CN209979564U - Gas chromatographic analyzer - Google Patents
Gas chromatographic analyzer Download PDFInfo
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- CN209979564U CN209979564U CN201920485720.XU CN201920485720U CN209979564U CN 209979564 U CN209979564 U CN 209979564U CN 201920485720 U CN201920485720 U CN 201920485720U CN 209979564 U CN209979564 U CN 209979564U
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Abstract
The utility model belongs to the technical field of volatile organic compounds detects, especially, relate to a gas chromatographic analyzer, including chromatographic column, eight logical valve, detector, appearance gas input, carrier gas input, gas input and combustion-supporting gas input, the carrier gas input connects gradually eight logical valve, chromatographic column and detector, eight logical valve passes through the second ration ring and is connected with the appearance gas input, be equipped with forward gas blowing channel and reverse gas blowing channel on the eight logical valve, work as when the eight logical valve is in the first state, the carrier gas input is connected with the chromatographic column through reverse gas blowing channel, works as when the eight logical valve is in the second state, the carrier gas input is connected with the chromatographic column through forward gas blowing channel, second ration ring, gas input and combustion-supporting gas input are connected with the detector respectively. Has the advantages that: the utility model discloses a gas chromatographic analyzer directly obtains the total hydrocarbon of non-methane through the blowback chromatographic column, and the accuracy that the total hydrocarbon of non-methane detected is guaranteed to the reduce system error.
Description
Technical Field
The utility model belongs to the technical field of volatile organic compounds detects, especially, relate to a gas chromatography appearance.
Background
The gas chromatographic analyzer is based on the system formed by different substances in stationary phase and mobile phase, i.e. the chromatographic column has different distribution coefficients to separate the components of the sample gas to be measured, then the chromatographic peak of each component gas is converted into electric signal by a detector, and the electric signal is converted into voltage or current by an electronic amplifier to be output. As shown in fig. 1, the conventional gas chromatography analyzer for detecting volatile organic compounds includes a methane chromatography column 100, a total hydrocarbon chromatography column 200, a pretreatment chromatography column 300, a ten-way valve V1, a six-way valve V2, and a FID detector 400, where the ten-way valve V1 and the six-way valve V2 are respectively connected to a sample gas input end 11 through a first quantitative ring 500, the ten-way valve V1 and the six-way valve V2 are respectively provided with a first blowback channel, the first blowback channel is connected to a carrier gas input end, and the first blowback channels of the ten-way valve V1 and the six-way valve V2 are respectively connected to the FID detector 400 through the methane chromatography column 100 and the total hydrocarbon chromatography column 200; and a second blowback channel is arranged on the ten-way valve V1, the pretreatment chromatographic column 300 is connected with the second blowback channel of the ten-way valve V1, and the second blowback channel is connected with the carrier gas input end 12. The gas chromatographic analyzer detects non-methane total hydrocarbons through two analysis flow paths, wherein one path of total hydrocarbons enters the FID detector 400 through the six-way valve V2 for detection, the other path of total hydrocarbons enters the FID detector 400 through the ten-way valve V1 for sample gas, then methane is separated in the methane chromatographic column 100 and enters the FID detector 400 for detection, and then the value of the non-methane total hydrocarbons is obtained by calculating the difference value of the two paths of total hydrocarbons and the methane, so that the gas chromatographic non-methane total hydrocarbon spectrogram shown in figure 2 is formed. For example, patent No. 201811454020.0 discloses an online Volatile Organic Compounds (VOCs) monitoring system, which utilizes the detection principle of VOCs.
The existing gas chromatographic analyzer has the following defects: 1) the number of components is large, the structure is complex, the separation process is complex, and the cost of the analyzer is high; 2) the existing gas chromatographic analyzer calculates the content of non-methane total hydrocarbons by obtaining the content of total hydrocarbons and methane, has large system error and cannot ensure the accuracy of non-methane total hydrocarbon detection.
