Combustion state control method and system for gas turbine

Abstract

The invention discloses a gas turbine combustion state control method and system, and belongs to the technical field of gas turbines. The method comprises the following steps: acquiring a flame image and a pressure pulsation signal of a combustion chamber; main frequency signals are extracted through spectral analysis, and the abnormal state of the combustion chamber is judged by combining flame forms; further diagnosing an abnormal type according to the flame color and the jitter feature, and outputting a regulation strategy; and an oxidizing agent or fuel is dynamically injected through a high-precision flow meter, so that the combustion state returns to normal. The system comprises a combustion assembly, a measurement analysis assembly and a control feedback assembly, and multi-modal data fusion and closed-loop control are achieved. Non-contact optical measurement and high-frequency signal analysis are combined, the problems of measurement lag and interference of a traditional sensor are solved, the device has the advantages of being fast in response, high in precision, high in adaptability and the like, and the combustion efficiency and the equipment safety are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and in particular to a method and system for controlling the combustion state of a gas turbine. Background Art

[0002] The purpose of a combustion state control system is to ensure optimal combustion by monitoring and controlling pressure, temperature, and other parameters. This is crucial for improving energy efficiency, reducing emissions, and ensuring safe equipment operation. Existing combustion state control systems generally use various types of sensors for contact measurement of parameters such as pressure and temperature. However, in practice, due to the high temperature and high pressure conditions of gas turbine combustion chambers, sensors are installed remotely, inevitably resulting in lag in parameter measurement. Furthermore, contact measurement using sensors can interfere with the flow field being measured, causing errors in the measurement results and impacting the control system's ability to respond. Summary of the Invention

[0003] In response to the problems existing in the prior art, the present invention provides a gas turbine combustion state control system, which can solve the problems of the existing combustion state control system caused by parameter monitoring lag, resulting in untimely control system processing, ablation damage to combustion chamber components, and reduced combustion efficiency.

[0004] The present invention is achieved through the following technical solutions: A method for controlling combustion state of a gas turbine comprises the following steps: Step 1: Acquire a flame image of the mixed fuel in the combustion chamber and a pressure pulsation signal of the combustion chamber; Step 2: Obtain a main frequency signal based on the pressure pulsation signal, and determine the abnormal state of the combustion chamber based on the frequency range and flame shape of the main frequency signal; Step 3: diagnose the abnormal state of the combustion chamber according to the flame image, and output a control strategy based on the diagnosis result; Step 4: Inject oxidant or fuel into the combustion chamber according to the control strategy to make the combustion state normal.

[0005] Preferably, obtaining the main frequency signal according to the pressure pulsation signal includes: The pressure pulsation signal is preprocessed, and then the spectrum of the preprocessed pressure pulsation signal is changed to obtain a frequency signal, and the main frequency signal is extracted according to the frequency signal.

[0006] Preferably, the determining of the abnormal state of the combustion chamber according to the frequency range of the main frequency signal and the flame shape includes: When the main frequency signal is less than the first threshold and the flame response rate decreases, it is a first abnormal state; When the main frequency signal is between the first threshold and the second threshold, and the flame front decreases, it is a second abnormal state.

[0007] Preferably, diagnosing the abnormal state of the combustion chamber according to the flame image includes: According to the color and jitter shape of the flame in the combustion chamber, the first abnormal state and the second abnormal state are diagnosed, and the control strategy is output according to the diagnosis result.

[0008] Preferably, the method for diagnosing the first abnormal state is as follows: When the flame color of the combustion chamber is yellow or orange-red within the set time period, and the flame shakes violently and is accompanied by black smoke, the first abnormal state is the rich flameout state; When the flame color of the combustion chamber is blue at the set time, and the flame root is unstable, jumps, or the flame is elongated as a whole, the second abnormal state is a lean burnout state.

[0009] Preferably, the injecting of oxidant or fuel into the combustion chamber according to the control strategy comprises: When the abnormal state of the combustion chamber is a rich flameout state, a certain amount of oxidant is injected into the combustion chamber; When the abnormal state of the combustion chamber is a lean flameout state, a certain amount of fuel is injected into the combustion chamber.

[0010] A gas turbine combustion state control system includes a combustion component, a measurement and analysis component, and a control feedback component; The combustion component is used to fully burn the mixed fuel; The measurement and analysis component is connected to the combustion component, and is used to obtain a flame image of the mixed fuel in the combustion chamber and a pressure pulsation signal of the combustion chamber, and output an abnormality signal according to the flame image and the pressure pulsation signal; The control feedback component is used to regulate the combustion state of the mixed fuel according to the abnormal signal.

