Method for simultaneously monitoring particle sorting and bubble movement behaviors based on fluorescence tracing

Abstract

The invention discloses a method for simultaneously monitoring particle sorting and bubble movement behaviors based on fluorescence tracing. Comprising the following steps: placing heavy particles in a two-dimensional fluidized bed; putting a fluorescent particle after the fluidized bed starts fluidization; shooting the two-dimensional fluidized bed by using an image acquisition module, and capturing images of fluorescent particles and bubbles; an MATLAB image acquisition tool box is utilized to process image areas of shot pictures frame by frame, motion attributes of fluorescent particles and motion attributes of bubbles are obtained, the processed pictures are superposed and recombined into a new picture, and interaction of coal and bubbles in the gas-solid separation fluidized bed is researched. According to the invention, the interaction of particles and bubbles in the gas-solid separation fluidized bed is researched by utilizing a fluorescent tracing technology, so that the fine particle separation effect in the gas-solid separation fluidized bed is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coal sorting, and in particular to a method for simultaneously monitoring movement behaviors of sorting particles and bubbles based on fluorescence tracing. Background Art

[0002] The movement behavior of the sorted particles in the gas-solid sorting fluidized bed affects the fluidized dry sorting effect. Analyzing the movement behavior information of the sorted particles in the gas-solid sorting fluidized bed is of great significance for the efficient sorting of particles. The gas-solid sorting fluidized bed is a type of bubbling fluidized bed. During fluidization, the bubbles generated in the bed will also affect the movement behavior of the sorted particles, especially for fine particles.

[0003] The existing monitoring of the movement behavior of sorted particles and bubbles in the gas-solid separation fluidized bed is limited to tracking the sorted particles or bubbles separately, and there is no technology that can monitor the movement behavior of coal and bubbles at the same time. At the same time, there is a lack of methods to study the interaction between sorted particles and bubbles in the gas-solid separation fluidized bed. The research on the movement behavior of the particles and bubbles to be sorted is mostly in a separate study, and there is a lack of in-depth research and verification of the interaction between sorted particles and bubbles during the sorting process, resulting in poor sorting effect of gas-solid separation fluidized beds on fine particles. Summary of the invention

[0004] The purpose of the present invention is to provide a method for simultaneously monitoring the movement behavior of sorted particles and bubbles based on fluorescence tracing.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a method for simultaneously monitoring the movement behavior of sorted particles and bubbles based on fluorescence tracing, and the monitoring method comprises the following steps:

[0007] (1) placing weighted particles in a two-dimensional fluidized bed;

[0008] (2) introducing gas into the bottom of the two-dimensional fluidized bed, and the fluidized bed begins to fluidize;

[0009] (3) placing a fluorescent particle into a two-dimensional fluidized bed by free fall;

[0010] (4) photographing the two-dimensional fluidized bed using an image acquisition module to capture images of fluorescent particles and bubbles;

[0011] (5) The image area of ​​the photographed image was processed frame by frame using the MATLAB image acquisition toolbox to obtain the motion properties of the fluorescent particles and the bubbles. The processed images were superimposed and recombined into a new image to study the interaction between coal and bubbles in the gas-solid separation fluidized bed, including: the complete motion behavior of the fluorescent particles when they are not affected by the bubbles; the pushing, adsorption, and dragging effects of the bubbles on the fluorescent particles when the fluorescent particles are affected by the bubbles.

[0012] Furthermore, the fluorescent particles in step (1) are prepared by the following steps:

[0013] (1) Preparation of fluorescent composite material: 5-8 parts of fluorescent material and 2-3 parts of nano-metal material are mixed into anhydrous ethanol, ball-milled for 6-8 hours, and then filtered and dried to obtain a fluorescent composite material;

[0014] (2) Preparation of fluorescent epoxy emulsion: The fluorescent composite material obtained in step (1) is mixed with 40 parts of epoxy resin, the stirring temperature is 65-85°C, the reaction time is 2-3h, and then a small amount of concentrated sulfuric acid is added and continued to be stirred, the reaction temperature is 60-70°C, the reaction time is 2-3h, and 11-16 parts of moisturizer are added, and the heat is kept for reaction for 1-2h, and then 15-35 parts of epoxy resin are added again, the temperature is reduced to 50-60°C, the stirring is continued for 10-20min, the temperature is reduced to 35-45°C, 60-80 parts of dispersion medium are added, and high-speed dispersion is performed for 1-1.5h to obtain a fluorescent epoxy emulsion;

[0015] (3) Curing of the fluorescent epoxy emulsion: add 13-18 parts of curing agent to the fluorescent epoxy emulsion obtained in step (2), stir evenly and pour into a mold. The curing reaction temperature is 40-50° C.;

[0016] (4) Preparation of fluorescent particles: The fluorescent substance obtained in step (3) is peeled off from the mold to obtain fluorescent particles.

