寺家庄煤矿综采工作面瓦斯抽排技术研究

发布时间：2018-05-05 08:45

本文选题：瓦斯综合治理 + 瓦斯抽采　；参考：《太原理工大学》2013年硕士论文

【摘要】：近年来,随着对煤炭资源的整合,国家加大了对煤矿安全生产的重视程度,颁布了一系列相关的法律、法规和规章制度。因此在煤炭产量逐步提升的同时,煤矿事故数量呈现逐年下降、安全生产局面得到进一步好转的态势。但统计近十年来发生的重特大事故数据可以看出,“瓦斯”仍然是威胁矿工生命安全、影响矿井高产高效生产的最主要因素。并且随着矿井开采向煤层深部延伸,瓦斯涌出量增大,“瓦斯治理”成为多数矿井尤其是高瓦斯矿井亟需解决的主要问题。本文在分析了多孔介质中流体运动形态的基础上研究了瓦斯在综采工作面的运移特征,在充分认识瓦斯灾害的基础上总结了不同的防治措施。并以高瓦斯矿井——阳泉寺家庄煤矿15#煤层15108工作面的生产条件为背景,分别从瓦斯抽放和风排瓦斯两个方面进行研究,寻找解决瓦斯问题的综合防治措施。通过煤层瓦斯压力、煤层透气性系数、瓦斯含量等基础参数,预测该井田瓦斯相对涌出量为21.31m3/t,绝对瓦斯涌出量为197.29m3/min,属高瓦斯矿井,估算出该矿井的瓦斯储量。进而从通风能力、瓦斯涌出现状等多方面进行了瓦斯抽采必要性与可行性研究。根据该矿井的瓦斯涌出情况,提出回采工作面采前预抽、边采边抽与高抽巷抽放邻近层卸压瓦斯的综合瓦斯抽采方法。经过实际抽采效果观测,工作面瓦斯抽采总量平均为105.56m3/min,抽采率达到了80%以上,其中高抽巷抽采量平均保持在97m3/min左右,抽放浓度稳定在37%左右,抽采效果稳定。该工作面在15#煤层顶板上方2.5m处布置一条瓦斯内错尾巷,形成“U+I型通风系统”。通过对该通风方式下的风排瓦斯效果分析,可看出内错尾巷平均排瓦斯量为11.43m3/min,风排率为42.41%,且工作面上隅角瓦斯浓度时有超限的情况出现。考虑到受顶板垮落的影响,未能充分发挥其作用,因此运用Fluent软件对其布置高度进行了数值模拟研究。结果表明：适当提高内错尾巷高度能更加有效地解决上隅角瓦斯超限问题,同时降低回风巷瓦斯浓度。本文采用抽采与风排瓦斯相结合的方法,对寺家庄煤矿瓦斯进行了综合治理。不仅改善了矿井的安全生产环境,而且抽采出的瓦斯可作为重要的能源资源得到充分利用。
[Abstract]:In recent years, with the integration of coal resources, the state has increased the importance of coal production safety, issued a series of relevant laws, regulations and rules. Therefore, the number of coal mine accidents is decreasing year by year, and the situation of safe production is getting better. However, according to the statistics of serious and serious accidents in recent ten years, "gas" is still the most important factor that threatens the lives of miners and affects the production of high production and high efficiency in coal mines. With the coal mine mining extending into the deep coal seam, the amount of gas emission increases, "gas control" has become the main problem that most mines, especially the high gas mine, need to solve. Based on the analysis of fluid movement in porous medium, the characteristics of gas migration in fully mechanized coal mining face are studied in this paper, and different prevention measures are summarized on the basis of fully understanding of gas disaster. Based on the production conditions of 15108 coal face in No. 15# coal seam of high gas mine-Yangquan Sijiazhuang Coal Mine, this paper studies the gas drainage and gas drainage from two aspects, and looks for the comprehensive prevention measures to solve the gas problem. Based on the basic parameters of coal seam gas pressure, coal seam permeability coefficient and gas content, it is predicted that the relative gas emission of this mine is 21.31 m3 / t, and the absolute gas emission is 197.29 m3 / min, which is a high gas mine, and the gas reserves of this mine are estimated. Furthermore, the necessity and feasibility of gas drainage are studied from ventilation capacity, gas emission status and so on. According to the situation of gas emission in this mine, a comprehensive method of gas extraction is put forward, which is pre-drainage before mining, drainage while mining and high drainage roadway to drain the unpressurized gas from adjacent strata. Through the observation of the actual drainage effect, the average total amount of gas extraction is 105.56 m3 / min, and the extraction rate is more than 80%, in which the average drainage quantity of high drainage roadway is about 97m3/min, the drainage concentration is about 37%, and the extraction effect is stable. In this face, a gas staggered tail roadway is arranged at 2.5 m above the roof of No. 15 coal seam to form "U I ventilation system". Through the analysis of the effect of air drainage in this ventilation mode, it can be seen that the average amount of gas discharged is 11.43 m3 / min, the air discharge rate is 42.41 / min, and the gas concentration in the upper corner of the working face is in excess of the limit when the gas concentration in the upper corner of the working face is exceeded. Considering the influence of roof caving, it can not give full play to its function, so the Fluent software is used to simulate its layout height. The results show that properly raising the height of the inner staggered tail roadway can effectively solve the problem of gas over-limit in the upper corner and reduce the gas concentration in the return air tunnel. In this paper, the comprehensive control of the gas in Sijiazhuang coal mine is carried out by the method of combining drainage with air drainage. It not only improves the safe production environment of mine, but also makes full use of the gas extracted as an important energy resource.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD712.6

【参考文献】