CN201156041Y - Dual frame photometric detector for gas chromatograph - Google Patents
Dual frame photometric detector for gas chromatograph Download PDFInfo
- Publication number
- CN201156041Y CN201156041Y CNU2007200270218U CN200720027021U CN201156041Y CN 201156041 Y CN201156041 Y CN 201156041Y CN U2007200270218 U CNU2007200270218 U CN U2007200270218U CN 200720027021 U CN200720027021 U CN 200720027021U CN 201156041 Y CN201156041 Y CN 201156041Y
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- flame
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- air hose
- photometric detector
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Abstract
The utility model relates to a dual-flame photometric detector of a gas chromatograph with small affection to the flame. The dual-flame photometric detector comprises a base seat, a fixing seat, an optical detection system, and a shading and emptying device; the optical detection system is installed on the right side of the upper fixing seat, and the shading and emptying device is installed above the upper fixing seat; a right air pipe, a hydrogen pipe, a left air pipe and a carrier gas connecting pipe are respectively installed inside the base seat; a flame cavity is arranged at the upper part of the base seat, a flame nozzle is installed at the top part of the flame cavity, a flame air pipe is installed at the middle part of the flame nozzle, and a shading cover is connected with the top part of the base seat outside the periphery of the flame nozzle; the flame nozzle is arranged inside the cavity of the shading cover; a silica glass cover is connected with the upper part of the upper fixing seat of the periphery of the shading cover; the shading cover is arranged inside the cavity of the silica glass cover; a plurality of lower flame jet orifices are distributed on the flame nozzle around the flame air pipe; the left air pipe and the flame cavity are communicated with the lower flame jet orifices on the flame nozzle. The dual-flame photometric detector is mainly used for the mark detection of sulphur bearing or phosphorated compound, especially sulphide.
Description
Technical field
The utility model relates to a kind of pick-up unit of gas chromatograph, relates in particular to a kind of gas chromatography double-flame photometric detector.
Background technology
Flame photometric detector (FPD) (Flame Photometric Detector FPD) is to utilize rich hydrogen flame that the organism of sulfur-bearing, phospha atom is decomposed, and forms excited state molecule, when they get back to ground state, launches the light of certain wavelength.This light intensity is directly proportional with tested component concentration.So it is a mutual relationship with material and light is the inspection side method of mechanism, belongs to photometry.Because of it is to launch light after the molecular excitation, so it is the molecular emission detecting device in the photometry.The luminous flame of flame photometric detector (FPD) is that the performance of core, it and detecting device of this detecting device is closely related.Press the structure of luminous flame part, flame photometric detector (FPD) can be divided into three kinds again: single flame type (SFPD), two flame types (DFPD) and pulse flame type (PFPD); Gas chromatography double-flame photometric detector commonly used is comprising pedestal, be installed in upper fixed seat, optical detection system, shading emptying device on the pedestal; The optical detection system is installed in the right side of upper fixed seat, and the shading emptying device is installed in the top of upper fixed seat.
1, single flame type
The structure of universal flame photometric detector (FPD) and response characteristic are as previously mentioned.But it has four shortcomings:
(1) sampling volume of easily putting out a fire is less than several microlitres.If sample size is big slightly.Then because of moment anoxic make fray-out of flame.
When (2) easily the tested component of cancellation flows out separately, can be in flame normal response, but when a large amount of hydro carbons and tested component entered flame simultaneously, the response of tested component seriously descended, even does not have response.
(3) response of sulphur often departs from quadratic relationship with the sulphur atom flow velocity that enters flame.
(4) response is relevant with molecular structure, the molecular structure difference of compound, and the response on flame photometric detector (FPD) has very big difference.
Burgett etc. exchange hydrogen and air intake in order to overcome the shortcoming of easy fire extinguishing, and promptly sample is blended in the air ambient with hydrogen earlier and burns; Claim transoid, at this moment, sample size reaches 10 μ L does not put out a fire yet, but has brought the luminous interference of hydro carbons.Because the hydrocarbon that enters can not contact with oxygen in flame base, could contact with the oxygen in the diffusion layer up to flame top, it is luminous to burn.Certainly adding a light shield in flame base also has little significance.This form sensitivity is on the low side, and back three shortcomings still exist.
The flame photometric detector (FPD) of day island proper Tianjin GC-17A of company is that air is directly introduced the flame kernel hole, after carrier gas mixes with hydrogen outside grate firing burn, claim modified, this structure sample size greatly can not cause moment anoxic and fray-out of flame yet.In addition, it has also kept the characteristic of the rich hydrogen diffusion flame of Brody burner, makes hydro carbons in the flame bottom.And phosphorus (P), sulphur (S) are luminous on top, highly sensitive.But back three shortcomings of universal single flame photometric detector still exist.
2, two flame types
In order to overcome four shortcomings of universal single flame photometric detector.Patterson etc. have proposed dual frame photometric detector (DFPD) first.Sun Chuanjing has also made report in " gas chromatographic analysis philosophy and technique ".Dual frame photometric detector (DFPD) in the relevant report has the rich hydrogen flame of up and down two coaxial series connection, after carrier gas and the air mixed, combines with excessive hydrogen on first flame-thrower nozzle again, forms flame (flame 1) down.Remaining hydrogen under air-breathing, flame in the formation (flame 2), it is positioned at down after the flame flow, both are at a distance of about about 17mm.During igniting, light flame earlier, leniently light down flame then automatically.The purpose of following flame is each component that chromatographic column is flowed out, and resolves into fairly simple products of combustion.Experiment shows: when surveying phosphorus (P), sulphur (S) compound, and existing S between upper and lower flame
2Luminous with HPO.This shows component decomposition substantially fully in following flame.The purpose of last flame is to burn once more by the following products of combustion of flame, makes S
2Luminous again with HPO.Following flame is the same with the single flame photometric detector, and it is bigger that its luminescent condition is disturbed by solvent etc., and it is more stable to go up the luminescent condition of flame, and its light is delivered to photomultiplier by quartz window and received, and is signal.
When going out solvent peak, following flame may extinguish moment, but go up flame because of in combustion gas is arranged, air is arranged outward, be still fired state.After the solvent, following flame can be lighted automatically.The dual frame photometric detector (DFPD) sample introduction can be as big as 60 μ L, and does not put out a fire.In addition, because it is more stable to go up the luminescent condition of flame, so it has not only avoided the cancellation effect, the response of phosphorus only is directly proportional with the phosphorus atoms flow velocity, the response of sulphur only is directly proportional with the sulphur atom square of flow velocity.And it is irrelevant with the molecular structure of compound.Shortcoming is that sensitivity is lower than the single flame photometric detector slightly.
Summary of the invention
The purpose of this utility model provides a kind of to the little gas chromatography double-flame photometric detector of flame influence.
To achieve these goals, the technical scheme that the utility model is taked is: a kind of gas chromatography double-flame photometric detector, comprising pedestal, be installed in upper fixed seat, optical detection system, shading emptying device on the pedestal; The optical detection system is installed in the right side of upper fixed seat, and the shading emptying device is installed in the top of upper fixed seat; Be separately installed with right air hose, hydrogen pipe, left air hose, carrier gas connecting pipe in the pedestal; Pedestal top has the flame cavity, flame cavity top is equipped with flame-thrower nozzle, and the flame-thrower nozzle middle part is equipped with the flame air hose, and the flame air hose passes flame-thrower nozzle, flame air hose and right air hose are an integral body, and the pedestal top in the outside is connected with light shield around the flame-thrower nozzle; Flame-thrower nozzle is positioned at the light shield cavity; The upper fixed seat top in the outside is connected with quartz glass cover around the light shield; Light shield is positioned at the quartz glass cover cavity; Its characteristics are: be distributed with a plurality of flame spray orifices down on the flame-thrower nozzle around the flame air hose, following flame spray orifice communicates with the flame cavity, and hydrogen pipe, carrier gas connecting pipe communicate with the flame cavity; Left side air hose, flame cavity communicate with the following flame spray orifice of top.
