CN105717065B - The continuous monitoring device and its method of work of non-methane total hydrocarbons - Google Patents
The continuous monitoring device and its method of work of non-methane total hydrocarbons Download PDFInfo
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- CN105717065B CN105717065B CN201610214325.9A CN201610214325A CN105717065B CN 105717065 B CN105717065 B CN 105717065B CN 201610214325 A CN201610214325 A CN 201610214325A CN 105717065 B CN105717065 B CN 105717065B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 46
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 46
- 238000012806 monitoring device Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 52
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 238000005259 measurement Methods 0.000 claims abstract description 37
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 19
- 238000004847 absorption spectroscopy Methods 0.000 claims abstract description 8
- 230000003595 spectral effect Effects 0.000 claims abstract description 7
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 6
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 54
- 238000010521 absorption reaction Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 10
- 238000001228 spectrum Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000001285 laser absorption spectroscopy Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- Life Sciences & Earth Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention provides the continuous monitoring device and its method of work of a kind of non-methane total hydrocarbons, the continuous monitoring device includes fid detector；Further comprise：Light source, for the light source for sending measurement light, the wavelength of the measurement light covers the absorption spectrum spectral line of methane；Detection cell, the detection cell are used to accommodate under test gas；Detector, the detector is used to that electric signal will to be converted to through the measurement light of under test gas in the detection cell, and is transmitted to computing module；Computing module, the computing module is used to be handled the electric signal using absorption spectroscopy techniques and be drawn methane content under test gas, and knows the content of non-methane total hydrocarbons under test gas according to the total hydrocarbon content that the fid detector exports.The present invention has many advantages, such as real-time, continuous monitoring non-methane total hydrocarbons.
Description
Technical field
The present invention relates to the continuous monitoring devices and its method of work of gas analysis, more particularly to non-methane total hydrocarbons.
Background technology
Current non-methane total hydrocarbons analyzer is the discontinuity measurement method of gas chromatography principle.Specially utilize color
Methane separation in tested gas is out individually detected by spectrum isolation technics using flame ionization ditector (FID),
It is detected again to being tested the total hydrocarbon in gas using fid detector simultaneously, then total hydrocarbon concentration draws non-first after subtracting methane concentration
Alkane total hydrocarbon concentration value.Due to separating tested gas using chromatographic column, and it is intended to carry out after each separation of chromatographic column lazy
Property blow-back is ready for measuring next time, so which measurement is caused to be only discontinuity detection, analysis efficiency relatively low (one
As for 1 to 2 minute detection once).
At present, the laser spectrum gas based on DLAS (Diode Laser Absorption Spectroscopy) technology
Analytical equipment is widely used in gasmetry, such as in steel, cement, chemical industry, environmental protection field process gas measurement of concetration.
The basic principle of DLAS technologies is：The wavelength of tuning measurement light, makes it correspond to the absorption line of under test gas；It surveys
Amount light is through under test gas and is received, and obtains absorption of the measurement light at the absorption line, is obtained using Beer-Lambert law
The parameters such as the concentration under test gas.DLAS technologies have many advantages, such as, such as：Response time is very short, can reach Millisecond, can
To realize continuous measurement；Measurement lower limit is low, the gas for being ppb grades available for measurement concentration；High certainty of measurement.
In DLAS technologies, the selection of under test gas absorption line is most important for measuring, and directly influences measurement
Important indicator：Measurement accuracy.
At present, in application DLAS technologies measurement methane, in the telemetering of methane in air, the absorption spectrum of methane is selected
The centre wavelength of spectral line is 1.653 μm, reference can be made to CN1204391C.
In the monitoring of non-methane total hydrocarbons, there are more background gas under test gas, such as propane, ethylene, ethyl alcohol, first
Alcohol, acetone, arene substance etc..
If still using the laser spectrum gas analyzing apparatus based on DLAS technologies, and utilize the absorption line
The content of measurement non-methane total hydrocarbons hair is gone respectively, it will be there are many technological difficulties, such as：
1. the interference between gas.In the absorption line of 1670~1675nm wave-length coverage inside points organic gas (such as methanol)
Place, the severe jamming measurement of methane greatly reduce the measurement accuracy of methane concentration.
