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Method for detecting non-methane hydrocarbon
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A non-methane total hydrocarbon and detection method technology, which is applied in the field of organic waste gas detection, can solve the problems of high measurement value and measurement error, and achieve the effects of compensating detection error, accurate detection result and improving detection accuracy
Pending Publication Date: 2022-05-13
FOCUSED PHOTONICS
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[0004] However, when it is used for ambient air or factory boundary measurement, in general, CH in the ambient air 4 The content of NMHC is about 2000ppb, and the content of NMHC is in the range of 200-500ppb. The decrease of catalytic efficiency will make CH 4 The measured value is too high, so that the value of NMHC, which is not high in itself, is greatly reduced in proportion, resulting in a large measurement error
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Embodiment 1
[0019] The detection method of the non-methane total hydrocarbon of the embodiment of the present invention, such as figure 1 Shown, the detection method of described non-methane total hydrocarbons is:
[0020] The organic waste gas enters the total hydrocarbon detection flow path, and the detector outputs the total hydrocarbon signal S THC ;
[0021] Organic waste gas enters the methane detection flow path, non-methane molecules are converted into inorganic substances, methane remains, the inorganic substances cannot be detected by the detector, and the detector outputs a methane signal
[0022] The analysis unit obtains the non-methane total hydrocarbon content C according to the total hydrocarbon signal and the methane signal NMHC ;
[0023] The compensation unit is based on the total non-methane hydrocarbon content C NMHC get compensation content k is the calibration factor for methane, and η is the conversion efficiency for non-methane molecules.
Embodiment 2
[0025] An application example of the non-methane total hydrocarbon detection method according to Example 1 of the present invention in organic waste gas.
[0026] In this application example, in the methane detection flow path, non-methane molecules are catalyzed by 0.5% Ru / γ-Al 2 o 3 ; Catalytic oxidation into inorganic substances, the conversion efficiency is 95%-97%; FID detector has no response to the inorganic substances.
[0027] The preparation method of catalyst is as follows:
[0028] Weigh the dried gamma-alumina particles, such as 10 g of dried gamma-alumina particles with a particle size of 2-3 mm, as a carrier for subsequent use;
[0029] Weigh the ruthenium trichloride hydrate particles and dissolve them in deionized water, for example, dissolve 0.3g of ruthenium trichloride hydrate particles in 10mL of deionized water;
[0030] Slowly and evenly drop an aqueous ruthenium trichloride solution onto the alumina particles, seal it, and let it stand at room temper...
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Abstract
The invention provides a non-methane total hydrocarbon detection method which comprises the following steps: organic waste gas enters a total hydrocarbon detection flow path, and a detector outputs a total hydrocarbonsignal STHC; the organic waste gas enters a methane detection flow path, non-methane molecules are converted into inorganic matters, methane is reserved, the inorganic matters cannot be detected by the detector, and a detector output methane signal analysis unit obtains non-methane total hydrocarbon content CNMHC according to a total hydrocarbon signal and a methane signal; the compensation unit obtains the compensation content k according to the non-methane total hydrocarbon content CNMHC, the compensation content k is the calibration coefficient of methane, and eta is the conversion efficiency of non-methane molecules. The method has the advantages of accurate detection result and the like.
Description
technical field [0001] The invention relates to the detection of organic waste gas, in particular to a detection method of non-methane total hydrocarbons. Background technique [0002] According to GB37822-2019 and HJT55-2000, fugitive emission control standards for volatile organic compounds at the factory boundary, the fugitive NMHC emission limit is 4mg / m 3 . Using NMHC: CH 4 If the instrument calibrated with a standard gas of 1:10 is used to measure the gas with the critical value of the emission limit, the system error is 1.15% (calculated, theoretically, every 1% decrease in the catalytic efficiency will cause 1.0% to 1.1% to the final NMHC monitoring data. % error). But if the catalytic efficiency drops to 95%, the systematic error will reach about 5.47%. [0003] When the catalytic-FID is used for the measurement of fixed pollution sources, when the catalytic efficiency is above 90%, it has little effect on the measurement of NMHC, because most of the components ...
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