Gas turbine flameout monitoring and protecting method and device

Abstract

The invention discloses a gas turbine flameout monitoring protection method and device, and the method comprises the steps: monitoring the temperature of a combustion chamber through a preset sensor in the combustion chamber of a gas turbine, and the preset sensor comprises a flameout thermocouple and / or a light field multispectral thermodetector; acquiring a flameout thermocouple temperature corresponding to the flameout thermocouple and / or a light field multispectral thermodetector temperature corresponding to the light field multispectral thermodetector; and based on the temperature of the flameout thermocouple and / or the temperature of the light field multispectral thermometer, whether flameout of the gas turbine occurs or not is judged according to a preset gas turbine flameout criterion. The flameout thermocouple and the light field multispectral thermodetector are combined to monitor the state of the gas turbine, so that the problems of missing detection and false detection caused by low sensitivity of long-term operation and insufficient arrangement of an optical flame detector which is singly adopted can be solved, and the problem of low reliability caused by easy damage of the flameout thermocouple which is singly adopted can be weakened; therefore, occurrence of flameout faults can be judged more accurately, and flameout protection can be adopted timely and effectively.

Description

Technical Field

[0001] The invention relates to the technical field of gas turbines, and in particular to a method and a device for monitoring and protecting a flameout of a gas turbine. Background Art

[0002] With the rapid advancement of carbon emission reduction and carbon neutrality in major countries around the world, gas turbines are beginning to face carbon emission pressure due to the long-term use of natural gas. Frequent global extreme climate, energy security, low-carbon emission reduction and other issues have made it imperative to develop new low-carbon green energy equipment. Gas turbines are clean thermal power generation technologies that are safe, reliable, peak-scalable and sustainable and stable. The development of new gas turbines that can use hydrogen or other renewable gas fuels is of great significance to the realization of a sustainable green economy. On the one hand, it can alleviate energy security issues, and on the other hand, it can lead the application direction of zero-carbon clean energy, and will play a key supporting role in "building a new power system with new energy as the main body". Major international gas turbine manufacturers have regarded hydrogen engines as an important development direction. At present, hydrogen gas turbines are mainly in the demonstration stage. The hydrogen blending ratio of mainstream international heavy-duty gas turbines can reach 30%, and the hydrogen blending ratio of small and medium-sized gas turbines can reach a level higher than 50%. The demonstration power stations of various manufacturers are mostly under construction or about to be built, and they plan to gradually transition to pure hydrogen gas turbine power stations. For hydrogen-blended or pure hydrogen engines, compared with traditional natural gas fuel, the addition of hydrogen will cause significant changes in the physical and chemical properties of the fuel. Hydrogen will broaden the flammable range of traditional hydrocarbon fuels, accelerate the flame propagation speed of the fuel, and increase the combustion speed in turbulent combustion of the fuel. It also has a lower minimum ignition energy, a wider explosion limit, and is more prone to spontaneous combustion. Therefore, hydrogen has a high risk of spontaneous combustion and explosion. In addition, the diffusion rate of hydrogen is faster than that of natural gas. When the combustion chamber of the gas turbine fails to ignite or flames out, a large amount of hydrogen will be discharged into the downstream turbine cylinder, diffusion section, waste heat boiler and other chambers, which can easily cause serious safety accidents. The unit needs to be equipped with flameout protection to monitor the flameout of the combustion chamber and cut off the hydrogen supply in time to avoid accidents. Therefore, for the current mainstream dry low-emission premixed combustion organization mode of the gas turbine, in addition to using aerodynamic design in the nozzle design stage to prevent flameout to a certain extent and controlling the appropriate equivalence ratio in the operation stage to prevent flameout, flameout protection at the gas turbine operation control level is also a necessary measure when burning hydrogen-mixed / pure hydrogen fuel. The existing gas turbine flameout protection device mainly relies on optical flame detectors to determine whether the flame is established or extinguished by detecting the radiation intensity of specific infrared or ultraviolet frequency bands in the combustion flame. The problems existing in the existing technical solutions are as follows:

[0003] 1) Optical flame detectors may have reduced detection sensitivity due to oil, dust, etc. attached to the probe, resulting in the possibility of missed and false flame detections; and optical flame detectors are easily damaged in high temperature environments; 2) Optical flame detectors are relatively expensive, and for combustion chambers with a linked flame tube design, flame detectors are usually not installed in every combustion chamber, posing a risk of missed detections. 3) The method of using combustion chamber gas flow rate detection to determine whether the flame is established does not directly monitor the flame, and the flow rate fluctuation threshold is difficult to calculate accurately, posing a risk of missed and false detections. 4) The losses and consequences caused by the failure to ignite or flameout of a pure hydrogen gas turbine are serious, and a single optical flame detection and protection measure is difficult to guarantee sufficiently high reliability requirements.

[0004] The existing patent CN104676633A discloses a gas turbine flame detection method and system, which measures and calculates the gas flow rate of the combustion chamber of the gas turbine to be tested, monitors the fluctuation value of the gas flow rate of the combustion chamber in real time, and judges whether the flame is established according to the fluctuation value. If the fluctuation value of the combustion chamber flow rate decreases is less than the first preset threshold, the combustion chamber is in a flameout state, and if the fluctuation value of the combustion chamber flow rate increase is greater than the second preset threshold, the combustion chamber has established a flame. The flame detection method of this method is relatively simple, and does not solve the problem that the single optical flame detection and protection measures in the prior art are difficult to ensure sufficiently high reliability requirements.

[0005] The existing patent CN103195583A discloses a method for monitoring and protecting gas turbine combustion by exhaust temperature dispersion. The method is to install multiple temperature measuring thermocouples at the turbine exhaust end of the gas turbine, and use the multi-dimensional space cosine theorem to collect signals from the temperature measuring thermocouples to obtain the exhaust temperature dispersion, thereby indirectly predicting the stability of combustion in the combustion chamber; establish the alarm logic and alarm exit logic of gas turbine combustion monitoring and protection according to the exhaust temperature dispersion; and establish the dangerous tripping logic of gas turbine combustion monitoring and protection.

[0006] In summary, the above two existing patents do not solve the risks of missed detection and false detection in the prior art optical flame detection, and the problem that it is difficult to ensure high reliability requirements. Summary of the invention

[0007] Based on the above technical problems, the present invention proposes a method and device for monitoring and protecting a flameout of a combustion engine, which solves the risks of missed detection and false detection in the prior art using optical flame detection, and the problem that it is difficult to ensure high reliability requirements.

[0008] A combustion engine flameout monitoring and protection method, comprising:

[0009] The temperature of the combustion chamber is monitored by using a preset sensor in the combustion chamber of the gas turbine, wherein the preset sensor includes a flameout thermocouple and / or a light field multi-spectrum thermometer;

[0010] Obtaining a flameout thermocouple temperature corresponding to the flameout thermocouple and / or a light field multi-spectrum thermometer temperature corresponding to the light field multi-spectrum thermometer;

[0011] Based on the flameout thermocouple temperature and / or the light field multi-spectrum thermometer temperature, a preset flameout criterion of the fuel engine is used to determine whether the fuel engine has flameout.

