CN202837176U - Low concentration flue gas ultraviolet analyzer - Google Patents
Low concentration flue gas ultraviolet analyzer Download PDFInfo
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- CN202837176U CN202837176U CN201220414769.4U CN201220414769U CN202837176U CN 202837176 U CN202837176 U CN 202837176U CN 201220414769 U CN201220414769 U CN 201220414769U CN 202837176 U CN202837176 U CN 202837176U
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- flue gas
- gas
- low concentration
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- ultraviolet
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Abstract
The utility model provides a low concentration flue gas ultraviolet analyzer which is high in precision and high in reliability. A gaseous pollutant detection unit 8 of the low concentration flue gas ultraviolet analyzer comprises an ultraviolet source 10 and a chopper 11 arranged behind the ultraviolet source 10. A measuring air chamber 12, a light filter 13, and a solid detector 14 are arranged behind the chopper in sequence along the light path direction. The measuring air chamber 12 is divided into a sample cell 18 and a reference cell 19 respectively along the light path direction, standard gas is contained in the reference cell 19 in a sealing mode, and a sample cell sample gas inlet 16 and a sample cell sample gas outlet 17 are formed in the sample cell 18 to conduct high precision measuring of flue gas. An ultraviolet light guide type probe adopted for the low concentration flue gas ultraviolet analyzer is capable of detecting a plurality of optical signals simultaneously, and is superior to a traditional photomultiplier or a microflow sensor in noise and quantization efficiency aspects. The low concentration flue gas ultraviolet analyzer is suitable for measuring of SO2 low concentration flue gas, and can also be applied to detecting of low concentration NO2 flue gas and other flue gases.
Description
Technical field
The invention belongs to the flue gas monitoring apparatus field, especially a kind of low-concentration flue gas uv analyzer.
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 by 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 by the Computing analysis, obtains absorbance corresponding to gas after amplifying processing.Because absorbance log is proportional to the concentration of this composition in the sample, utilizes size and the spectrum of the absorbance that obtains, and according to the comparison of absorption with the standard specimen of concentration known, can carry out quantitative Accurate Analysis to testing sample gas.
The core component of above-mentioned detection method is detecting device, uses ultravioplet photomultiplier in the majority.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 by partially reflecting mirror with incident light, enters respectively to measure air chamber, reference cell; Wherein, measure air chamber and reference cell and be divided into two parts, become the mutual arranged perpendicular of 90 degree, and corresponding respectively separately two photodetectors; Detecting device is photomultiplier or photodiode array.
The main deficiency of foregoing invention has:
1) measure air chamber and reference cell and be divided into two parts, become the mutual arranged perpendicular of 90 degree, and corresponding respectively separately two photodetectors, will make structure comparatively complicated, huge;
2) two-way light path in the invention scheme, and correspondence has configured 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, and the recycling electric field separates them and collects 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 solution used in the present invention is as follows:
Low-concentration flue gas uv analyzer of the present invention, comprise cabinet 1, add thermal control units 2, output display unit 3, data acquisition process unit 4, power supply 5, the cabinet 1 interior flue gas pipeline that arranges, drainage filtration unit 6 is arranged on the flue gas pipeline import, difference set temperature sensor on the flue gas pipeline, pressure transducer, humidity sensor, lambda sensor 7, detection for gaseous contaminants unit 8, described detection for gaseous contaminants unit 8 comprises ultraviolet source 10 and is arranged on thereafter chopper 11, measures air chamber 12 along being followed successively by after optical path direction is arranged in chopper, light filter 13, solid-state detector 14; Measure air chamber 12 and be respectively sample cell 18, reference cell 19 along optical path direction, reference cell 19 interior encapsulation calibrating gas, sample cell 18 are established sample cell sample gas import 16 and sample cell sample 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 wire 22, load 23, power supply 24, 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, and external circuit wire 22 series loads 23, power supply 24 are rear to be connected with the electrode 21 of semiconductor piece 20 both sides respectively.
In the technique scheme, semiconductor piece 20 materials are ZnO.
The calibrating gas of reference cell 19 interior encapsulation of the present invention is that concentration is 100mg/m
3SO
2Or NO
2When gas concentration to be measured exceeded standard, analyser of the present invention judged that with automatic alarm gas is defective.If need the gas of compatible various concentration to detect, can encapsulate the gas to be measured of certain concentration in reference cell according to customer requirement.
