CN109211827A - Volatile organic compounds measurement device and method - Google Patents
Volatile organic compounds measurement device and method Download PDFInfo
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- CN109211827A CN109211827A CN201811258917.6A CN201811258917A CN109211827A CN 109211827 A CN109211827 A CN 109211827A CN 201811258917 A CN201811258917 A CN 201811258917A CN 109211827 A CN109211827 A CN 109211827A
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 178
- 238000000034 method Methods 0.000 title claims abstract description 98
- 238000005259 measurement Methods 0.000 title claims abstract description 87
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000000926 separation method Methods 0.000 claims abstract description 83
- 238000003795 desorption Methods 0.000 claims abstract description 48
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 44
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 44
- 239000012080 ambient air Substances 0.000 claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 33
- 238000010521 absorption reaction Methods 0.000 claims abstract description 31
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 claims abstract description 30
- 238000001179 sorption measurement Methods 0.000 claims abstract description 26
- 238000002407 reforming Methods 0.000 claims abstract description 23
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 21
- 230000003647 oxidation Effects 0.000 claims abstract description 19
- 239000003054 catalyst Substances 0.000 claims abstract description 16
- 230000008719 thickening Effects 0.000 claims abstract description 4
- 229960004424 carbon dioxide Drugs 0.000 claims description 46
- 239000012528 membrane Substances 0.000 claims description 17
- 238000005070 sampling Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 12
- 239000003570 air Substances 0.000 claims description 11
- 239000003463 adsorbent Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229910002090 carbon oxide Inorganic materials 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 150000002894 organic compounds Chemical class 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 230000001737 promoting effect Effects 0.000 claims description 4
- 239000013618 particulate matter Substances 0.000 claims description 3
- 230000003694 hair properties Effects 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 54
- 230000008569 process Effects 0.000 description 43
- 230000035945 sensitivity Effects 0.000 description 21
- 229930195733 hydrocarbon Natural products 0.000 description 20
- 150000002430 hydrocarbons Chemical class 0.000 description 14
- 238000010586 diagram Methods 0.000 description 12
- 239000004215 Carbon black (E152) Substances 0.000 description 11
- -1 methane hydro carbons Chemical class 0.000 description 11
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 9
- AIJULSRZWUXGPQ-UHFFFAOYSA-N Methylglyoxal Chemical compound CC(=O)C=O AIJULSRZWUXGPQ-UHFFFAOYSA-N 0.000 description 8
- 238000012790 confirmation Methods 0.000 description 8
- 238000011010 flushing procedure Methods 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 6
- 238000007791 dehumidification Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 230000008676 import Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- AYKYXWQEBUNJCN-UHFFFAOYSA-N 3-methylfuran-2,5-dione Chemical compound CC1=CC(=O)OC1=O AYKYXWQEBUNJCN-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 241000790917 Dioxys <bee> Species 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N formaldehyde Natural products O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 239000008277 atmospheric particulate matter Substances 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
- G01N21/3518—Devices using gas filter correlation techniques; Devices using gas pressure modulation techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a kind of volatile organic compounds measurement device and methods, wherein the device includes: acquisition device for acquiring ambient air；Volatile organic compounds of the concentration and separation device for containing in Adsorption Concentration ambient air；Desorption separation device is used to be adsorbed on the volatile organic compounds Desorption separation of thickening apparatus；Reforming unit is used to convert carbon dioxide by the oxidation of catalyst for the volatile organic compounds that Desorption separation goes out；Analytical equipment is used to obtain the content of carbon dioxide by on-dispersive type infrared absorption, and obtains carbon content according to the content of carbon dioxide, to obtain the content of volatile organic compounds.The device is concentrated the volatile organic compounds of low concentration by the way of concentration and separation, to reach the measurement range of NDIR method, and is suitable for measuring the oxygen-containing volatile organic compounds of low concentration.
Description
Technical field
The present invention relates to atmospheric monitoring technical field, in particular to a kind of volatile organic compounds measurement device and side
Method.
Background technique
The emission source of volatile organic compounds (volatile organic compounds, VOCs) is predominantly artificial
Source, including fuel combustion, communications and transportation, coating volatilization etc., excessive emissions VOCs pollution atmospheric environment are detrimental to health, method
Laws & Regulations are in discharge standard of air pollutants and the atmosphere pollutants emission standards of multiple industries to VOCs discharge amount
Have and clearly limit, therefore VOCs content in atmosphere is monitored to protection human health and environmental quality monitoring with important meaning
Justice.
In the related technology, the monitoring method of VOCs have FID method (Flame Ionization Detector, flame ion
Change measuring method), NDIR method (Non-Dispersive Infra-Red, on-dispersive type infrared absorption), PID method (Photo
Ionization Detector, photoionization measuring method) etc..For example, dress is measured using the volatile organic compounds of PID method
It sets.
