CN108872102B - Device and method for measuring two-dimensional gas-phase Na concentration field and temperature field of boiler - Google Patents

Device and method for measuring two-dimensional gas-phase Na concentration field and temperature field of boiler Download PDF

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CN108872102B
CN108872102B CN201810551426.4A CN201810551426A CN108872102B CN 108872102 B CN108872102 B CN 108872102B CN 201810551426 A CN201810551426 A CN 201810551426A CN 108872102 B CN108872102 B CN 108872102B
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gas phase
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radiation
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CN108872102A (en
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闫伟杰
娄春
周怀春
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China University of Mining and Technology CUMT
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    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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    • G—PHYSICS
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    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract

The invention discloses a device and a method for measuring a two-dimensional gas phase Na concentration field and a temperature field of a boiler, wherein the device comprises: the first end of the mirror rod is provided with a cooling air outlet, and the second end of the mirror rod is provided with a cooling air inlet; the high-temperature-resistant lens, the three optical imaging lenses and the narrow-band three-channel optical filter are sequentially arranged from the first end to the second end of the mirror rod; the camera protective shell is connected with the second end of the mirror rod; the color CCD camera is arranged in the camera protective shell and provided with a power supply interface for supplying power to the color CCD camera and a network interface for transmitting data and control signals, wherein when the first end of the mirror rod extends into the boiler, radiation light of flames in the boiler sequentially passes through the high-temperature-resistant lens, the three optical imaging lenses and the narrow-band three-channel optical filter and enters a sensor of the color CCD camera to generate monochromatic flame images with three different wavelengths.

Description

Device and method for measuring two-dimensional gas-phase Na concentration field and temperature field of boiler
Technical Field
The invention relates to the technical field of boiler detection, in particular to a device and a method for measuring a two-dimensional gas phase Na concentration field and a temperature field of a boiler.
Background
Xinjiang east Junggar coal is an important coal resource discovered in recent years, the estimated storage amount reaches 3900 hundred million tons, and the Xinjiang east Junggar coal is the largest whole coal field which is proved at present in China. The east Junggar has the advantages of low mining cost, good coal reactivity, low sulfur content, easy burnout and the like. On the other hand, the eastern Junggar coal field is of marine sedimentary type, the K, Na content in the coal primary mineral is relatively high, particularly the Na content, and research shows that the total Na content in the ash is more than 2%, and the Na content in the coal is mainly water-soluble. Water-soluble Na is easy to enter a gas phase in the combustion process, and the gas phase Na is easy to agglomerate when flowing through a heated surface of the boiler along with high-temperature flue gas, so that slag bonding is caused, the safe and economic operation of the boiler is influenced, and the large-scale utilization of the Dongdong coal on a power station boiler is severely restricted.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, the invention aims to provide a device and a method for measuring a two-dimensional gas-phase Na concentration field and a temperature field of a boiler, the device is simple in structure, low in cost and convenient to operate, and the device and the method can realize simultaneous measurement of the two-dimensional gas-phase Na concentration field and the two-dimensional temperature field in the boiler, so that important guarantee is provided for safe and economic operation of the boiler.
In order to achieve the above object, the present invention provides an apparatus for measuring a two-dimensional gas phase Na concentration field and a temperature field of a boiler, comprising: the first end of the mirror rod is provided with a cooling air outlet, and the second end of the mirror rod is provided with a cooling air inlet; the high-temperature-resistant lens, the three optical imaging lenses and the narrow-band three-channel optical filter are sequentially arranged from the first end to the second end of the mirror rod; the camera protective shell is connected with the second end of the mirror rod; the Device comprises a color CCD (charge coupled Device) camera, wherein the color CCD camera is arranged in a camera protective shell and is provided with a power interface for supplying power to the color CCD camera and a network interface for transmitting data and control signals, and when the first end of a lens rod extends into the boiler, radiation light of flame in the boiler sequentially passes through the high-temperature-resistant lens, the three optical imaging lenses and the narrow-band three-channel optical filter and enters a sensor of the color CCD camera to generate monochromatic flame images with three different wavelengths.
