CN212568651U - Non-methane total hydrocarbon detection device - Google Patents
Non-methane total hydrocarbon detection device Download PDFInfo
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- CN212568651U CN212568651U CN202021163519.9U CN202021163519U CN212568651U CN 212568651 U CN212568651 U CN 212568651U CN 202021163519 U CN202021163519 U CN 202021163519U CN 212568651 U CN212568651 U CN 212568651U
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Abstract
The utility model provides a non-methane total hydrocarbon detection device, which comprises a ten-way valve, a six-way valve and a detector, wherein the ten-way valve and the six-way valve are used for switching a sampling mode, a detection mode and a back flushing mode; the sampling mode comprises a sampling gas circuit consisting of a gas inlet, a ten-way valve, a first quantitative ring, a second quantitative ring and a gas outlet, and the detection mode comprises a total hydrocarbon detection gas circuit and a methane detection gas circuit; and the back flushing mode is that the methane detection gas circuit carries out carrier gas back flushing after being switched by the six-way valve. The utility model discloses a ten logical valves, six logical valve combine the ration ring, can once advance the synchronous separation of back twin columns. And a back flushing mode is set, substances with higher molecular weight in the methane column are back flushed out of the methane column and enter the FID to be combusted, so that the problem of macromolecular residue in the methane column is solved, and NMHC can be accurately analyzed.
Description
Technical Field
The utility model belongs to the technical field of the total hydrocarbon of non-methane detects, especially, relate to a total hydrocarbon detection device of non-methane.
Background
Non-methane total hydrocarbons (NMHC) refers to the sum of other gaseous organic compounds (in terms of carbon) on the hydrogen flame ionization detector that respond, except for methane, and when the concentration of NMHC in the environment reaches a certain level, it is directly dangerous to human health. Currently, the main analysis method adopted in the current national standard for detecting fixed source non-methane total hydrocarbons (NMHC) is a two-color spectral column method, i.e. a hydrogen-hydrogen flame detector (FID) is adopted to analyze the total hydrocarbon content and the methane content respectively. In the analysis process, two samples need to be fed for each analysis, wherein the total hydrocarbon column is used for measuring the total hydrocarbon content, the methane column is used for measuring the methane content, and the difference is the NMHC content. After the methane component is analyzed by the methane column, the rest of most macromolecular samples continuously pass through the methane column and are blown out of the chromatographic column, and the macromolecular samples enter the environment to cause pollution.
Two times of sample injection can cause larger errors, and components with large molecular weight are more remained in a methane column, so that the peak is deformed or a hybrid peak appears in the next measurement, thereby causing poor chromatographic peak shape, poor reproducibility, retention time drift and the like.
SUMMERY OF THE UTILITY MODEL
The utility model discloses adopt the secondary to present total hydrocarbon detection device of non-methane and advance kind and have the methane column to remain, lead to the great technical problem of error, provide one kind and adopt ten logical valve, six-way valve to link together, once advance kind back double-column synchronization separation to the total hydrocarbon detection device of non-methane who has the blowback gas circuit.
In order to achieve the above object, the utility model discloses a technical scheme be:
a non-methane total hydrocarbon detection device comprises a ten-way valve, a six-way valve and a detector, wherein a sampling mode, a detection mode and a back flushing mode are switched through the ten-way valve and the six-way valve; the sampling mode comprises a sampling gas path consisting of a gas inlet, a ten-way valve, a first quantitative ring, a second quantitative ring and a gas outlet, the detection mode comprises a total hydrocarbon detection gas path and a methane detection gas path, the total hydrocarbon detection gas path comprises a first carrier gas inlet, the ten-way valve and a gas path consisting of a total hydrocarbon column, the methane detection gas path comprises a second carrier gas inlet, the ten-way valve, the first quantitative ring, the six-way valve and a gas path consisting of a methane column, and the tail ends of the total hydrocarbon detection gas path and the methane detection gas path are connected to the detector through a three-way valve; and the back flushing mode is that the methane detection gas circuit carries out carrier gas back flushing after being switched by the six-way valve.
Preferably, air resistances are arranged between the tail ends of the total hydrocarbon detection gas circuit and the methane detection gas circuit and the three-way valve.
Preferably, the detector is a FID detector.
Preferably, a water removal device is connected to the sample gas outlet.
Preferably, the detector combustion-supporting gas is hydrogen and hydrocarbon-removed air.
