CN117531333B - Filtering system of gas chromatograph in krypton-xenon detection - Google Patents
Filtering system of gas chromatograph in krypton-xenon detection Download PDFInfo
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- CN117531333B CN117531333B CN202410024695.0A CN202410024695A CN117531333B CN 117531333 B CN117531333 B CN 117531333B CN 202410024695 A CN202410024695 A CN 202410024695A CN 117531333 B CN117531333 B CN 117531333B
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- 238000001914 filtration Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 title claims abstract description 24
- PDEXVOWZLSWEJB-UHFFFAOYSA-N krypton xenon Chemical compound [Kr].[Xe] PDEXVOWZLSWEJB-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000012216 screening Methods 0.000 claims abstract description 66
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000007789 gas Substances 0.000 claims abstract description 48
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 24
- 238000003795 desorption Methods 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 55
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 238000007873 sieving Methods 0.000 claims description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 8
- 239000002808 molecular sieve Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 229910052743 krypton Inorganic materials 0.000 abstract description 13
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052724 xenon Inorganic materials 0.000 abstract description 13
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 abstract description 13
- 239000012535 impurity Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 239000004964 aerogel Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000010926 purge Methods 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/266—Drying gases or vapours by filtration
-
- 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
- G01N30/06—Preparation
- G01N30/08—Preparation using an enricher
-
- 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
- G01N30/06—Preparation
- G01N30/14—Preparation by elimination of some components
Abstract
The invention relates to the technical field of krypton-xenon detection, and in particular discloses a filtering system of a gas chromatograph in krypton-xenon detection, which comprises the following components: the device comprises a gas capturing component, a three-way valve, a pressurizing component, a nitrogen desorption component, a screening component and a filtering component; the gas capturing component, the nitrogen desorption component and the screening component are respectively connected through a three-way valve, and the pressurizing component is connected with a pressurizing channel arranged on the three-way valve; according to the method, after the experimental air is captured and enriched by primary air to form the experimental air flow, the experimental air flow is subjected to secondary enrichment and filtration before the enriched experimental air flow containing krypton and xenon is input into the sample injection device, so that on one hand, the concentration of the krypton and xenon contained in the enriched experimental air flow is increased, and on the other hand, aerogel, water vapor and particulate impurities in the experimental air flow can be effectively removed.
Description
Technical Field
The invention relates to the technical field of krypton-xenon detection, in particular to a filtering system of a gas chromatograph in krypton-xenon detection.
Background
When monitoring radioactive elements, the conventional method at present comprises the steps of firstly capturing and enriching gas through an atmospheric capturing device, directly inputting the gas into a sample injection device after enrichment, and then inputting the gas into a sample ring for detection through the sample injection device.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a filtration system for a gas chromatograph in krypton-xenon detection.
To achieve the above object, the present invention provides a filtration system for a gas chromatograph in krypton-xenon detection, comprising: the device comprises a gas capturing component, a three-way valve, a pressurizing component, a nitrogen desorption component, a screening component and a filtering component; the gas capturing component, the nitrogen desorption component and the screening component are respectively connected through a three-way valve, and the pressurizing component is connected with a pressurizing channel arranged on the three-way valve;
the screen assembly includes: the screening device comprises a screening shell, wherein a screening space is formed in the screening shell, an air inlet valve, an air outlet valve, a right screening valve, a left screening valve and an air outlet valve which are communicated with the screening space are arranged on the screening shell, a sealing shaft is arranged in the screening shell and is used for partially filling the screening space, and the upper part of the sealing shaft is driven to rotate through a driving component arranged in the screening shell;
the filter assembly includes: the pipe body is round and is provided with an inner pipe and a lead pipe which is arranged outside the inner pipe and used for shielding gas to prevent leakage, a plurality of separation grids which are uniformly arranged are arranged inside the inner pipe, an airflow channel is formed between the adjacent separation grids, and a carbon molecular sieve is arranged in the airflow channel;
the two ends of the pipe body are respectively provided with a left joint and a right joint, the left joint is connected with a left screening valve, and the right joint is connected with a right screening valve.
