Spray morphology visualization and droplet group temperature measurement device under high-temperature flue gas

Abstract

The present invention discloses a device for visualizing spray morphology and measuring temperature of a droplet group under the action of high-temperature flue gas, comprising a smoke dispersing device, the smoke dispersing device being connected to a sealed container, a spray device being arranged in the sealed container, and a laser-induced fluorescence temperature measuring device acting on the spray device. The present invention effectively eliminates the temperature measurement error caused by the longitudinal attenuation of the laser intensity, realizes the quantitative analysis of the temperature data of the spray droplet group, and restores the morphological changes of the spray droplet group under the action of high-temperature flue gas.

Description

Technical Field

[0001] The invention belongs to the technical field of advanced laser measurement, and relates to a device for visualizing spray morphology and measuring the temperature of a droplet group under the action of high-temperature flue gas. Background Art

[0002] Spray cooling of high-temperature flue gas is widely used in various fields, including fire safety, industrial flue gas control, gas turbine exhaust cooling, etc. The optimal adaptation range of spray parameters in different fields is inconsistent. Accurate adjustment of spray parameters (droplet temperature, spray pressure, etc.) is conducive to cooling and suppressing high-temperature flue gas. In the field of fire safety, by analyzing the temperature distribution of droplets in high-temperature flue gas, the evaporation heat absorption of droplets can be obtained, which is helpful to clarify whether the heat exchange of droplets is sufficient; in the field of industrial flue gas control, in order to avoid the damage of droplets to the processed materials, the spray eliminates the momentum and cools the high-temperature flue gas, and it is necessary to accurately control the movement range and shape of droplets; in terms of gas turbine exhaust cooling, spray treatment of gas turbine exhaust requires rapid evaporation of droplets and efficient cooling. In these scenarios, the precise adjustment of spray parameters requires accurate evaluation of the heat exchange effect of high-temperature flue gas and spray, the weakening effect of flue gas momentum, and the scope of action and flow morphology of the droplet field. Therefore, it is necessary to develop a spray morphology visualization and droplet group temperature measurement device under the action of high-temperature flue gas. Summary of the invention

[0003] The purpose of the present invention is to provide a device for visualizing spray morphology and measuring the temperature of droplet groups under the action of high-temperature flue gas, which effectively eliminates the temperature measurement error caused by the longitudinal attenuation of laser intensity, realizes the quantitative analysis of the temperature data of the spray droplet group, and restores the morphological changes of the spray droplet group under the action of high-temperature flue gas.

[0004] The technical solution adopted by the present invention is a device for visualizing spray morphology and measuring droplet group temperature under the action of high-temperature flue gas, including a flue gas dispersing device, the flue gas dispersing device is connected to a sealed container, a spray device is arranged in the sealed container, and a laser induced fluorescence temperature measuring device acts on the spray device.

[0005] The present invention is also characterized in that:

[0006] The smoke dispersing device comprises a centrifugal fan, a heater and a static pressure box which are connected in sequence through an air supply duct; the static pressure box is connected to a sealed container through an air supply port which is arranged obliquely.

[0007] The spray device comprises a siphon air atomizing nozzle, which is located in a closed container, one side of the siphon air atomizing nozzle is connected to an air compressor through an air supply pipe, and the other side of the siphon air atomizing nozzle is connected to a water pump through a water supply pipe. The water pump is located in a plexiglass container, and the plexiglass container is placed on a heatable magnetic stirrer.

[0008] A pressure gauge is provided on the air supply pipe.

[0009] A flow meter is provided on the water supply pipe.

[0010] The siphon type air atomizing nozzle is mounted on a fixed bracket.

[0011] The laser induced fluorescence temperature measuring device comprises a laser, the laser is connected to a CCD camera, a filter is installed at the lens of the CCD camera, and a synchronizer is arranged on the connecting line between the laser and the CCD camera.

