Laser-Induced Breakdown Spectroscopy for Determination of the Organic Oxygen Content in Anthracite Coal under Atmospheric Conditions

Abstract

Laser-induced breakdown spectroscopy has been used to measure the organic oxygen content in pulverized anthracite coal under atmospheric conditions. Special spectral processing including the optimal O(I) emission-line selection by comparing the spectral correlation coefficients with the N(I) line, internal normalization with the N(I) line, and temperature correction are proposed and employed to satisfy the multi-line analysis method and yield the most accurate quantitative results. The calibration method for determining the organic oxygen content of coal is presented, with an accuracy of 1.15-1.37% and an average relative error of 19.39% being evaluated through an experiment performed on six anthracite coal samples. The relative measurement error distribution has also been studied.

A model combining spectrum standardization and dominant factor based partial least square method for carbon analysis in coal using laser-induced breakdown spectroscopy

“…The laser-induced breakdown spectroscopy (LIBS) is a very promising technology for on-line coal analysis, for its advantages include rapid and in situ analysis, no or minimal sample preparation, simultaneous multi-element measurement, and so on [5][6][7]. Although a number of studies on coal analysis by LIBS have been performed [8][9][10][11][12], there are very few reported researches about the quantitative determination of non-metallic elements (e.g., C, H, O, and N) in coal [10][11][12]. The measurement precision and accuracy of these elements are not satisfying due to multiple factors, such as matrix effects, variations in experimental condition, and the complex physical and chemical processes of the laser-induced plasma from its generation to its expansion into the ambient gas [13][14][15][16].…”

Time-resolved LIBS of atomic and molecular carbon from coal in air, argon and helium

“…15 Zhang et al measured the organic oxygen content in pulverized anthracite coal under atmospheric conditions with LIBS, with an average relative error in 35 quantitative measurement of 19.39%. 16 Ctvrtnickova et al utilized LIBS and Thermo-Mechanical Analysis (TMA) to determine the coal elemental composition (C, H, Si, Al, Fe, Ti, Ca, Mg, Na, K, Mn, Sr and Ba) and predict slag propensity for five coal blends. 17 Feng et al utilized LIBS combined with PLS 40 to analyze carbon content in coal.…”

Suitability of laser-induced breakdown spectroscopy in screening potential additives to mitigate fouling deposits

“…Quantifying sulfur content had been a challenging task [20]; however, the problem was solved by Zhang et al [14] by employing laser energy [160 mJ/pulse. Coal calorific value can also be determined by quantifying C, H 2 , N 2 , and O 2 by LIBS [21,22]. Apart from the major elements carbon and silicon, Haider et al [23] detected the presence of trace element, ytterbium, in Bangladesh coals.…”