陈家沟矿3204综放工作面采空区煤自燃防控技术研究

发布时间：2018-04-01 07:27

本文选题：采空区　切入点：自燃特性参数　出处：《西安科技大学》2017年硕士论文

【摘要】：煤层自燃是由于煤体与氧气之间发生氧化反应释放出热量,积聚到一定程度的结果,而开采煤层又为煤层采空区自燃提供了必要的条件,为有效地控制采空区煤层自燃发生,杜绝由此引发的火灾事故,做出陈家沟煤矿3204综放工作面采空区煤自燃防控技术研究就具有十分重要的现实意义。本文以陈家沟煤矿3204综放工作面采空区为背景,通过煤样自然发火实验,测试出煤自燃发火天数及自燃特点。对煤自燃特性参数进行分析,计算出了不同浮煤厚度时的下限氧浓度与上限漏风强度,计算出不同漏风强度时的极限浮煤厚度。通过现场观测,得出工作面水平和垂直“三带”分布规律。利用用Fluent软件,针对3204数值模拟区域模型进行了分析,得出采空区氧浓度分布情况、氧浓度渗流速度和渗流方向,再计算出陈家沟煤矿3204采空区得极限浮煤厚度、下限氧浓度、极限浮煤厚度时的漏风强度、工作面推进速度、自然发火期这5个浮煤自燃参量,在此基础上根据采空区自燃危险区判定条件,得出了 3204工作面中部距切眼26米至80米左右范围内,回风侧距切眼18米至110米左右范围内,进风测距切眼18米至65米范围内为采空区自燃危险区域,最佳推进速度不要小于每天3米。根据陈家沟煤矿3204综放工作面实际开采情况,制定了 3204综放工作面采空区煤自燃监测预报、预防与治理技术方案体系,实现了科学防火,做到了有的放矢,把有限的安全资金投入到最需要的地方,发挥出了最大的安全效益。工作面于2014年10月26日正式回采,2015年5月3日回采完毕,3204工作面采出量为172.71万吨,工作面回采率为91.45%,未发生火灾,采用的防灭火措施起到了应有的作用。
[Abstract]:Spontaneous combustion of coal seam is the result of the oxidation reaction between coal body and oxygen to release heat and accumulate to a certain extent. The coal seam opening provides necessary conditions for spontaneous combustion in goaf of coal seam and effectively controls the occurrence of spontaneous combustion of coal seam in goaf. To put an end to the fire accident caused by the accident, it is of great practical significance to study the technology of preventing and controlling the spontaneous combustion of coal in the goaf of No. 3204 fully mechanized caving face of Chenjiagou Coal Mine. This paper takes the goaf of 3204 fully mechanized caving face of Chenjiagou Coal Mine as the background. The spontaneous combustion days and characteristics of coal spontaneous combustion were tested through the spontaneous combustion experiments of coal samples. The parameters of coal spontaneous combustion characteristics were analyzed, and the lower oxygen concentration and upper limit air leakage intensity were calculated under different floating coal thickness. The limit floating coal thickness with different air leakage intensity is calculated. The horizontal and vertical "three zones" distribution law of the face is obtained by field observation. The 3204 numerical simulation region model is analyzed by using Fluent software. The distribution of oxygen concentration in goaf, the percolation velocity and direction of oxygen concentration in goaf are obtained, and the maximum floating coal thickness, the lower oxygen concentration, the air leakage intensity and the working face advancing speed in 3204 goaf of Chenjiagou coal mine are calculated. On the basis of these five parameters of spontaneous combustion of floating coal in spontaneous combustion period, according to the judging conditions of spontaneous combustion danger area in goaf, it is obtained that the middle part of 3204 face is within the range of 26 meters to 80 meters from the cutting hole, and the air return side distance from the cutting hole is 18 meters to 110 meters. The range from 18 meters to 65 meters for the cut hole by wind distance is the danger area of spontaneous combustion in goaf, and the best speed of propulsion should not be less than 3 meters per day. According to the actual mining situation of 3204 fully mechanized caving face in Chenjiagou Coal Mine, The monitoring and forecasting of spontaneous combustion of coal in goaf of 3204 fully mechanized caving face, the technical scheme system of prevention and control have been formulated, the scientific fire prevention has been realized, the target has been achieved, and the limited safety funds have been put into the place where the most need is needed. The maximum safety benefit has been brought into play. The coal face was formally mined on October 26, 2014. The mining capacity of the working face was 1.7271 million tons on May 3, 2015, and the recovery rate of the working face was 91.45. There was no fire. The measures adopted to prevent and extinguish fire have played a due role.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD752.2

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