CN216350570U - Device for directly measuring non-methane total hydrocarbon with low concentration - Google Patents
Device for directly measuring non-methane total hydrocarbon with low concentration Download PDFInfo
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- CN216350570U CN216350570U CN202122380882.7U CN202122380882U CN216350570U CN 216350570 U CN216350570 U CN 216350570U CN 202122380882 U CN202122380882 U CN 202122380882U CN 216350570 U CN216350570 U CN 216350570U
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 107
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 33
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 32
- 239000004215 Carbon black (E152) Substances 0.000 title claims description 11
- 239000012159 carrier gas Substances 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 42
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 63
- 239000007924 injection Substances 0.000 claims description 63
- 238000005259 measurement Methods 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 12
- 238000004458 analytical method Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 239000003570 air Substances 0.000 description 12
- 239000000126 substance Substances 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- -1 methane hydrocarbons Chemical class 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of methane detection, in particular to a device for directly detecting non-methane total hydrocarbons at low concentration, which effectively improves the trailing phenomenon of peak emergence, improves the accuracy and improves the practicability; including first lead to the ooze valve, the second leads to the ooze valve, the appearance gas port, the ration ring, flow sensor, first carrier gas port, the methane post, first gas outlet, the second carrier gas port, the FID detector, empty tubular column, the third carrier gas port, the enrichment pipe, the fourth carrier gas port, second gas outlet and communicating pipe, be connected through communicating pipe between first lead to the ooze valve and the second lead to the ooze valve, the appearance gas port, the ration ring, flow sensor, first carrier gas port, the methane post, first gas outlet, the second carrier gas port, the FID detector, empty tubular column and third carrier gas port are connected with first lead to the ooze valve through communicating pipe respectively, the enrichment pipe, fourth carrier gas port and second gas outlet pass through communicating pipe with the second lead to the ooze valve respectively and are connected.
Description
Technical Field
The utility model relates to the technical field of methane detection, in particular to a device for directly detecting non-methane total hydrocarbons at low concentration.
Background
The environmental protection sector is in need of on-line continuous monitoring of volatile organic pollutants (VOC for short) in the ambient air surrounding more and more industrial parks. The guidelines of technical regulations (trial) for continuous automatic monitoring of non-methane hydrocarbons in ambient air, introduced by the central office of environmental monitoring in china at 2021/year.
Because the concentration of ambient air is very low, instrument equipment cannot be directly measured, sample gas is extracted for a period of time by adopting an enrichment tube for low-temperature enrichment and a high-temperature flash evaporation thermal analysis mode, the monitored VOC component is captured in the enrichment tube, and then is reversely blown to a chromatographic column for separation by an instant heating and temperature rise mode, and finally is sent to a detector for analyzing a concentration result; when high-carbon non-methane total hydrocarbons are separated and re-measured by a chromatographic column, serious peak tailing and poor peak shape are easily shown, so that the peak searching accuracy is influenced
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a device and a method for directly measuring non-methane total hydrocarbon at low concentration, which effectively improve the tailing phenomenon of the peak, improve the accuracy and improve the practicability.
The utility model discloses a device for directly measuring non-methane total hydrocarbons with low concentration, which comprises a first multi-way sample injection valve, a second multi-way sample injection valve, a sample gas port, a quantitative ring, a flow sensor, a first gas carrier port, a methane column, a first gas outlet, a second gas carrier port, an FID detector, an empty pipe column, a third gas carrier port, an enrichment pipe, a fourth gas carrier port, a second gas outlet and a communicating pipe.
The device for directly measuring the non-methane total hydrocarbons at low concentration further comprises a first electromagnetic valve and a second electromagnetic valve, wherein the first electromagnetic valve is arranged on a communicating pipe with a fourth gas carrier and a second multi-way sample injection valve connected, and the second electromagnetic valve is arranged on a communicating pipe with a second gas outlet and a second multi-way sample injection valve connected.
The utility model relates to a device for directly measuring non-methane total hydrocarbons with low concentration, wherein a fourteen-way valve is adopted as a first multi-way sample injection valve, and interfaces of the fourteen-way valve are named A1-A14 respectively.
The utility model relates to a device for directly measuring non-methane total hydrocarbons with low concentration, wherein a six-way valve is adopted as a second multi-way sample injection valve, and interfaces of the six-way valve are named as B1-B6 respectively.
The utility model relates to a device for directly measuring non-methane total hydrocarbon with low concentration, which is characterized in that the detection of the device for directly measuring non-methane total hydrocarbon with low concentration is divided into four states of sampling enrichment, high-temperature analysis, sample introduction measurement and back flushing cleaning.
