CN113109490A - Gas sampling device and system - Google Patents
Gas sampling device and system Download PDFInfo
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- CN113109490A CN113109490A CN202110393103.9A CN202110393103A CN113109490A CN 113109490 A CN113109490 A CN 113109490A CN 202110393103 A CN202110393103 A CN 202110393103A CN 113109490 A CN113109490 A CN 113109490A
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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
Abstract
The embodiment of the invention discloses a gas sampling device and a gas sampling system. The gas sampling device comprises: a main pipeline having a passage defined therein; a plurality of sampling lines for receiving sample gas, each of said sampling lines being in direct communication with said channel; and a sample outlet pipeline directly communicated with the channel and used for conveying the sample gas received by the sampling pipeline outwards. The technical scheme of the invention can realize sampling from a plurality of different sampling points.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a gas sampling device and a gas sampling system.
Background
The deuterium-tritium fuel circulation system contains a large amount of tritium, and by accurately metering and monitoring tritium-containing gas at different process positions in the deuterium-tritium fuel circulation system in real time, on one hand, the tritium distribution in the fuel circulation system can be known, the operation efficiency is optimized, the safe and continuous operation of a reactor is ensured, on the other hand, the discharge amount of the tritium is ensured to be lower than a specified limit value, so that the public is prevented from suffering from the risk of exposure of overdose.
Generally, a tritium-containing gas is measured by a gas chromatography analyzer. However, as for a deuterium-tritium fuel circulation system, the number of gas sampling points is large, the concentration difference is large, and the accuracy and stability of gas chromatography analysis data are difficult.
Disclosure of Invention
According to a first aspect of the present application, there is provided a gas sampling device comprising:
a main pipeline having a passage defined therein;
a plurality of sampling lines for receiving sample gas, each of said sampling lines being in direct communication with said channel; and
and the sample outlet pipeline is directly communicated with the channel and is used for conveying the sample gas received by the sampling pipeline outwards.
According to a second aspect of the present application, there is provided a gas sampling system comprising:
a gas sampling device as described above; and
a control device configured to: and controlling the gas path on-off device of the gas sampling device to conduct the corresponding sampling pipeline according to the received sampling instruction.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
FIG. 1 is a schematic diagram of a gas sampling assembly according to one embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a gas sampling assembly according to one embodiment of the present invention;
FIG. 3 is a schematic perspective view of a gas sampling system according to one embodiment of the present invention; the arrows in the figure indicate the gas flow direction;
FIG. 4 is a schematic block diagram of a gas sampling system according to one embodiment of the present invention.
It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.
Description of reference numerals:
10. a gas sampling device; 100. a gas sampling system; 11. a main pipeline; 111. a channel; 12. a sampling pipeline; 121. an electrically controlled valve; 13. a sample outlet pipeline; 14. air washing the pipeline; 15. an air extraction pipeline; 20. a carrier gas storage device; 21. an electrically controlled valve; 30. a vacuum pumping device; 31. an electrically controlled valve; 40. a control device; 50. a gas sampling point; 60. a gas analysis device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It is to be noted that technical terms or scientific terms used herein should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs, unless otherwise defined.
In the related art, radioactive gases at different sampling points are introduced into a gas chromatography system for composition analysis, typically using a multi-way valve. In practical applications, the one-out-of-many valve of VICI and the one-out-of-many valve of AFP are usually selected for sampling at multiple sampling points. However, these one-out-of-one valves are expensive and have limitations in practical use. Specifically, for a valve with one more selection of the VICI, the conversion between different sampling points is realized mainly by the rotation of a ceramic rotor of a valve core part, the ceramic rotor is abraded during the rotation, and then the valve with the one more selection is leaked, so that the valve with the one more selection of the VICI is replaced after being used for two or three years; and because an electromagnetic valve needs to be additionally installed to drive the rotor to rotate, air is easily introduced into the valve core when the sampling point is replaced, so that the measurement result is inaccurate. For an AFP valve, the vacuum degree can not meet the requirement, and the AFP valve can only be applied to measurement of positive pressure gas and cannot be applied to measurement of negative pressure gas. However, because the tritium-containing gas is basically measured under negative pressure due to the particularity of the tritium-containing gas, the one-out-of-multiple valve of AFP is not suitable for sampling the tritium-containing gas. In addition, even if the measurement is carried out under positive pressure by using a valve with more than one AFP, when a sampling point is replaced, the gas circuit is easily polluted, so that the measurement result is inaccurate.
