Online monitoring method and device for combustion oscillation of combustion chamber and storage medium

Abstract

The invention discloses an online monitoring method and device for combustion oscillation of a combustion chamber and a storage medium, and the method comprises the steps: obtaining a time domain vibration signal and a pulsating pressure signal of the combustion chamber in the operation process of a gas turbine through a vibration acceleration sensor and a pulsating pressure sensor of the combustion chamber; performing fast Fourier transform on the time domain vibration signal and the pulsating pressure signal to obtain a frequency domain vibration signal and a frequency domain pulsating pressure signal; performing frequency segmentation based on the frequency domain vibration signal and the frequency domain pulsating pressure signal, and determining at least one target frequency band; determining a characteristic value of the target frequency band based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band; and determining a combustion oscillation fault result of the combustion chamber based on the characteristic value of the at least one target frequency band. Therefore, the monitoring rate of combustion oscillation is improved, the monitoring range is wider, support is provided for accurate and reliable combustion mode adjustment and gas turbine protection of the gas turbine, and the service life of the combustion chamber is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of fault monitoring, and in particular to a method, device and storage medium for online monitoring of combustion oscillation in a combustion chamber. Background Art

[0002] At present, gas turbine combustion chambers are increasingly adopting premixed combustion modes to reduce NOx emissions and improve the combustion efficiency of gas turbines. However, the premixed combustion mode is an unstable combustion mode that is prone to oscillation caused by the interaction between sound waves, fluids and heat release, namely thermal instability or combustion pulsation. Among them, combustion pulsation can cause large vibrations, causing thermal and mechanical stress fatigue of flow-through components, causing damage to combustion chamber components, reducing the overall performance of the system and reducing the service life of the combustion chamber. For example, when low-frequency and high-amplitude combustion pressure pulsations occur, it will cause flow and combustion instability, and in severe cases, cause problems such as backfire and flameout in the combustion chamber, resulting in shutdown accidents.

[0003] In the prior art, combustion pulsation pressure signals can be used to detect combustion oscillations. However, since the pulsation pressure sensor is installed inside the combustion chamber, when the pulsation pressure sensor fails, the combustion chamber needs to be shut down and cooled to replace the sensor, otherwise the combustion oscillation cannot be monitored, which has strong limitations. In addition, the damage to the combustion chamber components is mainly due to fatigue caused by large vibrations. The pulsation pressure cannot determine the actual vibration size of the combustion chamber components, and cannot accurately determine whether combustion oscillations occur in a timely manner and make protection judgments, thereby reducing the service life of the combustion chamber. Summary of the invention

[0004] The present invention provides a method and device for online monitoring of combustion oscillation in a combustion chamber, so as to solve the technical problem of low response accuracy in the above-mentioned prior art.

[0005] To this end, the present invention proposes an online monitoring method for combustion oscillation in a combustion chamber. The combustion oscillation can be monitored through the vibration signal and the pulsating pressure signal of the combustion chamber of a gas turbine. When the pulsating pressure sensor fails, the combustion oscillation in the combustion chamber can still be monitored, thereby improving the monitoring rate of the combustion oscillation and providing a wider monitoring range. Not only can the combustion oscillation be monitored, but also the mechanical vibration and fatigue damage of the combustion chamber components can be monitored. Therefore, it is possible to timely and accurately determine whether combustion oscillation occurs, and provide support for accurate and reliable combustion mode adjustment and engine protection of the gas turbine, thereby increasing the service life of the combustion chamber.

[0006] Another object of the present invention is to provide an on-line monitoring device for combustion oscillations in a combustion chamber.

[0007] To achieve the above object, the present invention provides a method for online monitoring of combustion oscillations in a combustion chamber, the method comprising:

[0008] The time domain vibration signal and pulsation pressure signal of the combustion chamber during the operation of the gas turbine are obtained through the vibration acceleration sensor and pulsation pressure sensor of the combustion chamber;

[0009] Performing fast Fourier transform on the time-domain vibration signal and the pulsating pressure signal to obtain a frequency-domain vibration signal and a frequency-domain pulsating pressure signal;

[0010] Perform frequency segmentation based on the frequency domain vibration signal and the frequency domain pulsating pressure signal to determine at least one target frequency band;

[0011] Determining a characteristic value of the target frequency band based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band;

[0012] Based on the characteristic value of the at least one target frequency band, a combustion oscillation fault result of the combustion chamber is determined.

[0013] The combustion chamber combustion oscillation online monitoring method of the embodiment of the present invention may also have the following additional technical features:

[0014] In one embodiment of the present invention, the time domain vibration signal and the pulsating pressure signal of the combustion chamber during the operation of the combustion engine are obtained by using the vibration acceleration sensor and the pulsating pressure sensor of the combustion chamber, including:

[0015] Obtaining a vibration acceleration signal through at least one vibration acceleration sensor within a threshold range of the combustion chamber;

[0016] Obtaining a raw pulsating pressure signal through at least one pulsating pressure sensor within a threshold range of the combustion chamber;

[0017] The vibration acceleration signal and the original pulsating pressure signal are subjected to signal conversion and filtering processing to obtain a time domain vibration signal and a pulsating pressure signal of the combustion chamber during the operation of the combustion engine.