[0012] The method for measuring the temperature of a spray droplet group of a spray morphology visualization and a droplet group temperature measurement device under the action of high-temperature flue gas specifically comprises the following steps:

[0013] Step 1: prepare a fluorescent molecule aqueous solution in a plexiglass container, stir the fluorescent molecule aqueous solution evenly and heat it using a heatable magnetic stirrer. The temperature range of heating the fluorescent molecule aqueous solution is 24°C to 50°C. When the concentration of the fluorescent solution is constant, the fluorescence intensity and the temperature of the aqueous solution under the same laser intensity meet the following relationship, see formula (1):

[0014]

[0015] In the formula, I t is the fluorescence intensity, I j is the intensity of the excitation light, C is the concentration of the fluorescent solution, is the quantum efficiency, ε is the molar absorption coefficient, λ e / λ f is the ratio of the excitation light to the fluorescence wavelength;

[0016] Step 2, collecting a fluorescence image of the fluorescent molecule aqueous solution after being excited by the laser through a CCD camera;

[0017] Step 3: Use MATLAB to obtain the fluorescence intensity data matrix of the fluorescence image at each temperature, and select the center column I of the matrix i The maximum value is the reference value I0, using Get the average error correction coefficient e at each temperature t , then use formula I y =e t I t Get the corrected fluorescence intensity value I of the fluorescence image corresponding to each temperature y ;

[0018] Step 4, using a computer to extract the corrected fluorescence intensity value from the image, normalizing the fluorescence intensity values ​​corresponding to different temperatures, and using formula (1) to obtain a calibration curve of temperature-fluorescence intensity of the fluorescent molecule aqueous solution;

[0019] Step 5, starting the high-temperature flue gas dispersing device and the spray device, using the fluorescent molecule aqueous solution as a water source to form a spray, collecting the spray fluorescence image when the spray interacts with the high-temperature flue gas, and realizing the visualization of the spray morphology;

[0020] Step 6, using the established calibration curve of temperature-fluorescence intensity of the fluorescent molecule aqueous solution, the fluorescence intensity value in the spray fluorescence image is converted into a temperature value through a fluorescence image post-processing algorithm to obtain the temperature distribution of the spray droplet group.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. Aiming at the spray droplet group under the action of high-temperature flue gas, the present invention designs a simple and easy-to-implement laser-induced fluorescence droplet temperature measurement device, which can non-invasively measure the temperature distribution of the spray droplet group under the action of high-temperature flue gas. Specifically, the excitation of fluorescent molecules and the transient capture of spray fluorescence images can be achieved with only a single laser and CCD camera.

[0023] 2. The present invention utilizes the correspondence between the temperature and fluorescence intensity of the fluorescent aqueous solution to compile a spray fluorescence image post-processing algorithm under the high-temperature flue gas-spray interaction process, which can obtain flow field parameters such as spray morphology changes, spray diffusion range, and spray droplet group temperature.

[0024] 3. Since the longitudinal attenuation of laser intensity will weaken the luminous intensity of fluorescent molecules after being excited, the fluorescence intensity on the fluorescence image gradually decreases along the longitudinal direction, affecting the accuracy of the temperature measurement of the spray droplet group. The present invention compensates for the laser intensity by determining the average correction coefficient at each temperature, thereby correcting the temperature measurement error caused by the longitudinal attenuation of the laser intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the device for visualizing the spray morphology and measuring the temperature of the droplet group under the action of high-temperature flue gas of the present invention;

[0026] Figure 2 It is a schematic diagram of laser-induced fluorescence temperature calibration of the spray morphology visualization and droplet group temperature measurement device under the action of high-temperature flue gas of the present invention;

[0027] Figure 3 It is a flow chart of the image processing and calibration curve establishment in the device for measuring the spray morphology visualization and droplet group temperature under the action of high-temperature flue gas of the present invention;

[0028] Figure 4 It is a flow chart of the correction of the longitudinal attenuation error of the laser intensity in the device for measuring the spray morphology visualization and droplet group temperature under the action of high-temperature flue gas of the present invention;

