CN201152851Y - Flue gas pollution substance real-time on-line detection apparatus - Google Patents
Flue gas pollution substance real-time on-line detection apparatus Download PDFInfo
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- CN201152851Y CN201152851Y CNU2008200656985U CN200820065698U CN201152851Y CN 201152851 Y CN201152851 Y CN 201152851Y CN U2008200656985 U CNU2008200656985 U CN U2008200656985U CN 200820065698 U CN200820065698 U CN 200820065698U CN 201152851 Y CN201152851 Y CN 201152851Y
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Abstract
The utility model discloses a real-time on-line detection device for fume pollutants, which relates to the atmosphere environmental monitoring. The detection device consists of a pulse generator (1), a pulsed laser (2), a time delayer (3), an epidiascope (4), a long focal length lens (5), a photoelectric receiver (6), a fiber (7), a spectrometer (8), a photoelectric detector (9), an A/D converter (10) and a computer (11). With the focused high-energy laser beam, matters in fume are energized in high-energy state; during the process of the high-energy state returning to a ground state, various matters radiate respective features of spectrums; by analyzing the spectrums, the ingredients and concentration of magnesium, iron, copper, aluminum, lead, chromium, mercury, arsenic, and other pollutants in detected fume can be obtained. The detection device has the advantages of simple structure, reliable method, convenient operation, thereby being suitable for real-time on-line continuous detection of pipeline fume during the process of burning coal.
Description
Technical field
The utility model relates to atmosphere environment supervision, is mainly used in the real-time online of multiple pollutant detection in the tunnel gas in the coal combustion process.
Background technology
Along with the raising of the needs and the environmental protection consciousness of sustainable development, the harm of human beginning common concern atmospheric pollution.Up-to-date scientific research shows: the flue gas that coal combustion produces is the primary pollution source of atmospheric pollution, has become the main object of environmental improvement.How effectively to control the discharging of combustion process and Air thing, become the focus that government department and scientific research institution pay close attention to further gradually.The prerequisite of pollutant emission is to know the composition and the content of pollutant in the control flue gas, and the measurement of real-time online, and its testing result can in time be found the problem that occurs in the combustion process, so that in time take measures, to reduce the generation of major pollution incident.
The method of pollutant is off-line mostly in the detection flue gas at present commonly used, and representational have inductively coupled plasma emission spectrography (ICP-AES) and a flame photometric analysis method.These two kinds of methods have improved the accuracy of detection to polluter significantly, but all must in the laboratory, finish, and all needing before detection sample to be carried out early stage handles, therefore strict to testing environment, test period is long, need expend the great amount of manpower and material resources resource, thereby can't in the process of burning, carry out in real time, effectively control.Rarely seen single-element analysis of the device of present online detection of contamination composition and vehicle exhaust detection etc.For example: a kind of online atmospheric mercury analyzer (application number: 200510123603.1) can only analyze to single-element mercury.And for example: vehicle exhaust is detected the infrared laser detection system of usefulness and method (application number: 01141682.3) can whether exceed standard to vehicle exhaust and monitor in real time, but can't judge the composition of its pollutant in real time.These devices all are not suitable for the real time on-line monitoring of various pollutants of fume in the coal combustion process.
In view of above reality, consider the complicacy of exhaust gas components, and its on-line monitoring is in the hot environment, at present, find as yet can to multiple pollutant in the flue gas carry out the scene, in real time, the device of continuous detecting.
Summary of the invention
The purpose of this utility model is: the real time on-line detection device that flue gas pollutant is provided.This device adopts the Laser-induced Breakdown Spectroscopy technology, utilize the high energy laser beam that focuses on that the material in the tested flue gas is energized into high-energy state, they will give off characteristic spectrum separately in getting back to the process of ground state, analyze the wavelength and the intensity of these spectrum, can obtain the composition and the concentration thereof of pollutant in the tested flue gas.This apparatus structure is simple, and is easy to operate, can carry out real-time, online, continuous detection to the multiple pollutant in the flue gas.