The present application has been made in view of the above problems.
FIG. 1 is a schematic diagram of a gas sampling assembly according to one embodiment of the present invention; FIG. 2 is a schematic cross-sectional view of a gas sampling assembly according to one embodiment of the present invention. As shown in fig. 1 and 2, a gas sampling apparatus 10 according to an embodiment of the present invention includes a main line 11, a plurality of sampling lines 12, and an outlet line 13.
The main pipe 11 internally defines a passage 111. Each of the sampling line 12 and the sample outlet line 13 is in direct communication with the channel 111. It will be readily understood by those skilled in the art that "direct communication" herein means that each of the sampling line 12 and the outlet line 13 is directly connected to the main line 11, rather than indirectly connected through another line.
Each sampling line 12 is used for receiving a sample gas, and the outlet line 13 is used for conveying the sample gas received by the sampling line 12 outwards.
With the gas sampling device 10 of the embodiment of the present application, since it has a plurality of sampling pipes 12, sampling from a plurality of different sampling points can be realized. Moreover, the structure of the embodiment of the present application enables the number of sampling pipelines 12 to be unlimited, and thus, the structure is particularly suitable for being applied to a scene with a large number of sampling points.
In addition, the gas sampling device 10 does not need to rotate the valve core when the sampling gas at different sampling points is replaced, so that air is not introduced when the sampling gas is replaced, and the phenomenon of air leakage caused by abrasion of the valve core is avoided. The gas sampling device 10 of the embodiment of the present application has the advantage of long service life because there is no wear problem of the rotating valve core.
Specifically, referring to fig. 3, each sampling line 12 may be connected to a corresponding one of the gas sampling points 50, whereby a plurality of sampling lines 12 may be connected to a plurality of gas sampling points 50. In the illustrated embodiment, the gas sampling assembly 10 is provided with 5 sampling lines 12. It will be readily appreciated that in embodiments not shown, the number of sampling lines 12 may be set according to the number of gas sampling points 50 to be measured, for example, the gas sampling device 10 may have 2, 3, 4, 6, 8, 11 sampling lines 12, etc.
The outlet line 13 may be connected to a sample inlet of the gas analysis device 60 so as to deliver the sample gas entering the channel 111 to the gas analysis device 60. In some embodiments, the gas analysis device 60 can be, for example, a gas chromatography system (or referred to as a gas chromatograph).
Further, the gas sampling device 10 may further include a gas path on-off device configured to: controllably conducting one of all sampling lines 12 to allow only one sampling line 12 to receive sample gas at a time; alternatively, each sampling line 12 is closed. In such an embodiment, the gas circuit on-off device controls to selectively conduct one sampling pipeline 12, and the gas sampling point 50 connected to the sampling pipeline 12 is conducted to the channel 111, so that the sample gas at the gas sampling point 50 flows into the channel 111, and then enters the gas analysis device 60 for analysis.
It will be readily understood by those skilled in the art that in the present embodiment, the gas circuit on-off device can only select one sampling line 12 from the plurality of sampling lines 12 to communicate with the channel 111 at a time, i.e. only allow the sample gas at one gas sampling point 50 to flow into the channel 111.
The air passage on-off device may include a plurality of electronic control valves 121, and each electronic control valve 121 is used for switching on and off one sampling pipeline 12. These electrically controlled valves 121 are together configured to controllably conduct one of all sampling lines 12. The electrically controlled valve 121 may be, for example, a solenoid valve.
Each electrically controlled valve 121 may be provided on one sampling line 12; either at the inlet of the sampling line 12 or at the connection between the sample sampling point 50 and the sampling line 12. Those skilled in the art will readily appreciate that the electrically controlled valve 121 may also be disposed at the sample sampling point 50, or on an intermediate line connecting the sample sampling point 50 with the sampling line 12.
Compared with a valve which is selected from more than one and is used in the related technology, the gas sampling device 10 which is composed of a plurality of pipelines has the advantage of no dead volume, thereby further avoiding the cross contamination of the gas introduced when the sampling point is replaced and improving the stability and the accuracy of the gas analysis.
In some embodiments, the gas sampling assembly 10 may further include a suction line 15, the suction line 15 also being in direct communication with the passageway 111. The suction line 15 can be connected directly to the evacuation device 30 or indirectly via a line to the evacuation device 30 in order to evacuate the channel 111 by means of the evacuation device 30. The evacuation device 30 may be a vacuum pump.
To the gas sampling device 10 of this application embodiment, owing to be provided with bleeder line 15 to on the one hand, can realize wasing passageway 111, take out the gas in passageway 111 through evacuating device 30 promptly, thereby make when switching on different sampling pipeline 12 in order to replace different gas sampling point 50, can prevent that the sampling gas from being polluted by the remaining sample gas of the past, prevent different gas circuit cross contamination promptly, influence measurement and analysis's accuracy. On the other hand, since the passage 111 communicates with the sample outlet pipe 13, the quantitative tube of the gas analyzer 60 connected to the sample inlet port can be evacuated through the evacuation pipe 15, and the inside of the quantitative tube is made to be a negative pressure, thereby sampling the sample gas in a negative pressure state.
In other embodiments, when it is desired to sample at positive pressure, the sample gas may be passed through one of the sampling lines 12, through the channel 111 directly into the gas analysis device 60.
Therefore, the gas sampling device 10 provided by the embodiment of the application can realize sample introduction of sample gas under positive and negative pressures, and is suitable for sampling various gases. The method is not only suitable for multi-point sampling of common gas (namely non-radioactive gas), but also suitable for multi-point sampling of radioactive gas.
In some embodiments, the gas sampling apparatus 10 may further comprise: a carrier gas line 14 in direct communication with the passageway 111 for providing a purge carrier gas to the passageway 111.
The carrier gas line 14 may be connected to a carrier gas storage 20, and the carrier gas storage 20 may supply purge carrier gas to the carrier gas line 14. In some embodiments, the carrier gas storage device 20 may be a carrier gas tank. The purge carrier gas may be selected according to the kind of the sample gas, and may be, for example, helium, neon, or the like.
It will be appreciated that in some embodiments, when a sample is taken at a gas sampling point 50, the carrier gas line 14 may be controlled to provide a purge carrier gas to the channel 111, which may carry residual sample gas within the channel 111 out of the channel 111, thereby performing a purge operation (or gas purge operation) on the channel 111. The carrier line 14 and the suction line 15 can cooperate with each other to clean the passage 111 more thoroughly. For example, the evacuation device 30 may first evacuate the gas path communicated with the channel 111 through the evacuation line 15, then introduce the purge carrier gas into the gas path communicated with the channel 111 through the gas supply line 14, and repeatedly and alternately perform multiple (e.g., 2 to 5) evacuation operations and purge operations, so as to clean the interior of the gas path communicated with the channel 111 without affecting the measurement result of the next sample gas.
In some embodiments, with reference to fig. 1, the suction line 15 and the sampling lines 12 are arranged along the axial direction of the main line 11, the axes of the suction line 15 and all the sampling lines 12 being in the same plane; and the suction line 15 is located on one radial side of the main line 11 and all the sampling lines 12 are located on the other radial side of the main line 11.
The sample discharge line 13 and the carrier gas line 14 may be provided on one axial side of the main line 11, respectively. The sampling line 12, the sample outlet line 13, the carrier gas line 14, and the suction line 15 all have the same inner diameter. The inner diameter of the sampling line 12 may be less than or equal to the inner diameter of the passage 111.
The main pipeline 11, the sampling pipeline 12, the sample outlet pipeline 13, the gas carrying pipeline 14 and the gas extraction pipeline 15 can be all stainless steel pipes so as to sample the radioactive gas tritium.
In some embodiments, the channel 111 of the main conduit 11 is electropolished by milling a through-hole in a stainless steel body. A plurality of through holes communicated with the through holes are milled on the stainless steel body, and the air suction pipeline 15 and each sampling pipeline 12 are respectively welded at different through holes of the stainless steel body; the sample outlet pipeline 13 and the gas carrying pipeline 14 are respectively welded at two ports of the through hole of the stainless steel body.
When gas sampling device 10 is used for taking a sample to radioactive gas tritium, the roughness of passageway 111 is less than 0.8um as far as possible, and the size of each pipeline will be as little as possible to reach the purpose that reduces tritium absorption, tritium and stay.
The following describes a method for manufacturing the gas sampling apparatus 10 according to an embodiment of the present application, with reference to the tritium-containing gas as the sampling gas. A316L stainless steel with the size of approximately 10X 100mm (the length of the stainless steel can be adjusted according to the number of the gas sampling points 50) is selected, and a through hole (i.e. the channel 111 of the main pipeline 11) with the diameter of about 0.75mm is milled in the 316L stainless steel along the length direction. The roughness of the through hole is less than 0.8um by the electrolytic polishing technology. A 1/16' stainless steel pipe is welded at one end of the through hole to form the gas carrying pipeline 14; a stainless steel pipe 1/16' is welded at the other end of the through hole to be used as a sample outlet pipeline 13; a plurality of 1/16 'through holes communicated with the through holes are milled on 316L stainless steel, and 1/16' stainless steel pipes are welded at each through hole to respectively serve as the suction pipeline 15 and the sampling pipeline 12. Then, each pipeline can be connected with the corresponding pipeline or interface by selecting a proper pipeline connection mode.
For the gas sampling device 10 of the above example, measurements showed that the vacuum level was 4.0E-5 Pa. Therefore, after the purging operation and the vacuumizing operation, the gas in the gas sampling device 10 can be ensured not to be cross-polluted when the sampling point is replaced.
Those skilled in the art will readily understand that the gas sampling device 10 of the above embodiment is applicable not only to tritium-containing gas, but also to other radioactive gases or common gases.
The embodiment of the application also provides a gas sampling system. Referring to fig. 3 and 4, a gas sampling system 100 includes: a gas sampling assembly 10 and a control assembly 40 as in any of the previous embodiments. The control device 40 is configured to: and controlling the gas path on-off device of the gas sampling device 10 to conduct the corresponding sampling pipeline 12 according to the received sampling instruction.
The control device 40 may be electrically connected to each of the electrically controlled valves 121 in the air passage switching device to control the opening or closing of each of the electrically controlled valves 121, so as to switch on or off the sampling pipeline 12 by controlling the opening or closing of the electrically controlled valves 121. Specifically, when the control device 40 controls one of the electronic control valves 121 to open, the sampling line 12 in which the electronic control valve 121 is located is conducted, and the sample gas at the gas sampling point 50 connected to the sampling line 12 flows into the channel 111 and then enters the gas analysis device 60 for analysis. When the control device 40 controls the electric control valve 121 to close, the sampling line 12 in which the electric control valve 121 is located is disconnected, and introduction of the sample gas from the gas sampling point 50 connected to the sampling line 12 is stopped. In some embodiments, when the gas sampling apparatus 10 has the pump line 15, the gas sampling system 100 further includes: and a vacuum device 30. The evacuation device 30 is connected to the evacuation line 15 of the gas sampling device 10 for controlled evacuation of the evacuation line 15. The vacuum pumping device 30 may be a vacuum pump, such as a mechanical pump and a molecular pump.
In some embodiments, when the gas sampling device 10 has a carrier gas line 14, the gas sampling system 100 can further include a carrier gas storage device 20 connected to the carrier gas line 14 of the gas sampling device 10 for controllably providing a purge carrier gas to the carrier gas line 14. The carrier gas storage device 20 may be, for example, a carrier gas tank.
The control device 40 may be electrically connected to the carrier gas storage device 20 and the vacuum pumping device 30 to control the carrier gas storage device 20 to provide the purge carrier gas to the carrier gas pipeline 14 and control the vacuum pumping device 30 to vacuum the pumping line 15. Specifically, the control device 40 may be electrically connected to the electronic control valve 21 of the carrier gas storage device 20 to control the opening or closing of the electronic control valve 21. When the control device 40 controls the electronic control valve 21 to be opened, the carrier gas storage device 20 supplies the purging carrier gas to the carrier gas pipeline 14; when the control device 40 controls the electronic control valve 21 to close, the carrier gas storage device 20 stops supplying the purge carrier gas to the carrier gas line 14. Accordingly, the control device 40 can also be electrically connected to the electronic control valve 31 of the vacuum device 30 to control the opening or closing of the electronic control valve 31. When the control device 40 controls the electric control valve 31 to be opened, the vacuumizing device 30 performs vacuumizing operation; when the control device 40 controls the electric control valve 31 to close, the vacuum-pumping device 30 stops the vacuum-pumping operation.
In some embodiments, the control device 40 may be further configured to: and controlling the gas path on-off device to disconnect all sampling pipelines 12 according to the received cleaning instruction, and starting the carrier gas storage device 20 and/or the vacuumizing device 30. It will be readily understood by those skilled in the art that references herein to opening the carrier gas storage 20 and opening the vacuum 30 are to be understood as opening the electrically controlled valve 21 of the carrier gas storage 20 and opening the electrically controlled valve 31 of the vacuum 30.
