CN105928846A - Measuring system and measuring method of aerosol scattering and moisture absorbing growth factors - Google Patents
Measuring system and measuring method of aerosol scattering and moisture absorbing growth factors Download PDFInfo
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Abstract
The invention discloses a measuring system and measuring method of aerosol scattering and moisture absorbing growth factors. The measuring system comprises a drying pipe, a first nephelometer, a second nephelometer, a humidification pipe, a first three-way valve, a second three-way valve, a first two-way valve, a second two-way valve, a first water bath, a second water bath and a computer. According to the measuring system, an outer-layer casing pipe and an inner-layer semipermeable membrane pipe are adopted to form the humidification pipe, water in the humidification pipe and the water baths form a closed cycle, the water temperature is controlled by the water baths, and the highest relative humidity of a humidified aerosol sample can reach 95%; the two water baths are adopted to participate in humidification efficiency controlling, when the system runs, the working modes of the two water baths are staggered and are the heating mode and the refrigerating mode respectively, and therefore the time resolution can be increased by one time; in addition, in the whole circle period, the system is always in a relative humidity increasing period, and therefore effective data outputting is guaranteed.
Description
Technical field
The invention belongs to aerosol detection field, be specifically related to measurement system and the measuring method thereof of a kind of aerosol scattering moisture absorption growth factor.
Background technology
Atmospheric aerosol can directly scatter and absorb solar radiation, additionally it is possible to affect indirectly ground vapour system radiation balance by participating in cloud physics process.Up-to-date IPCC report shows, with compared with other Atmospheric components including greenhouse gases, Aerosol radiation forces the uncertainty of result to be still that maximum.The direct radiation effect of accurate evaluation aerosol is it should be understood that Optical Properties of Aerosol and spatial and temporal distributions thereof.Aerosol properties observation is generally carried out in dry conditions.When envionmental humidity is higher, particulate absorbs steam, and particle diameter increases, and complex refractivity index changes, its scattering absorption characteristic and significant difference under drying regime.Force in assessment in order to the observed result obtained in dry conditions is applied to Aerosol radiation, it is to be understood that aerosol optical characteristics is with the change of relative humidity.Satellite data inverting and ground observation data and remotely-sensed data comparative study also need to understand aerocolloidal optics moisture-absorption characteristics.
Previous research uses aerosol scattering moisture absorption growth factor (Light scattering enhancement factor, f (RH)) quantitative description Aerosol scattering coefficient with the variation relation of relative humidity, be defined as the Aerosol scattering coefficient σ after moisture absorption increases under target relative humiditysp(RH) with Aerosol scattering coefficient σ under drying regimesp,dryRatio:
F (RH)=σsp(RH)/σsp,dry。 (1)
Humidification nephelometer system can be used for the measurement of aerosol scattering moisture absorption growth factor.The set humidification nephelometer system that beats the world is equal to design for 1972 by Covert, including humidifying unit and nephelometer two parts: dry aerosol sample gas is first passed through mixing chamber, it is mixed to get the aerosol after humidification with moist pure air, it is passed through nephelometer again, measures the Aerosol scattering coefficient after humidification.Humidification nephelometer system used in research follows the design of Covert et al. afterwards, updates humidifying unit simultaneously, promotes humidification efficiency and certainty of measurement.
Recent two decades, aerosol scattering moisture-absorption characteristics observation the most extensively carry out, object of observation relates to polytype aerosol.The scattering wettability power of marine aerosol is the strongest, record all over the world marine aerosol scattering moisture absorption growth factor f (RH=80%) under 80% relative humidities 2.2 to 2.7 between.Continent type aerosol and aerosols from major cities are mainly by local discharge, and scattering moisture-absorption characteristics differs greatly, and f (RH=80%) measured value is between 1.4 to 2.0.Aerosol and Sand Dust Aerosol hygroscopicity that biomass combustion generates are the most weak, and f (RH=80%) measured value is less than 1.3.Domestic dependent observation research starting is very late.The M9003 type integrating nephelometer that Yan Peng etc. use Liang Tai EchoTech company to produce built a set of humidification nephelometer system, the relative humidity control program of its humidifying unit design reference U.S.National Oceanic air office.This is the current domestic humidification nephelometer system uniquely can found from document.This system has been used for the environmental aerosols observation of Beijing-Tianjin area, the average result of aerosol scattering moisture absorption rising characteristic during being observed.
