CN108414408B - Coaxial full-field rainbow liquid drop measuring probe with compact structure - Google Patents
Coaxial full-field rainbow liquid drop measuring probe with compact structure Download PDFInfo
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- CN108414408B CN108414408B CN201810233166.6A CN201810233166A CN108414408B CN 108414408 B CN108414408 B CN 108414408B CN 201810233166 A CN201810233166 A CN 201810233166A CN 108414408 B CN108414408 B CN 108414408B
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- 239000000523 sample Substances 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 title claims abstract description 12
- 239000013307 optical fiber Substances 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 16
- 238000009423 ventilation Methods 0.000 claims description 16
- 239000000112 cooling gas Substances 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000002002 slurry Substances 0.000 abstract description 20
- 238000006477 desulfuration reaction Methods 0.000 abstract description 14
- 230000023556 desulfurization Effects 0.000 abstract description 14
- 238000012625 in-situ measurement Methods 0.000 abstract description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 4
- 229910001425 magnesium ion Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
Classifications
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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
- G01N15/0227—Investigating particle size or size distribution by optical means using imaging; using holography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- 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
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
-
- 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
- G01N21/84—Systems specially adapted for particular applications
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to a liquid drop measuring technology, and aims to provide a coaxial full-field rainbow liquid drop measuring probe with a compact structure. The optical path system comprises a front lens, a rear lens and a disc with a central hole which are sequentially arranged in a lens sleeve, and a digital camera with a fixed focus lens is arranged behind the disc; an optical fiber collimator parallel to the axis of the lens sleeve is fixed at the edge of the disc, and the transmitting end of the optical fiber collimator is aligned with the through hole on the rear lens; the distance between the front lens and the rear lens is smaller than the focal length of the two lenses, the equivalent image space focal plane of the two lenses is positioned between the rear lens and the focal plane of the rear lens, and the center hole of the disc is positioned at the image space focal point of the rear lens; the parameters of the fixed focus lens should ensure that a clear rainbow image at the focal plane of the front lens and the rear lens equivalent image is recorded. The coaxial type rainbow probe has the advantages that the coaxial type design is adopted, so that the axial size of the full-field rainbow probe is greatly reduced, the weight of the probe is reduced, and the probe is convenient to use. The in-situ measurement of various parameters of slurry drops and fog drops of the desulfurization system can be realized.
Description
Technical Field
The invention relates to a liquid drop measuring technology, in particular to a coaxial full-field rainbow liquid drop measuring probe with a compact structure. The probe is based on a double lens and a camera with a fixed-focus lens, and is used for measuring parameters such as particle size distribution, refractive index, temperature (or components) and the like of slurry drops or fog drops in a desulfurization system of a power plant.
Background
Today, where environmental pollution problems are becoming serious, clean utilization of coal is a trend. The pollutants produced by the combustion of coal include sulfur dioxide, nitrogen oxides, inhalable particulates, heavy metals, polycyclic aromatic hydrocarbons and the like. Sulfur dioxide is one of the main pollutants, which can cause acid rain, corrode vegetation and buildings, and also harm human health. In China, the lime-gypsum method is the most widely applied sulfur dioxide removal technology of power plants, slurry drops in a desulfurization system are mixed with flue gas, and parameters such as temperature, particle size distribution, components and the like have great influence on sulfur dioxide removal efficiency. At present, the measurement of slurry drops is only to measure the content of slurry drops in flue gas at a demister outlet: one method is to consider the concentration of magnesium ions in the slurry drop pool and the concentration of magnesium ions in the slurry drops at the outlet of the demister to be equal, measure the content of magnesium ions in the slurry drops by adopting a constant-speed sampling method and a magnesium ion titration method, and then calculate the quantity of the drops. The other method is to adopt constant-speed sampling to lead the flue gas to pass through a primary trapping device and a secondary trapping device, and the flue gas is respectively weighed before and after drying after sampling, and the difference between the flue gas and the secondary trapping device is the quantity of liquid drops.
However, there are currently few effective measurement methods for slurry droplets in the spray zone, and the amount of slurry droplets is difficult to adequately reflect the effect of slurry droplets on desulfurization. Rainbow scattering techniques typically require the use of larger diameter lenses to achieve a larger scattered light acceptance range to ensure accuracy of the parameter inversion. However, the probe with larger axial dimension is difficult to extend into the measuring hole of the desulfurization system, which is unfavorable for practical application of engineering. If the invention is used, the in-situ measurement of the parameters such as the particle size distribution, the refractive index, the temperature (component) and the like of slurry drops of the desulfurization system can be realized, and the in-situ measurement is significant for further researching the influence of the slurry drop parameters on the desulfurization efficiency and improving the atomization of the slurry drops, thereby improving the wet desulfurization efficiency and creating conditions for further researching multiphase flow in the desulfurization system.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing the coaxial full-field rainbow liquid drop measuring probe with a compact structure.