The utility model adopts following technical scheme in order to achieve the above object:
The real time on-line detection device of flue gas pollutant is made up of pulse producer, pulsed laser, time delays device, saturating anti-mirror, long-focus condenser lens, light receiving device, optical fiber, spectrometer, photoelectric detector, A/D converter and computing machine.Pulse producer connects the external trigger end of pulsed laser and the input end of time delays device respectively; Laser emission direction saturating anti-mirror of the coaxial arrangement of order and long condenser lens at pulsed laser, the receiving end of light receiving device is placed in the coaxial position of anti-specular reflection direction, the output terminal of light receiving device is connected with the input end of spectrometer by optical fiber, and the output terminal of spectrometer is connected to the input end of photoelectric detector; The output terminal of time delays device is connected to another input end of photoelectric detector, and the output terminal of photoelectric detector is connected to the input end of A/D converter, and the output terminal of A/D converter is connected to computing machine.
Principle of work of the present utility model is: adopt this elemental analysis method of Laser-induced Breakdown Spectroscopy (LIBS) technology, this method comes from " the Laser-induced Breakdown Spectroscopy handbook (Handbook ofLaser-Induced Breakdown Spectroscopy) that U.S. David A.Cremers and LeonJ.Radziemski write.It is to utilize the high energy laser beam that focuses on that tested flue gas is punctured to form high-temperature plasma, various materials in the flue gas all are excited to high-energy state, get back to various materials in the process of ground state at high-energy state and will give off separately characteristic spectrum, by wavelength and the intensity of analyzing these spectrum, can obtain the composition and the concentration thereof of pollutant in the tested flue gas.Definite the atomic spectrum standard and the technical data library of element spectral line with reference to American National Standard and Institute for Research and Technology (NIST).According to a large amount of simulation tunnel gas experiments of measuring, the characteristic spectral line of getting the pollutant element is as follows: magnesium-279.6 nanometer, iron-404.6 nanometer, copper-324.8 nanometer, aluminium-309.3 nanometer, lead-405.8 nanometer, chromium-520.8 nanometer, mercury-253.7 nanometer, arsenic-228.8 nanometer.
Utilize Laser-induced Breakdown Spectroscopy (LIBS) technology, the result who obtains the flue gas pollutant discharging that can real-time online, whether reasonably whether the discharging that these results can be used as flue gas pollutant conformance with standard, and whether comburant meets the demands, and combustion process foundation.
The utility model is used for flue gas and detects pollutants such as magnesium, iron, copper, aluminium, lead, chromium, mercury, arsenic.
Compared with prior art, the utlity model has following advantage:
1, can detect pollutant and concentration thereof such as magnesium in the flue gas, iron, copper, aluminium, lead, chromium, mercury, arsenic simultaneously;
2, can carry out real-time, online continuous detecting to pollutants such as the magnesium in the flue gas, iron, copper, aluminium, lead, chromium, mercury, arsenic;
3, do not need that before detection testing sample is carried out early stage and handle, can in time obtain analysis result;
4, transmit and receive the coaxial design of device, spectral signal that can easier test sample;
5, simple in structure, easy to operate, be adapted at using in the coal combustion flue gas pipeline.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is with the curve map of lead element 405.8 nanofeature spectral lines " spectral intensity-concentration " in the detected flue gas of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, the real time on-line detection device of flue gas pollutant is made up of pulse producer 1, pulsed laser 2, time delays device 3, saturating anti-mirror 4, long-focus condenser lens 5, light receiving device 6, optical fiber 7, spectrometer 8, photoelectric detector 9, A/D converter 10 and computing machine 11.Pulse producer 1 connects the external trigger end of pulsed laser 2 and the input end of time delays device 3 respectively; Saturating anti-mirror 4 of the coaxial arrangement of Laser emission direction order and long condenser lens 5 at pulsed laser 2, the receiving end of light receiving device 6 is placed in the coaxial position of anti-mirror 4 reflection directions, the output terminal of light receiving device 6 is connected with the input end of spectrometer 8 by optical fiber 7, and the output terminal of spectrometer 8 is connected to the input end of photoelectric detector 9; The output terminal of time delays device 3 is connected to another input end of photoelectric detector 9, and the output terminal of photoelectric detector 9 is connected to the input end of A/D converter 10, and the output terminal of A/D converter 10 is connected to computing machine 11.
