【摘要】 为了分析空气在松散煤体中渗流对煤体自热和自燃的影响,根据多孔介质中气体的渗流理论,建立了测试松散煤体渗透系数的试验装置,分别从宏观上探讨了不同空隙分布和粒度分布下松散煤体的渗流规律。研究表明,同一空隙率在不同空隙分布下的渗透系数服从正态分布;粒度分布对空气在煤体中渗流的影响比空隙率大。在试验测定范围内,粒度在1.25 mm以下的粉煤是影响整个粒度分布下的煤体渗流的关键。结合实际防治地面煤堆自燃的方法,给出了不同厚度比的粉煤(0~3 mm)覆盖较大粒度(3~6 mm)煤体时,渗透系数与厚度比的定量关系式。更多还原

【Abstract】 In order to analyze the air transfusion in the loose coal mass affected to the coal spontaneous heating and spontaneous combustion,according to the air transfusion theory in the multi holes medium,a test device to measure the penetration coefficient of the loose coal mass was established.The paper individually from the macroscopic view discussed the transfusion law of the loose coal mass with different air gap distribution and different particle distribution.The study showed that the penetration coefficient with the same air gap rate under different air gap distribution would obey the normal distribution.The particle distribution would have more influence to the air transfusion in the coal mass than to the air gap rate.The test measured scope,fine coal with particle less than 1.25 mm would be the key to influence the whole particle distribution.In combined with the actual prevention and control the spontaneous combustion of the ground coal pile,the paper provided that when the different thickness rate of fine coal(0~3 mm) were applied to cover the coal mass with a large coal particles(3~6 mm),the penetration coefficient and the thickness rate could be a quantity formulation formula.更多还原