CN203037514U - Acquisition device for fine atmospheric aerosol particles and gaseous precursors - Google Patents

Acquisition device for fine atmospheric aerosol particles and gaseous precursors Download PDF

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Publication number
CN203037514U
CN203037514U CN 201220693796 CN201220693796U CN203037514U CN 203037514 U CN203037514 U CN 203037514U CN 201220693796 CN201220693796 CN 201220693796 CN 201220693796 U CN201220693796 U CN 201220693796U CN 203037514 U CN203037514 U CN 203037514U
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China
Prior art keywords
ram
anemostat
gas
annular
section
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Expired - Fee Related
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CN 201220693796
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Chinese (zh)
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朱彬
王红磊
张泽锋
沈利娟
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Nanjing University of Information Science and Technology
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Nanjing University of Information Science and Technology
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Abstract

The utility model discloses an acquisition device for fine atmospheric aerosol particles and gaseous precursors. The acquisition device is characterized in that a sharp cyclone separator is arranged at an atmosphere inlet, and large-diameter aerosol particles in samples of the atmosphere can be filtered, so that acquisition results are prevented from being affected by the large particles in an acquisition procedure. The acquisition device has the advantages that inner tubes of annular diffusion tubes of the acquisition device are pluggable, accordingly, errors of outer tubes due to coatings when the traditional annular diffusion tubes are coated are reduced, and the acquisition efficiency is improved; and the acquisition device is practical and convenient, and is low in cost and high in acquisition efficiency, and gaseous pollutants and the aerosol particles can be acquired simultaneously.

