CN1766569A - Nitrogen dioxide gas concentration monitoring system and monitoring method thereof - Google Patents
Nitrogen dioxide gas concentration monitoring system and monitoring method thereof Download PDFInfo
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- CN1766569A CN1766569A CN 200510010501 CN200510010501A CN1766569A CN 1766569 A CN1766569 A CN 1766569A CN 200510010501 CN200510010501 CN 200510010501 CN 200510010501 A CN200510010501 A CN 200510010501A CN 1766569 A CN1766569 A CN 1766569A
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Abstract
The invention relates to a system and method for monitoring nitrogen oxide density. The system is formed by an illuminate diode 1, a number one convex lens 2, a air channel 3, a number two convex lens 4, a spectrograph 5 and a computer 6, wherein 1 sends the light which is through 2,3,4 and into the light testing input end of 5; the data receiving unit of the tested gas of 6 from 5 can get the peak value I (lambda 1)which is adjacent to the wavelength Anm and the alcove value I (lambda 2) unit of the spectrum; it also can substitute the lambda 1 and lambda 2 into the formula N=-Ln[I(lambda 1)/I(lambda 2)]/{[sigma (lambda 1)-sigma (lambda 2)]*L} to compute NO2 density. The method is formed by spectrum extracting step and NO2 density computing step.
Description
Technical field
The present invention relates to the concentration monitor system of nitrogen dioxide gas, the invention still further relates to the concentration monitoring method of nitrogen dioxide gas.
Background technology
Along with expanding economy, being discharged into airborne nitrogen dioxide constantly increases.The pollutants such as nitrogen dioxide of coal-fired power station boiler discharging as not controlled, will be caused serious urban air pollution and environmental pollution.Therefore, imperative to the on-line monitoring of coal-fired power station boiler pollutant emission.The technology that realizes online gas-monitoring at present mainly contains difference absorption spectrum (DOAS) technology and laser radar (LIDAR) technology.Wherein, the general applied optics parametric oscillator of DOAS technology is as emissive source, and the costing an arm and a leg of optical parametric oscillator, and this technology is to spectroscopic instruments, and the requirement of sensitive detection parts is very high, so cause the cost of equipment set very high.And LIDAR equipment price costliness, generally in up to ten million units, the equipment maintenance cost of LIDAR is also very high, so it seldom is used for the real-time monitoring to dusty gas, mainly as the generaI investigation of dusty gas.
Summary of the invention
The purpose of this invention is to provide a kind of nitrogen dioxide gas concentration monitoring system, to overcome the defective that the conventional online gas controlling device costs an arm and a leg, maintenance cost is high.Air inclusion passage of the present invention, it also comprises light emitting diode, convex lens, No. two convex lens, spectrograph, computing machine; Convex lens, gas passage and No. two convex lens are between light emitting diode and spectrograph and make light that light emitting diode sends detect input end by the light that convex lens, gas passage and No. two convex lens are input to spectrograph successively, and the data output end of spectrograph connects the data input pin of computing machine; Computing machine by the Data Receiving unit that obtains tested gaseous spectrum from spectrograph, can be spectrum the adjacent peak I (λ that gets ripple nearby with wavelength Anm
1) and valley I (λ
2) the value unit and the peak I (λ of ripple
1) and valley I (λ
2) bring N=-Ln[I (λ into
1) ÷ I (λ
2)] ÷ { [σ (λ
1)-σ (λ
2)] * calculate NO in the L} formula
2The computing unit of gas concentration is formed, the σ (λ in the formula
1) be NO
2In wavelength X
1The absorption cross section value at place, σ (λ
2) be NO
2In wavelength X
2The absorption cross section value at place, L is the distance that light is advanced in gas passage, N is NO in the gas passage
2The mean concentration of gas, the value of described wavelength A are any one numerical value in 420～460 numerical value intervals.The light emitting diode price of using among the present invention as light source is very cheap, therefore greatly reduces the cost (the about hundreds of thousands of the present invention unit) of apparatus of the present invention, and is simple in structure, therefore easy to maintenance.That the present invention has is simple in structure, easy to operate, cost is low, advantage of high precision, can be online to NO
2The concentration of gas is monitored.
