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1、河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文附錄：外文資料與中文翻譯外文資料：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河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文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,
