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首页> 外文会议>2015 SME annual meeting amp; expo and CMA 117th national western mining conference: Mining: Navigating the global waters >CFD STUDY OF FACE VENTILATION EFFECT ON TAILGATE METHANE CONCENTRATION AND EXPLOSIVE MIXTURE OF GOB IN UNDERGROUND LONGWALL COAL MINING
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CFD STUDY OF FACE VENTILATION EFFECT ON TAILGATE METHANE CONCENTRATION AND EXPLOSIVE MIXTURE OF GOB IN UNDERGROUND LONGWALL COAL MINING

机译：地下通风采煤中端面通风对尾矿中甲烷浓度和炸药混合物的CFD研究

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The main purpose of mine ventilation design is to provide sufficient quantity and quality of air to the workers and to dilute methane and other contaminants. It is generally perceived that the additional air along the longwall face will improve methane dilution on the face and in the tailgate. However, computational fluid dynamics (CFD) modeling efforts at the Colorado School of Mines (CSM) under a National Institute for Occupational Safety and Health (NIOSH) funded research project have found that higher flow velocities along the longwall face are shown to increase the pressure differential between the gob and longwall face allowing more methane to be entrained in the active face and tailgate (TG) area, thereby negating the dilution effect. The increased face ventilation causes an increase in pressure along the headgate side which allows more oxygen to ingress into the gob area, thereby increasing the amount of oxygen available to form explosive methane air mixtures in the gob and to support spontaneous combustion of the coal. Two things are happening at two different locations along the longwall face, increase in pressure as the flow enters the active area cause an increase in pressure which forces more oxygen into the gob, but as the flow is developed along the longwall face, the higher velocities causes greater pressure drop allowing methane to enter the active face further downstream from the headgate (HG) towards the tailgate side. In this paper, a parametric study will be presented to discuss the effect that varying the face air quantity has on methane concentrations in the tailgate and formation of explosive gas zones (EGZs) in the gob. Counter to conventional wisdom, it appears that increased longwall face air quantities may increase the explosion hazard as they result in increased EGZ volumes in the gob, along with increased methane quantities in the tailgate return.
机译：矿井通风设计的主要目的是为工人提供足够数量和质量的空气，并稀释甲烷和其他污染物。通常认为，沿长壁面的额外空气将改善面和后挡板中的甲烷稀释度。但是，在美国国家职业安全与健康研究所（NIOSH）资助下的科罗拉多矿业学院（CSM）进行的计算流体动力学（CFD）建模工作中，发现沿长壁面的较高流速会增加压力料滴和长壁工作面之间的差异，使更多的甲烷被夹带在工作面和后挡板（TG）区域，从而抵消了稀释效果。不断增加的工作面通风导致沿闸门侧的压力增加，这使更多的氧气进入采空区，从而增加了可用于在采空区中形成爆炸性甲烷空气混合物并支持煤自燃的氧气量。沿长壁面的两个不同位置发生了两件事，当流体进入活动区域时，压力增加，导致压力增加，这迫使更多的氧气进入料滴，但是当流体沿长壁面发展时，速度越高会导致更大的压降，使甲烷从顶门（HG）朝尾门侧更下游地进入工作面。在本文中，将进行参数研究，以讨论改变面部空气量对后挡板中甲烷浓度和料滴中爆炸性气体区域（EGZs）形成的影响。与传统观点相反，长壁工作面的空气量增加可能会增加爆炸危险，因为它们会导致料滴中的EGZ量增加，以及后挡板返回处的甲烷量增加。

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