[0011] Preferably, the combustion assembly includes a burner, a combustion chamber and an air outlet channel, the inlet of the burner is connected to the air inlet cavity, the outlet of the burner is connected to the inlet of the combustion chamber, and the outlet of the combustion chamber is connected to the air outlet channel.

[0012] Preferably, the measurement and analysis component includes a sensor, a high-speed camera and a signal analysis system, and the sensor and the high-speed camera are respectively connected to the signal analysis system; The sensor is arranged on the gas outlet channel, and the high-speed camera collects the flame image inside the combustion chamber through the optical window.

[0013] Preferably, the control feedback assembly includes a control system, a multi-gas flow meter and an air intake channel; The multi-gas flow meter is connected to the air inlet cavity through the air inlet channel, and the multi-gas flow meter and the signal analysis system are connected to the control system.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The gas turbine combustion state control method provided in this application has significant technical advantages and practical value. Its core innovation lies in the combination of multimodal data fusion and intelligent control strategy to achieve real-time, accurate monitoring and rapid response to the combustion chamber state, effectively solving the problem of inaccurate control caused by sensor measurement lag, contact interference and single signal analysis in traditional combustion control systems. This method combines optical non-contact measurement with high-frequency pressure sensing technology by synchronously acquiring the flame image and pressure pulsation signal of the combustion chamber. It not only avoids the data lag caused by the limited installation of sensors in high-temperature and high-pressure environments, but also compensates for the shortcomings of pressure signals in transient anomaly diagnosis through the intuitive characteristics of flame images, significantly improving the comprehensiveness and reliability of data acquisition.

[0015] Furthermore, this method uses fast Fourier transform (FFT) to perform spectral analysis on the pressure pulsation signal, extracting the dominant frequency signal and combining it with dynamic characteristics of flame morphology (such as color change and jitter frequency) to construct a two-dimensional diagnostic model. When the dominant frequency is below 100Hz, the flame appears yellow / orange-red, and jitters violently, it can be accurately identified as a precursor to rich-burn flameout. When the dominant frequency is between 100-500Hz, the flame turns blue, and the root is unstable, it is identified as a lean-burn flameout risk. This cross-validation mechanism based on frequency domain and image features significantly reduces the false positive rate and provides a high-confidence decision basis for subsequent control.

[0016] Furthermore, during the control execution phase, this method dynamically adjusts the injection rate of oxidizer or fuel based on diagnostic results. For example, a high-precision multi-gas flowmeter (±0.2% accuracy) adjusts flow in real time, creating a closed-loop control system that quickly stabilizes combustion. Compared to traditional single-PID control or threshold alarm systems, this method, through automated processing of the entire "signal-image-action" chain, not only shortens response time to milliseconds but also significantly improves combustion efficiency (such as reducing unburned carbon particulate emissions) and equipment safety (such as preventing combustion chamber ablation).

[0017] This application also proposes a combustion state control system, an electronic device and a computer storage medium, which have all the advantages of the above-mentioned combustion state control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a structural block diagram of a gas turbine combustion state control system of the present invention.

[0020] In the figure: burner 11, combustion chamber 12, air outlet channel 13, air inlet channel 14, sensor 21, high-speed camera 22, signal analysis system 23, control system 31, multi-gas flow meter 32, air inlet channel 33. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0024] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use. This is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0025] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of this application, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in this application based on specific circumstances.

[0027] A gas turbine combustion state control method includes the following steps: Step 1: Acquire a flame image of the mixed fuel in the combustion chamber and a pressure pulsation signal of the combustion chamber; Step 2: Obtain a main frequency signal according to the pressure pulsation signal, and determine the combustion chamber state according to the frequency range of the main frequency signal; Specifically, the collected pressure pulsation signal is preprocessed, including removing bad values ​​or data cleaning. The preprocessed pressure pulsation data is subjected to spectral analysis using fast Fourier transform. By decomposing the frequency components in the signal, the oscillation main frequency (main frequency signal) of combustion instability (such as the precursor to rich / lean burn flameout) is extracted.

[0028] When the flame oscillation frequency is lower than 100 Hz, be alert to the possibility of flame rich flameout. This is because the reaction rate under rich flame conditions is limited by chemical kinetics (lack of oxygen leads to free radical quenching), the flame response becomes slow, and low-frequency oscillations are easily excited when coupled with the combustion chamber acoustic modes. When the flame oscillation frequency is between 100Hz and 500Hz, be wary of the possibility of lean flame extinction. This is because lean flames are dominated by flow field strain rate and turbulent disturbances. The flame front becomes thinner and is easily blown out locally by high-speed airflow, which can trigger medium- and high-frequency fluctuations associated with vortex shedding frequency or shear layer instabilities.

[0029] (Main frequency <100Hz): Low-frequency oscillations reflect chemical kinetic limitations caused by insufficient oxygen, resulting in a slow flame response and easy coupling with the combustion chamber acoustic mode; (Main frequency 100-500Hz): Medium and high-frequency fluctuations originate from flow field strain rate or turbulent disturbances, causing the flame front to become thinner and easily blown out. The main frequency range can be used to quickly locate the type of combustion instability, providing early warning for regulation.

[0030] Step 3: further diagnose the abnormal state of the combustion chamber based on the flame image and output a control strategy; When the flame oscillation frequency is lower than 100Hz, and the flame color turns yellow, shiny, or orange-red for a long time, the flame shakes violently, and visible black smoke is emitted, it can be judged that the flame state in the combustion chamber is at the rich flame extinction limit. At this time, a certain amount of oxidant needs to be injected into the combustion chamber. When the flame oscillation frequency is between 100Hz and 500Hz, the flame color turns blue or lighter for a long time, and the flame root is unstable, jumps, or is elongated as a whole, it can be judged that the flame state in the combustion chamber is at the lean burn extinction limit. At this time, a certain amount of fuel needs to be added to the combustion chamber to maintain normal combustion.

[0031] Step 4: Inject oxidant or fuel into the combustion chamber according to the control strategy to make the combustion state normal.

[0032] According to the control strategy output in step 3, the combustion chamber is intervened through the control system.

[0033] For the rich flameout limit, the control system triggers the air flow meter in the multi-gas flow meter to inject a certain amount of air into the intake chamber as an oxidant. For the lean flameout limit, the control system triggers the fuel flow meter in the multi-gas flow meter to inject a certain amount of fuel into the intake chamber. By injecting an appropriate amount of oxidant or fuel, the combustion state in the combustion chamber is adjusted to restore it to normal, thereby improving combustion efficiency, reducing emissions, and ensuring safe operation of the equipment. This method accurately determines the combustion state and outputs a corresponding control strategy by real-time monitoring and analysis of flame images and pressure pulsation signals in the combustion chamber. By injecting an appropriate amount of oxidant or fuel, the combustion state in the combustion chamber is restored to normal.

[0034] This gas turbine combustion state control method firstly achieves precise monitoring of the combustion chamber state by acquiring flame images and pressure pulsation signals in real time. Compared to traditional contact-based sensor measurement methods, this method effectively avoids the problems of remote sensor installation, measurement lag, and flow field interference in high-temperature and high-pressure environments, thereby improving the accuracy and timeliness of measurement data. Secondly, the method combines spectrum analysis and image recognition technologies to accurately identify combustion instability and precursors to rich / lean burnout. It extracts the main oscillation frequency through fast Fourier transform and performs a comprehensive diagnosis based on dynamic changes in flame color and morphology, significantly improving the accuracy and reliability of combustion state judgment. Furthermore, the control strategy output by this method is targeted and effective. It can timely inject the appropriate amount of oxidant or fuel based on abnormal combustion chamber conditions to quickly restore the combustion chamber to normal combustion, thereby effectively improving combustion efficiency, reducing emissions, and ensuring safe operation of the equipment. Furthermore, the high-speed camera and sensor devices used in this method feature non-contact measurement, which reduces interference with the combustion chamber. This also enhances the automation and intelligence level of the system, reduces the need for manual intervention, and improves overall operational efficiency and stability. This gas turbine combustion state control method shows significant advantages in measurement accuracy, judgment accuracy, control strategy effectiveness and system automation level, providing a strong guarantee for the efficient and safe operation of the gas turbine.

[0035] See Figure 1 A gas turbine combustion state control system includes a combustion component, a measurement and analysis component, and a control feedback component.

[0036] The combustion component is used to fully burn the mixed fuel; The measurement and analysis component is used to obtain the flame image of the mixed fuel in the combustion chamber and the pressure pulsation signal of the combustion chamber, and output an abnormal signal based on the flame image and the pressure pulsation signal; The control feedback component is used to regulate the combustion state of the mixed fuel according to the abnormal signal.

[0037] In some embodiments, the combustion assembly includes a burner 11, a combustion chamber 12 and an air outlet channel 13, the inlet of the burner 11 is connected to the air inlet cavity 14, the outlet of the burner 11 is connected to the inlet of the combustion chamber 12, and the outlet of the combustion chamber 12 is connected to the air outlet channel 13.

[0038] The combustible mixture delivered from the intake chamber 14 passes through the burner 11 and is fully burned in the combustion chamber 12, forming a stable and continuous flame. The main function of the intake chamber 14 is to fully and evenly mix the air and fuel within a large space, forming a combustible mixture that then enters the burner for combustion. The outlet passage 13 is mainly used to discharge combustion products and unburned gases. One end of the outlet passage 13 is connected to the combustion chamber outlet.

[0039] Optionally, the combustion chamber 12 is a conical structure, including a combustion chamber and a pressure chamber. The combustion chamber is a cylindrical structure, and the pressure chamber is a conical structure. One end of the combustion chamber is connected to the burner 11, and the other end of the combustion chamber is connected to the pressure chamber. The other end of the pressure chamber is connected to the air outlet channel 13, and the pressure chamber gradually tapers from the combustion chamber to the air outlet channel 13 to form a trumpet-shaped structure. The overall shape of the combustion chamber is conical and tapered. The main purpose is to increase the back pressure at the combustion chamber outlet so that there is a pressure difference between it and the atmospheric pressure, which is convenient for sensor measurement.

[0040] An optical window 15 is provided on the side wall of the pressure chamber of the combustion chamber 12 to facilitate optical measurement by a high-speed camera.

[0041] In some embodiments, the measurement and analysis component includes a sensor 21 , a high-speed camera 22 and a signal analysis system 23 , and the sensor 21 and the high-speed camera 22 are connected to the signal analysis system 23 , respectively.

[0042] The sensor 21 is used to monitor the timing fluctuation signals generated in the combustion chamber. The timing fluctuation signals include pressure pulsation signals, temperature signals, speed signals and heat release rate signals.

[0043] Optionally, the sensor is provided on the air outlet channel 13, and the sensor is at least one of a high-frequency dynamic pressure sensor, a temperature sensor, a speed sensor, and a heat release rate detection sensor.

[0044] The high-frequency dynamic pressure sensor may be at least one of a piezoelectric pressure sensor, a piezoresistive pressure sensor, a capacitive pressure sensor, or a ceramic pressure sensor; The temperature sensor may be at least one of a thermistor sensor, a thermocouple sensor, and a platinum thermal resistance temperature sensor; The speed sensor may be at least one of an ultrasonic wind speed sensor, a photoelectric wind speed sensor, and a pulse output wind speed sensor.

[0045] The heat release rate sensor may be a photomultiplier tube or a heat flux sensor.

[0046] To address the data monitoring lag associated with sensor 21, a high-speed camera 22 captures the flame image inside combustion chamber 12 through optical window 15. With its image acquisition port facing directly toward optical window 15, high-speed camera 22 monitors the flame's combustion status in real time and captures flame images for analysis. If the flame on the acquisition interface of high-speed camera 22 exhibits an unstable combustion state, with up-and-down fluctuations, and an abnormal dominant frequency response is detected in signal analysis system 23, the flame is considered unstable.

[0047] In some embodiments, the high-speed camera 22 can be equipped with narrow-band filter lenses of different wavelength ranges according to actual needs, and the flame free radical signal to be analyzed can be selected for collection according to signal analysis needs. For example, a CH* filter can be installed to collect the CH* signal during the flame combustion process. The CH* signal can characterize the changing trend of the heat release rate during the flame combustion process, eliminating the cost of special heat release rate detection equipment.

[0048] Optionally, the front end of the high-speed camera 22 can be equipped with a lens cover. When the camera is not in use, the camera cover can be used to cover the lens to prevent waste from the combustion process from contaminating the lens.

[0049] In some embodiments, the control feedback assembly includes a control system 31 , a multi-gas flow meter 32 , and an intake passage 33 .

[0050] The multi-gas flow meter 32 is connected to the air inlet chamber 14 through the air inlet channel 33 , and the multi-gas flow meter 32 and the signal analysis system 23 are connected to the control system.

[0051] The control system 31 is connected to the signal analysis system 23 and converts the sensing signal transmitted by the signal analysis system 23 into an execution signal through various control methods.