[0029] Figure 5It is a graph of error correction coefficients of longitudinal attenuation of laser intensity at various temperatures measured by the spray morphology visualization and droplet group temperature measurement device under the action of high-temperature flue gas of the present invention;

[0030] Figure 6 It is the temperature-fluorescence intensity calibration curve measured by the spray morphology visualization and droplet group temperature measurement device under the action of high-temperature flue gas of the present invention;

[0031] Figure 7 It is a visualization example diagram of the spray morphology visualization and droplet group temperature measurement device under the action of high-temperature flue gas and the spray morphology change at different high-temperature flue gas emission speeds;

[0032] Figure 8 It is a visualization example diagram of the spray morphology visualization and droplet group temperature measurement device under the action of high-temperature flue gas and the spray morphology change at different high-temperature flue gas emission angles;

[0033] Fig. 9 It is a visualization example diagram of the spray morphology visualization and droplet group temperature measurement device under the action of high-temperature flue gas and the spray morphology change under different nozzle pressures;

[0034] Fig.10 It is a visualization example diagram of the spray morphology visualization and droplet group temperature measurement device under the action of high-temperature flue gas and the spray morphology change at different nozzle flow rates;

[0035] Fig.11 It is a visualization example diagram of the spray morphology visualization and droplet group temperature measurement device under the action of high-temperature flue gas of the present invention, which measures the spray droplet group temperature distribution and spray morphology changes at different nozzle dimensionless heights.

[0036] In the figure, 1. centrifugal fan, 2. heater, 3. static pressure box, 4. air supply port, 5. air supply duct, 6. siphon air atomizing nozzle, 7. air compressor, 8. air supply pipe, 9. pressure gauge, 10. flow meter, 11. water supply pipe, 12. water pump, 13. heatable magnetic stirrer, 14. temperature sensor, 15. air supply port, 16. laser, 17. CCD camera, 18. filter, 19. synchronizer, 20. computer, 21. fixed bracket, 22. image acquisition area, 23. plexiglass container, 24. fluorescent molecule aqueous solution, 25. sealed container. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Example 1

[0039] The device for visualizing spray morphology and measuring droplet group temperature under the action of high-temperature flue gas of the present invention is as follows: Figure 1 As shown, it includes: a smoke dispersing device, a spray device, and a laser induced fluorescence temperature measuring device.

[0040] The high-temperature flue gas dispersing device includes a centrifugal fan 1, a heater 2, a static pressure box 3, an air outlet 4, and an air supply duct 5. The centrifugal fan 1 and the heater 2 jointly control the speed and temperature of the high-temperature flue gas, and the air outlets 4 with three different inclination angles correspond to the generation of high-temperature flue gas with three different dispersing angles. The air supply duct 5 is wrapped with an insulation layer to slow down the heat attenuation along the way.

[0041] The spray device includes a siphon air atomizing nozzle 6, an air compressor 7, an air supply pipe 8, a pressure gauge 9, a flow meter 10, a water supply pipe 11, and a water pump 12. The siphon air atomizing nozzle 6 is located in a sealed container 25, and an air supply port 15 is provided on the sealed container 25.

[0042] The water pump 12 delivers the fluorescent solution to the siphon air atomizing nozzle 6, and the liquid forms a spray under the pressure provided by the air compressor 7. A pressure gauge 9 and a flow meter 10 are respectively installed on the air supply pipe 8 and the water supply pipe 11 connected to the two sides of the siphon air atomizing nozzle 6 to adjust the pressure and flow of the spray. The position of the siphon air atomizing nozzle 6 can be adjusted in height by a fixed bracket 21.

[0043] The laser induced fluorescence temperature measuring device includes a laser 16, a CCD camera 17, a filter 18, a synchronizer 19, a heatable magnetic stirrer 13, and a temperature sensor 14. The fluorescent solution is prepared by the heatable magnetic stirrer 13. The laser 16 generates laser light of a specific wavelength for exciting the fluorescent molecules contained in the spray droplets.

