CN107655799B - A kind of Portable movable discharge of pollutant sources particle sampling measuring system and method - Google Patents
A kind of Portable movable discharge of pollutant sources particle sampling measuring system and method Download PDFInfo
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- CN107655799B CN107655799B CN201710871512.9A CN201710871512A CN107655799B CN 107655799 B CN107655799 B CN 107655799B CN 201710871512 A CN201710871512 A CN 201710871512A CN 107655799 B CN107655799 B CN 107655799B
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- 239000002245 particle Substances 0.000 title claims abstract description 84
- 238000005070 sampling Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 10
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 10
- 238000010790 dilution Methods 0.000 claims abstract description 109
- 239000012895 dilution Substances 0.000 claims abstract description 109
- 239000000523 sample Substances 0.000 claims abstract description 81
- 238000002156 mixing Methods 0.000 claims abstract description 43
- 238000000926 separation method Methods 0.000 claims abstract description 38
- 238000005259 measurement Methods 0.000 claims abstract description 33
- 150000002500 ions Chemical class 0.000 claims description 29
- 239000013618 particulate matter Substances 0.000 claims description 19
- 230000035699 permeability Effects 0.000 claims description 16
- 230000005684 electric field Effects 0.000 claims description 15
- 150000001450 anions Chemical class 0.000 claims description 13
- 239000007921 spray Substances 0.000 claims description 12
- 239000003085 diluting agent Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 230000002452 interceptive effect Effects 0.000 claims description 2
- 239000012470 diluted sample Substances 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000007812 deficiency Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 5
- 239000000443 aerosol Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 238000010943 off-gassing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization 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
- G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
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- Sampling And Sample Adjustment (AREA)
Abstract
The present invention relates to a kind of Portable movable discharge of pollutant sources particle sampling measuring system and methods.Sampled measurements system includes air compressor machine, drier, filter, heater, particle sampling measurement module and sampling probe.The outlet of the air compressor machine connects the entrance of drier, and the outlet of drier connects the entrance of filter.The particle sampling measurement module includes dilution module, discharge module, mixing module, separation module and electrometer.The present invention is able to solve the deficiencies in the prior art, realizes sampling and measurement to high temperature, the high concentration particle object of mobile pollution source discharge, and is able to maintain stable thinner ratio.
Description
Technical field
The present invention relates to mobile pollution source environmental monitoring technology fields, and in particular to a kind of Portable movable discharge of pollutant sources
Particle sampling measuring system and method.
Background technique
The aerosol generated in burning and other industrial process usually has very wide characteristic range.Granule density, temperature, phase
Humidity is varied widely in same process.Distribution of particles changes with the characteristic changing of aerosol, in sampling process
There is the appearance of phenomena such as flocculation, condensation, forming core.Effective sample is extracted in the process from such, applied sampling equipment is proposed
Higher requirement.In order to obtain one it is effective as a result, dilution rate, dilution temperature, residence time must be subject to strict control.
For the Particulate Emission problem for coping with internal combustion engine, Environmental Protection Agency USA (EPA) was defined in 1972 for detecting
The measurement method of diesel particulates flows constant volume dilution Sampling (CVS) entirely.Survey full stream CVS mature as one
Method for testing is widely used in each engine detection test room in the world.But Full flow dilution sampling system volume is big, manufacture at
This height, cost of use are high, it is impossible to be used in vehicle-mounted.Chinese patent CN100395533C discloses a kind of fixed combustion source emission particle
Object diluting and sampling system uses two-stage dilution, and level-one dilution and secondary dilution are separated, not only will increase pipeline in this way
Transmission loss and make sampling system volume increase be difficult to realize portability, in addition to this, secondary dilution is only with multiple sprays
Hole injection, can make dilution air flow uneven, it is difficult to ensure that thinner ratio stability.Therefore, it is necessary to design one kind to be able to maintain stabilization
Thinner ratio and diluent gas temperature sampling system, and system portableization can be used for sample aerated particle object dilution sampling.
Summary of the invention
The purpose of the present invention is to provide a kind of Portable movable discharge of pollutant sources particle sampling measuring system and method,
The measuring system and method are able to solve the deficiencies in the prior art, high temperature, high concentration to mobile pollution source discharge
Grain object realizes sampling and measurement, and is able to maintain stable thinner ratio.