Low-concentration flue gas ultraviolet detection method of the present invention comprises the steps:
Step 1, in the low-concentration flue gas uv analyzer, pass into nitrogen N
2, to nitrogen N
2Be full of sample cell 18;
Step 2, ultraviolet source 10 send monochromatic light, form two-beam after chopper 11 is cut light; Light beam arrives detecting sensor 14 by sample cell 18, light filter 13 successively, measures and obtains light intensity I
0Light beam arrives detecting sensor 14 by reference cell 19, light filter 13 successively in addition, measures and obtains light intensity I
Ginseng
Step 3, by formula T
Ginseng=I
Ginseng/ I
0, obtain to pass into nitrogen N
2Transmissivity T
Ginseng
Step 4, nitrogen N
2Discharge;
Step 5, gas to be measured is passed into the low-concentration flue gas uv analyzer, behind drainage filtration unit 6 filtration dryings, be full of sample cell 18;
Step 6, ultraviolet source 10 send monochromatic light, form two-beam after chopper 11 is cut light; Light beam arrives detecting sensor 14 by sample cell 18, light filter 13 successively, measures and obtains light intensity I;
Step 7, by formula T=I/ I
0, obtain to pass into gas transmissivity T to be measured;
Step 8, note reference cell 21 interior encapsulation calibrating gas concentration are C
Ginseng
Step 9, by formula C=(logT/logT
Ginseng) C
Ginseng, calculate gas concentration C to be measured.
Principle of the present invention is as follows: 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 by the Computing analysis, obtains absorbance corresponding to gas after amplifying processing.Because absorbance log is proportional to the concentration of this composition in the sample, utilizes size and the spectrum of the absorbance that obtains, and according to the comparison of absorption with the standard specimen of concentration known, can carry out quantitative Accurate Analysis to testing sample gas.
The present invention has selected the photovoltaic type structure 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 stable chemical nature can be worked under higher temperature, thereby greatly reduces the requirement to cooling system, makes whole 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, its detection sensitivity can be according to gas types to be measured, obtain by 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 better than traditional photomultiplier or microfluidic sensor aspect noise, the quantization efficiency, antijamming capability is stronger, thereby guarantee that analyser detects high sensitivity, detection limit is low, the sensitivity sensing range is realized at 0 ~ 10 ppm.
The present invention utilizes chopper so that the ultraviolet light beam that single light source sends becomes twin-beam, adopt the twin-beam metric measurement, compare other optical measuring techniques, has following obvious advantage: the effect of monitoring at any time that light intensity changes and the impact that changes is proofreaied and correct by reference light, can automatically eliminate the intensity of light source and change caused error, avoid because the measuring error that power-supply fluctuation or light source ages cause, simultaneously amplifier gain variation and optics and electronics components and parts have also been eliminated to two unbalanced impacts of light path, thereby so that drift reduces, the baseline straightening degree improves, and variation with temperature and changing not, improved the stability of instrument.
The ultraviolet light that the present invention selects has wide continuous spectrum and high resolving power; Compare infrared light, electromagnetic wavelength is shorter, and energy is larger; Can be fast obtain the electrical signal intensity of reflection gas concentration by solid-state detector, 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; Therefore, the largest benefit that adopts the ultra-violet analysis technology is to suppress common mode, and temperature is floated little, has advantages of the on-line measurement good stability.And flue gas SO behind new edition " thermal power plant's air pollution emission standard " the regulation desulphurization and 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, and therefore can't be competent at the measurement requirement of 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 detection for gaseous contaminants cellular construction schematic diagram of the present invention.
Fig. 3 is detection for gaseous contaminants of the present invention unit two-way arrangement schematic 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, output display unit 3, data acquisition process unit 4, power supply 5, the cabinet 1 interior flue gas pipeline that arranges, drainage filtration unit 6 is arranged on the flue gas pipeline import, difference set temperature sensor on the flue gas pipeline, pressure transducer, humidity sensor, lambda sensor 7, detection for gaseous contaminants unit 8, the detection for gaseous contaminants unit 8 of the present embodiment, detection for gaseous contaminants unit 8 comprises ultraviolet source 10 and is arranged on thereafter chopper 11, measures air chamber 12 along being followed successively by after optical path direction is arranged in chopper, light filter 13, solid-state detector 14; Measure air chamber 12 and be respectively sample cell 18, reference cell 19 along optical path direction, reference cell 19 interior encapsulation calibrating gas, sample cell 18 are established sample cell sample gas import 16 and sample cell sample gas outlet 17.The light beam that chopper 11 modulation ultraviolet sources 10 send forms two monochromic beams, and a branch of sample cell 18 that enters, another bundle enter 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, solid-state detector 14 comprises semiconductor piece 20, electrode 21, external circuit wire 22, load 23, power supply 24, 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, and external circuit wire 22 series loads 23, power supply 24 are rear to be connected with the electrode 21 of semiconductor piece 20 both sides respectively.The detector detection sensitivity can be according to gas type to be measured, obtain by regulating embedded high-ohmic resistance, to satisfy different low concentration testing requirements; The adjustable electric resistance is: 12M Ω---450M Ω;
In the technique scheme, semiconductor piece 20 materials are preferably ZnO.
The calibrating gas of reference cell 19 interior encapsulation of the present invention is that concentration is 100mg/m
3SO
2Or NO
2When gas concentration to be measured exceeded standard, analyser of the present invention judged that with automatic alarm gas is defective.If need the gas of compatible various concentration to detect, can encapsulate the gas to be measured of certain concentration in reference cell according to customer requirement.
