CN106323825A - Pipeline powdered coal particle size measuring device and measuring method - Google Patents
Pipeline powdered coal particle size measuring device and measuring method Download PDFInfo
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- CN106323825A CN106323825A CN201610944064.6A CN201610944064A CN106323825A CN 106323825 A CN106323825 A CN 106323825A CN 201610944064 A CN201610944064 A CN 201610944064A CN 106323825 A CN106323825 A CN 106323825A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000003245 coal Substances 0.000 title claims abstract description 34
- 239000002245 particle Substances 0.000 title claims abstract description 28
- 238000005070 sampling Methods 0.000 claims abstract description 54
- 239000012895 dilution Substances 0.000 claims abstract description 34
- 238000010790 dilution Methods 0.000 claims abstract description 34
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 16
- 230000005465 channeling Effects 0.000 claims description 11
- 230000003189 isokinetic effect Effects 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000012898 sample dilution Substances 0.000 claims description 2
- 238000007865 diluting Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract 1
- 239000002817 coal dust Substances 0.000 description 9
- 239000008187 granular material Substances 0.000 description 2
- 208000031481 Pathologic Constriction Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 238000001093 holography Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 210000001215 vagina Anatomy 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
- 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
-
- 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
- G01N2015/0233—Investigating particle size or size distribution by optical means using imaging; using holography using holography
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- 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)
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to a digital holographic technique, and aims to provide a pipeline powdered coal particle size measuring device and a measuring method. The method comprises the following steps: sampling a gas in a powdered coal conveying pipeline by a sampling nozzle, mixing clean air with the sampled gas to form a mixed gas, and taking the mixed gas as a sample to be delivered into a diluting chamber; combining a laser with a spatial filter to generate collimated laser, and projecting the collimated laser to a CCD camera by virtue of a laser channel of the diluting chamber; and processing a holographic image acquired by the CCD camera to obtain concentration and particle size distribution information of the measured sample, and then obtaining concentration and particle size distribution data of the powdered coal in the sampled gas according to a dilution ratio of the measured sample. By use of the device and the method provided by the invention, online quantitative measurement on the particle size and the concentration of the powdered coal in a pipeline can be achieved at the same time. The device is easy to operate and has a relatively high automation degree, and the measurement process does not need artificial interference; and by virtue of computer calculation, a measurement result close to reality can be given, manpower and material resources are saved, and daily running monitoring and maintenance work of coal-fired boiler equipment are facilitated.
Description
Technical field
The present invention relates to a kind of Digital Holography, particularly relate to a kind of based on laser lighting and CCD camera image
The on-line measurement device of the external pipeline powder coal grain diameter of record and measuring method.
Background technology
The coal in thermal power plant typically requires use coal pulverizer and is pulverized by raw coal, makes coal dust.Because through powder
Coal burning characteristic after broken is good, and Pulverized Coal Particle Cloud is the thinnest easily to catch fire, burn completely, can reduce unburnt loss.This
Outward, granule is thinner, more responds readily to air current flow, and stove fuel is evenly distributed, and in flameholding, beneficially regulating stove, burning is not
Steady little with flame distribution inequality heat loss.But that is pulverized by pulverized coal particle is the least, the power consumption in its crushing process increases, coal-grinding
In machine, coal-grinding component wear increases (particularly ball mill), increases maintenance.Meanwhile, the easy dust from flying of microfine coal, cause
Coal dust loss increase.
Realize the on-line measurement of primary air piping coal particle size, for maintaining high efficiency boiler safe operation significant.
