A control system and method for hydrogen supplementation combustion in a gas turbine waste heat boiler

Abstract

The present application relates to a control system and method for hydrogen supplementation combustion in a gas turbine waste heat boiler, wherein the system includes a natural gas supply module and a hydrogen supply module through a gas supply device, and the natural gas supply module and the hydrogen supply module transport natural gas and hydrogen to a combustion device. The combustion device includes a natural gas combustion module for burning natural gas and a hydrogen combustion module for burning hydrogen. The control device includes a natural gas and hydrogen coordination module and a gas turbine supplementary combustion coordination module; the calculation module is used to calculate the gas turbine operating parameters after hydrogen supplementation, the natural gas and hydrogen coordination module is used to determine the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine operating parameters, and the gas turbine supplementary combustion coordination module is used to control the output of natural gas and hydrogen according to the gas turbine load change and the grid dispatching instructions. The problem of low energy utilization efficiency in the hydrogen supplementation combustion control system in the related art is solved. Safe and efficient hydrogen supplementation combustion is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of gas turbine supplementary combustion power generation, and in particular to a control system and method for hydrogen supplementary combustion in a gas turbine waste heat boiler. Background Art

[0002] Gas turbine combined cycle units have gradually become an important form of power supply in the domestic power generation field due to their advantages such as high energy utilization, multi-energy supply, convenient peak load regulation, environmental friendliness and small footprint. With the global pursuit of green and low-carbon transformation and the restrictions on natural gas prices, the gas turbine industry is gradually transforming to burning hydrogen-blended or even pure hydrogen. However, this transformation faces many technical and safety challenges.

[0003] The research on hydrogen blending in the gas turbine industry is mainly focused on the gas turbine body, which requires the modification of the combustion chamber and some auxiliary components, while taking into account the combustion performance and safety performance to avoid hydrogen embrittlement, hydrogen explosion, hydrogen leakage and other problems. These problems not only increase the modification cost of the equipment, but also limit the energy utilization efficiency of the gas turbine.

[0004] At present, the hydrogen replenishment combustion technology in waste heat boilers is still in its infancy, and its hydrogen replenishment combustion control system has the problem of low energy utilization efficiency. Summary of the invention

[0005] The embodiments of the present application provide a control system and method for hydrogen replenishment combustion in a gas turbine waste heat boiler, so as to at least solve the problem of low energy utilization efficiency of hydrogen replenishment combustion control systems in related technologies.

[0006] In a first aspect, an embodiment of the present application provides a control system for hydrogen supplementation combustion in a gas turbine waste heat boiler, the system comprising:

[0007] The system comprises a gas supply device, a combustion device and a control device; wherein,

[0008] The gas supply device comprises a natural gas supply module and a hydrogen gas supply module, and the natural gas supply module and the hydrogen gas supply module transport natural gas and hydrogen to the combustion device;

[0009] The combustion device comprises a natural gas combustion module for burning the natural gas and a hydrogen combustion module for burning the hydrogen;

[0010] The control device includes a calculation module, a natural gas and hydrogen coordination module, and a gas turbine supplementary combustion coordination module; the calculation module is used to calculate the gas turbine operating parameters after hydrogen supplementation, the natural gas and hydrogen coordination module is used to determine the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine operating parameters, and the gas turbine supplementary combustion coordination module is used to peak-shave the gas turbine preheating boiler by controlling the output of the natural gas and hydrogen according to the gas turbine load changes and power grid dispatching instructions.

[0011] In one embodiment, the gas supply device further comprises:

[0012] Cooling air supply module, used for natural gas ignition and combustion support, natural gas ignition and main burner fire detection cooling, hydrogen main burner fire detection cooling;

[0013] Flue gas recirculation module, used for combustion support of natural gas large flare main burner and hydrogen main burner;

[0014] Air supply module, used for combustion support of hydrogen main burner;

[0015] The nitrogen supply module is used to purge the entire pipeline network with nitrogen before starting and after shutting down the hydrogen burner.

[0016] In one embodiment, the natural gas combustion module includes an ignition burner, a large flare main burner and a small flare main burner, wherein the large flare main burner and the small flare main burner are burned by the ignition burner, and the large flare main burner and the small flare main burner are set to be always on;

[0017] The hydrogen combustion module includes a hydrogen burner, a blower, an air pressure switch and an air flow regulator, wherein the blower sucks in combustion-supporting air and delivers it to the hydrogen burner through a pipeline, the air pressure switch is used to monitor the pressure of the combustion-supporting air, and in the case of abnormal pressure, an alarm or shutdown signal will be triggered, and the air flow regulator is used to control the flow of the combustion-supporting air;

[0018] The hydrogen burner comprises a pressure interlock for hydrogen high pressure protection, hydrogen low pressure protection and combustion air low pressure protection.

[0019] In one embodiment, the natural gas and hydrogen coordination module includes a main loop control unit, a secondary loop control unit and a supplementary combustion ratio setting unit; wherein,

[0020] The main loop control unit is based on the outlet steam pressure of the waste heat boiler, and uses a PID controller as the main regulator, and the controlled quantity is the outlet steam pressure of the waste heat boiler; the feedforward signal is the gas turbine power generation power corrected by the exhaust temperature of the waste heat boiler;

[0021] The secondary loop control unit includes a hydrogen afterburning valve opening subunit and a natural gas afterburning valve opening subunit; the output of the main regulator is used as a given value of the secondary regulator, and fed back as hydrogen and natural gas afterburning valve opening measurement values, and the hydrogen and natural gas afterburning valve opening measurement values ​​meet the maximum and minimum flow restrictions; the position signals of the hydrogen and natural gas afterburning valve actuators and the position signal of the hydrogen afterburning valve actuator are output to control the opening of the afterburning valve.

[0022] The refueling ratio setting unit is set through safety mode, economy mode, environmental protection mode and manual mode; wherein,

[0023] The safety mode is set according to the strength of the natural gas and hydrogen fire detection signals;

[0024] The economic model is set according to the combustion costs of natural gas and hydrogen;

[0025] The environmental protection mode is set according to the amount of nitrogen oxides generated when natural gas and hydrogen are burned;

[0026] The manual mode is set according to the volume ratio and mass ratio of hydrogen usage.