[0012] Furthermore, the combustion chamber of the gas turbine includes a fuel nozzle, a combustion chamber, a transition section and an outlet, a flameout thermocouple is arranged at one end of the fuel nozzle, and a light field multi-spectral thermometer is arranged on the inner wall of the combustion chamber.

[0013] Furthermore, the light field multi-spectral thermometers are arranged at equal intervals in the circumferential direction on the inner wall of the combustion chamber.

[0014] Further, based on the flameout thermocouple temperature, a preset flameout criterion of the combustion engine is used to determine whether the combustion engine has flameout, including:

[0015] Based on the flameout thermocouple temperature or the flameout thermocouple temperature reduction rate, a preset engine flameout criterion is used to determine whether the engine flameout occurs.

[0016] Furthermore, the preset engine flameout criterion includes one or more of a first criterion, a second criterion and a third criterion.

[0017] The first criterion is that the difference between the flameout thermocouple temperatures of at least two flameout thermocouples in the same combustion chamber and the average flameout thermocouple temperatures of all flameout thermocouples in the combustion chamber of the combustion engine is less than a first threshold value, and the delay meets a first preset time length;

[0018] The second criterion is that there are at least two flameout thermocouples in the same combustion chamber whose flameout thermocouple temperature reduction rate is greater than a second threshold value, and the delay meets a second preset time length;

[0019] The third criterion is that the difference between the flameout thermocouple temperatures of at least two flameout thermocouples in the same combustion chamber and the flameout thermocouple temperature measurement theoretical value under the combustion chamber operating conditions is less than a third threshold, and the delay meets a third preset time length.

[0020] Further, based on the flameout thermocouple temperature, a preset flameout criterion of the combustion engine is used to determine whether the combustion engine has flameout, including:

[0021] Determine whether the flameout thermocouple temperature satisfies any one of the first criterion, the second criterion and the third criterion;

[0022] If any one of the first criterion, the second criterion and the third criterion is met, the combustion engine is turned off.

[0023] Furthermore, the determination of the average value of the flameout thermocouple temperature includes:

[0024] According to the number of flameout thermocouple monitoring signals, signal quality and the flameout thermocouple temperature of each signal, the average flameout thermocouple temperature is determined by a signal conditioning optimization algorithm.

[0025] Furthermore, according to the number of flameout thermocouple monitoring signals, signal quality and flameout thermocouple temperature of each signal, the flameout thermocouple temperature average value is determined by a signal conditioning optimization algorithm, including:

[0026] The signal quality includes normal and abnormal. When the number of signals with normal signal quality is greater than a fourth threshold, the flameout thermocouple temperature average is the average of the flameout thermocouple temperatures of the signals with normal signal quality.

[0027] When the number of signals with normal signal quality is less than or equal to the fourth threshold value and greater than the fifth threshold value, determining the flameout thermocouple temperature average value according to the flameout thermocouple temperature of the signals with normal signal quality and the confidence interval of the preset flameout thermocouple temperature theoretical value;

[0028] When the number of signals with normal signal quality is less than or equal to the fifth threshold, the flameout thermocouple temperature average value is the flameout thermocouple temperature theoretical value.

[0029] Furthermore, the fourth threshold is 2 / 3 of the total number of all flameout thermocouples in the combustion chamber of the gas engine; and the fifth threshold is 1 / 3 of the total number of all flameout thermocouples in the combustion chamber of the gas engine.

[0030] Further, the flameout thermocouple temperature average value is determined based on the flameout thermocouple temperature of the signal with normal signal quality and the confidence interval of the flameout thermocouple temperature theoretical value, including:

[0031] Determine the average value of the initial flameout thermocouple temperature according to the flameout thermocouple temperature of the signal with normal signal quality;

[0032] If the initial flameout thermocouple temperature average value is within the preset confidence interval of the flameout thermocouple temperature theoretical value, the initial flameout thermocouple temperature average value is used as the flameout thermocouple temperature average value;

[0033] If the initial flameout thermocouple temperature average value is greater than the upper limit value of the confidence interval of the preset flameout thermocouple temperature theoretical value, the upper limit value is used as the flameout thermocouple temperature average value;

[0034] If the initial flameout thermocouple temperature average value is less than the lower limit value of the confidence interval of the preset flameout thermocouple temperature theoretical value, the lower limit value is used as the flameout thermocouple temperature average value.

[0035] Furthermore, the theoretical value of the flameout thermocouple temperature is determined by formula 1:

[0036] T x =f1(T0,P0,RH,T2,CPR,SPD,IGV,T f ,FR,η F ,η T ,PWR), where T0 is

[0037] Ambient temperature, P0 is ambient atmospheric pressure, RH is ambient atmospheric humidity, T2 is gas turbine compressor outlet temperature, CPR is gas turbine compressor pressure ratio, SPD is gas turbine speed, IGV is gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, η F is the combustion efficiency of the gas turbine, η T is the turbine efficiency of the gas turbine, and PWR is the active power of the gas turbine generator.

[0038] Furthermore, based on the temperature of the light field multi-spectral thermometer, a preset engine flameout criterion is used to determine whether the engine flameout occurs, including:

[0039] Based on the temperature of the light field multi-spectral thermometer or the temperature reduction rate of the light field multi-spectral thermometer, a preset engine flameout criterion is used to determine whether the engine flameout occurs.

[0040] Furthermore, the preset engine flameout criterion also includes one or more of a fourth criterion, a fifth criterion and a sixth criterion.

[0041] The fourth criterion is that the difference between the light field multi-spectral thermometer temperature of at least two light field multi-spectral thermometers in the same combustion chamber and the light field multi-spectral thermometer temperature average of all light field multi-spectral thermometers in the combustion chamber of the gas turbine is less than the seventh threshold value, and the delay meets the fourth preset time length;

[0042] The fifth criterion is that there are at least two light field multi-spectral thermometers in the same combustion chamber whose light field multi-spectral thermometer temperature reduction rate is greater than the eighth threshold value, and the delay meets the fifth preset time length;

[0043] The sixth criterion is that the difference between the light field multi-spectral thermometer temperatures of at least two light field multi-spectral thermometers in the same combustion chamber and the theoretical values ​​of the light field multi-spectral thermometers under the working conditions of the combustion chamber is less than the ninth threshold, and the delay meets the sixth preset time length.

[0044] Furthermore, based on the temperature of the light field multi-spectral thermometer, a preset engine flameout criterion is used to determine whether the engine flameout occurs, including:

[0045] Determine whether the temperature of the light field multi-spectral thermometer satisfies any one of the fourth criterion, the fifth criterion and the sixth criterion;

[0046] If any one of the fourth criterion, the fifth criterion and the sixth criterion is met, the engine is turned off.

[0047] Furthermore, the determination of the average temperature of the light field multi-spectral thermometer includes:

[0048] According to the number of monitoring signals of the light field multi-spectral thermometer, the signal quality and the light field multi-spectral thermometer temperature of each signal, the average temperature of the light field multi-spectral thermometer is determined by a signal conditioning optimization algorithm.