In order to solve the technical problems, the invention adopts the following technical scheme:
the coaxial full-field rainbow liquid drop measuring probe with a compact structure is provided, and comprises an optical path system and a digital camera; the optical path system comprises a front lens, a rear lens and a disc with a central hole which are sequentially arranged in a lens sleeve, and a digital camera with a fixed focus lens is arranged behind the disc; an optical fiber collimator parallel to the axis of the lens sleeve is fixed at the edge of the disc, and the transmitting end of the optical fiber collimator is aligned with the through hole on the rear lens; the distance between the front lens and the rear lens is smaller than the focal length of the two lenses, the equivalent image space focal plane of the two lenses is positioned between the rear lens and the focal plane of the rear lens, and the center hole of the disc is positioned at the image space focal point of the rear lens; the parameters of the fixed focus lens should ensure that a clear rainbow image at the focal plane of the front lens and the rear lens equivalent image is recorded.
In the invention, the front lens is an aspheric lens, the diameter is D, and the focal length is f 1 ，D/f 1 >0.77; the rear lens is a spherical lens with the diameter of D and the focal length of f 2 The method comprises the steps of carrying out a first treatment on the surface of the Diameter d of the through hole>3mm, located 0.3D from the rear lens center.
In the invention, a front lens and a rear lens are respectively embedded in a clamping ring; the lens sleeve is provided with internal threads, and the clamping ring and the circular disc are arranged in the lens sleeve through external threads at the edges of the clamping ring and the circular disc.
In the invention, a semicircular hole is formed on the side surface of a lens sleeve, and a ventilation sleeve is eccentrically welded on the outer side of the lens sleeve; one end of the ventilation sleeve is connected to the semicircular hole and used for enabling the protective gas from the ventilation sleeve to enter the lens sleeve, and the other end of the ventilation sleeve is connected with the hose and used for being connected with the protective gas.
In the invention, the optical fiber collimator is provided with an inseparable tail fiber and is fixed on the edge of the disc by three screws.
In the invention, the image sensor of the digital camera is CCD or CMOS, the photosensitive unit is a linear array or an area array, and the transverse resolution is not less than 1k.
The invention also comprises an extension sleeve, the front end of which is connected to the rear end of the lens sleeve in a threaded connection manner; the extension sleeve is of a double-layer structure, a channel for introducing cooling gas is arranged between the outer tube and the inner tube, and a cooling gas inlet is arranged at the rear end of the outer tube; the tail fiber of the optical fiber collimator and the power line and the data line of the digital camera are arranged in the inner tube, and the rear end of the inner tube is provided with a cooling gas outlet.
In the present invention, the lens sleeve, the disc, the extension sleeve are made of an acid corrosion resistant material, and the shielding gas hose may also be arranged in the inner tube.
Compared with the prior art, the invention has the beneficial effects that:
1. the probe can realize in-situ measurement of parameters such as particle size distribution, refractive index, temperature (components) and the like of slurry drops and fog drops of the desulfurization system, and has important significance for further researching the influence of slurry drop parameters on desulfurization efficiency and improving atomization of slurry drops, thereby improving wet desulfurization efficiency and creating conditions for further researching multiphase flow in the desulfurization system.
2. The small-size full-field rainbow probe fully considers the portability requirement of practical engineering application, and greatly reduces the axial size of the full-field rainbow probe by adopting the coaxial design on the premise of a certain lens size, thereby reducing the weight of the probe and facilitating engineering use.
Drawings
Fig. 1 is a diagram of coaxial full-field rainbow probe light paths.
Fig. 2 is an exploded view of a coaxial full field rainbow probe structure.
Fig. 3 is a schematic view of an extension sleeve.
The optical fiber collimator is shown in the figure 1; 2 front lens; 3 a rear lens; 4, a disc; 5, fixing a focus lens; 6, a digital camera; 7 a lens sleeve; 8 snap rings; 9 screws; 10 a cooling gas inlet; 11 inner tubes; an outer tube 12.
