CN219391798U - Monitoring system for mobile measurement of concentration and flux of industrial emission volatile organic compounds - Google Patents
Monitoring system for mobile measurement of concentration and flux of industrial emission volatile organic compounds Download PDFInfo
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 70
- 230000004907 flux Effects 0.000 title claims abstract description 52
- 238000012544 monitoring process Methods 0.000 title claims abstract description 39
- 238000005259 measurement Methods 0.000 title abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 118
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 65
- 238000000605 extraction Methods 0.000 claims abstract description 26
- 238000001157 Fourier transform infrared spectrum Methods 0.000 claims abstract description 10
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims abstract 4
- 238000010521 absorption reaction Methods 0.000 claims description 49
- 239000007789 gas Substances 0.000 claims description 43
- 238000005070 sampling Methods 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 150000001336 alkenes Chemical class 0.000 claims description 18
- 239000013307 optical fiber Substances 0.000 claims description 14
- 238000001228 spectrum Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 239000004809 Teflon Substances 0.000 claims description 9
- 229920006362 Teflon® Polymers 0.000 claims description 9
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000002329 infrared spectrum Methods 0.000 claims description 6
- 238000001658 differential optical absorption spectrophotometry Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 230000000873 masking effect Effects 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 description 20
- 150000001555 benzenes Chemical class 0.000 description 17
- WPYVAWXEWQSOGY-UHFFFAOYSA-N indium antimonide Chemical compound [Sb]#[In] WPYVAWXEWQSOGY-UHFFFAOYSA-N 0.000 description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 3
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000000411 transmission spectrum Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a monitoring system for mobile measurement of concentration and flux of industrial discharged volatile organic compounds, which comprises a mobile platform, wherein an infrared solar-masking flux system for measuring the mid-infrared absorption spectrum of the volatile organic compounds is arranged on the mobile platform, a mobile extraction type Fourier transform infrared spectrum system for measuring the infrared absorption spectrum of the volatile organic compounds and analyzing the concentration of the volatile organic compounds is arranged on the mobile platform, an open light path type differential optical absorption spectrum system or a mobile extraction type differential optical absorption spectrum system for measuring the ultraviolet absorption spectrum of the volatile organic compounds and analyzing the concentration of benzene compounds is arranged on the mobile platform, and the system also comprises a computer for analyzing data, wherein the computer is used for analyzing the column concentration of the volatile organic compounds and the volume concentration of the volatile organic compounds; the computer analyzes the ultraviolet absorption spectrum of the volatile organic compounds to obtain flux data of benzene series.
Description
Technical Field
The utility model relates to the field of environmental monitoring and optical remote sensing, in particular to a monitoring system for mobile measurement of concentration and flux of volatile organic compounds emitted by industry.
Background
Volatile organics emitted by human or natural sources are key precursors for atmospheric ozone pollution and secondary organic aerosols. The industrial park is an important source of artificial emission of volatile organic compounds, and is mainly characterized by the unorganized emission of characteristic pollutants such as alkane, alkene, arene and the like. The emission source of the volatile organic compounds in the industrial park has the characteristics of multiple emission points, wide range, dispersion, irregularity and the like, is represented as a large-surface source or a large-volume source, and is compounded with pollution weather to form complex pollution characteristics, so that the emission monitoring and control of trace organic pollution gases have great difficulty, and the accurate measurement of the concentration and flux of the volatile organic compounds has important significance in the field of industrial environment treatment.
At present, the unorganized emission monitoring of the volatile organic matters quantitatively develops from concentration monitoring to concentration and emission flux compound monitoring, and the emission flux of the volatile organic matters quantitatively develops from point monitoring and line monitoring to surface monitoring and flux monitoring on a spatial range, and is becoming the key of unorganized emission monitoring and emission list revision. To achieve mobile emission flux measurement, differential optical absorption spectroscopy techniques and infrared solar mask flux techniques have been developed; wherein, the differential optical absorption spectrum technology is generally applicable to ultraviolet-visible wave bands and has been applied to the measurement of industrial emission of nitrogen oxides and benzene series; the infrared solar energy masking flux technology generally uses a mid-infrared band and is mainly used for measuring the emission of volatile organic compounds such as alkane, alkene and the like of petrochemical enterprises.