[0018] In one embodiment of the present invention, the characteristic value includes a vibration signal characteristic value and a pulsating pressure signal characteristic value; the determining the characteristic value of the target frequency band based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band includes:

[0019] Determine the maximum value of the frequency domain vibration signal and the maximum value of the frequency domain pulsating pressure signal in the target frequency band based on the frequency domain vibration signal and the frequency domain pulsating pressure signal in the target frequency band;

[0020] The maximum value of the frequency domain vibration signal and the maximum value of the frequency domain pulsating pressure signal in the target frequency band are determined as the characteristic value of the vibration signal and the characteristic value of the pulsating pressure signal in the target frequency band.

[0021] In one embodiment of the present invention, the determining of the combustion oscillation fault result of the combustion chamber based on the characteristic value of the at least one target frequency band includes:

[0022] Determine the alarm threshold and the trip threshold of each target frequency band, wherein the alarm threshold includes the vibration signal alarm threshold and the pulsating pressure signal alarm threshold, and the trip threshold includes the vibration signal trip threshold and the pulsating pressure signal trip threshold;

[0023] Determining the alarm condition and the trip condition of the combustion chamber based on the alarm threshold and the trip threshold of each target frequency band;

[0024] If the characteristic value of the target frequency band meets the corresponding alarm condition, a combustion chamber combustion oscillation alarm is triggered;

[0025] If the characteristic value in the target frequency band meets the corresponding tripping condition, the combustion oscillation tripping protection action is triggered;

[0026] If the characteristic value in the target frequency band does not meet the alarm condition and the trip condition, the output is no combustion chamber combustion oscillation.

[0027] In one embodiment of the present invention, the determining the alarm condition and the trip condition of the combustion chamber based on the alarm threshold and the trip threshold of each target frequency band includes:

[0028] Determining the quantity thresholds corresponding to the alarm conditions and the trip conditions of the combustion chamber based on the alarm thresholds and the trip thresholds of the target frequency bands;

[0029] Based on the quantity thresholds corresponding to the alarm condition and the trip condition of the combustion chamber, the alarm condition and the trip condition of the combustion chamber are determined.

[0030] In one embodiment of the present invention, the determining of the combustion oscillation fault result of the combustion chamber based on the characteristic value of the at least one target frequency band includes:

[0031] Determine the fault rule table based on the characteristic values ​​of historical fault data;

[0032] Based on the characteristic value of the at least one target frequency band and the fault rule table, a combustion oscillation fault result of the combustion chamber is determined.

[0033] To achieve the above object, the present invention provides, on the other hand, a combustion chamber combustion oscillation online monitoring device, the device comprising:

[0034] An acquisition module is used to acquire a time domain vibration signal and a pulsating pressure signal of the combustion chamber during the operation of the combustion engine through a vibration acceleration sensor and a pulsating pressure sensor of the combustion chamber;

[0035] A data processing module, used for performing fast Fourier transform on the time-domain vibration signal and the pulsating pressure signal to obtain a frequency-domain vibration signal and a frequency-domain pulsating pressure signal;

[0036] A frequency segmentation module, used to perform frequency segmentation based on the frequency domain vibration signal and the frequency domain pulsating pressure signal to determine at least one target frequency band;

[0037] A first determination module, configured to determine a characteristic value of the target frequency band based on a frequency domain vibration signal and a frequency domain pulsating pressure signal of the target frequency band;

[0038] The second determination module is used to determine the combustion oscillation fault result of the combustion chamber based on the characteristic value of the at least one target frequency band.

[0039] In one embodiment of the present invention, the acquisition module is specifically used to:

[0040] Obtaining a vibration acceleration signal through at least one vibration acceleration sensor within a threshold range of the combustion chamber;

[0041] Obtaining a raw pulsating pressure signal through at least one pulsating pressure sensor within a threshold range of the combustion chamber;

[0042] The vibration acceleration signal and the original pulsating pressure signal are subjected to signal conversion and filtering processing to obtain a time domain vibration signal and a pulsating pressure signal of the combustion chamber during the operation of the combustion engine.

[0043] Another object of the present invention is to provide an electronic device, comprising:

[0044] at least one processor; and

[0045] a memory communicatively connected to the at least one processor; wherein,

[0046] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform any one of the methods described in the above aspect.

[0047] Another object of the present invention is to provide a computer storage medium, wherein the computer storage medium stores computer executable instructions; after the computer executable instructions are executed by a processor, the computer executes any one of the methods described in the above aspect.

