CN111505186A - Multichannel sample introduction gas chromatograph - Google Patents
Multichannel sample introduction gas chromatograph Download PDFInfo
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- CN111505186A CN111505186A CN202010393212.6A CN202010393212A CN111505186A CN 111505186 A CN111505186 A CN 111505186A CN 202010393212 A CN202010393212 A CN 202010393212A CN 111505186 A CN111505186 A CN 111505186A
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- 238000005070 sampling Methods 0.000 claims abstract description 70
- 239000007789 gas Substances 0.000 claims abstract description 62
- 239000012159 carrier gas Substances 0.000 claims abstract description 55
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000012856 packing Methods 0.000 claims abstract description 22
- 238000007664 blowing Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 8
- 239000004215 Carbon black (E152) Substances 0.000 abstract description 2
- 229930195733 hydrocarbon Natural products 0.000 abstract description 2
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000005457 optimization Methods 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013375 chromatographic separation Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000004811 liquid chromatography Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
-
- 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
- G01N30/62—Detectors specially adapted therefor
- G01N30/64—Electrical detectors
- G01N30/68—Flame ionisation detectors
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a multichannel sample injection gas chromatograph. The multichannel sample introduction gas chromatograph comprises a sample introduction system, a sample introduction switching system and a detector, wherein the sample introduction system comprises a sample introduction selection valve, a sampling gas path, a sample outlet gas path, a quantitative ring, a packing column I, a packing column II, a carrier gas inlet and a carrier gas outlet which are controlled by a controller; this kind gas chromatograph is advanced to multichannel, every group sampling system all mutual independence, mutual noninterference, realize the switching between the different sampling systems through the switching of system control six-way valve, avoid the interference between the component through the switching of ten-way valve, can be simultaneously on-line monitoring two or more than two sampling point position methane and the total hydrocarbon concentration of non-methane.
Description
Technical Field
The invention belongs to the technical field of chromatograph detection, and particularly relates to a multichannel sample injection gas chromatograph.
Background
A chromatograph is an apparatus for performing chromatographic separation analysis. Comprises a sample introduction system, a detection system, a recording and data processing system, a temperature control system, a mobile phase control system and the like. Modern chromatographs have the characteristics of high stability, sensitivity, versatility, high degree of automation and the like. There are gas chromatography, liquid chromatography, gel chromatography, and the like. These chromatographs are widely used for analyzing a certain content of a chemical product and a high molecular material, and gel chromatography can also measure the molecular weight and the distribution of the high molecular material; the traditional gas chromatograph cannot realize the switching of a plurality of sample introduction systems, is low in working efficiency and cannot well adapt to complex working requirements.
Disclosure of Invention
The invention aims to solve the problems and provide a multi-channel sample injection gas chromatograph which is simple in structure and reasonable in design.
The invention realizes the purpose through the following technical scheme:
a multichannel sample introduction gas chromatograph comprises a sample introduction system, a sample introduction switching system and a detector, wherein the sample introduction system comprises a sample introduction selection valve controlled by a controller, a sampling gas circuit, a sample outlet gas circuit, a quantitative ring, a packing column I, a packing column II, a carrier gas inlet and a carrier gas outlet, the sample introduction switching system comprises a switching selection valve controlled by the controller, an output port of the sampling gas circuit is connected with the sample introduction selection valve, an input port of the sample outlet gas circuit is connected with the sample introduction selection valve, an input port and an output port of the quantitative ring are connected with the sample introduction selection valve, an input port and an output port of the packing column I are connected with the sample introduction selection valve, an input port of the packing column II is connected with the sample introduction switching system, an input end of the carrier gas outlet is connected with the sample introduction selection valve, an output end of the carrier gas inlet is connected with the sample introduction selection valve, the sample introduction switching system is connected with the detector.