[0049] Furthermore, according to the number of light field multi-spectral thermometer monitoring signals, signal quality and the light field multi-spectral thermometer temperature of each signal, the light field multi-spectral thermometer temperature average value is determined by a signal conditioning optimization algorithm, including:

[0050] The signal quality includes normal and abnormal. When the number of signals with normal signal quality is greater than the tenth threshold, the light field multi-spectral thermometer temperature average value is the light field multi-spectral thermometer temperature average value of the signals with normal signal quality;

[0051] When the number of signals with normal signal quality is less than or equal to the tenth threshold value and greater than the eleventh threshold value, the light field multi-spectral thermometer temperature average value is determined according to the light field multi-spectral thermometer temperature of the signals with normal signal quality and the confidence interval of the preset light field multi-spectral thermometer temperature theoretical value;

[0052] When the number of signals with normal signal quality is less than or equal to the eleventh threshold, the average temperature value of the light field multi-spectral thermometer is the theoretical temperature value of the light field multi-spectral thermometer.

[0053] Furthermore, the theoretical temperature value of the light field multi-spectral thermometer is determined by formula 2:

[0054] T comb =f2(T0,P0,RH,T2,CPR,SPD,IGV,T f ,FR,η F ,η T , PWR), where T0 is the ambient temperature, P0 is the ambient atmospheric pressure, RH is the ambient atmospheric humidity, T2 is the gas turbine compressor outlet temperature, CPR is the gas turbine compressor pressure ratio, SPD is the gas turbine speed, IGV is the gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, η F is the combustion efficiency of the gas turbine, η T is the turbine efficiency of the gas turbine, and PWR is the active power of the gas turbine generator.

[0055] Furthermore, based on the flameout thermocouple temperature and the light field multi-spectral thermometer temperature, a preset flameout criterion of the combustion engine is used to determine whether the combustion engine has flameout, including:

[0056] Based on any two parameters of the flameout thermocouple temperature, the light field multi-spectral thermometer temperature, the flameout thermocouple temperature reduction rate and the light field multi-spectral thermometer temperature reduction rate, the preset engine flameout criterion is used to determine whether the engine has flameout.

[0057] Furthermore, the preset engine flameout criterion also includes: one or more of the seventh criterion, the eighth criterion, the ninth criterion and the tenth criterion,

[0058] The seventh criterion is that at least m of all flameout thermocouple temperatures are lower than the twelfth threshold, and at least n of all light field multi-spectrum thermometer temperatures are lower than the thirteenth threshold, and the delay meets the seventh preset time length;

[0059] The eighth criterion is that among all the flameout thermocouple temperatures, at least p flameout thermocouple temperatures are lower than the fourteenth threshold, and among all the light field multi-spectral thermometer temperatures, at least q light field multi-spectral thermometer temperatures have a temperature decrease rate greater than the fifteenth threshold, and the delay meets the eighth preset time length;

[0060] The ninth criterion is that among all the flameout thermocouple temperatures, at least r flameout thermocouple temperatures have a temperature decrease rate greater than the sixteenth threshold, and among all the light field multi-spectrum thermometer temperatures, at least s light field multi-spectrum thermometer temperatures have a temperature less than the seventeenth threshold, and the delay meets the ninth preset time length;

[0061] The tenth criterion is that among all the flameout thermocouple temperatures, there are at least t flameout thermocouple temperatures whose temperature reduction rate is greater than the eighteenth threshold, and among all the light field multi-spectral thermometer temperatures, there are at least u light field multi-spectral thermometer temperatures whose temperature reduction rate is greater than the nineteenth threshold, and the delay meets the tenth preset time length.

[0062] Furthermore, the parameters m, p, r, and t are determined by formula 3. Formula 3:

[0063] X=f3(T0,P0,RH,T2,CPR,SPD,IGV,T f ,FR,PWR), where T0 is the ambient temperature, P0 is the ambient atmospheric pressure, RH is the ambient atmospheric humidity, T2 is the gas turbine compressor outlet temperature, CPR is the gas turbine compressor pressure ratio, SPD is the gas turbine speed, IGV is the gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, and PWR is the active power of the gas turbine generator;

[0064] The parameters n, q, s, and u are determined by formula 4. Formula 4:

[0065] Y=f4(T0,P0,RH,T2,CPR,SPD,IGV,Tf ,FR,PWR), where T0 is the ambient temperature, P0 is the ambient atmospheric pressure, RH is the ambient atmospheric humidity, T2 is the gas turbine compressor outlet temperature, CPR is the gas turbine compressor pressure ratio, SPD is the gas turbine speed, IGV is the gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, and PWR is the active power of the gas turbine generator.

[0066] Furthermore, it also includes:

[0067] When the eleventh criterion is met, the engine flames out. The eleventh criterion is that the flameout thermocouples in the same combustion chamber or the light field multi-spectral thermometers in the same combustion chamber are both faulty.

[0068] Furthermore, it also includes:

[0069] When the judgment result obtained by judging whether the engine has flamed out based on the flameout thermocouple temperature using the preset engine flameout criterion is inconsistent with the judgment result obtained by judging whether the engine has flamed out based on the light field multi-spectral thermometer temperature using the preset engine flameout criterion, the judgment result obtained based on the light field multi-spectral thermometer temperature is selected.

[0070] A flameout monitoring and protection device for a combustion engine, the device is used to perform flameout monitoring and protection according to the above method, and the device comprises:

[0071] A monitoring module, used to monitor the temperature of the combustion chamber using a preset sensor in the combustion chamber of the gas turbine, wherein the preset sensor includes a flameout thermocouple and / or a light field multi-spectrum thermometer;

[0072] An acquisition module, used to acquire a flameout thermocouple temperature corresponding to the flameout thermocouple, and / or a light field multi-spectrum thermometer temperature corresponding to the light field multi-spectrum thermometer;

[0073] The judgment module is used to judge whether the engine has flameout based on the flameout thermocouple temperature and / or the light field multi-spectrum thermometer temperature using a preset engine flameout criterion.

[0074] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0075] 1. The present invention proposes to combine a flameout thermocouple with a light field multi-spectral thermometer to monitor the state of the gas engine, so as to make up for the problem of missed detection and false detection caused by the reduced sensitivity of the optical flame detector due to long-term operation and insufficient arrangement, and can also weaken the problem of reduced reliability caused by the easy damage of the flameout thermocouple alone. In combination with the application of a light field multi-spectral thermometer that characterizes the combustion stability of the combustion chamber, the light field multi-spectral thermometer has the advantages of high precision and high response speed. The combination of the monitoring methods can more effectively and reliably monitor the operating conditions of the combustion chamber of the gas engine, more accurately judge the occurrence of flameout failure, and then take flameout protection more promptly and effectively, reducing the risk and loss of serious safety accidents that may be caused by ignition failure or flameout of the combustion chamber.