[0048] The combustion chamber combustion oscillation online monitoring method, device and storage medium of the embodiment of the present invention obtains the time domain vibration signal and pulsating pressure signal of the combustion chamber during the operation of the gas engine through the vibration acceleration sensor and pulsating pressure sensor of the combustion chamber; performs fast Fourier transform on the time domain vibration signal and the pulsating pressure signal to obtain the frequency domain vibration signal and the frequency domain pulsating pressure signal; performs frequency segmentation based on the frequency domain vibration signal and the frequency domain pulsating pressure signal to determine at least one target frequency band; determines the characteristic value of the target frequency band based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band; determines the combustion oscillation fault result of the combustion chamber based on the characteristic value of at least one target frequency band. Therefore, the present invention monitors the combustion oscillation through the vibration signal and pulsating pressure signal of the gas turbine combustion chamber. When the pulsating pressure sensor fails, the combustion oscillation of the combustion chamber can still be monitored, thereby improving the monitoring rate of combustion oscillation and providing a wider monitoring range. Not only can the combustion oscillation be monitored, but also the mechanical vibration and fatigue damage of the combustion chamber components can be monitored, so as to timely and accurately determine whether combustion oscillation occurs, and provide support for the gas turbine to accurately and reliably adjust the combustion mode and protect the engine, thereby increasing the service life of the combustion chamber.

[0049] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0051] Figure 1 is a flow chart of a method for online monitoring of combustion oscillations in a combustion chamber according to an embodiment of the present invention;

[0052] Figure 2 is a schematic diagram of a target frequency band according to an embodiment of the present invention;

[0053] Figure 3 is a structural diagram of a combustion chamber combustion oscillation online monitoring device according to an embodiment of the present invention;

[0054] Figure 4 It is a block diagram of an electronic device suitable for executing a method for online monitoring of combustion chamber combustion oscillations according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0055] 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.

[0056] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0057] The following describes a method and device for online monitoring of combustion oscillations in a combustion chamber according to an embodiment of the present invention with reference to the accompanying drawings.

[0058] Figure 1 It is a flow chart of a method for online monitoring combustion oscillation of a combustion chamber according to an embodiment of the present invention.

[0059] like Figure 1 As shown, the method includes:

[0060] S1, obtaining the time domain vibration signal and pulsation pressure signal of the combustion chamber during the operation of the gas turbine through the vibration acceleration sensor and pulsation pressure sensor of the combustion chamber;

[0061] In one embodiment of the present invention, the execution subject of the above-mentioned combustion chamber combustion oscillation online monitoring method is a combustion chamber combustion oscillation online monitoring device, which can be implemented by software and / or hardware. The combustion chamber combustion oscillation online monitoring device in this embodiment can be configured in an electronic device. In this example embodiment, the electronic device may include devices such as terminal devices and servers, and this embodiment does not limit the electronic device.

[0062] Among them, in one embodiment of the present invention, the method for obtaining the time domain vibration signal and the pulsating pressure signal of the combustion chamber during the operation of the combustion engine through the vibration acceleration sensor and the pulsating pressure sensor of the combustion chamber may include the following steps:

[0063] S11, obtaining a vibration acceleration signal through at least one vibration acceleration sensor within a first threshold range of the combustion chamber;

[0064] S12, obtaining an original pulsating pressure signal through at least one pulsating pressure sensor within a second threshold range of the combustion chamber;

[0065] S13, performing signal conversion and filtering processing on the vibration acceleration signal and the original pulsating pressure signal to obtain the time domain vibration signal and pulsating pressure signal of the combustion chamber during the operation of the gas turbine.

[0066] In one embodiment of the present invention, the displacement signal and velocity signal of the vibration vary less than the acceleration signal. Based on this, measuring the vibration acceleration signal can more accurately obtain the vibration condition of the engine.

[0067] Furthermore, in one embodiment of the present invention, the first threshold range can be set as required, wherein the first threshold range and the second threshold range can be the same or different.

[0068] Furthermore, in one embodiment of the present invention, after obtaining the vibration acceleration signal and the original pulsating pressure signal of the combustion chamber, the vibration acceleration signal and the original pulsating pressure signal can be converted and filtered to obtain the time domain vibration signal and pulsating pressure signal of the combustion chamber during the operation of the engine. In one embodiment of the present invention, the analog signal of the sensor can be converted into a digital signal by using a signal conditioning device connected to the vibration acceleration sensor and the pulsating pressure sensor, respectively, and the vibration acceleration signal and the original pulsating pressure signal of the vibration acceleration sensor and the pulsating pressure sensor can be filtered and isolated to filter out abnormal interference signals such as mutations in the original signal, so as to obtain the time domain vibration signal and pulsating pressure signal of the combustion chamber during the operation of the engine.

