CN105738310A - Device and method for detecting concentrations of SO2, NO2 and NO in dust environment - Google Patents

Device and method for detecting concentrations of SO2, NO2 and NO in dust environment Download PDF

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Publication number
CN105738310A
CN105738310A CN201610244876.XA CN201610244876A CN105738310A CN 105738310 A CN105738310 A CN 105738310A CN 201610244876 A CN201610244876 A CN 201610244876A CN 105738310 A CN105738310 A CN 105738310A
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iraser
dust
signal
gas
head
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杨友良
曾怡帅
马翠红
孟凡伟
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North China University of Science and Technology
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North China University of Science and Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infra-red light
    • G01N21/3504Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infra-red light for analysing gases, e.g. multi-gas analysis

Abstract

The invention relates to a device and method for detecting the concentrations of SO2, NO2 and NO in a dust environment, and belongs to the technical field of gas concentration detection. According to the technical scheme, an infrared detector (4) receives infrared light signals and then carries out photovoltaic conversion, a multi-channel lock-in amplifier (5) processes received electrical signals, then converts the electrical signals into digital signals and transmits the digital signals to a software processing side (6), a dust removal correction algorithm is used when the software processing side (6) analyzes the detected digital signals so as to eliminate the influence of dust particles with known attributes in the gases on lasers, and the concentrations of the gases are measured. The device and method for detecting the concentrations of SO2, NO2 and NO in the dust environment have the advantages that the interference of known dust in the gases can be effectively removed in program simulation, the concentrations of SO2, NO2 and NO are respectively measured, the application requirement of the exhaust gas emission monitoring field in the iron and steel industry can be met, the device is low in cost, convenient to maintain and affordable, and a high-precision measuring effect can be achieved.

