CN106323826B - Ultralow emission smoke monitoring device and monitoring method - Google Patents
Ultralow emission smoke monitoring device and monitoring method Download PDFInfo
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- CN106323826B CN106323826B CN201611004246.1A CN201611004246A CN106323826B CN 106323826 B CN106323826 B CN 106323826B CN 201611004246 A CN201611004246 A CN 201611004246A CN 106323826 B CN106323826 B CN 106323826B
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- 239000000779 smoke Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000012544 monitoring process Methods 0.000 title claims abstract description 25
- 238000012806 monitoring device Methods 0.000 title claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 54
- 239000000428 dust Substances 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 9
- 230000008878 coupling Effects 0.000 claims abstract description 3
- 238000010168 coupling process Methods 0.000 claims abstract description 3
- 238000005859 coupling reaction Methods 0.000 claims abstract description 3
- 230000001678 irradiating effect Effects 0.000 claims abstract description 3
- 239000004071 soot Substances 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical group [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000003546 flue gas Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000013618 particulate matter Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 12
- 238000000149 argon plasma sintering Methods 0.000 description 5
- 238000000790 scattering method Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000005250 beta ray Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
Classifications
-
- 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, e.g. by light scattering, diffraction, holography or imaging
- G01N15/0211—Investigating a scatter or diffraction pattern
-
- 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
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
Abstract
The invention provides an ultralow emission smoke monitoring device and a monitoring method, which are used for monitoring the particle size distribution and concentration of smoke in a smoke measuring area. The monitoring device includes: a multi-wavelength laser light source section and a multi-angle photoelectric detection section, wherein the multi-wavelength laser light source section has: a plurality of lasers for simultaneously emitting laser light of different wavelengths; the coupler is used for coupling lasers with different wavelengths; the collimator is used for collimating the coupled laser to obtain multi-wavelength laser used for irradiating the smoke dust measuring area; the multi-angle photodetection unit includes: the photoelectric detectors are respectively arranged at a certain angle with the collimator and can distinguish the laser intensities of different wavelengths, and are used for receiving the multi-wavelength laser scattered by the smoke dust particles and converting the multi-wavelength laser into an electric signal; a signal modulator for receiving and modulating the electric signal; and a signal processor for processing the modulated electric signals to obtain the particle size and concentration of the smoke dust.
Description
Technical Field
The invention belongs to the field of dust particle size and concentration testing, and particularly relates to an ultralow emission dust monitoring method and device based on a multi-wavelength multi-angle laser angle scattering principle.
Background
The particle concentration of soot is one of the important parameters characterizing the soot pollutant emissions. The current weighing method is a universal international detection method for particle pollutants, and forms a real-time sampling smoke concentration analysis method such as a continuous weighing method, a beta-ray method and the like and an online concentration analysis method such as a charge method, a light scattering method and the like due to the online measurement requirement.
However, with the improvement of environmental protection requirements and the progress of dust removal technology, the concentration and granularity of ultralow emission smoke are greatly reduced, and if a sampling method is adopted for measurement, the single sampling time is longer; if the measurement is carried out by adopting an online method, the test error is larger.
In order to solve the problem of monitoring ultra-low emission smoke dust, an angular scattering method is generally adopted, wherein a laser and a photoelectric detector are installed in a measuring area in an angle mode, the laser emits laser to irradiate the measuring area, and the photoelectric detector receives an angular scattering signal. Because the influence of the particle size on the angular scattering light intensity is generally ignored in industry, the intensity of the angular scattering light signal is simplified to be in direct proportion to the concentration of the smoke dust, and therefore, the concentration of the smoke dust can be determined through the ratio of the initial light intensity of the laser to the angular scattering light signal after the proportionality coefficient is obtained through an experimental calibration method. The average particle size of the smoke dust can be calculated by combining the rice scattering theory.
However, for ultra-low emission smoke, the influence of particle size on angular scattering light intensity cannot be ignored, so that the error of measuring the ultra-low emission smoke by the traditional angular scattering method and the industrial measuring instrument is larger at present, and the information of particle size distribution (particle size) cannot be obtained.