[0044] The CCD camera 17 captures the spray fluorescence image after being excited by the laser 16. The capture area of ​​the CCD camera 17 can be adjusted by the camera coordinate digital control device. The filter 18 is installed in front of the lens of the CCD camera 17, effectively blocking the laser emitted by the laser 16 and only transmitting the fluorescence emitted by the fluorescent molecules after being excited, thereby improving the accuracy of the temperature measurement data. The synchronizer 19 is used to coordinate and control the on and off time of the laser 16 and the CCD camera 17. The shooting time of the CCD camera 17 and the laser emission time need to be reasonably set to obtain the expected shooting results.

[0045] After the centrifugal fan 1 generates airflow, it is sent to the heater 2 through the air supply duct 5 to be heated to form high-temperature flue gas. The high-temperature flue gas passes through the static pressure box 3 and is sent out through the air supply ports 4 with different inclination angles.

[0046] The laser 16 is a Nd:YAG pulsed solid-state laser.

[0047] The CCD camera 17 is a grayscale display with a resolution of 2560×2160 pixels. The camera coordinates are moved using a digital control device, which can achieve precise control of the shooting window.

[0048] Example 2

[0049] The present invention proposes a method for measuring the temperature of a spray droplet group based on fluorescence intensity by using the above device for visualizing the temperature and spray morphology of a spray droplet group under the interaction between spray and high-temperature flue gas, which specifically includes the following steps:

[0050] Step 1, such as Figure 2 As shown, a fluorescent water molecule solution is prepared. First, a fluorescent molecule aqueous solution 24 of a certain concentration is prepared in an organic glass container 23, and a heatable magnetic stirrer 13 is used to stir the fluorescent molecule aqueous solution evenly and heat it. The temperature range of the fluorescent solution heating is 24°C to 50°C, with an interval of 1°C. When the concentration of the fluorescent solution is constant, the fluorescence intensity and the temperature of the aqueous solution under the same laser intensity meet the following relationship, see formula (1):

[0051]

[0052] In the formula, I t is the fluorescence intensity, I j is the intensity of the excitation light, C is the concentration of the fluorescent solution, is the quantum efficiency (quantitatively related to the temperature of the aqueous solution), ε is the molar absorption coefficient, λ e / λ f is the ratio of the excitation light wavelength to the fluorescence wavelength.

[0053] Step 2: Obtain the fluorescence image within the required temperature range. After preparing and heating the fluorescent molecule aqueous solution, Figure 3 As shown, a plurality of fluorescence images of the fluorescent molecule aqueous solution after being excited by the laser 16 are collected by the CCD camera 17, and the high-speed camera collects the fluorescence images at the temperature at intervals of 1°C. 200 fluorescence images are collected each time, and the mean is extracted to reduce the error.

[0054] Step 3, determine the average correction coefficient at each temperature. The fluorescence image reflects the fluorescence intensity of the fluorescent solution at the corresponding temperature in the container, such as Figure 4 As shown, MATLAB is used to obtain the fluorescence intensity data matrix of the fluorescence image at each temperature, and the center column I of the matrix is ​​selected. i The maximum value is the reference value I0, using Get the average error correction coefficient e at each temperature t , then use formula I y =e t I tGet the corrected fluorescence intensity value I of the fluorescence image corresponding to each temperature y .

[0055] Step 4, eliminate the temperature measurement error. Compensate the laser intensity along the longitudinal direction of the fluorescence image to eliminate the temperature measurement error caused by the longitudinal attenuation of the laser intensity. Use computer 20 image processing software to extract the corrected fluorescence intensity value from the image, normalize the fluorescence intensity values ​​corresponding to different temperatures, and use formula (1) to obtain the calibration curve of the temperature-fluorescence intensity of the fluorescent molecule aqueous solution.

