CN202869934U - Novel real-time monitoring device for mass concentration of PM2.5 - Google Patents
Novel real-time monitoring device for mass concentration of PM2.5 Download PDFInfo
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- CN202869934U CN202869934U CN201220522529.6U CN201220522529U CN202869934U CN 202869934 U CN202869934 U CN 202869934U CN 201220522529 U CN201220522529 U CN 201220522529U CN 202869934 U CN202869934 U CN 202869934U
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Abstract
The utility model relates to a novel real-time monitoring device for the mass concentration of PM2.5. The novel real-time monitoring device comprises a PM2.5 sampling mechanism, a photoelectric measuring mechanism and peripheral accessories. The novel real-time monitoring device is characterized by also comprising a particle condensing mechanism; the photoelectric measuring mechanism comprises an air path, a light path, a signal processing part and an auxiliary part; an air outlet of the PM2.5 sampling mechanism is connected with an air inlet of the particle condensing mechanism; and an air outlet of the particle condensing mechanism is connected with an air inlet of the photoelectric measuring mechanism. The novel real-time monitoring device provided by the utility model has the advantages that the PM2.5 is condensed, so that the number of particles in sample gas is greatly reduced, the data processing capacity of the device is reduced and the measuring speed is accelerated; and in the photoelectric measurement link, peak signals of the large particles and peak signals of the small particles are separated, and the signals are ordered for averaging, and the accuracy of the device is improved, so that the real-time monitoring is carried out on the mass concentration of the PM2.5 with high efficiency.
Description
Technical field
The utility model relates to environmental monitoring and protection field, is specifically related to a kind of novel PM2.5 mass concentration real-time monitoring device.
Background technology
PM2.5 refers to that the aerodynamics equivalent diameter less than or equal to the Atmospheric particulates of 2.5 μ m, is commonly called fine particle or fine particle, also is called as in China to enter the lung particle.The principal ingredient of PM2.5 is elemental carbon, Organic Compounds, sulfate, nitrate, ammonium salt.In addition, common composition comprises various metallic elements, and the element of rich content in the earth's crust such as existing sodium, magnesium, calcium, aluminium, iron also has lead, zinc, cadmium, copper etc. mainly to be derived from the human heavy metal element that pollutes.PM2.5 is mainly derived from the processes such as burning, airborne dust, such as the burning of the burning of the discharging of the burning of coal, motor-vehicle tail-gas, life cooking stove, rubbish, dust on the roads, building airborne dust etc.Simultaneously, human activity enters the gaseous contaminants such as sulphuric dioxide in the atmosphere, oxides of nitrogen, ammonia, volatile organic matter also can form the less second particle thing of particle diameter through chemical reaction or physical process, comprises sulfate, nitrate, ammonium salt and photo-chemical smog etc.In addition, the natural pollution sources such as volcanic debris, forest fire, sea salt, pollen, fungal spore, bacterium also are the sources of PM2.5.PM2.5 is because particle diameter is little, and the characteristic that adsorbability is strong is carried easily some poisonous and harmful substances and entered the human lung, brings great harm to health.Simultaneously, PM2.5 also can become the carrier of virus and bacterium, for the propagation of respiratory infectious disease is added fuel to the flames.Aspect environment, PM2.5 can cause atmospheric visibility to reduce, thereby has influence on people's production and life.The sulfuric acid and the nitric acid drop that are transformed by sulphuric dioxide and oxides of nitrogen etc. are one of sources of PM2.5, it also is the main cause that forms acid rain, can damage aquatic ecosystem, terrestrial ecosystems, be detrimental to health by food chain, can produce corrosive attack to buildings, machinery and urban operating mechanism simultaneously.PM2.5 in the atmosphere also can disturb the radiation on the sun and ground, thereby provincialism even global climate are exerted an influence.
In air quality standard is listed PM2.5 already by more external developed countries, and along with the issue of American Embassy in China to the Air Quality of Beijing Monitoring Data, PM2.5 becomes the hot word of news immediately, and " ambient air quality " of the new revision of State Council also increased the monitoring index to PM2.5.But at present domestic corresponding monitoring instrument is also immature, and there are relatively large deviation in the data and the foreign standard that record.
