CN102175642B - On-site gas measurement method and device - Google Patents
On-site gas measurement method and device Download PDFInfo
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- CN102175642B CN102175642B CN2010106223842A CN201010622384A CN102175642B CN 102175642 B CN102175642 B CN 102175642B CN 2010106223842 A CN2010106223842 A CN 2010106223842A CN 201010622384 A CN201010622384 A CN 201010622384A CN 102175642 B CN102175642 B CN 102175642B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/85—Investigating moving fluids or granular solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
- G01N2021/396—Type of laser source
- G01N2021/399—Diode laser
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Abstract
The invention relates to an on-site gas measurement method, which is characterized by comprising the following steps of: forming a measuring light path between a light source and a detector through measured light transmitted by the light source, wherein the measuring light path is provided with a measurement area and a non-measurement area; introducing a first gas into the non-measurement area, wherein the first gas contains the measured gas; introducing the first gas into the non-measurement area after airflow delay; measuring the concentration of the measured gas in the first gas before or during the airflow delay; and analyzing attenuation of the measured light in the measurement area and the non-measurement area, and obtaining the concentration of the measured gas in the measurement area by utilizing the concentration of the measured gas in the first gas. The method has the advantages of high measuring accuracy and the like.
Description
Technical field
The present invention relates to gasmetry, particularly utilize the method and the device of gas absorption spectra technology on-position measure gas.
Background technology
In fields such as waste incineration,, need monitor the O in the combustion furnace accurately and timely in order to control the burning efficiency in the combustion furnace
2Content.O in the combustion furnace
2The measurement of concetration scope is 0～25%, and temperature range is 800～900 ℃.
At present, the laser absorption spectrum gas analysis device based on DLAS (Diode Laser Absorption Spectroscopy) technology is widely used in the gasmetry.The ultimate principle of DLAS technology is: tuning measurement light wavelength makes it correspond to the absorption line of gas to be measured; Measuring light is passed gas to be measured and is converted into electric signal by the detector reception, obtains the absorption of measuring light at said absorption line place, obtains the parameters such as concentration of gas to be measured according to Beer-Lambert law.The DLAS technology has plurality of advantages, as: the original position on-line measurement, the response time is very short, can reach Millisecond, can realize continuous coverage; Measurement lower limit is low, can be used for measuring the gas that concentration is the ppb level; Measuring accuracy is high.
As shown in Figure 1, a kind of formula oxygen measurement device on the throne, Optical Transmit Unit 14 and light receiving unit 15 are arranged on the both sides of combustion furnace 10, isolate gas 11 to be measured through diaphragm 16,17 simultaneously; Wherein, light source 2 is arranged in the Optical Transmit Unit 14, and detector 20 is arranged in the light receiving unit 15.The measuring beam 19 that light source 2 sends through the transmitance of analytic unit 30 analysis to measure light beams 19, thereby is obtained parameter such as oxygen concentration in the gas 11 to be measured by the oxygen absorption in the gas 11 to be measured.
Outside air contains oxygen, and oxygen can get in said Optical Transmit Unit 14 and the light receiving unit 15, has absorbed part measuring beam 19, thereby has influenced measuring accuracy.
In addition, the particle in gas 11 to be measured more for a long time, particle can stick on the said diaphragm 16,17, greatly reduces the transmitance of measuring beam 19, even can to make transmittance be zero, has had a strong impact on measuring accuracy, even measurement can't be carried out.
In order to get rid of above-mentioned adverse effect, this measurement mechanism has also disposed purging unit 21, in said Optical Transmit Unit 14 and light receiving unit 15, charges into purge gas 22.Perhaps the side to said diaphragm 16,17 contiguous gases 11 to be measured charges into purge gas 22, thereby makes the particle in the gas 11 to be measured can't pollute said diaphragm 16,17, and above-mentioned measure has improved measuring accuracy greatly, has also improved the sustainability of measuring.
Usually use high pure nitrogen as purge gas 22, but in fields such as waste incineration, high pure nitrogen is difficult to obtain, and has, also contains oxygen in the nitrogen again, measures the oxygen meeting absorptiometry light in the purge gas on the light path, thereby reduced measuring accuracy.
