CN102410974A - On-line measurement method for particle size distribution and shape distribution of granules in airflow conveying pipe - Google Patents
On-line measurement method for particle size distribution and shape distribution of granules in airflow conveying pipe Download PDFInfo
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- CN102410974A CN102410974A CN2011104156246A CN201110415624A CN102410974A CN 102410974 A CN102410974 A CN 102410974A CN 2011104156246 A CN2011104156246 A CN 2011104156246A CN 201110415624 A CN201110415624 A CN 201110415624A CN 102410974 A CN102410974 A CN 102410974A
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Abstract
The invention discloses an on-line measurement method for particle size distribution and shape distribution of granules in an airflow conveying pipe, and belongs to the technical field of on-line measurement of gas-solid phase flow. The on-line measurement method comprises the following steps: in the gas-solid phase fluid pipe, irradiating three sections in a granular flow field at the same time by three pulse laser sheet sources with different spectrums, and capturing RGB (red, green and blue) images of the flowing granules on the three illuminated sections of the flow field at the same time by adopting an RGB digital camera; and decomposing the RGB image of each frame and respectively processing three sub-images by an image processing method so as to obtain particle size distribution and shape distribution of the measured granules. The on-line measurement method has the beneficial effects that the images of the granules on three different sections of the flow field can be acquired at the same time by adopting three lasers with different spectrums, the RGB camera and a telecentric lens; imaging on a plurality of focusing surfaces can be realized simultaneously; and the exposure time of the camera can be controlled by means of pulse feedback of the lasers so as to realize imaging of the flowing granules, thus greatly lowering the complexity of a measuring device and improving the measurement efficiency.
Description
Technical field
The invention belongs to Dual-Phrase Distribution of Gas olid line Measurement Technique scope, particularly based on particulate material size-grade distribution and distribution of shapes On-line Measuring Method in a kind of airflow pipeline of three look laser instruments and the shooting of RGB digital camera.
Background technology
It is a kind of effective ways that utilize air-flow conveying granular solid in pipeline that strength is carried, and is an important technology in the present industrial processes, is widely used in the pellet of various industrial sectors, the conveying and the drying process of powder.An exemplary is the pipeline transportation of solid fuel such as coal dust etc. in the fuel-burning power plant.The coal dust that comes out from coal pulverizer is carried by pressurized air supplies with many conveyance conduits simultaneously, gets into the burner array then in the burner hearth internal combustion.The distribution of pulverized coal particle granularity and the efficient of burning and pollutant discharge amount have close getting in touch.Yet the serviceability of coal pulverizer and the physical characteristics of coal etc. are depended in the distribution of pulverized coal particle granularity.In recent years, the coal-burning power plant of countries in the world begins to adopt coal dust and living beings burning technology altogether, to reduce emission of carbon-dioxide.Many power plant all adopt generating power with biomass combustion.Many living beings such as stalk etc. are bigger than pulverized coal particle, and are irregularly shaped, so biomass combustion or coal dust and living beings are burnt altogether with pure coal dust firing and are very different.The burning of bulky grain and irregular fuel particle can directly have influence on the discharge capacity of burning efficiency and pollutant.Fuel granularity is excessive or cross detailed rules and regulations and can cause incomplete combustion or the increase of coal pulverizer energy consumption etc., can cause line clogging when serious, by forced-stopping machine, causes heavy losses to power plant.Therefore, the particle size distribution and the distribution of shapes of power plant's coal dust and living beings are carried out the on-line continuous detection, help to improve the security and the burning efficiency of boiler combustion, reduce pollutant emission.
