CN114485957B - 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 method and a device for analyzing the ignition stability of a pulverized coal burner, wherein the method comprises the following steps: after the flame radiation spectrum in the pulverized coal burner is decomposed into three primary colors through a color filter layer, the three primary colors are converted into digital image data in direct proportion to the light intensity; analyzing and obtaining flame radiation intensity signals according to the digital image data, and calculating and obtaining flame image temperature data according to the corresponding relation between the flame radiation intensity signals and the image and the Planckian law; and obtaining a combustion stability analysis result through binarization processing according to the flame image temperature data. Therefore, judging flame stability by utilizing the color distribution signal of the flame image effectively provides accuracy of judging the stability; meanwhile, the flow 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 the ignition stability of a pulverized coal burner.
Background
The flame image temperature processing technology is a two-dimensional temperature measurement system based on image acquisition and image processing, can realize simultaneous online display of flame images and temperatures, and is widely applied to coal-fired boilers, gas-fired boilers, and industrial furnaces of steel, chemical industry, cement and the like. In recent years, with the continuous development of computer and image processing technology, the resolution of flame images and the accuracy of temperature measurement are also improved, and the flame image temperature is used as a basic condition of a fire stability criterion. In these technologies, image brightness and flicker frequency are mainly adopted as main judgment basis, but these modes have certain limitations, and there is a need in the art for a method and a device for effectively judging flame stability by other ways, 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 accurately judge the flame stability by analyzing the color distribution of a flame image and provide effective technical support for subsequent operation.
In order to achieve the above purpose, the method for analyzing the ignition stability of the pulverized coal burner provided by the application specifically comprises the following steps: after the flame radiation spectrum in the pulverized coal burner is decomposed into three primary colors through a color filter layer, the three primary colors are converted into digital image data in direct proportion to the light intensity; analyzing and obtaining flame radiation intensity signals according to the digital image data, and calculating and obtaining flame image temperature data according to the corresponding relation between the flame radiation intensity signals and the image and the Planckian law; and obtaining a combustion stability analysis result through binarization processing according to the flame image temperature data.
In the above method for analyzing ignition stability of a pulverized coal burner, optionally, the method further comprises: and 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 method for analyzing ignition stability of a pulverized coal burner, optionally, the correspondence between the construction temperature and the image includes: 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, the corresponding relation between the temperature and the image is constructed through Venn law.
In the above method for analyzing the ignition stability of a pulverized coal burner, optionally, obtaining a flame radiation intensity signal according to the digital image data analysis includes: obtaining the flame radiation intensity signal according to the corresponding monochromatic amplitude intensities of the three primary colors in the digital image data; wherein the monochrome amplitude intensity is obtained by the following formula:
In the above formula, R, G, and B are respectively pixel spectrum color values of three primary colors in the digital image data; lambda 1,λ2 is the spectral response range of the image acquisition device; η r,ηg,ηb is the spectral sensitivity coefficient of the three primary colors in the digital image data; lambda r,λg,λb is the spectral response characteristic wavelength of the three primary colors in the digital image data; k r,kg,kb is the photoelectric conversion coefficient of the three channels corresponding to the three primary colors in the digital image data.
In the above method for analyzing the ignition stability of a pulverized coal burner, optionally, calculating the flame image temperature data according to the corresponding relationship between the flame radiation intensity signal and the image and the planck law includes:
Flame image temperature data was obtained by calculation using the following formula:
in the above formula, C 2 is the Planckian constant, and T is the flame image temperature.
In the above method for analyzing the ignition stability of a pulverized coal burner, optionally, obtaining the combustion stability analysis result by binarization processing according to the flame image temperature data includes: according to the temperature of each point on the image in the flame image temperature data, obtaining a temperature matrix through binarization processing; obtaining a combustion stability analysis result through stability calculation model analysis according to the temperature matrix;
wherein the stability calculation model comprises:
in the above formula, e is the combustion stability analysis result; e i,j is a temperature matrix; i, j are respectively the abscissa and ordinate of the pixel point on the image in the flame image temperature data; i is the total line number of pixel points on the image in the flame image temperature data; j is the total number of columns of pixels on the image in the flame image temperature data.
The application also provides a device for analyzing the ignition stability of the pulverized coal burner, which comprises an image acquisition module, a calculation module and an analysis module; the image acquisition module is used for decomposing flame radiation spectrum in the pulverized coal burner into three primary colors through the color filtering layer and then 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 corresponding relation between the flame radiation intensity signals and the image and the Planck 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 above-mentioned pulverized coal burner ignition stability analysis device, optionally, the device further comprises 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 a corresponding relationship between the temperatures and the images.
