CN110261503A - A kind of VOCs gas detection method and device - Google Patents
A kind of VOCs gas detection method and device Download PDFInfo
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- CN110261503A CN110261503A CN201910542373.4A CN201910542373A CN110261503A CN 110261503 A CN110261503 A CN 110261503A CN 201910542373 A CN201910542373 A CN 201910542373A CN 110261503 A CN110261503 A CN 110261503A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
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- G01N30/64—Electrical detectors
- G01N30/68—Flame ionisation detectors
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Abstract
A kind of VOCs analysis method for gases of this reality disclosure of the invention, can effectively detect the total hydrocarbon in air, methane and benzene homologues, and this law method is specifically included according to the first chromatography rule, carry out the first separating treatment to sample, obtain total hydrocarbon and non-total hydrocarbon；First FID detection method is used to total hydrocarbon, obtains the content of the total hydrocarbon；According to the second chromatography rule, the second separating treatment is carried out to total hydrocarbon, obtains methane and non-methane sample；2nd FID detection method is used to the methane, obtains the content of the methane；According to third chromatography rule, third separating treatment is carried out to non-methane sample, obtains benzene homologues and non-benzene homologues；3rd FID detection method is used to the benzene homologues, obtains the content of the benzene homologues.
Description
Technical field
Present invention relates particularly to Pollution Source Monitoring technical fields, further to a kind of VOCs gas detection method and dress
It sets.
Background technique
(VOCs, Volatile Organic Compounds) volatile organic matter, according to the definition of the World Health Organization
Boiling point is in 50 DEG C -250 DEG C of compound, and saturated vapor pressure is more than 133.32Pa at room temperature, exists in vapour form at normal temperature
A type organic in air.VOCs compound has Atmospheric Chemistry reactivity mostly, be photochemical fog it is important before
Extract, according to chemical property, VOCs divides aromatic hydrocarbon, aliphatic hydrocarbon, halogenated hydrocarbons, ester, aldehyde, ketone, eight class such as alcohol.VOCs's comes in atmosphere
Source is mainly industrial production, but recently as continuous improvement of people's living standards, the improvement of living conditions, and interior decoration is got over
Come it is more exquisite, human health damage caused by room air pollution report it is more and more, be increasingly becoming today's society concern
Focus.The source of indoor environmental pollution includes outdoor air pollution, building decoration materials, three sides of furniture and office appliance
Face.Indoor air quality variation partly cause is that outside atmosphere pollution is got worse, and interior decoration and a large amount of of finishing material make
With also indoor air quality being caused to deteriorate.The materials such as air-conditioning system and sound control glass being widely used indoors, makes room ventilation
It is restricted, further results in the continuous accumulation of VOCs.Related literatures shows that the mainstream of current country VOCs tests and analyzes
Method, only can 65 kinds of volatile organic matters in determination of the environment air.
People averagely have 80% or more time to spend indoors daily, compared with other pollutants, in Modern Family room
Organic pollution present in air is more universal, and crowd's exposure range is wide, and risk is big, the people stopped in this environment
Group, is easy to produce the short-term adverse reaction such as skin allergy, fatigue, drowsiness, dizziness.Long Term Contact VOCs exhales the skin to people
Desorption system and cardiovascular system cause great damage.The most common two pollutants matter be formaldehyde and benzene homologues they be recognized
To be high toxicity, causing a disease, carcinogenic toxic compounds.Formaldehyde is present in multiple building materials, it is that a kind of toxicity is very strong
Substance, human body are chronically in formaldehyde environment, can cause canceration or body distortion.Benzene homologues are prevalent in paint,
In the construction materials such as coating, blood constituent and cardiovascular system can be damaged, causes gastrointestinal disturbance, induces immune system, interior point
System and disease of hematopoietic system are secreted, causes metabolic deficiency, or even have carcinogenesis.The World Health Organization thinks, in room air
VOCs will lead to human body generate headache, nausea, fatigue, the symptoms such as red swelling of the skin.