The output wavelength of pulsed laser 2 is 1064 nanometers, and range of laser energy is that 100～500 millis are burnt.
The course of work that the utility model detects flue gas pollutant is: the arrangement of the real time on-line detection device of flue gas pollutant will be satisfied the requirement that the focus that makes long condenser lens 5 is positioned at the sampling spot place of flue gas, after opening this device, pulse producer 1 sends pulse signal for simultaneously pulsed laser 2 and time delays device 3, the external trigger end of pulsed laser 2 is received a pulse signal, pulsed laser 2 just sends a pulse laser, pulse laser is behind saturating anti-mirror 4 and long condenser lens 5, focus on the flue gas, the high energy laser beam that flue gas is focused punctures the formation high-temperature plasma, various materials in the flue gas will be excited to high-energy state, between a last pulse laser and next pulse laser, the various materials of high-energy state will be got back to ground state, in this process, various materials can give off characteristic spectrum separately, after these characteristic spectrums reflex to long condenser lens 5, through saturating anti-mirror 4 reflections, enter light receiving device 6, be transmitted to spectrometer 8 through optical fiber 7 again, 8 pairs of light signal beam split of spectrometer, import photoelectric detector 9 again into, meanwhile, another pulse signal that excites this pulse laser to send simultaneously with pulse producer 1 just in time arrives photoelectric detector 9 through time delays device 3, trigger photoelectric detector 9 collection of opening the door, and convert the light signal that collects to electric signal, electric signal transfers simulating signal to digital signal through A/D converter 10, imports computing machine 11 analyzing and processing.Computing machine 11 is with the flue gas sample Laser-induced Breakdown Spectroscopy that obtains, and according to gained atomic emission spectrum characteristic light spectral line, the composition of its sample internal contamination thing of analysis and judgement is calculated the contained concentration of this material according to the intensitometer of each characteristic spectral line again.
The fundamental formular of emission spectrum quantitative test is Roman gold-Sai Bai (Lomakin-Scheibe) formula:
Signal imports computing machine 11 analyzing and processing.Computing machine 11 is with the flue gas sample Laser-induced Breakdown Spectroscopy that obtains, and according to gained atomic emission spectrum characteristic light spectral line, the composition of its sample internal contamination thing of analysis and judgement is calculated the contained concentration of this material according to the intensitometer of each characteristic spectral line again.
The fundamental formular of emission spectrum quantitative test is Roman gold-Sai Bai (Lomakin-Scheibe) formula:
I＝aC
b
I is line strength in the formula, and a is a constant, belongs to systematic error, and is relevant with hardware system parameter and environmental factor etc., and b is called self absorption factor, and is relevant with the content of element, and C is the concentration of element.Following formula is taken the logarithm, then:
lgI＝blgC+lga
Following formula shows, under the stable situation of experiment condition, it is linear that constituent content gets logarithm lgC in line strength logarithm lgI and the plasma.Therefore, when concentration of element C is known, measure line strength I, just can obtain constant a.After constant a determines,, just can obtain the content of the element of surveying, the ultimate principle of emission spectrum quantitative test that Here it is by measuring spectral line line strength I.
Fig. 2 is with the curve map of lead element 405.8 nanofeature spectral lines " spectral intensity-concentration " in the detected flue gas of the utility model.Wherein, horizontal ordinate is the logarithm lgC of constituent content, and ordinate is line strength logarithm lgI, the linearity 0.99, and slope 0.41, promptly self absorption factor is 0.41.
Claims (2)
1, the real time on-line detection device of flue gas pollutant, it is characterized in that this device is made up of pulse producer (1), pulsed laser (2), time delays device (3), saturating anti-mirror (4), long-focus condenser lens (5), light receiving device (6), optical fiber (7), spectrometer (8), photoelectric detector (9), A/D converter (10) and computing machine (11); Pulse producer (1) connects the external trigger end of pulsed laser (2) and the input end of time delays device (3) respectively; Laser emission direction order saturating anti-mirror of coaxial arrangement (4) and long condenser lens (5) at pulsed laser (2), the receiving end of light receiving device (6) is placed in the coaxial position of anti-mirror (4) reflection direction, the output terminal of light receiving device (6) is connected with the input end of spectrometer (8) by optical fiber (7), and the output terminal of spectrometer (8) is connected to the input end of photoelectric detector (9); The output terminal of time delays device (3) is connected to another input end of photoelectric detector (9), and the output terminal of photoelectric detector (9) is connected to the input end of A/D converter (10), and the output terminal of A/D converter (10) is connected to computing machine (11).
2, the real time on-line detection device of flue gas pollutant according to claim 1 is characterized in that, the output wavelength of described pulsed laser (2) is 1064 nanometers, and laser energy is that 100～500 millis are burnt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200656985U CN201152851Y (en) | 2008-02-20 | 2008-02-20 | Flue gas pollution substance real-time on-line detection apparatus |
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| CNU2008200656985U CN201152851Y (en) | 2008-02-20 | 2008-02-20 | Flue gas pollution substance real-time on-line detection apparatus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865905A (en) * | 2010-05-19 | 2010-10-20 | 重庆大学 | Mercury concentration on-line detection method in smoke gas |
| CN102507509A (en) * | 2011-10-24 | 2012-06-20 | 中南民族大学 | Real-time online detection analyzer for toxic particle in flue gas |
| CN102928260A (en) * | 2012-11-26 | 2013-02-13 | 力合科技（湖南）股份有限公司 | Fume heavy metal particle absorbing system and method |
| CN103091289A (en) * | 2012-12-21 | 2013-05-08 | 吉林大学 | Automatic experimental platform based on laser-induced breakdown spectroscopy analysis technology |
| CN109374596A (en) * | 2018-11-08 | 2019-02-22 | 天津大学 | Portable flue gas heavy metal element detection system based on laser induced breakdown spectroscopy |
-
2008
- 2008-02-20 CN CNU2008200656985U patent/CN201152851Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865905A (en) * | 2010-05-19 | 2010-10-20 | 重庆大学 | Mercury concentration on-line detection method in smoke gas |
| CN101865905B (en) * | 2010-05-19 | 2013-02-20 | 重庆大学 | Mercury concentration on-line detection method in smoke gas |
| CN102507509A (en) * | 2011-10-24 | 2012-06-20 | 中南民族大学 | Real-time online detection analyzer for toxic particle in flue gas |
| CN102928260A (en) * | 2012-11-26 | 2013-02-13 | 力合科技（湖南）股份有限公司 | Fume heavy metal particle absorbing system and method |
| CN103091289A (en) * | 2012-12-21 | 2013-05-08 | 吉林大学 | Automatic experimental platform based on laser-induced breakdown spectroscopy analysis technology |
| CN103091289B (en) * | 2012-12-21 | 2014-12-03 | 吉林大学 | Automatic experimental platform based on laser-induced breakdown spectroscopy analysis technology |
| CN109374596A (en) * | 2018-11-08 | 2019-02-22 | 天津大学 | Portable flue gas heavy metal element detection system based on laser induced breakdown spectroscopy |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081119 Termination date: 20100220 |