CN112798479A - Multi-wavelength-based wide-screening particle size online measurement system and method - Google Patents
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- 239000002245 particle Substances 0.000 title claims abstract description 118
- 238000005259 measurement Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012216 screening Methods 0.000 title claims abstract description 27
- 239000013307 optical fiber Substances 0.000 claims abstract description 22
- 239000000446 fuel Substances 0.000 claims description 18
- 238000009826 distribution Methods 0.000 claims description 7
- 238000001228 spectrum Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 2
- 238000000149 argon plasma sintering Methods 0.000 abstract description 3
- 238000012625 in-situ measurement Methods 0.000 abstract description 3
- 239000004744 fabric Substances 0.000 abstract description 2
- 238000000691 measurement method Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
- G01N15/0211—Investigating a scatter or diffraction pattern
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
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Abstract
The invention discloses a multi-wavelength-based wide-screening particle size online measurement system, which comprises the following steps: the laser generating device comprises three lasers with different wavelengths, a beam combiner and an optical fiber collimator, wherein the lasers emitted by the three lasers with different wavelengths are incident on the conveying belt to form light spots after passing through the beam combiner and the optical fiber collimator; the device comprises a scattered light receiving device and a light source, wherein the scattered light receiving device comprises a lens, a scattered light receiving beam splitter and three receiving channels, the three receiving channels comprise a narrow-band filter and a photomultiplier, and particles generate scattered signals when passing through light spots and are converted into electric signals after being focused by the lens and sequentially passing through the scattered light receiving beam splitter, the narrow-band filter and the photomultiplier; and the processing device receives the electric signal and processes the electric signal to obtain the particle size. The invention also discloses an on-line measurement method for the particle size of the wide-screening particles by adopting the device. The device and the method can realize the online in-situ measurement of the particle size of the wide-screen cloth particles based on the light scattering principle, the manual operation is not needed in the measurement process, and the measurement result is accurate and timely.
Description
Technical Field
The invention relates to the field of online particle size measurement, in particular to a multi-wavelength-based wide-screening particle size online measurement system and method.
Background
The particles in the bed material of a Circulating Fluidized Bed (CFB) boiler are generally distributed by a wide sieve with the particle size from small to large, and the flowing conditions and rules of the particles are different due to different diameters of the particles. Practice proves that the granularity of the fuel entering the furnace has certain influence on ignition starting, operation control, combustion efficiency, operation of components such as a blast cap, a water-cooled wall and the like of the circulating fluidized bed boiler. For example, when the particles are too large, problems such as a decrease in bed pressure and unevenness in bed surface temperature may occur. CFB boilers generally use a conveyor belt to transport fuel to the boiler, and therefore, accurate and rapid measurement of the particle size of incoming fuel particles on the conveyor belt is of great importance to safe and economical operation of the boiler.
The traditional particle size measurement method in the industrial field is a screening method, wherein fuel samples with known weight are placed on sieves with different mesh sizes and arranged in sequence and are mechanically vibrated, so that the particles continuously pass through the sieves with smaller mesh sizes, and the particles retained on the sieves are weighed to count the percentage of the mass of each particle fraction in the total sample weight, so as to obtain the particle size distribution of the sample. The screening method has simple measurement principle and reliable result, but needs sampling and takes longer time for detection, and the measurement result lags behind and cannot meet the rapid change of industrial production.
At present, the relative current and advanced methods mainly include a laser particle size method and a machine vision method, for example, a chinese patent with publication number CN107255608A discloses a particle size measuring instrument based on a single photodetector, and a chinese patent with publication number CN109598715A discloses a material particle size online detection method based on machine vision. The laser particle size method is used for obtaining the particle size by emitting a beam of laser and receiving and analyzing diffraction or scattering light signals generated after the laser is blocked by particles. The machine vision method converts a target into an image signal through a particle image in a certain area on a particle flow, and then identifies and calculates target parameters in the image by using a related processing algorithm to identify and analyze the particles. The method has low cost, no damage to the sample, wide range of the detected particle size, and capability of analyzing micron-sized to millimeter-sized particles simultaneously.