SUMMERY OF THE UTILITY MODEL
For the problem that the gas chromatography appearance structure that solves prior art existence is complicated, the separation flow is complicated and can't directly obtain non-methane total hydrocarbon content, the utility model provides a gas chromatography appearance.
For solving above-mentioned technical problem, the utility model discloses the technical scheme who adopts as follows, a gas chromatographic analyzer, including chromatographic column, eight logical valve, detector, appearance gas input end, carrier gas input end, gas input end and combustion-supporting gas input end, the carrier gas input end connects gradually eight logical valve, chromatographic column and detector, eight logical valve passes through the second ration ring and is connected with the appearance gas input end, be equipped with forward gas blowing channel and reverse gas blowing channel on the eight logical valve, work as when the eight logical valve is in the first state, the carrier gas input end is connected with the chromatographic column through reverse gas blowing channel, works as when the eight logical valve is in the second state, the carrier gas input end is connected with the chromatographic column through forward gas blowing channel, second ration ring, gas input end and combustion-supporting gas input end are connected with the detector respectively.
Preferably, the eight-way valve has eight passage ports;
when the eight-way valve is in a first state, the gas chromatographic analyzer is in a sampling and reverse sampling working state, and under the sampling and reverse sampling working state: the carrier gas enters the eighth channel port through the carrier gas input end, and then sequentially passes through the seventh channel port, the chromatographic column, the fifth channel port and the sixth channel port, and finally reaches the detector; the sample gas enters the second channel port through the sample gas input end, then sequentially passes through the first channel port, the second quantitative ring, the fourth channel port and the third channel port, and finally reaches the sample gas emptying port;
when the eight-way valve is in the second state, the gas chromatographic analyzer is in a forward sample injection working state, and in the forward sample injection working state: the carrier gas enters the eighth channel port through the carrier gas input end, and then sequentially passes through the first channel port, the second quantitative ring, the fourth channel port, the fifth channel port, the chromatographic column, the seventh channel port and the sixth channel port, and finally reaches the detector; and the sample gas enters the second channel port through the sample gas input end and then flows to the sample gas emptying port through the third channel port. The positive direction blowing channel and the reverse direction blowing channel of the eight-way valve are utilized, and the methane in the sample gas flows fast in the chromatographic column, the methane firstly flows out of the chromatographic column, the non-methane total hydrocarbon is sealed in the chromatographic column, so that the purpose that the carrier gas positively bears the methane in the chromatographic column through the chromatographic column to enter the detector is realized, the carrier gas reversely bears the non-methane total hydrocarbon in the chromatographic column through the chromatographic column to enter the detector, the non-methane total hydrocarbon is directly obtained through the back blowing chromatographic column, the system error is greatly reduced, and the accuracy of the detection of the non-methane total hydrocarbon is ensured.
Preferably, the detector is a hydrogen flame ionization detector.
Furthermore, hydrogen is input into the fuel gas input end, air is input into the combustion-supporting gas input end, and nitrogen is input into the carrier gas input end.
Furthermore, the chromatographic column adopts a Porapak R packed column.
Has the advantages that: the utility model discloses a gas chromatographic analyzer has simplified whole gas chromatographic separation flow, reduces to include parts such as six-way valve, total hydrocarbon chromatographic column, and this analyzer cost further reduces; present gas chromatographic analyzer is through the content that obtains total hydrocarbon and methane to remove the content of calculating total hydrocarbon of non-methane, and the utility model discloses a gas chromatographic analyzer directly obtains total hydrocarbon of non-methane through the blowback chromatographic column, and the accuracy that can greatly reduced system error like this guarantees the total hydrocarbon of non-methane and detects.