Further, the gas capturing component is used for capturing and enriching the air in the detection space and storing the enriched air in the storage tank; wherein the gas capture assembly has:
the storage tank is used for storing the enriched air to form an experimental air flow;
and one end of the conveying pipeline is connected with the storage tank, and the other end of the conveying pipeline is connected with a first joint on the three-way valve.
Further, the pressurizing assembly includes:
the pressurizing pump is connected with a pressurizing pipeline of the pressurizing pump, the pressurizing pipeline is connected with a pressurizing channel arranged on the three-way valve, a control valve is arranged between the pressurizing pipeline and the pressurizing channel, the pressurizing pump takes nitrogen as a driving air source, and the pressurizing pipeline, the second control valve and the pressurizing channel are used for pressurizing experimental air flow input into the air inlet valve.
Further, the nitrogen desorption assembly comprises:
the nitrogen gas bottle, sweep pipeline and set up the air-vent valve on sweeping the pipeline, sweep pipeline one end and terminate on the nitrogen gas bottle, the other end inserts to the three-way valve on sweep the joint.
Further, a chute for rotating the sealing shaft is formed along the inner wall of the screening shell;
a first steel beam and a second steel beam which are circularly distributed are arranged on the upper half part of the screening space and along the inner wall of the screening shell, a rotating groove is formed between the first steel beam and the second steel beam, and a sealing groove is formed above the second steel beam and between the second steel beam and the top cover of the screening shell;
a through hole for arranging the rotating shaft is formed in the middle part of the top cover, and a rotating shaft sealing groove is formed in the through hole towards the side surfaces of the top covers at the two sides;
the driving assembly comprises a rotating shaft, a sealing strip is arranged on the upper half part of the rotating shaft and along the periphery of the rotating shaft, and the sealing strip is arranged in a sealing groove of the rotating shaft; a shaft body sealing groove is arranged at the lower part of the sealing strip and along the peripheral side of the rotating shaft, and a plurality of overlapped sealing sheets are arranged between the shaft body sealing groove and the sealing groove;
the rotating wheel is circumferentially provided with a sliding block which is integrally arranged with the rotating wheel, the sliding block is matched with the rotating groove, a shaft seat is arranged at the middle part of the rotating wheel, and the bottom of the rotating shaft is fixed in the shaft seat.
Further, the pressurizing channel is formed by the side end of the three-way valve shell, and the pressurizing channel is communicated with the outlet end of the valve body arranged on the three-way valve.
Further, a lower groove body and an upper groove body are respectively formed on the upper surface of the first steel beam and the lower surface of the second steel beam, and an upper groove and a lower groove are respectively and correspondingly formed on the upper part and the lower part of the sliding block; the lower groove corresponds to the lower groove body, and a plurality of balls are filled between the lower groove and the lower groove body; the upper groove corresponds to the upper groove body, and a plurality of balls are filled between the upper groove and the upper groove body.
Further, the upper part of the rotating shaft is connected with a motor shaft of the motor through a coupler.
Further, the gas outlet valve inputs the gas containing krypton and xenon which is filtered and enriched by the filtering component into the sample injection device through the exhaust pipeline.
Further, a third control valve is arranged on the exhaust pipe.
According to the method, after the experimental air is captured and enriched by primary air to form the experimental air flow, the experimental air flow is subjected to secondary enrichment and filtration before the enriched experimental air flow containing krypton and xenon is input into the sample injection device, so that on one hand, the concentration of the krypton and xenon contained in the enriched experimental air flow is increased, and on the other hand, aerogel, water vapor and particulate impurities in the experimental air flow can be effectively removed.
