鲍店矿瓦斯异常区采空区煤自燃特点及防控措施研究
发布时间：2018-08-07 20:33
【摘要】：近年来我国矿井开采深度不断增大,一些矿井采掘过程中出现了瓦斯异常涌出现象,造成工作面瓦斯超限及局部瓦斯聚积,降低工作面推进速度,增大采空区遗煤自燃危险性。本文以鲍店矿七采区73上09工作面为研究对象,采用实验研究、数值模拟和现场实测等方法对瓦斯异常区采空区煤自燃特点及防控措施进行了分析与研究。由于现有程序升温实验装置温度不易控制,煤样受热不均且气密性较差,不符合瓦斯对煤自燃特性影响的实验要求,故搭建了一体式煤自燃性测试实验装置,采用一体式设计,操作简便,装煤量250g,用油量4.9L,供风量为7.4~39.9ml/min,实验装置在煤样升温速率稳定性、煤样温度均匀性以及实验装置气密性上满足实验要求。根据实验结果,煤样临界温度75℃~90℃,干裂温度110℃~120℃,优选CO气体和C_2H_4气体作为主要的煤自燃预报性指标气体,选择混样作为瓦斯对煤自燃特性影响实验的粒度。根据实验结果,瓦斯对煤自燃进程起到了抑制作用,在利用CO气体和C_2H_4气体作为煤自燃预报性指标气体时应将气体指标浓度适当降低。同时根据实验结果得到煤自燃极限参数,为采空区自燃“三带”划分提供理论依据。通过数值模拟研究掌握了73上09工作面在风速和实施隅角瓦斯治理作用下采空区漏风和氧浓度场分布规律,当增大工作面风速或实施隅角瓦斯治理措施后,采空区氧化升温带向采空区深部移动,且其宽度加大,增加了采空区遗煤自燃危险性。对鲍店矿73上09工作面进行现场实测,划分出采空区自燃“三带”,确定采空区煤自燃重点防控区域,得出进风侧氧化升温带50~120m,回风侧氧化升温带20~40m,工作面最小推进速率为2.69m/d。根据实验结果、数值模拟以及现场实测,制定出对应的防控措施,主要包括:对本面采空区及沿空侧采空区采取粉煤灰灌浆防灭火措施,利用无机固化膨胀充填措施进行堵漏风,将胶体阻化防灭火技术作为应急处理措施。根据监测数据,回采期间及停采、回撤、封闭时期,CO浓度控制在24ppm以内,采空区没有发生遗煤自燃现象,实现了73上09工作面安全高效生产。
[Abstract]:In recent years, the depth of mine mining in our country has been increasing, some abnormal gas emission phenomenon appears in the mining process of some mines, which results in the gas exceeding limit and local gas accumulation in the working face, reduces the speed of working face advance, and increases the danger of spontaneous combustion of the coal left over the goaf. In this paper, the characteristics of coal spontaneous combustion and control measures in goaf in abnormal gas area are analyzed and studied by means of experimental study, numerical simulation and field measurement, taking 73 Shang09 face of No. 7 mining area of Baodian Mine as the research object. Because the temperature of the existing programmed temperature test equipment is not easy to control, the coal sample is unevenly heated and the gas tightness is poor, which does not meet the experimental requirements of the influence of gas on the spontaneous combustion characteristics of coal, so an integrated coal spontaneous combustion test device is built, and the integrated design is adopted. The operation is simple, the coal loading capacity is 250g, the oil quantity is 4.9 L, and the air supply rate is 7.4 ~ 39.9ml / min. The experimental device meets the experimental requirements in terms of the stability of the coal sample heating rate, the uniformity of the coal sample temperature and the gas tightness of the experimental device. According to the experimental results, the critical temperature of coal sample is 75 鈩，
本文编号：2171269
[Abstract]:In recent years, the depth of mine mining in our country has been increasing, some abnormal gas emission phenomenon appears in the mining process of some mines, which results in the gas exceeding limit and local gas accumulation in the working face, reduces the speed of working face advance, and increases the danger of spontaneous combustion of the coal left over the goaf. In this paper, the characteristics of coal spontaneous combustion and control measures in goaf in abnormal gas area are analyzed and studied by means of experimental study, numerical simulation and field measurement, taking 73 Shang09 face of No. 7 mining area of Baodian Mine as the research object. Because the temperature of the existing programmed temperature test equipment is not easy to control, the coal sample is unevenly heated and the gas tightness is poor, which does not meet the experimental requirements of the influence of gas on the spontaneous combustion characteristics of coal, so an integrated coal spontaneous combustion test device is built, and the integrated design is adopted. The operation is simple, the coal loading capacity is 250g, the oil quantity is 4.9 L, and the air supply rate is 7.4 ~ 39.9ml / min. The experimental device meets the experimental requirements in terms of the stability of the coal sample heating rate, the uniformity of the coal sample temperature and the gas tightness of the experimental device. According to the experimental results, the critical temperature of coal sample is 75 鈩，
本文编号：2171269
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