CN109507074A - A kind of minimum discharge dust concentration monitoring device and monitoring method - Google Patents
A kind of minimum discharge dust concentration monitoring device and monitoring method Download PDFInfo
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- CN109507074A CN109507074A CN201910052888.6A CN201910052888A CN109507074A CN 109507074 A CN109507074 A CN 109507074A CN 201910052888 A CN201910052888 A CN 201910052888A CN 109507074 A CN109507074 A CN 109507074A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000000428 dust Substances 0.000 title claims abstract description 26
- 238000012806 monitoring device Methods 0.000 title claims abstract description 14
- 238000012544 monitoring process Methods 0.000 title claims abstract description 13
- 238000005259 measurement Methods 0.000 claims abstract description 70
- 230000005250 beta ray Effects 0.000 claims abstract description 64
- 239000013618 particulate matter Substances 0.000 claims abstract description 40
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000000443 aerosol Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 25
- 238000000790 scattering method Methods 0.000 claims description 16
- 238000012937 correction Methods 0.000 claims description 12
- 239000008187 granular material Substances 0.000 abstract description 3
- 239000004071 soot Substances 0.000 abstract description 2
- 239000003500 flue dust Substances 0.000 description 9
- 238000000149 argon plasma sintering Methods 0.000 description 7
- 239000000779 smoke Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 241000931526 Acer campestre Species 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical group [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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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
- G01N15/06—Investigating concentration of particle suspensions
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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
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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- Life Sciences & Earth Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
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Abstract
The present invention relates to soot dust granule objects to monitor field, especially a kind of minimum discharge dust concentration monitoring device and monitoring method.This concentration monitoring device includes angle scatterometry device, beta-ray measurement device and computer, and angle scatterometry device includes He-Ne laser, laser controller, temperature control power supply, aerosol generator, heating device, particulate matter measurement zone, photodetector and photoelectric converter；Beta-ray measurement device includes β ray irradiation source, sampling pipe, β-ray detector and vacuum pump, sampling pipe is connected with particulate matter measurement zone, vacuum pump is connected with sampling pipe, photoelectric converter, β-ray detector are connected with computer, measurement result is transmitted to computer, computer is using the angle scatterometry of beta-ray measurement calibration of the output results as a result, obtaining the real-time concentration information of corrected particulate matter.More accurate, real-time measurement result can be obtained in this monitoring method, can meet the real-time and accuracy requirement of emission measurement simultaneously.
Description
Technical field
The present invention relates to soot dust granule objects to monitor field, especially a kind of minimum discharge dust concentration monitoring device and monitoring
Method.
Background technique
The granule density of flue dust is one of the important parameter for characterizing smoke contamination object emission behaviour.Weight method is the world at present
The universal test method of upper particulate pollutant.Demand based on on-line measurement, and form continuous weighting method, ray method etc. in real time
Sample the online concentration analysis method such as dust concentration analytic approach and charge method, light scattering method.But with the requirement of environmental protection
Being greatly reduced for raising and the progress of dedusting technology, minimum discharge dust concentration and granularity, measures according to sampling method,
Measurement error is smaller, but single sample time is longer, measures according in line method, can obtain real time data, but survey
It is larger to measure error.
In order to solve the problems, such as minimum discharge monitoring smoke dust, angular scattering method and the measurement of β ray method are generallyd use.Angular scattering method is
One laser and a photodetector are installed at an angle in measured zone, laser issues laser irradiation measurement zone,
Photodetector acceptance angle scattered signal, converts optical signals into electric signal by photoelectric converter, using being calculated
Grain object concentration information.But due to particle size distribution unevenness in flue dust, common single angle angular scattering method can not learn cigarette
Particle diameter distribution in dirt causes measurement error larger.β ray method is to acquire one with probe tube at interval of a period of time in measurement zone
A little particulate matters calculate the concentration of flue dust according to Beta-ray attenuation degree, and β ray method measurement result is more accurate, but real-time
It is poor.
