CN107643352A - NMHC detection means and method - Google Patents
NMHC detection means and method Download PDFInfo
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- CN107643352A CN107643352A CN201711122759.7A CN201711122759A CN107643352A CN 107643352 A CN107643352 A CN 107643352A CN 201711122759 A CN201711122759 A CN 201711122759A CN 107643352 A CN107643352 A CN 107643352A
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Abstract
The invention provides a kind of NMHC detection means and method, belong to atmosphere pollution detection technique field.It solves existing NMHC assay device structures complexity, the technical problem of detection duration.The present invention includes a sample gas passage, one carrier gas passage, the first quantitative module, the second quantitative module, the methane chromatographic column and total hydrocarbon chromatographic column that are successively set in carrier gas passage and the detector being connected with carrier gas passage, in addition to for switching the how logical sampling valve of stream.The present invention is switched over by more logical sampling valve, only needs a sample gas passage and a carrier gas passage to complete the detection of NMHC and the blowback of methane chromatographic column.The present invention have it is simple in construction, it is simple to operate, detection the used time it is short the advantages of.
Description
Technical field
The invention belongs to gas analyzer technical field, more particularly to a kind of NMHC detection means and 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。
Existing NMHC measuring method is gas chromatography, and the overwhelming majority determines non-methane using minusing
Total hydrocarbon content, minusing measure total hydrocarbon content and methane content in sample gas respectively, and total hydrocarbon content is subtracted into methane content produces
To the content of NMHC.Existing NMHC analyzer is largely all examined using two detectors at present
Survey, when two detectors detect to total hydrocarbon content and methane content respectively, inevitably because between detector
Difference causes error.
In order to solve this problem, number of patent application is that " 201511024145.6 " patent name NMHC is examined online
The patent of device is surveyed, which disclose a kind of scheme, the program passes through a sampling valve, two chromatographic columns and a detection
Device measures the content of NMHC in sample gas, avoids because detection error caused by difference between different detectors.
But the patent formula needs two carrier gas passages to be operated, structure is still complicated, and testing cost is higher
The content of the invention
The purpose of the present invention is above mentioned problem be present for existing technology, it is proposed that a kind of NMHC detection dress
Put, have it is simple in construction, can be detected by a detector and a carrier gas passage.
The purpose of the present invention can be realized by following technical proposal：
A kind of NMHC detection means, including a sample gas passage, a carrier gas passage, the first quantitative module, the
Two quantitative modules, the methane chromatographic column and total hydrocarbon chromatographic column that are successively set in carrier gas passage and the inspection being connected with carrier gas passage
Device is surveyed, the detection means further comprises：
More logical sampling valve, the switching of more logical sampling valves optionally make the first quantitative module be connected into sample gas passage
It is used to detect for quantifying or making the first quantitative module to be connected into carrier gas passage, wherein, when the first quantitative module is used to detect
When, the first quantitative module is located at before methane chromatographic column, and the sample that carrier gas is carried in the first quantitative module passes through methane color successively
Enter detector after spectrum post and total hydrocarbon chromatographic column, the second quantitative module is connected into sample gas passage for quantitative accordingly；When first fixed
When measuring module and being used for quantitative, the described second quantitative module be connected into carrier gas passage positioned at methane chromatographic column and total hydrocarbon chromatographic column it
Between, carrier gas be redirected back into the sample that methane chromatographic column carries out blowback to methane chromatographic column and carried in the second quantitative module pass through it is total
Enter detector after hydrocarbon chromatographic column.
Preferably, more logical sampling valves are ten-way valve.
Preferably, being additionally provided with extension tube in the carrier gas passage, the extension tube is entered for extension tube upstream gas
Enter the time of extension tube components downstream.
Preferably, the extension tube is between the first chromatographic column and Duo Tong sampling valves.
Preferably, also including heating module, the heating module is used to heat to the NMHC detection means.