The method of main measurement particle concentration has weight method, β attenuation sensors, micro-oscillating balance method, piezoelectric crystal method and light scattering method etc. both at home and abroad at present, adds that at sampling gas circuit front end the cutter of PM2.5 can record the concentration of PM2.5.
Weight method is the most basic method of measuring concentration of granules in certain, generally is combined with other measuring method, because its principle is simple, reliable results is commonly used to detect the degree of accuracy of other measuring method and instrument, so is widely applied.The ultimate principle of the method is the traffic sampling of stipulating, with airborne particle collection on the high-performance filter membrane, quality before and after the weighing filter membrane sampling, by its particle quality of trying to achieve capture of poor quality, according to weight difference and the sampled air volume of filter membrane before and after the sampling, calculate the mass concentration of particle again.Guaranteeing that instrument is good and operating under the correct condition that weight method can obtain relatively reliably result.But it needs a large amount of manual operationss, and the sampling time is long, and automaticity is low, and cost is higher and be difficult to realize on-line monitoring.
The β attenuation sensors is a kind of method that grows up on the weight method basis, uses also very extensive in particle sizing.Its measurement module is comprised of beta ray source, filter membrane, filter membrane support and detector etc.When air passes through filter membrane, particle is filtered on filter membrane, after after a while, rotation axis drive filter membrane moves and makes particle enter measurement zone, the β ray that send on measured zone top is through decay behind the granule medium and received, can determine the quality of tested particle according to Beta-ray attenuation degree, and then try to achieve the mass concentration of particle.The advantage of the method is the wide dynamic range measured, and measurement result and aerocolloidal kind, particle diameter, shape, color and chemical composition etc. are irrelevant, only relevant with the quality of particle.But owing to there is radioactive radiation source, produce easily radiation leakage, so there is potential safety hazard in the method, it is higher to operating personnel's competency profiling to be used for in-site measurement, and simultaneously, system requirements increases various shielding measures, and constructional device is complicated and expensive.Therefore, the β attenuation sensors generally is applicable to measurement is had the occasion of specific (special) requirements.
Trace oscillating balance method (TEOM), it is the particle quality concentration measuring method that in recent years just grows up, measuring principle is based on conical component vibration microbalance principle, the core component of instrument is the conical component oscillator, whole parts are hollow, wherein an end is fixed, the filter membrane support that the other end is equipped with can freely swing, parts accurately vibrate with its intrinsic frequency, positive feedback control circuit makeup energy guarantees not have energy loss, and automatic gain control circuit is so that vibration keeps constant amplitude.The oscillator oscillation frequency is determined by the filter membrane of participating in vibration and the particle quality on the filter membrane, instrument is by sampling pump and flowmeter, make surrounding air pass through sampling membrane with constant flow, measure two oscillation frequency of certain intervals time front and back, the variation of particle quality on the filter membrane in drawing during this period of time, divided by the cumulative volume of the air that flows through filter membrane, just obtain the during this period of time mean concentration of interior particulate in air again.The trace oscillating balance can be used in the concentration of real-time continuous monitoring particulate in air, and its measuring accuracy and real-time are that classic method is incomparable, but that this instrument is disturbed by temperature, humidity is larger, and requires very high to filter membrane.
The piezoelectric crystal method is called again the piezoelectric crystal frequency-difference method, adopts quartz resonator as the sensitive element of measuring particle.Its principle of work is to make air pass through cutter with constant rate, enter the Electrostatic collection device that is formed by effluve pin and micro-quartz resonator, under the effect of high-voltage corona discharge, particle in the air-flow all falls on the electrode surface of measuring resonator, because having increased the quality of particle on the electrode, its oscillation frequency changes, and can measure the mass concentration of particle according to frequency change.The piezoelectric crystal method equally also need be passed through sampling process, but quartz resonator is very responsive to the variation of its dose,surface, can affect the precision of measuring, so need to clean quartz crystal after using a period of time, the time interval of cleaning decides on particle quality concentration.