[0017] Furthermore, the fluorescent material structure contains one or more of hydroxyl or carboxyl groups; the wavelength of the fluorescent material is in the range of 400-600nm; the nanometal material is one or more of gold and zinc; the epoxy resin is one of epoxy resins E-44 and E-51; the humectant is a mixture of 1,2-propylene glycol and glycerol in a mass ratio of 1:6-2:5; the dispersion medium is one of deionized water and anhydrous ethanol; and the curing agent is 593 curing agent.

[0018] Furthermore, the moisturizing agent preparation method is to mix 1,2-propylene glycol and glycerol in proportion, and grind them in a mortar for 2-2.5 hours.

[0019] Furthermore, the motion properties of the fluorescent particles include: determining the position of the fluorescent particles based on the pixel side length and pixel position of the fluorescent point of the fluorescent particles; determining the speed and direction of the movement of the fluorescent particles based on the position changes of the fluorescent particles in adjacent frames; determining the trajectory and acceleration of the fluorescent particles based on the changes in the speed and direction of the movement of the fluorescent particles over time.

[0020] Furthermore, the pixel side length of the fluorescent particle fluorescent point is:

[0021]

[0022] Among them, l p is to represent the side length of the fluorescent point pixel, L represents the actual width of the captured video, and n represents the number of pixels corresponding to the actual width of the captured video.

[0023] Furthermore, the pixel position of the fluorescent particle is (x i ,y i ), where x i The absolute value of the number of horizontal pixels in the upper left corner of the i-th photo taken during the fluorescence point distance processing, y i Characterizes the absolute value of the number of vertical pixels in the upper left corner of the i-th photo taken during the fluorescence point distance processing.

[0024] Furthermore, the speed of movement of the fluorescent particles is:

[0025]

[0026] vi=vpi·lp

[0027] Among them, v pi is represented by the pixel rate of the fluorescent particles, t is represented by the time difference between the adjacent frames, and v i Characterized by the rate of movement of fluorescent particles.

[0028] Furthermore, the movement rate of the fluorescent particles is decomposed into a lateral rate and a longitudinal rate; the lateral rate of the fluorescent particles is: The longitudinal movement rate of the fluorescent particles is:

[0029]

[0030] Furthermore, the direction of movement of the fluorescent particles is (x i ,y i ) points to (x i+1 ,y i+1 ) direction.

[0031] Furthermore, the trajectory of the movement of the fluorescent particles is a line connecting the pixel positions of the fluorescent points of the fluorescent particles.

[0032] Furthermore, the acceleration of the fluorescent particle is decomposed into lateral acceleration and longitudinal acceleration, wherein the lateral acceleration is: The longitudinal acceleration is:

[0033] Furthermore, the motion properties of the bubbles include: determining the boundary conditions and positions of the bubbles based on the area range of pixels occupied by the bubbles frame by frame; determining the changes in the positions and sizes of the bubbles during their rising process based on the boundary conditions and positions of the bubbles frame by frame; and determining the motion properties of the bubbles based on the changes in the bubbles.

[0034] Furthermore, the boundary conditions and positions of the bubbles are determined by binarizing the bubbles, where the white areas are the bubbles, the boundaries of the white areas are the boundary conditions of the bubbles, and the centroid of the white areas is the position of the bubbles.

[0035] Furthermore, the changes in the position and size of the bubble during its rising process are obtained by processing adjacent frame photos, thereby obtaining the movement properties of the bubble.