To achieve the above object, the invention adopts the following technical scheme:
A kind of Portable movable discharge of pollutant sources particle sampling measuring system, including air compressor machine, drier, filter,
Heater, particle sampling measurement module and sampling probe；The outlet of the air compressor machine connects the entrance of drier, and drier goes out
Mouth connects the entrance of filter.
Specifically, the particle sampling measurement module includes dilution module, discharge module, mixing module, splitting die
Block and electrometer.
The dilution module includes the first dilution tunnel, the second dilution tunnel, sample tracheae and permeability cell；The sample tracheae packet
It includes and is sequentially connected the first logical pipeline, the second pipeline and third pipeline；First pipeline is the hollow cylinder of both ends open, the
Two pipelines and third pipeline are symmetrically arranged two hollow round table, and two hollow round table are in the two junction diameter minimum；
The permeability cell is set in the outside of the first pipeline；First dilution tunnel is set in the outside of permeability cell；Described second is dilute
The outlet for releasing pipeline is connected to the junction of two hollow round table, and the second dilution tunnel is connected with two hollow round table.
The discharge module includes discharging chamber, is arranged and is provided with discharge cavity in the intracorporal spray point of discharge cavity and respectively
The ion outlet and pure air entrance of two sides above and below body.
The mixing module includes mixing chamber, the dilution sample gas inlet being provided on the upside of mixing chamber, is provided with mixing
Electrically charged particle object outlet on the right side of cavity；The dilution sample gas inlet connects the outlet of third pipeline.
The separation module includes separating chamber, is arranged in the intracorporal separation electrode of disengagement chamber, is provided with a separating chamber left side
The separating granular entrance of side and the separating granular being provided on the upside of separating chamber outlet；The separating granular entrance connects
The outlet of electrically charged particle object；The ion outlet is connected on mixing chamber, and is connected with mixing chamber.
The electrometer is mounted on separating granular exit.
The outlet of the filter connects the entrance of heater, the entrance of the second dilution tunnel, pure air entrance respectively；Institute
The outlet for stating heater connects the entrance of the first dilution tunnel；The inlet of sample tracheae is arranged in the sampling probe.
Further, which further includes first flowmeter, second flowmeter, third flowmeter, the first pressure
Power meter, second pressure meter, third pressure gauge, the first thermometer, second temperature meter and third thermometer；The first flowmeter,
First pressure meter and the first thermometer are arranged on the pipeline between heater outlet and the first dilution tunnel entrance；Described second
Flowmeter, second pressure meter and second temperature meter are arranged on the pipeline between filter outlet and the second dilution tunnel entrance；
The pipeline between filter outlet and pure air entrance is arranged in the third flowmeter, third pressure gauge and third thermometer
On.
Further, which further includes host computer and electronic control unit；The host computer and electronic control unit are handed over
Mutual formula connection；The output end of the electronic control unit connects heater, first flowmeter, second flowmeter and third flowmeter respectively
Control terminal.
Further, the ion outlet be both ends open shaped hollow round table, and the diameter of the ion outlet on to
Under become larger.
Further, the spray point is mounted in fixing seat.
Further, the shell of the dilution module uses stainless steel material, and the permeability cell is described to put using ventilative steel
Acusector uses tungsten material, and the separation electrode uses copper material.
