CN212621747U - VOCs preliminary treatment and detecting system - Google Patents
VOCs preliminary treatment and detecting system Download PDFInfo
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- CN212621747U CN212621747U CN202021060874.3U CN202021060874U CN212621747U CN 212621747 U CN212621747 U CN 212621747U CN 202021060874 U CN202021060874 U CN 202021060874U CN 212621747 U CN212621747 U CN 212621747U
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000005070 sampling Methods 0.000 claims abstract description 25
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 5
- 238000007781 pre-processing Methods 0.000 claims description 3
- 230000002452 interceptive effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 130
- 239000000523 sample Substances 0.000 description 52
- 238000004817 gas chromatography Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008676 import Effects 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Abstract
The utility model discloses a VOCs preliminary treatment and detecting system, include: the sampling device is used for collecting sample gas; the sampling device is connected with the first end of the first valve through a first pipeline; the first end of the second pipeline is connected with the second end of the first valve; the first end of the third pipeline is connected with the second end of the second pipeline; the second end of the third pipeline is connected with a detection instrument; the first end of the fourth pipeline is connected with the second end of the second pipeline; the first end of the second valve is connected with the second end of the fourth pipeline, and the second end of the second valve is communicated with calibration gas; the first discharge pipeline is connected with the first pipeline; the second discharge pipeline is connected with the second end of the second valve; before calibration: opening the second valve to discharge the sample gas in the second pipeline through the first valve and the first discharge pipeline; before re-detection: opening the first valve discharges the calibration gas in the fourth line through the second valve and the second discharge line. The system can remove residual sampling gas and calibration gas to prevent the residual sampling gas and the calibration gas from interfering the calibration of a detection instrument and the detection of the sampling gas, and solve the problem of detection deviation.
Description
Technical Field
The utility model discloses VOCs monitoring technology belongs to the field, especially relates to a VOCs preliminary treatment and detecting system.
Background
With the continuous development of industry, environmental problems are increased, and people reduce or reduce environmental pollution in various ways. Currently, inhalable particulate matter has become a significant source of air quality hazard, and Volatile Organic Compounds (VOCs) are a large source of constituting inhalable particulate matter. At present, VOCs mainly come from industrial production, such as spray painting, printing, metal oil removal and degreasing, adhesives and the like, and volatile organic compounds are not available to pollute air at all times. In order to maintain the air quality in the environment, the detection and treatment of VOCs are widely popularized by the environmental protection agency.
In the VOCs pretreatment system on the market at present, the problem of calibration deviation or detection deviation caused by residual interference gas (sampling gas or calibration gas) exists, and the interference gas can be continuously diffused and mixed with the sampling gas or the calibration gas to cause interference. The fundamental reason for this is that there is a "dead space" in the system, which results in the presence of interfering gases that remain in the calibration or detection process.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model aims at providing a VOCs preliminary treatment and detecting system, this system can realize cleaing away remaining sampling gas and calibration gas to prevent its calibration and the gaseous detection of sampling that disturbs detecting instrument, solve and detect the deviation problem.
In order to achieve the above purpose, the technical scheme of the utility model is that:
a system for pre-processing and detecting VOCs, comprising:
the sampling device is used for collecting sample gas;
the sampling device is connected with a first end of the first valve through a first pipeline;
a second line, a first end of the second line being connected to a second end of the first valve;
a first end of the third pipeline is connected with a second end of the second pipeline;
the second end of the three pipelines is connected with the detection instrument;
a first end of the fourth pipeline is connected with a second end of the second pipeline;
a first end of the second valve is connected with a second end of the fourth pipeline, and a second end of the second valve is filled with calibration gas;
a first discharge line connected to the first line;
a second discharge line connected to a second end of the second valve;
before calibrating the detection instrument: opening the second valve to introduce the calibration gas, and discharging the sample gas in the second pipeline through the first valve and the first discharge pipeline to prevent interference in calibration;
before the calibration is completed and the detection is carried out again: and opening the first valve to introduce the sample gas from the sampling device, and discharging the calibration gas in the fourth pipeline through the second valve and the second discharge pipeline so as to prevent the interference of detection.
According to the utility model discloses an embodiment, calibration gas passes through the first import of the first three-way valve of tube coupling, the second access connection of first three-way valve the second discharges the pipeline, the exit linkage of first three-way valve the second end of second valve.
According to an embodiment of the present invention, the calibration gas is a zero gas or a standard gas.
According to the utility model discloses an embodiment, including being used for the storage standard gas's storage vessel with be used for generating zero gas generator of zero gas, storage vessel with zero gas generator all passes through the first import and the second import of tube coupling second three-way valve, the export of second three-way valve passes through the first import of tube coupling first three-way valve.
According to an embodiment of the present invention, the first valve and the second valve are stop valves.
According to the utility model discloses an embodiment, first exhaust pipe way is equipped with the governing valve.
According to the utility model discloses an embodiment, first pipeline is equipped with the pump, just first discharge line connect in the pump with between the first valve on the first pipeline.
According to the utility model discloses an embodiment, first pipeline the pump first valve the second pipeline with the third pipeline all locates the companion's heat in the high temperature box.
According to an embodiment of the present invention, the pump is a high temperature pump.
According to the utility model discloses an embodiment, detecting instrument's exit linkage the second discharge line.
The utility model discloses owing to adopt above technical scheme, make it compare with prior art and have following advantage and positive effect:
(1) in the embodiment of the utility model, by arranging the first valve, the second valve, the first discharge pipeline and the second discharge pipeline, the sample gas in the 'dead zone' second pipeline can be discharged through the first valve and the first discharge pipeline before the calibration of the detection instrument so as to prevent the interference with the calibration, because the sample gas in the second pipeline can remain in the second pipeline all the time if the sample gas in the second pipeline is not discharged, the sample gas in the second pipeline can diffuse to the third pipeline and mix with the calibration gas to interfere the calibration during the calibration; similarly, the calibration gas in the "dead zone" fourth line before re-testing after calibration is complete may be vented through the second valve and the second vent line to prevent mixing with the sample gas from interfering with testing.
(2) The embodiment of the utility model provides an in make the second valve can select to discharge the pipeline intercommunication with calibration gas intercommunication or with the second through setting up first three-way valve for calibration gas bypass and second discharge pipeline bypass separate and make noninterference each other.
(3) The embodiment of the utility model provides an in first discharge line is equipped with the governing valve, can play the effect of adjusting appearance atmospheric pressure in first pipeline, second pipeline and the third pipeline.
Drawings
The following detailed description of embodiments of the present invention is provided with reference to the accompanying drawings, in which:
fig. 1 is the overall schematic diagram of the utility model discloses a VOCs pretreatment and detection system.
Description of reference numerals:
1: a sampling device; 2: a first valve; 3: a first pipeline; 4: a second pipeline; 5: a third pipeline; 6: a gas chromatography analyzer; 7: a fourth pipeline; 8: a second valve; 9: a first discharge line; 10: a second discharge line; 11: a first three-way valve; 12: a storage container; 13: a zero gas generator; 14: a second three-way valve; 15: adjusting a valve; 16: a pump; 17: a high temperature chamber; 18: a delivery conduit; 19: a pump head; 20: a hydrogen generator.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It is to be noted that the drawings are in a very simplified form and are not to be construed as precise ratios as are merely intended to facilitate and distinctly illustrate the embodiments of the present invention.
Referring to fig. 1, the core of the present invention is to provide a VOCs preprocessing and detecting system, including sampling device 1, first valve 2, second pipeline 4, third pipeline 5, detecting instrument, fourth pipeline 7, second valve 8, first discharge line 9 and second discharge line 10, make the sample gas in "dead zone" second pipeline 4 can be discharged through first valve 2 and first discharge line 9 before the detecting instrument is calibrated in order to prevent disturbing the calibration, cause the calibration deviation, also make the calibration gas in "dead zone" fourth pipeline 7 can be discharged through second valve 8 and second discharge line 10 before retesting after the calibration is accomplished, in order to prevent detecting with sample gas mixing interference, cause the detection deviation.
A pump 16 is also provided on the first line 3, and a pump head 19 is connected in series in the first line 3. The first discharge line 9 is connected to the first line 3, and the first discharge line 9 is connected to the first line 3 between the pump 16 and the first valve 2 for discharging the excess sample gas.
Furthermore, the first discharge pipeline 9 is also provided with a regulating valve 15, which is a needle valve in the embodiment, so that the regulating precision is higher. The regulating valve 15 has the function of regulating the pressure of the sample gas in the first pipeline 3, the second pipeline 4 and the third pipeline 5, a part of sample gas is discharged from the regulating valve 15 as waste gas, the flow of the sample gas discharged from the first discharge pipeline 9 can be regulated only by regulating the opening size of the regulating valve 15, and the pressure and the flow of the pipeline in the system can be regulated by regulating the flow of the discharged sample gas.
The first end of second pipeline 4 is connected the second end of first valve 2, and the second end of second pipeline 4 is connected to the first end of third pipeline 5, and the second end of third pipeline 5 connects detecting instrument, and detecting instrument is gas chromatography appearance 6.
Correspondingly, a hydrogen generator 20 for igniting the gas chromatograph 6 is provided for generating hydrogen and supplying it to the gas chromatograph 6 for ignition.
The first end of the fourth pipeline 7 is connected to the second end of the second pipeline 4, that is, the second pipeline 4, the third pipeline 5 and the fourth pipeline 7 intersect and are communicated with each other through a three-way joint.
The second end of the fourth pipeline 7 is connected to the first end of the second valve 8, in this embodiment, the second valve 8 is also a stop valve, the second end of the second valve 8 is communicated with the calibration gas, specifically, the second end of the second valve 8 is connected to the outlet of a first three-way valve 11, the calibration gas is connected to the first inlet of the first three-way valve 11 through a pipeline, the second inlet of the first three-way valve 11 is connected to a second discharge pipeline 10, that is, the second end of the second valve 8 can be selectively communicated with the calibration gas or the second discharge pipeline 10 through the first three-way valve 11.
Before calibrating the detection instrument: the second valve 8 is opened to introduce calibration gas and the sample gas in the second line 4 is vented through the first valve 2 and the first vent line 9 to prevent interference with calibration.
Specifically, need calibrate gas chromatography appearance 6 after the detection to sample gas through a period of time, calibration method is for passing through calibration gas to gas chromatography appearance 6 in proper order fourth pipeline 7 and third pipeline 5 and calibrates, and the first certain amount of calibration gas that lets in before the calibration promotes the export of remaining sample gas in fourth pipeline 7 and the third pipeline 5 through gas chromatography appearance 6 and discharges to prevent to disturb the calibration.
However, the sample gas in the "dead zone" second pipeline 4 and the first pipeline 3 cannot be pushed to be discharged by the calibration gas, and the sample gas in the second pipeline 4 can diffuse to the third pipeline 5 to be mixed with the calibration gas in the calibration process, so that the contaminated calibration gas enters the gas chromatograph 6 to interfere the calibration, and the calibration has deviation, and the accuracy of detection is finally influenced. Therefore, the first valve 2 and the first discharge pipeline 9 are arranged, the first valve 2 is opened before calibration, the calibration gas pushes and discharges the sample gas through the fourth pipeline 7, the second pipeline 4, the first valve 2, the first pipeline 3 and the first discharge pipeline 9, and then the first valve 2 is closed for calibration.
And only need discharge "dead zone" second pipeline 4 after setting up first valve 2 in the sample gas can, and need not discharge the sample gas in first pipeline 3, practiced thrift calibration gas's quantity greatly, and saved calibration time.
Before the calibration is completed and the detection is carried out again: the first valve 2 is opened to introduce sample gas from the sampling device 1 and the calibration gas in the fourth line 7 is vented through the second valve 8 and the second vent line 10 to prevent interference with the test.
Specifically, before re-detection, a certain amount of sample gas is introduced to push the calibration gas in the second pipeline 4 and the third pipeline 5 to be discharged through the outlet of the gas chromatograph 6, so as to prevent interference with the detection at the beginning.
However, the calibration gas in the "dead zone" fourth pipeline 7 cannot be pushed to be discharged by the sample gas, the sample gas in the fourth pipeline 7 can diffuse to the third pipeline 5 to be mixed with the sample gas in the detection process, so that the sample gas is polluted by the calibration gas, sampling deviation is caused, the polluted sample gas enters the gas chromatograph 6 to interfere the detection of the VOCs, and the accuracy of the detection is affected, therefore, the second valve 8 and the second discharge pipeline 10 are arranged, the second valve 8 is opened before the re-detection, the first three-way valve 11 is adjusted to be communicated with the second valve 8 and the second discharge pipeline 10, and the sample gas enters the fourth pipeline 7 to push the calibration gas to be discharged through the second valve 8, the first three-way valve 11 and the discharge pipeline.
And because the second valve 8 is arranged, only the calibration gas in the fourth pipeline 7 and the first three-way valve 11 needs to be discharged, and the calibration gas in the whole pipeline which is filled with the calibration gas does not need to be discharged, so that the steps and the time are saved.
Further, an outlet of the gas chromatograph 6 is connected to a second discharge line 10, and the exhaust gas can be discharged through the second discharge line 10.
In this embodiment, the calibration gas is a zero gas or a standard gas. Specifically, the zero gas calibration device comprises a storage container 12 for storing standard gas and a zero gas generator 13 for generating zero gas, wherein the storage container 12 and the zero gas generator 13 are connected with a first inlet and a second inlet of a second three-way valve 14 through pipelines, an outlet of the second three-way valve 14 is connected with a first inlet of a first three-way valve 11 through a pipeline, and zero gas or standard gas can be selectively introduced through the second three-way valve 14 to perform zero gas calibration and standard gas calibration respectively.
Further, the first pipeline 3, the pump 16, the first valve 2, the second pipeline 4 and the third pipeline 5 are all arranged in the high-temperature box 17 for heat tracing, so that the temperature of the sample gas entering the gas chromatographic analyzer 6 is consistent with the temperature in the conveying pipeline 18, and the detection result is more accurate. And the corresponding pump 16 is a high temperature pump 16, the first valve 2 also being a high temperature resistant valve.
The working process of the present invention is further explained as follows:
when VOCs detects, firstly, the pump 16 is opened, the first valve 2 is opened, the second valve 8 is closed, sample gas in the conveying pipeline 18 is collected through the sampling probe, the sample gas enters the gas chromatographic analyzer 6 through the first pipeline 3, the first valve 2, the second pipeline 4 and the third pipeline 5 to be detected, and the flow rate of the sample gas in the pipelines is adjusted in real time through the adjusting valve 15.
When calibration of the gas chromatograph 6 is required, the pump 16 is turned off, the storage vessel 12 or the zero gas generator 13 is opened, and opening the first valve 2 and the second valve 8, the first three-way valve 11 is selectively communicated with the second three-way valve 14 and the second valve 8, the zero gas or the standard gas enters the second three-way valve 14, the first three-way valve 11, the second valve 8 and the fourth pipeline 7 in sequence, then get into second pipeline 4 and third pipeline 5 through fourth pipeline 7, discharge the sample gas in second pipeline 4 through first valve 2, first pipeline 3 and first discharge line 9, discharge the sample gas in third pipeline 5 through second discharge line 10 through the export of gas chromatograph 6, wait for a period of time that the sample gas is whole to be discharged after closing first valve 2, be full of zero gas or standard gas in the second pipeline 4 this moment, pure zero gas or standard gas continuously let in gas chromatograph 6 in order to calibrate.
When the calibration is finished and the sample gas detection is restarted, the pump 16, the first valve 2 and the second valve 8 are opened, the first three-way valve 11 is selectively communicated with the second valve 8 and the second discharge pipeline 10, the sample gas enters the second pipeline 4 through the first valve 2, then enters a third pipeline 5 and a fourth pipeline 7 through a second pipeline 4, zero gas or standard gas in the third pipeline 5 is discharged through a second discharge pipeline 10 through an outlet of a gas chromatograph 6, zero gas or standard gas in the fourth pipeline 7 is discharged through a second valve 8, a first three-way valve 11 and a second discharge pipeline 10, the second valve 8 is closed after a period of time, at the moment, the fourth pipeline 7 is filled with sample gas, pure sample gas continuously passes through the gas chromatograph 6 for detection, and the sample gas concentration in the similar time period is close, so that the sample gas diffusion of the fourth pipeline 7 during detection does not influence the detection precision.
The utility model discloses the design has a peculiar inside pipeline cleaning function, solves because the sample gas remains the calibration deviation that leads to and the calibration gas remains the detection deviation problem that leads to, and the influence that significantly reduces detects the sample, and the guarantee high accuracy detects.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, the changes are still within the scope of the present invention if they fall within the scope of the claims and their equivalents.
Claims (10)
1. A system for preprocessing and detecting VOCs, comprising:
the sampling device is used for collecting sample gas;
the sampling device is connected with a first end of the first valve through a first pipeline;
a second line, a first end of the second line being connected to a second end of the first valve;
a first end of the third pipeline is connected with a second end of the second pipeline;
the second end of the three pipelines is connected with the detection instrument;
a first end of the fourth pipeline is connected with a second end of the second pipeline;
a first end of the second valve is connected with a second end of the fourth pipeline, and a second end of the second valve is filled with calibration gas;
a first discharge line connected to the first line;
a second discharge line connected to a second end of the second valve;
before calibrating the detection instrument: opening the second valve to introduce the calibration gas, and discharging the sample gas in the second pipeline through the first valve and the first discharge pipeline to prevent interference in calibration;
before the calibration is completed and the detection is carried out again: and opening the first valve to introduce the sample gas from the sampling device, and discharging the calibration gas in the fourth pipeline through the second valve and the second discharge pipeline so as to prevent the interference of detection.
2. A VOCs pretreatment and detection system according to claim 1, wherein the calibration gas is piped to a first inlet of a first three-way valve, a second inlet of the first three-way valve is piped to the second discharge line, and an outlet of the first three-way valve is piped to a second end of the second valve.
3. The system of claim 2, wherein the calibration gas is zero gas or a standard gas.
4. A VOCs pretreatment and detection system according to claim 3, comprising a storage vessel for storing the standard gas and a zero gas generator for generating the zero gas, wherein the storage vessel and the zero gas generator are each connected to a first inlet and a second inlet of a second three-way valve by a pipeline, and wherein an outlet of the second three-way valve is connected to a first inlet of a first three-way valve by a pipeline.
5. The system of claim 1, wherein the first valve and the second valve are both shut-off valves.
6. The system of claim 1, wherein the first discharge line is provided with a regulating valve.
7. A VOCs pretreatment and detection system according to claim 1, wherein said first line is provided with a pump and said first discharge line is connected to said first line between said pump and said first valve.
8. The system of claim 7, wherein the first line, the pump, the first valve, the second line, and the third line are disposed in a high temperature tank for heat tracing.
9. The system of claim 8, wherein the pump is a high temperature pump.
10. The system of claim 1, wherein an outlet of the instrumentation is coupled to the second discharge line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021060874.3U CN212621747U (en) | 2020-06-10 | 2020-06-10 | VOCs preliminary treatment and detecting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021060874.3U CN212621747U (en) | 2020-06-10 | 2020-06-10 | VOCs preliminary treatment and detecting system |
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| CN212621747U true CN212621747U (en) | 2021-02-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790893A (en) * | 2021-07-19 | 2021-12-14 | 江铃汽车股份有限公司 | Rapid checking and verifying system and checking and verifying method for discharge equipment |
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2020
- 2020-06-10 CN CN202021060874.3U patent/CN212621747U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790893A (en) * | 2021-07-19 | 2021-12-14 | 江铃汽车股份有限公司 | Rapid checking and verifying system and checking and verifying method for discharge equipment |
| CN113790893B (en) * | 2021-07-19 | 2023-10-20 | 江铃汽车股份有限公司 | Quick check and verification system and check and verification method for discharge equipment |
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Address after: 310053 Room 301, floor 3, building 3, No. 611, Dongguan Road, Binjiang District, Hangzhou, Zhejiang Province Patentee after: Zhongkong Quanshi Technology (Hangzhou) Co.,Ltd. Address before: 310053 Room B3155, 3rd floor, 368 Liuhe Road, Binjiang District, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG TRACETECH TECHNOLOGY CO.,LTD. |