Present invention also offers a kind of NMHC detection method, the detection method comprises the following steps：
NMHC detection means described in claim 1 to claim 4 any claim is provided a,；
B, quantitative and blowback：More logical sample introduction Vavle switching makes the first quantitative module be connected into sample intake passage, makes the second quantitative mould
Block is connected into carrier gas passage, and makes the air inlet of methane chromatographic column opposite with carrier gas approach axis；It is passed through in sample intake passage
Sample gas, sample gas are quantitatively stored in the first quantitative module after entering the first quantitative module, carrier gas are passed through in carrier gas passage, carrier gas is anti-
To the progress blowback of methane chromatographic column and total hydrocarbon chromatographic column is purged into methane chromatographic column；
C, CH_4 detection：More logical sample introduction Vavle switchings make the save sample first quantitative module be connected into carrier gas passage,
The second quantitative module is set to be connected into sample gas passage；Carrier gas is passed through in carrier gas passage, carrier gas is by the first quantitative module, by first
Sample in quantitative module carries to be detected by methane chromatographic column and total hydrocarbon chromatographic column arrival detector successively, obtains sample
The amount of middle methane, while sample gas is passed through in sample gas passage, make to preserve quantitative sample in the second quantitative module；
D, total hydrocarbon detects：More logical sampling valve switches back into b step state, and sample gas is passed through in sample gas passage, makes the first quantitative mould
Block sample introduction is preserved, and carrier gas is passed through in carrier gas passage, and carrier gas carries out blowback to methane chromatographic column and carries methane chromatographic column and total hydrocarbon
Sample between chromatographic column in the second quantitative module is via the total hydrocarbon for detecting to obtain into detector after total hydrocarbon chromatographic column in sample
Content；
E, the content that methane in step c is subtracted according to the obtained total hydrocarbon content detected in Step d obtains NMHC
Content.
Preferably, the NMHC detection method also includes heating stepses：
Open heating module and whole heating is carried out to NMHC detection means.
The present invention has advantages below：
1st, coordinate flow path designs while the present invention leads to sampling valve using switching, using sampling valve is led to one, all the way more
Carrier gas passage and a detector realize the detection of NMHC, and apparatus structure is simple, highly reliable, avoids dual detector
The response difference of band, detection used time are short.
2nd, the present invention completes the detection of NMHC using sub-sampling, to first while total hydrocarbon content detection is carried out
Alkane chromatographic column carries out blowback, it is not necessary to which extra step carries out blowback program, reduces the detection used time.
Brief description of the drawings
Fig. 1 is the structural representation under quantitative and purging state of the invention, while is also the structure under total hydrocarbon detection state
Schematic diagram；
Fig. 2 is the structural representation under CH_4 detection state of the present invention.
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 depicted in figs. 1 and 2, the invention provides a kind of NMHC detection means, a kind of NMHC detection
Device, including a sample gas passage, a carrier gas passage, the first quantitative module 5, the second quantitative module 6, it is successively set on carrier gas
Methane chromatographic column 2 and total hydrocarbon chromatographic column 3 on passage and the detector 4 being connected with carrier gas passage, the detection means enter one
Step includes：
More logical sampling valves 1, the switchings of more logical sampling valves 1 optionally make the first quantitative module 5 be connected into sample gas to lead to
It is used for quantitative in road or the first quantitative module 5 is connected into for detecting in carrier gas passage, wherein, when the first quantitative module 5 is used
When detection, the first quantitative module 5 is located at before methane chromatographic column 2, and the sample that carrier gas is carried in the first quantitative module 5 passes through successively
Cross after methane chromatographic column 2 and total hydrocarbon chromatographic column 3 and enter detector 4, the second quantitative module 6 be connected into accordingly sample gas passage be used for it is fixed
Amount；When the first quantitative module 5 is used for quantitative, the described second quantitative module 6, which is connected into carrier gas passage, is located at the He of methane chromatographic column 2
Between total hydrocarbon chromatographic column 3, carrier gas is redirected back into methane chromatographic column 2 and blowback is carried out to methane chromatographic column 2 and carries the second quantitative mould
Sample on block 6 is by entering detector 4 after total hydrocarbon chromatographic column 3.
Switch for the ease of flow path designs and stream, it is preferred that more logical sampling valves 1 are ten-way valve.