(1) compressed air that air compressor machine generates obtains pure air after drier and filter；
(2) pure air is divided into three tunnels: the first via obtains hot-air after heater heats, and hot-air is by first-class
Enter in the first dilution tunnel of particle sampling measurement module after meter, if the gas flow in the first via is Q1；Second tunnel
Enter in the second dilution tunnel of particle sampling measurement module after second flowmeter, if the gas flow in the second tunnel is
Q2；Third road is entered in discharge module after third flowmeter by pure air entrance, if the gas flow in third road is
Q3；
(3) sample aerated particle object is entered the sample tracheae of particle sampling measurement module by sampling probe, by the first dilution tunnel
The hot-air flowed into mixes in sample tracheae with tail gas after passing through permeability cell, completes the first order dilution of sample aerated particle object,
The dilution is heat dilution；The first order dilutes mixed gas and continues to move to the bottom of particle sampling measurement module,
When by the junction of the second pipeline and third pipeline, since the speed of the pure air in the second dilution tunnel reaches at this
To maximum, negative pressure is formed, mixed gas is diluted to the first order and plays the role of extraction, accelerate the mixing of gas, completes sample
The second level dilution of aerated particle object, the dilution are room temperature dilution；Sample aerated particle object after secondary dilution is by dilute
It releases sample gas inlet and enters mixing module；
(4) negative 3KV high pressure, the discharge module earthing of casing being accessed into fixing seat end, electric discharge needle tip generates point discharge,
Ionization enters the pure air air-flow of discharge module, and pure air air-flow is made to generate a large amount of anion；
(5) under the promotion of pure air air-flow, the anion in discharge module enters mixing module by ion outlet,
As the section of ion outlet is gradually reduced, the flow velocity of ion is become larger；
(6) the sample aerated particle object for entering mixing module by dilution sample gas inlet enters the negative of mixing module with by ion outlet
Ion collides in mixing chamber, and anion is attached on sample aerated particle object, completes the electrification of sample aerated particle object, obtains one
Particle size range particulate matter is determined in the elementary charge number n of charging efficiency P and particulate matter the institute band in charged region；The sample gas of electrification
Particulate matter enters separation module by the outlet of electrically charged particle object；
(7) separation electrode is accessed into negative 100V voltage, the separation module earthing of casing, thus in separation electrode and separation module
Separation electric field is formed in annular region between inner wall；Extra anion is divided under the action of separating the electric field force of electric field
It is collected from module inner wall, electrification sample aerated particle object is under the action of the electric field force of pure air air-flow and separation electric field, by separating
Particulate matter outlet outflow, at this point, the current value I of the particulate matter using electrometer measurement separating granular outlet outflow, if into
The flow of the gas of electrometer is Q；
(8) pressure for the hot-air being input in the first dilution tunnel is monitored respectively using first pressure meter and the first thermometer
Power and temperature；Using second pressure meter and second temperature meter monitor respectively the air being input in the second dilution tunnel pressure and
Temperature；Monitor the pressure and temperature for being input to the air of pure air entrance respectively using third pressure gauge and third thermometer；
(9) it uses the temperature of electronic control unit control heater to adjust the temperature of diluent gas, and controls first flow
Meter, second flowmeter and third flowmeter flow obtain the flow of different dilution air flows；
(10) thinner ratio μ is monitored using host computer, and control electronic control unit adjust first flowmeter, second flowmeter and
Third flowmeter obtains the flow of different dilution air flows, to obtain different thinner ratios；
(11) formula N=μ * I/ (P*n*e* (Q-Q1-Q2-Q3)) is used, the particulate count in motor-vehicle tail-gas is calculated
Concentration；
Wherein, N indicates that sample aerated particle object Particle density, thinner ratio μ=Q/(Q-Q1-Q2-Q3), I are separating granular outlet
In particulate matter current value, e be single charge electricity.
Compared to the prior art, the invention has the following advantages:
(1) sampled measurements system of the present invention has the characteristics that structure is simple and convenient to operate, by dilution module and survey
Being integrated into a structure for amount module, can reduce loss of the particulate matter in transmission process, guarantee the accurate of sampled result
Property, and whole system can be made to minimize, portability.
(2) sampled measurements system of the present invention is using ventilative steel as diluent gas inlet duct, it is ensured that dilute
Outgassing stream is uniform and stable to be entered in sample tracheae, and the divergence loss of sample aerated particle object is reduced.
(3) present invention can realize on-line measurement to the particulate matter for the high temperature, high concentration that mobile pollution source is discharged.
(4) for the present invention by three tunnel dilution air flows of setting, thinner ratio adjustable range is big, can particulate matter to high concentration it is complete
At measurement.It is combined by heat dilution and cold dilution, guarantees that nanoparticles will not be condensed growths, the survey of realization high-temperature particle object
Amount.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of measuring system in the present invention；
Fig. 2 is the structural schematic diagram of particle sampling measurement module in the present invention；
Fig. 3 is the scheme of installation of spray point in discharge module in the present invention.
Wherein:
1, air compressor machine, 2, drier, 3, filter, 4, heater, 5, first flowmeter, 6, second flowmeter, 7, automatically controlled
Unit, 8, sampling probe, 9, particle sampling measurement module, 10, host computer, 11, second pressure meter, 12, second temperature meter,
13, first pressure meter, the 14, first thermometer, 15, third pressure gauge, 16, third thermometer, 17, third flowmeter, 21, dilution
Module, the 22, first dilution tunnel, the 23, second dilution tunnel, 24, sample tracheae, 25, permeability cell, 31, discharge module, 32, fixation
Seat, 34, spray point, 33, pure air entrance, 35, ion outlet, 41, mixing module, 42, dilution sample gas inlet, 43, mixing
Cavity, 44, the outlet of electrically charged particle object, 51, separation module, 52, separation electrode, 53, separating granular outlet, 54, separation particle
Object entrance, 55, electrometer.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
A kind of Portable movable discharge of pollutant sources particle sampling measuring system as shown in FIG. 1 to FIG. 3, including air compressor machine
1, drier 2, filter 3, heater 4, particle sampling measurement module 9 and sampling probe 8.The outlet of the air compressor machine 1 connects
The entrance of drier 2, the outlet of drier 2 connect the entrance of filter 3.