Description

The harvester of a kind of atmospheric aerosol fine particle and gaseous precursors thing
Technical field
The utility model relates to the harvester of a kind of atmospheric aerosol fine particle mass concentration and chemical constitution and gaseous precursors thing, particularly a kind of anemostat of gathering the gaseous precursors thing.
Background technology
In recent years, about atmospheric aerosol fine particle mass concentration and chemical constitution thereof, and atmosphere neutral and alkali gas NH 3With sour gas H 2SO 4, HNO 3, HONO and HCl harvester great improvement has been arranged, such as Li Lizheng application (analytical chemistry, 20 (2): 226-236) in describe the making of circular anemostat, annular anemostat and application in atmospheric sampling thereof of anemostat technology in atmospheric sampling in 1992.The Monitoring acidic air pollutants near Rome by means of diffusion lines:development of a specific quality control procedure(Atmospheric Environment that C Perrino etc. delivered in calendar year 2001,35 (2): think 331-341) that annular anemostat-stacked film is the method for very effectively gathering gaseous state and particulate form pollutant simultaneously.Anemostat-stacked embrane method is to control the sampling flow velocity with mass flow controller to annular, and under constant flow rate, at first the flow through anemostat of two series connection of air mass is removed atmosphere neutral and alkali gas NH 3With sour gas H 2SO 4, HNO 3, HONO and HCl, flow through successively then Teflon film, nylon membrane and impregnation of fibers film are gathered particle respectively, particle decomposes the HNO that produces 3And NH 3Vertically place when anemostat and stacked film sampling, reduce the influence of particle gravity settling.This method has solved the acquisition problems of aerosol granules and gaseous precursors thing in the atmosphere effectively, but also have weak point: 1, the atmosphere air intake opening does not have to do relevant cutting process, all gasoloids and gas are all fed ring pipe, therefore and the coefficient of diffusion difference of the particulate of different-grain diameter under same flow velocity can not guarantee that ring pipe is gathered to be entirely gas; 2, at outer ring surface coating is arranged also during the ring pipe coating, this will influence the calculating of ring pipe actual acquisition efficient; 3, used ring pipe whole of need during continuous sampling are changed.In addition, this method does not also have simple and practical finished product harvester at present.
The utility model content
The technical matters that solves:A kind of atmospheric aerosol fine particle that the utility model provides and the harvester of gaseous state precursor, be provided with the sharp cyclone separator of cutting at the atmosphere air intake opening and filter macroparticle, but pipe is set to draw and insert-type in the annular anemostat, has reduced sampling error, simplify sampling process, improved collecting efficiency.
Technical scheme:The harvester of a kind of atmospheric aerosol fine particle and gaseous state precursor, it comprises filtration unit in early stage, gas collector, gasoloid gathering-device, volume control device and five parts of propulsion system; Early stage, filtration unit was a sharp cyclone separator of cutting; Gas collector is the annular anemostat of two series connection: gather alkaline gas annular anemostat and gather sour gas annular anemostat; The gasoloid gathering-device is a gasoloid ram; Volume control device is a flow controller; Propulsion system are an aspiration pump; Be linked in sequence with connecting pipe between each device;
Described annular anemostat comprises outer tube and interior pipe: interior Guan Weike draw and insert-type, be the glass tube of closed at both ends, head into a cone shape, afterbody is connected with the outer tube frosted by piston, the piston outside is provided with handle; Interior pipe is divided into the section of giving vent to anger, sampling section and air inlet section, and the section of giving vent to anger and air inlet section are made smooth treatment, and the sampling section is done frosted and handled; Outer tube head is provided with the taper air intake opening, and the gas outlet is positioned on the relative outer tube wall of the pipe section of giving vent to anger.
Described gasoloid ram comprises ground floor ram, second layer ram and the 3rd layer of ram, ground floor ram and the 3rd layer of ram are streamlined cone structure, fixedly connected by screw thread between three layers of ram, and use O type rubber sealing, every layer of ram all is provided with collection plate, even distribution spout on the collection plate, gas enters from the ground floor ram, flows out from the 3rd layer of ram.
Beneficial effect:(1) the utility model is provided with the sharp cyclone separator of cutting at the atmosphere air intake opening, the particulate of greater particle size in the atmosphere can be filtered out from sample, influences collection result to prevent macroparticle in gatherer process.
(2) Guan Weike draw and insert-type in the annular anemostat of the present utility model only needs during use that interior pipe sampling section is carried out coating and collects gas, and manages in only need changing when continuous sampling and get final product.Compare the also coated error that causes of the non-sampling section of outer tube when having reduced coating with the traditional endless anemostat.The traditional endless anemostat needs whole to change annular anemostat during continuous sampling, namely needs to take off gas collecting device is whole, is not easy to long-time a large amount of sampling.The zone of transition that gas laminar flow and turbulent flow are changed mutually in the interior pipe of annular anemostat is made smooth treatment, avoids the inertia effect of aerosol particle thing under turbulent environment to be adsorbed on sample region measurement result is caused error.
(3) the utility model apparatus structure is simple, low cost of manufacture, and the acquisition precision height, gas is collected and the gasoloid gathering-device can be taken use apart, can also be added in other observation instrument, and not observed the restriction of place and observing environment.
Description of drawings
Fig. 1 is the structural representation of harvester;
Fig. 2 is annular anemostat structural representation;
Fig. 3 is gasoloid ram structural representation.
