复杂氧化条件下白杨河矿区煤体自燃规律及防治技术研究OA

To reveal the influence laws of gas occurrence and coal spontaneous combustion characteristics on the spontaneous combustion period of coal,based on the mining characteristics of the Baiyanghe mining area,this study employs programmed temperature-rise experiments combined with the gas occurrence conditions in the coal mine.The relationships among relative gas emission rate,oxidation rate,and the spontaneous combustion period are analyzed.Macroscopic characteristic tests of coal spontaneous combustion under complex oxidation conditions,including primary oxidation,secondary oxidation,and low-oxygen oxidation,are carried out to investigate the coal spontaneous combustion characteristics under complex oxidation conditions in the mining area,and targeted prevention and control measures are formulated.The study finds that gas occupies the pores and fractures of coal.A high gas concentration inhibits the contact between oxygen and coal,reducing the oxygen consumption rate and thereby prolonging the spontaneous combustion period.For coal undergoing secondary oxidation,the oxygen consumption rate accelerates,heat accumulates more rapidly,and the spontaneous combustion tendency significantly increases,thus shortening the spontaneous combustion period.When the oxygen concentration around the coal is 10.0%,the spontaneous combustion characteristics of coal at 60～80 ℃are significantly affected by the oxygen concentration,while the influence of oxygen concentration on coal spontaneous combustion is weaker at low temperatures.Finally,based on the coal spontaneous combustion characteristics in the mining area,low-temperature inerting and sealing technologies are proposed,and a comprehensive fire prevention and control technology system is established for the mining area.