Specifically, the particle sampling measurement module 9 include dilution module 21, discharge module 31, mixing module 41,
Separation module 51 and electrometer 55.
The dilution module 21 includes the first dilution tunnel 22, the second dilution tunnel 23, sample tracheae 24 and permeability cell 25.Institute
Stating sample tracheae 24 includes being sequentially connected the first logical pipeline, the second pipeline and third pipeline；First pipeline is both ends open
Hollow cylinder, the second pipeline and third pipeline are symmetrically arranged two hollow round table, and two hollow round table connect in the two
It is minimum to connect place's diameter, design in this way can guarantee that diluent gas increases into pressure at sample feed channel with 5, accelerate into sample tracheae
Road, in this way design prevent sample gas from entering in dilution tunnel and bring measurement loss.The permeability cell 25 is set in the first pipeline
Outside；First dilution tunnel 22 is set in the outside of permeability cell 25.The outlet of second dilution tunnel 23 is connected to two
The junction of a hollow round table, and the second dilution tunnel 23 is connected with two hollow round table.
The discharge module 31 includes that discharging chamber, setting are put in the intracorporal spray point 34 of discharge cavity and being provided with respectively
The ion outlet 35 and pure air entrance 33 of two sides above and below electric cavity.The ion outlet 35 is the hollow round table of both ends open
Shape, and the diameter of the ion outlet 35 becomes larger from the top down, design in this way can guarantee that ion acceleration enters mixing module
In, increase ion and sample aerated particle object collision opportunity, while guaranteeing that sample gas will not enter in discharging chamber.
The mixing module 41 includes mixing chamber, the dilution sample gas inlet 42 being provided on the upside of mixing chamber, is provided with
Electrically charged particle object outlet 44 on the right side of mixing chamber.The dilution sample gas inlet 42 connects the outlet of third pipeline.
The separation module 51 includes separating chamber, is arranged in the intracorporal separation electrode 52 of disengagement chamber, is provided with disengagement chamber
Separating granular entrance 54 on the left of body and the separating granular being provided on the upside of separating chamber outlet 53.The separation particle
Object entrance 54 connects electrically charged particle object outlet 44.The ion outlet 35 is connected on mixing chamber, and is connected with mixing chamber.
The electrometer 55 is mounted at separating granular outlet 53.
The outlet of the filter 3 connects the entrance of heater 4 respectively, entrance, the pure air of the second dilution tunnel 23 enter
Mouth 33.The outlet of the heater 4 connects the entrance of the first dilution tunnel 22.Entering for sample tracheae 24 is arranged in the sampling probe 8
At mouthful.
Further, which further includes first flowmeter 5, second flowmeter 6, third flowmeter 17,
One pressure gauge 13, second pressure meter 11, third pressure gauge 15, the first thermometer 14, second temperature meter 12 and third thermometer 16.
The first flowmeter 5, first pressure meter 13 and the setting of the first thermometer 14 export to enter with the first dilution tunnel 22 in heater 4
On pipeline between mouthful.The second flowmeter 6, second pressure meter 11 and second temperature meter 12 setting filter 3 outlet with
On pipeline between second dilution tunnel, 23 entrance.The third flowmeter 17, third pressure gauge 15 and third thermometer 16 are set
It sets on the pipeline between the outlet of filter 3 and pure air entrance 33.
Further, which further includes host computer 10 and electronic control unit 7.The host computer 10 and automatically controlled list
The interactive connection of member 7.The output end of the electronic control unit 7 connects heater 4, first flowmeter 5, second flowmeter 6 and respectively
The control terminal of three flowmeters 17.
Further, the spray point 34 is mounted in fixing seat 32.The spray point 34 includes being symmetrically mounted on fixation
Two on seat 32.
