CN105910965A - Humidity adjusting device and method of aerosol collection sample feeding gas flow and measurement instrument - Google Patents
Humidity adjusting device and method of aerosol collection sample feeding gas flow and measurement instrument Download PDFInfo
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- CN105910965A CN105910965A CN201610340204.9A CN201610340204A CN105910965A CN 105910965 A CN105910965 A CN 105910965A CN 201610340204 A CN201610340204 A CN 201610340204A CN 105910965 A CN105910965 A CN 105910965A
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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
Abstract
The invention provides a humidity adjusting device of an aerosol collection sample feeding gas flow. The humidity adjusting device comprises a drying unit (3) and a control system (4), wherein the drying unit comprises at least two drying pipes; each drying pipe comprises an inner pipe for the sample feeding gas flow to pass through, a unidirectional vapor transmission film which covers on an outer wall of the inner pipe and is used for water vapor in the sample feeding gas flow to pass, and an outer pipe which is located at the outsides of the inner pipe and the unidirectional vapor transmission film and forms a space with the inner pipe, wherein the space is filled with a drying agent; and the control system (4) is used for controlling the sample feeding gas flow to enter the other at least one drying pipe when the drying agent in a certain drying agent is inactive. The device is provided with the vapor transmission osmosis film and excessive water vapor is removed by utilizing a water vapor pressure difference principle, so that the loss of volatile matters in particles, caused by heating, is avoided, and the accuracy and reliability of measurement results of subsequent physicochemical and optical properties of the particles are guaranteed.
Description
Technical field
The present invention relates to measuring method and device, gather sample introduction air-flow further to a kind of aerosol
Humidity control apparatus, and apply the control method of this humidity control apparatus, and comprise this humidity tune
The measuring instrument for atmospheric particulate matter device of regulating device.
Background technology
Atmospheric particulates refer to dispersed aerial solid-state or liquid particles shape material, according to
Its size, can divide again overall suspended pellet (TSP) and pellet (PM10).Wherein can inhale
Enter particulate matter and can be subdivided into again fine particle (PM2.5) and corase particles.Atmospheric particulates are by scattering and inhale
Receive radiation and directly affect earth atmosphere radiation balance, by between the life-span of the optical characteristics and cloud that affect cloud
Connect and affect radiation balance of earth.Epidemiology and toxicologic research show, crowd's respiratory system and the heart
Vascular system disease sickness rate, number of hospitalized and crowd's mortality rate etc. all with Atmospheric Grains concentration
Change be correlated with.Additionally, Atmospheric particulates still cause China's central and east haze contamination accident frequently to occur
Main cause.Generally speaking, haze refers to the pollutant of various source emission (gas and particulate matter is such as
CO、SO2、NOx、NH3, VOCs (volatile organic matter), PM) at specific atmospheric flow field
Under the conditions of, through series of physical chemical process, form fine particle, and lead with steam interaction
The atmospheric extinction phenomenon caused.The essence of haze is PM in air2.5Concentration over-standard.Aerosol is to radiation
Scattering is one of important aerosol optical characteristics, and it is the master of atmospheric aerosol Radiative Forcing
Want part, be also the main cause causing ambient air visibility to reduce.Aerosol optical characteristics be by
Aerocolloidal mass concentration, chemical composition, particle size, shape and admixture determine.Therefore,
Pollute, with haze, the internal relation formed in order to further investigate aerosol, need aerocolloidal above-mentioned physics
Chemical property carry out online, continuous, monitor accurately.But, the above-mentioned character of aerosol all with air
Humidity relevant.Aerocolloidal scattering coefficient is had a great impact by air humidity, along with the increasing of humidity
Add, aerosol (especially fine particle) has hydrophilic chemical composition (as sulfate, nitrate and
Some Organic substances etc.) can moisture absorption grow up, thus increase the scattering power of particulate matter.
