CN114485957A - Method and device for analyzing ignition stability of pulverized coal burner - Google Patents
Method and device for analyzing ignition stability of pulverized coal burner Download PDFInfo
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Abstract
The application provides a pulverized coal burner ignition stability analysis method and a device thereof, wherein the method comprises the following steps: decomposing a flame radiation spectrum in the pulverized coal burner into three primary colors through a color filter layer, and converting the three primary colors into digital image data in direct proportion to light intensity; analyzing the digital image data to obtain a flame radiation intensity signal, and calculating according to the flame radiation intensity signal through the corresponding relation between the temperature and the image and the Planck's law to obtain flame image temperature data; and obtaining a combustion stability analysis result through binarization processing according to the flame image temperature data. Therefore, the accuracy of stability judgment can be effectively provided by utilizing the color distribution signals of the flame images to judge the flame stability; meanwhile, the process is simpler and the applicability is stronger.
Description
Technical Field
The application relates to the field of safety monitoring, in particular to a method and a device for analyzing ignition stability of a pulverized coal burner.
Background
The flame image temperature processing technology is a two-dimensional temperature measuring system based on image acquisition and image processing, can realize simultaneous online display of flame images and temperature, and is widely applied to coal-fired boilers, gas-fired boilers, industrial furnaces such as steel, chemical engineering, cement and the like. In recent years, with the development of computers and image processing technologies, the flame image resolution and the temperature measurement accuracy are improved, and the flame image temperature is used as a basic condition of ignition stability criterion. In these technologies, image brightness and flicker frequency are mainly used as the main judgment basis, but these methods all have certain limitations, and there is a need in the art for a method and a device for effectively judging flame stability in another way, so as to provide reference and guidance for subsequent operations.
Disclosure of Invention
The application aims to provide a method and a device for analyzing the ignition stability of a pulverized coal burner, which can accurately judge the stability of flame by analyzing the color distribution of a flame image and provide effective technical support for subsequent operation.
To achieve the above object, the present application provides a method for analyzing ignition stability of a pulverized coal burner, comprising: decomposing a flame radiation spectrum in the pulverized coal burner into three primary colors through a color filter layer, and converting the three primary colors into digital image data in direct proportion to light intensity; analyzing the digital image data to obtain a flame radiation intensity signal, and calculating according to the flame radiation intensity signal through the corresponding relation between the temperature and the image and the Planck's law to obtain flame image temperature data; and obtaining a combustion stability analysis result through binarization processing according to the flame image temperature data.
In the method for analyzing ignition stability of a pulverized coal burner, optionally, the method further comprises: flame image data of a plurality of preset temperatures are respectively acquired through photosensitive acquisition equipment, and the corresponding relation between the temperatures and the images is constructed.
In the method for analyzing the ignition stability of the pulverized coal burner, optionally, the constructing a correspondence between the temperature and the image includes: and when the radiation wavelength range of the flame in the flame radiation spectrum is a first threshold value and the temperature range is a second threshold value, constructing the corresponding relation between the temperature and the image through the Wien's law.
In the method for analyzing the ignition stability of the pulverized coal burner, optionally, the obtaining the flame radiation intensity signal according to the digital image data analysis includes: obtaining the flame radiation intensity signal according to the corresponding monochromatic amplitude intensity of the three primary colors in the digital image data; wherein the monochromatic amplitude intensity is obtained by the following formula:
in the above formula, R, G, B are pixel spectral color values of three primary colors in the digital image data, respectively; lambda [ alpha ]1，λ2Is the spectral response range of the image acquisition device; etar，ηg，ηbSpectral sensitivity coefficients for three primary colors in the digital image data; lambda [ alpha ]r，λg，λbSpectral response characteristic wavelengths of three primary colors in the digital image data; k is a radical ofr，kg，kbAnd the three primary colors in the digital image data correspond to the photoelectric conversion coefficients of three channels.
In the method for analyzing the ignition stability of the pulverized coal burner, optionally, the obtaining of the flame image temperature data by calculating the corresponding relationship between the temperature and the image according to the flame radiation intensity signal and the planck's law includes:
flame image temperature data is obtained by calculating the following formula:
in the aboveIn the formula, C2Planck constant, T is flame image temperature.
