CN105784863A - Toxic or harmful gas analysis system and using method - Google Patents
Toxic or harmful gas analysis system and using method Download PDFInfo
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- CN105784863A CN105784863A CN201610134765.3A CN201610134765A CN105784863A CN 105784863 A CN105784863 A CN 105784863A CN 201610134765 A CN201610134765 A CN 201610134765A CN 105784863 A CN105784863 A CN 105784863A
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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
Abstract
The invention relates to a toxic or harmful gas analysis system. A sample gas inlet part comprises a sample gas receiving pipe, a sample gas feeding pipe, a gas receiving valve and a pressure reducer; the gas receiving valve is arranged at one end of the sample gas receiving pipe; the other end of the sample gas receiving pipe is communicated with one end of the sample gas feeding pipe; the pressure reducer is arranged at the other end of the sample gas feeding pipe; an auxiliary gas inlet part comprises a clean gas receiving pipe, a standard gas receiving pipe, a mixed gas delivery pipe, an emptying valve, the other gas receiving valve and a control valve; the gas receiving valve is arranged at one end of the standard gas receiving pipe; the other end of the standard gas receiving pipe is communicated with the mixed gas delivery pipe; one end of the clean gas receiving pipe is communicated with the mixed gas delivery pipe through the control valve; the middle part of the mixed gas delivery pipe is communicated with one end of the emptying valve; the other end of the mixed gas delivery pipe is communicated with the other end of the sample gas feeding pipe; a vacuumizing part is communicated with the other end of the emptying valve.
Description
Technical field
The present invention relates to field of gas detection, be specially analysis system and the using method of a kind of toxic and harmful.
Background technology
In the process of gas generation, in order to ensure the quality (such as degree of purity, whether there is objectionable impurities etc.) of product, it is necessary to before dispatching from the factory, corresponding gas products is carried out detection and analyzes.In the process of detection, likely tested gas is poisonous, flammable explosive gas, for instance silane, phosphine, germane, sulfur dioxide etc., and when run into need these gas is detected time, it is very careful to need, and slightly reveals and will the people and animals of periphery, environment be worked the mischief.
The detection system of currently available technology, it is only three-way valve and sample gas (gas to be measured), cleaning gas (are generally helium, for pipeline being purged before starting detection every time) connect with detecting instrument, because when dismantling sample gas after testing every time, more sample gas can be remained in pipeline, in order to avoid operator are produced to endanger by the sample gas of these residuals, therefore, pipe-line system can be arranged in ventilation gas holder, the air outlet connection exhaust gas processing device of ventilation gas holder.
But consequently, it is possible to may create the problem that 1. ventilation gas holders costly, using area be there are certain requirements simultaneously；2. adopting helium directly to purge displacement, cause that helium consumes more, relatively costly, because helium is rare gas, price is much more expensive, additionally, also can there is the sample danger at pipeline residual.
Summary of the invention
It is an object of the invention to solve the problems referred to above, it is proposed to the analysis system of a kind of toxic and harmful, to solve the leakage of sample gas, and reduce helium make consumption.
The present invention is it is also proposed that the using method of analysis system of a kind of toxic and harmful so that simple to operate easily, and accuracy in detection is high.
The analysis system of the toxic and harmful of the present invention, including evacuation portion, sample gas intake section and assist gas intake section；Described sample gas intake section B includes sample trachea, sample snorkel, connects air valve and decompressor, the described air valve that connects is arranged at one end of described sample trachea, the other end of described sample trachea connects one end of described sample snorkel, and the other end of described sample snorkel is provided with decompressor；Described assist gas intake section include purgative gas trachea, Standard Gases trachea, mixing appendix, emptying valve, described in connect air valve and control valve, the described air valve that connects is arranged at one end of described Standard Gases trachea, the other end of described Standard Gases trachea connects described mixing appendix, one end of purgative gas trachea connects described mixing appendix by described control valve, one end of the middle part connection emptying valve of described mixing appendix, the other end of described mixing appendix connects the other end of described sample snorkel；Described evacuation portion connects the other end of described emptying valve.
Preferably, described evacuation portion includes vacuum generator, the other end of the described empty valve of negative port connection of described vacuum generator.
Preferably, the other end of described Standard Gases trachea connects described mixing appendix by described control valve；The other end of described sample trachea connects described sample snorkel by described control valve.
Preferably, described control valve is stop valve, described in connect air valve be needle valve, described emptying valve is stop valve.
