Method for detecting coal quality using raman spectroscopy

A method for detecting coal quality of coal, the method comprising:

• (1) selecting a plurality of standard coals with different coal ranks and different ash contents, acquiring Raman spectral characteristic parameters of each standard coal and characteristic parameters of coal quality components of each standard coal, calculating a mapping relationship between the Raman spectral characteristic parameters and the characteristic parameters of coal quality components of each standard coal, to establish a relational database of the Raman spectral characteristic parameters and the characteristic parameters of the coal quality components;
• (2) providing an unknown coal to be analyzed, conducting a Raman spectroscopy on the coal to yield Raman spectrum of the coal, and performing curve-fitting calculation on the Raman spectrum of the coal to obtain Raman spectral characteristic parameters of the coal;
• and
• (3) comparing the Raman spectral characteristic parameters of the coal with the Raman spectral characteristic parameters of the relational database, and based on the mapping relationship between the Raman spectral characteristic parameters and the characteristic parameters of coal quality components obtained in 1), determining the coal quality;
• wherein:
• in (1), the Raman spectral characteristic parameters of standard coals comprise at least one of the following parameters:
• peak areas I2670, I2810, I3060, and I3180 of the wave peak 2670 cm−1, the wave peak 2810 cm−1, the wave peak 3060 cm−1, and the wave peak 3180 cm−1, respectively;
• a total peak area S1 of the first-order Raman spectra and a total peak area S2 of the second-order Raman spectra, and combined parameters thereof comprising I2670/S1, I2810/S1, I3060/S1, I2670/S2, I2810/S2, I3060/S2, I2670/I2810, I2670/I3060, I2670/I3180, I3180/I3060, I3180/I2810, I(2810+3060)/I2670, and S2/S1.