The beneficial effects of the utility model are, changed the hydrogen-rich flame flame structure of dual frame photometric detector (DFPD), overcome that the single flame type is easily put out a fire, easy cancellation and dual frame photometric detector (DFPD) in the past commonly used shortcomings such as the rich hydrogen flame sensitivity of two coaxial series connection is low slightly up and down, the response and the sensitivity that have increased sample analysis.
Description of drawings
Fig. 1 is a kind of structural representation of the present utility model;
Fig. 2 is a side view of the present utility model;
Fig. 3 is the assembly structure synoptic diagram of pedestal in the utility model, air hose, hydrogen pipe, flame-thrower nozzle, light shield, X-over, capillary column or carrier gas connecting pipe;
Fig. 4 is the partial enlarged drawing among Fig. 1;
Fig. 5 is the partial enlarged drawing among Fig. 3;
Fig. 6 is the flame combustion synoptic diagram in the utility model.
Among the figure: 1. pedestal, 2. right air hose, 3. hydrogen pipe, 4. heating jacket, 5. shading cover, 6. emptying cap screw, 7. emptying cap liner, 8. emptying joint, 9. emptying cap, 10. gib screw, 11. left light tube, 12. right light tubes, 13. power leads, 14. signal wire, 15. high-voltage power supplies, 16. gib screws, 17. photomultiplier, 18. optical filters, 19. right holders, 20. left holder, 21. heat radiator, 22. heat insulation tubes, 23. connecting cylinder, 24. quartz windows, 25. left air hoses, 26. the adjusting plug screw, 27. set nuts, 28. reflective mirrors, 29. flame-thrower nozzle, 30. upper fixed seats, 31. quartz glass covers, 32. light shield, 33. kapillary X-overs, 34. packed column X-overs, 35. sealing nut, 36. packed columns, 37. capillary columns or carrier gas connecting pipe.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is described further:
Shown in Fig. 1,2,3,4,5,6, a kind of gas chromatography double-flame photometric detector is comprising pedestal 1, be installed in upper fixed seat 30, optical detection system, shading emptying device on the pedestal 1; In the present embodiment, optical detection system has quartz window 24, connecting cylinder 23, heat insulation tube 22, heat radiator 21, left holder 20, right holder 19, optical filter 18, photomultiplier 17, gib screw 16, high-voltage power supply 15, signal wire 14, power lead 13, right light tube 12, left light tube 11 and gib screw 10; The optical detection system is installed in the right side of upper fixed seat 30; In the present embodiment, the shading emptying device is comprising emptying cap screw 6, emptying cap liner 7, emptying joint 8 and emptying cap 9, and the shading emptying device is installed in the top of upper fixed seat 30; Be separately installed with right air hose 2, hydrogen pipe 3, left air hose 25, carrier gas connecting pipe 37 in the pedestal 1; Pedestal 1 top has the flame cavity, flame cavity top is equipped with flame-thrower nozzle 29, and the flame-thrower nozzle middle part is equipped with the flame air hose, and the flame air hose passes flame-thrower nozzle 29, flame air hose and right air hose 2 are an integral body, and pedestal 1 top in the outside is connected with light shield 32 around the flame-thrower nozzle; Flame-thrower nozzle is positioned at light shield 32 cavitys; Upper fixed seat 30 tops in the outside are connected with quartz glass cover 31 around the light shield 32; Light shield 32 is positioned at quartz glass cover 31 cavitys; Be distributed with a plurality of flame spray orifices down on the flame-thrower nozzle around the flame air hose, following flame spray orifice communicates with the flame cavity, and hydrogen pipe 3, carrier gas connecting pipe communicate with the flame cavity; Left side air hose 25, flame cavity communicate with the following flame spray orifice of top; In the present embodiment, this gas chromatography double-flame photometric detector also comprises the reflective light modulating device that has shading cover 5, have reflective cavity on the upper fixed seat 30 in quartz glass cover 31 left sides, shading cover 5 is installed on the upper fixed seat 30 of reflective cavity left end, reflective light