For minimum discharge flue dust, measurement accuracy and requirement of real-time are needed while being satisfied, and therefore, conventional angular dissipates
It penetrates method and beta-ray measurement minimum discharge flue dust is unable to reach requirement, provide the real-time granularity of accurate particulate matter and concentration information.
Summary of the invention
It against the above deficiency, can be simultaneous the present invention provides a kind of minimum discharge dust concentration monitoring device and monitoring method
The real-time and accuracy requirement for caring for emission measurement, can be used for the monitoring of minimum discharge dust concentration.
The technical solution of the present invention is as follows:
A kind of minimum discharge dust concentration monitoring device, including angle scatterometry device, beta-ray measurement device and calculating
Machine, the angle scatterometry device include He-Ne laser, laser controller, temperature control power supply, aerosol generator, heating dress
It sets, particulate matter measurement zone, photodetector and photoelectric converter, the concentration information for real-time measurement particulate matter；The β ray
Measuring device includes β ray irradiation source, sampling pipe, β-ray detector and vacuum pump, measures particulate matter for separated in time
Concentration information, the sampling pipe is connected with particulate matter measurement zone, and the vacuum pump is connected with sampling pipe, the photoelectric converter
It is connected with β-ray detector with computer, measurement result is transmitted to computer, the computer utilizes beta-ray measurement result
Correction angle scatterometry is as a result, obtain the real-time concentration information of corrected particulate matter.
A kind of minimum discharge dust concentration monitoring method, comprising the following steps:
S1: particulate matter is measured using minimum discharge dust concentration monitoring device described in claim 1；
S2: by calculating, the real-time concentration of particulate matter is obtained by angular scattering method, separated in time is obtained by β ray method
Particle concentration；
S3: the particle concentration that the particle concentration correction angular scattering method measured with β ray measures obtains corrected
Particulate matter real-time concentration information.
The concentration correction formula of the step S3 are as follows:
Wherein, i indicates that time, β ray method per half an hour return to one-shot measurement as a result, C0,iIt indicates to dissipate at the moment angle i
Penetrate method measurement concentration, C1,iIt indicates to measure concentration, C in i moment β ray method2,iIndicate the angle at the i moment after β ray correction
Scatter concentration, C1,[i/30]*30Indicate distance i moment recent beta-ray measurement concentration, C0,[i/30]*30It indicates in [i/30] *
30 moment, corresponding angular scattering method measured concentration.
The present invention by angle scatterometry device couple beta-ray measurement device, angular scattering method obtain in real time, have certain mistake
The particle concentration of difference, β ray method obtains particle concentration accurate, that real-time is poor, with the correction of β ray method measurement result
More accurate, real-time measurement result can be obtained in angular scattering method measurement result, can meet simultaneously emission measurement real-time and
Accuracy requirement.Meanwhile the present apparatus simultaneously have the characteristics that it is online, contactless, easy to maintain.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of minimum discharge dust concentration monitoring device of the present invention；
Fig. 2 is minimum discharge dust concentration monitoring method block diagram of the present invention.
Specific embodiment
It is described further below with reference to technical effect of the attached drawing to design of the invention, specific structure and generation, with
It is fully understood from the purpose of the present invention, feature and effect.
With reference to Fig. 1, minimum discharge dust concentration monitoring device of the invention, including angle scatterometry device 10, β ray are surveyed
Measure device 20 and computer 30.
Angle scatterometry device 10 is used for the concentration information of real-time measurement particulate matter, including 11,3 laser of He-Ne laser
16,3 controller 12, temperature control power supply 13, aerosol generator 14, heating device 15, particulate matter measurement zone photodetectors 17
With photoelectric converter 18.Wherein, He-Ne laser 11 is for generating laser, and multiple laser controllers 12 are for adjusting different demands
Wavelength, temperature control power supply 13 is used to stablize the temperature of He-Ne laser 11, maintains the stability of 11 output power of He-Ne laser.