In the method for analyzing the ignition stability of the pulverized coal burner, optionally, obtaining a combustion stability analysis result by binarization processing according to the flame image temperature data includes: obtaining a temperature matrix through binarization processing according to the temperature of each point on the image in the flame image temperature data; analyzing through a stability calculation model according to the temperature matrix to obtain a combustion stability analysis result;
wherein the stability calculation model comprises:
in the above formula, e is a combustion stability analysis result; ei,jIs a temperature matrix; i and j are respectively the horizontal and vertical coordinates of pixel points on the image in the flame image temperature data; i is the total row number of pixel points on the image in the flame image temperature data; j is the total number of columns of pixel points on the image in the flame image temperature data.
The application also provides a pulverized coal burner ignition stability analysis device, which comprises an image acquisition module, a calculation module and an analysis module; the image acquisition module is used for decomposing a flame radiation spectrum in the pulverized coal burner into three primary colors through a color filter layer and converting the three primary colors into digital image data in direct proportion to light intensity; the calculation module is used for analyzing and obtaining flame radiation intensity signals according to the digital image data and calculating and obtaining flame image temperature data according to the flame radiation intensity signals through the corresponding relation between temperature and images and the Planck's law; the analysis module is used for obtaining a combustion stability analysis result through binarization processing according to the flame image temperature data.
In the device for analyzing the ignition stability of the pulverized coal burner, optionally, the device further includes a calibration module, and the calibration module is configured to respectively acquire flame image data of a plurality of preset temperatures through a photosensitive acquisition device, and construct a corresponding relationship between the temperatures and the images.
In the above pulverized coal burner ignition stability analysis apparatus, optionally, the image acquisition module includes a flame image detector and a conversion unit; the flame image detector collects a flame radiation spectrum in the pulverized coal burner, and the flame radiation spectrum is decomposed into three primary colors through a color filter layer; the conversion unit is used for converting the three primary colors into digital image data which is in direct proportion to light intensity.
In the above pulverized coal burner ignition stability analyzing apparatus, optionally, the flame image detector comprises a color CCD camera.
The application also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the method.
The present application also provides a computer-readable storage medium storing a computer program for executing the above method.
The beneficial technical effect of this application lies in: the accuracy of stability judgment is effectively provided by judging the flame stability by using the color distribution signals of the flame image; meanwhile, the process is simpler and the applicability is stronger.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this application, and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic flow chart illustrating a method for analyzing ignition stability of a pulverized coal burner according to an embodiment of the present application;
FIG. 2 is a schematic view of a process for obtaining combustion stability analysis results according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a pulverized coal burner ignition stability analysis apparatus according to an embodiment of the present application;
FIG. 4 is a schematic view of an installation structure of a flame image temperature detector according to an embodiment of the present application;
FIG. 5 is a schematic diagram of an application structure of a pulverized coal burner ignition stability analysis apparatus according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following detailed description will be provided with reference to the drawings and examples to explain how to apply the technical means to solve the technical problems and to achieve the technical effects. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments in the present application may be combined with each other, and the technical solutions formed are all within the scope of the present application.
Additionally, the steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions and, although a logical order is illustrated in the flow charts, in some cases, the steps illustrated or described may be performed in an order different than here.
Referring to fig. 1, the method for analyzing the ignition stability of the pulverized coal burner provided in the present application specifically includes:
s101, decomposing a flame radiation spectrum in the pulverized coal burner into three primary colors through a color filter layer, and converting the three primary colors into digital image data in direct proportion to light intensity;
s102, flame radiation intensity signals are obtained according to the digital image data, and flame image temperature data are obtained through the corresponding relation between the temperature and the images and the Planck' S law calculation according to the flame radiation intensity signals;
s103, obtaining a combustion stability analysis result through binarization processing according to the flame image temperature data.
In this embodiment, steps S101 and S102 are based on the following principle: the flame radiation spectrum is decomposed into RGB three primary colors by a color filter layer, enters a CCD photosensitive element and is converted into a digital image in direct proportion to the light intensity; thereafter, the flame radiation intensity signal can be obtained from the image RGB values, and then the flame image temperature can be calculated according to Planck's law.
