CN105388238A - Detection apparatus - Google Patents

Detection apparatus Download PDF

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Publication number
CN105388238A
CN105388238A CN201510919073.5A CN201510919073A CN105388238A CN 105388238 A CN105388238 A CN 105388238A CN 201510919073 A CN201510919073 A CN 201510919073A CN 105388238 A CN105388238 A CN 105388238A
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CN
China
Prior art keywords
communicated
transfer valve
detector
carrier gas
pick
Prior art date
Application number
CN201510919073.5A
Other languages
Chinese (zh)
Inventor
王本腊
刘德华
Original Assignee
力合科技(湖南)股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 力合科技(湖南)股份有限公司 filed Critical 力合科技(湖南)股份有限公司
Priority to CN201510919073.5A priority Critical patent/CN105388238A/en
Publication of CN105388238A publication Critical patent/CN105388238A/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02Column chromatography
    • G01N30/26Conditioning of the fluid carrier; Flow patterns
    • G01N30/28Control of physical parameters of the fluid carrier
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02Column chromatography
    • G01N30/62Detectors specially adapted therefor
    • G01N30/64Electrical detectors
    • G01N30/68Flame ionisation detectors

Abstract

The invention discloses a detection apparatus for detecting non-methane total hydrocarbons. The apparatus comprises: a first switching valve provided with a first quantification ring, wherein the first switching valve is provided with a first carrier gas source; a second switching valve connected with the first switching valve and provided with a second quantification ring, wherein the second switching valve is provided with a second carrier gas source; a sample gas source connected with the first switching valve; a chromatographic column connected with the first switching valve and used for separating methane in a sample gas in the first quantification ring; a sampling pump connected with the second switching valve and pumping the sample gas in the sample gas source into the first quantification ring and the second quantification ring; a detector connected with the first switching valve and used for detecting methane in the sample gas output by the first quantification ring, wherein the detector is also connected with the second switching valve and is used for detecting total hydrocarbons in the samples gas output by the second quantification ring; and a control mechanism used for keeping the pressure and the flow amount of the sample gas entering the detector unchanged, wherein the sample gas is output by the second switching valve. The non-methane total hydrocarbon detection result of the detection apparatus provided by the invention is accurate.

Description

A kind of pick-up unit

Technical field

The application relates to field of measuring technique, relates to a kind of pick-up unit, is specifically related to a kind of pick-up unit for detecting NMHC.

Background technology

NMHC, typically refers to all volatilizable hydrocarbon except methane.When the NMHC in air exceedes certain concentration, except directly the health of human body being harmful to, also can producing photo-chemical smog through solar radiation under certain condition, face harm is made to environment and the mankind.Therefore, very necessary to the detection of NMHC in air.

To the detection of NMHC in prior art, be all the content measuring total hydrocarbon and methane hydrocarbon in sample gas with gas chromatograph with flame ionization ditector respectively, the difference of getting both is the content of NMHC.

But, in prior art, to the sample gas of high concentration, hydrocarbons mixing, total hydrocarbon to go out peak bad, peak is irregular, thus affects the accuracy of testing result.

Therefore, on the basis of existing technology, a kind of NMHC testing result pick-up unit is accurately those skilled in the art's problem demanding prompt solutions.

Summary of the invention

For solving the problems of the technologies described above, the invention provides a kind of pick-up unit, the detection of NMHC, it is accurate to NMHC testing result.

Technical scheme provided by the invention is as follows:

A kind of pick-up unit, for the detection of NMHC, comprises,

Be provided with the first transfer valve of the first quantitative loop, described first transfer valve is provided with the first carrier gas source;

Be communicated with described first transfer valve, and be provided with the second transfer valve of the second quantitative loop, described second transfer valve is provided with the second carrier gas source;

The sample source of the gas be communicated with described first transfer valve;

The chromatographic column be communicated with described first transfer valve, for separating of the methane in sample gas in described first quantitative loop;

Be communicated with described second transfer valve, by the sample gas in described sample source of the gas being evacuated to the sampling pump in described first quantitative loop and described second quantitative loop;

The detector for detecting methane in sample gas that described first quantitative loop exports be communicated with described first transfer valve, described detector is also communicated with described second transfer valve, for detecting total hydrocarbon in sample gas that described second quantitative loop exports;

And be arranged between described second transfer valve and described detector, the sample gas for keeping described second transfer valve to export enters the constant control gear of described detector pressure versus flow.