Disclosure of Invention
The invention aims to provide an ultralow emission smoke monitoring method and device based on a multi-wavelength multi-angle laser angle scattering principle, which can reduce the measurement lower limit of the existing angle scattering smoke monitoring device and method and improve the measurement precision by the multi-wavelength multi-angle laser angle scattering method, and has the advantages of online, non-contact, easy maintenance and the like.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides an ultralow emission smoke monitoring device which is used for monitoring the particle size distribution and concentration of smoke in a smoke measuring area and has the technical characteristics that the device comprises a multi-wavelength laser light source part and a multi-angle photoelectric detection part. Wherein the multi-wavelength laser light source section comprises: a plurality of lasers for simultaneously emitting laser light of different wavelengths; the coupler is used for coupling lasers with different wavelengths; and the collimator is used for collimating the coupled laser to obtain the multi-wavelength laser used for irradiating the smoke measuring area. The multi-angle photodetection unit includes: the photoelectric detectors are respectively arranged at a certain angle with the collimator and can distinguish the laser intensities of different wavelengths, and are used for receiving the multi-wavelength laser scattered by the smoke dust particles and converting the multi-wavelength laser into an electric signal; a signal modulator for receiving and modulating the electric signal; and a signal processor for processing the modulated electric signals to obtain the particle size and concentration of the smoke dust.
The ultralow emission smoke monitoring device provided by the invention has the following technical characteristics: one of the photodetectors is collinear with the collimator, directly opposite the collimator.
The ultralow emission smoke monitoring device provided by the invention has the following technical characteristics:
the laser, the coupler and the collimator are connected through optical fibers, and the photoelectric detector, the signal modulator and the signal processor are connected through cables.
Furthermore, the invention also provides an ultralow emission smoke monitoring method, which has the technical characteristics that the method comprises the following steps: step 1, determining the working wavelength of each laser and the installation angle of each photoelectric detector according to a measuring object and requirements; step 2, a multi-wavelength laser light source part is opened, so that multi-wavelength laser irradiates a measuring area and triggers all photoelectric detectors to work, the multi-wavelength laser scattered by smoke dust particles is received, and the corresponding intensities of scattered light with different wavelength angles are resolved and converted into electric signals; step 3, a signal modulator is adopted to receive the electric signal and modulate the electric signal; and 4, processing the modulated electric signals by adopting a signal processor to obtain the particle size distribution and concentration of the smoke dust.
According to the ultra-low emission smoke monitoring method based on the multi-wavelength multi-angle laser angle scattering principle, the processing principle in the step 4 is the meter scattering theory, and as the measurement area is set to be a narrow space, the signal processor can obtain the scattered light intensity of single particles under the condition of light incidence according to the meter scattering theory, the scattered light intensity is as follows:
wherein lambda is the laser wavelength; r is the distance from the particle to the detection point; i (θ) is a scattered light amplitude function, which is a function of the soot particle size D and the scattering angle θ; i 0 Is the intensity of the incident light. The scattering angle θ is the angle formed by the scattered light received by the photodetector and the incident light.
Therefore, the specific wavelength, specific angle laser angle scattering light scattering intensity is:
where subscript i is the specific laser wavelength combined with the specific angle. Through the multi-wavelength and multi-angle combination of the multi-wavelength and multi-angle laser angle scattering principle, an equation set can be established, the corresponding particle size of the discharged smoke particles can be obtained through solving, and counting statistics is carried out to obtain the number distribution of the particle sizes.
Thus, the volume concentration of the particles can be obtained:
wherein V is Di Is n particle diameters D i Total volume of particles, V is measured total volume, v=s×v, S is spot area, V is flue gas flow rate.
The actions and effects of the invention
According to the ultra-low emission smoke monitoring device and the monitoring method, the multi-wavelength laser light source part is provided with the plurality of lasers capable of emitting lasers with different wavelengths at the same time, and the multi-angle photoelectric detection part is provided with the plurality of photoelectric detectors which are arranged at a certain angle with the collimator and can distinguish the laser intensities with different wavelengths, so that the ultra-low emission smoke monitoring device and the monitoring method can simultaneously set a plurality of different laser wavelengths for particle size distribution characteristics of particles in ultra-low emission smoke through a multi-wavelength multi-angle laser angle scattering method, a plurality of angle scattering signals are obtained at the same time, and the concentration and the particle size distribution of the smoke in a smoke measuring area can be obtained through detection and analysis of the angle scattering signals. The device and the method not only reduce the lower measurement limit of the existing angle scattering smoke dust monitoring device and method and improve the measurement precision, but also have the advantages of online, non-contact, easy maintenance and the like.
Drawings
FIG. 1 is a schematic diagram of an ultralow emission smoke monitoring device according to an embodiment of the present invention;
FIG. 2 is a flow chart of an ultra low emission soot monitoring method according to an embodiment of the present invention.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings.
Fig. 1 is a schematic structural view of an ultralow emission smoke monitoring device according to an embodiment of the present invention.
The ultra-low emission soot monitoring device 100 is disposed near the emission soot measuring region 30, and includes a multi-wavelength laser light source section 10 and a multi-angle photo-electric detection section 20. The multi-wavelength laser light source section 10 is for providing a measuring light source and illuminating a measuring area, and the multi-angle photo detection section 20 is for multi-angle detecting laser scattered light signals.
The multi-wavelength laser light source unit 10 includes a plurality of lasers, a multi-wavelength fiber coupler 102, and a collimator 101, which are connected by optical fibers.
Laser light emitted by a plurality of lasers such as the laser 1 (103), the laser 2 (104) … … and the laser n (105) is transmitted to the multi-wavelength optical fiber coupler 102 through the plurality of optical fibers 107 to be coupled, and then transmitted to the collimator (101) through the optical fibers 106 to be collimated, and then emitted to the multi-wavelength laser 301, and irradiates the emission smoke measuring area 30.
The multi-angle photodetection portion 20 includes a photodetector, a signal modulation unit, and a signal processing unit connected by a cable.
Each photoelectric detector can distinguish the laser intensity of different wavelengths, the photoelectric detectors are respectively arranged at a certain angle with the collimator, one of the photoelectric detectors is positioned on the same straight line with the collimator 101 and is positioned right opposite to the collimator 101, and is used for monitoring the light signal of the transmitted light 302 of the incident laser, and the light intensity of the transmitted light can be approximately regarded as the initial incident light intensity of the laser due to the ultra-low concentration of discharged smoke dust.
After the multi-wavelength laser 301 irradiates the dust particles in the discharged dust measurement area 30 to generate light scattering, the light scattering signals with different angles are received by the corresponding photodetectors 1 (201), 2 (202) and 3 (203) … … and converted into electric signals by the corresponding photodetectors n (204). In this embodiment, the photodetector 1 (201) is located on the right opposite side of the collimator 101 for monitoring the initial incident light intensity, and the photodetectors 2, 3, … … n are respectively at different angles to the incident light for detecting the light signals of the multi-angle laser angle scattered light 303.
The signal modulation unit 205 is used for modulating the electrical signal generated by photoelectric detection, and transmitting the electrical signal to the signal processing unit 206 for processing, so as to obtain the information of the particle size and concentration of the smoke.
Fig. 2 is a flowchart of an ultralow emission smoke monitoring method in the present embodiment.
As shown in fig. 2, the ultra-low emission soot monitoring method includes the steps of:
step 1, determining the working wavelength of each laser and the installation angle of each photoelectric detector according to a measuring object and requirements;
step 2, a multi-wavelength laser light source part is opened, so that multi-wavelength laser irradiates a measuring area and triggers all photoelectric detectors to work, the multi-wavelength laser scattered by smoke dust particles is received, and the corresponding intensities of scattered light with different wavelength angles are resolved and converted into electric signals;
step 3, receiving and modulating the electric signal by adopting a signal modulator;
and 4, processing the modulated electric signals by adopting a signal processor to obtain the particle size distribution and concentration of the smoke dust.
The basic principle of the ultra-low emission smoke monitoring method based on the multi-wavelength multi-angle laser angle scattering principle is the meter scattering theory, and because the measurement area is set to be a narrow space, the signal processor can obtain the scattered light intensity of single particles under the condition of light incidence according to the meter scattering theory as follows:
wherein lambda is the laser wavelength; r is the distance from the particle to the detection point; i (θ) is a scattered light amplitude function, which is a function of the soot particle size D and the scattering angle θ; i 0 Is the intensity of the incident light. The scattering angle θ is the angle formed by the scattered light received by the photodetector and the incident light.
Therefore, the specific wavelength, specific angle laser angle scattering light scattering intensity is:
where subscript i is the specific laser wavelength combined with the specific angle. Through the multi-wavelength and multi-angle combination of the multi-wavelength and multi-angle laser angle scattering principle, an equation set can be established, the corresponding particle size of the discharged smoke particles can be obtained through solving, and counting statistics is carried out to obtain the number distribution of the particle sizes.
Thus, the volume concentration of the particles can be obtained:
wherein V is Di Is n particle diameters D i Total volume of particles, V is measured total volume, v=s×v, S is spot area, V is flue gas flow rate.
Example operation and Effect
According to the ultralow emission smoke monitoring device and the monitoring method, the multi-wavelength laser light source part is provided with the plurality of lasers capable of emitting lasers with different wavelengths at the same time, and the multi-angle photoelectric detection part is provided with the plurality of photoelectric detectors which are arranged at a certain angle with the collimator and can distinguish the laser intensities with different wavelengths, so that the particle size distribution characteristics of particles in ultralow emission smoke can be simultaneously set with a plurality of different laser wavelengths by the multi-wavelength multi-angle laser angle scattering method, a plurality of angle scattering signals can be obtained at the same time, and the concentration and the particle size distribution of the smoke in the smoke measuring area can be obtained by detecting and analyzing the angle scattering signals. The device and the method not only reduce the lower measurement limit of the existing angle scattering smoke dust monitoring device and method and improve the measurement precision, but also have the advantages of online, non-contact, easy maintenance and the like.
The present invention is not limited to the scope of the specific embodiments, and all the inventions made using the inventive concept are claimed as long as various modifications are apparent to those skilled in the art within the spirit and scope of the invention as defined and defined in the appended claims.
Claims (5)
1. An ultra-low emission smoke monitoring method is characterized by comprising the following steps:
step 1, determining the working wavelength of each laser and the installation angle of each photoelectric detector according to a measuring object and requirements;
step 2, a multi-wavelength laser light source part is opened, so that multi-wavelength laser irradiates a measuring area and triggers all photoelectric detectors to work, the multi-wavelength laser scattered by smoke dust particles is received, and the corresponding intensities of scattered light with different wavelength angles are resolved and converted into electric signals;
step 3, a signal modulator is adopted to receive the electric signal and modulate the electric signal;
step 4, adopting a signal processor to process the modulated electric signals to obtain the particle size and concentration of the smoke dust,
wherein, in step 4, the signal processor calculates the particle size of the soot according to the following formula:
wherein, the subscript I is the combination of a specific laser wavelength and a specific angle, I si Is the scattered light intensity in the case of light incidence; lambda (lambda) i Is the laser wavelength; r is the distance from the particle to the detection point; i (θ) is the amplitude function of scattered light, and is the particle size D and the scattering angle θ i Is a function of (2); i 0i For incident light intensityDegree.
2. The ultra-low emission soot monitoring method according to claim 1, wherein:
wherein, in step 4, the signal processor obtains the volume concentration of the particulate matter according to the following formula:
wherein V is Di Is n particle diameters D i Total volume of particles, V is measured total volume, v=s×v, S is spot area, V is flue gas flow rate.
3. The ultra-low emission soot monitoring method according to claim 1 or 2, wherein:
wherein, the ultra-low emission smoke monitoring method uses an ultra-low emission smoke monitoring device to monitor the particle size distribution and concentration of smoke in a smoke measuring area,
the ultra-low emission smoke monitoring device comprises:
a multi-wavelength laser light source part and a multi-angle photoelectric detection part,
wherein the multi-wavelength laser light source section has:
a plurality of lasers for simultaneously emitting laser light of different wavelengths;
a coupler for coupling the laser beams of the different wavelengths; and
a collimator for collimating the coupled laser to obtain multi-wavelength laser for irradiating the smoke measuring area,
the multi-angle photoelectric detection unit includes:
the photoelectric detectors are respectively arranged at a certain angle with the collimator and can distinguish the laser intensities with different wavelengths, and are used for receiving the multi-wavelength laser scattered by the smoke particles and converting the multi-wavelength laser into an electric signal;
a signal modulator for receiving and modulating the electric signal; and
and the signal processor is used for processing the modulated electric signals to obtain the particle size and concentration of the smoke dust.
4. The ultra-low emission soot monitoring method according to claim 3, wherein:
wherein one of the photodetectors and the collimator are on the same straight line.
5. The ultra-low emission soot monitoring method according to claim 3, wherein:
wherein the laser, the coupler and the collimator are connected through optical fibers,
the photoelectric detector, the signal modulator and the signal processor are connected through cables.
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| CN113405961B (en) * | 2021-06-21 | 2022-10-14 | 中煤科工集团重庆研究院有限公司 | Dust concentration detection method based on multi-angle light scattering |
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