CN110679992B - System and method for measuring dispersion characteristic of tobacco powder spraying - Google Patents
System and method for measuring dispersion characteristic of tobacco powder spraying Download PDFInfo
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Abstract
The invention relates to a system and a method for measuring the dispersion characteristic of tobacco powder spraying, comprising a tobacco powder spraying system, a detection system and a tobacco powder recovery system. The technical scheme provides a detection system capable of inspecting the dispersion characteristic of the tobacco powder spraying process aiming at the process requirements of the existing paper-making reconstituted tobacco industry, and the detection system can be generally divided into a tobacco powder spraying system, a detection system and a tobacco powder recycling and exhausting system. The detection system comprises an organic glass dispersion chamber, a microscopic detection platform, a macroscopic detection platform and a data acquisition system; the macroscopic detection platform can obtain the dispersion information of the whole flow field profile, including the dispersion angle and the penetration distance, and the microscopic detection platform can obtain the time average particle distribution diagram of the time average flow field velocity and the time average particle distribution diagram of the concentration average distribution of the local flow field.
Description
Technical Field
The invention belongs to the field of paper-making reconstituted tobacco, particularly relates to a measuring system and a measuring method for detecting dispersion indexes and ensuring the quality of reconstituted tobacco products, and aims to examine the dispersion characteristics of tobacco powder in the process of spraying the tobacco powder to a paper-making reconstituted tobacco substrate.
Background
The paper-making reconstituted tobacco is one of tobacco raw materials in a cigarette formula, has the characteristics of strong controllability, high filling value, low tar release amount and the like, and is widely applied to Chinese cigarettes and novel tobacco products. In the preparation process of the paper-making reconstituted tobacco, the residual useful tobacco aroma components and tobacco powder (powder) are lost in the subsequent long-time processing process, so that the reconstituted tobacco has poor sensory quality, flat tobacco aroma and obvious miscellaneous gas. Therefore, how to efficiently retain the fragrant substances and prevent the fragrant substance structure from being damaged, effectively improve the quality of reconstituted tobacco products, and realize the full and reasonable utilization of waste tobacco raw materials is a problem which needs to be solved urgently in the industry.
The method is an effective product quality improvement process by adding the tobacco powder into the reconstituted tobacco through a gas-solid two-phase flow nozzle, and as the formula and process indexes of different reconstituted tobacco products are different, process condition parameters need to be changed continuously in the spraying process, the dispersion characteristics of the tobacco powder in the spraying process under different working conditions can be changed obviously, and the final substrate quality is influenced.
The dispersion area formed by the gas-solid two-phase flow nozzle is generally a cone formed by smoke powder particles, the dispersion characteristics of the cone comprise macroscopic characteristics and microscopic characteristics, the macroscopic characteristics mainly comprise shape characteristics of dispersion profiles, namely dispersion angles and penetration distances, the microscopic characteristics mainly comprise concentration distribution, velocity distribution and the like of the smoke powder particles, the concentration distribution of the smoke powder directly influences the uniformity of the smoke powder in the substrate, the velocity distribution influences the binding force condition of the smoke powder to the substrate, and the dispersion angles and the penetration distances influence the effective utilization space and the utilization rate of the smoke powder.
Therefore, the design of a measuring system capable of detecting the dispersion angle, the penetration distance, the particle concentration distribution and the velocity distribution of the tobacco powder dispersion area can reasonably adjust the technological condition parameters, and is very important for stably controlling the quality of the reconstituted tobacco product.
Disclosure of Invention
The invention aims to provide a system and a method for measuring the dispersion characteristic of tobacco powder spraying, which aim to solve the problem that macro-surface and micro-surface detection cannot be performed on the tobacco powder in the process of spraying the tobacco powder rapidly in the prior art.