Disclosure of Invention
The invention provides a multi-wavelength-based wide-screening particle size online measurement system and method, which can realize online in-situ measurement of the particle size of wide-screening cloth particles, do not need manual operation in the measurement process, and have accurate and timely measurement results.
The invention provides the following technical scheme:
a multi-wavelength based wide-screening particle size online measurement system, the system comprising:
the laser generating device comprises three lasers with different wavelengths, a beam combiner and an optical fiber collimator, wherein the lasers emitted by the three lasers with different wavelengths are incident on the conveying belt to form light spots after passing through the beam combiner and the optical fiber collimator;
the device comprises a scattered light receiving device and a light source, wherein the scattered light receiving device comprises a lens, a scattered light receiving beam splitter and three receiving channels, the three receiving channels comprise a narrow-band filter and a photomultiplier, and particles generate scattered signals when passing through light spots and are converted into electric signals after being focused by the lens and sequentially passing through the scattered light receiving beam splitter, the narrow-band filter and the photomultiplier;
and the processing device receives the electric signal and processes the electric signal to obtain the particle size.
Preferably, the incident light emitted by the optical fiber collimator vertically enters the plane of the conveying belt downwards, and an included angle between the incident light and a receiving light path formed by the lens and the scattered light receiving beam splitter is 15-75 degrees. Further preferably, the included angle is 30 degrees.
Preferably, the laser generating device and the scattered light receiving device are connected and fixed by a cage system.
Preferably, the cage system is suspended above the conveyor belt by a support.
Preferably, the three lasers with different wavelengths include a solid continuous laser with the wavelength of 400nm to 500nm, a solid continuous laser with the wavelength of 500nm to 600nm and a semiconductor continuous laser with the wavelength of 600nm to 800 nm. Superior food
Preferably, the three lasers with different wavelengths are arranged in parallel with each other.
Preferably, the laser power is 0 to 5W.
Preferably, the central wavelengths of the narrow-band filters in the three receiving channels are 400nm to 500nm, 500nm to 600nm and 600nm to 800 nm.
Preferably, the peak wavelengths of the photomultiplier tubes in the three receiving channels are 400nm to 500nm, 500nm to 600nm, and 600nm to 800 nm.
Preferably, the three receiving channels are arranged in parallel with each other.
Preferably, the diameter of the light spot formed on the conveying belt is 0.05mm to 1 mm.
The invention also provides a method for measuring the granularity of the wide-screening particles on line by using the device, which comprises the following steps: the collected multichannel scattered light signals are subjected to Fourier transform to obtain
And
performing signal fitting and decomposition on the fuel to match the composition components of different particle sizes in the frequency spectrum to obtain the wide screening of the fuelParticle size distribution data; the conveyer belt continuously runs to drive particles with different sizes to continuously pass through the measuring light spots, signals are collected and processed by a calculation program, and the fuel particle size distribution can be obtained in real time;
the method specifically comprises the following steps:
(1) the three lasers with different wavelengths are started simultaneously, the lasers with different wavelengths emitted by the lasers are conducted by the optical fibers and enter the beam combiner, and the combined lasers are connected to the optical fiber collimator by the optical fibers and irradiate the optical fiber collimator onto the conveying belt to form light spots;
(2) the conveyer belt transmits fuel particles at a certain speed, the particles generate scattering signals through light spots, and the scattering signals are focused by the lens, converted into electric signals through the scattering light receiving beam splitter, the narrow-band filter and the photomultiplier in sequence and transmitted to the computer;
(3) computer processing electric signal to obtain scattered light intensity response curve with time
And
wherein
And
respectively, at the wavelength lambda of the particles1、λ2And λ3The intensity of the scattered light signal generated under the laser irradiation, and t is the recording time of the scattered light signal; matching
And
the medium particles are irradiated by laser with different wavelengths for a duration Deltat1、△t2And Δ t3Identifying particles to be detected in the same part, and preliminarily calculating the particle size of the particles to be detected according to the known speed of the conveying belt and the signal duration;
(4) extraction of Deltat1、△t2And Δ t3Corresponding signal strength in time
And
fourier transform is carried out to obtain the composition frequency F of the particles to be measured in the frequency spectrum1(△ω1)、F2(△ω2) And F3(△ω3) And comparing the particle size of the particle to be detected with the calibration result of the known particle size under the laser irradiation of each wavelength, matching the closest calibration particle size, and further determining the particle size of the particle to be detected.