The influential effect result of aerosol optical characteristics is shown by above-mentioned humidity, to aerosol physics
The observation of chemical property such as mass concentration and chemical composition etc. and optical property thereof such as scattering coefficient etc. it
Before, need to reduce the air humidity of on-line instrument air inlet pipe, to obtain the above-mentioned property of Dry aerosol particle
Matter.At present, market is broadly divided into three classes for the air dried method of air inlet pipe.The first kind is right
Air inlet pipe carries out heated at constant temperature, if the most most particulate matter quality and concentration monitors are (such as U.S.'s thermoelectricity
The RP series instrument based on concussion sedimentation balance method of environmental instrument company and β ray method instrument) and granule
Thing scattering coefficient monitor (such as the three wave band transmissometers of Technical Sourcing Internation of the U.S.) all uses this type of method；
Equations of The Second Kind uses the drying tube being filled with desiccant, if particulate matter chemical composition monitor is (such as the U.S.
The flight time mass spectrum of Aerodyne company) and particulate count concentration particle diameter spectrometer (such as U.S. TSI
The scanning electromobility particle diameter spectrometer of company) all use this type of method；3rd class method uses unidirectional
Permeable membrane (such as Nafion membrane) makes the moisture of air inlet pipe be reduced air inlet pipe by pipe internal diffusion to managing outer
Humidity, the filter membrane kinetic measurement applied on RP series instrument such as thermoelectricity environmental instrument company of the U.S.
System (FDMS).Fig. 1 shows the workflow diagram of filter membrane dynamic measurement system.Solid arrow shows
The flow direction of sample gas, and the flow direction of dotted arrow display dry air, dry air and sample
Gas flow direction in drying tube is contrary, by the exchange of Nafion membrane, dry air in drying tube
Steam in sample gas is taken away, thus reduces the relative humidity in sample gas.
Additionally, domestic researcher was the most once devoted to the dehumidifying research that aerosol sample gathers.Beijing is big
Zeng Limin and Liu Qiaoling learned arranges condensing tube outside sample gas transfer tube, makees condensing agent with water,
Make to glide after in gas, part steam condenses on tube wall at 5-15 DEG C, outer row.China Meteorological
The office graduate Yan Peng of Meteorological Science etc. use steam add combine the method for computer heating control regulate into
The humidity of sample gas stream, the characteristic passed through based on steam osmos tube selectivity, control to ooze by regulation water temperature
Sample introduction airflow humidity in pipe thoroughly.
But there is following defect in the dehumidification mode of the sample collecting of prior art:
(1) heated at constant temperature process is only so that temperature raises, and correspondingly reduces the wettest of air
Degree, does not remove the excess water of sample gas.Meanwhile, also make a part of half volatile material (as
Semi-volatile organic matter and nitrate etc.) due to the rising of temperature and volatilization loss, for containing highly concentrated
The measurement of the particulate matter spending these components is more inaccurate；
(2) although the method for drying tube can effectively remove the moisture in sample gas, but air is run into
The weather that humidity is bigger, desiccant absorbs fast deactivation after excessive moisture, needs frequently to change to be dried
Desiccant in pipe, to keep dehumidification rate, not only needs to spend substantial amounts of manpower and materials, the most also shadow
Ring the online observation of instrument；
(3) method that sample gas moisture efficiency is the highest is removed during unidirectional osmosis film method is three class methods,
But running into pollution weather, the Atmospheric particulates of high concentration are easily in permeable membrane surface attachment, thus drop
The dehumidification rate of hypotonic permeable membrane even results in its inactivation；
(4) for the method arranging condensing tube outside sample gas transfer tube, the method is on the one hand
Cannot process the excess moisture in less than 5 DEG C air, air themperature condenses in the case of 5-15 DEG C
Effect on moisture extraction owes ideal.Meanwhile, the method due on air tube wall with the presence of condensation the globule, moisture film,
These globules, moisture film can capture air particle, and the water of the outer row of condensation can take away these captured
Grain thing, so that monitoring result is on the low side.
