Analyzing on Surroundings and Characteristics of Coal Self-Ignition in Goaf in a Fully Mechanized Top-Coal Caving Face

The goaf in a fully mechanized top-coal caving face was one of the areas in which coal self-ignited in mine easily.According the characteristics of fully mechanized top-coal technique and investigation and observation,the main characteristics of coal self-ignition in goaf in a fully mechanized top-coal caving face was summarized.Based on analyzing the environment of goaf,though analyzing the key factors,such as float coal thickness,intensity of air leakage,temperature,the theory that dynamic changes of coal self-ignition process caused by surroundings of goaf was pointed out.Along with working face pushing,the factors which influent coal self-ignition would change,such as float coal thickness,intensity of air leakage,etc.Thereby thermal storage and heat production would change.Parts of conclusion were fulfilled for further perfecting spontaneous combustion theory and control technology,and the conclusion has provided new ways and means for fire forecasting in goafs.