[0036] Furthermore, the image acquisition module includes an ultraviolet lamp, a white curtain and a camera, the ultraviolet lamp and the white curtain are respectively placed on both sides of the two-dimensional fluidized bed, the ultraviolet lamp is used to irradiate the two-dimensional fluidized bed to make the fluorescent particles emit fluorescence and enhance the contrast between the bubbles and the fluidized medium, the white curtain is used to further enhance the contrast between the bubbles and the fluidized medium, the camera and the ultraviolet lamp are located on the same side, and the camera is at the same height as the two-dimensional fluidized bed, and the camera is electrically connected to the computer.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention uses fluorescent tracing technology to replace sorting particles with fluorescent particles. The excited fluorescent particles are significantly different from the weighted particles, which can significantly reduce the spatial and temporal resolution during observation and achieve tracking of the movement behavior of fluorescent particles;

[0039] 2. Under the irradiation of ultraviolet light, the camera can track the movement of bubbles while tracking fluorescent particles.

[0040] 3. Based on the coupling of the above-mentioned fluorescent particle movement behavior and bubble movement behavior, the interaction between particles and bubbles in the gas-solid separation fluidized bed can be studied, thereby solving the problem of poor fine particle separation effect in the gas-solid separation fluidized bed. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The fluorescence test of the fluorescent particles prepared in Example 1 and Comparative Examples 1 to 3 is shown.

[0042] Figure 2 A schematic structural diagram of a method system for studying the movement behavior of sorted particles in a gas-solid sorting fluidized bed based on a fluorescent tracer method provided in an embodiment of the present invention.

[0043] Figure 3(a) shows the superficial gas velocity u in the fluidized bed, which is the minimum fluidizing gas velocity u mf Movement trajectory of fluorescent particles when the value is 1.5 times larger.

[0044] Figure 3(b) shows the superficial gas velocity u in the fluidized bed, which is the minimum fluidizing gas velocity u mf Movement trajectory of fluorescent particles when the value is twice as large.

[0045] Figure 4 Schematic diagram of the movement of bubbles in a fluidized bed.

[0046] In the figure: 1-blower; 2-air tank; 3-pressure gauge; 4-butterfly valve; 5-mass flow meter; 6-white curtain; 7-two-dimensional fluidized bed; 8-pressure sensor; 9-ultraviolet lamp; 10-camera; 11-computer; 12-fluorescent particles. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] The existing monitoring of the movement behavior of sorted particles and bubbles in the gas-solid separation fluidized bed is limited to tracking the sorted particles or bubbles separately, and there is no technology that can monitor the movement behavior of coal and bubbles at the same time. At the same time, there is a lack of methods to study the interaction between sorted particles and bubbles in the gas-solid separation fluidized bed. The research on the movement behavior of the particles and bubbles to be sorted is mostly in a separate study, and there is a lack of in-depth research and verification of the interaction between sorted particles and bubbles during the sorting process, resulting in poor sorting effect of gas-solid separation fluidized beds on fine particles.

[0049] In order to further study and verify the interaction between sorting particles and bubbles, the present application provides a method based on fluorescent particles instead of particles to study the interaction between particles and bubbles in a gas-solid sorting fluidized bed, thereby solving the problem of poor fine particle sorting effect in a gas-solid sorting fluidized bed.

[0050] The present invention provides a fluorescent particle, and the specific preparation process is as follows.

[0051] Comparative Example 1

[0052] (1) Preparation of fluorescent material: 8 parts of fluorescein were mixed into anhydrous ethanol, and then placed in a high-energy ball mill for 7 hours at a speed of 480 rpm, and then filtered and dried to obtain the fluorescent material; (2) Preparation of fluorescent epoxy emulsion: The fluorescent material obtained in step (1) and 40 parts of epoxy resin E-44 were mixed and stirred using a constant temperature magnetic stirrer at a stirring temperature of 85°C and a reaction time of 6 hours, and then 30 parts of epoxy resin E-44 were added, the temperature was lowered to 60°C, and stirring was continued for 20 minutes, the temperature was lowered to 45°C, 80 parts of anhydrous ethanol were added, and high-speed dispersion was performed for 1.5 hours to obtain the fluorescent epoxy emulsion; (3) Curing of fluorescent epoxy emulsion: 17 parts of 593 curing agent were added to the fluorescent epoxy emulsion obtained in step (2), and then stirred for 10 minutes, and poured into a mold. The curing reaction temperature was 50°C; (4) Preparation of fluorescent particles: The fluorescent substance obtained in step (3) was peeled off from the mold to obtain fluorescent particles.

