基于fluent的采空区瓦斯分布规律研究

摘要AbstractRecent years,with the increase of the depth of coal seams mined,methane gradient increased in a huge speed,causing a large amount ofworking face gas emission .And a large proportion of working face gascomes from gas emission of gob.So only if we get a good knowledge ofthe laws of gas storage,gas movement,gas emission,then we can adjustthe ventilation system reasonably and take effective methane controlmeasures to prevent the gas gathering.This dissertation analysis the basic features of fully Mechanizedmining face,goaf gas migration rules and the main factors which has theeffects on goaf gas emission through theoretical analysis,taking the CH4constituents in goaf gas-air mixed gas as the research object.And the,onthe basis of analysis ,the third chapter 2 established the equations of thegas seepage in gob.The fluid mechanics calculation software FLUENT isused to establish the model of 1123(1)working face of the Guqiaocolliery and simulate two different 3D models of gas distribution in gobof fully mechanized mining face between the model with air leakage onlyand the model with air leakage and high-located gas drainage roadway.The conclusion is high-located gas drainage roadway makes thehigh-concentration gas in the gob deliver to the drainage port,thedistance of the air leakage go deep in the gob is increased too,so theresult is the gas emission from the gob to the workface reduced.Finallythe chapter 4 makes an evaluation about the effects of the methanecontrol according to the simulated results and the field metrical data.The simulated results are identical with the field metrical data,which is proved by this dissertation.So using FLUENT software tosimulate the gas seepage in gob has the fixed guidance meaning tomethane control measures.Key words:goaf,methane seepage flow,FLUENT software,numericalsimulation,methane extraction.安徽建筑大学本科毕业论文