CN102313702A - Photoelectric analysis method and device for gas in pipeline - Google Patents
Photoelectric analysis method and device for gas in pipeline Download PDFInfo
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Abstract
The invention relates to a photoelectric analysis method for gas in a pipeline. The method comprises the following steps that: gas to be detected in the pipeline is introduced into a measurement pipe; an airflow perturbator is arranged in the measurement pipe; a gas guiding hole which penetrates through the airflow perturbator is formed in the airflow perturbator; light which is emitted by a light source passes through the gas to be detected on the downstream of the airflow perturbator in the measurement pipe, is absorbed by the gas to be detected, then is received by a detector and is converted into an electrical signal; and an analysis unit processes the electrical signal output by the detector so as to acquire the concentration of the gas to be detected. The invention also discloses a device for realizing the method.
Description
Technical field
The present invention relates to the analysis of gas concentration in the pipeline, the photoelectric analysis method and apparatus of gas in particularly a kind of pipeline.
Background technology
In fields such as metallurgy, petrochemical industry, chemical industry, building materials, need the concentration of gas in the observation process pipeline, and be used for instructing production.
The gas absorption spectra analytical technology is as a kind of photoelectric analysis technology, has short, plurality of advantages such as measuring accuracy is high, energy consumption is low of response time, is widely used in the gas-monitoring.The gas absorption spectra analytical equipment comprises light source, detector and analytic unit, and concrete working method is: light source sends measuring light, measures the absorption spectrum spectral line of light wavelength corresponding to gas to be measured; Measuring light is passed gas to be measured and is absorbed, and the measuring light behind the gas to be measured is passed in the detector reception, and converts electric signal into, and analytic unit passes through the decay of analysis to measure light, thereby draws the concentration of gas to be measured.The measurement of gas absorption spectra concerns based on Beer-Lambert:
I＝I
0e
-αl
I wherein
0Be to pass to be absorbed absorption line wavelength luminous energy down before the gas, I passes to be absorbed absorption line wavelength luminous energy down behind the gas, and α is the absorption of gas unit, and l is the distance that light passes in absorption gas.Increase to measure light path and can reduce the gas concentration detection limit, but also absorb saturatedly for the gasmetry of high concentration easily, influence measuring accuracy.
At present, the monitoring of gas concentration is divided into following dual mode in the pipeline:
1, formula on the throne; See also shown in Figure 1; Be specially: light source 2a and detector 2b are installed in the sidepiece of measuring channel 1, and the light that light source 2a sends passes the gas to be measured (two distances of managing between 3 are the measurement light path) in the pipeline 1, is received by detector 2b afterwards; Analytic unit passes through the decay of analysis to measure light, thereby draws the concentration of gas to be measured.Can be referring to patent US20050128486, US5517314, US7324204, CN2004100935072, CN2004100533712, CN2005100607797.Therefore monitoring method is the concentration of gas in the analysis conduit in real time when on the throne, has therefore obtained using the most widely.
2, sampling formula; Be specially: the gas in the sampler sampling pipe; Through dewatering, delivering to photoelectronic analyzer behind the pretreatment unit such as dedusting, step-down, the light that light source sends passes the gas to be measured in pretreatment unit downstream, is received by detector afterwards; Analytic unit passes through the decay of analysis to measure light, thereby draws the concentration of gas to be measured.Compare with formula analysis mode on the throne, the sampling formula can be applied in the abominable operating mode of measurement environment, like high dust, high pressure etc., but has also brought deficiencies such as measurement delay, complex structure, maintenance be big.Therefore, the application of sampling formula does not have formula on the throne extensive.
For formula metering system on the throne, as shown in Figure 1, light source 2a and detector 2b are installed in the both sides of pipeline 1 usually, and the maximal value of measuring light path 4 is the internal diameter size of pipeline 1.But receive the restriction of construction section condition when installing through regular meeting, low such as measure gas concentrations, but it is too little to measure caliber, has limited optical path length, makes surveying instrument can't satisfy the detection limit requirement; When measure gas concentrations is high, measure caliber simultaneously too big the time, make that gas is total to be absorbed too big and get into the inelastic region, influence measuring accuracy; Outside the measurement point pipeline, barrier is arranged, the installation site of light source and detector can not be vertical with airflow direction.