The present invention also provides the monitoring method that is applied to nitrogen dioxide gas concentration monitoring system.It is made up of following steps: one, spectrum extraction step: make nitrogen dioxide gas inflow gas passage, make light that light emitting diode sends detect input end by the light that convex lens, gas passage and No. two convex lens are input to spectrograph successively simultaneously, spectrograph extracts spectrum; Two, NO
2Gas concentration calculation procedure: receive the spectrum that spectrograph extracts by the Data Receiving unit in the computing machine; Then by the adjacent peak I (λ that gets ripple nearby with wavelength Anm in spectrum of the value unit in the computing machine
1) and valley I (λ
2), the value of described wavelength A is any one numerical value in 420～460 numerical value intervals; Then pass through the interior computing unit of computing machine the peak I (λ of ripple
1) and valley I (λ
2) bring N=-Ln[I (λ into
1) ÷ I (λ
2)] ÷ { [σ (λ
1)-σ (λ
2)] * calculate NO in the L} formula
2Gas concentration, the σ (λ in the formula
1) be NO
2In wavelength X
1The absorption cross section value at place, σ (λ
2) be NO
2In wavelength X
2The absorption cross section value at place, L is the distance that light is advanced in gas passage, N is NO in the gas passage 3
2The mean concentration of gas.
Description of drawings
Fig. 1 is a system architecture synoptic diagram of the present invention, and Fig. 2 is the spectrum synoptic diagram that spectrograph 5 obtains.
Embodiment
Embodiment one: specify present embodiment in conjunction with Fig. 1 and Fig. 2, present embodiment is made up of light emitting diode 1, convex lens 2, gas passage 3, No. two convex lens 4, spectrograph 5, computing machines 6; Convex lens 2, gas passage 3 and No. two convex lens 4 are between light emitting diode 1 and spectrograph 5 and make light that light emitting diode 1 sends detect input end by the light that convex lens 2, gas passage 3 and No. two convex lens 4 are input to spectrograph 5 successively, and the data output end of spectrograph 5 connects the data input pin of computing machine 6; Computing machine 6 by the Data Receiving unit 6-1 that obtains tested gaseous spectrum from spectrograph 5, can be spectrum the adjacent peak I (λ that gets ripple nearby with wavelength Anm
1) and valley I (λ
2) value unit 6-2 and the peak I (λ of ripple
1) and valley I (λ
2) bring N=-Ln[I (λ into
1) ÷ I (λ
2)] ÷ { [σ (λ
1)-σ (λ
2)] * calculate NO in the L} formula
2The computing unit 6-3 of gas concentration forms, the σ (λ in the formula
1) be NO
2In wavelength X
1The absorption cross section value at place, σ (λ
2) be NO
2In wavelength X
2The absorption cross section value at place is respectively NO
2In wavelength X
1And λ
2The physics constant at place.L is the distance that light is advanced in gas passage 3, and N is NO in the gas passage 3
2The mean concentration of gas, the value of described wavelength A are any one numerical value in 420～460 numerical value intervals.The best value of described wavelength A is 440nm.What light emitting diode 1 was selected for use is light emitting diode, and convex lens 2, No. two convex lens 4 are all selected quartz lens for use, and spectrograph 5 is selected the product of the U.S. HR2000 of oceanoptics company model for use,
Embodiment two: specify present embodiment in conjunction with Fig. 1 and Fig. 2, present embodiment is made up of following steps: one, spectrum extraction step: make nitrogen dioxide gas inflow gas passage 3, make light that light emitting diode 1 sends detect input end by the light that convex lens 2, gas passage 3 and No. two convex lens 4 are input to spectrograph 5 successively simultaneously, spectrograph 5 extracts spectrum; Two, NO
2Gas concentration calculation procedure: receive the spectrum that spectrograph 5 extracts by the Data Receiving unit 6-1 in the computing machine 6; Then by the value unit 6-2 adjacent peak I (λ that gets ripple nearby with wavelength Anm in spectrum in the computing machine 6
1) and valley I (λ
2), the value of described wavelength A is any one numerical value in 420～460 numerical value intervals; Follow by the computing unit 6-3 in the computing machine 6 the peak I (λ of ripple
1) and valley I (λ
2) bring N=-Ln[I (λ into
1) ÷ I (λ
2)] ÷ { [σ (λ
1)-σ (λ
2)] * calculate NO in the L} formula
2Gas concentration, the σ (λ in the formula
1) be NO
2In wavelength X
1The absorption cross section value at place, σ (λ
2) be NO
2In wavelength X
2The absorption cross section value at place, L is the distance that light is advanced in gas passage 3, N is NO in the gas passage 3
2The mean concentration of gas.