[0069] S2, performing fast Fourier transform on the time domain vibration signal and the pulsating pressure signal to obtain a frequency domain vibration signal and a frequency domain pulsating pressure signal;

[0070] In one embodiment of the present invention, after obtaining the time domain vibration signal and the pulsating pressure signal through the above steps, the time domain vibration signal and the pulsating pressure signal can be subjected to fast Fourier transform to obtain the frequency domain vibration signal and the frequency domain pulsating pressure signal.

[0071] In one embodiment of the present invention, before performing fast Fourier transform on the time domain vibration signal and the pulsating pressure signal to obtain the frequency domain vibration signal and the frequency domain pulsating pressure signal, the method may further include: determining the number of fast Fourier transform points.

[0072] Specifically, in one embodiment of the present invention, the number of points N used for the fast Fourier transform of the time domain vibration signal and the pulsating pressure signal is required to be an integer power of 2, but it should not be too large or too small. If N is too small, a fence effect will occur, that is, the frequency resolution in the frequency domain is insufficient and certain frequency components cannot be distinguished; if N is too large, not only additional calculations will be added, but also the spectrum will be incorrect. Based on this, the number of points N of the fast Fourier transform can be determined according to the frequency resolution F. Among them, in one embodiment of the present invention, the number of points N of the fast Fourier transform can be determined according to the relationship between the number of points and the frequency resolution, wherein the relationship is:

[0073] N ≥ f s / F

[0074] Among them, f s is the sampling frequency and F is the frequency resolution.

[0075] S3, performing frequency segmentation based on the frequency domain vibration signal and the frequency domain pulsating pressure signal to determine at least one target frequency band;

[0076] In one embodiment of the present invention, after obtaining the frequency domain vibration signal and the frequency domain pulsating pressure signal through the above steps, frequency segmentation can be performed based on the frequency domain vibration signal and the frequency domain pulsating pressure signal to determine at least one target frequency band. In one embodiment of the present invention, the frequency bands of the frequency domain vibration signal and the frequency domain pulsating pressure signal for frequency segmentation should be consistent.

[0077] Specifically, in one embodiment of the present invention, the frequency domain vibration signal and the frequency domain pulsating pressure signal may be frequency segmented according to a known resonance mode of the combustion chamber to determine at least one target frequency band. Also, in another embodiment of the present invention, the frequency domain vibration signal and the frequency domain pulsating pressure signal may be frequency segmented according to a fixed or randomly determined frequency interval to determine at least one target frequency band. Figure 2 A schematic diagram of a target frequency band provided by an embodiment of the present disclosure. Figure 2 As shown in the first target frequency band 116f 1 , the second target frequency band 117f 2 、The third target frequency band 118f 3 and the fourth target frequency band 119f 4 It should be noted that, in one embodiment of the present invention, the width of each target frequency band is not fixed, and may be the same or different.

[0078] S4, determining a characteristic value of the target frequency band based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band;

[0079] Among them, in one embodiment of the present invention, after the target frequency band is determined through the above steps, the characteristic value of the target frequency band can be determined based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band. In one embodiment of the present invention, the above characteristic value can include the vibration signal characteristic value and the pulsating pressure signal characteristic value.

[0080] Specifically, in one embodiment of the present invention, the method for determining the characteristic value of the target frequency band based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band may include the following steps:

[0081] S41, determining a maximum value of a frequency domain vibration signal and a maximum value of a frequency domain pulsating pressure signal in the target frequency band based on the frequency domain vibration signal and the frequency domain pulsating pressure signal in the target frequency band;

[0082] S42, determining the maximum value of the frequency domain vibration signal and the maximum value of the frequency domain pulsating pressure signal in the target frequency band as the characteristic value of the vibration signal and the characteristic value of the pulsating pressure signal in the target frequency band.

[0083] For example, in one embodiment of the present invention, it is assumed that the target frequency band includes f 1 , f 2 , …, f z , and each target frequency band f 1 , f 2 , …, f z The maximum value of the frequency domain vibration signal within is vib max1 ,vib max2 , …, vib maxz , the maximum value of the frequency domain pulsating pressure signal p max1 , p max2 ,…,p maxz , then Table 1 is a correspondence table of vibration signal characteristic values ​​and pulsating pressure signal characteristic values ​​in a target frequency band proposed by an embodiment of the present invention.

[0084] Table 1

[0085]

[0086] S5, determining a combustion oscillation fault result of the combustion chamber based on a characteristic value of at least one target frequency band.

[0087] In one embodiment of the present invention, after determining the characteristic value of at least one target frequency band through the above steps, the combustion oscillation fault result of the combustion chamber can be determined based on the characteristic value of at least one target frequency band.

