CN114527216A - Portable ultra-fast gas chromatograph - Google Patents
Portable ultra-fast gas chromatograph Download PDFInfo
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- CN114527216A CN114527216A CN202210169632.5A CN202210169632A CN114527216A CN 114527216 A CN114527216 A CN 114527216A CN 202210169632 A CN202210169632 A CN 202210169632A CN 114527216 A CN114527216 A CN 114527216A
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- 239000007789 gas Substances 0.000 claims abstract description 102
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 239000002912 waste gas Substances 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 238000010897 surface acoustic wave method Methods 0.000 abstract description 17
- 238000004458 analytical method Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000011208 chromatographic data Methods 0.000 abstract description 2
- 239000012159 carrier gas Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 210000003437 trachea Anatomy 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
-
- 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
- G01N30/76—Acoustical detectors
-
- 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
- G01N2030/022—Column chromatography characterised by the kind of separation mechanism
- G01N2030/027—Liquid chromatography
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a portable ultra-fast gas chromatograph, which comprises an instrument body, wherein a He gas inflation interface, a waste gas outlet and a sampling interface are arranged on the instrument body, a gas tank, a two-position five-way electromagnetic valve, a cylinder, a trap, a six-way valve, a miniature SAW detector, an EPC and a chromatographic column are arranged in the instrument body, the waste gas outlet, the sampling interface, the trap, the EPC and the chromatographic column correspond to the valve port of the six-way valve in position, the telescopic end of the cylinder is connected with a rotating shaft of a valve body of the six-way valve through a transmission device, and the He gas inflation interface is communicated with the gas tank through a gas pipe. The invention adopts a micro SAW (surface acoustic wave) detector, can quickly detect the dielectric constant of gas on the surface of the sensor, outputs a frequency signal, thereby calculating the concentration of the gas, finishes one-time detection within 60 seconds, namely the whole analysis period is less than 60 seconds from the beginning of sampling to the end of uploading chromatographic data, and can realize ultra-fast analysis.
Description
Technical Field
The invention relates to the technical field of gas chromatography analysis, in particular to a portable ultra-fast gas chromatograph.
Background
The chromatographic column utilizes the chromatographic column to firstly separate the mixture gas, then utilizes the detector to sequentially detect the separated components, the mixture gas is carried in by the carrier gas, the components are separated through the chromatographic columns with different retention performances of the components in the mixture to be detected, and the components are sequentially led into the detector, so as to obtain the detection signals of the components. According to the sequence of leading in the detector, the components can be distinguished by comparison, and the content of each component can be calculated according to the peak height or peak area.
For the application of on-site quantitative analysis of dangerous gases (such as biochemical weapon gases), the long analysis time can threaten human life. The traditional gas chromatograph is difficult to meet the requirements, the analysis time is long, from sampling to enrichment, to desorption and separation, the time is about twenty minutes, and the portable ultra-fast gas chromatograph is inconvenient to carry.
Disclosure of Invention
The invention aims to provide a portable ultra-fast gas chromatograph, which aims to solve the problems that the traditional gas chromatograph has a large column box, cannot be miniaturized and has low detection speed in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a portable ultra-fast gas chromatograph comprises an instrument body, wherein the instrument body is provided with a He gas charging interface, a waste gas outlet and a sampling interface, the instrument body is internally provided with a gas tank, a two-position five-way electromagnetic valve, a cylinder, a trap, a six-way valve, a miniature SAW detector, an EPC and a chromatographic column, the waste gas outlet, the sampling interface, the trap, the EPC and the chromatographic column all correspond to the valve port of the six-way valve, the telescopic end of the cylinder is connected with a valve body rotating shaft of the six-way valve through a transmission device, the He gas charging interface is communicated with a gas tank through a gas pipe, the gas tank is respectively communicated with the two-position five-way electromagnetic valve and the EPC through gas pipes, the EPC is communicated with the six-way valve through a gas pipe, and a gas inlet of the chromatographic column is communicated with the six-way valve through a gas pipe, one end of the miniature SAW detector is connected to a gas outlet of the chromatographic column, and the other end of the miniature SAW detector is connected with an air filter.