[0027] In one embodiment, the gas turbine supplementary combustion coordination module, when adjusting the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine load change and the grid dispatch instruction, is used to:

[0028] When the gas turbine load is reduced to a deep load or the gas turbine load change rate is greater than the deep load change rate, the power grid requires the gas turbine to perform peak load regulation;

[0029] Starting the combustion device according to the gas turbine peak-shaving information;

[0030] After the combustion device passes the self-check, it enters the standby state;

[0031] According to the monitoring feedback signal of the combustion device, the supplementary combustion ratio of the natural gas and hydrogen is determined, and the flow rate of the corresponding fuel regulating valve is automatically adjusted to control the steam pressure or the flue gas temperature to be consistent with the target set value.

[0032] In one embodiment, when calculating the operating parameters of the gas turbine after hydrogen replenishment, the calculation module is used to:

[0033] According to the exhaust gas flow and composition data of the gas turbine, the exhaust temperature and ambient temperature are used for correction, and the oxygen consumption, maximum supplementary combustion amount, minimum supplementary combustion amount, optimal node and approach point deviation under natural gas and hydrogen conditions are calculated respectively to obtain the operating parameters of the gas turbine after hydrogen supplementation; among them,

[0034] The maximum supplementary combustion amount includes the supplementary combustion amount limited by the maximum steam production amount, the supplementary combustion amount limited by the maximum exhaust temperature and the supplementary combustion amount limited by the oxygen content of the flue gas.

[0035] In one embodiment, the control device further includes a start module and a stop module; wherein,

[0036] The starting module is used to safely start the combustion device through combustion mode selection, leakage detection and ignition program control;

[0037] The stop module is used to control the burner through the sectional valve to safely shut down the combustion device.

[0038] In one embodiment, the start-up module is used to:

[0039] Make ignition condition judgment, and if the ignition conditions are met, open the ignition circuit to connect the igniter;

[0040] Perform igniter flame detection and judgment. When the igniter flame meets the requirements, open the main circuit and connect the main burner.

[0041] The flame of the main burner is detected and judged. When the flame of the main burner meets the requirements, the load is increased to stabilize the combustion, and the flameout protection is put into use, and the ignition is completed.

[0042] In one embodiment, the system further comprises a safety device,

[0043] The safety device is used to monitor the state of the combustion device and shut down the combustion device when the combustion is abnormal; wherein,

[0044] The safety device includes an ignition flame detector, a natural gas main burner flame detector, a hydrogen flame detector, a protective cover, and a flame detection cooling unit; the ignition flame detector is used to detect the ignition flame, the natural gas main burner flame detector is used to detect the flame of the natural gas main burner, the hydrogen flame detector is used to detect the flame of the hydrogen main burner, the protective cover is used to protect the burner and related equipment, and the fire detection cooling device is used to cool the flame detector.

[0045] In a second aspect, an embodiment of the present application provides a method for controlling hydrogen replenishment combustion in a gas turbine waste heat boiler, the method being applied to a control system for hydrogen replenishment combustion in a gas turbine waste heat boiler as described in the first aspect above, the method comprising:

[0046] transporting natural gas and hydrogen to a combustion device for combustion;

[0047] According to the exhaust flow and composition data of the gas turbine, the operating parameters of the gas turbine after hydrogen supplementation are obtained;

[0048] Determining the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine operating parameters;

[0049] According to the change of gas turbine load and the dispatching instruction of the power grid, the gas turbine preheating boiler is peak-shifted by controlling the output of the natural gas and hydrogen.

[0050] In a third aspect, an embodiment of the present application provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, a method for controlling hydrogen replenishment combustion in a gas turbine waste heat boiler as described in the first aspect above is implemented.

[0051] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for controlling hydrogen supplementation combustion in a gas turbine waste heat boiler as described in the first aspect above.

[0052] The embodiment of the present application provides a gas turbine waste heat boiler hydrogen replenishment combustion control system and method which has at least the following technical effects.

[0053] The gas supply device includes a natural gas supply module and a hydrogen supply module, and the natural gas supply module and the hydrogen supply module transport natural gas and hydrogen to the combustion device. The combustion device includes a natural gas combustion module for burning natural gas and a hydrogen combustion module for burning hydrogen. The control device includes a calculation module, a natural gas and hydrogen coordination module, and a gas turbine supplementary combustion coordination module; the calculation module is used to calculate the gas turbine operating parameters after hydrogen supplementation, the natural gas and hydrogen coordination module is used to determine the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine operating parameters, and the gas turbine supplementary combustion coordination module is used to control the output of natural gas and hydrogen according to the gas turbine load changes and power grid dispatching instructions, and to peak the gas turbine preheating boiler. Realize the hydrogen supplementation combustion control in the gas turbine waste heat boiler, and solve the problem of low energy utilization efficiency of the hydrogen supplementation combustion control system in the related technology. Realize safe and efficient hydrogen supplementation combustion.

[0054] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0056] Figure 1 This is a structural framework diagram of a hydrogen supplement combustion control system in a gas turbine waste heat boiler;

[0057] Figure 2 An overall structural diagram of a hydrogen supplement combustion control module in a gas turbine waste heat boiler;

[0058] Figure 3 is a logical structure diagram of a natural gas and hydrogen coordination module according to an exemplary embodiment;

[0059] Figure 4 is a logical structure diagram of a gas turbine supplementary combustion coordination module according to an exemplary embodiment;

[0060] Figure 5 is a logical structure diagram of leakage detection according to an exemplary embodiment;

[0061] Figure 6 is a logical structure diagram of ignition program control according to an exemplary embodiment;

[0062] Figure 7 is a logical structure diagram of a stop module according to an exemplary embodiment;

[0063] Figure 8 is a block diagram of a system for controlling hydrogen supplementation combustion in a waste heat boiler of a gas turbine according to an exemplary embodiment;

[0064] Fig. 9 A block diagram of an electronic device is shown according to an exemplary embodiment. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0066] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0067] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0068] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantity limitation, and may indicate the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0069] In a first aspect, an embodiment of the present application provides a control system for hydrogen replenishment combustion in a gas turbine waste heat boiler. Figure 1 This is a structural framework diagram of a hydrogen combustion control system in a gas turbine waste heat boiler. Figure 2 This is an overall structural diagram of the hydrogen combustion control system in the gas turbine waste heat boiler. Figure 1 and Figure 2 As shown, the system includes a gas supply device 110, a combustion device 120 and a control device 130; wherein,

[0070] The gas supply device 110 includes a natural gas supply module and a hydrogen supply module, and the natural gas supply module and the hydrogen supply module transport natural gas and hydrogen to the combustion device;

[0071] The combustion device 120 includes a natural gas combustion module for burning natural gas and a hydrogen combustion module for burning hydrogen;

[0072] The control device 130 includes a calculation module, a natural gas and hydrogen coordination module, and a gas turbine refueling coordination module; the calculation module is used to calculate the gas turbine operating parameters after hydrogen replenishment, the natural gas and hydrogen coordination module is used to determine the refueling ratio of natural gas and hydrogen according to the gas turbine operating parameters, and the gas turbine refueling coordination module is used to peak the gas turbine preheating boiler by controlling the output of natural gas and hydrogen according to the gas turbine load changes and power grid dispatch instructions.