Precursor one of of the VOCs as photochemical fog in atmosphere has potential danger to atmospheric environment and human health
Evil, should be comprehensively continuous to the VOCs monitoring in atmosphere, and VOCs content at nearly emission source is high, and content is low in atmospheric environment,
General method is difficult to realize carry out continuous on-line determination to low concentration VOCs.Using the VOC measurement device of NDIR method low dense
In the case where degree, sensitivity decrease, accuracy needed for measurement is not achieved.Although FID method can measure the VOCs of low concentration,
OVOC (Oxygenated Volatile Organic Compounds, oxygen-containing volatile organic compounds) is not measured, therefore
Whole content cannot be held.PID method can only measure specific volatile organic compounds, have selectivity to measure object.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide a kind of volatile organic compounds measurement devices.
It is another object of the present invention to the measuring methods for proposing a kind of volatile organic compounds.This method can promote
Fast desorption into VOCs separates, and to improve determination efficiency, while itself generates zero gas, imports zero gas without external, and effectively
The carbon dioxide and moisture in flow path are removed, guarantees the cleaning of flow path and zero gas.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of volatile organic compounds measurement device,
It include: acquisition device for acquiring ambient air；Concentration and separation device is waved for what is contained in ambient air described in Adsorption Concentration
Hair property organic compound；Desorption separation device is used to be adsorbed on the volatile organic compounds desorption point of the thickening apparatus
From；Reforming unit is used to convert dioxy by the oxidation of catalyst for the volatile organic compounds that Desorption separation goes out
Change carbon；Analytical equipment is used to obtain the content of the carbon dioxide by on-dispersive type infrared absorption, and according to described two
The content of carbonoxide obtains carbon content, to obtain the content of the volatile organic compounds.
The sensing equipment of the volatile organic compounds of the embodiment of the present invention can be with by being measured according to NDIR method
Low concentration VOCs in determination of the environment atmosphere, while the fast desorption of VOCs can be promoted to separate using heater, it is surveyed with improving
Determine efficiency, zero gas can be generated in portion in the device, imports zero gas without external, and dehumidification device can effectively remove the water in flow path
Point, guarantee the cleaning of flow path and zero gas, to improve sensitivity and the precision of measurement.
In addition, the sensing equipment of volatile organic compounds according to the above embodiment of the present invention can also have it is following attached
The technical characteristic added:
Further, in one embodiment of the invention, the acquisition device includes: filter, is used for filtered atmospheric
In particulate matter.
Further, in one embodiment of the invention, the concentration and separation device is specifically used for while atmosphere is concentrated
In the volatile organic compounds and separation concentration the volatile organic compounds, the concentration and separation device fills
There are adsorbent and porous polymer, with volatile organic compounds described in adsorption sampling.
Further, in one embodiment of the invention, the Desorption separation device includes: heater for promoting institute
State the fast desorption separation of volatile organic compounds；Cooling fan is used to promote the fast cooling in concentration and separation portion；Quality stream
Amount control device is used to control the flow in instrument flow path within a preset range；Air pump is for being drawn the ambient air.
Further, in one embodiment of the invention, the reforming unit includes: the first converting apparatus, and described
It is filled with oxidation catalyst in one conversion component, so that the VOC oxidation in the ambient air generates institute
State carbon dioxide；Absorption unit of dioxide carbon, which is used to absorb, removes the carbon dioxide that first converting apparatus generates；The first half
Permeable membrane dehumidifier is used to absorb the moisture in the ambient air, removes the water in the absorption unit of dioxide carbon eluting gas
Divide to obtain zero gas；Second converting apparatus is used to that oxygen will to be carried out by the volatile organic compounds of the concentration and separation device outflow
Change and/or heat, to generate carbon dioxide；Second semi-permeable membrane dehumidifier is for removing eluting gas in second converting apparatus
Moisture.
Further, in one embodiment of the invention, zero gas be by the absorption unit of dioxide carbon and
What the first semi-permeable membrane dehumidifier collective effect was got.
Further, in one embodiment of the invention, the analytical equipment is that NDIR measures analytical equipment.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes a kind of volatile organic compounds measurement side
Method, comprising the following steps: acquisition ambient air；The volatile organic compounds contained in ambient air described in Adsorption Concentration；It will
The volatile organic compounds Desorption separation of absorption；The oxygen that the volatile organic compounds that Desorption separation goes out is passed through into catalyst
Change effect is converted into carbon dioxide；The content of the carbon dioxide is obtained by on-dispersive type infrared absorption, and according to institute
The content for stating carbon dioxide obtains carbon content, to obtain the content of the volatile organic compounds.
Further, in one embodiment of the invention, the volatilization contained in ambient air described in the Adsorption Concentration
Property organic compound, further comprise: at the same be concentrated the volatile organic compounds in atmosphere and separation concentration it is described
Volatile organic compounds, with volatile organic compounds described in adsorption sampling.