Further, the shell of the dilution module 21 uses stainless steel material.The permeability cell 25 is using ventilative steel.Institute
It states spray point 34 and uses tungsten material.The separation electrode 52 uses copper material.
The invention further relates to a kind of measurement methods of above-mentioned measuring system, method includes the following steps:
(1) compressed air that air compressor machine generates obtains pure air after drier and filter；
(2) pure air is divided into three tunnels: the first via obtains hot-air after heater heats, and hot-air is by first-class
Enter in the first dilution tunnel of particle sampling measurement module after meter, if the gas flow in the first via is Q1；Second tunnel
Enter in the second dilution tunnel of particle sampling measurement module after second flowmeter, if the gas flow in the second tunnel is
Q2；Third road is entered in discharge module after third flowmeter by pure air entrance, if the gas flow in third road is
Q3；
(3) sample aerated particle object is entered the sample tracheae of particle sampling measurement module by sampling probe, by the first dilution tunnel
The hot-air flowed into mixes in sample tracheae with tail gas after passing through permeability cell, completes the first order dilution of sample aerated particle object,
The dilution is heat dilution；The first order dilutes mixed gas and continues to move to the bottom of particle sampling measurement module,
When by the junction of the second pipeline and third pipeline, since the speed of the pure air in the second dilution tunnel reaches at this
To maximum, negative pressure is formed, mixed gas is diluted to the first order and plays the role of extraction, accelerate the mixing of gas, completes sample
The second level dilution of aerated particle object, the dilution are room temperature dilution；Sample aerated particle object after secondary dilution is by dilute
It releases sample gas inlet and enters mixing module；
(4) negative 3KV high pressure, the discharge module earthing of casing being accessed into fixing seat end, electric discharge needle tip generates point discharge,
Ionization enters the pure air air-flow of discharge module, and pure air air-flow is made to generate a large amount of anion；
(5) under the promotion of pure air air-flow, the anion in discharge module enters mixing module by ion outlet,
As the section of ion outlet is gradually reduced, the flow velocity of ion is become larger；
(6) the sample aerated particle object for entering mixing module by dilution sample gas inlet enters the negative of mixing module with by ion outlet
Ion collides in mixing chamber, and anion is attached on sample aerated particle object, completes the electrification of sample aerated particle object, obtains one
Particle size range particulate matter is determined in the elementary charge number n of charging efficiency P and particulate matter the institute band in charged region；The sample gas of electrification
Particulate matter enters separation module by the outlet of electrically charged particle object；
(7) separation electrode is accessed into negative 100V voltage, the separation module earthing of casing, thus in separation electrode and separation module
Separation electric field is formed in annular region between inner wall；Extra anion is divided under the action of separating the electric field force of electric field
It is collected from module inner wall, electrification sample aerated particle object is under the action of the electric field force of pure air air-flow and separation electric field, by separating
Particulate matter outlet outflow, at this point, the current value I of the particulate matter using electrometer measurement separating granular outlet outflow, if into
The flow of the gas of electrometer is Q；
(8) pressure for the hot-air being input in the first dilution tunnel is monitored respectively using first pressure meter and the first thermometer
Power and temperature；Using second pressure meter and second temperature meter monitor respectively the air being input in the second dilution tunnel pressure and
Temperature；Monitor the pressure and temperature for being input to the air of pure air entrance respectively using third pressure gauge and third thermometer；
(9) it uses the temperature of electronic control unit control heater to adjust the temperature of diluent gas, and controls first flow
Meter, second flowmeter and third flowmeter flow obtain the flow of different dilution air flows；
(10) thinner ratio μ is monitored using host computer, and control electronic control unit adjust first flowmeter, second flowmeter and
Third flowmeter obtains the flow of different dilution air flows, to obtain different thinner ratios；
(11) formula N=μ * I/ (P*n*e* (Q-Q1-Q2-Q3)) is used, the particulate count in motor-vehicle tail-gas is calculated
Concentration；
Wherein, N indicates that sample aerated particle object Particle density, thinner ratio μ=Q/(Q-Q1-Q2-Q3), I are separating granular outlet
In particulate matter current value, e be single charge electricity.