Detailed Description
The following is a further detailed description taken in conjunction with the accompanying drawings:
the coaxial full-field rainbow liquid drop measuring probe comprises an optical path system, a front lens 2, a rear lens 3 and a disc 4 with a central hole, wherein the front lens 2, the rear lens 3 and the disc 4 are sequentially arranged in a lens sleeve 7, and a 5 digital camera 6 with a fixed focus lens is arranged behind the disc 4; the front lens 2 and the rear lens 3 are respectively embedded in a clamping ring 8, the lens sleeve 7 is provided with internal threads, and the clamping ring 8 and the disc 4 are arranged in the lens sleeve 7 through external threads at the edges of the clamping ring 8 and the disc 4 respectively. The front lens 2 is an aspheric lens with a diameter D and a focal length f 1 ，D/f 1 >0.77; the rear lens 3 is a spherical lens with a diameter D and a focal length f 2 The method comprises the steps of carrying out a first treatment on the surface of the The rear lens 3 is provided with a diameter d>A 3mm through hole located 0.3D from the center of the rear lens 3. A fiber collimator 1 parallel to the axis of the lens sleeve 7 is fixed to the edge of the disc 4 with its emitting end aligned with the through hole in the rear lens 3. The fiber collimator is provided with inseparable tail fibers and is fixed on the edge of the disc by three screws 9, and the three screws 9 can conveniently adjust the left-right dip angle and the pitch angle of the fiber collimator 1. The image sensor of the digital camera 6 is CCD or CMOS, the photosensitive unit is linear array or area array, and the transverse resolution is not less than 1k.
Since a purge with a shielding gas is required to avoid contamination of the front lens 2 by slurry droplets. A semicircular hole is formed in the side face of the lens sleeve 7, and a ventilation sleeve is eccentrically welded to the outer side of the lens sleeve 7. One end of the ventilation sleeve is connected to the semicircular hole and is used for enabling the protective gas from the ventilation sleeve to enter the lens sleeve; the other end of the ventilation sleeve is connected with a hose for accessing the protective gas. The shielding gas enters from the rear end and is transported along the ventilation sleeve to the front of the front lens 2 for purging.
The side semicircle hole of the lens sleeve 7 is provided at the lower half of the side wall of the lens sleeve and is an elongated through hole for letting the protection gas from the ventilation sleeve into the inside of the lens sleeve in the radial direction to protect the lens from contamination. The semicircular hole is used for reducing the radial size of the whole probe as much as possible, the ventilation sleeve is eccentric downwards, only the lower half part is provided with the shielding gas, and the shielding gas inlet at the rear end of the ventilation sleeve is also arranged at the lower part. The choice of downward deflection rather than upward is made by designing the shield gas inlet of the lens sleeve 7 in the lower part so that the shield gas flow is directed obliquely upward, considering that the slurry droplets enter the probe from obliquely upward as a whole.
In view of the high temperatures of the use scenario, which may affect the internal components, an extension sleeve is also designed, the front end of which is screwed to the rear end of the lens sleeve 7. The extension sleeve is of a double-layer structure, a channel for introducing cooling gas is arranged between the outer tube 12 and the inner tube 11, and the cooling gas inlet 10 is arranged at the rear end of the outer tube 12; the tail fiber of the optical fiber collimator 1, the power line, the data line and the protective gas hose of the digital camera are all arranged in the inner tube 11, and the rear end of the inner tube 11 is provided with a cooling gas outlet. The cooling gas enters from the cooling gas inlet 10, reaches the front end along the passage between the outer tube 12 and the inner tube 11, cools the fiber collimator 1 and the camera 6, and then leaves the probe in the opposite direction along the inner tube 11, and cools the camera power line, the data line, the optical fiber and the protection gas hose. In addition, the length of the whole probe can be increased by extending the sleeve, so that the probe can extend into the center of the desulfurization system to measure slurry drop parameters.
The light path arrangement requires: the distance between the front lens 2 and the rear lens 3 is smaller than the focal length of the two lenses, the equivalent image space focal plane of the two lenses is positioned between the focal planes of the rear lens 2 and the rear lens 3, and the central hole of the disc 4 is positioned at the image space focal point of the rear lens 3; the parameters of the fixed focus lens 5 should be such that a clear rainbow image at the equivalent image-side focal plane of the front lens 2 and the rear lens 3 can be recorded. The laser emitted by the optical fiber collimator 1 horizontally passes through the through hole of the rear lens 3, is converged to the focus of the front lens 2 by the front lens 2, and the liquid drops at the focus are mutually interfered by internal reflection beams once to form interference fringes, are collected by the front lens 2, are converted into parallel light again, are converged by the rear lens 3 and pass through the center hole of the disc 4 arranged at the focus of the rear lens 3, enter the fixed focus lens 5, and represent clear full-field rainbow images on the target surface of the digital camera 6.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (4)
1. A coaxial full-field rainbow liquid drop measuring probe with compact structure comprises an optical path system and a digital camera; the optical path system is characterized by comprising a front lens, a rear lens and a disc with a central hole, wherein the front lens, the rear lens and the disc with a central hole are sequentially arranged in a lens sleeve, and a digital camera with a fixed focus lens is arranged behind the disc; an optical fiber collimator parallel to the axis of the lens sleeve is fixed at the edge of the disc, and the transmitting end of the optical fiber collimator is aligned with the through hole on the rear lens; the distance between the front lens and the rear lens is smaller than the focal length of the two lenses, the equivalent image space focal plane of the two lenses is positioned between the rear lens and the focal plane of the rear lens, and the center hole of the disc is positioned at the image space focal point of the rear lens; parameters of the fixed-focus lens should ensure that clear rainbow images at the focal plane of the equivalent image of the front lens and the rear lens can be recorded;
the front lens and the rear lens are respectively embedded in the clamping ring; the lens sleeve is provided with internal threads, and the clamping ring and the disc are arranged in the lens sleeve through external threads at the edges of the clamping ring and the disc; a semicircular hole is formed in the side face of the lens sleeve, and a ventilation sleeve is eccentrically welded on the outer side of the lens sleeve; one end of the ventilation sleeve is connected to the semicircular hole and is used for enabling the protective gas from the ventilation sleeve to enter the lens sleeve, and the other end of the ventilation sleeve is connected with the hose and is used for being connected with the protective gas;
the fiber collimator is provided with an inseparable tail fiber and is fixed on the edge of the disc by three screws.