In the prior art, as disclosed in chinese patent publication No. CN101694461a, a pollution source gas emission flux infrared multicomponent monitoring method and system includes a movable platform, a solar tracker is provided on the movable platform, an infrared spectrometer is provided in front of a light outlet of the solar tracker, an output end of the infrared spectrometer is connected with a computer, a GPS locator is further provided on the movable platform, and the GPS locator is connected to a corresponding input end of the computer.
Although the above patent can measure the concentration of the gas column, it is impossible to realize a composite measurement of the concentration of the gas column and the concentration.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model discloses a monitoring system for mobile measurement of concentration and flux of volatile organic compounds emitted by industry.
A monitoring system for mobile measurement of concentration and flux of industrial emission volatile organic compounds comprises a mobile platform, an infrared solar-masking flux system for measuring the mid-infrared absorption spectrum of the volatile organic compounds is arranged on the mobile platform,
a mobile air extraction type Fourier transform infrared spectrum system for measuring infrared absorption spectrum of volatile organic compounds and analyzing concentration of the volatile organic compounds,
an open optical path type differential optical absorption spectrum system or a movable air extraction type differential optical absorption spectrum system for measuring the ultraviolet absorption spectrum of volatile organic compounds and analyzing the concentration of benzene series,
the monitoring system further comprises a computer for analyzing data, wherein the computer is used for inverting the mid-infrared absorption spectrum of the volatile organic compounds to obtain the column concentration of the volatile organic compounds; the computer utilizes a carried fitting program to fit a group of calibration spectrums in an infrared spectrum database, and analyzes the concentration in the infrared absorption spectrum of the volatile organic matters in real time to obtain the volume concentration of the volatile organic matters; and the computer analyzes the ultraviolet absorption spectrum of the volatile organic compounds to obtain flux data of benzene series.
Preferably, the infrared solar-masking flux system comprises a solar tracker, a mid-infrared Fourier transform spectrometer, an anemograph for acquiring accurate wind speed information and a GPS for acquiring position information; the solar tracker is used for tracking the sun in real time and stably guiding the sunlight into the mid-infrared Fourier transform spectrometer;
the computer calculates the flux of the volatile organic compounds by using the wind speed information and the position information.
Preferably, the solar tracker includes a second GPS and inertial navigation system for compensating for the motion of the mobile platform.
In particular, due to the second GPS and inertial navigation system, the sun tracker can always aim at the sun when the mobile platform is in the state of steering, tilting, impacting, vibrating and the like.
Preferably, the mid-infrared fourier transform spectrometer is equipped with a liquid nitrogen cooled sandwich detector for olefins and paraffins.
Specifically, the alkene and the alkane are the main components in the volatile organic compounds, so a liquid nitrogen cooling interlayer detector for the alkene and the alkane is arranged to be suitable;
the liquid nitrogen cooling sandwich detector is an MCT detector and an InSb detector, wherein the InSb detector is between 2700 cm and 3005cm -1 The alkane is measured in the spectrum area between the two; MCT detector at 910-1000cm -1 The olefin is measured in the spectral region in between.
Preferably, the mobile air extraction type Fourier transform infrared spectrum system comprises an infrared light source, a long-optical-path absorption cell, a first air inlet system and a mid-infrared spectrometer; the first air inlet system comprises a first sample inlet and a first sampling pump, wherein the first sample inlet is used for introducing plume air from the roof through a Teflon tube, the first sample inlet is connected with the gas inlet of the long-optical-path absorption cell, and the first sampling pump is used for pumping the plume air into the long-optical-path absorption cell; the long-optical-path absorption cell is used for reflecting infrared light for multiple times and sending the infrared light into the mid-infrared spectrometer, and the total optical path of the long-optical-path absorption cell is more than 100m; and analyzing by the mid-infrared spectrometer to obtain the infrared absorption spectrum of the volatile organic compound.
