CN105717065A - Continuous monitoring device for non-methane total hydrocarbon and working method of continuous monitoring device - Google Patents
Continuous monitoring device for non-methane total hydrocarbon and working method of continuous monitoring device Download PDFInfo
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- CN105717065A CN105717065A CN201610214325.9A CN201610214325A CN105717065A CN 105717065 A CN105717065 A CN 105717065A CN 201610214325 A CN201610214325 A CN 201610214325A CN 105717065 A CN105717065 A CN 105717065A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012806 monitoring device Methods 0.000 title claims abstract description 34
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 20
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 20
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 230000003595 spectral effect Effects 0.000 claims abstract description 7
- 238000001179 sorption measurement Methods 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims description 29
- 238000004847 absorption spectroscopy Methods 0.000 claims description 7
- 238000000862 absorption spectrum Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 238000001228 spectrum Methods 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 54
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-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
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 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
- 238000002835 absorbance Methods 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
- 238000013375 chromatographic separation Methods 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
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
Abstract
The invention provides a continuous monitoring device for non-methane total hydrocarbon and a working method of the continuous monitoring device. The continuous monitoring device comprises an FID (flame ionization detector) and further comprises a light source, a detection cell, a detector and a computation module, wherein the light source is used for emitting measuring light, and an absorption spectral line of methane is covered with wavelength of the measuring light; the detection cell is used for accommodating to-be-measured gas; the detector is used for converting the measuring light penetrating through the to-be-measured gas in the detection cell into electrical signals, and sending the electrical signals to the computation module; the computation module is used for processing the electrical signals with an adsorption spectrum technology to obtain the methane content of the to-be-measured gas, and acquiring the content of non-methane total hydrocarbon in the to-be-measured gas according to the content of total hydrocarbon output by the FID. The continuous monitoring device has the advantages that the non-methane total hydrocarbon is monitored continuously in real time and the like.
Description
Technical field
The present invention relates to gas analysis, particularly to continuous monitoring device and the method for work thereof of NMHC.
Background technology
Current NMHC analyser is the discontinuity metering system of gas chromatography principle.It is specially and utilizes chromatographic separation technology that the methane separation in tested gas out adopts flame ionization ditector (FID) individually detect, total hydrocarbon in tested gas adopts fid detector detection simultaneously again, and then total hydrocarbon concentration draws NMHC concentration value after deducting methane concentration.Owing to adopting chromatographic column that tested gas is easily separated, and chromatographic column separates and is intended to carry out noble gas blowback later and is ready for measuring every time next time, so causing which measurement is only discontinuity detection, analysis efficiency relatively low (being generally detection in 1 to 2 minute once).
At present, the laser spectrum gas analyzing apparatus based on DLAS (DiodeLaserAbsorptionSpectroscopy) technology is widely used in gasmetry, the measurement of concetration of process gas in the fields such as iron and steel, cement, chemical industry, environmental protection.
The ultimate principle of DLAS technology is: the wavelength of light is measured in tuning so that it is correspond to the absorption line of gas to be measured；Measure light also to be received through gas to be measured, obtain measuring the light absorption at described absorption line place, utilize Beer-Lambert law to obtain the parameter such as concentration of gas to be measured.DLAS technology has plurality of advantages, as: response time is very short, it is possible to reach Millisecond, it is possible to achieve measure continuously；Measurement lower limit is low, can be used for measuring the gas that concentration is ppb level；Certainty of measurement is high.
In DLAS technology, the selection of gas absorption spectrum line to be measured is most important for measuring, and directly influences the important indicator of measurement: certainty of measurement.
At present, in application DLAS commercial measurement methane, in air in the remote measurement of methane, the centre wavelength selecting the absorption spectrum spectral line of methane is 1.653 μm, can referring to CN1204391C.
In the monitoring of NMHC, gas to be measured exists more background gas, such as propane, ethylene, ethanol, methanol, acetone, arene material etc..