As a further optimization scheme of the invention, the sampling selection valve is provided with a sampling state, a back flushing state and a sampling state, wherein the sampling back flushing state is as follows: the sampling gas path is connected with the input port of the quantitative ring through a sampling selection valve, the output port of the quantitative ring is connected with the sample outlet gas path through a sampling selection valve, the number of carrier gas inlets is two, one group of carrier gas inlets are connected with the filling column I through a sampling selection valve and then connected with the carrier gas outlet through the feeding selection valve, the other group of carrier gas inlets are connected with the filling column II through a feeding selection valve, and the filling column II is connected with the sampling switching system; the sample introduction state is as follows: the sampling gas circuit passes through the introduction of a sample selector valve with it connects to go out the appearance gas circuit, the carrier gas entry pass through the introduction of a sample selector valve with the input port connection of ration ring, the output port of ration ring passes through the input port connection of feeding selector valve with packed column I, the output port of packed column I passes through the input port connection of feeding selector valve with packed column II, the output port of packed column II with introduction switching system connects.
As a further optimization scheme of the invention, the sample feeding system comprises a first sample feeding system, a second sample feeding system and a third sample feeding system, and the feeding selection valve is a ten-way valve.
As a further optimization scheme of the present invention, the sample injection switching system includes a first six-way valve and a second six-way valve, and the first six-way valve and the second six-way valve have two states, a state of which is one: 1. the No. 2 port is communicated with each other; 3. the No. 4 port is communicated with the other port; 5. the No. 6 port is communicated with the other port; and a second state: 2. the No. 3 ports are communicated; 4. the No. 5 ports are communicated; 1. no. 6 mouths communicate with each other, No. 6 mouths of first six-way valve are connected with No. 5 mouths of second six-way valve, No. 4 mouths of second six-way valve are connected with the detector, first sampling system is connected with No. 1 mouth of first six-way valve, second sampling system is connected with No. 5 mouths of first six-way valve, third sampling system is connected with No. 3 mouths of second six-way valve.
As a further optimization scheme of the invention, one of the first sample feeding system, the second sample feeding system and the third sample feeding system enters a sample feeding state, and the other two sample feeding systems enter a sampling and back flushing state.
As a further optimization scheme of the invention, when the first sample introduction system is in a sample introduction state, the first six-way valve and the second six-way valve are both in a state two; when the second sample introduction system is in a sample introduction state, the first six-way valve is in a first state, and the second six-way valve is in a second state; and when the third sample feeding system is in a sample feeding state, the first six-way valve and the second six-way valve are in a first state.
As a further optimization scheme of the invention, the detector comprises an FID detector, and an air inlet and a hydrogen inlet which are communicated with the FID detector.
The invention has the beneficial effects that: the system is provided with three groups of sample introduction systems, each group of sample introduction system is mutually independent and does not interfere with each other, the switching between different sample introduction systems is realized by controlling the switching of the six-way valve through the system, the interference between components is avoided by switching the ten-way valve, and the methane and non-methane total hydrocarbon concentrations of two or more sampling points can be monitored on line at the same time.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. a first sample outlet gas path; 2. a first sampling gas path; 3. a first flow meter; 4. a first solenoid valve; 5. a first quantity of rings; 6. a first packed column II; 7. a first ten-way valve; 8. a first packed column I; 9. a first carrier gas outlet; 10. a second sample outlet gas path; 11. a second sampling gas path; 12. a second flow meter; 13. a second solenoid valve; 14. a second dosing ring; 15. a second packed column II; 16. a twentieth valve; 17. a second packed column I; 18. a second carrier gas outlet; 19. a third sample outlet gas path; 20. a third sampling gas path; 21. a third flow meter; 22. a third electromagnetic valve; 23. a third dosing ring; 24. a third packed column II; 25. a thirty-third valve; 26. a third packed column I; 27. a third carrier gas outlet; 28. a first damper; 29. a second damper; 30. a first six-way valve; 31. a third damper; 32. a detector; 33. a second six-way valve; 34. an air inlet; 35. a hydrogen inlet; 36. a first carrier gas inlet; 37. a second carrier gas inlet; 38. a fourth damper; .