[0073] In summary, the application embodiment provides a control system for hydrogen supplementation combustion in a gas turbine waste heat boiler, wherein the gas supply device includes a natural gas supply module and a hydrogen supply module, and the natural gas supply module and the hydrogen supply module transport natural gas and hydrogen to the combustion device. The combustion device includes a natural gas combustion module for burning natural gas and a hydrogen combustion module for burning hydrogen. The control device includes a calculation module, a natural gas and hydrogen coordination module, and a gas turbine supplementary combustion coordination module; the calculation module is used to calculate the gas turbine operating parameters after hydrogen supplementation, the natural gas and hydrogen coordination module is used to determine the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine operating parameters, and the gas turbine supplementary combustion coordination module is used to control the output of natural gas and hydrogen according to the gas turbine load changes and power grid dispatching instructions, and to peak the gas turbine preheating boiler. Hydrogen supplementation combustion control in the gas turbine waste heat boiler is realized to solve the problem of low energy utilization efficiency of hydrogen supplementation combustion control systems in related technologies. Safe and efficient hydrogen supplementation combustion is realized.

[0074] In one embodiment, if Figure 2 An overall structural diagram of a hydrogen supplement combustion control module in a gas turbine waste heat boiler. The gas supply device includes a natural gas supply module, a hydrogen supply module, a cooling air or instrument air supply module, a flue gas recirculation (FGR) module, an air supply module and a nitrogen supply module, which generally have a manual ball valve, a filter, a pressure reducing valve, a solenoid valve and a check valve. The natural gas supply module includes a supplementary combustion shut-off valve, a self-supporting pressure regulating valve, a main circuit front / rear shut-off valve, a flow regulating valve, a segmented shut-off valve, a flow meter, an ignition circuit front / rear shut-off valve, a main circuit / ignition circuit vent valve, an ignition flame arrester and related detection instruments. The hydrogen supply module includes a supplementary combustion shut-off valve, a self-supporting pressure regulating valve, a main circuit front / rear shut-off valve, a flow regulating valve, a flow meter, a main circuit vent valve, a flame arrester and related detection instruments. Cooling air or instrument air is used for natural gas ignition and combustion support, natural gas ignition and main burner fire detection cooling, and hydrogen main burner fire detection cooling. The flue gas recirculation (FGR) module is used for combustion support of natural gas large flare main burners and hydrogen main burners. The air supply module is used for combustion support of hydrogen main burners. The nitrogen supply module is used to purge the entire pipeline network with nitrogen before starting and after stopping the hydrogen burner to improve the safety of the module.

[0075] The safe transportation and precise control of natural gas and hydrogen are ensured by various valves and detection instruments such as the supplementary combustion shut-off valve, self-supporting pressure regulating valve, flow control valve, etc. The flame arrester design in the hydrogen supply module effectively prevents fire or explosion during the transportation of hydrogen. The nitrogen supply module performs nitrogen purge on the pipeline network before startup and after shutdown to improve the safety of the system and prevent hydrogen accumulation. The cooling air and instrument air provided by the cooling air or instrument air supply module ensure the reliability of the ignition process and the normal operation of the burner. The reliability of ignition and main combustion is ensured by the separation design of the ignition circuit and the main circuit, as well as the real-time monitoring of various detection instruments. The flue gas recirculation (FGR) module reduces the generation of nitrogen oxides, reduces emissions, and improves the environmental performance of the system.

[0076] In one embodiment, the combustion device includes an independent natural gas combustion module and a hydrogen combustion module. The natural gas combustion module includes an ignition burner, a large flare main burner and a small flare main burner, wherein the large flare main burner and the small flare main burner are burned by the ignition burner, and the large flare main burner and the small flare main burner are set to be always on; the hydrogen combustion module includes a hydrogen burner, a fan, an air pressure switch and an air flow regulator, wherein the fan sucks in the combustion air and transports it to the hydrogen burner through a pipeline, the air pressure switch is used to monitor the pressure of the combustion air, and in the case of abnormal pressure, an alarm or shutdown signal will be triggered, and the air flow regulator is used to control the flow of the combustion air; the hydrogen burner includes a pressure interlock for hydrogen high pressure protection, hydrogen low pressure protection and combustion air low pressure protection.

[0077] Alternatively, if Figure 2 As shown, the natural gas combustion module includes an ignition burner, a large and small flare main burner, and the ignition air comes from the cooling air pipe or instrument air. In order to ensure the reliable combustion of the main burner, it is set to be always on. Always on means that before the main burner is started, a small, continuously burning flame is ignited. This flame is called a long-burning flame or a long-burning lamp. The long-burning flame is always in a burning state and can quickly ignite the main burner at any time to ensure the reliable ignition of the main burner. The hydrogen combustion module includes a main burner, a fan, an air pressure switch, an air flow regulating device, etc. Among them, the hydrogen burner is also equipped with 3 pressure protection interlocks: ① Hydrogen high pressure protection to prevent excessive hydrogen from entering the waste heat boiler for combustion, causing an imbalance in the air / fuel ratio and causing an explosion; ② Hydrogen low pressure protection to prevent too little hydrogen from entering the waste heat boiler for combustion, causing excess air, flashback or misfire; ③ Combustion air low pressure protection to prevent deflagration and explosion caused by insufficient combustion air and imbalance in the air / fuel ratio due to fan failure.