[0076] 2. The present invention provides corresponding preset engine flameout criteria to determine whether the engine has flamed out, namely, setting a flameout thermocouple alone, setting a light field multi-spectral thermometer temperature alone, or combining a flameout thermocouple with a light field multi-spectral thermometer. When one of the criteria is met, it is considered that the engine has flamed out. The method and device detect the engine status from multiple angles, which can reduce the problem of missed detection and improve the reliability of the detection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0078] Figure 1 A flow chart of a method for monitoring and protecting a combustion engine flameout according to an embodiment of the present invention;

[0079] Figure 2 This is a schematic diagram of the arrangement of multiple types of sensors in the combustion chamber of this embodiment;

[0080] Figure 3 This is a schematic diagram of the principle of the light field multi-spectral thermometer;

[0081] Figure 4 The present invention is a schematic diagram of a combustion engine flameout monitoring and protection device according to an embodiment of the present invention.

[0082] The above drawings include the following reference numerals:

[0083] 100, fuel nozzle; 200, combustion chamber; 300, transition section; 400, outlet; 500, flameout thermocouple; 600, light field multi-spectral thermometer. DETAILED DESCRIPTION

[0084] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0085] The present invention is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention.

[0086] Example

[0087] In order to solve the risks of missed detection and false detection in the prior art optical flame detection and the difficulty in ensuring high reliability requirements, the present invention proposes a method and device for monitoring and protecting a combustion engine flameout.

[0088] like Figure 1 A flow chart of a method for monitoring and protecting a combustion engine flameout according to an embodiment of the present invention is shown in FIG. 1 , which comprises the following steps:

[0089] S1, using a preset sensor in the combustion chamber of the gas turbine to monitor the temperature of the combustion chamber, the preset sensor includes a flameout thermocouple and / or a light field multi-spectrum thermometer.

[0090] The gas engine comprises a plurality of combustion chambers, and the combustion chamber of the gas engine comprises a fuel nozzle, a combustion chamber, a transition section and an outlet. When setting the sensor, a flameout thermocouple or a light field multi-spectral thermometer, or a combination of the two sensors can be selected according to actual needs to monitor the temperature of the combustion chamber. The flameout thermocouple is arranged at one end of the fuel nozzle, and the light field multi-spectral thermometer is arranged on the inner wall of the combustion chamber.

[0091] In this embodiment, the sensors preset in each combustion chamber include flameout thermocouples and light field multi-spectral thermometers, such as Figure 2 The schematic diagram of the arrangement of multiple types of sensors in the combustion chamber of this embodiment is shown in FIG. The combustion chamber includes a fuel nozzle 100, a combustion chamber 200, a transition section 300, and an outlet 400. Among them, the flameout thermocouple 500 is arranged at one end of the fuel nozzle 100, and the light field multi-spectral thermometer 600 is arranged at equal intervals on the inner wall of the combustion chamber 200 in the circumferential direction. Figure 3 A schematic diagram of the principle of a light field multi-spectral thermometer is shown in FIG.

[0092] Specifically, in each combustion chamber of the present embodiment, a plurality of flameout thermocouples and a plurality of light field multi-spectral thermometers are arranged. It should be understood that the number of flameout thermocouples and light field multi-spectral thermometers can be set according to actual needs, and the arrangement positions of the flameout thermocouples and light field multi-spectral thermometers can be adjusted according to the actual monitoring effect.

[0093] S2, obtaining a flameout thermocouple temperature corresponding to the flameout thermocouple and / or a light field multi-spectrum thermometer temperature corresponding to the light field multi-spectrum thermometer.

[0094] In this embodiment, what is obtained is the flameout thermocouple temperature corresponding to the flameout thermocouple and the light field multi-spectrum thermometer temperature corresponding to the light field multi-spectrum thermometer.

[0095] S3, based on the flameout thermocouple temperature and / or the light field multi-spectrum thermometer temperature, using a preset flameout criterion of the combustion engine to determine whether the combustion engine has flameout.

[0096] The present invention sets corresponding preset engine flameout criteria to judge whether the engine has flameout according to three types: based on flameout thermocouple temperature alone, based on light field multi-spectrum thermometer temperature alone, or based on a combination of flameout thermocouple temperature and light field multi-spectrum thermometer temperature.

[0097] Further, based on the flameout thermocouple temperature, using a preset engine flameout criterion to determine whether the engine has flamed out includes: based on the flameout thermocouple temperature or the flameout thermocouple temperature reduction rate, using a preset engine flameout criterion to determine whether the engine has flamed out.

[0098] The preset engine flameout criterion includes one or more of the first criterion, the second criterion and the third criterion. Among them, the first criterion is that the difference between the flameout thermocouple temperature of at least two flameout thermocouples in the same combustion chamber and the average value of the flameout thermocouple temperature of all flameout thermocouples in the combustion chamber of the engine is less than the first threshold, and the delay meets the first preset time. The second criterion is that the flameout thermocouple temperature reduction rate of at least two flameout thermocouples in the same combustion chamber is greater than the second threshold, and the delay meets the second preset time. The third criterion is that the difference between the flameout thermocouple temperature of at least two flameout thermocouples in the same combustion chamber and the theoretical value of the flameout thermocouple temperature measurement under the working conditions of the combustion chamber is less than the third threshold, and the delay meets the third preset time. It should be understood that the first threshold to the nineteenth threshold, and the first preset time to the tenth preset time in the present invention can be set according to actual conditions.

[0099] Furthermore, based on the flameout thermocouple temperature, a preset engine flameout criterion is used to determine whether the engine has flamed out, including: determining whether the flameout thermocouple temperature satisfies any one of the first criterion, the second criterion, and the third criterion; if any one of the first criterion, the second criterion, and the third criterion is satisfied, the engine has flamed out.

[0100] Furthermore, for the average value of the flameout thermocouple temperature in the first criterion, in this embodiment, it is determined by a signal conditioning optimization algorithm based on the number of flameout thermocouple monitoring signals, signal quality and flameout thermocouple temperature of each signal. Specifically, the process includes the following steps:

[0101] S301, the signal quality includes normal and abnormal. When the number of signals with normal signal quality is greater than a fourth threshold, the flameout thermocouple temperature average is the average of the flameout thermocouple temperatures of the signals with normal signal quality.

[0102] S302, when the number of signals with normal signal quality is less than or equal to a fourth threshold and greater than a fifth threshold, determining an average flameout thermocouple temperature according to the flameout thermocouple temperature of the signals with normal signal quality and a confidence interval of a preset flameout thermocouple temperature theoretical value.

[0103] Further, the flameout thermocouple temperature average value is determined based on the flameout thermocouple temperature of the signal with normal signal quality and the confidence interval of the flameout thermocouple temperature theoretical value, including:

[0104] S3021, determining an initial flameout thermocouple temperature average value according to the flameout thermocouple temperature of the signal with normal signal quality.

[0105] S3022: If the initial flameout thermocouple temperature average value is within a preset confidence interval of the flameout thermocouple temperature theoretical value, the initial flameout thermocouple temperature average value is used as the flameout thermocouple temperature average value.

