CN107748232A - NMHC and benzene homologues detection means and detection method - Google Patents
NMHC and benzene homologues detection means and detection method Download PDFInfo
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- CN107748232A CN107748232A CN201711123883.5A CN201711123883A CN107748232A CN 107748232 A CN107748232 A CN 107748232A CN 201711123883 A CN201711123883 A CN 201711123883A CN 107748232 A CN107748232 A CN 107748232A
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 title claims abstract description 153
- 238000001514 detection method Methods 0.000 title claims abstract description 95
- 239000007789 gas Substances 0.000 claims abstract description 121
- 239000012159 carrier gas Substances 0.000 claims abstract description 91
- 238000005070 sampling Methods 0.000 claims abstract description 55
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 44
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 43
- 239000012491 analyte Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 80
- 150000002430 hydrocarbons Chemical class 0.000 claims description 43
- 150000001555 benzenes Chemical class 0.000 claims description 25
- 238000010926 purge Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000002203 pretreatment Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000003556 assay Methods 0.000 abstract 1
- -1 hydrocarbon benzene series Chemical class 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 150000001335 aliphatic alkanes Chemical class 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000005623 Carcinogenesis Diseases 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000036952 cancer formation Effects 0.000 description 1
- 231100000504 carcinogenesis Toxicity 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010943 off-gassing Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0047—Specially adapted to detect a particular component for organic compounds
Abstract
The invention provides a kind of NMHC and benzene homologues detection means and detection method, belongs to atmosphere pollution detection technique field.It solves existing NMHC and benzene homologues assay device structures complexity, the technical problem of detection duration.The present invention passes through one ten logical sampling valve and a four-way sampling valve, to switch two-way carrier gas passage and all the way gas circuit structure of sample gas passage, form three pretreatment, CH_4 detection and total hydrocarbon benzene series analyte detection detection states, it is sequentially completed three detection process, you can complete the detection of NMHC and benzene homologues.The advantages of present invention simplifies with structure, and the testing result degree of accuracy is high, and the detection used time is short.
Description
Technical field
The invention belongs to gas analyzer technical field, more particularly to a kind of NMHC detection means and detection side
Method.
Background technology
NMHC typically refers to all volatilizable hydrocarbons (mainly C2-C8) in addition to methane.Greatly
NMHC in gas exceedes finite concentration, at human health, moreover it is possible to produces chemical fumes, environment and the mankind is caused great
Harm.China《Discharge standard of air pollutants》Factory's circle concentration standard of NMHC be 5mg/m3。
Benzene homologues are the colourless volatile organic matters for having special aromatic odor, are widely used in paint, agricultural chemicals, medicine, have
In the industries such as machine chemical industry.Benzene homologues are compounds common in waste gas of pollutant and surrounding air, to ambient air quality and people
Body health is toxic, there is carcinogenesis, is the pollutant of China's environment measuring preecedence requirement control.
Therefore, many stationary sources and environment measuring website are required for detecting NMHC and benzene homologues simultaneously, and one
As detected respectively using two sets of instruments, various problems in actual application be present：
1st, instrument quantity is more, and the related device is also more, and device is complicated, and cost is high, it is necessary to which the space taken is big；
2nd, benzene homologues are analyzed, it is necessary to configure two using one set of instrument, single injected sampling analysis NMHC, another single injected sampling
Individual injection port, two detectors, device is complicated, cumbersome；
3rd, accuracy is low, and NMHC and benzene homologues are detected using different detectors, and different detectors
Difference is there may be in response, causes testing result to there may be difference.
The content of the invention
The purpose of the present invention is above mentioned problem be present for existing technology, it is proposed that one kind is simple in construction, accuracy is good,
The high NMHC of testing efficiency and benzene homologues detection means.