[0078] Hydrogen has a high combustion calorific value and a wide combustion range. Mixing it with natural gas can significantly improve combustion efficiency, especially under low load conditions. The addition of hydrogen can improve combustion stability and efficiency. The hydrogen combustion module is equipped with a fan, air pressure switch and air flow regulator, which can accurately control the flow of combustion air, ensure the optimal mixing ratio of hydrogen and air, and further improve combustion efficiency. The hydrogen combustion module is equipped with a pressure interlock of hydrogen high pressure protection, hydrogen low pressure protection and combustion air low pressure protection, which can cut off the hydrogen supply in time under abnormal conditions to prevent safety accidents such as explosions. The long-burning flame design in the natural gas combustion module ensures reliable ignition of the main burner, reduces the risk of ignition failure, and improves the safety of the overall system. By adjusting the flow of combustion air, the combustion intensity can be quickly adjusted to meet the needs under different load conditions.

[0079] In one embodiment, the natural gas and hydrogen coordination module includes a main loop control unit, a secondary loop control unit and a supplementary combustion ratio setting unit; wherein,

[0080] The main loop control unit is based on the outlet steam pressure of the waste heat boiler. The PID controller is used as the main regulator. The controlled variable is the outlet steam pressure of the waste heat boiler. The feedforward signal is the gas turbine power generation power corrected by the exhaust temperature of the waste heat boiler.

[0081] The auxiliary circuit control unit includes a hydrogen afterburning valve opening subunit and a natural gas afterburning valve opening subunit; the output of the main regulator is used as a given value of the auxiliary regulator, and is fed back as the hydrogen and natural gas afterburning valve opening measurement values, and the hydrogen and natural gas afterburning valve opening measurement values ​​meet the maximum and minimum flow restrictions; the position signals of the hydrogen and natural gas afterburning valve actuators and the position signal of the hydrogen afterburning valve actuator are output to control the opening of the afterburning valve.

[0082] The refueling ratio setting unit is set through safety mode, economic mode, environmental protection mode and manual mode; among which,

[0083] Safety mode, set according to the strength of natural gas and hydrogen fire detection signals;

[0084] Economic model, set according to the combustion costs of natural gas and hydrogen;

[0085] Environmental protection mode, which is set according to the amount of nitrogen oxides generated when natural gas and hydrogen are burned;

[0086] Manual mode, set according to the volume ratio and mass ratio of hydrogen.

[0087] Optionally, Figure 3 FIG. 1 is a logical structure diagram of a natural gas and hydrogen coordination module according to an exemplary embodiment. Figure 3As shown in the figure, it is represented by the SAMA diagram of the Scientific Apparatus Maker's Association. The coordinated control adopts a series ratio control scheme with feedforward as a whole, in which the main loop is PID controller, and the controlled quantity is the steam pressure at the outlet of the waste heat boiler, ensuring that the steam pressure is equal to the given value; the two sub-loops are independent hydrogen post-combustion valve opening control loops and natural gas post-combustion valve opening control loops, the given value of the sub-regulator is the output of the main regulator, and the feedback is the hydrogen and natural gas post-combustion valve opening measurement value, both of which are PI control, and have maximum / minimum flow restrictions, and the outputs are natural gas and hydrogen post-combustion valve actuator position signals (the flow size of natural gas and hydrogen post-combustion valves); the feedforward signal is the gas turbine power generation corrected by the waste heat boiler exhaust temperature, to achieve early action of the post-combustion valve.

[0088] The ratio of natural gas / hydrogen coordinated control is achieved through the settings of F1(x) and F2(x), and the supplementary combustion ratio ( Figure 3 Four different modes can be set: mode 1 is the safety mode, which is the default mode and is automatically set according to the natural gas and hydrogen fire detection signal strength; mode 2 is the economic mode, which is automatically set according to the natural gas and hydrogen combustion costs; mode 3 is the environmental protection mode, which is automatically set considering the amount of nitrogen oxides generated when natural gas and hydrogen are burned; mode 4 is the manual mode, which manually sets the hydrogen blending ratio mode, and can use volume ratio and mass ratio. Through different mode settings, the supplementary combustion ratio can be optimized to meet different operating requirements. Among them, Figure 3 Among them, ①, ②, ③ and ④ correspond to modes 1 to 4.

[0089] Specifically, the control target of the main loop control unit is the outlet steam pressure of the waste heat boiler. The control method is to use a PID controller as the main regulator, and the controlled quantity is the outlet steam pressure of the waste heat boiler. The feedforward signal is the gas turbine power generation corrected by the exhaust temperature of the hot boiler. The function is to ensure that the outlet steam pressure of the waste heat boiler is equal to the given value, and to improve the response speed and stability of the system. The control object of the secondary loop control unit is the opening of the hydrogen supplementary combustion valve and the opening of the natural gas supplementary combustion valve. The control method is to use the output of the main regulator as the given value of the secondary regulator. The feedback is the measured value of the opening of the hydrogen and natural gas supplementary combustion valves. The control type is PI control, with maximum and minimum flow limits. The output is the position signal of the hydrogen and natural gas supplementary combustion valve actuators to control the opening of the supplementary combustion valves.

[0090] The main loop adopts PID controller to ensure accurate control of the steam pressure at the outlet of the waste heat boiler and improve the stability and response speed of the system. The gas turbine power corrected by the exhaust temperature of the waste heat boiler is used as a feedforward signal to realize the advance action of the supplementary combustion valve, further improving the response speed of the system. It is automatically set according to the strength of the natural gas and hydrogen fire detection signals to ensure the safety of the combustion process and prevent safety accidents caused by ignition failure or incomplete combustion. The secondary loop control unit has maximum and minimum flow limits to prevent unstable combustion or equipment damage caused by abnormal flow. The supplementary combustion ratio is automatically set according to the combustion cost of natural gas and hydrogen to optimize fuel use and reduce operating costs. Through the manual mode, the hydrogen blending set value can be manually set according to actual needs to achieve flexible economic control. The hydrogen burner has a fast startup speed and can reach full load operation in a short time. It is suitable for responding to rapid changes in electricity demand and improving the peak-shaving capacity of the system. Through the secondary loop control unit, the opening of the hydrogen and natural gas supplementary combustion valves can be flexibly adjusted to meet the needs under different load conditions.

