Study on the influence of magmatic intrusion on coal spontaneous combustion and kinetics characteristics

Abstract

In order to explore the influence of magmatic intrusion on coal spontaneous combustion characteristics in deep mines, the micro functional groups and spontaneous combustion process changes of magmatic intrusion coal and raw coal were compared and studied by infrared spectrum experiment and thermogravimetric experiment, and the kinetic parameters of the two at different oxidation stages were calculated. The results show that the aromatic hydrocarbon compounds, associated hydrogen bonds and - OH (free) in magmatic intrusive coal show a decreasing trend, while the contents of - OH, - C-O-C -, - C = O and - COOH groups in aliphatic hydrocarbon compounds and oxygen-containing functional groups increase in varying degrees. The spontaneous combustion process of raw coal and magmatic intrusive coal can be divided into three stages: water evaporation, oxygen absorption and weight gain and decomposition combustion. Compared with raw coal, the mass peak temperature and ignition point temperature of magmatic intrusive coal decrease, while the dry cracking temperature, weight loss rate peak temperature and burnout temperature increase. In addition, the activation energy of magmatic intrusive coal in the stage of water evaporation and decomposition combustion is less than that of raw coal, indicating that the magmatic intrusive coal is more likely to react with oxygen in this stage.

Keywords

• coal spontaneous combustion
• magmatic intrusion
• functional group
• thermogravimetry
• kinetics