CN201477022U - Pulverized-coal fineness measuring device - Google Patents
Pulverized-coal fineness measuring device Download PDFInfo
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- CN201477022U CN201477022U CN2009201626943U CN200920162694U CN201477022U CN 201477022 U CN201477022 U CN 201477022U CN 2009201626943 U CN2009201626943 U CN 2009201626943U CN 200920162694 U CN200920162694 U CN 200920162694U CN 201477022 U CN201477022 U CN 201477022U
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- pulverized coal
- lens
- measurement device
- fineness measurement
- coal according
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Abstract
The utility model discloses a pulverized-coal fineness measuring device, which comprises an oscillation sample injector, a whirl-wind scattering device and a laser detection device, wherein the whirl-wind scattering device is formed by sequentially joining a vacuum generator, a whirl-wind scatter and a rectifying device for reducing the whirl air flow, an outlet of the oscillation sample injector is communicated with the vacuum generator, and the rectifying device is communicated with a test window in the laser detection device. Under the effect of the sample injector and the whirl-wind scattering device, the pulverized coal is adequately scattered, so the detection accuracy and repetitiveness are improved; and the rectifying device restricts the scattering angle of the air flow, so the measuring range and the measuring precision are improved.
Description
Technical field
The utility model relates to a kind of fineness measurement device for pulverized coal, particularly relates to a kind of laser method fineness measurement device for pulverized coal.
Background technology
Grain graininess is measured, and testing graininess method commonly used has: sieve method, microscopic method, sedimentation, Ku Ertefa, laser method, supercritical ultrasonics technology, air permeability method, electron microscopy etc.What at present, the measurement of fineness of pulverized coal was generally adopted is sieve method.
(1) sieve shaker sieve method fineness of pulverized coal is measured
The basic functional principle of this method is the testing sieve that the coal dust that takes by weighing certain mass places regulation, and screening calculates fineness of pulverized coal according to residual quality of pc on the sieve shaker fully on sieve shaker.
Equipment needed thereby comprises: sensibility reciprocal is the industrial balance of 0.01g; Mesh size is each one of the testing sieve of 200 μ m and 90 μ m, and is furnished with chassis and sieve lid; Vertical 150 times/min of vibration number of times, 220 times/min of horizontal rotation number of times or similar sieve shaker; The slot type riffle of enclosure-type; Stopwatch and banister brush.
Testing procedure: the sieve of chassis, aperture 90 μ m and aperture 200 μ m is overlaped from bottom to top successively; Take by weighing coal sample 25 grams (claiming accurate to 0.01g), placing the aperture is in the 200 μ m sieve, builds the sieve lid; Said apparatus is packed on the sieve shaker support, and the sieve 10min that shakes takes off sieve, is that the bottom surface of 90 μ m sieve once (prevents that fine particle from stopping up the hole of 90 μ m sieve) with brush brush aperture, loads onto the sieve sieve 5min that shakes again.(the sieve 2min if shake again when the coal dust amount is no more than 0.1g under the sieve, then thinks and sieves safety); Take off sieve, the weighing aperture is a residual coal dust amount on 200 μ m and the 90 μ m sieves respectively, claims accurate to 0.01g.
The result calculates:
Fineness of pulverized coal calculates by following formula:
In the formula:
R
200-do not account for the percentage of sample mass, % by the quality of pc of 200 μ m sieves
R
90-do not account for the percentage of sample mass, % by the quality of pc of 90 μ m sieves
A
200Quality of pc on-200 μ m sieves, g;
A
90Quality of pc on-90 μ m sieves, g.
(2) static light scattering granulometry principle: the static light scattering granulometry can make laser produce this physical phenomenon test size-grade distribution of scattering according to particle.Because laser has good monochromaticity and extremely strong directivity, so laser will shine the place of infinite distance in unencumbered infinite space, and the phenomenon of dispersing is arranged seldom in communication process.The MieShi scattering theory shows that when light beam runs into particulate blockage, scattering phenomenon will take place a part of light, the direction of propagation of scattered light will form an angle theta with the direction of propagation of main beam, the size at θ angle is relevant with the size of particle, and particle is big more, and the θ angle of the scattered light of generation is just more little; Particle is more little, and the θ angle of the scattered light of generation is just big more.Be that low-angle scattered light is caused by bulky grain; The scattered light of wide-angle is caused by granule.Studies show that further scattered intensity is represented the quantity of this particle diameter particle.Like this, measure the scattered intensity on the different angles, just can obtain the size-grade distribution of sample.