In the above-mentioned pulverized coal burner fire stability analysis device, optionally, the image acquisition module includes a flame image detector and a conversion unit; the flame image detector collects flame radiation spectrum in the pulverized coal burner and decomposes the flame radiation spectrum into three primary colors through the color filtering layer; the conversion unit is used for converting the three primary colors into digital image data which is proportional to the light intensity.
In the above-mentioned pulverized coal burner fire stability analysis device, optionally, the flame image detector includes a color CCD camera.
The application also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the above method when executing the computer program.
The present application also provides a computer readable storage medium storing a computer program for executing the above method.
The beneficial technical effects of the application are as follows: judging flame stability by utilizing the color distribution signal of the flame image effectively provides accuracy of judging the stability; meanwhile, the flow is simpler and the applicability is stronger.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic flow chart of a method for analyzing the ignition stability of a pulverized coal burner according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a flow chart for obtaining a combustion stability analysis result according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a device for analyzing the ignition stability of a pulverized coal burner according to an embodiment of the present application;
FIG. 4 is a schematic diagram 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 fire stability analysis device 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 application.
Detailed Description
The following will describe embodiments of the present application in detail with reference to the drawings and examples, thereby solving the technical problems by applying technical means to the present application, and realizing the technical effects can be fully understood and implemented accordingly. It should be noted that, as long as no conflict is formed, each embodiment of the present application and each feature of each embodiment may be combined with each other, and the formed technical solutions are all within the protection scope of the present application.
Additionally, the steps illustrated in the flowcharts 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 flowcharts, in some cases the steps illustrated or described may be performed in an order other than that herein.
Referring to fig. 1, the method for analyzing the ignition stability of a pulverized coal burner provided by the present application specifically includes:
S101, decomposing 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, analyzing and obtaining flame radiation intensity signals according to the digital image data, and calculating and obtaining flame image temperature data according to the corresponding relation between the flame radiation intensity signals and the image and the Planck law;
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 principle that: the flame radiation spectrum is decomposed into RGB three primary colors through a color filter layer and then enters a CCD photosensitive element to be converted into a digital image in direct proportion to the light intensity; thereafter, a flame radiation intensity signal may be derived from the image RGB values, and then the flame image temperature may be calculated according to Planck's Law.
In an embodiment of the present application, the method may further comprise: and 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. Specifically, the CCD camera can be calibrated through a blackbody furnace (or other known temperature), namely, the relation between the temperature signal and the image signal is established, so that the relation between the temperature and the RGB value of the image is established. Wherein, the correspondence between the build temperature and the image may include: 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, the corresponding relation between the temperature and the image is constructed through Venn law. In actual work, the Planck's radiation law can be replaced by Venn's law in the radiation wavelength range of 300-1000 nm (first threshold) and the temperature range of 800-2000K (second threshold); according to the wien equation, the flame monochromatic radiation intensity is:
Iλ＝ελC1λ-5exp(-C2/λT)/π； (1)
In the above formula, ε λ is the monochromatic emissivity, which is a function of wavelength λ; t is the temperature, K; lambda is the wavelength, m; c1 and C2 are Planck constants, and the values are 3.742 X10-16W/m 2 and 1.4388X 10-2m K respectively; i λ is the intensity of monochromatic radiation, W/(m 3 ×sr).
Based on the above embodiment, the method of solving the temperature distribution based on the ratio between the 3 chrominance signals of red, green and blue in the visible light band received by the color CCD is adopted, and the main principle is that the temperature of any pixel in the radiation image can be calculated by the following formula:
The color CCD outputs as RGB trichromatic color channels, and the band response of CCD is simplified into monochromatic response processing, i.e. the intensity of monochromatic radiation corresponding to RGB values in the color flame image is assumed to be proportional to the characteristic wavelength of the response spectrum.
For calculation of the monochromatic radiation intensity corresponding to the RGB values, referring to an embodiment of the application, the obtaining the 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 intensities of the three primary colors in the digital image data; wherein the monochrome amplitude intensity is obtained by the following formula:
In the above formula, R, G, and B are respectively pixel spectrum color values of three primary colors in the digital image data; lambda 1,λ2 is the spectral response range of the image acquisition device, lambda 1＝380nm,λ2＝780nm;ηr,ηg,ηb is the spectral sensitivity coefficient of the three primary colors in the digital image data; lambda r,λg,λb is the spectral response characteristic wavelength of the three primary colors in the digital image data, lambda r＝610nm,λg＝510nm,λb＝460nm;kr,kg,kb is the photoelectric conversion coefficient of the three channels corresponding to the three primary colors in the digital image data, and is a key parameter in the radiation temperature measurement process, and the parameters are controlled by factors such as a camera shutter, an aperture, white balance, gain, noise and the like, and are usually calibrated by a blackbody furnace.