In addition, the device for measuring the two-dimensional gas phase Na concentration field and the temperature field of the boiler, which is proposed according to the above embodiment of the invention, can also have the following additional technical characteristics:
according to an embodiment of the present invention, the narrow-band three-channel optical filter has 3 independent optical channels, the central wavelengths of the 3 optical channels are 460nm, 520nm and 589nm, the half-bandwidths of the 3 optical channels are 10nm, the peak transmittances of the 3 optical channels are greater than 90%, the wavelength cut-off ranges of the 3 optical channels are 400-780nm, and the wavelength cut-off depths of the 3 optical channels are less than 0.5%.
According to one embodiment of the invention, the color CCD camera is a 3CCD camera, having three CCD chips.
Further, the color CCD camera has the following spectral response characteristics: r, G, B the relative spectral efficiency of the three channels exceeds 50% of the maximum of the relative spectral response efficiency at 589nm, 520nm and 460nm, respectively; the spectral response of the camera G band at 589nm does not exceed 15% of the highest response value; the relative spectral response of camera G band at 460nm is less than 1% and B band at 520nm is less than 1%.
Further, the color CCD camera outputs an image in a RAW format, the color CCD camera ensures a high signal-to-noise ratio of the acquired flame image by adjusting a camera shutter, and the color CCD camera transmits image data and adjusts camera operation parameters based on gigabit network communication.
The invention provides a method for measuring a two-dimensional gas phase Na concentration field and a temperature field of a boiler based on the device, which comprises the following steps: establishing a functional relation among the two-dimensional gas phase Na concentration, the temperature field and the gas phase Na radiation intensity based on a calibration experiment of the device; mounting the calibrated device on the boiler to acquire a radiation image of flame in the boiler; transmitting the radiation image to an industrial personal computer through the network interface; and the industrial personal computer calculates to obtain a two-dimensional gas phase Na concentration field and a temperature field in the boiler according to the functional relation.
Wherein, based on the calibration experiment of the device establishes the functional relationship among the two-dimensional gas phase Na concentration, the temperature field and the gas phase Na radiation intensity, and specifically comprises the following steps:
a. respectively preparing a plurality of NaCl solutions with different concentrations;
b. putting an ultrasonic atomizer in a container containing a NaCl solution, and starting the ultrasonic atomizer to generate water mist with known NaCl concentration;
c. the ultrasonic atomizer works continuously for a preset time, and the concentration of gas phase Na entering the black body furnace is calculated according to the average atomization rate of the ultrasonic atomizer;
d. setting a plurality of temperature points of the black body furnace;
e. respectively introducing water mist generated by the NaCl solutions with different concentrations into the black body furnace at each temperature point, and acquiring target surface images of the black body furnace at corresponding temperatures by using the device;
f. respectively extracting R channel image intensity data, G channel image intensity data and B channel image intensity data output by the device;
g. respectively converting the R channel image intensity data, the G channel image intensity data and the B channel image intensity data into absolute radiation intensity values by using Planck's law:
Figure BDA0001680329800000041
wherein, c1And c2Respectively a first radiation constant and a second radiation constant;
h. establishing a relation between the absolute radiation intensity value and the image intensity value by using polynomial fitting:
Figure BDA0001680329800000046
Figure BDA0001680329800000047
Figure BDA0001680329800000048
i. the calculated gas-phase Na radiation intensity value
Figure BDA0001680329800000049
And gas phase Na concentration value I in black body furnacejSubstituting the following formula:
Figure BDA0001680329800000042
wherein L is the geometric length of the heating cavity of the blackbody furnace，f1(T) and f2(T) are all fourth order polynomial functions of temperature T:
f1(T)＝a0+a1·T+a2·T2+a3·T3+a4·T4
f2(T)＝b0+b1·T+b2·T2+b3·T3+b4·T4，
wherein, the unknown parameters in the formula are paired by utilizing a particle swarm algorithm
Figure BDA0001680329800000043
And solving to obtain the functional relation among the two-dimensional gas phase Na concentration, the temperature field and the gas phase Na radiation intensity as follows:
Figure BDA0001680329800000044
wherein, T is solved by a bicolor method:
Figure BDA0001680329800000045
the device has simple structure, low cost and convenient operation, can realize the simultaneous measurement of the two-dimensional gas-phase Na concentration field and the two-dimensional temperature field in the boiler, and provides important guarantee for the safe and economic operation of the boiler.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for measuring a two-dimensional gas phase Na concentration field and a temperature field of a boiler according to one embodiment of the present invention;
FIG. 2 is a graph of relative spectral response of a color CCD camera and a three channel color filter according to one embodiment of the present invention;
FIG. 3 is a flow chart of a method of measuring a two-dimensional gas phase Na concentration field and a temperature field of a boiler according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of a calibration system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a measurement system according to an embodiment of the present invention.
Reference numerals:
0-mirror rod; 1-high temperature resistant lens; 2-cooling air outlet; 3-an optical imaging lens; 4-cooling air inlet; 5-narrow band three-channel optical filter; 6-color CCD camera; 7-a camera protective case; 8-power interface; 9-a network interface; 10-a power supply; 11-a measuring device; 12-black body furnace; 13-a gas mass flow meter; 14-a glass tube container; 15-ultrasonic atomizer; 16-an industrial personal computer; 17-a data transmission line; an 18-gigabit network switch; 19-cooling air pipeline; 20-boiler furnace.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes an apparatus and a method for measuring a two-dimensional gas phase Na concentration field and a temperature field of a boiler according to an embodiment of the present invention with reference to the accompanying drawings.
The boiler of the embodiment of the invention is a coal-fired boiler, and is preferably suitable for a boiler burning high-alkali coal such as east-Junggar coal.
As shown in fig. 1, the apparatus for measuring a two-dimensional gas phase Na concentration field and a temperature field of a boiler according to an embodiment of the present invention includes: a mirror lever 0; the high-temperature-resistant lens 1, the three optical imaging lenses 3 and the narrow-band three-channel optical filter 5 are sequentially arranged from the first end to the second end of the mirror rod 0; a camera protective case 7; a color CCD camera 6. Wherein, the first end of the mirror rod 0 is provided with a cooling air outlet 2, and the second end of the mirror rod 0 is provided with a cooling air inlet 4; the camera protective shell 7 is connected with the second end of the mirror rod 0; the color CCD camera 6 is provided within a camera protective case 7, and the color CCD camera 6 has a power supply interface 8 for supplying power to the color CCD camera 6 and a network interface 9 for data and control signal transmission.
When the first end of the mirror rod 0 extends into the boiler, radiation light of flame in the boiler sequentially passes through the high-temperature-resistant lens 1, the three optical imaging lenses 3 and the narrow-band three-channel optical filter 5 to enter a sensor of the color CCD camera 6, so that monochromatic flame images with three different wavelengths are generated.
In one embodiment of the present invention, the high temperature resistant lens 1 may be made of high temperature resistant glass. The narrow-band three-channel optical filter can be provided with 3 independent optical channels, the central wavelengths of the 3 optical channels are 460nm, 520nm and 589nm respectively, the half-bandwidths of the 3 optical channels are 10nm, the peak transmittances of the 3 optical channels are all greater than 90%, the wavelength cut-off ranges of the 3 optical channels are 400-780nm, and the wavelength cut-off depths of the 3 optical channels are all less than 0.5%.
