CN114487276A - Method for detecting non-methane total hydrocarbons - Google Patents
Method for detecting non-methane total hydrocarbons Download PDFInfo
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- CN114487276A CN114487276A CN202111633146.6A CN202111633146A CN114487276A CN 114487276 A CN114487276 A CN 114487276A CN 202111633146 A CN202111633146 A CN 202111633146A CN 114487276 A CN114487276 A CN 114487276A
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- methane
- total hydrocarbon
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- detector
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 42
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims description 11
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 14
- 239000010815 organic waste Substances 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 230000003197 catalytic effect Effects 0.000 claims description 7
- 239000003054 catalyst Substances 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 239000002245 particle Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 3
- BIXNGBXQRRXPLM-UHFFFAOYSA-K ruthenium(3+);trichloride;hydrate Chemical compound O.Cl[Ru](Cl)Cl BIXNGBXQRRXPLM-UHFFFAOYSA-K 0.000 description 3
- 239000012080 ambient air Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- YBCAZPLXEGKKFM-UHFFFAOYSA-K ruthenium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Ru+3] YBCAZPLXEGKKFM-UHFFFAOYSA-K 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
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- 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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0047—Organic compounds
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Catalysts (AREA)
Abstract
The invention provides a detection method of non-methane total hydrocarbons, which comprises the following steps: the organic waste gas enters a total hydrocarbon detection flow path, and the detector outputs a total hydrocarbon signal STHC(ii) a Organic waste gas enters a methane detection flow path, non-methane molecules are converted into inorganic substances, methane is reserved, the inorganic substances cannot be detected by the detector, and the detector outputs a methane signal
The analysis unit obtains the non-methane total hydrocarbon content C according to the total hydrocarbon signal and the methane signalNMHC(ii) a The compensation unit is based on the total hydrocarbon content C of non-methaneNMHCTo obtain a compensation content
k is the calibration coefficient for methane and η is the conversion efficiency of non-methane molecules. The invention has the advantages of accurate detection result and the like.
Description
Technical Field
The invention relates to organic waste gas detection, in particular to a method for detecting non-methane total hydrocarbons.
Background
According to GB37822-2019 and HJT55-2000, the unorganized emission control standard of volatile organic compounds in the factory is stipulated, and the unorganized NMHC emission limit value is 4mg/m3. The method adopts NMHC: CH (CH)4When the standard gas calibration instrument is used for measuring the gas with the emission limit critical value, the system error is 1.15% (calculated, the error of 1.0% -1.1% is caused to the final NMHC monitoring data when the catalytic efficiency is reduced by 1% theoretically). However, if the catalytic efficiency is reduced to 95%, the system error will reach about 5.47%.
When the catalytic-FID is used for measuring the fixed pollution source, the influence of the catalytic efficiency on the measurement of the NMHC is small when the catalytic efficiency is more than 90 percent, and most of components of the smoke discharged from the fixed pollution source are NMHC and CH4The content of (a) is extremely low.
But when used for ambient air or plant measurements, the CH in ambient air is generally4The content of (A) is about 2000ppb, the content of NMHC is within the range of 200-500 ppb, and the reduction of catalytic efficiency can lead to CH4The measured value of (2) is too high, so that the value of NMHC with low content per se is greatly reduced in proportion, and larger measurement error is caused.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a detection method of non-methane total hydrocarbons.
The purpose of the invention is realized by the following technical scheme:
the detection method of the non-methane total hydrocarbons comprises the following steps:
the organic waste gas enters a total hydrocarbon detection flow path, and the detector outputs a total hydrocarbon signal STHC；
Organic waste gas enters a methane detection flow path, non-methane molecules are converted into inorganic substances, methane is reserved, the inorganic substances cannot be detected by the detector, and the detector outputs a methane signal
The analysis unit obtains non-methane according to the total hydrocarbon signal and the methane signalTotal hydrocarbon content CNMHC；
The compensation unit is based on the total hydrocarbon content C of non-methaneNMHCTo obtain a compensation content
k is the calibration coefficient for methane and η is the conversion efficiency of non-methane molecules.
Compared with the prior art, the invention has the beneficial effects that:
the detection result is accurate;
the invention provides a compensation mode of non-methane total hydrocarbon content, which compensates the detection error caused by the fluctuation of conversion efficiency, thereby improving the detection accuracy.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
FIG. 1 is a schematic diagram of a method for detecting non-methane total hydrocarbons according to an embodiment of the invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. Some conventional aspects have been simplified or omitted for the purpose of explaining the technical solution of the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
as shown in fig. 1, the method for detecting non-methane total hydrocarbons according to the embodiment of the present invention includes:
the organic waste gas enters a total hydrocarbon detection flow path, and the detector outputs a total hydrocarbon signal STHC；
Organic waste gas enters a methane detection flow path, non-methane molecules are converted into inorganic substances, methane is reserved, the inorganic substances cannot be detected by the detector, and the detector outputs a methane signal
The analysis unit obtains the non-methane total hydrocarbon content C according to the total hydrocarbon signal and the methane signalNMHC；
The compensation unit is based on the total hydrocarbon content C of non-methaneNMHCTo obtain a compensation content
k is the calibration coefficient for methane and η is the conversion efficiency of non-methane molecules.
Example 2:
an example of the use of the method for detecting non-methane total hydrocarbons according to example 1 of the present invention in organic waste gas.
In the present application example, in the methane detection flow path, non-methane molecules were catalyzed by 0.5% Ru/. gamma. -Al2O3(ii) a The catalytic oxidation is performed to inorganic matters, and the conversion efficiency is 95-97 percent; the FID detector did not respond to the mineral.