Currently, the most research method and monitoring technology about indoor VOCs are single, mostly (it is sampled as with Solid Phase Extraction
Capture by Sorbents)-gas chromatography (GC-MS analysis) research based on, existing GC-MS method can not accurately analyze the alkane of low carbon chain
Hydrocarbon, alkene, alkynes, the VOCs type measured is not complete enough, and this method sampling and analytic process are complicated, and analysis time is long, surveys
It measures at high cost.The mainstream determination method of current country VOCs, only can 65 kinds of volatile organic matters in determination of the environment air.By
It is extremely complex in VOCs ingredient, therefore single method is difficult to complete full-fledged research target, current VOCs monitoring technology quality assurance,
Quality Control Procedure still need to it is perfect, routine monitoring standard need unification.For quantitative study VOCs emission source to secondary pollution
The potentiality of generation are contributed, and need to consider loss of the VOCs in Atmospheric processes, because these losses are likely to be air pollution
Main contributions source, so that also just to analytical technology, more stringent requirements are proposed, including effectively control example enrichment system into
Sample amount, the design of water management system and low temperature acquisition modes of enrichment cold-trap etc..Solve the difficulty and meaning of above-mentioned technical problem
Justice: extremely complex in view of VOCs ingredient, the prior art can not detect trace VOCs type and concentration, so that TVOC testing result is inclined
Low, it is inadequate to will cause evaluation conclusion accuracy since data integrity is obviously insufficient for comparative evaluation's standard.
Summary of the invention
The present invention provides a kind of VOCs gas detection methods, for effectively to methane, benzene homologues and the total hydrocarbon in air
Content is detected.
VOCs gas detection method provided by the invention includes:
According to the first chromatography rule, the first separating treatment is carried out to sample, obtains total hydrocarbon and non-total hydrocarbon；
First FID detection method is used to total hydrocarbon, obtains the content of the total hydrocarbon；
According to the second chromatography rule, the second separating treatment is carried out to total hydrocarbon, obtains methane and non-methane sample；
2nd FID detection method is used to the methane, obtains the content of the methane；
According to third chromatography rule, third separating treatment is carried out to non-methane sample, obtains benzene homologues and non-benzene series
Object；
3rd FID detection method is used to the benzene homologues, obtains the content of the benzene homologues.
Optionally,
According to the second chromatography rule described in step, the second separating treatment is carried out to total hydrocarbon, obtains methane and non-methane
After sample, the 2nd FID detection method is used to the methane described in step, before obtaining the content of the methane further include:
According to the first hydro carbons blowback rule, the first reverse blowing disposal is carried out to the methane.
Optionally,
According to third chromatography rule described in step, third separating treatment is carried out to non-methane sample, obtains benzene homologues
After non-benzene homologues, described in step to the benzene homologues use the 3rd FID detection method, obtain the benzene homologues content it
Before further include:
According to the second hydro carbons blowback rule, the second reverse blowing disposal is carried out to the benzene homologues.
Optionally,
The 3rd FID detection method is used to the benzene homologues described in step, obtains the step before the content of the benzene homologues
Carrier gas in rapid is zero gas, uses the 3rd FID detection method to the benzene homologues described in step, obtains the content of the benzene homologues
Carrier gas be nitrogen.
Optionally,
The nitrogen gas purity is not less than 99.999%, and the nitrogen input pressure is not less than 0.4Mpa.
Optionally,
The first FID detection method is used to total hydrocarbon described in step, the content and step for obtaining the total hydrocarbon are to the first
Alkane uses the 2nd FID detection method, obtains the content of the methane, carries out in the first FID detection device；
The 3rd FID detection method is used to the benzene homologues described in step, the content of the benzene homologues is obtained, second
It is carried out in FID detection device.
Optionally,
When the methane enters six-way valve by the first ten-way valve, the first reverse blowing disposal is carried out to the methane.
Optionally,
When the benzene homologues enter the second ten-way valve by six-way valve, the second reverse blowing disposal is carried out to the benzene homologues.
The present invention also provides a kind of VOCs gas devices using above-mentioned VOCs gas detection method, specifically include:
First separative unit, for carrying out the first separating treatment to sample, obtaining total hydrocarbon according to the first chromatography rule
With non-total hydrocarbon；
First detection unit obtains the content of the total hydrocarbon for using the first FID detection method to total hydrocarbon；
Second separative unit, for carrying out the second separating treatment to total hydrocarbon, obtaining methane according to the second chromatography rule
With non-methane sample；
Second detection unit obtains the content of the methane for using the 2nd FID detection method to the methane；
Third separative unit, for carrying out third separating treatment to non-methane sample, obtaining according to third chromatography rule
To benzene homologues and non-benzene homologues；
Third detection unit obtains containing for the benzene homologues for using the 3rd FID detection method to the benzene homologues
Amount.
