Research And Application Of Key Technologies On Coal Spontaneous Combustion In Small Coal Mines

The coal spontaneous combustion is an objective phenomenon of nature and one of the most severe natural disasters in coal mine. Small coal mines usually adopt room and pillar mining recovery method, with the problems of low recovery rate , more residual coal, laneway connecting with each other, severe ground subsidence, and oxygen supplying due to the long-term air leakage resulting in coal spontaneous combustion, seriously threatening to mine production safety. According to statistics, because fire disaster caused by small coal mines accounts for more than 95% of coal spontaneous combustion, , solvinging the coal spontaneous combustion in small coal mines has become a key to ensure the safety of the mine. According to the spontaneous combustion characteristics of the s small coal mines urrounding WangZhuang mine in Lu'an coal group, a project of fire prevention based on the fire area information detection techneque was bringed forward.Through the research on the coal spontaneous combustion mechanism and the coal spontaneous combustion influencing factor's,the small coal mines lack of geological and mining data and unidentified mining area, fire location, fire range, as well as fire trends determined difficulties. Air-leaking passage leads to long fire extinguishment time, hard fight and easy resurgence.In the process of drilling and grouting, using detection technology and equipment which is developed from Taiyuan University independently, monitoring the construction effect timely, adjusting infusion plasma parameters, using the changeable ratio of mixed slurry, filling and reinforcing the drilling hole changed the traditional weak situation of yellow-mud grouting. In order to suit the relevant state policies, the application of fly ash not only dealed with the waste, but also was conducive to environmental protection.The practice showed that it could control the spontaneous combustion in the small coal mines around WangZhuang coal mine based on fire area information detection technology, eliminating the influence of fire to WangZhuang coal mine, ensuring the production safety, saving lots of moneyand creating tremendous social benefits. This research is also useful to the domestic and international mine with similar situation.