Thinner ratio μ above refers to the thinner ratio of whole system, the μ=(stream of the diluent gas of sample throughput+all
Amount)/sample gas flow.In the present invention, the flow of diluent gas is divided into three parts, enters in the first and second dilution tunnels
Diluent gas and the diluent gas entered from bottom pure air entrance 33, this three parts diluent gas all have to sample gas
Diluting effect.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (4)
1. a kind of Portable movable discharge of pollutant sources particle sampling measuring system, it is characterised in that: including air compressor machine, drying
Device, filter, heater, particle sampling measurement module and sampling probe；The outlet of the air compressor machine connects the entrance of drier,
The outlet of drier connects the entrance of filter；
The particle sampling measurement module includes dilution module, discharge module, mixing module, separation module and electrometer；
The dilution module includes the first dilution tunnel, the second dilution tunnel, sample tracheae and permeability cell；The sample tracheae include according to
Secondary the first pipeline being connected, the second pipeline and third pipeline；First pipeline is the hollow cylinder of both ends open, the second pipe
Road and third pipeline are symmetrically arranged two hollow round table, and two hollow round table are in the two junction diameter minimum；It is described
Permeability cell is set in the outside of the first pipeline；First dilution tunnel is set in the outside of permeability cell；Second dilution tube
The outlet in road is connected to the junction of two hollow round table, and the second dilution tunnel is connected with two hollow round table；
The discharge module includes discharging chamber, is arranged and is provided on discharging chamber in the intracorporal spray point of discharge cavity and respectively
The ion outlet and pure air entrance of lower two sides；
The mixing module includes mixing chamber, the dilution sample gas inlet being provided on the upside of mixing chamber, is provided with mixing chamber
The electrically charged particle object on right side exports；The dilution sample gas inlet connects the outlet of third pipeline；
The separation module includes separating chamber, the intracorporal separation electrode of disengagement chamber is arranged in, is provided on the left of separating chamber
Separating granular entrance and the separating granular being provided on the upside of separating chamber outlet；The separating granular entrance connects charged
Particulate matter outlet；The ion outlet is connected on mixing chamber, and is connected with mixing chamber；
The electrometer is mounted on separating granular exit；
The outlet of the filter connects the entrance of heater, the entrance of the second dilution tunnel, pure air entrance respectively；It is described to add
The outlet of hot device connects the entrance of the first dilution tunnel；The inlet of sample tracheae is arranged in the sampling probe；
Further include first flowmeter, second flowmeter, third flowmeter, first pressure meter, second pressure meter, third pressure gauge,
First thermometer, second temperature meter and third thermometer；The first flowmeter, first pressure meter and the setting of the first thermometer exist
On pipeline between heater outlet and the first dilution tunnel entrance；The second flowmeter, second pressure meter and second temperature
Meter is arranged on the pipeline between filter outlet and the second dilution tunnel entrance；The third flowmeter, third pressure gauge and
Third thermometer is arranged on the pipeline between filter outlet and pure air entrance；
It further include host computer and electronic control unit；The host computer is connect with electronic control unit interactive mode；The output of the electronic control unit
End connects heater, first flowmeter, the control terminal of second flowmeter and third flowmeter respectively；The spray point is mounted on fixation
On seat.
2. a kind of Portable movable discharge of pollutant sources particle sampling measuring system according to claim 1, feature exist
In: the ion outlet is the shaped hollow round table of both ends open, and the diameter of the ion outlet becomes larger from the top down.
3. a kind of Portable movable discharge of pollutant sources particle sampling measuring system according to claim 1, feature exist
In: the shell of the dilution module uses stainless steel material, and the permeability cell uses tungsten material using ventilative steel, the spray point
Matter, the separation electrode use copper material.
