CN105445066A - On-line monitoring device and method for VOCs (volatile organic compounds) in flue gas - Google Patents
On-line monitoring device and method for VOCs (volatile organic compounds) in flue gas Download PDFInfo
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- CN105445066A CN105445066A CN201511031174.5A CN201511031174A CN105445066A CN 105445066 A CN105445066 A CN 105445066A CN 201511031174 A CN201511031174 A CN 201511031174A CN 105445066 A CN105445066 A CN 105445066A
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- chromatograph
- flue gas
- pump
- voc
- sampling unit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
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- General Health & Medical Sciences (AREA)
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- Analytical Chemistry (AREA)
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- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides an on-line monitoring device and method for VOCs (volatile organic compounds) in flue gas. The on-line monitoring device comprises a sampling unit, a chromatograph, a pump, a switching unit and a second pressure gauge, wherein the sampling unit is used for sampling to-be-detected flue gas; the chromatograph is arranged in the downstream position of the sampling unit, is connected with the sampling unit and comprises a chromatographic column and a first pressure gauge arranged in the downstream position of the chromatographic column; the pump is arranged in the downstream position of the chromatograph and is connected with the chromatograph; the switching unit is used for selectively enabling the sampling unit to be communicated with the pump through or without the chromatograph; the second pressure gauge is arranged between the sampling unit and the chromatograph. The on-line monitoring device has the advantages of high reliability and the like.
Description
Technical field
The present invention relates to flue gas monitoring, particularly VOC on-Line Monitor Device and method in flue gas.
Background technology
At present, though country starts pollute industry gaseous state VOC monitoring comprehensively, gaseous state VOC on-line checkingi standard is not yet proposed.
Fig. 1 schematically illustrates gaseous state VOC in U.S. EPA standard and monitors the structural drawing of malleation sampling device, and as shown in Figure 1, use high-temperature pump to extract flue gas, the gas of extraction is transported to chromatogram instrument by the pressure after pump and carries out sample introduction, analysis.The deficiency of this device is mainly:
1. serviceable life is short, correspondingly improves operating cost.The hydraulic performance decline of high-temperature pump is comparatively obvious, often occurs that pump motor coil burns out, pump diaphragm blocks, pump diaphragm burn into pump motor fatigue, the general use high-temperature pump that half a year, just needs replacing was expensive;
2. pump valve inner materials has certain adsorption effect to VOC;
3. when the equilibrium analysis of chromatogram instrument, pump quits work gaseous sample flow stagnation in the pipeline that brings, needs the longer time to displace stagnant gas in original pipeline, cause the measurement real-time of the gas of flue inside not enough during next sample introduction.
Summary of the invention
In order to solve the deficiency in above-mentioned prior art, the invention provides VOC on-Line Monitor Device in a kind of flue gas, achieve negative pressure down-sampling, and chromatographic sample introduction, balance, analysis is realized under negative pressure state, decrease flue gas loss during the course, and improve reliability and decrease maintenance frequency.
The object of the invention is to be achieved through the following technical solutions:
VOC on-Line Monitor Device in a kind of flue gas, in described flue gas, VOC on-Line Monitor Device comprises:
Sampling unit, described sampling unit is for sampling flue gas to be measured;
Chromatograph, described chromatograph is arranged on the downstream of described sampling unit, and connects described sampling unit; Described chromatograph comprises chromatographic column, the first pressure gauge, and described first pressure gauge is arranged on the downstream of described chromatographic column;
Pump, described pump is arranged on described chromatographic downstream, and connects described chromatograph;
Switch unit, described switch unit is used for optionally making described sampling unit pass through or not be communicated with described pump by described chromatograph;
Second pressure gauge, described second pressure gauge is arranged between described sampling unit and chromatograph.
According to VOC on-Line Monitor Device in above-mentioned flue gas, preferably, described switch unit is T-valve, is arranged between described chromatograph and pump or sampling unit.
