CN109459361B - Dust measurement system - Google Patents
Dust measurement system Download PDFInfo
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- CN109459361B CN109459361B CN201811604852.6A CN201811604852A CN109459361B CN 109459361 B CN109459361 B CN 109459361B CN 201811604852 A CN201811604852 A CN 201811604852A CN 109459361 B CN109459361 B CN 109459361B
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- measurement system
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- 239000000428 dust Substances 0.000 title claims abstract description 97
- 238000005259 measurement Methods 0.000 title claims abstract description 54
- 239000002245 particle Substances 0.000 claims abstract description 58
- 239000000523 sample Substances 0.000 claims abstract description 29
- 238000003384 imaging method Methods 0.000 claims abstract description 27
- 238000004891 communication Methods 0.000 claims abstract description 9
- 238000010926 purge Methods 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 9
- 238000005057 refrigeration Methods 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims 4
- 230000005540 biological transmission Effects 0.000 claims 3
- 239000007789 gas Substances 0.000 description 65
- 238000000034 method Methods 0.000 description 30
- 230000031700 light absorption Effects 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 238000000149 argon plasma sintering Methods 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000005250 beta ray Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012625 in-situ measurement Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000002834 transmittance Methods 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
- G01N15/06—Investigating concentration of particle suspensions
-
- 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
- G01N15/075—Investigating concentration of particle suspensions by optical means
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The embodiment of the application discloses a dust measurement system, which comprises an imaging probe and a control unit; a light source, a camera and a gas channel are arranged in the imaging probe; the light source is used for emitting measuring light and enabling the measuring light to pass through the gas to be measured in the gas channel to form an interference image in the camera; the control unit is in communication connection with the camera and is used for reconstructing a gas particle image at a preset position according to the interference image, and the gas particle image is used for calculating dust content in the gas to be detected. The device is used for measuring the dust amount in the gas to be measured with high humidity.
Description
Technical Field
The application relates to the technical field of dust measurement, in particular to a dust measurement system.
Background
With the rapid development of Chinese economy, environmental problems are increasingly prominent, and government departments are increasingly raising emission standards to force high-energy enterprises to carry out technical upgrades in order to respond to the demands of people on good living environments. The latest emission standard requires that a dust removal technology is added after wet desulfurization, so that ultralow emission of various pollutants in the flue gas is realized, and the pollution to the environment is reduced. But this means that existing dust detection and monitoring equipment is faced with serious challenges: the ultra-low emission has higher requirements on the precision sensitivity and stability of the detection equipment, and the difficulty of dust measurement is greatly increased after the humidity of the flue gas is increased.
The traditional dust monitoring method mostly adopts a light absorption method, a light scattering method or a beta-ray method. The light absorption method is used for measuring the backward scattering intensity generated after light irradiates dust particles by measuring the absorption quantity of light waves passing through dust to reversely push the dust concentration, and the dust concentration is calculated by utilizing a Mie scattering theory. Both methods require a low humidity in the flue gas, so that conventional light absorption methods and light scattering methods are not suitable for dust measurement in wet flue gas. The beta-ray method can not continuously measure and can not realize the purpose of monitoring by measuring the quantity of the dust particles absorbing beta rays so as to calculate the dust concentration.
Therefore, there is a need for a dust measurement system that can be used to measure the dust content of a relatively humid gas under test.
Disclosure of Invention
The embodiment of the application provides a dust measurement system which can be used for measuring the dust content in gas to be measured with high humidity and can be used for realizing continuous measurement.
In view of this, the present application provides a dust measurement system comprising an imaging probe and a control unit;
A light source, a camera and a gas channel are arranged in the imaging probe;
the light source is used for emitting measuring light and enabling the measuring light to pass through the gas to be measured in the gas channel to form an interference image in the camera;
the control unit is in communication connection with the camera and is used for reconstructing a gas particle image at a preset position according to the interference image, and the gas particle image is used for calculating dust content in the gas to be detected.
