Research On Influential Effects On Spontaneous Combustion Of Coal In The Goaf Under The Condition Of High Drilling Drainage

High Drilling Drainage Methane is one of the effective means in governing gas exceeding of upper corner and face. The leakage flow field in goaf is changed by the gas drainage which have an important influence on spontaneous combustion in goaf. The increase of goaf leakage also makes dangerous region distribution in goaf more complex. Therefore, studying the effects of high drilling drainage methane on spontaneous combustion of coal in goaf can provide the basis for determining comprehensive prevention and control technology of coal spontaneous.In this paper, an integrated method that is composed of the theoretical analysis, experimental test, numerical simulation and field observation was applied to analyze the influence factors of High Drilling Drainage Methane on float coal spontaneous combustion of goaf. Index gases of Xinjiang Liuhuanggou coal mine(4-5) 04 face were selected and the leakage regularity of goaf was simulated under the condition of gas drainage. Through the field observation, distribution regularity of "three zone" in goaf could be mastered.By analyzing the influence of High Drilling Drainage Methane on float coal spontaneous combustion of goaf, the effect is mainly reflected in the increased channel in goaf air leakage, the power enhancement and increase of leakage, inerting balance destruction of goaf and increased risk of spontaneous combustion of coal. Based on the experiments of coal spontaneous combustion temperature-programmed, many parameters such as the characteristic temperature of coal sample oxidation in(4-5) 04 face, the generation rate of index gas can be measured. Grignard fire coefficient method is used to determine the method for risk degree of coal spontaneous combustion in goaf under the condition of gas drainage. By simulating the regularity of leakage under the condition of the gas drainage and non drainage, the leakage rate and oxygen concentration distribution in different drilling location and different negative pressure can be mastered. Finally, the distribution of spontaneous combustion "three zone" in goaf is obtained by field test, which verifies the reliability of the simulation results and has guiding significance for the prevention and control of coal spontaneous combustion in high drilling drainage methane position of the mine.