The device for directly measuring the non-methane total hydrocarbons at low concentration further comprises an air pump, and the output end of the flow sensor is connected with the input end of the air pump.
The utility model relates to a device for directly measuring non-methane total hydrocarbon with low concentration.
According to the device for directly measuring the non-methane total hydrocarbons with low concentration, the communicating pipe is connected with other components through the flange.
Compared with the prior art, the utility model has the beneficial effects that:
sampling is carried out through a quantitative ring, and the separation of the PQ type chromatographic packed column enters a detector for measurement. By utilizing the characteristic that methane is not easy to be enriched and adopting a special filler enrichment pipe, the aim of only enriching non-methane total hydrocarbons can be achieved. The measurement is made by directly entering the detector with an empty string. The method can effectively improve the tailing phenomenon of the peak, improve the accuracy and improve the practicability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic representation of the sample enrichment state of the present invention;
FIG. 3 is a schematic view of the high temperature desorption state of the present invention;
FIG. 4 is a schematic view of the sample measurement state of the present invention;
FIG. 5 is a schematic view of the back flushing cleaning state of the present invention;
in the drawings, the reference numbers: 1. a first multi-way sample injection valve; 2. a second multi-way sample injection valve; 3. a sample gas port; 4. a dosing ring; 5. a flow sensor; 6. a first carrier port; 7. a methane column; 8. a first air outlet; 9. a second carrier gas port; 10. a FID detector; 11. empty pipe column; 12. a third carrier gas port; 13. an enrichment pipe; 14. a fourth carrier gas port; 15. a first solenoid valve; 16. a second air outlet; 17. a second solenoid valve.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
As shown in figures 1 to 5, the device for directly measuring non-methane total hydrocarbon with low concentration of the utility model comprises a first multi-way sample injection valve 1, a second multi-way sample injection valve 2, a sample gas port 3, a quantitative ring 4, a flow sensor 5, a first gas carrying port 6, a methane column 7, a first gas outlet 8, a second gas carrying port 9, an FID detector 10, an empty pipe column 11 and a third gas carrying port 12, enrichment pipe 13, fourth carrier gas mouth 14, second gas outlet 16 and communicating pipe, connect through communicating pipe between first multi-way injection valve 1 and the second multi-way injection valve 2, appearance gas port 3, ration ring 4, flow sensor 5, first carrier gas mouth 6, methane column 7, first gas outlet 8, second carrier gas mouth 9, FID detector 10, empty tubular column 11 and third carrier gas mouth 12 are connected with first multi-way injection valve 1 through communicating pipe respectively, enrichment pipe 13, fourth carrier gas mouth 14 and second gas outlet 16 pass through communicating pipe with second multi-way injection valve 2 respectively and are connected.
Preferably, the multi-way sampling device further comprises a first electromagnetic valve 15 and a second electromagnetic valve 17, wherein the first electromagnetic valve 15 is installed on a communicating pipe connecting the fourth air port 14 and the second multi-way sampling valve 2, and the second electromagnetic valve 17 is installed on a communicating pipe connecting the second air port 16 and the second multi-way sampling valve 2.
Preferably, the first multi-way sample injection valve 1 is a fourteen-way valve, and each interface of the fourteen-way valve is named as a1-a 14.
Preferably, the second multi-way injection valve 2 is a six-way valve, and each interface of the six-way valve is named as B1-B6.
Preferably, the detection of the low-concentration direct-measurement non-methane total hydrocarbon device is divided into four states of sampling enrichment, high-temperature analysis, sample injection measurement and back flushing cleaning.
As a preferable mode of the above embodiment, the flow sensor further comprises an air pump, and an output end of the flow sensor 5 is connected to an input end of the air pump.
Preferably, in the above embodiment, the input end of the sample port 3 is provided with a filter plate.
Preferably, in the above embodiment, the communication pipe is connected to another component via a flange.
