浅埋藏煤层长综放面采空区自燃“三带”分布研究

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

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。

Based on mathematical physical model of goaf flow field, distribution of oxygen concentration and velocity of air flow were simulated with COMSOL. The gob spontaneous ＂three zones＂ were classified according to oxygen concentration and air leakage wind speed. And reliability of the result was verified through in - situ measurement of oxygen concentration on both sides of intake and return airways. The results show that, the oxidation and heat accumulation zone is distributed more widely in intake and return airways, air leakage is serious in both sides of intake and return airways in long fully mechanized caving face.