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1、河南理工大学万方科技学院本科毕业论文附录：外文资料与中文翻译外文资料：MinesafetyCoalmininghistoricallyhasbeenahazardousoccupationbut,inrecentyears,tremendousprogresshasbeenmadeinreducingaccidentalcoalminedeathsandinjuries.themainaspectisasfollowing：⑴Safetyofmineventilation•PurposesofMin
2、eVentilation•Properlyengineeredcontrolofthemineatmosphereisrequiredto:•providefreshair(oxygen)formentobreathe•provideasourceofoxygenforinternalcombustionenginesinmachinery•diluteatmosphericcontaminantstoacceptablelevels•maintaintemperatureandhumiditywi
3、thinacceptablelimits•removeatmosphericcontaminantsfromthemine.Mineventilationistwofoldinpurpose:first,itmaintainslife,andsecondlyitcarriesoffdangerousgases.Thehistoricroleofventilationwastoprovideaflowoffreshairsufficienttoreplacetheoxygenconsumedbythe
4、minersworkingunderground.Today'smineventilationprimarilydealswithnoxiousgases(mainlygeneratedbytracklessequipmentunderground).Canariesaresaidtohavebeenusedtodetectgasincoalminesintheearlystagesofcoalmining.Thissensitivebirdwouldbetakenintotheworkingsan
5、d,ifitperished,thecollierswouldimmediatelyleavethemine.Inthe1920sthehand-turnedfanswerereplacedwithair-poweredsmallturbinefans.20河南理工大学万方科技学院本科毕业论文Largefansofthesuctiontypewereplacedonthesurfaceandgraduallyincreasedinsize.Airfromsurfacecompressorswaspi
6、pedintotheminetopowermachineryandtoassistinventilation.Unlesstheairisproperlydistributedtotheface,themineventilationsystemisnotperformingitsprimaryfunction[1].Whileithasalwaysbeenrecognizedthatthislastpartofventilationisthemostimport,itisalsothemostdif
7、ficulttoachieve.Figure1.TypicalelementsofamainventilationsystemTheprimarymeansofproducingandcontrollingtheairflowarealsoillustratedonFigure1.Mainfans,eithersinglyorincombination,handlealloftheairthatpassesthroughtheentiresystem.Theseareusually,butnotne
8、cessarily,locatedonsurface,eitherexhaustingairthroughthesystemasshownonFigure1or,alternatively,connectedtodowncastshaftsormainintakesandforcingairintoandthroughthesystem.Becauseoftheadditionalhazardsofgasesanddustthatmaybothbeexplosive,