[0053] Comparative Example 2

[0054] (1) Preparation of fluorescent material: 8 parts of fluorescein were mixed into anhydrous ethanol, and then placed in a high-energy ball mill for 7 hours at a speed of 480 rpm, and then filtered and dried to obtain a fluorescent material; (2) Preparation of fluorescent epoxy emulsion: The fluorescent material obtained in step (1) and 40 parts of epoxy resin E-44 were mixed and stirred using a constant temperature magnetic stirrer at a stirring temperature of 85°C and a reaction time of 3 hours, and then 2 parts of concentrated sulfuric acid were added at a reaction temperature of 70°C and a reaction time of 3 hours, and then added 30 parts of epoxy resin, cool to 60°C, continue stirring for 20 minutes, cool to 45°C, add 80 parts of anhydrous ethanol, and disperse at high speed for 1.5 hours to obtain fluorescent epoxy emulsion; (3) Curing of fluorescent epoxy emulsion: add 17 parts of 593 curing agent to the fluorescent epoxy emulsion obtained in step (2), then stir for 10 minutes, pour into a mold, and the curing reaction temperature is 50°C; (4) Preparation of fluorescent particles: peel the fluorescent substance obtained in step (3) from the mold to obtain fluorescent particles.

[0055] Comparative Example 3

[0056] (1) Preparation of fluorescent composite material: 5 parts of fluorescein and 3 parts of nano zinc powder were mixed into anhydrous ethanol, and then placed in a high-energy ball mill for 7 hours at a speed of 480 rpm, and then filtered and dried to obtain a fluorescent composite material; (2) Preparation of fluorescent epoxy emulsion: The fluorescent composite material obtained in step (1) and 40 parts of epoxy resin E-44 were mixed and stirred using a constant temperature magnetic stirrer at a stirring temperature of 85°C and a reaction time of 3 hours, and then 2 parts of concentrated sulfuric acid were added at a reaction temperature of 70°C and a reaction time of 3 hours. , then add 30 parts of epoxy resin, cool to 60°C, continue stirring for 20 minutes, cool to 45°C, add 80 parts of anhydrous ethanol, and disperse at high speed for 1.5 hours to obtain a fluorescent epoxy emulsion; (3) Curing of the fluorescent epoxy emulsion: add 17 parts of 593 curing agent to the fluorescent epoxy emulsion obtained in step (2), then stir for 10 minutes, pour into a mold, and the curing reaction temperature is 50°C; (4) Preparation of fluorescent particles: peel the fluorescent substance obtained in step (3) from the mold to obtain fluorescent particles.

[0057] Example 1

[0058] (1) Preparation of fluorescent composite material: 5 parts of fluorescein and 3 parts of nano zinc powder were mixed into anhydrous ethanol, and then placed in a high-energy ball mill for 7 hours at a speed of 480 rpm, and then filtered and dried to obtain a fluorescent composite material; (2) Preparation of fluorescent epoxy emulsion: The fluorescent composite material obtained in step (1) and 40 parts of epoxy resin E-44 were mixed and stirred using a constant temperature magnetic stirrer at a stirring temperature of 85°C and a reaction time of 3 hours, and then 2 parts of concentrated sulfuric acid were added at a reaction temperature of 70°C and a reaction time of 3 hours, and 15 parts of a moisturizer were added, and the moisturizer was 1,2-propylene glycol and A mixture with a mass ratio of propylene glycol of 2:5 is heated for reaction for 1-2 hours, then 30 parts of epoxy resin are added, the temperature is lowered to 60°C, stirring is continued for 20 minutes, the temperature is lowered to 45°C, 45 parts of anhydrous ethanol are added, and high-speed dispersion is performed for 1.5 hours to obtain a fluorescent epoxy emulsion; (3) Curing of the fluorescent epoxy emulsion: 17 parts of 593 curing agent are added to the fluorescent epoxy emulsion obtained in step (2), and then stirred for 10 minutes, poured into a mold, and the curing reaction temperature is 50°C; (4) Preparation of fluorescent particles: The fluorescent substance obtained in step (3) is peeled off from the mold to obtain fluorescent particles.

[0059] Test example: Fluorescence test

[0060] The fluorescence intensity is measured by a fluorescence spectrophotometer. Specifically, after the laser is irradiated to the particles, the particles reflect and the intensity of the reflected light is used to obtain the fluorescence intensity. The test results are as follows: Figure 1 From the test results, it can be seen that the use of Example 1, that is, the preparation method of the present invention, can effectively improve the fluorescence intensity of the fluorescent particles. Therefore, the particles prepared in Example 1 are used as a fluorescent tracer technology in the fluidized bed sorting particle movement behavior detection method.

[0061] The present invention provides a method for monitoring the movement behavior of fluidized bed sorting particles based on fluorescent tracing technology, using a two-dimensional fluidized bed image acquisition and processing system, such as Figure 2 As shown, the system includes: an air outlet device, a two-dimensional fluidized bed 7, an image acquisition module, and an image processing module.

[0062] Specifically, the air outlet equipment includes: a blower 1, a gas tank 2, a pressure gauge 3, a butterfly valve 4, and a mass flow meter 5; the gas tank 2 is used to store the gas generated by the blower 1, the pressure gauge 3 is used to monitor the gas pressure in the gas tank 2, the mass flow meter 5 is used to monitor the air flow rate, and the butterfly valve 4 is used to control the gas delivery and adjust the air flow rate.

[0063] The image acquisition module includes: an ultraviolet lamp 9, a white curtain 6, a camera 10, and a tripod; the ultraviolet lamp 9 and the white curtain 6 are respectively placed on both sides of the two-dimensional fluidized bed 7, and the ultraviolet lamp 9 is used to make the fluorescent particles emit fluorescence and enhance the contrast between the bubbles and the fluidized medium. The white curtain 6 is used to further enhance the contrast between the bubbles and the fluidized medium. The tripod 10 and the ultraviolet lamp 9 are located on the same side of the two-dimensional fluidized bed 7, and are used to support the camera 10 so that it is consistent with the height of the two-dimensional fluidized bed 7.

[0064] The image processing module comprises: a computer 11 , and the camera 10 is electrically connected to the computer 11 .

[0065] During fluidization, the butterfly valve 4 is opened to transport the gas in the gas tank 2 to the bottom of the two-dimensional fluidized bed 7, and the camera 10 is turned on to shoot the two-dimensional fluidized bed 7 to capture the fluorescent particles and bubbles therein. The properties of the image area are measured using the image acquisition toolbox in MATLAB. The motion properties of the fluorescent particles and bubbles in the captured images are processed frame by frame, and the processed images are superimposed and recombined into a new image to study the interaction between coal and bubbles in the gas-solid separation fluidized bed.

[0066] In the present application example, the pixel position of the fluorescent particle is (x i ,y i );

[0067] The pixel side length is:

[0068] Among them, lp represents the pixel side length, L represents the actual width of the captured video, and n represents the number of pixels corresponding to the actual width of the captured video.

[0069] The speed of the fluorescent particle movement is:

[0070]

[0071] yi.=pi p

[0072] Where vpi is the pixel rate of the fluorescent particles, t is the time difference between the adjacent frames, and v i Characterized by the rate of movement of fluorescent particles.

[0073] The movement rate of the fluorescent particles can be decomposed into lateral rate and longitudinal rate.

[0074] The lateral velocity of the fluorescent particle is:

[0075] The longitudinal movement rate of the fluorescent particles is:

[0076] The direction of the movement of the fluorescent particles is (x i ,y i ) points to (x i+1 ,y i+1 ) direction.

[0077] The trajectory of the fluorescent particle movement is the line connecting the pixel positions of the fluorescent points of the fluorescent particles.

[0078] The acceleration of the fluorescent particle can be decomposed into lateral acceleration and longitudinal acceleration.

