布尔台矿综放工作面采空区瓦斯运移 规律及瓦斯抽采优化研究
Research on gas migration law and gas drainage parameters optimization in goaf of fully mechanized caving face in Buertai Coal Mine
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摘要: 采空区涌出瓦斯是采煤工作面瓦斯重要来源之一,合理的采空区抽采方案可有效解决工 作面瓦斯超限问题。 本文结合数值模拟与现场应用对神东布尔台矿42 号上煤层综放工作面采 空区瓦斯插管抽采系统进行优化。 首先,利用流体模拟软件FLUENT模拟采场瓦斯运移特征,考 虑了采空区遗煤解吸和上邻近层的瓦斯涌出,揭示了采空区瓦斯浓度分布规律,并分析了抽放口 与回风隅角距离、抽采负压和不同配风比对抽采效果的影响,提出抽采优化方案。 然后,将优化 方案进行现场应用,重点考察了抽放口与回风隅角距离和抽采负压,得出当插管间距为70m、抽 采负压为12~18kPa时,抽采效果较好。 研究结果对高产高效低瓦斯矿井采空区瓦斯抽采方案 优化具有理论和现实意义。Abstract: Gasemissionfromthegoafisoneoftheimportantsourcesofgasintheworkingfaceanda reasonable goaf drainage scheme can effectively solve the problem of gas overrun in working face.Combinedwithnumericalsimulationandfieldapplication,thegasintubationextractionsystemin thegobofthefullymechanizedcavingfacein42-topcoalseamofBuertaiCoalMineisoptimizedin thispaper.Firstly,theFLUENTfluidsimulationsoftwareisutilizedtosimulatethecharacteristicsofgas migrationinthestope,consideringthedesorptionoftheremainingcoalinthegoafandthegasemission fromtheupperadjacentlayer.Thedistributionlawsofgasconcentrationinthegoafarerevealed,and theinfluenceofthedistancebetweentheextractionoutletandtheair-returncorner,drainagenegative pressureandairsupplyratioontheextractioneffectareanalyzed,theoptimizedschemeofextractionis proposedaccordingly.Thentheoptimizationschemeisappliedonthespot,focusingonthedistancebetweentheextractionoutletandtheair-returncornerandnegativepressure.Itisconcludedthatwhenthe intubationdistanceis70mandnegativepressureis12~18kPa,theextractioneffectisbetter.Theresearchresultshavetheoreticalandpracticalsignificancefortheoptimizationofgasdrainageschemein goafofhighyield,highefficiencyandlowgasmines.
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