2. The probe of claim 1, wherein the front lens is an aspherical lens having a diameter D and a focal length f 1 ，D/f 1 >0.77; the rear lens is a spherical lens with the diameter of D and the focal length of f 2 The method comprises the steps of carrying out a first treatment on the surface of the Diameter d of the through hole>3mm, located 0.3D from the rear lens center.
3. The probe according to claim 1, wherein the image sensor of the digital camera is a CCD or CMOS, the photosensitive unit is a linear array or an area array, and the lateral resolution is not less than 1k.
4. The probe of claim 1, further comprising an elongated sleeve having a forward end threadably coupled to a rearward end of the lens sleeve; the extension sleeve is of a double-layer structure, a channel for introducing cooling gas is arranged between the outer tube and the inner tube, and a cooling gas inlet is arranged at the rear end of the outer tube; the tail fiber of the optical fiber collimator and the power line and the data line of the digital camera are arranged in the inner tube, and the rear end of the inner tube is provided with a cooling gas outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810233166.6A CN108414408B (en) | 2018-03-21 | 2018-03-21 | Coaxial full-field rainbow liquid drop measuring probe with compact structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810233166.6A CN108414408B (en) | 2018-03-21 | 2018-03-21 | Coaxial full-field rainbow liquid drop measuring probe with compact structure |
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| Publication Number | Publication Date |
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| CN108414408A CN108414408A (en) | 2018-08-17 |
| CN108414408B true CN108414408B (en) | 2024-02-20 |
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| CN201810233166.6A Active CN108414408B (en) | 2018-03-21 | 2018-03-21 | Coaxial full-field rainbow liquid drop measuring probe with compact structure |
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| CN110068398B (en) * | 2019-05-08 | 2023-11-24 | 陕西科技大学 | Measuring device and method for photo-thermal temperature rise of noble metal nanoparticle solution |
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|---|---|---|---|---|
| CN103698256A (en) * | 2013-12-25 | 2014-04-02 | 浙江大学 | Method and device for on-line measurement of liquid spraying through full-field rainbow |
| CN104865189A (en) * | 2015-05-28 | 2015-08-26 | 天津大学 | Drop analyzer based on adjustable light path and anti-jamming device |
| CN204789239U (en) * | 2015-07-08 | 2015-11-18 | 浙江大学 | Angle of scattering is from maring whole audience rainbow measuring device based on dual wavelength |
| CN106124369A (en) * | 2016-06-08 | 2016-11-16 | 浙江大学 | A kind of close-coupled whole audience rainbow measuring probe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4197994B2 (en) * | 2003-06-19 | 2008-12-17 | コニカミノルタオプト株式会社 | Imaging device |
| US7835000B2 (en) * | 2006-11-03 | 2010-11-16 | Los Alamos National Security, Llc | System and method for measuring particles in a sample stream of a flow cytometer or the like |
| US20170292534A1 (en) * | 2016-04-12 | 2017-10-12 | General Electric Company | Moisture detection system for gas turbine inlet |
-
2018
- 2018-03-21 CN CN201810233166.6A patent/CN108414408B/en active Active
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|---|---|---|---|---|
| CN103698256A (en) * | 2013-12-25 | 2014-04-02 | 浙江大学 | Method and device for on-line measurement of liquid spraying through full-field rainbow |
| CN104865189A (en) * | 2015-05-28 | 2015-08-26 | 天津大学 | Drop analyzer based on adjustable light path and anti-jamming device |
| CN204789239U (en) * | 2015-07-08 | 2015-11-18 | 浙江大学 | Angle of scattering is from maring whole audience rainbow measuring device based on dual wavelength |
| CN106124369A (en) * | 2016-06-08 | 2016-11-16 | 浙江大学 | A kind of close-coupled whole audience rainbow measuring probe |
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| Title |
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