CN102788764A - Ultraviolet analyzer and detection method for low concentration smoke - Google Patents
Ultraviolet analyzer and detection method for low concentration smoke Download PDFInfo
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- CN102788764A CN102788764A CN2012102983268A CN201210298326A CN102788764A CN 102788764 A CN102788764 A CN 102788764A CN 2012102983268 A CN2012102983268 A CN 2012102983268A CN 201210298326 A CN201210298326 A CN 201210298326A CN 102788764 A CN102788764 A CN 102788764A
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Abstract
The invention relates to an ultraviolet analyzer for low concentration smoke and a detection method for the low concentration smoke and provides the ultraviolet analyzer for the low concentration smoke with effects of high precision and reliability. A gaseous pollutant detection unit (8) of the ultraviolet analyzer and the detection method for the low concentration smoke comprises an ultraviolet source (10) and a chopper (11) behind the ultraviolet source (10); a measurement gas chamber (12), a light filter (13) and a solid detector (14) are distributed behind the chopper (11) along a light path direction; the measurement gas chamber (12) is respectively divided into a sample cell (18) and a reference cell (19) along the light path direction; a standard gas is sealed in the reference cell (19); and the sample cell (18) is provided with a sample gas inlet (16) and a sample gas outlet (17) of the sample cell so that high-precision measurement is carried out on the smoke. With the adoption of an ultraviolet light guide detector, multiple light signals can be simultaneously detected, and the ultraviolet light guide detector is superior to a photomultiplier or a microflow sensor in the aspects of noise and quantization efficiency. The ultraviolet analyzer and the detection method for the low concentration smoke can be suitable for SO2 (sulfur dioxide) low concentration smoke, and also can be applied to the detection of the smoke such as low concentration NO2 (nitric oxide) and the like.
Description
Technical field
The invention belongs to the flue gas monitoring apparatus field, especially a kind of low-concentration flue gas uv analyzer and detection method.
Background technology
Existing light concentration gas online test method adopts the non-dispersive ultra-violet absorption spectrometry that finding is also arranged.They all are that the molecule in the sample can absorb the light of some wavelength through after the ultraviolet monochromatic source irradiation sample gas; There is not absorbed light to arrive detecting device.After detecting device detects this light intensity, produce ac voltage signal, signal through the Computing analysis, obtains the corresponding absorbance of gas after processing and amplifying.Because trap is proportional to the concentration of this composition in the sample, utilizes the size and the spectrum of the absorbance that obtains, and, can carry out quantitative Accurate Analysis testing sample gas based on the comparison of absorption with the standard specimen of concentration known.
The core component of above-mentioned detection method is a detecting device, and it is in the majority to use ultravioplet photomultiplier.For example: application number is that 200910135826.8 Chinese invention patent application discloses a kind of intelligent ultraviolet gas analyzer product; It is by ultraviolet source, spike interference filter, measurement air chamber, reference sidelight photodetector and measure the sidelight photodetector and form, and it is characterized in that: the side in the exit of ultraviolet source is provided with a rotatable halo of cutting; This invention has been divided into twin-beam through partially reflecting mirror with incident light, gets into respectively to measure air chamber, reference cell; Wherein, measure air chamber and be divided into two parts, become the mutual arranged perpendicular of 90 degree with reference cell, and separately respectively correspondence two photodetectors; Detecting device is photomultiplier or photodiode array.
The main deficiency of foregoing invention has:
1) measure air chamber and be divided into two parts, become the mutual arranged perpendicular of 90 degree with reference cell, and corresponding respectively separately two photodetectors, will make comparatively complicacy, huge of structure;
2) two-way light path in the invention scheme; And correspondence has disposed two photodetectors; The ectocine that produces in light path and the circuit separately can't be avoided; And detecting device belong to two generation detecting device, quantization efficiency, noise all are lower than solid-state detector, are difficult to chronically, stably realize the measurement of light concentration gas.
Present solid-state ultraviolet detector replaces traditional ultravioplet photomultiplier to become possibility.Photoconductive detectors and photovoltaic detector are two kinds of main types of solid-state ultraviolet detector.They all are to utilize photoelectric effect to produce electron-hole pair, utilize electric field to separate them again and collect at external circuit, thereby light is surveyed.