Compared with the prior art, the utility model discloses an advantage lies in with positive effect:
the non-methane total hydrocarbon detection device adopts a ten-way valve and six-way valve connection structure, is combined with a quantitative ring, and can realize double-column synchronous separation after one-time sample introduction.
Realize carrying out the blowback to the methane column through switching six-way valve, with the great molecular weight material blowback play methane column of molecular weight in the methane column, get into the FID and burn, solved the residual problem of macromolecule in the methane column, can accurate analysis NMHC.
The gas circuit is provided with the flameout preventing device, so that the flameout problem of the FID detector caused by switching of the back blowing gas circuit can be effectively solved, and the normal operation of the instrument is ensured.
Drawings
FIG. 1 is a gas circuit diagram of a sampling mode of the non-methane total hydrocarbon detection device of the present invention;
FIG. 2 is a gas circuit diagram of a detection mode of the non-methane total hydrocarbon detection device of the present invention;
FIG. 3 is a back-flushing mode gas circuit diagram of the non-methane total hydrocarbon detecting device of the present invention;
in the above figures: 1. an air inlet; 2. an air outlet; 3. a ten-way valve; 4. a six-way valve; 5. a first quantity of rings; 6. a second dosing ring; 7. a total hydrocarbon column; 8. a methane column; 9. a first air lock; 10. a second air resistance; 11. a three-way valve; 12. a detector.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example (b):
a non-methane total hydrocarbon detection device comprises a ten-way valve, a six-way valve and a FID detector, wherein a sampling mode, a detection mode and a back flushing mode are switched by switching the states of the ten-way valve and the six-way valve, so that double-column synchronous separation after one sample introduction and back flushing cleaning of a methane column are realized.
The sampling mode comprises a sampling gas circuit consisting of a gas inlet, a ten-way valve, a first quantitative ring, a second quantitative ring and a gas outlet, the detection mode comprises a total hydrocarbon detection gas circuit and a methane detection gas circuit, the total hydrocarbon detection gas circuit comprises a first carrier gas inlet, a ten-way valve and a gas circuit consisting of a total hydrocarbon column, the methane detection gas circuit comprises a second carrier gas inlet, a ten-way valve, a first quantitative ring, a six-way valve and a gas circuit consisting of a methane column, and the tail ends of the total hydrocarbon detection gas circuit and the methane detection gas circuit are connected to the detector through a three-way valve. The combustion-supporting gas of the detector is hydrogen and hydrocarbon-removing air, and the combustion-supporting gas is introduced into the detector through a pipeline. And the back flushing mode is that the methane detection gas circuit carries out carrier gas back flushing after being switched by the six-way valve.
Further, the gas resistances are arranged between the tail ends of the total hydrocarbon detection gas circuit and the methane detection gas circuit and the three-way valve, the gas resistances are pipelines with fine apertures, the apertures are different in size, the resistance can be adjusted, and the 16R gas resistance is adopted in the embodiment. The fluctuation of air current arouses the detector to flame out easily, and this embodiment detects the gas circuit and methane at total hydrocarbon and detects the terminal air resistor that all increases of gas circuit, can effectual stable air current, need not to set up compensation gas circuit and solenoid valve, simplifies whole gas circuit.
The sample gas outlet is connected with a water removal device, water vapor in the sample gas is condensed into water drops through the water removal device to be removed, and the water vapor in the sample gas can be effectively prevented from entering parts such as an air pump and the like to cause damage.
As shown in fig. 1, in the sampling mode, the sample gas enters the channel 1 through the channel 2 of the ten-way valve from the gas inlet, then flows through the first quantitative ring, flows through the second quantitative ring after passing through the channel 8 to the channel 7 of the ten-way valve, and finally is discharged through the gas outlet after passing through the channels 4 and 3 of the ten-way valve, and at this time, the first quantitative ring and the second quantitative ring are filled with the sample gas, and sampling is completed.
As shown in fig. 2, after sampling is completed, the ten-way valve enters a detection mode in a switching state, and meanwhile, the chromatographic workstation starts to collect analysis data. The carrier gas 1 enters a channel 4 through a channel 5 of the ten-way valve, flows through a second quantitative ring, enters channels 7 and 6 of the ten-way valve, is blown into a total hydrocarbon column, and then enters an FID detector through a first gas barrier and a three-way valve, and at the moment, a total hydrocarbon peak appears in a chromatographic chart.
The carrier gas 2 enters the first quantitative ring after passing through the channels 10 and 1 of the ten-way valve, then enters the channel 1 of the six-way valve through the channel 8 and the channel 9 of the ten-way valve, enters the methane column through the channel 2 of the six-way valve, then enters the second gas barrier through the 6 channels 5 of the methane column, and finally enters the detector through the three-way valve, and a methane peak appears in a chromatographic chart.
As shown in fig. 3, after a methane peak occurs, the states of the ten-way valve and the six-way valve are switched, and the carrier gas 2 serving as blowback gas enters the channel 1 of the six-way valve after passing through the channels 10 and 9 of the ten-way valve, and then enters the methane column after passing through the channel 6 of the six-way valve to blow back the methane column. Then the blowback gas flows into the detector through the second air lock and the three-way valve to burn after sequentially passing through the channels 2, 3, 4 and 5 of the six-way valve.
The non-methane total hydrocarbon detection device adopts the connection of a ten-way valve and a six-way valve, and can realize the synchronous separation of double columns after one-time sample introduction by combining a quantitative ring. And can carry out the blowback to the methane column through switching six-way valve, with the great molecular weight material blowback play methane column of molecular weight in the methane column, get into the FID and burn, solve the residual problem of macromolecule in the methane column, can accurate analysis NMHC. In addition, the gas circuit is provided with an anti-flameout device, so that the flameout problem of the FID detector caused by switching of the back blowing gas circuit can be effectively solved, and the normal operation of the instrument is ensured.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (5)
1. A non-methane total hydrocarbon detection device, characterized in that: the system comprises a ten-way valve, a six-way valve and a detector, wherein a sampling mode, a detection mode and a back flushing mode are switched by the ten-way valve and the six-way valve; the sampling mode comprises a sampling gas path consisting of a gas inlet, a ten-way valve, a first quantitative ring, a second quantitative ring and a gas outlet, the detection mode comprises a total hydrocarbon detection gas path and a methane detection gas path, the total hydrocarbon detection gas path comprises a first carrier gas inlet, the ten-way valve and a gas path consisting of a total hydrocarbon column, the methane detection gas path comprises a second carrier gas inlet, the ten-way valve, the first quantitative ring, the six-way valve and a gas path consisting of a methane column, and the tail ends of the total hydrocarbon detection gas path and the methane detection gas path are connected to the detector through a three-way valve; and the back flushing mode is that the methane detection gas circuit carries out carrier gas back flushing after being switched by the six-way valve.
2. The non-methane total hydrocarbon detection apparatus according to claim 1, wherein: and air resistances are arranged between the tail ends of the total hydrocarbon detection gas circuit and the methane detection gas circuit and the three-way valve.
3. The non-methane total hydrocarbon detection apparatus according to claim 1, wherein: the detector is a FID detector.
4. The non-methane total hydrocarbon detection apparatus according to claim 2 or 3, wherein: the sample gas outlet is connected with a water removal device.
5. The non-methane total hydrocarbon detection apparatus according to claim 4, wherein: the detector combustion-supporting gas is hydrogen and hydrocarbon-removing air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021163519.9U CN212568651U (en) | 2020-06-19 | 2020-06-19 | Non-methane total hydrocarbon detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021163519.9U CN212568651U (en) | 2020-06-19 | 2020-06-19 | Non-methane total hydrocarbon detection device |
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| CN212568651U true CN212568651U (en) | 2021-02-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115128193A (en) * | 2022-07-21 | 2022-09-30 | 天津津普利环保科技股份有限公司 | Detection device for non-methane total hydrocarbon and benzene series and application thereof |
-
2020
- 2020-06-19 CN CN202021163519.9U patent/CN212568651U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115128193A (en) * | 2022-07-21 | 2022-09-30 | 天津津普利环保科技股份有限公司 | Detection device for non-methane total hydrocarbon and benzene series and application thereof |
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Address after: 266000 No. 1 Xueyue Road, Chengyang District, Qingdao City, Shandong Province Patentee after: Qingdao Zhongrui Intelligent Instrument Co.,Ltd. Address before: 266000 No. 1 Xueyue Road, Chengyang District, Qingdao City, Shandong Province Patentee before: QINGDAO ZHONGRUI INTELLIGENT INSTRUMENT Co.,Ltd. |
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