不同温度条件下煤粒瓦斯解吸机理及其应用研究

发布时间：2018-06-07 22:55

  本文选题：煤层气 + 吸附　； 参考：《太原科技大学》2015年硕士论文

【摘要】：随着我国煤层开采深度的增加,煤层温度变化明显,温度对煤层瓦斯赋存的影响不容忽视,研究温度与煤层瓦斯解吸的关系对煤层瓦斯的抽采具有重要意义。目前,煤层瓦斯含量测定中很少将温度作为影响煤体瓦斯含量的重要指标。本文采用理论分析、实验测量、现场测试的研究方法,对不同温度环境下煤体瓦斯的解吸量进行了研究,得出了受温度影响的瓦斯含量计算方程,在对实验矿区煤样的测定中,确定了受温度影响的瓦斯吸附解吸方程的吸附常数。进行现场工业试验,提出了具有针对性的瓦斯抽采方案,瓦斯抽采率提高了5%。本文研究结论如下:(1)通过对煤体瓦斯吸附与解吸的特性理论研究分析,得出煤体瓦斯在不同温度环境下,吸附常数b值与温度有关,吸附常数a值与煤体的比表面积有关。进一步研究发现温度对a值的影响符合指数函数关系,考虑瓦斯不同的赋存条件引入参数?。结合气体状态方程与朗格缪尔方程,得出与受温度变化影响的煤层瓦斯含量方程。(2)实验选取李雅庄矿2#煤作为煤样,应用WY98-A型瓦斯吸附解吸仪器,分别采用不同温度(20℃—45℃)、不同压力的两种CH4注气方式进行吸附实验测定,研究得出:朗格缪尔吸附常数a值与温度的函数关系以及b值与温度的函数关系,由此确定出参数α值的大小,完善了理论中关于温度变化下的煤层瓦斯含量方程。(3)通过对李雅庄矿煤层温度进行测量,得到温度与煤层深度之间的函数关系式,针对2602回采工作面煤层瓦斯含量的计算,比较了温度对煤层瓦斯含量的影响结果,分析了以往瓦斯抽采效果不理想的原因。结合2602回采工作面煤体瓦斯含量的来源分析后,采取了在本煤层和邻近层瓦斯抽采技术与顶板钻孔和高位钻场底板高位裂隙钻孔的瓦斯联合抽采方式,并确定出预计抽采时间。经过现场工业试验,历时14个月的抽采效果检验,煤层瓦斯的抽采量达到45%以上,基本保障了煤层开采的安全性与可靠性。为煤层瓦斯在抽采设计与利用温度对煤层瓦斯含量的判断提了理论和实践保障。
[Abstract]:With the increase of coal seam mining depth in China, the change of coal seam temperature is obvious, and the influence of temperature on the occurrence of coal seam gas can not be ignored. It is of great significance to study the relationship between temperature and coal seam gas desorption. At present, the temperature is seldom regarded as the important index to influence the coal gas content in the coal seam gas content measurement. In this paper, theoretical analysis, experimental measurement and field test are used to study the desorption amount of coal gas under different temperature conditions, and the calculation equation of gas content affected by temperature is obtained, which is used in the determination of coal sample in experimental mining area. The adsorption constants of gas adsorption and desorption equation affected by temperature were determined. The field industrial test was carried out, and the specific gas drainage scheme was put forward, and the gas drainage rate was increased by 5%. The conclusion of this paper is as follows: (1) through the theoretical study and analysis of the adsorption and desorption characteristics of coal gas, it is concluded that the adsorption constant b is related to temperature and the adsorption constant a is related to the specific surface area of coal under different temperature conditions. It is found that the effect of temperature on a value is in accordance with the exponential function relationship, and the parameters are introduced into consideration of different gas occurrence conditions. Combined with the gas state equation and Langmuir equation, the gas content equation of coal seam affected by temperature change was obtained. The coal of Liyazhuang Mine was selected as coal sample in the experiment, and WY98-A gas adsorption and desorption instrument was used. The adsorption experiments were carried out by two different gas injection modes of Ch _ 4 at different temperatures (20 鈩，

本文编号：1993154