CN212483473U - Pollution source benzene series monitor - Google Patents
Pollution source benzene series monitor Download PDFInfo
- Publication number
- CN212483473U CN212483473U CN202020998708.1U CN202020998708U CN212483473U CN 212483473 U CN212483473 U CN 212483473U CN 202020998708 U CN202020998708 U CN 202020998708U CN 212483473 U CN212483473 U CN 212483473U
- Authority
- CN
- China
- Prior art keywords
- valve
- case
- gas
- monitor
- analysis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 title claims abstract 9
- 239000007789 gas Substances 0.000 claims abstract description 91
- 238000004458 analytical method Methods 0.000 claims abstract description 37
- 238000005070 sampling Methods 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 239000012159 carrier gas Substances 0.000 claims abstract description 27
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000001257 hydrogen Substances 0.000 claims abstract description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 5
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 5
- 239000003381 stabilizer Substances 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 150000001555 benzenes Chemical class 0.000 description 15
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- LBCHYKTUUMRFHG-UHFFFAOYSA-N 3,5-diphenyl-7-oxabicyclo[2.2.1]hepta-1(6),2,4-triene Chemical compound C=1C(C=2C=CC=CC=2)=C2OC=1C=C2C1=CC=CC=C1 LBCHYKTUUMRFHG-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000005120 petroleum cracking Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Images
Landscapes
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The utility model relates to a pollution sources benzene series monitor, the load simulator comprises a case, analysis constant temperature valve case and electrical apparatus control module, analysis constant temperature valve case and control module set up at quick-witted incasement, analysis constant temperature valve case includes valve box and post case, the valve box is including advancing the type solenoid valve, drive the valve, ten logical sampling valves, dosing pipe and FID detector, it links to each other with ten logical sampling valves to drive the valve, the post case is equipped with the chromatographic column, analysis constant temperature valve case still includes the appearance gas entry, the appearance gas export, the bypass export, the carrier gas entry, hydrogen entry and except hydrocarbon air inlet, analysis constant temperature valve case forms the quantitative sampling gas circuit to ten logical sampling valves control through driving the valve, atmospheric balance gas circuit and detection gas circuit. The utility model has the advantages that: the atmosphere balance gas circuit is arranged, so that the gas pressure balance of the sample gas in the quantitative pipe can be realized, and the precision of a detection result is improved; the later maintenance is convenient; the column box and the valve box are respectively provided with a heating sheet and a temperature sensor, so that the temperature of the valve box and the column box can be independently controlled, and the detection result is more accurate.
Description
Technical Field
The utility model relates to a pollution detection field especially relates to a pollution source benzene series monitor.
Background
The detection of waste gas pollutants has a positive effect on protecting the environment, and benzene series is colorless, light yellow and transparent oily liquid, has strong aromatic gas, is volatile to be steam, and is flammable and toxic. Toluene, xylene and the homologues of benzene are coal tar fractionation or petroleum cracking products. At present, benzene-based compounds have been identified by the world health organization as strong carcinogens.
One of the currently common methods for measuring benzene series in air by a gas chromatograph is to enrich the benzene series in air by using a sampling tube filled with poly (2, 6-diphenyl-p-phenylene ether) (Tenax) at normal temperature, then connect the sampling tube into a thermal desorption apparatus, heat the sampling tube and introduce the adsorbed components into the gas chromatograph with a hydrogen flame ionization detector for analysis. Another method is to use an activated carbon sampling tube to enrich benzene series in the air, analyze the benzene series by carbon disulfide (CS2) and determine and analyze the benzene series by using a gas chromatograph with a hydrogen flame ionization detector. The two methods can not realize the purpose of online real-time monitoring, and the adsorption, analysis and analysis are respectively and independently carried out, so that the period of sample analysis is increased, and the accuracy of the sample is influenced if the sampling tube is operated irregularly in the transportation and storage processes.
Disclosure of Invention
The utility model discloses mainly solved traditional benzene system detection scheme detection cycle length, the problem that can't realize automatic continuous detection provides a simple structure, be convenient for maintain, can carry out automatic continuous detection's pollution sources benzene series thing monitor.