Area, the North China Plain is one of the most serious area of whole world Aerosol Pollution, and aerosol physicochemical characteristics is complicated, and shows significant Diurnal Variation.HHTDMA (High Humidity Tandem Differential Mobility Analyzer) observed result shows, during daytime, non-hygroscopic particle only accounts for the 8% of total population, and during night, non-hygroscopic particle ratio increases to 20%.The activation rate observation of aerosol gradation footpath also confirms that North China's aerosol hygroscopicity diurnal variation shows.As a example by result under the conditions of 0.20% supersaturation ratio: during daytime, average activation rate is close to 0.28, and during night only be about 0.25, early 7 and evening 7 time activation rate low value occurs.Kuang Y. etc., based on measured data, utilize radiative transmission mode assessment North China Plain Aerosol direct radiative forcing[22].Analog result shows, can significantly improve the precision of assessment result compared to using aerosol optical parameter average result as input parameter, input optical parametric diurnal variation data.Domestic existing humidification nephelometer systemic resolution is relatively low, is not enough to catch the Diurnal Variation of aerosol scattering moisture absorption rising characteristic.Therefore, a set of high time resolution humidification nephelometer system for the observation of aerosol scattering moisture absorption growth factor is developed the most necessary.
Summary of the invention
For above problems of the prior art, the present invention proposes measurement system and the measuring method thereof of a kind of aerosol scattering moisture absorption growth factor, it is possible to increase the temporal resolution during observation, can improve the relative humidity during humidification simultaneously.
It is an object of the present invention to propose the measurement system of a kind of aerosol scattering moisture absorption growth factor.
The measurement system of the aerosol scattering moisture absorption growth factor of the present invention includes: drying tube, the first nephelometer, the second nephelometer, humidifier tube, the first triple valve, the second triple valve, the first two-port valve, the second two-port valve, the first water-bath, the second water-bath and computer；Wherein, the gas outlet of drying tube is respectively connecting to the first turbidimetric air inlet and the air inlet of humidifier tube；The gas outlet of humidifier tube is connected to the second turbidimetric air inlet；The first of the first triple valve connects the delivery port of humidifier tube, second mouthful of water inlet connecting the first water-bath, the 3rd mouthful of water inlet connecting the second water-bath；The first of the second triple valve connects the water inlet of humidifier tube, second mouthful of delivery port connecting the first water-bath, the 3rd mouthful of delivery port connecting the second water-bath；First two-port valve connects water inlet and the delivery port of the first water-bath respectively；Second two-port valve connects water inlet and the delivery port of the second water-bath respectively；First water-bath and the second water-bath are respectively connecting to computer；Aerosol sample gas enters drying tube, and dried aerosol sample gas is divided into two-way, and a road enters the first nephelometer, measures the Aerosol scattering coefficient under drying regime；Another road first passes through humidifier tube, enters back into the second nephelometer, measures the Aerosol scattering coefficient after humidification；When first water-bath is in heating mode, second water-bath is in refrigeration mode, first water-bath connects with humidifier tube and interior circulation is done in the second water-bath, water in first water-bath flows out from the delivery port of the first water-bath, enters the water inlet of humidifier tube through the second triple valve, flows out from the delivery port of humidifier tube, the water inlet of the first water-bath is entered through the first triple valve, returning the first water-bath, the water in the second water-bath flows into the water inlet of the second water-bath from the outlet of the second water-bath through the second two-port valve, returns the second water-bath；When second water-bath is in heating mode, first water-bath is in refrigeration mode, second water-bath connects with humidifier tube and circulation in the first water-bath, water in second water-bath flows out from the delivery port of the second water-bath, enters the water inlet of humidifier tube through the second triple valve, flows out from the delivery port of humidifier tube, the water inlet of the second water-bath is entered through the first triple valve, returning the second water-bath, the water in the first water-bath flows into the water inlet of the first water-bath from the outlet of the first water-bath through the first two-port valve, returns the first water-bath.