Drawings
FIG. 1 is a schematic diagram of a background art gas chromatograph;
FIG. 2 is a background art gas chromatography non-methane total hydrocarbon spectrum;
FIG. 3 is a schematic diagram of the working state of the gas chromatograph of the present invention;
FIG. 4 is a schematic diagram of the forward sampling operation state of the gas chromatograph of the present invention;
fig. 5 is a gas chromatography non-methane total hydrocarbon spectrum of the present invention;
in the figure: background art: 100. a methane chromatographic column, 200, a total hydrocarbon chromatographic column, 300, a pretreatment chromatographic column, V1, a ten-way valve, V2, a six-way valve, 400, a FID detector, 500 and a first quantitative ring; the utility model discloses: 1. the device comprises a first channel port, a second channel port, a third channel port, a fourth channel port, a fifth channel port, a sixth channel port, a seventh channel port, a eighth channel port, a chromatographic column, a V3, an eight-way valve, a detector, a sample gas input end, a carrier gas input end, a combustion-supporting gas input end, a sample gas emptying port, a second quantitative ring, and a third channel port, wherein the first channel port is 2, the second channel port, 3, the third channel port, 4, the fourth channel port, 5, the.
Detailed Description
Examples
As shown in fig. 3 and 4, a gas chromatograph includes a chromatographic column 9, an eight-way valve V3, a detector 10, a sample gas input end 11, a carrier gas input end 12, a gas input end 13, and a combustion-supporting gas input end 14, wherein the chromatographic column 9 is a Porapak R packed column produced by beijing minnik analyzer center, the column length is 0.8m, and the inner diameter is 1/8 inches, the carrier gas input end 12 is connected with the eight-way valve V3, the chromatographic column 9, and the detector 10 in sequence, the eight-way valve V3 is connected with the sample gas input end 11 through a second quantitative ring 16, the eight-way valve V3 is provided with a forward blowing channel and a reverse blowing channel, when the eight-way valve V3 is in a first state, the carrier gas input end 12 is connected with the chromatographic column 9 through the reverse blowing channel, and when the eight-way valve V3 is in a second state, the carrier gas input end 12 is connected with the sample gas input end, The second quantitative ring 16 is connected with the chromatographic column 9, and the gas input end 13 and the combustion-supporting gas input end 14 are respectively connected with the detector 10; the detector 10 adopts a hydrogen flame ionization detector, hydrogen is input from the fuel gas input end 13, air is input from the combustion-supporting gas input end 14, nitrogen is input from the carrier gas input end 12, and the sample gas input from the sample gas input end 11 is volatile organic compounds.
The eight-way valve V3 of the present embodiment has eight passage ports; when the eight-way valve V3 is in a first state, the gas chromatograph is in a sampling and reverse sample feeding working state, and in the sampling and reverse sample feeding working state: the carrier gas enters the eighth channel port 8 through the carrier gas input end 12, and then sequentially passes through the seventh channel port 7, the chromatographic column 9, the fifth channel port 5 and the sixth channel port 6, and finally reaches the detector 10; the sample gas enters the second channel port 2 through the sample gas input end 11, then sequentially passes through the first channel port 1, the second quantitative ring 16, the fourth channel port 4 and the third channel port 3, and finally reaches the sample gas emptying port 15; when the eight-way valve V3 is in the second state, the gas chromatographic analyzer is in the forward sample injection working state, and in the forward sample injection working state: the carrier gas enters the eighth channel port 8 through the carrier gas input end 12, and then sequentially passes through the first channel port 1, the second quantitative ring 16, the fourth channel port 4, the fifth channel port 5, the chromatographic column 9, the seventh channel port 7 and the sixth channel port 6, and finally reaches the detector 10; the sample gas enters the second channel port 2 through the sample gas input end 11 and then passes through the third channel port 3 to the sample gas emptying port 15; because the methane in the sample gas flows fast in the chromatographic column 9, the methane firstly flows out of the chromatographic column 9, the carrier gas positively sweeps the chromatographic column 9 to bear the methane and enters the detector 10, the non-methane total hydrocarbon is sealed in the chromatographic column 9, and the carrier gas reversely sweeps the chromatographic column 9 to bear the non-methane total hydrocarbon and enters the detector 10; the gas chromatograph of this example detected the sample gas and developed a gas chromatograph non-methane total hydrocarbon spectrum as shown in fig. 5.
