CN210604532U - Chromatographic detection device - Google Patents
Chromatographic detection device Download PDFInfo
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- CN210604532U CN210604532U CN201822027409.9U CN201822027409U CN210604532U CN 210604532 U CN210604532 U CN 210604532U CN 201822027409 U CN201822027409 U CN 201822027409U CN 210604532 U CN210604532 U CN 210604532U
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Abstract
The utility model provides a chromatogram detection device, which comprises a container and a combustion chamber, wherein the combustion chamber is arranged in the container, and the container is provided with an inlet and an outlet; the air channel is provided with a flow controller, and the air after flow control enters the container through a first branch and enters the combustion chamber through a second branch; the sample gas channel is communicated with the combustion chamber; the combustible gas channel is provided with a switching unit, a first outlet of the switching unit is communicated with the combustion chamber through a third branch, and a second outlet of the switching unit is communicated with the combustion chamber through a fourth branch; a first flow rate limiting unit disposed on the second branch; a second flow limiting unit disposed on the fourth branch. The utility model has the advantages of simple structure, automation and the like.
Description
Technical Field
The utility model relates to a chromatographic analysis, in particular to chromatographic detection device.
Background
In recent years, gas chromatography has become more and more widely used in the field of environmental protection driven by national policies. In order to improve the field detection efficiency and the effectiveness of data measurement, on-line gas chromatography and portable gas chromatography are carried out. With the increase of application scenes, the requirements on gas chromatography detectors are higher and higher in order to meet the requirements of different working conditions. In some petrochemical industries, especially in places with explosion hazards, the existing gas chromatography detectors (such as FID and FPD) cannot be directly used in explosion sites due to the fact that large power output is required and flame exists, and combustible gas can be caused to burn and explode; and the detector with low power consumption, such as PID, can not meet the requirement of accurate detection in the field due to the limitation of detection capability.
In order to meet the detection requirements of the petrochemical industry, particularly in places with explosion hidden dangers, the power of a detector is limited, and meanwhile, flames which cause combustion and explosion of combustible gas are packaged in a relatively closed space, so that the flames and an energy source are isolated from the environment of the combustible gas. The flame burning of existing detectors in an enclosed space and how the generated moisture is vented out of the detector cavity becomes relatively difficult compared to an open environment. The prior detector technology has the following defects:
1. use requirements that are not sufficient for application in explosive scenarios;
2. after the flame of the detector is packaged in a closed space, water vapor generated by combustion cannot be discharged in time and flows back to the inside of the detector, so that the flame temperature required by sample ionization is not maintained; and a high-temperature and high-humidity environment is formed, so that the accelerated aging of other devices in the closed space is easily caused, and the service life is shortened;
3. if the generation of water vapor is reduced by reducing the flow of hydrogen and increasing the flow of combustion-supporting gas, ignition may be more difficult due to the reduction of hydrogen-to-air ratio.
SUMMERY OF THE UTILITY MODEL
In order to solve the deficiencies in the prior art schemes, the utility model provides a chromatogram detection device that ignition success rate is high, automatic operation and maintenance.
The utility model aims at realizing through the following technical scheme:
a chromatographic test device comprising a vessel, a combustion chamber disposed within the vessel, the vessel having an inlet and an outlet; the chromatography detection apparatus further comprises:
the air channel is provided with a flow controller, and the air after flow control enters the container through a first branch and enters the combustion chamber through a second branch;
the sample gas channel is communicated with the combustion chamber;
the combustible gas channel is provided with a switching unit, a first outlet of the switching unit is communicated with the combustion chamber through a third branch, and a second outlet of the switching unit is communicated with the combustion chamber through a fourth branch;
a first flow rate limiting unit disposed on the second branch;
a second flow limiting unit disposed on the fourth branch.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
1. the sealed container and the flame retardant devices arranged at the inlet and the outlet enable the chromatographic detection device to be applied to dangerous occasions with explosion hidden danger;
2. the ratio of air to combustible gas in the ignition stage and the operation stage is adjusted, so that the ignition success rate is improved;
3. the air channel is designed into two branches, so that water vapor in the sealed container is discharged through a large-flow (first) branch, and meanwhile, ignition is realized through a small-flow (second) branch;
4. the combustible gas channel is designed into two branches, deposited carbon in the combustion chamber is cleaned through a large-flow (third) branch, and ignition is realized through a small-flow (fourth) branch;
5. the device has the advantages of small volume, ingenious design and high reliability, and is suitable for continuously monitoring pollution sources and portable chromatography of volatile organic compounds in air.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. In the figure:
FIG. 1 is a schematic view of a chromatography detection apparatus according to embodiments 1 to 2 of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of teaching the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or substitutions from these embodiments that will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 schematically shows a schematic structural diagram of a chromatography detection apparatus according to an embodiment of the present invention, and as shown in fig. 1, the chromatography detection apparatus includes:
a vessel 11, a combustion chamber disposed within the vessel, the vessel having an inlet and an outlet;
the air channel is provided with a flow controller, and the air after flow control enters the container through a first branch and enters the combustion chamber through a second branch;
the sample gas channel is communicated with the combustion chamber;
the combustible gas channel is provided with a switching unit, a first outlet of the switching unit is communicated with the combustion chamber through a third branch, and a second outlet of the switching unit is communicated with the combustion chamber through a fourth branch;
a first flow rate limiting unit disposed on the second branch;
a second flow rate limiting unit provided on the fourth branch;
and flame retardants 21-22 respectively arranged at the inlet and the outlet of the container.
