CN101183090A - Apparatus and method for regulating flow quantity distribution of tobacco detection system - Google Patents
Apparatus and method for regulating flow quantity distribution of tobacco detection system Download PDFInfo
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- CN101183090A CN101183090A CNA2007103015367A CN200710301536A CN101183090A CN 101183090 A CN101183090 A CN 101183090A CN A2007103015367 A CNA2007103015367 A CN A2007103015367A CN 200710301536 A CN200710301536 A CN 200710301536A CN 101183090 A CN101183090 A CN 101183090A
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- chromatographic column
- column
- detection system
- pressure drop
- low flow
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- 241000208125 Nicotiana Species 0.000 title claims abstract description 13
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000001514 detection method Methods 0.000 title claims description 28
- 230000001105 regulatory effect Effects 0.000 title claims description 10
- 238000013016 damping Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000012159 carrier gas Substances 0.000 abstract description 19
- SNICXCGAKADSCV-JTQLQIEISA-N (-)-Nicotine Chemical compound CN1CCC[C@H]1C1=CC=CN=C1 SNICXCGAKADSCV-JTQLQIEISA-N 0.000 abstract description 9
- 229960002715 nicotine Drugs 0.000 abstract description 9
- SNICXCGAKADSCV-UHFFFAOYSA-N nicotine Natural products CN1CCCC1C1=CC=CN=C1 SNICXCGAKADSCV-UHFFFAOYSA-N 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 235000019505 tobacco product Nutrition 0.000 description 1
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- Treatment Of Liquids With Adsorbents In General (AREA)
Abstract
The present invention discloses a device and a method for adjusting the flow distribution of a tobacco detecting system. The device consists of a sample inlet, a pre-column, a T-shaped pipe, a high flow speed chromatographic column and a low flow speed chromatographic column. The two chromatographic columns are respectively connected with a detector. The three ports of the T-shaped pipe are respectively connected with the pre-column, the high flow speed chromatographic column and the low flow speed chromatographic column. A device used for adjusting pressure drop is arranged between the T-shaped pipe and the low flow speed chromatographic column. The adjusting method realizes the change of a split ratio by using the device and enlarging the pressure drop of the low flow speed chromatographic column. The present invention can shorten the detecting cycle of nicotine and water, increase the detecting efficiency and reduce the use quantity of carrier gas.
Description
Technical field
The present invention relates to the detection of tobacco product, specifically, the present invention is a kind of apparatus and method of regulating the assignment of traffic of tobacco detection system.
Background technology
At present, the simple two packed column detection systems of single sample introduction that adopt the shunting of T type pipe, as shown in Figure 1, because the carrier gas split ratio is regulated according to two post pressure drops oneself, therefore the overall flow rate of carrier gas can only be controlled and two packing chromatography column flow rates can not be controlled respectively, therefore thereby produce following defective: the pressure drop ratio of (1) different packed columns generally approaches 0.85～1.15, only adopts T type pipe to carry out and when connecing, its flow rate of carrier gas is than also approaching 1.15: 1～0.85: 1.But when different pillars carried out constituent analysis, its optimum detection flow velocity had very big-difference.Owing to can not control separately, the flow velocity that therefore can only regulate the relatively poor post of carrier gas overall flow rate guarantee separating effect reaches requirement, promptly need adopt lower flow rate of carrier gas, thereby may be prolonged greatly the detection time of another chromatographic column now.(2) same relation owing to the flow rate of carrier gas ratio, raise the efficiency can only be to improve total flow rate of carrier gas, and is not only the flow velocity that improves that long chromatographic column of sense cycle, thereby the carrier gas consumption is strengthened.Thereby, the two packed column detection systems of single sample introduction of present simple employing T type pipe shunting, speed is slower, and efficient is lower.
Summary of the invention
The present invention has overcome above-mentioned shortcoming, has proposed a kind of apparatus and method of regulating the assignment of traffic of tobacco detection system.
The present invention solves the technical scheme that its technical matters takes:
A kind of device of regulating the assignment of traffic of tobacco detection system, this device is made up of injection port, pre-column, T type pipe, high flow rate chromatographic column and low flow velocity chromatographic column, two chromatographic columns are connected with detecting device respectively, three ports of T type pipe link to each other with pre-column, high flow rate chromatographic column and low flow velocity chromatographic column respectively, are provided with the device of an adjusting pressure drop between T type pipe and low flow velocity chromatographic column.
The device of above-mentioned adjusting pressure drop is the damping variable valve, or the corner metering valve.
A kind of method of regulating the assignment of traffic of tobacco detection system is characterized in that, uses the device of the assignment of traffic of above-mentioned adjusting tobacco detection system, and by increasing the pressure drop of described low flow velocity chromatographic column, realizes the variation of split ratio.
The invention has the advantages that: the present invention can shorten the sense cycle of nicotine and water, improves detection efficiency, reduces the carrier gas use amount.
Description of drawings
Fig. 1 is the structural representation of the two packed column detection systems of existing single sample introduction.
Fig. 2 is the effect chromatogram that the described detection system of the existing Fig. 1 of utilization detects flue gas and moisture content.
Fig. 3 is that the described detection system of the existing Fig. 1 of utilization detects flue gas and moisture content and improved the effect chromatogram of total flow rate of carrier gas.