Description

One comprises SO containing detection in dust atmosphere2、NO2Device and method with tri-kinds of gas concentrations of NO
Technical field
The present invention relates to one and comprise SO containing detection in dust atmosphere2、NO2With the device and method of tri-kinds of gas concentrations of NO, irradiate the gas containing dust by the iraser of specific wavelength, the concentration of special component gas can be measured by the interference of dust, belong to Gas Thickness Detecting Technology field.
Background technology
At present, adopting the Infrared measurement of different wave length for different gas, the iraser wavelength of usual gasmetry is at 1300nm-8000nm, even higher.Owing to foreign technology monopolizes, there is cost height, Maintenance Difficulty, the problems such as risk in transit is big in high wavelength far infrared measurement apparatus;Domestic for SO2、NO2Gas is measured, it is proposed to using the mid-infrared laser measurement of 2000-4000nm wavelength, mid-infrared is measured economical and practical with NO tri-kinds, good safeguarding, technical threshold is relatively low, domestic develops, but, existing problems are: certainty of measurement is unable to reach the precision that far infrared is measured.For SO2、NO2Measure gas with NO tri-kinds, use the mid-infrared laser measurement of 2000-4000nm wavelength, how to obtain high-precision measurement result, be this area technical problem urgently to be resolved hurrily.
Summary of the invention
It is an object of the present invention to provide one and comprise SO containing detection in dust atmosphere2、NO2With the device and method of tri-kinds of gas concentrations of NO, process simulation can effectively be removed the interference of known dust in gas, measure SO respectively2、NO2Concentration with tri-kinds of gases of NO, it is possible to meet the application requirement in steel industry exhaust emissions monitoring field, both had with low cost, be easy to safeguard, economic and practical advantage, can obtain again high-precision measurement result, solve the problems referred to above that background technology exists.
The technical scheme is that:
One comprises SO containing detection in dust atmosphere2、NO2Device with tri-kinds of gas concentrations of NO, comprise iraser actuator, iraser head, dusty gas passage, Infrared Detectors, multichannel lock-in amplifier and software processes end, three iraser actuators are connected with respective iraser head respectively, for the wavelength of iraser head outgoing iraser is regulated and controled, the iraser of three iraser head injections is made to be stably held in the wave-length coverage of regulation;Three iraser heads are arranged in the side of dusty gas passage, and three Infrared Detectorss mated with three iraser heads are arranged in the opposite side of dusty gas passage, it is ensured that Infrared Detectors is able to receive that the iraser signal that iraser hair is penetrated;Three Infrared Detectorss are connected with three input channels of multichannel lock-in amplifier, and the output channel of multichannel lock-in amplifier is connected with software processes end.
Described dusty gas passage, is made up of high transmission rate material and equipped with the rectangular plenum of tested gas, its width is 0.8-1 rice;Described iraser head and the Infrared Detectors matched, arrange point-blank, this straight line is perpendicular to the width of rectangular plenum;Distance between iraser head and the Infrared Detectors matched is more than 1 meter, determines according to the energy of iraser, it is ensured that Infrared Detectors is able to receive that the iraser signal that iraser hair is penetrated.
Three described iraser heads, the iraser wavelength of transmitting is different, and coupling measures SO respectively2、NO2With NO gas concentration.
Described software processes end is computer.
Infrared Detectors of the present invention carries out opto-electronic conversion after receiving infrared signal, multichannel lock-in amplifier is then converted to digital signal and sends software processes end to after the signal of telecommunication received is processed, software processes end is when analyzing the digital signal detected, use dust removal correcting algorithm, eliminate the dust granules of the known attribute impact on laser in gas;No matter how dust concentration changes, as long as Infrared Detectors is able to receive that iraser signal, pass through signal processing, it is the second harmonic signal of ratio that numerical operation parses with gas concentration, just can measure the concentration of each gas, and make the concentration measurement of each gas be maintained at a stable level.
One comprises SO containing detection in dust atmosphere2、NO2With the method for tri-kinds of gas concentrations of NO, comprise the steps of:
Three iraser actuators are connected with respective iraser head respectively, for the wavelength of iraser head outgoing iraser is regulated and controled, make the iraser of three iraser head injections be stably held in the wave-length coverage of regulation;Three iraser heads are arranged in the side of dusty gas passage, and three Infrared Detectorss mated with three iraser heads are arranged in the opposite side of dusty gas passage, it is ensured that Infrared Detectors is able to receive that the iraser signal that iraser hair is penetrated;Three Infrared Detectorss are connected with three input channels of multichannel lock-in amplifier, and the output channel of multichannel lock-in amplifier is connected with software processes end;