Preferably, described control gear is vapour lock.

Preferably, described first transfer valve is ten-way valve, comprise, the first carrier gas inlet be communicated with described first carrier gas source, the first sample gas inlet be communicated with described sample source of the gas, the the first sample gas be communicated with described six-way valve exports, the first carrier gas be communicated with described detector exports, the first connected entrance be communicated with described first quantitative loop and the second connected entrance, the third connecting mouth be communicated with described chromatographic column and the 4th connected entrance, and the 5th connected entrance and the 6th connected entrance, having to make described first transfer valve makes sample gas enter the first state of described chromatographic column by described third connecting mouth by carrier gas, the second state of described chromatographic column is entered by described 4th connected entrance with carrier gas.

Preferably, described second transfer valve is six-way valve, comprise, with the second sample gas inlet of described first sample gas outlet, the the second sample gas be communicated with described sampling pump exports, the second carrier gas inlet be communicated with described second carrier gas source, the second carrier gas be communicated with described detector exports, and the 7th connected entrance and eight connectivity mouth.

Preferably, described pick-up unit also comprises air generator, and described air generator is communicated with described first transfer valve, described second transfer valve and described detector respectively.

Preferably, be provided with between described air generator and described detector except hydrocarbon cleaning system, the described hydrocarbon passed in the air of described detector produced for removing described air generator except hydrocarbon cleaning system.

Preferably, between described first carrier gas source and described first transfer valve, be provided with the first controller controlling carrier gas flux.

Preferably, between described second carrier gas source and described second transfer valve, the second controller controlling carrier gas flux is provided with.

Preferably, described pick-up unit also comprises hydrogen generator, and described hydrogen generator is communicated with described detector.

Preferably, between described hydrogen generator and described detector, be provided with the 3rd controller controlling hydrogen flowing quantity.

Pick-up unit provided by the invention, owing to being provided with control gear between the second transfer valve and detector, the sample gas that this control gear can keep the second transfer valve to export enters the constant of the pressure versus flow of detector, therefore, compared with prior art, high concentration can be made, chromatographic peak that the combination gas of hydrocarbons goes out rule, improve quantitative repeatability, thus make NMHC testing result more accurate.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

The structural representation of the pick-up unit that Fig. 1 provides for the embodiment of the present invention;

The structural representation of state during the sample introduction of the pick-up unit that Fig. 2 provides for the embodiment of the present invention;

The pick-up unit sample gas that Fig. 3 provides for the embodiment of the present invention enters the structural representation of the first state of described chromatographic column by described third connecting mouth;

The pick-up unit carrier gas that Fig. 4 provides for the embodiment of the present invention enters the structural representation of the second state of described chromatographic column by described 4th connected entrance.

Embodiment

Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.

Please as shown in Figures 1 to 4, the embodiment of the present invention provides a kind of pick-up unit, comprises, and is provided with the first transfer valve 1 of the first quantitative loop 101, the first transfer valve 1 is provided with the first carrier gas source 31; Be communicated with the first transfer valve 1, and be provided with the second transfer valve 2 of the second quantitative loop 102, the second transfer valve 2 is provided with the second carrier gas source 32; The sample source of the gas 4 be communicated with the first transfer valve 1; The chromatographic column 5 be communicated with the first transfer valve 1, for separating of the methane in sample gas in the first quantitative loop 101; Be communicated with the second transfer valve 2, by the sample gas in sample source of the gas 4 being evacuated to the sampling pump 6 in the first quantitative loop 101 and the second quantitative loop 102; The detector 7 for detecting methane in sample gas that the first quantitative loop 101 exports be communicated with the first transfer valve 1, detector 7 is also communicated with the second transfer valve 2, for detecting total hydrocarbon in sample gas that the second quantitative loop 102 exports; And be arranged between the second transfer valve 2 and detector 7, the sample gas for keeping the second transfer valve 2 to export enters the constant control gear 8 of detector pressure versus flow.