[0091] In one embodiment, the gas turbine supplementary combustion coordination module is used to adjust the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine load change and the grid dispatch instruction:

[0092] When the gas turbine load is reduced to a deep load or the gas turbine load change rate is greater than the deep load change rate, the power grid requires the gas turbine to perform peak load regulation;

[0093] Start the combustion device according to the gas turbine peak load information;

[0094] After the combustion device passes the self-test, it enters the standby state;

[0095] According to the monitoring feedback signal of the combustion device, the supplementary combustion ratio of natural gas and hydrogen is determined, and the flow of the corresponding fuel regulating valve is automatically adjusted to control the steam pressure or flue gas temperature to be consistent with the target set value.

[0096] Optionally, Figure 4 FIG. 1 is a logical structure diagram of a gas turbine supplementary combustion coordination module according to an exemplary embodiment. Figure 4As shown in the figure, when the gas turbine load is reduced to the deep load or the gas turbine load change rate is greater than the deep load change rate, the power grid requires the gas turbine to further adjust the peak and the supplementary combustion device is put into operation. After receiving the power grid dispatching instruction, the DCS sends an instruction to the supplementary combustion system according to the dispatching instruction, and the supplementary combustion burner starts and enters the standby state after self-detection. At this time, the DCS sends a fuel valve opening instruction to the supplementary combustion system according to the monitoring feedback signal of the supplementary combustion device, and the fuel valve of the supplementary combustion device can be opened to the maximum within the minimum time. The supplementary combustion and the gas turbine peak regulation are coordinated and controlled by the DCS. The supplementary combustion control system automatically opens or closes the corresponding fuel regulating valve to adjust the combustion conditions so that the control point (steam pressure or flue gas temperature) is consistent with the set value. If there is a peak regulation plan, the supplementary combustion burner can be pre-invested to put the supplementary combustion burner in a hot standby state, accelerate the supplementary combustion process, further improve the supplementary combustion response speed, and meet the requirements of rapid response and deep peak regulation of the power grid. In addition, the start-up point of the supplementary combustion burner can be optimized based on the historical data of the power grid dispatching, through data mining technology, combined with the load characteristic curve of the unit and the characteristics of the supplementary combustion burner.

[0097] When the gas turbine load drops to less than or equal to the deep-adjustment load or the variable load rate is greater than or equal to the deep-adjustment variable load rate, the system can quickly obtain the grid peak-shaving information and immediately start the supplementary combustion device. The fuel valve of the supplementary combustion device can be opened to the maximum in the minimum time to ensure a rapid response to the grid dispatching instructions and meet the peak-shaving needs. Through the coordinated work of the DCS and the supplementary combustion control system, the flow of the fuel regulating valve is automatically adjusted to ensure that the steam pressure or flue gas temperature is consistent with the target set value, thereby improving the stability and reliability of the system. According to the monitoring feedback signal of the supplementary combustion device, the system adjusts the flow of the natural gas and hydrogen supplementary combustion valves in real time, determines the adjustment of the supplementary combustion ratio, ensures the optimal state of the combustion condition, improves energy utilization efficiency, and reduces operating costs.

[0098] In one embodiment, when calculating the operating parameters of the gas turbine after hydrogen replenishment, the calculation module is used to:

[0099] According to the exhaust gas flow and composition data of the gas turbine, the exhaust temperature and ambient temperature are used for correction, and the oxygen consumption, maximum supplementary combustion amount, minimum supplementary combustion amount, optimal node and approach point deviation under natural gas and hydrogen conditions are calculated respectively to obtain the operating parameters of the gas turbine after hydrogen supplementation; among them,

[0100] The maximum supplementary combustion amount includes the supplementary combustion amount limited by the maximum steam production, the supplementary combustion amount limited by the maximum exhaust temperature and the supplementary combustion amount limited by the oxygen content of the flue gas.

[0101] Optionally, by acquiring and processing the exhaust flow and composition data of the gas turbine, the accuracy and real-time performance of the calculation results are ensured. The exhaust temperature and ambient temperature are used for correction to improve the accuracy of the calculation and ensure that the system operates in the best state. The maximum steam production limit prevents the waste heat boiler from overloading and ensures the safety of the equipment. The maximum exhaust temperature limit prevents the exhaust temperature from being too high and protects the equipment from high temperature damage. The flue gas oxygen content limit ensures that there is sufficient oxygen supply during the combustion process to prevent incomplete combustion or excessive combustion. The minimum supplementary combustion amount ensures the stability and safety of the combustion process and prevents incomplete combustion or flameout due to too low supplementary combustion.

[0102] In one embodiment, the control device further includes a start module and a stop module; wherein,

[0103] Start-up module, used to safely start the combustion device through combustion mode selection, leak detection and ignition program control;

[0104] Optionally, the combustion mode selection includes natural gas and mixed hydrogen. Leak detection includes hydrogen valve leak detection and natural gas valve leak detection. Figure 5 FIG. 1 is a logical structure diagram of leakage detection according to an exemplary embodiment. Figure 5 As shown, the hydrogen valve leakage detection sequentially includes flame detection, gas detection, valve position detection, high pressure detection of gas supply pipeline, low pressure detection of gas supply pipeline, detection of the main circuit front supplementary combustion shut-off valve and detection of the main circuit rear supplementary combustion shut-off valve. After the hydrogen valve leakage, the natural gas valve leakage detection sequentially includes flame detection, gas detection, valve position detection, high pressure detection of gas supply pipeline, low pressure detection of gas supply pipeline, detection of the main circuit front supplementary combustion shut-off valve and detection of the main circuit rear supplementary combustion shut-off valve. Through multi-level and multi-link detection, the safe and stable operation of the hydrogen and natural gas supply systems is ensured, the overall performance of the system is improved, and the high requirements of the hydrogen combustion system in the gas turbine waste heat boiler are met. Once a leak or other abnormal situation is detected, the system can take immediate measures, such as triggering an alarm or shutting down, to prevent accidents.

[0105] Figure 6 FIG. 1 is a logical structure diagram of ignition program control according to an exemplary embodiment. Figure 6 As shown, the starter module is used for ignition programming:

[0106] Make ignition condition judgment, and if the ignition conditions are met, open the ignition circuit to connect the igniter;

[0107] Perform igniter flame detection and judgment. When the igniter flame meets the requirements, open the main circuit and connect the main burner.

[0108] Carry out the main burner flame detection and judgment. When the main burner flame meets the requirements, increase the load to stabilize the combustion, and put into flameout protection, and the ignition is completed.

