CN104764862A - Gas concentration site testing method - Google Patents
Gas concentration site testing method Download PDFInfo
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- CN104764862A CN104764862A CN201510223501.0A CN201510223501A CN104764862A CN 104764862 A CN104764862 A CN 104764862A CN 201510223501 A CN201510223501 A CN 201510223501A CN 104764862 A CN104764862 A CN 104764862A
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- gas
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- volume
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- 238000012360 testing method Methods 0.000 title claims abstract description 54
- 239000007789 gas Substances 0.000 claims abstract description 81
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000005070 sampling Methods 0.000 claims abstract description 37
- 229910052786 argon Inorganic materials 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 230000006698 induction Effects 0.000 claims description 7
- 238000010998 test method Methods 0.000 claims description 6
- 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
- 230000000740 bleeding effect Effects 0.000 claims 1
- 239000000523 sample Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 239000012855 volatile organic compound Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a gas concentration site testing method which can achieve site testing of gas concentration inside a rigid container which is sealed by adopting a plug. According to the gas concentration site testing method, the tail end of the container is fully coated with a flexible sampling bin, the flexible sampling bin is filled with sealing paste and fixed through a sealing belt, a screw is prearranged inside the sampling bin, three gas guide pipes are led in the sampling bin, the gas suction guide pipe is connected with a pressure meter and a vacuum pump, the gas inlet guide pipe is connected with argon gas through a flow meter, and the testing guide pipe is connected with a gas tester; volume calibration is conducted by supplying vacuum and inflating the argon gas before testing, the screw is adopted to open the plug, the gas enters the sampling bin, and testing is completed through the gas tester; the gas concentration inside the container is calculated through a sampling bin calibration volume and a volume of the interior of the container. The gas concentration site testing method is suitable for site testing of the gas inside the rigid container sealed by adopting the plug.
Description
Technical field
The present invention relates to analytical test field, particularly relate to a kind of gas concentration on-the-spot test method.
Background technology
Some armament systems usually can be filled inert gas in inside and be adopted screw plug to seal to ensure security in production assembling process; along with the increase of equipment active time and in transport, the impact of environmental factor in storage process; the phenomenons such as warhead caulking gum burn into is aging may be there is; cause the gas that internal charge self volatilizees, decomposition produces to be diffused in the cavity of whole equipment, cause weapons and ammunitions and lost efficacy and jeopardized storehouse and personal security.
For the test of closed container internal gas concentration, the method usually adopted utilizes gas sampling bag or sampling probe after internal tank extracts a certain amount of gaseous sample, and recycling instrument carries out analysis and detects.But this method is only applicable to those containers having special sample connection or seal with flexible materials such as rubber plugs.For the rigidity closed container adopting screw plug sealing, if directly open screw plug sampling, internal tank gas is exposed in open environment, gas exchanges will certainly occur, and the gas gathered cannot the time of day of reaction vessel interior, has an impact to test result; In addition, test after utilizing sampler bag or sampling probe sampling, sample, also may because state changes bring error through a transfer process again.Therefore, under air-proof condition, how to complete sampling and on-the-spot test, be the key solving this type of internal tank gas concentration test problem simultaneously.At present, for the on-the-spot test of the internal tank gas concentration adopting screw plug to seal, also not relevant technology report.
Summary of the invention
The invention provides a kind of gas concentration on-the-spot test method, may be used for detecting the rigid container internal gas concentration adopting screw plug sealing.For achieving the above object, the present invention takes following technical scheme to realize:
Utilize the complete wrapping container end in flexible sampling storehouse, inside is filled with a sealing mud fixing with band; The inner preset screw rod in sampling storehouse also introduces gas conduit, air in sampling storehouse is discharged by vacuum pump during test, and quantitatively pass into argon gas and carry out volume calibration, read data by gas tester after opening screw plug, gas concentration obtains by sampling storehouse calibrated volumes and internal tank volume computing.