[0088] In one embodiment of the present invention, the method for determining the combustion oscillation fault result of the combustion chamber based on the characteristic value of at least one target frequency band may include the following steps:

[0089] S51, determining an alarm threshold and a trip threshold of each target frequency band, wherein the alarm threshold includes a vibration signal alarm threshold and a pulsating pressure signal alarm threshold, and the trip threshold includes a vibration signal trip threshold and a pulsating pressure signal trip threshold;

[0090] S52, determining the alarm condition and the trip condition of the combustion chamber based on the alarm threshold and the trip threshold of each target frequency band;

[0091] S53, if the characteristic value in the target frequency band meets the corresponding alarm condition, a combustion chamber combustion oscillation alarm is triggered;

[0092] S54, if the characteristic value in the target frequency band meets the corresponding tripping condition, a combustion oscillation tripping protection action is triggered;

[0093] S55, if the characteristic value in the target frequency band does not meet the alarm condition and the trip condition, then the output is no combustion chamber combustion oscillation.

[0094] In one embodiment of the present invention, Table 2 is a corresponding relationship table of alarm thresholds and trip thresholds for each target frequency band proposed in the embodiment of the present invention.

[0095] Table 2

[0096]

[0097] As shown in Table 2, each target frequency band f 1 , f 2 , …, f z The vibration signal and pulsating pressure signal are used to set the corresponding alarm threshold and trip threshold.

[0098] In one embodiment of the present invention, the alarm threshold and the trip threshold of each target frequency band may be determined by historical data or manual experience.

[0099] Furthermore, in one embodiment of the present invention, after obtaining the alarm threshold and trip threshold of each target frequency band through the above steps, the alarm condition and trip condition of the combustion chamber can be determined based on the alarm threshold and trip threshold of each target frequency band as needed.

[0100] Specifically, in one embodiment of the present invention, the method for determining the alarm condition and the trip condition of the combustion chamber based on the alarm threshold and the trip threshold of each target frequency band may include the following steps:

[0101] Step 1: Based on the alarm threshold and trip threshold of each target frequency band, determine the quantity threshold corresponding to the alarm condition and trip condition of the combustion chamber;

[0102] Step 2: Based on the quantity thresholds corresponding to the alarm conditions and the trip conditions of the combustion chamber, determine the alarm conditions and the trip conditions of the combustion chamber.

[0103] In one embodiment of the present invention, the number thresholds corresponding to the alarm conditions and the trip conditions of the combustion chamber can be determined as needed. For example, the number thresholds corresponding to the alarm conditions and the trip conditions of the combustion chamber are 1, or the number thresholds corresponding to the alarm conditions and the trip conditions of the combustion chamber are 5.

[0104] And, in one embodiment of the present invention, after determining the quantity thresholds corresponding to the alarm conditions and the trip conditions of the combustion chamber through the above steps, the alarm conditions and the trip conditions of the combustion chamber can be determined based on the quantity thresholds corresponding to the alarm conditions and the trip conditions of the combustion chamber. Wherein, in one embodiment of the present invention, based on the quantity threshold corresponding to the alarm conditions of the combustion chamber, the determined alarm conditions of the combustion chamber may include: the vibration signal characteristic values ​​and / or the pulsating pressure signal characteristic values ​​of the quantity threshold target frequency bands exceed the corresponding alarm threshold. And, in one embodiment of the present invention, based on the quantity threshold corresponding to the trip conditions of the combustion chamber, the determined trip conditions of the combustion chamber may include: the vibration signal characteristic values ​​and / or the pulsating pressure signal characteristic values ​​of the quantity threshold target frequency bands exceed the corresponding trip threshold.

[0105] For example, assuming that the quantitative thresholds corresponding to the alarm conditions and trip conditions of the combustion chamber are 1, the alarm condition of the combustion chamber is that the vibration signal characteristic value and / or the pulsating pressure signal characteristic value of a single target frequency band exceeds the corresponding alarm threshold, and the trip condition of the combustion chamber is that the vibration signal characteristic value and / or the pulsating pressure signal characteristic value of a single target frequency band exceeds the corresponding trip threshold; assuming that the quantitative thresholds corresponding to the alarm conditions and the trip conditions of the combustion chamber are 5, the alarm condition of the combustion chamber is that the vibration signal characteristic value and / or the pulsating pressure signal characteristic value of 5 target frequency bands exceed the corresponding alarm threshold, and the trip condition of the combustion chamber is that the vibration signal characteristic value and / or the pulsating pressure signal characteristic value of 5 target frequency bands exceed the corresponding trip threshold.

[0106] And, in another embodiment of the present invention, the method for determining the combustion oscillation fault result of the combustion chamber based on the characteristic value of at least one target frequency band may include the following steps:

[0107] Step a: Determine the fault rule table according to the characteristic values ​​of historical fault data;

[0108] Step b: determining a combustion oscillation fault result of the combustion chamber based on a characteristic value of at least one target frequency band and a fault rule table.

