Plasma assisted pure ammonia fuel gas turbine system and method of operation thereof

Abstract

The application discloses a kind of plasma auxiliary pure ammonia fuel gas turbine system and its operating method, it is related to ammonia fuel gas turbine technical field.It includes liquid ammonia supply device, staged combustion chamber, gasifier, cracking device, plasma cracker and control system;Liquid ammonia supply device is communicated with staged combustion chamber and gasifier respectively, gasifier is communicated with staged combustion chamber, plasma cracker and cracking device respectively, plasma cracker is communicated with cracking device, and cracking device is communicated with staged combustion chamber;Control system is connected with liquid ammonia supply device, staged combustion chamber, gasifier, cracking device, plasma cracker.The logic of each component connection of the application is clear, layout is reasonable, realizes automation parameter adjustment and process control in combination with control system, convenient to operate, can ensure that pure ammonia fuel gas turbine is in system cold start, hot stable operation, by making full use of gas turbine combustion tail gas, make pure ammonia fuel gas turbine system comprehensive efficiency improve.

Description

Technical Field

[0001] This invention relates to the field of ammonia fuel gas turbine technology, and more particularly to a plasma-assisted pure ammonia fuel gas turbine system and its operation method. Background Technology

[0002] A gas turbine is an internal combustion engine that uses a continuously flowing gas as its working fluid to drive a high-speed rotating impeller, converting the energy of fuel into useful work. It is a type of rotary turbine thermal engine. In the main flow of air and gas, the gas turbine cycle consists of only three main components: the compressor, the combustion chamber, and the gas turbine. This cycle is commonly referred to as a simple cycle, and most gas turbines employ a simple cycle design.

[0003] Ammonia and hydrogen both contain no carbon or sulfur. Using ammonia or hydrogen fuel will completely eliminate carbon-related air pollutants such as black carbon, soot, HC, CO, and CO2. Compared to hydrogen, ammonia has the advantages of higher energy density, easier liquefaction, and easier storage and transportation. Compared to gasoline, it has a higher octane rating and better anti-knock properties. However, ammonia has a high ignition point (651 degrees Celsius), high ignition energy (8 mJ), low flame combustion speed (10 cm / s), and low calorific value (18.8 MJ / kg). Therefore, it requires a high compression ratio or external ignition to ensure the air-fuel mixture is ignited. After combustion, it produces NH3 escape and fuel-type NO. x Emissions have become a major bottleneck restricting the large-scale application of ammonia fuel.

[0004] There are three challenges in combustion systems using ammonia as fuel: firstly, ammonia combustion efficiency is low; secondly, ammonia combustion increases the amount of NO in the fuel. x The formation of liquid ammonia is due to several factors, including its high latent heat of vaporization, which requires a significant amount of heat loss during vaporization. Summary of the Invention

[0005] To address the problems of low combustion efficiency, high emissions, and low energy utilization efficiency of ammonia, this invention proposes a plasma-assisted pure ammonia fuel gas turbine system and its operation method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A plasma-assisted pure ammonia fuel gas turbine system includes a liquid ammonia supply device, a staged combustion chamber, a gasifier, a pyrolysis device, a plasma pyrolysis device, and a control system.

[0008] The liquid ammonia supply device is connected to the staged combustion chamber and the vaporizer, respectively. The vaporizer is connected to the staged combustion chamber, the plasma pyrolyzer and the pyrolysis device, respectively. The plasma pyrolyzer is connected to the pyrolysis device, and the pyrolysis device is connected to the staged combustion chamber. The control system is electrically or communicatively connected to the liquid ammonia supply device, the staged combustion chamber, the vaporizer, the pyrolysis device and the plasma pyrolyzer, respectively.

[0009] The first branch of liquid ammonia of the liquid ammonia supply device enters the staged combustion chamber, and the second branch of liquid ammonia enters the gasifier; the first ammonia gas flowing out of the gasifier enters the staged combustion chamber, the second ammonia gas flowing out of the gasifier enters the plasma cracker and then enters the cracking device, the third ammonia gas flowing out of the gasifier enters the cracking device, and the mixed gas formed by the cracking device enters the staged combustion chamber to participate in combustion.