If still using the described laser spectrum gas analyzing apparatus based on DLAS technology, and utilizing described absorption line to go respectively to measure the content that NMHC is sent out, will there are many technological difficulties, as:
1. the interference between gas.In the 1670～1675nm wave-length coverage absorption line place of part organic gas (such as methanol), the severe jamming measurement of methane, greatly reduce the certainty of measurement of methane concentration.
2. sample introduction flow-control is technological difficulties, owing in tested gas in overwhelming majority situation, methane concentration all only small (< 10ppm) is very harsh thus for the sample introduction flow-control requirement of laser module, sample introduction flow can directly result in the fluctuation of measuring cell internal gas pressure, thus causing the fluctuation of tested gas concentration numerical value.
3.FID detector also has harsh requirement for the control of sample introduction flow, otherwise will also result in hydrogen flame instability thus the concentration data causing total hydrocarbon to detect is inaccurate.
Based on the existence of above-mentioned technological difficulties, the conventional laser spectrum gas analyzing apparatus based on DLAS technology also could not be applied in the monitoring of NMHC.
Summary of the invention
In order to solve above shortcomings in prior art, the invention provides a kind of device real-time, monitoring NMHC continuously.
For achieving the above object, the present invention is by the following technical solutions:
The continuous monitoring device of a kind of NMHC, described continuous monitoring device includes fid detector；Described continuous monitoring device farther includes:
Light source, described light source is used for sending measurement light, and the wavelength of described measurement light covers the absorption spectrum spectral line of methane；
Detection cell, described detection cell is used for holding gas to be measured；
Detector, described detector is for being converted to the signal of telecommunication through the measurement light of gas to be measured in described detection cell, and is sent to computing module；
Computing module, described control module is used for utilizing absorption spectroscopy techniques to process the described signal of telecommunication and draw methane content in gas to be measured, and the total hydrocarbon content exported according to described fid detector and know the content of NMHC in gas to be measured.
According to above-mentioned continuous monitoring device, it is preferable that described detection cell is White pond.
According to above-mentioned continuous monitoring device, it is preferable that the wavelength that the absorption spectrum spectral line of described methane is corresponding is 1573.7nm or 1684.0nm.
According to above-mentioned continuous monitoring device, it is preferable that described light source is laser instrument.
According to above-mentioned continuous monitoring device, alternatively, described continuous monitoring device farther includes:
Flow-control module, described flow-control module is arranged on the gas piping of described fid detector and/or detection cell upstream.
The present invention also aims to provide the method for work of the continuous monitoring device of a kind of above-mentioned NMHC, this goal of the invention is achieved by the following technical programs:
Method of work according to above-mentioned continuous monitoring device, described method of work comprises the steps:
(A1) fid detector detects the total hydrocarbon content in gas to be measured in real time
The measurement light that light source sends is injected in detection cell, and the measurement light decayed by methane adsorption in gas to be measured is received by a detector, and the signal of telecommunication of output send computing module；
(A2) computing module utilizes absorption spectroscopy techniques to process the described signal of telecommunication and draw methane content in gas to be measured, and the total hydrocarbon content exported according to described fid detector and know the content of NMHC in gas to be measured continuously.
According to above-mentioned method of work, it is preferable that the flow of the gas to be measured passing into described fid detector is controlled in 49.9-50.1ml/min.
According to above-mentioned method of work, it is preferable that the flow of the gas to be measured passing into described detection cell is controlled in 4.99-5.01l/min.
According to above-mentioned method of work, it is preferable that gas to be measured is directly entered described fid detector.