The volatile organic compounds measuring method of the embodiment of the present invention can be surveyed by being measured according to NDIR method
Determine the low concentration VOCs in ambient air, while the fast desorption of VOCs can be promoted to separate using heater, to improve measurement
Efficiency, can generate zero gas in portion in the device, import zero gas without external, and dehumidification device can effectively remove the water in flow path
Point, guarantee the cleaning of flow path and zero gas, to improve sensitivity and the precision of measurement.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the structural schematic diagram according to the volatile organic compounds measurement device of one embodiment of the invention；
Fig. 2 is the specific composition schematic diagram according to the volatile organic compounds measurement device of one embodiment of the invention；
Fig. 3 is the volatile organic compounds measuring method flow chart according to one embodiment of the invention；
Fig. 4 is the volatile organic compounds measuring method flow chart according to the specific embodiment of the invention one；
Fig. 5 is according to process S2 flow path schematic diagram in the specific embodiment of the invention one；
Fig. 6 is according to process S3 flow path schematic diagram in the specific embodiment of the invention one；
Fig. 7 is according to process S4, S5, S6 flow path schematic diagram in the specific embodiment of the invention one；
Fig. 8 is to measure process according to the volatile organic compounds measuring method Zerobase of the specific embodiment of the invention two
Schematic diagram；
Fig. 9 is to measure process according to the volatile organic compounds measuring method Zerobase of the specific embodiment of the invention three
Schematic diagram；
Figure 10 is to be measured to flow according to the volatile organic compounds measuring method Zerobase of the specific embodiment of the invention three
Journey schematic diagram；
Figure 11 is toluene, the maleic anhydride measurement result figure according to one embodiment of the invention, wherein figure left side is this hair
The measurement result of bright VOC measurement device, figure right side are the measurement result of non-methane hydro carbons instrument；
Figure 12 is according to the citraconic anhydride of one embodiment of the invention, formaldehyde, methyl-glyoxal measurement result figure, wherein
Figure left side is the measurement result of VOC measurement device of the present invention, and figure right side is the measurement result of non-methane hydro carbons instrument.
Description of symbols:
1-VOC measurement device, 101- acquisition device, 102- concentration and separation device, 103- Desorption separation device, 104- conversion
Device, 105- analytical equipment, 2- filter, 3- concentration and separation device, 4- heater, 5- cooling fan, the control of 6- mass flow
Device, 7- air pump, the first reforming unit of 8-, 9- absorption unit of dioxide carbon, the first semi-permeable membrane of 10- dehumidifier, 11- second are converted
Device, 12- the second semi-permeable membrane dehumidifier and 13-NDIR measure analytical equipment.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The volatile organic compounds measurement device proposed according to embodiments of the present invention and method are described with reference to the accompanying drawings,
The volatile organic compounds measurement device proposed according to embodiments of the present invention is described with reference to the accompanying drawings first.
Fig. 1 is the structural schematic diagram of the volatile organic compounds measurement device of one embodiment of the invention.
As shown in Figure 1, the measurement device 1 includes: acquisition device 101, concentration and separation device 102, Desorption separation device
103, reforming unit 104 and analytical equipment 105.
Wherein, acquisition device 101 is for acquiring ambient air；It is concentrated and separated device 102 and is used for Adsorption Concentration ambient air
In the volatile organic compounds that contains；Desorption separation device 103 is used to be adsorbed on the volatile organic compound of thickening apparatus
Object Desorption separation；The volatile organic compounds that reforming unit 104 is used to Desorption separation is turned by the oxidation of catalyst
Turn to carbon dioxide；Analytical equipment 105 be used for by on-dispersive type infrared absorption obtain carbon dioxide content, and according to
The content of carbon dioxide obtains carbon content, to obtain the content of volatile organic compounds.The measurement device 1 of the embodiment of the present invention
The fast desorption of VOCs can be promoted to separate, to improve determination efficiency, while generating zero gas inside device, import zero without external
Gas, and dehumidification device can effectively remove the moisture in flow path, guarantee the cleaning of flow path and zero gas.
Further, in one embodiment of the invention, acquisition device includes: filter, in filtered atmospheric
Particulate matter.In other words, atmosphere acquisition portion acquires ambient air.
Further, in one embodiment of the invention, concentration and separation device is specifically used for while being concentrated in atmosphere
The volatile organic compounds of volatile organic compounds and separation concentration, concentration and separation device is filled with adsorbent and porous poly-
Object is closed, with adsorption sampling volatile organic compounds.
It should be noted that concentration and separation device inner stuffing matter be absorbent-type filler and porous polymer adsorbent,
Atmosphere is set to continue through and VOCs is adsorbed on adsorbent.Can enumerate JL Science company production MS3A, MS4A,
MS13X, TenaxTA, TenaxGR, PorapakS, PorapakQ etc. can be used as the concentration and separation device in the device.