Concrete method of testing comprises the following steps:
(1) flexibility is sampled the complete wrapping container end in storehouse, built-in screw rod also introduces three gas conduits, is respectively suction catheters, air induction conduit and test conduit.Wherein, suction catheters Bonding pressure table and vacuum pump, air induction conduit connects argon gas by flowmeter, test tubes connection gas tester, and every root conduit is all with controlled valve;
(2) the gap place sampled between storehouse and container is filled with a sealing mud, and is tamping with band;
(3) open vacuum pump and evacuating valve, discharge the air in sampling storehouse completely, now sampling warehouse overstocks and is condensed to zero;
(4) close evacuating valve and vacuum pump, leave standstill 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) open air intake valve, pass into argon gas, accurate recording meter readings and duration of ventilation also calculate argon gas volume;
(6) close air intake valve, utilize screw rod to open container ends screw plug, leave standstill 15 minutes;
(7) open test valve, connect gas tester, read measurement data;
(8) concentration of described gas to be measured can obtain according to following formulae discovery:
C＝C
0(V
1+V
2)/V
1
Wherein, C is the actual concentrations of gas to be measured, C
0for the test concentrations of instrument, V
1for the spatial volume of internal tank, V
2for sampling the calibrated volumes in storehouse, namely pass into the volume of argon gas.
Advantage of the present invention is:
(1) utilize flexible sampling storehouse to carry out full environmental sealing, can avoid affecting test result with outside air generation gas exchanges, be applicable to the gas test of different specification size closed container inside simultaneously.
(2) by vacuumizing, the mode of the applying argon gas volume to sampling storehouse calibrates, the cumulative volume according to instrument test data and sealing system calculates, and can obtain the original concentration of internal tank gas.
(3) sampling and test process carry out simultaneously, and sample can be avoided to shift the error caused, and each test required time is no more than 30 minutes, and the scene that can realize sample is tested fast.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Fig. 1 is the connection diagram of each assembly in test.In figure, 1. sampling storehouse, 2. band, 3. container, 4. suction catheters, 5. air induction conduits, 6. test conduit, 7. screw plug, 8. screw rod, 9. tensimeter, 10. vacuum pump, 11. flowmeters, 12. argon gas, 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.
Embodiment
As shown in Figure 1, set up proving installation according to following steps and measure:
(1) flexibility is sampled storehouse 1 wrapping container 3 end completely, built-in screw rod 8 also introduces three gas conduits, is respectively suction catheters 4, air induction conduit 5 and test conduit 6.Wherein, suction catheters 4 Bonding pressure table 9 and vacuum pump 10, air induction conduit 5 connects argon gas 12 by flowmeter 11, and test conduit 6 connects gas tester 13, and every root conduit is all with controlled valve;
(2) the gap place sampled between storehouse 1 and container 3 is filled with a sealing mud, and is tamping with band 2;
(3) open vacuum pump 10 and evacuating valve 14, discharge the air in sampling storehouse completely, now sampling warehouse overstocks and is condensed to zero;
(4) close evacuating valve 14 and vacuum pump 10, leave standstill 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) open air intake valve 15, pass into argon gas 12, the reading of accurate recording flowmeter 11 and duration of ventilation also calculate argon gas volume;
(6) closedown air intake valve 15, utilizes screw rod 8 to open the screw plug 7 of container 3 end, leaves standstill 15 minutes, makes fully to be diffused in gas from vessel 3 sample in storehouse 1 and reach balance;
(7) open test valve 16, connect gas tester 13, read measurement data;
(8) concentration of described gas to be measured can obtain according to following formulae discovery:
C＝C
0(V
1+V
2)/V
1
Wherein, C is the actual concentrations of gas to be measured, C
0for the test concentrations of instrument, V
1for the spatial volume of internal tank, V
2for sampling the calibrated volumes in storehouse, namely pass into the volume of argon gas.
It is below the specific embodiment that inventor provides.
Embodiment:
The present embodiment is a kind of on-the-spot test of internal tank organic volatile part (VOCs) gas concentration adopting screw plug to seal, and test the sample that A, B, C, D tetra-storage times are different altogether, process of the test is as follows:
(1) require seal testing container and connect each assembly according to Fig. 1;
(2) open vacuum pump and evacuating valve, discharge the air in sampling storehouse completely;
(3) close evacuating valve and vacuum pump, leave standstill five minutes, check the sealing of system;
(4) open air intake valve, pass into argon gas, the flow velocity ν of accurate recording flowmeter and duration of ventilation t, calculate argon gas volume;
(5) close air intake valve, utilize screw rod to open the screw plug of container ends, leave standstill 15 minutes;
(6) open test valve, connect VOCs gas tester, read measurement data in real time, digital independent is spaced apart 1 second, and the test duration is not less than 3 minutes simultaneously;
(7) draw time-concentration curve according to instrument data, after registration reaches stabilised platform, read the test concentrations of data as instrument;
(8) concentration of described gas to be measured can obtain according to following formulae discovery:
C＝C
0(V
1+V
2)/V
1
Wherein, C is the actual concentrations of gas to be measured, C
0for the test concentrations of instrument, V
1for the spatial volume of internal tank, V
2for sampling the calibrated volumes in storehouse, namely passing into the volume of argon gas, equaling the flow velocity ν of flowmeter and the product of duration of ventilation t herein.