In the present embodiment, when total hydrocarbon content detects, the blowback of methane chromatographic column 2 and the measurement of total hydrocarbon content are same
Completed in the carrier gas passage of road, in order to prevent the residual component in methane chromatographic column 2 from influenceing the detection of total hydrocarbon content, it is necessary to postpone
Carrier gas is reached the used time of the second quantitative module 6 by methane chromatographic column 2.Thus, this implementation is additionally provided with the carrier gas passage
Extension tube 7, the extension tube 7 is between the first chromatographic column and Duo Tong sampling valves 1.
Carrier gas reaches the second quantitative module 6 by methane chromatographic column 2 to be needed by extension tube 7, is delayed by extension tube 7
The gas of the upstream of long tube 7 enters the time of the second quantitative module 6, prevents occurring peak figure interference when being detected to total hydrocarbon.
Need exist for it is further noted that, in initial quantitative state, i.e., the first quantitative module 5 is connected into sample gas and led to
When in road, extension tube 7 be before methane chromatographic column 2 and total hydrocarbon chromatographic column 3, so, sample gas by the first quantitative module 5 to
It can increase up to the used time of methane chromatographic column 2 and total hydrocarbon chromatographic column 3, due to there is a promotion of sample gas, the residual gas in sample gas passage
The purging completed to methane chromatographic column 2 and total hydrocarbon chromatographic column 3 one step ahead is returned, until sample gas enters methane chromatographic column 2 and total hydrocarbon color
Post 3 is composed, so adds the accuracy of testing result.
Preferably, also including heating module, the heating module is used to heat to the NMHC detection means.
Present invention also offers a kind of NMHC detection method, the detection method comprises the following steps：
NMHC detection means described in claim 1 to claim 4 any claim is provided a,；
B, quantitative and blowback：The more logical switching of sampling valve 1 makes the first quantitative module 5 be connected into sample intake passage, makes second to quantify
Module 6 is connected into carrier gas passage, and makes the air inlet of methane chromatographic column 2 opposite with carrier gas approach axis；In sample intake passage
Sample gas is passed through, sample gas is quantitatively stored in the first quantitative module 5 after entering the first quantitative module 5, and carrier gas is passed through in carrier gas passage,
Carrier gas is redirected back into methane chromatographic column 2 and blowback is carried out to methane chromatographic column 2 and total hydrocarbon chromatographic column 3 is purged；
C, CH_4 detection：More logical sampling valves 1, which switch, makes the save sample first quantitative module 5 be connected into carrier gas passage
In, the second quantitative module 6 is connected into sample gas passage；Carrier gas is passed through in carrier gas passage, carrier gas quantifies module 5 by first,
Sample in first quantitative module 5 is carried and reaches detector 4 by methane chromatographic column 2 and total hydrocarbon chromatographic column 3 successively and is examined
Survey, obtain the amount of methane in sample, while sample gas is passed through in sample gas passage, make to preserve quantitative sample in the second quantitative module 6；
D, total hydrocarbon detects：More logical sampling valve 1 switches back into b step state, and sample gas is passed through in sample gas passage, makes the first quantitative mould
The sample introduction of block 5 preserves, and is passed through carrier gas in carrier gas passage, and carrier gas carries out blowback to methane chromatographic column 2 and carries methane chromatographic column 2 and total
Sample between hydrocarbon chromatographic column 3 in second quantitative module 6 is obtained in sample via the detection of detector 4 is entered after total hydrocarbon chromatographic column 3
Total hydrocarbon content；
E, the content that methane in step c is subtracted according to the obtained total hydrocarbon content detected in Step d obtains NMHC
Content.
Preferably, the NMHC detection method also includes heating stepses：
Open heating module and whole heating is carried out to NMHC detection means.