Preferably, the barotropic gas of described vacuum generator is nitrogen.
Preferably, being additionally provided with check valve, described check valve is arranged at the close end of the inlet end of described mixing appendix.
Preferably, being additionally provided with Pressure gauge, described Pressure gauge is arranged at the other end of described sample snorkel.
Preferably, described sample snorkel and 316 stainless steel tubes that described mixing appendix is 1/8 inch.
The using method of the analysis system of the toxic and harmful of the present invention, comprises the following steps:
Step 1: decompressor communication with detection equipment；
Step 2: pipeline purges, and closes described emptying valve and the described air valve that connects, helium enters gas circuit by purgative gas trachea and carries out displacement purging, closes the control valve that helium accesses, opens emptying valve and pipeline is carried out evacuation；
Step 3: calibrating gas accesses, closes emptying valve, and that opens Standard Gases trachea connects air valve；
Step 4: pipeline purges, and closes described emptying valve and the described air valve that connects, helium enters gas circuit by purgative gas trachea and carries out displacement purging, closes the control valve that helium accesses, opens emptying valve and pipeline is carried out evacuation；
Step 5: sample gas accesses, closes emptying valve, and that opens sample trachea connects air valve；
Step 6: line clear, closes described emptying valve and the described air valve that connects, and helium enters gas circuit by purgative gas trachea and carries out displacement purging, closes the control valve that helium accesses, opens emptying valve and pipeline is carried out evacuation.
Preferably, described step 2 and step 4 circulate after carrying out 3-6 time respectively, then carry out next step.
The analysis system of the toxic and harmful of the present invention, simple and reliable for structure, maintain easily, and low cost of manufacture, applicable heavy industrialization is quoted；The using method of the analysis system of the toxic and harmful of the present invention, it is easy to operation, step is simple.
Accompanying drawing explanation
The present invention will be further described for accompanying drawing, but the content in accompanying drawing does not constitute any limitation of the invention.
Fig. 1 is the schematic diagram of one of them embodiment of the present invention；
Fig. 2 is the schematic diagram of the pipe-line system of prior art.
Wherein: evacuation portion A, vacuum generator A1, sample gas intake section B, sample trachea B1, sample snorkel B2, decompressor B4, assist gas intake section C, purgative gas trachea C1, Standard Gases trachea C2, mixing appendix C3, emptying valve C4, control valve 2, connect air valve 3, check valve 4, Pressure gauge 5, detection equipment 10.
Detailed description of the invention
The specific embodiment of the present invention given below, is used for the composition of the present invention is described in further detail.
The analysis system of the toxic and harmful of the present embodiment, as it is shown in figure 1, include evacuation portion A, sample gas intake section B and assist gas intake section C；Described sample gas intake section B includes sample trachea B1, sample snorkel B2, meets air valve 3 and decompressor B4, the described air valve 3 that connects is arranged at one end of described sample trachea B1, the other end of described sample trachea B1 connects one end of described sample snorkel B2, and the other end of described sample snorkel B2 is provided with decompressor B4；The described air valve 3 that connects is arranged at one end of described sample trachea B1, reduces the space storing gas in pipeline, reduces the gas leakage remaining in pipeline when dismantling sample gas as far as possible.Described assist gas intake section C includes purgative gas trachea C1, Standard Gases trachea C2, mixing appendix C3, emptying valve C4, described connect air valve 3 and control valve 2, the described air valve 3 that connects is arranged at one end of described Standard Gases trachea C2, the other end of described Standard Gases trachea C2 connects described mixing appendix C3, one end of purgative gas trachea C1 connects described mixing appendix C3 by described control valve 2, one end of the middle part connection emptying valve C4 of described mixing appendix C3, the other end of described mixing appendix C3 connects the other end of described sample snorkel B2；Described evacuation portion A connects the other end of described emptying valve C4.
The using method of the analysis system of the present embodiment is as follows:
Step 1: decompressor B4 communication with detection equipment 10；In general, described detection equipment 10 is chromatograph, and the time that different gas can go out peak in chromatograph is all different, therefore, according to chromatograph appearance time and peak area, it is possible to detect component and the content of tested gas；By the decompressor B4 decompression to pipeline air pressure, it is to avoid detection equipment 10 is subject to excessive air pressure and damages.