[0010] The plasma-assisted pure ammonia fuel gas turbine system further comprises a tail gas heat exchanger, the tail gas heat exchanger uses the high-temperature tail gas generated by the staged combustion chamber to heat compressed air to form high-temperature compressed air, and the high-temperature compressed air enters the staged combustion chamber to participate in combustion.

[0011] The tail gas heat exchanger is further in communication with the cracking device, and the plasma-assisted pure ammonia fuel gas turbine system further comprises a gasification heat exchanger and an SCR treatment system, and the gasification heat exchanger is in communication with the cracking device.

[0012] The high-temperature tail gas enters the cracking device after passing through the tail gas heat exchanger, then enters the gasification heat exchanger and then enters the SCR treatment system for denitration treatment, and forms standard tail gas which is discharged into the atmosphere.

[0013] The gasification heat exchanger is further in communication with the gasifier, the heat exchange medium in the gasification heat exchanger exchanges heat with the high-temperature tail gas and then enters the gasifier to heat the second branch of liquid ammonia, and then the heat exchange medium reheats the liquid ammonia supply device.

[0014] A third thermometer is arranged in the medium supply device for providing the heat exchange medium, and an electric heater for heating the heat exchange medium in the initial stage is arranged inside the medium supply device. The heat exchange medium is circulating water from the medium supply device, and the heat exchange medium can also be a high specific heat capacity medium such as oil.

[0015] The fuel in the liquid ammonia supply device is divided into the first branch of liquid ammonia and the second branch of liquid ammonia after passing through a stop valve and a control valve; a liquid ammonia flowmeter is arranged on the liquid ammonia supply first branch through which the first branch of liquid ammonia passes.

[0016] The first ammonia gas directly enters the staged combustion chamber through a second gas flowmeter, the second ammonia gas enters the plasma cracker through the third gas flowmeter, and the third ammonia gas enters the cracking device through a fourth gas flowmeter.

[0017] A first thermometer for monitoring the temperature of the gasifier and a first pressure gauge for monitoring the pressure of the gasifier are arranged in the gasifier; a second thermometer and a second pressure gauge are arranged in the cracking device, wherein the second thermometer is used for monitoring the temperature of the mixed gas output by the cracking device, and the second pressure gauge is used for monitoring the pressure of the mixed gas output by the cracking device; a hydrogen detector for detecting the hydrogen concentration in the mixed gas is further arranged in the cracking device.

[0018] The plasma-assisted pure-ammonia fuel gas turbine system further comprises a display system electrically connected to the control system, and the display system is configured to display parameters.

[0019] The plasma power source of the plasma cracker is any one of a direct current power source, a high-frequency power source, a radio frequency power source, or a microwave power source, and the working mode of the plasma power source is a continuous mode or a pulse modulation mode; the plasma cracker is capable of being coupled with a catalyst;

[0020] The structure of the cracking device is a tube plate type, a tube shell type, a partition wall type, a micro-channel type, a hybrid type, or a heat storage type, and the cracking device is capable of being coupled with a catalyst;

[0021] The catalyst is a mixture of one or more of a metal catalyst and an alloy catalyst;

[0022] The staged combustion chamber is air staging or ammonia fuel staging or a combination of both; the ammonia fuel staging is ammonia cracking gas staging, ammonia gas staging, or liquid ammonia fuel staging, or any combination thereof.

[0023] The operation method of the plasma-assisted pure-ammonia fuel gas turbine system comprises the following steps:

[0024] S1: opening the stop valve and the control valve, and supplying ammonia to the plasma-assisted pure-ammonia fuel gas turbine system;

[0025] S2: setting the power of the plasma power source, and starting the plasma cracker;

[0026] S3: adjusting the power of the plasma power source and the ammonia flow rate;

[0027] S4: when the hydrogen concentration of the plasma cracker reaches a set value, step S5 is executed, otherwise, the power of the plasma power source and the ammonia flow rate are adjusted in step S3;

[0028] S5: when the pressure of the cracking device reaches a pressure set value, step S6 is executed, otherwise, the power of the plasma power source and the ammonia flow rate are adjusted in step S3;

[0029] S6: starting the plasma-assisted pure-ammonia fuel gas turbine system, and the plasma-assisted pure-ammonia fuel gas turbine system starts to work;