The purpose of the present invention can be realized by following technical proposal：
A kind of NMHC and benzene homologues detection means, including 10 logical sampling valves, a four-way sampling valve, with ten lead into
The first connected carrier gas source of sample valve and sample source of the gas, the second carrier gas source being connected with four-way sampling valve, originate in the first carrier gas source
First carrier gas passage, originate in the second carrier gas passage of the second carrier gas source, originate in the sample gas passage of sample source of the gas, pass through described ten
Logical sampling valve and four-way sample introduction Vavle switching alternative be connected into the first quantitative module of each passage, the second quantitative module,
Methane analytical column, total hydrocarbon analytical column and benzene homologues analytical column；
Ten logical sampling valves and four-way sample introduction Vavle switching can change the first carrier gas passage, the second carrier gas passage and sample gas passage
Gas circuit structure simultaneously makes the detection means form three kinds of pre-treatment, CH_4 detection, total hydrocarbon and benzene series analyte detection working conditions；
During in pre-treatment state, methane analytical column, the second quantitative module, total hydrocarbon analytical column are connected into the first carrier gas successively
Purging gas circuit one is formed in passage, benzene homologues analytical column is connected into the second carrier gas passage and forms purging gas circuit two, the first quantitative module
Sample gas passage sample introduction is connected into, wherein, the methane analytical column in gas circuit one is purged to be reversely connected into；
During in CH_4 detection state, the first quantitative module, methane analytical column, total hydrocarbon analytical column are connected into the first carrier gas successively
CH_4 detection gas circuit is formed in passage, identical when the second carrier gas passage gas circuit structure is with pre-treatment state, the second quantitative module connects
Enter sample gas passage sample introduction；
During in total hydrocarbon and benzene series analyte detection state, methane analytical column, benzene homologues analytical column are connected into the first carrier gas and led to successively
Road forms benzene series analyte detection gas circuit, and the second quantitative module, total hydrocarbon analytical column are connected into the second carrier gas passage and form total hydrocarbon detection successively
Gas circuit, wherein, methane analytical column is reversely to be connected into benzene series analyte detection gas circuit.
Preferably, the quantity of the detector is one, first carrier gas passage and the second carrier gas passage pass through three
Port valve connects the detector.
Preferably, also including heating module, the heating module is used for the NMHC and benzene series analyte detection
Device heats.
Present invention also offers it is a kind of using claim 1-3 any claims described in NMHC and benzene homologues
The detection method of detection means, NMHC and the benzene series object detecting method comprise the following steps：
A, it is quantitative：Ten logical sample introduction Vavle switchings, the first quantitative module is set to be connected into sample gas passage, sample gas passage enters sample
Gas, sample gas are discharged after the first quantitative module by the outlet of sample gas passage, and quantitative sample gas is preserved in the first quantitative module；
B, CH_4 detection：Ten logical sample introduction Vavle switchings, the full of sample gas first quantitative module is set to be connected into the first carrier gas passage
It is interior, and the second quantitative module is connected into sample gas passage, carrier gas is passed through in the first carrier gas passage, carrier gas carries the first quantitative loop
Interior sample gas enters detector after methane analytical column and total hydrocarbon analytical column successively, obtains the content of methane in sample gas, together
When sample gas passage in be passed through sample gas, sample gas is discharged after the second quantitative module by the outlet of sample gas passage, the second quantitative module
It is interior to preserve quantitative sample gas；
C, total hydrocarbon and benzene series analyte detection：The logical sampling valve of switching ten simultaneously switches four-way sampling valve simultaneously, makes the second quantitative module
It is connected into successively in the second carrier gas passage with total hydrocarbon analytical column, methane analytical column and benzene homologues analytical column is connected into the first carrier gas successively
In passage, the content of total hydrocarbon and the content of benzene homologues are obtained.
Preferably, the detection method also includes：
Purging：While a steps, the methane analytical column in the first carrier gas passage and total hydrocarbon analytical column are purged,
Benzene homologues analytical column in second carrier gas passage is purged.
Preferably, the NMHC and benzene series object detecting method also include heating stepses：
Open heating module and whole heating is carried out to NMHC and benzene homologues detection means.
The present invention has advantages below：
Coordinate flow path designs while the present invention is using the logical sampling valve of switching ten and four-way sampling valve, led to using two-way carrier gas
Road and a detector realize the detection of NMHC and benzene homologues content, and apparatus structure is simple, highly reliable, avoid double
The response difference of detector band, detection used time are short.
Brief description of the drawings
Fig. 1 is structural representation under pre-treatment state of the present invention；
Fig. 2 is the structural representation under CH_4 detection state of the present invention；
Fig. 3 is the structural representation under total hydrocarbon and benzene series analyte detection state of the present invention.
In figure, 1, ten logical sampling valves；2nd, methane analytical column；3rd, total hydrocarbon analytical column；4th, detector；5th, the first quantitative module；
6th, the second quantitative module；7th, four-way sampling valve；8th, benzene homologues analytical column.