Aerosol generator 14 is used for heated particle object for uniformly exporting particulate matter, heating device 15, avoids poly- between particulate matter
Collection.By particulate matter measurement zone 16 after overbunching, the particulate matter by heating is also arrived under air pump effect by pipeline laser
Up to particulate matter measurement zone 16, laser passes through the measurement zone with particulate matter, generates angle scattered signal.Multiple photodetectors 17 with
Laser controller 12 is corresponding, and for receiving the angle scattered signal of different wave length, photoelectric converter 18 is used for the light that will be received
Signal is converted into electric signal.
Concentration information of the beta-ray measurement device 20 for separated in time measurement particulate matter, including β ray irradiation source
21, sampling pipe 22, β-ray detector 23 and vacuum pump 24.Wherein, β ray irradiation source 21 is for issuing β ray, sampling pipe 22
It is connected with particulate matter measurement zone 16, acquires particulate matter from particulate matter measurement zone 16 for separated in time, vacuum pump 24 is used for
Adjust the flow velocity of Particle flow.β ray generates decaying by particulate matter, and the signal after decaying is received by β-ray detector 23.
Photoelectric converter 18 and β-ray detector 23 are connected with computer 30, and measurement result is sent to computer 30, is used for
Further analysis and processing.Computer 30 respectively obtains the real-time particle concentration letter that angular scattering method measurement obtains by calculating
The particle concentration information for the separated in time that breath and β ray method measurement obtain, computer 30 utilize beta-ray measurement knot
The scatterometry of fruit correction angle is as a result, obtain the real-time concentration information of corrected particulate matter.
With reference to Fig. 2, minimum discharge dust concentration monitoring method of the invention, comprising the following steps:
S1: particulate matter is measured with minimum discharge dust concentration monitoring device of the invention；
S2: by calculating, the real-time concentration of particulate matter is obtained by angular scattering method, separated in time is obtained by β ray method
Particle concentration；
Angular scattering method be based on Mie-scattering lidar, since particulate matter measurement zone 16 is small space, according to Mie-scattering lidar,
The scattered light intensity of the individual particle under light condition of incidence can be calculated are as follows:
Wherein, λ is optical maser wavelength, and r is particle to sensing point distance, and scatteringangleθ is the received scattering light of photodetector
With incident light angulation, it is the function of flue dust partial size D and scatteringangleθ, I that i (θ), which is scattering light amplitude function,0For incident light
Intensity.
It is hereby achieved that particulate matter volumetric concentration:
Wherein, VDiFor n partial size DiThe total volume of particle, V are measurement total volume, and V=S × v, S are facula area, and v is
Flue gas flow rate.
β ray method be based on β radiation absorption principle, β ray due to particulate matter scattering process and decay, receive by
The β radiation exposure that the source β is issued, measures decaying light intensity, is calculated analytically and then obtains dust concentration.β ray passes through particle
Decaying expression formula after object:
Wherein, I0For β ray incident intensity, I is β ray through into the intensity in transmission after the dust deposition layer with a thickness of t, μm
=μ/ρ is mass attentuation coefficient, and wherein μ is the β linear absorption coefficient of flue dust, and ρ is smoke-density, tmFor mass thickness.
It is hereby achieved that the mass concentration of particulate matter:
Wherein, S is the area for accumulating flue dust filter membrane, and ρ is smoke-density, and V is measurement total volume.
S3: the particle concentration that the particle concentration correction angular scattering method measured with β ray measures obtains corrected
, high-precision particulate matter real-time concentration information.Since β ray method can only obtain or so half an hour a data, but it is accurate
Property it is preferable, and light scattering method can obtain data in real time, but accuracy is general, go amendment primary with β ray method per half an hour
The concentration data of light scattering.