The utility model provides a technical scheme that its technical problem adopted, a pollution source benzene series monitor, including quick-witted case, analysis thermostatic valve case and electrical apparatus control module, analysis thermostatic valve case and control module setting are at quick-witted incasement, analysis thermostatic valve case includes valve box and column box, and the valve box is including advancing the type solenoid valve, drive valve, ten logical sampling valves, dosage tube and FID detector, drive valve and ten logical sampling valves and link to each other, and the column box is equipped with the chromatographic column, analysis thermostatic valve case still includes sample gas entry, sample gas export, bypass export, carrier gas entry, hydrogen entry and except hydrocarbon air entry, and analysis thermostatic valve case forms quantitative sampling gas circuit, atmospheric balance gas circuit and detection gas circuit to ten logical sampling valve control through driving the valve.
The conduction state of the ten-way sampling valve is controlled by the driving valve, the switching of a quantitative sampling gas circuit, an atmosphere balancing gas circuit and a detection gas circuit is realized, the quantitative sampling gas circuit realizes the quantitative acquisition of sample gas by a quantitative pipe, and simultaneously the sample gas participating in a chromatographic column and an FID detector is removed; the atmosphere balancing gas circuit is used for balancing the gas pressure in the quantitative pipe and the atmospheric pressure, so that the accuracy of a detection result is improved; and the detection gas circuit blows the sample gas in the quantitative pipe into the FID detector by using carrier gas for detection.
As a preferable scheme of the scheme, the quantitative sampling gas path sequentially comprises a sample gas inlet, a sample injection electromagnetic valve, a ten-way sampling valve, a quantitative tube and a sample gas outlet.
As a preferable scheme of the scheme, the atmosphere balance gas path sequentially comprises a sample gas inlet, a sample injection solenoid valve and a bypass outlet. When switching into atmosphere balance gas circuit, sample gas export and atmosphere intercommunication for sample gas is balanced with the atmosphere in the ration pipe.
As a preferable scheme of the above scheme, the detection gas path sequentially includes a carrier gas inlet, a ten-way sampling valve, a quantitative tube, a chromatographic column, and an FID detector.
As a preferable proposal of the proposal, the hydrogen inlet and the hydrocarbon-removing air inlet are both connected with the FID detector.
As a preferred scheme of the above scheme, the case comprises a front panel, a rear panel and a partition board, the partition board is connected with the front panel and the rear panel, an analysis thermostatic valve box is arranged on one side of the partition board, an electric appliance control module is arranged on the board surface on the other side of the partition board, the electric appliance control module comprises a main control board, a power supply and a voltage stabilizer, the main control board is respectively connected with a micro-current amplifier and a display screen, the micro-current amplifier is connected with an FID detector, and the display screen is arranged on the front panel.
In a preferred embodiment of the above, the carrier gas inlet, the hydrogen inlet and the hydrocarbon-removing air inlet are connected to a pressure-stabilizing valve. And stabilizing the pressure of the carrier gas, the hydrogen and the hydrocarbon-removing air to ensure that the carrier gas, the hydrogen and the hydrocarbon-removing air can stably flow into the detection instrument.
As a preferable mode of the above mode, the rear panel is further provided with a heat radiation fan.
As a preferable scheme of the scheme, a heating sheet and a temperature sensor are respectively arranged in the column box and the valve box, and the heating sheet and the temperature sensor are both connected with the electric appliance control module. The independent control of the temperature of the valve box and the column box can be realized.
The utility model has the advantages that: the atmosphere balance gas circuit is arranged, so that the gas pressure balance of the sample gas in the quantitative pipe can be realized, and the precision of a detection result is improved; the number of components is small, the structure is simple, and later maintenance is facilitated; the column box and the valve box are respectively provided with a heating sheet and a temperature sensor, so that the temperature of the valve box and the column box can be independently controlled, and the detection result is more accurate.
Drawings
FIG. 1 is a schematic perspective view of a monitor for monitoring benzene series as a pollution source in the example.
FIG. 2 is a block diagram of a benzene series monitor as a pollution source in the embodiment.
Fig. 3 is a schematic view of an air path structure of the quantitative sampling air path in the embodiment.
Fig. 4 is a schematic view of an air path structure of the atmospheric balancing air path in the embodiment.
Fig. 5 is a schematic view of an air path structure of the detection air path in the embodiment.