Preferably, the method comprises the steps of,
The gas passage communicates with the outside.
Preferably, the method comprises the steps of,
The light source and the camera are oppositely arranged at two sides of the gas channel.
Preferably, the method comprises the steps of,
The light source consists of a single LED or an LED array.
Preferably, the method comprises the steps of,
The wavelength of the measuring light is in the range of 480mm to 500 mm.
Preferably, the method comprises the steps of,
The imaging probe further comprises a light transmissive element arranged in front of the light source and/or the camera.
Preferably, the method comprises the steps of,
The dust measurement system also comprises a purging component, wherein the purging component is used for purging dust particles and liquid drops on the surface of the light-transmitting piece.
Preferably, the method comprises the steps of,
The purging component comprises an air outlet and a purging unit;
The air outlet is arranged in the imaging probe and is positioned at the light-transmitting part;
The purging unit is used for outputting purging gas and is communicated with the air outlet.
Preferably, the method comprises the steps of,
When the light-transmitting piece is arranged in front of the camera, the camera is attached to the light-transmitting piece.
Preferably, the method comprises the steps of,
The dust measurement system further comprises a temperature control unit arranged in the imaging probe, wherein the temperature control unit is used for controlling the temperature of the camera within a preset range.
Preferably, the method comprises the steps of,
The temperature control unit is a semiconductor refrigeration module.
Preferably, the method comprises the steps of,
The imaging probes are multiple in number and are all in communication connection with the control unit.
Preferably, the method comprises the steps of,
The control unit is also used for calculating the quantity of dust particles according to the gas particle image and calculating the dust content in the gas to be detected according to the quantity of dust particles.
Preferably, the method comprises the steps of,
The dust measurement system further comprises a display unit which is in communication connection with the control unit;
The display unit is used for displaying dust content.
Preferably, the method comprises the steps of,
The control unit is also connected with the purging unit and used for controlling the purging unit to output purging gas.
Preferably, the method comprises the steps of,
The control unit is also connected with the temperature control unit and used for controlling the temperature control unit.
From the above technical solutions, the embodiment of the present application has the following advantages:
In an embodiment of the application, a dust measurement system is provided, which comprises an imaging probe and a control unit; a light source, a camera and a gas channel are arranged in the imaging probe; the light source emits measuring light, the measuring light passes through the gas to be measured in the gas channel, and the light beam passing through the gas particles and the light beam not passing through the gas particles interfere and are imaged in the camera; the control unit is in communication connection with the camera, and can reconstruct a gas particle image at a preset position according to the interference image, because the liquid drops in the gas particles have poor light absorption capability and the dust particles in the gas particles have strong light absorption capability, the light beams passing through the gas particles and the dust particles show larger difference on the interference image, so that the liquid drops and the dust particles can be accurately distinguished in the reconstructed gas particle image, the number of the dust particles can be calculated according to the gas particle image, and then the dust content in the gas to be detected can be calculated according to the number of the dust particles.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a dust measurement system according to an embodiment of the present application.
Detailed Description
In order to make the present application better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The inventors found in the research that in view of the light absorption method, the light scattering method and the beta-ray method can not realize the measurement of dust content in the gas to be measured with higher humidity, the dilution extraction type front scattering method, specifically, the effect of liquid drops on light scattering is eliminated through operations such as dilution, heating and the like, but the essence is still the light scattering method, and the method has severe gas temperature change in the sampling and discharging processes, and is easy to block the probe 1 and the pipeline.
Therefore, the embodiment of the application provides a dust measurement system, which can realize the measurement of the dust content in the gas to be measured with higher humidity, can realize continuous measurement, and does not have the problem that the probe 1 and a pipeline are blocked due to severe gas temperature change.
Referring specifically to fig. 1, a schematic structural diagram of an embodiment of a dust measurement system according to an embodiment of the present application is provided.