The working principle is as follows:
as shown in fig. 3, the first step is a sampling and back-purging operation of the gas chromatograph, in which the eight-way valve V3 is not rotated, the internal connection relationship is the initial state, and the eight-way valve V3 is in the first state:
carrier gas enters the eighth channel port 8 through the carrier gas input end 12, then sequentially passes through the seventh channel port 7, the chromatographic column 9, the fifth channel port 5 and the sixth channel port 6, and finally reaches the detector 10, wherein the carrier gas is high-purity nitrogen which is used as a scavenging gas source, the chromatographic column 9 is subjected to back flushing scavenging work, the gas components remained during the last analysis are completely purged, and the stability and the accuracy of the next analysis data are ensured;
meanwhile, the sample gas enters the second channel port 2 through the sample gas input end 11, then sequentially passes through the first channel port 1, the second quantitative ring 16, the fourth channel port 4 and the third channel port 3, and finally reaches the sample gas emptying port 15; wherein the sample gas flows through the second dosing ring 16 in real time, thereby filling the second dosing ring 16 with sample gas in preparation for analysis;
as shown in fig. 4, the second step is a forward sampling working state of the gas chromatograph, at this time, the driving gas source drives the eight-way valve V3 to rotate, so as to change the internal connection relationship, and when the eight-way valve V3 is in the second state:
the sample gas enters the second channel port 2 through the sample gas input end 11 and then passes through the third channel port 3 to the sample gas emptying port 15;
meanwhile, the carrier gas enters the eighth channel port 8 through the carrier gas input end 12, and then sequentially passes through the first channel port 1, the second quantitative ring 16, the fourth channel port 4, the fifth channel port 5, the chromatographic column 9, the seventh channel port 7 and the sixth channel port 6, and finally reaches the detector 10; because the methane in the sample gas flows fast in the chromatographic column 9, the methane firstly flows out of the chromatographic column 9, the carrier gas positively sweeps the chromatographic column 9 to bear the methane and enters the detector 10, the non-methane total hydrocarbon is sealed in the chromatographic column 9, meanwhile, the hydrogen enters the detector 10 through the hydrogen input end, the air enters the detector 10 through the air input end, the flame generated by combustion of the hydrogen and the air in the detector 10 is used as an energy source, when the pure methane enters the flame generated by combustion of the hydrogen and the air, chemical ionization is generated at high temperature, and the detector 10 analyzes the methane;
as shown in fig. 3, the third step is a sampling and reverse sample injection working state of the gas chromatograph, at this time, the driving gas source drives the eight-way valve V3 to rotate, the internal connection relationship is changed, and when the eight-way valve V3 returns to the first state:
carrier gas enters an eighth channel port 8 through a carrier gas input end 12, then sequentially passes through a seventh channel port 7, a chromatographic column 9, a fifth channel port 5 and a sixth channel port 6, and finally reaches a detector 10, wherein the carrier gas reversely sweeps the non-methane total hydrocarbon carried by the chromatographic column 9 and sealed in the chromatographic column 9 to enter the detector 10, meanwhile, hydrogen enters the detector 10 through a hydrogen input end, air enters the detector 10 through an air input end, flame generated by combustion of the hydrogen and the air in the detector 10 is used as energy, when the non-methane total hydrocarbon enters the flame generated by combustion of the hydrogen and the air, chemical ionization is generated at high temperature, and the detector 10 analyzes the non-methane total hydrocarbon; the reverse purging time of the chromatographic column 9 can be prolonged, the residual gas components in the last analysis can be completely purged, and the stability and accuracy of the next analysis data can be ensured;
meanwhile, the sample gas enters the second channel port 2 through the sample gas input end 11, then sequentially passes through the first channel port 1, the second quantitative ring 16, the fourth channel port 4 and the third channel port 3, and finally reaches the sample gas emptying port 15; wherein the sample gas flows through the second dosing ring 16 in real time, thereby allowing the second dosing ring 16 to be filled with sample gas in preparation for the next analysis.