Drawings
FIG. 1 is a schematic diagram of a system architecture of the present invention;
FIG. 2 is a schematic diagram of a filter assembly according to the present invention;
FIG. 3 is a schematic view of a screen assembly of the present application;
FIG. 4 is a schematic view of the structure of the sieving housing of the present application;
list of reference numerals: 1. a storage tank; 10. a delivery line; 11. a first control valve; 2. a filter assembly; 20. a left joint; 21. a right joint; 22. a carbon molecular sieve; 23. a separation grid; 24. an air flow channel; 25. a lead pipe; 26. an inner tube; 3. a screen assembly; 30. an intake valve; 31. a right screen valve; 32. a left screen valve; 33. an air outlet valve; 34. sealing the shaft; 35. an exhaust valve; 300. a sieving housing; 301. a rotating shaft seal groove; 302. a through hole; 303. a first steel beam; 304. a second steel beam; 305. sealing grooves; 306. a rotating groove; 4. a nitrogen cylinder; 40. purging the pipeline; 41. a pressure regulating valve; 5. a pressurizing pump; 50. a second control valve; 51. a pressurizing pipeline; 6. a sample introduction device; 60. an exhaust line; 61. a third control valve; 7. a motor; 70. a rotating shaft; 71. a sealing strip; 72. a shaft body sealing groove; 73. a sealing sheet; 74. a shaft seat; 75. a rotating wheel; 76. a slide block; 8. a three-way valve; 80. a pressurizing passage; 81. purging the joint; 82. a first joint.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 4, to achieve the above object, the present invention provides a filtration system for a gas chromatograph in krypton-xenon detection, comprising: the device comprises a gas capturing component, a three-way valve 8, a pressurizing component, a nitrogen desorption component, a screening component 3 and a filtering component 2; the gas capturing component, the nitrogen desorption component and the screening component 3 are respectively connected through a three-way valve 8, and the pressurizing component is connected with a pressurizing channel 80 arranged on the three-way valve 8; the screen assembly 3 comprises: the screening device comprises a screening shell 300, wherein a screening space is formed in the screening shell 300, an air inlet valve 30, an air outlet valve 33, a right screening valve 31, a left screening valve 32 and an air outlet valve 35 which are communicated with the screening space are arranged on the screening shell, a sealing shaft 34 is arranged in the screening shell 300, the sealing shaft 34 is used for filling the screening space, the filled volume is not less than one third of the screening space and not more than one half of the screening space, and the upper part of the sealing shaft 34 is driven to rotate by a driving component arranged in the screening shell 300; the filter assembly 2 comprises: the gas-tight pipe comprises a circular pipe body with two open ends, wherein the pipe body is provided with an inner pipe 26 and a lead pipe 25 which is arranged outside the inner pipe 26 and is used for shielding gas to prevent leakage, a plurality of uniformly arranged separation grids 23 are arranged inside the inner pipe, gas flow channels 24 are formed between the adjacent separation grids 23, and carbon molecular sieves 22 are arranged in the gas flow channels 24; a left joint 20 and a right joint 21 are respectively arranged at two ends of the pipe body, the left joint 20 is connected with a left screening valve 32, and the right joint 21 is connected with a right screening valve 31.
In the above, the sealing shaft 34 is formed in a fan shape, and the fan-shaped angle thereof is 160 °, so that the sealing shaft 34 can be well attached to the inner wall of the screening space, wherein the screening space is used as a transit passage for experimental air flow, therefore, the sealing shaft is used for performing secondary sealing when the passage between the air inlet and the air outlet is switched, and the sealing shaft 34 is filled, so that the volume of the screening space is reduced as much as possible, and the experimental air flow in the screening space is reduced as much as possible, so as to ensure that impurities in finally obtained krypton and xenon are reduced as much as possible.
In the above, the gas capturing assembly is used for capturing and enriching the air in the detection space, and storing the enriched air in the storage tank 1; wherein the gas capture assembly has: a storage tank 1 for storing enriched air to form an experimental air flow; and a delivery pipe 10 and a first control valve 11 provided on the delivery pipe 10, one end of the delivery pipe 10 being connected to the storage tank 1, and the other end being connected to a first joint 82 on the three-way valve 8.