Implementation: follow the description among the sreen analysis laser diffractometry GB/T 19077.1-2008, with representational sample, after disperseing in suitable liquid or gas with suitable concentration, allow a branch of light (normally laser) by therebetween, after light is scattered, be distributed in different angles, receive relevant signal by multiunit detector clocklike, and calculate by suitable optical model and mathematical routine, draw the ratio of the shared cumulative volume of each granularity rank particle volume.
The shortcoming of above-mentioned two kinds of methods is as follows:
(1) shortcoming of sieve method: complex steps, speed is slow, low precision, the human factor influence is big, poor repeatability, automaticity is low.
(2) shortcoming measured at fineness of pulverized coal of existing laser method surveying instrument: the design of panel detector structure and software is not measured at fineness of pulverized coal specially; When wet method was measured, coal dust can produce the swelling phenomenon and cause measured value bigger than normal, and sample size is few, and is representative not enough; During drying measure, since coal dust itself have must viscosity and density less, contradiction between the angle of divergence of traditional injecting type dispersant system very difficult solution dispersancy and air-flow, this cause otherwise sample dispersion insufficient, accuracy of measuring and repeatability descend, the air-flow angle of divergence is excessive, has limited measurement range and precision.
So far, also do not find the special-purpose laser method measurement mechanism measured with the coal fineness of pulverized coal at electric power, particularly take into full account in design fineness of pulverized coal measure among the rule DL/T567.5-95 requirement and special little at coal dust density, have viscosity, should not disperse and physical characteristics such as cleaning and the diverting device that designs.
The utility model content
Be directed to this, the purpose of this utility model is, a kind of fineness measurement device for pulverized coal is provided, automaticity height, weak point consuming time, precision height, good reproducibility.
For achieving the above object, the technical scheme that the utility model provides is: a kind of fineness measurement device for pulverized coal, include vibration injector, whirlwind diverting device and laser detector, described whirlwind diverting device is connected in sequence by vacuum generator, whirlwind decollator and the fairing of subduing vortical flow, the outlet of described vibration injector is communicated with vacuum generator, and described fairing is communicated with testing window in the laser detector.
Described whirlwind diverting device also includes dust collect plant, and described dust collect plant is connected the below of testing window.
This fineness measurement device for pulverized coal also includes the data analysis treating apparatus, described data analysis treating apparatus includes the signal acquisition circuit that is connected with photoelectric detector array signal on the laser detector, and the single chip computer device that is electrically connected with described signal acquisition circuit.
Described fairing is formed by column pipe and the connection of column square tube, and described column pipe is communicated with the whirlwind decollator, and described column square tube is communicated with testing window.
The diameter of described column pipe is 4mm, and length is 50mm; Described column square tube is 30mm * 4mm, and length is 50mm.
Fourier transform lens in the described laser detector is arranged in order by the lens of two different falcates and a slice biconvex lens to be formed, a curved surface of all curved surfaces of described two meniscus shaped lenses and biconvex lens is the negative curvature face, and the positive curvature face of the concave surface of described two meniscus shaped lenses and biconvex lens is towards testing window.
The meniscus shaped lens of described centre and the focal length of biconvex lens are respectively 193.73mm and 231.47mm, and the focal length of another meniscus shaped lens is-153.76mm.
The meniscus shaped lens of described centre and biconvex lens all adopt refractive index n
632.8=1.79992 ZF7 glass is made; Described another meniscus shaped lens adopts refractive index n
632.8=1.48598 QK3 glass is made.
The radius-of-curvature of the lens of described two falcates and the curved surface of biconvex lens is followed successively by R
1, R
2, R
3, R
4, R
5, R
6, R wherein
1＜＜R
2, R
3＜R
4, R
5＞＞R
6
Photodetector in the described laser detector is made up of a series of silicon photocell arrays, and the center is an aperture that diameter is 45 μ m, four triangle detection devices of the symmetry that distributing around aperture; 38 60 ° fan-shaped detector in the cross arrangement of the aperture left and right sides, arranges 6 pairs of 30 ° of fan-shaped detectors, 12 contour fan-shaped detectors of the one-sided continuous arrangement of ragged edge continuously in its left-right symmetric then.