[0056] Step 5, start the high-temperature flue gas dispersing device and the spray device, use the fluorescent molecular aqueous solution as a water source to form a spray, collect the spray fluorescence image when the spray interacts with the high-temperature flue gas, and realize the visualization of the spray morphology. First, turn on the centrifugal fan 1 and the heater 2, and the high-temperature flue gas is sent into the sealed container 25 (the sealed container 25 is provided with an air supply port 15) through the static pressure box 3 and the air supply port 4. At the same time, turn on the air compressor 7 and the water pump 12, control the pressure gauge 9 and the flow meter 10 to achieve air pressure balance, and the fluorescent molecular aqueous solution 24 forms a spray through the siphon air atomization nozzle 6. The spray fluorescence image when the spray excited by the laser 16 interacts with the high-temperature flue gas is collected in the image acquisition area 22 by the CCD camera 17.

[0057] Step 6, using the established calibration curve of temperature-fluorescence intensity of the fluorescent molecule aqueous solution, the fluorescence intensity value in the spray fluorescence image is converted into a temperature value through the fluorescence image post-processing algorithm to obtain the temperature distribution of the spray droplet group. The specific process of step 6 is:

[0058] Step 6.1, name the captured spray fluorescence original image pw1.tif as a1;

[0059] Step 6.2, display image a1 in matlab;

[0060] Step 6.3, because the original spray fluorescence image is taken by PIV, which is different from the image format in MATLAB, the grayscale value of image a1 needs to be multiplied by 16 to keep it consistent with the value in the PIV image, and image a2 can be obtained before it can be processed in MATLAB;

[0061] Step 6.3, display image a2 in matlab;

[0062] Step 6.4, remove the overexposed points and unify the spray image background to the grayscale value corresponding to the ambient temperature. The processed spray image is named c2;

[0063] Step 6.5, according to the established formula of the relationship curve between temperature and fluorescence intensity, convert the fluorescence intensity value in the image data matrix corresponding to the processed spray image c2 into temperature pwT1 (① Note: the grayscale value of each pixel in the image represents the fluorescence intensity value of the pixel, and the relationship curve formula is y = -14.806x + 1439.9, y represents the fluorescence intensity, that is, the grayscale value of each pixel in the image, and x represents the temperature. For the image being processed, y is c2, and x is the required temperature value pwT1) (② Note: the relationship curve formula 1 used here is: y = -14.806x + 1439.9, and the formula 2 written in the present invention: y = -0.0134x + 1.3007 is obtained after normalizing formula 1).

[0064] Step 6.6, convert the image into a pseudo-color image for visualizing temperature distribution according to the temperature data matrix corresponding to the image pwT1;

[0065] Tip: When processing with MATLAB, each pixel of the image corresponds to a specific grayscale value, forming a data matrix. The above image processing process is actually processing and converting these data. For example, a1, a2, b2, and pwT1 are actually data matrices.

[0066] A fluorescent molecule aqueous solution of a certain concentration is prepared, and a heatable magnetic stirrer 13 is used to stir the fluorescent molecule aqueous solution evenly and heat it. Multiple fluorescence images of the fluorescent molecule aqueous solution after being excited by the laser 16 are collected by the CCD camera 17, and the collection interval is 1°C. Laser intensity correction is performed on each collected image, and a standard value is determined at each temperature as a correction reference. The error caused by the uneven longitudinal distribution of the laser intensity is eliminated by the compensation method. The fluorescence intensity value is extracted from the corrected fluorescence image, and the fluorescence intensity values ​​corresponding to different temperatures are normalized to obtain a calibration curve of the temperature-fluorescence intensity of the fluorescent molecule aqueous solution. Furthermore, the high-temperature flue gas dissipation device and the spray device are started to collect the spray fluorescence image when the spray interacts with the high-temperature flue gas to realize the visualization of the spray morphology. Using the calibration curve of the temperature-fluorescence intensity of the fluorescent molecule aqueous solution, the fluorescence intensity value in the spray fluorescence image is converted into a temperature value to obtain the temperature distribution of the spray droplet group.