Light scattering method is study hotspot in recent years as a kind of comparatively novel measuring concentration of granules in certain method, and dominate.Light scattering method utilizes the optical characteristics of particle, when the sample gas that includes the finite concentration particle is passed through optical region, light beam is because the scattering of particle departs from original direction, in certain angle or zone, pass through photoelectric conversion module, convert scattered light signal to voltage or current signal is sent into the various information that Computer Processing draws particle through amplifying circuit and comparator circuit, in conjunction with the sample gas flow, just can obtain the concentration of particle.Along with the development of laser technology, semi-conductor industry and computer technology, the laser defusing measure technology is more and more ripe, has in succession developed at present dissimilar laser particle size instruments both at home and abroad.
As far back as the seventies in last century, the light scattering method that abroad begun one's study is surveyed the grain technology, but still has so far a lot of weak points, and why light scattering method is used widely within the so short time, be because it is compared with other method, have following unrivaled advantage:
(1) wide adaptability: be adapted to three kinds of form subparticles of solid, liquid, gas and measure.
(2) grain diameter measurement wide ranges: comprehensive multiangular measurement method in recent years, can realize the accurate measurement of striding 6 orders of magnitude from nanometer to millimeter.
(3) good reproducibility speed is fast: because opto-electronic conversion is very rapid, can realize repeatedly real-time online measuring.
(4) robotization and intelligent degree are high: gather surveying work and can realize automatically operation, instrumentation is easy, can save the labour, and avoids the impact of measuring process subjective factor.
Equally, also there is defective in light scattering method, except the instrument processing accuracy requirement is very high, when being used for the actual concentrations measurement, because the impact of temperature, humidity, accuracy of instrument is difficult to guarantee, add that actual shape of particle is irregular and move irregular, very complicated on mathematical approach is processed, therefore, the instrument based on light scattering method also must rely on other basic skills demarcation and the calibrations such as weight method at present.
PM2.5 is because its singularity and complicacy are all gone back Shortcomings to the monitoring method of its concentration at present, and above the whole bag of tricks also can only reflect the concentration of PM2.5 under given conditions.And along with the raising of people's environmental consciousness, and the raising that air quality is required, air pollution treatment work is extremely urgent, and therefore, development can be in real time, the meaning of the particle concentration monitoring device of efficient, Measurement accuracy PM2.5 and other particle size range is very great.
The utility model content
The utility model provides a kind of novel PM2.5 mass concentration real-time monitoring device, can improve speed and degree of accuracy that the PM2.5 mass concentration is measured.
The technical scheme that realizes the utility model purpose is:
A kind of novel PM2.5 mass concentration real-time monitoring device, comprise PM2.5 sampling mechanism, photoelectric measurement mechanism and peripheral auxiliary, unlike the prior art be: also be provided with particle coacervation mechanism, photoelectric measurement mechanism is processed by gas circuit, light path, signal and accessory forms; The gas outlet of PM2.5 sampling mechanism is connected with the air intake opening of particle coacervation mechanism, is connected air intake opening and connects in the gas outlet of particle coacervation mechanism with photoelectric measurement mechanism.
Described cohesion mechanism is linked in sequence by shunting zone, bipolar charge district and condensation region and forms.
Described PM2.5 sampling mechanism is prior art, is used for gathering the air to be detected that only contains PM2.5;
Described particle coacervation mechanism comprises the condensation region three parts of shunting zone, bipolar charge district and the rear end of front end, by cohesion the particle diameter of sample gas is distributed and changes, be convenient to the measurement of follow-up link;
Described shunting zone is Y-shaped structural metal pipeline, the air flow inlet cross section is square, be connected with PM2.5 sampling mechanism air stream outlet, the end of two symmetrical arms is air stream outlet, whole tube section evenly reduces, the cross section, exit is elongated rectangle, and the end of two arms links to each other the outer wall grounding with the air flow inlet of positive and negative porcelain insulation tube chamber respectively.
