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

A pollutant concentration, self-adaptive differential technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of easy blockage, unrepresentative point measurement, and long response time.

Active Publication Date: 2010-04-14
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

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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 utilizes empirical mode decomposition (EMD) to correlate the absorption spectrum of gaseous pollutants from fixed pollution sources, thereby eliminating spectral interference generated by soot scattering and absorption and filtering out slowly changing trend items, thereby obtaining accurate gaseous pollutants (SO2 , NOx) emission concentration value. The specific implementation steps of this measurement method are:

[0047] Such as figure 1 As shown, the flue gas passes through the flue 3 space, and is perpendicular to the flow direction of the flue gas and injects a parallel light beam (obtained by the pulse xenon lamp or the deuterium lamp light source 1 through the collimating lens 2), and the incident spectral intensity is 1 0 (λ), after passing through the flue, due to the absorption of pollutants, the spectral intensity becomes I(λ), and after being converged by the lens 4, it is collected and processed by the spectral device 5.

[0048] 1...

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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 concentration of 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 an adaptive filter differential absorption spectrum online measurement method and device for the emission concentration of combustion pollutants (SO2, NOx). Background technique [0002] my country is the only major energy country in the world that relies mainly on coal. According to statistics, more than 60% of nitrogen oxides (NOx) and more than 80% of SO2 in my country's atmosphere come from flue gas emissions from fixed pollution sources such as various coal-fired boilers, chemical plants, metallurgical plants, and cement kilns. Therefore, it is of great significance to realize the online automatic monitoring of the concentration of flue gas emission from pollution sources for the prevention and control of combustion air pollution. At present, the concentration of gaseous pollutants (SO2, NOx) in stationary pollution sources is mainly measured by direct sampling or di...

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Application Information

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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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