Optionally,
The first detection unit and the second detection unit integrated configuration are in the first FID detection device；
The third detection unit is configured in the 2nd FID detection device.
The present invention by by chromatography and FID detection method combination, effectively in air methane, non-methane total hydrocarbons and
Benzene homologues are separated, then are detected one by one, and obtain testing result.Compared with prior art, the time used is shorter, improves
Working efficiency.
Detailed description of the invention
Fig. 1 is the flow chart of VOCs detection method embodiment of the present invention；
Fig. 2 is the structure principle chart of VOCs detection device of the present invention；
Fig. 3 is the structural schematic diagram of VOCs detection device of the present invention.
Specific embodiment
The present invention provides a kind of VOCs gas detection methods, for effectively to methane, benzene homologues and the total hydrocarbon in air
Content is detected.
Referring to Fig. 1, VOCs gas detection method provided by the invention includes:
101, according to the first chromatography rule, the first separating treatment is carried out to sample, obtains total hydrocarbon and non-total hydrocarbon；
In the present embodiment, sample is divided into total hydrocarbon and non-total hydrocarbon using zero gas as carrier gas via chromatographic column, and total hydrocarbon is to have
Evil ingredient VOCs enters follow-up process processing, and non-total hydrocarbon is harmless components, is not processed, can be discharged or filter out, herein
It is not specifically limited.
102, the first FID detection method is used to total hydrocarbon, obtains the content of the total hydrocarbon；
In the present embodiment, (FID, flame ionization detector) flame ionization ditector, with hydrogen
Burning is the energy in air, and carrier gas (N2) carries analyzed component and combustible gas (H2) and enters inspection side device, combustion-supporting gas from nozzle
(air) is imported from surrounding, and tested component is dissociated into negative ions in flame, positive and negative in the electric field that polarizing voltage is formed
Ion is collected, exports to respectively opposite electrode movement, the ion stream of formation, and through impedance conversion, amplifier amplifies electric signal,
Just measurable electric signal is obtained.Since flame ionization ditector has very high sensitivity to most of organic compounds,
But to not ionizable inorganic compound without response, so being very suitable to the analysis of Trace Organic Gases in Atmosphere.
103, according to the second chromatography rule, the second separating treatment is carried out to total hydrocarbon, obtains methane and non-methane sample；
In the present embodiment, after the step, reverse blowing disposal is carried out in order to remove the hydrocarbon in methane.The processing exists
Occur in the chromatograph of switching valve, target components enter chromatographic column column, and non-target components is vented by drain.To play
The effect of noise reduction.
104, the 2nd FID detection method is used to the methane, obtains the content of the methane；
In the present embodiment, it should be noted that the first FID detection method is used to total hydrocarbon described in step, is obtained described
The content and step of total hydrocarbon use the 2nd FID detection method to the methane, the content of the methane are obtained, in the first FID
It is carried out in detection device.To effectively save program, equipment is effectively saved.
105, according to third chromatography rule, third separating treatment is carried out to non-methane sample, obtains benzene homologues and non-
Benzene homologues；
In the present embodiment, reverse blowing disposal is carried out to the benzene homologues, effect is consistent with aforementioned blowback Noise Reduction, does not do
It repeats.
106, the 3rd FID detection method is used to the benzene homologues, obtains the content of the benzene homologues.
In the present embodiment, the 3rd FID detection method is used to the benzene homologues described in step, obtains containing for the benzene homologues
Carrier gas in the step of before amount is zero gas, uses the 3rd FID detection method to the benzene homologues described in step, obtains the benzene
The carrier gas for being the content of object is nitrogen.
It should be noted that the nitrogen gas purity is not less than 99.999%, the nitrogen input pressure is not less than 0.4Mpa.