Compared with prior art, the device have the advantages that into:
Instant invention overcomes all technological difficulties run into when DLAS technology is applied in during NMHC is monitored continuously, as absorbance, various gas absorption line between interference, the problem such as flow-control, creatively DLAS technology is applied in the monitoring continuously of NMHC, it is achieved that:
1. can monitor NMHC content accurately, rapidly, continuously；
The flow of the gas to be measured passing into described detection cell is controlled in 4.99-5.01l/min, both can guarantee that the response speed of measuring cell quickly, simultaneously certainty of measurement can reach full scale ± 1% within；
2. the appropriate selection of the absorption line of methane, improves sensitivity and the precision of measurement.
Accompanying drawing explanation
With reference to accompanying drawing, the disclosure will be easier to understand.Skilled addressee readily understands that: these accompanying drawings are used only for illustrating technical scheme, and are not intended to 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 the NMHC of according to embodiments of the present invention 1.
Detailed description of the invention
Fig. 1 and following description describe the optional embodiment of the present invention to instruct how those skilled in the art implement and reproduce the present invention.In order to instruct technical solution of the present invention, simplify or eliminated some conventional aspects.Those skilled in the art should understand that the modification being derived from these embodiments or replacement will within the scope of the invention.Those skilled in the art should understand that following characteristics can combine to be formed multiple modification of the present invention in every way.Thus, the invention is not limited in following optional embodiment, and only limited by claim and their equivalent.
Embodiment 1:
Fig. 1 schematically illustrates the basic block diagram of the continuous monitoring device of the NMHC of the embodiment of the present invention 1, as it is shown in figure 1, described continuous monitoring device includes:
Light source, such as laser instrument, described light source is used for sending measurement light, and the wavelength of described measurement light covers the absorption spectrum spectral line of methane, such as 1573.7nm or 1684.0nm；
Detection cell, such as multiple reflections formula detection cell, described detection cell is used for holding gas to be measured；
Detector, described detector is converted to the signal of telecommunication for the measurement light after being absorbed by methane selectively of gas to be measured in the described detection cell of traverse being decayed, and is sent to computing module；
Fid detector, described fid detector is for detecting the total hydrocarbon content in gas to be measured, and concrete structure and working method are the state of the art, do not repeat them here；
Computing module, described control module is used for utilizing absorption spectroscopy techniques to process the described signal of telecommunication and draw methane content in gas to be measured, and the total hydrocarbon content exported according to described fid detector and know the content of NMHC in gas to be measured；
Pump, described pump is for being respectively fed to described fid detector, detection cell by gas to be measured.
In order to improve the accuracy of detection of NMHC, further, described continuous monitoring device farther includes:
Flow-control module, described flow-control module is arranged on the gas piping of described fid detector and/or detection cell upstream.
The method of work of above-mentioned continuous monitoring device, described method of work comprises the steps:
(A1) fid detector detects the total hydrocarbon content in gas to be measured in real time
The measurement light that light source sends is injected in detection cell, and the measurement light decayed by methane adsorption in gas to be measured is received by a detector, and the signal of telecommunication of output send computing module；
(A2) computing module utilizes absorption spectroscopy techniques to process the described signal of telecommunication and draw methane content in gas to be measured, and the total hydrocarbon content exported according to described fid detector and know the content of NMHC in gas to be measured continuously.
In order to improve the accuracy of detection of NMHC, further, the flow of the gas to be measured passing into described fid detector is controlled in 49.9-50.1ml/min.
In order to improve the accuracy of detection of NMHC, further, the flow of the gas to be measured passing into described detection cell is controlled in 4.99-5.01l/min.
Embodiment 2:
According to embodiments of the present invention 1 continuous monitoring device and the application examples of method of work.
In application examples, light source adopts semiconductor laser, adopts wavelength-modulation technique so that the wavelength measuring light sent covers absorption line 1573.7nm or 1684.0nm of methane；Detection cell adopts White pond；Gas to be measured enters described detection cell after flow-control, and concrete flow such as 5l/min, control accuracy need to reach ± 10ml/min；Gas to be measured is directly entered fid detector after flow-control, and concrete flow such as 50ml/min, control accuracy need to reach ± 0.1ml/min；Adopt two air pumps, respectively gas to be measured is sent into described fid detector, detection cell.
