采空区自燃过程中氧气场分布的动态特征研究
Study on Dynamic Characteristics of Oxygen Distribution During Spontaneous Combustion Stage in Goaf
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摘要: 为了更好地利用氧气指标对采空区自燃事故进行预警，利用数值方法对采空区氧气分布对于自燃阶段发展的动态响应机制进行了研究，结果表明：自燃初期，以氧气为指标的氧化带形成“楔形”分布结构；氧气分布会随温度的升高大面积回缩前移；以温度指标和氧气指标划分的氧化带宽度变化均呈现3个阶段，二者在各自的第2阶段出现重叠；改变漏风强度后会导致自燃带位置呈不同的变化趋势。现场需要把握氧气分布随温度的动态响应趋势，在自燃初期适合采用氧气指标，但在自燃中后期，宜采用温度指标划分氧化带位置。Abstract: In order to better use oxygen index for early warning of goaf spontaneous combustion accidents, numerical method is used to study the dynamic response mechanism of oxygen distribution on spontaneous combustion stage. The calculated results show that oxygen area becomes wedge-shape structure in early stage, and oxygen distribution can shrink back forward with increasing temperature. Then, the oxidation area width divided by oxygen or temperature index appears three stages which presents overlapping in the second stage. Oxidation area position presents different changing trend when air leakage strength is changed. The oxygen distribution dynamic response mechanism with temperature must be grasped in site, the oxygen index should be applied in early spontaneous combustion stage but the temperature index should be applied in latter stage.
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Keywords:
- oxygen index /
- numerical method /
- goaf /
- oxidizing area /
- spontaneous combustion
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[1] 秦波涛，张雷林，王德明，等.采空区煤自燃引爆瓦斯的机理及控制技术[J].煤炭学报，2009，34（12）：1655-1659. [2] 杨胜强,徐全,黄金，等.采空区自燃“三带”微循环理论及漏风流场数值模拟[J].中国矿业大学学报,2009,38(6):769-777. [3] 褚廷湘, 余明高, 杨胜强，等. 煤岩裂隙发育诱导采空区漏风及自燃防治研究[J].采矿与安全工程学报, 2010, 27(1): 87-93. [4] 李宗翔,吴强,肖亚宁.采空区瓦斯涌出与自燃耦合基础研究[J].中国矿业大学学报,2008,37(1):38-42. [5] Liming Yuan, Alex C. Smith. CFD modeling of spontaneous heating in a large-scale coal chamber[J].Journal of Loss Prevention in the Process Industries, 2009( 22):426-433. [6] A. Ejlali, D.J. Mee, K. Hooman, et al. Numerical modelling of the self-heating process of a wet porous medium[J].International Journal of Heat and Mass Transfer,2011(54):5200-5206. [7] 王福军. 计算流体动力学分析[M].北京：清华大学出版社，2004. [8] Smith MA, Glasser D. Spontaneous combustion of carbonaceous stockpiles. part I: the relative importance of various intrinsic coal properties and properties of the Reaction System [J]. Fuel,2005，84:1151-1160. [9] Yuan LM, Smith AC. Numerical study on effects of coal properties on spontaneous heating in longwall gob areas [J]. Fuel, 2008, 87:3409-3419. [10] Boleslav Taraba, Zdenek Michalec. Effect of longwall face advance rate on spontaneous heating process in the gob area - CFD modeling [J]. Fuel ,2011(4):1-8. [11] 梁运涛, 张腾飞,王树刚，等.采空区孔隙率非均质模型及流场分布模拟[J].煤炭学报,2009,34(9):1203-1207.
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