In an embodiment of the present application, the method may further include: flame image data of a plurality of preset temperatures are respectively acquired through photosensitive acquisition equipment, and the corresponding relation between the temperatures and the images is constructed. Specifically, the CCD camera may be calibrated by a black body furnace (or other known temperatures), i.e. the relationship between the temperature signal and the image signal is established, thereby realizing the establishment of the relationship between the temperature and the image RGB value. Wherein, constructing the corresponding relationship between the temperature and the image may include: and when the radiation wavelength range of the flame in the flame radiation spectrum is a first threshold value and the temperature range is a second threshold value, constructing the corresponding relation between the temperature and the image through the Wien's law. In practical work, the Planck's radiation law may be replaced by the Venn's law in the radiation wavelength range of 300nm to 1000nm (first threshold), and the temperature range of 800K to 2000K (second threshold); according to the wien formula, the flame monochromatic radiation intensity is:
Iλ＝ελC1λ-5exp(-C2/λT)/π； (1)
in the above formula,. epsilonλIs monochromatic radiance, a function of wavelength λ; t is temperature, K; λ is the wavelength, m; c1 and C2 are Planck constants, and their values are 3.742 × 10-16W/m respectively2And 1.4388X 10-2m X K; i isλIs the intensity of monochromatic radiation, W/(m)3×sr)。
Based on the above embodiment, the method for solving the temperature distribution by using the ratio of 3 chrominance signals of red, green and blue in the visible light band received by the color CCD is mainly based on the principle that the temperature of any pixel in the radiation image can be calculated by the following formula:
the output of the color CCD is an RGB three-spectrum color channel, and the wave band response of the CCD is simplified into monochromatic response processing, namely, the monochromatic radiation intensity corresponding to the RGB value in the color flame image is assumed to be proportional to the characteristic wavelength of the response spectrum.
Referring to an embodiment of the present application, regarding a calculation method of monochromatic radiation intensity corresponding to RGB values, obtaining a flame radiation intensity signal according to the digital image data analysis may include: obtaining the flame radiation intensity signal according to the corresponding monochromatic amplitude intensity of the three primary colors in the digital image data; wherein the monochromatic amplitude intensity is obtained by the following formula:
in the above formula, R, G, B are pixel spectral color values of three primary colors in the digital image data, respectively; lambda [ alpha ]1，λ2Is the spectral response range, lambda, of the image acquisition device1＝380nm，λ2＝780nm；ηr，ηg，ηbSpectral sensitivity coefficients for three primary colors in the digital image data; lambda [ alpha ]r，λg，λbCharacteristic wavelength, lambda, of spectral response of three primary colors in the digital image datar＝610nm，λg＝510nm，λb＝460nm；kr，kg，kbThe photoelectric conversion coefficients of three channels corresponding to the three primary colors in the digital image data are key parameters in the radiation temperature measurement process, are controlled by factors such as a camera shutter, an aperture, white balance, gain, noise and the like, and are usually obtained by calibration of a black body furnace.
Based on the above flow, in an embodiment of the present application, the obtaining flame image temperature data through the corresponding relationship between temperature and image and planck's law calculation according to the flame radiation intensity signal may include:
flame image temperature data is obtained by calculating the following formula:
in the above formula, C2Planck constant, T is flame image temperature.
Specifically, please refer to fig. 2, in an embodiment of the present application, obtaining a combustion stability analysis result by binarization processing according to the flame image temperature data includes:
s201, obtaining a temperature matrix through binarization processing according to the temperature of each point on the image in the flame image temperature data;
s202, analyzing through a stability calculation model according to the temperature matrix to obtain a combustion stability analysis result;
wherein the stability calculation model comprises:
in the above formula, e is a combustion stability analysis result; ei,jIs a temperature matrix; i and j are respectively the horizontal and vertical coordinates of pixel points on the image in the flame image temperature data; i is the total row number of pixel points on the image in the flame image temperature data; j is the total number of columns of pixel points on the image in the flame image temperature data.
Referring to fig. 3, the present application further provides a pulverized coal burner ignition stability analysis apparatus, which includes an image acquisition module, a calculation module and an analysis module; the image acquisition module is used for decomposing a flame radiation spectrum in the pulverized coal burner into three primary colors through a color filter layer and converting the three primary colors into digital image data in direct proportion to light intensity; the calculation module is used for analyzing and obtaining flame radiation intensity signals according to the digital image data and calculating and obtaining flame image temperature data according to the flame radiation intensity signals through the corresponding relation between temperature and images and the Planck's law; the analysis module is used for obtaining a combustion stability analysis result through binarization processing according to the flame image temperature data. The device also comprises a calibration module, wherein the calibration module is used for respectively acquiring flame image data of a plurality of preset temperatures through photosensitive acquisition equipment and constructing a corresponding relation between the temperatures and the images.