The method of work of above-mentioned continuous monitoring device is:
(A1) gas to be measured after flow-control is admitted to fid detector, detection cell respectively；
Fid detector detects the total hydrocarbon content in gas to be measured in real time, and output signal is sent to computing module；
The measurement light that light source sends is injected in detection cell, and the measurement light decayed by methane adsorption in gas to be measured is received by a detector, and the signal of telecommunication of output send computing module；
(A2) computing module utilizes absorption spectroscopy techniques to process the described signal of telecommunication and draw methane content in gas to be measured, and the total hydrocarbon content exported according to described fid detector and know the content of NMHC in gas to be measured continuously.
Claims (9)
1. a continuous monitoring device for NMHC, described continuous monitoring device includes fid detector；It is characterized in that: described continuous monitoring device farther includes:
Light source, described light source is used for sending measurement light, and the wavelength of described measurement light covers the absorption spectrum spectral line of methane；
Detection cell, described detection cell is used for holding gas to be measured；
Detector, described detector is for being converted to the signal of telecommunication through the measurement light of gas to be measured in described detection cell, and is sent to computing module；
Computing module, described control module is used for utilizing absorption spectroscopy techniques to process the described signal of telecommunication and draw methane content in gas to be measured, and the total hydrocarbon content exported according to described fid detector and know the content of NMHC in gas to be measured.
2. continuous monitoring device according to claim 1, it is characterised in that: described detection cell light path system is White pond light path system.
3. continuous monitoring device according to claim 2, it is characterised in that: the wavelength that the absorption spectrum spectral line of described methane is corresponding is 1573.7nm or 1684.0nm.
4. continuous monitoring device according to claim 1, it is characterised in that: described light source is laser instrument.
5. continuous monitoring device according to claim 1, it is characterised in that: described continuous monitoring device farther includes:
Flow-control module, described flow-control module is arranged on the gas piping of described fid detector and/or detection cell upstream.
6. the method for work according to the arbitrary described continuous monitoring device of claim 1-4, described method of work comprises the steps:
(A1) fid detector detects the total hydrocarbon content in gas to be measured in real time
The measurement light that light source sends is injected in detection cell, and the measurement light decayed by methane adsorption in gas to be measured is received by a detector, and the signal of telecommunication of output send computing module；
(A2) computing module utilizes absorption spectroscopy techniques to process the described signal of telecommunication and draw methane content in gas to be measured, and the total hydrocarbon content exported according to described fid detector and know the content of NMHC in gas to be measured continuously.
7. method of work according to claim 6, it is characterised in that: the flow of the gas to be measured passing into described fid detector is controlled in 49.9-50.1ml/min.
8. method of work according to claim 6, it is characterised in that: the flow of the gas to be measured passing into described detection cell is controlled in 4.99-5.01l/min.
9. method of work according to claim 6, it is characterised in that: gas to be measured is directly entered described fid detector.
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| CN201610214325.9A CN105717065B (en) | 2016-04-07 | 2016-04-07 | The continuous monitoring device and its method of work of non-methane total hydrocarbons |
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| CN201610214325.9A CN105717065B (en) | 2016-04-07 | 2016-04-07 | The continuous monitoring device and its method of work of non-methane total hydrocarbons |
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Cited By (6)
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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 |
| CN110411971A (en) * | 2019-08-08 | 2019-11-05 | 大连世有电力科技有限公司 | A kind of on-Line Monitor Device of methane and non-methane total hydrocarbons content |
| CN110411972A (en) * | 2019-08-30 | 2019-11-05 | 中国科学院大学 | A kind of method of general volatile organic pollutant and non-methane total hydrocarbons concentration in while detection gas |
| CN111879844A (en) * | 2020-07-15 | 2020-11-03 | 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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| 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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| CN105717065B (en) | 2018-05-22 |
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