Compared with prior art, under the prerequisite of the measurement requirement of the utility model in satisfying fineness of pulverized coal measurement rule DL/T567.5-95, employing is based on the static light scattering method of MieShi theory, and designs for model according to the Fourier's light path (a) among the sreen analysis laser diffractometry GB/T19077.1-2008.What this method adopted is indirect measurement method, the automaticity height, and weak point consuming time, the precision height, good reproducibility, and utilize accompanying software can directly carry out correlation analysis and provide measurement report to data by computing machine.
Coal dust is disperseed fully through the effect of vibration injector and whirlwind diverting device, thereby has improved the accuracy and the repeatability that detect; And rectifying device restricts the angle of divergence of air-flow less, increased measurement range and precision.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the connection diagram of vibration injector and whirlwind diverting device;
Fig. 3 is the utility model measurement mechanism structural representation;
Fig. 4 is the structural representation of Fourier transform lens of the present utility model;
Fig. 5 is the structural representation of the detector for scattered light in the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in detail, the description of this part only is exemplary and explanatory, should any restriction not arranged to protection domain of the present utility model.
A kind of fineness measurement device for pulverized coal based on the static light scattering principle, involving vibrations injector 1 and whirlwind diverting device 2,4 three parts of measurement mechanism 3 and data analysis disposal system are formed, and one-piece construction is as shown in Figure 1.
(1) whirlwind diverting device 2 comprises vacuum generator 21, whirlwind decollator 22, fairing 23, testing window 33 and dust collect plant 24, as shown in Figure 2.
Whirlwind decollator 22 is made up of charging aperture, exhausr port, discharging opening and dispersion bucket.The pressurized air that goes out to be mixed with sample from the nozzle ejection of vacuum generator 21 tangentially enters in the separating barrel by the charging aperture of whirlwind decollator 22 with higher linear velocity, disperseing to form the downward outer eddy flow of rotation between tube and exhausr port, the particle that disperses wall is taken to whirlwind decollator bottom, arrive awl turns back upwards with identical rotation direction at the end, eddy flow in forming flows out from exhausr port to top.Particle is dished out to the wall direction by centrifugal action in inside and outside rotational flow field.In disperseing bucket, the suffered different centrifugal force of particle help dispersion of nano-particles, and simultaneously, the collision of particle and wall further disperses more tacky aggregate.Gas flows out from top like this, and scattered pulverized coal particle flows out from whirlwind decollator bottom.The shearing force that centrifugal force that produces in the whirlwind decollator and the collision between particle and the wall produce is disperseed pulverized coal particle, and what size that here can be by regulating exhausr port and pressure of compressed air size were regulated dispersancy and discharging opening goes out the sample speed and the angle of divergence.
What dust collect plant 24 adopted is the control of dust tube that has screen pack, and the aperture of screen pack is 0.5 μ m
(2) measuring system 3 is by light source (being generally laser instrument) 31, collimator and extender device 32, plus lens 34, testing window 33 (being the testing window in sample introduction and the dispersant system), photoelectric detector 35 (comprising centering detecting device and light scattering detector), data acquisition system (DAS) 4, as shown in Figure 3.
What laser instrument adopted is the 632.8nm helium-neon laser of 2.5mW; The collimator and extender device comprise magnification be 40 * microcobjective, aperture be that the spatial filtering pin hole of 15 μ m, cemented doublet and the bore that focal length is 60mm are the iris of 1～12mm.As shown in Figure 4, plus lens is made up of two different meniscus shaped lenses (preceding two) and a slice biconvex lens (the 3rd), and concave surface (preceding two) or positive curvature face (the 3rd) are towards testing window 33, wherein first (i.e. the 1st and the 2nd face) is negative focal length, the focal length size is-153.76mm that material is low-refraction (n
632.8=1.48598, n
632.8Refractive index when being the 632.8nm wavelength) QK3 glass, second (i.e. the 3rd and the 4th face) and the 3rd (i.e. the 5th and the 6th face) is positive focal length, and the focal length size is respectively 193.73mm and 231.47mm, and material is high index of refraction (n
632.8=1.79992, n
632.8Refractive index when being the 632.8nm wavelength) ZF7 glass.The clear aperture of each face is followed successively by 67.43mm, 88.27mm, 94.94mm, 101.6990mm, 137.10mm, 140.00mm.Each parameter of organizing lens satisfies f
1＜f
2＜f
3, R
1＜＜R
2, R
3＜R
4, R
5＞＞R
6, f in the formula
1, f
2, f
3Be respectively lens 1,2,3 focal length, R
1, R
2, R
3, R
4, R
5, R
6Be respectively the radius-of-curvature on surface 1～6.She Ji purpose is that the no vignetting of realizing big field angle scattered light is collected like this, in the image quality near diffraction limit that guarantees center field angle scattered light (5 ° field angle in), reduce the curvature of field as far as possible, improve the image quality of big field angle scattered light to greatest extent; By reasonably control distortion, reduce the size of photoelectric detector simultaneously, reduce its processing cost and difficulty.All surface all is coated with magnesium fluoride λ/4 anti-reflection films, and purpose is in order to reduce the scattered light that each surperficial reflected light and eyeglass itself are produced.