Humidifier tube includes the sleeve pipe of outer layer and the semi-transparent membrane tube of internal layer, and the two is coaxial；The surface of the semi-transparent membrane tube of internal layer is uniformly covered with aperture, and aperture is more than the yardstick of hydrone, simultaneously less than the yardstick of molecular cluster；The two ends of the semi-transparent membrane tube of internal layer are respectively provided with air inlet and gas outlet, form gas passage in semi-transparent membrane tube；It is respectively provided with delivery port and water inlet on the tube wall of the sleeve pipe of outer layer, between sleeve pipe and the semi-transparent membrane tube of internal layer of outer layer, forms aquaporin；The flow direction of aerosol sample gas is contrary with the flow direction of water.Sleeve pipe uses stainless steel；Semi-transparent membrane tube uses GORE-TEX Gore-Tex material.Aerosol sample gas is passed through in semi-transparent membrane tube, and aqueous water passes through between semi-transparent membrane tube and stainless steel tube, and hydrone can humidify sample gas in penetrating into semi-transparent membrane tube by aperture, and drop is stopped by semi-transparent membrane tube.The osmotic efficiency of hydrone is relevant to water temperature, and water temperature raises, and hydrone osmotic efficiency increases, and humidification efficiency promotes.Water in humidifier tube constitutes closed circulation with water-bath, and water temperature is by water-bath control.Through calibrating, the aerosol sample gas relative humidity after humidification can reach 95%.
The present invention uses two water-baths to participate in humidification efficiency control, and when system is run, the mode of operation of two water-baths staggers: when the first water-bath is in heating mode, the second water-bath is in refrigeration mode；And when the first water-bath is in refrigeration mode, the second water-bath is in heating mode.When first water-bath is in heating mode, constituting loop with humidifier tube, in controlling humidifier tube, water temperature gradually rises, and humidification efficiency promotes, and after humidification, the relative humidity of aerosol sample gas rises；Now the second water-bath is in refrigeration mode, and does interior circulation, and in water-bath, water temperature reduces.When aerosol sample gas is humidified to threshold value relative humidity, the first water-bath switches to refrigeration mode, and the second water-bath switches to heating mode, can change water circulation pipe by means of valve simultaneously, and the second water-bath connects with humidifier tube and interior circulation is done in the first water-bath；Owing in the second water-bath, water temperature is reduced to the lowest, humidifier tube humidification efficiency declines rapidly, and after humidification, the relative humidity of aerosol sample gas declines rapidly, the most slowly rises along with the second heating water bath afterwards.Compared to single water-bath humidification nephelometer system, the present invention uses two water-baths to be respectively at heating mode and refrigeration mode, water-bath is connected to computer, the pattern of water-bath is controlled by computer, temporal resolution can be doubled, and in whole cycle period, system is in the relative humidity ascent stage all the time, it is ensured that valid data export.
When first water-bath is in heating mode, the second water-bath is in refrigeration mode, and the first two-port valve turns off, the second two-port valve connection, the first of the first triple valve and second mouthful of connection, the 3rd mouthful of shutoff, the first of the second triple valve and second mouthful of connection, the 3rd mouthful of shutoff；When second water-bath is in heating mode, the first water-bath is in refrigeration mode, the first two-port valve connection, the second two-port valve connection, the first of the first triple valve and the 3rd mouthful of connection, second mouthful of shutoff, the first of the second triple valve and the 3rd mouthful of connection, second mouthful of shutoff.