[0109] In one embodiment of the present invention, the above fault rule table may include the fault type and the range of the corresponding vibration signal characteristic value and / or pulsating pressure signal characteristic value. Based on this, the combustion oscillation fault result of the combustion chamber can be determined according to the range of the vibration signal characteristic value and / or pulsating pressure signal characteristic value of the target frequency band in the fault rule table.

[0110] In the combustion chamber combustion oscillation online monitoring method proposed by the present invention, the time domain vibration signal and the pulsating pressure signal of the combustion chamber during the operation of the combustion engine are obtained through the vibration acceleration sensor and the pulsating pressure sensor of the combustion chamber; the time domain vibration signal and the pulsating pressure signal are subjected to fast Fourier transform to obtain the frequency domain vibration signal and the frequency domain pulsating pressure signal; the frequency domain vibration signal and the frequency domain pulsating pressure signal are subjected to frequency segmentation to determine at least one target frequency band; the characteristic value of the target frequency band is determined based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band; the combustion oscillation fault result of the combustion chamber is determined based on the characteristic value of at least one target frequency band. Therefore, the present invention monitors the combustion oscillation through the vibration signal and the pulsating pressure signal of the combustion chamber of the gas turbine, and can still monitor the combustion oscillation of the combustion chamber when the pulsating pressure sensor fails, thereby improving the monitoring rate of the combustion oscillation and having a wider monitoring range. It can not only monitor the combustion oscillation, but also monitor the mechanical vibration and fatigue damage of the combustion chamber components, so that it can timely and accurately judge whether the combustion oscillation occurs, and provide support for the accurate and reliable combustion mode adjustment and combustion engine protection of the gas turbine, thereby improving the service life of the combustion chamber.

[0111] In order to implement the above embodiment, Figure 3 As shown, this embodiment also provides a combustion chamber combustion oscillation online monitoring device 10, which includes an acquisition module 301, a data processing module 302, a frequency segmentation module 303, a first determination module 304 and a second determination module 305;

[0112] The acquisition module 301 is used to acquire the time domain vibration signal and the pulsating pressure signal of the combustion chamber during the operation of the combustion engine through the vibration acceleration sensor and the pulsating pressure sensor of the combustion chamber;

[0113] The data processing module 302 is used to perform fast Fourier transform on the time domain vibration signal and the pulsating pressure signal to obtain the frequency domain vibration signal and the frequency domain pulsating pressure signal;

[0114] A frequency segmentation module 303, configured to perform frequency segmentation based on the frequency domain vibration signal and the frequency domain pulsating pressure signal to determine at least one target frequency band;

[0115] A first determination module 304 is used to determine a characteristic value of a target frequency band based on a frequency domain vibration signal and a frequency domain pulsating pressure signal of the target frequency band;

[0116] The second determination module 305 is used to determine a combustion oscillation fault result of the combustion chamber based on a characteristic value of at least one target frequency band.

[0117] In one embodiment of the present invention, the acquisition module 301 is specifically used for:

[0118] Obtaining a vibration acceleration signal through at least one vibration acceleration sensor within a first threshold range of the combustion chamber;

[0119] Obtaining a raw pulsating pressure signal through at least one pulsating pressure sensor within a second threshold range of the combustion chamber;

[0120] The vibration acceleration signal and the original pulsating pressure signal are converted and filtered to obtain the time domain vibration signal and pulsating pressure signal of the combustion chamber during the operation of the gas turbine.

[0121] Further, in one embodiment of the present invention, the characteristic value includes a vibration signal characteristic value and a pulsating pressure signal characteristic value; the first determination module 304 is specifically used to:

[0122] Based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band, determining the maximum value of the frequency domain vibration signal and the maximum value of the frequency domain pulsating pressure signal of the target frequency band;

[0123] The maximum value of the frequency domain vibration signal and the maximum value of the frequency domain pulsating pressure signal in the target frequency band are determined as the characteristic value of the vibration signal and the characteristic value of the pulsating pressure signal in the target frequency band.

[0124] Further, in one embodiment of the present invention, the second determining module 305 is specifically configured to:

[0125] Determine the alarm threshold and the trip threshold of each target frequency band, wherein the alarm threshold includes the vibration signal alarm threshold and the pulsating pressure signal alarm threshold, and the trip threshold includes the vibration signal trip threshold and the pulsating pressure signal trip threshold;

[0126] Based on the alarm threshold and trip threshold of each target frequency band, determine the alarm condition and trip condition of the combustion chamber;

[0127] If the characteristic value within the target frequency band meets the corresponding alarm condition, the combustion chamber combustion oscillation alarm is triggered;

[0128] If the characteristic value in the target frequency band meets the corresponding tripping condition, the combustion oscillation tripping protection action is triggered;

[0129] If the characteristic value in the target frequency band does not meet the alarm condition and the trip condition, the output is no combustion chamber combustion oscillation.