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
Example 1
As shown in figure 1, a multichannel sample introduction gas chromatograph comprises a sample introduction system, a sample introduction switching system and a detector, wherein the sample introduction system comprises a sample introduction selection valve, a sampling gas circuit, a sample outlet gas circuit, a quantitative ring, a packing column I, a packing column II, a carrier gas inlet and a carrier gas outlet which are controlled by a controller, the sample introduction switching system comprises a switching selection valve controlled by the controller, an output port of the sampling gas circuit is connected with the sample introduction selection valve, an input port of the sample outlet gas circuit is connected with the sample introduction selection valve, an input port and an output port of the quantitative ring are both connected with the sample introduction selection valve, an input port and an output port of the packing column I are both connected with the sample introduction selection valve, an input port of the packing column II is connected with the sample introduction switching system, an input port of the carrier gas outlet is connected with the sample introduction selection valve, the output end of the carrier gas inlet is connected with a sample introduction selection valve, and the sample introduction switching system is connected with the detector.
The sampling selection valve is provided with a sampling state, a back-blowing state and a sampling state, wherein the sampling back-blowing state is as follows: the sampling gas path is connected with the input port of the quantitative ring through a sampling selection valve, the output port of the quantitative ring is connected with the sample outlet gas path through a sampling selection valve, the number of carrier gas inlets is two, one group of carrier gas inlets are connected with the filling column I through a sampling selection valve and then connected with the carrier gas outlet through the feeding selection valve, the other group of carrier gas inlets are connected with the filling column II through a feeding selection valve, the filling column II is connected with the sampling switching system, and the carrier gas inlets are divided into a first carrier gas inlet 36 and a second carrier gas inlet 37; the sample introduction state is as follows: the sampling gas path is connected with the sample outlet gas path through the sample inlet selection valve, the carrier gas inlet is connected with the input port of the quantitative ring through the sample inlet selection valve, the output port of the quantitative ring is connected with the input port of the packing column I through the feed selection valve, the output port of the packing column I is connected with the input port of the packing column II through the feed selection valve, and the output port of the packing column II is connected with the sample inlet switching system;
the sample feeding system comprises a first sample feeding system, a second sample feeding system and a third sample feeding system, and the feeding selection valve is a ten-way valve;
the sample feeding switching system comprises a first six-way valve 30 and a second six-way valve 33, and the first six-way valve 30 and the second six-way valve 33 both have two states, namely: 1. the No. 2 port is communicated with each other; 3. the No. 4 port is communicated with the other port; 5. the No. 6 port is communicated with the other port; and a second state: 2. the No. 3 ports are communicated; 4. the No. 5 ports are communicated; 1. no. 6 mouths communicate with each other, No. 6 mouths of first six-way valve 30 are connected with No. 5 mouths of second six-way valve 33, No. 4 mouths of second six-way valve 33 are connected with the detector, first sampling system is connected with No. 1 mouth of first six-way valve 30, second sampling system is connected with No. 5 mouths of first six-way valve 30, third sampling system is connected with No. 3 mouths of second six-way valve 33.
One of the first sample feeding system, the second sample feeding system and the third sample feeding system enters a sample feeding state, and the other two sample feeding systems enter a sampling and back blowing state;
when the first sample introduction system is in a sample introduction state, the first six-way valve 30 and the second six-way valve 33 are both in a state two; when the second sample introduction system is in a sample introduction state, the first six-way valve 30 is in a first state, and the second six-way valve 33 is in a second state; when the third sample feeding system is in a sample feeding state, the first six-way valve 30 and the second six-way valve 33 are both in a first state;
the detector includes a FID detector 32 and an air inlet 34, a hydrogen inlet 35 in communication with the FID detector 32.
The first damper 28 is connected to the port 2 of the first six-way valve 30, the second damper 29 is connected to the port 4 of the first six-way valve 30, the fourth damper 38 is connected to the port 2 of the second six-way valve 33, and the third damper 31 is connected to the port 6 of the second six-way valve 33.