The invention is realized by the following technical scheme:
a system for measuring the dispersion characteristics of a soot spray, comprising: a tobacco powder spraying system and a detection system;
the tobacco powder spraying system comprises:
the side wall of the storage bin is respectively provided with a feeding hole, a fluidized air inlet and a discharging hole; a stirring device is arranged in the storage bin, an air distribution chamber is arranged at the inner lower part of the storage bin, and the fluidized air inlet is communicated with the air distribution chamber;
the dispersion chamber is internally provided with a scale at the bottom, and the side wall of the dispersion chamber is provided with a dispersion chamber inlet and a dispersion chamber outlet;
one end of the solid conveying pipeline is provided with an outflow nozzle, the outflow nozzle is connected with the dispersion chamber inlet, and the other end of the outflow nozzle is connected with the feed opening;
the air supply system is respectively connected with the pressurizing air pipeline, the fluidizing air pipeline, the supplementary air pipeline and the central air pipeline;
the pressurizing air pipeline is connected with the pressurizing air inlet, the fluidizing air pipeline is connected with the fluidizing air inlet, the supplementary air pipeline is connected with the material outlet end of the solid conveying pipeline, and the central air pipeline is connected with the outward-flowing nozzle;
the detection system comprises:
a macroscopic detection platform, a microscopic detection platform and a data acquisition system;
the macroscopic detection platform comprises a high-speed camera, a lens of the high-speed camera is opposite to the diffusion chamber, and the high-speed camera is in electric signal connection with the data acquisition system;
the microscopic detection platform comprises a double-pulse laser, and a sheet light source emitted by the double-pulse laser is superposed with the section of the axis of a jet area formed in the dispersion chamber by the outflow nozzle;
the lens of the CCD camera vertically passes through the sheet light source of the injection area;
and the synchronizer is respectively connected with the double-pulse laser, the CCD camera and the data acquisition system.
The air supply system comprises an air compressor, a freeze dryer and a pressure buffer tank which are connected in sequence, wherein a ball valve is arranged on a pipeline of the freeze dryer and the buffer tank.
And a differential pressure sensor is arranged outside the storage bin.
The outflow type nozzle is a gas-solid two-phase flow nozzle, a central channel of the outflow type nozzle is communicated with the central air pipeline, and an outer ring channel of the outflow type nozzle is communicated with the solid conveying pipeline.
The shooting speed of the high-speed camera is 1000 frames/s, and the exposure time is 4x10-5s, picture resolution is 512x 1024.
The double-pulse laser is an yttrium aluminum garnet crystal laser, each excited laser is far infrared light with the wavelength of 1064nm, the energy of each pulse is 135mJ, the pulse interval is adjustable, and the far infrared laser is subjected to frequency doubling through an internal secondary harmonic generator and is changed into green light with the wavelength of 532 nm.
The CCD camera has image resolution of 1600x2000 pixels and exposure time of 4x10-5s, the shooting speed is 32 frames/s.
Still include the tobacco powder recovery system, include:
an inlet of the induced draft fan is connected with an outlet of the dispersion chamber through a pipeline,
an inlet of the cyclone separator is connected with an outlet of the induced draft fan through a pipeline, and a tobacco powder outlet of the cyclone separator is connected with the feed inlet through a pipeline;
the inlet of the dust remover is connected with the cyclone separator, the gas outlet is connected with the exhaust fan, and the dust outlet is connected with the feed inlet through a pipeline.