[0130] Furthermore, in one embodiment of the present invention, the second determining module 305 is further configured to:

[0131] Based on the alarm threshold and trip threshold of each target frequency band, determine the quantity thresholds corresponding to the alarm conditions and trip conditions of the combustion chamber;

[0132] Based on the quantity thresholds corresponding to the alarm conditions and the trip conditions of the combustion chamber, the alarm conditions and the trip conditions of the combustion chamber are determined.

[0133] Further, in one embodiment of the present invention, the second determining module 305 is specifically configured to:

[0134] Determine the fault rule table based on the characteristic values ​​of historical fault data;

[0135] Based on the characteristic value of at least one target frequency band and the fault rule table, a combustion oscillation fault result of the combustion chamber is determined.

[0136] In the combustion chamber combustion oscillation online monitoring device proposed by the present invention, the time domain vibration signal and the pulsating pressure signal of the combustion chamber during the operation of the combustion engine are obtained through the vibration acceleration sensor and the pulsating pressure sensor of the combustion chamber; the time domain vibration signal and the pulsating pressure signal are subjected to fast Fourier transformation to obtain the frequency domain vibration signal and the frequency domain pulsating pressure signal; the frequency domain vibration signal and the frequency domain pulsating pressure signal are subjected to frequency segmentation to determine at least one target frequency band; the characteristic value of the target frequency band is determined based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band; the combustion oscillation fault result of the combustion chamber is determined based on the characteristic value of at least one target frequency band. Therefore, the present invention monitors the combustion oscillation through the vibration signal and the pulsating pressure signal of the combustion chamber of the gas turbine, and can still monitor the combustion oscillation of the combustion chamber when the pulsating pressure sensor fails, thereby improving the monitoring rate of the combustion oscillation and having a wider monitoring range. It can not only monitor the combustion oscillation, but also monitor the mechanical vibration and fatigue damage of the combustion chamber components, so that it can timely and accurately judge whether the combustion oscillation occurs, and provide support for the accurate and reliable combustion mode adjustment and combustion engine protection of the gas turbine, thereby improving the service life of the combustion chamber.

[0137] like Figure 4 As shown, the electronic device 400 includes a computing unit 401, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 402 or a computer program loaded from a storage unit 408 into a random access memory (RAM) 403. In the RAM 403, various programs and data required for the operation of the electronic device 400 can also be stored. The computing unit 401, the ROM 402, and the RAM 403 are connected to each other via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0138] A number of components in the electronic device 400 are connected to the I / O interface 405, including: an input unit 408, such as a keyboard, a mouse, etc.; an output unit 407, such as various types of displays, speakers, etc.; a storage unit 408, such as a disk, an optical disk, etc.; and a communication unit 409, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 409 allows the electronic device 400 to exchange information / data with other electronic devices through a computer network such as the Internet and / or various telecommunication networks.

[0139] The computing unit 401 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 401 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 401 performs the various methods and processes described above, such as a combustion chamber combustion oscillation online monitoring method. For example, in some embodiments, the combustion chamber combustion oscillation online monitoring method may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 408. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 400 via the ROM 402 and / or the communication unit 409. When the computer program is loaded into the RAM 403 and executed by the computing unit 401, one or more steps of the combustion chamber combustion oscillation online monitoring method described above may be performed. Alternatively, in other embodiments, the computing unit 401 may be configured to execute the combustion chamber combustion oscillation online monitoring method in any other appropriate manner (for example, by means of firmware).

[0140] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations may include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input system, and at least one output system, and transmit data and instructions to the storage system, the at least one input system, and the at least one output system.

[0141] The program code for implementing the method of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing system, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code may be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.

[0142] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, system, or electronic device. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, system, or electronic device, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage electronic device, a magnetic storage electronic device, or any suitable combination of the foregoing.

[0143] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display system (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing system (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of systems can also be used to provide interaction with a user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0144] The systems and techniques described herein can be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), the Internet, and a blockchain network.

[0145] A computer system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The relationship between the client and the server is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services ("Virtual Private Server", or "VPS" for short). The server may also be a server of a distributed system, or a server combined with a blockchain.

[0146] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0147] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method for online monitoring of combustion chamber combustion oscillation, characterized in that: The method comprises: The time domain vibration signal and pulsation pressure signal of the combustion chamber during the operation of the gas turbine are obtained through the vibration acceleration sensor and pulsation pressure sensor of the combustion chamber; Performing fast Fourier transform on the time-domain vibration signal and the pulsating pressure signal to obtain a frequency-domain vibration signal and a frequency-domain pulsating pressure signal; Perform frequency segmentation based on the frequency domain vibration signal and the frequency domain pulsating pressure signal to determine at least one target frequency band; Determining a characteristic value of the target frequency band based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band; Based on the characteristic value of the at least one target frequency band, a combustion oscillation fault result of the combustion chamber is determined.