In a preferred embodiment of the present invention, the He gas charging interface is a quick connector with a one-way valve, and the gas tank is provided with fixed connectors at both ends and fixed inside the instrument body through the fixed connectors.
In a preferred embodiment of the invention, a pressure sensor, a pressure reducing valve, a pressure gauge and a two-way handle machine control valve are arranged on an air pipe connected with the air tank, and the pressure sensor is connected with an in-instrument control circuit through a line.
In a preferred embodiment of the present invention, the two-position five-way solenoid valve is connected to a cylinder control port, and the rotational positions of the six-way valve include a sample position and an inject position.
In a preferred embodiment of the present invention, the air tube connected to the micro SAW detector and the air tube connected to the EPC are both provided with a filter, and the connection between the micro SAW detector and the air tube of the EPC and the connection between the micro SAW detector and the sampling interface are both connected to an air pump.
And a needle valve is arranged between the air pump connected with the six-way valve and the EPC.
Compared with the prior art, the invention has the beneficial effects that:
the gas chromatograph can be small in size, light in weight and convenient to carry, meanwhile, the micro SAW (surface acoustic wave) detector is adopted, the dielectric constant of gas on the surface of the sensor can be rapidly detected, a frequency signal is output, the concentration of the gas is calculated, one-time detection is completed within 60 seconds, namely the whole analysis period is less than 60 seconds from the beginning of sampling to the end of uploading chromatographic data, and ultra-rapid analysis can be realized.
Drawings
FIG. 1 is a gas path structure diagram of the six-way valve in a sample position;
fig. 2 is a gas path structure diagram of the six-way valve in the reject position.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution:
a portable ultra-fast gas chromatograph comprises an apparatus body, wherein a He gas charging interface, a waste gas outlet and a sampling interface are arranged on the apparatus body, a gas tank, a two-position five-way electromagnetic valve, a cylinder, a trap, a six-way valve, a miniature SAW detector, an EPC and a chromatographic column are arranged in the apparatus body, the waste gas outlet, the sampling interface, the trap, the EPC and the chromatographic column all correspond to the valve port position of the six-way valve, the telescopic end of the cylinder is connected with a rotating shaft of a valve body of the six-way valve through a transmission device, the He gas charging interface is communicated with the gas tank through a gas pipe, the gas tank is respectively communicated with the two-position five-way electromagnetic valve and the EPC through gas pipes, the EPC is communicated with the six-way valve through a gas pipe, one end of the miniature SAW detector is connected to the gas outlet of the chromatographic column, the other end of the miniature SAW detector is connected with an air filter, the invention adopts a design without a column box, a stainless steel chromatographic column is adopted, voltage is applied to two ends of the chromatographic column by using the resistance of the chromatographic column, the chromatographic column is heated, meanwhile, a superfine temperature sensor is directly wound on the surface of the chromatographic column, the rapid response of temperature measurement is realized, the rapid temperature control is realized, and the linear temperature rise of 10 ℃/S is realized by matching with a software algorithm.
The quick-operation joint of interface for having the check valve is aerifyd to the He gas, and the gas pitcher both ends are equipped with fixed joint, and the gas pitcher is fixed in the inside of instrument body through fixed joint, and quick assembly disassembly is realized through the quick-operation joint of check valve to outside aerating device, and the check valve makes the He gas only advance not to go out. The gas pitcher adopts independent fixed mode, the dismouting is carried out to the accessible screw, quick replacement's effect has been realized, be equipped with pressure sensor on the trachea that the gas pitcher is connected, the relief pressure valve, manometer and two-way handle machine accuse valve, pressure sensor passes through the circuit and is connected with instrument control circuit, pressure sensor can carry out real-time supervision to the pressure of He gas in the gas pitcher, calculate He gas residual capacity, decompress to 0.58MPa through the pressure of the He gas of relief pressure valve in with the pipeline, the manometer monitors the pressure of relief pressure valve rear end He gas, two-way handle machine accuse valve control outflow of He gas, the He gas after the outflow divide into two tunnel, flow to the flow direction EPC all the way, another way flow direction two five-way solenoid valve, drive actuating cylinder.
