CN112505205A - High-concentration sample gas online analysis system and high-concentration sample gas online analysis method - Google Patents
High-concentration sample gas online analysis system and high-concentration sample gas online analysis method Download PDFInfo
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- CN112505205A CN112505205A CN202011502876.8A CN202011502876A CN112505205A CN 112505205 A CN112505205 A CN 112505205A CN 202011502876 A CN202011502876 A CN 202011502876A CN 112505205 A CN112505205 A CN 112505205A
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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
- G01N30/06—Preparation
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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
- G01N30/18—Injection using a septum or microsyringe
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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
- G01N30/20—Injection using a sampling valve
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Abstract
The invention discloses a high-concentration sample gas online analysis system and a high-concentration sample gas online analysis method, belongs to the technical field of gas detection, and is designed for solving the problems of high use cost and the like of the existing analysis system. The high-concentration sample gas online analysis system comprises a sample gas inlet, a standard gas inlet and an air pump, wherein a first pipeline and a second pipeline are communicated between the sample gas inlet and the air pump, the first pipeline and the second pipeline are communicated at a connection point A, and the standard gas inlet is communicated to the connection point A through a third pipeline; a sample gas valve is arranged on the first pipeline, a jet pump, an analysis assembly and an exhaust valve are arranged on the second pipeline, and a standard gas valve is arranged on the third pipeline; the jet pump is connected to the dilution gas inlet. The high-concentration sample gas on-line analysis system and the high-concentration sample gas on-line analysis method can dilute the high-concentration sample gas or standard gas passing through the jet pump, realize the real-time on-line monitoring of the high-concentration sample gas and have low product cost.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a high-concentration sample gas online analysis system and a high-concentration sample gas online analysis method based on the analysis system.
Background
In the production process of chemical enterprises and before waste gas is introduced into an incinerator, concentration monitoring is needed to be carried out on the gas so as to improve the product performance and avoid production accidents caused by the fact that the concentration of the waste gas exceeds the explosion limit.
At present, chemical enterprises generally use an online gas chromatograph to detect concentration. However, the online gas chromatograph has an upper detection limit, and the concentrations of the sample gas and the waste gas in the production process of the chemical enterprises basically exceed the upper detection limit of the online gas chromatograph, so that the online gas chromatograph is difficult to detect the high-concentration gas such as the sample gas in the process, the waste gas before treatment and the like. A dilution gas distribution instrument is added in the existing part of on-line gas chromatographs, so that the purchase cost and the maintenance cost are increased, and the method does not conform to the road guidelines of green, low-carbon and sustainable development.
Disclosure of Invention
The invention aims to provide a high-concentration sample gas online analysis system which is low in cost and convenient to use.
Another objective of the present invention is to provide an on-line analysis method for high concentration sample gas with simple process and low cost.
To achieve the purpose, on one hand, the invention adopts the following technical scheme:
a high-concentration sample gas online analysis system comprises a sample gas inlet for introducing sample gas to be analyzed, a standard gas inlet for introducing standard gas and an air pump for driving gas in a pipeline to flow, wherein a first pipeline and a second pipeline are communicated between the sample gas inlet and the air pump, the first pipeline and the second pipeline are communicated at a connection point A, and the standard gas inlet is communicated to the connection point A through a third pipeline; a sample gas valve is arranged on the first pipeline, a jet pump, an analysis assembly and an air extraction valve are sequentially arranged on the second pipeline from the connection point A to the air extraction pump, and a standard gas valve is arranged on the third pipeline; the jet pump is connected to the dilution gas inlet.
In particular, the analysis assembly includes a restrictive orifice disposed on the second conduit and a gas chromatography system spanning both ends of the restrictive orifice, the gas chromatography system including a valving system, a chromatography column, and a detector.
In particular, the detector is a hydrogen flame ionization detector.
Particularly, on the first pipeline and be located the sample gas entry with be provided with tie point B between the sample gas valve, tie point B is connected to the purge gas entry through the pipeline tie point B with be provided with the purge gas valve on the pipeline between the purge gas entry.
Particularly, a connection point C is arranged on the third pipeline and between the standard gas inlet and the standard gas valve, the connection point C is connected to a first pair of air ports through a pipeline, and a ball valve is arranged on the pipeline between the connection point C and the first pair of air ports; and a connection point D is arranged on the second pipeline and between the jet pump and the analysis assembly, and the connection point D is connected to a second air interface through a pipeline.
In particular, a flowmeter is arranged on the third pipeline between the standard gas inlet and the connection point C, and the flowmeter is a rotor flowmeter.
Particularly, the sample gas valve is a two-position two-way electromagnetic valve, and the extraction valve and the standard gas valve are two-position three-way electromagnetic valves.