The measurement can be finished by shutting down the conveyor belt or simultaneously shutting down the three lasers.
The multi-wavelength-based wide-screening particle size online measurement system is arranged beside a fuel conveyor belt, and the fuel is industrial power coal with the equal particle size of more than micron.
The invention discloses a multi-wavelength-based wide-screening particle size online measurement system and method, which are based on a light scattering principle, can realize online in-situ measurement of particle size data distributed by a wide screen in a circulating fluidized bed material in an industrial field in the conveying process of the circulating fluidized bed material in the industrial field, do not need manual operation in the measurement process, have accurate and timely measurement results and have outstanding economic benefits.
Drawings
Fig. 1 is a schematic structural diagram of a multi-wavelength-based wide-screening particle size online measurement system provided by the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, it should be noted that the examples are only for the purpose of further illustration and should not be construed as limiting the scope of the present invention.
As shown in FIG. 1, the multi-wavelength-based wide-screening particle size online measurement system provided by the invention comprises a laser generation device, a scattered light receiving device and a computer.
The laser generating device comprises a first laser 1, a second laser 2, a third laser 3, a beam combiner 4 and a fiber collimator 5. The three lasers are arranged in parallel, and three beams of laser with different wavelengths are synthesized into a beam through the beam combiner 4 and then are connected to the optical fiber collimator 5 through the optical fiber to be focused on the conveying belt 15 to form a light spot.
The scattered light receiving means includes a lens 6, a scattered light receiving beam splitter 7, and three receiving channels: the first receiving channel comprises a first narrow band filter 8 and a first photomultiplier tube 11; the second receiving channel comprises a second narrow band filter 9 and a second photomultiplier tube 12; the third receiving channel comprises a third narrow band filter and a third photomultiplier tube 13. The three receiving channels are arranged in parallel and connected to the computer 14 for signal transmission and processing.
The light path of the laser emitting device and the light path of the scattered light receiving device are connected and fixed by a cage system, so that the optical elements are ensured to be installed along a common optical axis. Incident light emitted by the optical fiber collimator 5 vertically irradiates the plane of the conveying belt downwards, and an included angle between the incident light and a receiving light path formed by the lens 6 and the scattered light receiving beam splitter 7 is 30 degrees.
And a support is arranged above the conveying belt 15, and the laser emitting device and the scattered light receiving device are both hung on the support by a cage system.
The first laser 1, the second laser 2 and the third laser 3 can emit continuous laser light of 457nm, 532nm and 650nm with power adjustment ranges of 0-5W, respectively.
The first photomultiplier 11, the second photomultiplier 12 and the third photomultiplier 13 can convert the received scattered light signals into electrical signals, amplify and transmit the electrical signals to a computer, and the computer converts the received electrical signals into image signals and obtains particle size data of particles through software program processing.
