注氮对采空区煤炭自燃“三带”影响的研究

发布时间：2018-05-27 21:30

本文选题：综放工作面采空区 + 注氮防灭火　；参考：《安徽理工大学》2013年硕士论文

【摘要】：煤在自然界的自燃现象是一直客观存在的。矿井火灾伴随的有毒有害气体还将可能引起矿井的瓦斯爆炸,对井下工作人员以及生产设备构成严重的安全威胁。煤体自燃同时会致使煤炭资源的大量浪费,并导致环境恶化,从而带来人员的伤亡和庞大的经济损失,尤其是近些年,随着综合机械化采煤技术的发展,矿井的开采强度不断增强,采空区的范围也随之增大,通风系统也变得更加复杂,致使煤体自燃火灾最能成为影响煤矿生产安全的主要灾害之一。据资料分析,全国重点煤矿与统配煤矿中,自燃火灾的次数占整个矿井火灾总次数的90%以上,其中发生遗煤自燃的采空区火灾占总火灾次数近60%,因此,井下采空区是自燃火灾发生的主要区域。本文以正行煤矿1504工作面综放采空区遗煤量多、遗煤易自燃、冒落高度大以及工作面推进速度慢等因素为背景,对采空区进行了注氮惰化氧化带防灭火措施,建立了注氮防灭火以及束管检测的完整防灭火体系。首先,通过采集14、15煤的煤样,运用热分析实验以及程序升温氧化实验,得出14、15煤在不同水分和粒径条件下的放热量与吸氧量随温度变化的规律,以及14、15煤在低温氧化条件下的气体生成规律,并优选CO与C2H4作为采空区煤体自燃的指标性气体。其次,结合以往的注氮工艺经验,采用上隅角埋管式的注氮工艺,并通过fluent数值模拟,确定了最佳注氮口位置,应将注氮口安设在深入采空区20m的位置,指导了现场注氮以及束管检测系统的建立。接着,运用matlab软件结合数值分析,对采空区注氮前后的各种气体含量做了精确处理,并采用有限的数据反演出注氮前的三带范围,以及：matlab三维成像技术,直观的得出了采空区气体分布规律,确定了三带前后的变化宽度,划分出了采空区危险性区域,最终对注氮效果进行了评价,及时反馈、调整各注氮参数,完善了采空区注氮防灭火系统。
[Abstract]:The spontaneous combustion of coal in nature has always existed objectively. The poisonous and harmful gas associated with mine fire may also cause gas explosion in the mine and pose a serious safety threat to underground workers and production equipment. Spontaneous combustion of coal will also cause a large amount of waste of coal resources, and lead to environmental deterioration, resulting in casualties and huge economic losses, especially in recent years, with the development of comprehensive mechanized coal mining technology, With the increasing mining intensity, the scope of the goaf increases, and the ventilation system becomes more complex, which makes the spontaneous combustion of coal body fire the most important disaster affecting the safety of coal production. According to the analysis of data, the number of spontaneous fire in key coal mines and integrated coal mines in China accounts for more than 90% of the total number of fires in the whole mine, in which the number of fires in the goaf where spontaneous combustion of coal remains accounts for nearly 60% of the total number of fires. Underground goaf is the main area of spontaneous combustion fire. Based on the factors such as the large amount of coal left in the fully mechanized caving goaf of No. 1504 face of Zhenghang Coal Mine, the easy spontaneous combustion of the remaining coal, the large height of the caving and the slow speed of the working face, the measures of preventing and extinguishing the fire in the goaf with nitrogen inert oxidation zone are carried out in this paper. A complete fire extinguishing system with nitrogen injection and beam tube detection was established. First of all, by collecting coal samples of 14Y15 coal, using thermal analysis experiment and temperature programmed oxidation experiment, the variation of heat release and oxygen absorption with temperature under different water and particle size conditions is obtained. The gas formation law of 14Y15 coal under the condition of low temperature oxidation and CO and C2H4 are selected as the index gas of spontaneous combustion of coal body in goaf. Secondly, combined with the previous experience of nitrogen injection process, the upper corner burying tube nitrogen injection process was adopted, and through fluent numerical simulation, the optimum position of nitrogen injection port was determined, and the nitrogen injection port should be located at the position of 20 m deep in the goaf. The establishment of field nitrogen injection and beam tube detection system is guided. Then, by using matlab software and numerical analysis, the gas content before and after nitrogen injection in goaf is treated accurately, and the range of three bands before nitrogen injection is reversed with limited data, and the three-dimensional imaging technology of: MATLAB is used. The distribution law of gas in goaf is obtained intuitively, the width of change before and after three zones is determined, the dangerous area of goaf is divided, the effect of nitrogen injection is evaluated, the feedback is timely, and the parameters of nitrogen injection are adjusted. The system of nitrogen injection and fire extinguishing in goaf has been improved.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD752.2

【参考文献】