To the detection of NMHC in prior art, be all the content measuring total hydrocarbon and methane hydrocarbon in sample gas with gas chromatograph with flame ionization ditector respectively, the difference of getting both is the content of NMHC.

But, in prior art, to the sample gas of high concentration, hydrocarbons mixing, total hydrocarbon to go out peak bad, peak is irregular, thus affects the accuracy of testing result.

The pick-up unit that the embodiment of the present invention provides, owing to being provided with control gear 8 between the second transfer valve 2 and detector 7, the sample gas that this control gear 8 can keep the second transfer valve 2 to export enters the constant of the pressure versus flow of detector 7, therefore, compared with prior art, high concentration can be made, chromatographic peak that the combination gas of hydrocarbons goes out rule, improve quantitative repeatability, thus make NMHC testing result more accurate.

Wherein, control gear 8 preferably adopts vapour lock.

The first transfer valve 1 in the embodiment of the present invention is ten-way valve, comprise, the first carrier gas inlet 10 be communicated with the first carrier gas source 31, the first sample gas inlet 17 be communicated with sample source of the gas 4, the the first sample gas be communicated with six-way valve 2 exports 18, the first carrier gas be communicated with detector 7 exports 19, the first connected entrance 11 and the second connected entrance 12 be communicated with the first quantitative loop 101, the third connecting mouth 13 be communicated with chromatographic column 5 and the 4th connected entrance 14, and the 5th connected entrance 15 and the 6th connected entrance 16, having to make the first transfer valve 1 makes sample gas enter the first state of chromatographic column 5 by third connecting mouth 13 by carrier gas, the second state of chromatographic column 1 is entered by the 4th connected entrance 14 with carrier gas.

The second transfer valve 2 in the embodiment of the present invention is six-way valve, comprise, 18 the second sample gas inlet 27 be communicated with are exported with the first sample gas, the the second sample gas be communicated with sampling pump 6 exports 28, the second carrier gas inlet 20 be communicated with the second carrier gas source 32, the second carrier gas be communicated with detector 7 exports 29, and the 7th connected entrance 21 and eight connectivity mouth 22.

Please as shown in Figure 2, the structural representation of state during the sample introduction of the pick-up unit that provides for the embodiment of the present invention of Fig. 2.Sample gas in sample source of the gas 4 is under the effect of sampling pump 6, the first transfer valve 1 is entered by the first sample gas inlet 17, then the first quantitative loop 101 is entered by the first connected entrance 11, enter the second quantitative loop 102 by the second connected entrance 12, first sample gas outlet 18 and the second sample gas inlet 27, thus realize carrying out sample introduction to the first quantitative loop 101 and the second quantitative loop 102.

Please as shown in Figure 3, the pick-up unit sample gas that Fig. 3 provides for the embodiment of the present invention enters the structural representation of the first state of described chromatographic column by described third connecting mouth.After the sample introduction of the first quantitative loop 101 and the second quantitative loop 102 completes, switch the first transfer valve 1 and six-way valve 2, the sample band of gas in first quantitative loop 101 is entered chromatographic column 5 by the first carrier gas inlet 10, first connected entrance 11, second connected entrance 12, third connecting mouth 13 by carrier gas that the first carrier gas source 31 provides successively, methane in sample gas, after chromatographic column is separated, is brought into detector by carrier gas detected by the 4th connected entrance 14, the 6th connected entrance 16, the 5th connected entrance 15, first carrier gas outlet 19 successively.

Meanwhile, the carrier gas that the second carrier gas source 32 provides enters the second transfer valve 2 by the second carrier gas inlet 20, is entered in detector 7 to detect by the sample band of gas in the second quantitative loop 102 successively by the 7th connected entrance 21, eight connectivity mouth 22, second carrier gas outlet 29.In the process, total hydrocarbon first goes out peak.