In particular, the first sampling pump is required to ensure complete replacement of the gas in the long path absorber cell within a few seconds.
Preferably, the mobile air extraction fourier transform infrared spectroscopy system further comprises an interference source rejection module that looks at exhaust gas compound signatures based on real-time monitored emission plumes, filtering out unwanted signals from local traffic exhaust gas or from the measuring vehicle itself.
Specifically, the interference source elimination module monitors the emission plume in real time and judges whether any interference source is being sampled; by looking at exhaust gas compound characteristics, such as carbon monoxide concentration, unwanted signals from local traffic exhaust or from the measuring vehicle itself can be filtered out.
Preferably, the open light path type differential optical absorption spectrum system comprises an ultraviolet lamp, an open optical air chamber, a bifurcated optical fiber bundle and a differential optical absorption spectrometer which are connected in sequence; the ultraviolet lamp is used for emitting ultraviolet rays to the open optical air chamber, the ultraviolet rays are reflected for multiple times in the open optical air chamber, part of the ultraviolet rays are absorbed by gas in the open optical air chamber to obtain a total optical path of more than 200m, and the branched optical fiber bundle receives a light optimizing optical path emitted by the open optical air chamber to enable the light optimizing optical path to pass through a slit of the spectrometer and enter the differential optical absorption spectrometer; and the differential optical absorption spectrometer analyzes the ultraviolet light to obtain an ultraviolet absorption spectrum of the volatile organic compounds.
Preferably, the mobile air extraction type differential optical absorption spectrum system comprises an ultraviolet lamp, a closed optical air chamber, a second air inlet system and a differential optical absorption spectrometer; the second air inlet system comprises a second sample inlet and a second sampling pump, wherein the second sample inlet is used for introducing plume air from the roof through a Teflon tube, the second sample inlet is connected with the gas inlet of the closed optical air chamber, and the second sampling pump is used for extracting the plume air into the closed optical air chamber; the closed optical air chamber is used for reflecting ultraviolet rays for a plurality of times and sending the ultraviolet rays into the differential optical absorption spectrometer, and the total optical path length of the closed optical air chamber is more than 100m; the branched optical fiber bundle receives a light optimizing light path emitted by the closed optical air chamber, and the light optimizing light path passes through a slit of the spectrometer and enters a differential optical absorption spectrometer; and the differential optical absorption spectrometer analyzes the ultraviolet light to obtain an ultraviolet absorption spectrum of the volatile organic compounds.
Preferably, the wavelength of the ultraviolet lamp is 255-285nm.
Preferably, the mobile air extraction type differential optical absorption spectrum system always maintains a constant temperature state.
Specifically, the mobile air extraction type differential optical absorption spectrum system in a constant temperature state can maintain optimal performance, has good stability, and meanwhile, the closed optical air chamber unit and the system have stable temperature and can provide good detection limit.
Compared with the prior art, the utility model has the following advantages:
the monitoring system combines the advantages of an infrared solar-masking flux technology and a differential optical absorption spectrum technology, and utilizes the infrared solar-masking flux technology to measure the column concentration and flux of trace pollution gas on a mobile platform based on an optical remote sensing technology; measuring the concentration of the polluted gas by using a mobile extraction type Fourier transform infrared spectrum system; the concentration of benzene series is measured and the flux is calculated by using an open light path type differential optical absorption spectrum system or a movable air suction type differential optical absorption spectrum system, namely, the real-time compound monitoring of alkane, alkene and benzene series concentration, column concentration, gas emission flux and pollution gas plume height can be realized, meanwhile, three subsystems can be cooperated by different work, hot spots or large-area leakage can be effectively screened, and the ground gas concentrations of different sources can be drawn on a map, so that the monitoring system has important significance for monitoring and evaluating the field pollution gas emission of a large pollution source.