According to VOC on-Line Monitor Device in above-mentioned flue gas, preferably, described pump is ejector.
Present invention also offers VOC on-line monitoring method in flue gas, achieve negative pressure down-sampling, and realize chromatographic sample introduction, balance, analysis under negative pressure state, decrease flue gas loss during the course, and improve reliability and decrease maintenance frequency.This goal of the invention is achieved through the following technical solutions:
VOC on-line monitoring method in flue gas, in described flue gas, VOC on-line monitoring method comprises the following steps:
(A1) under the effect of pump, the flue gas in environment to be measured is sampled;
(A2) flue gas sampled is successively by chromatograph and described pump, and chromatograph completes sample introduction;
(A3) flue gas sampled does not enter described pump by described chromatograph, makes the pressure equilibrium of chromatographic column upstream and downstream in described chromatograph;
(A4) described chromatograph knows VOC content in flue gas by analyzing.
Compared with prior art, the beneficial effect that the present invention has is:
1. installation cost is low, and reliability is high, decreases maintenance frequency;
2. pump is arranged on chromatographic downstream, decreases the absorption of pump valve for gaseous state VOC;
3. add fast loop, sampling lag can be reduced when chromatograph balances;
4. realizing sample introduction under negative pressure measuring method with demarcating balances, and the pressure compensation that sample introduction and demarcation switch.
Accompanying drawing explanation
With reference to accompanying drawing, disclosure of the present invention will be easier to understand.Those skilled in the art it is easily understood that: these accompanying drawings only for illustrating technical scheme of the present invention, and and are not intended to be construed as limiting protection scope of the present invention.In figure:
Fig. 1 is the structure diagram of the sampling device according to prior art;
Fig. 2 is the structure diagram of VOC on-Line Monitor Device in the flue gas according to the embodiment of the present invention 2;
Fig. 3 is the structure diagram of VOC on-Line Monitor Device in the flue gas according to the embodiment of the present invention 3;
Fig. 4 is the structure diagram of VOC on-Line Monitor Device in the flue gas according to the embodiment of the present invention 4.
Embodiment
Fig. 2-4 and following description describe Alternate embodiments of the present invention and how to implement to instruct those skilled in the art and to reproduce the present invention.In order to instruct technical solution of the present invention, simplifying or having eliminated some conventional aspects.Those skilled in the art should understand that the modification that is derived from these embodiments or replace will within the scope of the invention.Those skilled in the art should understand that following characteristics can combine to form multiple modification of the present invention in every way.Thus, the present invention is not limited to following Alternate embodiments, and only by claim and their equivalents.
Embodiment 1:
VOC on-Line Monitor Device in the flue gas of the embodiment of the present invention, described on-Line Monitor Device comprises:
Sampling unit, described sampling unit is arranged on chimney or flue, for sampling flue gas to be measured;
Chromatograph, described chromatograph is arranged on the downstream of described sampling unit, and connects described sampling unit; Described chromatograph comprises chromatographic column, the first pressure gauge, and described first pressure gauge is arranged on the downstream of described chromatographic column;
Pump, as ejector, described pump is arranged on described chromatographic downstream, and connects described chromatograph;
Switch unit, as the combination of a T-valve or two retaining valves, described switch unit be used for optionally making described sampling unit by or be not communicated with described pump by described chromatograph;
Second pressure gauge, described second pressure gauge is arranged between described sampling unit and chromatograph.
VOC on-line monitoring method in flue gas, be also the course of work of above-mentioned on-Line Monitor Device, in described flue gas, VOC on-line monitoring method comprises the following steps:
(A1) under the effect of pump, the flue gas in environment to be measured is sampled;
(A2) by the switching of above-mentioned switch unit, the flue gas of sampling is successively by chromatograph and described pump, and chromatograph completes sample introduction;
(A3) by the switching of above-mentioned switch unit, the flue gas of sampling does not enter described pump by described chromatograph, makes the pressure equilibrium of chromatographic column upstream and downstream in described chromatograph;
(A4) described chromatograph knows VOC content in flue gas by analyzing.