4. the measurement method of measuring system described in any one according to claim 1 ~ 3, it is characterised in that: this method include with
Lower step:
(1) compressed air that air compressor machine generates obtains pure air after drier and filter；
(2) pure air is divided into three tunnels: the first via obtains hot-air after heater heats, and hot-air passes through first flowmeter
Enter in the first dilution tunnel of particle sampling measurement module afterwards, if the gas flow in the first via is Q1；Second tunnel is passed through
Enter in the second dilution tunnel of particle sampling measurement module after second flowmeter, if the gas flow in the second tunnel is Q2；
Third road is entered in discharge module after third flowmeter by pure air entrance, if the gas flow in third road is Q3；
(3) sample aerated particle object is entered the sample tracheae of particle sampling measurement module by sampling probe, is flowed by the first dilution tunnel
Hot-air pass through permeability cell after mix in sample tracheae with tail gas, completion sample aerated particle object first order dilution, this is dilute
Releasing process is heat dilution；The first order dilutes mixed gas and continues to move to the bottom of particle sampling measurement module, is passing through
When crossing junction of second pipeline with third pipeline, since the speed of the pure air in the second dilution tunnel reaches most at this
Greatly, negative pressure is formed, mixed gas is diluted to the first order and plays the role of extraction, accelerates the mixing of gas, completes sample gas
The second level dilution of grain object, the dilution are room temperature dilution；Sample aerated particle object after secondary dilution is by diluted sample
Gas entrance enters mixing module；
(4) negative 3KV high pressure, the discharge module earthing of casing are accessed into fixing seat end, electric discharge needle tip generates point discharge, ionization
Into the pure air air-flow of discharge module, pure air air-flow is made to generate a large amount of anion；
(5) under the promotion of pure air air-flow, the anion in discharge module enters mixing module by ion outlet, with
The section of ion outlet is gradually reduced, and the flow velocity of ion becomes larger；
(6) enter the sample aerated particle object of mixing module and the anion for entering mixing module by ion outlet by dilution sample gas inlet
It collides in mixing chamber, anion is attached on sample aerated particle object, is completed the electrification of sample aerated particle object, is obtained certain grain
Elementary charge number n of the diameter range of particle object in charging efficiency P and particulate matter the institute band in charged region；The sample aerated particle of electrification
Object enters separation module by the outlet of electrically charged particle object；
(7) separation electrode is accessed into negative 100V voltage, the separation module earthing of casing, thus in separation electrode and separation module inner wall
Between annular region in formed separation electric field；Extra anion is under the action of separating the electric field force of electric field, by splitting die
Block inner wall is collected, and electrification sample aerated particle object is under the action of the electric field force of pure air air-flow and separation electric field, by separation particle
Object outlet outflow, at this point, the current value I of the particulate matter using electrometer measurement separating granular outlet outflow, if into electrostatic
The flow of the gas of meter is Q；
(8) monitor respectively using first pressure meter and the first thermometer the pressure of the hot-air being input in the first dilution tunnel with
Temperature；Monitor the pressure and temperature of the air being input in the second dilution tunnel respectively using second pressure meter and second temperature meter
Degree；Monitor the pressure and temperature for being input to the air of pure air entrance respectively using third pressure gauge and third thermometer；
(9) it uses the temperature of electronic control unit control heater to adjust the temperature of diluent gas, and controls first flowmeter, the
The flow of two flowmeters and third flowmeter obtains the flow of different dilution air flows；
(10) thinner ratio μ is monitored using host computer, and is controlled electronic control unit and adjusted first flowmeter, second flowmeter and third
Flowmeter obtains the flow of different dilution air flows, to obtain different thinner ratios；
(11) formula N=μ * I/ (P*n*e* (Q-Q1-Q2-Q3)) is used, the particulate count being calculated in motor-vehicle tail-gas is dense
Degree；
Wherein, N indicates that sample aerated particle object Particle density, thinner ratio μ=Q/(Q-Q1-Q2-Q3), I are in separating granular outlet
The current value of particulate matter, e are the electricity of single charge.
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| CN108426810A (en) * | 2018-03-16 | 2018-08-21 | 天津大学 | A kind of measuring device of particulate in air mean concentration |
| CN108716992A (en) * | 2018-06-18 | 2018-10-30 | 宁波工程学院 | A kind of bipolar charge-cyclone dust removal experimental provision |
| CN109283110A (en) * | 2018-11-14 | 2019-01-29 | 宋茜 | A kind of different-grain diameter air-anion concentration measurement method and device |
| CN110068526A (en) * | 2019-04-03 | 2019-07-30 | 华电电力科学研究院有限公司 | A kind of particulate matter on-line dilution sampled measurements system and method |
| CN110118709B (en) * | 2019-04-17 | 2024-04-12 | 华电电力科学研究院有限公司 | Online grading sampling measurement system capable of capturing particulate matters and online grading sampling measurement method thereof |
| CN110411925B (en) * | 2019-07-26 | 2022-02-08 | 中节能天融科技有限公司 | System and method for measuring ultrafine particles based on surface acoustic wave technology |
| CN112781969A (en) * | 2019-11-06 | 2021-05-11 | 中国石油化工股份有限公司 | Gas dilution device and method for online monitoring |
| CN113049320A (en) * | 2021-04-13 | 2021-06-29 | 北京工业大学 | Method and device for real-time quantitative sampling of exhaust gas for measuring particulate matters in automobile exhaust |
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