Summary of the invention
For solving the problems of the technologies described above, the low-concentration flue gas uv analyzer of a kind of high precision, high reliability is provided, the technical scheme that the present invention adopts is following:
Low-concentration flue gas uv analyzer of the present invention; Comprise cabinet 1, add thermal control units 2, export display unit 3, data acquisition process unit 4, power supply 5; In the cabinet 1 flue gas pipeline is set; Drainage filtration unit 6 is arranged on the flue gas pipeline import; Temperature sensor, pressure transducer, humidity sensor, lambda sensor 7, detection for gaseous contaminants unit 8 are set respectively on the flue gas pipeline, and described detection for gaseous contaminants unit 8 comprises ultraviolet source 10 and is arranged on chopper 11 thereafter, after optical path direction is arranged in chopper, is followed successively by measurement air chamber 12, light filter 13, solid-state detector 14; Measure air chamber 12 and be respectively sample cell 18, reference cell 19 along optical path direction, encapsulation calibrating gas in the reference cell 19, sample cell 18 are established sample cell appearance gas import 16 and sample cell appearance gas outlet 17.
Low-concentration flue gas uv analyzer of the present invention; Described solid-state detector 14 comprises semiconductor piece 20, electrode 21, external circuit lead 22, load 23; Power supply 24 is formed, and wherein, semiconductor piece 20 is arranged on light filter 13 rear portions over against the optical path direction position; Electrode 21 lays respectively at semiconductor piece 20 both sides, is connected with the electrode 21 of semiconductor piece 20 both sides respectively behind external circuit lead 22 series loads 23, the power supply 24.
In the technique scheme, semiconductor piece 20 materials are ZnO.
The calibrating gas of encapsulation is that concentration is 100mg/m in the reference cell 19 of the present invention
3SO
2Or NO
2When gas concentration to be measured exceeds standard, analyser of the present invention will be reported to the police automatically, judge that gas is defective.The gas detection of compatible various concentration if desired, the gas to be measured that can encapsulate certain concentration according to customer requirement is in reference cell.
Low-concentration flue gas ultraviolet detection method of the present invention comprises the steps:
Step 1, in the low-concentration flue gas uv analyzer, feed nitrogen N
2, to nitrogen N
2Be full of sample cell 18;
Step 2, ultraviolet source 10 send monochromatic light, after chopper 11 is cut light, form two-beam; A branch of light arrives detecting sensor 14 through sample cell 18, light filter 13 successively, measures and obtains light intensity I
0Another Shu Guang arrives detecting sensor 14 through reference cell 19, light filter 13 successively, measures and obtains light intensity I
Ginseng
Step 4, nitrogen N
2Discharge;
Step 7, through formula T=I/ I
0, obtain to feed gas transmissivity T to be measured;
Encapsulation calibrating gas concentration is C in step 8, the note reference cell 21
Ginseng
Step 9, through formula C=(logT/logT
Ginseng) C
Ginseng, calculate gas concentration C to be measured.
Principle of the present invention is following: the non-dispersive ultra-violet absorption spectrometry is a kind of novel gas concentration detection method: after non-dispersive ultraviolet monochromatic source irradiation sample gas, the molecule in the sample can absorb the light of some wavelength; There is not absorbed light to arrive detecting device.After detecting device detects this light intensity, produce ac voltage signal, signal through the Computing analysis, obtains the corresponding absorbance of gas after processing and amplifying.Because trap is proportional to the concentration of this composition in the sample, utilizes the size and the spectrum of the absorbance that obtains, and, can carry out quantitative Accurate Analysis testing sample gas based on the comparison of absorption with the standard specimen of concentration known.
The present invention has selected the photovoltaic type structure for use owing to ultraviolet detector, and selects ZnO as semiconductor material, so dark current is less, and ground unrest is lower, and the response time is very fast; And chemical property is stable, can under higher temperature, work, thereby greatly reduce the requirement to cooling system, makes total system designs simplification, weight saving, has reduced cost.
The present invention be directed to the measurement of low concentration SO 2 gas or NO2 gas.The ultraviolet semiconductor detector of selecting for use, its detection sensitivity can be according to gas types to be measured, obtain through regulating embedded high-ohmic resistance.Can only detect a light signal with common used ultravioplet photomultiplier compares; The ultraviolet photoconductive detectors that the present invention adopts can detect a plurality of light signals simultaneously; And all be superior to traditional photomultiplier or microfluidic sensor aspect noise, the quantization efficiency; Antijamming capability is stronger, thereby guarantees that analyser detects high sensitivity, detection limit is low, makes the sensitivity sensing range be implemented in 0 ~ 10 ppm.