[0052] The control mode may be one or more of proportional-integral-differential control (PID control), phase shift control, linear quadratic Gaussian control, sliding mode control, least mean square adaptive control, H infinite robust control, neural network control, and STR self-regulating control.

[0053] When control system 31 receives an abnormality signal from signal analysis system 23, it issues a feedback execution signal, instructing multi-gas flowmeter 32 to deliver a certain amount of air or fuel to intake passage 33. Intake passage 33 is connected to intake chamber 14 and intervenes or controls abnormal combustion conditions in combustion chamber 12 by varying the fuel or air flow rate.

[0054] The multi-gas flowmeter 32 includes an air flowmeter and a fuel flowmeter (depending on the fuel selected during the actual combustion process). When the flame state in the acquisition interface of the high-speed camera 22 is at the lean burnout limit state, the control system 31 triggers the fuel flowmeter in the multi-gas flowmeter to input a certain amount of fuel into the intake cavity 14 to adjust the combustion state in the combustion chamber 12; When the flame state in the acquisition interface of the high-speed camera 22 is in the rich-burn blowout state, the control system 31 triggers the air flow meter in the multi-gas flow meter to input a certain amount of air into the air intake cavity 14 to adjust the combustion state in the combustion chamber 12.

[0055] The multi-gas flow meter 32 has a measuring range of 0.1 to 1,000,000 kg / h, with an accuracy within ±0.2%, which can meet the needs of flow regulation in actual working processes.

[0056] The following is a detailed explanation of a control method for a combustion state control system of the present application, which includes the following steps: Step 1: Start the burner 11 according to the preset working conditions, so that the combustion chamber 12 is filled with flames; Step 2: Start the high-frequency dynamic piezoelectric pressure sensor and the high-speed camera to monitor the pressure pulsation signal and flame combustion status in the combustion chamber in real time; Step 3: Analyze and process the collected flame image signal and pressure signal, and input them into the control system 31. The control system 31 selects an appropriate control method based on the two signals to intervene in the abnormal combustion state; If the pressure pulsation signal continues to be abnormal and the flame state detected by the high-speed camera 22 is within the lean burnout limit, the control system 31 triggers the fuel flow meter in the multi-gas flow meter to input a certain amount of fuel into the intake chamber 14, thereby timely intervening in the combustion state within the lean burnout limit. If the pressure pulsation signal continues to be abnormal and the flame state captured by the high-speed camera 22 is in a rich-burn blowout state, the control system 31 triggers the air flow meter in the multi-gas flow meter to input a certain amount of air into the intake chamber 14 as an oxidant, and timely intervenes in the combustion state under the lean-burn blowout limit.

[0057] Correspondingly, the present application also provides a combustion state control device, comprising: An acquisition module is used to obtain the flame image of the mixed fuel in the combustion chamber and the pressure pulsation signal of the combustion chamber; An analysis module is used to obtain a main frequency signal based on the pressure pulsation signal and determine the abnormal state of the combustion chamber based on the frequency range and flame shape of the main frequency signal; The diagnostic module is used to diagnose abnormal conditions of the combustion chamber based on the flame image and output a control strategy based on the diagnosis results; The control module is used to inject oxidant or fuel into the combustion chamber according to the control strategy to make the combustion state normal.

[0058] In another embodiment, the present application also provides a gas turbine control system, including the above-mentioned combustion state control system.

[0059] It should be noted that in the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of each module is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules can be combined or integrated into another device, or some features can be ignored or not executed. The modules described as separate components may or may not be physically separated. The components displayed as modules may be one physical unit or multiple physical units, that is, they may be located in one place, or they may be distributed in multiple different places. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0060] In addition, the modules in the various embodiments of the present invention may be integrated into a single processing unit, each module may exist physically separately, or two or more modules may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0061] An electronic device provided in an embodiment of the present application includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of the combustion state control method described in any of the above embodiments are implemented.

[0062] Another electronic device provided in an embodiment of the present application may further include: an input port connected to the processor for transmitting multimodal data collected by an external acquisition device to the processor; a display unit connected to the processor for displaying the processing results of the processor to the outside world; and a communication module connected to the processor for enabling communication between the electronic device and the outside world. The display unit may be a display panel, a laser scanning display, etc.; the communication method adopted by the communication module includes but is not limited to mobile high-definition link technology (HML), universal serial bus (USB), high-definition multimedia interface (HDMI), wireless connection (including wireless fidelity technology (WiFi), Bluetooth communication technology, low-power Bluetooth communication technology, and communication technology based on IEEE802.11s).

[0063] An embodiment of the present application provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the steps of the combustion state control method described in any of the above embodiments are implemented.

[0064] For descriptions of the relevant portions of the combustion state control system, electronic device, and computer-readable storage medium provided in the embodiments of this application, please refer to the detailed description of the corresponding portions of the combustion state control method provided in the embodiments of this application, and will not be repeated here. In addition, portions of the above-mentioned technical solutions provided in the embodiments of this application that are consistent with the implementation principles of corresponding technical solutions in the prior art are not described in detail to avoid excessive elaboration.

[0065] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for controlling combustion state of a gas turbine, characterized in that: The following steps are involved: Step 1: Acquire a flame image of the mixed fuel in the combustion chamber and a pressure pulsation signal of the combustion chamber; Step 2: Obtain a main frequency signal based on the pressure pulsation signal, and determine the abnormal state of the combustion chamber based on the frequency range and flame shape of the main frequency signal; Step 3: diagnose the abnormal state of the combustion chamber according to the flame image, and output a control strategy based on the diagnosis result; Step 4: Inject oxidant or fuel into the combustion chamber according to the control strategy to make the combustion state normal.

2. A gas turbine combustion state control method according to claim 1, characterized in that: The obtaining of the main frequency signal according to the pressure pulsation signal comprises: The pressure pulsation signal is preprocessed, and then the spectrum of the preprocessed pressure pulsation signal is changed to obtain a frequency signal, and the main frequency signal is extracted according to the frequency signal.

3. The method for controlling combustion state of a gas turbine according to claim 1, wherein: Determining the abnormal state of the combustion chamber according to the frequency range of the main frequency signal and the flame shape includes: When the main frequency signal is less than the first threshold and the flame response rate decreases, it is a first abnormal state; When the main frequency signal is between the first threshold and the second threshold, and the flame front decreases, it is a second abnormal state.

4. A gas turbine combustion state control method according to claim 3, characterized in that: Diagnosis of abnormal combustion chamber conditions based on flame images includes: According to the color and jitter shape of the flame in the combustion chamber, the first abnormal state and the second abnormal state are diagnosed, and the control strategy is output according to the diagnosis result.

5. A gas turbine combustion state control method according to claim 4, characterized in that: The method for diagnosing the first abnormal state is as follows: When the flame color of the combustion chamber is yellow or orange-red within the set time period, and the flame shakes violently and is accompanied by black smoke, the first abnormal state is the rich flameout state; When the flame color of the combustion chamber is blue at the set time, and the flame root is unstable, jumps, or the flame is elongated as a whole, the second abnormal state is a lean burnout state.

6. A gas turbine combustion state control method according to claim 5, characterized in that: The injecting of oxidant or fuel into the combustion chamber according to the control strategy includes: When the abnormal state of the combustion chamber is a rich flameout state, a certain amount of oxidant is injected into the combustion chamber; When the abnormal state of the combustion chamber is a lean flameout state, a certain amount of fuel is injected into the combustion chamber.

7. A system for executing the gas turbine combustion state control method according to any one of claims 1 to 6, characterized in that: Includes combustion components, measurement and analysis components, and control feedback components; The combustion component is used to fully burn the mixed fuel; The measurement and analysis component is connected to the combustion component, and is used to obtain a flame image of the mixed fuel in the combustion chamber and a pressure pulsation signal of the combustion chamber, and output an abnormality signal according to the flame image and the pressure pulsation signal; The control feedback component is used to regulate the combustion state of the mixed fuel according to the abnormal signal.

8. The system of the gas turbine combustion state control method according to claim 7, characterized in that: The combustion assembly includes a burner, a combustion chamber and an air outlet channel. The inlet of the burner is connected to the air inlet cavity, the outlet of the burner is connected to the inlet of the combustion chamber, and the outlet of the combustion chamber is connected to the air outlet channel.

9. The system of the gas turbine combustion state control method according to claim 7, characterized in that: The measurement and analysis component includes a sensor, a high-speed camera and a signal analysis system, and the sensor and the high-speed camera are respectively connected to the signal analysis system; The sensor is arranged on the gas outlet channel, and the high-speed camera collects the flame image inside the combustion chamber through the optical window.

10. The system of the gas turbine combustion state control method according to claim 9, characterized in that: The control feedback assembly includes a control system, a multi-gas flow meter and an air intake channel; The multi-gas flow meter is connected to the air inlet cavity through the air inlet channel, and the multi-gas flow meter and the signal analysis system are connected to the control system.

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