A method of measuring the dispersion characteristics of a soot spray using the measurement system of any one of the above, comprising the steps of:
1) pressurized air enters the upper part of the storage bin through a pressurized air pipeline, fluidized air enters an air distribution chamber at the bottom of the storage bin through a fluidized air pipeline, and the tobacco powder entering the storage bin is uniformly fluidized through an air distribution plate;
2) the tobacco powder which is fluidized uniformly is pushed by the pressure difference in the storage bin and enters the solid conveying pipeline through the feed opening, and meanwhile, the supplementary air is mixed with the tobacco powder in the solid conveying pipeline through the supplementary air pipeline and part of the fluidized air to form mixed air flow, and then the mixed air flow enters the outer ring channel of the outward flow type nozzle;
the central air enters the central channel of the outward flow type nozzle through the central air pipeline, is mixed with the mixed air flow at the outlet of the outward flow type nozzle, and is sprayed into the dispersion chamber;
3) the high-speed camera shoots a static picture of a particle flow field entering a dispersion chamber, and transmits the static picture to the data acquisition system, and the data acquisition system acquires a dispersion angle according to the static picture;
meanwhile, the penetration distance of the particle flow field is directly read through a ruler in the dispersion chamber;
4) the double-pulse laser emits two beams of laser with the time interval delta t and forms a sheet light source passing through the axis of the outflow nozzle;
the CCD camera shoots two particle flow field pictures with delta t time under the control of the synchronizer;
5) transferring the particle flow field picture to a data acquisition system, processing to obtain the displacement of the same particle at the time of difference delta t, simultaneously obtaining the movement speed of the particle, and obtaining time average flow field speed data and a time average flow field speed distribution diagram at corresponding time through continuous shooting for multiple times;
6) the data acquisition system simultaneously carries out superposition processing on the particle flow field pictures shot at different moments to obtain a time-average particle distribution diagram;
7) moving a CCD camera, and shooting the particle flow field in different regions for multiple times to obtain a time average flow field velocity distribution diagram and a time average particle distribution diagram of different particle flow field regions;
8) the smoke powder and the gas in the dispersion chamber are pumped out by a draught fan and sequentially enter a cyclone separator and a dust remover, the smoke powder enters a storage bin again, and the gas is led out by an exhaust fan.
The static picture is processed by changing contrast and brightness contrast of a brightness enhanced graph, repairing stains, then carrying out sharpening, filtering and edge detection processing, directly generating tangent straight lines and measuring an angle formed by the two tangent lines, namely a dispersion angle; the dispersion angles obtained by analyzing a plurality of taken static pictures are averaged to obtain an average dispersion angle.
The invention has the beneficial effects that:
the shooting through the macroscopic detection platform is convenient, the effectiveness is high, the experiment cost is low, the overall morphological characteristics of the flow field can be mastered, the microscopic detection platform can obtain local specific particle flow information, the data information quantity is large, the comprehensive investigation of the macroscopic detection platform and the microscopic detection platform is helpful for comprehensively understanding the particle dispersion characteristics in the tobacco powder spraying and conveying process, and the method has important significance for guiding and adjusting the working condition and stabilizing the quality of the reconstituted tobacco leaves by the papermaking method.
Drawings
FIG. 1 is a schematic view of a system for detecting the macroscopic dispersion characteristics of the soot spray;
FIG. 2 is a schematic view of a microscopic detection platform for the soot spraying.
Description of the reference numerals
1-an air compressor, 2-a freeze dryer, 3-a pressure buffer tank, 4-a gear speed reduction motor, 5-a stirrer, 6-a feed inlet, 7-a storage bin, 8-an air distribution chamber, 9-an outflow nozzle, 10-an organic glass dispersion chamber, 11-a scale, 12-a high-speed camera, 13-a computer, 14-an induced draft fan, 15-a cyclone separator, 16-a dust remover, 17-a ball valve, 18-a pressure regulating valve, 19-a flow controller, 20-a differential pressure sensor, 21-a pressurizing air pipeline, 22-a fluidizing air pipeline, 23-a supplementary air pipeline, 24-a central air pipeline, 25-a solid conveying pipeline, 26-a laser power supply and cooling water system, 27-a double pulse laser and 28-a light source lens group, 29-sheet light source, 30-particle flow field profile, 31-CCD camera, 32-synchronizer.
Detailed Description
The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.
The technical scheme provides a detection system capable of inspecting the dispersion characteristic of the tobacco powder spraying process aiming at the process requirements of the existing paper-making reconstituted tobacco industry, and the detection system can be generally divided into a tobacco powder spraying system, a detection system and a tobacco powder recycling and exhausting system. The detection system comprises an organic glass dispersion chamber, a microscopic detection platform, a macroscopic detection platform and a data acquisition system; the macroscopic detection platform can obtain the dispersion information of the whole flow field profile, including the dispersion angle and the penetration distance, and the microscopic detection platform can obtain the time average particle distribution diagram of the time average flow field velocity and the time average particle distribution diagram of the concentration average distribution of the local flow field.