[0030] S7: judging whether the hydrogen concentration and the pressure of the cracking device are within a preset value range, if yes, step S8 is executed, otherwise, the power of the plasma power source and the ammonia flow rate are adjusted in step S3;

[0031] S8: gradually increasing the turbine rotating speed of the plasma-assisted pure-ammonia fuel gas turbine system;

[0032] S9: judging whether the plasma-assisted pure-ammonia fuel gas turbine system is stably operated, if yes, continuously increasing the turbine rotating speed of the plasma-assisted pure-ammonia fuel gas turbine system until the plasma-assisted pure-ammonia fuel gas turbine system reaches the rated rotating speed, otherwise returning to step S3 to adjust the power of the plasma power supply and the ammonia gas flow.

[0033] Before step S1, a pre-starting step is further included, which comprises the following steps:

[0034] S01: issuing an instruction through a control system to complete a system self-checking, if the self-checking is unqualified, stopping operation and repairing the system;

[0035] S02: after the self-checking is qualified, starting an electric heater of a medium supply device, if the temperature table in the medium supply device shows lower than room temperature within 1 minute, stopping operation and repairing the system;

[0036] S03: when the temperature table in the medium supply device shows higher than room temperature, starting a circulating pump, adjusting the heat exchange medium flow to a set starting flow, and the set starting flow of the heat exchange medium is not more than 100 m 3 / min.

[0037] The power of the plasma power supply is 0-100 kW.

[0038] The set value of the hydrogen concentration in step S4 is 30%-50%, and the preset value of the hydrogen concentration in step S7 is 20%-40%.

[0039] The pressure set value in step S5 is 3-100 atm, and the pressure preset value in step S7 is 3-100 atm.

[0040] The beneficial effects of the present application are as follows:

[0041] (1) The present application sets a gas turbine system composed of a liquid ammonia supply device, a vaporizer, a cracking device, a staged combustion chamber, a plasma cracker and the like, the connection logic of each component is clear and the layout is reasonable, and the automatic parameter adjustment and process control are realized in combination with a control system, so that the operation is convenient, and the pure-ammonia fuel gas turbine can be ensured to be cold-started and stably operated in a hot state, and the comprehensive efficiency of the pure-ammonia fuel gas turbine system is improved through full utilization of the combustion tail gas of the gas turbine.

[0042] (2) The present application first realizes cold starting through plasma cracking, the residual heat generated after plasma cracking can start the cracking device, and then the stable operation of the pure-ammonia fuel gas turbine is realized through thermal cracking of the cracking device. In addition, fuel adjustment can be realized through the plasma cracker.

[0043] (3) The application is provided with a staged combustion chamber to realize fuel staged combustion, thereby expanding the application range of pure ammonia fuel gas turbine.

[0044] (4) The application further cooperates with the hydrogen concentration monitoring system (hydrogen detector) and the flow control unit to adjust the stability of the ammonia fuel supply system and the operation stability of the gas turbine, and has strong scene adaptability; the system realizes parameter accurate control and automatic operation, shortens the processing period, and improves the processing efficiency.

[0045] (5) The various device components of the application adopt modular design, and the types or quantities of the plasma cracker system, cracker, gasifier and other components can be expanded according to requirements, and good scalability is achieved.

[0046] (6) The plasma-assisted pure ammonia fuel gas turbine system of the application has strong scene adaptability, environmental protection, high efficiency and easy scalability by means of the cascade control system, automatic control and power regulation of the plasma power supply, and guarantees convenient operation and uniform and stable gas turbine starting and operation, provides a reliable solution for the pure ammonia gas turbine system, and promotes industrial application. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 The application provides a structure schematic diagram of a plasma-assisted pure ammonia fuel gas turbine system;

[0048] Figure 2 The application provides a flow schematic diagram of a running method of a plasma-assisted pure ammonia fuel gas turbine system;

[0049] Among them, the reference signs are: 01, liquid ammonia supply device; 02, stop valve; 03, control valve; 04, gasifier; 05, fourth gas flow meter; 06, cracking device; 07, staged combustion chamber; 08, tail gas heat exchanger; 09, liquid ammonia flow meter; 10, high-temperature tail gas; 11, first thermometer; 12, first pressure gauge; 13, second gas flow meter; 14, plasma cracker; 15, second thermometer; 16, second pressure gauge; 17, high-temperature compressed air; 18, third gas flow meter; 19, circulating water; 20, gasification heat exchanger; 21, hydrogen detector; 22, turbine; 23, compressed air; 24, medium supply device; 25, circulating pump; 26, liquid flow meter; 27, SCR treatment system; 28, fresh air; 29, third thermometer; 30, standard tail gas; 31, control system; 32, display system. DETAILED DESCRIPTION

[0050] The technical solutions of the application will be described clearly and completely in combination with the drawings, obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments.