Summary of the invention
(1) to solve the technical problem that
For the defect in prior art described above, in order to reduce air humidity to Atmospheric particulates thing
Physicochemical and the interference of optical property on-line monitoring result, the invention provides a kind of aerosol collection
The adjusting means of sample introduction airflow humidity and method, and comprise the Atmospheric particulates measurement of this adjusting means
Instrument.
(2) technical scheme
According to an aspect of the present invention, it is provided that a kind of aerosol gathers the humidity regulation dress of sample introduction air-flow
Put, including:
Drying unit, it includes that at least two drying tube, each drying tube all include: inner tube, is used for
Pass through for sample introduction air-flow, unidirectional steam film, be covered in outer wall of inner tube, for the steam in sample introduction air-flow
Pass through, outer tube, be positioned at said inner tube and the outside of one-way ventilating film, and be formed between inner tube
Between, it is filled with desiccant in described space；Control system, for losing when a certain drying tube internal desiccant
When living, control described sample introduction air-flow and be passed through other at least one drying tube.
Preferably, humidity control apparatus also includes activating heater, for the desiccant to described inactivation
Heat.
Preferably, described activation heater includes silicone rubber heating plate, heat-insulation layer and insulating tube, silicon rubber
Glue heating plate cover on the outer wall of described outer tube, silicone rubber heating plate outwards set gradually heat-insulation layer and
Insulating tube.
Preferably, humidity control apparatus also includes dry air generator and air pressure pump, itself and institute
State space connection, for providing dry air to described space.
Preferably, described dry air generator and air pressure pump include dry air generator and sky
Gas compressor pump, described dry air generator is used for producing dry air, by described air pressure pump
Dry air is pumped in described space.
Preferably, described control system is additionally operable to monitor the temperature of described drying tube inlet and outlet, wet
Degree, and judge whether desiccant inactivates according to the import of monitoring with the psychrometric difference of outlet, control described work
Change the desiccant that heater is heated and inactivated.
Preferably, described control system is additionally operable to after desiccant inactivates control the generation of described dry air
Device and air pressure pump continue to be passed through dry air, accelerate desiccant activation.
Preferably, described unidirectional steam film pore size is 0.3-1.6 micron, said inner tube outer wall aperture
More than described unidirectional steam film aperture, further preferred described unidirectional steam film is poly tetrafluoroethylene.
According to a further aspect in the invention, more than one any one described humidity control apparatus is also provided for
Control method, it is characterised in that include step:
S1: sample introduction air-flow is passed through one of them drying tube of drying unit；
S2: the steam in sample introduction air-flow through cover one-way ventilating film on inner pipe enter said inner tube with
Space between outer tube, is absorbed by described desiccant；
S3: after drying tube internal desiccant absorbs steam extremely inactivation, control system controls described sample introduction gas
Circulate into other drying tube.
According to a further aspect in the invention, also providing for a kind of measuring instrument for atmospheric particulate matter device, its feature exists
In including that a kind of described aerosol of any of the above gathers the humidity control apparatus of sample introduction air-flow.