As shown in fig. 1, the present application provides a system for measuring dispersion characteristics of a soot spray, comprising:
the feed bin is a bottom fluidization side discharging type feed bin with an upper barrel and a lower cone, a low-speed stirring device is arranged right above the feed bin, a stirrer is arranged in the feed bin, a stirring motor and a gear reducer are arranged right above the outside of the feed bin, a feed inlet and a pressure air inlet are respectively arranged on the upper side wall of the feed bin, a fluidization air inlet and a feed outlet are respectively arranged on the lower side wall of the feed bin, an air distribution chamber separated by a plate distribution plate is arranged at the bottom inside the feed bin, and the fluidization air inlet is communicated with the air distribution chamber.
The dispersion room is organic glass dispersion room in this application, and the detecting system work of being convenient for, and the indoor bottom of dispersion is provided with the scale, be provided with dispersion room import and dispersion room export on the lateral wall of dispersion room. The organic glass dispersion chamber limits the dispersion area within a certain space range on the premise of not influencing the flow field, can clearly observe the indoor dispersion condition, can also carry out relevant operation according to the condition, can also effectively prevent the environment from being polluted by the overflow of experimental materials, and can collect materials for recycling.
And one end of the solid conveying pipeline is provided with an outflow nozzle, the outflow nozzle is connected with the inlet of the dispersion chamber, and the other end of the solid conveying pipeline is connected with the feed opening. The outflow nozzle is a gas-solid two-phase flow nozzle, the central channel of the outflow nozzle is communicated with the central air pipeline, and the outer ring channel of the outflow nozzle is communicated with the solid conveying pipeline.
Air feed system, air feed system connects the air compressor machine, freeze dryer and the pressure buffer tank that pressurize wind pipeline, fluidization wind pipeline, supplementary wind pipeline and central wind pipeline respectively, the air feed system of this application for connect gradually freeze dryer with be provided with the ball valve on the pipeline of buffer tank, all be provided with the control valve at pressurization wind pipeline, fluidization wind pipeline, supplementary wind pipeline and central wind pipeline for the adjustment of the amount of wind.
The pressurizing air pipeline is connected with the pressurizing air inlet, the fluidizing air pipeline is connected with the fluidizing air inlet, the supplementary air pipeline is connected with the end, close to the discharge port, of the solid conveying pipeline, and the central air pipeline is connected with the outward-flowing nozzle.
The detection system comprises:
a macroscopic detection platform, a microscopic detection platform and a data acquisition system;
the macroscopic detection platform comprises a high-speed camera, a lens of the high-speed camera is opposite to the diffusion chamber, and the high-speed camera is in electric signal connection with the data acquisition system; the shooting speed of the high-speed camera is 1000 frames/s, and the exposure time is 4x10-5s, the picture resolution is 512x1024, and the actual shooting area size is 10cm x20 cm.
As shown in fig. 2, the microscopic detection platform comprises a laser power supply and cooling water system, a double-pulse laser, a lens set of a sheet light source, a CCD camera and a synchronizer; the laser power supply provides energy required by the laser generator according to a certain frequency and supplies power for circulating cooling water;
the microscopic detection platform comprises a double-pulse laser, and a sheet light source emitted by the double-pulse laser is superposed with the section of the axis of a jet area formed in the dispersion chamber by the outflow nozzle; the cooling water device provides the cooling function to the system, prevents that laser generator is overheated.
The double-pulse laser is Nd-YAG (yttrium aluminum garnet crystal) laser, each excited laser is far infrared light with the wavelength of 1064nm, the energy of each pulse is 135mJ, the pulse interval is adjustable, and the far infrared laser is subjected to frequency doubling by an internal secondary harmonic generator and is changed into green light with the wavelength of 532 nm.
