黄岩汇矿综放面采空区煤自燃危险区域划分及数值模拟研究

发布时间：2018-01-28 02:54

本文关键词： 高瓦斯采空区抽放自然发火数值模拟　出处：《西安科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：煤层自燃火灾严重威胁着我国矿井安全生产，其可能引发瓦斯、煤尘爆炸事故，酿成人员伤亡等的重大恶性事故。高瓦斯矿采空区浮煤自燃更是我们急需解决的问题，它直接影响矿井工作面的安全生产。综采放顶煤技术对矿井实现高产高效起到重要作用。但是，由于综放面开采煤层厚度大，尤其是采空区“两道”“两线”顶煤放出率低，造成“两道”“两线”处遗煤量较多，高瓦斯矿井为减小采空区瓦斯浓度，实施高抽巷和瓦斯排放专用巷对采空区瓦斯进行抽放，加大了采空区漏风，增加了浮煤自燃危险性。因此，准确判定综放采空区在抽放条件下浮煤自燃危险区域的位置是预防和扑灭采空区自然发火的关键。本文以黄岩汇煤矿15109工作面为研究背景，从高瓦斯矿井抽放条件下综放采空区浮煤自燃的特点出发，对其采空区在高抽巷及瓦斯排放专用巷同时运行条件下的漏风流场及氧浓度分布进行数值模拟研究。首先，在目前的煤自然发火机理、渗流力学、自然发火预测、自燃危险区域判定及数值模拟研究现状的基础上，通过实验模拟测定煤层自然发火相关特性参数，利用相关学科知识，建立综放采空区在高抽巷及瓦斯排放专用巷同时运行条件下气体渗流预测模型，，对其进行数值模拟计算。然后，通过改变高抽巷抽采负压来研究其对采空区“三带”的影响。最后，根据实际现场观测，对综放采空区在高抽巷及瓦斯排放专用巷同时运行条件下采空区自燃危险区域进行静态划分，验证建立的数学模型的可靠性和准确性。研究结果对指导同类型矿井采空区煤自燃防治具有极大的意义。
[Abstract]:Spontaneous combustion of coal seam is a serious threat to the safety of mine production in China, which may lead to gas, coal dust explosion accident. It is an urgent problem for us to solve the problem of spontaneous combustion of floating coal in goaf of high gas mine, which directly affects the safety of mine face. Fully mechanized top coal caving technology plays an important role in realizing high yield and high efficiency in coal mine. However, because of the large thickness of coal seam in fully mechanized caving face, especially the low caving rate of "two channels" and "two lines" in goaf. In order to reduce the gas concentration in the goaf, the high gas mine carries out the high drainage roadway and the special roadway of gas drainage to drain the gas from the goaf, which increases the air leakage in the goaf. Therefore, it is the key to prevent and extinguish spontaneous combustion in fully mechanized caving caving area. Based on the research background of 15109 face of Huang Yan Hui Coal Mine, this paper starts from the characteristics of spontaneous combustion of floating coal in fully mechanized caving area under the condition of high gas drainage. Numerical simulation of the air leakage field and oxygen concentration distribution in the goaf under the condition of high drainage roadway and special gas drainage roadway is carried out. Firstly, in the present coal spontaneous combustion mechanism, seepage mechanics. On the basis of prediction of spontaneous combustion, judgement of spontaneous combustion danger area and numerical simulation, the related characteristic parameters of spontaneous combustion of coal seam are measured by experimental simulation, and relevant subject knowledge is utilized. The prediction model of gas seepage in fully mechanized caving goaf under the condition of high drainage roadway and special roadway for gas drainage is established, and the numerical simulation calculation is carried out. By changing the negative pressure of high extraction roadway to study its influence on the "three zones" of goaf. Finally, according to the actual field observation. Under the condition of high drainage roadway and special roadway for gas drainage, the danger area of spontaneous combustion of goaf in fully mechanized caving caving is divided statically. The reliability and accuracy of the established mathematical model are verified. The results of the study are of great significance to guide the prevention and control of coal spontaneous combustion in the goaf of the same type of mines.
【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】：TD75

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