Fig. 4 is the structural representation of the embodiment of the invention 1.
Fig. 5 is the detection effect chromatogram of the embodiment of the invention 1.
Description of reference numerals: 1. injection port; 2. pre-column; 3. low flow velocity chromatographic column; 4. high flow rate chromatographic column; 5. detecting device; 6. corner metering valve; 7.T type pipe.
Embodiment
Comparative Examples 1
Detection with nicotine, moisture in the flue gas is that example describes below: (1) under 170 ℃ of furnace temperature, when column flow rate is 30mL/min, the pressure drop mean value of three nicotine posts is 32.6Psi, and the pressure drop mean value of three moisture posts then is 30.7Psi.After adopting T type pipe and connecing, under 170 ℃ of furnace temperature, when total flow rate of carrier gas is 60mL/min, the flow rate of carrier gas of nicotine post and moisture post is respectively 29.0mL/min, 30.7mL/min.But the sense cycle of the nicotine but sense cycle than moisture is long, and its value is respectively 5.5min and 3.2min (testing result is seen Fig. 2) under above-mentioned testing conditions.
Comparative Examples 2
Only having adopted under the simple and situation about connecing of T type pipe, be to improve detection efficiency, have only total flow rate of carrier gas of raising.When bringing up to 90mL/min, just the sense cycle with nicotine shortens to 4.2min, and this moment, the sense cycle of moisture was the 3.4min (see figure 3).At this moment the carrier gas consumption has improved 1.5 times.On the other hand, it is overlapping not occur peak shape for water content detection as yet in this short sense cycle, but then may be because peak and peak-to-peak interval time of shortening for the detection of some component, it is overlapping and can't adopt this mode to realize the shortening of whole sense cycle peak shape to have occurred.
As shown in Figure 4, this device is made up of injection port 1, pre-column 2, T type pipe 7, high flow rate chromatographic column 4 and low flow velocity chromatographic column 3, two chromatographic columns 3 and 4 are connected with detecting device 5 respectively, three ports of T type pipe 7 link to each other with pre-column 2, high flow rate chromatographic column 4 and low flow velocity chromatographic column 3 respectively, are provided with the device of an adjusting pressure drop between T type pipe 7 and low flow velocity chromatographic column 3.
The device of regulating pressure drop adopts 1/8 inch corner metering valve 6, and this corner metering valve 6 is produced model by Swagelok Marketing Co.: 10-97 CP MS-CRD-0018.
Being connected on needs the preceding (see figure 5) of the lower packed column of flow rate of carrier gas 3 (as the moisture post), by increasing the pressure drop of this side packed column, realize the variation of split ratio, thereby the gas velocity that reaches the both sides chromatographic column reaches oneself requirement separately.Detection with moisture in the flue gas and nicotine is an example, by regulating the pressure drop that the damping variable valve strengthens moisture post one side, make under the constant situation of identical total flow rate of carrier gas (60mL/min), the time of nicotine analysis shortens to 4.5min, the sample detection cycle when not adopting the damping variable valve during carrier gas flux 90mL/min is close, the carrier gas consumption is then saved (see figure 4) greatly, has realized adopting the purpose and the effect of this gas flow modulation mode.
More than the apparatus and method of the assignment of traffic of adjusting tobacco detection system provided by the present invention are described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (4)
1. device of regulating the assignment of traffic of tobacco detection system, this device is made up of injection port, pre-column, T type pipe, high flow rate chromatographic column and low flow velocity chromatographic column, two chromatographic columns are connected with detecting device respectively, three ports of T type pipe link to each other with pre-column, high flow rate chromatographic column and low flow velocity chromatographic column respectively, it is characterized in that: the device that is provided with an adjusting pressure drop between T type pipe and low flow velocity chromatographic column.
2. the device of the assignment of traffic of adjusting tobacco detection system according to claim 1 is characterized in that: the device of described adjusting pressure drop is the damping variable valve.
3. the device of the assignment of traffic of adjusting tobacco detection system according to claim 1 is characterized in that: the device of described adjusting pressure drop is the corner metering valve.
4. a method of regulating the assignment of traffic of tobacco detection system is characterized in that, uses any described device of claim 1 to 3, and by increasing the pressure drop of described low flow velocity chromatographic column, realizes the variation of split ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007103015367A CN101183090A (en) | 2007-12-25 | 2007-12-25 | Apparatus and method for regulating flow quantity distribution of tobacco detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007103015367A CN101183090A (en) | 2007-12-25 | 2007-12-25 | Apparatus and method for regulating flow quantity distribution of tobacco detection system |
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| Publication Number | Publication Date |
|---|---|
| CN101183090A true CN101183090A (en) | 2008-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007103015367A Pending CN101183090A (en) | 2007-12-25 | 2007-12-25 | Apparatus and method for regulating flow quantity distribution of tobacco detection system |
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| CN (1) | CN101183090A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105188907B (en) * | 2013-03-19 | 2017-02-08 | 株式会社日立高新技术 | Liquid feeder and chemical analyzer including same |
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2007
- 2007-12-25 CN CNA2007103015367A patent/CN101183090A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105188907B (en) * | 2013-03-19 | 2017-02-08 | 株式会社日立高新技术 | Liquid feeder and chemical analyzer including same |
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Open date: 20080521 |