The lens of the CCD camera vertically passes through the sheet light source of the injection area; image resolution of 1600x2000 pixels for a CCD camera with exposure time of 4x10-5s, the shooting speed is 32 frames/s, and the size of the actual shooting area is 9cm x 12 cm.
The synchronizer is respectively connected with the double-pulse laser, the CCD camera and the data acquisition system, the synchronizer can coordinate the laser and the camera, and the resolution ratio is 1 ns.
The data acquisition system comprises a computer and attached image J and origin 3G software.
Still include the tobacco powder recovery system, include:
and the inlet of the induced draft fan is connected with the outlet of the dispersion chamber through a pipeline.
And the inlet of the cyclone separator is connected with the outlet of the induced draft fan through a pipeline.
And the tobacco powder outlet of the cyclone separator is connected with the feeding hole through a pipeline.
The inlet of the dust remover is connected with the cyclone separator, the gas outlet is connected with the exhaust fan, and the dust outlet is connected with the feed inlet through a pipeline.
The application also provides a method for measuring the dispersion characteristic of the tobacco powder spraying, which uses the measuring system of any one of the above steps, and comprises the following steps:
in the application, the mesh number of the tobacco powder is one or a combination of more than one of 50 meshes to 3000 meshes.
High-pressure compressed air generated by the air compressor 1 and the freeze dryer 2 is divided into four streams of pressurized air, fluidized air, supplementary air and central air through the pressure buffer tank 3.
A stirrer 5 controlled by a gear reducer 4 is arranged above the stock bin, pressurized air enters the upper part of the stock bin 7 to ensure the pressure of the stock bin to be stable, fluidized air enters an air distribution chamber 8 at the bottom of the stock bin and uniformly fluidizes tobacco powder at the bottom of the stock bin through an air distribution plate, and a flow controller 19 controls the size of the fluidized air to be 0.4m3And h, discharging the fluidized tobacco powder from the side surface under the conveying pressure difference of the pressurizing air and the fluidizing air, and feeding the fluidized tobacco powder into the solid conveying pipeline 25.
The supplementary air pipeline 23 is converged into the solid conveying pipeline 25 from the side, the supplementary air, the fluidizing air and the carried tobacco powder are mixed together to enter the outer ring channel of the outward flow type nozzle 9, the supplementary air, the fluidizing air and the carried tobacco powder are mixed with the central air conveyed by the central air pipeline 24 and the inner ring channel of the nozzle at the outlet of the outward flow type nozzle 9 and are sprayed to the organic glass dispersion chamber 10 together, and the supplementary air is controlled by the flow controller to be 0.6m3H, the central wind size is controlled to be 16m by the flow controller3/h。
The high-speed camera 12 directly takes a static picture of the flow field in the organic glass dispersion chamber 10; directly importing the images into a computer 13, editing a static image by image software image J, changing contrast and brightness contrast of a brightness enhanced image, repairing stains, then carrying out sharpening, filtering and edge detection processing, directly generating tangent straight lines, measuring an angle formed by the two tangent lines to be a dispersion angle, and calculating the average value of the dispersion angles obtained by taking a plurality of shot images; a ruler 11 in the diffusion chamber directly reads the interpenetration distance of the particle flow field.
The double-pulse laser 27 emits two laser beams with a time interval delta t of 100us, and a formed sheet light source 29 reaches a horizontal plane where the axis of the nozzle of the diffusion chamber is located through an internal sheet light source lens group 28; under the control of a synchronizer 32, a CCD camera 31 erected vertically above a laser plane shoots two flow field pictures with a time interval delta t of 100us and directly leads the two flow field pictures into a computer 13, insight 3G software adopts autocorrelation algorithm processing to obtain the displacement of the same particle when the difference delta t is 100us and simultaneously obtain the movement speed of the particle, time averaging is obtained for speed data of a plurality of instantaneous flow fields to obtain a time average flow field speed distribution diagram, and insight 3G software carries out superposition processing on the pictures shot at different moments to obtain time averaging to obtain the time average particle distribution diagram.
