Experimental study on thermokinetic characteristics of multiple coal seams in Xinjiang open pit mine using thermogravimetric–Fourier transform infrared spectroscopy and thermogravimetric–mass spectrometry

Abstract

This study focuses on the coal spontaneous combustion in the open-pit mining of multiple coal seams in Dananhu No.2 Mine. Experimental research was conducted on the characteristics and thermokinetics of coal spontaneous combustion oxidation. A synchronous thermal analysis thermogravimetric (TG)-differential scanning calorimetry(DSC)- Fourier transform infrared spectroscopy (FTIR), thermogravimetric(TG)-mass spectrometry (MS) combined system was used to analyze the mass variation, gaseous product, functional group and other parameters of coal spontaneous combustion. The results of TG-DTG-DSC analysis indicate that different heating rates affect the characteristic temperature points and thermal weight loss process of coal spontaneous combustion. A significant change in the reaction kinetics mechanism of the coal spontaneous combustion process. The relationship between the apparent activation energy and the pre-exponential factor in coal spontaneous combustion indicates that the pre-exponential factor positively correlates with the apparent activation energy. These findings are crucial for a deeper understanding of the coal spontaneous combustion process.