In particular, the first, second and third conduits are all made of stainless steel.
On the other hand, the invention adopts the following technical scheme:
based on the high-concentration sample gas online analysis system, when a jet pump is used for preliminary sampling of sample gas or standard gas, a dilution gas inlet injects gas into the jet pump to dilute the sample gas or the standard gas in the jet pump, and an air pump sends the diluted sample gas or the standard gas into an analysis assembly for analysis or calibration.
In particular, the high-concentration sample gas online analysis method comprises the following steps:
step S1, closing the sample gas valve, starting the air suction pump, the air suction valve and the standard gas valve, and enabling the standard gas to enter the analysis assembly for calibration after being diluted in the jet pump;
and step S2, closing the standard gas valve, starting the air suction pump, the air suction valve and the sample gas valve, and enabling the sample gas to enter the analysis assembly for analysis after being diluted in the jet pump.
The high-concentration sample gas online analysis system comprises the jet pump, wherein the jet pump is connected to the inlet of the dilution gas, and can dilute the high-concentration sample gas or the standard gas passing through the jet pump until the gas concentration value is reduced to the detection range of the gas chromatograph, so that the high-concentration sample gas online analysis system realizes the real-time online monitoring of the high-concentration sample gas, enlarges the detection upper limit of the chromatographic analysis system, and has the advantages of reasonable structure, convenient use, low product cost and high cost performance.
The high-concentration sample gas online analysis method disclosed by the invention is used for preliminarily sampling the sample gas or the standard gas by using the jet pump and simultaneously diluting the sample gas or the standard gas, so that the high-concentration sample gas is diluted and tested in the same analysis system by using a single analysis instrument, the operation is simple, the manufacturing cost and the use cost are saved, and the high-concentration sample gas can be accurately monitored online in real time.
Drawings
FIG. 1 is a schematic structural diagram of an analysis system in a calibration state according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an analysis system in a sampling analysis state according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an analysis system in a blowback state according to an embodiment of the present invention.
In the figure:
1. a sample gas inlet; 2. a standard gas inlet; 3. an air pump; 6. an injection pump; 7. an analysis component; 8. a diluent gas inlet; 9. a purge gas inlet; 10. a ball valve; 11. a first pair of air interfaces; 12. a second pair of air interfaces; 13. a flow meter; 41. a first conduit; 42. a second conduit; 43. a third pipeline; 51. a sample gas valve; 52. an air extraction valve; 53. a marking air valve; 54. a purge valve; 71. a restriction orifice plate; 72. a gas chromatography system.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The embodiment discloses a high-concentration sample gas online analysis system and a high-concentration sample gas online analysis method based on the analysis system. As shown in fig. 1 to 3, the analysis system includes a sample gas inlet 1 for introducing a sample gas to be analyzed, a standard gas inlet 2 for introducing a standard gas, and a suction pump 3 for driving gas in the pipeline to flow, a first pipeline 41 and a second pipeline 42 are communicated between the sample gas inlet 1 and the suction pump 3, the first pipeline 41 and the second pipeline 42 are communicated at a connection point a, and the standard gas inlet 2 is communicated to the connection point a through a third pipeline 43; a sample valve 51 is arranged on the first pipeline 41, an injection pump 6, an analysis module 7 and an air suction valve 52 are sequentially arranged on the second pipeline 42 from the connection point A to the air suction pump 3, and a standard air valve 53 is arranged on the third pipeline 43; the ejector pump 6 is connected to the dilution gas inlet 8.
According to the high-concentration sample gas online analysis method based on the analysis system, when the jet pump 6 is used for carrying out preliminary sampling on the sample gas or the standard gas, the dilution gas inlet 8 injects gas into the jet pump 6 so as to dilute the sample gas or the standard gas in the jet pump 6, and the air pump 3 sends the diluted sample gas or the standard gas into the analysis component 7 for analysis or calibration. The change in dilution factor can be achieved by adjusting the flow rate of the dilution gas entering the jet pump 6, taking into account the difference in concentration of the sample gas or the standard gas in the jet pump 6, and correspondingly the difference in the required dilution factor.
The analysis system comprises an injection pump 6 connected with a dilution gas inlet 8, and can dilute high-concentration sample gas or standard gas (gas exceeding the detection upper limit of a conventional gas chromatograph is the high-concentration gas in the embodiment) passing through the injection pump 6 until the gas concentration value is reduced to the detection range of the gas chromatograph, so that the real-time online monitoring of the high-concentration sample gas is realized, and the detection upper limit of a chromatographic analysis system is enlarged; the analysis system is reasonable in structure and convenient to use.