The preparation method of the catalyst comprises the following steps:
weighing dried gamma-alumina particles, such as 10g dried gamma-alumina particles with particle size of 2-3mm, as a carrier for later use;
weighing ruthenium trichloride hydrate particles and dissolving the ruthenium trichloride hydrate particles in deionized water, wherein 0.3g of ruthenium trichloride hydrate particles are dissolved in 10mL of deionized water;
slowly and uniformly dripping a ruthenium trichloride aqueous solution onto the alumina particles, sealing, and standing at room temperature for 12 hours if standing;
after standing, drying the alumina particles, for example, drying in an oven at 110 ℃ for 2 h;
placing the dried alumina particles in a muffle furnace, and roasting at a programmed temperature, such as 550 deg.C for 4 hr to obtain non-methane total hydrocarbon catalyst (0.5% Ru/Al)2O3)。
As shown in fig. 1, the method for detecting non-methane total hydrocarbons in this example is:
the organic waste gas enters a total hydrocarbon detection flow path, and the detector outputs a total hydrocarbon signal STHC＝110pA；
The organic waste gas enters a methane detection flow path, non-methane molecules are catalyzed and oxidized into inorganic matters by a catalyst, the methane retention rate exceeds 90 percent, the inorganic matters cannot be detected by the detector, and the detector outputs a methane signal
The analysis unit obtains the non-methane total hydrocarbon content C according to the total hydrocarbon signal and the methane signalNMHCThe calculation method is the prior art in the field;
as the catalyst working time becomes longer, the conversion efficiency is obviously reduced, and the non-methane total hydrocarbon content C needs to be compensatedNMHCThe compensation unit is based on the total hydrocarbon content C other than methaneNMHCTo obtain a compensation content
k＝0.053，η＝90.05％。
Claims (4)
1. The detection method of the non-methane total hydrocarbons comprises the following steps:
the organic waste gas enters a total hydrocarbon detection flow path, and the detector outputs a total hydrocarbon signal STHC；
Organic waste gas enters a methane detection flow path, non-methane molecules are converted into inorganic substances, methane is reserved, the inorganic substances cannot be detected by the detector, and the detector outputs a methane signal
The analysis unit obtains the non-methane total hydrocarbon content C according to the total hydrocarbon signal and the methane signalNMHC；
The compensation unit is based on the total hydrocarbon content C of non-methaneNMHCTo obtain a compensation content
k is the calibration coefficient for methane and η is the conversion efficiency of non-methane molecules.
2. The method of detecting non-methane total hydrocarbons according to claim 1, wherein in the methane detection flow path, non-methane molecules are catalytically oxidized to inorganics.
3. The method for detecting non-methane total hydrocarbons according to claim 2, wherein the catalyst used in the catalytic oxidation is Ru/γ -Al2O3。
4. The method of detecting non-methane total hydrocarbons according to claim 1, wherein the detector is a FID detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111633146.6A CN114487276B (en) | 2021-12-29 | 2021-12-29 | Method for detecting non-methane total hydrocarbons |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111633146.6A CN114487276B (en) | 2021-12-29 | 2021-12-29 | Method for detecting non-methane total hydrocarbons |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114487276A true CN114487276A (en) | 2022-05-13 |
| CN114487276B CN114487276B (en) | 2024-01-12 |
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| CN202111633146.6A Active CN114487276B (en) | 2021-12-29 | 2021-12-29 | Method for detecting non-methane total hydrocarbons |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0319887A2 (en) * | 1987-12-11 | 1989-06-14 | Horiba, Ltd. | Method and apparatus for analyzing fluids by multi-fluid modulation modes |
| US5255072A (en) * | 1987-12-11 | 1993-10-19 | Horiba, Ltd. | Apparatus for analyzing fluid by multi-fluid modulation mode |
| US20020021984A1 (en) * | 1998-10-24 | 2002-02-21 | Armin Kroneisen | Device for methane-free hydrocarbon measurement |
| JP2006349639A (en) * | 2005-06-20 | 2006-12-28 | Shimadzu Corp | Differential infrared gas analysis system and its calibration method |
| CN212514441U (en) * | 2020-02-10 | 2021-02-09 | 聚光科技(杭州)股份有限公司 | On-line gas chromatograph |
-
2021
- 2021-12-29 CN CN202111633146.6A patent/CN114487276B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0319887A2 (en) * | 1987-12-11 | 1989-06-14 | Horiba, Ltd. | Method and apparatus for analyzing fluids by multi-fluid modulation modes |
| US5255072A (en) * | 1987-12-11 | 1993-10-19 | Horiba, Ltd. | Apparatus for analyzing fluid by multi-fluid modulation mode |
| US20020021984A1 (en) * | 1998-10-24 | 2002-02-21 | Armin Kroneisen | Device for methane-free hydrocarbon measurement |
| JP2006349639A (en) * | 2005-06-20 | 2006-12-28 | Shimadzu Corp | Differential infrared gas analysis system and its calibration method |
| CN212514441U (en) * | 2020-02-10 | 2021-02-09 | 聚光科技(杭州)股份有限公司 | On-line gas chromatograph |
Non-Patent Citations (1)
| Title |
|---|
| KWANGSAM NA, ET AL.: "Determination of non-methane hydrocarbon emission factors from vehicles in a Tunnel in Seoul in May 2000", KOREAN JOURNAL OF CHEMICAL ENGINEERING, vol. 19, pages 434 * |
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| CN114487276B (en) | 2024-01-12 |
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