Comprehensive Fire Prevention and Control Technology for Fully Mechanized Top Coal Caving Mining Face in Easy Spontaneous Combustion Seam During Face Equipment Withdrawn Period

According to the short spontaneous combustion period (23 days) of the seam in No.Y162 fully mechanized top coal caving mining face in Yangchangwan Mine, there was a high spontaneous combustion danger in the coal mining face.The length of No.Y162 fully mechanized top coal caving mining face was 300 m and the conditions of the railway hoisting and others during the face withdrawn period was complicated.Based on the enhanced forecasting and prediction of the coal spontaneo us combustion, in order to reduce the withdrawn time, the sandbag wall, the backill of the surface ground cracking and other measures were applied to reduce the air | eakage in the goaf.During the withdrawn period, with two buried pipelines, the glue injection, nitrogen injection and grouting in the goaf with the boreholes between the powered supports, and the comprehensive fire prevention and control measures, the CO volume fraction of the coal mining face during the withdrawn period was kept b elow 24x10-6 to ensure the successful and safety withdrawn of the coal mining face.