[0109] Optionally, the ignition operation is started first to check whether the ignition conditions are met. If they are met, the next step is executed; otherwise, return to ignite again. Then, the ignition preparation is carried out, the ignition circuit is opened, the igniter is connected, the ignition circuit is opened and the igniter is connected. Next, the igniter is checked for flame. If there is flame, the next step is executed; if there is no flame, the igniter fault is handled, and then return to ignite again. Open the main circuit and connect the main burner: Open the main circuit and connect the main burner. Then, the main burner is checked for flame. If there is flame, the next step is executed; if there is no flame, three ignition failures are handled, and then return to ignite again. Next, the load is increased to maintain stable combustion. Then, the flameout protection device is installed to complete the ignition process. The ignition program control includes key steps such as ignition condition judgment, flame detection of the igniter and the main burner, and flameout protection. If a fault occurs in any step or the expected result is not achieved, it will return to the "re-ignition" step until the main burner is successfully ignited. The whole process is designed to ensure the success and safety of ignition.

[0110] It is worth noting that the supplementary combustion air comes from the exhaust gas of the gas turbine, which has a high flow rate and low oxygen content, and is therefore not easy to ignite; there is a maximum flue gas temperature limit. If the flue gas temperature is too high after supplementary combustion, it will directly affect the flue structure and its service life; the fuel supply pressure should remain stable. If the fuel supply pressure is too high, the flame will be too long and the superheater will be burned; if the fuel supply pressure is too low, the device will often be shut down.

[0111] Figure 7 FIG. 1 is a logical structure diagram of a stop module according to an exemplary embodiment. Figure 7 As shown, the stop module is used to control the burner through the sectional valve and safely shut down the combustion device.

[0112] Optionally, first, release the interlocking relationship between natural gas and ammonia. Next, release the flameout protection mechanism. Then, reduce the load to the position set by the main burner protection valve. Then, close the supplementary combustion segmentation valve. Reduce the load to the minimum flow protection valve position, reduce the load to the position set by the minimum flow protection valve. Next, close the shut-off valves before and after the main circuit: close the shut-off valves before and after the main circuit. Then, close the supplementary combustion shut-off valve. Next, open the air valve. Finally, prepare for ignition. The stop module contains key steps such as releasing the interlock, reducing the load, closing various valves, and preparing for ignition. The whole process is designed to ensure that combustion is stopped safely and ready for re-ignition.

[0113] In one embodiment, the safety device is used to monitor the state of the combustion device and shut down the combustion device when the combustion is abnormal; wherein,

[0114] The safety device includes an ignition flame detector, a natural gas main burner flame detector, a hydrogen flame detector, a protective cover, and a flame detection cooling unit; the ignition flame detector is used to detect the ignition flame, the natural gas main burner flame detector is used to detect the flame of the natural gas main burner, the hydrogen flame detector is used to detect the flame of the hydrogen main burner, the protective cover is used to protect the burner and related equipment, and the fire detection cooling device is used to cool the flame detector.

[0115] Optionally, the natural gas flame detector is an ionization flame detector and the hydrogen flame detector is a UV sensor. Through the ignition flame detector, the natural gas main burner flame detector and the hydrogen flame detector, reliable detection is ensured at every stage of the combustion process, and combustion abnormalities are discovered in time. Once a combustion abnormality is detected, the safety device will immediately shut down the combustion device to prevent accidents. The protective cover and the flame detection cooling device ensure the safety of the burner and related equipment, prevent external interference and physical damage, and extend the service life of the equipment.

[0116] Examples of practical applications:

[0117] First of all, for the units that have natural gas internal supplementary combustion system for waste heat boilers, it can be called the part of adding hydrogen supplementary combustion, including hydrogen supply device, hydrogen supplementary combustion installation device and combustion device. At the same time, in order to ensure the safety of the hydrogen combustion system, the air supply module in the hydrogen supply device can be selectively increased according to the requirements of the oxygen content, flow rate and velocity of the flue gas of the waste heat boiler for the safe combustion of hydrogen, and the air supply volume is calculated; the technical principle of the FGR system is to extract part of the low-temperature flue gas from the flue at the tail of the boiler, lead it to the air inlet of the burner fan, mix it with the combustion-supporting air and send it into the furnace together to participate in auxiliary combustion and thermodynamic flow field integration. Its core is to use the characteristics of low oxygen content and high inert gas content of flue gas to spray part of the flue gas into the furnace again, reduce the combustion rate of the gas, thereby reducing the peak temperature of the flame and reducing the generation of thermal NOx. For units of 9F and above with independent post-furnace denitrification system, it can be considered not to increase it.

[0118] Secondly, the upper-level monitoring system for the regulation of the flue re-combustion device is constructed with PLC and can also be connected to the control system of the entire combined cycle power generation device. Priority is given to centralized control based on the waste heat boiler DCS, but the control system parameter calculation part involves prediction and advanced computing functions. For DCS with weak support for advanced computing capabilities, it is possible to consider using an external advanced computing server to complete the computing service.

[0119] Finally, when the gas turbine is running above a high load rate, it can meet the heating demand without the need for supplementary combustion. When the power grid requires the gas turbine to further shave peak loads, the supplementary combustion device is put into operation. Taking the case where the gas turbine load rate is reduced to 50% load rate as an example, the system coordinated adjustment process is explained. After receiving the grid dispatching instruction, the DCS sends an instruction to the supplementary combustion system according to the dispatching instruction, and the supplementary combustion burner starts and enters the standby state after 30 seconds of self-detection. At this time, the DCS determines the supplementary combustion ratio of natural gas and hydrogen based on the detection feedback signal of the supplementary combustion device, and sends a fuel valve flow size instruction to the supplementary combustion system. The fuel valve of the supplementary combustion device can be opened to the maximum within 10 seconds. At this time, the gas turbine executes load reduction again, and the gas turbine load reduction process is completed in about 8 minutes. Supplementary combustion and gas turbine peak shaving are coordinated and controlled by DCS, and the whole process is completed in about 9 minutes.