Claims (3)
1, nitrogen dioxide gas concentration monitoring system, its air inclusion passage (3) is characterized in that it also comprises light emitting diode (1), convex lens (2), No. two convex lens (4), spectrograph (5), computing machine (6); Convex lens (2), gas passage (3) and No. two convex lens (4) are positioned between light emitting diode (1) and the spectrograph (5) and make light that light emitting diode (1) sends detect input end by the light that convex lens (2), gas passage (3) and No. two convex lens (4) are input to spectrograph (5) successively, and the data output end of spectrograph (5) connects the data input pin of computing machine (6); Computing machine (6) by the Data Receiving unit (6-1) that obtains tested gaseous spectrum from spectrograph (5), can be spectrum the adjacent peak I (λ that gets ripple nearby with wavelength Anm
1) and valley I (λ
2) value unit (6-2) and the peak I (λ of ripple
1) and valley I (λ
2) bring N=-Ln[I (λ into
1) ÷ I (λ
2)] ÷ { [σ (λ
1)-σ (λ
2)] * calculate NO in the L} formula
2The computing unit of gas concentration (6-3) is formed, the σ (λ in the formula
1) be NO
2In wavelength X
1The absorption cross section value at place, σ (λ
2) be NO
2In wavelength X
2The absorption cross section value at place, L is the distance that light is advanced in gas passage (3), N is NO in the gas passage (3)
2The mean concentration of gas, the value of described wavelength A are any one numerical value in 420～460 numerical value intervals.
2, nitrogen dioxide gas concentration monitoring system according to claim 1, the value that it is characterized in that described wavelength A is 440nm.
3, be applied to the monitoring method of nitrogen dioxide gas concentration monitoring system, it is characterized in that it is made up of following steps: one, spectrum extraction step: make nitrogen dioxide gas inflow gas passage (3), the light that light emitting diode (1) is sent is input to the light detection input end of spectrograph (5) successively by convex lens (2), gas passage (3) and No. two convex lens (4), spectrograph (5) extracts spectrum; Two, NO
2Gas concentration calculation procedure: receive the spectrum that spectrograph (5) extracts by the Data Receiving unit (6-1) in the computing machine (6); Then by value unit (6-2) adjacent peak I (λ that gets ripple nearby with wavelength Anm in spectrum in the computing machine (6)
1) and valley I (λ
2), the value of described wavelength A is any one numerical value in 420～460 numerical value intervals; Then pass through the interior computing unit (6-3) of computing machine (6) the peak I (λ of ripple
1) and valley I (λ
2) bring N=-Ln[I (λ into
1) ÷ I (λ
2)] ÷ { [σ (λ
1)-σ (λ
2)] * calculate NO in the L} formula
2Gas concentration, the σ (λ in the formula
1) be NO
2In wavelength X
1The absorption cross section value at place, σ (λ
2) be NO
2In wavelength X
2The absorption cross section value at place, L is the distance that light is advanced in gas passage (3), N is NO in the gas passage (3)
2The mean concentration of gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510010501 CN1766569A (en) | 2005-11-02 | 2005-11-02 | Nitrogen dioxide gas concentration monitoring system and monitoring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510010501 CN1766569A (en) | 2005-11-02 | 2005-11-02 | Nitrogen dioxide gas concentration monitoring system and monitoring method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN1766569A true CN1766569A (en) | 2006-05-03 |
Family
ID=36742582
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|---|---|---|---|
| CN 200510010501 Pending CN1766569A (en) | 2005-11-02 | 2005-11-02 | Nitrogen dioxide gas concentration monitoring system and monitoring method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957314A (en) * | 2010-09-10 | 2011-01-26 | 哈尔滨工业大学 | Integrating sphere based system for detecting concentration of nitrogen dioxide gas and detection method thereof |
| CN101975756A (en) * | 2010-10-15 | 2011-02-16 | 赵建平 | Method for quickly detecting hypermanganate index in water by molecular absorption spectrometry |
| CN101718693B (en) * | 2009-12-04 | 2011-06-22 | 天津理工大学 | Nitrogen dioxide gas concentration measuring instrument of optical fiber with mismatched fiber core |
-
2005
- 2005-11-02 CN CN 200510010501 patent/CN1766569A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718693B (en) * | 2009-12-04 | 2011-06-22 | 天津理工大学 | Nitrogen dioxide gas concentration measuring instrument of optical fiber with mismatched fiber core |
| CN101957314A (en) * | 2010-09-10 | 2011-01-26 | 哈尔滨工业大学 | Integrating sphere based system for detecting concentration of nitrogen dioxide gas and detection method thereof |
| CN101975756A (en) * | 2010-10-15 | 2011-02-16 | 赵建平 | Method for quickly detecting hypermanganate index in water by molecular absorption spectrometry |
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