Drawings
FIG. 1 is a schematic diagram of a monitoring system for mobile measurement of concentration and flux of volatile organic compounds emitted from industrial applications according to embodiment 1 of the present utility model;
fig. 2 is a schematic diagram of a monitoring system for mobile measurement of concentration and flux of volatile organic compounds emitted from industrial industries according to embodiment 2 of the present utility model.
Detailed Description
The utility model will be further described with reference to the drawings and specific examples.
Example 1
As shown in fig. 1, the monitoring system for mobile measurement of concentration and flux of volatile organic compounds emitted from industry comprises a mobile platform on which an infrared mask solar flux system 10 for measuring mid-infrared absorption spectrum of volatile organic compounds is provided,
a mobile air-extracting fourier transform infrared spectroscopy system 20 for measuring infrared absorption spectra of volatile organic compounds and analyzing concentrations of volatile organic compounds,
an open optical path type differential optical absorption spectrum system 31 for measuring ultraviolet absorption spectrum of volatile organic compounds and analyzing the concentration of benzene series,
the monitoring system further comprises a computer 40 for analyzing data, wherein the computer 40 is used for inverting the mid-infrared absorption spectrum of the volatile organic compounds to obtain the column concentration of the volatile organic compounds; the computer 40 utilizes the carried fitting program to fit a group of calibration spectrums in the infrared spectrum database, and analyzes the concentration in the infrared absorption spectrum of the volatile organic matters in real time to obtain the volume concentration of the volatile organic matters; the computer 40 analyzes the ultraviolet absorption spectrum of the volatile organic compounds to obtain flux data for benzene series.
The infrared mask solar flux system 10 includes a solar tracker, a mid-infrared fourier transform spectrometer, an anemometer for obtaining accurate wind speed information, and a GPS for obtaining position information; the solar tracker is used for tracking the sun in real time and stably guiding sunlight into the mid-infrared Fourier transform spectrometer;
the computer 40 calculates the flux of the volatile organic compounds using the wind speed information and the position information.
The solar tracker includes a second GPS and inertial navigation system for compensating for the motion of the mobile platform.
With the second GPS and inertial navigation system, the sun tracker is always aligned with the sun when the mobile platform is in a steering, tilting, jerking, vibrating, etc. state.
The mid-infrared fourier transform spectrometer was equipped with a liquid nitrogen cooled sandwich detector for olefins and paraffins.
The alkene and alkane are both the main components in the volatile organic matter, so a liquid nitrogen cooled sandwich detector for the alkene and alkane is provided to be suitable;
the liquid nitrogen cooling sandwich detector is MCT detector and InSb detector, wherein the InSb detector is between 2700 cm and 3005cm -1 The alkane is measured in the spectrum area between the two; MCT detector at 910-1000cm -1 The olefin is measured in the spectral region in between.
The mobile extraction type Fourier transform infrared spectrum system 20 comprises an infrared light source, a long-optical-path absorption cell, a first air inlet system and a mid-infrared spectrometer; the first air inlet system comprises a first sample inlet and a first sampling pump, wherein the first sample inlet is used for introducing plume air from the roof through a Teflon tube, the first sample inlet is connected with the gas inlet of the long-optical-path absorption cell, and the first sampling pump is used for pumping the plume air into the long-optical-path absorption cell; the long-optical-path absorption cell is used for reflecting infrared light for multiple times and sending the infrared light into the mid-infrared spectrometer, and the total optical path of the long-optical-path absorption cell is more than 100m; and analyzing by a mid-infrared spectrometer to obtain the infrared absorption spectrum of the volatile organic compound.
The first sampling pump is required to ensure complete replacement of the gas in the long path absorber cell within a few seconds.
The mobile extraction fourier transform infrared spectroscopy system 20 also includes an interference source rejection module that looks at exhaust gas compound signatures based on real-time monitored emission plumes, filtering out unwanted signals from local traffic exhaust or from the measuring vehicle itself.
