Journal
APPLIED SPECTROSCOPY
Volume 68, Issue 6, Pages 672-679Publisher
SAGE PUBLICATIONS INC
DOI: 10.1366/13-07278
Keywords
Coal particles; LIBS; Spectral identification; Representative spectra; Partial breakdown spectra
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Funding
- National Natural Science Foundation of China [51206055]
- Foundation of State Key Laboratory of Coal Combustion [FSKLCC1106]
- Fundamental Research Funds for the Central Universities [2012ZM0014]
- Research Foundation of Education Bureau of Guangdong Province [2012LYM_0018]
- Natural Science Foundation of Guangdong Province [S2012040007220]
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Laser-induced breakdown spectroscopy (LIBS) was employed to directly analyze coal particles in the form of descending flow. Coal-particle ablation was performed using a 1064 nm neodymium-doped yttrium aluminum garnet (Nd : YAG) laser at atmospheric conditions. Spectral identification schemes were used to acquire spectra containing all the emission lines of the important elements in coal. These acquired spectra were classified as representative spectra. The background of the line emission plus three times the standard deviation of the background of the representative spectra was chosen as the threshold value. A method using a single line and a method using combined multiple lines (C, 247.8 nm; N, 746.8 nm; Si, 288.2 nm; and Ca, 396.8 nm) were compared to obtain the best results for the spectral identification of coal particle flow. The feasibility of rejecting the partial breakdown spectra was verified using quantitative analysis of fixed carbon in coal.
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