In order to solve the problems of the technologies described above; Usually way is: oxygen sensor 26 is set in Optical Transmit Unit; Record concentration of oxygen in the purge gas; Through the deduction purge gas (comprise in the Optical Transmit Unit or light receiving unit in or diaphragm close on the purge gas of gas one side to be measured) in oxygen to the absorption of measuring light, and then obtain in the combustion furnace parameter such as oxygen concentration.The weak point of this method is mainly:
1, oxygen sensor is longer to the response time of oxygen than measurement mechanism to the response time of oxygen, thereby measurement mechanism can not be deducted the oxygen concentration in the sweep gas in real time, can not be in real time the oxygen concentration in the response measurement zone accurately.
2, the oxygen concentration in sweep gas takes place in the fluctuation, and oxygen sensor has deviation to the measured value of oxygen concentration, makes measurement mechanism increase the measured oxygen concentration value error in the measured zone.
Summary of the invention
In order to solve above-mentioned deficiency of the prior art, the invention provides the on-position measure method of the gas that a kind of measuring accuracy is high, cost is low, a kind of on-position measure device of simple in structure, measuring accuracy is high, cost is low gas also is provided.
In order to realize the foregoing invention purpose, the present invention adopts following technical scheme respectively:
The on-position measure method of gas, characteristics are:
The measuring light that light source sends forms between light source and detector measures light path, measures on the light path to have measured zone and non-measured zone; Be connected with first gas in the said non-measured zone, contain tested gas in first gas;
First gas gets into non-measured zone through air-flow time-delay back; Before the air-flow time-delay or in the time-delay, record the concentration of tested gas in first gas;
Analysis to measure light is in the decay of measured zone and non-measured zone, and utilizes the concentration of tested gas in first gas, thereby obtains the concentration of tested gas in the measured zone.
Further, the time that records tested gas concentration in first gas is less than or equal to the time that first gas arrives non-measured zone.
As preferably, adopt pipeline or whirlwind jar first gas of delaying time.
As preferably, adopt electrochemical techniques or spectral analysis technique or paramagnetic analytical technology to measure the concentration of tested gas in first gas.
Further, said tested gas is oxygen.
In order to realize said method, the invention allows for the on-position measure device of such gas, comprising:
Light source, the measuring light of output is by tested gas absorption;
Detector receives and passes the measuring light of measured zone and non-measured zone, and converts electric signal into;
First gas provides the unit, feeds non-measured zone behind first gas process air-flow time delay part that provides, and contains tested gas in first gas;
Sensing unit, the concentration of tested gas in first gas in the parts or the upper reaches during measurement of gas curtain coating;
Analytic unit, the decay of analysis to measure light, and utilize the concentration of tested gas in first gas, thus obtain the tested gas concentration in the measured zone.
As preferably, said air-flow time delay device adopts pipeline or whirlwind jar.
As preferably, the time that said sensing unit records concentration is less than or equal to the time that first gas feeds non-measured zone.
Compared with prior art, the present invention has following beneficial effect:
1, real-Time Compensation
Through the air-flow time-lag action, make the measured value of the tested gas sensing unit in the measurement mechanism and first gas synchronous, let the measurement mechanism tested gas concentration in deduction first gas in real time, thus realize tested gasmetry value in the measured zone in real time accurately.
2, reduce influence of fluctuations
In the tested gas concentration fluctuation in first gas,, let the fluctuation of concentration of the tested gas in first gas reduce, thereby make the signal of sensing unit steadily export through the effect of air-flow chronotron.。
Description of drawings
Fig. 1 is the structural representation of oxygen measurement device in the prior art;
Fig. 2 is the structural representation of oxygen measurement device in the embodiment of the invention 1;
Fig. 3 is the structural representation of oxygen measurement device in the embodiment of the invention 2;
Fig. 4 is the structural representation of oxygen measurement device in the embodiment of the invention 3.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is explained further details.
Embodiment 1:
As shown in Figure 2, the on-position measure device of oxygen in a kind of incinerator comprises:
Light receiving unit 15 comprises detector 20, and the selection of detector 20 is state of the art, repeats no more at this.