And moving the CCD camera 31, and shooting the diffusion chamber flow field in different areas for multiple times to obtain a time average flow field velocity distribution diagram and a time average particle distribution diagram of different areas.
The dispersed tobacco powder and gas are pumped out by the draught fan 14 and sequentially enter the cyclone separator 15 and the dust remover 16, the tobacco powder enters the storage bin again after passing through the cyclone separator 15 and the dust remover 16, and the gas is led out by the draught fan 14 and exhausted into the atmosphere after being filtered by the cyclone separator 15 and the dust remover 16.
In other embodiments of the present application, the amount of the fluidized air is replaced by other values, such as 0.3m3And h, detecting other parameters unchanged.
The air quantity of the supplementary air can be replaced by other values, such as 0.7m, by adjusting the flow controller3H, other parameters areAnd detecting.
By adjusting the flow controller, the size of the diffused wind is replaced, such as 20m3And/h, other parameters are not detected.
And adjusting the time interval delta t between two beams emitted by the double-pulse laser to be 110us by adjusting the synchronizer, and detecting other parameters in a time-varying manner.
The parameters of the fluidized air, the supplemented air, the diffused air, the interval time and the like can be changed, and the implementation of the technical scheme of the application is not influenced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A system for measuring the dispersion characteristics of a soot spray, comprising: a tobacco powder spraying system and a detection system;
the tobacco powder spraying system comprises:
the side wall of the storage bin is respectively provided with a feeding hole, a fluidized air inlet and a discharging hole; a stirring device is arranged in the storage bin, an air distribution chamber is arranged at the inner lower part of the storage bin, and the fluidized air inlet is communicated with the air distribution chamber;
the dispersion chamber is internally provided with a scale at the bottom, and the side wall of the dispersion chamber is provided with a dispersion chamber inlet and a dispersion chamber outlet;
one end of the solid conveying pipeline is provided with an outflow nozzle, the outflow nozzle is connected with the dispersion chamber inlet, and the other end of the outflow nozzle is connected with the feed opening;
the air supply system is respectively connected with the pressurizing air pipeline, the fluidizing air pipeline, the supplementary air pipeline and the central air pipeline;
the pressurized air pipeline is connected with a pressurized air inlet, the fluidized air pipeline is connected with the fluidized air inlet, the supplementary air pipeline is connected with the material outlet end of the solid conveying pipeline, which is close to the material outlet end, and the central air pipeline is connected with the outward flow type nozzle;
the detection system comprises:
a macroscopic detection platform, a microscopic detection platform and a data acquisition system;
the macroscopic detection platform comprises a high-speed camera, a lens of the high-speed camera is opposite to the diffusion chamber, and the high-speed camera is in electric signal connection with the data acquisition system;
the microscopic detection platform comprises a double-pulse laser, and a sheet light source emitted by the double-pulse laser is superposed with the section of the axis of a jet area formed in the dispersion chamber by the outflow nozzle;
the lens of the CCD camera vertically passes through the sheet light source of the injection area;
and the synchronizer is respectively connected with the double-pulse laser, the CCD camera and the data acquisition system.
2. The system for measuring the dispersion characteristics of tobacco powder spraying according to claim 1, wherein the air supply system comprises an air compressor, a freeze dryer and a pressure buffer tank which are connected in sequence, and ball valves are arranged on pipelines of the freeze dryer and the pressure buffer tank.
3. The system of claim 1, wherein a differential pressure sensor is disposed outside the bin.
4. The system for measuring the dispersion characteristics of tobacco powder spraying according to claim 1, wherein the outflow nozzle is a gas-solid two-phase flow nozzle, a central channel of the outflow nozzle is communicated with the central air pipeline, and an outer annular channel of the outflow nozzle is communicated with the solid conveying pipeline.