By iraser actuator, the emergent light wavelength of three iraser heads is adjusted, makes outgoing iraser keep provision wavelengths, measure SO2Select 3974.24nm IR wavelengths, measure NO2Select 3434.45nm IR wavelengths, measure NO and select 2664.93nm IR wavelengths;On laser modulation device, record the light intensity I of iraser head outgoing iraser simultaneously;
Described dusty gas passage, is made up of high transmission rate material and equipped with the rectangular plenum of tested gas, has the dust granules of known quality M, soot density ρ, extinction coefficient K in rectangular plenum, and also having content is C1SO2, content be C2NO2It is C with content3NO;Infrared light path L is identical with rectangular plenum width;
Three Infrared Detectorss are respectively received after the iraser signal of rectangular plenum, through signal conversion, three signals of telecommunication are sent to multichannel lock-in amplifier;Three kinds of signals carry out signal analysis in different passages in multichannel lock-in amplifier, and last solution precipitates out the second harmonic signal A of each signal2fSO2、A2fNO2And A2fNO, convert second harmonic signal to digital signal, be sent to software processes end;
5. the numerical value measured above is brought into dust removal correcting algorithm formula by software processes end, not by the new harmonic wave numerical value A ' of dust interference after can being revised2fSO2、A′2fNO2With A '2fNO
6. new second harmonic numerical value A '2fLinear with gas concentration C;Again again measure after choosing gas concentration, calculate linear ratio, the gas concentration of other unknown concentration can be calculated.
Described dust removal correcting algorithm formula is:
In above-mentioned formula, A '2fAll parameters being all known constants outside degasification bulk concentration C, thus eliminating the interference of the dust second harmonic signal to extracting from optical signal, making A '2fIt is only limited by the impact of gas concentration, such that it is able to there being dirt to measure the change measuring gas concentration that environment is more stable, also just accurately measure SO2、NO2With tri-kinds of gas concentrations of NO.
Beneficial effects of the present invention: can effectively remove the interference of known dust in gas in process simulation, measure SO respectively2、NO2Concentration with tri-kinds of gases of NO, it is possible to meet steel industry exhaust emissions monitoring field application requirement, both had with low cost, be easy to safeguard, economic and practical advantage, high-precision measurement result can be obtained again.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention structural representation;
Fig. 2 is NO2Infrared absorpting light spectra;
Fig. 3 is NO infrared absorpting light spectra;
Fig. 4 is SO2Infrared absorpting light spectra;
In figure: iraser actuator 1, iraser head 2, dusty gas passage 3, Infrared Detectors 4, multichannel lock-in amplifier 5, software processes end 6.
Detailed description of the invention
The present invention will be further described by the following examples.
One comprises SO containing detection in dust atmosphere2、NO2Device with tri-kinds of gas concentrations of NO, comprise iraser actuator 1, iraser head 2, dusty gas passage 3, Infrared Detectors 4, multichannel lock-in amplifier 5 and software processes end 6, three iraser actuators 1 are connected with respective iraser head 2 respectively, for the wavelength of iraser head outgoing iraser is regulated and controled, the iraser of three iraser head injections is made to be stably held in the wave-length coverage of regulation;Three iraser heads 2 are arranged in the side of dusty gas passage 3, and three Infrared Detectorss 4 mated with three iraser heads 2 are arranged in the opposite side of dusty gas passage 3, it is ensured that Infrared Detectors is able to receive that the iraser signal that iraser hair is penetrated;Three Infrared Detectorss are connected with three input channels of multichannel lock-in amplifier, and the output channel of multichannel lock-in amplifier 5 is connected with software processes end 6.
Described dusty gas passage 3, is made up of high transmission rate material and equipped with the rectangular plenum of tested gas, its width is 0.8-1 rice;Described iraser head 2 and the Infrared Detectors 4 matched, arrange point-blank, this straight line is perpendicular to the width of rectangular plenum;Distance between iraser head 2 and the Infrared Detectors 4 matched is more than 1 meter, determines according to the energy of iraser, it is ensured that Infrared Detectors is able to receive that the iraser signal that iraser hair is penetrated.
Three described iraser heads 2, the iraser wavelength of transmitting is different, and coupling measures SO respectively2、NO2With NO gas concentration.
Described software processes end 6 is computer.
Infrared Detectors 4 of the present invention carries out opto-electronic conversion after receiving infrared signal, multichannel lock-in amplifier 5 is then converted to digital signal and sends software processes end 6 to after the signal of telecommunication received is processed, software processes end 6 is when analyzing the digital signal detected, use dust removal correcting algorithm, eliminate the dust granules of the known attribute impact on laser in gas;No matter how dust concentration changes, as long as Infrared Detectors is able to receive that iraser signal, pass through signal processing, it is the second harmonic signal of ratio that numerical operation parses with gas concentration, just can measure the concentration of each gas, and make the concentration measurement of each gas be maintained at a stable level.
One comprises SO containing detection in dust atmosphere2、NO2With the method for tri-kinds of gas concentrations of NO, comprise the steps of:
Three iraser actuators 1 are connected with respective iraser head 2 respectively, for the wavelength of iraser head outgoing iraser is regulated and controled, make the iraser of three iraser head injections be stably held in the wave-length coverage of regulation;Three iraser heads 2 are arranged in the side of dusty gas passage 3, and three Infrared Detectorss 4 mated with three iraser heads 2 are arranged in the opposite side of dusty gas passage 3, it is ensured that Infrared Detectors is able to receive that the iraser signal that iraser hair is penetrated;Three Infrared Detectorss are connected with three input channels of multichannel lock-in amplifier, and the output channel of multichannel lock-in amplifier 5 is connected with software processes end 6;
By iraser actuator, the emergent light wavelength of three iraser heads is adjusted, makes outgoing iraser keep provision wavelengths, measure SO2Select 3974.24nm IR wavelengths, measure NO2Select 3434.45nm IR wavelengths, measure NO and select 2664.93nm IR wavelengths;On laser modulation device, record the light intensity I of iraser head outgoing iraser simultaneously;
Described dusty gas passage 3, is made up of high transmission rate material and equipped with the rectangular plenum of tested gas, has the dust granules of known quality M, soot density ρ, extinction coefficient K in rectangular plenum, and also having content is C1SO2, content be C2NO2It is C with content3NO;Infrared light path L is identical with rectangular plenum width;
Three Infrared Detectorss are respectively received after the iraser signal of rectangular plenum, through signal conversion, three signals of telecommunication are sent to multichannel lock-in amplifier;Three kinds of signals carry out signal analysis in different passages in multichannel lock-in amplifier, and last solution precipitates out the second harmonic signal A of each signal2fSO2、A2fNO2And A2fNO, convert second harmonic signal to digital signal, be sent to software processes end;
5. the numerical value measured above is brought into dust removal correcting algorithm formula by software processes end, not by the new harmonic wave numerical value A ' of dust interference after can being revised2fSO2、A′2fNO2With A '2fNO
6. new second harmonic numerical value A '2fLinear with gas concentration C;Again again measure after choosing gas concentration, calculate linear ratio, the gas concentration of other unknown concentration can be calculated.
Described dust removal correcting algorithm formula is:
In above-mentioned formula, A '2fAll parameters being all known constants outside degasification bulk concentration C, thus eliminating the interference of the dust second harmonic signal to extracting from optical signal, making A '2fIt is only limited by the impact of gas concentration, such that it is able to there being dirt to measure the change measuring gas concentration that environment is more stable, also just accurately measure SO2、NO2With tri-kinds of gas concentrations of NO.
The specific embodiment of the present invention is as follows:
Infrared light is propagated in dusty gas and is limited primarily by GAS ABSORPTION and dust interference.The absorption of Infrared is obtained by gas by langbobier law:
(1)
I in formula0Penetrate and enter the incident illumination of rectangular plenum for laser instrument, unit (V) after electricity is changed;I is the emergent light received by Infrared Detectors after rectangular plenum, unit (V) after electricity is changed;P is gas pressure intensity, unit (atm);C is measured gas molar concentration, unit (mol/ (cm3Atm));L is for measuring light path, unit (cm);α is the absorptance of gas, unit (cm2/ mol).S (T) is strong for gaseous absorption line, unit (mol/cm).Above formula is carried out fourier progression expanding method, then extracts the expression formula of second harmonic coefficient and carry out after computing abbreviation obtaining equation below:
(2)
In formula, Δ v is half high half-breadth of gas correspondence absorbing wavelength;M is the index of modulation.By formula (2) relation it can be seen that the amplitude of second harmonic and the concentration of gas are linear, on this basis by namely can be applicable to measure the gas concentration of unknown concentration after the gas of concentration known is carried out ratio calibration.
Then according to lambert's Bill's dust delustring law:
(3)
Obtain I0With the relational expression of I after dust is decayed.In formula, N is molecular number;L is for measuring light path, unit (cm);D is dust granules diameter, unit (μm);K is extinction coefficient, and extinction coefficient are relevant with the particle size distribution of dust, density and birefringence, as long as dust material is determined, namely extinction coefficient can be defined as a constant.V=(π d is brought again into after molecular number N is carried out N=M/ (ρ v) conversion3)/6:
(4)
In above formula, M is dust quality, unit (g);ρ is dust granules density, unit (g/m3).Owing to the distribution of size is different, need all particle size distribution to carry out a discretization computing, nr(di) for integration Numerlcal integration coefficient after discrete, f (di) it is particle size distribution function.
Use formula (2) divided by emergent light I subsequently, finally draw equation below by a series of transformation calculations:
(5)
Formula (5) is dust removal correcting algorithm formula.According to formula (5) it can be seen that A '2fAll parameters being all known constants outside degasification bulk concentration C, thus eliminating the interference of the dust second harmonic signal to extracting from optical signal, making A '2fIt is only limited by the impact of gas concentration, such that it is able to there is being dirt to measure the change measuring gas concentration that environment is more stable.

Claims (5)

1. one kind comprises SO containing detection in dust atmosphere2、NO2Device with tri-kinds of gas concentrations of NO, it is characterized in that: comprise iraser actuator (1), iraser head (2), dusty gas passage (3), Infrared Detectors (4), multichannel lock-in amplifier (5) and software processes end (6), three iraser actuators (1) are connected with respective iraser head (2) respectively, for the wavelength of iraser head outgoing iraser is regulated and controled, the iraser of three iraser head injections is made to be stably held in the wave-length coverage of regulation;Three iraser heads (2) are arranged in the side of dusty gas passage (3), three Infrared Detectorss (4) mated with three iraser heads (2) are arranged in the opposite side of dusty gas passage (3), it is ensured that Infrared Detectors is able to receive that the iraser signal that iraser hair is penetrated;Three Infrared Detectorss are connected with three input channels of multichannel lock-in amplifier, and the output channel of multichannel lock-in amplifier (5) is connected with software processes end (6).
2. one according to claim 1 comprises SO containing detection in dust atmosphere2、NO2Device with tri-kinds of gas concentrations of NO, it is characterised in that: described dusty gas passage (3), it is made up of high transmission rate material and equipped with the rectangular plenum of tested gas, its width is 0.8-1 rice;Described iraser head (2) and the Infrared Detectors (4) matched, arrange point-blank, this straight line is perpendicular to the width of rectangular plenum;Distance between iraser head (2) and the Infrared Detectors (4) matched is more than 1 meter, determines according to the energy of iraser, it is ensured that Infrared Detectors is able to receive that the iraser signal that iraser hair is penetrated.
3. one according to claim 1 and 2 comprises SO containing detection in dust atmosphere2、NO2Device with tri-kinds of gas concentrations of NO, it is characterised in that: three described iraser heads (2), the iraser wavelength of transmitting is different, and coupling measures SO respectively2、NO2With NO gas concentration;Described software processes end (6) is computer.
4. one kind comprises SO containing detection in dust atmosphere2、NO2Method with tri-kinds of gas concentrations of NO, it is characterised in that comprise the steps of:
Three iraser actuators (1) are connected with respective iraser head (2) respectively, for the wavelength of iraser head outgoing iraser is regulated and controled, the iraser of three iraser head injections is made to be stably held in the wave-length coverage of regulation;Three iraser heads (2) are arranged in the side of dusty gas passage (3), three Infrared Detectorss (4) mated with three iraser heads (2) are arranged in the opposite side of dusty gas passage (3), it is ensured that Infrared Detectors is able to receive that the iraser signal that iraser hair is penetrated;Three Infrared Detectorss are connected with three input channels of multichannel lock-in amplifier, and the output channel of multichannel lock-in amplifier (5) is connected with software processes end (6);
By iraser actuator, the emergent light wavelength of three iraser heads is adjusted, makes outgoing iraser keep provision wavelengths, measure SO2Select 3974.24nm IR wavelengths, measure NO2Select 3434.45nm IR wavelengths, measure NO and select 2664.93nm IR wavelengths;On laser modulation device, record the light intensity I of iraser head outgoing iraser simultaneously;
Described dusty gas passage (3), is made up of high transmission rate material and equipped with the rectangular plenum of tested gas, has the dust granules of known quality M, soot density ρ, extinction coefficient K in rectangular plenum, and also having content is C1SO2, content be C2NO2It is C with content3NO;Infrared light path L is identical with rectangular plenum width;
Three Infrared Detectorss are respectively received after the iraser signal of rectangular plenum, through signal conversion, three signals of telecommunication are sent to multichannel lock-in amplifier;Three kinds of signals carry out signal analysis in different passages in multichannel lock-in amplifier, and last solution precipitates out the second harmonic signal A of each signal2fSO2、A2fNO2And A2fNO, convert second harmonic signal to digital signal, be sent to software processes end;
5. the numerical value measured above is brought into dust removal correcting algorithm formula by software processes end, not by the new harmonic wave numerical value A ' of dust interference after can being revised2fSO2、A′2fNO2With A '2fNO
6. new second harmonic numerical value A '2fLinear with gas concentration C;Again again measure after choosing gas concentration, calculate linear ratio, the gas concentration of other unknown concentration can be calculated.
5. one according to claim 4 comprises SO containing detection in dust atmosphere2、NO2Method with tri-kinds of gas concentrations of NO, it is characterised in that described dust removal correcting algorithm formula is:
In above-mentioned formula, A '2fAll parameters being all known constants outside degasification bulk concentration C, thus eliminating the interference of the dust second harmonic signal to extracting from optical signal, making A '2fIt is only limited by the impact of gas concentration, such that it is able to there being dirt to measure the change measuring gas concentration that environment is more stable, also just accurately measure SO2、NO2With tri-kinds of gas concentrations of NO.
CN201610244876.XA 2016-04-20 2016-04-20 Device and method for detecting concentrations of SO2, NO2 and NO in dust environment Pending CN105738310A (en)

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CN107621459A (en) * 2016-07-13 2018-01-23 富士电机株式会社 Gas analyzing apparatus
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CN107478593A (en) * 2017-09-26 2017-12-15 重庆大学 A kind of low concentration of NO and SO2The concentration detection method of mixed gas
CN108627435A (en) * 2018-04-26 2018-10-09 黄冈职业技术学院 It is a kind of novel based on the intelligentized room air detector of Internet of Things
CN109060706A (en) * 2018-09-21 2018-12-21 云南武易高速公路建设指挥部 A kind of atmospheric environment carbon dioxide monitoring device for highway engineering
CN109239270A (en) * 2018-09-21 2019-01-18 中国科学院地质与地球物理研究所 A kind of highway engineering atmospheric environment carbon dioxide monitoring method
CN109813639A (en) * 2019-01-07 2019-05-28 东南大学 A kind of particulate matter based on infrared light modulation techniques and gas concentration synchronous measuring apparatus and its measurement method
CN109813639B (en) * 2019-01-07 2021-09-28 东南大学 Infrared light modulation technology-based synchronous measurement device and measurement method for concentration of particulate matters and gas

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Application publication date: 20160706