1-analysis thermostatic valve box 2-power control module 3-pressure stabilizing valve 4-display screen 5-front panel 6-back panel 7-radiator fan 8-baffle 9-sample introduction solenoid valve 10-quantitative tube 11-conversion module 13-FID detector 14-heating plate 15-temperature controller 16-main control panel 17-micro current amplification circuit 18-data communication interface 19-I/O signal interface 20-power supply and pressure stabilizer 21-HMI data graphic display screen.
Detailed Description
The technical solution of the present invention is further described below by way of examples and with reference to the accompanying drawings.
Example (b):
the utility model provides a pollution sources benzene series monitor, as shown in fig. 1, including the quick-witted case, analysis thermostatic valve case 1 and electrical apparatus control module 2, analysis thermostatic valve case and control module set up in quick-witted incasement, the machine case includes front panel 5, rear panel 6 and baffle 8, front panel and rear panel are connected to the baffle, the baffle left side is equipped with analysis thermostatic valve case, be equipped with electrical apparatus control module 2 on the baffle right side face, front panel front is equipped with display screen 4, still be equipped with the handle in front panel front both sides, front panel back is equipped with surge damping valve 3, surge damping valve and analysis thermostatic valve case's carrier gas entry, hydrogen entry and except that hydrocarbon air entry link to each other, be equipped with radiator fan 7 on the rear panel, the power supply terminal, the sample gas entry, the sample gas export, bypass export and communication interface terminal, communication interface terminal links to each other with the main. Pollution source benzene series monitor acquires the electric energy through the power supply terminal, links to each other with the host computer through the communication interface terminal, realizes automatic monitoring and remote control, and sample gas gets into analysis constant temperature valve case through sample gas entry, and sample gas exports and bypass outlet outflow analysis constant temperature valve case through sample gas.
As shown in fig. 2, the electrical control module includes a main control board 16, a power supply and voltage stabilizer 20, a micro-current amplifier 17 and a temperature controller 15, the main control board 16 is further provided with a data communication interface 18 and an I/O signal interface 19, the main control board 16 is respectively connected with the micro-current amplifier 17, a display screen and the temperature controller 15, in this embodiment, the display screen adopts an HMI data graphic display screen 21, the micro-current amplifier is arranged on the surface of the analysis thermostatic valve box, the micro-current amplifier is connected with an FID detector 13 in the analysis thermostatic valve box, the temperature controller is connected with a heating plate 14, and the heating plate is arranged in the analysis thermostatic valve box. The analysis constant temperature valve case includes valve box and column box, the valve box includes the appearance gas entry, the carrier gas entry, the hydrogen entry, remove hydrocarbon air entry, the appearance gas exit, the bypass export, advance appearance solenoid valve 9, the buret 10, conversion module 11, FID detector 13, be equipped with chromatographic column 12 in the column box, conversion module includes ten logical sampling valve and drives the valve, ten logical sampling valve links to each other with driving the valve, ten logical valve is the pneumatic valve, compressed air controls ten logical sampling valve's the state of switching on through driving the valve, respectively be equipped with a heating plate and a temperature sensor in column box and valve box, heating plate and temperature sensor all link to each other with temperature controller 15. The temperature sensor cooperates with the heating plate to keep the temperature inside the valve box and the column box constant.
The gas circuit in the analysis thermostatic valve box can be changed by changing the conduction state of the ten-way valve, as shown in fig. 3, the analysis thermostatic valve box is a quantitative sampling gas circuit, when the analysis thermostatic valve box is located in the gas circuit, the first interface and the second interface of the ten-way valve are communicated, the third interface and the fourth interface are communicated, the fifth interface and the sixth interface are communicated, the seventh interface and the eighth interface are communicated, the ninth interface and the tenth interface are communicated, and the quantitative sampling gas circuit is used for quantitatively sampling the sample gas and discharging the sample gas in the FID detector and the chromatographic column.
