高抽巷抽采条件下综采面采空区煤炭自燃防治技术研究

发布时间：2018-02-24 11:19

本文关键词： 指标气体高抽巷数值模拟自燃“三带”　出处：《安徽理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：火灾和瓦斯是制约煤矿安全、高效发展的两大主要灾害,目前很多矿井采用高抽巷瓦斯抽采方法治理瓦斯超限,这种方法在治理瓦斯灾害的同时也对采空区漏风场造成很大的影响,增加了遗煤自然发火的概率。因此,预防高抽巷抽采条件下采空区遗煤自燃,避免火灾事故的发生,具有重要而现实的意义。针对防治高抽巷抽采条件下采空区煤炭自燃,本文从以下四个方面进行研究：首先通过采集刘庄矿13煤层三组煤样并进行低温氧化实验,根据实验结果优选出13煤自燃早期预测预报的指标气体,并结合指标气体浓度与温度的函数关系建立了多指标气体预测煤炭自燃体系。通过理论分析采空区上覆围岩的特性,分析了采空区孔隙率、渗透率在采空区的分布情况。利用Fluent流体模拟软件,建立了高抽巷抽采条件下采空区气体渗流模型,结合漏风强度划分出该条件下采空区自燃“三带”的范围。并分析了高抽巷抽采前后及高抽巷不同层位高度条件下,采空区自燃“三带”范围的变化。通过在刘庄矿151305综采面进、回风巷预埋束管和热电偶,实测出采空区测点氧气浓度和测点温度,根据氧气浓度和温度划分出采空区自燃“三带”的范围,结合数值模拟的结果,采用MIN-MAX方法优化了采空区自燃“三带”范围并推算出了极限推进速度。最后根据研究结果结合151305综采面的特殊性提出了高抽巷抽采条件下综采工作面煤炭自燃防治技术。该论文的研究对高抽巷抽采条件下采空区遗煤自燃综合防治有一定的指导意义。
[Abstract]:Fire and gas are two major disasters that restrict the safety and high efficiency development of coal mine. At present, many mines use high drainage roadway gas drainage method to control gas exceeding limit. This method not only has great influence on the air leakage field in goaf, but also increases the probability of spontaneous combustion of coal. Therefore, it can prevent the spontaneous combustion of coal in goaf under the condition of high extraction roadway, and avoid the occurrence of fire accident. Have important and realistic significance. In order to prevent coal spontaneous combustion in goaf under the condition of high pumping roadway extraction, this paper studies the following four aspects:. Firstly, by collecting three groups of coal samples from No. 13 coal seam in Liuzhuang Coal Mine and conducting low temperature oxidation experiments, the index gas for early prediction of spontaneous combustion of coal No. 13 is selected according to the experimental results. Combined with the function relationship between the concentration of index gas and temperature, the multi-index gas prediction system of coal spontaneous combustion is established. Based on the theoretical analysis of the characteristics of overlying surrounding rock in goaf, the distribution of porosity and permeability in goaf is analyzed. By using Fluent fluid simulation software, the gas seepage model of goaf under the condition of high extraction roadway extraction is established. Combined with the wind leakage intensity, the range of "three zones" of spontaneous combustion in goaf under this condition is divided, and the variation of "three zones" of spontaneous combustion in goaf is analyzed before and after extraction of high extraction roadway and under different height conditions of high extraction roadway. The oxygen concentration and temperature of goaf are measured in the 151305 fully mechanized coal face of Liuzhuang Mine, and the range of "three zones" of spontaneous combustion in goaf is divided according to the oxygen concentration and temperature. Combined with the results of numerical simulation, the range of "three zones" of spontaneous combustion in goaf was optimized by MIN-MAX method and the limit propulsion speed was calculated. Finally, according to the research results combined with the particularity of 151305 fully mechanized coal face, the prevention and control technology of coal spontaneous combustion in fully mechanized mining face under the condition of high extraction roadway extraction is put forward. This paper studies the comprehensive prevention and control of spontaneous combustion of coal left in goaf under the condition of high extraction roadway extraction. It has certain guiding significance.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD752.2

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