Described bipolar charge district adopts porcelain drum type brake luminal structure, and the insulating lid that can open is equipped with at the top, and base adopts the porcelain insulating material, and base is provided with connection terminal, and tube chamber axis place is a metal electric hachure.The metal electric hachure is powered by adjustable D. C regulated, and the corona wire upper and lower side is fixed in insulating top cover and the porcelain base.
Described condensation region is that a diameter of section is greater than the tube chamber of 2 times of bipolar charge tube section diameters, interior smooth and insulation, the both sides, top are provided with air flow inlet, air flow inlet links to each other with the air stream outlet of charging area and the cross section is consistent, and air stream outlet is arranged on cylinder bottom center place, and the cross section is square, condensation region air flow inlet pipeline is vertical with the air stream outlet pipeline space, the economy system space, the cavity top arranges can open gland bonnet, is convenient to the regular dismounting cleaning.
Described photoelectric measurement mechanism comprises that light path, gas circuit, signal are processed and several major parts such as accessory, to obtain the more accurate real-time mass concentration data of PM2.5.
Described light source adopts red high brightness laser diode, and monochromaticity, directivity and light beam live width meet the demands.
Described signal picker is the high sensitivity photodetector, has that frequency spectrum is corresponding preferably.Signal processing adopts luminosity DC voltage analyzer and single-particle pulse voltage analyzer, draws respectively the mass concentration of big or small two class particles, finally obtains real-time PM2.5 mass concentration data.
Between each major part of package unit gas meter and air valve are housed all, fluctuate in the reasonable scope in conjunction with airshed is controlled in the adjusting of air pump.
The beneficial effects of the utility model are: novel PM2.5 mass concentration real-time monitoring device and monitoring method that the utility model provides, only measure for the mass concentration of PM2.5 in the air, and it is strong to measure selectivity; By the particle coacervation method, number of particles is reduced, particle diameter increases, and has reduced the data processing amount of device, adopts this apparatus and method, can realize the real-time mass concentration measurement of faster, more accurate PM2.5 under multiple environmental baseline.
Description of drawings
Fig. 1 is the structural representation of particle coacervation mechanism, and arrow is airflow direction among the figure.
Fig. 2 is the detailed block diagram of photoelectric measurement mechanism.
Figure: 1. Gas flowmeter and valve inlet 2.Y shaped shunt tube 3. Porcelain base 4 Terminal 5. Corona wire 6. Bipolar charge pipe 7. Insulating seal cover 8. Closures 9 Coagulation chamber 10. gas meter and valve outlet 11. HEPA filter 12 sample gas inlet 13 light traps 14 optical cavities 15 signal conversion module 16. single particle pulse voltage analyzer 17. hole 18. clean air sets of 19. concave mirror 20. laser beam 21 collimated light beam expander circuit device 22 laser diode 23. exhaust port 24. gas flowmeter 25. adjustable pump 26. airflow buffer chamber 27 protective membrane 28. weighing membrane 29. observation area 30. luminosity DC voltage analyzer 31. integrated data display output modules.
Embodiment
A kind of novel PM2.5 mass concentration real-time monitoring device, formed by PM2.5 sampling mechanism, particle coacervation mechanism, photoelectric measurement mechanism and peripheral auxiliary, the gas outlet of PM2.5 sampling mechanism is connected with air valve entrance 1 with the gas meter of particle coacervation mechanism front end, and the gas meter of particle coacervation mechanism rear end and air valve outlet 10 is connected sample gas entrance 12 and is connected with photoelectric measurement mechanism.
With reference to Fig. 1, particle coacervation mechanism is comprised of the condensation region three parts of Y shape shunting zone 2, bipolar charge district and the rear end of front end, by cohesion the particle diameter of sample gas is distributed and changes, be convenient to the measurement of follow-up link;
Y shape shunting zone 2 is metal Y-shaped structural pipeline, the air flow inlet cross section is square, be connected with the air stream outlet of PM2.5 sampling mechanism, the end of two symmetrical arms is air stream outlet, whole tube section evenly reduces, the cross section, exit is elongated rectangle, and the end of two arms links to each other the outer wall grounding with the air flow inlet of positive and negative porcelain insulation tube chamber respectively.