Step 2: pipeline purges, closes described emptying valve C4 and described connects air valve 3, and helium enters gas circuit by purgative gas trachea C1 to carry out displacement and purge, and closes the control valve 2 of helium access, opens emptying valve C4 and pipeline is carried out evacuation；Causing that cost increases in order to avoid consuming too much helium, employing purges displacement and evacuation be combined with each other, after pipeline is carried out purging displacement by input helium, pipeline is carried out evacuation, so just the waste of helium can be avoided, simultaneously, it is ensured that pipeline has been replaced totally.Preferably, after this step repeats 5 times, then next step is started.
Step 3: calibrating gas accesses, closes emptying valve C4, and that opens Standard Gases trachea C2 connects air valve 3；Owing to the Main Function of Standard Gases is to demarcate chromatograph, ensure repeatability and the accuracy of instrument, and as the demarcation of sample detection result (composition and content), therefore, need before sample gas is detected, access the calibrating gas of principal component in advance, and with detection equipment 10, calibrating gas is detected, and draw the detection data of calibrating gas.
Step 4: pipeline purges, closes described emptying valve C4 and described connects air valve 3, and helium enters gas circuit by purgative gas trachea C1 to carry out displacement and purge, and closes the control valve 2 of helium access, opens emptying valve C4 and pipeline is carried out evacuation；In order to avoid the accuracy of detection, pipeline will be cleaned before detecting every time.Preferably, after this step repeats 5 times, then next step is started.
Step 5: sample gas accesses, closes emptying valve C4, and that opens sample trachea B1 connects air valve 3；Sample gas is detected by detection equipment 10, and draws the detection data of sample gas；And then compare with the detection data of calibrating gas, content and the composition of sample gas can be drawn.
Step 6: line clear, closes described emptying valve C4 and described connects air valve 3, and helium enters gas circuit by purgative gas trachea C1 to carry out displacement and purge, and closes the control valve 2 that helium accesses, opens emptying valve C4 and pipeline is carried out evacuation.In order to avoid sample gas after removal, remain in the leakage of the gas in pipeline to work the mischief, it is therefore desirable to after pipeline is emptied, carry out the dismounting of sample gas cylinder again.
Preferably, described evacuation portion A includes the other end of the described empty valve C4 of negative port connection of vacuum generator A1, described vacuum generator A1, and more specifically, the barotropic gas of described vacuum generator A1 is nitrogen.Adopt vacuum generator A1 that pipe-line system is carried out evacuation, it is possible to reach good vacuum effectiveness, and compared with air exhauster, pipeline is simple, easy to operate, and with low cost.
Preferably, the other end of described Standard Gases trachea C2 connects described mixing appendix C3 by described control valve 2；The other end of described sample trachea B1 connects described sample snorkel B2 by described control valve 2；More specifically, described control valve 2 is stop valve, described in connect air valve 3 for needle valve, described emptying valve C4 is stop valve.Needle valve can regulate flow, because if the input flow rate of sample gas, calibrating gas is excessive, can cause that the consumption of sample gas is excessive, wastes finished product；If but crossing and cannot be carried out at least checking；And control valve 2 and adopt stop valve; and by two valves, the access of sample gas and calibrating gas is controlled, it is connect air valve 3 regulate input air pressure to first pass through when operation, and after pipeline all empties; open control valve 2 again, further pipe-line system is protected.
Preferably, the present embodiment is additionally provided with check valve 4, and described check valve 4 is arranged at the close end of the inlet end of described mixing appendix C3.Arranging check valve 4 can only allow calibrating gas and cleaned gas stream enter in pipe-line system, sample gas is avoided to flow to calibrating gas and clean the access port of gas, and then pollution pipeline, and avoid sample gas to leak from the access port of calibrating gas and cleaning gas, it is ensured that the sealing of whole pipeline.
Preferably, the present embodiment is additionally provided with check valve 4, is additionally provided with Pressure gauge 5, and described Pressure gauge 5 is arranged at the other end of described sample snorkel B2.Arranging Pressure gauge can air pressure in moment monitored pipeline, it is to avoid air pressure is excessive and causes the infringement to detection equipment 10.
Preferably, described sample snorkel B2 and 316 stainless steel tubes that described mixing appendix C3 is 1/8 inch.The diameter of pipeline is not easily excessive, crosses conference and causes the waste of various gas, and owing to the cleanliness factor of 316 stainless steel tubes is of a relatively high, not easily sample gas is polluted.