Claims (5)
1. A gas chromatograph, characterized by: comprises a chromatographic column (9), an eight-way valve (V3), a detector (10), a sample gas input end (11), a carrier gas input end (12), a fuel gas input end (13) and a combustion-supporting gas input end (14), the carrier gas input end (12) is sequentially connected with an eight-way valve (V3), a chromatographic column (9) and a detector (10), the eight-way valve (V3) is connected with the sample gas input end (11) through a second quantitative ring (16), a forward blowing channel and a reverse blowing channel are arranged on the eight-way valve (V3), when the eight-way valve (V3) is in the first state, the carrier gas input end (12) is connected with the chromatographic column (9) through a reverse blowing channel, when the eight-way valve (V3) is in the second state, the carrier gas input end (12) is connected with the chromatographic column (9) through the forward blowing channel and the second quantitative ring (16), the gas input end (13) and the combustion-supporting gas input end (14) are respectively connected with the detector (10).
2. The gas chromatograph of claim 1, wherein: the eight-way valve (V3) has eight passage ports;
when the eight-way valve (V3) is in a first state, the gas chromatograph is in a sampling and reverse sample injection working state, and in the sampling and reverse sample injection working state: the carrier gas enters the eighth channel port (8) through the carrier gas input end (12), and then sequentially passes through the seventh channel port (7), the chromatographic column (9), the fifth channel port (5) and the sixth channel port (6) and finally reaches the detector (10); sample gas enters a second channel opening (2) through a sample gas input end (11), sequentially passes through a first channel opening (1), a second quantitative ring (16), a fourth channel opening (4) and a third channel opening (3) and finally reaches a sample gas emptying port (15);
when the eight-way valve (V3) is in a second state, the gas chromatographic analyzer is in a forward sample injection working state, and in the forward sample injection working state: the carrier gas enters an eighth channel port (8) through a carrier gas input end (12), sequentially passes through a first channel port (1), a second quantitative ring (16), a fourth channel port (4), a fifth channel port (5), a chromatographic column (9), a seventh channel port (7) and a sixth channel port (6) and finally reaches a detector (10); the sample gas enters the second channel opening (2) through the sample gas input end (11) and then reaches the sample gas emptying port (15) through the third channel opening (3).
3. The gas chromatograph of claim 1 or 2, wherein: the detector (10) is a hydrogen flame ionization detector.
4. The gas chromatograph of claim 3, wherein: hydrogen is input into the fuel gas input end (13), air is input into the combustion-supporting gas input end (14), and nitrogen is input into the carrier gas input end (12).
5. The gas chromatograph of claim 1 or 2, wherein: and the chromatographic column (9) is a Porapak R packed column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920485720.XU CN209979564U (en) | 2019-04-11 | 2019-04-11 | Gas chromatographic analyzer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920485720.XU CN209979564U (en) | 2019-04-11 | 2019-04-11 | Gas chromatographic analyzer |
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| CN209979564U true CN209979564U (en) | 2020-01-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505186A (en) * | 2020-05-11 | 2020-08-07 | 合肥水泥研究设计院有限公司 | Multichannel sample introduction gas chromatograph |
| CN113155988A (en) * | 2020-12-31 | 2021-07-23 | 杭州谱育科技发展有限公司 | Non-methane total hydrocarbon detection system and method based on single valve |
-
2019
- 2019-04-11 CN CN201920485720.XU patent/CN209979564U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505186A (en) * | 2020-05-11 | 2020-08-07 | 合肥水泥研究设计院有限公司 | Multichannel sample introduction gas chromatograph |
| CN113155988A (en) * | 2020-12-31 | 2021-07-23 | 杭州谱育科技发展有限公司 | Non-methane total hydrocarbon detection system and method based on single valve |
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Granted publication date: 20200121 |