CN104764862B - A kind of gas concentration on-the-spot test method - Google Patents
A kind of gas concentration on-the-spot test method Download PDFInfo
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- CN104764862B CN104764862B CN201510223501.0A CN201510223501A CN104764862B CN 104764862 B CN104764862 B CN 104764862B CN 201510223501 A CN201510223501 A CN 201510223501A CN 104764862 B CN104764862 B CN 104764862B
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- gas
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- 238000010998 test method Methods 0.000 title claims abstract description 8
- 239000007789 gas Substances 0.000 claims abstract description 59
- 238000012360 testing method Methods 0.000 claims abstract description 49
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000005070 sampling Methods 0.000 claims abstract description 34
- 229910052786 argon Inorganic materials 0.000 claims abstract description 20
- 230000006698 induction Effects 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 3
- 239000000523 sample Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 6
- 239000012855 volatile organic compound Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of gas concentration on-the-spot test method, solve the on-the-spot test problem of the rigid container internal gas concentration using screw plug to seal.Flexibility is sampled the fully wrapped around container ends in storehouse by the present invention, and internal filling lute is also fixed with band；The internal preset screw rod in sampling storehouse also introduces three gas conduits, and suction catheters connects Pressure gauge and vacuum pump, and air induction conduit is connected with argon by effusion meter, and test conduit connects gas tester；Volume calibration is carried out by evacuation, applying argon gas before Ce Shi；Utilizing screw rod to open screw plug, gas enters sampling storehouse and completes test by gas detector；Gas concentration within container is calculated by sampling storehouse calibrated volumes and container internal volume.The present invention is applicable for use with the on-the-spot test of the rigid container internal gas that screw plug seals.
Description
Technical field
The present invention relates to analyze field tests, particularly relate to a kind of gas concentration on-the-spot test method.
Background technology
Some armament systems would generally be filled with noble gas and use screw plug close during producing assembling
Envelope to ensure safety, along with the increase of equipment active time and transporting, environmental factors in storage process
Impact, it may occur however that the phenomenons such as warhead caulking gum burn into is aging, cause internal charge self volatilization,
Decompose produced gas to be diffused in the cavity of whole equipment, cause weapons and ammunitions to lose efficacy and jeopardize storehouse and
Personal security.
For the test of hermetic container internal gas concentration, the method generally used be utilize gas sampling bag or
After sampling probe extracts a certain amount of gaseous sample inside container, recycling instrument is analyzed detection.But,
This method is only applicable to those and has special sample connection or the appearance sealed with flexible materials such as rubber stoppers
Device.For the rigidity hermetic container using screw plug to seal, if directly opening screw plug sampling, container internal gas
Being exposed in open environment, gas exchange will certainly occur, the gas gathered cannot reaction vessel interior
Time of day, produces impact to test result；Additionally, survey again after utilizing sampler bag or sampling probe sampling
Examination, sample is through a transfer process, it is also possible to because state changes brings error.Therefore, how close
Complete sampling and on-the-spot test under the conditions of envelope simultaneously, be to solve this type of container internal gas concentration determination problem
Crucial.At present, for the on-the-spot test of the container internal gas concentration using screw plug to seal, the most it is not correlated with
Technology report.
Summary of the invention
The invention provides a kind of gas concentration on-the-spot test method, may be used for detection and use screw plug to seal
Rigid container internal gas concentration.For reaching above-mentioned purpose, the present invention adopts the following technical scheme that realization:
Utilizing the fully wrapped around container ends in flexibility sampling storehouse, internal filling lute is also fixed with band；Take
The internal preset screw rod in sample storehouse also introduces gas conduit, is discharged by vacuum pump and sample air in storehouse during test, and
Quantitatively it is passed through argon and carries out volume calibration, after opening screw plug, read data, gas concentration by gas tester
Can be calculated by sampling storehouse calibrated volumes and container internal volume.
Concrete method of testing comprises the following steps:
(1) flexibility sampling the fully wrapped around container ends in storehouse, built-in screw rod also introduces three gas conduits, point
Not Wei suction catheters, air induction conduit and test conduit.Wherein, suction catheters connects Pressure gauge and vacuum pump,
Air induction conduit connects argon by effusion meter, and test conduit connects gas tester, and every conduit is all with opening
Closing valve；
(2) fill lute at the gap between sampling storehouse and container, and be tamping with band；
(3) opening vacuum pump and evacuating valve, be completely exhausted out sampling the air in storehouse, now sampling warehouse amasss
Boil down to zero；
(4) close evacuating valve and vacuum pump, stand five minutes, check the sealing of system.If Pressure gauge
Reading is unchanged, is considered as air tight, can carry out next step operation；
(5) opening air intake valve, be passed through argon, accurate recording meter readings and duration of ventilation also calculate argon
Air volume；
(6) close air intake valve, utilize screw rod to open container ends screw plug, stand 15 minutes；
(7) open test valve, connect gas tester, read measurement data；
(8) concentration of described gas to be measured can be calculated according to below equation:
C=C0(V1+V2)/V1
Wherein, C is the actual concentrations of gas to be measured, C0For the test concentrations of instrument, V1Within container
Spatial volume, V2For sampling the calibrated volumes in storehouse, i.e. it is passed through the volume of argon.
Present invention have an advantage that
(1) utilize flexibility sampling storehouse to carry out full environmental sealing, can avoid and outside air generation gas exchange
Affect test result, be simultaneously suitable for the gas test within different specification size hermetic container.
(2) by the way of evacuation, applying argon gas, the volume in sampling storehouse is calibrated, according to instrument test
The cumulative volume of data and sealing system calculates, it is possible to obtain the original concentration of container internal gas.
(3) sampling is carried out with test process simultaneously, it is possible to avoids sample to shift the error caused, tests every time
Required time is less than 30 minutes, it is possible to achieve the on-the-spot quickly test of sample.
Accompanying drawing explanation
The present invention is described in detail with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is the connection diagram of each assembly in test.In figure, 1. sampling storehouse, 2. band, 3. container, 4. takes out
Airway, 5. air induction conduit, 6. test conduit, 7. screw plug, 8. screw rod, 9. Pressure gauge, 10. vacuum pump, 11.
Effusion meter, 12. argon, 13. gas testers, 14. evacuating valves, 15. air intake valves, 16. test valves.
Fig. 2 is the on-the-spot test time-concentration curve figure of four samples A, B, C, D.
Detailed description of the invention
As it is shown in figure 1, set up test device according to following steps and measure:
(1) flexibility samples storehouse 1 fully wrapped around container 3 end, and built-in screw rod 8 also introduces three gas conduits,
It is respectively suction catheters 4, air induction conduit 5 and test conduit 6.Wherein, suction catheters 4 connects Pressure gauge 9 and true
Empty pump 10, air induction conduit 5 connects argon 12 by effusion meter 11, and test conduit 6 connects gas tester 13,
Every conduit is all with controlled valve；
(2) fill lute at the gap between sampling storehouse 1 and container 3, and be tamping with band 2；
(3) open vacuum pump 10 and evacuating valve 14, be completely exhausted out sampling the air in storehouse, now sample storehouse
Volume compression is zero；
(4) close evacuating valve 14 and vacuum pump 10, stand five minutes, check the sealing of system；If pressure
Power meter reading is unchanged, is considered as air tight, can carry out next step operation；
(5) open air intake valve 15, be passed through argon 12, the reading of accurate recording effusion meter 11 and duration of ventilation
And calculate argon volume；
(6) close air intake valve 15, utilize screw rod 8 to open the screw plug 7 of container 3 end, stand 15 minutes,
Fully it is diffused in making gas from vessel 3 in sampling storehouse 1 and reaches balance；
(7) open test valve 16, connect gas tester 13, read measurement data；
(8) concentration of described gas to be measured can be calculated according to below equation:
C=C0(V1+V2)/V1
Wherein, C is the actual concentrations of gas to be measured, C0For the test concentrations of instrument, V1Sky within container
Between volume, V2For sampling the calibrated volumes in storehouse, i.e. it is passed through the volume of argon.
The following is the specific embodiment that inventor provides.
Embodiment:
The present embodiment is internal organic volatile part (VOCs) gas concentration of a kind of container using screw plug to seal
On-the-spot test, is tested the sample that tetra-storage time of A, B, C, D is different altogether, and process of the test is such as
Under:
(1) require testing container is sealed and connects each assembly according to Fig. 1；
(2) open vacuum pump and evacuating valve, be completely exhausted out sampling the air in storehouse；
(3) close evacuating valve and vacuum pump, stand five minutes, check the sealing of system；
(4) open air intake valve, be passed through argon, the flow velocity ν and duration of ventilation t of accurate recording effusion meter, meter
Calculate argon volume；
(5) close air intake valve, utilize screw rod to open the screw plug of container ends, stand 15 minutes；
(6) open test valve, be simultaneously connected with VOCs gas tester, read measurement data in real time, number
Being spaced apart 1 second according to reading, the testing time is not less than 3 minutes；
(7) draw time-concentration curve according to instrument data, after registration reaches stabilised platform, read data
Test concentrations as instrument；
(8) concentration of described gas to be measured can be calculated according to below equation:
C=C0(V1+V2)/V1
Wherein, C is the actual concentrations of gas to be measured, C0For the test concentrations of instrument, V1Sky within container
Between volume, V2For sampling the calibrated volumes in storehouse, i.e. it is passed through the volume of argon, herein equal to the flow velocity of effusion meter
The product of ν and duration of ventilation t.
The field test data of the present embodiment is as in figure 2 it is shown, figure it is seen that enter opening test valve
Before row test, instrument can't detect VOCs gas, and instrument registration is zero.After opening test valve, along with taking
In sample storehouse, gas enters instrument, and gas concentration moment rises and maintain within the testing time stable reading, this
On the one hand illustrating that this test system has good sealing, on the other hand explanation measurement result can represent whole
Gas concentration within individual system.Result of calculation is as shown in table 1:
Table 1: the internal VOCs gas test result of container
| Shuttle | V1(L) | ν(L/min) | t(min) | V2(L) | C0(ppm) | C(ppm) |
| A | 1.515 | 0.8 | 4 | 3.2 | 31.3 | 97.4 |
| B | 1.515 | 0.6 | 5 | 3.0 | 9.6 | 28.6 |
| C | 1.515 | 0.7 | 4.5 | 3.15 | 56.4 | 173.7 |
| D | 1.515 | 0.85 | 4 | 3.4 | 7.7 | 25.0 |
Claims (1)
1. a gas concentration on-the-spot test method, it is characterized in that: use flexibility sampling storehouse that testing container is carried out full environmental sealing, its volume is calibrated by the way of being bled, ventilated in sampling storehouse, utilizing built-in screw rod to open container screw plug makes internal gas be diffused in whole system, complete the gas concentration test of whole enclosed system finally by gas tester, and calculate the original concentration of gas in container according to container internal volume and sampling storehouse calibrated volumes；
Concrete method of testing comprises the steps:
(1) flexibility sampling the fully wrapped around container ends in storehouse, built-in screw rod also introduces three gas conduits, respectively suction catheters, air induction conduit and test conduit；Wherein, suction catheters connects Pressure gauge and vacuum pump, air induction conduit connection traffic meter and argon, and test conduit connects gas tester, and each conduit is all with controlled valve；
(2) fill lute at the gap between sampling storehouse and container, and be tamping with band；
(3) opening vacuum pump and evacuating valve, be completely exhausted out sampling the air in storehouse, now sampling warehouse overstocks and is condensed to zero；
(4) close evacuating valve and vacuum pump, stand five minutes, check the sealing of system, if pressure gauge reading is unchanged, be considered as air tight, next step operation can be carried out；
(5) opening air intake valve, be passed through argon, accurate recording meter readings and duration of ventilation also calculate argon volume；
(6) close air intake valve, utilize screw rod to open container ends screw plug, stand 15 minutes；
(7) open test valve, connect gas tester, read measurement data；
(8) gas concentration can be calculated according to below equation:
C=C0(V1+V2)/V1
Wherein, C is the actual concentrations of gas to be measured, C0For the test concentrations of instrument, V1Spatial volume within container, V2For sampling the calibrated volumes in storehouse, i.e. it is passed through the volume of argon.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510223501.0A CN104764862B (en) | 2015-05-05 | 2015-05-05 | A kind of gas concentration on-the-spot test method |
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| CN104764862B true CN104764862B (en) | 2016-08-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792943B (en) * | 2015-05-05 | 2017-03-01 | 西安近代化学研究所 | A kind of gas on-site testing device sealing rigid container for screw plug |
| CN107917831A (en) * | 2017-12-27 | 2018-04-17 | 上海神开气体技术有限公司 | A kind of simple apparatus and method for preparing VOC gas |
| CN110455510B (en) * | 2019-08-08 | 2020-12-15 | 西安近代化学研究所 | Multipurpose working head device for vacuumizing and depth measurement |
| CN113373037A (en) * | 2020-09-28 | 2021-09-10 | 苏州海路生物技术有限公司 | Method and instrument for detecting components of intestinal flora fermentation gas |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2689213Y (en) * | 2004-04-09 | 2005-03-30 | 赵祖昌 | Micro-sampler |
| CN101539549A (en) * | 2009-04-29 | 2009-09-23 | 昆明理工大学 | Photoionization gas chromatography detection method of organic volatile compounds in air |
| CN102778368A (en) * | 2012-08-09 | 2012-11-14 | 山东省产品质量监督检验研究院 | Sampling method and collector for organic volatile matters in product/sample |
| CN202886149U (en) * | 2012-08-09 | 2013-04-17 | 马文平 | Sampling collector of organic volatile compounds in product/sample |
| CN104316367A (en) * | 2014-10-09 | 2015-01-28 | 西安近代化学研究所 | Gas collecting device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6550347B2 (en) * | 2000-11-30 | 2003-04-22 | Bruce J. Bradley | Vacuum air component sampler |
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2015
- 2015-05-05 CN CN201510223501.0A patent/CN104764862B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2689213Y (en) * | 2004-04-09 | 2005-03-30 | 赵祖昌 | Micro-sampler |
| CN101539549A (en) * | 2009-04-29 | 2009-09-23 | 昆明理工大学 | Photoionization gas chromatography detection method of organic volatile compounds in air |
| CN102778368A (en) * | 2012-08-09 | 2012-11-14 | 山东省产品质量监督检验研究院 | Sampling method and collector for organic volatile matters in product/sample |
| CN202886149U (en) * | 2012-08-09 | 2013-04-17 | 马文平 | Sampling collector of organic volatile compounds in product/sample |
| CN104316367A (en) * | 2014-10-09 | 2015-01-28 | 西安近代化学研究所 | Gas collecting device |
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Granted publication date: 20160817 |