[0120] In summary, the application embodiment provides a control system for hydrogen supplementation combustion in a gas turbine waste heat boiler, wherein the gas supply device includes a natural gas supply module and a hydrogen supply module, and the natural gas supply module and the hydrogen supply module transport natural gas and hydrogen to the combustion device. The combustion device includes a natural gas combustion module for burning natural gas and a hydrogen combustion module for burning hydrogen. The control device includes a calculation module, a natural gas and hydrogen coordination module, and a gas turbine supplementary combustion coordination module; the calculation module is used to calculate the gas turbine operating parameters after hydrogen supplementation, the natural gas and hydrogen coordination module is used to determine the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine operating parameters, and the gas turbine supplementary combustion coordination module is used to control the output of natural gas and hydrogen according to the gas turbine load changes and power grid dispatching instructions, and to peak the gas turbine preheating boiler. Hydrogen supplementation combustion control in the gas turbine waste heat boiler is realized to solve the problem of low energy utilization efficiency of hydrogen supplementation combustion control systems in related technologies. Safe and efficient hydrogen supplementation combustion is realized.

[0121] In a second aspect, an embodiment of the present application provides a system for controlling hydrogen replenishment combustion in a gas turbine waste heat boiler. Figure 8 The block diagram of a system for controlling hydrogen supplementation combustion in a gas turbine waste heat boiler according to an exemplary embodiment is shown. The method includes:

[0122] Step S801, transporting natural gas and hydrogen to a combustion device for combustion;

[0123] Step S802: acquiring the operating parameters of the gas turbine after hydrogen replenishment according to the exhaust flow and composition data of the gas turbine;

[0124] Step S803, determining the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine operating parameters;

[0125] Step S804: According to the change of gas turbine load and the dispatching instruction of the power grid, the gas turbine preheating boiler is peak-shifted by controlling the output of natural gas and hydrogen.

[0126] In summary, the embodiment of the present application provides a method for controlling hydrogen replenishment combustion in a gas turbine waste heat boiler, by conveying natural gas and hydrogen to a combustion device for combustion. According to the exhaust flow and composition data of the gas turbine, the operating parameters of the gas turbine after hydrogen replenishment are obtained. According to the operating parameters of the gas turbine, the ratio of natural gas and hydrogen replenishment is determined. According to the changes in the gas turbine load and the grid dispatching instructions, the gas turbine preheating boiler is peak-shaving by controlling the output of natural gas and hydrogen. Hydrogen replenishment combustion control in the gas turbine waste heat boiler is realized to solve the problem of low energy utilization efficiency of hydrogen replenishment combustion control systems in related technologies. Safe and efficient hydrogen replenishment combustion is realized.

[0127] It should be noted that the system for controlling hydrogen supplementation combustion in a gas turbine waste heat boiler provided in this embodiment is used to implement the above-mentioned implementation mode, and the descriptions that have been made will not be repeated. As used above, the terms "module", "unit", "subunit", etc. can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the above embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0128] In a third aspect, an embodiment of the present application provides an electronic device, Fig. 9 FIG. 1 is a block diagram of an electronic device according to an exemplary embodiment. Fig. 9 As shown, the electronic device may include a processor 91 and a memory 92 storing computer program instructions.

[0129] Specifically, the processor 91 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0130] Among them, the memory 92 may include a large-capacity memory for data or instructions. For example, but not limitation, the memory 92 may include a hard disk drive (HDD), a floppy disk drive, a solid-state drive (SSD), a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 92 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 92 may be inside or outside the data processing device. In a specific embodiment, the memory 92 is a non-volatile memory. In a specific embodiment, the memory 92 includes a read-only memory (ROM) and a random access memory (RAM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically alterable ROM (EAROM) or a flash memory (FLASH), or a combination of two or more of these. Under appropriate circumstances, the RAM can be a static random access memory (SRAM) or a dynamic random access memory (DRAM), wherein the DRAM can be a fast page mode dynamic random access memory (FPMDRAM), an extended data output dynamic random access memory (EDODRAM), a synchronous dynamic random access memory (SDRAM), etc.

[0131] The memory 92 may be used to store or cache various data files required for processing and / or communication, as well as possible computer program instructions executed by the processor 91 .

[0132] The processor 91 reads and executes the computer program instructions stored in the memory 92 to implement any one of the methods for controlling hydrogen supplementation combustion in a gas turbine waste heat boiler in the above-mentioned embodiments.

[0133] In one embodiment, a device for controlling hydrogen combustion in a gas turbine waste heat boiler may further include a communication interface 93 and a bus 90. Fig. 9 As shown, the processor 91, the memory 92, and the communication interface 93 are connected via a bus 90 and communicate with each other.

[0134] The communication interface 93 is used to implement communication between the modules, devices, units and / or equipment in the embodiment of the present application. The communication port 93 can also implement data communication with other components such as: external devices, image / data acquisition equipment, databases, external storage, and image / data processing workstations.

[0135] The bus 90 includes hardware, software or both, and couples the components of a device for controlling hydrogen combustion in a gas turbine waste heat boiler to each other. The bus 90 includes but is not limited to at least one of the following: a data bus, an address bus, a control bus, an expansion bus, and a local bus. By way of example and not limitation, bus 90 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses or a combination of two or more of the above. Where appropriate, bus 90 may include one or more buses. Although embodiments of the present application describe and illustrate a particular bus, the present application contemplates any suitable bus or interconnect.

[0136] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements a method for controlling hydrogen supplementation combustion in a gas turbine waste heat boiler provided in the first aspect.

[0137] The readable storage medium may include but is not limited to: a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device or any suitable combination of the above.

[0138] In a possible implementation, the present invention can also be implemented in the form of a program product, which includes a program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps of a method for controlling hydrogen replenishment combustion in a gas turbine waste heat boiler provided in the first aspect.

[0139] Among them, the program code for executing the present invention can be written in any combination of one or more programming languages, and the program code can be executed completely on the user device, partially on the user device, as an independent software package, partially on the user device and partially on a remote device, or completely on the remote device.

