文档介绍：基于fluent的采空区瓦斯分布规律研究
摘要
近年来随着矿井开采的不断延深,瓦斯梯度也不断增大,进而造成工作面瓦斯涌出量很大,而采空区瓦斯涌出在工作面瓦斯涌出中占有很大的比例,因此只有了解采空区瓦斯的赋存、运移、涌出规律,才能合理地调整采场通风系统,采取行之有效的瓦斯治理措施防止瓦斯集聚。
因此本文以采空区瓦斯、空气混合气体中的瓦斯(CH4)为主要研究对象,通过理论分析的方法较系统分析了综采工作面及其采空区瓦斯运移的基本特征,以及影响采空区瓦斯影响涌出的主要因素,并以此为理论基础建立了采空区瓦斯运移的数值模型。紧接着以顾桥矿1123(1)工作面为原形在FLUENT软件中搭建模型,通过数值模拟对比分析了仅有漏风和布置有高抽巷情况下的采空区内的瓦斯分布规律,得出高抽巷的抽排作用使得综放面采空区内的高浓度瓦斯向抽采,口运移,同时扩大了工作面漏风向采空区内深入的距离,减少了采空区内瓦斯向工作面的涌出。最后,根据数值模拟结果结合现场测量数据对1123(1)工作面的瓦斯抽放效果进行分析评价。
通过本文的分析验证数值模拟与现场实测结果基本吻合,由此可推知采用FLUENT进行数值模拟对采空区瓦斯抽采措施的制定具有一定的指导意义。
关键词:采空区;瓦斯渗流;FLUENT软件;数值模拟;瓦斯抽采。
Abstract
Recent years, with the increase of the depth of coal seams mined, methane gradient increased in a huge speed, causing a large amount of working face gas emission .And a large proportion of working face es from gas emission of gob. So only if we get a good knowledge of the laws of gas storage, gas movement, gas emission, then we can adjust the ventilation system reasonably and take effective methane control measures to prevent the gas gathering.
This dissertation analysis the basic features of fully Mechanized mining face, goaf gas migration rules and the main factors which has the effects on goaf gas emission through theoretical analysis, taking the CH4 constituents in goaf gas-air mixed gas as the research object. And the , on the basis of analysis ,the third chapter 2 established the equations of the gas seepage in gob. The fluid mechanics calculation software FLUENT is used to establish the model of 1123(1) working face of the Guqiao colliery and simulate two different 3D models of gas distribution in gob of fully mechanized mining face between the model with air leakage only and the model with air leakage and high-located gas drainage roadway. The conclusion is high-located gas drainage roadway makes the high-concentration gas in the gob deliver to the drainage port, the distance of the air leakage go deep in the gob is increased too, so the result is the gas emission from the gob to the workface reduced.