CN108627369A - Atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates sampling system and method - Google Patents
Atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates sampling system and method Download PDFInfo
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- CN108627369A CN108627369A CN201710165381.2A CN201710165381A CN108627369A CN 108627369 A CN108627369 A CN 108627369A CN 201710165381 A CN201710165381 A CN 201710165381A CN 108627369 A CN108627369 A CN 108627369A
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- 238000001816 cooling Methods 0.000 title claims abstract description 62
- 238000005070 sampling Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 39
- 238000004094 preconcentration Methods 0.000 title claims abstract description 33
- 239000012141 concentrate Substances 0.000 title claims description 19
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims abstract description 28
- 238000004321 preservation Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 239000005416 organic matter Substances 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims description 121
- 230000008569 process Effects 0.000 claims description 30
- 238000010926 purge Methods 0.000 claims description 30
- 239000002184 metal Substances 0.000 claims description 23
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 229920000742 Cotton Polymers 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 210000002445 nipple Anatomy 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 3
- 238000002309 gasification Methods 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000000642 dynamic headspace extraction Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 239000000926 atmospheric chemistry Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000005436 troposphere Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- 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
- G01N1/40—Concentrating samples
- G01N1/4022—Concentrating samples by thermal techniques; Phase changes
-
- 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
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a kind of atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentration sampling system and methods.Atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentration sampling system includes double-channel gas trapping system, twin-stage deep cooling concentration systems, on-line sample analysis system, super rapid heating circuit system, heat preservation note sample air-channel system and reverse blow air-channel system.The twin-stage deep cooling concentration systems have deep cooling cavity；The double-channel gas trapping system includes two gas trapping channels, can switch capturing volatile organic matter.There is heat preservation note sample air-channel system sample injection sample introduction pipeline, two second level trap tubes can be switched and be connected to institute sample injection sample introduction pipeline, and sample injection sample introduction pipeline is connected to the on-line sample analysis system；Super rapid heating circuit system is used to control first order trap tube, second level trap tube into trip temperature；Reverse blow air-channel system is used for purge and trap pipe.The system disclosure satisfy that live on-line checking demand.
Description
Technical field
The present invention relates to gases to be enriched with field, more particularly to a kind of atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration
Concentrate sampling system and method.
Background technology
Volatile organic matter is prevalent in air, is the pass for generating troposphere atmospheric ozone and secondary organic aerosol
Key precursor can cause Atmospheric Photochemical Smog to generate, and Health cost is generated to animals and plants；Also human body can be directly entered and generate danger
Evil.The current atmospheric volatile organic compounds method of sampling is mainly sampled with adsorbent offline, and reusable heat desorption instrument is desorbed
Sample introduction.But adsorbent sampling always exists absorption and desorption efficiency to component, and time efficiency is low, and this method is only
Sampling and sample introduction offline can be carried out, live on-line checking demand and Atmospheric Chemistry change procedure research needs are cannot be satisfied.
Invention content
Based on this, it is necessary to it is deep to provide a kind of atmospheric volatile organic compounds twin-stage disclosure satisfy that live on-line checking demand
Cold on-line preconcentration concentration sampling system and method.