In the above embodiment, the image acquisition module includes a flame image detector and a conversion unit; the flame image detector collects a flame radiation spectrum in the pulverized coal burner, and the flame radiation spectrum is decomposed into three primary colors through a color filter layer; the conversion unit is used for converting the three primary colors into digital image data which is in direct proportion to light intensity. The installation mode of the flame image detectors can refer to fig. 4, each flame image temperature detector 401 and the jet orifice of the combustor 402 form an included angle, the included angle degree can be selected and set according to actual needs, and the application does not further limit the included angle degree. In practical use, the flame image detector can be a color CCD camera, the calculation module and the analysis module can be integrated into a flame image processing server, and a simulated flame image monitor can be arranged to monitor the image acquisition state in real time; in the process of judging the stability, as shown in fig. 5, firstly, the firing image of each burner is introduced into the simulated flame monitor 501 in real time, and simultaneously, the image information is introduced into the flame image processing server 502, and the regional temperature distribution of the pulverized coal burner is calculated in real time; and judging the ignition stability of the burner according to the temperature area ratio in the flame detector image. The stability is between 0 and 1. The specific algorithm is as follows: traversing the flame image detector to obtain the temperature T of each point on the imagei,jCarrying out binarization operation on the coarse coal particles to obtain E, wherein the lean coal threshold is 650 ℃, the bituminous coal threshold is 500 ℃, and the lignite threshold is 400 DEGi,j，Ei,jIs a matrix consisting of only 0, 1, and the combustion stability index is calculated as:
in the above formula, I is the total number of rows of image pixel points; j is the total number of rows of image pixels.
And finally, sending the judgment result of the combustion stability to a subsequent terminal through an industrial control ethernet 503.
The beneficial technical effect of this application lies in: the accuracy of stability judgment is effectively provided by utilizing the color distribution signals of the flame images to judge the flame stability; meanwhile, the process is simpler and the applicability is stronger.
The application also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the method.
The present application also provides a computer-readable storage medium storing a computer program for executing the above method.
As shown in fig. 6, the electronic device 600 may further include: a communication module 110, an input unit 120, a display 160, and a power supply 170. It is noted that the electronic device 600 does not necessarily include all of the components shown in FIG. 6; furthermore, the electronic device 600 may also comprise components not shown in fig. 6, which may be referred to in the prior art.
As shown in fig. 6, the central processor 100, sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device, the central processor 100 receiving input and controlling the operation of the various components of the electronic device 600.
The memory 140 may be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information relating to the failure may be stored, and a program for executing the information may be stored. And the central processing unit 100 may execute the program stored in the memory 140 to realize information storage or processing, etc.
The input unit 120 provides input to the cpu 100. The input unit 120 is, for example, a key or a touch input device. The power supply 170 is used to provide power to the electronic device 600. The display 160 is used for displaying display objects such as images and characters. The display may be, for example, an LCD display, but is not limited thereto.
The memory 140 may be a solid state memory such as Read Only Memory (ROM), Random Access Memory (RAM), a SIM card, or the like. There may also be a memory that holds information even when power is off, can be selectively erased, and is provided with more data, an example of which is sometimes called an EPROM or the like. The memory 140 may also be some other type of device. Memory 140 includes buffer memory 141 (sometimes referred to as a buffer). The memory 140 may include an application/function storage section 142, and the application/function storage section 142 is used to store application programs and function programs or a flow for executing the operation of the electronic device 600 by the central processing unit 100.
The memory 140 may also include a data store 143, the data store 143 for storing data, such as contacts, digital data, pictures, sounds, and/or any other data used by the electronic device. The driver storage portion 144 of the memory 140 may include various drivers of the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging application, address book application, etc.).
The communication module 110 is a transmitter/receiver 110 that transmits and receives signals via an antenna 111. The communication module (transmitter/receiver) 110 is coupled to the central processor 100 to provide an input signal and receive an output signal, which may be the same as in the case of a conventional mobile communication terminal.
Based on different communication technologies, a plurality of communication modules 110, such as a cellular network module, a bluetooth module, and/or a wireless local area network module, may be provided in the same electronic device.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are further described in detail for the purpose of illustrating the invention, and it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (12)
1. A method for analyzing ignition stability of a pulverized coal burner, the method comprising:
decomposing a flame radiation spectrum in the pulverized coal burner into three primary colors through a color filter layer, and converting the three primary colors into digital image data in direct proportion to light intensity;
analyzing the digital image data to obtain a flame radiation intensity signal, and calculating according to the flame radiation intensity signal through the corresponding relation between the temperature and the image and the Planck's law to obtain flame image temperature data;
and obtaining a combustion stability analysis result through binarization processing according to the flame image temperature data.