In some embodiments, after the control device 40 receives the purge command and disconnects all the sampling lines 12, the electronic control valve 21 of the carrier gas storage device 20 and the electronic control valve 31 of the vacuum device 30 may be opened simultaneously. At this time, the carrier gas stocker 20 may gradually supply a constant flow rate of purge carrier gas into the passage 111, and the evacuation device 30 may evacuate the gas passage communicating with the passage 111.
In other embodiments, after the control device 40 receives the cleaning instruction and disconnects all the sampling lines 12, the electronic control valve 21 of the carrier gas storage device 20 may be opened first, the purge carrier gas is introduced into the channel 111, then the carrier gas storage device 20 and the electronic control valve 21 are closed, and the electronic control valve 31 of the vacuum device 30 is opened, so as to evacuate the purge carrier gas and the residual sample gas in the channel 111 from the gas path connected to the channel 111.
In other embodiments, after the control device 40 receives the cleaning command and disconnects all the sampling lines 12, the electrically controlled valve 31 of the vacuum device 30 is opened to draw the sample gas remaining in the channel 111 out of the gas path connected to the channel 111; then the electric control valve 31 of the vacuumizing device 30 is closed, the electric control valve 21 of the carrier gas storage device 20 is opened, the purging carrier gas is introduced into the gas path connected with the channel 111, then the electric control valve 21 of the carrier gas storage device 20 is closed, the electric control valve 31 of the vacuumizing device 30 is opened, and the purging carrier gas and the residual sample gas in the gas path connected with the channel 111 are pumped away. In some embodiments, a purge command may be sent to the control device 40 after the gas analysis device 60 tests. That is, after the test of the gas analyzer 60 is completed, the control device 40 controls to open the electric control valve 31 of the vacuum extractor 30 and the electric control valve 21 of the carrier gas storage device 20 to clean the gas path connected to the passage 111.
In a further embodiment, the purging operation and the vacuum pumping operation may be repeated for a plurality of times on the gas path connected to the channel 111 to reduce the content of the sample gas inside the gas sampling apparatus 10 as much as possible without affecting the analysis and measurement of the sample gas.
In other embodiments, after the control device 40 receives the cleaning command and disconnects all the sampling lines 12, only the electronic control valve 31 of the vacuum pumping device 30 or only the electronic control valve 21 of the carrier gas storage device 20 may be opened, that is, only the gas path connected to the channel 111 is subjected to the vacuum pumping operation or only the gas path connected to the channel 111 is subjected to the purging operation during the whole cleaning process. Of course, in such an embodiment, the cleaning time is longer and less effective than the cleaning using both the evacuation device 30 and the carrier gas storage device 20.
The effects of the gas sampling device 10 according to the embodiment of the present application will be described below through specific experiments. In this measurement experiment, the high concentration H is first measured2A first sample gas of the component (the first sample gas is a gas containing 1000ppm H)2He) of the component), the low concentration H being measured2A second sample gas of the component (the second sample gas is a gas containing 10ppm of H)2He of component (a).
First, in the case where the gas analyzer 60 is in a test state (all gas paths are cleaned, and the detection result is the background of the instrument carrier gas), the sampling line 12 connected to the first sample gas is turned on, so that the first sample gas enters the channel 111 and enters the gas chromatograph for measurement. After the measurement is finished, the electric control valve 31 of the vacuumizing device 30 is opened to vacuumize the channel 111 and the quantitative tube of the gas chromatographic analyzer, then the electric control valve 21 of the carrier gas storage device 20 is opened to provide helium purging carrier gas for the channel 111 and the quantitative tube of the gas chromatographic analyzer, the gas path is subjected to gas washing, and the measurement result after the vacuumizing and gas washing operations of the channel 111 are repeated three times shows that the gas in the cleaned channel 111 is close to the background value of the instrument carrier gas. Then, the sampling line 12 connected to the second sample gas is turned on, so that the second sample gas enters the channel 111 and enters the gas chromatograph for measurement. The measurement results show that the hydrogen component at a low concentration in the second sample gas can be accurately measured without being affected by the first sample gas.
Therefore, after the sampling point is replaced, the gas sampling device 10 and the gas sampling system 100 of the embodiment of the application can utilize the purging carrier gas and the vacuum pumping device 30 to completely replace and clean the channel 111, so that the gas cross contamination when the sampling point is replaced is avoided, and the accuracy of the sample gas measurement is improved.