In the above, the pressurizing assembly includes: the pressurization pump 5, connect the pressurization pipeline 51 of the pressurization pump 5, the said pressurization pipeline 51 is connected with pressurization channel 80 set up on the three-way valve 8, there is control valve between said pressurization pipeline 51 and pressurization channel 80, the said pressurization pump 5 uses nitrogen as the driving air source, through pressurization pipeline 51, second control valve 50, pressurization channel 80 to input into the experiment air current in the air inlet valve 30 to pressurize.
Further, the nitrogen desorption assembly comprises: the nitrogen bottle 4, purge line 40 and set up the air-vent valve 41 on purge line 40, purge line 40 one end is connected on nitrogen bottle 4, the other end is connected to the purge joint 81 on the three-way valve 8.
Further, a chute for rotating the sealing shaft 34 is provided along the inner wall of the sieving housing 300; a first steel beam 303 and a second steel beam 304 which are circularly arranged are arranged on the upper half part of the screening space and along the inner wall of the screening shell 300, a rotating groove 306 is formed between the first steel beam 303 and the second steel beam 304, and a sealing groove 305 is formed above the second steel beam 304 and between the second steel beam 304 and the top cover of the screening shell 300; a through hole 302 for arranging the rotating shaft 70 is arranged in the middle part of the top cover, and a rotating shaft sealing groove 301 is arranged at the through hole 302 towards the side surfaces of the top covers at the two sides; the driving assembly comprises a rotating shaft 70, a sealing strip 71 is arranged on the upper half part of the rotating shaft 70 and along the circumferential side of the rotating shaft 70, and the sealing strip 71 is arranged in a rotating shaft sealing groove 301; a shaft body sealing groove 72 is arranged at the lower part of the sealing strip 71 and along the peripheral side of the rotating shaft 70, a plurality of overlapped sealing sheets 73 are arranged between the shaft body sealing groove 72 and the sealing groove 305, a rotating wheel 75 is arranged in the circumferential direction of the rotating wheel 75, a sliding block 76 which is integrally arranged with the rotating wheel 75 is arranged on the circumference of the rotating wheel 75, the sliding block 76 is matched with the rotating groove 306 for installation, a shaft seat 74 is arranged at the middle part of the rotating wheel 75, and the bottom of the rotating shaft 70 is fixed in the shaft seat 74, wherein the shaft seat 74 is fixed with the rotating wheel 75; the rotating wheel 75 is connected to the seal shaft 34.
In some embodiments, a lower groove body and an upper groove body are respectively formed on the upper surface of the first steel beam 303 and the lower surface of the second steel beam 304, and an upper groove and a lower groove are respectively and correspondingly formed on the upper portion and the lower portion of the sliding block 76; the lower groove corresponds to the lower groove body, and a plurality of balls are filled between the lower groove and the lower groove body; the upper groove corresponds to the upper groove body, and a plurality of balls are filled between the upper groove and the upper groove body. In the same manner, the seal strip 71 and the shaft seal groove 72 may be provided in the same manner as the above-described slider design.
In some embodiments, the screen housing 300 of the present application is not integrally formed, but rather is welded to two symmetrical structures, which facilitates the machining of the internal structure and assembly of the components when the shaft is assembled.
In some embodiments, the sealing sheet 73 is formed by stacking a plurality of rubber gaskets.
Further, the pressurizing channel 80 is formed by a side end of the casing of the three-way valve 8, and the pressurizing channel 80 is communicated with an outlet end of a valve body arranged on the three-way valve 8.
Further, the upper part of the rotating shaft 70 is connected with the motor shaft of the motor through a coupling.
Further, the gas outlet valve 33 inputs the krypton-containing and xenon-containing gas filtered and enriched by the filter assembly 2 into the sample injection device 6 through the exhaust pipeline 60.
