CN113917054A - Device for automatically measuring atmosphere trace-level VOC (volatile organic compound) components - Google Patents
Device for automatically measuring atmosphere trace-level VOC (volatile organic compound) components Download PDFInfo
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 85
- 239000012159 carrier gas Substances 0.000 claims abstract description 39
- 238000004458 analytical method Methods 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims description 48
- 239000000428 dust Substances 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims 1
- 238000005070 sampling Methods 0.000 abstract description 17
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 29
- 238000005259 measurement Methods 0.000 description 14
- 239000000126 substance Substances 0.000 description 12
- 239000012535 impurity Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000010926 purge Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000002076 thermal analysis method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
- G01N30/08—Preparation using an enricher
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
- G01N30/14—Preparation by elimination of some components
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Abstract
The invention relates to the technical field of VOCs detection, in particular to a device for automatically measuring an atmospheric trace VOC component, which adopts a double enrichment pipe alternative working mode to automatically measure, can greatly shorten the sampling period and improve the real-time property and reliability of data; including filter mechanism, first multi-way valve, first enrichment pipe, second enrichment pipe, MFC flowmeter, the air pump, the second multi-way valve, the carrier gas export, the second two-way valve, the carrier gas entry, first two-way valve, the VOCs analysis column, VOCs pre-separation post, FID detector and a plurality of groups communicating pipe, filter mechanism passes through communicating pipe and first multi-way valve intercommunication, first enrichment pipe passes through communicating pipe and first multi-way valve intercommunication, second enrichment pipe passes through communicating pipe and first multi-way valve intercommunication, the MFC flowmeter passes through communicating pipe and first multi-way valve intercommunication, the air pump passes through communicating pipe and flowmeter intercommunication, the second multi-way valve passes through communicating pipe and first multi-way valve intercommunication.
Description
Technical Field
The invention relates to the technical field of VOCs detection, in particular to a device for automatically measuring an atmospheric trace VOC component.
Background
In order to implement the environmental protection law of the people's republic of China and the air pollution prevention and treatment law of the people's republic of China, prevent and treat environmental pollution, improve environmental quality and strengthen the control and management of the unorganized emission of VOCs. The method has the advantages that the requirements of unstructured discharge control of VOCs material storage, unstructured discharge control of VOCs material transfer and transportation, unstructured discharge control of VOCs in the technological process, VOCs leakage control of equipment and pipeline assemblies, unstructured discharge control of VOCs on open liquid level, and VOCs unstructured discharge waste gas collection and treatment system requirements, and pollution monitoring requirements in and around enterprise factories are stipulated. The ministry of ecological environment of China especially provides GB37822-2019 standards for the unorganized emission control of volatile organic compounds.
The unorganized emission concentration is very low, so that instruments and equipment cannot be directly measured, the enrichment tube must be adopted for low-temperature enrichment, the high-temperature flash evaporation thermal analysis mode is adopted, sample gas is extracted for a period of time, the monitored VOC component is captured in the enrichment tube, then the sample gas is reversely blown to a chromatographic column for separation in an instant heating and temperature rise mode, and finally the sample gas is sent to a detector for analyzing the concentration result.
Most of products on the market are collected by using a single enrichment tube, and the measurement period is long, and is usually 15-30 min. Data cannot be reflected in a short time, the reliability and the real-time performance of the data are greatly reduced, and effective tracking cannot be realized.
Disclosure of Invention
In order to solve the technical problems, the invention provides the device for automatically measuring the atmospheric trace VOC component, which adopts the double enrichment pipes to work in an alternating mode, automatically measures, can greatly shorten the sampling period, and improves the real-time performance and reliability of data.