The specific operation flow is as follows:
the first laser 1, the second laser 2 and the third laser 3 respectively emit continuous laser with the wavelengths of 457nm, 532nm and 650nm, and the continuous laser is conducted into the beam combiner 4 through optical fibers. Three beams of laser with different wavelengths are combined into one beam of laser in the beam combiner 4, the combined laser is connected to the optical fiber collimator 5 through an optical fiber and focused on the conveying belt 15 to form a light spot with the diameter of 0.1mm, and the incident laser light spot irradiates fuel particles moving along the conveying belt to generate a scattering phenomenon. According to the principle of light scattering, the intensity of the scattered light intensity signal is related to the particle size and the laser wavelength. The scattered light is collected by a lens 6 and then received by a scattered light receiving beam splitter 7 and is divided into three receiving light paths, a first narrow-band filter 8, a second narrow-band filter 9 and a third narrow-band filter 10 have selectivity and only allow light with one wavelength to pass through, a first photomultiplier tube 11, a second photomultiplier tube 12 and a point photomultiplier tube 13 respectively record scattered light signals with three specific wavelengths and transmit the scattered light signals to a computer 14, and the computer 14 further processes the scattered light signals by using a scattered light signal calculation program to obtain particle size data of particles.
During measurement:
the first laser 1, the second laser 2 and the third laser 3 are simultaneously started, light spots are focused at one position after the lasers are closed, the conveyer belt 15 transmits fuel particles at a certain speed, the particles generate scattering signals through the light spots, and the first photomultiplier tube 11, the second photomultiplier tube 12 and the third photomultiplier tube 13 collect electric signals which change along with time and transmit the electric signals to a computer.
The computer obtains the response curve of the scattered light intensity along with the time
And
wherein λ1、λ2And λ3Three laser wavelengths, t is the scattered light signal recording time. Because the diameters of light spots are the same after the lasers with different wavelengths are combined, the scattered light signals generated by the same particle under the irradiation of the lasers with different wavelengths have different intensities P and the same duration time Deltat, and are matched through a proper algorithm
And
middle delta t1、△t2And Δ t3And identifying the particles to be detected in the same part, and preliminarily calculating the particle size of the particles to be detected according to the known speed of the conveying belt and the signal duration.
Extraction of Deltat1、△t2And Δ t3Corresponding signal strength in time
And
fourier transform is carried out to obtain the composition frequency F of the particles to be measured in the frequency spectrum1(△ω1)、F2(△ω2) And F3(△ω3) And comparing the particle size with the calibration result of the known particle size under the laser irradiation of each wavelength, matching the closest calibration particle size through a proper algorithm, and further determining the particle size of the particle to be detected.
The collected multichannel scattered light signals are subjected to Fourier transform to obtain
And
and performing signal fitting and decomposition on the fuel, matching the composition components of the particles with different particle sizes in the frequency spectrum, and obtaining the wide-screening particle size distribution data of the fuel.
The conveyer belt 15 runs continuously to drive the particles with different sizes to pass through the measuring light spots continuously, and the fuel particle size distribution can be obtained in real time by acquiring signals and processing the signals by using a calculation program. The measurement can be finished by shutting down the conveyor belt 15 or simultaneously shutting down the first laser 1, the second laser 2 and the third laser 3.
The present invention is described in detail with reference to the embodiments, but the embodiments of the present invention are not limited by the embodiments, and any other changes, substitutions, combinations and simplifications made under the teaching of the patent core of the present invention are included in the protection scope of the present invention.
Claims (10)
1. A multi-wavelength based wide-screening particle size on-line measurement system, comprising:
the laser generating device comprises three lasers with different wavelengths, a beam combiner and an optical fiber collimator, wherein the lasers emitted by the three lasers with different wavelengths are incident on the conveying belt to form light spots after passing through the beam combiner and the optical fiber collimator;
the device comprises a scattered light receiving device and a light source, wherein the scattered light receiving device comprises a lens, a scattered light receiving beam splitter and three receiving channels, the three receiving channels comprise a narrow-band filter and a photomultiplier, and particles generate scattered signals when passing through light spots and are converted into electric signals after being focused by the lens and sequentially passing through the scattered light receiving beam splitter, the narrow-band filter and the photomultiplier;
and the processing device receives the electric signal and processes the electric signal to obtain the particle size.
