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System and method for measuring mercury content of flue gas on line based on LIBS technology

A flue gas and measuring cavity technology, which is used in measuring devices, instruments, material analysis by optical means, etc., to achieve the effects of simple operation, high measurement repeatability, and low element detection limit

Pending Publication Date: 2020-12-25
XI AN JIAOTONG UNIV
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Problems solved by technology

Both of the above two methods require the sample preparation process of chemical manipulation of the flue gas to be tested, so the fastest response time still needs at least 90 seconds

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  • System and method for measuring mercury content of flue gas on line based on LIBS technology
  • System and method for measuring mercury content of flue gas on line based on LIBS technology
  • System and method for measuring mercury content of flue gas on line based on LIBS technology

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Embodiment Construction

[0053] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] The inventive idea of ​​the embodiment of the present invention is: measure the spectral line intensity value of the mercury element and the spectral line intensity value of the carbon element in the standard mercury vapor by LIBS technology, use the spectral line intensity value of the mercury element and the spectral line intensity value of the carbon element value as input, and the concentration of mercury element in the standard mercury vapor as output, the internal standard model is linearly fitted to obtain the quantitative model of the internal standard method; the spectrum of mercury element corresponding to the diluted flue gas after dilution is measured by LIBS technology The line intensity value and the spectral l...

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Abstract

Embodiments of the invention provide a system and method for measuring the mercury content of flue gas on line based on an LIBS technology. The system executes the following steps of firstly, measuring spectral line intensity values of mercury and carbon in standard mercury vapor so as to obtain an internal standard method quantification model through the mercury concentration in the standard mercury vapor and an internal standard model; then measuring spectral line intensity values of the mercury and the carbon in diluted to-be-measured flue gas; and finally, substituting the spectral line intensity values of the mercury and the carbon into the internal standard method quantification model to obtain a concentration value of the mercury in the to-be-measured flue gas. According to the system and the method, the content of the mercury in the to-be-detected flue gas can be rapidly detected in a non-contact manner, the repeatability is high, the measurement process is safe and reliable, the element detection limit is low, and remote online monitoring can be carried out.

Description

technical field [0001] The invention relates to the field of laser measurement and diagnosis, in particular to a system and method for online measurement of flue gas mercury content based on LIBS technology. Background technique [0002] The principle of Laser-Induced Breakdown Spectroscopy (LIBS) is to focus the pulsed laser on the surface of the sample, high-temperature plasma is generated on the surface of the sample, and the plasma emits elemental lines during the cooling process, emitting The spectral lines correspond to the elements in the measured sample one by one, and the elements and their concentrations in the sample to be tested are obtained according to the wavelength and intensity of the emission spectral lines. In recent years, LIBS technology has been widely used in various industrial production fields, such as environmental monitoring, metallurgical , coal quality detection, biomedicine, archaeology, art and other fields. [0003] The flue gas produced by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71G01N21/01
CPCG01N21/718G01N21/01G01N2021/0112
Inventor 王珍珍周王峥荣凯胡若木刘人玮种道彤
Owner XI AN JIAOTONG UNIV
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