The open light path type differential optical absorption spectrum system 31 comprises an ultraviolet lamp, an open optical air chamber, a bifurcated optical fiber bundle and a differential optical absorption spectrometer, wherein the open optical air chamber, the bifurcated optical fiber bundle and the differential optical absorption spectrometer are connected in sequence; the ultraviolet lamp is used for emitting ultraviolet rays to the open optical air chamber, the ultraviolet rays are reflected for many times in the open optical air chamber and are partially absorbed by gas in the open optical air chamber to obtain a total optical path which is more than 200m, and the branched optical fiber bundle receives a light optimizing optical path emitted by the open optical air chamber so that the light optimizing optical path passes through a slit of the spectrometer and enters the differential optical absorption spectrometer; and the differential optical absorption spectrometer analyzes the ultraviolet light to obtain the ultraviolet absorption spectrum of the volatile organic compounds.
The wavelength of ultraviolet lamp is 255-285nm.
Example 2
As shown in fig. 2, the monitoring system for mobile measurement of concentration and flux of volatile organic compounds emitted from industry comprises a mobile platform on which an infrared mask solar flux system 10 for measuring mid-infrared absorption spectrum of volatile organic compounds is provided,
a mobile air-extracting fourier transform infrared spectroscopy system 20 for measuring infrared absorption spectra of volatile organic compounds and analyzing concentrations of volatile organic compounds,
a mobile pumped differential optical absorption spectroscopy system 32 for measuring ultraviolet absorption spectra of volatile organic compounds and analyzing the concentration of benzene series,
the monitoring system further comprises a computer 40 for analyzing data, wherein the computer 40 is used for inverting the mid-infrared absorption spectrum of the volatile organic compounds to obtain the column concentration of the volatile organic compounds; the computer 40 utilizes the carried fitting program to fit a group of calibration spectrums in the infrared spectrum database, and analyzes the concentration in the infrared absorption spectrum of the volatile organic matters in real time to obtain the volume concentration of the volatile organic matters; the computer 40 analyzes the ultraviolet absorption spectrum of the volatile organic compounds to obtain flux data for benzene series.
The infrared mask solar flux system 10 includes a solar tracker, a mid-infrared fourier transform spectrometer, an anemometer for obtaining accurate wind speed information, and a GPS for obtaining position information; the solar tracker is used for tracking the sun in real time and stably guiding sunlight into the mid-infrared Fourier transform spectrometer;
the computer 40 calculates the flux of the volatile organic compounds using the wind speed information and the position information.
The solar tracker includes a second GPS and inertial navigation system for compensating for the motion of the mobile platform.
With the second GPS and inertial navigation system, the sun tracker is always aligned with the sun when the mobile platform is in a steering, tilting, jerking, vibrating, etc. state.
The mid-infrared fourier transform spectrometer was equipped with a liquid nitrogen cooled sandwich detector for olefins and paraffins.
The alkene and alkane are both the main components in the volatile organic matter, so a liquid nitrogen cooled sandwich detector for the alkene and alkane is provided to be suitable;
the liquid nitrogen cooling sandwich detector is MCT detector and InSb detector, wherein the InSb detector is between 2700 cm and 3005cm -1 The alkane is measured in the spectrum area between the two; MCT detector at 910-1000cm -1 The olefin is measured in the spectral region in between.
The mobile extraction type Fourier transform infrared spectrum system 20 comprises an infrared light source, a long-optical-path absorption cell, a first air inlet system and a mid-infrared spectrometer; the first air inlet system comprises a first sample inlet and a first sampling pump, wherein the first sample inlet is used for introducing plume air from the roof through a Teflon tube, the first sample inlet is connected with the gas inlet of the long-optical-path absorption cell, and the first sampling pump is used for pumping the plume air into the long-optical-path absorption cell; the long-optical-path absorption cell is used for reflecting infrared light for multiple times and sending the infrared light into the mid-infrared spectrometer, and the total optical path of the long-optical-path absorption cell is more than 100m; and analyzing by a mid-infrared spectrometer to obtain the infrared absorption spectrum of the volatile organic compound.