[0106] Furthermore, the theoretical value of the flameout thermocouple temperature is determined by formula 1:

[0107] T x =f1(T0,P0,RH,T2,CPR,SPD,IGV,T f ,FR,η F ,η T ,PWR), where T0 is

[0108] Ambient temperature, P0 is ambient atmospheric pressure, RH is ambient atmospheric humidity, T2 is gas turbine compressor outlet temperature, CPR is gas turbine compressor pressure ratio, SPD is gas turbine speed, IGV is gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, η F is the combustion efficiency of the gas turbine, η T is the turbine efficiency of the gas turbine, and PWR is the active power of the gas turbine generator.

[0109] The above formula 1 is an algorithm formula for the theoretical value of the flameout thermocouple temperature of the combustion chamber of the gas engine in full-operation conditions of different speeds, different fuel amounts, different powers, different ambient temperatures and atmospheric pressures, etc. It can be understood that the theoretical value of the flameout thermocouple temperature is comprehensively determined by the various parameters in formula 1 and the function f1.

[0110] The confidence interval of the preset flameout thermocouple temperature theoretical value can be described as, T x *A1%~T x *B1%, the specific A1% and B1% can be determined according to actual needs. For example, the confidence interval of a preset flameout thermocouple temperature theoretical value is T x *96%~T x*105%.

[0111] S3023: If the initial flameout thermocouple temperature average value is greater than an upper limit value of a preset confidence interval of a flameout thermocouple temperature theoretical value, the upper limit value is used as the flameout thermocouple temperature average value.

[0112] S3024: If the initial flameout thermocouple temperature average value is less than a lower limit of a preset confidence interval of a flameout thermocouple temperature theoretical value, the lower limit is used as the flameout thermocouple temperature average value.

[0113] It is understandable that the average value of the flameout thermocouple temperature in the first criterion may also be determined by other methods other than this embodiment.

[0114] S303: When the number of signals with normal signal quality is less than or equal to a fifth threshold, the flameout thermocouple temperature average value is a flameout thermocouple temperature theoretical value.

[0115] For example, the fourth threshold value may be set to 2 / 3 of the total number of all flameout thermocouples in the combustion chamber of the engine; the fifth threshold value may be set to 1 / 3 of the total number of all flameout thermocouples in the combustion chamber of the engine. When the number of signals with normal signal quality is less than or equal to the fifth threshold value, the flameout thermocouple temperature average value is the flameout thermocouple temperature theoretical value, and an alarm is issued that the number of flameout thermocouple abnormal signals exceeds the standard.

[0116] In addition, based on the temperature of the light field multi-spectral thermometer, a preset engine flameout criterion is used to determine whether the engine has flamed out, including: based on the temperature of the light field multi-spectral thermometer or the temperature reduction rate of the light field multi-spectral thermometer, a preset engine flameout criterion is used to determine whether the engine has flamed out.

[0117] Furthermore, the preset engine flameout criterion also includes one or more of the fourth criterion, the fifth criterion and the sixth criterion. The fourth criterion is that the difference between the light field multi-spectral thermometer temperature of at least two light field multi-spectral thermometers in the same combustion chamber and the light field multi-spectral thermometer temperature average value of all light field multi-spectral thermometers in the combustion chamber of the engine is less than the seventh threshold value, and the delay meets the fourth preset time length. The fifth criterion is that the light field multi-spectral thermometer temperature reduction rate of at least two light field multi-spectral thermometers in the same combustion chamber is greater than the eighth threshold value, and the delay meets the fifth preset time length. The sixth criterion is that the difference between the light field multi-spectral thermometer temperature of at least two light field multi-spectral thermometers in the same combustion chamber and the theoretical value of the light field multi-spectral thermometer under the working conditions of the combustion chamber is less than the ninth threshold value, and the delay meets the sixth preset time length.

[0118] Further, based on the temperature of the light field multi-spectral thermometer, a preset engine flameout criterion is used to determine whether the engine flameout occurs, including: determining whether the temperature of the light field multi-spectral thermometer satisfies any one of the fourth criterion, the fifth criterion, and the sixth criterion. If any one of the fourth criterion, the fifth criterion, and the sixth criterion is satisfied, the engine flameout occurs.

[0119] Further, the determination of the light field multi-spectral thermometer temperature average value includes: determining the light field multi-spectral thermometer temperature average value through a signal conditioning optimization algorithm according to the number of light field multi-spectral thermometer monitoring signals, signal quality and the light field multi-spectral thermometer temperature of each signal. Specifically, in this embodiment, the light field multi-spectral thermometer temperature average value is determined through the following steps:

[0120] S310, the signal quality includes normal and abnormal. When the number of signals with normal signal quality is greater than the tenth threshold, the light field multi-spectral thermometer temperature average value is the light field multi-spectral thermometer temperature average value of the signals with normal signal quality.

[0121] S311, when the number of signals with normal signal quality is less than or equal to the tenth threshold and greater than the eleventh threshold, determine the light field multi-spectral thermometer temperature average value based on the light field multi-spectral thermometer temperature of the signals with normal signal quality and the confidence interval of the preset light field multi-spectral thermometer temperature theoretical value.

[0122] S312: When the number of signals with normal signal quality is less than or equal to an eleventh threshold, the average temperature value of the light field multi-spectral thermometer is the theoretical temperature value of the light field multi-spectral thermometer.

[0123] Furthermore, the theoretical temperature value of the light field multi-spectral thermometer is determined by formula 2:

[0124] T comb =f2(T0,P0,RH,T2,CPR,SPD,IGV,T f ,FR,η F ,η T , PWR), where T0 is the ambient temperature, P0 is the ambient atmospheric pressure, RH is the ambient atmospheric humidity, T2 is the gas turbine compressor outlet temperature, CPR is the gas turbine compressor pressure ratio, SPD is the gas turbine speed, IGV is the gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, η F is the combustion efficiency of the gas turbine, η T is the turbine efficiency of the gas turbine, and PWR is the active power of the gas turbine generator.

[0125] The above formula 2 is an algorithm formula for the theoretical temperature value of the light field multi-spectral thermometer in the combustion chamber of the gas engine when the gas engine is running under full operating conditions of different speeds, different fuel amounts, different powers, different ambient temperatures and atmospheric pressures, etc. It can be understood that the theoretical temperature value of the light field multi-spectral thermometer is determined by the various parameters in formula 2 and function f2.

[0126] The confidence interval of the preset light field multi-spectral thermometer temperature theoretical value can be described as, T comb *A1%~T comb *B1%, the specific A1% and B1% can be determined according to actual needs. For example, the confidence interval of the theoretical temperature value of a preset light field multi-spectral thermometer is T comb *98%~T comb *103%.

[0127] For example, the tenth threshold value may be set to 2 / 3 of the total number of all light field multi-spectral thermometers in the combustion chamber of the gas turbine; the eleventh threshold value may be set to 1 / 3 of the total number of all light field multi-spectral thermometers in the combustion chamber of the gas turbine. When the number of signals with normal signal quality is less than or equal to the eleventh threshold value, the average temperature value of the light field multi-spectral thermometer is the theoretical temperature value of the light field multi-spectral thermometer, and an alarm is issued that the number of abnormal signals of the light field multi-spectral thermometer exceeds the standard.