[0051] The components of the embodiments of the application described and illustrated herein can be arranged and designed in a wide variety of different configurations. Therefore, the following detailed description of the embodiments of the application, as provided in the accompanying drawings, is not intended to limit the scope of the application, but is merely representative of selected embodiments of the application.

[0052] All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present application without creative work shall fall within the scope of protection of the present application.

[0053] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present application, it should be noted that unless otherwise explicitly specified, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] Referring to Figure 1 A plasma-assisted pure ammonia fuel gas turbine system includes a liquid ammonia supply device 01, a staged combustion chamber 07, a gasifier 04, a cracking device 06, a plasma cracker 14, an exhaust gas heat exchanger 08, a gasification heat exchanger 20 and a control system 31. The gasifier is used to gasify the liquid ammonia supplied by the liquid ammonia supply device 01.

[0056] Among them, the liquid ammonia supply device 01 is in communication with the staged combustion chamber 07 and the gasifier 04 respectively, the gasifier 04 is in communication with the staged combustion chamber 07, the plasma cracker 14 and the cracking device 06 respectively, the plasma cracker 14 is in communication with the cracking device 06, and the cracking device 06 is in communication with the staged combustion chamber 07; the control system 31 is electrically connected or communicatively connected with the liquid ammonia supply device 01, the staged combustion chamber 07, the gasifier 04, the cracking device 06, the plasma cracker 14 respectively.

[0057] The first branch of liquid ammonia of the liquid ammonia supply device 01 enters the staged combustion chamber 07, and the second branch of liquid ammonia enters the gasifier 04; the first route of ammonia gas flowing out of the gasifier 04 enters the staged combustion chamber 07, the second route of ammonia gas flowing out of the gasifier 04 enters the plasma cracker 14 and then enters the cracking device 06, the third route of ammonia gas flowing out of the gasifier 04 enters the cracking device 06, and the mixed gas formed by the cracking device 06 enters the staged combustion chamber 07 to participate in combustion.

[0058] Specifically, the liquid ammonia supply device 01 provides fuel for the gas turbine system, and the fuel is divided into two routes after passing through the stop valve 02 and the control valve 03; the first branch of liquid ammonia directly enters the staged combustion chamber 07 via the liquid ammonia flow meter 09, and the second branch of liquid ammonia enters the gasifier 04; the ammonia gas flowing out of the gasifier 04 is divided into three routes; the first route of ammonia gas directly enters the staged combustion chamber 07 via the second gas flow meter 13, the second route of ammonia gas enters the plasma cracker 14 via the third gas flow meter 18, and then enters the cracking device 06, and the third route of ammonia gas enters the cracking device 06 via the fourth gas flow meter 05; the ammonia gas is cracked via the cracking device 06 to form mixed gas rich in hydrogen, and the mixed gas enters the staged combustion chamber 07 to participate in organized combustion.

[0059] Preferably, the plasma cracker of the present application is a plasma cracking, and the cracking device is a thermal cracking.

[0060] The tail gas heat exchanger 08 utilizes the high-temperature tail gas 10 generated by the staged combustion chamber 07 to heat the compressed air 23 to form high-temperature compressed air 17, and the high-temperature compressed air 17 enters the staged combustion chamber 07 to participate in combustion.

[0061] Specifically, the high-temperature tail gas 10 formed after combustion heats the compressed air 23 via the tail gas heat exchanger 08; the compressed air 23 is generated by rotating the turbine 22 to compress fresh air 28; the compressed air 23 forms high-temperature compressed air 17 after passing through the tail gas heat exchanger 08; the high-temperature compressed air 17 enters the staged combustion chamber 07 to form ammonia fuel and air staged organized combustion with the mixed gas rich in hydrogen, the first route of ammonia gas, and the first branch of liquid ammonia.

[0062] The liquid ammonia supply device 01 in the embodiment is a liquid ammonia tank.

[0063] Preferably, referring to Figure 1 The tail gas heat exchanger 08 also communicates with the cracking device 06, the plasma-assisted pure ammonia fuel gas turbine system further includes a gasification heat exchanger 20 and an SCR treatment system 27; the gasification heat exchanger 20 communicates with the cracking device 06; the high-temperature tail gas 10 enters the cracking device 06 after passing through the tail gas heat exchanger 08, then enters the gasification heat exchanger 20, and then enters the SCR treatment system 27 for denitration treatment to form a standard tail gas 30 discharged into the atmosphere.

[0064] In this embodiment, the high-temperature tail gas 10 still has a high temperature after heat exchange in the tail gas heat exchanger 08, and is further introduced into the cracking device 06 to provide energy for ammonia cracking, and then is introduced into the gasification heat exchanger 20 to transfer part of the heat to water, and is further introduced into the SCR treatment system 27 for denitration treatment, to form a standard tail gas 30 which is discharged into the atmosphere.

[0065] As a preferred embodiment, referring to Figure 1 , the gasification heat exchanger 20 is also in communication with the gasifier 04, and the heat exchange medium in the gasification heat exchanger 20 exchanges heat with the high-temperature tail gas 10 and then enters the gasifier 04 to heat the second branch of liquid ammonia, and then the heat exchange medium heats the liquid ammonia supply device 01. Preferably, the heat exchange medium is circulating water 19 from the medium supply device 24, and a third thermometer 29 is arranged in the medium supply device 24 to monitor the temperature of the medium supply device 24 in real time.

[0066] An electric heater is arranged in the medium supply device 24 to heat the circulating water 19 in the initial stage. The medium supply device 24 in this embodiment is a water tank, and the heat exchange medium is circulating water 19.

[0067] The medium supply device 24 in this embodiment provides heat exchange medium for the circulating water system, and the water is pressurized by the circulating pump 25 to form a circulation, enters the gasification heat exchanger 20 after the liquid flow meter 26 to exchange heat with the high-temperature tail gas 10 and increase to a suitable temperature range, then enters the gasifier 04 to heat the second branch of liquid ammonia to provide sufficient energy for gasification, then supplies heat to the liquid ammonia supply device 01 through the water pipe to form sufficient pressure for the gas turbine system to provide sufficient ammonia fuel, and finally returns to the medium supply device 24 to form a circulation. The liquid flow meter 26 is used to monitor and control the flow of the circulating water 19.

[0068] Specifically, referring to Figure 1 , the fuel in the liquid ammonia supply device 01 is divided into the first branch of liquid ammonia and the second branch of liquid ammonia after passing through the stop valve 02 and the control valve 03; the liquid ammonia flow meter 09 is arranged on the liquid ammonia supply first branch through which the first branch of liquid ammonia passes. The stop valve 02 is used to quickly cut off the fuel supply when the gas turbine system fails and needs to be shut down urgently, and the control valve 03 is used to control the amount of ammonia fuel entering the gas turbine system. The liquid ammonia flow meter 09 is used to monitor and control the flow of the first branch of liquid ammonia.

[0069] The first route of ammonia gas directly enters the staged combustion chamber 07 through the second gas flow meter 13, the second route of ammonia gas enters the plasma cracker 14 through the third gas flow meter 18, and the third route of ammonia gas enters the cracking device 06 through the fourth gas flow meter 05. The second gas flow meter 13 is used to monitor and control the flow of ammonia gas directly entering the staged combustion chamber 07, the third gas flow meter 18 is used to monitor and control the flow of ammonia gas entering the plasma cracker 14, and the fourth gas flow meter 05 is used to monitor and control the flow of ammonia gas flowing into the cracking device 06.

[0070] A first thermometer 11 for monitoring the temperature of the gasifier 04 and a first pressure gauge 12 for monitoring the pressure of the gasifier 04 are arranged in the gasifier 04; a second thermometer 15 for monitoring the temperature of the mixed gas output by the cracking device 06 and a second pressure gauge 16 for monitoring the pressure of the mixed gas output by the cracking device 06 are arranged in the cracking device 06; and a hydrogen detector 21 for detecting the concentration of hydrogen in the mixed gas is also arranged in the cracking device 06.