(3) beneficial effect
By technique scheme, the beneficial effects of the present invention is:
(1) present configuration is simple, installs, operates, easy maintenance, can be directly connected to big
On aerated particle thing on-line monitoring instrument (after being placed in gas sampling cutting head), it is adaptable to particulate matter thing
Physicochemical and optical property measurement instrument, such as particulate matter mass concentration on-line computing model, particulate count
Concentration spectrometer and particulate matter optical instrument such as transmissometer etc..Apparatus of the present invention intelligence degree is high, energy
Enough in real time the humidity of aerosol sample introduction air-flow is monitored, thus ensure dehumidification and temperature adjustment device long-term,
Stable, Effec-tive Function；
(2) relative to only reducing relative humidity by heating process, and water in sample gas is not changed
The actual content of vapour, the present invention, by arranging water vapor permeable membrane, utilizes the principle of vapour pressure difference to remove
The steam of excess, thus avoid because heating the loss of volatile material in the particulate matter caused, it is ensured that
Follow-up accurate, reliable to particulate matter physical chemistry and optical property measurement result；
(3) relative to the shortcoming of desiccant easy in inactivation in drying tube, the present invention uses politef
Film and desiccant combination, arrange two groups of drying tubes simultaneously, be respectively used to dehumidifying and mobilizing function；
(4) present invention can be according to the duty of change two groups of drying tubes of automatic switchover of atmospheric humidity；
And by using poly tetrafluoroethylene, the strong (vapor transfer rate >=10000g/m of its saturating vapour ability2, 24h),
But price is cheap far beyond Nafion membrane, and is easily installed；
(5) by arranging activation procedure, dry air is utilized to purge, it is to avoid to pollute air under weather
Particulate matter is attached to permeable membrane for a long time and causes it to inactivate, it is ensured that particle monitoring instrument is at high humidity ring
Continuous work under border.
Accompanying drawing explanation
Fig. 1 is filter membrane dynamic measurement system (FDMS) schematic diagram of prior art.
Fig. 2 is that the aerosol of the present invention one specific embodiment gathers sample introduction airflow humidity self-checking device
The block diagram of system.
Fig. 3 is the drying unit composition frame chart of the present invention one specific embodiment.
Fig. 4 is the dry air generator of the present invention one specific embodiment and air pressure pump and activation
Heater composition frame chart.
Fig. 5 is the control system composition frame chart of the present invention one specific embodiment.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with concrete real
Execute example, and referring to the drawings, the present invention is described in further detail.In the description, identical or
Similar drawing reference numeral indicates same or analogous parts.Following referring to the drawings to embodiment of the present invention
Explanation be intended to the present general inventive concept of the present invention is explained, and be not construed as the present invention
A kind of restriction.
According to present invention inventive concept generally, it is provided that a kind of aerosol gathers the humidity of sample introduction air-flow
Adjusting means, including: drying unit, use permeable membrane and desiccant associating dehumidification mode, and control
System processed, for when a certain drying tube internal desiccant inactivates, controls described sample introduction air-flow and is passed through other
At least one drying tube.
Preferably, device can also include activate heater, inactivate in heat-activated drying tube
Desiccant.
Preferably, device can also include dry air generator and air pressure pump, be used for providing
Dry air, provides pressure differential for steam infiltration, and accelerates the desiccant activation of inactivation.
Hereinafter each unit will be described in detail:
According to the present invention one specific embodiment, it is provided that a kind of aerosol gathers the regulation of sample introduction airflow humidity
Device, the composition structure chart of this adjusting means is as shown in Figure 2.Including dry air generator and air
Compressor pump 1, activation heater 2, drying unit 3 and control system 4.
Shown in Figure 3, drying unit 3 can include organizing drying tube more, and the present embodiment is done by two groups
Dry pipe A and B forms.Often group drying tube comprises the steps that constant speed reducer pipe 5, inner tube 6, outer tube 7,
Desiccant (the present embodiment specifically uses silica gel 8) and unidirectional steam film are (for through steam and impermeable
The material of Atmospheric particulates, the present embodiment preferably uses poly tetrafluoroethylene 9).
Drying tube outer tube 7 can be the material of any favorable sealing property, and embodiment uses lucite
Pipe, the two ends up and down of lucite tube are respectively arranged with external screw thread；The top of lucite tube, bottom
Being respectively arranged with top cover labyrinth and lower sealing cover, top cover labyrinth, the inner side of lower sealing cover are provided with interior spiral shell
Stricture of vagina；Between inner and outer pipes, top, bottom are all used the fastening of plastics O, are sealed；Described upper and lower sealing
Cover and described inner and outer pipe and O are sealed, and be fixed as one；Lucite tube side is in bottom
Plastic seal ring be arranged above with a sample gas air inlet pipe and a dry gas escape pipe, its opposite side
A sample gas escape pipe and dry gas air inlet pipe are provided below at top plastic sealing ring.
