【作者】 李霞；

【导师】 赵耀江；

【作者基本信息】 太原理工大学 ， 安全技术及工程， 2010， 硕士

【摘要】 经理论分析、计算模拟参数,通过计算机模拟和相似材料实验分别研究基础的U型通风、“一进两回”Y型、“一进两回”U+L型、“一进两回”U+G型即U型加上采空区裂隙带高位瓦斯回风巷(常说的高位瓦斯抽放巷道)采空区的瓦斯浓度分布、瓦斯运移规律。通过理论分析并联系实际,以沙曲矿14205综采面采空区数据,描述了采空区形态,计算对比确定了采空区“竖三带”的高度和“横三区”的长度;分析采空区瓦斯涌出的影响因素,并对各部分的瓦斯涌出进行了预测;由采空区多孔非均匀各向异性介质,研究了瓦斯的运移的机理,并研究计算瓦斯在此介质中运移时决定的因素:瓦斯各部分的涌出源、孔隙率、粘性阻力系数,确定了瓦斯和风流流动的微分方程。建立综采面瓦斯运移的几何模拟图和模拟参数表,使模拟更接近实际引入工作面瓦斯涌出数据,对U型通风、“一进两回”Y型、“一进两回”U+L型、“一进两回”U+G型即U型加上采空区裂隙带高位瓦斯回风巷道时采空区瓦斯运移用FLUENT进行数值模拟,得到不同的能较真实反应实际流动状态的瓦斯浓度、瓦斯运移图,并通过图中各方向瓦斯浓度数据的导出及整理作表,更进一步说明分析说明“一进两回”工作面通风系统采空区瓦斯浓度分布及运移规律。对数值模拟的各通风系统做相似材料实验,用各色烟雾弹放出的气体作为示踪气体实验并拍下气体流动过程图,并与计算机模拟效果图相比,结合实践,结论基本一致。本文所做的以上工作,使对常见的“一进两回”巷道布置的通风系统下采空区瓦斯流动有了更具体的认识,在实际生产中有一定的应用参考价值。更多还原

【Abstract】 This paper has studied gob gas concentration, gas migration law based on U-ventilation, "one intakes two reture" Y-type, "one intakes two reture" U + L-type, "one intakes two reture" U + G model that is U and gob fracture zone with high gas return airway (often talk about high gas drainage tunnel), after theoretical analysis, computer simulation parameters, and computer simulation and similar experiments.Through theoretical analysis and practice, as Shaqu 14205 mechanized mining Gob of data, described the form of mined-out area, determined mined-out area "vertical three-zone" height and "horizontal three-zone" length; described the Gas Emission Factors of the fully mechanized mining face and Gob , and carried out various parts of the prediction of gas emission; from mined-out area of non-homogeneous anisotropic porous media to study the mechanism of gas migration,studied the decisive factor of gas transport in this medium: Gas pouring the various parts of the source, porosity, viscous drag coefficient to determine the flow of gas and airflow differential equations.Established a fully mechanized coal mining face of the geometric simulation of gas transport maps and simulation parameter table, in order to simulate realistic and boldly, it simulated using FLUENT for U-ventilation, "one intakes two reture" Y-type, "one intakes two reture" U + L-type, "one intakes two reture" U + G model that is U and gob fracture zone with high gas return airway (often talk about high gas drainage tunnel), got different than the real response to the actual state of the gas concentration flow、gas migration law chart and graph in all directions through the gas concentration data for export and sorting table, more specific shows the "one intakes two reture" face ventilation systems that gas concentration distribution and migration law.Through the similar material experiments about the numerical simulation of the ventilation systems, using colored smoke bomb which released the gas as a tracer gas to conduct the experiment and photographed the gas flow diagrams, compared the computer simulation of the map and the actual experiments, found the conclusions are basically the same.This more than done, we had a more specific understanding of "one intakes two reture" face ventilation systems gob gas flow, and had a certain reference value In actual production.更多还原