2. sample introduction flow control is technological difficulties, due to being tested methane concentration all very littles in gas in the case of the overwhelming majority
(＜ 10ppm) thus very harsh for the sample introduction flow control requirement of laser module, sample introduction flow can directly result in measuring cell
The fluctuation of internal gas pressure, so as to cause the fluctuation of tested gas concentration numerical value.
3.FID detectors also have harsh requirement for the control of sample introduction flow, and it is unstable otherwise to will also result in hydrogen flame
Concentration data so as to cause total hydrocarbon detection is inaccurate.
Based on the presence of above-mentioned technological difficulties, the conventional laser spectrum gas analyzing apparatus based on DLAS technologies could not also
It applies in the monitoring of non-methane total hydrocarbons.
The content of the invention
In order to solve above-mentioned deficiency in the prior art, the present invention provides a kind of real-time, continuous monitoring non-methane
The device of total hydrocarbon.
To achieve the above object, the present invention uses following technical scheme：
A kind of continuous monitoring device of non-methane total hydrocarbons, the continuous monitoring device include fid detector；The continuous prison
Device is surveyed to further comprise：
Light source, for the light source for sending measurement light, the wavelength of the measurement light covers the absorption spectrum spectral line of methane；
Detection cell, the detection cell are used to accommodate under test gas；
Detector, the detector are used to that electric signal will to be converted to through the measurement light of under test gas in the detection cell,
And it is transmitted to computing module；
Computing module, the computing module are used to be handled the electric signal using absorption spectroscopy techniques and be drawn under test gas
Middle methane content, and the content of non-methane total hydrocarbons under test gas is known according to the total hydrocarbon content that the fid detector exports.
According to above-mentioned continuous monitoring device, it is preferable that the detection cell is White pond.
According to above-mentioned continuous monitoring device, it is preferable that the corresponding wavelength of absorption spectrum spectral line of the methane is
1573.7nm or 1684.0nm.
According to above-mentioned continuous monitoring device, it is preferable that the light source is laser.
According to above-mentioned continuous monitoring device, optionally, the continuous monitoring device further comprises：
Flow-control module, the flow-control module are arranged on the fid detector and/or the gas of detection cell upstream
On pipeline.
It, should the present invention also aims to provide a kind of method of work of the continuous monitoring device of above-mentioned non-methane total hydrocarbons
Goal of the invention is achieved by the following technical programs：
According to the method for work of above-mentioned continuous monitoring device, the method for work includes the following steps：
(A1) fid detector detects the total hydrocarbon content under test gas in real time
The measurement light that light source is sent is injected in detection cell, and the measurement light decayed by methane adsorption under test gas is detected
Device receives, and the electric signal of output send computing module；
(A2) computing module handles the electric signal using absorption spectroscopy techniques and draws methane content under test gas, and
The content of non-methane total hydrocarbons under test gas is continuously known according to the total hydrocarbon content that the fid detector exports.
According to above-mentioned method of work, it is preferable that the flow for being passed through the under test gas of the fid detector is controlled in
49.9-50.1ml/min。
According to above-mentioned method of work, it is preferable that the flow for being passed through the under test gas of the detection cell is controlled in 4.99-
5.01l/min。
According to above-mentioned method of work, it is preferable that under test gas is directly entered the fid detector.
Compared with prior art, the device have the advantages that being：
All technological difficulties run into when being applied the present invention overcomes DLAS technologies in non-methane total hydrocarbons continuous monitoring, such as
Absorptivity, various gases absorption line between interference, flow control the problems such as, creatively by DLAS technologies be applied to non-first
In the continuous monitoring of alkane total hydrocarbon, realize：
1. it can accurately, rapidly, continuously monitor non-methane total hydrocarbons content；
The flow for being passed through the under test gas of the detection cell is controlled in 4.99-5.01l/min, both can guarantee measuring cell
Quickly, while measurement accuracy can reach within ± the 1% of full scale response speed；
2. the appropriate selection of the absorption line of methane improves sensitivity and the precision of measurement.
Description of the drawings
Referring to the drawings, the disclosure will be easier to understand.Skilled addressee readily understands that be：This
A little attached drawings are used only for the technical solution illustrated the present invention, and are not intended to and protection scope of the present invention is construed as limiting.
In figure：
Fig. 1 is the basic block diagram of the continuous monitoring device of according to embodiments of the present invention 1 non-methane total hydrocarbons.