After methane goes out peak, quick switching first transfer valve 1 and the second transfer valve 2, the carrier gas that first carrier gas source 31 is provided enters chromatographic column 5 by the 6th connected entrance 16, the 5th connected entrance 15, the 4th connected entrance 14 successively, specifically please as shown in Figure 4, the pick-up unit carrier gas provided for the embodiment of the present invention enters the structural representation of the second state of described chromatographic column by described 4th connected entrance.Utilize carrier gas fast the hydrocarbon blowout except methane, shorten measuring period, thus arrive the object purging chromatographic column, ensure that long-time running is not contaminated, increase the service life.

The pick-up unit that the embodiment of the present invention provides also comprises air generator 9, and air generator 9 is communicated with the first transfer valve 1, second transfer valve 2 and detector 7 respectively.Be provided with between air generator 9 and detector 7 except hydrocarbon cleaning system 91, except the hydrocarbon passed in the air of detector 7 that hydrocarbon cleaning system 91 produces for removing air generator 9.

Wherein, between the first carrier gas source 31 and the first transfer valve 1, the first controller 41 controlling carrier gas flux is provided with.The second controller 42 controlling carrier gas flux is provided with between the second carrier gas source 32 and the second transfer valve 2.Wherein, the first controller 41 preferably adopts mass flowmeter with second controller 42.

The pick-up unit that the embodiment of the present invention provides also comprises hydrogen generator 71, and hydrogen generator 71 is communicated with detector 7.Wherein, between hydrogen generator 71 and detector 7, be provided with the 3rd controller the 43, three controller 43 controlling hydrogen flowing quantity and preferably adopt mass flowmeter.

To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (10)