Further, a third control valve 61 is provided on the exhaust pipe 60.
The principle of the application is as follows:
the gas capturing component is used for capturing and enriching air in the detection space and storing the enriched air in the storage tank 1; wherein the storage tank 1 is used for storing enriched air to form an experimental air flow; starting the motor 7, wherein the motor 7 drives the rotating shaft 70 to rotate, and the rotating shaft 70 is fixed with the shaft seat 74, so that the rotating shaft 70 drives the shaft seat 74 to rotate, and the shaft seat 74 is fixed with the rotating wheel 75, so that the shaft seat 74 rotates to drive the rotating wheel 75, and in order to enable the rotating wheel 75 to rotate more smoothly, a lower groove body and an upper groove body are respectively formed on the upper surface of the first steel beam 303 and the lower surface of the second steel beam 304, and an upper groove and a lower groove are respectively correspondingly formed on the upper part and the lower part of the sliding block 76; the lower groove corresponds to the lower groove body, and a plurality of balls are filled between the lower groove and the lower groove body; the upper groove corresponds to the upper groove body, and a plurality of balls are filled between the upper groove and the upper groove body; the sliding block 76 rotates smoothly through the action of the balls when rotating, so that the rotating groove 306 between the first steel beam 303 and the second steel beam 304 rotates smoothly, the rotating shaft 70 rotates to rotate the sealing shaft 34 along the screening space and at least to seal one side of the air outlet valve 33; the air inlet valve 30 and the right sieving valve 31 are opened, the air outlet valve 35, the air outlet valve 33 and the left sieving valve 32 are respectively closed, the conveying pipeline 10 between the air capturing component and the air inlet valve 30 is opened through the three-way valve 8, the pipelines between the pressurizing component, the nitrogen desorption component and the three-way valve 8 are closed, the experimental air stored in the storage tank 1 flows through the three-way valve 8 and the air inlet valve 30 to enter a sieving space, then enters the filtering component 2 through the sieving space and the right sieving valve 31, the captured air is adsorbed by the carbon molecular sieve 22 arranged in the air flow channel 24, in the adsorption process, the second control valve 50 can be opened according to actual requirements, the pressurizing pump 5 takes nitrogen as a driving air source (the temperature of the nitrogen output by the pressurizing pump 5 is between 50 ℃ below zero and 25 ℃ and the pressure of 100 Kpa), and the experimental air flow input into the air inlet valve 30 is pressurized through the pressurizing pipeline 51, the second control valve 50 and the pressurizing channel 80; the purpose of pressurization is that when activated carbon is taken as a molecular sieve, the adsorption capacity of the activated carbon for adsorbing krypton and xenon is enhanced along with the pressure rise, when the activated carbon is adsorbed to a certain degree, the pressurizing pump 5 and the second control valve 50 are closed, the exhaust valve 35 is opened, the driving motor 7 rotates the rotating shaft 70, the sealing shaft 34 keeps sealing one side of the air outlet valve 33, the left sieving valve 32 and the right sieving valve 31 are left (the left sieving valve 32 and the right sieving valve 31 are symmetrically arranged, the center of the sieving shell 300 is taken as a central axis, the plane angle formed by the left sieving valve 32 and the right sieving valve 31 to the central axis is smaller than 160 DEG, the plane angle formed by the air outlet valve 33 and the left sieving valve 32 to the central axis is larger than 100 DEG), the left sieving valve 32 and the exhaust valve 35 are opened, so that the left sieving valve 32 and the right sieving valve 31 at two ends of the filtering assembly form a passage with a sieving space, gas which cannot be adsorbed in the filtering assembly is discharged to the sieving space through the left sieving valve 32 and is discharged through the exhaust valve 35 on the sieving space, and the right sieving valve 31 can be closed according to actual needs in the exhaust process.
During desorption, the exhaust valve 35 is closed, the pressure regulating valve 41 is opened, the pressure regulating valve 41 is regulated, the switch valve on the nitrogen cylinder 4 is opened, nitrogen with the temperature of 35 ℃ and the pressure of 130-150Kpa is introduced into the screening space through the purging pipeline 40 and the pressure regulating valve 41, under the purging action of the nitrogen, krypton and xenon are desorbed from the carbon molecular sieve 22, adsorbed water vapor and particulate impurities can not be desorbed during desorption (the majority of aerogel can not be adsorbed and discharged), so that the aim of filtration is achieved, krypton and xenon in experimental airflow are secondarily enriched, after desorption is carried out for a period of time, the switch valves on the air inlet valve 30, the pressure regulating valve 41 and the nitrogen cylinder 4 are closed, the motor 7 is started, the rotating shaft 70 is driven to rotate by the motor 7, one side of the air inlet valve 30 is sealed by the rotating shaft 70, the air outlet valve 33 is left, the right screening valve 31 and the left screening valve 32 are kept open, and the experimental airflow containing the enriched and filtered krypton and xenon is input into the sample injection device 6.
According to the method, after the experimental air is captured and enriched by primary air to form the experimental air flow, the experimental air flow is subjected to secondary enrichment and filtration before the enriched experimental air flow containing krypton and xenon is input into the sample injection device 6, so that on one hand, the concentration of the krypton and xenon contained in the enriched experimental air flow is increased, and on the other hand, aerogel, water vapor and particulate impurities in the experimental air flow can be effectively removed.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A filtration system for a gas chromatograph in the detection of krypton-xenon, comprising:
the device comprises a gas capturing component, a three-way valve (8), a pressurizing component, a nitrogen desorption component, a screening component (3) and a filtering component (2); the gas capturing component, the nitrogen desorption component and the screening component (3) are respectively connected through a three-way valve (8), and the pressurizing component is connected with a pressurizing channel (80) arranged on the three-way valve (8);
the screen assembly (3) comprises: a screening housing (300), wherein a screening space is formed in the screening housing (300), an air inlet valve (30), an air outlet valve (33), a right screening valve (31), a left screening valve (32) and an air outlet valve (35) which are communicated with the screening space are arranged on the screening housing, a sealing shaft (34) is arranged in the screening housing (300), the sealing shaft (34) is used for partially filling the screening space, and the upper part of the sealing shaft (34) is driven to rotate by a driving component arranged in the screening housing (300);
the filter assembly (2) comprises: the gas-tight pipe comprises a pipe body which is round and is open at two ends, wherein the pipe body is provided with an inner pipe (26) and a lead pipe (25) which is arranged outside the inner pipe (26) and is used for shielding gas to prevent leakage, a plurality of uniformly arranged separation grids (23) are arranged inside the inner pipe (26), gas flow channels (24) are formed between the adjacent separation grids (23), and carbon molecular sieves (22) are arranged in the gas flow channels (24);
the two ends of the pipe body are respectively provided with a left joint (20) and a right joint (21), the left joint (20) is connected with a left screening valve (32), and the right joint (21) is connected with a right screening valve (31).
2. The filtration system of a gas chromatograph in krypton-xenon detection according to claim 1, wherein the gas capturing assembly is adapted to capture and enrich air in the detection space and store the enriched air in a storage tank (1); wherein the gas capture assembly has:
a storage tank (1) for storing enriched air to form an experimental air flow;
and a conveying pipeline (10) and a first control valve (11) arranged on the conveying pipeline (10), wherein one end of the conveying pipeline (10) is connected with the storage tank (1), and the other end of the conveying pipeline is connected with a first joint (82) on the three-way valve (8).
3. The gas chromatograph filtration system in krypton-xenon detection of claim 1, wherein the pressurization assembly comprises:
the pressurizing pump (5) is connected with a pressurizing pipeline (51) of the pressurizing pump (5), the pressurizing pipeline (51) is connected with a pressurizing channel (80) arranged on the three-way valve (8), a second control valve (50) is arranged between the pressurizing pipeline (51) and the pressurizing channel (80), and the pressurizing pump uses nitrogen as a driving air source and pressurizes an experimental air flow input into the air inlet valve (30) through the pressurizing pipeline (51), the second control valve (50) and the pressurizing channel (80).