[0071] The control system 31 is electrically connected to the shut-off valve 02, the fourth gas flow meter 05, the liquid ammonia flow meter 09, the first thermometer 11, the first pressure gauge 12, the second gas flow meter 13, the third gas flow meter 18, the second thermometer 15, the second pressure gauge 16, the medium supply device 24, the circulating pump 25, the liquid flow meter 26, the third thermometer 29, the SCR treatment system 27, the turbine 22, and the like.

[0072] More preferably, the plasma-assisted pure ammonia fuel gas turbine system further comprises a display system 32 electrically connected to the control system 31, and the display system 32 is used to display system temperature, pressure, gas flow, liquid flow, and the like.

[0073] Preferably, the plasma power source used by the plasma cracker 14 is any one of a direct current power source, a high-frequency power source, a radio frequency power source, or a microwave power source, and the working mode of the plasma power source is continuous mode or pulse modulation mode; the plasma cracker 14 can be coupled with a catalyst;

[0074] The structure of the cracking device 06 is a tube plate type, a tube shell type, a partition type, a micro-channel type, a hybrid type, or a regenerative type, and the cracking device 06 can be coupled with a catalyst; the outer shape can be cylindrical or square, and the material can be stainless steel, nickel-based high-temperature alloy, titanium alloy, or Inconel series alloy, etc.

[0075] The catalyst is a mixture of one or more of metal catalysts and alloy catalysts. The catalyst in the plasma cracker 14 and the cracking device 06 can be a transition metal catalyst of Ni-based, Fe-based, Co-based, or a noble metal catalyst of Ru-based, Pt-based, Pd-based, Rh-based, Ag-based, or a mixture or alloy of two or more catalysts, and the carrier of the catalyst is diatomite, kaolin, cerium oxide, or activated carbon, silica gel, or glass sheet, glass fiber, or silicon dioxide, titanium dioxide, aluminum oxide, or graphene, carbon nanotube, graphite, high polymer, etc.

[0076] The staged combustion chamber 07 is air staging or ammonia fuel staging or a combination of both; the ammonia fuel staging is ammonia cracking gas staging, ammonia gas staging or liquid ammonia fuel staging, or any combination thereof.

[0077] As shown in Figure 2 The application also provides a method for operating the above-mentioned plasma-assisted pure ammonia fuel gas turbine system, which comprises the following steps:

[0078] S1: open the stop valve 02 and the control valve 03 to supply ammonia to the plasma-assisted pure ammonia fuel gas turbine system;

[0079] S2: set the power of the plasma power supply and start the plasma cracker 14;

[0080] S3: adjust the power of the plasma power supply of the plasma cracker 14 and the ammonia gas flow rate;

[0081] S4: when the hydrogen concentration of the plasma cracker 14 reaches a set value, continue to step S5, otherwise return to step S3 to adjust the power of the plasma power supply and the ammonia gas flow rate;

[0082] S5: when the pressure of the cracking device 06 reaches a pressure set value, continue to step S6, otherwise return to step S3 to adjust the power of the plasma power supply and the ammonia gas flow rate;

[0083] S6: start the plasma-assisted pure ammonia fuel gas turbine system, and the plasma-assisted pure ammonia fuel gas turbine system starts to work;

[0084] S7: determine whether the hydrogen concentration and the pressure of the cracking device 06 are within a preset value range, if yes, continue to step S8, otherwise return to step S3 to adjust the power of the plasma power supply and the ammonia gas flow rate;

[0085] S8: gradually increase the rotational speed of the turbine 22 of the plasma-assisted pure ammonia fuel gas turbine system;

[0086] S9: judging whether the plasma-assisted pure-ammonia fuel gas turbine system is running stably, if yes, continuously increasing the rotating speed of the turbine 22 of the plasma-assisted pure-ammonia fuel gas turbine system until the turbine reaches the rated rotating speed, otherwise returning to step S3 to adjust the power of the plasma power supply and the ammonia flow rate.

