Gas concentration quantitative analyzer

A gas concentration and analyzer technology, which is applied in the analysis of materials, material analysis by optical means, instruments, etc., can solve the problems of inability to correct dust, pollution interference of optical windows, and inappropriate real-time processing.

Inactive Publication Date: 2008-07-23
ZHEJIANG UNIV
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Problems solved by technology

The online measurement of process gas concentration is an important means of process control. The traditional infrared spectrum online gas analyzer has many shortcomings: it must be pretreated, the speed is slow, and it cannot be measured in real time; it is cross-interferenced by background gas; it cannot be corrected Dust, optical window pollution interference; many moving parts, frequent maintenance, etc.
Theoretically speaking, the biggest disadvantage of Wiener filtering is that infinite past data must be used, which is not suitable for real-time processing

Method used

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Embodiment

[0065] The gas to be measured is methane, the optical path of the laser in the gas chamber is L=1000cm, the temperature in the gas chamber is T=296K, and the partial pressure of the gas to be measured in the gas chamber is P=1.3×10 -6 atm, the selected absorption peak center frequency (absorption line position) v 0 =6046.19527cm -1 .

[0066] The laser beam with a continuously changing frequency generated by a tunable diode laser is used to scan the absorption peak of a specific gas. The laser beam enters the central processing unit after passing through the gas to be measured to obtain the corresponding transmittance relationship of each frequency of the laser beam, and the corresponding light is given. Intensity spectral data of the wavelengths are sent to the computer. After the computer obtains the spectral data, the gas concentration analysis software analyzes and processes the measurement data.

[0067] (1) At the current temperature, the line intensity S(T) of the sp...

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Abstract

The invention discloses a gas density quantitative analyzer based on tunable diode laser absorption spectrum technique and state space theory, wherein the hardware portion is composed of an emitter, a receive system and a central processor or the like, the software portion uses Kalman filtering algorithm based on state space. The invention uses a laser beam with continuous frequency change generated by a tunable laser to scan the absorption peak of special gas, feeds the laser beam after the tested gas into a light-sensitive detector which obtains a refractive index relationship relative the laser beam of each frequency and gives strength spectrum data at relative wavelength to be sent to the central processor, uses the gas density analysis software in the central processor to model the spectrum data into a measurement equation and build a gas density state equation while sets density distribution stable along time, uses Kalman filtering algorithm to process and processes gas density robust inversion.

Description

technical field [0001] The invention relates to a gas concentration quantitative analysis device, in particular to a gas concentration quantitative analyzer based on tunable diode laser absorption spectrum technology and state space theory. Background technique [0002] With the rapid development of iron and steel metallurgy, petrochemical, cement, power generation and other industries, the control of the process is becoming more and more important. On-line measurement of process gas concentration is an important means of process control. Traditional infrared spectrum online gas analyzers have many shortcomings: pretreatment is necessary, the speed is slow, and real-time measurement cannot be performed; cross-interference by background gas; cannot be corrected Dust, optical window pollution interference; many moving parts, need frequent maintenance, etc. These disadvantages make it impossible for traditional spectroscopic gas analyzers to perform real-time and continuous me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/61G01N21/39
CPCG01N21/39G01N2021/399
Inventor 刘华锋
Owner ZHEJIANG UNIV
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