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Flue gas analysis and measurement method implemented through ultraviolet spectrum

A flue gas analysis and measurement method technology, which is applied in the field of ultraviolet spectrum flue gas analysis and measurement, can solve the problems of low absorption line intensity, unfavorable measurement, high cost of tunable laser, etc., and achieve the effect of ensuring accuracy and stability

Inactive Publication Date: 2016-05-04
SINOGREEN ENVIRONMENTAL PROTECTION SCI & TECH
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Problems solved by technology

The disadvantage is that the cost of tunable lasers in the mid-infrared region is too high, different gas detection needs to be equipped with different light sources, and the intensity of absorption lines produced by lasers in the near-infrared region is low, which is not conducive to measurement

Method used

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Embodiment 1

[0017] The method for measuring flue gas by ultraviolet spectrum is characterized in that: comprising a gas chamber and a spectrometer, the operation is carried out according to the following steps,

[0018] a. Introduce the gas to be measured with the concentration X into the gas chamber with the optical path L;

[0019] B, utilize the spectrometer to measure and obtain Ii (λ), Ii (λ) represents the light intensity of the gas to be measured that the i-th gas passes through the gas whose concentration is X and the optical path is L;

[0020] c. I0(λ) is obtained through experimental measurement, and I0(λ) represents the incident light intensity at the wavelength of λ;

[0021] d. According to the calculation principle of the absorption cross-section, it is the Beer-Lambert law, and σi(λ) is calculated. The formula is Ii(λ)=I0(λ)exp{-L*σi(λ)*X},

[0022] Among them, I0(λ) represents the incident light intensity at the wavelength of λ, Ii(λ) represents the light intensity of th...

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Abstract

The invention relates to a flue gas analysis and measurement method implemented through an ultraviolet spectrum and belongs to the technical field of flue gas detection. The flue gas analysis and measurement method through the ultraviolet spectrum includes the steps that, the part with light intensity slowly changing with wave length is eliminated in an absorption spectrum, only the part with light intensity rapidly changing with the wave length is left, and then the part with light intensity rapidly changing with the wave length is utilized to conduct inversion on the concentration of gas, so that measured value fluctuation and drifting caused by light source temperature drift or attenuation, dust interference, interference of other gas and other factors are avoided, according to the adopted technical scheme, a differential optical absorption spectroscopy (DOAS) is utilized, in other words, the part with light intensity slowly changing with wave length is eliminated in the absorption spectrum, only the part with light intensity rapidly changing with the wave length is left, and then the part with light intensity rapidly changing with the wave length is utilized to conduct inversion on the concentration of gas. The flue gas analysis and measurement method is widely applied to analysis and measurement of flue gas.

Description

technical field [0001] The invention relates to an ultraviolet spectrum flue gas analysis and measurement method, which belongs to the technical field of flue gas detection. Background technique [0002] At present, the existing gas analyzers on the market mainly use the ultraviolet fluorescence method and the tunable laser method. The ultraviolet fluorescence method can be used to measure sulfur dioxide. The energy of light, the molecule fluoresces when it is excited to return to the ground state from a high energy level. N2 and O2 in the atmosphere basically do not cause the "fluorescence quenching effect". The SO2 in the excited state mainly returns to the ground state through the fluorescence process, and the photomultiplier tube is used to receive the emitted fluorescence. The size can reflect the concentration of sulfur dioxide. This method can monitor low concentration SO2 on the order of ppb, and has good dynamic range and linearity, so it is mostly used for air en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 白惠峰闫兴钰张利军唐艳平郭荣吕子啸白慧宾王红梅
Owner SINOGREEN ENVIRONMENTAL PROTECTION SCI & TECH
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