[0067] Example 3

[0068] Preparation of fluorescent molecule aqueous solution (taking Rhodamine B as an example): Rhodamine B is easily soluble in water, and its temperature sensitivity coefficient is -2.38. Weigh 50 mg of Rhodamine B fluorescent molecule and use dilution method to obtain 0.1 mg / L Rhodamine B aqueous solution. Stir the Rhodamine B aqueous solution evenly and heat it with a heatable magnetic stirrer 13. The temperature range of heating the fluorescent solution is 24 to 50°C ( Figure 3 The processed fluorescence image examples are at 26°C, 34°C, 42°C and 50°C). A Nd:YAG pulsed solid laser 16 is used as the laser light source with a wavelength of 532nm, a frequency of 1 to 10Hz, and a pulse energy of 500mJ / Pulse. The resolution of the CCD camera 17 for fluorescence image acquisition is 2560×2160 pixels, the maximum frequency can reach 40Hz, and the grayscale display is 16 bits. A synchronizer 19 is used to control the on and off time of the laser 16 and the CCD camera 17. The CCD camera 17 is used to capture the fluorescence images of the Rhodamine B aqueous solution in the temperature range of 24 to 50°C, with an acquisition interval of 1°C, and 200 fluorescence images are collected each time.

[0069] like Figure 5 As shown in the figure, extract the fluorescence image data matrix of Rhodamine B aqueous solution at each temperature, select the center column I of the matrix i The maximum value is the reference value I0, using e t =I0 / I i Get the average error correction coefficient e at each temperature t .like Figure 6 As shown, MATLAB software was used for post-processing, and the corrected fluorescence intensity values ​​corresponding to different temperatures were normalized to obtain a calibration curve of temperature-fluorescence intensity of a 0.1 mg / L Rhodamine B aqueous solution. The equation of the curve is: y = -0.0134x + 1.3007, R 2 The value is 0.99.

[0070] Start the high-temperature flue gas dispersing device and the spray device. The temperature of the high-temperature flue gas heated by the heater 2 is 130°C. The air outlets 4 with different inclination angles and the centrifugal fan 1 are used to form high-temperature flue gas with different dispersing angles and dispersing speeds. After the flue gas is stable, turn on the spray device, use the Rhodamine B aqueous solution as the water source to form a spray, and use the pressure gauge 9 and the flow meter 10 to control the spray pressure and spray flow. When the spray pressure and flow are stable, start the laser and CCD camera at the same time, shoot single frames, the shooting frequency is 10hz, and take a total of 200 spray fluorescence images. Because the laser intensity gradually increases from weak when the laser is just started, and the intensity will also decay when the laser is about to be turned off, the middle 100 relatively stable and uniform spray fluorescence images are selected for image processing. The experimental influencing factors and variables provided by the present invention are shown in Table 1 below:

[0071] Table 1 Experimental variables

[0072]

[0073] like Figure 7 to Figure 11 The figure shows the use of a CCD camera 17 to collect spray fluorescence images under the influence of different high-temperature smoke emission parameters and spray parameters after being excited by a laser 16. The image collection area 22 is the intersection of the spray and the high-temperature smoke.

[0074] Figure 7 The temperature distribution of the spray droplet group and the change of the spray morphology under different high-temperature smoke emission speeds are shown, and 2m / s, 4m / s, and 6m / s are used as examples for explanation;

[0075] Figure 8 The temperature distribution of the spray droplet group and the change of the spray morphology under different high-temperature flue gas emission angles are shown in Figure 1, with 15°, 30°, and 45° as examples.

[0076] Fig. 9 The temperature distribution of the spray droplet group and the change of the spray morphology under different nozzle pressures are shown in Figure 1, which are specifically described using 0.1MPa, 0.25Mpa, and 0.4MPa as examples.

[0077] Fig.10 The temperature distribution of the spray droplet group and the change of the spray morphology under different nozzle flow rates are shown in Figure 4, taking 4L / h, 10L / h, and 16L / h as examples.