[0087] Preferably, before step S1, a pre-starting step is further included, which comprises the following steps:

[0088] S01: issuing an instruction by the control system 31 to complete a system self-check, if the self-check is unqualified, stopping running and repairing the system; the system self-check includes all temperature tables, pressure tables, flow meters, display and control units of the turbine 22, etc.

[0089] S02: after the self-check is qualified, starting the electric heater of the medium supply device 24, if the temperature table of the medium supply device shows lower than room temperature within 1 minute, stopping running and repairing the system;

[0090] S03: when the temperature table of the medium supply device 24 shows higher than room temperature, starting the circulating pump 25, adjusting the circulating water 19 flow rate to the set starting water flow rate, the set starting water flow rate of the circulating water 19 is not greater than 100 m 3 / min.

[0091] More preferably, the power of the plasma power supply is 0-100 kW.

[0092] The set value of the hydrogen concentration in step S4 is 30%-50%, and the preset value of the hydrogen concentration in step S7 is 20%-40%.

[0093] The pressure set value in step S5 is 3-100 atm, and the pressure preset value in step S7 is 3-100 atm.

[0094] Those skilled in the art will readily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0095] The part not described in detail in the specification of the present application is provided by the known technology in the art, and the above embodiments are only for the purpose of describing the present application, and are not intended to limit the scope of the present application. The scope of the present application is defined by the appended claims. Various equivalent replacements and modifications made without departing from the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. A plasma assisted pure ammonia fuel gas turbine system characterized by, The plasma-assisted pure ammonia fuel gas turbine system comprises a liquid ammonia supply device, a staged combustion chamber, a gasifier, a cracking device, a plasma cracker and a control system; The liquid ammonia supply device is in communication with the staged combustion chamber and the gasifier respectively, the gasifier is in communication with the staged combustion chamber, the plasma cracker and the cracking device respectively, the plasma cracker is in communication with the cracking device, and the cracking device is in communication with the staged combustion chamber; the control system is electrically connected or communicatively connected with the liquid ammonia supply device, the staged combustion chamber, the gasifier, the cracking device and the plasma cracker respectively; The first branch of the liquid ammonia supply device enters the staged combustion chamber, and the second branch of the liquid ammonia supply device enters the gasifier; The first path of ammonia gas flowing out of the gasifier enters the staged combustion chamber, the second path of ammonia gas flowing out of the gasifier enters the plasma cracker and then enters the cracking device, the third path of ammonia gas flowing out of the gasifier enters the cracking device, and the mixed gas formed by the cracking device enters the staged combustion chamber to participate in combustion; The plasma-assisted pure ammonia fuel gas turbine system further comprises a tail gas heat exchanger, the tail gas heat exchanger uses high-temperature tail gas generated by the staged combustion chamber to heat compressed air to form high-temperature compressed air, and the high-temperature compressed air enters the staged combustion chamber to participate in combustion; the tail gas heat exchanger is also in communication with the cracking device, and the plasma-assisted pure ammonia fuel gas turbine system further comprises a gasification heat exchanger and an SCR treatment system, and the gasification heat exchanger is in communication with the cracking device; The high-temperature tail gas enters the cracking device after passing through the tail gas heat exchanger, then enters the gasification heat exchanger, and then enters the SCR treatment system for denitration treatment to form standard tail gas which is discharged into the atmosphere; the gasification heat exchanger is also in communication with the gasifier, and the heat exchange medium in the gasification heat exchanger exchanges heat with the high-temperature tail gas and then enters the gasifier to heat the second branch of the liquid ammonia, and then the heat exchange medium reheats the liquid ammonia supply device; The fuel in the liquid ammonia supply device is divided into the first branch of the liquid ammonia and the second branch of the liquid ammonia after passing through a stop valve and a control valve; a liquid ammonia flowmeter is arranged on the first branch of the liquid ammonia supply device through which the first branch of the liquid ammonia passes; The first path of ammonia gas directly enters the staged combustion chamber through a second gas flowmeter, the second path of ammonia gas enters the plasma cracker through a third gas flowmeter, and the third path of ammonia gas enters the cracking device through a fourth gas flowmeter; A first thermometer for monitoring the temperature of the gasifier and a first pressure gauge for monitoring the pressure of the gasifier are arranged in the gasifier; A second thermometer and a second pressure gauge are arranged in the cracking device, wherein the second thermometer is used for monitoring the temperature of the mixed gas output by the cracking device, and the second pressure gauge is used for monitoring the pressure of the mixed gas output by the cracking device; a hydrogen detector for detecting the hydrogen concentration in the mixed gas is also arranged in the cracking device; The plasma power source of the plasma cracker is any one of a direct current power source, a high-frequency power source, a radio frequency power source or a microwave power source, and the working mode of the plasma power source is continuous mode or pulse modulation mode; the plasma cracker can be coupled with a catalyst; The structure of the cracking device is a tube plate type, a tube shell type, a partition type, a micro-channel type, a mixed type or a heat storage type, and the cracking device can be coupled with a catalyst; The catalyst is a mixture of one or more of a metal catalyst and an alloy catalyst. The staged combustion chamber is air staging or ammonia fuel staging or a combination of both; the ammonia fuel staging is ammonia cracking gas staging, ammonia gas staging or liquid ammonia fuel staging, or any combination thereof.