Drying tube inner tube 6 is the cylindrical material that percent opening is big, and preferred percent opening is more than politef
Film, the present embodiment is rustless steel cylindrical body supports pipe, and its outer wall covers unidirectional steam film, and its aperture is
0.3-1.6 micron, the highest steam permeability aperture is the teflon membrane filter 9 of 0.45 micron, and inner tube is straight
Footpath is 4 times of sampling tube diameter, thus increases the sample gas time of staying in dry inner tube.Inner tube 6
It is connected by constant speed reducer pipe 5 with sampling air inlet pipe and sample gas escape pipe.
When sample air is by inner tube 6, poor owing to there is vapour pressure inside and outside inner tube 6, sample is empty
Steam in gas by poly tetrafluoroethylene be diffused into outer tube 7 and be filled in inner tube 6 and outer tube 7 it
Between desiccant, the present embodiment is preferably silica gel 8 and adsorbs, this process persistently carry out thus reach fall
The purpose of low sample air humidity.Above-mentioned drying tube arranges 2 groups, when one group of drying tube inactivation, and gas
Road switches to another set drying tube and takes turns to operate.
Shown in Figure 4, activation heater 2 includes by silicone rubber heating plate 10, heat-insulation layer 11 and
Insulating tube 12 (this enforcement concrete for lucite tube).Silicone rubber heating plate covers outside drying tube
Pipe 7 outer wall, diameter is enclosed within drying tube outer tube 7, at insulating tube more than the insulating tube 12 of drying tube
12 are cased with heat-insulation layer 11, preferably thermal insulation foam material in the gap of drying tube outer tube 7 again
Material, the temperature that during to keep heater to work, drying tube is overall, at about 80 DEG C, absorbs water at this temperature
Silica gel in moisture slowly separate out, thus reach the purpose of activated silica gel.Above-mentioned dry air generator
It is fixed in casing outside drying unit, for covering the rustless steel hollow circuit cylinder of silicone rubber heating plate 10
Body 14, this rustless steel hollow circular cylinder 14 top connects air pressure pump 13 by gas piping and inputs
Compressed air, compressed air stays for some time (1 hour) at rustless steel hollow circular cylinder, to produce
Temperature is at the dry air of about 80 DEG C.Gas tube is passed through bottom above-mentioned rustless steel hollow circular cylinder 14
Road is connected with the dry air air inlet pipe of drying tube.The silica gel assisting variable color saturated to moisture absorption is carried out
Activation restorability.
Shown in Figure 5, control system 4 includes industrial computer 15, thermocouple input module 16, continues
Electrical equipment output module 17 and relay 18.Control system is used for monitoring described drying tube inlet and outlet
Temperature, humidity, and judge whether desiccant inactivates according to the psychrometric difference of import and the outlet of monitoring,
Control the desiccant that described activation heater is heated and inactivated.Judge whether desiccant inactivates can pass through directly
Connect observation, or detected by instrument, such as detect the psychrometric difference etc. of drying tube inlet and outlet,
Connect and judge whether desiccant can also be continuing with；Control system is additionally operable to after desiccant inactivates control institute
State dry air generator and air pressure pump continues to be passed through dry air, accelerate desiccant activation.
Relay output module ADAM4068 has No. 8 relay passages, respectively with 4 electric balls
Shape straight-through valve TA1-2 and TB1-2,2 electromagnetism two-way stop valve FA and FB, 1 threeway electromagnetism
Valve F3 and 1 relay 18 are connected.4 electronic spherical straight-through valves be separately mounted to drying tube with etc.
The junction of speed diverter.2 electromagnetism two-port valve FA and FB are arranged on drying tube top dry air
Gas outlet, 1 three-way valve F3 controls dry gas stream and enters drying tube A and B.Heat drying gas
Supply by relay 18 Time-sharing control dry air generator, the switch of its gas circuit is by 2 electromagnetism
Two-port valve F4 and F5 completes to control.
Control method based on above-mentioned drying system device, comprises the following steps:
Thermocouple input module ADAM4018 is connected with the Temperature Humidity Sensor 19 of air inlet and gas outlet,
And by RS232 digital serial port wiring, humiture information is fed back to industrial computer, the built-in industry control of industrial computer
Configuration software MCGS, MCGS program is dried sky according to the humiture data of sample air inlet, regulation
If the work efficiency ambient humidity of gas generator is too high, then improve heating-up temperature and the sky being dried gas
The compressed-air actuated flow of air pressure contracting pump, the main control parameters being dried hot-air heater is electric current, industrial computer
The temperature in the dry hot-air heater exit by collecting controls to be dried the electric current of hot-air heater, will
Dry gas is heated to suitable temperature (such as 80 DEG C), is dried the relative humidity of gas with further reduction.
Meanwhile, MCGS program by the humiture data of the sample gas outlet collected and sets
Humidity threshold (if relative humidity is 40%) contrast, it is determined that the performance level of drying tube, will life
Make action feed back to relay output module by thermocouple input module, and then control opening of electromagnetic valve
Close Guan Bi, in order to be dried work and the mobilizing function switching of pipe A and B.
When drying tube A is in observer state, TA1, TA2 open, and FA closes, and observe air-flow
Measuring instrument is entered through drying tube A.TB1 simultaneously, TB2 are closed, and three-way valve does not adds
Electricity 1-3 leads to, and FB powers up and opens, and drying tube B is in silica gel activating and recovers state, on silicane rubber plate
Electricity, drying tube B is heated, and heating and temperature control is with regulating the voltage of heating tape to heating-up temperature 80 DEG C
Left and right, checks with temperature probe and temperature indicator.Meanwhile, the dry sky that dry air generator produces
Air-blowing is inswept, and B pipe is interior, accelerates the activation of silica gel.
When the humidity of drying tube A gas outlet is more than the humidity threshold set, TA1, TA2 close,
FA opens, and F3 powers up, and drying tube A is heated, the dry air that dry air generator produces simultaneously
In purged A pipe, drying tube A is in silica gel activating and recovers state, and drying tube B is in work
State.
Additionally, the above-mentioned definition to each element and method is not limited in the various tools mentioned in embodiment
Body structure, shape or mode, it can be changed or replace by those of ordinary skill in the art simply,
Such as:
(1) industrial computer in control system can also be by the form of single-chip microcomputer；
(2) poly tetrafluoroethylene for water-vapor exchange can replace with Nafion membrane；
Particular embodiments described above, is carried out the purpose of the present invention, technical scheme and beneficial effect
Further describe it should be understood that the foregoing is only the specific embodiment of the present invention,
Be not limited to the present invention, all within the spirit and principles in the present invention, any amendment of being made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. the humidity control apparatus of an aerosol collection sample introduction air-flow, it is characterised in that including:
Drying unit (3), it includes that at least two drying tube, each drying tube all include:
Inner tube, for passing through for sample introduction air-flow,
Unidirectional steam film, is covered in outer wall of inner tube, passes through for the steam in sample introduction air-flow,
Outer tube, is positioned at said inner tube and the outside of one-way ventilating film, and is formed with one between inner tube
Space, is filled with desiccant in described space；
Control system (4), for when a certain drying tube internal desiccant inactivates, controls described sample introduction gas
Circulate into other at least one drying tube.
Aerosol the most according to claim 1 gathers the humidity control apparatus of sample introduction air-flow, its
It is characterised by also including activating heater (2), for the desiccant of described inactivation is heated.
Aerosol the most according to claim 2 gathers the humidity control apparatus of sample introduction air-flow, its
Being characterised by, described activation heater (2) includes silicone rubber heating plate, heat-insulation layer and insulating tube,
Silicone rubber heating plate covers on the outer wall of described outer tube, and silicone rubber heating plate outwards sets gradually insulation
Layer and insulating tube.
Aerosol the most according to claim 1 gathers the humidity control apparatus of sample introduction air-flow, its
Being characterised by also including dry air generator and air pressure pump (1), it connects with described space,
For providing dry air to described space.
Aerosol the most according to claim 4 gathers the humidity control apparatus of sample introduction air-flow, its
Being characterised by, described dry air generator and air pressure pump (1) include dry air generator
And air pressure pump, described dry air generator is used for producing dry air, by described air pressure
Dry air is pumped in described space by contracting pump.
Aerosol the most according to claim 2 gathers the humidity control apparatus of sample introduction air-flow, its
Being characterised by, described control system is additionally operable to monitor the temperature of described drying tube inlet and outlet, humidity,
And judge whether desiccant inactivates according to the import of monitoring with the psychrometric difference of outlet, control described activation and add
The desiccant that hot device is heated and inactivated.
Aerosol the most according to claim 4 gathers the humidity control apparatus of sample introduction air-flow, its
Being characterised by, described control system is additionally operable to after desiccant inactivates control described dry air generator
Continue to be passed through dry air with air pressure pump, accelerate desiccant activation.
Aerosol the most according to claim 1 gathers the humidity control apparatus of sample introduction air-flow, its
Being characterised by, described unidirectional steam film pore size is 0.3-1.6 micron, and said inner tube outer wall aperture is big
In described unidirectional steam film aperture, preferred described unidirectional steam film is poly tetrafluoroethylene.
9. use a control method for humidity control apparatus described in claim 1-8 any one, its
It is characterised by including step:
S1: sample introduction air-flow is passed through one of them drying tube of drying unit；
S2: the steam in sample introduction air-flow through cover one-way ventilating film on inner pipe enter said inner tube with
Space between outer tube, is absorbed by described desiccant；
S3: after drying tube internal desiccant absorbs steam extremely inactivation, control system controls described sample introduction gas
Circulate into other drying tube.
10. a measuring instrument for atmospheric particulate matter device, it is characterised in that include that claim 1-8 is any one
Aerosol described in Xiang gathers the humidity control apparatus of sample introduction air-flow.
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| CN108267388A (en) * | 2018-02-02 | 2018-07-10 | 中国气象局广州热带海洋气象研究所 | A kind of Aerosol scattering coefficient moisture absorption increases measuring instrument and measuring method |
| CN109557009A (en) * | 2019-01-22 | 2019-04-02 | 深圳市无眼界科技有限公司 | A kind of wide range particulate matter detection means |
| CN110631970A (en) * | 2019-09-16 | 2019-12-31 | 合肥福瞳光电科技有限公司 | Dynamic heating system and atmosphere ultrafine particle detector |
| CN111744336A (en) * | 2020-07-06 | 2020-10-09 | 艾感科技(广东)有限公司 | Reusable air inlet drying and filtering system |
| CN111760424A (en) * | 2020-07-06 | 2020-10-13 | 艾感科技(广东)有限公司 | A dry filtration system admits air for miniature air monitoring station |
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| CN113465831A (en) * | 2021-06-28 | 2021-10-01 | 广州检验检测认证集团有限公司 | Leakage rate testing device for multifunctional three-dimensional respirator |
| CN114383918A (en) * | 2022-01-11 | 2022-04-22 | 长安大学 | ENM aerosol diffusion drying system |
| CN114594805A (en) * | 2022-01-26 | 2022-06-07 | 青岛明华电子仪器有限公司 | Flue gas humidity control method based on Nafion pipe |
| CN117705662A (en) * | 2024-02-02 | 2024-03-15 | 北京英视睿达科技股份有限公司 | Method for calculating mass concentration of humidity-compensated particulate matter monitoring equipment |
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