[0079] The lateral acceleration is:

[0080] The longitudinal acceleration is:

[0081] Example 1:

[0082] During fluidization, the butterfly valve 4 is opened to transport the gas in the gas tank 2 to the bottom of the two-dimensional fluidized bed 7, and the superficial gas velocity u in the fluidized bed is controlled to be the minimum fluidization gas velocity u mf 1.5 times (u=1.5u mf ), turn on the camera 10, shoot the two-dimensional fluidized bed 7, and when the fluidization is stable, put the fluorescent particles 12 in a free-falling motion, and the camera 10 captures the fluorescent particles 12 and bubbles therein. Use the image acquisition toolbox in MATLAB to measure the properties of the image area. Use the motion properties of the fluorescent particles and bubbles in the captured images frame by frame, overlay and recompose the processed images into a new image, and study the interaction between coal and bubbles in the gas-solid separation fluidized bed. The minimum fluidizing gas velocity u mf Measured by pressure sensor 8.

[0083] Example 2:

[0084] During fluidization, the butterfly valve 4 is opened to transport the gas in the gas tank 2 to the bottom of the two-dimensional fluidized bed 7, and the superficial gas velocity u in the fluidized bed is controlled to be the minimum fluidization gas velocity u mf 2 times (u=2.0umf ), turn on the camera 10, shoot the two-dimensional fluidized bed 7, and when the fluidization is stable, put the fluorescent particles 12 in a free-falling motion, and the camera 10 captures the fluorescent particles 12 and bubbles therein. Use the image acquisition toolbox in MATLAB to measure the properties of the image area. Use the motion properties of the fluorescent particles and bubbles in the captured images frame by frame, overlay and recompose the processed images into a new image, and study the interaction between coal and bubbles in the gas-solid separation fluidized bed. The minimum fluidizing gas velocity u mf Measured by pressure sensor 8.

[0085] Specifically, the position, movement speed and acceleration of the fluorescent particles are shown in Tables 1 and 2.

[0086] Table 1 Position, velocity and acceleration of fluorescent particles (u = 1.5 u mf )

[0087]

[0088] Table 2 Position, velocity and acceleration of fluorescent particles (u = 2.0 u mf )

[0089]

[0090] The motion trajectory of the fluorescent particles is shown in Figure 3. It can be seen that the particles mainly vibrate on the bed.

[0091] The motion properties of the bubbles include: determining the boundary conditions and positions of the bubbles based on the area range of pixels occupied by the bubbles frame by frame; determining the changes in the positions and sizes of the bubbles during their rise based on the boundary conditions and positions of the bubbles frame by frame; and determining the motion properties of the bubbles based on the changes in the bubbles.

[0092] The boundary conditions and positions of the bubbles are determined by binarizing the bubbles, where the white area is the bubble, the boundary of the white area is the boundary condition of the bubble, and the centroid of the white area is the position of the bubble.

[0093] The changes in the position and size of the bubble during its rising process are obtained by processing adjacent frame photos, thereby obtaining the movement properties of the bubble.

[0094] The movement of bubbles is Figure 4 shown.

[0095] By processing the motion properties of particles and bubbles in the photos taken frame by frame, the processed pictures are superimposed and recombined into a new picture to study the interaction between coal and bubbles in the gas-solid separation fluidized bed. Specifically, the interaction between bubbles and particles includes: the complete motion behavior of fluorescent particles without being affected by bubbles; the pushing, adsorption and dragging effects of bubbles on fluorescent particles when fluorescent particles are affected by bubbles.

[0096] The interaction between coal and bubbles in the gas-solid separation fluidized bed will affect the separation effect to varying degrees. Under different conditions, such as the size of fluorescent particles, the density of fluorescent particles, different aspect ratios of the fluidized bed, and different superficial velocities of the fluidized bed, the separation effect will be different.

[0097] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A method for simultaneously monitoring the movement of sorted particles and bubbles based on fluorescence tracing, characterized in that: The following steps are involved: (1) placing weighted particles in a two-dimensional fluidized bed; (2) introducing gas into the bottom of the two-dimensional fluidized bed, and the fluidized bed begins to fluidize; (3) placing a fluorescent particle into a two-dimensional fluidized bed by free fall; (4) photographing the two-dimensional fluidized bed using an image acquisition module to capture images of fluorescent particles and bubbles; (5) The image area of ​​the photographed image was processed frame by frame using the MATLAB image acquisition toolbox to obtain the motion properties of the fluorescent particles and the bubbles. The processed images were superimposed and recombined into a new image to study the interaction between coal and bubbles in the gas-solid separation fluidized bed, including: the fluorescent particles were not affected by the bubbles, and the complete motion behavior of the fluorescent particles; The fluorescent particles are affected by the bubbles, which push, adsorb and drag the fluorescent particles.