In addition, the heating method of concentration and separation device can select to heat accordingly according to the difference of the adsorbent of filling
Mode, such as the method for being concentrated and separated device and heating that winds metal wire exothermic material can be used, give concentration and separation device
Dosing the insulating layer heat medium method heated, the method heated to concentration and separation device blowing hot-air etc. can be used.
Further, in one embodiment of the invention, Desorption separation device includes: heater for promoting volatility
The fast desorption of organic compound separates；Cooling fan is used to promote the fast cooling in concentration and separation portion；Mass flow control dress
It sets for controlling the flow in instrument flow path within a preset range；Air pump is for being drawn ambient air.
Wherein, ambient air is drawn the air pump to device may be selected gasket type, bellows type, electromagnetic type etc..
Further, in one embodiment of the invention, reforming unit includes: the first converting apparatus, the first conversion group
Oxidation catalyst is filled in part, so that the VOC oxidation in ambient air generates carbon dioxide；Carbon dioxide
Absorption plant is used to absorb the carbon dioxide that the first converting apparatus of removal generates；First semi-permeable membrane dehumidifier is big for absorbing environment
Moisture in gas, the gas of removal absorption unit of dioxide carbon outflow is to obtain zero gas；Second converting apparatus is used for will be by being concentrated
The volatile organic compounds of separator outflow is aoxidized and/or is heated, to generate carbon dioxide；The dehumidifying of second semi-permeable membrane
Device is used to remove the moisture of eluting gas in the second converting apparatus.Wherein, zero gas is by absorption unit of dioxide carbon and first
Semi-permeable membrane dehumidifier collective effect is got, and is got alone by the first semi-permeable membrane dehumidifier.
It should be noted that the usable appendix of reforming unit internal oxidition catalyst has the aluminium oxide of the noble metals such as platinum, palladium, rhodium system
With the metal oxides such as cerium oxide.
In short, the volatile organic compounds contained in concentrating part Adsorption Concentration sample atmosphere, Desorption separation portion will inhale
It is attached to the volatile organic compounds Desorption separation of concentrating part, conversion portion passes through the volatile organic compounds that Desorption separation goes out
The oxidation of catalyst is converted into carbon dioxide.
Further, in one embodiment of the invention, analytical equipment is that NDIR measures analytical equipment.
It is understood that analysis portion utilizes NDIR method (Non-Dispersive Infra-Red, on-dispersive type infrared ray
Absorption process) carbon dioxide content generated is measured, and it is converted into carbon content, to obtain the content of volatile organic compounds.
To sum up, the continuous mode of the volatile organic compounds measurement device of the embodiment of the present invention are as follows:
1) the atmosphere collection process of ambient air is acquired；
2) concentration process of volatile organic compounds included in the atmosphere of efficient absorption concentration acquisition；
3) the Desorption separation process of the volatile organic compounds of effective Desorption separation concentration；
4) by VOC oxidation that Desorption separation goes out and the conversion process of carbon dioxide is generated using catalyst；
5) conversion portion is measured according to NDIR method (Non-Dispersive Infra-Red, on-dispersive type infrared absorption)
The content of the carbon dioxide of generation, is converted into carbon content, calculates the analytic process of content of volatile organic compound.
As shown in Fig. 2, being carried out below to the specific composition of the volatile organic compounds measurement device of the embodiment of the present invention
It is described in detail.
The specific composition component of volatile organic compounds measurement device has filter, concentration and separation device, heater, cold
But fan, mass flow control appts, air pump, the first reforming unit, absorption unit of dioxide carbon, the first semi-permeable membrane dehumidifier,
Second reforming unit, the second semi-permeable membrane dehumidifier, NDIR measurement analytical equipment, automatic sensitivity confirm system, connect matching for each portion
The solenoid valve V1-V10 of pipe and switching flow path.
Filter: polytetrafluoroethylene (PTFE) material, the particulate matter in filtered atmospheric are used.
Concentration and separation device: the device has the function of the VOCs of the VOCs being concentrated in atmosphere and separation concentration, dress simultaneously
Set filled with adsorbent and porous polymer, can volatile organic matter in efficient absorption sampling atmosphere, enrichment facility capacity is
5-50cc。
Heater: VOCs quickly and effectively Desorption separation of the device to promote concentration, if the VOCs of Adsorption Concentration from
It is slowly flowed out in concentration and separation device, the VOCs concentration for reaching analysis portion is still lower, and NDIR method measures precision and reduces, and dense
Division is from losing meaning, it is therefore desirable to heater be utilized to promote the fast desorption separation of VOCs.Heating means and condition, need basis
The adsorbent type filled in concentration and separation device is selected, and wire fever, insulating layer heating, heat can be used in heating means
The methods of wind.
Cooling fan: fast cooling of the device to promote concentration and separation portion, when VOCs carries out Desorption separation, concentration point
From portion since the operative temperature of heater is higher, and in order to be conducive to quickly start sampling determination next time, concentration and separation need to be made to fill
Adsorption Concentration can be carried out again by setting temperature and dropping to, therefore cooling fan is arranged and quickly adjusts concentration and separation portion temperature.
Mass flow control appts: the device is used to control the flow in instrument flow path, sets range of flow as 100-
1000mL/min。
Air pump: ambient air is drawn into device using air pump, gasket type, bellows type, electromagnetic type etc. can be used in air pump.
First reforming unit: being filled with oxidation catalyst in the first reforming unit, the pretreatment dress of zero gas is generated as instrument
It sets, aoxidizes the VOCs in ambient air and generate carbon dioxide, which is not passed through concentration and separation device.Oxidation catalyst can
There are aluminium oxide, the oxidation cerium metal oxide catalyst of the noble metals such as platinum, palladium, rhodium system using appendix, or is promoted using heating device
VOCs oxidation reaction.
Absorption unit of dioxide carbon: the device is used to absorb the carbon dioxide that removal reforming unit 1 generates, thus further
Promote the generation of zero gas.
First semi-permeable membrane dehumidifier: the device is used to absorb the moisture in ambient air, to remove carbon dioxide absorption
Moisture in device eluting gas is to obtain zero gas.
Second reforming unit: the device is that the VOCs that will be flowed out by concentration and separation device carries out oxidation generation carbon dioxide,
The device can also be heated, and oxidation reaction is promoted.
Second semi-permeable membrane dehumidifier: the device is used to remove the moisture of eluting gas in the second reforming unit, to prevent influencing
Measurement result.
NDIR measures analytical equipment: the device measures carbon dioxide content using on-dispersive type infrared absorption, passes through
VOCs contained in sampling atmosphere has been completely converted into carbon dioxide, therefore NDIR has been surveyed by a series of processing of front end
The carbon dioxide content of setting analysis device measurement is converted into carbon content, is as converted into the VOCs content of carbon.
Automatic sensitivity confirms system: there is the present invention automatic sensitivity to confirm system, can carry out instrument sensitivity confirmation automatically,
The system can confirm instrumental sensitivity during the measurement using adjacent measurement result twice, the indicated value (peak area)
It can be used as the index of instrumental correction and confirmation concentration and separation device degradation, to confirm instrument state at any time.To make this
Confirmation process measurement result is more accurate, and it is true usually to carry out sensitivity by way of measuring zero gas and SPAN gas (calibrating gas)
Recognize, zero gas is generated by instrument, and SPAN gas is passed through by the steel cylinder equipped with calibrating gas.Automatic sensitivity confirmation system can be as needed
The sets itself frequency, while can according to need the correction coefficient that instrument whether is changed after setting sensitivity confirms.
The volatile organic compounds measurement device proposed according to embodiments of the present invention, by being surveyed according to NDIR method
It is fixed, can be with the low concentration VOCs in determination of the environment atmosphere, while the fast desorption of VOCs can be promoted to separate using heater, with
Determination efficiency is improved, zero gas can be generated in portion in the device, imports zero gas without external, and dehumidification device can effectively remove flow path
In moisture, guarantee flow path and zero gas cleaning, to improve sensitivity and the precision of measurement.
The volatile organic compounds measuring method flow chart proposed according to embodiments of the present invention is described referring next to attached drawing.
As shown in figure 3, the volatile organic compounds measuring method, comprising the following steps:
In step s101, ambient air is acquired.
In step s 102, the volatile organic compounds contained in Adsorption Concentration ambient air.
Further, in one embodiment of the invention, the volatile organic contained in Adsorption Concentration ambient air
Object is closed, further comprises: while the volatile organic compounds of the volatile organic compounds in atmosphere and separation concentration is concentrated,
With adsorption sampling volatile organic compounds.
In step s 103, by the volatile organic compounds Desorption separation of absorption.
In step S104, two are converted by the oxidation of catalyst by the volatile organic compounds that Desorption separation goes out
Carbonoxide.
In step s105, the content of carbon dioxide is obtained by on-dispersive type infrared absorption, and according to titanium dioxide
The content of carbon obtains carbon content, to obtain the content of volatile organic compounds.
As shown in figure 4, being illustrated below according to specific embodiment to volatile organic compounds measuring method.
By the access power supply booting of VOC measurement device, start to measure process.
S1: the first step is that measurement is standby, in order to run VOC measurement device normal table, needs standby a few minutes, such as can
It sets stand-by time to 1 minute.