In addition, the gas in the gas circuit approaches to the helium background value by repeatedly and alternately cleaning the gas circuit for three times, so that the aim of quick replacement cleaning can be fulfilled, and the gas-saving and time-saving device has the advantages of time saving and gas saving.
It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (20)
1. A gas sampling device, comprising:
a main line (11) internally defining a passage (111);
a plurality of sampling lines (12) for receiving sample gas, each of said sampling lines (12) being in direct communication with said channel (111); and
a sample outlet line (13) in direct communication with the channel (111) for conveying the sample gas received by the sampling line (12) outwardly.
2. The gas sampling device of claim 1, further comprising: the gas circuit on-off device is configured to: controllably conducting one of the plurality of sampling lines (12) to allow only one sampling line (12) to receive sample gas at a time; alternatively, each of the sampling lines (12) is closed.
3. A gas sampling device according to claim 2, characterized in that said pneumatic on-off means comprises a plurality of electrically controlled valves (121), each of said electrically controlled valves (121) being adapted to control the on-off of one of said sampling lines (12).
4. The gas sampling device of claim 1, further comprising: an extraction line (15) in direct communication with the passage (111).
5. A gas sampling device according to claim 4, characterized in that the suction line (15) and the plurality of sampling lines (12) are arranged in the axial direction of the main line (11).
6. The gas sampling device according to claim 5,
the axes of the air suction pipeline (15) and all the sampling pipelines (12) are in the same plane.
7. A gas sampling device according to claim 6, characterized in that the suction line (15) is located on one radial side of the main line (11) and all sampling lines (12) are located on the other radial side of the main line (11).
8. The gas sampling device of claim 4, further comprising: a carrier gas line (14) in direct communication with the channel (111) for providing a purge carrier gas to the channel (111).
9. A gas sampling device according to claim 8, characterized in that the outlet line (13) and the carrier gas line (14) are each arranged on one axial side of the main line (11).
10. Gas sampling device according to claim 8, characterized in that the internal diameters of the sampling line (12), the outlet line (13), the carrier gas line (14) and the suction line (15) are all the same.
11. A gas sampling device according to claim 10, characterized in that the inner diameter of the sampling line (12) is equal to or less than the inner diameter of the passage (111).
12. The gas sampling device according to claim 8, characterized in that the main line (11), the sampling line (12), the outlet line (13), the carrier gas line (14) and the suction line (15) are all stainless steel tubes.
13. A gas sampling device according to claim 12, characterized in that the channel (111) of the main line (11) is electropolished by through-going holes milled in a stainless steel body.
14. A gas sampling device according to claim 13 wherein the stainless steel body is further milled with a plurality of through holes communicating with the through holes,
the air suction pipeline (15) and each sampling pipeline (12) are respectively welded at different through holes of the stainless steel body.
15. A gas sampling device according to claim 13, wherein the sample outlet line (13) and the gas-carrying line (14) are welded at respective ports of the through-going bore of the stainless steel body.
16. The gas sampling device according to claim 1, wherein the roughness of the channels (111) is less than 0.8 um.
17. A gas sampling system, comprising:
the gas sampling device (10) according to any one of claims 2 to 16; and
a control device (40) configured to: and controlling the gas path on-off device of the gas sampling device (10) to conduct the corresponding sampling pipeline (12) according to the received sampling instruction.
18. The gas sampling system of claim 17, further comprising: and the vacuumizing device (30) is connected with the air pumping pipeline (15) of the gas sampling device (10) and is used for controllably vacuumizing the air pumping pipeline (15).
19. The gas sampling system of claim 18, further comprising: and the carrier gas storage device (20) is connected with the carrier gas pipeline (14) of the gas sampling device (10) and is used for controllably providing the purging carrier gas for the carrier gas pipeline (14).
20. The gas sampling system of claim 19,
the control device (40) is further configured to: and controlling the gas path on-off device to disconnect all the sampling pipelines (12) according to the received cleaning instruction, and starting the carrier gas storage device (20) and/or the vacuumizing device (30).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114509518A (en) * | 2022-02-21 | 2022-05-17 | 淮北工科检测检验有限公司 | Oil-gas chromatography rapid measuring device based on large transformer |
| CN115015442A (en) * | 2022-07-19 | 2022-09-06 | 国网安徽省电力有限公司电力科学研究院 | Laboratory gas chromatograph calibration device and method based on gradient oil sample calibration method |
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