Based on the above flow, in an embodiment of the present application, obtaining flame image temperature data according to the flame radiation intensity signal through the corresponding relationship between temperature and image and planck's law calculation may include:
Flame image temperature data was obtained by calculation using the following formula:
in the above formula, C 2 is the Planckian constant, and T is the flame image temperature.
The method for obtaining the temperature of each point on each frame of image in the flame image temperature data and comprehensively analyzing the combustion stability based on the temperature values of each point in the image can be provided, and specifically, referring to fig. 2, in one embodiment of the present application, obtaining the combustion stability analysis result through binarization processing according to the flame image temperature data includes:
s201, according to the temperature of each point on the image in the flame image temperature data, obtaining a temperature matrix through binarization processing;
s202, analyzing and obtaining a combustion stability analysis result through a stability calculation model according to the temperature matrix;
wherein the stability calculation model comprises:
in the above formula, e is the combustion stability analysis result; e i,j is a temperature matrix; i, j are respectively the abscissa and ordinate of the pixel point on the image in the flame image temperature data; i is the total line number of pixel points on the image in the flame image temperature data; j is the total number of columns of pixels on the image in the flame image temperature data.
Referring to fig. 3, the application further provides a device for analyzing the ignition stability of the pulverized coal burner, wherein the device comprises an image acquisition module, a calculation module and an analysis module; the image acquisition module is used for decomposing flame radiation spectrum in the pulverized coal burner into three primary colors through the color filtering layer and then 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 corresponding relation between the flame radiation intensity signals and the image and the Planck 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 can further comprise 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 flame radiation spectrum in the pulverized coal burner and decomposes the flame radiation spectrum into three primary colors through the color filtering layer; the conversion unit is used for converting the three primary colors into digital image data which is proportional to the light intensity. The installation mode of the flame image detectors can be shown in fig. 4, each flame image temperature detector 401 and the injection port of the burner 402 form an included angle, the degree of the included angle can be selected and set according to actual needs, and the application is not limited in this way. In actual use, the flame image detector may be a color CCD camera, the calculation module and the analysis module may be integrated into a flame image processing server, and an analog flame image monitor may be further provided to monitor the image acquisition state in real time; in the process of judging stability, as shown in fig. 5, firstly, each burner ignition image is introduced into a simulated flame monitor 501 in real time, and meanwhile, image information is introduced into a flame image processing server 502, so as to calculate the temperature distribution of a pulverized coal burner area 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 temperature T i,j of each point on the image obtained by the flame image detector, performing binarization operation on the temperature T i,j, wherein the lean coal threshold is 650 ℃, the bituminous coal threshold is 500 ℃, the lignite threshold is 400 ℃, obtaining a matrix with E i,j,Ei,j being only 0 and 1, and calculating the combustion stability index as follows:
In the above formula, I is the total number of rows of the image pixel points; j is the total number of columns of the image pixels.
Finally, the judgment result of the combustion stability is sent to the subsequent terminal through the industrial control Ethernet 503.
The beneficial technical effects of the application are as follows: judging flame stability by utilizing the color distribution signal of the flame image effectively provides accuracy of judging the stability; meanwhile, the flow is simpler and the applicability is stronger.
The application also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the above method when executing the computer program.
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, a power supply 170. It is noted that the electronic device 600 need not include all of the components shown in fig. 6; in addition, the electronic device 600 may further include components not shown in fig. 6, to which reference is made to the prior art.
As shown in fig. 6, the central processor 100, also sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device, which central processor 100 receives inputs and controls 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 about failure may be stored, and a program for executing the information may be stored. And the central processor 100 can execute the program stored in the memory 140 to realize information storage or processing, etc.
The input unit 120 provides an input to the central processor 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, but not limited to, an LCD display.
The memory 140 may be a solid state memory such as Read Only Memory (ROM), random Access Memory (RAM), SIM card, or the like. But also a memory which holds information even when powered down, can be selectively erased and provided with further data, an example of which is sometimes referred to as EPROM or the like. Memory 140 may also be some other type of device. Memory 140 includes a buffer memory 141 (sometimes referred to as a buffer). The memory 140 may include an application/function storage 142, the application/function storage 142 for storing application programs and function programs or a flow for executing operations of the electronic device 600 by the central processor 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 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 applications, address book applications, etc.).