Specific embodiment
Fig. 1 and following description describe the present invention optional embodiment with instruct those skilled in the art how to implement and
Reproduce the present invention.In order to instruct technical solution of the present invention, simplified or some conventional aspects be omitted.Those skilled in the art should
The understanding is derived from the modification of these embodiments or replacement will within the scope of the invention.Under those skilled in the art should understand that
Stating feature can combine to form multiple modifications of the present invention in various ways.The invention is not limited in following optional as a result,
Embodiment, and be only limited by the claims and their equivalents.
Embodiment 1：
Fig. 1 schematically illustrates the basic block diagram of the continuous monitoring device of the non-methane total hydrocarbons of the embodiment of the present invention 1,
As shown in Figure 1, the continuous monitoring device includes：
Light source, such as laser, for the light source for sending measurement light, the wavelength of the measurement light covers the absorption light of methane
Spectral line is composed, such as 1573.7nm or 1684.0nm；
Detection cell, such as multiple reflections formula detection cell, the detection cell is used to accommodate under test gas；
Detector, the detector decline for that will pass through being absorbed by methane selectively under test gas in the detection cell
Measurement light after subtracting is converted to electric signal, and is transmitted to computing module；
Fid detector, the fid detector are used to detect the total hydrocarbon content under test gas, concrete structure and work side
Formula is the state of the art, and details are not described herein；
Computing module, the computing module are used to be handled the electric signal using absorption spectroscopy techniques and be drawn under test gas
Middle methane content, and the content of non-methane total hydrocarbons under test gas is known according to the total hydrocarbon content that the fid detector exports；
Pump, it is described to pump under test gas being respectively fed to the fid detector, detection cell.
In order to improve the accuracy of detection of non-methane total hydrocarbons, further, the continuous monitoring device further comprises：
Flow-control module, the flow-control module are arranged on the fid detector and/or the gas of detection cell upstream
On pipeline.
The method of work of above-mentioned continuous monitoring device, the method for work include the following steps：
(A1) fid detector detects the total hydrocarbon content under test gas in real time
The measurement light that light source is sent is injected in detection cell, and the measurement light decayed by methane adsorption under test gas is detected
Device receives, and the electric signal of output send computing module；
(A2) computing module handles the electric signal using absorption spectroscopy techniques and draws methane content under test gas, and
The content of non-methane total hydrocarbons under test gas is continuously known according to the total hydrocarbon content that the fid detector exports.
In order to improve the accuracy of detection of non-methane total hydrocarbons, further, the stream of the under test gas of the fid detector is passed through
Amount is controlled in 49.9-50.1ml/min.
In order to improve the accuracy of detection of non-methane total hydrocarbons, further, the flow of the under test gas of the detection cell is passed through
It is controlled in 4.99-5.01l/min.
Embodiment 2：
According to embodiments of the present invention 1 continuous monitoring device and its application examples of method of work.
In application examples, light source uses semiconductor laser, using wavelength-modulation technique so that the ripple of the measurement light sent
The absorption line 1573.7nm or 1684.0nm of long covering methane；Detection cell uses White pond；Under test gas passes through flow control
Enter the detection cell, specific flow such as 5l/min afterwards, control accuracy need to reach ± 10ml/min；Under test gas is through inflow-rate of water turbine control
Fid detector, specific flow such as 50ml/min are directly entered after system, control accuracy need to reach ± 0.1ml/min；Using two pumpings
Under test gas is sent into the fid detector, detection cell by air pump respectively.
The method of work of above-mentioned continuous monitoring device is：
(A1) under test gas after flow control is admitted to fid detector, detection cell respectively；
Fid detector detects the total hydrocarbon content under test gas in real time, and output signal is transmitted to computing module；
The measurement light that light source is sent is injected in detection cell, and the measurement light decayed by methane adsorption under test gas is detected
Device receives, and the electric signal of output send computing module；
(A2) computing module handles the electric signal using absorption spectroscopy techniques and draws methane content under test gas, and
The content of non-methane total hydrocarbons under test gas is continuously known according to the total hydrocarbon content that the fid detector exports.
Claims (9)
1. a kind of continuous monitoring device of non-methane total hydrocarbons, the continuous monitoring device includes fid detector；It is characterized in that：
The continuous monitoring device further comprises：
Light source, for the light source for sending measurement light, the wavelength of the measurement light covers the absorption spectrum spectral line of methane；
Detection cell, the detection cell are used to accommodate under test gas；
Detector, the detector is used to that electric signal will to be converted to through the measurement light of under test gas in the detection cell, and passes
It is sent to computing module；
Computing module, the computing module are used to be handled the electric signal using absorption spectroscopy techniques and be drawn first under test gas
Alkane content, and the content of non-methane total hydrocarbons under test gas is known according to the total hydrocarbon content that the fid detector exports.
