吉新煤矿煤自然发火预测预报及防治技术研究

发布时间：2018-07-10 15:48

本文选题：采空区 + 煤自燃　；参考：《西安科技大学》2013年硕士论文

【摘要】：煤自燃火灾严重威胁着矿井安全生产，不仅能引发一些次生灾害，还能造成巨大的资源浪费和财产的损失。综放工艺的特殊性，使得较厚煤层“两侧”顶煤放出率较低，造成采空区遗煤较多，开放式的通风，使得漏风现象严重，容易引发火灾。采空区浮煤自燃是急需解决的问题，它直接影响矿井工作面的安全生产。本文以吉新煤矿11A601工作面为研究对象，从采空区浮煤的自身的性质及环境的影响出发，分析煤自然发火规律，划分出煤自燃危险区域。首先采用XK-III型煤自然发火实验台研究煤自燃过程，测定煤自燃的放热强度、耗氧速度，特征温度和发火期等表示煤自燃程度的特性参数；其次通过现场观测，，得到采空区浮煤厚度、氧气浓度和漏风强度分布规律图，依据实验和现场的数据建立采空区渗流数学和物理模型,利用Fluent软件对采空区流场进行数值模拟，得出采空区内的渗流速度和氧气浓度分布规律；再次，利用自燃危险区域判定理论结合数值模拟以及现场观测数据，得出采空区自燃危险区域范围以及极限推进速度，为防灭火提供依据；最后，应用注氮防灭火理论，结合工作面实际情况，制定制氮方案，对采空区进行注氮防灭火工作，利用束管监测，反馈并调整注氮参数，分析注氮防灭火的效果，以便更好的指导现场防灭火工作。
[Abstract]:Coal spontaneous combustion fire is a serious threat to mine safety, which can not only cause some secondary disasters, but also cause huge waste of resources and loss of property. Because of the particularity of fully mechanized caving technology, the caving rate of "both sides" top coal in thick coal seam is low, resulting in more coal left in goaf, open ventilation, serious air leakage phenomenon and easy to cause fire. Spontaneous combustion of floating coal in goaf is an urgent problem, which directly affects the safe production of coal face. This paper takes the 11A601 face of Jixin Coal Mine as the research object, starting from the nature of floating coal in goaf and the influence of environment, analyzes the law of coal spontaneous combustion, and divides out the dangerous area of coal spontaneous combustion. First, the spontaneous combustion process of coal is studied with XK-III coal spontaneous combustion test bench, and the characteristic parameters of coal spontaneous combustion, such as exothermic intensity, oxygen consumption velocity, characteristic temperature and ignition period, are measured. The distribution pattern of floating coal thickness, oxygen concentration and air leakage intensity in goaf is obtained. The mathematical and physical model of seepage flow in goaf is established based on experiment and field data, and the flow field in goaf is numerically simulated by fluent software. The distribution law of seepage velocity and oxygen concentration in goaf is obtained. Thirdly, the range of danger zone of spontaneous combustion in goaf and the limit propelling velocity are obtained by combining with numerical simulation and field observation data. Finally, applying the theory of nitrogen injection to prevent and extinguish fire, combined with the actual situation of the working face, the scheme of nitrogen production is formulated, and the nitrogen injection fire extinguishing work is carried out in the goaf, and the parameters of nitrogen injection are feedback and adjusted by the monitoring of the beam tube, the feedback and the adjustment of the parameters of nitrogen injection. The effect of nitrogen injection on fire prevention and extinguishing is analyzed in order to better guide the field fire prevention and extinguishing work.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD752

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