In order to solve above-mentioned deficiency; Usually can the pipeline of surveying instrument construction section be replaced by the greater or lesser pipeline of radius; Measure light path thereby change; But, make the gas concentration that measures to reflect real gas concentration in the original pipeline because the variation of caliber can cause the interior air velocity distribution of pipe of surveying instrument construction section to change.Perhaps, make path and airflow direction out of plumb between light source and the detector, make the gas concentration that measures and non-perpendicular to the gas concentration of airflow direction for fear of the barrier of construction section.
Summary of the invention
In order to solve above-mentioned deficiency of the prior art, the invention provides the photoelectric analysis method and apparatus of gas in a kind of pipeline, can change the measurement light path effectively, thereby measurement is normally carried out.
For realizing the foregoing invention purpose, the present invention adopts following technical scheme:
The photoelectric analysis method of gas in a kind of pipeline, characteristics are:
Gas to be measured in the said pipeline feeds in the measuring tube; Be provided with the flow perturbation device in the measuring tube, said flow perturbation device is provided with the gas port that runs through the flow perturbation device;
The light that light source sends passes the gas to be measured in the flow perturbation device downstream in the measuring tube, and by gas absorption to be measured, is received by detector afterwards, converts electric signal into;
Analytic unit is handled the electric signal of detector output, thereby obtains the concentration of gas to be measured.
As preferably, measuring tube perpendicular to the radius of the minimum circle-cover in the cross section of airflow direction radius perpendicular to the minimum circle-cover in the cross section of airflow direction greater than said pipeline.Minimum circle-cover be meant can the overlay planes figure the minimum circle of radius.
Further, be carved into simultaneously and reach in the measuring tube upstream line, arrive between light source and the detector mistiming on the light path less than 5S perpendicular to the gas on the cross section of airflow direction.
As preferably, dredge in the middle of the distribution of the gas port on the said flow perturbation device, close all around.
Further, between the central axis of the central axis of said gas port and measuring tube angle greater than zero.
As preferably, said flow perturbation device adopts porous medium.
As preferably, the optical axis of light path is perpendicular to the central axis of flow perturbation device between light source and the detector.
The invention allows for the photoelectronic analyzer of gas in a kind of like this pipeline, specifically comprise:
Measuring tube, the inlet of measuring tube is communicated with said pipeline is interior;
Be arranged on the flow perturbation device in the measuring tube, the flow perturbation device is provided with the gas port that runs through the flow perturbation device;
Light source is arranged on the sidepiece of measuring tube;
Detector is arranged on the sidepiece of measuring tube, makes behind the gas to be measured in the flow perturbation device downstream of light in passing measuring tube that light source sends, and can be received by detector;
Analytic unit is used to handle the output signal of detector, thereby obtains the concentration of gas to be measured in the pipeline.
As preferably, measuring tube perpendicular to the radius of the minimum circle-cover in the cross section of airflow direction radius perpendicular to the minimum circle-cover in the cross section of airflow direction greater than said pipeline.
As preferably, dredge in the middle of the distribution of the gas port on the said flow perturbation device, close all around.
Further, between the central axis of the central axis of said gas port and measuring tube angle greater than zero.
As preferably, said flow perturbation device adopts porous medium.
As preferably, the optical axis of light path is perpendicular to the central axis of flow perturbation device between light source and the detector.
Compared with prior art, the present invention has following beneficial effect:
1, through other the bigger measuring tube of water conservancy radius is set, thereby has increased the measurement light path effectively, make measurement normally to carry out, also reduced measuring error.
2, through the flow perturbation device is set, make to be carved into simultaneously to reach in the measuring tube upstream line perpendicular to the gas on the cross section of airflow direction, arrive between light source and the detector mistiming on the light path less than 5S; , also be almost to arrive the measurement light path simultaneously with gas to be measured constantly in the pipeline, thereby can make the concentration of gas in a certain moment pipeline of the true reflection of measurement result.