Existing particle sizing imaging device is general to adopt cross section, a flow field in the single laser illumination pipeline, so can only obtain a width of cloth particle image.As go for the size-grade distribution and the distribution of shapes of particle in the whole pipe, can adopt the particle illuminating device and complicated optical module of scan-type on the principle.Yet such design cost is high, and system complex and efficient are low, and poor reliability is difficult to safeguard.The present invention utilizes the differentiable characteristic of RGB digital camera R (redness) G (green) B (blueness) picture signal; Shine the particle flow field simultaneously through RGB three look pulse laser sheet lasers; The image of flow particles on the cross section, three flow fields that utilizes RGB digital camera and telecentric mirror head to absorb simultaneously to be illuminated; Greatly reduce the complicacy of device, improved efficiency of measurement and reliability.The present invention is not only applicable to the continuous on-line monitoring of pulverized coal particle stream in the fuel-burning power plant, is applicable to the on-line monitoring of industrial process of pneumatic transmission such as food, cement, iron and steel yet.
Summary of the invention
The purpose of this invention is to provide particulate material size-grade distribution and distribution of shapes On-line Measuring Method in a kind of airflow pipeline; It is characterized in that; Based on adopting three look laser instruments and RGB digital camera image capturing system, particulate material size-grade distribution and distribution of shapes on-line measurement comprise in the airflow pipeline:
1) constitutes grain flow imaging and image collecting device by three pulse laser mating plates with different spectrum, RGB digital camera and telecentric mirror head; Wherein, the laser mating plate is three color chips shape laser beam;
2) in Dual-Phrase Distribution of Gas olid body pipeline, shine the particle flow field simultaneously with the pulse laser mating plate of three different spectrum, the RGB image of flow particles on the cross section, three flow fields that utilizes RGB digital camera and telecentric mirror head to take simultaneously to be illuminated;
3) each frame RGB picture breakdown is become and three pairing R of laser spectrum (redness), G (green) and B (blueness) three width of cloth subimages, thus obtain the image of solid particle on the cross section, three flow fields of fluid line simultaneously;
4) three width of cloth subimages are handled, thus the size-grade distribution and the distribution of shapes of acquisition particle.
Said pulse laser sheet with different spectrum covers the purpose that complete particle does not have overlapping particle in order to reach in the laser sheet, and the thickness of laser sheet should be in 0.5 to 1.5 times of scope of the maximum particle diameter of survey particle; Three laser sheets should be arranged in parallel, and the distance between two laser sheets is chosen between 10 to 15 times of maximum particle diameter of the particle of surveying.
The angle [alpha] that angle beta between the optical axis of said camera and the laser mating plate is chosen between 90 ° of laser mating plates and the pipeline center's axle should be in 45 ° to 60 ° scope.
The telecentric mirror head of said RGB digital camera configuration is to be used to be implemented in obtain solid particle image clearly on three focusing surfaces simultaneously.
Said RGB digital camera is the time shutter of utilizing laser pulse signal feedback control camera, rather than uses the shutter of camera, thereby realizes the digital imagery of flow particles, and has greatly reduced the requirement to camera, has reduced cost.
The invention has the beneficial effects as follows under the situation that only adopts a RGB camera; Each frame RGB picture breakdown is become and three pairing R of laser spectrum (redness); G (green) and B (blueness) three width of cloth subimages, thus the image of particle on the cross section, three flow fields obtained in the fluid line simultaneously.Three width of cloth solid particle images are carried out Space Reconstruction, obtain the space distribution of solid particle in tested zone, flow field.Three width of cloth subimages are carried out Treatment Analysis, thereby obtain the size-grade distribution and the distribution of shapes of particle.And greatly reduced requirement to camera, reduced cost.
Description of drawings
Fig. 1 is particulate material size-grade distribution and distribution of shapes on-line measurement apparatus structure and principle schematic.
Among the figure:
1, particle flow field, 2, laser mating plate (three color chips shape laser beam), 3, red (R) laser instrument,
4, green (G) laser instrument, 5, blue (B) laser instrument, 6, the RGB digital camera,
7, telecentric mirror head 8, laser instrument control module 9, image processing system
10, Dual-Phrase Distribution of Gas olid pipeline.Angle between α-laser array and the pipeline, angle between β-RGB digital camera and the pipeline, the distance between the d-laser instrument.