Wherein, the sharp cyclone separator of cutting of 11-, 12-are gathered alkaline gas annular anemostat, and 13-gathers sour gas annular anemostat, 14-gasoloid ram, 15-connecting pipe, 16-flow controller, 17-aspiration pump; The 21-outer tube, pipe in the 22-, the 211-air intake opening, the 212-gas outlet, the 221-piston, the 222-handle, the 223-section of giving vent to anger, 224-sample section, 225-air inlet section; 31-ground floor ram, 32-second layer ram, the 3rd layer of ram of 33-, 34-collection plate, 35-spout.
Embodiment
Embodiment 1
A kind of atmospheric aerosol fine particle that the utility model provides and the harvester of gaseous state precursor comprise filtration unit in early stage, gas collector, gasoloid gathering-device, volume control device and five parts of propulsion system; Early stage, filtration unit was a sharp cyclone separator 11 of cutting; Gas collector is the annular anemostat of two series connection: gather alkaline gas annular anemostat 12 and gather sour gas annular anemostat 13; The gasoloid gathering-device is a gasoloid ram 14; Volume control device is a flow controller 16; Propulsion system are an aspiration pump 17; Be linked in sequence with connecting pipe 15 between each device.
Described annular anemostat comprises outer tube 21 and interior pipe 22: but interior pipe 22 is draw and insert-type, is the glass tube of closed at both ends, head into a cone shape, afterbody is connected with outer tube 21 frosteds by piston 221, piston 221 outsides are provided with handle 222; In pipe 22 be divided into the section of giving vent to anger 223, sampling section 224 and air inlet section 225, the section of giving vent to anger 223 and air inlet section 225 are made smooth treatment, the frosted processing is done in sampling sections 224; Outer tube 21 heads are provided with taper air intake opening 211, and gas outlet 212 is positioned on the relative outer tube wall of pipe 22 sections of giving vent to anger 223.
Described gasoloid ram comprises ground floor ram 31, second layer ram 32 and the 3rd layer of ram 33, ground floor ram 31 and the 3rd layer of ram 33 are streamlined cone structure, fixedly connected by screw thread between three layers of ram, and use O type rubber sealing, every layer of ram all is provided with collection plate 34, even distribution spout 35 on the collection plate, gas enters from ground floor ram 31, flows out from the 3rd layer of ram 33.
Described sharp cyclone separator 11 manufacturers of cutting are U.S. BGI Incorporated company, and model is SCCA-PM 2.5Be applied to fields such as the discrete sampling of noxious material in continuous particle monitoring instrument air intake opening, IAQ (indoor air quality) sampling air intake opening, the air and laboratory gasoloid separate study, clean and once can sample in continuous 30 days 24 hours, can do sampling (under the no deep-fried twisted dough sticks spare), design is revolved in sharp switchback makes it have better perviousness and cutting performance, cleaning process is simple, and PM 2.5Sampling passed through the authentication of U.S. EPA.
Embodiment 2
Aspiration pump 17 is bled and is allowed aerosol particle in the atmosphere through the sharp cyclone separator 11 of cutting during sampling, and bulky grain is filtered; Remaining particle and gas enter annular anemostat then, during by annular anemostat, air-flow is laminar flow, because the coefficient of diffusion of gas molecule in laminar flow is much larger than the coefficient of diffusion of particle, therefore gaseous contaminant is collected by diffusion process, and the aerosol particle thing then enters next device with sampling air flow.Different compounds differs bigger to the adsorption efficiency of gas with various, therefore can collect different gaseous contaminants by carrying out coating at the different compound of sampling section 224 usefulness.Gathering alkaline gas annular anemostat 12 and gathering alkaline gas annular anemostat 13 and adopt citric acid and Na respectively 2CO 3As the coated substance that absorbs gas, by the alkaline gas NH in this coating absorption atmosphere 3With sour gas H 2SO 4, HNO 3, HONO and HCl; Residual gas sol particle thing enters in the gasoloid ram 14 with sampling air flow and collects then, on collection plate 34, place miillpore filter respectively, when sample gas sees through filter membrane, thereby particle is collected owing to inertia effect strikes on the filter membrane, gas molecule since molecular diameter much smaller than the filter membrane micropore, therefore see through filter membrane mostly and seldom be adsorbed, but the suction-operated difference of the filter membrane gas molecule of unlike material.The teflon filter membrane to particle see through the arresting efficiency height, blank low, do not absorb gas; Nylon membrane is to HNO 3Absorption efficiency surpass 95%; The impregnation of fibers film is to gather NH 3Method commonly used has characteristics such as simple, convenient, collecting efficiency and selectivity height.The effect of the nitrate of the first tunic collection and the volatilization of ammonium salt and gas can cause HNO 3And NH 3Loss, therefore place teflon filter membranes, nylon membrane, impregnation of fibers film at ground floor ram 31, second layer ram 32 and the 3rd layer of ram 33 respectively, gather particle successively, particle decomposes the HNO that produces 3And NH 3, second layer ram 32 and the 3rd layer of HNO that ram 33 is gathered 3And NH 3Be used for proofreading and correct the data of the particle of gathering in the ground floor ram 31; Whole sampling process is carried out flow control by flow controller 16, this process can be at interval can also be continuous; The gasoloid filter membrane that the gas componant of last annular anemostat collection and gasoloid ram 14 are collected can be weighed and chemical composition analysis by balance in the laboratory.
This device uses and is coated with stain 1%Na 2CO 3The annular anemostat of aqueous solution is gathered H simultaneously 2SO 4, HNO 3, HONO and HCl 24h average absorption efficient be respectively 95.3%, 95.9%, 87.3% and 91.4%, use the annular anemostat that is coated with stain 5% citric acid solution to gather NH 324h average absorption efficient reach 96.4%.
The blank value that is coated with the standby anemostat of stain and filter membrane has been carried out 7 times respectively measured, it is 10l/min that this device arranges the sampling flow velocity, and continuous acquisition 3h has collected 7 groups of gas datas and gasoloid data respectively, and this installs used anemostat to gaseous state H 2SO 4, HNO 3, HONO, HCl and NH 3Detection limit (3 σ) is respectively 0.011 μ g/m 3, 0.021 μ g/m 3, 0.018 μ g/m 3, 0.013 μ g/m 3With 0.041 μ g/m 3, particle quality concentration, particle are decomposed the HNO that produces 3And NH 3Detection limit (3 σ) be respectively 0.239 μ g/m 3, 0.042 μ g/m 3With 0.079 μ g/m 3