Embodiment
It is the specific embodiment of the present invention and with reference to accompanying drawing below, technical scheme is further described,
But the present invention is not limited to these embodiments.
As shown in Figure 1 to Figure 3, the invention provides a kind of NMHC and benzene homologues detection means, including 10 logical
Sampling valve 1, a four-way sampling valve 7, the first carrier gas source being connected with ten logical sampling valves 1 and sample source of the gas, are connected with four-way sampling valve 7
The second carrier gas source, originate in the first carrier gas passage of the first carrier gas source, originate in the second carrier gas passage of the second carrier gas source, rise
Start from the sample gas passage of sample source of the gas, by described ten logical sampling valves 1 and four-way sampling valve 7 switch alternative be connected into it is described each
The quantitative module 5, second of the first of passage quantitative module 6, methane analytical column 2, total hydrocarbon analytical column 3 and benzene homologues analytical column 8；
Ten logical sampling valve 1 and four-way sampling valve 7 switchings can change the first carrier gas passage, the second carrier gas passage and sample gas passage
Gas circuit structure and the detection means is formed three kinds of pre-treatment, CH_4 detection, total hydrocarbon and benzene series analyte detection working conditions；
Specifically, the logical sampling valve 1 of switching ten and four-way sampling valve 7, make detection means be in the gas circuit knot of pre-treatment state
Structure is as shown in Figure 1.
During in holding state, the carrier gas in the second carrier gas source is successively after four-way sampling valve 7 and benzene homologues analytical column 8
Detector 4 is connected into, forms purging gas circuit two；Carrier gas in first carrier gas source successively by ten logical sampling valves 1, methane analytical column 2,
Four-way sampling valve 7, ten, which leads to after the quantitative module 6, ten of sampling valve 1, second leads to sampling valve 1 and total hydrocarbon analytical column 3, is connected into detector 4,
Form purging gas circuit one；First quantitative module 5 is connected into sample introduction in sample gas passage.
During holding state, sample gas is passed through in sample gas passage, sample gas during the first quantitative module 5 by preserving a certain amount of sample gas
Prepared for the detection of next stage.Carrier gas is passed through in purging gas circuit one to enter the device in purging gas circuit one and purging gas circuit one
Row purging, preserves the cleaning of gas path pipe.Likewise, carrier gas is passed through in purging gas circuit two to purging gas circuit two and purging gas circuit
Benzene homologues analytical column 8 on two is purged, purge gas circuit two on be passed through carrier gas also have protect benzene homologues analytical column 8 not by oxygen
The effect of change.
By the processing of holding state, the same time completes the first carrier gas passage and the purging of the second carrier gas passage and first
Quantitative module 5 is quantified, and few the time required to whole process, each process is not disturbed between each other.
Ten logical sampling valves 1 of switching, make detection means be in CH_4 detection state gas circuit structure it is as shown in Figure 2.
During in CH_4 detection state, the carrier gas in the first carrier gas source is successively via the ten logical quantitative modules of sampling valve 1, first
5th, ten logical sampling valves 1, four-way sampling valve 7, methane analytical column 2, ten are connected into the shape of detector 4 after leading to sampling valve 1 and total hydrocarbon analytical column 3
Into CH_4 detection gas circuit.Second quantitative module 6 is connected into sample gas passage sample introduction.
When detecting methane content, the sample gas that carrier gas is carried in the first quantitative loop first passes through methane analytical column 2, the first in sample gas
Alkane composition quickly flows out methane analytical column 2 with carrier gas, and the other compositions in sample gas are trapped in methane analytical column 2, carry first
After the carrier gas of alkane reaches detector 4, the content of methane is detected by detector 4.At the same time, sample gas is passed through in sample gas passage,
Second quantitative module 6 is completed sample introduction and quantified, and is ready for the detection of next stage.
It is to be herein pointed out when detection means is switched to CH_4 detection state by preprocessed state, four-way sampling valve 7
Do not do and switch, benzene homologues analytical column 8 is still within purging in gas circuit two and keeps purging state.
The logical sampling valve 1 of switching ten and four-way sampling valve 7, make detection means be in total hydrocarbon and benzene series analyte detection state.