S2: second step is acquisition atmosphere, and after standby, VOC measurement device starts to be acquired ambient air, and to adopting
The atmosphere of collection carries out VOCs Adsorption Concentration.The acquisition Atmospheric processes of S2 include atmospheric sampling process and Adsorption Concentration process.VOC is surveyed
Device acquisition Atmospheric processes operation explanation is determined as shown in figure 5, solid black lines are acquisition atmosphere mistake in the flow circuit diagram of measurement device
The flow path that journey gas flows through, dotted line are the flow path not flowed through, and in each solenoid valve, left side blacking is closed state, are whitewashed to open
State, mark are suitable for following flow circuit diagram.Flow path is by 6 mass flow control appts and 7 air pumps, so that measurement device is with one
Fixed flow collection ambient air.The acquisition atmosphere and Adsorption Concentration process are 18 minutes.
S3: third step is to rinse, and flushing process gas flow path is as shown in Figure 6.Enter flushing process after sampling process,
The process by atmosphere and flow path moisture and carbon dioxide remove, generate zero gas flushing and be concentrated and separated device, flushing process holds
It is 120 seconds continuous.
S4: the four step is backwash 1, and 1 process gas flow path of backwash is as shown in Figure 7.After flushing process, carry out anti-
1 process is rinsed, the operation of this process heater is heated to 150 DEG C, heats to concentration and separation device, promotes VOCs desorption point
From, meanwhile, zero gas makes the VOCs of Desorption separation flow to reforming unit 2 as the concentrated separator of mobile phase reverse flow, conversion
VOCs is oxidized to carbon dioxide by device, then removes moisture removal through translucent dehumidifier 2, is measured analytical equipment by NDIR and is measured two
Content of carbon oxide finally drains into outside device.It backwashes 1 process and continues 240 seconds.
S5: the five step is backwash 2, and gas flow path is identical as S4, and backwash 2 process heaters operation is heated to 180 DEG C,
Concentration and separation device is heated, VOCs whole Desorption separation of the step to guarantee Adsorption Concentration, so that it is guaranteed that measurement
As a result accuracy, other processes are identical as S4.It backwashes 2 processes and continues 90 seconds.
S6: the six step is backwash 3, and gas flow path is identical as S4, S5.It is out of service to backwash 3 process heaters, it is cooling
Fan operation cools down concentration and separation device, so that temperature gradually decreases down and can carry out the temperature of Adsorption Concentration again and want
It asks.It backwashes 3 processes and continues 240 seconds.
S7: the seven step is the output process of VOCs, which backwashes 1 process with S4 and carry out simultaneously, by NDIR measurement point
Analysis apparatus measures carbon dioxide, and is converted into carbon content and is exported.
The present invention is as described above, VOC measurement device acquires atmosphere, Adsorption Concentration, Desorption separation, obtained high concentration
VOCs is converted into high concentration carbon dioxide through peroxidating, is measured by NDIR method, since measure object is high concentration VOCs, because
This can carry out Accurate Determining using NDIR method, and OVOCs is determined in a pacing of going forward side by side.
Above-mentioned specific embodiment was carried out in the preceding half an hour of device operation, and another specific embodiment of the invention is to fill
It sets in the half an hour after of operation and carries out, the embodiment of half an hour after is as follows:
In the embodiment of half an hour after, three-way magnetic valve is provided between reforming unit 2 and semi-permeable membrane dehumidifier 2
V9, in flow path designs in addition to around reforming unit 2, other continuous modes and flow path and preceding half an hour embodiment are all the same.Through
Over-sampling process, flushing process do not pass through reforming unit 2 when backwashing 1 process, i.e. the VOCs of Adsorption Concentration will not be oxidized into
Carbon dioxide, so that NDIR monitoring measurement analytical equipment can not be measured.Zerobase measurement can be carried out as a result,.At this
It invents in VOC measurement device, when measuring Zerobase, in addition to not passing through reforming unit 2, other are identical as sampling determination, because
This, the determination condition and sampling determination condition of Zerobase is essentially identical, so that Zerobase measured value is more accurate.
Zerobase continuous mode flow path schematic diagram is as seen in figs. 8-10.
Volatile organic compounds measurement device below with the embodiment of the present invention and the non-methane using FID method are hydrocarbon
Compound instrument is determined a variety of hydrocarbons, to be compared.
The VOC measurement device measurement period is 30 minutes, and the measurement period of non-methane hydro carbons instrument is 6 minutes.VOC is surveyed
Determine device sampling process flow velocity and be set as 500mL/min, acquires 18 minutes, acquire 9000mL atmosphere altogether, flushing process is set as 2 points
Clock, 1 process of backwash are set as 4 minutes, and 2 processes of backwash are set as 1.5 minutes, and 3 processes of backwash are set as 4 minutes.As measurement
The hydrocarbon of object has toluene, maleic anhydride, citraconic anhydride, formaldehyde, methyl-glyoxal.
As depicted in figs. 11-12, by measurement result it is found that the embodiment of the present invention and non-methane hydro carbons instrument are in measurement first
Hydrocarbon peak can be measured when benzene, methyl-glyoxal, i.e. two instrument can carry out toluene, methyl-glyoxal quasi-
Really measurement.And when measuring maleic anhydride, citraconic anhydride and formaldehyde, the measurement result of non-methane hydro carbons instrument does not occur
Indicate the wave crest of hydrocarbon, it can thus be appreciated that non-methane hydro carbons instrument can not measure these oxygen-bearing hydrocarbons, and
It is compared by measurement result of the embodiment of the present invention it is found that the present invention can measure the oxygen-containing carbon such as maleic anhydride, citraconic anhydride and formaldehyde
Hydrogen compound.
The results are shown in Table 1 for hydrocarbon determination of recovery rates of two instrument to a variety of known concentrations.Determination of recovery rates
Method is as follows:
Hydrocarbon is put into vessel, vessel are placed in water-bath or husky desire slot, zero gas, gas flow V1 are passed through
(L/min), so that hydrocarbon distillation or vaporization, generate the gas containing hydrocarbon.The nytron generated at this time
Object concentration is higher, without concentration, directly by reforming unit and dehumidification device, is surveyed using NDIR measurement device to VOC
Fixed, concentration is set as C1 (gC/L), is diluted using zero gas V2 (L/min) to above-mentioned high concentration VOC, obtained diluted concentration is
C2 (gC/L),
C2=C1*V1/ (V1+V2)
Using the gas flow V3 (L/min) and time (min) for passing through device, the hydrocarbon for passing through device can be obtained
Carbon content CA (g),
CA=T*C2*V3
The carbon content CA ' passed through in NDIR measurement device by NDIR measurement device detection value C3 (gC/L), pass through NDIR
The flow value V3 (L/min) and peak value time of occurrence of measurement device integrate to obtain, its calculation formula is:
CA '=∫ (C3) (V3) dt
The rate of recovery can be calculated by CA and CA ', as a result as shown in each hydrocarbon rate of recovery of table 1,
The rate of recovery (%)=CA '/CA*100
It is evaluated for the sensitivity to VOC measurement device of the present invention, detection limit, blank is calculated by three times zero standard deviation
Sample is zero gas, and VOC measurement device detection limit is about 8.4ppbC, and non-methane hydro carbons instrument is about with detection limit
10ppbC.It is directly examined using the VOC detector that NDIR measurement device carries out carbon dioxide detection without VOCs Adsorption Concentration
Rising limit is about 500ppbC, it can thus be appreciated that VOC measurement device sensitivity of the present invention is very high.As described above, VOC measurement dress of the present invention
The high assay sensitivity set is to be concentrated and realized based on efficient absorption of the enrichment facility to VOC.
It is estimated by the continuous mode of VOC measurement device of the present invention, about 30 seconds or so big portions in 4 minutes 1 processes of backwash
Divide VOCs that can be detached from from concentration and separation device desorption, and 30-40 times of concentration can be carried out.Therefore, the dioxy of detection is utilized
Change the average carbon density in the full width at half maximum (FWHM) time of carbon crest value and the average carbon density of generation, a variety of nytrons can be calculated
Surface concentration rate=A/B of object, as a result as shown in 2 each hydrocarbon surface concentration rate of table.
A is the average carbon density in the full width at half maximum (FWHM) time；B is the average carbon density generated.
Table 1
Table 2
In conclusion using the measurement device of NDIR method in the related technology, discharged mainly for volatile organic compounds
The shop equipment in source is measured, and measure object and measurement range have larger limitation, and are had using the volatility of NDIR method
Machine compound determination device is in the case where concentration is low, sensitivity decrease, accuracy needed for measurement is not achieved.
Although FID method can measure the volatile organic matter of low concentration, oxygen containing hydrocarbon is not measured, therefore
Whole content cannot be held.
PID method can only measure specific volatile organic compounds, have selectivity to measure object.
The embodiment of the present invention has the volatility of low concentration by the way of concentration and separation when solving problems above
Machine compound carries out efficient absorption concentration, to reach the measurement range of NDIR method, and is suitable for measuring the OVOC of low concentration, real
The purpose that Accurate Determining is carried out to the volatile organic compounds in ambient air is showed, in addition VOC measurement device fortune of the present invention
Row is stablized, high resolution, can carry out continuous on-line automatic measurement, and can carry out automatic sensitivity confirmation, installation cost is low
And it is easy to maintain.
It can be seen from the above, the key point and feature of the embodiment of the present invention are as follows:
1) embodiment of the present invention has Desorption separation promotion division, heats to concentration and separation device, volatility is promoted to have
Machine compound from concentration and separation device Desorption separation.
2) embodiment of the present invention has cooling end, can cool down to concentration and separation device, shorten and start to measure next time
Time, improve measurement frequency.
3) embodiment of the present invention has zero gas generating unit, can remove carbon dioxide and moisture in acquisition atmosphere, to produce
Raw zero gas, cleans apparatus of the present invention flow path, and available zero gas is measured confirmation to apparatus of the present invention and zero is true
Recognize.
4) embodiment of the present invention has the function of automatic sensitivity confirmation, the time and frequency that settable automatic sensitivity confirmation starts
It is secondary, while can according to need the correction coefficient that instrument whether is changed after setting sensitivity confirms, to ensure that apparatus of the present invention measure
Precision.
It should be noted that the explanation of the aforementioned sensing equipment embodiment to volatile organic compounds is also applied for
The measuring method of the embodiment, details are not described herein again.
The volatile organic compounds measuring method proposed according to embodiments of the present invention, by being surveyed according to NDIR method
It is fixed, can be with the low concentration VOCs in determination of the environment atmosphere, while the fast desorption of VOCs can be promoted to separate using heater, with
Determination efficiency is improved, zero gas can be generated in portion in the device, imports zero gas without external, and dehumidification device can effectively remove flow path
In moisture, guarantee flow path and zero gas cleaning, to improve sensitivity and the precision of measurement.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means particular features, structures, materials, or characteristics described in conjunction with this embodiment or example
It is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms need not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
It can be combined in any suitable manner in a or multiple embodiment or examples.In addition, without conflicting with each other, the technology of this field
The feature of different embodiments or examples described in this specification and different embodiments or examples can be combined by personnel
And combination.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (9)
1. a kind of volatile organic compounds measurement device characterized by comprising
Acquisition device, for acquiring ambient air；
It is concentrated and separated device, the volatile organic compounds for containing in ambient air described in Adsorption Concentration；
Desorption separation device, for the volatile organic compounds Desorption separation of the thickening apparatus will to be adsorbed on；
Reforming unit, the volatile organic compounds for going out Desorption separation are converted into two by the oxidation of catalyst
Carbonoxide；And
Analytical equipment, for obtaining the content of the carbon dioxide by on-dispersive type infrared absorption, and according to described two
The content of carbonoxide obtains carbon content, to obtain the content of the volatile organic compounds.
2. volatile organic compounds measurement device according to claim 1, which is characterized in that the acquisition device packet
It includes:
Filter, for the particulate matter in filtered atmospheric.
3. volatile organic compounds measurement device according to claim 1, which is characterized in that the concentration and separation device
Specifically for the volatile organic compounds being concentrated in atmosphere simultaneously and the volatile organic compounds being concentrated is separated,
The concentration and separation device is filled with adsorbent and porous polymer, with volatile organic compounds described in adsorption sampling.
4. volatile organic compounds measurement device according to claim 1, which is characterized in that the Desorption separation device
Include:
Heater, for promoting the fast desorption of the volatile organic compounds to separate；
Cooling fan, for promoting the fast cooling in concentration and separation portion；
Mass flow control appts, for controlling the flow in instrument flow path within a preset range；
Air pump, for being drawn the ambient air.
5. volatile organic compounds measurement device according to claim 1, which is characterized in that the reforming unit packet
It includes:
First converting apparatus is filled with oxidation catalyst in the first conversion component, so that described in the ambient air is waved
Hair property oxidation of organic compounds generates the carbon dioxide；
Absorption unit of dioxide carbon, for absorbing the carbon dioxide for removing first converting apparatus and generating；
First semi-permeable membrane dehumidifier removes the absorption unit of dioxide carbon stream for absorbing the moisture in the ambient air
The moisture in gas is out to obtain zero gas；
Second converting apparatus, for by by it is described concentration and separation device outflow volatile organic compounds carry out oxidation and/or
Heating, to generate carbon dioxide；
Second semi-permeable membrane dehumidifier, for removing the moisture of eluting gas in second converting apparatus.
6. volatile organic compounds measurement device according to claim 5, which is characterized in that zero gas is to pass through institute
It states absorption unit of dioxide carbon and the first semi-permeable membrane dehumidifier collective effect gets.
7. volatile organic compounds measurement device according to claim 1, which is characterized in that the analytical equipment is
NDIR measures analytical equipment.
8. a kind of volatile organic compounds measuring method, which comprises the following steps:
Acquire ambient air；
The volatile organic compounds contained in ambient air described in Adsorption Concentration；
By the volatile organic compounds Desorption separation of absorption；
Carbon dioxide is converted by the oxidation of catalyst by the volatile organic compounds that Desorption separation goes out；And
The content of the carbon dioxide is obtained by on-dispersive type infrared absorption, and is measured according to containing for the carbon dioxide
To carbon content, to obtain the content of the volatile organic compounds.
9. volatile organic compounds measuring method according to claim 8, which is characterized in that described in the Adsorption Concentration
The volatile organic compounds contained in ambient air further comprises:
The volatile organic compounds of the volatile organic compounds in atmosphere and separation concentration is concentrated, simultaneously to inhale
The attached sampling volatile organic compounds.
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Application publication date: 20190115 |
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| RJ01 | Rejection of invention patent application after publication |