Embodiment
The present invention provides particulate material size-grade distribution and distribution of shapes On-line Measuring Method in a kind of airflow pipeline.Employing as image collecting device, is carried out on-line measurement to particulate material size-grade distribution and distribution of shapes in the airflow pipeline based on three look laser instruments and RGB digital camera.Explain of the present invention below in conjunction with Fig. 1:
At first; Laser instrument by three different spectrum; Promptly red (R) laser instrument 3, green (G) laser instrument 4, blue (B) laser instrument 5, RGB digital camera 6 is formed the imaging system in particle flow field 1 with telecentric mirror head (telecentric lens) 7, and is installed on the tested Dual-Phrase Distribution of Gas olid body pipeline 10.Cover the purpose that complete particle does not have overlapping particle in order to reach in the laser sheet, the thickness of laser mating plate 2 sheet laser should be in 0.5 to 1.5 times of scope of the maximum particle diameter of survey particle.Three laser sheets should be arranged in parallel, and the distance between adjacent two laser sheets is chosen between 10 to 15 times of maximum particle diameter of tested particle.Angle beta between the optical axis of RGB digital camera 6 and the laser mating plate 2 is chosen for 90 °.Angle [alpha] between laser mating plate 2 and the pipeline center's axle should be in 45 ° to 60 ° scope.
Three laser instruments send three sheet laser beam mating plates by 8 controls of laser instrument control module, i.e. red (R), green (G) and blue (B).RGB camera 6 formed images when realizing the digital imagery of flow particles and adopting telecentric mirror head (telecentric lens) 7 to realize on a plurality of focusing surfaces in the time shutter (not being to use the shutter of camera) of laser instrument control module 8 control cameras; Thereby collect the RGB image in particle flow field 1 of the solid particle in cross section, three different flow fields.
The RGB picture signal in particle flow field 1 is imported image processing system 9 into and is decomposed, and obtains and three pairing R of laser mating plate, G and B three width of cloth particle subimages.To three width of cloth images respectively Treatment Analysis can obtain particle size distribution and distribution of shapes on three cross sections of pipeline, and show through user interface of software.The granularity of particle is to be confirmed by the equivalent diameter of particle (promptly having the diameter with the circular granular of homalographic); Coating of particles is to be confirmed by the maximum gauge of particle and the ratio of minimum diameter (being length breadth ratio); Size-grade distribution and distribution of shapes are obtained by the statistics under the time average meaning.In real-time monitoring system, the granularity of particle and distribution of shapes information are presented in the user interface, have statistical significance when size when the particle number in the user interface is accumulated to, with the statistical information output of whole user interface.And according to the renewal result of the particle information that newly advances, thereby realize on-line real time monitoring.
Claims (7)
1. particulate material size-grade distribution and distribution of shapes On-line Measuring Method in the airflow pipeline; It is characterized in that; Based on adopting three look laser instruments and RGB digital camera image capturing system, particulate material size-grade distribution and distribution of shapes on-line measurement in the airflow pipeline comprise:
1) constitutes grain flow imaging and image collecting device by three pulse laser sheet lasers with different spectrum, RGB digital camera and telecentric mirror head;
2) in Dual-Phrase Distribution of Gas olid body pipeline, shine the particle flow field simultaneously with the pulse laser sheet laser of three different spectrum, the RGB image of flow particles on the cross section, three flow fields that utilizes RGB digital camera and telecentric mirror head to take simultaneously to be illuminated;
3) each frame RGB picture breakdown is become and three pairing R of laser spectrum (redness), G (green) and B (blueness) three width of cloth subimages, thus obtain the image of solid particle on the cross section, three flow fields of fluid line simultaneously;
4) three width of cloth subimages are handled, thus the size-grade distribution and the distribution of shapes of acquisition particle.