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 (7)
1. a kind of NMHC detection means, it is characterised in that including a sample gas passage, a carrier gas passage, first is fixed
Measure module, the second quantitative module and is led at the methane chromatographic column and total hydrocarbon chromatographic column being successively set in carrier gas passage with carrier gas
The connected detector in road, the detection means further comprise：
More logical sampling valves, the switchings of more logical sampling valves optionally make the first quantitative module be connected into sample gas passage to be used for
It is quantitative or make the first quantitative module be connected into carrier gas passage to be used to detect, wherein, when the first quantitative module is used to detect, the
A certain amount of module is located at before methane chromatographic column, carrier gas carry sample in the first quantitative module successively by methane chromatographic column and
Enter detector after total hydrocarbon chromatographic column, the second quantitative module be connected into accordingly sample gas passage be used for it is quantitative；When the first quantitative module
For it is quantitative when, the described second quantitative module is connected into carrier gas passage between methane chromatographic column and total hydrocarbon chromatographic column, carrier gas
It is redirected back into the sample that methane chromatographic column carries out blowback to methane chromatographic column and carried in the second quantitative module and passes through total hydrocarbon chromatogram
Enter detector after post.
2. NMHC detection means according to claim 1, it is characterised in that more logical sampling valves are ten logical
Valve.
3. NMHC detection means according to claim 1, it is characterised in that be additionally provided with the carrier gas passage
Extension tube, the extension tube are used for the time that extension tube upstream gas enters extension tube components downstream.
4. NMHC detection means according to claim 3, it is characterised in that the extension tube is located at the first chromatogram
Between post and Duo Tong sampling valves.
5. NMHC detection means according to claim 4, it is characterised in that described to add also including heating module
Thermal modules are used to heat to the NMHC detection means.
A kind of 6. NMHC detection method, it is characterised in that：
NMHC detection means described in claim 1 to claim 4 any claim is provided a,；
B, quantitative and blowback：More logical sample introduction Vavle switching makes the first quantitative module be connected into sample intake passage, connects the second quantitative module
Enter into carrier gas passage, and make the air inlet of methane chromatographic column opposite with carrier gas approach axis；Sample gas is passed through in sample intake passage,
Sample gas is quantitatively stored in the first quantitative module after entering the first quantitative module, carrier gas is passed through in carrier gas passage, carrier gas is reversely entered
Enter methane chromatographic column to carry out methane chromatographic column blowback and purge total hydrocarbon chromatographic column；
C, CH_4 detection：More logical sample introduction Vavle switchings make the save sample first quantitative module be connected into carrier gas passage, make the
Two quantitative modules are connected into sample gas passage；Carrier gas is passed through in carrier gas passage, carrier gas quantifies by the first quantitative module by first
Sample in module carries to be detected by methane chromatographic column and total hydrocarbon chromatographic column arrival detector successively, obtains first in sample
The amount of alkane, while sample gas is passed through in sample gas passage, make to preserve quantitative sample in the second quantitative module；
D, total hydrocarbon detects：More logical sampling valve switches back into b step state, and sample gas is passed through in sample gas passage, enters the first quantitative module
Sample is preserved, and carrier gas is passed through in carrier gas passage, and carrier gas carries out blowback to methane chromatographic column and carries methane chromatographic column and total hydrocarbon chromatogram
Sample between post in the second quantitative module is via the total hydrocarbon content for detecting to obtain into detector after total hydrocarbon chromatographic column in sample；
E, the content that methane in step c is subtracted according to the obtained total hydrocarbon content detected in Step d obtains NMHC content.
7. NMHC detection method according to claim 6, it is characterised in that the NMHC detection method
Also include heating stepses：
Open heating module and whole heating is carried out to NMHC detection means.
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Cited By (5)
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| CN109490443A (en) * | 2018-12-21 | 2019-03-19 | 浙江全世科技有限公司 | A kind of non-methane total hydrocarbons content detection device and method |
| CN109541054A (en) * | 2018-11-15 | 2019-03-29 | 浙江全世科技有限公司 | A kind of device and method directly detecting non-methane total hydrocarbons content |
| CN109765318A (en) * | 2019-02-15 | 2019-05-17 | 南京霍普斯科技有限公司 | A kind of detection device and method of non-methane total hydrocarbons |
| CN112798714A (en) * | 2021-02-03 | 2021-05-14 | 中国科学院空天信息创新研究院 | Detection system and method for non-methane total hydrocarbons |
| CN114354791A (en) * | 2021-12-29 | 2022-04-15 | 杭州谱育科技发展有限公司 | Detection system and method for non-methane total hydrocarbons |
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