The bipolar charge district adopts two porcelain drum type brake bipolar charge pipes 6, and the insulated enclosure top cover 7 that can open is equipped with at its top, and porcelain base 3 is adopted in the bottom, and porcelain base 3 is provided with connection terminal 4, and the tube chamber axis place of bipolar charge pipe 6 is provided with a metal electric hachure 5; Metal electric hachure 5 adopts the adjustable D. C regulated power supply, and corona wire 5 upper and lower sides are fixedly connected with porcelain base 3 with insulating top cover 7 respectively.
The condensation region is that a diameter of section is greater than the cohesion chamber 9 of two times of bipolar charge pipe 6 diameter of sections, interior smooth and insulation, the both sides, top are provided with air flow inlet, air flow inlet links to each other with the charging area air stream outlet and the cross section is consistent, and air stream outlet is arranged on cylinder bottom center place, and the cross section is square, condensation region air flow inlet pipeline is vertical with the air stream outlet pipeline space, the economy system space, cohesion cavity top arranges can open gland bonnet 8, is convenient to the regular dismounting cleaning.
With reference to Fig. 2, photoelectric measurement mechanism is comprised of several major parts such as light path, gas circuit, signal processing and accessories, to obtain the more accurate real-time mass concentration data of PM2.5, wherein:
Optical routing light trap 13, optics cavity 14, concave mirror 19, laser beam 20, beam-expanding collimation light path devices 21, laser diode 22 and the area of observation coverage 29 form;
Gas circuit is comprised of HEPA filter membrane 11, sample gas entrance 12, clean air-casing 18, exhausr port 23, gas meter 24, adjustable air pump 25 and air-flow cushion chamber 26;
Signal processing shows that by signal conversion module 15, single-particle pulse voltage analyzer 16, luminosity DC voltage analyzer 30 and integrated data output module 31 forms;
Accessory is comprised of pore 17, protection filter membrane 27 and the filter membrane 28 of weighing.
The principle of work of whole photoelectric measurement mechanism is: the red laser beam 20 that laser diode 22 sends incides after 21 conversion of beam-expanding collimation light path devices on the air-flow in the area of observation coverage 29, transmitted light is fallen into into 13 by light and catches absorption, the part scattered light converges to signal conversion module 15 places by concave mirror 19, this module comprises photodetector and follow-up modulus, amplify, relatively wait change-over circuit, by a suitable voltage threshold is set, the digital voltage signal that produces sent into respectively in single-particle pulse voltage analyzer 16 and the luminosity DC voltage analyzer 30 process, the number of the large pulse signal that single-particle pulse voltage analyzer shows represents the macroparticle number, and the height average can obtain the particle equivalent grain size by the MIE theoretical transformation.By electric pressure being calibrated and carrying out sublevel and process, set sample frequency, real-time analysis each period average voltage and variance are judged macroparticle number and equivalent grain size from the digital correlation aspect.Then only need to collect a certain amount of particle by the filter membrane 28 of weighing, draw the average density of particle, we just can allow device export comparatively accurately macroparticle mass concentration data; For than small-particle (equivalent diameter≤0.5 μ m), its signal reception and handling principle are identical with macroparticle, it is many that small-particle has a number, the characteristics such as signal is weak, but through after the agglomeration process, it is lower that its quality accounts for particle gross mass proportion, so can reflect the luminosity average level that fine particle is real-time by luminosity DC voltage analyzer, but the special configuration particle diameter distributes near the series of standards particle of normal distribution, make it by the air-channel system of mechanism, photometric signal is demarcated, by setting a calibration factor, just can draw the Approximation Quality of small-particle, integrated data shows that output module 31 collects all data that obtain line output of going forward side by side, and residue sample gas is flowed out by exhausr port 23 after through whole photoelectric measurement mechanism.HEPA filter membrane 11, optics cavity 14, pore 17 and clean air-casing 18 several parts form a clean air-casing gas circuit; guarantee that the area of observation coverage is not subjected to the interference of external particles signal; the filter membrane 28 of weighing that device is terminal is used for calibration and calibrating installation; protection filter membrane 27 and air-flow cushion chamber 26 are for the protection of device; it is moved under normal condition, increase the service life.