The first sampling pump is required to ensure complete replacement of the gas in the long path absorber cell within a few seconds.
The mobile extraction fourier transform infrared spectroscopy system 20 also includes an interference source rejection module that looks at exhaust gas compound signatures based on real-time monitored emission plumes, filtering out unwanted signals from local traffic exhaust or from the measuring vehicle itself.
The mobile extraction type differential optical absorption spectrum system 32 comprises an ultraviolet lamp, a closed optical air chamber, a second air inlet system and a differential optical absorption spectrometer; the second air inlet system comprises a second sample inlet and a second sampling pump, wherein the second sample inlet is used for introducing plume air from the roof through a Teflon tube, the second sample inlet is connected with the gas inlet of the closed optical gas chamber, and the second sampling pump is used for pumping the plume air into the closed optical gas chamber; the closed optical air chamber is used for reflecting ultraviolet rays for a plurality of times and sending the ultraviolet rays into the differential optical absorption spectrometer, and the total optical path length of the closed optical air chamber is more than 100m; the split optical fiber bundle receives a light optimizing light path emitted by the closed optical air chamber, and the light optimizing light path passes through a slit of the spectrometer and enters a differential optical absorption spectrometer; and the differential optical absorption spectrometer analyzes the ultraviolet light to obtain the ultraviolet absorption spectrum of the volatile organic compounds.
The wavelength of ultraviolet lamp is 255-285nm.
The mobile extraction differential optical absorption spectroscopy system 32 remains at a constant temperature throughout.
The mobile pumped differential optical absorption spectroscopy system 32 maintained at a constant temperature can maintain optimal performance with good stability while the closed optical plenum unit and system temperature are stable to provide good detection limits.
When the infrared spectrum detection device is particularly used, a monitoring area is determined in advance, a solar tracker tracks the sun in real time, infrared radiation of the sun is led into a mid-infrared Fourier transform spectrometer, a background spectrum and a transmission spectrum emitted from the solar tracker are measured successively, and a difference value between the background spectrum and the transmission spectrum is calculated to obtain a mid-infrared absorption spectrum of the volatile organic compound; the computer 40 inverts the mid-infrared absorption spectrum of the volatile organic compounds by an inversion algorithm to obtain the column concentration of the volatile gases (alkanes and alkenes), which is defined as the integral of the volume concentration in the vertical direction in kg/m 2 ；
The infrared mask solar flux system 10 is carried on a mobile platform to move and monitor one circle along a monitoring area, so that column concentration information of each point on a path can be obtained, and a synchronous monitoring step can be carried out on discharge flux, specifically, the gas column concentration is measured in the moving process from one place to another place, an anemograph and GPS data are synchronously acquired, the distance between the two places is calculated according to the GPS data, the measured gas column concentration is integrated with the distance between the two places, the line concentration of gas passing through a vertical section is obtained, the line concentration of gas passing through the vertical section is multiplied by wind speed, and the flux of gas passing through the vertical section in unit time, namely the gas discharge rate, is obtained.
The sample inlet of the mobile air extraction type Fourier transform infrared spectrum system 20 introduces plume air from the roof through a Teflon tube, a sampling pump pumps the detected air into a long-path absorption cell, the long-path absorption cell is used for reflecting infrared light for multiple times to obtain long-path length, an InSb detector and an MCT detector are used for detecting emergent light simultaneously by a mid-infrared spectrometer to obtain infrared absorption spectrum of volatile organic matters, a set of calibration spectrums in an infrared spectrum database are fitted through a fitting program, concentration in the spectrums is analyzed in real time, volume concentration of volatile organic compounds such as alkane, alkene and the like in a cavity is detected and quantified, the volume concentration is defined as gas component mass in unit volume, and the unit is kg/m 3 The mobile extraction fourier transform infrared spectroscopy system 20 is mounted on a mobile platform and used in conjunction with the simultaneous infrared mask solar flux system 10 measurement, the plume height can be estimated by dividing the measured column concentration by the volume concentration, resulting in a more detailed plume volatile organic morphology. During the monitoring process, the sampling pump needs to ensure that the gas volume in the long-path absorption cell is completely replaced within a few seconds, and then the infrared absorption spectrum of the volatile organic compounds is recorded in 10-15 seconds, so that the spectrum data are analyzed in real time and the volume concentration information is obtained.