Aerosol scattering moisture absorption growth factor f (RH) increases along with relative humidity rising about the sensitivity of relative humidity.When relative humidity is close to 100%, the minor variations of relative humidity may result in the great variety of f (RH).Therefore, the relative humidity in nephelometer cavity is accurately measured most important for the uncertainty reducing f (RH) result.The present invention finds that in building humidification nephelometer systematic procedure the moisture probe measured value that nephelometer carries is forbidden, and needs to correct.When sample gas after humidification passes through the diverse location of system, due to temperature change, relative humidity can follow change, because the steam conservation in nephelometer, so dew-point temperature is constant.Accordingly it is contemplated that the dew-point temperature of sample gas is measured in other positions in pipeline, indirectly calculate the relative humidity in the second nephelometer cavity.Part researcher connects a dew point hygrometer after nephelometer, and the present invention respectively arranges one piece of warm and humid probe at the second turbidimetric air inlet and gas outlet.When system is run, two pieces of warm and humid probes respectively record one group of temperature value and rh value, can calculate dew-point temperature DP1 at air inlet and at gas outlet and DP2.If system normal operation, DP1 and DP2 should be equal.Relative humidity in cavity after utilizing the temperature measured value in DP1 and DP2 and the second nephelometer cavity to be corrected.
Further object is that the measuring method that a kind of aerosol scattering moisture absorption growth factor is provided.
The measuring method of the aerosol scattering moisture absorption growth factor of the present invention, comprises the following steps:
1) opening the first and second water-baths and the first and second nephelometers, aerosol sample gas enters drying tube, and dried aerosol sample gas is divided into two-way, and a road enters the first nephelometer, measures the Aerosol scattering coefficient under drying regime；Another road first passes through humidifier tube, enters back into the second nephelometer, measures the Aerosol scattering coefficient after humidification；
2) the first water-bath is in heating mode, second water-bath is in refrigeration mode, first water-bath connects with humidifier tube and interior circulation is done in the second water-bath, water in first water-bath flows out from the delivery port of the first water-bath, the water inlet of humidifier tube is entered through the second triple valve, the flow direction of water is contrary with the flow direction of aerosol sample gas, water forms aquaporin between the sleeve pipe and the semi-transparent membrane tube of internal layer of outer layer and passes through, hydrone penetrates into humidifier colloidal sol sample gas in semi-transparent membrane tube by aperture, and by semi-transparent membrane tube, drop is stopped that the delivery port from humidifier tube flows out, the water inlet of the first water-bath is entered through the first triple valve, return the first water-bath, water in second water-bath flows into the water inlet of the second water-bath from the outlet of the second water-bath through the second two-port valve, return the second water-bath；
3) aerosol sample gas humidifies in humidifier tube, relative humidity is gradually increasing, when aerosol sample gas is humidified to after threshold value relative humidity, first water-bath switches to refrigeration mode, and the second water-bath switches to heating mode, change the state of the first and second two-port valves and the first and second triple valves to change water circulation pipe simultaneously, make that the second water-bath connects with humidifier tube and interior circulation is done in the first water-bath, the relative humidity of aerosol sample gas declines rapidly, the most slowly rises along with the second heating water bath afterwards；
4) the second water-bath is in heating mode, first water-bath is in refrigeration mode, water in second water-bath flows out from the delivery port of the second water-bath, the water inlet of humidifier tube is entered through the second triple valve, the flow direction of water is contrary with the flow direction of aerosol sample gas, water forms aquaporin between the sleeve pipe and the semi-transparent membrane tube of internal layer of outer layer and passes through, hydrone penetrates into humidifier colloidal sol sample gas in semi-transparent membrane tube by aperture, and by semi-transparent membrane tube, drop is stopped that the delivery port from humidifier tube flows out, the water inlet of the second water-bath is entered through the first triple valve, return the second water-bath, water in first water-bath flows into the water inlet of the first water-bath from the outlet of the first water-bath through the first two-port valve, return the first water-bath；
5) the most humidified to after threshold value relative humidity when aerosol sample gas, second water-bath switches to refrigeration mode, and the first water-bath switches to heating mode, change the state of the first and second two-port valves and the first and second triple valves to change water circulation pipe simultaneously, make that the first water-bath connects with humidifier tube and interior circulation is done in the second water-bath, the relative humidity of aerosol sample gas declines rapidly, the most slowly rises along with the first heating water bath afterwards；
6) step 2 is repeated)～5), until data acquisition is complete, successively turn off the first and second water-baths and the first and second nephelometers；
7) the Aerosol scattering coefficient σ under drying regime is obtained according to the first nephelometer measurementsp,dry, and the Aerosol scattering coefficient σ after the second nephelometer measurement humidificationsp(RH) aerosol scattering moisture absorption growth factor f (RH), is obtained:
F (RH)=σsp(RH)/σsp,dry。
Wherein, in step 7) in, utilize and be separately positioned on the temperature measured value in the second turbidimetric air inlet and two warm and humid probes of gas outlet and the second nephelometer cavity, derive the relative humidity in the second nephelometer cavity.