2. The plasma-assisted pure-ammonia fuel gas turbine system of claim 1, wherein, A third thermometer is arranged in the medium supply device for providing the heat exchange medium; an electric heater is arranged inside the medium supply device for heating the heat exchange medium in a starting stage.

3. The plasma-assisted pure-ammonia fuel gas turbine system of claim 1 or 2, wherein, The plasma-assisted pure ammonia fuel gas turbine system further comprises a display system electrically connected with the control system, and the display system is used for displaying parameters.

4. The method of operating a plasma-assisted pure-ammonia fuel gas turbine system according to any one of claims 1 to 3, characterized in that The method comprises the following steps: S1: opening the stop valve and the control valve, and supplying ammonia to the plasma-assisted pure ammonia fuel gas turbine system; S2: setting the power of the plasma power supply, and starting the plasma cracker; S3: adjusting the power of the plasma power supply and the ammonia flow rate; S4: when the hydrogen concentration of the plasma cracker reaches a set value, executing step S5, otherwise returning to step S3 to adjust the power of the plasma power supply and the ammonia flow rate; S5: when the pressure of the cracking device reaches a pressure set value, executing step S6, otherwise returning to step S3 to adjust the power of the plasma power supply and the ammonia flow rate; S6: starting the plasma-assisted pure ammonia fuel gas turbine system, and the plasma-assisted pure ammonia fuel gas turbine system starts to work; S7: judging whether the hydrogen concentration and the pressure of the cracking device are within a preset value range, if yes, executing step S8, otherwise returning to step S3 to adjust the power of the plasma power supply and the ammonia flow rate; S8: gradually increasing the turbine rotating speed of the plasma-assisted pure ammonia fuel gas turbine system; S9: judging whether the plasma-assisted pure ammonia fuel gas turbine system is in stable operation, if yes, continuously increasing the turbine rotating speed of the plasma-assisted pure ammonia fuel gas turbine system until the plasma-assisted pure ammonia fuel gas turbine system reaches a rated rotating speed, otherwise returning to step S3 to adjust the power of the plasma power supply and the ammonia flow rate.

5. The method of operating a plasma-assisted pure-ammonia fuel gas turbine system of claim 4, wherein, Before step S1, a pre-starting step is further included, and the pre-starting step comprises the following steps: S01: issuing an instruction through the control system, completing system self-checking, and stopping operation and repairing the system if the self-checking is unqualified; S02: after the self-checking is qualified, starting the electric heater of the medium supply device, and stopping operation and repairing the system if the temperature table in the medium supply device shows a temperature lower than room temperature within 1 minute; S03: when the temperature table in the medium supply device shows higher than room temperature, start the circulating pump, adjust the heat exchange medium flow to the set starting flow, the set starting flow of the heat exchange medium is not more than 100 m 3 / min.

6. The method of operating a plasma-assisted pure-ammonia fuel gas turbine system of claim 5, wherein, The power of the plasma power supply is 0-100 kW; The set value of the hydrogen concentration in step S4 is 30%-50%, and the preset value of the hydrogen concentration in step S7 is 20%-40%; The pressure set value in step S5 is 3-100 atm, and the pressure preset value in step S7 is 3-100 atm.

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