2. The method for simultaneously monitoring the movement behavior of sorted particles and bubbles based on fluorescence tracing according to claim 1, characterized in that: The fluorescent particles in step (1) are prepared by the following steps: (1) Preparation of fluorescent composite material: 5-8 parts of fluorescent material and 2-3 parts of nano-metal material are mixed into anhydrous ethanol, ball-milled for 6-8 hours, and then filtered and dried to obtain a fluorescent composite material; (2) Preparation of fluorescent epoxy emulsion: The fluorescent composite material obtained in step (1) is mixed with 40 parts of epoxy resin, the stirring temperature is 65-85°C, the reaction time is 2-3h, and then a small amount of concentrated sulfuric acid is added and continued to be stirred, the reaction temperature is 60-70°C, the reaction time is 2-3h, and 11-16 parts of moisturizer are added, and the heat is kept for reaction for 1-2h, and then 15-35 parts of epoxy resin are added again, the temperature is reduced to 50-60°C, the stirring is continued for 10-20min, the temperature is reduced to 35-45°C, 60-80 parts of dispersion medium are added, and high-speed dispersion is performed for 1-1.5h to obtain a fluorescent epoxy emulsion; (3) Curing of the fluorescent epoxy emulsion: add 13-18 parts of curing agent to the fluorescent epoxy emulsion obtained in step (2), stir evenly and pour into a mold. The curing reaction temperature is 40-50° C.; (4) Preparation of fluorescent particles: The fluorescent substance obtained in step (3) is peeled off from the mold to obtain fluorescent particles.

3. The method for simultaneously monitoring the movement behavior of sorted particles and bubbles based on fluorescence tracing according to claim 2, characterized in that: The fluorescent material structure contains one or more of hydroxyl or carboxyl groups; the wavelength of the fluorescent material is within the range of 400-600nm; the nanometal material is one or more of gold and zinc; the epoxy resin is one of epoxy resins E-44 and E-51; the humectant is a mixture of 1,2-propylene glycol and glycerol in a mass ratio of 1:6-2:5; the dispersion medium is one of deionized water and anhydrous ethanol; and the curing agent is 593 curing agent.

4. The method for simultaneously monitoring the movement of sorted particles and bubbles based on fluorescence tracing according to claim 2, characterized in that: The preparation method of the moisturizer comprises the following steps: mixing 1,2-propylene glycol and glycerol in proportion, and grinding the mixture in a mortar for 2-2.5 hours.

5. The method for simultaneously monitoring the movement of sorted particles and bubbles based on fluorescence tracing according to claim 1, characterized in that: The motion properties of the fluorescent particles include: determining the position of the fluorescent particles according to the pixel side length and pixel position of the fluorescent point of the fluorescent particles; determining the speed and direction of the movement of the fluorescent particles according to the position changes of the fluorescent particles in adjacent frames; and determining the trajectory and acceleration of the fluorescent particles according to the changes in the speed and direction of the fluorescent particles' movement over time.

6. The method for simultaneously monitoring the movement of sorted particles and bubbles based on fluorescence tracing according to claim 1, characterized in that: The motion properties of the bubbles include: determining the boundary conditions and positions of the bubbles based on the area range of pixels occupied by the bubbles frame by frame; determining the changes in the positions and sizes of the bubbles during their rise based on the boundary conditions and positions of the bubbles frame by frame; and determining the motion properties of the bubbles based on the changes in the bubbles.

7. The method for simultaneously monitoring the movement of sorted particles and bubbles based on fluorescence tracing according to claim 1, characterized in that: The image acquisition module includes an ultraviolet lamp, a white curtain and a camera. The ultraviolet lamp and the white curtain are respectively placed on both sides of the two-dimensional fluidized bed. The ultraviolet lamp is used to irradiate the two-dimensional fluidized bed to make the fluorescent particles emit fluorescence and enhance the contrast between the bubbles and the fluidized medium. The white curtain is used to further enhance the contrast between the bubbles and the fluidized medium. The camera and the ultraviolet lamp are located on the same side, and the camera is at the same height as the two-dimensional fluidized bed. The camera is electrically connected to a computer.

Images