2. The multi-wavelength-based wide-screening particle size online measurement system according to claim 1, wherein incident light emitted by the optical fiber collimator is vertically incident downwards to a conveying belt plane, and the incident light forms an included angle of 15 degrees to 75 degrees with a receiving light path composed of a lens and a scattered light receiving beam splitter.
3. The multi-wavelength-based wide-screening particle size online measurement system according to claim 1, wherein the laser generation device and the scattered light receiving device are connected and fixed by a cage system.
4. The multi-wavelength-based wide-screening particle size online measurement system of claim 3, wherein the cage system is suspended above the conveyer belt by a support.
5. The multi-wavelength-based wide-screening particle size online measurement system of claim 1, wherein the three lasers with different wavelengths comprise a solid continuous laser with wavelength of 400nm to 500nm, a solid continuous laser with wavelength of 500nm to 600nm and a semiconductor continuous laser with wavelength of 600nm to 800 nm.
6. The multi-wavelength-based wide-screening particle size online measurement system according to claim 5, wherein the laser power is 0 to 5W.
7. The multi-wavelength-based wide-screening particle size online measurement system according to claim 1, wherein the narrow-band filters in the three receiving channels have center wavelengths of 400nm to 500nm, 500nm to 600nm and 600nm to 800 nm.
8. The multi-wavelength based wide-screening particle size on-line measurement system of claim 1, wherein the photomultiplier tubes in the three receiving channels have peak wavelengths of 400nm to 500nm, 500nm to 600nm and 600nm to 800 nm.
9. The multi-wavelength based wide-screening particle size on-line measuring system of claim 1, wherein the diameter of the light spot formed on the conveyor belt is 0.05mm to 1 mm.
10. A method for on-line measurement of wide-screen particle size using the apparatus of any of claims 1-9, wherein the method comprises: the collected multichannel scattered light signals are subjected to Fourier transform to obtain
And
performing signal fitting and decomposition on the fuel, matching the composition components of particles with different particle sizes in a frequency spectrum, and obtaining wide screening particle size distribution data of the fuel; the conveyer belt continuously runs to drive particles with different sizes to continuously pass through the measuring light spots, signals are collected and processed by a calculation program, and the fuel particle size distribution can be obtained in real time;
the method specifically comprises the following steps:
(1) the three lasers with different wavelengths are started simultaneously, the lasers with different wavelengths emitted by the lasers are conducted by the optical fibers and enter the beam combiner, and the combined lasers are connected to the optical fiber collimator by the optical fibers and irradiate the optical fiber collimator onto the conveying belt to form light spots;
(2) the conveyer belt transmits fuel particles at a certain speed, the particles generate scattering signals through light spots, and the scattering signals are focused by the lens, converted into electric signals through the scattering light receiving beam splitter, the narrow-band filter and the photomultiplier in sequence and transmitted to the computer;
(3) computer processing electric signal to obtain scattered light intensity response curve with time
And
wherein
And
respectively, at the wavelength lambda of the particles1、λ2And λ3The intensity of the scattered light signal generated under the laser irradiation, and t is the recording time of the scattered light signal; matching
And
the medium particles are irradiated by laser with different wavelengths for a duration Deltat1、△t2And Δ t3Identifying particles to be detected in the same part, and preliminarily calculating the particle size of the particles to be detected according to the known speed of the conveying belt and the signal duration;
(4) extraction of Deltat1、△t2And Δ t3Corresponding signal strength in time
And
fourier transform is carried out to obtain the composition frequency F of the particles to be measured in the frequency spectrum1(△ω1)、F2(△ω2) And F3(△ω3) And comparing the particle size of the particle to be detected with the calibration result of the known particle size under the laser irradiation of each wavelength, matching the closest calibration particle size, and further determining the particle size of the particle to be detected.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117111560A (en) * | 2023-09-01 | 2023-11-24 | 廊坊市珍圭谷科技有限公司 | Environment monitoring method and system for manufacturing workshop |
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