Claims (3)

1. the harvester of an atmospheric aerosol fine particle and gaseous state precursor is characterized in that it comprises filtration unit in early stage, gas collector, gasoloid gathering-device, volume control device and propulsion system; Early stage, filtration unit was a sharp cyclone separator (11) of cutting; Gas collector is the annular anemostat of two series connection: gather alkaline gas annular anemostat (12) and gather sour gas annular anemostat (13); The gasoloid gathering-device is a gasoloid ram (14); Volume control device is a flow controller (16); Propulsion system are an aspiration pump (17); Be linked in sequence with connecting pipe (15) between each device.
2. the harvester of a kind of atmospheric aerosol fine particle according to claim 1 and gaseous state precursor, it is characterized in that described annular anemostat comprises outer tube (21) and interior pipe (22): interior pipe (22) but for draw and insert-type, glass tube for closed at both ends, head into a cone shape, afterbody is connected with outer tube (21) frosted by piston (221), and piston (221) outside is provided with handle (222); Interior pipe (22) is divided into the section of giving vent to anger (223), sampling section (224) and an air inlet section (225), and the section of giving vent to anger (223) and air inlet section (225) are made smooth treatment, and sampling section (224) is done frosted and handled; Outer tube (21) head is provided with taper air intake opening (211), and gas outlet (212) are positioned on the relative outer tube wall of pipe (22) section of giving vent to anger (223).
3. the harvester of a kind of atmospheric aerosol fine particle according to claim 1 and gaseous state precursor, it is characterized in that described gasoloid ram comprises ground floor ram (31), second layer ram (32) and the 3rd layer of ram (33), ground floor ram (31) and the 3rd layer of ram (33) are streamlined cone structure, fixedly connected by screw thread between three layers of ram, and use O type rubber sealing, every layer of ram all is provided with collection plate (34), even distribution spout (35) on the collection plate, gas enters from ground floor ram (31), flows out from the 3rd layer of ram (33).
CN 201220693796 2012-12-14 2012-12-14 Acquisition device for fine atmospheric aerosol particles and gaseous precursors Expired - Fee Related CN203037514U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103033400A (en) * 2012-12-14 2013-04-10 南京信息工程大学 Collection device of fine atomospheric aerosol particle and gaseous precursor
CN111372524A (en) * 2017-09-12 2020-07-03 纽卡斯尔诺森比亚大学 Impact sampler for aerosol component collection

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103033400A (en) * 2012-12-14 2013-04-10 南京信息工程大学 Collection device of fine atomospheric aerosol particle and gaseous precursor
CN103033400B (en) * 2012-12-14 2015-04-29 南京信息工程大学 Collection device of fine atomospheric aerosol particle and gaseous precursor
CN111372524A (en) * 2017-09-12 2020-07-03 纽卡斯尔诺森比亚大学 Impact sampler for aerosol component collection
CN111372524B (en) * 2017-09-12 2023-09-19 纽卡斯尔诺森比亚大学 Impact sampler for aerosol component collection

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