When the sample gas is quantitatively collected, the sample gas enters from the sample gas inlet, sequentially passes through the electromagnetic valve, the filter, the eighth interface of the ten-way valve, the seventh interface of the ten-way valve, the quantitative pipe, the tenth interface of the ten-way valve and the ninth interface of the ten-way valve and then flows out from the sample gas outlet. The solenoid valve is the sample introduction solenoid valve, and the sample introduction solenoid valve is the three-way valve in this embodiment, and the quantitative tube is a 1ml quantitative ring. And after the sample gas passes through the gas path, the gas in the quantitative tube is fully replaced, so that the quantitative tube is filled with the sample gas. When the quantitative tube collects the sample gas, the analysis thermostatic valve box performs back flushing on the residual sample gas left in the last measurement, during back flushing, carrier gas enters from a carrier gas inlet, and is split into a first carrier gas flow and a second carrier gas flow after passing through a first three-way split interface, the first carrier gas flow enters from a bypass outlet and is discharged from the bypass outlet after passing through a ten-way valve third interface, a ten-way valve fourth interface, the chromatographic column, a ten-way valve first interface and a ten-way valve second interface in sequence, and the carrier gas discharges the residual sample gas in the chromatographic column in the process, so that the precision of the next detection is improved; and the second carrier gas flow enters the FID detector after passing through the sixth interface of the ten-way valve, the fifth interface of the ten-way valve and the three-way confluence interface in sequence, and the carrier gas discharges residual sample gas in the chromatographic column in the process, so that the precision of next detection is improved.
After completing sample gas quantitative collection, the conducting state of the ten-way valve is kept unchanged, the conducting state of the sample injection electromagnetic valve is changed, the gas circuit in the analysis thermostatic valve box is changed into an atmosphere balance gas circuit, as shown in fig. 4, sample gas enters from the sample gas inlet and is discharged from the bypass outlet after passing through the electromagnetic valve, the sample gas outlet of the instrument is communicated with the atmosphere at the moment, and the sample gas in the quantitative tube is subjected to atmosphere balance.
After sample gas balance is completed, the conduction state of the ten-way valve is changed, and the gas path in the thermostatic valve box is analyzed to be changed into a detection gas path, as shown in fig. 5, at this time, the first interface of the ten-way valve is communicated with the tenth interface, the second interface is communicated with the third interface, the fourth interface is communicated with the fifth interface, the sixth interface is communicated with the seventh interface, and the eighth interface is communicated with the ninth interface. Carrier gas enters from the carrier gas inlet, is divided into a first detection carrier gas flow and a second detection carrier gas flow after passing through the three-way flow dividing interface, and the first detection carrier gas flow is discharged from the bypass outlet after passing through the third interface, the second interface and the third reducer union of the ten-way valve in sequence; and the second detection carrier gas flow sequentially passes through the sixth interface of the ten-way valve, the seventh interface, the quantitative pipe, the tenth interface of the ten-way valve, the first interface of the ten-way valve, the chromatographic column, the fourth interface of the ten-way valve, the fifth interface of the ten-way valve and the three-way confluence interface and then enters the FID detector, and the FID detector detects the benzene series. And after the state of the ten-way valve is changed for 2 seconds, the sample injection electromagnetic valve is restored to the initial state, sample gas enters from the sample gas inlet and is discharged from the sample gas outlet through the channels of the first interface and the second interface of the six-way valve, and preparation is made for sample gas collection of next detection.
The interface for filling nitrogen is a carrier gas inlet, the air for filling the FID detector is hydrocarbon-removing air, and during detection, the hydrogen inlet and the hydrocarbon-removing air inlet are respectively connected with corresponding gases.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. A pollution source benzene series monitor is characterized in that: including quick-witted case, analysis thermostatic valve case (1) and electrical apparatus control module (2), analysis thermostatic valve case and control module set up at quick-witted incasement, analysis thermostatic valve case includes valve box and post case, and the valve box is including advancing kind solenoid valve (9), drive valve, ten logical sampling valve, buret (10) and FID detector (13), drive valve and ten logical sampling valve link to each other, and the post case is equipped with chromatographic column (12), analysis thermostatic valve case still includes appearance gas inlet, appearance gas outlet, bypass export, carrier gas entry, hydrogen entry and removes hydrocarbon air inlet, and analysis thermostatic valve case forms quantitative sampling gas circuit, atmospheric balance gas circuit and detection gas circuit to ten logical sampling valve control through driving the valve.
2. The monitor for pollution source benzene series according to claim 1, wherein: the quantitative sampling gas circuit comprises a sample gas inlet, a sample introduction electromagnetic valve, a ten-way sampling valve, a quantitative pipe and a sample gas outlet in sequence.
3. The monitor for pollution source benzene series according to claim 1, wherein: the atmosphere balance gas circuit comprises a sample gas inlet, a sample introduction electromagnetic valve and a bypass outlet in sequence.
