CN116399652B - Volatile organic compound sampling detection method - Google Patents
Volatile organic compound sampling detection method Download PDFInfo
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- CN116399652B CN116399652B CN202310678984.8A CN202310678984A CN116399652B CN 116399652 B CN116399652 B CN 116399652B CN 202310678984 A CN202310678984 A CN 202310678984A CN 116399652 B CN116399652 B CN 116399652B
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- 238000005070 sampling Methods 0.000 title claims abstract description 363
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 54
- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 127
- 238000010438 heat treatment Methods 0.000 claims abstract description 70
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 24
- 238000010926 purge Methods 0.000 claims abstract description 14
- 238000003780 insertion Methods 0.000 claims description 26
- 238000004321 preservation Methods 0.000 claims description 20
- 238000009833 condensation Methods 0.000 claims description 9
- 230000005494 condensation Effects 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 abstract description 4
- 239000005416 organic matter Substances 0.000 abstract description 4
- 238000007664 blowing Methods 0.000 abstract description 2
- 150000002894 organic compounds Chemical class 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 10
- 239000000945 filler Substances 0.000 description 9
- 229920001296 polysiloxane Polymers 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- VGQXTTSVLMQFHM-UHFFFAOYSA-N peroxyacetyl nitrate Chemical compound CC(=O)OO[N+]([O-])=O VGQXTTSVLMQFHM-UHFFFAOYSA-N 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a volatile organic compound sampling and detecting method, belonging to the technical field of organic compound detecting systems; the volatile organic matter sampling comprises the following steps: s1, preparing equipment in the early stage; s2, placing the exhaust tube at a sampling point; s3, operating the air pump, and sampling gas to perform a pretreatment process; s4, S5 and S6, sequentially completing sampling of all required sampling tubes; the volatile organic compound detection method comprises the following steps: s7, connecting a box body air outlet pipeline and a box body air inlet pipeline with a detection instrument; s8, heating the specified heating sleeve, and blowing out volatile organic compounds from a box body air outlet pipeline by using purge gas of a detection instrument for detection; s9, detecting volatile organic compounds in all sampling tubes; s10, heating all sampling tubes, purging residual volatile organic compounds by nitrogen, and cleaning all the sampling tubes for use; according to the method, the volatile organic compounds of the sampling gas are rapidly and accurately sampled and released, and the convenience and accuracy of sampling are ensured.
Description
Technical Field
The invention relates to the technical field of organic matter detection systems, in particular to a volatile organic matter sampling detection method.
Background
According to the definition of world health organization, volatile Organic Compounds (VOCs) are organic compounds at 50-250 ℃, the volatile organic compounds are atmospheric pollutants, have toxicity, participate in photochemical reactions under illumination conditions to form photochemical smog, generate ozone, peroxy acetyl nitrate and other pollutants, and are the core of control for the accuracy, the quality and the quantification of different types of volatile organic compounds; corresponding acquisition and detection standards of VOCs are standardized and executed in each field; the existing method for collecting VOCs mainly comprises the steps of actively sampling, placing an exhaust tube at a sampling point, connecting the exhaust tube with a sampling tube, namely, exhausting air through a sampling pump to enable gas to flow through the sampling tube, wherein the sampling tube contains special organic matter absorption filler, so that VOCs substances reside on the absorption filler in the sampling tube; then the sampling tube is disassembled and transported back to the laboratory for analysis in time, and after the sampling tube is sent to the laboratory, the sampling tube is heated to release volatile organic compounds in the absorption filler, so that the detection requirement is met, and the released sampling tube is further cleaned to ensure that the volatile organic compounds in the absorption filler are completely released, so that the next sampling requirement is met; however, the sampling method has the following disadvantages:
1. The sampling is generally carried out for a plurality of times, so that the accuracy of a sampling result is ensured, and therefore, a plurality of sampling pipes are required to be frequently disassembled and assembled, and the disassembly and assembly operations are very complicated;
2. after the sampling tube is sent to a laboratory, separate equipment is needed to heat the sampling tube so as to release volatile organic compounds in the absorbing filler, and after release is finished, separate cleaning is needed to be carried out on the sampling tube, and release and cleaning cannot be finished in one piece of equipment, so that the sampling tube also needs to be frequently disassembled and assembled;
3. the absorption filler in the sampling tube has strong absorption capability to organic matters in the air, so that once the sampling tube is frequently contacted with the outside air in the transportation process, the absorption filler can easily absorb volatile organic matters in the outside air to cause inaccurate detection results;
4. under the environment with serious moisture, the volatile organic compounds in the collected gas are directly collected through the exhaust pipe and mixed with the moisture to enter the sampling pipe, so that on one hand, the final detection is affected, and on the other hand, the absorption quality of the absorption filler in the sampling pipe is deteriorated, so that the use is affected;
5. at present, the exhaust tube adopts a silicone tube, the flow precision is kept between 0.1 and 1L/min, the diameter of the silicone tube is 0.5cm at most, the exhaust tube is further regulated after the standard of volatile organic compounds appears, the flow precision is changed to be between 0.01 and 0.1L/min, the flow precision rises by one grade, the silicone tube cannot be too thin to meet the requirement, and volatile organic compounds can remain in the silicone tube during collection, so that the volatile organic compounds cannot be discharged and the detection is influenced.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the method can sample and release the volatile organic compounds of the sampled gas rapidly and accurately, and ensures the convenience and accuracy of sampling.
In order to solve the technical problems, the technical scheme of the invention is as follows: a volatile organic compound sampling detection method comprises the following steps:
the device comprises a preservation box body, a pretreatment box body and an exhaust pipe, wherein the preservation box body, the pretreatment box body and the exhaust pipe are sequentially communicated, the preservation box body comprises an air inlet box, a sampling box and an air outlet box, the sampling box and the air inlet box are sequentially stacked and detachably mounted and fixed, a plurality of heating sleeves are arranged in the sampling box, corresponding sampling pipes are arranged in the heating sleeves, a nitrogen tank is further arranged in the sampling box, the nitrogen tank is communicated with the air inlet box, an air inlet conveying channel and an air outlet conveying channel which are correspondingly and hermetically matched with two ends of the sampling pipes are respectively arranged in the air inlet box and the air outlet box, electromagnetic control valves which are convenient to open or close are respectively arranged on the air inlet box, the air inlet conveying channel and the air outlet conveying channel, the air outlet box and the air inlet box are identical in structure, a lock catch structure is arranged between the sampling box and the air inlet box, a corresponding sampling pipe is arranged in the heating sleeve, an air inlet pipeline is arranged on the air inlet box, an air inlet pipeline is convenient to open and close to the air inlet pipeline is arranged on the air inlet box, and an air inlet pipeline is convenient to open and close the air inlet pipeline is arranged on the air inlet pipeline, and the air inlet pipeline is convenient to open and close to the air inlet pipeline is arranged on the air inlet pipeline; the box body air inlet pipe is communicated with a pretreatment box body for carrying out sampling pretreatment on sampling gas through a quick-insertion structure, the pretreatment box body is connected with a copper exhaust pipe through the quick-insertion structure, and a replacement connection pipe with a valve is further connected between the air inlet box and the air outlet box;
S2, placing an exhaust pipe at a sampling point, connecting an exhaust pump with an exhaust pipeline of the box body, and closing a valve on the replacement connecting pipeline; opening flow control valves on an air inlet pipeline and an air outlet pipeline of the box body, and then opening first electromagnetic control valves corresponding to two ends of a first sampling pipe in the air inlet box and the air outlet box;
s3, the air pump works, and sampling gas enters the pretreatment box body from the air extraction pipe to carry out pretreatment procedures;
s4, after the pretreatment box body finishes pretreatment on the sampling gas, the sampling gas enters the air inlet box from the box body air inlet pipeline;
s5, the sampling gas in the gas inlet box enters the first sampling pipe through a gas inlet conveying channel corresponding to the first sampling pipe for sampling, and after the sampling is finished, the sampling gas enters the gas outlet box through a gas outlet conveying pipeline and is finally discharged from the gas outlet pipeline of the box body;
s6, after the sampling of the first sampling tube is completed, closing the corresponding first electromagnetic control valve, then opening the second electromagnetic control valve corresponding to the two ends of the second sampling tube, repeating S4 to S5 to complete the sampling of the second sampling tube, repeating the steps until the required sampling of all the sampling tubes is completed, and finally closing the electromagnetic control valves corresponding to all the sampling tubes, and stopping the air pump; removing the exhaust pipe from the sampling point, and separating the box body air inlet pipeline from the pretreatment box body; then the preserving box body and the sampling pump are integrally moved into a clean environment, a valve on a replacement connecting pipeline is opened, an air extracting pump is started to continuously extract air, so that external clean air enters the air inlet box, the replacement connecting pipeline and the air outlet box, after the sampling gas in the air inlet box and the sampling gas in the air outlet box are replaced, the air extracting pump stops, the valve on the replacement connecting pipeline is closed, and finally the air outlet pipeline of the box body is separated from the air extracting pump;
The volatile organic compound detection method comprises the following steps:
s7, moving the preservation box body into a laboratory, and connecting a box body air outlet pipeline and a box body air inlet pipeline with a detection instrument;
s8, opening a heating sleeve corresponding to the designated sampling tube to heat the designated sampling tube; volatile organic matters in the sampling tube begin to volatilize, electromagnetic control valves corresponding to two ends of the designated sampling tube are opened, and the purge gas of the detection instrument blows out the volatile organic matters from a box body air outlet pipeline for detection;
s9, after detection is completed, closing electromagnetic control valves corresponding to two ends of the designated sampling tube, and repeating the step S8 until all volatile organic compounds in the sampling tube are detected, and disconnecting the box body air outlet pipeline from the box body air inlet pipeline from the detection instrument;
s10, all heating sleeves are started to heat all sampling tubes, electromagnetic control valves on a nitrogen tank are opened, nitrogen enters into each sampling tube to purge residual volatile organic compounds, and all sampling tubes are cleaned for use.
In the step S2, an air inlet and an air outlet are formed in the pretreatment box body, a box body air inlet pipeline and a box body air outlet pipeline are arranged at the air inlet and the air outlet, the box body air inlet pipeline is communicated with the box body air outlet pipeline through a quick-insertion structure, pretreatment valves which are convenient to open and close are arranged on the box body air inlet pipeline and the box body air outlet pipeline, quick-insertion structures are arranged at the ends of the box body air inlet pipeline and the box body air outlet pipeline, a pretreatment pipe communicated with the air inlet and the air outlet is formed in the pretreatment box body, the pretreatment pipe comprises a heating part and a condensing part, the heating part is positioned at the upstream of the condensing part, a condensate collecting port is arranged at the lower position of the condensing part, a condensate collecting bottle which is convenient to disassemble is arranged at the condensate collecting port, and an exhaust pipe is connected to the box body air inlet pipeline through the quick-insertion structure; the mode that sampling gas enters the pretreatment box body from the exhaust pipe to carry out pretreatment procedures comprises the following steps:
S21, the exhaust pipe is communicated with the box body air inlet pipeline, and sampling gas enters the box body air inlet pipeline;
s22, the sampling gas enters a pretreatment pipe, the heating part heats the sampling gas, and then the condensing part condenses the sampling gas;
s23, after condensation is completed, condensate flows into a condensate collecting bottle, and after sampling gas treatment is completed, the condensate enters a box body air inlet pipeline from a box body air outlet pipeline.
As a preferred solution, in steps S4 and S5, the air inlet box includes an air inlet chamber, the air outlet box includes an air outlet chamber, the air inlet chamber and the air outlet chamber are communicated with all sampling tubes, and the sampling gas can enter the corresponding sampling tubes by opening the corresponding electromagnetic control valves.
In a preferred embodiment, the quick-connect structure includes a gas quick-connect, and the gas quick-connect is provided with a male head and a female head that are mutually matched, so that the main body of the preservation box, the pretreatment box body and the exhaust pipe are mutually communicated.
In a preferred embodiment, in the method, the exhaust pipe is provided with a heating wire, and the sampling gas is primarily heated in the exhaust pipe.
As a preferred scheme, the lock catch structure comprises a groove seat fixedly arranged on the air inlet box and the air outlet box and a lock seat fixed on the sampling box, wherein a lock body rotating around a pin shaft fixed on the lock seat is arranged on the lock seat, a retaining ring corresponding to the groove seat is hinged on the lock body, the lock body is rotated to cover the lock seat through the retaining ring, the groove seat is buckled by the retaining ring, and the air inlet box is tightly pressed and fixed with the sampling box or the air outlet box and the sampling box, so that the sampling pipe forms a seal with an air inlet conveying channel or an air outlet conveying channel.
After the technical scheme is adopted, the invention has the following effects: due to the volatile organic compound sampling and detecting method, the volatile organic compound sampling method comprises the following steps:
the device comprises a preservation box body, a pretreatment box body and an exhaust pipe, wherein the preservation box body, the pretreatment box body and the exhaust pipe are sequentially communicated, the preservation box body comprises an air inlet box, a sampling box and an air outlet box, the sampling box and the air inlet box are sequentially stacked and detachably mounted and fixed, a plurality of heating sleeves are arranged in the sampling box, corresponding sampling pipes are arranged in the heating sleeves, a nitrogen tank is further arranged in the sampling box, the nitrogen tank is communicated with the air inlet box, an air inlet conveying channel and an air outlet conveying channel which are correspondingly and hermetically matched with two ends of the sampling pipes are respectively arranged in the air inlet box and the air outlet box, electromagnetic control valves which are convenient to open or close are respectively arranged on the air inlet box, the air inlet conveying channel and the air outlet conveying channel, the air outlet box and the air inlet box are identical in structure, a lock catch structure is arranged between the sampling box and the air inlet box, a corresponding sampling pipe is arranged in the heating sleeve, an air inlet pipeline is arranged on the air inlet box, an air inlet pipeline is convenient to open and close to the air inlet pipeline is arranged on the air inlet box, and an air inlet pipeline is convenient to open and close the air inlet pipeline is arranged on the air inlet pipeline, and the air inlet pipeline is convenient to open and close to the air inlet pipeline is arranged on the air inlet pipeline; the box body air inlet pipe is communicated with a pretreatment box body for carrying out sampling pretreatment on sampling gas through a quick-insertion structure, the pretreatment box body is connected with a copper exhaust pipe through the quick-insertion structure, and a replacement connection pipe with a valve is further connected between the air inlet box and the air outlet box;
S2, placing an exhaust pipe at a sampling point, connecting an exhaust pump with an exhaust pipeline of the box body, and closing a valve on the replacement connecting pipeline; opening flow control valves on an air inlet pipeline and an air outlet pipeline of the box body, and then opening first electromagnetic control valves corresponding to two ends of a first sampling pipe in the air inlet box and the air outlet box;
s3, the air pump works, and sampling gas enters the pretreatment box body from the air extraction pipe to carry out pretreatment procedures;
s4, after the pretreatment box body finishes pretreatment on the sampling gas, the sampling gas enters the air inlet box from the box body air inlet pipeline;
s5, the sampling gas in the gas inlet box enters the first sampling pipe through a gas inlet conveying channel corresponding to the first sampling pipe for sampling, and after the sampling is finished, the sampling gas enters the gas outlet box through a gas outlet conveying pipeline and is finally discharged from the gas outlet pipeline of the box body;
s6, after the sampling of the first sampling tube is completed, closing the corresponding first electromagnetic control valve, then opening the second electromagnetic control valve corresponding to the two ends of the second sampling tube, repeating S4 to S5 to complete the sampling of the second sampling tube, repeating the steps until the required sampling of all the sampling tubes is completed, and finally closing the electromagnetic control valves corresponding to all the sampling tubes, and stopping the air pump; removing the exhaust pipe from the sampling point, and separating the box body air inlet pipeline from the pretreatment box body; then the preserving box body and the sampling pump are integrally moved into a clean environment, a valve on a replacement connecting pipeline is opened, an air extracting pump is started to continuously extract air, so that external clean air enters the air inlet box, the replacement connecting pipeline and the air outlet box, after the sampling gas in the air inlet box and the sampling gas in the air outlet box are replaced, the air extracting pump stops, the valve on the replacement connecting pipeline is closed, and finally the air outlet pipeline of the box body is separated from the air extracting pump;
The volatile organic compound detection method comprises the following steps:
s7, moving the preservation box body into a laboratory, and connecting a box body air outlet pipeline and a box body air inlet pipeline with a detection instrument;
s8, opening a heating sleeve corresponding to the designated sampling tube to heat the designated sampling tube; volatile organic matters in the sampling tube begin to volatilize, electromagnetic control valves corresponding to two ends of the designated sampling tube are opened, and the purge gas of the detection instrument blows out the volatile organic matters from a box body air outlet pipeline for detection;
s9, after detection is completed, closing electromagnetic control valves corresponding to two ends of the designated sampling tube, and repeating the step S8 until all volatile organic compounds in the sampling tube are detected, and disconnecting the box body air outlet pipeline from the box body air inlet pipeline from the detection instrument;
s10, heating all sampling pipes by all heating sleeves, opening electromagnetic control valves on a nitrogen tank, blowing residual volatile organic compounds into all the sampling pipes by nitrogen, and cleaning all the sampling pipes for use;
according to the method, the sampling gas can be processed through the pretreatment box body, the purity of the sampling gas is effectively improved, the accuracy is improved, the air pump works, the flow control valve is opened, the electromagnetic control valve at the two ends of the corresponding sampling pipe is opened, the corresponding sampling pipe can be used for sampling, the residual sampling gas in the air inlet box and the air outlet box is discharged through the replacement connecting pipeline, and then the volatile organic compounds in the sampling pipe can be volatilized through heating of the heating sleeve, so that the sampling and the release can be rapidly and accurately carried out, and the convenience and the accuracy of sampling are greatly improved.
In step S2, an air inlet and an air outlet are formed in the pretreatment box body, a box body air inlet pipeline and a box body air outlet pipeline are arranged at the air inlet and the air outlet, the box body air inlet pipeline is communicated with the box body air outlet pipeline through a quick-insertion structure, pretreatment valves which are convenient to open and close are arranged on the box body air inlet pipeline and the box body air outlet pipeline, quick-insertion structures are arranged at the ends of the box body air inlet pipeline and the box body air outlet pipeline, pretreatment pipes communicated with the air inlet and the air outlet are formed in the pretreatment box body, the pretreatment pipes comprise a heating part and a condensing part, the heating part is positioned at the upstream of the condensing part, a condensate collecting port is arranged at the lower position of the condensing part, a condensate collecting bottle which is convenient to disassemble and assemble is arranged at the condensate collecting port, and an exhaust pipe is connected to the box body air inlet pipeline through the quick-insertion structure; the mode that sampling gas enters the pretreatment box body from the exhaust pipe to carry out pretreatment procedures comprises the following steps:
s21, the exhaust pipe is communicated with the box body air inlet pipeline, and sampling gas enters the box body air inlet pipeline;
s22, the sampling gas enters a pretreatment pipe, the heating part heats the sampling gas, and then the condensing part condenses the sampling gas;
S23, after condensation is completed, condensate flows into a condensate collecting bottle, and after sampling gas treatment is completed, the condensate enters a box body air inlet pipeline from a box body air outlet pipeline;
thus, the sampling gas can be dried, and the volatile organic compounds collected in the sampling tube are more accurate in detection.
In the steps S4 and S5, the air inlet box includes an air inlet chamber, the air outlet box includes an air outlet chamber, the air inlet chamber and the air outlet chamber are communicated with all sampling pipes, and the sampling gas can enter the corresponding sampling pipes by opening the corresponding electromagnetic control valves; the complicated process of frequently replacing different sampling pipes is omitted, and the sampling efficiency is improved.
In the method, the quick-inserting structure comprises the gas quick connector, and the gas quick connector is provided with the male connector and the female connector which are matched with each other, so that the preservation box body, the pretreatment box body and the exhaust pipe are communicated with each other, and the universality and the connection efficiency are improved.
In the method, the heating wire is arranged on the exhaust pipe, and the sampling gas is primarily heated in the exhaust pipe; the temperature of the sampled gas can be increased during pretreatment.
Because the lock catch structure comprises a groove seat fixedly arranged on the air inlet box and the air outlet box and a lock seat fixed on the sampling box, a lock body rotating around a pin shaft fixed on the lock seat is arranged on the lock seat, a retaining ring corresponding to the groove seat is hinged on the lock body, the lock body is buckled on the groove seat through the retaining ring, the lock body is rotated to cover the lock seat, the retaining ring is buckled on the groove seat, the air inlet box is fixedly pressed between the sampling box or the air outlet box and the sampling box, and the sampling pipe forms a seal with the air inlet conveying channel or the air outlet conveying channel.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a perspective view of an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of the inside of an embodiment of the present invention;
FIG. 3 is a front view of a pre-processing cassette and exhaust tube according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the structure of the inside of the holding tank according to the embodiment of the present invention;
FIG. 5 is a schematic view of the structure of the bottom of the inlet box of an embodiment of the invention;
FIG. 6 is a schematic view of the structure of FIG. 5 at A-A;
FIG. 7 is a schematic view of the structure of a sample box according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of the structure of an outlet box according to an embodiment of the present invention;
in the accompanying drawings: 1. an air inlet box; 2. a sampling box; 3. an air outlet box; 4. heating the sleeve; 5. a sampling tube; 6. a nitrogen tank; 7. a box air inlet pipeline; 8. a box body air outlet pipeline; 9. a flow control valve; 10. a groove seat; 11. a lock base; 12. a lock body; 13. a clasp ring; 14. an air intake chamber; 141. an intake delivery hole; 15. an intake delivery passage; 16. an upper guide chute; 17. an air outlet chamber; 18. an air outlet delivery hole; 19. a lower guide chute; 20. an air outlet conveying channel; 21. an elastic washer; 22. purging the pipeline; 23. a gas quick connector; 24. an electromagnetic control valve; 25. a control screen; 26. a handle; 27. a pre-process cartridge; 28. an air inlet; 29. an air outlet; 30. a box body air inlet pipeline; 31. a box body air outlet pipeline; 32. a pretreatment valve; 33. an exhaust pipe; 34. heating the pipe section; 35. a heating wire; 36. a condensing tube section; 361. a first pipe section; 362. a second pipe section; 363. a flow guide pipe section; 37. an exhaust pipe section; 38. a semiconductor refrigeration sheet; 39. a condensate collection port; 40. a condensate collection bottle; 41. a first replacement conduit; 42. a second replacement conduit; 43. a communication pipe; 44. ball valve.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
As shown in fig. 1 to 8, the embodiment of the invention discloses a volatile organic compound sampling and detecting method, which comprises the following steps:
the device comprises a preservation box body, a pretreatment box body 27 and an exhaust pipe 33, wherein the preservation box body, the pretreatment box body 27 and the exhaust pipe 33 are sequentially communicated, the preservation box body comprises an air inlet box 1, a sampling box 2 and an air outlet box 3, the sampling box 2 and the air inlet box 1 are sequentially stacked and detachably mounted and fixed, a plurality of heating sleeves 4 are arranged in the sampling box 2, corresponding sampling pipes 5 are arranged in the heating sleeves 4, a nitrogen tank 6 is further arranged in the sampling box 2, the nitrogen tank 6 is communicated with the air inlet box 1, an air inlet conveying channel 15 and an air outlet conveying channel 20 which are correspondingly matched with two ends of the sampling pipes 5 are respectively arranged in the air inlet box 1 and the air outlet box 3, the air inlet conveying channel 15 and the air outlet conveying channel 20 are respectively pressed and fixed through the air outlet box 3 and the air outlet box 1, electromagnetic control valves 24 which are convenient to open or close are respectively arranged on the air inlet box 3 and the air box 1, a plurality of heating sleeves 4 are arranged in the sampling box 2, a corresponding air inlet box 1 is provided with a lock catch, the air inlet box 7 is arranged on the air inlet box 1, the air inlet box is provided with an air inlet pipeline 7 and an air outlet pipeline 8, the air inlet pipeline 7 is arranged on the air inlet box is provided with an air inlet pipeline 8, and the air outlet pipeline 8 is provided with an air inlet pipeline 7, and the air outlet pipeline 7 is provided with an air inlet pipeline 8, and the air inlet pipeline 7 is provided with an air inlet pipeline 7, and the air inlet pipeline 7 is provided with an air inlet pipeline 8; the box body air inlet pipeline 7 is communicated with a pretreatment box body 27 for carrying out sampling pretreatment on sampling gas through a quick-insertion structure, the pretreatment box body 27 is connected with a copper exhaust pipe 33 through the quick-insertion structure, and a replacement connecting pipeline with a valve is further connected between the air inlet box 1 and the air outlet box 3;
S2, placing an exhaust pipe 33 at a sampling point, wherein the common sampling point is an enterprise waste gas discharge pipeline, the exhaust pipe 33 needs to extend into the enterprise waste gas discharge pipeline for air extraction sampling, a box body air outlet pipeline 8 is connected with an exhaust pump, and a valve on a replacement connection pipeline is closed; opening the flow control valves 9 on the box air inlet pipeline 7 and the box air outlet pipeline 8, and then opening the first electromagnetic control valves 24 corresponding to the two ends of the first sampling pipe 5 in the air inlet box 1 and the air outlet box 3;
s3, operating the air pump, and enabling the sampling gas to enter the pretreatment box body 27 from the air pump tube 33 to perform a pretreatment process;
s4, after the pretreatment box 27 finishes pretreatment on the sampling gas, the sampling gas enters the air inlet box 1 from the box air inlet pipeline 7;
s5, the sampling gas in the gas inlet box 1 enters the first sampling pipe 5 through a gas inlet conveying channel 15 corresponding to the first sampling pipe 5 for sampling, and after the sampling is finished, the sampling gas enters the gas outlet box 3 through a gas outlet conveying pipeline and is finally discharged from a box body gas outlet pipeline 8;
s6, after the sampling of the first sampling tube 5 is completed, closing a first electromagnetic control valve 24 corresponding to the two ends of the first sampling tube 5, then opening a second electromagnetic control valve 24 corresponding to the two ends of the second sampling tube 5, repeating S4 to S5, completing the sampling of the second sampling tube 5, repeating the steps until the required sampling of all the sampling tubes 5 is completed, and finally closing the electromagnetic control valves 24 corresponding to all the sampling tubes 5, and stopping the air pump; removing the exhaust tube 33 from the sampling point, and separating the tank air inlet pipe 7 from the pretreatment box 27; then the preserving box body and the sampling pump are integrally moved into a clean environment, a valve on a replacement connecting pipeline is opened, and an air pump is started to continuously exhaust, so that external clean air enters the air inlet box 1, the replacement connecting pipeline and the air outlet box 3, after sampling gas in the air inlet box 1 and the air outlet box 3 is replaced, the air pump is stopped, the valve on the replacement connecting pipeline is closed, and finally, the box body air outlet pipeline 8 is separated from the air pump;
The volatile organic compound detection method comprises the following steps:
s7, moving the preservation box body into a laboratory, and connecting a box body air outlet pipeline 8 and a box body air inlet pipeline 7 with a detection instrument;
s8, opening the heating sleeve 4 corresponding to the designated sampling tube 5 to heat the designated sampling tube 5; volatile organic compounds in the sampling tube 5 begin to volatilize, electromagnetic control valves 24 corresponding to two ends of the designated sampling tube 5 are opened, and the volatile organic compounds are blown out from a box body air outlet pipeline 8 by purge gas of a detection instrument for detection;
s9, after detection is completed, closing electromagnetic control valves 24 corresponding to two ends of the designated sampling tube 5, and repeating the step S8 until all volatile organic compounds in the sampling tube 5 are detected, and disconnecting the box body air outlet pipeline 8 from the box body air inlet pipeline 7 from the detection instrument;
s10, all heating sleeves 4 are started to heat all sampling tubes 5, electromagnetic control valves 24 on a nitrogen tank 6 are opened, nitrogen enters into each sampling tube 5 to purge residual volatile organic compounds, and all sampling tubes 5 are cleaned for use; in the method, the sampling gas can be processed through the pretreatment box body 27, the purity of the sampling gas is effectively improved, the accuracy is improved, the air pump works, the flow control valve 9 is opened, the electromagnetic control valves 24 at the two ends of the corresponding sampling pipe 5 are opened, the corresponding sampling pipe 5 can be used for sampling, the residual sampling gas in the air inlet box 1 and the air outlet box 3 is discharged through the replacement connecting pipeline, and then the volatile organic compounds in the sampling pipe 5 can be volatilized through heating of the heating sleeve 4, so that the sampling and releasing can be rapidly and accurately carried out, and the convenience and the accuracy of the sampling are greatly improved.
Preferably, in step S2, the pretreatment box 27 is provided with an air inlet 28 and an air outlet 29, the air inlet 28 and the air outlet 29 are provided with a box air inlet pipe 30 and a box air outlet pipe 31, the box air inlet pipe 7 is communicated with the box air outlet pipe 31 through a quick-plug structure, the box air inlet pipe 30 and the box air outlet pipe 31 are provided with a pretreatment valve 32 which is convenient to open and close, the ends of the box air inlet pipe 30 and the box air outlet pipe 31 are both quick-plug structures, the pretreatment box 27 is internally provided with a pretreatment pipe communicated with the air inlet 28 and the air outlet 29, the pretreatment pipe comprises a heating part and a condensing part, the heating part is positioned at the upstream of the condensing part, the low position of the condensing part is provided with a condensate collecting port 39, the condensate collecting port 39 is provided with a condensate collecting bottle 40 which is convenient to disassemble and assemble, and the box air inlet pipe 30 is connected with an exhaust pipe 33 through a quick-plug structure; the mode of introducing the sample gas from the exhaust pipe 33 into the pretreatment box 27 to perform the pretreatment process includes the steps of:
s21, an exhaust pipe 33 is communicated with the box body air inlet pipeline 30, and sampling gas enters the box body air inlet pipeline 30;
s22, the sampling gas enters a pretreatment pipe, the heating part heats the sampling gas, and then the condensing part condenses the sampling gas;
S23, after condensation is completed, condensate flows into a condensate collecting bottle 40, and after sampling gas treatment is completed, the condensate enters a box body air inlet pipeline 7 from a box body air outlet pipeline 31; this allows the sample gas to dry and the volatile organic compounds collected in the sample tube 5 to be more accurately detected.
Preferably, in steps S4 and S5, the air inlet box 1 includes an air inlet chamber 14, the air outlet box 3 includes an air outlet chamber 17, the air inlet chamber 14 and the air outlet chamber 17 are communicated with all sampling tubes 5, and the sampling gas can enter the corresponding sampling tubes 5 by opening the corresponding electromagnetic control valves 24; the complicated process of frequently replacing different sampling pipes 5 is omitted, and the sampling efficiency is improved.
Preferably, in the method, the quick-insertion structure comprises a gas quick connector 23, wherein the gas quick connector 23 is provided with a male connector and a female connector which are matched with each other, so that the preservation box body, the pretreatment box body 27 and the exhaust pipe 33 are communicated with each other; and the universality and the connection efficiency are improved.
Preferably, in the method, the heating wire 35 is arranged on the exhaust pipe 33, and the sampling gas can be primarily heated in the exhaust pipe 33; the temperature of the sampled gas can be increased during pretreatment.
Preferably, the locking structure comprises a groove seat 10 fixedly installed on the air inlet box 1 and the air outlet box 3 and a lock seat 11 fixed on the sampling box 2, the lock seat 11 is provided with a lock body 12 which rotates around a pin shaft fixed on the lock seat 11, the lock body 12 is hinged with a retaining ring 13 corresponding to the groove seat 10, the groove seat 10 is buckled through the retaining ring 13, the lock body 12 is rotated, the lock body 12 is covered on the lock seat 11, the retaining ring 13 buckles the groove seat 10, the air inlet box 1 is fixedly pressed between the sampling box 2 or the air outlet box 3 and the sampling box 2, and the sampling pipe 5 forms a seal with the air inlet conveying channel 15 or the air outlet conveying channel 20.
In addition, the embodiment of the invention also discloses a sampling device for realizing the sampling detection method, as shown in fig. 1 to 8, a volatile organic compound sampling device comprises a preserving box body, a pretreatment box body 27 and an exhaust pipe 33, wherein the preserving box body, the pretreatment box body 27 and the exhaust pipe 33 are sequentially communicated, the preserving box body comprises an air inlet box 1, a sampling box 2 and an air outlet box 3, the sampling box 2 and the air inlet box 1 are sequentially stacked and detachably mounted and fixed, a plurality of heating sleeves 4 are arranged in the sampling box 2, corresponding sampling pipes 5 are arranged in the heating sleeves 4, a nitrogen tank 6 is also arranged in the sampling box 2, the nitrogen tank 6 is communicated with the air inlet box 1, an air inlet conveying channel 15 and an air outlet conveying channel 20 which are correspondingly and hermetically matched with two ends of the sampling pipes 5 are respectively arranged in the air inlet box 1 and the air outlet box 3, each sampling box 5 is tightly pressed and fixed through the air inlet box 3, a control valve 24 is respectively arranged on the air inlet box 6, the air inlet conveying channel 15 and the air outlet conveying channel 20, a control valve 24 is respectively arranged on the air inlet box 3 or the air outlet box 2, a control valve is respectively arranged on the air inlet box 7 and the air inlet box 2, a control structure is respectively arranged on the air inlet box 7, the air inlet box 2 and the air inlet box 2 is provided with an air inlet box 8, and an air inlet box 7, and an air outlet box 7 is respectively, and an air inlet box structure is respectively, and a valve structure is respectively and a valve 3 and is respectively and is convenient, and a valve and is respectively, and a valve and 3 and is convenient; the box body air inlet pipeline 7 is communicated with a pretreatment box body 27 for carrying out sampling pretreatment on sampling gas through a quick-insertion structure, and the pretreatment box body 27 is connected with a copper exhaust pipe 33 through the quick-insertion structure; and a replacement connecting pipeline with a valve is also connected between the air inlet box and the air outlet box.
In this embodiment, the air inlet box 1, the sampling box 2 and the air outlet box 3 are rectangular structures with the same cross section size, and can be stacked, detachably and fixedly arranged in sequence, the locking structure comprises a groove seat 10 fixedly arranged on the air inlet box 1 and the air outlet box 3 and a lock seat 11 fixed on the sampling box 2, the lock seat 11 is provided with a lock body 12 rotating around a pin shaft fixed on the lock seat 11, the lock body 12 is hinged with a locking ring 13 corresponding to the groove seat 10, the locking ring 13 is buckled on the groove seat 10, then the lock body 12 is covered on the lock seat 11 by rotating the lock body 12, and the locking ring 13 firmly buckles the groove seat 10, so that the air inlet box 1 and the sampling box 2 or the air outlet box 3 and the sampling box 2 are firmly pressed and fixed.
Further, an air inlet 28 and an air outlet 29 are formed in the pretreatment box 27, a box air inlet pipeline 30 and a box air outlet pipeline 31 are arranged at the air inlet 28 and the air outlet 29, the box air inlet pipeline 7 is communicated with the box air outlet pipeline 31 through a quick-insertion structure, pretreatment valves 32 which are convenient to open and close are arranged on the box air inlet pipeline 30 and the box air outlet pipeline 31, the ends of the box air inlet pipeline 30 and the box air outlet pipeline 31 are of a quick-insertion structure, a pretreatment pipe communicated with the air inlet 28 and the air outlet 29 is formed in the pretreatment box 27, the pretreatment pipe comprises a heating part and a condensing part, the heating part is positioned at the upstream of the condensing part, a condensate collecting port 39 is arranged at the low position of the condensing part, a condensate collecting bottle 40 which is convenient to disassemble and assemble is arranged at the condensate collecting port 39, and an exhaust pipe 33 is connected to the box air inlet pipeline through the quick-insertion structure; the exhaust pipe 33 is generally made of brass.
The quick-insertion structure comprises a gas quick connector 23, the ends of a box body air inlet pipeline 30 and a box body air inlet pipeline 7 are connected with a male head or a female head of the gas quick connector 23, the ends of a box body air outlet pipeline 31 and a box body air outlet pipeline 8 are the same, and meanwhile, an exhaust pipe 33 is provided with the female head or the male head which is matched with the gas quick connector 23 at the position of the box body air inlet pipeline 30, so that quick disassembly can be completed, and the efficiency is improved.
As shown in fig. 4, the air intake box 1 includes an air intake chamber 14, a plurality of air intake conveying holes 141 are formed in the air intake chamber 14, each air intake conveying hole 141 is correspondingly communicated with the air intake conveying channel 15, an upper guiding chute 16 for compacting and sealing the sampling tube 5 is formed at the lower end of the air intake conveying channel 15, and the air intake pipeline 7 of the box body is communicated with the air intake chamber 14; the air inlet conveying holes 141 are connected with the electromagnetic control valves 24 in a one-to-one correspondence manner, the electromagnetic control valves 24 are connected with the corresponding air inlet conveying channels 15 again, so that sampling gas can enter any one air inlet conveying channel 15, the upper end of the sampling tube 5 contacts with the upper guide chute 16 to finish the connection sealing of the upper end of the sampling tube 5, a single sampling tube 5 is required to sample during sampling, and therefore, only any electromagnetic control valve 24 is required to be opened during sampling, and the sampling gas can enter the corresponding sampling tube 5, so that the sampling is finished.
Further, the air outlet box 3 includes an air outlet chamber 17, a plurality of air outlet conveying holes 18 are formed in the air outlet chamber 17, each air outlet conveying hole 18 is correspondingly communicated with the air outlet conveying channel 20, a lower guiding chute 19 for compacting the sealed sampling tube 5 is formed at the upper end part of the air outlet conveying channel 20, and the box air outlet pipeline 8 is communicated with the air outlet chamber 17; after the electromagnetic control valve 24 in the air inlet box 1 is opened, the electromagnetic control valve 24 in the corresponding air outlet box 3 is also required to be synchronously opened, after the electromagnetic control valve 24 is opened, the volatile organic compounds are absorbed by the absorption filler in the sampling tube 5, the residual air is discharged from the sampling tube 5, then enters the air outlet cavity 17 through the air outlet conveying channel 20 and is discharged from the box air outlet pipeline 8, and the lower end of the sampling tube 5 is in contact seal with the lower guide chute 19 because the air outlet box 3 and the air inlet box 1 are identical in structure, so that the sampling tube 5 is communicated with the air outlet conveying channel 20, and the air outlet conveying channel 20 is sequentially communicated with the electromagnetic control valve 24 and the air outlet conveying hole 18.
As shown in fig. 1, the replacement connection pipeline includes a first replacement pipeline 41 connected to the air inlet chamber 14 and a second replacement pipeline 42 connected to the air outlet chamber 17, the first replacement pipeline 41 and the second replacement pipeline 42 are both provided with an openable valve and a gas quick connector 23, the valve is a ball valve 44, so that the first replacement pipeline 41 and the second replacement pipeline 42 can be quickly and conveniently closed, a communication pipeline 43 is arranged between the first replacement pipeline 41 and the second replacement pipeline 42, the first replacement pipeline 41 and the second replacement pipeline 42 can be connected through the communication pipeline, and the mutual disassembly among the air inlet box 1, the air outlet box 3 and the sampling box 2 is not affected.
The electromagnetic control valve 24 is controlled to be opened and closed accurately and effectively, the tedious operation of manually opening and closing one by one is omitted, the efficiency is improved, and the control screen 25 for controlling the electromagnetic control valve 24 to be opened and closed is arranged on the air inlet box 1, and the sampling sequence is required to be marked as the sampling tube 5 is sampled one by one during sampling, so that the subsequent detection is convenient, the sampling tube 5 and the electromagnetic control valve 24 can be displayed on the screen through the control screen 25 for convenient observation and operation, other operations can be carried out on the control screen 25, and the working efficiency is greatly improved.
Further, the lower guiding chute 19 and the upper guiding chute 16 are both conical grooves, so that the sampling tube 5 can be adjusted along the inclined plane of the conical grooves when the sampling tube 5 is installed, when the sampling tube 5 is assembled, the sampling box 2 and the air outlet box 3 are effectively fixed, then the sampling tube 5 is sequentially placed into the heating sleeve 4, the lower end of the sampling tube 5 is firstly contacted with the lower guiding chute 19, then the air inlet box 1 is installed on the sampling box 2, and the upper guiding chute 16 can press the sampling tube 5 after the upper guiding chute 16 is contacted with the upper end of the sampling tube 5, so that the sampling tube 5 can be in a vertical state, and thus, the sampling tube 5 is effectively and hermetically connected with the air inlet conveying channel 15 and the air outlet conveying channel 20, and the installation of the sampling tube 5 is completed.
In this embodiment, the nitrogen tank 6 is provided with a purge pipe 22 extending into the air inlet chamber 14, and the purge pipe 22 is also provided with a quick-insertion structure which is convenient to disassemble and assemble; elastic washers 21 which are in contact with the sampling tube 5 are arranged on the upper guide chute 16 and the lower guide chute 19; the nitrogen tank 6 and the sampling pipe 5 are installed jointly in the sampling box 2, space can be effectively saved, the height of the heating sleeve 4 is smaller than that of the sampling pipe 5, the purging pipeline 22 is a hose, after the valve for opening and closing is also arranged on the purging pipeline 22, when the air inlet box 1 and the sampling box 2 are separated, the valve is closed, the nitrogen tank 6 and the air inlet chamber 14 are disconnected through the quick-inserting structure, when the air inlet box 1 and the sampling box 2 are required to be installed together, the nitrogen tank 6 and the air inlet chamber 14 are only required to be connected through the quick-inserting structure, and when the sampling pipe 5 is installed, the elastic gasket 21 is adopted, so that the two ends of the sampling pipe 5 are further effectively pressed and sealed, and the sampling efficiency is improved.
As shown in fig. 3, the pretreatment pipe is a U-shaped pipe, the heating part comprises a heating pipe section 34 which is positioned on the U-shaped pipe and is communicated with the air inlet 28, a heating wire 35 is arranged on the heating pipe section 34, the condensing part comprises a condensing pipe section 36 which is communicated with the downstream of the heating pipe section 34, a condensing device for actively cooling is arranged on the condensing pipe section 36, an exhaust pipe section 37 is communicated with the downstream of the condensing pipe section 36, and the exhaust pipe section 37 is communicated with the air outlet 29; the pretreatment box 27 is a rectangular box, the heating pipe section 34, the condensation pipe section 36 and the exhaust pipe section 37 together form a U-shape, the heating pipe section 34 comprises a section extending from the air inlet 28 horizontally and a section with one end vertically downward, the heating pipe section 34 can be effectively heated by winding the heating wire 35 on the heating pipe section 34, the U-shaped pipe can effectively help the condensate generated by the condensation pipe section 36 during condensation to be effectively accumulated, the collection is convenient, the sampling gas can be effectively discharged from the exhaust pipe section 37, and the structure is more reasonable.
Further, the condensation pipe 36 includes a first pipe section 361 and a second pipe section 362, where the first pipe section 361 is higher than the second pipe section 362, the first pipe section 361 and the second pipe section 362 are communicated through a diversion pipe section 363, and condensation devices are disposed on the first pipe section 361, the second pipe section 362 and the diversion pipe section 363; the condensing unit includes a semiconductor refrigeration sheet 38, the semiconductor refrigeration sheet 38 is fixedly installed on the side walls of the first pipe section 361, the second pipe section 362 and the diversion pipe section 363, so that the temperature of the sampled gas flowing through the first pipe section 361, the second pipe section 362 and the diversion pipe section 363 can be reduced, the first pipe section 361 and the second pipe section 362 are vertically installed, the first pipe section 361 is connected to the downstream end of the heating pipe section 34, the first pipe section 361 is higher than the second pipe section 362, the diversion pipe section 363 is communicated with the first pipe section 361 and the second pipe section 362, the diversion pipe section 363 is in an inclined state, so that condensate is convenient to flow, the second pipe section 362 is fixedly installed at the bottom of the pretreatment box 27, and meanwhile, the condensate collecting port 39 is arranged at the bottom of the second pipe section 362, and the condensate collecting port 39 and the condensate collecting bottle 40 are fixedly connected through threads.
The condensate collecting opening 39 penetrates through the second pipe section 362 and the pretreatment box body 27, so that the condensate collecting bottle 40 can be installed outside the pretreatment box body 27 and connected with the second pipe section 362, and the condensate collecting bottle 40 can be quickly and conveniently detached by rotating the condensate collecting bottle 40, and the replacement convenience is improved.
In this embodiment, the heating wire 35 that facilitates heating is also disposed on the exhaust tube 33, and since the exhaust tube 33 is made of brass, heating at a certain temperature can be performed, so as to achieve the effect of preheating in advance, and ensure that the sampled gas is heated well.
Further, the diameter of the heating pipe section 34 is smaller than that of the condensing pipe section 36, so that after the sampled gas enters the heating pipe section 34, the space is small, the heating pipe section 34 is convenient to be heated, the temperature of the sampled gas is fast to rise, and then after the sampled gas enters the condensing pipe section 36, the space is enlarged, the heat dissipation effect is good, and the cooling speed can be increased by matching with the semiconductor refrigerating sheet 38, so that the sampled gas is dried.
Still further, the inner wall of the exhaust tube 33 is covered with an inert coating through inert treatment, so that the inside of the exhaust tube 33 is smooth and durable, and the reaction or adhesion of volatile organic compounds in the sampling gas and the inner wall of the exhaust tube 33 are prevented, thereby affecting the subsequent detection.
As shown in FIG. 4, the air inlet box 1 is rotatably provided with a handle 26 which is convenient to grasp, the storage box is integrally moved after collection, and the sampling tube 5 is positioned in the sampling box 2, so that the storage is convenient, and the efficiency is improved, but because the sampling tube 5 needs to be stored and moved to a designated place for detection after collection is completed, the sampling tube 5 is positioned in the storage box and can be effectively protected, and the storage box can be integrally moved through the grabbing handle 26 during movement, so that the convenience is improved.
The above examples are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and adaptations of the technical solution of the present invention should and are intended to fall within the scope of the present invention as defined in the claims.
Claims (6)
1. A volatile organic compound sampling detection method is characterized in that: the volatile organic compound sampling method comprises the following steps:
the device comprises a preservation box body, a pretreatment box body and an exhaust pipe, wherein the preservation box body, the pretreatment box body and the exhaust pipe are sequentially communicated, the preservation box body comprises an air inlet box, a sampling box and an air outlet box, the sampling box and the air inlet box are sequentially stacked and detachably mounted and fixed, a plurality of heating sleeves are arranged in the sampling box, corresponding sampling pipes are arranged in the heating sleeves, a nitrogen tank is further arranged in the sampling box, the nitrogen tank is communicated with the air inlet box, an air inlet conveying channel and an air outlet conveying channel which are correspondingly and hermetically matched with two ends of the sampling pipes are respectively arranged in the air inlet box and the air outlet box, electromagnetic control valves which are convenient to open or close are respectively arranged on the air inlet box, the air inlet conveying channel and the air outlet conveying channel, the air outlet box and the air inlet box are identical in structure, a lock catch structure is arranged between the sampling box and the air inlet box, a corresponding sampling pipe is arranged in the heating sleeve, an air inlet pipeline is arranged on the air inlet box, an air inlet pipeline is convenient to open and close to the air inlet pipeline is arranged on the air inlet box, and an air inlet pipeline is convenient to open and close the air inlet pipeline is arranged on the air inlet pipeline, and the air inlet pipeline is convenient to open and close to the air inlet pipeline is arranged on the air inlet pipeline; the box body air inlet pipe is communicated with a pretreatment box body for carrying out sampling pretreatment on sampling gas through a quick-insertion structure, the pretreatment box body is connected with a copper exhaust pipe through the quick-insertion structure, and a replacement connection pipe with a valve is further connected between the air inlet box and the air outlet box;
S2, placing an exhaust pipe at a sampling point, connecting an exhaust pump with an exhaust pipeline of the box body, and closing a valve on the replacement connecting pipeline; opening flow control valves on an air inlet pipeline and an air outlet pipeline of the box body, and then opening first electromagnetic control valves corresponding to two ends of a first sampling pipe in the air inlet box and the air outlet box;
s3, the air pump works, and sampling gas enters the pretreatment box body from the air extraction pipe to carry out pretreatment procedures;
s4, after the pretreatment box body finishes pretreatment on the sampling gas, the sampling gas enters the air inlet box from the box body air inlet pipeline;
s5, the sampling gas in the gas inlet box enters the first sampling pipe through a gas inlet conveying channel corresponding to the first sampling pipe for sampling, and after the sampling is finished, the sampling gas enters the gas outlet box through a gas outlet conveying pipeline and is finally discharged from the gas outlet pipeline of the box body;
s6, after the sampling of the first sampling tube is completed, closing the corresponding first electromagnetic control valve, then opening the second electromagnetic control valve corresponding to the two ends of the second sampling tube, repeating S4 to S5 to complete the sampling of the second sampling tube, repeating the steps until the required sampling of all the sampling tubes is completed, and finally closing the electromagnetic control valves corresponding to all the sampling tubes, and stopping the air pump; removing the exhaust pipe from the sampling point, and separating the box body air inlet pipeline from the pretreatment box body; then the preserving box body and the sampling pump are integrally moved into a clean environment, a valve on a replacement connecting pipeline is opened, an air extracting pump is started to continuously extract air, so that external clean air enters the air inlet box, the replacement connecting pipeline and the air outlet box, after the sampling gas in the air inlet box and the sampling gas in the air outlet box are replaced, the air extracting pump stops, the valve on the replacement connecting pipeline is closed, and finally the air outlet pipeline of the box body is separated from the air extracting pump;
S7, moving the preservation box body into a laboratory, and connecting a box body air outlet pipeline and a box body air inlet pipeline with a detection instrument;
s8, opening a heating sleeve corresponding to the designated sampling tube to heat the designated sampling tube; volatile organic matters in the sampling tube begin to volatilize, electromagnetic control valves corresponding to two ends of the designated sampling tube are opened, and the purge gas of the detection instrument blows out the volatile organic matters from a box body air outlet pipeline for detection;
s9, after detection is completed, closing electromagnetic control valves corresponding to two ends of the designated sampling tube, and repeating the step S8 until all volatile organic compounds in the sampling tube are detected, and disconnecting the box body air outlet pipeline from the box body air inlet pipeline from the detection instrument;
s10, all heating sleeves are started to heat all sampling tubes, electromagnetic control valves on a nitrogen tank are opened, nitrogen enters into each sampling tube to purge residual volatile organic compounds, and all sampling tubes are cleaned for use.
2. A volatile organic compound sampling and detecting method as set forth in claim 1, wherein: in the step S2, an air inlet and an air outlet are formed in the pretreatment box body, a box body air inlet pipeline and a box body air outlet pipeline are arranged at the air inlet and the air outlet, the box body air inlet pipeline is communicated with the box body air outlet pipeline through a quick-insertion structure, pretreatment valves which are convenient to open and close are arranged on the box body air inlet pipeline and the box body air outlet pipeline, quick-insertion structures are arranged at the ends of the box body air inlet pipeline and the box body air outlet pipeline, pretreatment pipes communicated with the air inlet and the air outlet are formed in the pretreatment box body, the pretreatment pipes comprise a heating part and a condensing part, the heating part is positioned at the upstream of the condensing part, a condensate collecting opening is formed in the lower position of the condensing part, a condensate collecting bottle which is convenient to disassemble and assemble is arranged at the condensate collecting opening, and an extraction pipe is connected to the box body air inlet pipeline through the quick-insertion structure; the mode that sampling gas enters the pretreatment box body from the exhaust pipe to carry out pretreatment procedures comprises the following steps:
S21, the exhaust pipe is communicated with the box body air inlet pipeline, and sampling gas enters the box body air inlet pipeline;
s22, the sampling gas enters a pretreatment pipe, the heating part heats the sampling gas, and then the condensing part condenses the sampling gas;
s23, after condensation is completed, condensate flows into a condensate collecting bottle, and after sampling gas treatment is completed, the condensate enters a box body air inlet pipeline from a box body air outlet pipeline.
3. A volatile organic compound sampling and detecting method as set forth in claim 2, wherein: in steps S4 and S5, the air inlet box includes an air inlet chamber, the air outlet box includes an air outlet chamber, the air inlet chamber and the air outlet chamber are communicated with all sampling tubes, and the sampling gas can enter the corresponding sampling tubes by opening the corresponding electromagnetic control valves.
4. A volatile organic compound sampling and detecting method as set forth in claim 3, wherein: in the method, the quick-insertion structure comprises a gas quick connector, wherein the gas quick connector is provided with a male head and a female head which are matched with each other, so that the preservation box body, the pretreatment box body and the exhaust pipe are communicated with each other.
5. A volatile organic compound sampling and detecting method as set forth in claim 4, wherein: in the method, a heating wire is arranged on the exhaust pipe, and the sampling gas is primarily heated in the exhaust pipe.
6. A volatile organic compound sampling and detecting method as set forth in claim 5, wherein: the lock catch structure comprises a groove seat fixedly installed on the air inlet box and the air outlet box and a lock seat fixed on the sampling box, a lock body rotating around a pin shaft fixed on the lock seat is arranged on the lock seat, a retaining ring corresponding to the groove seat is hinged to the lock body, the lock body is buckled on the groove seat through the retaining ring, the lock body is rotated, the lock body is covered on the lock seat, the retaining ring buckles the groove seat, the air inlet box is fixedly pressed between the sampling box or the air outlet box and the sampling box, and the sampling pipe forms a seal with the air inlet conveying channel or the air outlet conveying channel.
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