Further, the second branch communicates with the sample channel for ignition and flame maintenance, such that air, sample gas and combustible gas mix before entering the combustion chamber.
The utility model discloses the chromatogram detection method, also the working process of above-mentioned chromatogram detection device, the chromatogram detection method includes following step:
and (3) an ignition stage: in the air passage, the flow rate through the flow rate controller is V1Is divided intoThe two paths enter the container through the first branch to purge the combustion chamber, and enter the combustion chamber after the flow of the second branch is limited;
in the combustible gas channel, combustible gas flows out of the second outlet through the switching of the switching unit, enters the combustion chamber after the flow is limited and is ignited;
the sample gas channel is closed, and no sample gas enters the combustion chamber;
and (3) an operation stage: in the air passage, the flow rate through the flow rate controller is V2Is divided into two paths, V2＞V1The fuel enters the container through the first branch to purge the combustion chamber, and enters the combustion chamber after the flow of the second branch is limited;
in the combustible gas channel, through the switching of the switching unit, the combustible gas flows out of the second outlet, enters the combustion chamber for combustion after being limited by the flow of the fourth branch, and maintains flame; the water vapor in the container is discharged from an outlet of the container;
in the sample gas channel, sample gas enters the combustion chamber;
and (3) a maintenance stage: in the air channel, air enters the container through the first branch to purge the combustion chamber, and enters the combustion chamber after being limited by the flow of the second branch;
a combustible gas channel: through the switching of the switching unit, the combustible gas flows out of the first outlet and then enters the combustion chamber; the mixed air and combustible gas clean the surface of the combustion chamber of deposited carbon;
in the process, the occupation ratio of combustible gas in the ignition stage is higher than that in the operation stage, so that the ignition success rate is improved; meanwhile, in the first branch, air enters the container only through the pipeline; in the maintenance phase, in the fourth branch, the combustible gas only enters the combustion chamber through the pipeline, and the measure improves the flow rate of the air or the combustible gas in the channel, thereby improving the purging effect.
Example 2:
according to the utility model discloses embodiment 1's chromatographic detection device and application example of method.
In the application example, the flow limiting unit adopts a flow restrictor, and the switching unit adopts a three-way valve; arranging a flow controller in the combustible gas channel, wherein air enters the combustible gas flow in the channel; the combustible gas adopts hydrogen; the third branch is connected with the outlet of the fourth branch, and the second branch is communicated with the sample gas channel and then communicated with the combustible gas channel, so that the air, the sample gas and the combustible gas are mixed before being introduced into the combustion chamber; during the operational phase, moisture in the container is vented out of the container through the flame arrestor 22.
Claims (3)
1. A chromatographic test device comprising a vessel, a combustion chamber disposed within the vessel, the vessel having an inlet and an outlet; the method is characterized in that: the chromatography detection apparatus further comprises:
the air channel is provided with a flow controller, and the air after flow control enters the container through a first branch and enters the combustion chamber through a second branch;
the sample gas channel is communicated with the combustion chamber;
the combustible gas channel is provided with a switching unit, a first outlet of the switching unit is communicated with the combustion chamber through a third branch, and a second outlet of the switching unit is communicated with the combustion chamber through a fourth branch;
a first flow rate limiting unit disposed on the second branch;
a second flow limiting unit disposed on the fourth branch.
2. The chromatography detection apparatus according to claim 1, characterized in that: and the inlet and the outlet of the container are respectively provided with a flame retardant device.
3. The chromatography detection apparatus according to claim 1, characterized in that: the second branch is communicated with the sample gas channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822027409.9U CN210604532U (en) | 2018-12-04 | 2018-12-04 | Chromatographic detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822027409.9U CN210604532U (en) | 2018-12-04 | 2018-12-04 | Chromatographic detection device |
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| Publication Number | Publication Date |
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| CN210604532U true CN210604532U (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822027409.9U Active CN210604532U (en) | 2018-12-04 | 2018-12-04 | Chromatographic detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521131A (en) * | 2018-12-04 | 2019-03-26 | 杭州谱育科技发展有限公司 | Chromatographic detection apparatus and method |
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2018
- 2018-12-04 CN CN201822027409.9U patent/CN210604532U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521131A (en) * | 2018-12-04 | 2019-03-26 | 杭州谱育科技发展有限公司 | Chromatographic detection apparatus and method |
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