The stage analysis and countermeasures of coal spontaneous combustion based on “five stages” division

• DOI: 10.1371/journal.pone.0202724
• Publication Date: 2018-08-23T13:48:42Z
• Authors: Hongqing Zhu; Kai Sheng; Yilong Zhang; Shuhao Fang; Yunlong Wu
• Keywords: Spontaneous Combustion

The "three stages" division of coal spontaneous combustion is fuzzy and lacks adequate risk warning levels corresponding to its divisions; additionally, the targeted prevention measures for each stage have not been described. To address shortcomings division, "five was proposed more clearly analyze changes coal. method divides process into five stages, including: latent stage, heat accumulating evaporation active hypoxic stage. critical point determined using adiabatic oxidation experiments programmed experiments. As temperature zero activation energy approximately 55-70°C. In (approximately 90°C) where external moisture evaporates violently while internal has yet fully evaporated. During 105°C) evaporated completely represents end this start (105-170°C). When oxygen concentration drops 5%, enters Thus, an 5% (above 170°C). After analysis were determined. Considering major coal, a staged disposal table created.