[0128] Furthermore, in order to improve the reliability of the judgment result of whether the fuel engine has been flamed out, when the judgment result obtained by using the preset fuel engine flameout criterion based on the flameout thermocouple temperature to judge whether the fuel engine has been flamed out is inconsistent with the judgment result obtained by using the preset fuel engine flameout criterion based on the light field multi-spectral thermometer temperature to judge whether the fuel engine has been flamed out, the judgment result obtained based on the light field multi-spectral thermometer temperature is selected.

[0129] In addition, based on the flameout thermocouple temperature and the light field multi-spectral thermometer temperature, a preset engine flameout criterion is used to determine whether the engine has flamed out, including: based on any two parameters of the flameout thermocouple temperature, the light field multi-spectral thermometer temperature, the flameout thermocouple temperature reduction rate and the light field multi-spectral thermometer temperature reduction rate, a preset engine flameout criterion is used to determine whether the engine has flamed out.

[0130] Further, the preset engine flameout criterion also includes: one or more of the seventh criterion, the eighth criterion, the ninth criterion and the tenth criterion, the seventh criterion being that at least m flameout thermocouple temperatures among all flameout thermocouple temperatures are lower than the twelfth threshold, and at least n light field multi-spectrum thermometer temperatures among all light field multi-spectrum thermometer temperatures are lower than the thirteenth threshold, and the delay meets the seventh preset duration. The eighth criterion is that at least p flameout thermocouple temperatures among all flameout thermocouple temperatures are lower than the fourteenth threshold, and at least q light field multi-spectrum thermometer temperatures among all light field multi-spectrum thermometer temperatures have a temperature reduction rate greater than the fifteenth threshold, and the delay meets the eighth preset duration. The ninth criterion is that at least r flameout thermocouple temperatures among all flameout thermocouple temperatures have a temperature reduction rate greater than the sixteenth threshold, and at least s light field multi-spectrum thermometer temperatures among all light field multi-spectrum thermometer temperatures are lower than the seventeenth threshold, and the delay meets the ninth preset duration. The tenth criterion is that among all the flameout thermocouple temperatures, there are at least t flameout thermocouple temperatures whose temperature reduction rate is greater than the eighteenth threshold, and among all the light field multi-spectral thermometer temperatures, there are at least u light field multi-spectral thermometer temperatures whose temperature reduction rate is greater than the nineteenth threshold, and the delay meets the tenth preset time length.

[0131] Among them, the number of flameout thermocouples m, p, r, t and the number of light field multi-spectral thermometers n, q, s, u in the above criterion are variables that are adaptively corrected according to the actual operating conditions of the gas turbine. With the increase of the gas turbine speed (SPD) and the operating load, the gas turbine operating conditions are closer to the design point conditions of the gas turbine, the operating parameters are more stable, and the criterion for judging the flameout of the combustion chamber is more stringent. Specifically, the above parameters m, p, r, t are determined by formula three. Formula three, X = f3 (T0, P0, RH, T2, CPR, SPD, IGV, T f ,FR,PWR), T0 is the ambient temperature, P0 is the ambient atmospheric pressure, RH is the ambient atmospheric humidity, T2 is the gas turbine compressor outlet temperature, CPR is the gas turbine compressor pressure ratio, SPD is the gas turbine speed, IGV is the gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, and PWR is the active power of the gas turbine generator. The above parameters n, q, s, and u are determined by formula 4. Formula 4:

[0132] Y=f4(T0,P0,RH,T2,CPR,SPD,IGV,T f ,FR,PWR), where T0 is the ambient temperature, P0 is the ambient atmospheric pressure, RH is the ambient atmospheric humidity, T2 is the gas turbine compressor outlet temperature, CPR is the gas turbine compressor pressure ratio, SPD is the gas turbine speed, IGV is the gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, and PWR is the active power of the gas turbine generator.

[0133] Furthermore, it also includes: when the eleventh criterion is met, the engine flames out, and the eleventh criterion is that the flameout thermocouples of the same combustion chamber or the light field multi-spectral thermometers of the same combustion chamber are both faulty.

[0134] In this embodiment, the above eleven criteria are used to determine whether the engine is flameout. When any of the above criteria is met, it is considered that the engine is flameout. It should be understood that in actual applications, some of the criteria in the present invention can be selected according to the actual preset sensor type and the acquired data to determine whether the engine is flameout.

[0135] like Figure 4 Schematic diagram of a flameout monitoring and protection device for a combustion engine according to an embodiment of the present invention is shown in FIG. The device is used to perform flameout monitoring and protection according to the above method. The device includes: a monitoring module 41, an acquisition module 42 and a judgment module 43. The functions of each module will be introduced below:

[0136] The monitoring module 41 is used to monitor the temperature of the combustion chamber using a preset sensor in the combustion chamber of the combustion engine. The preset sensor includes a flameout thermocouple and / or a light field multi-spectrum thermometer.

[0137] The acquisition module 42 is used to acquire the flameout thermocouple temperature corresponding to the flameout thermocouple and / or the light field multi-spectrum thermometer temperature corresponding to the light field multi-spectrum thermometer.

[0138] The judgment module 43 is used to judge whether the engine has flameout based on the flameout thermocouple temperature and / or the light field multi-spectrum thermometer temperature and using a preset engine flameout criterion.

[0139] It should be understood that a combustion engine flameout monitoring and protection device is consistent with the description of a corresponding combustion engine flameout monitoring and protection method embodiment, so it will not be repeated in this embodiment.

[0140] In summary, it can be seen from the above description that the above embodiments of the present invention achieve the following technical effects:

[0141] 1. The present invention proposes to combine a flameout thermocouple with a light field multi-spectral thermometer to monitor the state of the gas engine, so as to make up for the problem of missed detection and false detection caused by the reduced sensitivity of the optical flame detector due to long-term operation and insufficient arrangement, and can also weaken the problem of reduced reliability caused by the easy damage of the flameout thermocouple alone. In combination with the application of a light field multi-spectral thermometer that characterizes the combustion stability of the combustion chamber, the light field multi-spectral thermometer has the advantages of high precision and high response speed. The combination of the monitoring methods can more effectively and reliably monitor the operating conditions of the combustion chamber of the gas engine, more accurately judge the occurrence of flameout failure, and then take flameout protection more promptly and effectively, reducing the risk and loss of serious safety accidents that may be caused by ignition failure or flameout of the combustion chamber.

[0142] 2. The present invention provides corresponding preset engine flameout criteria to determine whether the engine has flamed out, namely, setting a flameout thermocouple alone, setting a light field multi-spectral thermometer temperature alone, or combining a flameout thermocouple with a light field multi-spectral thermometer. When one of the criteria is met, it is considered that the engine has flamed out. The method and device detect the engine status from multiple angles, which can reduce the problem of missed detection and improve the reliability of the detection method.