Embodiment 2:
According to the on-Line Monitor Device of the embodiment of the present invention 1 and the application examples of method.
In this application examples, as shown in Figure 2, sampling unit 1, filtrator 3, chromatograph 5 are connected successively with pump 8; T-valve 7 is arranged on the pipeline between chromatograph and pump, and pump uses ejector; Another entrance of T-valve is communicated with the pipeline between described filtrator and chromatograph; Second pressure gauge 4 is arranged on the pipeline between described filtrator and chromatograph.
In the course of work of on-Line Monitor Device, by the switching of T-valve and the work of pump, the flue gas in flue flows through sampling unit, filtrator and enter in chromatograph successively, finally flows through T-valve, pump;
By the switching of T-valve, make the flue gas in flue flow through sampling unit, filtrator, T-valve and pump successively, and without chromatograph, make the pressure equilibrium of chromatographic column upstream and downstream in described chromatograph;
Chromatograph, by analyzing the VOC in flue gas, knows its content.
Embodiment 3:
According to the on-Line Monitor Device of the embodiment of the present invention 1 and the application examples of method.
In this application examples, as shown in Figure 3, sampling unit 1, filtrator 3, chromatograph 5 are connected successively with pump 8; T-valve 7 is arranged on the pipeline between chromatograph and filtrator, and pump uses ejector; Pipeline described in another outlet of T-valve between pump and chromatograph; Second pressure gauge 4 is arranged on the pipeline between described T-valve and chromatograph.
In the course of work of on-Line Monitor Device, by the switching of T-valve and the work of pump, the flue gas in flue flows through sampling unit, filtrator, T-valve and enter in chromatograph successively, finally flows through pump;
By the switching of T-valve, make the flue gas in flue flow through sampling unit, filtrator, T-valve and pump successively, and without chromatograph, make the pressure equilibrium of chromatographic column upstream and downstream in described chromatograph;
Chromatograph, by analyzing the VOC in flue gas, knows its content.
Embodiment 4:
According to the on-Line Monitor Device of the embodiment of the present invention 1 and the application examples of method.
In this application examples, as shown in Figure 4, sampling unit 1, filtrator 3, chromatograph 5 are connected successively with pump; First valve 2 is arranged on the pipeline between filtrator 3 and chromatograph 5, and pump 9 uses vacuum pump; Pipeline between first valve and filtrator is communicated with the pipeline between chromatograph and pump by gas passage, and the second valve 6 is arranged on described gas passage; Second pressure gauge 4 is arranged on the pipeline between described filtrator and chromatograph.
In the course of work of on-Line Monitor Device, close the second valve, open the first valve, pump work, the flue gas in flue flows through sampling unit, filtrator, the first valve and enter in chromatograph successively, finally flows through pump;
Open the second valve, close the first valve, make the flue gas in flue flow through sampling unit, filtrator, the second valve and pump successively, and without chromatograph, make the pressure equilibrium of chromatographic column upstream and downstream in described chromatograph;
Chromatograph, by analyzing the VOC in flue gas, knows its content.
Claims (4)
1. a VOC on-Line Monitor Device in flue gas, is characterized in that: in described flue gas, VOC on-Line Monitor Device comprises:
Sampling unit, described sampling unit is for sampling flue gas to be measured;
Chromatograph, described chromatograph is arranged on the downstream of described sampling unit, and connects described sampling unit; Described chromatograph comprises chromatographic column, the first pressure gauge, and described first pressure gauge is arranged on the downstream of described chromatographic column;
Pump, described pump is arranged on described chromatographic downstream, and connects described chromatograph;
Switch unit, described switch unit is used for optionally making described sampling unit pass through or not be communicated with described pump by described chromatograph;
Second pressure gauge, described second pressure gauge is arranged between described sampling unit and chromatograph.