A kind of atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentration sampling system, including double-channel gas trapping system
System, acquisition system, twin-stage deep cooling concentration systems, on-line sample analysis system, super rapid heating circuit system, heat preservation note sample gas circuit
System and reverse blow air-channel system；The twin-stage deep cooling concentration systems have deep cooling cavity；
The acquisition system has the multidigit switching multiple-way valve being sequentially communicated, mass flow control meter, sampling pump and gas
Body outlet pipeline；
The double-channel gas trapping system includes two-bit triplet solenoid valve, multidigit switch sampling valve, three sample introduction gases
Entrance pipe and two gas trapping channels；Three sample introduction gas inlet lines respectively with the multidigit switch sampling valve
Connection is to be respectively used to be passed through atmospheric sample, external sample and internal standard sample；Each gas trapping channel all have according to
The second level trap tube of the secondary first order trap tube being linked in sequence, second level trap tube, two gas trapping channels is in parallel
It is communicated in the multidigit switching multiple-way valve；Two first order trap tubes are separately connected there are one the two-bit triplet electromagnetism
Valve, two two-bit triplet solenoid valves are connected separately with gas discharge outlet pipeline, two two-bit triplet solenoid valves commonly through
Another described two-bit triplet solenoid valve is connect with the multidigit switch sampling valve to realize two gas trapping channels
Switching；The first order trap tube and the second level trap tube are located in the deep cooling cavity；
There is the heat preservation note sample air-channel system sample injection sample introduction pipeline, the sample injection sample introduction pipeline to be communicated in institute
Multidigit switching multiple-way valve is stated, the sample injection sample introduction pipeline is connected to the on-line sample analysis system；The multidigit switching
Multiple-way valve can realize that first second level trap tube and the mass flow control meter are connected to and second described second
Grade trap tube and the sample injection sample introduction pipeline connection or second second level trap tube and the mass flow control
The connection of system meter and first second level trap tube and the sample injection sample introduction pipeline connection；
The super rapid heating circuit system has METAL HEATING PROCESS casing, the first temperature sensor and temperature adjustable electricity
The outside of road, the first order trap tube and the second level trap tube is arranged with the METAL HEATING PROCESS casing, Ge Gesuo
It states and is equipped with the first temperature sensor in METAL HEATING PROCESS casing, the temperature adjustable circuit is connected to the first order trap tube
And the second level trap tube is for controlling the first order trap tube and the second level trap tube into trip temperature；
The reverse blow air-channel system includes purge gas entrance pipe, and the purge gas entrance pipe can be distinguished
With two second level trap tube Opposite direction connections.
Also there is the heat preservation note sample air-channel system immerging metal tube heater and second temperature to pass in one of the embodiments,
Sensor, the immerging metal tube heater are set in the outside of the sample injection sample introduction pipeline, and the second temperature sensor is located at institute
It states in immerging metal tube heater.
Also there is the heat preservation note sample air-channel system insulating layer, the insulating layer to be wrapped in one of the embodiments,
The outside of the immerging metal tube heater.
The sample injection sample introduction pipeline is connected towards one end of the second level trap tube in one of the embodiments,
There are one two-bit triplet solenoid valve, the sample injection sample introduction pipeline passes through the two-bit triplet solenoid valve and corresponding described second
Grade trap tube connection.
It in the first order trap tube and all has stationary phase in one of the embodiments, in the trap tube of the second level and fills out
Material.
The twin-stage deep cooling concentration systems are also with no dead volume seal nipple in one of the embodiments, and described
By the no dead volume seal nipple, the two-bit triplet is electric accordingly for level-one trap tube and the second level trap tube
Magnet valve connects.
Also there is the twin-stage deep cooling concentration systems heat-preservation cotton layer, the heat-preservation cotton layer to set in one of the embodiments,
On the inner wall of deep cooling cavity, the thickness of the heat-preservation cotton layer is 60mm.
The reverse blow air-channel system further includes two-bit triplet solenoid valve in one of the embodiments, this two three
The entrance of three-way electromagnetic valve is connect with the purge gas entrance pipe, two of two-bit triplet solenoid valve outlets respectively with two
Second level trap tube Opposite direction connection.