As shown in Figure 2, as can be seen from Figure 2, before opening test valve and testing, instrument can't detect VOCs gas to the field test data of the present embodiment, and instrument registration is zero.Open testing valve behind the door, along with in sampling storehouse, gas enters instrument, gas concentration rises instantaneously and within the test duration, maintains stable reading, and this illustrates that this test system has good sealing on the one hand, illustrates that measurement result can represent the gas concentration of whole system inside on the other hand.Result of calculation is as shown in table 1:
Table 1: internal tank VOCs gas test result
| Sampling receptacle | V 1(L) | ν(L/min) | t(min) | V 2(L) | C 0(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: adopt flexible sampling storehouse to carry out full environmental sealing to testing container, its volume is calibrated by the mode of bleeding to sampling storehouse, ventilating, 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 internal tank volume and sampling storehouse calibrated volumes;
Concrete method of testing comprises the steps:
(1) flexibility is sampled the complete wrapping container end in storehouse, built-in screw rod also introduces three gas conduits, is respectively suction catheters, air induction conduit and test conduit; Wherein, suction catheters Bonding pressure table and vacuum pump, air induction conduit connection traffic takes into account argon gas, test tubes connection gas tester, and each conduit is all with controlled valve;
(2) the gap place between sampling storehouse and container is filled with a sealing mud, and is tamping with band;
(3) open vacuum pump and evacuating valve, discharge the air in sampling storehouse completely, now sampling warehouse overstocks and is condensed to zero;
(4) close evacuating valve and vacuum pump, leave standstill 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) open air intake valve, pass into argon gas, accurate recording meter readings and duration of ventilation also calculate argon gas volume;
(6) close air intake valve, utilize screw rod to open container ends screw plug, leave standstill 15 minutes;
(7) open test valve, connect gas tester, read measurement data;
(8) gas concentration can obtain according to following formulae discovery:
C＝C
0(V
1+V
2)/V
1
Wherein, C is the actual concentrations of gas to be measured, C
0for the test concentrations of instrument, V
1for the spatial volume of internal tank, V
2for sampling the calibrated volumes in storehouse, namely pass into the volume of argon gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510223501.0A CN104764862B (en) | 2015-05-05 | 2015-05-05 | A kind of gas concentration on-the-spot test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510223501.0A CN104764862B (en) | 2015-05-05 | 2015-05-05 | A kind of gas concentration on-the-spot test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104764862A true CN104764862A (en) | 2015-07-08 |
| CN104764862B CN104764862B (en) | 2016-08-17 |
Family
ID=53646823
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|---|---|---|---|
| CN201510223501.0A Expired - Fee Related CN104764862B (en) | 2015-05-05 | 2015-05-05 | A kind of gas concentration on-the-spot test method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792943A (en) * | 2015-05-05 | 2015-07-22 | 西安近代化学研究所 | Gas field testing device |
| 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 |
| CN110455510A (en) * | 2019-08-08 | 2019-11-15 | 西安近代化学研究所 | A kind of multipurpose Working head device for vacuumizing with 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 |
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| US20020062702A1 (en) * | 2000-11-30 | 2002-05-30 | Bradley Bruce J. | Vacuum air component sampler |
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| 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 |
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2015
- 2015-05-05 CN CN201510223501.0A patent/CN104764862B/en not_active Expired - Fee Related
Patent Citations (6)
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|---|---|---|---|---|
| US20020062702A1 (en) * | 2000-11-30 | 2002-05-30 | Bradley Bruce J. | Vacuum air component sampler |
| 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792943A (en) * | 2015-05-05 | 2015-07-22 | 西安近代化学研究所 | Gas field testing device |
| 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 |
| CN110455510A (en) * | 2019-08-08 | 2019-11-15 | 西安近代化学研究所 | A kind of multipurpose Working head device for vacuumizing with 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 |
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| Publication number | Publication date |
|---|---|
| CN104764862B (en) | 2016-08-17 |
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Granted publication date: 20160817 |
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