2. VOC on-Line Monitor Device in flue gas according to claim 1, is characterized in that: described switch unit is T-valve, is arranged between described chromatograph and pump or sampling unit.
3. VOC on-Line Monitor Device in flue gas according to claim 1, is characterized in that: described pump is ejector.
4. VOC on-line monitoring method in flue gas, in described flue gas, VOC on-line monitoring method comprises the following steps:
(A1) under the effect of pump, the flue gas in environment to be measured is sampled;
(A2) flue gas sampled is successively by chromatograph and described pump, and chromatograph completes sample introduction;
(A3) flue gas sampled does not enter described pump by described chromatograph, makes the pressure equilibrium of chromatographic column upstream and downstream in described chromatograph;
(A4) described chromatograph knows VOC content in flue gas by analyzing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511031174.5A CN105445066B (en) | 2015-12-31 | 2015-12-31 | VOC on-Line Monitor Device and method in flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511031174.5A CN105445066B (en) | 2015-12-31 | 2015-12-31 | VOC on-Line Monitor Device and method in flue gas |
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| Publication Number | Publication Date |
|---|---|
| CN105445066A true CN105445066A (en) | 2016-03-30 |
| CN105445066B CN105445066B (en) | 2019-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201511031174.5A Active CN105445066B (en) | 2015-12-31 | 2015-12-31 | VOC on-Line Monitor Device and method in flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671094A (en) * | 2021-08-11 | 2021-11-19 | 广西电网有限责任公司电力科学研究院 | Insulating material aging gas adsorption enrichment device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806679A (en) * | 2010-04-16 | 2010-08-18 | 宁夏电力公司电力科学研究院 | Flue gas sampling device |
| CN102288459A (en) * | 2011-07-13 | 2011-12-21 | 北京雪迪龙科技股份有限公司 | On-line analytical system for garbage incineration flue gas |
| CN203216909U (en) * | 2012-12-29 | 2013-09-25 | 聚光科技(杭州)股份有限公司 | Gas analysis system |
| CN203786134U (en) * | 2014-02-27 | 2014-08-20 | 奇鼎科技股份有限公司 | Sampling device of gas analyzer with high recovery rate |
| CN204758354U (en) * | 2015-04-23 | 2015-11-11 | 北京精诚石开仪器有限公司 | Volatile organic compounds's sampling system in waste gas |
| CN205483706U (en) * | 2015-12-31 | 2016-08-17 | 聚光科技(杭州)股份有限公司 | VOC on -line monitoring device in flue gas |
-
2015
- 2015-12-31 CN CN201511031174.5A patent/CN105445066B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806679A (en) * | 2010-04-16 | 2010-08-18 | 宁夏电力公司电力科学研究院 | Flue gas sampling device |
| CN102288459A (en) * | 2011-07-13 | 2011-12-21 | 北京雪迪龙科技股份有限公司 | On-line analytical system for garbage incineration flue gas |
| CN203216909U (en) * | 2012-12-29 | 2013-09-25 | 聚光科技(杭州)股份有限公司 | Gas analysis system |
| CN203786134U (en) * | 2014-02-27 | 2014-08-20 | 奇鼎科技股份有限公司 | Sampling device of gas analyzer with high recovery rate |
| CN204758354U (en) * | 2015-04-23 | 2015-11-11 | 北京精诚石开仪器有限公司 | Volatile organic compounds's sampling system in waste gas |
| CN205483706U (en) * | 2015-12-31 | 2016-08-17 | 聚光科技(杭州)股份有限公司 | VOC on -line monitoring device in flue gas |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671094A (en) * | 2021-08-11 | 2021-11-19 | 广西电网有限责任公司电力科学研究院 | Insulating material aging gas adsorption enrichment device |
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| CN105445066B (en) | 2019-06-14 |
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