2. according to particulate material size-grade distribution and distribution of shapes On-line Measuring Method in the said airflow pipeline of claim 1; It is characterized in that; Said pulse laser sheet with different spectrum; Cover the purpose that complete particle does not have overlapping particle in order to reach in the laser sheet, the thickness of laser sheet should be in 0.5 to 1.5 times of scope of the maximum particle diameter of survey particle; Three laser sheets should be arranged in parallel, and the distance between two laser sheets is chosen between 10 to 15 times of maximum particle diameter of the particle of surveying.
3. according to particulate material size-grade distribution and distribution of shapes On-line Measuring Method in the said airflow pipeline of claim 1; It is characterized in that the angle [alpha] that the angle beta between the optical axis of said camera and the laser mating plate is chosen between 90 ° of laser sheets and the pipeline center's axle should be in 45 ° to 60 ° scope.
4. according to particulate material size-grade distribution and distribution of shapes On-line Measuring Method in the said airflow pipeline of claim 1; It is characterized in that the telecentric mirror head of said RGB digital camera configuration is to be used to be implemented in obtain solid particle image clearly on three focusing surfaces simultaneously.
5. according to particulate material size-grade distribution and distribution of shapes On-line Measuring Method in the said airflow pipeline of claim 1; It is characterized in that; Said RGB digital camera is the time shutter of utilizing laser pulse signal feedback control camera, rather than uses the shutter of camera, thereby realizes the digital imagery of flow particles; And greatly reduced requirement to camera, reduced cost.
6. according to particulate material size-grade distribution and distribution of shapes On-line Measuring Method in the said airflow pipeline of claim 1; It is characterized in that; Particle image on the cross section, three width of cloth flow fields of gained is carried out Treatment Analysis; Obtain the size-grade distribution and the distribution of shapes of the particle on three cross sections of pipeline, and show through user interface of software.
7. according to particulate material size-grade distribution and distribution of shapes On-line Measuring Method in the said airflow pipeline of claim 1, it is characterized in that the granularity of particle is confirming by particle; Coating of particles is recently to be confirmed by the ratio of the maximum gauge of particle and minimum diameter or length and width; Size-grade distribution and distribution of shapes are to be obtained by the statistics under the time average meaning; Wherein equivalent diameter promptly has the diameter with the circular granular of homalographic.
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Cited By (15)
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| CN105043946A (en) * | 2015-07-08 | 2015-11-11 | 浙江大学 | Dual-wavelength based scattering angle self-calibration full-field rainbow measurement method and device |
| CN105928841A (en) * | 2016-04-19 | 2016-09-07 | 中国科学院过程工程研究所 | Immersion on-line multiphase measuring instrument and measuring method |
| RU2613903C2 (en) * | 2015-06-11 | 2017-03-21 | Шлюмберже Текнолоджи Б.В. | Method of quantitative analysis for distribution of contaminant particles which infiltrated in porous medium during filtration |
| CN106644852A (en) * | 2016-10-17 | 2017-05-10 | 哈尔滨工业大学 | Measuring method capable of acquiring optical constants and particle size distribution of spherical particles simultaneously on basis of ultrashort pulse laser irradiation |
| CN107014720A (en) * | 2017-05-24 | 2017-08-04 | 浙江大学 | A kind of online in site measurement probe of grain graininess |
| CN107091796A (en) * | 2017-06-14 | 2017-08-25 | 中央民族大学 | The optical system that across particle diameter size granule level is matched somebody with somebody and its is distributed in a kind of measurement pipe stream |
