Pulverized coal classification method based on laser induced breakdown spectroscopy

Abstract

The invention discloses a pulverized coal classification method based on a laser induced breakdown spectroscopy. The method comprises: preparing a sheet sample based on a pulverized coal sample; acquiring a laser induced breakdown spectroscopy, including characteristic spectral lines of a main element, an ash element, and a trace element of the sheet sample, of the sheet sample; on the basis of aprincipal component analysis algorithm, extracting peak intensity characteristic variables of the characteristic spectral lines; and according to the peak intensity characteristic variables, classifying the pulverized coal sample based on a K nearest neighbor classification algorithm. Therefore, the pulverized coal can be classified rapidly and accurately; and thus the industrial coal burning parameters can be adjusted timely and the coal burning efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of laser spectrum analysis, in particular to a pulverized coal classification method based on laser-induced breakdown spectrum. Background technique [0002] Laser Induced Breakdown Spectroscopy (LIBS) is essentially an atomic emission spectroscopy technique, which was first developed in the 1960s. This technology uses a high-energy pulsed laser to act on the surface of the sample to ablate the sample and excite it to generate plasma. During the quenching process, the plasma generates bremsstrahlung and simultaneously emits the characteristic spectral lines of the sample. By analyzing the wavelength and intensity of the characteristic spectral lines , to achieve qualitative and quantitative analysis of samples. Compared with other traditional analysis techniques, LIBS technology has many obvious advantages, such as simple and flexible equipment, no or only simple sample pretreatment, multi-element simultane...

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Problems solved by technology

However, the existing coal classification method is relatively complicated to operate and consumes a lot of time, which is not conducive to timely adjustment of industrial coal combustion parameters and improvement of coal combustion efficiency.

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