3D numerical simulation on the spontaneous combustion of loose coal in the top-coal caving region of full seam roadway with large section

Based on the analysis of characteristics of the top-coal caving region of full seam roadway with large section and factors of coal spontaneous combustion,the 3D mathematical model of spontaneous combustion of loose coal in the top-coal region was proposed using the theories of fluid dynamics in porous medium,heat transfer and mass transfer.By using the Fluent software,the temperature field and the oxygen concentration field in different time and positions were obtained during the combustion process of loose coal in the top-coal caving region in 11201 workface of Zaoquan Coal Mine.Analysing the process of coal spontaneous combustion and the rule of high temperature region moved in the top-coal region,specifying the lower part of top-coal region is the most possible area where spontaneous combustion might take place,which is the key place to prevent the fire in the fields.The validity of the numerical simulation results is verified by the measured data.