Concentration correction formula are as follows:
Wherein, i indicates time, C0Indicate light scattering measurement concentration, C1Indicate beta-ray measurement concentration, C2It indicates by β ray
Light scattering measurement concentration after correction, C2,iIndicate the measurement concentration at the i moment after β ray correction, C0,iIt indicates at the i moment
Light scattering measurement concentration, C1,[i/30]*30Indicate distance i moment recent beta-ray measurement concentration, C0,[i/30]*30It indicates
[i/30] * 30 moment corresponding light scattering measurement concentration.
Particle concentration if table 1 such as shows, in minimum discharge dust concentration monitoring device of the invention measure 65 minutes
Variation, the every 5 minutes return one-shot measurement result C of angle scatterometry device 100, return to one within beta-ray measurement device 20 every 30 minutes
Secondary measurement result C1, with the angle scatterometry of beta-ray measurement calibration of the output results as a result, obtain it is corrected after particle concentration value C2。
It can be seen that C2Compare C0It is more accurate by revised measurement result closer to the actual result of particle concentration, and in real time
Property it is good, can in real time, accurately reflect particle concentration change, more accurate effective concentration monitor is provided, be flue dust
Minimum discharge measures optimal control and provides reference.
Table 1:
Disclosed above is only the embodiment of the present invention, and still, the present invention is not limited to this, the technology of any this field
What personnel can think variation should all fall into protection scope of the present invention.
Claims (3)
1. a kind of minimum discharge dust concentration monitoring device, which is characterized in that surveyed including angle scatterometry device (10), β ray
Device (20) and computer (30) are measured, the angle scatterometry device includes He-Ne laser (11), laser controller (12), temperature
Control power supply (13), aerosol generator (14), heating device (15), particulate matter measurement zone (16), photodetector (17) and light
Electric transducer (18), the concentration information for real-time measurement particulate matter；The beta-ray measurement device includes β ray irradiation source
(21), sampling pipe (22), β-ray detector (23) and vacuum pump (24), the concentration for separated in time measurement particulate matter
Information, the sampling pipe (22) are connected with particulate matter measurement zone (16), and the vacuum pump (24) is connected with sampling pipe (22), described
Photoelectric converter (18), β-ray detector (23) are connected with computer (30), and measurement result is transmitted to computer (30), institute
Computer (30) is stated using the angle scatterometry of beta-ray measurement calibration of the output results as a result, obtaining the real-time dense of corrected particulate matter
Spend information.
2. a kind of minimum discharge dust concentration monitoring method, which comprises the following steps:
S1: particulate matter is measured using minimum discharge dust concentration monitoring device described in claim 1；
S2: by calculating, the real-time concentration of particulate matter is obtained by angular scattering method, of separated in time is obtained by β ray method
Grain object concentration；
S3: the particle concentration that the particle concentration correction angular scattering method measured with β ray measures obtains corrected particle
Object real-time concentration information.
3. minimum discharge dust concentration monitoring method according to claim 2, which is characterized in that the concentration of the step S3
Updating formula are as follows:
Wherein, i indicates that time, β ray method per half an hour return to one-shot measurement as a result, C0,iIt indicates in i moment angular scattering method
Measure concentration, C1,iIt indicates to measure concentration, C in i moment β ray method2,iIndicate that the angle at the i moment after β ray correction scatters
Concentration, C1,[i/30]*30Indicate distance i moment recent beta-ray measurement concentration, C0,[i/30]*30It indicates in [i/30] * 30
Carve corresponding angular scattering method measurement concentration.
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Cited By (5)
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| CN112362546A (en) * | 2020-11-09 | 2021-02-12 | 中国南方电网有限责任公司超高压输电公司柳州局 | High-precision multiband portable particulate matter mass concentration measuring instrument |
| CN112630127A (en) * | 2021-03-10 | 2021-04-09 | 中国科学院上海高等研究院 | Vacuum particle counter |
| CN112649337A (en) * | 2020-12-21 | 2021-04-13 | 张家口市杰星电子科技有限公司 | Oil smoke online monitoring method and device |
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Application publication date: 20190322 |