Description of drawings
Fig. 1 is the structural representation of a kind of photoelectronic analyzer in the prior art;
Fig. 2 is the structural representation of photoelectronic analyzer among the embodiment 1;
Fig. 3 is the structural representation of photoelectronic analyzer among the embodiment 2;
Fig. 4 is the structural representation of photoelectronic analyzer among the embodiment 3;
Fig. 5 is the synoptic diagram of the minimum circle-cover in the cross section of measuring tube and pipeline among the embodiment 3;
Fig. 6 is the structural representation of photoelectronic analyzer among the embodiment 4;
Fig. 7 is the synoptic diagram of the minimum circle-cover in the cross section of measuring tube and pipeline among the embodiment 4;
Fig. 8 is the structural representation of another photoelectronic analyzer of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is explained further details.
Embodiment 1:
As shown in Figure 2, the photoelectronic analyzer of gas is applied in the field of metallurgy in a kind of pipeline, is used to monitor the CO concentration in the pipeline.Said photoelectronic analyzer comprises measuring tube 11, flow perturbation device 41, light source 21, detector 22 and analytic unit.
The inlet of said measuring tube 11, outlet are communicated with pipe interior, make that the gas to be measured in the pipeline can flow in the measuring tube 11 voluntarily.Measuring tube 11 perpendicular to the radius of the minimum circle-cover in the cross section of airflow direction radius perpendicular to the minimum circle-cover in the cross section of airflow direction greater than said pipeline.Measuring tube 11 all is a pipe with pipeline in the present embodiment.
As shown in Figure 2; The central axis of said flow perturbation device 41 is parallel with the central axis of measuring tube 11; And be plate-like, and being provided with the gas port 42 that runs through flow perturbation device 41 above, the central axis of gas port 42 is parallel with the central axis of measuring tube 11; The distribution of gas port 42 is dredged in the middle of being on the flow perturbation device 41, and is close all around.
Setting through said flow perturbator 41, light source 21 and detector 22; Be carved into simultaneously and reach in measuring tube 11 upstream line perpendicular to the gas on the cross section of airflow direction; Arrive between light source 21 and the detector 22 mistiming on the light path less than 5S, thereby can make the concentration of gas in a certain moment pipeline of the true reflection of measurement result.
Present embodiment has also disclosed the photoelectric analysis method of gas in a kind of pipeline, is applied in the field of metallurgy, is used to monitor the CO concentration in the pipeline, and characteristics are:
Gas to be measured in the pipeline feeds in the measuring tube 11, and the internal diameter of measuring tube 11 is greater than the internal diameter of said pipeline; Be provided with flow perturbation device 41 in the measuring tube; As shown in Figure 2, the central axis of said flow perturbation device 41 is parallel with the central axis of measuring tube 11, and is plate-like, is provided with the gas port 42 that runs through flow perturbation device 41 above, and the distribution of gas port 42 is dredged in the middle of being on the flow perturbation device 41, and is close all around.
The measurement light wavelength of light source 21 outputs is corresponding to the absorption spectrum spectral line of CO, and measuring light is passed the gas to be measured in flow perturbation device 41 downstream in the measuring tube, and by gas absorption to be measured, is received by detector 22 afterwards, converts electric signal into; Be carved into simultaneously and reach in measuring tube 11 upstream line perpendicular to the gas on the cross section of airflow direction; Mistiming between arrival light source 21 and the detector 22 on the light path is less than 1S; Thereby can make the concentration of CO in a certain moment pipeline of the true reflection of follow-up measurement result, instruct better and produce;
Analytic unit is handled the electric signal of detector 22 outputs, thereby draws the decay of measuring light at said absorption spectrum spectral line place, and then obtains the concentration of CO in the pipeline.
Embodiment 2:
As shown in Figure 3, the photoelectronic analyzer of gas in a kind of pipeline is used for the O in the measuring channel
2Concentration, different with embodiment 1 is:
1, as shown in Figure 3, the angle between the central axis of the gas port 32 on the flow perturbation device 31 and the central axis of measuring tube 11 is an acute angle, and this angle from the center to around become big gradually.