5. The system of claim 1, wherein the high speed camera has a capture speed of 1000 frames/s and an exposure time of 4x10-5s, picture resolution is 512x 1024.
6. The system of claim 1, wherein the double-pulse laser is an yttrium aluminum garnet crystal laser, each laser excited is far infrared light with a wavelength of 1064nm, each pulse has an energy of 135mJ, pulse intervals are adjustable, and the far infrared laser is frequency-doubled by an internal second harmonic generator to become green light with a wavelength of 532 nm.
7. The system for measuring soot blowing scattering properties of claim 1, wherein the CCD camera has an image resolution of 1600x2000 pixels and an exposure time of 4x10-5s, the shooting speed is 32 frames/s.
8. The system for measuring a soot spray dispersion characteristic of claim 1 further comprising a soot recovery system, said soot recovery system comprising:
an inlet of the induced draft fan is connected with an outlet of the dispersion chamber through a pipeline,
an inlet of the cyclone separator is connected with an outlet of the induced draft fan through a pipeline,
the tobacco powder outlet of the cyclone separator is connected with the feed inlet through a pipeline;
the inlet of the dust remover is connected with the cyclone separator, the gas outlet is connected with the exhaust fan, and the dust outlet is connected with the feed inlet through a pipeline.
9. A method for measuring the dispersion characteristics of a soot spray, characterized in that the use of a measuring system according to any one of the preceding claims 1 to 8 comprises the following steps:
1) pressurized air enters the upper part of the storage bin through a pressurized air pipeline, fluidized air enters an air distribution chamber at the bottom of the storage bin through a fluidized air pipeline, and the tobacco powder entering the storage bin is uniformly fluidized through an air distribution plate;
2) under the push of the pressure difference in the material bin, the tobacco powder which is fluidized uniformly enters the solid conveying pipeline through the feed opening, and meanwhile, the supplementary air is mixed with partial fluidized air and the tobacco powder in the solid conveying pipeline through the supplementary air pipeline to form mixed air flow which enters an outer ring channel of the outward flow type nozzle;
the central air enters the central channel of the outward flow type nozzle through the central air pipeline, is mixed with the mixed air flow at the outlet of the outward flow type nozzle, and is sprayed into the dispersion chamber;
3) the high-speed camera shoots a static picture of a particle flow field entering a dispersion chamber, and transmits the static picture to the data acquisition system, and the data acquisition system acquires a dispersion angle according to the static picture;
meanwhile, the penetration distance of the particle flow field is directly read through a ruler in the dispersion chamber;
4) the double-pulse laser emits two beams of laser with the time interval delta t and forms a sheet light source passing through the axis of the outflow nozzle;
the CCD camera shoots two particle flow field pictures with a time interval delta t under the control of the synchronizer;
5) transferring the particle flow field picture to a data acquisition system, processing to obtain the displacement of the same particle at the time of difference delta t, simultaneously obtaining the movement speed of the particle, and obtaining time average flow field speed data and a time average flow field speed distribution diagram at corresponding time through continuous shooting for multiple times;
6) the data acquisition system simultaneously carries out superposition processing on the particle flow field pictures shot at different moments to obtain a time-average particle distribution diagram;
7) moving a CCD camera, and shooting the particle flow field in different regions for multiple times to obtain a time average flow field velocity distribution diagram and a time average particle distribution diagram of different particle flow field regions;
8) the smoke powder and the gas in the dispersion chamber are pumped out by a draught fan and sequentially enter a cyclone separator and a dust remover, the smoke powder enters a storage bin again, and the gas is led out by an exhaust fan.
10. The method for measuring the scattering property of the sprayed tobacco powder according to claim 9, wherein the static image is processed by changing the contrast and brightness of the brightness enhancement pattern, repairing the stain, sharpening, filtering and edge detection processing to directly generate a tangent line and measuring the angle formed by the two tangent lines as the dispersion angle; the dispersion angles obtained for a plurality of still pictures taken are averaged to obtain an average dispersion angle.
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