The invention relates to a device for automatically measuring an atmospheric trace VOC component, which comprises a filtering mechanism, a first multi-way valve, a first enrichment pipe, a second enrichment pipe, an MFC flowmeter, an air pump, a second multi-way valve, a carrier gas outlet, a second two-way valve, a carrier gas inlet, a first two-way valve, a VOCs analysis column, a VOCs pre-separation column, an FID detector and a plurality of groups of communicating pipes, wherein the filtering mechanism is communicated with the first multi-way valve through the communicating pipes, the first enrichment pipe is communicated with the first multi-way valve through the communicating pipes, the second enrichment pipe is communicated with the first multi-way valve through the communicating pipes, the MFC flowmeter is communicated with the first multi-way valve through the communicating pipes, the air pump is communicated with the MFC flowmeter through the communicating pipes, the second multi-way valve is communicated with the first multi-way valve through the communicating pipes, the carrier gas outlet is communicated with the second multi-way valve through the communicating pipes, and the second two-way valve is arranged on the communicating pipes between the carrier gas outlet and the second multi-way valve, the carrier gas inlet is communicated with the second multi-way valve through a communicating pipe, the first two-way valve is arranged on the communicating pipe between the carrier gas inlet and the second multi-way valve, the VOCs analysis column is communicated with the second multi-way valve through the communicating pipe, the FID detector is communicated with the VOCs analysis column through the communicating pipe, and the VOCs pre-separation column is communicated with the second multi-way valve through the communicating pipe.
The invention discloses a device for automatically measuring an atmospheric trace VOC component, which comprises a filter box, a box cover, an air inlet pipe, a base, a first fixed seat, a dust filtering bag, a second fixed seat, a reverse hopper and an exhaust pipe, wherein a cavity is arranged in the filter box, the box cover is installed on the filter box, the air inlet pipe is installed on the filter box and communicated with the cavity, the base is installed at the bottom of the cavity of the filter box, the first fixed seat is connected with the base in a sliding mode, the dust filtering bag is installed on the first fixed seat and the second fixed seat, the second fixed seat is installed on the box cover, the reverse hopper is installed on the box cover and communicated with the dust filtering bag, and the exhaust pipe is installed on the reverse hopper.
According to the device for automatically measuring the VOC component with the atmospheric trace level, the first multi-way valve and the second multi-way valve are all ten-way valves, interfaces of the first multi-way valve are named as A1-A10, and interfaces of the second multi-way valve are named as B1-B10.
According to the device for automatically measuring the atmospheric trace VOC component, the filter box is in a cylindrical shape, and the air inlet pipe is eccentrically arranged on the filter box and is positioned at the lower part of the filter box.
The device for automatically measuring the VOC component with the atmospheric trace level is divided into 6 states when the VOC component is detected.
The invention discloses a device for automatically measuring an atmospheric trace VOC component.
The device for automatically measuring the atmospheric trace VOC component further comprises a pulse pipe and a pulse valve, wherein the pulse pipe is installed on the dumping hopper and communicated with the dust filter bag, and the pulse valve is installed on the pulse pipe.
According to the device for automatically measuring the VOC component at the atmospheric trace level, the communicating pipe and the equipment are connected in a threaded manner or a flange manner.