The two-position five-way electromagnetic valve is connected to the cylinder control port, the rotating position of the six-way valve comprises a sample position and an Inject position, the two-position five-way electromagnetic valve is matched with the gas path to drive the telescopic end of the cylinder to move so as to realize the position switching of the six-way valve, the six-way valve is switched to the sample position, the sampling interface, the trapping trap and the gas pump form a passage, the six-way valve is switched to the Inject position, and the chromatographic column and the EPC form a passage.
The air pipe that miniature SAW detector is connected and the trachea that EPC connects all are equipped with the filter on, and miniature SAW detector all is connected with the air pump with the trachea junction of EPC and the junction of sampling interface, and the filter mainly realizes supplying filterable effect to the air that sweeps miniature SAW detector and the He gas that EPC output, has improved gaseous purity, and sampling air pump effect is with sample gas suction capture trap, and detector sweep gas pump effect is with air blowin detector. A needle valve is arranged between the air pump connected with the six-way valve and the EPC, plays a role in damping air flow and is more beneficial to accurately controlling flow.
In the comprehensive way, carrier gas is helium, the carrier gas is stored in a gas tank, the gas is inflated from an inflation port, the inflation port is a quick connector with a one-way valve, a pressure sensor detects the pressure of the gas tank, the detected pressure value is uploaded to a workstation, the gas tank can be detached from a case, a button machine control valve is pressed first before the gas tank is detached, residual gas in the gas tank is released (the gas tank has pressure and is difficult to remove if not released), the helium in the gas tank is reduced to 0.58MPa through a pressure reducing valve, a mechanical pressure gauge displays the reduced pressure value, in the working process, a handle machine control valve is opened first, a gas path is divided into two paths, one path flows to an EPC, the other path flows to a two-position five-way electromagnetic valve, a cylinder is driven, the six-way valve is switched to a sample position, a sampling interface, a trapping trap and a gas pump form a path, the gas pump sucks a sample from the sampling port, the sample flows into the trapping trap through the six-way valve and is enriched in the trapping trap, and finally, discharging the gas from a waste gas port, switching the six-way valve to an Inject position, enabling the carrier gas to flow out of the needle valve and then enter the trap through the six-way valve, wherein the carrier gas blows out the gas adsorbed in the trap in the process, then flows through the six-way valve again and enters the chromatographic column, separating the sample gas in the chromatographic column, and distinguishing the types of the gas by the time (retention time) when different gases flow out of the chromatographic column.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A portable ultra-fast gas chromatograph is characterized in that: the instrument comprises an instrument body, wherein a He gas inflation interface, a waste gas outlet and a sampling interface are arranged on the instrument body, a gas tank, a two-position five-way electromagnetic valve, a cylinder, a trapping well, a six-way valve, a miniature SAW detector, an EPC and a chromatographic column are arranged inside the instrument body, the waste gas outlet, the sampling interface, the trapping well, the EPC and the chromatographic column correspond to the valve port of the six-way valve in position, the telescopic end of the cylinder is connected with a valve body rotating shaft of the six-way valve through a transmission device, the He gas inflation interface is communicated with the gas tank through a gas pipe, the gas tank is communicated with the two-position five-way electromagnetic valve and the EPC through gas pipes respectively, the EPC is communicated with the six-way valve through a gas pipe, a gas inlet of the chromatographic column is communicated with the six-way valve through a gas pipe, one end of the miniature SAW detector is connected to the gas outlet of the chromatographic column, and the other end of the miniature SAW detector is connected with an air filter.