2. The method according to claim 1, characterized in that The method of obtaining the time domain vibration signal and the pulsating pressure signal of the combustion chamber during the operation of the combustion engine by using the vibration acceleration sensor and the pulsating pressure sensor of the combustion chamber includes: Obtaining a vibration acceleration signal through at least one vibration acceleration sensor within a first threshold range of the combustion chamber; Obtaining a raw pulsating pressure signal through at least one pulsating pressure sensor within a second threshold range of the combustion chamber; The vibration acceleration signal and the original pulsating pressure signal are subjected to signal conversion and filtering processing to obtain a time domain vibration signal and a pulsating pressure signal of the combustion chamber during the operation of the combustion engine.

3. The method according to claim 1, characterized in that The characteristic value includes a vibration signal characteristic value and a pulsating pressure signal characteristic value; the determining the characteristic value of the target frequency band based on the frequency domain vibration signal and the frequency domain pulsating pressure signal of the target frequency band includes: Determine the maximum value of the frequency domain vibration signal and the maximum value of the frequency domain pulsating pressure signal in the target frequency band based on the frequency domain vibration signal and the frequency domain pulsating pressure signal in the target frequency band; The maximum value of the frequency domain vibration signal and the maximum value of the frequency domain pulsating pressure signal in the target frequency band are determined as the characteristic value of the vibration signal and the characteristic value of the pulsating pressure signal in the target frequency band.

4. The method according to claim 1, characterized in that: The determining, based on the characteristic value of the at least one target frequency band, a combustion oscillation fault result of the combustion chamber, comprises: Determine the alarm threshold and the trip threshold of each target frequency band, wherein the alarm threshold includes the vibration signal alarm threshold and the pulsating pressure signal alarm threshold, and the trip threshold includes the vibration signal trip threshold and the pulsating pressure signal trip threshold; Determining the alarm condition and the trip condition of the combustion chamber based on the alarm threshold and the trip threshold of each target frequency band; If the characteristic value within the target frequency band meets the corresponding alarm condition, a combustion chamber combustion oscillation alarm is triggered; If the characteristic value in the target frequency band meets the corresponding tripping condition, the combustion oscillation tripping protection action is triggered; If the characteristic value in the target frequency band does not meet the alarm condition and the trip condition, the output is no combustion chamber combustion oscillation.

5. The method according to claim 1, characterized in that The step of determining the alarm condition and the trip condition of the combustion chamber based on the alarm threshold and the trip threshold of each target frequency band includes: Determining the quantity thresholds corresponding to the alarm conditions and the trip conditions of the combustion chamber based on the alarm thresholds and the trip thresholds of the target frequency bands; Based on the quantity thresholds corresponding to the alarm condition and the trip condition of the combustion chamber, the alarm condition and the trip condition of the combustion chamber are determined.

6. The method according to claim 1, characterized in that The determining of the combustion oscillation fault result of the combustion chamber based on the characteristic value of the at least one target frequency band includes: Determine the fault rule table based on the characteristic values ​​of historical fault data; Based on the characteristic value of the at least one target frequency band and the fault rule table, a combustion oscillation fault result of the combustion chamber is determined.

7. An on-line monitoring device for combustion chamber combustion oscillation, characterized in that: The device comprises: An acquisition module is used to acquire a time domain vibration signal and a pulsating pressure signal of the combustion chamber during the operation of the combustion engine through a vibration acceleration sensor and a pulsating pressure sensor of the combustion chamber; A data processing module, used for performing fast Fourier transform on the time-domain vibration signal and the pulsating pressure signal to obtain a frequency-domain vibration signal and a frequency-domain pulsating pressure signal; A frequency segmentation module, used to perform frequency segmentation based on the frequency domain vibration signal and the frequency domain pulsating pressure signal to determine at least one target frequency band; A first determination module, configured to determine a characteristic value of the target frequency band based on a frequency domain vibration signal and a frequency domain pulsating pressure signal of the target frequency band; The second determination module is used to determine the combustion oscillation fault result of the combustion chamber based on the characteristic value of the at least one target frequency band.

8. The device according to claim 7, characterized in that The acquisition module is specifically used for: Obtaining a vibration acceleration signal through at least one vibration acceleration sensor within a first threshold range of the combustion chamber; Obtaining a raw pulsating pressure signal through at least one pulsating pressure sensor within a second threshold range of the combustion chamber; The vibration acceleration signal and the original pulsating pressure signal are subjected to signal conversion and filtering processing to obtain a time domain vibration signal and a pulsating pressure signal of the combustion chamber during the operation of the combustion engine.

9. An electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 6.

10. A computer storage medium, wherein: The computer storage medium stores computer executable instructions; after the computer executable instructions are executed by the processor, the method according to any one of claims 1 to 6 can be implemented.

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