Ultraviolet light emitted by an ultraviolet lamp in the open optical path type differential optical absorption spectrum system 31 is transmitted into an open optical air chamber through an optical fiber/transmission optical device, the ultraviolet light is reflected for multiple times in the open optical air chamber to obtain the total optical path length of more than 200m, and the optical path is optimized by a bifurcated optical fiber bundle to pass through a slit of a spectrometer; the differential optical absorption spectrometer analyzes the ultraviolet light and detects and quantifies benzene series in the chamber using the ultraviolet wavelength region of 255-285nm. The second air inlet system of the movable air-extraction type differential optical absorption spectrum system 32 comprises a second sample inlet and a second sampling pump, wherein the second sample inlet is used for introducing plume air from the roof through a Teflon tube, the second sample inlet is connected with the gas inlet of the closed optical air chamber, the second sampling pump is used for extracting the plume air into the closed optical air chamber, and the closed optical air chamber is used for reflecting ultraviolet rays for multiple times and sending the ultraviolet rays into the differential optical absorption spectrum instrument; the total optical path length of the closed optical air chamber is more than 100m; the split optical fiber bundle receives a light optimizing light path emitted by the closed optical air chamber, and the light optimizing light path passes through a slit of the spectrometer and enters a differential optical absorption spectrometer; and the differential optical absorption spectrometer analyzes the ultraviolet light to obtain the ultraviolet absorption spectrum of the volatile organic compounds.
The measurement computer 40 processes the on-line evaluation of the spectra to obtain benzene series emission flux data, provide plume location and composition information, and combine the obtained data with corresponding mobile extraction Fourier transform infrared spectrum data to produce a plume specific benzene series/alkane mass ratio. Then, the mass ratio of benzene series to alkane is used for calculating the aromatic hydrocarbon flux of each subarea, the specific area plumes can be detected for many times due to the fact that the distribution of benzene series components is different from source to source, the overall average value of the benzene series to alkane ratios of all plumes is obtained, then the mass ratio of benzene series to alkane is used for calculating the aromatic hydrocarbon flux of each subarea, and the specific benzene series source is determined according to the specific calculation formula:
where k is the number of measurements of the gas ratio, N BTEX Is the volume concentration of benzene series, N ane Is the volume concentration of alkane, Q ane Is the average emission flux, Q, of alkane measured by the infrared mask solar flux system 10 BTEX Is the resulting benzene-based effluent flux, l is the distance travelled through the plume.