Described signal picker is the high sensitivity photodetector with preferably spectral response.Signal processing adopts luminosity DC voltage analyzer and single-particle pulse voltage analyzer, measures respectively the mass concentration of big or small two class particles, finally obtains real-time PM2.5 mass concentration data.
Whole air-channel system produces negative pressure by adjustable air pump 25, in conjunction with the control to the gas meter of particle coacervation mechanism and air valve entrance 1, gas meter and air valve outlet 10 and gas meter 24, each regional airshed of assurance device and air pressure are in suitable scope.
Described monitoring method may further comprise the steps:
(1) produce negative pressure by adjustable air pump and make air enter the PM2.5 sampling mechanism, in-house, PM2.5 component separating and with the air-flow bleeder;
(2) the PM2.5 sample air-flow after the separation is through Y shape isocon 2, because the terminal bore of arm dwindles, gas velocity is accelerated and be divided into two stocks not enter in positive and negative two bipolar charge pipes 6;
(3) charged pipe air flow inlet is positioned at the tube chamber bottom and is offset to a side, flat air-flow after the acceleration pastes the inboard eddy current that forms the spiral fashion rising of tube wall, guarantee that air ring is around the 5 operation long periods of corona wire, the corona wire upper and lower side is all fixing, introduce high direct voltage by the connection terminal 4 on the porcelain base 3, high pressure makes corona wire produce electric arc, surrounding air is ionized, free electric charge under the effect of the negative pressure that the High Rotation Speed air-flow produces to around diffusion, adsorbed by the PM2.5 particle in the air-flow, make particle charged, because the voltage of this direct supply is adjustable, the speed that air-flow enters is controlled, therefore can realize the fully charged of particle under the different gas velocities, the insulated enclosure lid 7 on charged pipe top can be opened, and is convenient to cleaning and apparatus for examination and repair;
Positive and negative charge on the difference lotus behind (4) two strands of sample gas process bipolar charge pipes, charged sample gas enters from the pipeline of cohesion both sides, 9 top, chamber respectively, two strands of air-flows converge with different sense of rotation rotations and on cohesion top, chamber along cylinder inner wall, under the effect of electrostatic force, contact and condense with the particle of different electric charges, it is large that particle diameter becomes, numbers of particles significantly reduces, and especially the fines composition is convenient to measurement device.Under Action of Gravity Field, particle is with air descend, flows out from cohesion chamber bottom center pipeline, and the top, chamber also is provided with gland bonnet 8, its function and insulated enclosure cover 7 basic identical;
(5) air-flow after agglomeration process enters photoelectric measurement mechanism from sample gas entrance 12, photoelectric measurement mechanism comprises gas circuit, light path, signal processing output and slave part, and wherein light path part is comprised of light trap 13, optics cavity 14, concave mirror 19, laser beam 20, beam-expanding collimation light path devices 21, laser diode 22 and the area of observation coverage 29; Gas circuit is comprised of HEPA filter membrane 11, sample gas entrance 12, clean air-casing 18, exhausr port 23, gas meter 24, adjustable air pump 25 and air-flow cushion chamber 26; Signal processing shows that by signal conversion module 15, single-particle pulse voltage analyzer 16, luminosity DC voltage analyzer 30 and integrated data output module 31 forms; Accessory is comprised of pore 17, protection filter membrane 27 and the filter membrane 28 of weighing.
The utility model is by above apparatus and method, can realize the measurement of PM2.5 mass concentration in the air under the multiple environmental baseline, by reducing the number of particle in the sample gas, increase the basic means such as particle diameter, realize faster, more accurate, monitor the target of PM2.5 mass concentration more in real time, satisfy the demand of association area.
The above only is preferred embodiment of the present utility model, and is in order to limit the utility model, not all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (6)
1. novel PM2.5 mass concentration real-time monitoring device, comprise PM2.5 sampling mechanism, photoelectric measurement mechanism and peripheral auxiliary, it is characterized in that: also be provided with particle coacervation mechanism, photoelectric measurement mechanism is processed by gas circuit, light path, signal and accessory forms; The gas outlet of PM2.5 sampling mechanism is connected with the air intake opening of particle coacervation mechanism, is connected air intake opening and connects in the gas outlet of particle coacervation mechanism with photoelectric measurement mechanism.