Compared with the prior art, the invention has the beneficial effects that:
the enrichment pipe is adopted for low-temperature enrichment, the high-temperature flash evaporation thermal analysis mode is adopted, sample gas is extracted for a period of time, the monitored VOC component is captured in the enrichment pipe, then the sample gas is reversely blown to a chromatographic column for separation in an instant heating and temperature rising mode, and finally the sample gas is sent to a detector for analyzing the concentration result, the double enrichment pipes work in an alternative mode for automatic measurement, the sampling period can be greatly shortened, the real-time performance and the reliability of data are effectively improved, the impurities of the gas are filtered by a filtering mechanism, the gas enters a filtering box through an air inlet pipe, the impurities in the gas are filtered by a dust filtering bag, the filtered gas is discharged through a reverse hopper and a discharge pipe, the detection effect of the VOC component is improved, the reversely blown gas is conveyed into the dust filtering bag through a pulse pipe, the dust impurities attached to the dust filtering bag are blown off, the blocking caused by the long-time use of the dust filtering bag is prevented, and the use effect of the automatic measurement atmospheric trace VOC component device is improved, the practicability is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of state one of the present invention;
FIG. 2 is a schematic diagram of the structure of state two of the present invention;
FIG. 3 is a schematic diagram of state three of the present invention;
FIG. 4 is a schematic diagram of state four of the present invention;
FIG. 5 is a schematic diagram of state five of the present invention;
FIG. 6 is a schematic block diagram of state six of the present invention;
FIG. 7 is a schematic view of the filter mechanism of the present invention;
in the drawings, the reference numbers: 1. a filtering mechanism; 2. a first multi-way valve; 3. a first enrichment tube; 4. a second enrichment tube; 5. an MFC flow meter; 6. an air pump; 7. a second multi-way valve; 8. a carrier gas outlet; 9. a second two-way valve; 10. a carrier gas inlet; 11. a first two-way valve; 12. a VOCs analytical column; 13. a VOCs pre-separation column; 14. a FID detector; 15. a filter box; 16. a box cover; 17. an air inlet pipe; 18. a base; 19. a first fixed seat; 20. a dust filter bag; 21. a second fixed seat; 22. dumping; 23. an exhaust pipe; 24. a pulse tube; 25. a pulse 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 invention but are not intended to limit the scope of the invention.
As shown in fig. 1 to 6, the device for automatically measuring the atmospheric trace amount VOC components of the present invention comprises a filtering mechanism 1, a first multi-way valve 2, a first enrichment pipe 3, a second enrichment pipe 4, an MFC flow meter 5, an air pump 6, a second multi-way valve 7, a carrier gas outlet 8, a second two-way valve 9, a carrier gas inlet 10, a first two-way valve 11, a VOCs analysis column 12, a VOCs pre-separation column 13, an FID detector 14 and a plurality of communicating pipes, wherein the filtering mechanism 1 is communicated with the first multi-way valve 2 through a communicating pipe, the first enrichment pipe 3 is communicated with the first multi-way valve 2 through a communicating pipe, the second enrichment pipe 4 is communicated with the first multi-way valve 2 through a communicating pipe, the MFC flow meter 5 is communicated with the first multi-way valve 2 through a communicating pipe, the air pump 6 is communicated with the MFC flow meter 5 through a communicating pipe, the second multi-way valve 7 is communicated with the first multi-way valve 2 through a communicating pipe, the carrier gas outlet 8 is communicated with the second multi-way valve 7 through a communicating pipe, the second two-way valve 9 is arranged on a communicating pipe between the carrier gas outlet 8 and the second multi-way valve 7, the carrier gas inlet 10 is communicated with the second multi-way valve 7 through the communicating pipe, the first two-way valve 11 is arranged on the communicating pipe between the carrier gas inlet 10 and the second multi-way valve 7, the VOCs analysis column 12 is communicated with the second multi-way valve 7 through the communicating pipe, the FID detector 14 is communicated with the VOCs analysis column 12 through the communicating pipe, and the VOCs pre-separation column 13 is communicated with the second multi-way valve 7 through the communicating pipe; the enrichment tube is adopted for low-temperature enrichment, the high-temperature flash evaporation thermal analysis mode is adopted, sample gas is extracted for a period of time, the monitored VOC components are captured in the enrichment tube, then the VOC components are reversely blown to the chromatographic column for separation in the instant heating and temperature rising mode, and finally the VOC components are sent to the detector for analyzing the concentration result.