The present application provides an embodiment of a dust measurement system comprising an imaging probe 1 and a control unit 21.
A light source 11, a camera 13 and a gas channel 12 are arranged in the imaging probe 1.
The light source 11 is for emitting measurement light, and causes the measurement light to pass through the gas to be measured in the gas passage 12 to form an interference image in the camera 13.
It should be noted that, the gas particles in the gas to be measured include dust particles and liquid droplets, and the gas particles can absorb the measurement light, so that the light beam passing through the gas particles and the light beam not passing through the gas particles interfere and are imaged in the camera 13.
The positions of the camera 13 and the light source 11 are not particularly limited in the embodiment of the present application, as long as the measurement light emitted by the light source 11 can reach the entire target surface of the camera 13.
In addition, in order to achieve a more accurate measurement of the dust content, the gas channel 12 is generally not provided to be thick, for example, may be provided between 0.8cm and 1.1 cm.
The control unit 21 is in communication with the camera 13 and is adapted to reconstruct an image of gas particles at a preset position from the interference image, the gas particle image being used to calculate the dust content in the gas to be measured.
It should be noted that although both the dust particles and the liquid droplets can absorb light, the gas liquid droplets have poor light absorption capability and the dust particles have strong light absorption capability, so that the light beams passing through the two light droplets show a large difference in the interference image, and therefore the liquid droplets and the dust particles can be accurately distinguished from the reconstructed gas particle image, so that the number of the dust particles can be calculated according to the gas particle image, and then the dust content in the gas to be measured can be calculated according to the number of the dust particles.
In addition, reconstructing an image of a gas particle from an interference image is prior art, e.g., can be performed using fourier transform and diffraction law, which is not described in detail in the embodiments of the present application.
In the embodiment of the application, the dust measurement system utilizes the interference principle, so that not only can the accurate and continuous measurement of the dust content be realized, but also other parameters such as the diameter of dust particles and the like can be calculated according to the gas particle image; in addition, the application can fix the light source 11 and the camera 13 in the imaging probe 1 without a mechanical rotating structure, and has stable system and small maintenance amount; furthermore, the dust measurement system in the embodiment of the application has a wide dust measurement range, and is suitable for measuring low-concentration dust and high-concentration dust.
Further, the gas passage 12 communicates with the outside.
It will be appreciated that since the gas channel 12 communicates with the outside, the imaging probe 1 can be directly placed in the gas to be measured, and in-situ measurement of dust content can be achieved without performing sampling operations such as air extraction, and thus without requiring additional air extraction equipment.
Further, in order to achieve imaging in the camera 13 after the measurement light passes through the gas to be measured, as shown in fig. 1, the light source 11 and the camera 13 may be disposed opposite to each other on both sides of the gas channel 12.
Further, the light source 11 is composed of a single LED or an LED array, it being understood that when the light source 11 is composed of an LED array, structured light may be formed.
Further, the wavelength of the measurement light can be set in the range of 480mm to 500mm, because in this range, the absorption capacity of the droplet to the measurement light is lower, thereby enlarging the difference of the interference images formed by the droplet and the dust particle to realize high-precision resolution and measurement of the droplet and the dust particle.
Further, the imaging probe 1 may further comprise a light transmissive member 14 arranged in front of the light source 11 and/or the camera 13.
It will be appreciated that the gas to be measured contains a lot of dust and possibly also corrosive gas, so that in order to protect the light source 11 and the camera 13, a light transmitting member 14 may be provided in front of the camera 13 and the light source 11, wherein the light transmitting member 14 may be a protective glass.
Further, the dust measurement system may also include a purge assembly for purging dust particles and droplets from the surface of the optically transparent member 14.