| CN108489872A (en) * | 2018-03-23 | 2018-09-04 | 奥星制药设备（石家庄）有限公司 | Online granularity monitoring method and system |
| CN109781590A (en) * | 2018-12-29 | 2019-05-21 | 南京航空航天大学 | It is a kind of complexity sand dust simplification and characteristic feature shape construction method |
| CN109990834A (en) * | 2019-03-27 | 2019-07-09 | 东南大学 | High-temperature flight particle temperature, speed, partial size in-situ measuring method |
| CN110057650A (en) * | 2019-05-20 | 2019-07-26 | 常德力元新材料有限责任公司 | The evaluation method of steel band crystal grain |
| CN111624140A (en) * | 2020-05-18 | 2020-09-04 | 武汉理工大学 | Device and method for measuring distribution of pulverized coal leakage flow field |
| CN111811776A (en) * | 2020-07-20 | 2020-10-23 | 北京航空航天大学 | Method and system for measuring spray flow field |
| CN112102319A (en) * | 2020-11-17 | 2020-12-18 | 常州市瑞泰光电有限公司 | Dirty image detection method, dirty image detection device, and dirty image detection mechanism |
| CN113526165A (en) * | 2021-07-15 | 2021-10-22 | 神华北电胜利能源有限公司 | Coal pulverizer discharge system |
| CN114199754A (en) * | 2021-11-17 | 2022-03-18 | 柳州舜泽尔汽车零部件有限公司 | Method for detecting cleanliness of national six-carbon canister of automobile |
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| RU2613903C2 (en) * | 2015-06-11 | 2017-03-21 | Шлюмберже Текнолоджи Б.В. | Method of quantitative analysis for distribution of contaminant particles which infiltrated in porous medium during filtration |
| US9951613B2 (en) | 2015-06-11 | 2018-04-24 | Schlumberger Technology Corporation | Method for quantitative analysis of a distribution of solid particles of a suspension invaded in a porous medium during filtration |
| CN105043946B (en) * | 2015-07-08 | 2017-12-15 | 浙江大学 | Angle of scattering self-calibration whole audience rainbow measuring method and device based on dual wavelength |
| CN105043946A (en) * | 2015-07-08 | 2015-11-11 | 浙江大学 | Dual-wavelength based scattering angle self-calibration full-field rainbow measurement method and device |
| CN105928841A (en) * | 2016-04-19 | 2016-09-07 | 中国科学院过程工程研究所 | Immersion on-line multiphase measuring instrument and measuring method |
| CN106644852A (en) * | 2016-10-17 | 2017-05-10 | 哈尔滨工业大学 | Measuring method capable of acquiring optical constants and particle size distribution of spherical particles simultaneously on basis of ultrashort pulse laser irradiation |
| CN107014720A (en) * | 2017-05-24 | 2017-08-04 | 浙江大学 | A kind of online in site measurement probe of grain graininess |
| CN107091796A (en) * | 2017-06-14 | 2017-08-25 | 中央民族大学 | The optical system that across particle diameter size granule level is matched somebody with somebody and its is distributed in a kind of measurement pipe stream |
| CN108489872A (en) * | 2018-03-23 | 2018-09-04 | 奥星制药设备（石家庄）有限公司 | Online granularity monitoring method and system |
| CN108489872B (en) * | 2018-03-23 | 2022-03-04 | 奥星制药设备（石家庄）有限公司 | Online granularity monitoring method and system |
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| CN109781590A (en) * | 2018-12-29 | 2019-05-21 | 南京航空航天大学 | It is a kind of complexity sand dust simplification and characteristic feature shape construction method |
| CN109990834A (en) * | 2019-03-27 | 2019-07-09 | 东南大学 | High-temperature flight particle temperature, speed, partial size in-situ measuring method |
| CN110057650A (en) * | 2019-05-20 | 2019-07-26 | 常德力元新材料有限责任公司 | The evaluation method of steel band crystal grain |
| CN110057650B (en) * | 2019-05-20 | 2022-03-15 | 常德力元新材料有限责任公司 | Method for evaluating steel strip crystal grains |
| CN111624140A (en) * | 2020-05-18 | 2020-09-04 | 武汉理工大学 | Device and method for measuring distribution of pulverized coal leakage flow field |
| CN111624140B (en) * | 2020-05-18 | 2021-08-17 | 武汉理工大学 | Device and method for measuring distribution of pulverized coal leakage flow field |
| CN111811776A (en) * | 2020-07-20 | 2020-10-23 | 北京航空航天大学 | Method and system for measuring spray flow field |
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Application publication date: 20120411 |