The communication module 110 is a transmitter/receiver 110 that transmits and receives signals via an antenna 111. A 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, etc., may be provided in the same electronic device.
It will be appreciated by those skilled in the art that 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 the like) 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (8)
1. A method for analyzing the fire stability of a pulverized coal burner, the method comprising:
After the flame radiation spectrum in the pulverized coal burner is decomposed into three primary colors through a color filter layer, the three primary colors are converted into digital image data in direct proportion to the light intensity;
analyzing and obtaining flame radiation intensity signals according to the digital image data, and calculating and obtaining flame image temperature data according to the corresponding relation between the flame radiation intensity signals and the image and the Planckian law;
obtaining a combustion stability analysis result through binarization processing according to the flame image temperature data;
the combustion stability analysis result obtained by binarization processing according to the flame image temperature data comprises:
according to the temperature of each point on the image in the flame image temperature data, obtaining a temperature matrix through binarization processing;
obtaining a combustion stability analysis result through stability calculation model analysis according to the temperature matrix;
wherein the stability calculation model comprises:
In the above formula, e is the combustion stability analysis result; e i,j is a temperature matrix; i, j are respectively the abscissa and ordinate of the pixel point on the image in the flame image temperature data; i is the total line number of pixel points on the image in the flame image temperature data; j is the total column number of pixel points on the image in the flame image temperature data;
The method further comprises:
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;
the correspondence between the build temperature and the image includes:
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, the corresponding relation between the temperature and the image is constructed through Venn law.
2. The method of claim 1, wherein obtaining a flame radiation intensity signal from the digital image data analysis comprises:
Obtaining the flame radiation intensity signal according to the corresponding monochromatic amplitude intensities of the three primary colors in the digital image data;
Wherein the monochrome amplitude intensity is obtained by the following formula:
in the above formula, R, G, and B are respectively pixel spectrum color values of three primary colors in the digital image data; lambda 1,λ2 is the spectral response range of the image acquisition device; η r,ηg,ηb is the spectral sensitivity coefficient of the three primary colors in the digital image data; lambda r,λg,λb is the spectral response characteristic wavelength of the three primary colors in the digital image data; i λr,Iλg,Iλb is the radiation intensity of the three primary colors in the digital image data; k r,kg,kb is the photoelectric conversion coefficient of the three channels corresponding to the three primary colors in the digital image data.
3. The method of claim 2, wherein calculating flame image temperature data from the flame radiation intensity signal through a correspondence between temperature and image and planck's law comprises:
Flame image temperature data was obtained by calculation using the following formula:
in the above formula, C 2 is the Planckian constant, and T is the flame image temperature.
4. 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 flame radiation spectrum in the pulverized coal burner into three primary colors through the color filtering layer and then 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 corresponding relation between the flame radiation intensity signals and the image and the Planck law;
the analysis module is used for obtaining a combustion stability analysis result through binarization processing according to the flame image temperature data;
the combustion stability analysis result obtained by binarization processing according to the flame image temperature data comprises: according to the temperature of each point on the image in the flame image temperature data, obtaining a temperature matrix through binarization processing; obtaining a combustion stability analysis result through stability calculation model analysis according to the temperature matrix; wherein the stability calculation model comprises:
In the above formula, e is the combustion stability analysis result; e i,j is a temperature matrix; i, j are respectively the abscissa and ordinate of the pixel point on the image in the flame image temperature data; i is the total line number of pixel points on the image in the flame image temperature data; j is the total column number of pixel points on the image in 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; the correspondence between the build temperature and the image includes: 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, the corresponding relation between the temperature and the image is constructed through Venn law.
5. The pulverized coal burner fire stability analysis apparatus as claimed in claim 4, wherein the image acquisition module includes a flame image detector and a conversion unit;
The flame image detector collects flame radiation spectrum in the pulverized coal burner and decomposes the flame radiation spectrum into three primary colors through the color filtering layer;
the conversion unit is used for converting the three primary colors into digital image data which is proportional to the light intensity.
6. The pulverized coal burner fire stability analysis apparatus as claimed in claim 5, wherein the flame image detector includes a color CCD camera.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1 to 3 when executing the computer program.
8. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program for executing the method of any one of claims 1 to 3 by a computer.
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