4. Conclusions
In summary, THz technique was employed in this research to determine nine coal materials. PCA was used with the input of absorbance spectra over the whole range and PC1 scores were extracted to represent the general absorption effect in the selected range. The significant parameters to evaluate coal quality, including volatile matter and ash, indicated different trend with the increase of PC1. The PC1 dependent volatile matter revealed that anthracite and bituminous coals have clear demarcation point equaling zero of PC1 score. Moreover, 15%, which is a mark to differentiate clean and
meagre coals in China, acted as extremal point reflected in THz spectra. In addition, elemental determination was also realized by
building a series of linear and non-linear models between
elemental contents and PC1 scores. These results will be significant
for parameters’ monitoring and elemental control in coal fields.
According to this research, THz technique, combined with PCA
method, should be considered as a supplementary technology for
qualitative and quantitative characterization, especially on-line
determination of key parameters of coal in coal industry.
Acknowledgments
We acknowledge the National Key Basic Research Program of
China (Grant 2014CB744302), the Specially Founded Program on
National Key Scientific Instruments and Equipment Development
(Grant 2012YQ140005) and the National Natural Science Foundation
of China (Grant No. 11574401) for the financial support of this work.
4. ConclusionsIn summary, THz technique was employed in this research to determine nine coal materials. PCA was used with the input of absorbance spectra over the whole range and PC1 scores were extracted to represent the general absorption effect in the selected range. The significant parameters to evaluate coal quality, including volatile matter and ash, indicated different trend with the increase of PC1. The PC1 dependent volatile matter revealed that anthracite and bituminous coals have clear demarcation point equaling zero of PC1 score. Moreover, 15%, which is a mark to differentiate clean andmeagre coals in China, acted as extremal point reflected in THz spectra. In addition, elemental determination was also realized bybuilding a series of linear and non-linear models betweenelemental contents and PC1 scores. These results will be significantfor parameters’ monitoring and elemental control in coal fields.According to this research, THz technique, combined with PCAmethod, should be considered as a supplementary technology forqualitative and quantitative characterization, especially on-linedetermination of key parameters of coal in coal industry.AcknowledgmentsWe acknowledge the National Key Basic Research Program ofChina (Grant 2014CB744302), the Specially Founded Program onNational Key Scientific Instruments and Equipment Development(Grant 2012YQ140005) and the National Natural Science Foundationof China (Grant No. 11574401) for the financial support of this work.
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