When the multichannel sample introduction gas chromatograph is used, the first sample introduction system comprises a first sample outlet gas path 1, a first sampling gas path 2, a first flowmeter 3, a first electromagnetic valve 4, a first quantitative ring 5, a first filling column II 6, a first ten-way valve 7, a first filling column I8 and a first carrier gas outlet 9; the second sample introduction system comprises a second sample outlet gas circuit 10, a second sampling gas circuit 11, a second flowmeter 12, a second electromagnetic valve 13, a second quantitative ring 14, a second packing column II 15, a twentieth valve 16, a second packing column I17 and a second carrier gas outlet 18; the third sample inlet system comprises a third sample outlet gas path 19, a third sampling gas path 20, a third flow meter 21, a third electromagnetic valve 22, a third quantitative ring 23, a third packing column II 24, a thirty-way valve 25, a third packing column I26 and a third carrier gas outlet 27;
in this embodiment: an input port of a first sample outlet gas circuit 1 is connected with a port 10 of a first ten-way valve 7, an output port of the first sampling gas circuit 2 is connected with a port 1 of the first ten-way valve 7, a flow meter 3 and a first electromagnetic valve 4 are both positioned in the first sampling gas circuit 2, an output port of a first filling column I8 is connected with a port 3 of the first ten-way valve 7, an input port of the first filling column I8 is connected with a port 6 of the first ten-way valve 7, an input port of a first quantitative ring 5 is connected with a port 2 of the first ten-way valve 7, an output port of the first quantitative ring 5 is connected with a port 9 of the first ten-way valve 7, an input port of a first filling column II 6 is connected with a port 7 of the first ten-way valve 7, an output port of the first filling column II 6 is connected with a port 1 of a first six-way valve 30, and an input port of a first carrier gas outlet 9 is connected with a port 4 of the first ten;
the connection mode of the second sample feeding system and the third sample feeding system is basically the same as that of the first sample feeding system, and the connection mode is different from that of the first sample feeding system in that: an output port of a second filling column II 15 in the second sample injection system is connected with a port 5 of the first six-way valve 30, an output port of a third filling column II 24 in the third sample injection system is connected with a port 3 of the second six-way valve 33, and it is further noted that the carrier gas inlet is divided into a first carrier gas inlet 36 and a second carrier gas inlet 37, wherein 99.999% high-purity nitrogen gas is introduced, the first carrier gas inlet 36 is respectively communicated with a port 8 of the first ten-way valve 7, a port 8 of the twenty-way valve 16 and a port 8 of the thirty-way valve 25, and the second carrier gas inlet 37 is respectively communicated with a port 5 of the first ten-way valve 7, a port 5 of the twenty-way valve 16 and a port 5 of the thirty-way valve 25;
in practical use, the capacity of the quantitative ring is 1.2ml, the air is clean compressed air, and when the first sample injection system and the second sample injection system are in sampling and back flushing states, the gas enters the No. 1 port of each ten-way valve from the sampling gas circuit of the first sample injection system and the sampling gas circuit of the second sample injection system through the flow meter and the electromagnetic valve, enters the quantitative ring from the No. 2 port of each ten-way valve through each ten-way valve, enters the No. 9 port of each ten-way valve, and then is discharged out of the chromatograph through the No. 10 port of each ten-way valve; at this time, the carrier gas enters the ports 5 and 8 of the first ten-way valve 7 and the twenty-way valve 16 through the first carrier gas inlet 36 and the second carrier gas inlet 37, respectively, enters the respective packed columns a and B through the ports 6 and 7 of the ten-way valves, and then is discharged out of the sample injection system. At this time, the third sample inlet system is in a sample injection state, at this time, the third sampling gas circuit 20 enters the port 1 of the thirty-first valve 25 through the flow meter and the electromagnetic valve, and is discharged from the chromatograph through the outlet port 10 through the thirty-first valve 25, the carrier gas enters the port 5 and the port 8 of the thirty-first valve 25 through the first carrier gas inlet 36 and the second carrier gas inlet 37, respectively, the carrier gas entering the port 5 of the thirty-first valve 25 exits the chromatograph through the port 4 of the thirty-first valve 25, the carrier gas entering the port 8 of the thirty-first valve 25 enters the third quantitative ring 23 through the port 9 of the thirty-first valve 25, the carrier gas enters the third filling column i 26 through the port 2 and the port 3 of the thirty-first valve 25, enters the third filling column ii 24 through the port 6 and the port 7 of the thirty-first valve 25, and finally enters the FID detector 32 through the port 3 and the port 4 of the second six-first valve 33, the whole device is relatively practical.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (7)
1. A multi-channel sample injection gas chromatograph is characterized by comprising a sample injection system, a sample injection switching system and a detector, wherein the sample injection system comprises a sample injection selection valve, a sampling gas circuit, a sample outlet gas circuit, a quantitative ring, a packing column I, a packing column II, a carrier gas inlet and a carrier gas outlet which are controlled by a controller, the sample injection switching system comprises a switching selection valve controlled by the controller, an output port of the sampling gas circuit is connected with the sample injection selection valve, an input port of the sample outlet gas circuit is connected with the sample injection selection valve, an input port and an output port of the quantitative ring are both connected with the sample injection selection valve, an input port and an output port of the packing column I are both connected with the sample injection selection valve, an input port of the packing column II is connected with the sample injection switching system, an input port of the carrier gas outlet is connected with the sample injection selection valve, the output end of the carrier gas inlet is connected with a sample introduction selection valve, and the sample introduction switching system is connected with the detector.