The flow of the high-concentration sample gas on-line analysis method is simple and clear, the high-concentration sample gas can be diluted and analyzed without a dilution gas distribution instrument, the high-concentration sample gas is diluted and tested in the same analysis system by using a single analysis instrument, the operation is simple, the manufacturing cost and the use cost are saved, and the high-concentration sample gas can be accurately monitored on line in real time.
The gas injected into the jet pump 6 from the dilution gas inlet 8 is preferably dehumidified and hydrocarbon-removed air or high-purity nitrogen, and has good gas stability and does not react with the high-concentration sample gas or standard gas. In addition, the dehumidified and dehumidified hydrocarbon air or the high-purity nitrogen gas can dilute the high-concentration sample gas and the standard gas, and can purge the jet pump 6, so that the jet pump 6 is continuously in a stable working state.
On the basis of the above structure, the analysis assembly 7 includes a restriction orifice 71 provided on the second pipe 42 and a gas chromatography system 72 connected across both ends of the restriction orifice 71, the gas chromatography system 72 including a valving system, a chromatography column and a detector. Preferably, the detector is a hydrogen flame ionization detector, so that the detection precision is higher and the application range is wider. The restriction orifice 71 can reduce the flow rate of the sample gas or the standard gas flowing through it, so that the gas chromatography system 72 can stably sample and analyze the sample gas.
A connection point B is provided on the first pipe 41 between the sample gas inlet 1 and the sample gas valve 51, the connection point B is connected to the purge gas inlet 9 through a pipe, and a purge gas valve 54 is provided on the pipe between the connection point B and the purge gas inlet 9. The purge gas inlet 9 may feed a purge gas, preferably dehumidified hydrocarbon-depleted air or high purity nitrogen, into the first conduit 41.
A connection point C is arranged on the third pipeline 43 and between the standard gas inlet 2 and the standard gas valve 53, the connection point C is connected to the first pair of empty ports 11 through a pipeline, and a ball valve 10 is arranged on the pipeline between the connection point C and the first pair of empty ports 11; a connection point D is provided on the second pipe 42 between the jet pump 6 and the analysis assembly 7, which connection point D is connected to the second emptying port 12 by a pipe. Wherein, the ball valve 10 is a two-way ball valve, the control accuracy is high, and the product cost is low. The first pair of air ports 11 is selected to be in an open state or a closed state as required, and the second pair of air ports 12 is always in the open state, so that sample gas or standard gas entering the analysis system is ensured to be injected in a negative pressure extraction mode, and the gas circulation is smoother.
A flow meter 13 is provided on the third pipe 43 between the standard gas inlet 2 and the connection point C to meter the standard gas flowing through the third pipe 43. Preferably, the flowmeter 13 is a rotor flowmeter, so that the measurement precision is higher, and the product cost performance is high.
On the basis of the structure, the sample gas valve 51 and the purge gas valve 54 are both two-position two-way electromagnetic valves, and the extraction valve 52 and the standard gas valve 53 are both two-position three-way electromagnetic valves, so that the control method is simpler, the control precision is high, and the product cost is low.
The high-concentration sample gas online analysis method comprises the following steps:
as shown in fig. 1, in step S1, the sample gas valve 51 and the purge gas valve 54 are closed, the extraction valve 52, the standard gas valve 53, the flow meter 13 and the ball valve 10 are opened, the extraction pump 3 is started, at this time, the sample gas and the purge gas cannot enter the analysis system, the standard gas sequentially passes through the flow meter 13 and the standard gas valve 53 and then enters the injection pump 6, the standard gas is diluted in the injection pump 6, and the extraction pump 3 extracts the diluted standard gas to enter the analysis module 7 for calibration. The curve with arrows in fig. 1 indicates the flow direction of the calibration gas, and the analysis method is in the calibration state stage.
As shown in fig. 2, in step S2, the standard gas valve 53, the purge gas valve 54, and the flow meter 13 are closed, the suction valve 52, the sample gas valve 51, and the ball valve 10 are opened, the suction pump 3 is started, at this time, the standard gas and the purge gas cannot enter the analysis system, the sample gas enters the jet pump 6 through the sample gas valve 51, the sample gas is diluted in the jet pump 6, and the diluted sample gas is pumped into the analysis module 7 by the suction pump 3 for analysis. The curve with arrows in fig. 2 shows the flow direction of the sample gas, and the analysis method is in the sampling analysis state.