Embodiment 2:
As shown in Figure 2, for improving the utilization ratio of flue gas analyzer, detection for gaseous contaminants unit 8 be arranged two in parallel, can measure for different pollutants simultaneously, only need to encapsulate different calibrating gas and select to think that corresponding solid-state detector gets final product in reference cell 19.
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)
2Photoconductive UV detector and 0 ~ 50 ~ 3000 mg/m3(double-ranges) NO
2Photoconductive UV 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; Then be encapsulated in respectively 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, pass into nitrogen N
2, to nitrogen N
2Be full of sample cell 18;
Step 2, ultraviolet source 10 send monochromatic light, form two-beam after chopper 11 is cut light; Light beam arrives detecting sensor 14 by sample cell 18, light filter 13 successively, measures and obtains light intensity I
0Light beam arrives detecting sensor 14 by reference cell 19, light filter 13 successively in addition, measures and obtains light intensity I
Ginseng
Step 3, by formula T
Ginseng=I
Ginseng/ I
0, obtain to pass into nitrogen N
2Transmissivity T
Ginseng
Step 4, nitrogen N
2Discharge;
Step 5, gas to be measured is passed into the low-concentration flue gas uv analyzer, behind drainage filtration unit 6 filtration dryings, be full of sample cell 18;
Step 6, ultraviolet source 10 send monochromatic light, form two-beam after chopper 11 is cut light; Light beam arrives detecting sensor 14 by sample cell 18, light filter 13 successively, measures and obtains light intensity I;
Step 7, by formula T=I/ I
0, obtain to pass into gas transmissivity T to be measured;
Step 8, note reference cell 21 interior encapsulation calibrating gas concentration are C
Ginseng
Step 9, by formula C=(logT/logT
Ginseng) C
Ginseng, calculate gas concentration C to be measured.
Again by data acquisition process unit 4 and output display unit 3, the i.e. concentration value of exportable gas NO to be measured or CO.
When carrying out above-mentioned measuring process, by humidity sensor, temperature sensor and the pressure transducer in the flue gas measuring multiple parameters chamber 9, record in advance humidity, three parameters of temperature and pressure, obtain the ambient parameter data of gas to be measured, thereby obtain the standard state condition.
Claims (3)
1. low-concentration flue gas uv analyzer, comprise cabinet (1), add thermal control units (2), output display unit (3), data acquisition process unit (4), power supply (5), cabinet arranges flue gas pipeline in (1), drainage filtration unit (6) is arranged on the flue gas pipeline import, difference set temperature sensor on the flue gas pipeline, pressure transducer, humidity sensor, lambda sensor (7), detection for gaseous contaminants unit (8), it is characterized in that: described detection for gaseous contaminants unit (8) comprises ultraviolet source (10) and is arranged on thereafter chopper (11), measures air chamber (12) along being followed successively by after optical path direction is arranged in chopper, 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 sample gas import (16) and sample cell sample gas outlet (17), and the calibrating gas of encapsulation is that concentration is 100mg/m in the reference cell (19)
3SO
2Or NO
2
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 wire (22), load (23), power supply (24), wherein, semiconductor piece (20) is arranged on light filter (13) rear portion 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 wire (22) series load (23), the power supply (24).
3. low-concentration flue gas uv analyzer according to claim 2, it is characterized in that: described semiconductor piece (20) material is ZnO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220414769.4U CN202837176U (en) | 2012-08-21 | 2012-08-21 | Low concentration flue gas ultraviolet analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220414769.4U CN202837176U (en) | 2012-08-21 | 2012-08-21 | Low concentration flue gas ultraviolet analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202837176U true CN202837176U (en) | 2013-03-27 |
Family
ID=47948856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220414769.4U Expired - Lifetime CN202837176U (en) | 2012-08-21 | 2012-08-21 | Low concentration flue gas ultraviolet analyzer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202837176U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788764A (en) * | 2012-08-21 | 2012-11-21 | 南京埃森环境技术有限公司 | Ultraviolet analyzer and detection method for low concentration smoke |
| CN106546544A (en) * | 2016-11-04 | 2017-03-29 | 长沙在线仪器设备有限公司 | A kind of double beam spectrophotometer based on aqueous solution electrolysis colour developing principle |
-
2012
- 2012-08-21 CN CN201220414769.4U patent/CN202837176U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788764A (en) * | 2012-08-21 | 2012-11-21 | 南京埃森环境技术有限公司 | Ultraviolet analyzer and detection method for low concentration smoke |
| CN106546544A (en) * | 2016-11-04 | 2017-03-29 | 长沙在线仪器设备有限公司 | A kind of double beam spectrophotometer based on aqueous solution electrolysis colour developing principle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 210042, Jiangsu province Nanjing Xuanwu Avenue 699-8 Xu Zhuang Software Park Development Zone 3, 1 Patentee after: NANJING ASSEN ENVIRONMENT TECHNOLOGY CO.,LTD. Address before: 210042, room 3, building 699-8, Xuanwu Avenue, Xuanwu District, Jiangsu, Nanjing, 102 Patentee before: NANJING ASSEN ENVIRONMENT TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |