5 mine ventilation systems

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1、MineVentilationSystemsIntroductionFansStoppingsandSealsDoorsandairlocksRegulatorsAircrossingsNewWordsandExpressionsOutline通过学习，要求熟记adowncastshaft进风竖井、drift水平巷道、slope斜井、adit平硐、intakeairway进风巷、returnairway回风巷、upcastshaft回风竖井、stopping风墙、seal密闭、stratum地层、spontaneouscombustion自燃、door风门、airlock风闸等专业词汇

2、，达到英文与中文相互熟练翻译的程度；深入理解StoppingsandSeals、Doorsandairlocks等内容，达到熟练阅读和正确、通顺地翻译的程度；了解Regulators、Aircrossings等内容，达到比较熟练和比较通顺翻译的程度。ObjectivesFigure1depictstheessentialelementsofaventilationsysteminanundergroundmineorothersubsurfacefacility.1IntroductionFreshairentersthesystemthroughoneormoredowncastsh

3、afts,drifts(slopes,adits),orotherconnectionstosurface.Theairflowsalongintakeairwaystotheworkingareasorplaceswherethemajorityofpollutantsareaddedtotheair.Theseincludedustandacombinationofmanyotherpotentialhazardsincludingtoxicorflammablegases,heat,humidity,andradiation.Thecontaminatedairpassesbac

4、kthroughthesystemalongreturnairways.Inmostcases,theconcentrationofcontaminantsisnotallowedtoexceedmandatorythresholdlimitsimposedbylawandsafefortheentryofpersonnelintoallpartsoftheventilationsystemincludingreturnairways.Theintakeandreturnairwaysareoftenreferredtosimplyasintakesandreturnsrespecti

5、vely.Thereturnaireventuallypassesbacktothesurfaceviaoneormoreupcastshafts,orthroughinclinedorleveldrifts.新鲜空气通过一个或多个进风竖井、巷道（斜井、平硐）或其他与地面相连的线路进入系统中。空气流经进风巷道，到达工作区域或地点，那里大部分污染物混入到风流当中。这些污染物包括粉尘和许多其他具有潜在危险的物质组成的混合物（包括有毒或可燃气体、热、湿气和辐射）。污浊风流沿着回风巷道流经系统。大多数情况下，污染物的浓度不允许超过法规规定的强制性的极限范围，对包括回风在内的通风系统各部分的人员

6、来说是安全的。进风巷道和回风巷道通常被简化为进风和回风。回风通过一个或多个回风竖井、倾斜或水平巷道排出到地面。1IntroductionTheprimarymeansofproducingandcontrollingtheairflowarealsoillustratedonFigure1.Mainfans,eithersinglyorincombination,handlealloftheairthatpassesthroughtheentiresystem.Theseareusually,butnotnecessarily,locatedonsurface,eitherexhaus

7、tingairthroughthesystemasshownonFigure1or,alternatively,connectedtodowncastshaftsormainintakesandforcingairintoandthroughthesystem.Becauseoftheadditionalhazardsofgasesanddustthatmaybothbeexplosive,legislationgoverningthevent