modulating device also comprises regulates plug screw 26, on the reflective mirror 28, reflective mirror be the matrix polished surface and with regulate plug screw 26 and be one-piece construction, reflective mirror is positioned at reflective cavity, adjusting plug screw 26 passes shading cover 5 and becomes to be threaded with it, reflective mirror is towards flame-thrower nozzle one side, and reflective mirror is corresponding with the optical detection system; In the present embodiment, reflective light modulating device also comprises set nut 27, and set nut 27 is positioned at shading cover 5 left sides, and set nut 27 is threaded for 26 one-tenth with the adjusting plug screw; In the present embodiment, pedestal 1 bottom is fixedly connected with X-over 33,34; Because have reflective light modulating device in the utility model, reflective mirror 28 can parallelly move in reflective cavity in the reflective light modulating device, has made things convenient for all kinds of chromatographic columns to be connected with of the present utility model; In the utility model, owing to be distributed with a plurality of flame spray orifices down on the flame-thrower nozzle around the flame air hose, following flame spray orifice communicates with the flame cavity, and hydrogen pipe 3, carrier gas connecting pipe communicate with the flame cavity; Left side air hose 25, flame cavity communicate with the following flame spray orifice of top, therefore form upper and lower rich hydrogen flame series connection, a plurality of rich hydrogen flames down are in parallel, in the present embodiment, a plurality of flame spray orifices down can adopt circular distribution equalizing structure form, carrier gas and hydrogen mix the back and flow out at uniform following flame spray orifice, and hydrogen excessive on the air that each time flame spray orifice feeds from left air hose 25 and the following flame spray orifice combines flame under the formation; Remaining hydrogen forms flame in flame air hose upper end under the air-breathing that flows through the flame air hose, it is positioned on the following flame flow; During igniting, light flame earlier, light down flame then automatically; The purpose of following flame is each sample component that chromatographic column is flowed out, and resolves into fairly simple products of combustion; Because the design of flame one side has reflective light modulating device, sample segment characteristic light reflected back optics acquisition system with the flame generation, and flame status and properties of samples can analyze per sample the time, distance between real-time regulated light source and reflective mirror, select best reflection spot, to strengthen the sample response value to greatest extent.The utility model can connect capillary column, stainless steel and glass chromatography column easily by X-over 33,34; The instrument routine is configured to the capillary column connected mode, when using stainless steel and glass chromatography column, available stainless steel, glass or flexible quartz glass kapillary link to each other packed column by X-over as the carrier gas connecting pipe with detecting device, solved problems such as sample absorption and dead volume are big; In the present embodiment, pedestal 1 bottom is the syndeton form of capillary chromatographic column and packed column, the instrument routine preferentially is configured to the capillary column connected mode, when using stainless steel and glass chromatography column, available stainless steel, glass or flexible quartz glass kapillary link to each other packed column by X-over as the carrier gas connecting pipe with pedestal, be connected with right air hose 2, hydrogen pipe 3 and left air hose 25 simultaneously on the relevant position of pedestal 1; In the present embodiment, when capillary chromatographic column is analyzed, connect kapillary X-over 33, capillary column 37, flexible gasket and sealing nut 35 in pedestal 1 bottom; In the present embodiment, when using chromatography column to analyze, connect kapillary X-over 33, carrier gas connecting pipe 37, packed column X-over 34, flexible gasket and sealing nut 35 in pedestal 1 bottom.