The primary air piping coal particle size metering system that thermal power plant is conventional at present is mainly sampling and measuring method, needs coal dust from pipeline
Middle sampling, and sieved by the sieve of different pore size, obtain the mass fraction of different-grain diameter coal dust thus obtain coal particle size and divide
Cloth, described sampling and measuring method operating procedure is numerous and diverse and real-time is the highest, it is impossible to meet the demand that coal pulverizer regulates in real time；At present
Existing line Measurement Technique mainly has light Fluctuation Method, utilizes the pulsation of the optical signal that coal dust caused by measurement zone, according to Mie
Coal particle size is measured in scattering theory inverting, but described method can only measure the mean diameter of coal powder size, it is impossible to quantitative measurement
The particle diameter distribution of coal dust, it is impossible to meet the requirement that thermal power plant's economical and efficient runs.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes deficiency of the prior art, it is provided that a kind of pipeline powder coal particle diameter is surveyed
Amount device and measuring method.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
Thering is provided a kind of pipeline powder coal particles diameter measuring device, including sampling module, this device also includes air distribution module, swashs
Optical measuring module and negative pressure module；Wherein,
Sampling module includes sampling mouth, effusion meter and the valve being sequentially connected with by pipeline；
Air distribution module includes the Zero gas generator for generating pure air, and its export pipeline is divided into two-way: a road
Pipeline is connected in laser measurement module, is used for providing optical window to protect gas；Effusion meter and valve is set on another road pipeline, and with
The export pipeline of sampling module connects, and makes pure air and gas sampled be mixed to form mixed gas, and send as tested sample
Enter in laser measurement module；
Described laser measurement module includes laser instrument, spatial filter, dilution chamber and the CCD camera being sequentially arranged, laser
Device and spatial filter combination are used for producing collimation laser；The enclosure interior of dilution chamber is hollow cavity, its one end be provided with for
Introducing the primary air inlet of mixed gas, the other end of relative direction sets out QI KOU, and gas outlet is connected to negative pressure module by pipeline；?
On the relative housing of the both sides of dilution chamber, an optical window is respectively set as laser channeling, laser channeling and mixed gas
It is orthogonal for flowing through passage；
Described negative pressure module includes that one is connect by pipeline successively for the sampling pump generating negative pressure, the gas outlet of dilution chamber
In filter and the arrival end of sampling pump.
In the present invention, the effusion meter in described sampling module is pitot tube flowmeter；Described valve is manually-operated gate or electricity
Movable valve, can control the flow of gas in pipelines.
In the present invention, laser instrument, spatial filter, optical window, CCD camera and dilution chamber are equipped with the spiral shell of coupling
Stricture of vagina, realizes being connected with each other by screw thread between each parts.
In the present invention, the housing of described dilution chamber is the housing of plastics or metal material, and it is shaped as cuboid.
In the present invention, described dilution chamber sets gas blow pipe；One end of gas blow pipe is connected to the export pipeline of Zero gas generator, separately
One end is closed, and is being provided with multiple gas hole on the gas blow pipe of optical window position.
The method that invention further provides the pipeline powder coal grain diameter measurement utilizing aforementioned means, including:
The gas in power transportation pipe is gathered by sampling mouth, and by the flow of Valve controlling gas sampled；Make cleaning
Air and gas sampled are mixed to form mixed gas, and send in dilution chamber as tested sample；Sampling pump formed negative pressure, make by
This flowing in dilution chamber of test sample；Laser instrument and spatial filter combination produce collimation laser, by dilution chamber two optics
The laser channeling that window is formed is incident upon in CCD camera, and laser channeling is orthogonal with the passage that flows through of mixed gas；Right
The hologram image that CCD camera obtains processes, and obtains concentration and the particle diameter distributed intelligence of sample, further according to tested sample
Dilution ratio get coal powder density and particle size distribution data in gas sampled in return.
In the present invention, described sampling mouth can continuously and stably carry out isokinetic sampling；Described isokinetic sampling refers to, mouth of sampling
Can be operated according to predicted velocity method, pitot tube Parallel Sampling method or instantaneous pressure zero balance method.
In the present invention, described pure air and gas sampled are mixed to form mixed gas in the ratio of 5:1～20:1.
Inventive principle describes:
Sampling head in the present invention can carry out isokinetic sampling.Described Zero gas generator produces pure air, and major part is empty
Gas and sample gas are by predetermined ratio mixed diluting, and fraction, as protective gas, prevents described optical window from being polluted by coal dust.Swash
Light device can send stable monochromatic light, can be red, green or the light of other colors.Produce collimation with spatial filter to swash
Light, incides on the sample gas after dilution by described optical window, and CCD camera passes through the optical window of the other end to generation
Hologram image catches, and hologram imports computer and processes.Containing coal dust gas after described filtering material filters,
Discharged by described sampling pump.Described hologram contains the spatial information of granule, further by described hologram image
Process and obtain the concentration of described sample, particle diameter distributed intelligence.
Compared with prior art, the invention has the beneficial effects as follows:
1, the present invention relates to digital hologram device, the online fixed of pulverized coal particle particle diameter and concentration in pipeline can be realized simultaneously
Measurement.This device is simple to operate, and automaticity is higher, and process of measuring is without human intervention；
2, the method that the present invention uses digital hologram, computer calculates and can be given close to real-time measurement result, saves people
Power material resources, facilitate day-to-day operation monitoring and the maintenance work of boiler fired coal equipment.
Accompanying drawing explanation
Fig. 1 pipeline powder coal particles diameter measuring device pneumatic diagram；
Fig. 2 pipeline powder coal particles diameter measuring device dilution chamber structural representation；
1. sampling mouth, 2. effusion meter, 3. valve, 4. pitot tube, 5. Zero gas generator, 6. dilution chamber, 7. laser instrument in figure,
8. spatial filter, 9. optical window, 10.CCD, 11. filters, 12. sampling pumps, 13. primary air inlets, 14. gas blow pipes, 15.
Gas hole, 16. housings, 17. gas outlets.
Detailed description of the invention
The most further describe in detail:
Pipeline powder coal particles diameter measuring device in the present invention, including sampling module I, air distribution module II, laser measurement
Module III and negative pressure module IV.
Sampling module I includes sampling mouth 1, effusion meter 2 and the valve 3 being sequentially connected with by pipeline；Sampling mouth 1 can continuously, surely
Surely isokinetic sampling is carried out.Described isokinetic sampling refers to, sampling mouth 1 can according to predicted velocity method, pitot tube Parallel Sampling method or
Instantaneous pressure zero balance method is operated.Sampling mouth 1 in Fig. 1 is operated according to pitot tube Parallel Sampling method, because of
This effusion meter 2 is pitot tube flowmeter, is configured with pitot tube 4 separately.Valve 3 can use manually-operated gate or electrically operated valve, is used for
Control the flow of gas in pipelines.
Air distribution module II includes the Zero gas generator 5 for generating pure air, and its export pipeline is divided into two-way: one
Road pipeline is connected in laser measurement module III, for providing the protection gas used by optical window 9 (to prevent optical window 9 by coal dust
Pollute)；Set effusion meter and valve on another road pipeline, and connect with the export pipeline of sampling module, make pure air and sampling
Gas is mixed to form mixed gas, and sends in laser measurement module III as tested sample；Valve herein can be equally used for
Control the flow of gas in pipelines.
Laser measurement module III includes laser instrument 7, spatial filter 8, dilution chamber 6 and the CCD camera 10 being sequentially arranged, and swashs
Light device 7 and spatial filter 8 combination are used for producing collimation laser；The enclosure interior of dilution chamber 6 is hollow cavity, and its one end is provided with
For introducing the primary air inlet 13 of mixed gas, the other end of relative direction sets out QI KOU 17, and gas outlet 17 is connected to by pipeline
Negative pressure module IV；On the relative housing of the both sides of dilution chamber 6, an optical window 9 is respectively set and leads to as laser channeling, laser
Road is orthogonal with the passage that flows through of mixed gas；The screw thread of coupling it is equipped with on each parts of laser measurement module III,
Realize being connected with each other (or being connected by converting interface) by screw thread.
The optional plastics of housing of dilution chamber 6 or metal material, it is shaped as cuboid, is considered as sealing problem.Dilution
Chamber 6 sets gas blow pipe 14；One end of gas blow pipe 14 is connected to the export pipeline of Zero gas generator 5, and the other end is closed, near optics
The gas blow pipe 14 of window 9 position is provided with multiple gas hole 15.
Negative pressure module IV includes that one is depended on by pipeline for the sampling pump 12 generating negative pressure, the gas outlet 17 of dilution chamber 6
The secondary arrival end being connected to filter 11 and sampling pump 12.
The method utilizing the pipeline powder coal grain diameter measurement of aforementioned means, including:
Gathered the gas in power transportation pipe by sampling mouth 1, and controlled the flow of gas sampled by valve 3；Make clean
Net air is mixed to form mixed gas with gas sampled in the ratio of 5:1～20:1, and sends in dilution chamber as tested sample；
Sampling pump 12 forms negative pressure, makes tested sample flow in dilution chamber 6；Laser instrument 7 and spatial filter 8 combination produce collimation and swash
Light, is incident upon in CCD camera 10 by the laser channeling of two optical window 9 formation in dilution chamber 6, laser channeling and gaseous mixture
The passage that flows through of body is orthogonal；The hologram image obtained CCD camera 10 by computer processes, and obtains detected sample
The concentration of product and particle diameter distributed intelligence, the dilution ratio further according to tested sample gets coal powder density and particle diameter in gas sampled in return
Distributed data.Hologram calculating content be the prior art of comparative maturity, specifically can participate in Goodman works " Fourier
Leaf optics introduction " introduction, the present invention repeats no more.
Claims (8)
1. a pipeline powder coal particles diameter measuring device, including sampling module, it is characterised in that: this device also includes air distribution mould
Block, laser measurement module and negative pressure module；Wherein,
Sampling module includes sampling mouth, effusion meter and the valve being sequentially connected with by pipeline；
Air distribution module includes the Zero gas generator for generating pure air, and its export pipeline is divided into two-way: a road pipeline
It is connected in laser measurement module, is used for providing optical window to protect gas；Set effusion meter and valve on another road pipeline, and with sampling
The export pipeline of module connects, and makes pure air and gas sampled be mixed to form mixed gas, and sends into as tested sample sharp
In optical measuring module；
Described laser measurement module includes laser instrument, spatial filter, dilution chamber and the CCD camera being sequentially arranged, laser instrument and
Spatial filter combination is used for producing collimation laser；The enclosure interior of dilution chamber is hollow cavity, and its one end is provided with for introducing
The primary air inlet of mixed gas, the other end of relative direction sets out QI KOU, and gas outlet is connected to negative pressure module by pipeline；In dilution
On the relative housing of the both sides in chamber, an optical window is respectively set and flows through with mixed gas as laser channeling, laser channeling
Passage is orthogonal；
Described negative pressure module includes that one was connected to by pipeline successively for the sampling pump generating negative pressure, the gas outlet of dilution chamber
Filter and the arrival end of sampling pump.
Device the most according to claim 1, it is characterised in that the effusion meter in described sampling module is Pitot Tube Flow
Meter；Described valve is manually-operated gate or electrically operated valve, can control the flow of gas in pipelines.
Device the most according to claim 1, it is characterised in that in laser instrument, spatial filter, optical window, CCD camera
Be equipped with the screw thread of coupling in dilution chamber, realize being connected with each other by screw thread between each parts.
Device the most according to claim 1, it is characterised in that the housing of described dilution chamber is the shell of plastics or metal material
Body, it is shaped as cuboid.
Device the most according to claim 1, it is characterised in that set gas blow pipe in described dilution chamber；One termination of gas blow pipe
To the export pipeline of Zero gas generator, the other end is closed, and is being provided with multiple gas hole on the gas blow pipe of optical window position.
6. the method utilizing the pipeline powder coal grain diameter measurement of device described in claim 1, it is characterised in that including:
The gas in power transportation pipe is gathered by sampling mouth, and by the flow of Valve controlling gas sampled；Make pure air
It is mixed to form mixed gas with gas sampled, and sends in dilution chamber as tested sample；Sampling pump forms negative pressure, makes detected sample
This flows in dilution chamber；Laser instrument and spatial filter combination produce collimation laser, by dilution chamber two optical windows
The laser channeling formed is incident upon in CCD camera, and laser channeling is orthogonal with the passage that flows through of mixed gas；To CCD
The hologram image that camera obtains processes, and obtains concentration and the particle diameter distributed intelligence of sample, further according to tested sample
Dilution ratio gets coal powder density and particle size distribution data in gas sampled in return.
Method the most according to claim 6, it is characterised in that described sampling mouth can continuously and stably carry out isokinetic sampling；
Described isokinetic sampling refers to, sampling mouth can be according to predicted velocity method, pitot tube Parallel Sampling method or instantaneous pressure zero balance method
It is operated.
Method the most according to claim 6, it is characterised in that described pure air and gas sampled press 5:1's～20:1
Ratio is mixed to form mixed gas.
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| CN201610944064.6A CN106323825B (en) | 2016-10-26 | 2016-10-26 | Device and method for measuring particle size of pipeline pulverized coal |
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| CN201610944064.6A CN106323825B (en) | 2016-10-26 | 2016-10-26 | Device and method for measuring particle size of pipeline pulverized coal |
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