4. The monitor for pollution source benzene series according to claim 1, wherein: the detection gas circuit comprises a carrier gas inlet, a ten-way sampling valve, a quantitative tube, a chromatographic column and an FID detector in sequence.
5. The monitor for benzene series as a pollution source according to claim 1, 2, 3 or 4, wherein: the hydrogen inlet and the hydrocarbon-removed air inlet are both connected to the FID detector.
6. The monitor for pollution source benzene series according to claim 1, wherein: the quick-witted case includes front panel (5), rear panel (6) and baffle (8), front panel and rear panel are connected to the baffle, baffle one side is equipped with the analysis constant temperature valve case, is equipped with electrical apparatus control module on the baffle opposite side face, electrical apparatus control module includes main control board (16) and power supply and stabiliser (20), and the main control board links to each other with little current amplifier (17) and display screen (4) respectively, little current amplifier links to each other with the FID detector, the display screen sets up on the front panel.
7. The monitor of claim 5, wherein the monitor comprises: the carrier gas inlet, the hydrogen inlet and the hydrocarbon-removing air inlet are respectively connected with a pressure stabilizing valve (3).
8. The monitor of claim 6, wherein the monitor comprises: and the rear panel is also provided with a heat radiation fan (7).
9. The monitor for pollution source benzene series according to claim 1, wherein: and the column box and the valve box are respectively provided with a heating plate and a temperature sensor, and the heating plate and the temperature sensor are connected with the electric appliance control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020998708.1U CN212483473U (en) | 2020-06-03 | 2020-06-03 | Pollution source benzene series monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020998708.1U CN212483473U (en) | 2020-06-03 | 2020-06-03 | Pollution source benzene series monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212483473U true CN212483473U (en) | 2021-02-05 |
Family
ID=74446670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020998708.1U Active CN212483473U (en) | 2020-06-03 | 2020-06-03 | Pollution source benzene series monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212483473U (en) |
-
2020
- 2020-06-03 CN CN202020998708.1U patent/CN212483473U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104807899B (en) | Volatile carbonyl compound on-line analysis device | |
| CN209471083U (en) | A kind of non-methane total hydrocarbons content detection device | |
| CN203870078U (en) | Gas chromatography separating system | |
| CN103336070B (en) | The pick-up unit of sulfur-bearing failure gas component and method in a kind of quantitative detection sulfur hexafluoride electrical equipment | |
| CN109490443A (en) | A kind of non-methane total hydrocarbons content detection device and method | |
| CN101609072A (en) | Volatile organic matter continuous monitor | |
| CN102621272A (en) | On-line analyzer for hydrocarbons in air | |
| CN103134875A (en) | On-line pretreatment device of aquatic volatile organic compounds | |
| Wang et al. | Crn (n= 1–4) clustered (8, 0) single-walled CNT: comparison of gas-sensitive properties to air discharge pollutants (CO, NOx) | |
| CN110780015A (en) | Detection device and detection method for non-methane total hydrocarbons | |
| CN101138702A (en) | Engine vent gas catalytic cleaner activation evaluating system | |
| CN105092717A (en) | Full-automatic check system for transformer oil chromatography on-line monitoring device | |
| CN108195979A (en) | Air VOCs on-line preconcentrations sampling device and method | |
| CN201637732U (en) | Gas chromatograph for determining benzene and non-methane hydrocarbons in food-grade carbon dioxide | |
| CN210427492U (en) | Novel methane non-methane total hydrocarbon flow architecture | |
| CN204479528U (en) | NMHC and benzene class material detect special purpose device | |
| CN211453265U (en) | Portable catering oil smoke monitor and portable catering oil smoke monitoring system | |
| CN107192780A (en) | A kind of ambient soil detection means | |
| CN209894763U (en) | Detection apparatus for non-methane total hydrocarbon | |
| CN212568640U (en) | Pollution source non-methane total hydrocarbon monitor | |
| CN211955348U (en) | Helium Ionization Gas Chromatograph for Dissolved Gas Analysis in Transformer Oil | |
| CN102539608B (en) | A kind of chromatographic detection apparatus and method | |
| CN209198394U (en) | VOCs online monitoring system | |
| CN208612186U (en) | A multifunctional experimental device for gaseous pollutant purification | |
| CN221960094U (en) | System for on-line monitoring malodorous gas by utilizing GC-FID/FPD |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |