CN211402133U - VOCs binary channels difference detecting system - Google Patents
VOCs binary channels difference detecting system Download PDFInfo
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- CN211402133U CN211402133U CN201921640945.4U CN201921640945U CN211402133U CN 211402133 U CN211402133 U CN 211402133U CN 201921640945 U CN201921640945 U CN 201921640945U CN 211402133 U CN211402133 U CN 211402133U
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Abstract
The application provides a VOCs binary channels difference detecting system, including leading gas circuit and binary channels difference detection air chamber, its characterized in that, leading gas circuit intercommunication binary channels difference detection air chamber. The utility model discloses a VOCs binary channels difference detecting system can be with sameThe secondary collected gas is divided into two paths to be detected simultaneously. One path without pre-processing and one path with CO2Detecting the content, wherein the obtained value is the background amount; the other path is converted by a converter to convert VOCs in the gas into CO2Then CO is carried out2And detecting the content, wherein the obtained value is the background amount plus increment. And finally, carrying out differential analysis on the results of the two to obtain the total VOCs value.
Description
Technical Field
The utility model belongs to the technical field of gaseous detection and specifically relates to a VOCs binary channels difference detecting system.
Background
In the existing Volatile Organic Compounds (VOCs) detector, the product adopting the infrared spectrum detection technology has the advantage of high response speed. The products mainly use a single light source detection channel to detect CO in an unprocessed state of gas in a time-sharing manner2Content (wt.)
And CO after conversion by reaction2Content (wt.)
However, due to the influence factors such as light source change, temperature change and the like in the infrared detection, the detection result
And
should be the actual value of
And
wherein
And
it is the true gas component content value. VE1And VE2Is the amount of interference just mentioned and is different at different times. Therefore, the content value V of VOCs in the gas is actually detectedHC＝VCO2-VC′O2＝(V1CO2-V2CO2)+(VE1-VE2) And V isE1-VE2Not equal to 0, this results in data skew.
Disclosure of Invention
For overcoming current defect, the utility model provides a VOCs binary channels difference detecting system.
A VOCs two-channel differential detection system comprises a preposed gas circuit and a two-channel differential detection gas chamber, wherein the preposed gas circuit is communicated with the two-channel differential detection gas chamber.
The front gas path comprises a sampling channel, a filter, a sampling pump, a flowmeter and a converter, wherein the sampling channel is communicated with the sampling pump through the filter; the other path is communicated with a second flowmeter and a second air inlet of the double-channel differential detection air chamber.
The two-channel differential detection air chamber comprises two air inlet ports, a light source, a lens, an air outlet of the air pipe chamber and a detector, wherein a first air inlet port is formed in one end of the first air pipe chamber, and a first lens is arranged at one end of the first air inlet port; the other end of the first air pipe chamber is provided with a first air outlet, one side of the first air outlet is provided with a second lens, and one side of the second lens is provided with a first detector.
In the trachea chamber, one end of the second trachea chamber is provided with a second air inlet, and one end of the second air inlet is provided with a fourth lens; the other end of the second air pipe chamber is provided with a second air outlet, one side of the second air outlet is provided with a third lens, and one side of the third lens is provided with a second detector.
Optionally, a third light source is disposed on one side of the first lens and the second lens.
Optionally, a first light source is arranged on one side of the first lens; one side of the second lens is provided with a second light source.
The utility model discloses a VOCs binary channels difference detecting system can separately detect two tunnel simultaneously with the gas of once gathering. One path without pre-processing and one path with CO2Detecting the content, wherein the obtained value is the background amount; the other path isConverting VOCs in the gas into CO by the conversion of the converter2Then CO is carried out2And detecting the content, wherein the obtained value is the background amount plus increment. And finally, carrying out differential analysis on the results of the two to obtain the total VOCs value.
Drawings
Fig. 1 is a schematic structural diagram of a two-channel differential detection system for VOCs.
Fig. 2 is a schematic diagram of an optical path of a two-channel differential detection system for VOCs.
Fig. 3 is a schematic diagram of another gas chamber structure of the VOCs dual-channel differential detection system.
Detailed Description
The following describes a two-channel differential detection system for VOCs according to the present invention in detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 and 2 show a two-channel differential detection system for VOCs, which comprises a front-mounted gas circuit, a two-channel differential detection gas chamber and a two-channel differential detection gas chamber communicated with the front-mounted gas circuit.
The preposed gas path comprises a sampling channel 1, a filter 2, a sampling pump 3, a flowmeter and a conversion furnace 5, wherein the sampling channel 1 is communicated with the sampling pump 3 through the filter 2, the rear end of the sampling pump 3 is divided into two branches, one branch is communicated with the conversion furnace 5 through a first flowmeter 41, and the conversion furnace 5 is communicated with a first gas inlet 61 of a two-channel differential detection gas chamber; the other path is communicated with the second flowmeter 42 and communicated with a second air inlet 62 of the two-channel differential detection air chamber.
The double-channel differential detection air chamber comprises air inlets, a light source, lenses, an air outlet of the air chamber and a detector, wherein the number of the air chamber is two, one end of the first air chamber 101 is provided with a first air inlet 61, and one end of the first air inlet 61 is provided with a first lens 91; the other end of the first air duct chamber 101 is provided with a first air outlet 111, a second lens 92 is arranged on the side of the first air outlet 111, and a first detector 121 is arranged on the side of the second lens 92.
A second air inlet 62 is arranged at one end of the second air tube chamber 102, and a fourth lens 94 is arranged at one end of the second air inlet 62; the other end of the second air duct chamber 102 is provided with a second air outlet 112, a third lens 93 is arranged on one side of the second air outlet 112, and a second detector 122 is arranged on one side of the third lens 93.
The third light source 83 is provided on the first lens 91 and the second lens 94 side.
In another gas cell structure of the dual-channel differential detection system for VOCs shown in fig. 3, a first light source 81 is disposed on one side of a first lens 91; the second light source 82 is disposed on the second lens 94 side.
The gas to be detected is sucked from the sampling channel 1, impurities such as dust and the like are filtered out by the filter 2, and then the gas is divided into two paths after passing through the sampling pump 3, wherein one path of the gas directly leads to the gas inlet 62 of the two-path differential detection gas chamber, and the gas flows through the gas pipe chamber 102 and then is discharged from the gas outlet 112; the other path of the gas passes through a converter 5 to convert VOCs in the gas into CO2Then, the gas enters the other gas inlet 61 of the two-channel differential detection chamber, passes through the gas pipe chamber 101, and is discharged from the gas outlet 111.
In the process, light emitted by the light source 83 shared by the two detection channels passes through the tracheal chambers 101 and 102 after being collimated by the lenses 91 and 94, reaches the lenses 92 and 93 on the other side, is focused and then is projected to the detectors 121 and 122. Wherein the channel of the detector 122 detects the content of the gas 72 to be measured in the channel without pre-processing
And the channel of the detector 121 detects CO of the gas 71 to be measured converted in the channel2Content (wt.)
Because the same light source is used for simultaneous measurement, the interference amount caused by the influence factors such as light source change, temperature change and the like in the detection result is the same under the ideal state. I.e. the content of VOCs in the gas can be determined from the formula VHC＝VCO2-V′CO2＝(V1CO2-V2CO2)+(VE1-VE2) To obtain wherein
And V2CO2Is a true value, and the difference V of two interference quantitiesE1-VE20. The result thus differentiated is more accurate.
In another aspect of the present invention, two light sources 81, 82 in close state may be used in place of the light source 83 to reduce errors.
Finally, it should be noted that the above examples are only intended to describe the technical solutions of the present invention and not to limit the technical methods, the present invention can be extended in application to other modifications, variations, applications and embodiments, and therefore all such modifications, variations, applications, embodiments are considered to be within the spirit and teaching scope of the present invention.
Claims (5)
1. A VOCs double-channel differential detection system comprises a preposed gas path and a double-channel differential detection gas chamber, and is characterized in that the preposed gas path is communicated with the double-channel differential detection gas chamber,
the preposed gas path comprises a sampling channel (1), a filter (2), a sampling pump (3), a flowmeter and a converter furnace (5), wherein the sampling channel (1) is communicated with the sampling pump (3) through the filter (2), the rear end of the sampling pump (3) is divided into two branches, one branch is communicated with the converter furnace (5) through a first flowmeter (41), and the converter furnace (5) is communicated with a first gas inlet (61) of a two-channel differential detection gas chamber; the other path is communicated with a second air inlet (62) of the two-channel differential detection air chamber through a second flowmeter (42).
2. The dual-channel differential detection system for VOCs according to claim 1, wherein the dual-channel differential detection plenum comprises two air inlets, a light source, a lens, an air outlet of the air plenum, and a detector, wherein a first air inlet (61) is provided at one end of the first air plenum (101), and a first lens (91) is provided at one end of the first air inlet (61); the other end of the first air pipe chamber (101) is provided with a first air outlet (111), one side of the first air outlet (111) is provided with a second lens (92), and one side of the second lens (92) is provided with a first detector (121).
3. The dual channel differential detection system for VOCs of claim 2 wherein the second gas inlet (62) is disposed at one end of the second gas chamber (102) and the fourth lens (94) is disposed at one end of the second gas inlet (62); the other end of the second air pipe chamber (102) is provided with a second air outlet (112), one side of the second air outlet (112) is provided with a third lens (93), and one side of the third lens (93) is provided with a second detector (122).
4. The system according to claim 2 or 3, wherein a third light source (83) is disposed on one side of the first lens (91) and the second lens (92).
5. The dual channel differential detection system for VOCs as claimed in claim 2 or 3 wherein said first lens (91) is configured with a first light source (81) on one side; a second light source (82) is provided on the second lens (92) side.
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| CN201921640945.4U CN211402133U (en) | 2019-09-29 | 2019-09-29 | VOCs binary channels difference detecting system |
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| CN201921640945.4U CN211402133U (en) | 2019-09-29 | 2019-09-29 | VOCs binary channels difference detecting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514379A (en) * | 2021-06-15 | 2021-10-19 | 杭州谱育科技发展有限公司 | Particulate matter detection method based on dual-channel technology |
| CN113514379B (en) * | 2021-06-15 | 2024-05-14 | 杭州谱育科技发展有限公司 | Particulate matter detection method based on double-channel technology |
-
2019
- 2019-09-29 CN CN201921640945.4U patent/CN211402133U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514379A (en) * | 2021-06-15 | 2021-10-19 | 杭州谱育科技发展有限公司 | Particulate matter detection method based on dual-channel technology |
| CN113514379B (en) * | 2021-06-15 | 2024-05-14 | 杭州谱育科技发展有限公司 | Particulate matter detection method based on double-channel technology |
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