As a preference of the above embodiment, the filtering mechanism 1 includes a filtering box 15, a box cover 16, an air inlet pipe 17, a base 18, a first fixing seat 19, a dust filtering bag 20, a second fixing seat 21, a reverse hopper 22 and an air outlet pipe 23, a cavity is arranged inside the filtering box 15, the box cover 16 is mounted on the filtering box 15, the air inlet pipe 17 is mounted on the filtering box 15 and communicated with the cavity, the base 18 is mounted at the bottom of the cavity of the filtering box 15, the first fixing seat 19 is slidably connected with the base 18, the dust filtering bag 20 is mounted on the first fixing seat 19 and the second fixing seat 21, the second fixing seat 21 is mounted on the box cover 16, the reverse hopper 22 is mounted on the box cover 16 and communicated with the dust filtering bag 20, and the air outlet pipe 23 is mounted on the reverse hopper 22; in gaseous entering rose box through the intake pipe, the dust filter bag filters the impurity in the gas, and the gas after the filtration is through fill and discharge pipe discharge, increases the detection effect of VOC composition, and reverse air blow gas carries to the dust filter bag in through the pulse tube, blows off adnexed dust impurity on the dust filter bag, prevents that the long-time use of dust filter bag from causing the jam, increases the result of use of automatic measure atmosphere trace level VOC component device, improves the practicality.
Preferably, the first multi-way valve 2 and the second multi-way valve 7 are ten-way valves, the ports of the first multi-way valve 2 are named as A1-A10, and the ports of the second multi-way valve 7 are named as B1-B10.
As a preference of the above embodiment, the filter box 15 is in a cylindrical shape, and the air inlet pipe 17 is eccentrically installed on the filter box 15 and is positioned at the lower part of the filter box 15; through the arrangement, gas entering the filter box is filtered in a spiral ascending mode, the filtering effect of impurities in the gas is improved, and the practicability is improved.
As a preferable example of the above embodiment, the device is divided into 6 states when detecting the VOC components.
As a preference of the above embodiment, a gasket is provided in the base 18.
Preferably, the dust filter further comprises a pulse pipe 24 and a pulse valve 25, wherein the pulse pipe 24 is arranged on the dump bucket 22 and communicated with the dust filter bag 20, and the pulse valve 25 is arranged on the pulse pipe 24.
As a preferable example of the above embodiment, the connection mode between the communication pipe and the device is a screw thread or a flange.
The invention relates to a device for automatically measuring an atmospheric trace VOC component, which is used for automatically measuring 6 states of the atmospheric trace VOC component during working, and comprises the following steps:
the first state:
the first multi-way valve 2 and the second multi-way valve 7 are reset;
the temperature of the second enrichment pipe 4 is reduced to be below 30 ℃, sample gas enters the filtering mechanism 1 under the action of the air pump 6, enters the second enrichment pipe 4 through ports A4 and A5 of the first multi-way valve 2 after filtering is finished, and then quantitatively samples and enriches the sample gas through ports B8 and B9 of the second multi-way valve 7 to the MFC flowmeter 5, and the sampling is stopped after the sampling meets set requirements.
The first two-way valve 11 and the second two-way valve 9 are opened, the first enrichment pipe 3 is heated to 270 ℃, the carrier gas 3 flows through the carrier gas inlet 10, enters the ports B2 and B3 of the second multi-way valve 7, enters the ports A1 and A10 of the first multi-way valve 2 to the first enrichment pipe 3, and then enters the ports B10 and B1 of the second multi-way valve 7 through the ports A3, A2, A7 and A6 of the first multi-way valve 2 to be discharged out of the second two-way valve 9. And (3) carrying out high-temperature back flushing cleaning and aging on the first enrichment pipe 3.
The carrier gas 1 flows through ports B7 and B6 of the second multi-way valve 7 to continuously and completely separate the substances in the VOCs analysis column 12, and the completely separated substances are sent to the FID detector 14 for analysis and measurement. Purging was continued after the analysis was completed until the next analysis.
The carrier gas 2 flows out through ports B4 and B5 of the second multi-way valve 7 to ports B9 and B8 of the VOCs pre-separation column 13 to the second multi-way valve 7, and is reversely purged to prepare for measurement.
The second enrichment pipe 4 enters a second state after the sampling amount reaches a set value;
and a second state:
the first multi-way valve 2 is opened and the second multi-way valve 7 is reset;
the temperature of the first enrichment pipe 3 is reduced to be below 30 ℃, sample gas enters the filtering mechanism 1 under the action of the air pump 6, enters the second enrichment pipe 4 through the ports A4 and A3 of the first multi-way valve 2 after filtering is finished, and then quantitatively samples and enriches the sample gas through the ports B10 and B9 of the second multi-way valve 7 to the MFC flowmeter 5, and the sampling is stopped after reaching a set requirement.
And the first two-way valve 11 and the second two-way valve 9 are closed, the second enrichment pipe 4 is heated to 270 ℃, and high-temperature desorption is carried out.
The carrier gas 2 flows out through ports B4 and B5 of the second multi-way valve 7 to ports B9 and B8 of the VOCs pre-separation column 13 to the second multi-way valve 7, and is reversely purged to prepare for measurement.
After the second enrichment pipe 4 reaches the set temperature, continuing for 10s, and entering a third state;
and a third state:
the first multi-way valve 2 is cut, and the second multi-way valve 7 is cut;
the first enrichment pipe 3 continues sampling, sample gas enters the filtering mechanism 1 under the action of the air pump 6, enters the second enrichment pipe 4 through the ports A4 and A3 of the first multi-way valve 2 after filtering is finished, and then quantitatively samples and enriches the sample gas through the ports B10 and B9 of the second multi-way valve 7 to the MFC flowmeter 5, and the sampling is stopped after reaching a set requirement.
And the first two-way valve 11 and the second two-way valve 9 are opened, the carrier gas 3 flows through the first two-way valve 11 to the ports B2 and B1 of the second multi-way valve 7 to the second two-way valve 9, and the purging is performed in the opposite direction and the air is discharged.
The carrier gas 1 is vented through ports B7, B8 of the second multi-way valve 7.
The carrier gas 2 flows through ports B4 and B3 of the second multi-way valve 7 to ports A1, A2, A6 and A7 of the first multi-way valve 2 to the second enrichment pipe 4, the measured substance is reversely pushed into ports A5 and A6 of the first multi-way valve 2 to ports B10 and B9 of the second multi-way valve 7 to enter the VOCs pre-separation column 13 for pre-separation, the substance to be measured is rapidly separated and sent into the VOCs analysis column 12 through ports B5 and B6 of the second multi-way valve 7 for complete separation, and the substance to be measured is sent into the FID detector 14 for analysis and measurement after complete separation.
After all substances to be measured enter the VOCs analysis column 12, entering a state IV;
and a fourth state:
the first multi-way valve 2 keeps the valve cutting state, and the second multi-way valve 7 resets
And the second enrichment pipe 4 is kept in a high-temperature state continuously, the first two-way valve 11 and the second two-way valve 9 are opened, the carrier gas 3 enters the ports A1, A2, A7 and A8 of the first multi-way valve 2 through the ports B3 and B2 of the second multi-way valve 7 and enters the second enrichment pipe 4 for reverse purging, and residual impurities are purged completely to prepare for next measurement.
The first enrichment pipe 3 continues sampling, sample gas enters the filtering mechanism 1 under the action of the air pump 6, enters the second enrichment pipe 4 through the ports A4 and A3 of the first multi-way valve 2 after filtering is finished, and then quantitatively samples and enriches the sample gas through the ports B10 and B9 of the second multi-way valve 7 to the MFC flowmeter 5, and the sampling is stopped after reaching a set requirement.
The carrier gas 2 flows out from the ports B4 and B5 of the second multi-way valve 7 to the ports B9 and B8 of the VOCs pre-separation column 13 to the second multi-way valve 7, and is reversely purged to prepare for the next measurement
The carrier gas 1 flows through ports B7 and B6 of the second multi-way valve 7 to continuously and completely separate the substances in the VOCs analysis column 12, and the completely separated substances are sent to the FID detector 14 for analysis and measurement. Purging was continued after the analysis was completed until the next analysis.
After the analysis is finished and the sampling of the first enrichment pipe 3 reaches the set requirement, entering a fifth state;
and a fifth state:
the first multi-way valve 2 is reset, and the second multi-way valve 7 is kept reset
And the first two-way valve 11 and the second two-way valve 9 are closed, the first enrichment pipe 3 is heated to 270 ℃, and high-temperature desorption is carried out.
The temperature of the second enrichment pipe 4 is reduced to be below 30 ℃, sample gas enters the filtering mechanism 1 under the action of the air pump 6, enters the second enrichment pipe 4 through ports A4 and A5 of the first multi-way valve 2 after filtering is finished, and then quantitatively samples and enriches the sample gas through ports B8 and B9 of the second multi-way valve 7 to the MFC flowmeter 5, and the sampling is stopped after reaching a set requirement.
The carrier gas 2 flows out through ports B4 and B5 of the second multi-way valve 7 to ports B9 and B8 of the VOCs pre-separation column 13 to the second multi-way valve 7, and is reversely purged to prepare for measurement.
Entering a sixth state after the sampling quantity of the second enrichment pipe 4 reaches a set value;
and a sixth state:
the first multi-way valve 2 is kept reset, and the second multi-way valve 7 is cut
And the second enrichment pipe 4 continues sampling, the sample gas enters the filtering mechanism 1 under the action of the air pump 6, enters the second enrichment pipe 4 through the ports A4 and A3 of the first multi-way valve 2 after filtering is finished, and then quantitatively samples and enriches the sample gas through the ports B10 and B9 of the second multi-way valve 7 to the MFC flowmeter 5, and the sampling is stopped after the sampling meets the set requirement.
And the first two-way valve 11 and the second two-way valve 9 are opened, the carrier gas 3 flows through the first two-way valve 11 to the ports B2 and B1 of the second multi-way valve 7 to the second two-way valve 9, and the purging is performed in the opposite direction and the air is discharged.
The carrier gas 1 is vented through ports B7, B8 of the second multi-way valve 7.
The carrier gas 2 flows through ports B4 and B3 of the second multi-way valve 7 to ports A1 and A10 of the first multi-way valve 2 to the first enrichment pipe 3, the measured substances are reversely pushed into ports A3, A2, A7 and A6 of the first multi-way valve 2 to ports B10 and B9 of the second multi-way valve 7 to enter the VOCs pre-separation column 13 for pre-separation, the substances to be measured are rapidly separated and sent into the VOCs analysis column 12 through ports B5 and B6 of the second multi-way valve 7 for complete separation, and the substances to be measured are sent into the FID detector 14 for analysis and measurement after complete separation.
After all the substances to be measured enter the VOCs analytical column 12, the state one is entered.
According to the device for automatically measuring the atmospheric trace VOC component, the installation mode, the connection mode or the arrangement mode are common mechanical modes, and the device can be implemented as long as the beneficial effects of the device can be achieved; the first multi-way valve 2, the first enrichment pipe 3, the second enrichment pipe 4, the MFC flowmeter 5, the air pump 6, the second multi-way valve 7, the second two-way valve 9, the first two-way valve 11, the VOCs analytical column 12, the VOCs pre-separation column 13 and the FID detector 14 of the device for automatically measuring the atmospheric trace-level VOC component are purchased from the market, and technicians in the industry only need to install and operate according to the attached instructions.
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 device for automatically measuring the VOC component of the atmosphere trace level is characterized by comprising a filtering mechanism (1), a first multi-way valve (2), a first enrichment pipe (3), a second enrichment pipe (4), an MFC flowmeter (5), an air pump (6), a second multi-way valve (7), a carrier gas outlet (8), a second two-way valve (9), a carrier gas inlet (10), a first two-way valve (11), a VOCs analysis column (12), a VOCs pre-separation column (13), an FID detector (14) and a plurality of groups of communicating pipes, wherein the filtering mechanism (1) is communicated with the first multi-way valve (2) through the communicating pipes, the first enrichment pipe (3) is communicated with the first multi-way valve (2) through the communicating pipes, the second enrichment pipe (4) is communicated with the first multi-way valve (2) through the communicating pipes, and the MFC flowmeter (5) is communicated with the first multi-way valve (2) through the communicating pipes, the air pump (6) is communicated with the MFC flowmeter (5) through a communicating pipe, the second multi-way valve (7) is communicated with the first multi-way valve (2) through a communicating pipe, the carrier gas outlet (8) is communicated with the second multi-way valve (7) through a communicating pipe, the second two-way valve (9) is installed on the communicating pipe between the carrier gas outlet (8) and the second multi-way valve (7), the carrier gas inlet (10) is communicated with the second multi-way valve (7) through a communicating pipe, the first two-way valve (11) is installed on the communicating pipe between the carrier gas inlet (10) and the second multi-way valve (7), the VOCs analysis column (12) is communicated with the second multi-way valve (7) through a communicating pipe, the FID detector (14) is communicated with the VOCs analysis column (12) through a communicating pipe, and the VOCs pre-separation column (13) is communicated with the second multi-way valve (7) through a communicating pipe.
2. The device for automatically measuring the VOC component at the trace level in the atmosphere as claimed in claim 1, wherein the filtering mechanism (1) comprises a filtering box (15), a box cover (16), an air inlet pipe (17), a base (18), a first fixing seat (19), a dust filtering bag (20), a second fixing seat (21), a dumping hopper (22) and an exhaust pipe (23), a chamber is arranged in the filtering box (15), the box cover (16) is installed on the filtering box (15), the air inlet pipe (17) is installed on the filtering box (15) and communicated with the chamber, the base (18) is installed at the bottom of the chamber of the filtering box (15), the first fixing seat (19) is connected with the base (18) in a sliding manner, the dust filtering bag (20) is installed on the first fixing seat (19) and the second fixing seat (21), and the second fixing seat (21) is installed on the box cover (16), the inverted bucket (22) is installed on the box cover (16) and communicated with the dust filtering bag (20), and the exhaust pipe (23) is installed on the inverted bucket (22).
3. The device for automatically measuring the VOC component with the atmospheric trace level as claimed in claim 1, wherein said first multi-way valve (2) and said second multi-way valve (7) are all ten-way valves, each interface of said first multi-way valve (2) is named as A1-A10, and each interface of said second multi-way valve (7) is named as B1-B10.
4. An apparatus for automatically measuring the content of VOC components at atmospheric trace levels according to claim 2, wherein said filter box (15) has a cylindrical shape, and said intake duct (17) is eccentrically installed on the filter box (15) at a lower portion of the filter box (15).
5. The apparatus for automatically measuring the content of VOC at atmospheric trace levels according to claim 1, wherein said apparatus is divided into 6 states when detecting the VOC content.
6. An apparatus for automatically measuring the content of VOC components at atmospheric levels according to claim 2, wherein a sealing gasket is provided in said base (18).
7. An apparatus for automatically measuring the content of VOC components at atmospheric trace levels according to claim 2, further comprising a pulse tube (24) and a pulse valve (25), said pulse tube (24) being mounted on the hopper (22) and communicating with the dust filter bag (20), said pulse valve (25) being mounted on the pulse tube (24).
8. The apparatus for automatically measuring the content of VOC in the atmosphere with trace amount according to claim 1, wherein the connection means between the communicating tube and the equipment is screw threads or flanges.
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