[0140] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0141] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A hydrogen supplement combustion control system in a gas turbine waste heat boiler, characterized in that: The system comprises a gas supply device, a combustion device and a control device; wherein, The gas supply device comprises a natural gas supply module and a hydrogen gas supply module, and the natural gas supply module and the hydrogen gas supply module transport natural gas and hydrogen to the combustion device; The combustion device comprises a natural gas combustion module for burning the natural gas and a hydrogen combustion module for burning the hydrogen; The control device includes a calculation module, a natural gas and hydrogen coordination module, and a gas turbine supplementary combustion coordination module; the calculation module is used to calculate the gas turbine operating parameters after hydrogen supplementation, the natural gas and hydrogen coordination module is used to determine the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine operating parameters, and the gas turbine supplementary combustion coordination module is used to peak the gas turbine waste heat boiler by controlling the output of the natural gas and hydrogen according to the gas turbine load change and the grid dispatching instruction; The natural gas and hydrogen coordination module includes a supplementary combustion ratio setting unit, which is set through a safety mode, an economic mode, an environmental protection mode and a manual mode; The safety mode is set according to the strength of the natural gas and hydrogen fire detection signals; The economic model is set according to the combustion costs of natural gas and hydrogen; The environmental protection mode is set according to the amount of nitrogen oxides generated when natural gas and hydrogen are burned; The manual mode is set according to the volume ratio and mass ratio of hydrogen usage.

2. The system according to claim 1, characterized in that The natural gas and hydrogen coordination module also includes a main loop control unit and a secondary loop control unit; wherein, The main loop control unit is based on the outlet steam pressure of the waste heat boiler, and uses a PID controller as the main regulator, and the controlled quantity is the outlet steam pressure of the waste heat boiler; the feedforward signal is the gas turbine power generation power corrected by the exhaust temperature of the waste heat boiler; The secondary loop control unit includes a hydrogen afterburning valve opening subunit and a natural gas afterburning valve opening subunit; the output of the main regulator is used as a given value of the secondary regulator, and fed back as hydrogen and natural gas afterburning valve opening measurement values, and the hydrogen and natural gas afterburning valve opening measurement values ​​meet the maximum and minimum flow restrictions; the position signals of the hydrogen and natural gas afterburning valve actuators and the position signal of the hydrogen afterburning valve actuator are output to control the opening of the afterburning valve.

3. The system according to claim 1, characterized in that The gas turbine supplementary combustion coordination module is used to adjust the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine load change and the grid dispatch instruction: When the gas turbine load is reduced to a deep load or the gas turbine load change rate is greater than the deep load change rate, the power grid requires the gas turbine to perform peak load regulation; Starting the combustion device according to the gas turbine peak-shaving information; After the combustion device passes the self-check, it enters the standby state; According to the monitoring feedback signal of the combustion device, the supplementary combustion ratio of the natural gas and hydrogen is determined, and the flow rate of the corresponding fuel regulating valve is automatically adjusted to control the steam pressure or the flue gas temperature to be consistent with the target set value.

4. The system according to claim 1, characterized in that The air supply device also includes: Cooling air supply module, used for natural gas ignition and combustion support, natural gas ignition and main burner fire detection cooling, hydrogen main burner fire detection cooling; Flue gas recirculation module, used for combustion support of natural gas large flare main burner and hydrogen main burner; Air supply module, used for combustion support of hydrogen main burner; The nitrogen supply module is used to purge the entire pipeline network with nitrogen before starting and after shutting down the hydrogen burner.

5. The system according to claim 1, characterized in that The natural gas combustion module comprises an ignition burner, a large flare main burner and a small flare main burner, wherein the large flare main burner and the small flare main burner are burned by the ignition burner, and the large flare main burner and the small flare main burner are set to be always on; The hydrogen combustion module includes a hydrogen burner, a blower, an air pressure switch and an air flow regulator, wherein the blower sucks in combustion-supporting air and delivers it to the hydrogen burner through a pipeline, the air pressure switch is used to monitor the pressure of the combustion-supporting air, and in the case of abnormal pressure, an alarm or shutdown signal will be triggered, and the air flow regulator is used to control the flow of the combustion-supporting air; The hydrogen burner comprises a pressure interlock for hydrogen high pressure protection, hydrogen low pressure protection and combustion air low pressure protection.

6. The system according to claim 1, characterized in that When calculating the operating parameters of the gas turbine after hydrogen replenishment, the calculation module is used to: According to the exhaust gas flow and composition data of the gas turbine, the exhaust temperature and ambient temperature are used for correction, and the oxygen consumption, maximum supplementary combustion amount, minimum supplementary combustion amount, optimal node and approach point deviation under natural gas and hydrogen conditions are calculated respectively to obtain the operating parameters of the gas turbine after hydrogen supplementation; among them, The maximum supplementary combustion amount includes the supplementary combustion amount limited by the maximum steam production amount, the supplementary combustion amount limited by the maximum exhaust temperature and the supplementary combustion amount limited by the oxygen content of the flue gas.

7. The system according to claim 1, characterized in that The control device also includes a start module and a stop module; wherein, The starting module is used to safely start the combustion device through combustion mode selection, leakage detection and ignition program control; The stop module is used to control the burner through the sectional valve to safely shut down the combustion device.

8. The system according to claim 7, characterized in that The starting module is used to safely start the combustion device through ignition program control: Make an ignition condition judgment, and if the ignition condition is met, open the ignition circuit and connect the igniter; Perform igniter flame detection and judgment. When the igniter flame meets the requirements, open the main circuit and connect the main burner. The flame of the main burner is detected and judged. When the flame of the main burner meets the requirements, the load is increased to stabilize the combustion, and the flameout protection is put into use, and the ignition is completed.

9. The system according to claim 1, characterized in that The system also includes a safety device, The safety device is used to monitor the state of the combustion device and shut down the combustion device when the combustion is abnormal; wherein, The safety device includes an ignition flame detector, a natural gas main burner flame detector, a hydrogen flame detector, a protective cover, and a flame detection cooling unit; the ignition flame detector is used to detect the ignition flame, the natural gas main burner flame detector is used to detect the flame of the natural gas main burner, the hydrogen flame detector is used to detect the flame of the hydrogen main burner, the protective cover is used to protect the burner and related equipment, and the fire detection cooling unit is used to cool the flame detector.

10. A method for controlling hydrogen combustion in a gas turbine waste heat boiler, characterized in that: The method is applied to the system as claimed in any one of claims 1 to 8, and the method comprises: transporting natural gas and hydrogen to a combustion device for combustion; According to the exhaust flow and composition data of the gas turbine, the operating parameters of the gas turbine after hydrogen supplementation are obtained; Determining the supplementary combustion ratio of natural gas and hydrogen according to the gas turbine operating parameters; According to the change of gas turbine load and the dispatching instruction of the power grid, the gas turbine waste heat boiler is peak-shifted by controlling the output of the natural gas and hydrogen.

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