2. The pulverized coal burner ignition stability analysis method as claimed in claim 1, further comprising:
flame image data of a plurality of preset temperatures are respectively acquired through photosensitive acquisition equipment, and the corresponding relation between the temperatures and the images is constructed.
3. The pulverized coal burner ignition stability analysis method as claimed in claim 2, wherein the constructing of the correspondence between the temperature and the image comprises:
and when the radiation wavelength range of the flame in the flame radiation spectrum is a first threshold value and the temperature range is a second threshold value, constructing the corresponding relation between the temperature and the image through the Wien's law.
4. The pulverized coal burner ignition stability analysis method of claim 1, wherein obtaining the flame radiation intensity signal from the digital image data analysis comprises:
obtaining the flame radiation intensity signal according to the corresponding monochromatic amplitude intensity of the three primary colors in the digital image data;
wherein the monochromatic amplitude intensity is obtained by the following formula:
in the above formula, R, G, B are pixel spectral color values of three primary colors in the digital image data, respectively; lambda [ alpha ]1，λ2Is the spectral response range of the image acquisition device; etar，ηg，ηbSpectral sensitivity coefficients for three primary colors in the digital image data; lambda [ alpha ]r，λg，λbSpectral response characteristic wavelengths for three primary colors in the digital image data; k is a radical ofr，kg，kbAnd the three primary colors in the digital image data correspond to the photoelectric conversion coefficients of three channels.
5. The pulverized coal burner ignition stability analysis method as claimed in claim 4, wherein the obtaining of flame image temperature data by the corresponding relationship between temperature and image and planck's law calculation from the flame radiation intensity signal comprises:
flame image temperature data is obtained by calculating the following formula:
in the above formula, C2Planck constant, T is flame image temperature.
6. The pulverized coal burner ignition stability analysis method according to claim 1, wherein obtaining a combustion stability analysis result by binarization processing based on the flame image temperature data comprises:
obtaining a temperature matrix through binarization processing according to the temperature of each point on the image in the flame image temperature data;
analyzing through a stability calculation model according to the temperature matrix to obtain a combustion stability analysis result;
wherein the stability calculation model comprises:
in the above formula, e is a combustion stability analysis result; ei，jIs a temperature matrix; i and j are respectively the horizontal and vertical coordinates of pixel points on the image in the flame image temperature data; i is the total row number of pixel points on the image in the flame image temperature data; j is the total number of columns of pixel points on the image in the flame image temperature data.
7. The ignition stability analysis device of the pulverized coal burner is characterized by comprising an image acquisition module, a calculation module and an analysis module;
the image acquisition module is used for decomposing a flame radiation spectrum in the pulverized coal burner into three primary colors through a color filter layer and converting the three primary colors into digital image data in direct proportion to light intensity;
the calculation module is used for analyzing and obtaining flame radiation intensity signals according to the digital image data and calculating and obtaining flame image temperature data according to the flame radiation intensity signals through the corresponding relation between temperature and images and the Planck's law;
the analysis module is used for obtaining a combustion stability analysis result through binarization processing according to the flame image temperature data.
8. The pulverized coal burner ignition stability analysis device as claimed in claim 7, further comprising a calibration module, wherein the calibration module is used for respectively acquiring flame image data of a plurality of preset temperatures through a photosensitive acquisition device, and constructing the corresponding relationship between the temperatures and the images.
9. The pulverized coal burner ignition stability analysis device as claimed in claim 7, wherein the image acquisition module comprises a flame image detector and a conversion unit;
the flame image detector collects a flame radiation spectrum in the pulverized coal burner, and the flame radiation spectrum is decomposed into three primary colors through a color filter layer;
the conversion unit is used for converting the three primary colors into digital image data which is in direct proportion to light intensity.
10. The pulverized coal burner ignition stability analyzing apparatus as claimed in claim 9, wherein the flame image detector includes a color CCD camera.
11. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any of claims 1 to 6 when executing the computer program.
12. A computer-readable storage medium, characterized in that it stores a computer program for executing the method of any one of claims 1 to 6 by a computer.
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