2. The portable ultra-fast gas chromatograph of claim 1, wherein: the He gas charging interface is a quick joint with a one-way valve, the two ends of the gas tank are provided with fixed joints, and the gas tank is fixed in the instrument body through the fixed joints.
3. The portable ultra-fast gas chromatograph of claim 1, wherein: and a pressure sensor, a pressure reducing valve, a pressure gauge and a two-way handle machine control valve are arranged on an air pipe connected with the air tank, and the pressure sensor is connected with a control circuit in the instrument through a line.
4. A portable ultra-fast gas chromatograph according to claim 1, wherein: the two-position five-way electromagnetic valve is connected to a cylinder control port, and the rotating position of the six-way valve comprises a sample position and an inject position.
5. The portable ultra-fast gas chromatograph of claim 1, wherein: the air pipe connected with the miniature SAW detector and the air pipe connected with the EPC are both provided with filters, and the connection part of the miniature SAW detector and the air pipe of the EPC and the connection part of the sampling interface are both connected with air pumps.
6. The portable ultra-fast gas chromatograph of claim 1, wherein: and a needle valve is arranged between the air pump connected with the six-way valve and the EPC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210169632.5A CN114527216A (en) | 2022-02-23 | 2022-02-23 | Portable ultra-fast gas chromatograph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210169632.5A CN114527216A (en) | 2022-02-23 | 2022-02-23 | Portable ultra-fast gas chromatograph |
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| Publication Number | Publication Date |
|---|---|
| CN114527216A true CN114527216A (en) | 2022-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210169632.5A Pending CN114527216A (en) | 2022-02-23 | 2022-02-23 | Portable ultra-fast gas chromatograph |
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| Country | Link |
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| CN (1) | CN114527216A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201237586Y (en) * | 2007-12-25 | 2009-05-13 | 马如森 | Optical ionization gas analyzer with automatic sampling apparatus |
| CN201637726U (en) * | 2009-12-08 | 2010-11-17 | 中国科学院生态环境研究中心 | Handheld gas chromatograph |
| CN210090394U (en) * | 2019-06-05 | 2020-02-18 | 山东华度检测有限公司 | Antifouling device of high-efficient gas chromatograph |
| CN111024849A (en) * | 2019-12-25 | 2020-04-17 | 中国科学院声学研究所 | Method and system for reducing external interference of surface acoustic wave gas chromatograph |
| CN111595994A (en) * | 2020-06-24 | 2020-08-28 | 中国科学院空天信息创新研究院 | Integrated portable high-precision MicroGC-mu TCD detector |
-
2022
- 2022-02-23 CN CN202210169632.5A patent/CN114527216A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201237586Y (en) * | 2007-12-25 | 2009-05-13 | 马如森 | Optical ionization gas analyzer with automatic sampling apparatus |
| CN201637726U (en) * | 2009-12-08 | 2010-11-17 | 中国科学院生态环境研究中心 | Handheld gas chromatograph |
| CN210090394U (en) * | 2019-06-05 | 2020-02-18 | 山东华度检测有限公司 | Antifouling device of high-efficient gas chromatograph |
| CN111024849A (en) * | 2019-12-25 | 2020-04-17 | 中国科学院声学研究所 | Method and system for reducing external interference of surface acoustic wave gas chromatograph |
| CN111595994A (en) * | 2020-06-24 | 2020-08-28 | 中国科学院空天信息创新研究院 | Integrated portable high-precision MicroGC-mu TCD detector |
Non-Patent Citations (2)
| Title |
|---|
| 宗兆伟 等: "便携式有毒有害气体检测仪在污染源在线监测中的应用", 现代仪器, no. 2, pages 55 - 56 * |
| 朱佐刚 等: "气相色谱-表面声波快速分析仪性能评价", 分析科学学报, vol. 26, no. 3, pages 338 - 340 * |
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Application publication date: 20220524 |