As shown in fig. 3, in step S3, closing the sample gas valve 51, the suction valve 52, the flow meter 13 and the suction pump 3, and opening the standard gas valve 53, the purge gas valve 54 and the ball valve 10, at which time, neither the standard gas nor the sample gas can enter the analysis system, and the purge gas ejected from the purge gas inlet 9 passes through the purge gas valve 54 and then is blown into the sample gas inlet 1 in the reverse direction, so as to clean the sample gas inlet 1 and the first pipeline 41; the jet pump 6 draws air in from the first pair of air ports 11 and discharges air from the second pair of air ports 12, so that the air pressure in the analysis system is kept relatively stable. The curve with arrows in fig. 3 indicates the flow direction of the purge gas, and the analysis method is in the stage of the back-flushing state.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The high-concentration sample gas online analysis system is characterized by comprising a sample gas inlet (1) for introducing sample gas to be analyzed, a standard gas inlet (2) for introducing standard gas and a suction pump (3) for driving gas in a pipeline to flow, wherein a first pipeline (41) and a second pipeline (42) are communicated between the sample gas inlet (1) and the suction pump (3), the first pipeline (41) is communicated with the second pipeline (42) at a connection point A, and the standard gas inlet (2) is communicated to the connection point A through a third pipeline (43); a sample gas valve (51) is arranged on the first pipeline (41), a jet pump (6), an analysis component (7) and an air suction valve (52) are sequentially arranged on the second pipeline (42) from the connecting point A to the air suction pump (3), and a standard gas valve (53) is arranged on the third pipeline (43); the ejector pump (6) is connected to a dilution gas inlet (8).
2. The on-line analysis system for high concentration sample gas as recited in claim 1, wherein the analysis assembly (7) comprises a restrictive orifice plate (71) disposed on the second conduit (42) and a gas chromatography system (72) connected across the restrictive orifice plate (71), the gas chromatography system (72) comprising a valving system, a chromatography column and a detector.
3. The high-concentration sample gas online analysis system of claim 2, wherein the detector is a hydrogen flame ionization detector.
4. The online analysis system for high-concentration sample gas according to claim 1, wherein a connection point B is provided on the first pipe (41) between the sample gas inlet (1) and the sample gas valve (51), the connection point B is connected to a purge gas inlet (9) through a pipeline, and a purge gas valve (54) is provided on a pipeline between the connection point B and the purge gas inlet (9).
5. The online analysis system for the high-concentration sample gas as recited in any one of claims 1 to 4, wherein a connection point C is arranged on the third pipeline (43) and between the standard gas inlet (2) and the standard gas valve (53), the connection point C is connected to the first pair of empty ports (11) through a pipeline, and a ball valve (10) is arranged on the pipeline between the connection point C and the first pair of empty ports (11); a connection point D is arranged on the second line (42) between the jet pump (6) and the analysis assembly (7), said connection point D being connected to the second pair of apertures (12) by a line.
6. The online analysis system for high-concentration sample gas according to claim 5, characterized in that a flow meter (13) is arranged on the third pipeline (43) between the standard gas inlet (2) and the connection point C, and the flow meter (13) is a rotor flow meter.
7. The online analysis system for high-concentration sample gas as recited in any one of claims 1 to 4, wherein the sample gas valve (51) is a two-position two-way solenoid valve, and the extraction valve (52) and the standard gas valve (53) are both two-position three-way solenoid valves.
8. The high concentration sample gas online analysis system according to any one of claims 1 to 4, wherein the first pipe (41), the second pipe (42), and the third pipe (43) are each made of stainless steel.
9. An online analysis method for high concentration sample gas based on the online analysis system for high concentration sample gas according to any one of claims 1 to 8, wherein when the sample gas or the standard gas is preliminarily sampled by using the jet pump (6), the dilution gas inlet (8) injects gas into the jet pump (6) to dilute the sample gas or the standard gas in the jet pump (6), and the air pump (3) feeds the diluted sample gas or the standard gas into the analysis component (7) for analysis or calibration.
10. The method for the on-line analysis of a high-concentration sample gas according to claim 9, comprising the steps of:
step S1, closing a sample gas valve (51), starting an air suction pump (3), an air suction valve (52) and a standard gas valve (53), wherein the standard gas enters the analysis component (7) for calibration after being diluted in the jet pump (6);
and step S2, closing the standard gas valve (53), starting the air suction pump (3), the air suction valve (52) and the sample gas valve (51), and enabling the sample gas to enter the analysis assembly (7) for analysis after being diluted in the jet pump (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011502876.8A CN112505205A (en) | 2020-12-18 | 2020-12-18 | High-concentration sample gas online analysis system and high-concentration sample gas online analysis method |
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| CN202011502876.8A CN112505205A (en) | 2020-12-18 | 2020-12-18 | High-concentration sample gas online analysis system and high-concentration sample gas online analysis method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252864A (en) * | 2021-06-03 | 2021-08-13 | 四川铭鉴知源科技有限公司 | Chromatogram preliminary treatment gas circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252864A (en) * | 2021-06-03 | 2021-08-13 | 四川铭鉴知源科技有限公司 | Chromatogram preliminary treatment gas circuit |
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