Optionally,
The first FID detection method is used to total hydrocarbon described in step, the content and step for obtaining the total hydrocarbon are to the first
Alkane uses the 2nd FID detection method, obtains the content of the methane, carries out in the first FID detection device；
The 3rd FID detection method is used to the benzene homologues described in step, the content of the benzene homologues is obtained, second
It is carried out in FID detection device.
Optionally,
When the methane enters six-way valve by the first ten-way valve, the first reverse blowing disposal is carried out to the methane.
Optionally,
When the benzene homologues enter the second ten-way valve by six-way valve, the second reverse blowing disposal is carried out to the benzene homologues.
The present embodiment has the advantages that compared with the existing technology:
1. using double fid detectors non-methane total hydrocarbons, methane and Benzene series Concentrations can be monitored simultaneously in the shortest time；
2. the analysis flow path of non-methane total hydrocarbons, as carrier gas, is reduced nitrogen usage amount, reduced with changing nitrogen using zero gas
The frequency；
3., when the moisture of hydrogen does not eliminate completely, to instrument, there is no too big shadows due to controlling flow using mechanical valve
It rings；
4. instrument automatic running after booting is not necessarily to human intervention, accomplishes real on-line checking.
Referring to Fig. 2, the present invention also provides a kind of VOCs gas device using above-mentioned VOCs gas detection method,
It specifically includes:
First separative unit 201, for carrying out the first separating treatment to sample, obtaining according to the first chromatography rule
Total hydrocarbon and non-total hydrocarbon；
First detection unit 202 obtains the content of the total hydrocarbon for using the first FID detection method to total hydrocarbon；
Second separative unit 203, for carrying out the second separating treatment to total hydrocarbon, obtaining according to the second chromatography rule
Methane and non-methane sample；
Second detection unit 204 obtains the content of the methane for using the 2nd FID detection method to the methane；
Third separative unit 205, for being carried out at third separation to non-methane sample according to third chromatography rule
Reason, obtains benzene homologues and non-benzene homologues；
Third detection unit 206 obtains the benzene homologues for using the 3rd FID detection method to the benzene homologues
Content.
It should be noted that the first detection unit 202 and 204 integrated configuration of the second detection unit are first
In FID detection device；
The third detection unit 206 is configured in the 2nd FID detection device.
Referring to Fig. 3, in practical application, the VOCs gas-detecting device in the present invention may include two ten-way valves, one
A six-way valve and two FID, two chromatographic columns and corresponding quantitative loop and pressure reducing valve.
In addition, being stored on the computer readable storage medium the present invention also provides a kind of computer readable storage medium
The step of realizing VOCs gas detection method as described above when having the execution of VOCs gas-detecting device.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or system.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in one as described above
In storage medium (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that terminal device (it can be mobile phone,
Computer, server or network equipment etc.) execute method described in each embodiment of the present invention.The above is only of the invention
Preferred embodiment is not intended to limit the scope of the invention, all using made by description of the invention and accompanying drawing content
Equivalent structure or equivalent flow shift is applied directly or indirectly in other relevant technical fields, and is similarly included in this hair
In bright scope of patent protection.
Claims (10)
1. a kind of VOCs gas detection method characterized by comprising
According to the first chromatography rule, the first separating treatment is carried out to sample, obtains total hydrocarbon and non-total hydrocarbon；
First FID detection method is used to total hydrocarbon, obtains the content of the total hydrocarbon；
According to the second chromatography rule, the second separating treatment is carried out to total hydrocarbon, obtains methane and non-methane sample；
2nd FID detection method is used to the methane, obtains the content of the methane；
According to third chromatography rule, third separating treatment is carried out to non-methane sample, obtains benzene homologues and non-benzene homologues；
3rd FID detection method is used to the benzene homologues, obtains the content of the benzene homologues.
2. VOCs gas detection method according to claim 1, which is characterized in that
According to the second chromatography rule described in step, the second separating treatment is carried out to total hydrocarbon, obtains methane and non-methane sample
Later, the 2nd FID detection method is used to the methane described in step, before obtaining the content of the methane further include:
According to the first hydro carbons blowback rule, the first reverse blowing disposal is carried out to the methane.
3. VOCs gas detection method according to claim 1, which is characterized in that
According to third chromatography rule described in step, third separating treatment is carried out to non-methane sample, obtains benzene homologues and non-
After benzene homologues, the 3rd FID detection method is used to the benzene homologues described in step, obtains going back before the content of the benzene homologues
Include:
According to the second hydro carbons blowback rule, the second reverse blowing disposal is carried out to the benzene homologues.
4. VOCs gas detection method according to claim 1, which is characterized in that
In the step of using the 3rd FID detection method to the benzene homologues described in step, obtaining before the content of the benzene homologues
Carrier gas be zero gas, the 3rd FID detection method is used to the benzene homologues described in step, obtains the load of the content of the benzene homologues
Gas is nitrogen.
5. VOCs gas detection method according to claim 4, which is characterized in that the nitrogen gas purity is not less than
99.999%, the nitrogen input pressure is not less than 0.4Mpa.
6. VOCs gas detection method according to claim 1, which is characterized in that
The first FID detection method is used to total hydrocarbon described in step, the content and step for obtaining the total hydrocarbon make the methane
With the 2nd FID detection method, the content of the methane is obtained, is carried out in the first FID detection device；
The 3rd FID detection method is used to the benzene homologues described in step, obtains the content of the benzene homologues, is examined in the 2nd FID
It is carried out in measurement equipment.
7. VOCs gas detection method according to claim 2, which is characterized in that
When the methane enters six-way valve by the first ten-way valve, the first reverse blowing disposal is carried out to the methane.
8. VOCs gas detection method according to claim 3, which is characterized in that
When the benzene homologues enter the second ten-way valve by six-way valve, the second reverse blowing disposal is carried out to the benzene homologues.
9. a kind of VOCs gas device using VOCs gas detection method described in any item of the claim 1 to 8, feature
It is, comprising:
First separative unit, for carrying out the first separating treatment to sample, obtaining total hydrocarbon and non-according to the first chromatography rule
Total hydrocarbon；
First detection unit obtains the content of the total hydrocarbon for using the first FID detection method to total hydrocarbon；
Second separative unit, for carrying out the second separating treatment to total hydrocarbon, obtaining methane and non-according to the second chromatography rule
Methane sample；
Second detection unit obtains the content of the methane for using the 2nd FID detection method to the methane；
Third separative unit, for carrying out third separating treatment to non-methane sample, obtaining benzene according to third chromatography rule
It is object and non-benzene homologues；
Third detection unit obtains the content of the benzene homologues for using the 3rd FID detection method to the benzene homologues.
10. VOCs gas device according to claim 9, which is characterized in that
The first detection unit and the second detection unit integrated configuration are in the first FID detection device；
The third detection unit is configured in the 2nd FID detection device.
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| CN206920398U (en) * | 2017-07-25 | 2018-01-23 | 杭州春来科技有限公司 | NMHC benzene homologues in-line analyzer |
| CN207457147U (en) * | 2017-09-06 | 2018-06-05 | 常州磐诺仪器有限公司 | A kind of non-methane total hydrocarbons and benzene homologues on-line monitoring chromatograph |
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2019
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05223782A (en) * | 1992-02-15 | 1993-08-31 | Horiba Ltd | Hydrocarbon analyzer |
| US20160363573A1 (en) * | 2015-06-11 | 2016-12-15 | Live Fresh Inc. | Non-methane total hydrocarbons analysis apparatus and method for the same |
| CN105572257A (en) * | 2015-12-31 | 2016-05-11 | 杭州谱育科技发展有限公司 | Methane-free total hydrocarbon and benzene series online detection device and method |
| CN205317732U (en) * | 2015-12-31 | 2016-06-15 | 杭州谱育科技发展有限公司 | Total hydrocarbon of non - methane and benzene series thing on -line measuring device |
| CN106645461A (en) * | 2016-11-14 | 2017-05-10 | 苏州冷杉精密仪器有限公司 | Online detector for non-methane hydrocarbon and benzene compounds |
| CN206920398U (en) * | 2017-07-25 | 2018-01-23 | 杭州春来科技有限公司 | NMHC benzene homologues in-line analyzer |
| CN207457147U (en) * | 2017-09-06 | 2018-06-05 | 常州磐诺仪器有限公司 | A kind of non-methane total hydrocarbons and benzene homologues on-line monitoring chromatograph |
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Application publication date: 20190920 |