During in total hydrocarbon and benzene series analyte detection state, as shown in figure 3, the carrier gas of the first carrier gas source is successively by ten logical sample introductions
Valve 1, methane analytical column 2, four-way sampling valve 7, benzene homologues analytical column 8 and detector 4 form benzene series analyte detection gas circuit.In benzene homologues
Detect in gas circuit, methane analytical column 2 is reversely accessed, and airintake direction and outgassing direction and the methane of namely for methane analytical column 2 are examined
On the contrary, the non-methane gas componant left in CH_4 detection state can easily be carried by carrier gas and go out entrance during survey state
Separated to benzene homologues analytical column 8, and be successively flowed into detector 4 and detected, obtain the content of benzene homologues.
It is logical that the carrier gas of second carrier gas source of the gas leads to the quantitative module 6, ten of sampling valve 1, second by four-way sampling valve 7, ten successively
Sampling valve 1, total hydrocarbon analytical column 3 and detector 4 form total hydrocarbon detection gas circuit, and the sample gas that carrier gas is carried in the second quantitative module 6 enters
Enter to be flowed into after total hydrocarbon analytical column 3 is handled in detector 4 and detect, obtain total hydrocarbon content.
Further, the quantity of detector 4 of this detection means is one, and the first carrier gas passage and the second carrier gas passage pass through
One triple valve is attached with same detector 4, during detection, by controlling two-way carrier gas to reach the time of detector 4 not
With separate detection is carried out, so as to reduce the number of devices of this detection means.
Further, this detection means also includes heating module, and temperature is carried out to whole detection means by heating module
Control, ensure in whole detection process, the gas difference variation in detection means gas circuit is small, detection error is reduced with this.
In summary, this by one ten logical sampling valve 1 and a switching of four-way sampling valve 7 change the first carrier gas passage,
The gas circuit structure of second carrier gas passage and sample gas passage, it is total only with two quantitative modules, a methane analytical column 2, one
3, benzene homologues analytical columns 8 of hydrocarbon analytical column and a detector 4 just complete NMHC and benzene homologues content in sample gas
Detection, whole structure of the detecting device is simple, and the testing result degree of accuracy is high.
Present invention also offers a kind of NMHC and the detection method of benzene homologues detection means, the NMHC
Comprise the following steps with benzene series object detecting method：
A, it is quantitative：Ten logical sampling valves 1 switch, and the first quantitative module 5 is connected into sample gas passage, sample gas passage enters sample
Gas, sample gas are discharged after the first quantitative module 5 by the outlet of sample gas passage, and quantitative sample gas is preserved in the first quantitative module 5；
B, CH_4 detection：Ten logical sampling valves 1 switch, and the full of sample gas first quantitative module 5 is connected into the first carrier gas and lead to
In road, and the second quantitative module 6 is connected into sample gas passage, carrier gas is passed through in the first carrier gas passage, it is fixed that carrier gas carries first
Sample gas in amount ring enters detector 4 after methane analytical column 2 and total hydrocarbon analytical column 3 successively, obtains methane in sample gas
Content, while sample gas is passed through in sample gas passage, sample gas is discharged after the second quantitative module 6 by the outlet of sample gas passage, and second
Quantitative sample gas is preserved in quantitative module 6；
C, total hydrocarbon and benzene series analyte detection：The logical sampling valve 1 of switching ten simultaneously switches four-way sampling valve 7 simultaneously, makes the second quantitative mould
Block 6 and total hydrocarbon analytical column 3 are connected into the second carrier gas passage successively, methane analytical column 2 and benzene homologues analytical column 8 is connected into successively
In one carrier gas passage, the content of total hydrocarbon and the content of benzene homologues are obtained.
Preferably, the detection method also includes：
Purging：While a steps, the methane analytical column 2 in the first carrier gas passage and total hydrocarbon analytical column 3 are blown
Sweep, the benzene homologues analytical column 8 in the second carrier gas passage is purged.
Preferably, the NMHC and benzene series object detecting method also include heating stepses：
Open heating module and whole heating is carried out to NMHC and benzene homologues detection means.