1. a pick-up unit, for the detection of NMHC, is characterized in that, comprises,
Be provided with first transfer valve (1) of the first quantitative loop (101), described first transfer valve (1) is provided with the first carrier gas source (31);
Be communicated with described ten-way valve (1), and be provided with second transfer valve (2) of the second quantitative loop (102), described second transfer valve (2) is provided with the second carrier gas source (32);
The sample source of the gas (4) be communicated with described first transfer valve (1);
The chromatographic column (5) be communicated with described first transfer valve (1), for separating of the methane in sample gas in described first quantitative loop (101);
Be communicated with described second transfer valve (2), by the sample gas in described sample source of the gas (4) being evacuated to described first quantitative loop (101) and the sampling pump (6) in described second quantitative loop (102);
The detector (7) for detecting methane in sample gas that described first quantitative loop (101) exports be communicated with described first transfer valve (1), described detector (7) is also communicated with described six-way valve (2), for detecting total hydrocarbon in sample gas that described second quantitative loop (102) exports;
And, be arranged between described second transfer valve (2) and described detector (7), the sample gas for keeping described second transfer valve (2) to export enters the constant control gear (8) of described detector (7) pressure versus flow.
2. pick-up unit according to claim 1, is characterized in that, described control gear (8) is vapour lock.
3. pick-up unit according to claim 1, it is characterized in that, described first transfer valve (1) is ten-way valve (1), comprise, the first carrier gas inlet (10) be communicated with described first carrier gas source (31), the first sample gas inlet (17) be communicated with described sample source of the gas (4), the the first sample gas be communicated with described six-way valve (2) exports (18), the first carrier gas be communicated with described detector (7) exports (19), the first connected entrance (11) be communicated with described first quantitative loop (101) and the second connected entrance (12), the third connecting mouth (13) be communicated with described chromatographic column (5) and the 4th connected entrance (14), and the 5th connected entrance (15) and the 6th connected entrance (16), having to make described first transfer valve (1) makes sample gas enter the first state of described chromatographic column (1) by described third connecting mouth (13) by carrier gas, the second state of described chromatographic column (1) is entered by described 4th connected entrance (14) with carrier gas.
4. pick-up unit according to claim 3, it is characterized in that, described second transfer valve (2) is six-way valve, comprise, the second sample gas inlet (27) that (18) be communicated with is exported with described first sample gas, the the second sample gas be communicated with described sampling pump (6) exports (28), the second carrier gas inlet (20) be communicated with described second carrier gas source (32), the second carrier gas be communicated with described detector (7) exports (29), and the 7th connected entrance (21) and eight connectivity mouth (22).
5. pick-up unit according to claim 1, it is characterized in that, described pick-up unit also comprises air generator (9), and described air generator (9) is communicated with described first transfer valve (1), described second transfer valve (2) and described detector (7) respectively.
6. pick-up unit according to claim 5, it is characterized in that, be provided with between described air generator (9) and described detector (7) except hydrocarbon cleaning system (91), the described hydrocarbon passed in the air of described detector (7) produced for removing described air generator (9) except hydrocarbon cleaning system (91).
7. pick-up unit according to claim 1, is characterized in that, is provided with the first controller (41) controlling carrier gas flux between described first carrier gas source (31) and described first transfer valve (1).
8. pick-up unit according to claim 1, is characterized in that, is provided with the second controller (42) controlling carrier gas flux between described second carrier gas source (32) and described second transfer valve (2).
9. pick-up unit according to claim 1, is characterized in that, described pick-up unit also comprises hydrogen generator (71), and described hydrogen generator (71) is communicated with described detector (7).
10. pick-up unit according to claim 9, is characterized in that, is provided with the 3rd controller (43) controlling hydrogen flowing quantity between described hydrogen generator (71) and described detector (7).
CN201510919073.5A 2015-12-11 2015-12-11 Detection apparatus CN105388238A (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790348A (en) * 1972-03-22 1974-02-05 Mine Safety Appliances Co Apparatus for determining the carbon monoxide, methane and total hydrocarbons content in air
JPS5555251A (en) * 1978-10-18 1980-04-23 Horiba Ltd Methane and non-methane hydrocarbon measuring method
JPS58210562A (en) * 1982-05-31 1983-12-07 Shimadzu Corp Method and apparatus for determining methane and non-methane hydrocarbons
US5392634A (en) * 1992-08-27 1995-02-28 Horiba, Ltd. Hydrocarbon analyzer and method of analyzing hydrocarbon
CN101923098A (en) * 2010-08-20 2010-12-22 南京特种气体厂有限公司 Continuous on-line analysis device of benzene, total hydrocarbons, methane and CO in carbon dioxide
CN104297389A (en) * 2014-10-23 2015-01-21 佛山市南海区环境保护监测站 Chromatographic analysis system
CN204479528U (en) * 2015-04-03 2015-07-15 常州磐诺仪器有限公司 NMHC and benzene class material detect special purpose device
CN104849374A (en) * 2015-06-11 2015-08-19 广东俐峰环保科技有限公司 Non-methane hydrocarbon analysis equipment and method
CN205280678U (en) * 2015-12-11 2016-06-01 力合科技(湖南)股份有限公司 Detection device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790348A (en) * 1972-03-22 1974-02-05 Mine Safety Appliances Co Apparatus for determining the carbon monoxide, methane and total hydrocarbons content in air
JPS5555251A (en) * 1978-10-18 1980-04-23 Horiba Ltd Methane and non-methane hydrocarbon measuring method
JPS58210562A (en) * 1982-05-31 1983-12-07 Shimadzu Corp Method and apparatus for determining methane and non-methane hydrocarbons
US5392634A (en) * 1992-08-27 1995-02-28 Horiba, Ltd. Hydrocarbon analyzer and method of analyzing hydrocarbon
CN101923098A (en) * 2010-08-20 2010-12-22 南京特种气体厂有限公司 Continuous on-line analysis device of benzene, total hydrocarbons, methane and CO in carbon dioxide
CN104297389A (en) * 2014-10-23 2015-01-21 佛山市南海区环境保护监测站 Chromatographic analysis system
CN204479528U (en) * 2015-04-03 2015-07-15 常州磐诺仪器有限公司 NMHC and benzene class material detect special purpose device
CN104849374A (en) * 2015-06-11 2015-08-19 广东俐峰环保科技有限公司 Non-methane hydrocarbon analysis equipment and method
CN205280678U (en) * 2015-12-11 2016-06-01 力合科技(湖南)股份有限公司 Detection device

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