2. continuous monitoring device according to claim 1, it is characterised in that：The detection cell light path system is White pond light
Road system.
3. continuous monitoring device according to claim 2, it is characterised in that：The absorption spectrum spectral line of the methane is corresponding
Wavelength is 1573.7nm or 1684.0nm.
4. continuous monitoring device according to claim 1, it is characterised in that：The light source is laser.
5. continuous monitoring device according to claim 1, it is characterised in that：The continuous monitoring device further comprises：
Flow-control module, the flow-control module are arranged on the fid detector and/or the gas piping of detection cell upstream
On.
6. according to the method for work of any continuous monitoring devices of claim 1-4, the method for work includes following step
Suddenly：
(A1) fid detector detects the total hydrocarbon content under test gas in real time
The measurement light that light source is sent is injected in detection cell, and the measurement light decayed by methane adsorption under test gas is connect by detector
It receives, the electric signal of output send computing module；
(A2) computing module handles the electric signal using absorption spectroscopy techniques and draws methane content under test gas, and according to
The total hydrocarbon content of fid detector output and continuously know the content of non-methane total hydrocarbons under test gas.
7. method of work according to claim 6, it is characterised in that：It is passed through the stream of the under test gas of the fid detector
Amount is controlled in 49.9-50.1ml/min.
8. method of work according to claim 6, it is characterised in that：It is passed through the flow quilt of the under test gas of the detection cell
Control is in 4.99-5.01l/min.
9. method of work according to claim 6, it is characterised in that：Under test gas is directly entered the fid detector.
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| CN106525951A (en) * | 2016-10-08 | 2017-03-22 | 苏州冷杉精密仪器有限公司 | Device and method for detecting methane content in gas |
| CN106525768A (en) * | 2016-10-08 | 2017-03-22 | 苏州冷杉精密仪器有限公司 | Non-methane total hydrocarbon detection device and detection method |
| CN110411971B (en) * | 2019-08-08 | 2021-11-23 | 大连世有电力科技有限公司 | On-line monitoring device for methane and non-methane total hydrocarbon content |
| CN110411972B (en) * | 2019-08-30 | 2021-11-30 | 中国科学院大学 | Method for simultaneously detecting concentration of total volatile organic pollutants and non-methane total hydrocarbon in gas |
| CN111879844B (en) * | 2020-07-15 | 2022-10-25 | 聚光科技(杭州)股份有限公司 | Method for detecting multiple components in gaseous pollutants |
| CN114577968A (en) * | 2020-12-02 | 2022-06-03 | 安徽皖仪科技股份有限公司 | Calibration gas circuit and calibration method of non-methane total hydrocarbon continuous monitoring system |
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| CN102749390B (en) * | 2011-04-20 | 2014-03-26 | 中国石油化工股份有限公司 | Method for determining contents of microscale allene and acetylene in MTO (methanol to olefin) products through gas chromatography |
| EP2906936B1 (en) * | 2012-10-04 | 2018-02-14 | Rae Systems, Inc. | Interference compensated photoionization detector |
| CN104297389B (en) * | 2014-10-23 | 2016-07-06 | 佛山市南海区环境保护监测站 | A kind of chromatographic analysis system |
| CN104297391B (en) * | 2014-10-23 | 2016-08-24 | 佛山市南海区环境保护监测站 | A kind of chromatographic analysis system |
| CN204514858U (en) * | 2015-03-17 | 2015-07-29 | 上海富赞信息科技有限公司 | A kind of NMHC gas detecting instrument |
| CN205067433U (en) * | 2015-09-23 | 2016-03-02 | 新疆广陆能源科技股份有限公司 | Gas chromatograph with quick analytic system |
| CN204964468U (en) * | 2015-09-30 | 2016-01-13 | 李勘 | 2 grades of freezing total hydrocarbon analysis appearance of methane / non - methane of collecting of electron refrigeration |
| CN205719955U (en) * | 2016-04-07 | 2016-11-23 | 南京波腾科技工程有限公司 | The continuous monitoring device of NMHC |
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