Study and practices on spontaneous combustion control technology of mine coal waste pile

In order to effectively prevent and control the spontaneous combustion occurred on the mine coal waste pile,based on South No.4 coal waste spontaneous combustion fire zone in Baijigou Mine as a study object, according to the spontaneous combustion features of the mine coal waste pile,an infrared imaging technology and a remote temperature monitoring and measuring technology were applied to detect the spontaneous combustion scope and degree of the coal waste. According to the measu red temperature distribution conditions of the deep borehole and shallow borehole in the coal waste pile,a comprehensive control technical measures mainly with"loess CoV ered,loess isolation and loess grouting"were designed and implemented. The oxygen supply in the coal waste fire area was effectively restrained and the fire area to be furt her developed was prevented. With the reduction of the high temperature in the fire area and the direct fire extinguishing,the CO at the upper corner of No. 2521 coal minin g face affected by the surface coal waste fire was eliminated and the safety mining of the coal mining face could be ensured.