Preferably, the detection of the low-concentration direct measurement non-methane total hydrocarbon device comprises the following steps:
the steps of sampling the enriched state are as follows:
s1, resetting the first multi-way sample injection valve 1, and resetting the second multi-way sample injection valve 2;
s2, cooling the temperature of the enrichment pipe 13 to below 30 ℃, enabling the sample gas to enter the quantitative ring 4 through the sample gas port 3 and the A13 and A12 ports of the first multi-way sample valve 1 by the air extracting pump, enabling the sample gas to enter the enrichment pipe 13 from the A5 and A2 ports of the first multi-way sample valve 1 to the B5 and B4 ports of the second multi-way sample valve 2, enabling the sample gas to enter the A1 and A14 ports of the first multi-way sample valve 1 to the flow sensor 5 through the B1 and B6 ports of the second multi-way sample valve 2 for quantitative sampling and enrichment, and stopping sampling after the set requirement is met;
s3, reversely purging the methane column 7 by the carrier gas 1 through the first carrier gas port 6 through the ports A11 and A10 of the first multi-way injection valve 1, discharging non-methane total hydrocarbons in the methane column 7 through the ports A6 and A7 of the first multi-way injection valve 1, and preparing for the next measurement;
s4, the carrier gas 2 directly enters the FID detector 10 through the second carrier gas port 9 via the ports A8 and A9 of the first multi-way injection valve 1, and the carrier gas entering the detector is kept unchanged;
s5, the carrier gas 3 enters the empty column 11 through the third carrier gas port 12 through the ports A2 and A3 of the first multi-way injection valve 1, and the substances in the empty column 11 are blown into the FID detector 10 for analysis;
s6, the first electromagnetic valve 15 and the second electromagnetic valve 17 are closed, and the fourth air carrying port 14 stops working;
s7, after the sampling of the enrichment pipe 13 reaches a set value, entering a high-temperature analysis state;
the procedure for resolving the state at high temperature is as follows:
s1, resetting the first multi-way sample injection valve 1, and switching the second multi-way sample injection valve 2;
s2, the first electromagnetic valve 15 and the second electromagnetic valve 17 are closed, the fourth gas carrying port 14 stops working, the temperature of the enrichment pipe 13 rises to 270 ℃, the air pump stops working, the quantitative ring 4 performs pressure balance, and redundant pressure is released;
s3, the carrier gas 1 continuously passes through the ports A11 and A10 of the first multi-way injection valve 1 through the first carrier gas port 6 to reversely purge the methane column 7, and non-methane total hydrocarbons in the methane column 7 are discharged through the ports A6 and A7 of the first multi-way injection valve 1 to prepare for the next measurement;
s4, the carrier gas 2 continuously enters the FID detector 10 through the second carrier gas port 9 through the ports A8 and A9 of the first multi-way injection valve 1, and the carrier gas entering the FID detector 10 is kept unchanged;
s5, the carrier gas 3 continuously enters the empty column 11 through the third carrier gas port 12 through the ports A2 and A3 of the first multi-way injection valve 1, and the substances in the empty column 11 are blown into the FID detector 10 for analysis;
s6, entering a sample injection measurement state after the analysis is finished;
the steps of sample injection and state measurement are as follows:
s1, resetting the first multi-way sample injection valve 1, and switching the second multi-way sample injection valve 2;
s2, the first electromagnetic valve 15 and the second electromagnetic valve 17 are closed, the fourth air carrying port 14 stops working, and the enrichment pipe 13 is kept at 270 ℃;
s3, enabling the carrier gas 1 to pass through ports A11 and A12 of the first multi-way injection valve 1 to enable VOCs components in the quantitative ring 4 to enter a methane column 7 through ports A5 and A6 of the first multi-way injection valve 1, separating methane, and sending the separated methane into an FID detector 10 through ports A10 and A9 of the first multi-way injection valve 1 for measurement and analysis;
s4, directly discharging the carrier gas 2 through the ports A8 and A7 of the first multi-way injection valve 1;
s5, the carrier gas 3 continuously enters the ports B6 and B1 of the second multi-way injection valve 2 to the enrichment pipe 13 through the ports A2 and A1 of the first multi-way injection valve 1, the non-methane total hydrocarbons in the enrichment enter the ports A4 and A3 of the first multi-way injection valve 1 through the ports B4 and B5 of the second multi-way injection valve 2 and are sent into an empty column, and the substances in the empty column 11 are blown into the FID detector 10 for analysis;
s6, after the measurement is finished, entering a back flushing cleaning state;
the steps of the back flushing cleaning state are as follows:
s1, resetting the first multi-way sample injection valve 1, and resetting the second multi-way sample injection valve 2;
s2, first solenoid valve 15, second solenoid valve 17 open, and enrichment tube 13 is maintained at 270 ℃. The carrier gas 4 enters the ports B2 and B1 of the second multi-way injection valve 2 from the first electromagnetic valve 15 to the enrichment tube 13, is subjected to reverse aging cleaning, and then flows out of the ports B4 and B3 of the second multi-way injection valve 2 from the second electromagnetic valve 17;
s3, the carrier gas 1 continuously passes through the ports A11 and A12 of the first multi-way injection valve 1, VOCs components in the quantitative ring 4 enter the methane column 7 through the ports A5 and A6 of the first multi-way injection valve 1, and after methane is separated, the methane is sent to the FID detector 10 through the ports A10 and A9 of the first multi-way injection valve 1 for measurement and analysis;
s4, directly discharging the carrier gas 2 through the ports A8 and A7 of the first multi-way injection valve 1;
s5, the carrier gas 3 continuously enters the B6 and B5 ports of the second multi-way injection valve 2 through the A2 and A1 ports of the first multi-way injection valve 1 to the A4 and A3 ports of the first multi-way injection valve 1 and is sent into the empty column 11, and the substances in the empty column 11 are blown into the FID detector 10 for analysis;
and S6, entering a sampling enrichment state after aging is completed.
The installation mode, the connection mode or the arrangement mode of the device for directly measuring the non-methane total hydrocarbon with low concentration are common mechanical modes, and the device can be implemented as long as the beneficial effects of the device can be achieved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a device of non-methane total hydrocarbon is directly surveyed to low concentration, its characterized in that, including first lead to injection valve (1), second lead to injection valve (2) more, appearance gas port (3), ration ring (4), flow sensor (5), first carrier gas mouth (6), methane post (7), first gas outlet (8), second carrier gas mouth (9), FID detector (10), empty pipe post (11), third carrier gas mouth (12), enrichment pipe (13), fourth carrier gas mouth (14), second gas outlet (16) and communicating pipe, be connected through communicating pipe between first lead to injection valve (1) and the second lead to injection valve (2), appearance gas port (3), ration ring (4), flow sensor (5), first carrier gas mouth (6), methane post (7), first gas outlet (8), second carrier gas mouth (9), FID detector (10), An empty pipe column (11) and a third gas carrying port (12) are respectively connected with a first multi-way sample injection valve (1) through communicating pipes, and an enrichment pipe (13), a fourth gas carrying port (14) and a second gas outlet (16) are respectively connected with a second multi-way sample injection valve (2) through communicating pipes.
2. The device for directly measuring the non-methane total hydrocarbons with low concentration according to claim 1, further comprising a first solenoid valve (15) and a second solenoid valve (17), wherein the first solenoid valve (15) is installed on a communicating pipe connecting the fourth gas carrier port (14) and the second multi-way sample injection valve (2), and the second solenoid valve (17) is installed on a communicating pipe connecting the second gas outlet (16) and the second multi-way sample injection valve (2).
3. The device for directly measuring the non-methane total hydrocarbons with low concentration according to claim 1, wherein the first multi-way injection valve (1) adopts a fourteen-way valve, and each interface of the fourteen-way valve is named as A1-A14.
4. The device for directly measuring the non-methane total hydrocarbons with low concentration as claimed in claim 1, wherein the second multi-way injection valve (2) is a six-way valve, and each port of the six-way valve is named as B1-B6.
5. The device for directly measuring the non-methane total hydrocarbons with the low concentration according to claim 1, wherein the detection of the device for directly measuring the non-methane total hydrocarbons with the low concentration is divided into four states of sampling enrichment, high temperature analysis, sample injection measurement and back flushing cleaning.
6. The device for directly measuring the non-methane total hydrocarbons with low concentration as claimed in claim 5, further comprising an air pump, wherein the output end of the flow sensor (5) is connected with the input end of the air pump.
7. The device for directly measuring the non-methane total hydrocarbons with low concentration as claimed in claim 5, wherein the input end of the sample gas port (3) is provided with a filter plate.
8. The apparatus for direct measurement of non-methane total hydrocarbons at low concentration according to claim 5, wherein the communicating pipe is connected to other components by a flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122380882.7U CN216350570U (en) | 2021-09-29 | 2021-09-29 | Device for directly measuring non-methane total hydrocarbon with low concentration |
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|---|---|---|---|
| CN202122380882.7U CN216350570U (en) | 2021-09-29 | 2021-09-29 | Device for directly measuring non-methane total hydrocarbon with low concentration |
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| CN216350570U true CN216350570U (en) | 2022-04-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118688338A (en) * | 2024-06-20 | 2024-09-24 | 武汉天虹环保科技有限责任公司 | A direct measurement device and analysis method for methane and non-methane total hydrocarbons in ambient air |
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2021
- 2021-09-29 CN CN202122380882.7U patent/CN216350570U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118688338A (en) * | 2024-06-20 | 2024-09-24 | 武汉天虹环保科技有限责任公司 | A direct measurement device and analysis method for methane and non-methane total hydrocarbons in ambient air |
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