Spectral standardization-based coal quality on-line detection method

A detection method and spectral technology, which is applied in the field of coal quality detection, can solve problems such as insufficient precision, inability to realize full element analysis, and large investment, and achieve the effects of improving measurement accuracy, eliminating fluctuations in experimental parameters, and simplifying analysis

Active Publication Date: 2011-01-19
TSINGHUA UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a coal quality detection method based on spectral standardization, which can be used in laser-induced plasma spectroscopy systems, in view of the disadvant

Method used

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  • Spectral standardization-based coal quality on-line detection method
  • Spectral standardization-based coal quality on-line detection method
  • Spectral standardization-based coal quality on-line detection method

Examples

Experimental program
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Embodiment

[0039] 1) Take six kinds of anthracite coal samples with known mass concentrations of each element as a group of calibration coal samples, and the mass concentrations of element nitrogen N in this group of coal samples are 0.24%, 0.29%, 0.51%, 0.85%, 1.10% respectively %, 1.14%. Load the calibration coal sample into the measuring device;

[0040] 2) Establish a calibration curve using the laser-induced plasma spectroscopy system installed on the coal conveyor belt: take the pulsed laser 1 as the excitation light source, and place the calibration coal sample 3 with known mass concentrations of each element in a protective atmosphere of air (also can be placed in N 2 , CO 2 or an atmosphere of an inert gas), the laser emitted from the laser is focused by the focusing lens 2 and acts on the surface of the calibration coal sample, generating plasma at the focal point, and collecting the plasma radiation optical signal in real time through the collecting lens 4, and the signal pa...

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Abstract

The invention relates to a spectral standardization-based coal quality on-line detection method, which can be used for coal quality on-line detection based on a laser induced plasma spectra principle. In the method, a calibrating model is established by using the intensity of an atomic characteristic spectral line after spectral standardization as a vertical coordinate and using the concentration of an element corresponding to the atomic characteristic spectral line as a horizontal coordinate. When the coal with unknown components is detected, the concentration of an element to be tested can be obtained according to the calibrating model after the spectral standardization. In the method, plasma temperature, electronic density, density ratio of ion to atom of the same element and a boltzmann's law are taken into consideration, so that the fluctuation of experiment parameters is compensated and the measuring precision is improved. The method can also be applied to the similar occasions requiring on-line real-time detection of chemical components.

Description

technical field [0001] The invention relates to a coal quality detection method. Specifically, the basic principle of the method is laser-induced plasma spectroscopy (LIBS), and a spectral standardization method is used for online rapid quantitative analysis of coal quality. Background technique [0002] In coal-consuming units, in order to regulate the production process in a timely manner, it is necessary to control the specific composition of the coal on the belt conveyor in time, so that the relevant production parameters can be adjusted in time according to the change of the coal composition. For example, in coal-fired power plants, coal costs account for 80% of the total cost, so it is crucial to understand and study the impact of coal quality and other factors on coal-consuming units. This requires real-time online analysis of the coal on the conveyor belt. However, the off-line analysis commonly used at present has the disadvantages of slow analysis speed and cumbe...

Claims

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Application Information

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IPC IPC(8): G01N21/71
Inventor 王哲李政李立志
Owner TSINGHUA UNIV
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