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The combustion characteristics of Yangquan (YQ) and Yungang (YG) coal samples before and after exposure to microwave radiation were studied using the non-isothermal thermogravimetric method, and the combustion rules of pulverized coal before and after microwave exposure to radiation were investigated. The results show that after microwave modification the ignition temperature ( Ti ), burnout temperature ( Tj ) and the temperature of maximum combustion rate ( Tk ) of coal sample were all reduced about 10-20°C and the burnout time was shortened by 1–2 min, indicating that the provided treatment effectively improved the combustion performance of the pulverized coal. The characteristic indices  C  and  S  of the modified coal samples increased at a high heating rate (20°C/min), which suggests that the microwave modification has a stronger effect on the combustion performance of coal samples at high heating rates. As per the FT-IR spectrum curve, the absorption peak intensity of the higher activity group in the coal sample increased significantly after microwave modification. A comprehensive VR model was employed to model the kinetics of the coal combustion process. The resultant model had a correlation coefficient ( R2 ) of above 0.999 and root means square error ( RMSE ) of less than 0.018%, which indicating that the combustion behavior of the pulverized coal can be well described using the VR model. The activation energies  E1  and  E2  of M-YQ and M-YG modified via microwave treatment were decreased by 3.12 kJ·mol −1 , 1.02 kJ·mol −1 , 4.55 kJ·mol −1 , and 8.14 kJ·mol −1  respectively, which further demonstrates that the microwave radiation can effectively accelerate reaction rate of the coal combustion per unit time.

Kinetics of microwave radiation pulverized coal combustion based on non-isothermal thermogravimetric analysis