2. A multichannel sample introduction gas chromatograph according to claim 1, characterized in that: the sampling selection valve is provided with a sampling state, a back-blowing state and a sampling state, wherein the sampling back-blowing state is as follows: the sampling gas path is connected with the input port of the quantitative ring through a sampling selection valve, the output port of the quantitative ring is connected with the sample outlet gas path through a sampling selection valve, the number of carrier gas inlets is two, one group of carrier gas inlets are connected with the filling column I through a sampling selection valve and then connected with the carrier gas outlet through the feeding selection valve, the other group of carrier gas inlets are connected with the filling column II through a feeding selection valve, and the filling column II is connected with the sampling switching system; the sample introduction state is as follows: the sampling gas circuit passes through the introduction of a sample selector valve with it connects to go out the appearance gas circuit, the carrier gas entry pass through the introduction of a sample selector valve with the input port connection of ration ring, the output port of ration ring passes through the input port connection of feeding selector valve with packed column I, the output port of packed column I passes through the input port connection of feeding selector valve with packed column II, the output port of packed column II with introduction switching system connects.
3. A multichannel sample introduction gas chromatograph according to claim 2, characterized in that: the sampling system comprises a first sampling system, a second sampling system and a third sampling system, and the feeding selection valve is a ten-way valve.
4. A multichannel sample introduction gas chromatograph according to claim 3, characterized in that: the sampling switching system comprises a first six-way valve and a second six-way valve, and the first six-way valve and the second six-way valve have two states, namely a first state: 1. the No. 2 port is communicated with each other; 3. the No. 4 port is communicated with the other port; 5. the No. 6 port is communicated with the other port; and a second state: 2. the No. 3 ports are communicated; 4. the No. 5 ports are communicated; 1. no. 6 mouths communicate with each other, No. 6 mouths of first six-way valve are connected with No. 5 mouths of second six-way valve, No. 4 mouths of second six-way valve are connected with the detector, first sampling system is connected with No. 1 mouth of first six-way valve, second sampling system is connected with No. 5 mouths of first six-way valve, third sampling system is connected with No. 3 mouths of second six-way valve.
5. The multichannel sample introduction gas chromatograph of claim 4, wherein: and any one of the first sample feeding system, the second sample feeding system and the third sample feeding system enters a sample feeding state, and the other two sample feeding systems enter a sampling and back blowing state.
6. The multichannel sample introduction gas chromatograph of claim 5, wherein: when the first sample introduction system is in a sample introduction state, the first six-way valve and the second six-way valve are in a state two; when the second sample introduction system is in a sample introduction state, the first six-way valve is in a first state, and the second six-way valve is in a second state; and when the third sample feeding system is in a sample feeding state, the first six-way valve and the second six-way valve are in a first state.
7. The multichannel sample introduction gas chromatograph of claim 6, wherein: the detector comprises an FID detector, and an air inlet and a hydrogen inlet which are communicated with the FID detector.
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