Advantages of the present invention:
The present invention uses the sleeve pipe of outer layer and the semi-transparent membrane tube of internal layer to constitute humidifier tube, and the water in humidifier tube constitutes closed circulation with water-bath, and water temperature be can reach 95% by water-bath control, the aerosol sample gas relative humidity after humidification；Use two water-baths to be respectively at heating mode and refrigeration mode, temporal resolution can be doubled, and in whole cycle period, system is in the relative humidity ascent stage all the time, it is ensured that valid data export.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the measurement system of the aerosol scattering moisture absorption growth factor of the present invention；
Fig. 2 is the schematic diagram of the humidifier tube of the measurement system of the aerosol scattering moisture absorption growth factor of the present invention；
Fig. 3 is the curve map of relative humidity cycle of aerosol sample gas after humidification during the measurement system of aerosol scattering moisture absorption growth factor is run.
Detailed description of the invention
Below in conjunction with the accompanying drawings, by specific embodiment, the present invention is expanded on further.
As it is shown in figure 1, the present embodiment drying tube the 1, first and second nephelometer 21 and 22, humidifier tube the 3, first and second triple valve 3V1 and 3V2, the first and second two-port valve 2V1 and 2V2, the first and second water-baths 41 and 42 and computer；Wherein, the gas outlet of drying tube 1 is respectively connecting to air inlet and the air inlet of humidifier tube 3 of the first nephelometer 21；The gas outlet of humidifier tube 3 is connected to the air inlet of the second nephelometer 22；1. the first of the first triple valve 3V1 connects the delivery port of humidifier tube 3, second mouthful of water inlet 2. connecting the first water-bath, the 3rd mouthful of water inlet 3. connecting the second water-bath 42；1. the first of the second triple valve connects the water inlet of humidifier tube, second mouthful of delivery port 2. connecting the first water-bath 41, the 3rd mouthful of delivery port 3. connecting the second water-bath 42；First two-port valve 2V1 connects water inlet and the delivery port of the first water-bath 41 respectively；Second two-port valve 2V2 connects water inlet and the delivery port of the second water-bath 42 respectively；First water-bath 41 and the second water-bath 42 are respectively connecting to computer.One piece of warm and humid probe 5 is respectively set at the air inlet and gas outlet of the second nephelometer 22.
In the present embodiment, the first and second two-port valves use two-way electromagnetic valve, and are respectively connecting to computer；First and second triple valves use three-way magnetic valve, and are respectively connecting to computer, control magnetic valve by computer.The first of three-way magnetic valve is respectively common port, normally open and normally closed port to the 3rd mouthful.
As in figure 2 it is shown, humidifier tube 3 includes the sleeve pipe 31 of outer layer and the semi-transparent membrane tube 32 of internal layer；The two ends of the semi-transparent membrane tube of internal layer are respectively provided with air inlet 33 and gas outlet 34, and semi-transparent membrane tube is internally formed gas passage；It is respectively provided with delivery port 35 and water inlet 36 on the tube wall of the sleeve pipe of outer layer, between sleeve pipe and the semi-transparent membrane tube of internal layer of outer layer, forms aquaporin；The flow direction of aerosol sample gas is contrary with the flow direction of water.Sleeve pipe uses stainless steel；Semi-transparent membrane tube uses GORE-TEX Gore-Tex material.
The measuring method of the aerosol scattering moisture absorption growth factor of the present embodiment, comprises the following steps:
1) opening the first and second water-baths and the first and second nephelometers, aerosol sample gas enters drying tube, and dried aerosol sample gas is divided into two-way, and a road enters the first nephelometer, measures the Aerosol scattering coefficient under drying regime；Another road first passes through humidifier tube, enters back into the second nephelometer, measures the Aerosol scattering coefficient after humidification；
2) the first water-bath is in heating mode, second water-bath is in refrigeration mode, first water-bath connects with humidifier tube and interior circulation is done in the second water-bath, water in first water-bath flows out from the delivery port of the first water-bath, the water inlet of humidifier tube is entered through the second triple valve, water forms aquaporin between the sleeve pipe and the semi-transparent membrane tube of internal layer of outer layer and passes through, hydrone penetrates into humidifier colloidal sol sample gas in semi-transparent membrane tube by aperture, and by semi-transparent membrane tube, drop is stopped that the delivery port from humidifier tube flows out, the water inlet of the first water-bath is entered through the first triple valve, return the first water-bath, water in second water-bath flows into the water inlet of the second water-bath from the outlet of the second water-bath through the second two-port valve, return the second water-bath；
3) after humidification, the relative humidity of aerosol sample gas rises to about 95% from 40%, when aerosol sample gas is humidified to after threshold value relative humidity 95%, first water-bath switches to refrigeration mode, and the second water-bath switches to heating mode, change the state of the first and second two-port valves and the first and second triple valves to change water circulation pipe simultaneously, make that the second water-bath connects with humidifier tube and interior circulation is done in the first water-bath, owing in the second water-bath, the temperature of water is reduced to the lowest, humidifier tube humidification efficiency declines rapidly, after humidification, the relative humidity of aerosol sample gas is directly fallen to 40% by 95%, the most slowly rise along with the second heating water bath afterwards；
4) the second water-bath is in heating mode, first water-bath is in refrigeration mode, water in second water-bath flows out from the delivery port of the second water-bath, the water inlet of humidifier tube is entered through the second triple valve, water forms aquaporin between the sleeve pipe and the semi-transparent membrane tube of internal layer of outer layer and passes through, hydrone penetrates into humidifier colloidal sol sample gas in semi-transparent membrane tube by aperture, and by semi-transparent membrane tube, drop is stopped that the delivery port from humidifier tube flows out, the water inlet of the second water-bath is entered through the first triple valve, return the second water-bath, water in first water-bath flows into the water inlet of the first water-bath from the outlet of the first water-bath through the first two-port valve, return the first water-bath；
5) after aerosol sample gas is the most humidified to 95%, second water-bath switches to refrigeration mode, and the first water-bath switches to heating mode, change the state of the first and second two-port valves and the first and second triple valves to change water circulation pipe simultaneously, make that the first water-bath connects with humidifier tube and interior circulation is done in the second water-bath, owing in the first water-bath, the temperature of water is reduced to the lowest, humidifier tube humidification efficiency declines rapidly, after humidification, the relative humidity of aerosol sample gas is directly fallen to 40% by 95%, the most slowly rises along with the first heating water bath afterwards；
6) step 2 is repeated)～5), until data acquisition is complete, successively turn off the first and second water-baths and the first and second nephelometers；
7) the Aerosol scattering coefficient σ under drying regime is obtained according to the first nephelometer measurementsp,dry, and the Aerosol scattering coefficient σ after the second nephelometer measurement humidificationsp(RH) aerosol scattering moisture absorption growth factor f (RH), is obtained:
F (RH)=σsp(RH)/σsp,dry。
As it is shown on figure 3, temporal resolution can be doubled by the system of the present invention, and in whole cycle period, system is in the relative humidity ascent stage all the time, it is ensured that valid data export.
It is finally noted that, the purpose publicizing and implementing example is that help is further appreciated by the present invention, but it will be appreciated by those skilled in the art that: without departing from the spirit and scope of the invention and the appended claims, and various substitutions and modifications are all possible.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention defines in the range of standard with claims.
Claims (9)
1. the measurement system of an aerosol scattering moisture absorption growth factor, it is characterised in that described measurement system includes: drying tube,
One nephelometer, the second nephelometer, humidifier tube, the first triple valve, the second triple valve, the first two-port valve, the second two-port valve,
First water-bath, the second water-bath and computer；Wherein, the gas outlet of described drying tube be respectively connecting to first turbidimetric enter
Gas port and the air inlet of humidifier tube；The gas outlet of described humidifier tube is connected to the second turbidimetric air inlet；Described first threeway
The first of valve connects the delivery port of humidifier tube, second mouthful of water inlet connecting the first water-bath, and the 3rd mouthful connects the second water-bath
Water inlet；The water inlet of the first connection humidifier tube of described second triple valve, second mouthful of delivery port connecting the first water-bath,
The 3rd mouthful of delivery port connecting the second water-bath；Described first two-port valve connects water inlet and the delivery port of the first water-bath respectively；Institute
State the second two-port valve and connect water inlet and the delivery port of the second water-bath respectively；Described first water-bath and the second water-bath are respectively connecting to
Computer；Aerosol sample gas enters drying tube, and dried aerosol sample gas is divided into two-way, and a road enters the first nephelometer,
Measure the Aerosol scattering coefficient under drying regime；Another road first passes through humidifier tube, enters back into the second nephelometer, measures humidification
After Aerosol scattering coefficient；When first water-bath is in heating mode, the second water-bath is in refrigeration mode, the first water-bath with add
Wet pipe connects and interior circulation is done in the second water-bath, and the water in the first water-bath flows out from the delivery port of the first water-bath, through the second triple valve
Enter the water inlet of humidifier tube, flow out from the delivery port of humidifier tube, enter the water inlet of the first water-bath through the first triple valve, return
Returning the first water-bath, the water in the second water-bath flows into the water inlet of the second water-bath, returns from the outlet of the second water-bath through the second two-port valve
Return the second water-bath；When second water-bath is in heating mode, the first water-bath is in refrigeration mode, and the second water-bath connects with humidifier tube
And circulation in the first water-bath, the water in the second water-bath flows out from the delivery port of the second water-bath, enters humidifier tube through the second triple valve
Water inlet, flow out from the delivery port of humidifier tube, enter the water inlet of the second water-bath through the first triple valve, return the second water-bath,
Water in first water-bath flows into the water inlet of the first water-bath from the outlet of the first water-bath through the first two-port valve, returns the first water-bath.
Measure system the most as claimed in claim 1, it is characterised in that described humidifier tube includes the sleeve pipe of outer layer and the pellicle of internal layer
Pipe；The two ends of the semi-transparent membrane tube of described internal layer are respectively provided with air inlet and gas outlet, form gas passage in semi-transparent membrane tube；Institute
It is respectively provided with delivery port and water inlet on the tube wall of the sleeve pipe stating outer layer, is formed between sleeve pipe and the semi-transparent membrane tube of internal layer of outer layer
Aquaporin.
Measure system the most as claimed in claim 2, it is characterised in that the surface of the semi-transparent membrane tube of described internal layer is uniformly covered with aperture,
Aperture is more than the yardstick of hydrone, simultaneously less than the yardstick of molecular cluster.
Measure system the most as claimed in claim 2, it is characterised in that described sleeve pipe uses stainless steel；Described semi-transparent membrane tube uses dagger-axe
Er Tesi Gore-Tex material.
Measure system the most as claimed in claim 1, it is characterised in that at the second turbidimetric air inlet and gas outlet, respectively arrange one
Piece warm and humid probe.
Measure system the most as claimed in claim 1, it is characterised in that when described first water-bath is in heating mode, at the second water-bath
In refrigeration mode, the first two-port valve turns off, the second two-port valve connection, the first of the first triple valve and second mouthful of connection, the
Three mouthfuls of shutoffs, the first of the second triple valve and second mouthful of connection, the 3rd mouthful of shutoff；Described second water-bath is in heating mode
Time, the first water-bath is in refrigeration mode, first two-port valve connection, second two-port valve connection, the first of the first triple valve and
3rd mouthful of connection, second mouthful of shutoff, the first of the second triple valve and the 3rd mouthful of connection, second mouthful of shutoff.
Measure system the most as claimed in claim 1, it is characterised in that described first and second two-port valves use two-way electromagnetic valve, and
It is respectively connecting to computer；First and second triple valves use three-way magnetic valve, and are respectively connecting to computer.
8. the measuring method of an aerosol scattering moisture absorption growth factor, it is characterised in that described measuring method comprises the following steps:
1) opening the first and second water-baths and the first and second nephelometers, aerosol sample gas enters drying tube, and dried gas is molten
Glue sample gas is divided into two-way, and a road enters the first nephelometer, measures the Aerosol scattering coefficient under drying regime；Another road is first
By humidifier tube, enter back into the second nephelometer, measure the Aerosol scattering coefficient after humidification；
2) the first water-bath is in heating mode, and the second water-bath is in refrigeration mode, and the first water-bath connects and the second water-bath with humidifier tube
Doing interior circulation, the water in the first water-bath flows out from the delivery port of the first water-bath, enters water through what the second triple valve entered humidifier tube
Mouthful, the flow direction of water is contrary with the flow direction of aerosol sample gas, water the sleeve pipe of outer layer and internal layer semi-transparent membrane tube it
Between form aquaporin and pass through, hydrone penetrates into humidifier colloidal sol sample gas in semi-transparent membrane tube by aperture, and drop is semi-transparent
Membrane tube stops the delivery port outflow from humidifier tube, enters the water inlet of the first water-bath through the first triple valve, returns the first water-bath,
Water in second water-bath flows into the water inlet of the second water-bath from the outlet of the second water-bath through the second two-port valve, returns the second water-bath；
3) aerosol sample gas humidifies in humidifier tube, and relative humidity is gradually increasing, when aerosol sample gas is humidified the wettest to threshold value
After degree, the first water-bath switches to refrigeration mode, and the second water-bath switches to heating mode, changes the first and second two simultaneously
The state of logical valve and the first and second triple valves is to change water circulation pipe so that the second water-bath connect with humidifier tube and the
Interior circulation is done in one water-bath, and the relative humidity of aerosol sample gas declines rapidly, the most slowly rises along with the second heating water bath afterwards；
4) the second water-bath is in heating mode, and the first water-bath is in refrigeration mode, and the water in the second water-bath is from the water outlet of the second water-bath
Mouthful flow out, enter the water inlet of humidifier tube through the second triple valve, the flow direction phase of the flow direction of water and aerosol sample gas
Instead, water forms aquaporin between the sleeve pipe and the semi-transparent membrane tube of internal layer of outer layer and passes through, and hydrone penetrates into half by aperture
Humidifier colloidal sol sample gas in permeable membrane pipe, and by semi-transparent membrane tube, drop is stopped that the delivery port from humidifier tube flows out, through the first threeway
Valve enters the water inlet of the second water-bath, returns the second water-bath, the water in the first water-bath from the outlet of the first water-bath through the one or two
Logical valve flows into the water inlet of the first water-bath, returns the first water-bath；
5) the most humidified to threshold value relative humidity when aerosol sample gas, the second water-bath switches to refrigeration mode, and the first water-bath
Switching to heating mode, the state simultaneously changing the first and second two-port valves and the first and second triple valves is followed to change water
Endless tube road so that the first water-bath connects with humidifier tube and interior circulation is done in the second water-bath, and the relative humidity of aerosol sample gas is rapid
Decline, the most slowly rise along with the first heating water bath afterwards；
6) step 2 is repeated)～5), until data acquisition is complete, successively turn off the first and second water-baths and first and second turbid
Degree meter；
7) the Aerosol scattering coefficient σ under drying regime is obtained according to the first nephelometer measurementsp,dry, and the measurement of the second nephelometer
Aerosol scattering coefficient σ after humidificationsp(RH) aerosol scattering moisture absorption growth factor f (RH), is obtained:
F (RH)=σsp(RH)/σsp,dry。
9. measuring method as claimed in claim 8, it is characterised in that in step 7) in, utilize and be separately positioned on the second nephelometer
Air inlet and two warm and humid probes of gas outlet and the second nephelometer cavity in temperature measured value, derive the second nephelometer chamber
Internal relative humidity.
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