Claims (6)
1. The utility model provides a remove monitoring system who measures industrial emission volatile organic compounds concentration and flux, includes moving platform, its characterized in that is equipped with on the moving platform:
an infrared solar masking flux system for measuring the mid-infrared absorption spectrum of volatile organic compounds,
a mobile air extraction type Fourier transform infrared spectrum system for measuring infrared absorption spectrum of volatile organic compounds and analyzing concentration of the volatile organic compounds,
an open optical path type differential optical absorption spectrum system or a movable air extraction type differential optical absorption spectrum system for measuring the ultraviolet absorption spectrum of volatile organic compounds and analyzing the concentration of benzene series,
the monitoring system further comprises a computer for analyzing data, wherein the computer is used for inverting the mid-infrared absorption spectrum of the volatile organic compounds to obtain the column concentration of the volatile organic compounds; the computer utilizes a carried fitting program to fit a group of calibration spectrums in an infrared spectrum database, and analyzes the concentration in the infrared absorption spectrum of the volatile organic matters in real time to obtain the volume concentration of the volatile organic matters; the computer analyzes the ultraviolet absorption spectrum of the volatile organic compounds to obtain flux data of benzene series,
the infrared sun-shading flux system comprises a sun tracker, a middle infrared Fourier transform spectrometer, an anemograph for acquiring accurate wind speed information and a first GPS for acquiring position information; the solar tracker is used for tracking the sun in real time and stably guiding the sunlight into the mid-infrared Fourier transform spectrometer;
the computer calculates the flux of the volatile organic compounds by using the wind speed information and the position information,
the mobile air extraction type Fourier transform infrared spectrum system comprises an infrared light source, a long-optical-path absorption cell, a first air inlet system and a mid-infrared spectrometer; the first air inlet system comprises a first sample inlet and a first sampling pump, wherein the first sample inlet is used for introducing plume air from the roof through a Teflon tube, the first sample inlet is connected with the gas inlet of the long-optical-path absorption cell, and the first sampling pump is used for pumping the plume air into the long-optical-path absorption cell; the long-optical-path absorption cell is used for reflecting infrared light for multiple times and sending the infrared light into the mid-infrared spectrometer, and the total optical path of the long-optical-path absorption cell is more than 100m; the mid-infrared spectrometer analyzes to obtain the infrared absorption spectrum of the volatile organic compound,
the open light path type differential optical absorption spectrum system comprises an ultraviolet lamp, an open optical air chamber, a bifurcated optical fiber bundle and a differential optical absorption spectrometer, wherein the open optical air chamber, the bifurcated optical fiber bundle and the differential optical absorption spectrometer are connected in sequence; the ultraviolet lamp is used for emitting ultraviolet rays to the open optical air chamber, the ultraviolet rays are reflected for multiple times in the open optical air chamber, part of the ultraviolet rays are absorbed by gas in the open optical air chamber to obtain a total optical path of more than 200m, and the branched optical fiber bundle receives a light optimizing optical path emitted by the open optical air chamber to enable the light optimizing optical path to pass through a slit of the spectrometer and enter the differential optical absorption spectrometer; the differential optical absorption spectrometer analyzes the ultraviolet light to obtain the ultraviolet absorption spectrum of the volatile organic compounds,
the movable air extraction type differential optical absorption spectrum system comprises an ultraviolet lamp, a closed optical air chamber, a second air inlet system and a differential optical absorption spectrometer; the second air inlet system comprises a second sample inlet and a second sampling pump, wherein the second sample inlet is used for introducing plume air from the roof through a Teflon tube, the second sample inlet is connected with the gas inlet of the closed optical air chamber, and the second sampling pump is used for extracting the plume air into the closed optical air chamber; the closed optical air chamber is used for reflecting ultraviolet rays for a plurality of times and sending the ultraviolet rays into the differential optical absorption spectrometer, and the total optical path length of the closed optical air chamber is more than 100m; the branched optical fiber bundle receives a light optimizing light path emitted by the closed optical air chamber, and the light optimizing light path passes through a slit of the spectrometer and enters a differential optical absorption spectrometer; and the differential optical absorption spectrometer analyzes the ultraviolet light to obtain an ultraviolet absorption spectrum of the volatile organic compounds.
2. The monitoring system of claim 1, wherein the solar tracker includes a second GPS and inertial navigation system for compensating for the motion of the mobile platform.
3. The monitoring system of claim 1, wherein the mid-infrared fourier transform spectrometer is equipped with a liquid nitrogen cooled sandwich detector for olefins and paraffins.
4. The monitoring system of claim 1, wherein the mobile extraction fourier transform infrared spectroscopy system further comprises an interference source rejection module that looks at exhaust gas compound signatures based on real-time monitored emission plumes, filtering out unwanted signals from local traffic exhaust gas or from the measuring vehicle itself.
5. The monitoring system of claim 1, wherein the ultraviolet radiation lamp has a wavelength of 255-285nm.
6. The monitoring system of claim 1, wherein the mobile extraction differential optical absorption spectroscopy system remains at a constant temperature throughout.
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