The analysis system of the toxic and harmful of the present embodiment and using method have the advantage that 1. employing evacuation and the method for gas purging displacement, pipeline are cleaned, it is to avoid clean the waste of gas, be substantially reduced running cost；2., before dismounting sample gas, pipeline is cleared up, it is to avoid the sample gas remained in pipeline pollutes；3. adopt check valve 4 to avoid sample gas to be leaked by the access port of calibrating gas and cleaning gas, it is ensured that the sealing of whole pipeline；4. adopting nitrogen is the vacuum generator A1 of pressure source, and the effect making evacuation is notable, and with low cost, easily operate.
The know-why of the present invention is described above in association with specific embodiment.These descriptions are intended merely to explanation principles of the invention, and can not be construed to limiting the scope of the invention by any way.Based on explanation herein, those skilled in the art need not pay performing creative labour can associate other detailed description of the invention of the present invention, and these modes fall within protection scope of the present invention.
Claims (10)
1. the analysis system of a toxic and harmful, it is characterised in that: include evacuation portion, sample gas intake section and assist gas intake section；
Described sample gas intake section B includes sample trachea, sample snorkel, connects air valve and decompressor, the described air valve that connects is arranged at one end of described sample trachea, the other end of described sample trachea connects one end of described sample snorkel, and the other end of described sample snorkel is provided with decompressor；
Described assist gas intake section include purgative gas trachea, Standard Gases trachea, mixing appendix, emptying valve, described in connect air valve and control valve, the described air valve that connects is arranged at one end of described Standard Gases trachea, the other end of described Standard Gases trachea connects described mixing appendix, one end of purgative gas trachea connects described mixing appendix by described control valve, one end of the middle part connection emptying valve of described mixing appendix, the other end of described mixing appendix connects the other end of described sample snorkel；
Described evacuation portion connects the other end of described emptying valve.
2. the analysis system of toxic and harmful according to claim 1, it is characterised in that: described evacuation portion includes vacuum generator, the other end of the described empty valve of negative port connection of described vacuum generator.
3. the analysis system of toxic and harmful according to claim 1, it is characterised in that: the other end of described Standard Gases trachea connects described mixing appendix by described control valve；The other end of described sample trachea connects described sample snorkel by described control valve.
4. the analysis system of toxic and harmful according to claim 1, it is characterised in that: described control valve is stop valve, described in connect air valve be needle valve, described emptying valve is stop valve.
5. the analysis system of toxic and harmful according to claim 2, it is characterised in that: the barotropic gas of described vacuum generator is nitrogen.
6. the analysis system of toxic and harmful according to claim 1, it is characterised in that: being additionally provided with check valve, described check valve is arranged at the close end of the inlet end of described mixing appendix.
7. the analysis system of toxic and harmful according to claim 1, it is characterised in that: being additionally provided with Pressure gauge, described Pressure gauge is arranged at the other end of described sample snorkel.
8. the analysis system of toxic and harmful according to claim 1, it is characterised in that: described sample snorkel and 316 stainless steel tubes that described mixing appendix is 1/8 inch.
9. the using method of the analysis system of the toxic and harmful according to claim 1-8 any one, it is characterised in that: comprise the following steps:
Step 1: decompressor communication with detection equipment；
Step 2: pipeline purges, and closes described emptying valve and the described air valve that connects, helium enters gas circuit by purgative gas trachea and carries out displacement purging, closes the control valve that helium accesses, opens emptying valve and pipeline is carried out evacuation；
Step 3: calibrating gas accesses, closes emptying valve, and that opens Standard Gases trachea connects air valve；
Step 4: pipeline purges, and closes described emptying valve and the described air valve that connects, helium enters gas circuit by purgative gas trachea and carries out displacement purging, closes the control valve that helium accesses, opens emptying valve and pipeline is carried out evacuation；
Step 5: sample gas accesses, closes emptying valve, and that opens sample trachea connects air valve；
Step 6: line clear, closes described emptying valve and the described air valve that connects, and helium enters gas circuit by purgative gas trachea and carries out displacement purging, closes the control valve that helium accesses, opens emptying valve and pipeline is carried out evacuation.
10. the using method of toxic and harmful according to claim 9, it is characterised in that: described step 2 and step 4 circulate after carrying out 3-6 time respectively, then carry out next step.
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| CN201610134765.3A CN105784863A (en) | 2016-03-09 | 2016-03-09 | Toxic or harmful gas analysis system and using method |
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| CN201610134765.3A CN105784863A (en) | 2016-03-09 | 2016-03-09 | Toxic or harmful gas analysis system and using method |
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Cited By (1)
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Application publication date: 20160720 |