3 / H2 / N2 mixture flowing inside the gas turbine feed line (1) 21 ) as a function of the total amount (m1 + m2) of the gas flow (m1) fed to the gas turbine through the gas turbine feed line (1) and the gas NH3 feed flow (m2) fed to the gas turbine through the gas NH3 feed line (2); and - Determine the operation of the gas NH3 bypass flow valve 22 (Y 22 ) as a function of the ratio (35) of the mass flow rate (m2)+ of the gas NH3 through the gas NH3 feed flow line (2) to the total mass flow rate (m1 + m2) of the gas NH3 / H2 / N2 mixture flow (m1) through the gas turbine feed line (1) and the gas NH3 feed flow (m2) of the gas NH3 through the gas NH3 feed flow line (2) to the gas turbine.

14. The method for controlling the operation of a power generation system according to claim 13, the method further comprising the steps of: - Determine the operation (Y 26 ) of the heat recovery flow valve (26) as a function of the volumetric composition (x 1i ) of the gas.

15. A method for controlling the operation of a power generation system according to any one of the preceding claims 1 to 12, the method comprising the steps of: - determining the total amount (m1 + m2 + m3) of the gas fed into the gas turbine (100) by the NH3 / H2 / N2 mixture flow (m1) through the gas turbine feed pipeline (1), the gaseous NH3 feed flow (m2) through the gaseous NH3 feed flow pipeline (2), and the gaseous N2 feed flow (m3) through the gaseous N2 feed flow pipeline (3) as a function of the gas turbine parameters; - Determine (34) the volume composition (x 1i ) of the gaseous NH3 / H2 / N2 mixture stream in the gas turbine feed line (1), the ratio (35) of the mass flow rate (m2) of gaseous NH3 through the gaseous NH3 feed stream line (2) to the total mass flow rate (m1 + m2) of the gaseous NH3 / H2 / N2 mixture stream (m1) through the gas turbine feed line (1) and the gaseous NH3 feed stream (m2) through the gaseous NH3 feed stream line (2), and the ratio (36) of the mass flow rate (m3) of gaseous N2 through the gaseous N2 feed stream line (3) to the total mass flow rate (m1 + m2) of the gaseous NH3 / H2 / N2 mixture stream (m1) through the gas turbine feed line (1) and the gaseous NH3 feed stream (m2) through the gaseous NH3 feed stream line (2) as a function of the combustion parameters and NOx requirements; - Determine the operation (Y) of the gas flow valve (21) that determines the amount of the NH3 / H2 / N2 gas mixture flowing inside the gas turbine feed line (1) 21 ) is a function of the total amount of gas flow (m1 + m2 + m3) fed to the gas turbine by the NH3 / H2 / N2 gas mixture flow (m1) through the gas turbine feed line (1), the NH3 gas feed flow (m2) fed to the gas turbine through the gas NH3 feed line (2), and the N2 gas feed flow (m3) through the gas N2 feed flow line (3); - Determine the operation (Y 22 ) of the gas NH3 bypass flow valve (22) as a function of the ratio (35) of the mass flow rate (m2) of the gas NH3 through the gas NH3 feed flow line (2) to the total mass flow rate (m1 + m2) of the gas NH3 / H2 / N2 mixture flow (m1) through the gas turbine feed line (1) and the gas NH3 feed flow (m2) through the gas NH3 feed flow line (2) to the gas turbine; - Determine the operation (Y) of the gas N2 bypass flow valve (24) 24 ) as a function of the volume composition (x 1i ) of the gas NH3 / H2 / N2 mixture flow in the gas turbine feed line (1); - Determine the operation of the gas turbine N2 feed flow valve (25) (Y 25 ) as a function of the ratio (36) of the mass flow rate (m3) of the gas N2 through the gas N2 feed flow line (3) to the total mass flow rate (m1 + m2) of the gas NH3 / H2 / N2 mixture flow (m1) through the gas turbine feed line (1) and the gas NH3 feed flow (m2) of the gas NH3 through the gas NH3 feed flow line (2) to the gas turbine.

16. The method for controlling the operation of a power generation system according to claim 15, the method further comprising the steps of: - Determine the operation (Y 26 ) of the heat recovery flow valve (26) as a function of the volumetric composition of the gas.

17. A method for controlling the operation of a power generation system according to any one of the preceding claims 1 to 12, the method comprising the steps of: - determining the total amount (m1 + m2 + m3) of gas fed into the gas turbine (100) by the NH3 / H2 / N2 mixture flow (m1) through the gas turbine feed line (1), the gaseous NH3 feed flow (m2) through the gaseous NH3 feed line (2), and the gaseous N2 feed flow (m3) through the gaseous N2 feed line (3) as a function of the gas turbine parameters; - determining the volume composition (34) of the gaseous NH3 / H2 / N2 mixture flow in the gas turbine feed line (1), the ratio (35) of the mass flow rate (m2) of the gaseous NH3 through the gaseous NH3 feed line (2) to the total mass flow rate (m1 + m2) of the gaseous NH3 / H2 / N2 mixture flow (m1) through the gas turbine feed line (1) and the gaseous NH3 feed flow (m2) through the gaseous NH3 feed line (2), and the ratio (36) of the mass flow rate (m3) of the gaseous N2 through the gaseous N2 feed line (3) to the total mass flow rate (m1 + m2) of the gaseous NH3 / H2 / N2 mixture flow (m1) through the gas turbine feed line (1) and the gaseous NH3 feed flow (m2) through the gaseous NH3 feed line (2) as a function of the combustion parameters and the NOx requirement; - Determine the operation (Y) of the gas flow valve (21) that determines the amount of the NH3 / H2 / N2 gas mixture flowing inside the gas turbine feed line (1) 21 ) is a function of the total amount (m1 + m2 + m3) of the gas flow fed to the gas turbine by the NH3 / H2 / N2 gas mixture flow (m1) through the gas turbine feed line (1), the NH3 gas feed flow (m2) fed to the gas turbine through the gas NH3 feed line (2), and the N2 gas feed flow (m3) through the gas N2 feed flow line (3); - Determine the operation (Y 22 ) of the gas NH3 bypass flow valve (22) as a function of the ratio (35) of the mass flow rate (m2) of the gas NH3 through the gas NH3 feed flow line (2) to the total mass flow rate (m1 + m2) of the gas NH3 / H2 / N2 mixture flow (m1) through the gas turbine feed line (1) and the gas NH3 feed flow (m2) through the gas NH3 feed flow line (2) to the gas turbine; - Determine the operation (Y 23 ) of the gas NH3 bypass diverter valve (23) as a function of the volume composition (x 1i ) of the gas NH3 / H2 / N2 mixture stream in the gas turbine feed line (1); - Determine the operation (Y 24 ) of the gas N2 bypass flow valve (24) as a function of the volume composition (x 1i ) of the gas NH3 / H2 / N2 mixture flow in the gas turbine feed line (1); - Determine said operation (Y 25 ) of said gas turbine N2 feed stream valve (25) as a function of the ratio (36) of the mass flow rate (m3) of said gas N2 through said gas N2 feed stream line (3) to the total mass flow rate (m1 + m2) of said gas NH3 / H2 / N2 mixed stream (m1) through said gas turbine feed line (1) and said gas NH3 feed stream (m2) of said gas NH3 through said gas NH3 feed stream line (2) to said gas turbine.

18. The method for controlling the operation of a power generation system according to claim 17, the method further comprising the steps of: - Determine the operation (Y 26 ) of the heat recovery flow valve (26) as a function of the volume composition of the gas.

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