近直立煤层短壁综放工作面采空区注氮流量与自燃“三带”分布关系
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摘要
乌东煤矿近直立煤层内短壁综放面采空区遗煤量多、漏风复杂,易致出现自燃火灾,因此,矿井将注氮防灭火技术作为采煤工作面的日常主要自燃火灾防治技术手段。向采空区注入氮气,不可避免地会对采空区内自燃"三带"的分布范围产生影响,为了考察不同注氮流量条件下采空区自燃"三带"分布范围的变化规律,采用预埋束管的方法,测定了不注氮、小流量注氮、大流量注氮3种不同条件下采空区不同位置的氧气浓度,并依据采空区自燃"三带"氧气浓度指标进行了"三带"分布范围划分,通过对比划分结果,明确了短壁综放工作面随采空区注氮流量的增加,"三带"边界都向工作面方向移动,散热带、氧化带宽度都将缩小,大流量注氮后散热带基本消失。
There is a large amount of residual coal and complicated air leakage in goaf of short-wall fully mechanized caving face near vertical coal seam in Wudong Coal Mine, which is easy to cause spontaneous combustion fire. Therefore, the nitrogen injection fire-fighting technology is taken as the main means of spontaneous combustion prevention and control at the working face of coal mining. Nitrogen injection into goaf will inevitably affect the distribution range of spontaneous combustion "three zones"in goaf. In order to investigate the variation laws of the distribution range of goaf spontaneous combustion "three zones"under different nitrogen injection flow rates, the oxygen concentration at different positions of goaf under three different conditions of non-nitrogen injection,low-flow nitrogen injection and high-flow nitrogen injection was determined by using the method of embedded beam tube. According to the oxygen concentration index of goaf spontaneous combustion "three zones", the distribution range of "three zones"is divided.Through the comparison and division results, it is clear that with the increase of nitrogen injection flow rate in goaf, the boundaries of the "three zones"all move towards the working face, the width of the heat dissipation zone and the oxidation zone will decrease, and the heat dissipation zone will basically disappear after nitrogen injection at a large flow rate.
There is a large amount of residual coal and complicated air leakage in goaf of short-wall fully mechanized caving face near vertical coal seam in Wudong Coal Mine, which is easy to cause spontaneous combustion fire. Therefore, the nitrogen injection fire-fighting technology is taken as the main means of spontaneous combustion prevention and control at the working face of coal mining. Nitrogen injection into goaf will inevitably affect the distribution range of spontaneous combustion "three zones"in goaf. In order to investigate the variation laws of the distribution range of goaf spontaneous combustion "three zones"under different nitrogen injection flow rates, the oxygen concentration at different positions of goaf under three different conditions of non-nitrogen injection,low-flow nitrogen injection and high-flow nitrogen injection was determined by using the method of embedded beam tube. According to the oxygen concentration index of goaf spontaneous combustion "three zones", the distribution range of "three zones"is divided.Through the comparison and division results, it is clear that with the increase of nitrogen injection flow rate in goaf, the boundaries of the "three zones"all move towards the working face, the width of the heat dissipation zone and the oxidation zone will decrease, and the heat dissipation zone will basically disappear after nitrogen injection at a large flow rate.
引文
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[2]吴玉国,邬剑明,张东坡,等.综放工作面连续注氮下采空区气体分布及“三带”变化规律[J].煤炭学报,2011,36(6):964-967.
[3]马东,秦波涛.综放工作面采空区注氮量与氧化自燃带分布关系[J].煤炭科学技术,2016,44(4):78-82.
[4]张国枢,戴广龙.煤炭自燃理论与防治实践[M].北京:煤炭工业出版社,2002:85-91.
[5]孙维丽,曲宝,李东发,等.采空区自燃“三带”划分方法改进[J].煤矿安全,2017,48(8):159-161.
[6]贾海林,翟晨光.采空区煤自燃“三带”空间分布特性研究[J].能源与环保,2017,39(1):5-10.
[7]杜斌,艾兴.复合采空区自燃“三带”范围确定方法[J].煤矿安全,2016,47(12):187-191.
[8]张荣刚.上湾煤矿采空区自燃“三带”范围确定与分析[J].能源技术与管理,2016,41(5):94-95.
[9]童校长,宋家勇.综采工作面采空区自燃“三带”测定技术[J].煤炭技术,2016,35(3):168-170.
[10]胡建洋,赵耀江,侯振海.综放工作面连续注氮下采空区“三带”变化规律[J].煤炭技术,2015,34(9):137-139.
[11]段春生,雷炎云,李世雄,等.不同风量下采空区自燃三带判定及防灭火技术[J].煤炭科学技术,2015,43(1):62-65.