2, the output wavelength of light source 21 is corresponding to O
2The absorption spectrum spectral line.
Compare with the flow perturbation device among the embodiment 1; Be carved into simultaneously and reach in measuring tube 11 upstream line perpendicular to the gas on the cross section of airflow direction; Mistiming between arrival light source 21 and the detector 22 on the light path is littler, therefore can reflect the O in a certain moment pipeline more exactly
2Concentration is used for better instructing and produces.
Present embodiment has also disclosed the photoelectric analysis method of gas in a kind of pipeline, is applied in the field of metallurgy, is used to monitor the O in the pipeline
2Concentration, different with embodiment 1 is:
1, as shown in Figure 3, the angle between the central axis of the gas port 42 on the flow perturbation device 41 and the central axis of measuring tube 11 is an acute angle, and this angle from the center to around become big gradually.
2, the output wavelength of light source is corresponding to O
2The absorption spectrum spectral line.
Compare with the flow perturbation device among the embodiment 1; Be carved into simultaneously and reach in measuring tube 11 upstream line perpendicular to the gas on the cross section of airflow direction; Mistiming between arrival light source 21 and the detector 22 on the light path is littler, therefore can reflect the O in a certain moment pipeline more exactly
2Concentration instructs better and produces.
Embodiment 3:
As shown in Figure 4, the photoelectronic analyzer of gas is applied in the chemical field in a kind of pipeline, is used for the CO in the measuring channel
2Concentration, different with embodiment 1 is:
1, as shown in Figure 4, flow perturbation device 51 adopts porous medium.
2, the output wavelength of light source 21 is corresponding to CO
2The absorption spectrum spectral line.
3, as shown in Figure 5, the cross section perpendicular to airflow direction of measuring tube is a rectangle 61, and the cross section perpendicular to airflow direction of said pipeline is circular, but the radius R 1 of the minimum circle-cover of said rectangle 61 is greater than the radius R 2 of said circle.
Present embodiment has also disclosed the photoelectric analysis method of gas in a kind of pipeline, is applied in the chemical field, is used to monitor the CO in the pipeline
2Concentration, different with embodiment 1 is:
1, as shown in Figure 4, flow perturbation device 51 adopts porous medium.
2, the output wavelength of light source 21 is corresponding to CO
2The absorption spectrum spectral line.
3, as shown in Figure 5, the cross section perpendicular to airflow direction of measuring tube is a rectangle 61, and the cross section perpendicular to airflow direction of said pipeline is circular, but the radius R 1 of the minimum circle-cover of said rectangle 61 is greater than the radius R 2 of said circle.
Embodiment 4:
As shown in Figure 6, the photoelectronic analyzer of gas in a kind of pipeline is used for the O in the measuring channel
2Concentration, different with embodiment 2 is:
1, as shown in Figure 6, the angle between the central axis of the central axis of flow perturbation device 31 and measuring tube 11 is an acute angle.
Angle between the optical axis of the light path that 2, forms between light source 21 and the detector 22 and the central axis of flow perturbation device 31 is the right angle.
3, as shown in Figure 7, the cross section perpendicular to airflow direction of measuring tube is irregular shape 71, and the cross section perpendicular to airflow direction of said pipeline is circular, but the radius R 1 of the minimum circle-cover of said irregular shape 71 is greater than the radius R 2 of said circle.
Compare with the analytical equipment among the embodiment 1, it is longer to measure light path, the O of energy measurement lower concentration
2
Present embodiment has also disclosed the photoelectric analysis method of gas in a kind of pipeline, is applied in the field of metallurgy, is used to monitor the O in the pipeline
2Concentration, different with embodiment 1 is:
1, as shown in Figure 6, the angle between the central axis of the central axis of flow perturbation device 31 and measuring tube 11 is an acute angle.
Angle between the optical axis of the light path that 2, forms between light source 21 and the detector 22 and the central axis of flow perturbation device 31 is the right angle.
3, as shown in Figure 7, the cross section perpendicular to airflow direction of measuring tube is irregular shape 71, and the cross section perpendicular to airflow direction of said pipeline is circular, but the radius R 1 of the minimum circle-cover of said irregular shape 71 is greater than the radius R 2 of said circle.
Compare with the analytical approach among the embodiment 2, it is longer to measure light path, the O of energy measurement lower concentration
2
Above-mentioned embodiment should not be construed as the restriction to protection domain of the present invention.Having enumerated several kinds of flow perturbation devices among the embodiment, can also be other form certainly, as shown in Figure 8, and the flow perturbation device is made up of several staggered porous plates.Key of the present invention is: be provided with inner be communicated with pipeline and internal diameter greater than the measuring tube of pipeline, and the flow perturbation device is set in measuring tube, the light path that forms between light source and the detector is passed the gas to be measured in flow perturbation device downstream.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 (13)
1. the photoelectric analysis method of gas in the pipeline is characterized in that:
Gas to be measured in the said pipeline feeds in the measuring tube; Be provided with the flow perturbation device in the measuring tube, said flow perturbation device is provided with the gas port that runs through the flow perturbation device;
The light that light source sends passes the gas to be measured in the flow perturbation device downstream in the measuring tube, and by gas absorption to be measured, is received by detector afterwards, converts electric signal into;
Analytic unit is handled the electric signal of detector output, thereby obtains the concentration of gas to be measured.
2. method according to claim 1 is characterized in that: be carved into simultaneously and reach in the measuring tube upstream line perpendicular to the gas on the cross section of airflow direction, arrive between light source and the detector mistiming on the light path less than 5S.
3. method according to claim 1 and 2 is characterized in that: measuring tube perpendicular to the radius of the minimum circle-cover in the cross section of airflow direction radius perpendicular to the minimum circle-cover in the cross section of airflow direction greater than said pipeline.
4. method according to claim 1 and 2 is characterized in that: dredges in the middle of the distribution of the gas port on the said flow perturbation device, and close all around.
5. method according to claim 1 and 2 is characterized in that: angle is greater than zero between the central axis of said gas port and the central axis of measuring tube.
6. method according to claim 1 and 2 is characterized in that: said flow perturbation device adopts porous medium.
7. method according to claim 1 and 2 is characterized in that: the optical axis of light path is perpendicular to the central axis of flow perturbation device between light source and the detector.
8. the photoelectronic analyzer of gas in the pipeline, it is characterized in that: said analytical equipment comprises:
Measuring tube, the inlet of measuring tube is communicated with said pipeline is interior;
Be arranged on the flow perturbation device in the measuring tube, the flow perturbation device is provided with the gas port that runs through the flow perturbation device;
Light source is arranged on the sidepiece of measuring tube;
Detector is arranged on the sidepiece of measuring tube, makes behind the gas to be measured in the flow perturbation device downstream of light in passing measuring tube that light source sends, and can be received by detector;
Analytic unit is used to handle the output signal of detector, thereby obtains the concentration of gas to be measured in the pipeline.
9. photoelectronic analyzer according to claim 8 is characterized in that: measuring tube perpendicular to the radius of the minimum circle-cover in the cross section of airflow direction radius perpendicular to the minimum circle-cover in the cross section of airflow direction greater than said pipeline.
10. according to Claim 8 or 9 described photoelectronic analyzers, it is characterized in that: dredge in the middle of the distribution of the gas port on the said flow perturbation device, close all around.
11. according to Claim 8 or 9 described photoelectronic analyzers, it is characterized in that: angle is greater than zero between the central axis of said gas port and the central axis of measuring tube.
12. according to Claim 8 or 9 described photoelectronic analyzers, it is characterized in that: said flow perturbation device adopts porous medium.
13. according to Claim 8 or 9 described photoelectronic analyzers, it is characterized in that: the optical axis of light path is perpendicular to the central axis of flow perturbation device between light source and the detector.
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| CN 201010223234 CN102313702B (en) | 2010-07-03 | 2010-07-03 | Photoelectric analysis method and device for gas in pipeline |
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Effective date of registration: 20231207 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. |