Coal Spontaneous Combustion Tendency And Management Technology Of Fire Region In Steeply Inclined Coal Seam Of Taiping Coal Mine

Based on the coal spontaneous combustion mechanism, judging hazard of coal spontaneous fire, prediction and forecast, regional detection method of fire source, prevention and extinguishments of coal fire and so on, this paper aimed at the main existing problem on management technology of coal spontaneous combustion and fire region in steeply inclined coal seam of Taiping coal mine of Panmei, the impact factors of coal spontaneous combustion were analyzed; spontaneous combustion tendency experiment was conducted; and the mechanism of complex colloids on prevention and extinguishments of coal fire, preparations of complex colloids and method and application of injected colloids were all researched. The conclusions and accomplishments acquired were as follows:1) Different coal-rock composition exhibits different oxidation behavior during different temperature phases, due to such complication and heterogeneity, it resulted that different coal embodied different oxidation process during different phases.2) when the initial temperature of 21-2~# coal seam of Tai-ping coal mine was 20 centigrade, average particle size 3.61mm, its natural ignition time was 65 days; while its temperature reached critical temperature, 60 to 75 centigrade, the obvious fire period was almost 16 days.3) When the coal temperature of Tai-ping coal mine was around 60 centigrade, the thickness of float coal was lower than 0.7m, the float coal didn't combust; alternatively, with the thickness of float coal, the lower oxygen concentration decreased drastically; when the coal temperature was around 60 centigrade, if only air leakage strength was higher than the upward limit at this temperature, the float coal didn't combust either; while the coal temperature was around 60 centigrade, if the thickness of float coal was below the limited thickness, the float coal didn't combust either.4) due to the complex colloids, which could hamper physical absorption, chemical absorption, and chemical reaction of coal seam, and it resulted that it increased the velocity of relieving heat and absorbing a large amount of heat, decreased the temperature of coal seam and velocity of relieving heat between coal and oxygen, and through absorbing heat to decrease temperature, it decreased the oxidant activity of coal, and thus resulted in the extinguishment of coal fire. 5) aimed at the fly ash abandoned largely after power plant produced coalmine waste, the complex colloids used as prevention and extinguishments of coal fire and suitable for the management of gob fire management in top working face in steeply inclined coal seam of Taiping coal mine was developed; besides, it didn't produce hazard materials polluting the coal mine environment, and it had the property of accumulation and low costing.6) According to the actual situation of Tai-ping coal mine, the technology of prevention and extinguishments of coal fire was raised, the movable injected colloids system of prevention and extinguishments of coal fire underground was constructed, and operational crafts of injected colloids was ascertained.The problem of impossible observation and the difficult management of fire region connected to the ground under positive pressure ventilation were solved. The outcome showed that the safety guarantee on working face was acquired and the economical and social benefits of fire region were enhanced.