下分层工作面煤自燃探测与预报技术研究

发布时间：2018-01-25 18:26

  本文关键词： 标志性气体 能位分布 漏风测试 示踪气体 热像特征　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：针对下分层工作面容易出现漏风诱发煤炭自燃,且因下分层工作面条件复杂,直接、准确定位煤自燃区域难度大的问题,本文从下分层工作面自燃产生的原因、条件、监测与预警以及防治方法等方面,系统探讨了下分层工作面煤自燃问题。采集现场煤样并分析了煤样自燃特性,测试了煤升温氧化过程中的气体产出特征,优选了煤自燃的标志性气体,研究了气体产物生成量与煤温之间的关系,确定了预测预报煤自燃标志性气体的指标值。在工作面能位分布测试的基础上,利用便携式SF6检测仪,采用移动检测点的方法,测算了大面积范围漏风的最短路径,确定了下分层工作面顶板漏风风速和漏风量,圈定了煤层自燃的漏风供氧区域,为监测下分层工作面自燃与防控提供了理论依据。采用布置测温和测气装置,并借助红外热成像仪,观测了工作面两巷高温区域,辨识了煤自燃发生早期征兆,制定了工作面综合防灭火措施。己16-17-22072工作面试验研究结果表明:测试的煤样自燃倾向性等级为Ⅰ级,属于容易自燃煤。煤样常温下氧化气体产物中不仅有CO和C02,甚至出现了 C2H4和C2H6,表明了煤样具有很强的氧化性。当出现CO时,说明煤温达到了 70℃,出现C3H8时,煤温已达到110℃。由于试验工作面顶板密实程度不一,漏风具有层状特征,但漏风量分布不均,最大漏风地点在F1断层附近,是煤自燃易发区段;最小漏风地点在距初切眼370m～680m范围内。红外热成像及定点观测的气体和温度监测结果验证了漏风测试结果的准确性。通过在工作面风巷顶板喷注高分子材料,形成挡风隔离墙等防治措施,有效控制了煤自燃进程。研究结果为类似条件下的煤自燃防治提供了借鉴作用。
[Abstract]:In view of the coal spontaneous combustion caused by air leakage in the lower stratified working face, and because of the complicated condition, direct and accurate location of the coal spontaneous combustion area, this paper analyzes the causes of spontaneous combustion in the lower stratified working face. In terms of conditions, monitoring and early warning, and prevention and control methods, this paper systematically discusses the problem of coal spontaneous combustion in the lower stratified working face, collects the spot coal samples and analyzes the spontaneous combustion characteristics of the coal samples. The characteristics of gas production in the process of coal heating and oxidation were tested, the signature gas of coal spontaneous combustion was selected, and the relationship between the amount of gas product and coal temperature was studied. Based on the test of energy level distribution in the working face, the portable SF6 detector is used to detect the moving points. The shortest path of air leakage in a large area is calculated, the wind speed and air leakage amount of roof air leakage are determined, and the air leakage oxygen supply area of spontaneous combustion of coal seam is delineated. This paper provides a theoretical basis for monitoring the spontaneous combustion and prevention and control of the lower stratified working face. The early signs of coal spontaneous combustion are identified by using the arrangement of temperature measurement and gas measuring device and the infrared thermal imager to observe the high temperature area of the two roadways of the working face and to identify the early signs of coal spontaneous combustion. The comprehensive fire prevention and extinguishing measures have been established. The experimental results of 16-17-22072 face show that the spontaneous combustion tendency of the coal samples tested is grade 鈪，

本文编号：1463414