4. The gas chromatograph filtration system in krypton-xenon detection of claim 1, wherein the nitrogen desorption assembly comprises:
the nitrogen gas bottle (4), sweep pipeline (40) and set up on sweeping pipeline (40) air-vent valve (41), sweep pipeline (40) one end and terminate on nitrogen gas bottle (4), the other end inserts on sweeping joint (81) on three-way valve (8).
5. The gas chromatograph filtering system in krypton-xenon detection according to claim 1, characterized in that a chute for the rotation of the sealing shaft (34) is provided along the inner wall of the sieving housing (300);
a first steel beam (303) and a second steel beam (304) which are circularly arranged are arranged on the upper half part of the screening space and along the inner wall of the screening shell (300), a rotating groove (306) is formed between the first steel beam (303) and the second steel beam (304), and a sealing groove (305) is formed above the second steel beam (304) and between the second steel beam and the top cover of the screening shell (300);
a through hole (302) for arranging the rotating shaft (70) is formed in the middle of the top cover, and a rotating shaft sealing groove (301) is formed in the through hole (302) towards the side surfaces of the top covers at the two sides;
the driving assembly comprises a rotating shaft (70), a sealing strip (71) is arranged on the upper half part of the rotating shaft (70) and along the periphery of the rotating shaft (70), and the sealing strip (71) is arranged in a rotating shaft sealing groove (301); a shaft body sealing groove (72) is arranged at the lower part of the sealing strip (71) along the peripheral side of the rotating shaft (70), and a plurality of overlapped sealing sheets (73) are arranged between the shaft body sealing groove (72) and the sealing groove (305);
the rotating wheel (75), the circumference of the rotating wheel (75) is provided with a sliding block (76) which is integrally arranged with the rotating wheel (75), the sliding block (76) is matched with the rotating groove (306), the middle part of the rotating wheel (75) is provided with a shaft seat (74), and the bottom of the rotating shaft (70) is fixed in the shaft seat (74);
wherein the shaft seat (74) is fixed with the rotating wheel (75).
6. The filtration system of the gas chromatograph in krypton-xenon detection according to claim 1, wherein the pressurizing channel (80) is opened by a side end of a casing of the three-way valve (8), and the pressurizing channel (80) is communicated with an outlet end of a valve body provided on the three-way valve (8).
7. The filtering system of the gas chromatograph in krypton-xenon detection according to claim 5, wherein a lower groove body and an upper groove body are respectively formed on the upper surface of the first steel beam (303) and the lower surface of the second steel beam (304), and an upper groove and a lower groove are respectively and correspondingly formed on the upper part and the lower part of the slide block (76);
the lower groove corresponds to the lower groove body, and a plurality of balls are filled between the lower groove and the lower groove body;
the upper groove corresponds to the upper groove body, and a plurality of balls are filled between the upper groove and the upper groove body.
8. The filtration system of a gas chromatograph in krypton-xenon detection according to claim 5, wherein the upper part of the rotating shaft (70) is connected to the motor shaft of the motor by a coupling.
9. The filtering system of the gas chromatograph in krypton-xenon detection according to claim 1, wherein the gas outlet valve (33) inputs the krypton-xenon-containing gas filtered and enriched by the filtering component (2) into the sample injection device (6) through the exhaust pipeline (60).
10. The gas chromatograph filtering system in krypton-xenon detection according to claim 9, characterized in that a third control valve (61) is arranged on the exhaust line (60).
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| CN202410024695.0A CN117531333B (en) | 2024-01-08 | 2024-01-08 | Filtering system of gas chromatograph in krypton-xenon detection |
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|---|---|
| CN117531333A (en) | 2024-02-09 |
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