浅埋藏煤层长综放面采空区自燃“三带”分布研究

利用采空区流场数学物理模型,基于COMSOL数值软件模拟了采空区氧浓度与漏风速度分布,采用氧气浓度划分法和漏风风速划分法相结合的方法划分自燃"三带",并通过现场监测"两道"氧浓度验证其可靠性。结果表明:长综放工作面采空区在"两道"漏风严重,氧化升温带在进、回风巷分布范围较广。

Study on Distribution Law of Spontaneous Combustion “Three Zones” in a Long Fully Mechanized Caving Face of Shallow-buried Coal Seam

Through using mathematical-physical model of gob flow field, distribution of oxygen concentration and velocity of air flow are determined based on COMSOL. The gob spontaneous“three zones” can be divided by the method of combining oxygen concentration with air leakage wind speed. And the simulated data is verified with measured oxygen concentration on the side of both intake and return airways. The results showed that the method is available and effective and the width of the oxidation and heat accumulation zone（OHAZ）in the gob of the long top-coal caving face is distributed more widely on the side of both intake and return airways for the serious air leak, which have certain guiding significance to prevent and control coal spontaneous combustion of the working face.