2. device according to claim 1 is characterized in that: described cohesion mechanism is linked in sequence by shunting zone, bipolar charge district and condensation region and forms.
3. device according to claim 2, it is characterized in that: described shunting zone is Y-shaped structural metal pipeline, the air flow inlet cross section is square, be connected with PM2.5 sampling mechanism air stream outlet, the end of two symmetrical arms is air stream outlet, and whole tube section evenly reduces, and the cross section, exit is elongated rectangle, the end of two arms links to each other the outer wall grounding with the air flow inlet of positive and negative porcelain insulation tube chamber respectively.
4. device according to claim 2, it is characterized in that: described bipolar charge district adopts the charged pipe of porcelain drum type brake, and the insulating lid that can open is equipped with at the top, and base adopts the porcelain insulating material, base is provided with connection terminal, and tube chamber axis place is a metal electric hachure.
5. device according to claim 4 is characterized in that: the metal electric hachure adopts the adjustable D. C regulated power supply, and the corona wire upper and lower side is fixed in insulating top cover and the porcelain base.
6. device according to claim 2, it is characterized in that: described condensation region is that a diameter of section is greater than the tube chamber of two times of bipolar charge tube section diameters, interior smooth and insulation, the both sides, top are provided with air flow inlet, air flow inlet links to each other with the charging area air stream outlet and the cross section is consistent, and air stream outlet is arranged on cylinder bottom center place, and the cross section is square, condensation region air flow inlet pipeline is vertical with the air stream outlet pipeline space, and the cavity top arranges can open gland bonnet.
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| CN201220522529.6U CN202869934U (en) | 2012-10-12 | 2012-10-12 | Novel real-time monitoring device for mass concentration of PM2.5 |
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| CN201220522529.6U CN202869934U (en) | 2012-10-12 | 2012-10-12 | Novel real-time monitoring device for mass concentration of PM2.5 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018145A (en) * | 2012-10-12 | 2013-04-03 | 桂林电子科技大学 | Novel real-time PM2.5 (particulate matter 2.5) mass concentration monitoring device and monitoring method |
| CN110487689A (en) * | 2018-05-14 | 2019-11-22 | 扬州大学 | Measuring and calculating of the fugitive dust particulate matter in proximate region with respect to mean concentration and comparative approach in city |
| CN110954453A (en) * | 2018-09-27 | 2020-04-03 | 财团法人工业技术研究院 | Suspended particle sensing device |
| CN114459958A (en) * | 2022-02-11 | 2022-05-10 | 华北电力大学（保定） | Device and method for rapid measurement of airflow characteristics |
| CN115791554A (en) * | 2023-01-06 | 2023-03-14 | 南京理工大学 | Powder dynamic concentration measuring device and method |
-
2012
- 2012-10-12 CN CN201220522529.6U patent/CN202869934U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018145A (en) * | 2012-10-12 | 2013-04-03 | 桂林电子科技大学 | Novel real-time PM2.5 (particulate matter 2.5) mass concentration monitoring device and monitoring method |
| CN110487689A (en) * | 2018-05-14 | 2019-11-22 | 扬州大学 | Measuring and calculating of the fugitive dust particulate matter in proximate region with respect to mean concentration and comparative approach in city |
| CN110487689B (en) * | 2018-05-14 | 2022-02-18 | 扬州大学 | Method for measuring, calculating and comparing relative average concentration of dust particles in similar areas in city |
| CN110954453A (en) * | 2018-09-27 | 2020-04-03 | 财团法人工业技术研究院 | Suspended particle sensing device |
| CN114459958A (en) * | 2022-02-11 | 2022-05-10 | 华北电力大学（保定） | Device and method for rapid measurement of airflow characteristics |
| CN115791554A (en) * | 2023-01-06 | 2023-03-14 | 南京理工大学 | Powder dynamic concentration measuring device and method |
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