Using this detection method, whole detection process is completed by three steps, every gas circuit is fully used, phase
It does not interfere with each other, the detection used time is short.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (6)
1. a kind of NMHC and benzene homologues detection means, it is characterised in that including 10 logical sampling valves, a four-way sample introduction
Valve, the first carrier gas source and sample source of the gas, the second carrier gas source being connected with four-way sampling valve being connected with ten logical sampling valves, originate in the
First carrier gas passage of one carrier gas source, originate in the second carrier gas passage of the second carrier gas source, originate in the sample gas passage of sample source of the gas,
The first of each passage, which is connected into, by described ten logical sampling valves and four-way sample introduction Vavle switching alternative quantifies module, second
Quantitative module, methane analytical column, total hydrocarbon analytical column and benzene homologues analytical column；
Ten logical sampling valves and four-way sample introduction Vavle switching can change the gas circuit of the first carrier gas passage, the second carrier gas passage and sample gas passage
Structure simultaneously makes the detection means form three kinds of pre-treatment, CH_4 detection, total hydrocarbon and benzene series analyte detection working conditions；
During in pre-treatment state, methane analytical column, the second quantitative module, total hydrocarbon analytical column are connected into the first carrier gas passage successively
Interior to form purging gas circuit one, benzene homologues analytical column is connected into the second carrier gas passage and forms purging gas circuit two, and the first quantitative module is connected into
Sample gas passage sample introduction, wherein, the methane analytical column in gas circuit one is purged to be reversely connected into；
During in CH_4 detection state, the first quantitative module, methane analytical column, total hydrocarbon analytical column are connected into the first carrier gas passage successively
Interior formation CH_4 detection gas circuit, identical when the second carrier gas passage gas circuit structure is with pre-treatment state, the second quantitative module is connected into sample
Gas passage sample introduction；
During in total hydrocarbon and benzene series analyte detection state, methane analytical column, benzene homologues analytical column are connected into the first carrier gas passage shape successively
Into benzene series analyte detection gas circuit, the second quantitative module, total hydrocarbon analytical column are connected into the second carrier gas passage and form total hydrocarbon detection gas circuit successively,
Wherein, methane analytical column is reversely to be connected into benzene series analyte detection gas circuit.
2. NMHC according to claim 1 and benzene homologues detection means, it is characterised in that the number of the detector
Measure as one, first carrier gas passage connects the detector with the second carrier gas passage by triple valve.
3. NMHC according to claim 2 and benzene homologues detection means, it is characterised in that also including heated mould
Block, the heating module are used to heat to the NMHC and benzene homologues detection means.
A kind of 4. detection side of NMHC and benzene homologues detection means using described in claim 1-3 any claims
Method, it is characterised in that NMHC and the benzene series object detecting method comprises the following steps：
A, it is quantitative：Ten logical sample introduction Vavle switchings, the first quantitative module is set to be connected into sample gas passage, sample gas passage enters sample gas, sample
Gas is discharged after the first quantitative module by the outlet of sample gas passage, and quantitative sample gas is preserved in the first quantitative module；
B, CH_4 detection：Ten logical sample introduction Vavle switchings, the full of sample gas first quantitative module is set to be connected into the first carrier gas passage, and
The second quantitative module is connected into sample gas passage, carrier gas is passed through in the first carrier gas passage, carrier gas is carried in the first quantitative loop
Sample gas enters detector after methane analytical column and total hydrocarbon analytical column successively, obtains the content of methane in sample gas, while sample
Sample gas is passed through in gas passage, sample gas is discharged after the second quantitative module by the outlet of sample gas passage, is protected in the second quantitative module
Deposit quantitative sample gas；
C, total hydrocarbon and benzene series analyte detection：Ten logical sampling valves of switching simultaneously switch four-way sampling valve simultaneously, make the second quantitative module and total
Hydrocarbon analytical column is connected into the second carrier gas passage successively, methane analytical column and benzene homologues analytical column is connected into the first carrier gas passage successively
It is interior, obtain the content of total hydrocarbon and the content of benzene homologues.
5. NMHC according to claim 4 and benzene series object detecting method, it is characterised in that the detection method is also
Including：
Purging：While a steps, the methane analytical column in the first carrier gas passage and total hydrocarbon analytical column are purged, to
Benzene homologues analytical column in two carrier gas passages is purged.
6. NMHC according to claim 5 and benzene series object detecting method, it is characterised in that the NMHC
Also include heating stepses with benzene series object detecting method：
Open heating module and whole heating is carried out to NMHC and benzene homologues detection means.
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