Claims (4)
1, a kind of gas chromatography double-flame photometric detector is comprising pedestal (1), be installed in upper fixed seat (30), optical detection system, shading emptying device on the pedestal (1); The optical detection system is installed in the right side of upper fixed seat (30), and the shading emptying device is installed in the top of upper fixed seat (30); Be separately installed with right air hose (2), hydrogen pipe (3), left air hose (25), carrier gas connecting pipe in the pedestal (1); Pedestal (1) top has the flame cavity, flame cavity top is equipped with flame-thrower nozzle (29), the flame-thrower nozzle middle part is equipped with the flame air hose, the flame air hose passes flame-thrower nozzle, flame air hose and right air hose (2) are an integral body, and pedestal (1) top in the outside is connected with light shield (32) around the flame-thrower nozzle; Flame-thrower nozzle is positioned at light shield (32) cavity; Light shield (32) upper fixed seat (30) top in the outside all around is connected with quartz glass cover (31); Light shield (32) is positioned at quartz glass cover (31) cavity; It is characterized in that: be distributed with a plurality of flame spray orifices down on the flame-thrower nozzle around the flame air hose, following flame spray orifice communicates with the flame cavity, and hydrogen pipe (3), carrier gas connecting pipe communicate with the flame cavity; Left side air hose (25), flame cavity communicate with the following flame spray orifice of top.
2, gas chromatography double-flame photometric detector according to claim 1, it is characterized in that: this gas chromatography double-flame photometric detector also comprises the reflective light modulating device that has shading cover (5), have reflective cavity on the upper fixed seat (30) in described quartz glass cover (31) left side, shading cover (5) is installed on the upper fixed seat (30) of reflective cavity left end, reflective light modulating device also comprises regulates plug screw (26), on the reflective mirror (28), reflective mirror be the matrix polished surface and with regulate plug screw (26) and be one-piece construction, reflective mirror is positioned at reflective cavity, adjusting plug screw (26) passes shading cover (5) and becomes to be threaded with it, reflective mirror is towards described flame-thrower nozzle one side, and reflective mirror is corresponding with described optical detection system.
3, gas chromatography double-flame photometric detector according to claim 2, it is characterized in that: described reflective light modulating device also comprises set nut (27), set nut (27) is positioned at described shading cover (5) left side, and set nut (27) becomes to be threaded with described adjusting plug screw (26).
4, gas chromatography double-flame photometric detector according to claim 3 is characterized in that: described pedestal (1) bottom is fixedly connected with X-over (33,34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200270218U CN201156041Y (en) | 2007-08-23 | 2007-08-23 | Dual frame photometric detector for gas chromatograph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200270218U CN201156041Y (en) | 2007-08-23 | 2007-08-23 | Dual frame photometric detector for gas chromatograph |
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| Publication Number | Publication Date |
|---|---|
| CN201156041Y true CN201156041Y (en) | 2008-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200270218U Expired - Fee Related CN201156041Y (en) | 2007-08-23 | 2007-08-23 | Dual frame photometric detector for gas chromatograph |
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| CN (1) | CN201156041Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706445A (en) * | 2012-04-25 | 2012-10-03 | 徐州能达燃烧控制工程有限公司 | Flame detection probe capable of adjusting visual field |
| CN105067729A (en) * | 2015-07-30 | 2015-11-18 | 安徽中杰信息科技有限公司 | Flame photometric detector for measuring phosphor-containing compounds and sulfur-containing compounds |
-
2007
- 2007-08-23 CN CNU2007200270218U patent/CN201156041Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706445A (en) * | 2012-04-25 | 2012-10-03 | 徐州能达燃烧控制工程有限公司 | Flame detection probe capable of adjusting visual field |
| CN105067729A (en) * | 2015-07-30 | 2015-11-18 | 安徽中杰信息科技有限公司 | Flame photometric detector for measuring phosphor-containing compounds and sulfur-containing compounds |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081126 |