A kind of atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentration method of sampling, includes the following steps：
Gaseous sample traps process：One of double-channel gas trapping system gas trapping channel is selected to carry out gas
Sample traps, gas trapping channel spacing trapping and once total cleaning cycle is caught equal to another gas in the gas trapping channel
Collect an analytical cycle in channel, the first order trap tube and the second level during the gas trapping in the gas trapping channel are caught
Collector is in subzero 160 DEG C, and gaseous sample enters described the by sample introduction gas inlet line and multidigit switch sampling valve
In level-one trap tube, the first order trap tube is realized freezes richness to the first time of the volatile organic matter in the gaseous sample
Collection；
Secondary focusing process：After completing freezing enrichment of the gaseous sample in first order trap tube, the gas trapping
The first order trap tube temperature in channel is increased to subzero 15 DEG C with 50 DEG C of speed per second, while the gas trapping channel
The second level trap tube temperature is maintained at subzero 160 DEG C, and volatile organic matter is gasified totally and enters the second level and is caught
In collector, the moisture content of the gaseous sample remains in first order trap tube, realizes poly- to the time condensation of volatile organic matter
It is burnt；
Parse sample introduction process：The second level trap tube temperature in the gas trapping channel is quickly risen with 100 DEG C of speed per second
Up to 150 DEG C or 150 DEG C or more of temperature, by the supper-fast gasification of the volatile organic matter in the second level trap tube, and
Entered by heat preservation note sample air-channel system and carries out on-line analysis in on-line sample analysis system；
Reverse blow process：By the institute of the purge gas entrance pipe of reverse blow air-channel system and the gas trapping channel
Second level trap tube connection is stated, the second level trap tube and the first order are trapped by the purge gas entrance pipe
Purge gas is passed through in pipe, the first order trap tube and the second level trap tube are heated to 200 DEG C or more, by blowing
Scavenging body purges the residue in the first order trap tube and the second level trap tube by gas discharge outlet pipeline
It goes out；
Cool down standby：Close purge gas entrance pipe, the first order trap tube in the gas trapping channel, institute
It states second level trap tube and is cooled to subzero 160 DEG C, it is for use when for next cycle trapping sample；
Switching channel sampling process：The gaseous sample that a cycle is completed in above-mentioned gas trapping channel traps and starts two
When secondary focusing, another gas trapping channel proceeds by the gaseous sample trapping process of next cycle, and so on,
Until gaseous sample trapping terminates.
The purge gas is nitrogen, dry air or helium in one of the embodiments,.
Above-mentioned atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates sampling system, uses double-channel gas and catches
Collecting system, twin-stage deep cooling concentration systems, wherein gas trapping channel carry out gaseous sample trapping process, secondary focusing mistake
After journey, parsing sample introduction process, reverse blow process, cooling standby, and when carrying out the secondary focusing process of next cycle,
Another gas trapping channel can be carried out at the same time gaseous sample trapping process, and so on, double-channel gas trapping system is true
Guarantor fully traps volatile organic matter, improves the arresting efficiency of atmospheric volatile organic compounds.Above-mentioned air volatilization
Property organic matter twin-stage deep cooling on-line preconcentration concentration sampling system can be combined with volatile organic matter detecting instrument, to realization environment
Real-time, the on-line checking of volatile organic trace compounds have great importance in air, which can be effectively to atmospheric volatile
Organic matter is adsorbed and is enriched with, efficiently quickly pollution-free without discrimination, and sample introduction can be combined online with on-line checking instrument,
Realize the on-line analysis in situ to atmospheric volatile organic compounds.
Description of the drawings
Fig. 1 is the gas trapping mistake that an embodiment atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates sampling system
Journey principle schematic；
Fig. 2 is the secondary focusing mistake that atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates sampling system shown in Fig. 1
Journey principle schematic；
Fig. 3 is the parsing sample introduction mistake that atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates sampling system shown in Fig. 1
Journey principle schematic；
Fig. 4 is the analysis blowback that atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates sampling system shown in Fig. 1
Journey principle schematic；
Fig. 5 is the standby mistake of cooling that atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates sampling system shown in Fig. 1
Journey principle schematic.
Reference sign
10, atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates sampling system；100, double-channel gas trapping system
System；110, two-bit triplet solenoid valve；120, multidigit switch sampling valve；131,132,133, sample introduction gas inlet line；140, gas
Body traps channel；141, first order trap tube；142, second level trap tube；200, acquisition system；210, mass flow control meter；
220, sampling pump；230, gas discharge outlet pipeline；300, deep cooling cavity；400, on-line sample analysis system；500, supper-fast to add
Heater circuit system；510, METAL HEATING PROCESS casing；520, the first temperature sensor；600, heat preservation note sample air-channel system；610, sample
Sample injection pipeline；620, immerging metal tube heater；630, second temperature sensor；700, purge gas entrance pipe.
Specific implementation mode
To facilitate the understanding of the present invention, below with reference to relevant drawings to invention is more fully described.In attached drawing
Give presently preferred embodiments of the present invention.But the present invention can realize in many different forms, however it is not limited to this paper institutes
The embodiment of description.Keep the understanding to the disclosure more thorough on the contrary, purpose of providing these embodiments is
Comprehensively.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.
Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the present invention
The normally understood meaning of technical staff is identical.Used term is intended merely to description tool in the description of the invention herein
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more phases
Any and all combinations of the Listed Items of pass.
Shown in Figure 1, the present embodiment relates to a kind of concentration of atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration and adopts
Sample system 10.It includes double-channel gas trapping system that the atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration, which concentrates sampling system 10,
System 100, acquisition system 200, twin-stage deep cooling concentration systems, on-line sample analysis system 400, super rapid heating circuit system 500,
Heat preservation note sample air-channel system 600 and reverse blow air-channel system.
Shown in Figure 1, the acquisition system 200 has the multidigit switching multiple-way valve being sequentially communicated, mass flow control
Meter 210, sampling pump 220 and gas discharge outlet pipeline 230.
Shown in Figure 1, the double-channel gas trapping system 100 is switched into including two-bit triplet solenoid valve 110, multidigit
120, three sample introduction gas inlet lines 131,132,133 of sample valve and two gas trapping channels 140.Three sample introduction gas
Body entrance pipe 131,132,133 is connect respectively with the multidigit switch sampling valve 120 to be respectively used to be passed through atmospheric sample, outer
Standard specimen product and internal standard sample, for atmospheric sample for being passed through atmospheric volatile organic compounds, external sample, internal standard sample are such as passed through mark
Quasi- sample is for specified value curve.The gas trapping channel 140 has the first order trap tube being linked in sequence successively
141, second level trap tube 142.Two 142 parallel communications of second level trap tube switch multiple-way valve in the multidigit.First
Grade trap tube 141, second level trap tube 142 are all made of special metal pipe-wall material and are made, size adjustable, it is ensured that volatility
Organic matter is fully trapped.Fixed phase stuffing is all had in the first order trap tube and in the trap tube of the second level.
Shown in Fig. 1 and Fig. 2, two first order trap tubes 141 be separately connected there are one the two-bit triplet electricity
Magnet valve 110, two two-bit triplet solenoid valves 110 are connected separately with gas discharge outlet pipeline 230, two two-bit triplet electromagnetism
Valve 110 is connect with the multidigit switch sampling valve 120 to realize two commonly through two-bit triplet solenoid valve 110 described in another
The switching in the gas trapping channel 140.
Shown in Fig. 1 and Fig. 2, the twin-stage deep cooling concentration systems have deep cooling cavity 300.The twin-stage deep cooling concentration
System is also with no dead volume seal nipple.The first order trap tube 141 and the second level trap tube 142 are located at described
In deep cooling cavity 300.The first order trap tube 141 and the second level trap tube 142 are close by the no dead volume
The two-bit triplet solenoid valve 110 connects sealing joint accordingly.The twin-stage deep cooling concentration systems also have heat-preservation cotton layer (attached drawing
In be not shown).The heat-preservation cotton layer is located on the inner wall of deep cooling cavity 300, and the thickness of the heat-preservation cotton layer is 60mm.
Shown in Fig. 1-Fig. 3, the heat preservation note sample air-channel system 600 has sample injection sample introduction pipeline 610.The sample
Product sample injection pipeline 610 is connected to switches multiple-way valve, the sample injection sample introduction pipeline 610 and the online sample with the multidigit
Product analysis system 400 is connected to.The multidigit switching multiple-way valve can realize first second level trap tube and the quality
Flow control meter 210 is connected to and second second level trap tube is connected to the sample injection sample introduction pipeline 610, Huo Zhe
Two second level trap tubes and the mass flow control meter 210 be connected to and first second level trap tube with it is described
Sample injection sample introduction pipeline 610 is connected to.
Shown in Fig. 1-Fig. 3, further, the sample injection sample introduction pipeline 610 is towards the second level trap tube
There are one two-bit triplet solenoid valve 110, the sample injection sample introduction pipelines 610 to pass through two-bit triplet electricity for 142 one end connection
Magnet valve 110 is connected with the corresponding second level trap tube 142.
Shown in Fig. 1-Fig. 3, further, heat preservation note sample air-channel system 600 also have immerging metal tube heater 620 with
And second temperature sensor 630.The immerging metal tube heater 620 is set in the outside of the sample injection sample introduction pipeline 610, described
Second temperature sensor 630 is located in the immerging metal tube heater 620.
Further, also there is the heat preservation note sample air-channel system 600 insulating layer, the insulating layer to be wrapped in the metal
The outside of heating tube 620.
Shown in Fig. 1-Fig. 3, the super rapid heating circuit system 500 has METAL HEATING PROCESS casing 510, the first temperature
Sensor 520 and temperature adjustable circuit.The outside of the first order trap tube 141 and the second level trap tube 142
It is arranged with the METAL HEATING PROCESS casing 510.It is equipped with the first temperature sensor 520 in each METAL HEATING PROCESS casing 510.
The temperature adjustable circuit is connected to the first order trap tube 141 and the second level trap tube 142 for institute
First order trap tube 141 and the second level trap tube 142 is stated to control into trip temperature.
Shown in Fig. 1-Fig. 3, the reverse blow air-channel system includes purge gas entrance pipe 700.The purging
Gas inlet line 700 can respectively with two 142 Opposite direction connections of second level trap tube.Further, the reverse blow gas
Road system further includes two-bit triplet solenoid valve 110, the entrance of the two-bit triplet solenoid valve 110 and the purge gas entrance pipe
700 connections, two of the two-bit triplet solenoid valve 110 outlets respectively with two 142 Opposite direction connections of second level trap tube.It is described to blow
It sweeps and is passed through nitrogen, dry air or helium in gas inlet line 700.Specifically, in the present embodiment, purge gass are nitrogen.
The atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration that the present embodiment is related to concentrates sampling system 10, is using
When, relate to a kind of atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentration method of sampling.
Shown in Fig. 1-Fig. 5, a kind of atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentration method of sampling, including
Following steps：
Shown in Figure 1, gaseous sample traps process：Select one of double-channel gas trapping system 100 gas
It traps channel 140 and carries out gaseous sample trapping, the gas trapping channel 140 interval traps and the gas trapping channel 140 is primary
Total cleaning cycle is equal to an analytical cycle in another gas trapping channel 140, the gas trapping in the gas trapping channel 140
First order trap tube 141 and second level trap tube 142 in the process is in subzero 160 DEG C, and gaseous sample passes through sample introduction gas
Body entrance pipe 131,132,133 and multidigit switch sampling valve 120 enter in the first order trap tube 141, and described first
Grade trap tube 141 is realized freezes enrichment to the first time of the volatile organic matter in the gaseous sample.
It is shown in Figure 2, secondary focusing process：It is rich to complete freezing of the gaseous sample in first order trap tube 141
After collection, 141 temperature of first order trap tube in the gas trapping channel 140 is increased to subzero 15 with 50 DEG C of speed per second
DEG C, while 142 temperature of second level trap tube in the gas trapping channel 140 is maintained at subzero 160 DEG C, volatility is organic
Object is gasified totally and enters in the second level trap tube 142, and the moisture content of the gaseous sample remains in first order trap tube 141
In, it realizes and the time condensation of volatile organic matter is focused.
It is shown in Figure 3, parse sample introduction process：142 temperature of second level trap tube in the gas trapping channel 140 is with 100
DEG C speed per second is quickly increased to 150 DEG C or 150 DEG C or more of temperature, by the volatility in the second level trap tube 142
The supper-fast gasification of organic matter, and entered in on-line sample analysis system 400 by heat preservation note sample air-channel system 600 and carried out online
Analysis.The workflow parameters of 400 control system of on-line sample analysis system are exported with data result.
It is shown in Figure 4, reverse blow process：By the purge gas entrance pipe 700 of reverse blow air-channel system and it is somebody's turn to do
The second level trap tube 142 in gas trapping channel 140 connects, by the purge gas entrance pipe 700 to this second
It is passed through purge gas in grade trap tube 142 and the first order trap tube 141, the first order trap tube 141 and described
Second level trap tube 142 is heated to 200 DEG C or more, by purge gas by the first order trap tube 141 and described
Residue in two level trap tube 142 by gas discharge outlet pipeline 230 purge away.
Shown in Figure 5, cool down standby：Purge gas entrance pipe 700 is closed, the gas trapping channel 140
The first order trap tube 141, the second level trap tube 142 are cooled to subzero 160 DEG C, so that next cycle traps sample
When it is for use.