[0143] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0144] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0145] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, which can be embodied in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processor or other system that can fetch instructions from an instruction execution system, apparatus or device and execute instructions), or used in combination with these instruction execution systems, apparatuses or devices.

[0146] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0147] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A method for monitoring and protecting a combustion engine flameout, characterized in that: include: The temperature of the combustion chamber is monitored by using a preset sensor in the combustion chamber of the combustion engine, wherein the preset sensor includes a flameout thermocouple and / or a light field multi-spectrum thermometer; Obtaining a flameout thermocouple temperature corresponding to the flameout thermocouple and / or a light field multi-spectrum thermometer temperature corresponding to the light field multi-spectrum thermometer; Based on the flameout thermocouple temperature and / or the light field multi-spectrum thermometer temperature, a preset flameout criterion of the fuel engine is used to determine whether the fuel engine has flameout.

2. The method according to claim 1, characterized in that The combustion chamber of the gas engine comprises a fuel nozzle, a combustion chamber, a transition section and an outlet. The flameout thermocouple is arranged at one end of the fuel nozzle, and the light field multi-spectrum thermometer is arranged on the inner wall of the combustion chamber.

3. The method according to claim 2, characterized in that The light field multi-spectral thermometers are arranged at equal intervals on the inner wall of the combustion chamber in the circumferential direction.

4. The method according to claim 1, characterized in that: Based on the flameout thermocouple temperature, using a preset flameout criterion of the combustion engine to determine whether the combustion engine has flameout, the method includes: Based on the flameout thermocouple temperature or the flameout thermocouple temperature reduction rate, a preset engine flameout criterion is used to determine whether the engine flameout occurs.

5. The method according to claim 4, characterized in that The preset engine flameout criterion includes one or more of a first criterion, a second criterion and a third criterion. The first criterion is that the difference between the flameout thermocouple temperatures of at least two flameout thermocouples in the same combustion chamber and the average flameout thermocouple temperatures of all flameout thermocouples in the combustion chamber of the combustion engine is less than a first threshold, and the delay meets a first preset time length; The second criterion is that there are at least two flameout thermocouples in the same combustion chamber whose flameout thermocouple temperature reduction rate is greater than a second threshold value, and the delay meets a second preset time length; The third criterion is that the difference between the flameout thermocouple temperatures of at least two flameout thermocouples in the same combustion chamber and the flameout thermocouple temperature measurement theoretical value under the combustion chamber operating conditions is less than a third threshold, and the delay meets a third preset time length.

6. The method according to claim 5, characterized in that Based on the flameout thermocouple temperature, using a preset flameout criterion of the combustion engine to determine whether the combustion engine has flameout, the method includes: Determining whether the flameout thermocouple temperature satisfies any one of the first criterion, the second criterion and the third criterion; If any one of the first criterion, the second criterion and the third criterion is satisfied, the combustion engine is turned off.

7. The method according to claim 5, characterized in that The determination of the flameout thermocouple temperature average value includes: According to the number of the flameout thermocouple monitoring signals, the signal quality and the flameout thermocouple temperature of each signal, the flameout thermocouple temperature average value is determined by a signal conditioning optimization algorithm.

8. The method according to claim 7, characterized in that According to the number of the flameout thermocouple monitoring signals, the signal quality and the flameout thermocouple temperature of each signal, the flameout thermocouple temperature average value is determined by a signal conditioning optimization algorithm, including: The signal quality includes normal and abnormal. When the number of signals with normal signal quality is greater than a fourth threshold, the flameout thermocouple temperature average is the average of the flameout thermocouple temperatures of the signals with normal signal quality. When the number of signals with normal signal quality is less than or equal to a fourth threshold value and greater than a fifth threshold value, determining the flameout thermocouple temperature average value according to the flameout thermocouple temperature of the signals with normal signal quality and a confidence interval of a preset flameout thermocouple temperature theoretical value; When the number of signals with normal signal quality is less than or equal to a fifth threshold, the flameout thermocouple temperature average value is the flameout thermocouple temperature theoretical value.

9. The method according to claim 8, characterized in that The fourth threshold is 2 / 3 of the total number of all flameout thermocouples in the combustion chamber of the gas engine; the fifth threshold is 1 / 3 of the total number of all flameout thermocouples in the combustion chamber of the gas engine.

10. The method according to claim 8, characterized in that Determining the flameout thermocouple temperature average value according to the flameout thermocouple temperature of the signal with normal signal quality and the confidence interval of the flameout thermocouple temperature theoretical value includes: Determining an initial flameout thermocouple temperature average value according to the flameout thermocouple temperature of the signal with normal signal quality; If the initial flameout thermocouple temperature average value is within the confidence interval of the preset flameout thermocouple temperature theoretical value, the initial flameout thermocouple temperature average value is used as the flameout thermocouple temperature average value; If the initial flameout thermocouple temperature average value is greater than the upper limit value of the confidence interval of the preset flameout thermocouple temperature theoretical value, the upper limit value is used as the flameout thermocouple temperature average value; If the initial flameout thermocouple temperature average value is less than the lower limit value of the confidence interval of the preset flameout thermocouple temperature theoretical value, the lower limit value is used as the flameout thermocouple temperature average value.

11. The method according to claim 8, characterized in that The flameout thermocouple temperature theoretical value is determined by formula 1, wherein: T x =f1(T0,P0,RH,T2,CPR,SPD,IGV,T f ,FR,the F ,or T ,PWR),among them, T0 is the ambient temperature, P0 is the ambient atmospheric pressure, RH is the ambient atmospheric humidity, T2 is the gas turbine compressor outlet temperature, CPR is the gas turbine compressor pressure ratio, SPD is the gas turbine speed, IGV is the gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, η F is the combustion efficiency of the gas turbine, η T is the turbine efficiency of the gas turbine, and PWR is the active power of the gas turbine generator.

12. The method according to any one of claims 1 to 11, characterized in that: Based on the temperature of the light field multi-spectral thermometer, using a preset engine flameout criterion to determine whether the engine flameout occurs, the method includes: Based on the temperature of the light field multi-spectral thermometer or the temperature reduction rate of the light field multi-spectral thermometer, a preset engine flameout criterion is used to determine whether the engine flameout occurs.

13. The method according to claim 12, characterized in that The preset engine flameout criterion also includes one or more of the fourth criterion, the fifth criterion and the sixth criterion. The fourth criterion is that the difference between the light field multi-spectral thermometer temperature of at least two light field multi-spectral thermometers in the same combustion chamber and the light field multi-spectral thermometer temperature average of all light field multi-spectral thermometers in the combustion chamber of the gas turbine is less than the seventh threshold value, and the delay meets the fourth preset time length; The fifth criterion is that there are at least two light field multi-spectral thermometers in the same combustion chamber, the temperature reduction rate of which is greater than the eighth threshold, and the delay meets the fifth preset time length; The sixth criterion is that the difference between the light field multi-spectral thermometer temperatures of at least two light field multi-spectral thermometers in the same combustion chamber and the theoretical values ​​of the light field multi-spectral thermometers under the working conditions of the combustion chamber is less than the ninth threshold, and the delay meets the sixth preset time length.