Optical Transmit Unit 14, light receiving unit 15 connect on combustion furnace 10 through devices such as flange, valves, and the measuring light 19 that makes laser instrument 25 send is received by detector 20 after passing the measured zone in the combustion furnace 10.Separate test environment and Optical Transmit Unit 14 through diaphragm 16, separate test environment and light receiving unit 15 through diaphragm 17.
First gas provides unit 21; Provide nitrogen 23 (oxygen that contains trace) earlier through air-flow time delay device 27; Feed non-measured zone afterwards, also promptly purge the inside of Optical Transmit Unit 14, light receiving unit 15 and the side that diaphragm 16,17 closes on measured zone.Said air-flow time delay device 27 adopts the longer pipe roads, and gas mobile in pipeline prolonged the time that first gas arrives non-measured zone.
Present embodiment has also disclosed a kind of on-position measure method of oxygen, is used to measure concentration of oxygen in the incinerator, and said measuring method is specially:
Under the measurement state, under the effect of Laser Drive module, the absorption line that the measuring light frequency of laser instrument 25 output can inswept oxygen; Measuring light is received by detector 30 after passing measured zone, non-measured zone, and converts electric signal into;
First gas provides unit 21, provides nitrogen 23 (oxygen that contains trace) earlier through the air-flow time delay device, feeds non-measured zone afterwards, also promptly purges the inside of Optical Transmit Unit 14, light receiving unit 15 and the side that diaphragm 16,17 closes on measured zone.Said air-flow time delay device 27 adopts the longer pipe roads, and gas mobile in pipeline prolonged the time that first gas arrives non-measured zone.
Be arranged on the oxygen sensor on the pipeline at air-flow time delay device 27 upper reaches, utilize electrochemical techniques to record concentration of oxygen in first gas; The time of measuring tested gas concentration in first gas is less than or equal to the time that first gas passes through air-flow time delay device 27 and arrives non-measured zone, thereby makes this concentration value can in time be used for the measurement of oxygen concentration in the measured zone;
Embodiment 2:
As shown in Figure 3, the on-position measure device of oxygen in a kind of incinerator, different with embodiment 1 is:
1, use whirlwind jar 29 as the air-flow time delay device;
2, oxygen sensor is arranged on the whirlwind jar 29.
Present embodiment has also disclosed a kind of on-position measure method of oxygen, and different with embodiment 1 is:
First gas that provides gets into whirlwind jar 29, flows to the bottom downwards along spiral inner wall formula ground, and oxygen sensor records concentration of oxygen in first gas; First gas upwards flows by the bottom from the centre of whirlwind jar 29 and discharges whirlwind jar 29, thereby prolonged the time that first gas arrives non-measured zone, to remedy the measurement retardation time of oxygen sensor.
Embodiment 3:
As shown in Figure 4, the on-position measure device of oxygen in a kind of incinerator, different with embodiment 2 is:
Because the particles such as dirt that measured zone contains are less, therefore diaphragm is moved to measured zone, do not re-use first gas and go to purge the side that diaphragm closes on measured zone.
Present embodiment has also disclosed a kind of on-position measure method of oxygen, and different with embodiment 1 is:
Because the particles such as dirt that measured zone contains are less, therefore diaphragm is moved to measured zone, do not re-use first gas and go to purge the side that diaphragm closes on measured zone.
Above-mentioned embodiment should not be construed as the restriction to protection domain of the present invention.Having enumerated the measurement of oxygen among the embodiment, can also be other gas certainly, like carbon dioxide etc.The technology of measuring tested gas in first gas can also be spectral analysis technique, paramagnetic analytical technology etc.Key of the present invention is: first gas feeds non-measured zone through the time-delay back earlier; Be used for purging or positive-pressure explosion-proof; Measure the concentration of tested gas in first gas before the time-delay of first gas or in the time-delay; The time that records this concentration arrives the time of non-measured zone less than first gas, thereby makes the concentration value of tested gas in the gas of winning can in time be used for the measurement of tested gas in the measured zone.Under the situation that does not break away from spirit of the present invention, any type of change that the present invention is made all should fall within protection scope of the present invention.
Claims (7)
1. the on-position measure method of gas is characterized in that:
The measuring light that the LASER Light Source of tunable wave length sends forms between light source and detector measures light path, measures on the light path to have measured zone and non-measured zone; Be connected with first gas in the said non-measured zone, contain tested gas in first gas;
First gas gets into non-measured zone through air-flow time-delay back; Before the air-flow time-delay or in the time-delay, utilize electrochemical techniques or paramagnetic technologies to record the concentration of tested gas in first gas;
Analysis to measure light is in the decay of measured zone and non-measured zone, and utilizes the concentration of tested gas in first gas, thereby obtains the concentration of tested gas in the measured zone.
2. measuring method according to claim 1 is characterized in that: the time that records tested gas concentration in first gas is less than or equal to the time that first gas arrives non-measured zone.
3. measuring method according to claim 1 is characterized in that: adopt pipeline or whirlwind jar first gas of delaying time.
4. measuring method according to claim 1 is characterized in that: said tested gas is oxygen.
5. the on-position measure device of gas comprises:
The LASER Light Source of tunable wave length, the measuring light of output is by tested gas absorption;
Detector receives and passes the measuring light of measured zone and non-measured zone, and converts electric signal into;
First gas provides the unit, feeds non-measured zone behind first gas process air-flow time delay part that provides, and contains tested gas in first gas;
The concentration of tested gas in the parts or in first gas at upper reaches when sensing unit, said sensing unit utilize electrochemical techniques or paramagnetic technologies measurement of gas curtain coating;
Analytic unit, the decay of analysis to measure light, and utilize the concentration of tested gas in first gas, thus obtain the tested gas concentration in the measured zone.
6. measurement mechanism according to claim 5 is characterized in that: said air-flow time delay device adopts pipeline or whirlwind jar.
7. measurement mechanism according to claim 5 is characterized in that: the time that said sensing unit records concentration is less than or equal to the time that first gas feeds non-measured zone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106223842A CN102175642B (en) | 2010-12-31 | 2010-12-31 | On-site gas measurement method and device |
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| CN2010106223842A CN102175642B (en) | 2010-12-31 | 2010-12-31 | On-site gas measurement method and device |
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| CN102175642A CN102175642A (en) | 2011-09-07 |
| CN102175642B true CN102175642B (en) | 2012-12-12 |
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| CN103712468A (en) * | 2013-12-17 | 2014-04-09 | 聚光科技(杭州)股份有限公司 | Combustion control system and method for lowering oxygenation burning losses of industrial furnace |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321882A (en) * | 2001-06-20 | 2001-11-14 | 包克明 | Multicomponent gas infrared monitoring system |
| CN1866027A (en) * | 2006-05-18 | 2006-11-22 | 南京卓成自动化设备有限公司 | Integrated gas online detector |
| CN101175988A (en) * | 2005-05-16 | 2008-05-07 | 陶氏环球技术公司 | Excess air control for cracker furnace burners |
| CN101663573A (en) * | 2007-02-26 | 2010-03-03 | 横河电机美洲有限公司 | Combustion gas analysis |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101408458A (en) * | 2003-03-31 | 2009-04-15 | 佐勒技术公司 | Method and device for monitoring and controlling combusting course |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321882A (en) * | 2001-06-20 | 2001-11-14 | 包克明 | Multicomponent gas infrared monitoring system |
| CN101175988A (en) * | 2005-05-16 | 2008-05-07 | 陶氏环球技术公司 | Excess air control for cracker furnace burners |
| CN1866027A (en) * | 2006-05-18 | 2006-11-22 | 南京卓成自动化设备有限公司 | Integrated gas online detector |
| CN101663573A (en) * | 2007-02-26 | 2010-03-03 | 横河电机美洲有限公司 | Combustion gas analysis |
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Effective date of registration: 20231208 Address after: Room 505, 5th Floor, Building B, Building 1, No. 760 Bin'an Road, Changhe Street, Binjiang District, Hangzhou City, Zhejiang Province, 310052 Patentee after: Zhejiang Lingxi Photoelectric Technology Co.,Ltd. Patentee after: Zhejiang Lingxi Jingyi Technology Development Co.,Ltd. Address before: Hangzhou City, Zhejiang province Binjiang District 310052 shore road 760 Patentee before: Focused Photonics (Hangzhou), Inc. |