In one embodiment of the present invention, the color CCD camera 6 is a 3CCD camera having three CCD chips. The color CCD camera 6 can generate monochromatic flame images with three different wavelengths of 460nm, 520nm and 589 nm.
Further, referring to fig. 2, the color CCD camera 6 has the following spectral response characteristics: r, G, B the relative spectral efficiency of the three channels is higher at 589nm, 520nm and 460nm, which exceed 50% of the maximum value of the relative spectral response efficiency; the spectral response of the camera G spectral band is relatively weak at 589nm and does not exceed 15% of the highest response value, so that the superposition interference of gaseous Na radiation at 589nm on the camera G spectral band receiving signal is avoided, and the temperature measurement accuracy is improved. The relative spectral response of camera G band at 460nm is less than 1%, for example 0, and the relative spectral response of B band at 520nm is less than 1%, for example 0, so as to improve the monochromaticity of G, B signal measured by the camera and improve the temperature measurement accuracy.
The color CCD camera 6 can output a RAW format image to output an 8-bit image intensity value independent of the camera shutter time. The non-saturation, high signal-to-noise ratio of the acquired flame image can be ensured by adjusting the camera shutter. The color CCD camera 6 can perform image data transmission and adjustment of camera operation parameters based on gigabit network communication.
In one embodiment of the present invention, the color CCD camera 6 model may be a JAR-AT-200GE model, but embodiments of the present invention are not limited to this type of camera.
The device of the above embodiment of the present invention can be used for measuring the two-dimensional gas phase Na concentration field and the temperature field of the boiler, and the following embodiment will explain the measuring method in detail.
As shown in fig. 3, the measurement method includes the steps of:
and S1, establishing a functional relation among the two-dimensional gas phase Na concentration, the temperature field and the gas phase Na radiation intensity based on the calibration experiment of the device.
In one embodiment of the present invention, a calibration system shown in fig. 4 may be constructed, and the calibration system includes the above-mentioned device 11 for measuring a two-dimensional gas phase Na concentration field and a temperature field of a boiler, a blackbody furnace 12, a gas mass flow meter 13, a glass tube container 14, an ultrasonic atomizer 15, an industrial personal computer 16, a data transmission line 17, and a power supply 10 for supplying power to the above-mentioned device 11, the ultrasonic atomizer 15, and the like.
The establishment of the functional relationship through calibration experiments specifically comprises the following steps a to i:
a. and respectively preparing a plurality of NaCl solutions with different concentrations.
For example, eight NaCl solutions of different concentrations, No. 1 to No. 8, shown in Table 1, can be prepared.
TABLE 1
Figure BDA0001680329800000081
b. An ultrasonic atomizer is placed in a container containing a NaCl solution, and is started to generate water mist with known NaCl concentration.
The ultrasonic atomizer 15 can be controlled to be turned on by a power switch to generate the concentration
Figure BDA0001680329800000082
The water mist of (1). Nitrogen gas N2After passing through the gas mass flow meter 13, the nitrogen gas was introduced into the glass tube vessel 14 at a flow rate of 100ml/min, and the nitrogen gas carried the mist containing a known NaCl concentration into the high temperature black body furnace 12.
c. And (3) continuously working the ultrasonic atomizer for a preset time, and calculating the concentration of gas phase Na entering the black body furnace according to the average atomization rate of the ultrasonic atomizer.
For example, when the ultrasonic atomizer 15 is continuously operated for 30 minutes, the average atomization rate of the ultrasonic atomizer 15 is measured as Vs(g/min), the gas phase Na concentration I in the black body furnacej(j ═ 1,2,3.. 7,8) is:
Figure BDA0001680329800000083
d. a plurality of temperature points of the black body furnace are set.
The high temperature black body furnace 12 may be provided with an observation window, and the temperature T of the high temperature black body furnace 12 during the experiment is set as follows: the starting temperature was 900 deg.C, the end temperature was 1700 deg.C, and the temperature interval was 20 deg.C, for a total of 41 temperature points.
e. And respectively introducing water mist generated by NaCl solutions with different concentrations into the black body furnace at each temperature point, and acquiring the target surface image of the black body furnace at the corresponding temperature by using the device.