It can be understood that, with the use of the dust measurement system, droplets and dust particles may adhere to the surface of the transparent member 14, which may affect the light transmittance of the transparent member 14, so the transparent member 14 may be cleaned by the purge component, thereby achieving the purpose of ensuring the cleaning of the transparent member 14; specifically, the purge assembly may inject high pressure gas onto the optically transmissive member 14.
Further, the purge assembly may include a purge unit 23 and an air outlet 15;
The air outlet 15 is disposed in the imaging probe 1 and is located at the light-transmitting member 14, as shown in fig. 1, the air outlet 15 is specifically disposed at one side of the surface of the light-transmitting member 14 and forms a certain angle with the light-transmitting member 14, and it should be noted that the location of the air outlet 15 is not limited to the location shown in fig. 1.
The purge unit 23 is for outputting purge gas, and communicates with the air outlet 15.
Note that the location of the purge unit 23 is not particularly limited, and may be integrated with the control unit 21.
Further, in order to reduce the influence of the medium between the camera 13 and the transparent member 14 on the measurement result, when the transparent member 14 is disposed in front of the camera 13, the camera 13 may be attached to the transparent member 14.
Further, the dust measurement system may further include a temperature control unit 16 disposed in the imaging probe 1, where the temperature control unit 16 is configured to control the temperature of the camera 13 within a preset range, as shown in fig. 1, the temperature control unit 16 is connected to the camera 13, and it is understood that the temperature control unit 16 may not be connected to the camera 13, as long as the temperature of the camera 13 can be controlled.
It should be noted that, the camera 13 is generally an industrial camera 13, and the operating temperature of the industrial camera 13 is generally below 60 degrees, so the temperature control unit 16 needs to be set to control the temperature of the camera 13 so that the temperature of the camera 13 is within the range of the normal operating temperature.
Further, since the operating temperature of the industrial camera 13 is generally 60 degrees or less, and in actual measurement, the gas to be measured is likely to be high-temperature gas such as flue gas in a chimney, the temperature control unit 16 may be provided as a semiconductor refrigeration module; further, in order to meet the requirement of integrating the temperature control unit 16 within the imaging probe 1, a small semiconductor refrigeration module may be employed.
Further, in order to ensure effective control of the temperature of the camera 13, the imaging probe 1 may be made of a material having a certain heat-insulating capability, so as to isolate the temperature of the external environment.
Further, the number of probes 1 may be plural and all are communicatively connected to the control unit 21 to achieve distributed measurement.
Further, the control unit 21 may also be used to calculate the number of dust particles from the gas particle image and to calculate the dust content in the gas to be measured from the number of dust particles.
It will be appreciated that calculating the number of dust particles from the gas particle image and the dust content in the gas to be measured from the number of dust particles may also be achieved by other means.
Further, the dust measurement system may further include a display unit 22 communicatively connected to the control unit 21, where the display unit 22 is configured to display the dust content, and in addition to this, the display unit 22 may be configured to display other information such as a gas particle image and the number of dust particles.
Further, the control unit 21 may also be connected to the purge unit 23 for controlling the purge unit 23 to output purge gas.
Further, the control unit 21 is also connected to the temperature control unit 16 for controlling the temperature control unit 16.
It should be noted that, in the embodiment of the present application, the control unit 21, the display unit and the purge unit 23 may be separately provided, or may be integrated together to form the analysis host 2 as shown in fig. 1, so that the dust measurement system only includes two parts of the imaging probe 1 and the analysis host 2, thereby facilitating use.