Switching channel sampling process：The gaseous sample that a cycle is completed in above-mentioned gas trapping channel 140 is trapped and is opened
When beginning secondary focusing process, another gas trapping channel 140 proceeds by the gaseous sample trapping process of next cycle, with
This analogizes, until gaseous sample trapping terminates.
Above-mentioned atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates sampling system 10, uses double-channel gas
Trapping system 100, twin-stage deep cooling concentration systems, wherein gas trapping channel 140 carry out gaseous sample trapping process, two
After secondary focusing, parsing sample introduction process, reverse blow process, cooling standby, and carry out the secondary poly- of next cycle
When burnt process, another gas trapping channel 140 can be carried out at the same time gaseous sample trapping process, and so on, binary channels gas
Body trapping system 100 ensures fully to trap volatile organic matter, improves the arresting efficiency of atmospheric volatile organic compounds.
Above-mentioned atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentration sampling system 10 can be with volatile organic matter detector
Device is combined, to realizing that real-time, the on-line checking of volatile organic trace compounds in surrounding air have great importance, the system energy
Effectively atmospheric volatile organic compounds are adsorbed and are enriched with, efficiently quickly pollution-free without discrimination, and can online sample introduction with
On-line checking instrument is combined, and realizes the on-line analysis in situ to atmospheric volatile organic compounds.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates sampling system, which is characterized in that including binary channels
Gas capture system, twin-stage deep cooling concentration systems, on-line sample analysis system, super rapid heating circuit system, is protected at acquisition system
Temperature note sample air-channel system and reverse blow air-channel system；The twin-stage deep cooling concentration systems have deep cooling cavity；
The acquisition system has the multidigit switching multiple-way valve being sequentially communicated, mass flow control meter, sampling pump and gas row
Export pipeline；
The double-channel gas trapping system includes two-bit triplet solenoid valve, multidigit switch sampling valve, three sample introduction gas accesses
Pipeline and two gas trapping channels；Three sample introduction gas inlet lines are connect with the multidigit switch sampling valve respectively
To be respectively used to be passed through atmospheric sample, external sample and internal standard sample；Each gas trapping channel all has suitable successively
First order trap tube, the second level trap tube of sequence connection, the second level trap tube parallel communication in two gas trapping channels
Switch multiple-way valve in the multidigit；Two first order trap tubes are separately connected there are one the two-bit triplet solenoid valve, should
Two two-bit triplet solenoid valves are connected separately with gas discharge outlet pipeline, and two two-bit triplet solenoid valves are commonly through another
The two-bit triplet solenoid valve is connect with the multidigit switch sampling valve to realize the switching in two gas trapping channels；Institute
It states first order trap tube and the second level trap tube is located in the deep cooling cavity；
The heat preservation note sample air-channel system has sample injection sample introduction pipeline, and the sample injection sample introduction pipeline is communicated in described more
Position switching multiple-way valve, the sample injection sample introduction pipeline are connected to the on-line sample analysis system；The multidigit switching is mostly logical
Valve can realize that first second level trap tube is connected to mass flow control meter and second second level is caught
Collector is counted with the sample injection sample introduction pipeline connection or second second level trap tube with mass flow control
Connection and first second level trap tube and the sample injection sample introduction pipeline connection；
The super rapid heating circuit system has METAL HEATING PROCESS casing, the first temperature sensor and temperature adjustable circuit,
The outside of the first order trap tube and the second level trap tube is arranged with the METAL HEATING PROCESS casing, each gold
Belong in heating muff and be equipped with the first temperature sensor, the temperature adjustable circuit be connected to the first order trap tube and
The second level trap tube is for controlling the first order trap tube and the second level trap tube into trip temperature；
The reverse blow air-channel system includes purge gas entrance pipe, and the purge gas entrance pipe can be respectively with two
A second level trap tube Opposite direction connection.
2. atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration according to claim 1 concentrates sampling system, feature
It is, the heat preservation note sample air-channel system also has immerging metal tube heater and second temperature sensor, the METAL HEATING PROCESS pipe sleeve
It is located at the outside of the sample injection sample introduction pipeline, the second temperature sensor is located in the immerging metal tube heater.
3. atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration according to claim 2 concentrates sampling system, feature
It is, also there is the heat preservation note sample air-channel system insulating layer, the insulating layer to be wrapped in the outside of the immerging metal tube heater.
4. atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration according to claim 2 concentrates sampling system, feature
It is, the sample injection sample introduction pipeline is also connected towards one end of the second level trap tube there are one two-bit triplet electromagnetism
Valve, the sample injection sample introduction pipeline are connected by the two-bit triplet solenoid valve with the corresponding second level trap tube.
5. atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentration sampling system according to any one of claims 1-4
System, which is characterized in that all have fixed phase stuffing in the first order trap tube and in the trap tube of the second level.
6. atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentration sampling system according to any one of claims 1-4
System, which is characterized in that the twin-stage deep cooling concentration systems also with no dead volume seal nipple, the first order trap tube and
By the no dead volume seal nipple, the two-bit triplet solenoid valve connects the second level trap tube accordingly.
7. atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentration sampling system according to any one of claims 1-4
System, which is characterized in that also there is the twin-stage deep cooling concentration systems heat-preservation cotton layer, the heat-preservation cotton layer to be located at the interior of deep cooling cavity
On wall, the thickness of the heat-preservation cotton layer is 60mm.
8. atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentration sampling system according to any one of claims 1-4
System, which is characterized in that the reverse blow air-channel system further includes two-bit triplet solenoid valve, the entrance of the two-bit triplet solenoid valve
It is connect with the purge gas entrance pipe, two outlets of the two-bit triplet solenoid valve are anti-with two second level trap tubes respectively
To connection.
9. a kind of atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration concentrates the method for sampling, which is characterized in that including walking as follows
Suddenly：
Gaseous sample traps process：One of double-channel gas trapping system gas trapping channel is selected to carry out gaseous sample
Once total cleaning cycle is logical equal to another gas trapping for trapping, gas trapping channel spacing trapping and the gas trapping channel
Analytical cycle in road, the first order trap tube during the gas trapping in the gas trapping channel and second level trap tube
Subzero 160 DEG C are in, gaseous sample enters the first order by sample introduction gas inlet line and multidigit switch sampling valve
In trap tube, the first order trap tube is realized freezes enrichment to the first time of the volatile organic matter in the gaseous sample；
Secondary focusing process：After completing freezing enrichment of the gaseous sample in first order trap tube, the gas trapping channel
The first order trap tube temperature be increased to subzero 15 DEG C with 50 DEG C of speed per second, while the gas trapping channel is described
Second level trap tube temperature is maintained at subzero 160 DEG C, and volatile organic matter is gasified totally and enters the second level trap tube
In, the moisture content of the gaseous sample remains in first order trap tube, realizes and is focused to the time condensation of volatile organic matter；
Parse sample introduction process：The second level trap tube temperature in the gas trapping channel is quickly increased to 100 DEG C of speed per second
150 DEG C or 150 DEG C or more of temperature by the supper-fast gasification of the volatile organic matter in the second level trap tube, and passes through
Heat preservation note sample air-channel system, which enters, carries out on-line analysis in on-line sample analysis system；
Reverse blow process：By described the of the purge gas entrance pipe of reverse blow air-channel system and the gas trapping channel
Two level trap tube connects, by the purge gas entrance pipe in the second level trap tube and the first order trap tube
It is passed through purge gas, the first order trap tube and the second level trap tube are heated to 200 DEG C or more, pass through purge gass
Body purges away the residue in the first order trap tube and the second level trap tube by gas discharge outlet pipeline；
Cool down standby：Close purge gas entrance pipe, the first order trap tube in the gas trapping channel, described the
Two level trap tube is cooled to subzero 160 DEG C, for use when for next cycle trapping sample；
Switching channel sampling process：The gaseous sample that a cycle is completed in above-mentioned gas trapping channel traps and starts secondary poly-
Jiao Shi, another gas trapping channel proceed by the gaseous sample trapping process of next cycle, and so on, until gas
Sample trapping terminates.
10. atmospheric volatile organic compounds twin-stage deep cooling on-line preconcentration according to claim 9 concentrates the method for sampling, feature
It is, the purge gas is nitrogen, dry air or helium.
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