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Self-adaptive differential absorption spectrum measuring method of concentration of flue gas pollutants and device

A technology of pollutant concentration and adaptive difference, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of long response time, easy to block, and unrepresentative point measurement

Active Publication Date: 2011-02-09
SOUTHEAST UNIV
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Problems solved by technology

[0004] In order to solve the problems of easy blockage, long response time, and unrepresentative point measurement in the flue gas sampling measurement method, as well as the influence of high dust concentration in the flue gas on the traditional differential absorption spectrum flue gas pollutant concentration measurement, the present invention provides a Method and device for online measurement of flue gas pollutant emission concentration by adaptive differential absorption spectroscopy

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  • Self-adaptive differential absorption spectrum measuring method of concentration of flue gas pollutants and device
  • Self-adaptive differential absorption spectrum measuring method of concentration of flue gas pollutants and device
  • Self-adaptive differential absorption spectrum measuring method of concentration of flue gas pollutants and device

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Embodiment Construction

[0046] The present invention uses empirical mode decomposition EMD to perform relevant processing on the absorption spectra of gaseous pollutants of fixed pollution sources, thereby eliminating the spectral interference caused by soot scattering and absorption and filtering out the slow-changing trend items, thereby obtaining accurate gaseous pollutants (SO2 , NOx) emission concentration value. The specific implementation steps of the measurement method are as follows: figure 1 As shown, the flue gas passes through the flue 3 space, and a parallel beam is injected perpendicular to the flow direction of the flue gas (obtained by the pulsed xenon lamp or deuterium lamp light source 1 through the collimating lens 2), and the incident spectral intensity is I 0 (λ), after passing through the flue, due to the absorption of pollutants, the spectral intensity becomes I(λ), which is collected by the lens 4 and collected and processed by the spectroscopic device 5.

[0047] 1. Use a fiber ...

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Abstract

The invention discloses a self-adaptive differential absorption spectrum measuring method of concentration of flue gas pollutants and a device. The method comprises the following steps: using empirical mode decomposition (EMD) to combine a 3 sigma criterion to determine decomposition scale and threshold value of gaseous pollutants absorbance, fully remaining own non-stationary characteristics of differential absorbance, effectively reducing background spectrum interference caused by dusts, establishing equation sets about concentration C1, C2 until Cn of gaseous pollutants to n types of pollutant gases (SO2, NOx) to be measured according to the differential absorbance after reducing noise and eliminating trend terms, and adopting a linear least square algorithm to obtain the concentrationof the gaseous pollutants to be measured. The self-adaptive differential absorption spectrum measuring device of concentration of flue gas pollutants comprises a light source, an optical fiber coupler, an optical fiber spectrometer, a computer and an optical system consisting of a collimating lens, a beam splitter, a reference beam lens, a reflecting lens, a converging lens, a light baffle, an optical fiber coupler, a cross reticle, a sighting eyepiece, a lassenite window and an angle reflecting lens.

Description

Technical field [0001] The invention relates to the field of environmental protection, in particular to a method and device for on-line measurement of combustion pollutant (SO2, NOx) emission concentration by adaptive filtering differential absorption spectroscopy. Background technique [0002] my country is the world's only coal-based energy country. According to statistics, more than 60% of nitrogen oxides (NOx) and more than 80% of SO2 in the atmosphere in my country come from the flue gas emissions of various coal-fired boilers, chemical plants, metallurgical plants, cement kilns and other fixed pollution sources. Therefore, realizing the online automatic monitoring of the concentration of flue gas emissions from pollution sources is of great significance to the prevention and control of combustion air pollution. At present, the concentration of gaseous pollutants (SO2, NOx) in fixed pollution sources is mainly measured by direct sampling or dilution sampling combined with t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 许传龙姚其兵汤光华宋飞虎王式民
Owner SOUTHEAST UNIV
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