In addition, after the dust measurement system is used for a period of time, self-detection can be carried out, stains, scratches and the like on the protective glass can be marked, and the follow-up analysis and treatment are convenient to obtain accurate results.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A dust measurement system comprising an imaging probe and a control unit;
A light source, a camera and a gas channel are arranged in the imaging probe;
the light source is used for emitting measuring light and enabling the measuring light to pass through the gas to be measured in the gas channel to form an interference image in the camera;
The control unit is in communication connection with the camera and is used for reconstructing a gas particle image at a preset position according to the interference image, wherein the gas particle image is used for calculating the dust content in the gas to be detected;
the imaging probes are multiple in number and are all in communication connection with the control unit;
The wavelength of the measuring light is in the range of 480mm to 500 mm;
the light source consists of an LED array;
The imaging probe also comprises a light transmission piece arranged in front of the light source and/or the camera;
the device comprises a light transmission piece, a blowing component and a blowing component, wherein the blowing component is used for blowing dust particles and liquid drops on the surface of the light transmission piece;
the control unit is also used for calculating the quantity of dust particles according to the gas particle image and calculating the dust content in the gas to be detected according to the quantity of dust particles.
2. The dust measurement system of claim 1, wherein the gas channel is in communication with the outside.
3. The dust measurement system of claim 1, wherein the light source and the camera are disposed opposite each other on either side of the gas channel.
4. The dust measurement system of claim 1, wherein the purge assembly comprises a purge unit disposed at the air outlet;
The air outlet is arranged in the imaging probe and is positioned at the light-transmitting part;
The purging unit is used for outputting purging gas and is communicated with the air outlet.
5. The dust measurement system of claim 1, wherein the camera is attached to the light transmissive member when the light transmissive member is disposed in front of the camera.
6. The dust measurement system of claim 1, further comprising a temperature control unit disposed in the imaging probe for controlling a temperature of the camera within a preset range.
7. The dust measurement system of claim 6, wherein the temperature control unit is a semiconductor refrigeration module.
8. The dust measurement system of claim 1, further comprising a display unit communicatively connected to the control unit;
The display unit is used for displaying dust content.
9. The dust measurement system of claim 4, wherein the control unit is further coupled to the purge unit for controlling the purge unit to output purge gas.
10. The dust measurement system of claim 6, wherein the control unit is further coupled to the temperature control unit for controlling the temperature control unit.
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| CN201811604852.6A CN109459361B (en) | 2018-12-26 | 2018-12-26 | Dust measurement system |
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| CN109459361B true CN109459361B (en) | 2024-09-03 |
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| CN110595973A (en) * | 2019-10-22 | 2019-12-20 | 中国矿业大学(北京) | Mine dust monitoring method based on image |
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| WO2016180907A1 (en) * | 2015-05-12 | 2016-11-17 | Avl List Gmbh | Device and method for counting and/or measuring particles in a fluid flow |
| CN108519311A (en) * | 2018-03-07 | 2018-09-11 | 广州博冠光电科技股份有限公司 | A kind of smoke particle density real-time detection apparatus and method |
| CN209342569U (en) * | 2018-12-26 | 2019-09-03 | 广州市怡文环境科技股份有限公司 | A kind of dust measurement system |
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| JP6117093B2 (en) * | 2013-12-20 | 2017-04-19 | アズビル株式会社 | Particle detection apparatus and particle detection method |
| CN105092440A (en) * | 2014-05-06 | 2015-11-25 | 覃吴 | Multifunctional laser gas/dust online detection and analysis instrument |
| CN104568690A (en) * | 2015-01-07 | 2015-04-29 | 浙江南源环境工程技术有限公司 | PM2.5 dust detection device and PM2.5 dust detection system of wet-type electric dust collector |
| CN104897534A (en) * | 2015-05-14 | 2015-09-09 | 苏州奥德克光电有限公司 | Wet flue gas on-line dust meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016180907A1 (en) * | 2015-05-12 | 2016-11-17 | Avl List Gmbh | Device and method for counting and/or measuring particles in a fluid flow |
| CN108519311A (en) * | 2018-03-07 | 2018-09-11 | 广州博冠光电科技股份有限公司 | A kind of smoke particle density real-time detection apparatus and method |
| CN209342569U (en) * | 2018-12-26 | 2019-09-03 | 广州市怡文环境科技股份有限公司 | A kind of dust measurement system |
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