Low-concentration and multi-component gas detection method based on integration of multiple spectrum technologies

A spectroscopic technology and gas detection technology, used in multi-component high-sensitivity gas detection and low-concentration fields, can solve the problems of large linear deviation, single measurement component, and high detection lower limit of the instrument, and achieve the effect of eliminating cross-interference and accurate measurement.

Active Publication Date: 2015-04-29
NANJING GUODIAN ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

[0003] A large number of engineering applications and repeated laboratory tests have shown that most of the infrared instruments currently have low concentrations of SO 2 , NO measurement accuracy is low, linear deviation is large, and the detection limit of the instrument is high, especially at low concentrations (less than 50mg/m 3 ), the interference of moisture on the measurement is obvious, and the measurement results have large deviations, which makes it more and more difficult to meet the increasingly stringent flue gas emission standards; electrochemical analysis methods have serious cross-interference and are susceptible to moisture, H

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  • Low-concentration and multi-component gas detection method based on integration of multiple spectrum technologies
  • Low-concentration and multi-component gas detection method based on integration of multiple spectrum technologies
  • Low-concentration and multi-component gas detection method based on integration of multiple spectrum technologies

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[0038] (The following combination Figure 1-Figure 4 , the present invention is described in further detail)

[0039] The specific implementation process is described below, such as Figure 4 As shown by the solid line, when the method of the present invention is not used, there is serious cross-interference in the NO absorbance:

[0040] The inventive method such as figure 1 As shown, the specific steps are as follows:

[0041] Step 1: Record the Background Spectrum

[0042] Introduce N into the gas cell 2 Or in the case of air, use a spectrometer to extract the ultraviolet absorption background spectral data I 0, using photodiodes and lock-in amplifiers to extract infrared absorption background spectral data X 0 , which is the second harmonic background signal.

[0043] Step 2: Use multi-detectors to extract ultraviolet absorption spectrum signals and infrared absorption spectrum signals respectively

[0044] When the flue gas to be measured is passed into the gas ce...

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Abstract

The invention discloses a low-concentration, multi-component and high-sensitivity gas detection method based on integration of multiple spectrum technologies. Advantages of an ultraviolet differential optical absorption spectroscopy (DOAS) technology and an infrared tunable diode laser absorption spectroscopy (IR-TDLAS) technology are integrated, so that information integration and characteristic signal extraction of two kinds of spectrum are realized. The method disclosed by the invention is used for measuring the NH3 concentration in smoke by utilizing a TDLAS method and simultaneously measuring the concentrations of SO2 and NO2 in smoke by utilizing an ultraviolet DOAS method; interference of three components in the NO absorbancy is removed according to the obtained concentrations and an interference spectrum of three kinds of gas to the NO absorbancy, so that the NO concentration without cross interference is solved; and thus, the measurement precision and the detection lower limit are greatly increased.

Description

technical field [0001] The invention relates to a low-concentration, multi-component and high-sensitivity gas detection technology based on the fusion of multiple spectral technologies, which belongs to the technical field of spectral measurement. Background technique [0002] Currently used in industrial pollution source flue gas emissions and SO in the production process 2 , NO, NO 2 Concentration online monitoring technology can be mainly divided into non-dispersive infrared absorption method, electrochemical method and differential absorption spectroscopy (DOAS, Differential Optical Absorption Spectroscopy) according to its principle. [0003] A large number of engineering applications and repeated laboratory tests have shown that most of the infrared instruments currently have low concentrations of SO 2 , NO measurement accuracy is low, linear deviation is large, and the detection limit of the instrument is high, especially at low concentrations (less than 50mg / m 3 )...

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Application Information

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IPC IPC(8): G01N21/39G01N21/33
Inventor 汤光华韩少鹏苗丰彭樟杨剑李忠文李利孔红兵林正根丁广华刘璐季本慧
Owner NANJING GUODIAN ENVIRONMENTAL PROTECTION TECH
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