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An instrument and method for measuring carbon dioxide concentration in flue gas

A technology of carbon dioxide and concentration, applied in the field of measuring instruments, can solve the problems of limitations, multiple calibrations and large-scale use, and high cost of gas chromatographs

Active Publication Date: 2019-11-26
NAT INST OF METROLOGY CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Currently domestic measurement of CO from stationary sources 2 Gas chromatography is used for concentration, but its wide-scale use is limited due to the high cost of gas chromatograph, the complexity of the system, and the need for multiple calibrations.

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  • An instrument and method for measuring carbon dioxide concentration in flue gas
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  • An instrument and method for measuring carbon dioxide concentration in flue gas

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Embodiment Construction

[0024] In order to facilitate the understanding of the present invention, the embodiments of the present invention will be described below in conjunction with the accompanying drawings. Those skilled in the art should understand that the following description is only for the convenience of explaining the present invention, not as a specific limitation on its scope.

[0025] When a laser beam with frequency v passes through the measured gas with length L, the energy attenuation of the laser can be characterized by the Beer-Lambert law:

[0026]

[0027] In the formula: I o (v) is the light energy before the laser passes through the gas, I(v) is the light energy after the laser passes through the gas, v is the laser frequency, and a(v) is the absorption coefficient.

[0028] The absorption coefficient a(v) can be expressed as:

[0029] α(v)=n i σ i (v) (2)

[0030] where: n i is the particle number density of the substance to be measured, σ i (v) is the absorption cross...

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Abstract

The invention relates to an apparatus for measuring the concentration of carbon dioxide in flue gas. The apparatus comprises a laser outputting a laser beam for detection, a function generator connected to the laser for modulating a current of the laser, and an optical cavity in which gas to be tested is located, wherein the laser beam is reflected for multiple times in the optical cavity, then isemitted from the optical cavity and enters a photodetector. The invention also discloses a measuring method with the instrument. The measuring instrument and method have the advantages of wide operating wavelength, simple structure, clear measuring principle and high signal-to-noise ratio, and have wide application prospects in the field of atmospheric pollution gas detection.

Description

technical field [0001] The invention relates to a measuring instrument and a method, in particular to an instrument and a method for measuring the carbon dioxide concentration in flue gas. Background technique [0002] With the development of the economy and the improvement of the level of industrialization, the concentration of greenhouse gases has been exacerbated by human activities such as fossil fuel combustion emissions and deforestation, making global warming one of the greatest challenges facing mankind today. Greenhouse gases in the atmosphere include carbon dioxide (CO 2 ), methane (CH 4 ), nitrous oxide (N 2 O) etc. Among them, carbon dioxide is the gas that has the greatest impact on the greenhouse effect. According to the fifth assessment report of the United Nations Intergovernmental Panel on Climate Change (IPCC), in 2011 atmospheric CO 2 The content has risen by 40% compared to 1750. [0003] Greenhouse gas emission sources are mainly divided into distr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/39
CPCG01N21/39G01N2021/399
Inventor 林鸿张亮张金涛冯晓娟
Owner NAT INST OF METROLOGY CHINA