At 41 temperature points, the NaCl water mist with eight concentrations shown in the table 1 is respectively introduced, and the target surface image of the black body furnace is collected, so that 8 x 41 groups of image data can be obtained.
f. And respectively extracting the R channel image intensity data, the G channel image intensity data and the B channel image intensity data output by the device.
589nm R channel image intensity data S output by the device 11 can be respectively extracted by using a Matlab program of an industrial personal computer 16R520nm G channel image intensity data SGAnd 460nm B channel image intensity data SB。
g. Respectively converting R channel image intensity data S by using Planck' S lawRG channel image intensity data SGAnd B channel image intensity data SBConversion to absolute radiation intensity values:
Figure BDA0001680329800000091
wherein, c1And c2Respectively a first radiation chamber and a second radiation chamberAnd (4) counting.
h. Establishing a relation between the absolute radiation intensity value and the image intensity value by using polynomial fitting:
Figure BDA0001680329800000092
i. the calculated gas-phase Na radiation intensity value
Figure BDA0001680329800000094
And gas phase Na concentration value I in black body furnacejSubstituting the following formula:
Figure BDA0001680329800000093
wherein L is the geometric length of the heating cavity of the blackbody furnace, f1(T) and f2(T) are all fourth order polynomial functions of temperature T:
f1(T)＝a0+a1·T+a2·T2+a3·T3+a4·T4
f2(T)＝b0+b1·T+b2·T2+b3·T3+b4·T4(5)
wherein is measured
Figure BDA0001680329800000101
There are 328 values in total, and the unknown parameter a in the formula (5)0～b4Can use particle swarm algorithm pair
Figure BDA0001680329800000102
Namely, the formula (4) is solved.
After calibration is completed, the functional relation among the two-dimensional gas phase Na concentration, the temperature field and the gas phase Na radiation intensity is obtained as follows:
Figure BDA0001680329800000103
wherein, T is solved by a bicolor method:
Figure BDA0001680329800000104
and S2, installing the calibrated device on the boiler to acquire a radiation image of the flame in the boiler.
As shown in fig. 5, the whole system for measuring the two-dimensional gas phase Na concentration field and the temperature field of the boiler includes a plurality of the devices 11, an industrial personal computer 16, a data transmission line 17, a gigabit network switch 18, a cooling air pipeline 19 corresponding to the cooling air inlet 4, and a boiler furnace 20.
Referring to fig. 5, a plurality of devices 11 can be installed at different heights of a boiler furnace 20, and radiation images of pulverized coal combustion flames in the boiler are acquired on line through observation holes in a water-cooled wall.
And S3, transmitting the radiation image to an industrial personal computer through a network interface.
As shown in fig. 5, the radiation images acquired by the plurality of devices 11 may be transmitted to the industrial personal computer 16 through the gigabit network switch 18.
And S4, the industrial personal computer calculates the two-dimensional gas phase Na concentration field and the temperature field in the boiler according to the functional relation.
The industrial personal computer 16 may be used to calculate and store data. The industrial personal computer 16 can firstly calculate to obtain a two-dimensional temperature field in the furnace by using radiation images of 520nm and 460nm based on the formula (7); and secondly, substituting the calculated two-dimensional temperature field into the formula (6), and calculating to obtain the distribution of the Na concentration of the two-dimensional gas phase in the furnace by combining the measured 589nm radiation image.
In addition, the interface of the industrial personal computer 16 can display the flame image, the two-dimensional flame temperature field and the gas phase Na concentration field in real time, and the measurement result is stored in a computer hard disk in real time.
According to the device and the method for measuring the two-dimensional gas-phase Na concentration field and the temperature field of the boiler, the device is simple in structure, low in cost and convenient to operate, the two-dimensional gas-phase Na concentration field and the two-dimensional temperature field in the boiler can be measured simultaneously through the device and the method, and important guarantee is provided for safe and economical operation of the boiler.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (1)

1. A method for measuring a two-dimensional gas phase Na concentration field and a temperature field of a boiler based on an apparatus for measuring a two-dimensional gas phase Na concentration field and a temperature field of a boiler, the apparatus comprising: the first end of the mirror rod is provided with a cooling air outlet, and the second end of the mirror rod is provided with a cooling air inlet; the high-temperature-resistant lens, the three optical imaging lenses and the narrow-band three-channel optical filter are sequentially arranged from the first end to the second end of the mirror rod; the camera protective shell is connected with the second end of the mirror rod; the color CCD camera is arranged in the camera protective shell and provided with a power interface for supplying power to the color CCD camera and a network interface for transmitting data and control signals, when the first end of the lens rod extends into the boiler, radiation light of flames in the boiler sequentially passes through the high-temperature-resistant lens, the three optical imaging lenses and the narrow-band three-channel optical filter and enters a sensor of the color CCD camera to generate monochromatic flame images with three different wavelengths, and the method comprises the following steps:
establishing a functional relation among the two-dimensional gas phase Na concentration, the temperature field and the gas phase Na radiation intensity based on a calibration experiment of the device;
mounting the calibrated device on the boiler to acquire a radiation image of flame in the boiler;
transmitting the radiation image to an industrial personal computer through the network interface;
the industrial personal computer calculates and obtains a two-dimensional gas phase Na concentration field and a temperature field in the boiler according to the functional relation,
wherein, based on the calibration experiment of the device establishes the functional relationship among the two-dimensional gas phase Na concentration, the temperature field and the gas phase Na radiation intensity, and specifically comprises the following steps:
a. respectively preparing a plurality of NaCl solutions with different concentrations;
b. putting an ultrasonic atomizer in a container containing a NaCl solution, and starting the ultrasonic atomizer to generate water mist with known NaCl concentration;
c. the ultrasonic atomizer works continuously for a preset time, and the concentration of gas phase Na entering the black body furnace is calculated according to the average atomization rate of the ultrasonic atomizer;
d. setting a plurality of temperature points of the black body furnace;
e. respectively introducing water mist generated by the NaCl solutions with different concentrations into the black body furnace at each temperature point, and acquiring target surface images of the black body furnace at corresponding temperatures by using the device;
f. respectively extracting R channel image intensity data, G channel image intensity data and B channel image intensity data output by the device;
g. respectively converting the R channel image intensity data, the G channel image intensity data and the B channel image intensity data into absolute radiation intensity values by using Planck's law:
Figure FDA0002600942350000021
wherein, c1And c2Respectively a first radiation constant and a second radiation constant;
h. establishing a relation between the absolute radiation intensity value and the image intensity value by using polynomial fitting:
Figure FDA0002600942350000022
i. the calculated gas-phase Na radiation intensity value
Figure FDA0002600942350000023
And gas phase Na concentration value I in black body furnacejSubstituting the following formula:
Figure FDA0002600942350000024
wherein L is the geometric length of the heating cavity of the blackbody furnace, f1(T) and f2(T) are all fourth order polynomial functions of temperature T:
f1(T)＝a0+a1·T+a2·T2+a3·T3+a4·T4
f2(T)＝b0+b1·T+b2·T2+b3·T3+b4·T4，
wherein, the unknown parameters in the formula are paired by utilizing a particle swarm algorithm
Figure FDA0002600942350000031
Is solved to obtainTo that end, the functional relationship between the two-dimensional gas phase Na concentration, the temperature field, and the gas phase Na radiation intensity is:
Figure FDA0002600942350000032
wherein, T is solved by a bicolor method:
Figure FDA0002600942350000033
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