[0078] Fig.11 The temperature distribution of the spray droplet group and the change of the spray morphology at different dimensionless nozzle heights are shown, and 1 / 3, 2 / 3, and 1 are used as examples for explanation;

[0079] The fluorescence image was post-processed using MATLAB to achieve visualization of the spray morphology. The obtained 0.1 mg / L Rhodamine B aqueous solution temperature-fluorescence intensity calibration curve was used to correspond the fluorescence intensity value at each point of the fluorescence image to the temperature through numerical conversion to obtain the temperature of the spray droplet group. In summary, the present invention achieves the temperature measurement of the spray droplet group and the visualization of the spray morphology when the spray interacts with high-temperature flue gas.

Claims

1. A device for visualizing spray morphology and measuring droplet group temperature under high-temperature flue gas, characterized in that: It comprises a smoke dispersing device, the smoke dispersing device is connected to a sealed container (25), a spray device is arranged in the sealed container (25), and a laser induced fluorescence temperature measuring device acts on the spray device; The smoke dispersing device comprises a centrifugal fan (1), a heater (2), and a static pressure box (3) which are connected in sequence through an air supply duct (5); the static pressure box (3) is connected to a sealed container (25) through an inclined air supply port (4); The spray device comprises a siphon air atomizing nozzle (6), the siphon air atomizing nozzle (6) is located in a sealed container (25), one side of the siphon air atomizing nozzle (6) is connected to an air compressor (7) via an air supply pipe (8), and the other side of the siphon air atomizing nozzle (6) is connected to a water pump (12) via a water supply pipe (11), the water pump (12) is located in an organic glass container (23), and the organic glass container (23) is placed on a heatable magnetic stirrer (13); The siphon type air atomizing nozzle (6) is mounted on a fixed bracket (21); The air supply pipe (8) is provided with a pressure gauge (9); The water supply pipe (11) is provided with a flow meter (10); The laser-induced fluorescence temperature measuring device comprises a laser (16), the laser (16) is connected to a CCD camera (17), a filter (18) is installed at the lens of the CCD camera (17), and a synchronizer (19) is provided on the connection line between the laser (16) and the CCD camera (17).

2. The method for measuring the temperature of a spray droplet group of the device for visualizing the spray morphology and measuring the temperature of a droplet group under the action of high-temperature flue gas according to claim 1, characterized in that: The specific steps include: Step 1, prepare a fluorescent molecule aqueous solution (24) in a plexiglass container (23), use a heatable magnetic stirrer (13) to stir the fluorescent molecule aqueous solution (24) evenly and heat it, the temperature range of heating the fluorescent molecule aqueous solution (24) is 24° C. to 50° C. When the concentration of the fluorescent solution is constant, the fluorescence intensity and the temperature of the aqueous solution under the same laser intensity meet the following relationship, see formula (1): In the formula, I t is the fluorescence intensity, I j is the intensity of the excitation light, C is the concentration of the fluorescent solution, is the quantum efficiency, ε is the molar absorption coefficient, λ e / λ f is the ratio of the excitation light to the fluorescence wavelength; Step 2, collecting a fluorescence image of the fluorescent molecule aqueous solution after being excited by the laser (16) by a CCD camera (17); Step 3: Use MATLAB to obtain the fluorescence intensity data matrix of the fluorescence image at each temperature, and select the center column I of the matrix i The maximum value is the reference value I0, using Get the average error correction coefficient e at each temperature t , then use formula I y =e t I t Get the corrected fluorescence intensity value I of the fluorescence image corresponding to each temperature y ; Step 4, using a computer (20) to extract the corrected fluorescence intensity value from the image, normalizing the fluorescence intensity values ​​corresponding to different temperatures, and using formula (1) to obtain a calibration curve of temperature-fluorescence intensity of the fluorescent molecule aqueous solution; Step 5, starting the high-temperature smoke dispersing device and the spray device, using the fluorescent molecule aqueous solution (24) as a water source to form a spray, collecting the spray fluorescence image when the spray interacts with the high-temperature smoke, and realizing the visualization of the spray morphology; Step 6, using the established calibration curve of temperature-fluorescence intensity of the fluorescent molecule aqueous solution, the fluorescence intensity value in the spray fluorescence image is converted into a temperature value through a fluorescence image post-processing algorithm to obtain the temperature distribution of the spray droplet group.

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