14. The method according to claim 13, characterized in that Based on the temperature of the light field multi-spectral thermometer, using a preset engine flameout criterion to determine whether the engine flameout occurs, the method includes: Determine whether the temperature of the light field multi-spectral thermometer satisfies any one of the fourth criterion, the fifth criterion and the sixth criterion; If any one of the fourth criterion, the fifth criterion and the sixth criterion is satisfied, the combustion engine is turned off.

15. The method according to claim 13, characterized in that The determination of the average temperature of the light field multi-spectral thermometer includes: According to the number of light field multi-spectral thermometer monitoring signals, signal quality and the light field multi-spectral thermometer temperature of each signal, the light field multi-spectral thermometer temperature average value is determined by a signal conditioning optimization algorithm.

16. The method according to claim 15, characterized in that According to the number of monitoring signals of the light field multi-spectral thermometer, the signal quality and the light field multi-spectral thermometer temperature of each signal, the average temperature of the light field multi-spectral thermometer is determined by a signal conditioning optimization algorithm, including: The signal quality includes normal and abnormal, and when the number of signals with normal signal quality is greater than a tenth threshold, the light field multi-spectrum thermometer temperature average value is the light field multi-spectrum thermometer temperature average value of the signals with normal signal quality; When the number of signals with normal signal quality is less than or equal to the tenth threshold value and greater than the eleventh threshold value, the light field multi-spectral thermometer temperature average value is determined according to the light field multi-spectral thermometer temperature of the signals with normal signal quality and the confidence interval of the preset light field multi-spectral thermometer temperature theoretical value; When the number of signals with normal signal quality is less than or equal to an eleventh threshold, the average temperature value of the light field multi-spectrum thermometer is the theoretical temperature value of the light field multi-spectrum thermometer.

17. The method according to claim 16, characterized in that The theoretical temperature value of the light field multi-spectral thermometer is determined by formula 2, where: T comb = f2(T0, P0, RH, T2, CPR, SPD, IGV, T f , FR, η F , η T , PWR), where middle, T0 is the ambient temperature, P0 is the ambient atmospheric pressure, RH is the ambient atmospheric humidity, T2 is the gas turbine compressor outlet temperature, CPR is the gas turbine compressor pressure ratio, SPD is the gas turbine speed, IGV is the gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, η F is the combustion efficiency of the gas turbine, η T is the turbine efficiency of the gas turbine, and PWR is the active power of the gas turbine generator.

18. The method according to any one of claims 13 to 17, characterized in that Based on the flameout thermocouple temperature and the light field multi-spectrum thermometer temperature, using a preset flameout criterion of the combustion engine to determine whether the combustion engine has flameout, the method includes: Based on any two parameters of the flameout thermocouple temperature, the light field multi-spectrum thermometer temperature, the flameout thermocouple temperature reduction rate and the light field multi-spectrum thermometer temperature reduction rate, a preset engine flameout criterion is used to determine whether the engine has flameout.

19. The method according to claim 18, characterized in that The preset engine flameout criterion also includes: one or more of the seventh criterion, the eighth criterion, the ninth criterion and the tenth criterion, The seventh criterion is that at least m of all flameout thermocouple temperatures are lower than the twelfth threshold, and at least n of all light field multi-spectrum thermometer temperatures are lower than the thirteenth threshold, and the delay meets the seventh preset duration; The eighth criterion is that among all the flameout thermocouple temperatures, at least p flameout thermocouple temperatures are lower than the fourteenth threshold, and among all the light field multi-spectrum thermometer temperatures, at least q light field multi-spectrum thermometer temperatures have a temperature decrease rate greater than the fifteenth threshold, and the delay meets the eighth preset time length; The ninth criterion is that among all the flameout thermocouple temperatures, at least r flameout thermocouple temperatures have a temperature decrease rate greater than the sixteenth threshold, and among all the light field multi-spectrum thermometer temperatures, at least s light field multi-spectrum thermometer temperatures have a temperature less than the seventeenth threshold, and the delay meets the ninth preset time length; The tenth criterion is that among all the flameout thermocouple temperatures, there are at least t flameout thermocouple temperatures whose temperature reduction rate is greater than the eighteenth threshold, and among all the light field multi-spectral thermometer temperatures, there are at least u light field multi-spectral thermometer temperatures whose temperature reduction rate is greater than the nineteenth threshold, and the delay meets the tenth preset time length.

20. The method according to claim 19, characterized in that The parameters m, p, r, t are determined by formula 3, where: X=f3(T0,P0,RH,T2,CPR,SPD,IGV,T f ,FR,PWR), where T0 is Ambient temperature, P0 is ambient atmospheric pressure, RH is ambient atmospheric humidity, T2 is gas turbine compressor outlet temperature, CPR is gas turbine compressor pressure ratio, SPD is gas turbine speed, IGV is gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, and PWR is the active power of the gas turbine generator; The parameters n, q, s, and u are determined by formula 4, where: Y=f4(T0,P0,RH,T2,CPR,SPD,IGV,T f ,FR,PWR), where T0 is the ambient temperature, P0 is the ambient atmospheric pressure, RH is the ambient atmospheric humidity, T2 is the gas turbine compressor outlet temperature, CPR is the gas turbine compressor pressure ratio, SPD is the gas turbine speed, IGV is the gas turbine adjustable inlet guide vane opening, T f is the fuel temperature, FR is the fuel quantity, and PWR is the active power of the gas turbine generator.

21. The method according to claim 19, characterized in that Also includes: When the eleventh criterion is met, the combustion engine flames out, and the eleventh criterion is that the flameout thermocouple in the same combustion chamber or the light field multi-spectral thermometer in the same combustion chamber fails.

22. The method according to claim 21, characterized in that Also includes: When the judgment result obtained by judging whether the fuel engine has been flamed out based on the flameout thermocouple temperature and using the preset fuel engine flameout criterion is inconsistent with the judgment result obtained by judging whether the fuel engine has been flamed out based on the light field multi-spectral thermometer temperature and using the preset fuel engine flameout criterion, the judgment result based on the light field multi-spectral thermometer temperature is selected.

23. A combustion engine flameout monitoring and protection device, characterized in that: The device is used for flameout monitoring protection according to the method described in any one of claims 1 to 22, and the device comprises: A monitoring module, used to monitor the temperature of the combustion chamber using a preset sensor in the combustion chamber of the combustion engine, wherein the preset sensor includes a flameout thermocouple and / or a light field multi-spectrum thermometer; An acquisition module, used for acquiring a flameout thermocouple temperature corresponding to the flameout thermocouple, and / or a light field multi-spectrum thermometer temperature corresponding to the light field multi-spectrum thermometer; The judgment module is used to judge whether the combustion engine has been flamed out based on the flameout thermocouple temperature and / or the light field multi-spectrum thermometer temperature and using a preset combustion engine flameout criterion.

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