The laser that is sent by helium-neon laser can obtain the circular light spot that diameter is 6～8mm energy even by regulating iris behind the collimator and extender device.Light beam irradiates behind the collimation is in testing window 33, after the scattering of sample to be tested, collect scattered light by plus lens, here require testing window 33 along the distance of the 1st of the center position convergent lens of optical path direction less than 28mm, purpose is to collect big visual field scattered light in order to cooperate condenser lens not have vignetting.
Scattered light through plus lens all will converge on the focal plane of convergent lens.The scattered light projection image height on the focal plane and the theoretical relationship of scattered light angle are h=f*n*tan (θ/2), and wherein h is theoretical image height, and f is the focal length of condenser lens, n is the refractive index of dispersion medium, here dispersion medium is an air, and n gets 1, and θ is a scattering angle.Here it should be noted that owing to can produce distortion in the process of scattered light scioptics, therefore the relation of actual image height and theoretical image height can with following formula represent h '=-1.091e
-11* h
5+ 1.858e
-8* h
4-8.379e
-6* h
3+ 8.837e
-5* h
2+ 0.9989*h+5.189e
-3, wherein h ' is actual image height.
The main beam that laser instrument 31 sends is through testing window 33, and condenser lens incides in the central small hole 351 of light scattering detector, and by the centering detecting device reception of aperture 351 back, this signal is mainly used in light path centering.Scattered light signal is received by light scattering detector, this detector is made up of a series of silicon photocell arrays, its structure as shown in Figure 5, the center is the aperture 351 that a diameter is 45 μ m, four triangle detection devices 352 of the symmetry that distributing around aperture 351 are as the preliminary centering sign; 38 60 ° fan-shaped detector 353 in the left and right sides cross arrangement of aperture 351, arranges 6 pairs of 30 ° of fan-shaped detectors 354,12 contour fan-shaped detectors of the one-sided continuous arrangement of ragged edge continuously in its left-right symmetric then.The centering of detector is controlled by Single-chip Controlling high accuracy three-dimensional motorized precision translation stage, makes the accurately central small hole by detector for scattered light of main beam.Make the measurement range of native system reach 0.3～500 μ m by heavy caliber condenser lens and hyperchannel Design of photodetector, fully satisfy the particle size range that fineness of pulverized coal is measured.
Laser instrument can substitute with semiconductor laser or fiber laser, and every kind of laser instrument all has pros and cons separately, can select according to actual conditions.
The collimator and extender device can select for use various combination of lenses to realize, as long as satisfy formula requirement and practical structure requirement.
The basic purpose of condenser lens is the same, at different products different designing requirements is arranged, and multiple different design proposal also may occur at the requirement of identical product, and is substituting very strong.
The structure of detector designs according to condenser lens, and this detector is only effective at the condenser lens among the design.
(3) data analysis disposal system
Each photodetector outputs in the computing machine by signals collecting 41 and the treatment circuit that is attached thereto, and corresponding analysis software is housed in computing machine.This analysis software comprises on function and all parameters of DL/T567.5-95 and two standard-requireds of GB/T 19077.1-2008 is carried out analytical calculation, the more detailed measurement result that provides fineness of pulverized coal.
It below only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (10)
1. fineness measurement device for pulverized coal, it is characterized in that: include vibration injector, whirlwind diverting device and laser detector, described whirlwind diverting device is connected in sequence by vacuum generator, whirlwind decollator and the fairing of subduing vortical flow, the outlet of described vibration injector is communicated with vacuum generator, and described fairing is communicated with testing window in the laser detector.
2. fineness measurement device for pulverized coal according to claim 1 is characterized in that: described whirlwind diverting device also includes dust collect plant, and described dust collect plant is connected the below of testing window.
3. fineness measurement device for pulverized coal according to claim 1, it is characterized in that: this fineness measurement device for pulverized coal also includes the data analysis treating apparatus, described data analysis treating apparatus includes the signal acquisition circuit that is connected with photoelectric detector array signal on the laser detector, and the single chip computer device that is electrically connected with described signal acquisition circuit.
4. fineness measurement device for pulverized coal according to claim 1 is characterized in that: described fairing is formed by column pipe and the connection of column square tube, and described column pipe is communicated with the whirlwind decollator, and described column square tube is communicated with testing window.
5. fineness measurement device for pulverized coal according to claim 4 is characterized in that: the diameter of described column pipe is 4mm, and length is 50mm; Described column square tube is 30mm * 4mm, and length is 50mm.
6. fineness measurement device for pulverized coal according to claim 1, it is characterized in that: the Fourier transform lens in the described laser detector is arranged in order by the lens of two different falcates and a slice biconvex lens to be formed, a curved surface of all curved surfaces of described two meniscus shaped lenses and biconvex lens is the negative curvature face, and the positive curvature face of the concave surface of described two meniscus shaped lenses and biconvex lens is towards testing window.
7. fineness measurement device for pulverized coal according to claim 6 is characterized in that: the meniscus shaped lens of described centre and the focal length of biconvex lens are respectively 193.73mm and 231.47mm, and the focal length of another meniscus shaped lens is-153.76mm.
8. fineness measurement device for pulverized coal according to claim 6 is characterized in that: the meniscus shaped lens of described centre and biconvex lens all adopt refractive index n
632.8=1.79992 ZF7 glass is made; Described another meniscus shaped lens adopts refractive index n
632.8=1.48598 QK3 glass is made.
9. fineness measurement device for pulverized coal according to claim 6 is characterized in that: the radius-of-curvature of the lens of described two falcates and the curved surface of biconvex lens is followed successively by R
1, R
2, R
3, R
4, R
5, R
6, R wherein
1＜＜R
2, R
3＜R
4, R
5＞＞R
6
10. fineness measurement device for pulverized coal according to claim 1, it is characterized in that: the photodetector in the described laser detector is made up of a series of silicon photocell arrays, the center is an aperture that diameter is 45 μ m, four triangle detection devices of the symmetry that distributing around aperture; 38 60 ° fan-shaped detector in the cross arrangement of the aperture left and right sides, arranges 6 pairs of 30 ° of fan-shaped detectors, 12 contour fan-shaped detectors of the one-sided continuous arrangement of ragged edge continuously in its left-right symmetric then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201626943U CN201477022U (en) | 2009-07-21 | 2009-07-21 | Pulverized-coal fineness measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201626943U CN201477022U (en) | 2009-07-21 | 2009-07-21 | Pulverized-coal fineness measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN201477022U true CN201477022U (en) | 2010-05-19 |
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ID=42413273
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201626943U Expired - Fee Related CN201477022U (en) | 2009-07-21 | 2009-07-21 | Pulverized-coal fineness measuring device |
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|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230906A (en) * | 2011-04-07 | 2011-11-02 | 广东电网公司电力科学研究院 | System and method for testing natural characteristic of coal powder |
| CN105547762A (en) * | 2015-12-17 | 2016-05-04 | 广州敏远能源科技有限公司 | Boiler pulverized-coal sampling fineness on-line measurement method and apparatus |
-
2009
- 2009-07-21 CN CN2009201626943U patent/CN201477022U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230906A (en) * | 2011-04-07 | 2011-11-02 | 广东电网公司电力科学研究院 | System and method for testing natural characteristic of coal powder |
| CN105547762A (en) * | 2015-12-17 | 2016-05-04 | 广州敏远能源科技有限公司 | Boiler pulverized-coal sampling fineness on-line measurement method and apparatus |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20150721 |
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