The ultraviolet light beam that the present invention utilizes chopper to make single light source send becomes twin-beam; Adopt the twin-beam metric measurement, compare other optical measuring techniques, have following obvious advantage: the effect of monitoring at any time that light intensity changes and the influence that changes is proofreaied and correct through reference light; Can eliminate the intensity of light source automatically and change caused error; Avoid because the measuring error that power-supply fluctuation or light source ages cause has also been eliminated amplifier gain variation and optics and electronics components and parts to two unbalanced influences of light path simultaneously, thereby make that drift reduces, the baseline straightening degree improves; And do not change with variation of temperature, improved the stability of instrument.
The ultraviolet light that the present invention selects for use has wide continuous spectrum and high resolving power; Compare infrared light, electromagnetic wavelength is shorter, and energy is bigger; Can be fast obtain the electrical signal intensity of reflection gas concentration, so antijamming capability is strong, can avoids and eliminate the measurement drift that the factors such as interference of particle, dust, moisture, background gas cause through solid-state detector; Therefore, the largest benefit that adopts the ultra-violet analysis technology is to suppress common mode, and temperature is floated little, has the advantage of on-line measurement good stability.And flue gas SO after the desulfurization of new edition " thermal power plant's air pollution emission standard " regulation, denitration
2And NO
2Emission limit is not higher than 100mg/m
3, NDIR is non-, and the infrared analysis technology of dispersing faces the technical bottleneck that flue gas moisture disturbs and low concentration can't effectively be measured, the measurement requirement that therefore can't be competent at denitration flue gas low concentration;
The industry that the present invention can be benefited has: refining, petrochemical industry and chemical treatment, metallurgical production, hardening heat processing, gas production and distribution, the measurement of inflammable mixture of gas, biotechnology, garbage loading embeading processing, the analysis of boiler flue gas, power plant, process smelting furnace and incinerator, various places CEMS integrator and ring prison station etc.The present invention also can be applicable to the detection to low concentration of NO 2 flue gases such as grade except being suitable for the measurement of SO2 low-concentration flue gas.
Description of drawings
Fig. 1 is the topology layout figure of embodiment of the invention flue gas analyzer.
Fig. 2 is a detection for gaseous contaminants cellular construction synoptic diagram of the present invention.
Fig. 3 is a detection for gaseous contaminants of the present invention unit two-way arrangement synoptic diagram.
Fig. 4 is solid-state detector structural representation (arrow is depicted as ultraviolet source 10 light beam incident directions).
Embodiment
Embodiment 1:
Fig. 1 is the topology layout figure of embodiment of the invention flue gas analyzer; As shown in the figure; Comprise cabinet 1, add thermal control units 2, export display unit 3, data acquisition process unit 4, power supply 5; In the cabinet 1 flue gas pipeline is set; Drainage filtration unit 6 is arranged on the flue gas pipeline import, and temperature sensor, pressure transducer, humidity sensor, lambda sensor 7, detection for gaseous contaminants unit 8 are set respectively on the flue gas pipeline, the detection for gaseous contaminants unit 8 of present embodiment; Detection for gaseous contaminants unit 8 comprises ultraviolet source 10 and is arranged on chopper 11 thereafter, after optical path direction is arranged in chopper, is followed successively by measurement air chamber 12, light filter 13, solid-state detector 14; Measure air chamber 12 and be respectively sample cell 18, reference cell 19 along optical path direction, encapsulation calibrating gas in the reference cell 19, sample cell 18 are established sample cell appearance gas import 16 and sample cell appearance gas outlet 17.The light beam that chopper 11 modulation ultraviolet sources 10 send forms two monochromic beams, and a branch of entering sample cell 18, another bundle get into the alternately irradiation of reference cell 19, two monochromic beams.
In the technique scheme; Solid-state detector 14 can preferred semiconductor photovoltaic type ultraviolet detector, and solid-state detector 14 comprises semiconductor piece 20, electrode 21, external circuit lead 22, load 23, and power supply 24 is formed; Wherein, Semiconductor piece 20 is arranged on light filter 13 rear portions over against the optical path direction position, and electrode 21 lays respectively at semiconductor piece 20 both sides, is connected with the electrode 21 of semiconductor piece 20 both sides respectively behind external circuit lead 22 series loads 23, the power supply 24.The detector detection sensitivity can be according to gas type to be measured, obtain through regulating embedded high-ohmic resistance, detects requirement to satisfy different low concentrations; The adjustable electric resistance is: 12M Ω---450M Ω;
In the technique scheme, semiconductor piece 20 materials are preferably ZnO.
The calibrating gas of encapsulation is that concentration is 100mg/m in the reference cell 19 of the present invention
3SO
2Or NO
2When gas concentration to be measured exceeds standard, analyser of the present invention will be reported to the police automatically, judge that gas is defective.The gas detection of compatible various concentration if desired, the gas to be measured that can encapsulate certain concentration according to customer requirement is in reference cell.
Embodiment 2:
As shown in Figure 2; For improving the utilization ratio of flue gas analyzer; Detection for gaseous contaminants unit 8 laterally arranges two, can measure to different pollutants simultaneously, only need in reference cell 19, encapsulate different calibrating gas and select to think that corresponding solid-state detector gets final product.
For example: solid-state detector 14 is SO
2Solid-state detector can also increase by one road NO again
215, two groups of solid-state detectors of solid-state detector are respectively measures range at 0 ~ 100 ~ 3000 mg/m
3The SO of (double-range)
2The NO of guide type ultraviolet detector and 0 ~ 50 ~ 3000 mg/m3 (double-range)
2The guide type ultraviolet detector.
Embodiment 3:
With SO
2Or NO
2Gas respectively with nitrogen N
2(N
2Absorption peak is less or do not disturb eudiometry to be measured) be mixed with same concentrations C
The SO2 mark=C
The NO2 markThe calibrating gas of=100mg/m3; Be encapsulated in respectively then in the light path of corresponding gas in the reference cell 19.The identical calibrating gas of each reference cell encapsulation gas a kind of and to be measured.
Low-concentration flue gas ultraviolet detection method of the present invention comprises the steps:
Step 1, in the low-concentration flue gas uv analyzer, feed nitrogen N
2, to nitrogen N
2Be full of sample cell 18;
Step 2, ultraviolet source 10 send monochromatic light, after chopper 11 is cut light, form two-beam; A branch of light arrives detecting sensor 14 through sample cell 18, light filter 13 successively, measures and obtains light intensity I
0Another Shu Guang arrives detecting sensor 14 through reference cell 19, light filter 13 successively, measures and obtains light intensity I
Ginseng
Step 4, nitrogen N
2Discharge;
Step 7, through formula T=I/ I
0, obtain to feed gas transmissivity T to be measured;
Encapsulation calibrating gas concentration is C in step 8, the note reference cell 21
Ginseng
Step 9, through formula C=(logT/logT
Ginseng) C
Ginseng, calculate gas concentration C to be measured.
Again through data acquisition process unit 4 and output display unit 3, the concentration value of promptly exportable gas NO to be measured or CO.
When carrying out above-mentioned measuring process; Through humidity sensor, temperature sensor and the pressure transducer in the flue gas measuring multiple parameters chamber 9; Record humidity, three parameters of temperature and pressure in advance, obtain the ambient parameter data of gas to be measured, thereby obtain the standard state condition.
Claims (5)
1. low-concentration flue gas uv analyzer; Comprise cabinet (1), add thermal control units (2), export display unit (3), data acquisition process unit (4), power supply (5); Cabinet is provided with flue gas pipeline in (1); Drainage filtration unit (6) is arranged on the flue gas pipeline import; Temperature sensor, pressure transducer, humidity sensor, lambda sensor (7), detection for gaseous contaminants unit (8) are set respectively on the flue gas pipeline; It is characterized in that: described detection for gaseous contaminants unit (8) comprises ultraviolet source (10) and is arranged on chopper (11) thereafter, after optical path direction is arranged in chopper, is followed successively by measurement air chamber (12), light filter (13), solid-state detector (14); Measure air chamber (12) and be respectively sample cell (18), reference cell (19) along optical path direction, encapsulation calibrating gas in the reference cell (19), sample cell (18) is established sample cell appearance gas import (16) and sample cell appearance gas outlet (17).
2. low-concentration flue gas uv analyzer according to claim 1; It is characterized in that: described solid-state detector (14) comprises semiconductor piece (20), electrode (21), external circuit lead (22), load (23); Power supply (24) is formed; Wherein, Semiconductor piece (20) is arranged on light filter (13) rear portion over against the optical path direction position, and electrode (21) lays respectively at semiconductor piece (20) both sides, is connected with the electrode (21) of semiconductor piece (20) both sides respectively behind external circuit lead (22) series load (23), the power supply (24).
3. low-concentration flue gas uv analyzer according to claim 2 is characterized in that: described semiconductor piece (20) material is ZnO.
4. low-concentration flue gas uv analyzer according to claim 1 is characterized in that: the calibrating gas of encapsulation is that concentration is 100mg/m in the reference cell (19)
3SO
2Or NO
2
5. a low-concentration flue gas ultraviolet detection method is characterized in that comprising the steps:
Step 1, in the low-concentration flue gas uv analyzer, feed nitrogen N
2, to nitrogen N
2Be full of sample cell (18);
Step 2, ultraviolet source (10) send monochromatic light, after chopper (11) is cut light, form two-beam; A branch of light arrives detecting sensor (14) through sample cell (18), light filter (13) successively, measures to obtain light intensity I
0Another Shu Guang arrives detecting sensor (14) through reference cell (19), light filter (13) successively, measures to obtain light intensity I
Ginseng
Step 3, through formula T
Ginseng=I
Ginseng/ I
0, obtain to feed nitrogen N
2Transmissivity T
Ginseng
Step 4, nitrogen N
2Discharge;
Step 5, gas to be measured is fed the low-concentration flue gas uv analyzer, behind drainage filtration unit (6) filtration drying, be full of sample cell (18);
Step 6, ultraviolet source (10) send monochromatic light, after chopper (11) is cut light, form two-beam; A branch of light arrives detecting sensor (14) through sample cell (18), light filter (13) successively, measures to obtain light intensity I;
Step 7, through formula T=I/ I
0, obtain to feed gas transmissivity T to be measured;
Encapsulation calibrating gas concentration is C in step 8, the note reference cell (21)
Ginseng
Step 9, through formula C=(logT/logT
Ginseng) C
Ginseng, calculate gas concentration C to be measured.
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|---|---|---|---|
| CN2012102983268A CN102788764A (en) | 2012-08-21 | 2012-08-21 | Ultraviolet analyzer and detection method for low concentration smoke |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102983268A CN102788764A (en) | 2012-08-21 | 2012-08-21 | Ultraviolet analyzer and detection method for low concentration smoke |
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| CN104458626A (en) * | 2014-12-05 | 2015-03-25 | 力合科技（湖南）股份有限公司 | Gas analyzer |
| CN105572067A (en) * | 2015-12-14 | 2016-05-11 | 重庆川仪自动化股份有限公司 | Flue gas concentration measuring method based on spectrum analysis |
| CN106124441A (en) * | 2016-06-21 | 2016-11-16 | 杭州泽天科技有限公司 | A kind of return ultralow range uv analyzer of single and the method for analysis thereof |
| CN106290209A (en) * | 2016-08-04 | 2017-01-04 | 安徽蓝盾光电子股份有限公司 | A kind of minimum discharge flue gas analyzer based on ultraviolet multiple reflections pool technology |
| CN107340254A (en) * | 2017-03-29 | 2017-11-10 | 宁波方太厨具有限公司 | Hand-held organic matter detection terminal and its detection method |
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| CN107339741A (en) * | 2017-03-29 | 2017-11-10 | 宁波方太厨具有限公司 | A kind of air cleaning system |
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| CN108226069A (en) * | 2018-01-17 | 2018-06-29 | 南开大学 | A kind of sulfur dioxide detection device |
| CN109030693A (en) * | 2018-09-03 | 2018-12-18 | 大连技嘉科技有限公司 | Convenient for the single light source two-way detector of light modulation |
| CN109772490A (en) * | 2019-01-22 | 2019-05-21 | 福建师范大学 | A kind of specimen holder for sample detection |
| CN111175236A (en) * | 2020-01-09 | 2020-05-19 | 中国原子能科学研究院 | Light path correction method and device for baseline drift in glove box type online spectral analysis |
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| US11132883B2 (en) | 2016-11-11 | 2021-09-28 | Carrier Corporation | High sensitivity fiber optic based detection |
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