环境工程专业英语全套教学课件

ProfessionalEnglishforEnvironmentalEngineering全套可编辑PPT课件

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IntroductiontoEnvironmentalEngineeringAirPollutionandControlWaterPollutionandControlSolidWasteandDisposalEnvironmentalImpactAssessmentEnvironmentalLaws，RegulationsandSustainableDevelopmentProfessionalEnglishforEnvironmentalEngineering

IntroductiontoEnvironmentalEngineering

WhatisEnvironmentalEngineering

ContentsImportantConcepts

Environmentalengineeringistheintegrationofsciencesandengineeringprinciplestoimprovethenaturalenvironment,toprovidehealthywater,air,andlandforhumanhabitationandforotherorganisms,andtocleanuppollutionsites.

--abranchofappliedscienceandtechnologythataddressestheissueofenergypreservation,productionassetandcontrolofwastefromhumanandanimalactivities.WhatisEnvironmentalEngineering?--Wastewatermanagement--Airpollutioncontrol--Recycling--Wastedisposal--Radiationprotection--Industrialhygiene--Environmentalsustainability--Publichealthissues--Knowledgeofenvironmentalengineeringlaw--TheenvironmentalimpactRelatedfieldCivilengineering

hydrology,waterresourcesmanagement,bioremediation,andwatertreatmentplantdesign.Chemicalengineeringenvironmentalchemistry,advancedairandwatertreatmenttechnologiesandseparationprocessesWhatisEnvironmentalEngineering?DevelopmentEversincepeoplefirstrecognizedthattheirhealthandwell-beingwererelatedtothequalityoftheirenvironment,theyhaveappliedthoughtfulprinciplestoattempttoimprovethequalityoftheirenvironment.WhatisEnvironmentalEngineering?TheancientHarappancivilizationutilizedearlysewersinsomecities.(B.C.3000)DevelopmentWhatisEnvironmentalEngineering?Romansconstructedaqueductstopreventdroughtandtocreateaclean,healthfulwatersupplyforthemetropolisofRome.(B.C.500)DevelopmentWhatisEnvironmentalEngineering?Inthe15thcentury,Bavaria③createdlawsrestrictingthedevelopmentanddegradationofalpinecountrythatconstitutedtheregion'swatersupply.DevelopmentWhatisEnvironmentalEngineering?TheearliestknowndrainagesysteminChinaappearedinthelateNeolithicage,about4600yearsago.ItisagroupofceramicundergrounddrainagepipesunearthedattheLongshaneracitysiteofpingliangtai,Huaiyang,HenanProvince.(B.C.3000)DevelopmentWhatisEnvironmentalEngineering?AdrainageditchmadeofpebbleswasalsofoundatthesiteofYanguocityinLiuliriver.Itsbottomandsidewallsweremadeofpebbles,anditstopwascoveredwithwood.Thedrainageditchpassesunderthecitywall,andtherainwaterinthecityflowsintothemoatthroughthedrainageditch,andthenintotheDashiriver.ItistheearliestpebbledrainageditchexcavatedinChinaandtheoldestsewerinBeijing.(B.C.1000)DevelopmentWhatisEnvironmentalEngineering?EverytimethereisaheavyrainorrainstorminBeijing,therewillbeadragonspittingwaterlandscapeonthefoundationoftheTaihehallandotherhallsoftheForbiddenCity.Thisphenomenon,whichlookslikeauspicious,willcausecurioustouriststostopandclockinandtakephotos.IntroductionGenerationofEnvironmentalProblemsIndustrialization

Urbanization

PopulationGrowthandEconomicDevelopmentEventhoughthegrowthrateisgraduallyslowing,theworldpopulationin2050couldbe8.9billion.EachpersoncreatesacertaindemandonEarth’sresources,andthatdemandtendstoincreasewithgreateraffluence.Introduction

TheOverviewofGlobalEnvironmentalPollutions

Discussion碳中和（carbonneutrality）碳达峰（emissionpeak）--ScheduleandroadmapforChinatoachievecarbonpeakby2030andcarbonneutralizationby2060.--In2020,thenationalenergyrelatedCO2emissionswereabout11.3billiontons(includingindustrialprocessemissions),andthecorrespondingcarbonemissionsofcoal,oilandnaturalgasaccountedfor66%,16%and6%respectively.Power,steel,cement,transportationandotherkeyemissiondepartments.科技英语的特点（上）词汇：术语句法：长难句&名词化结构&非谓语动词形式&惯用的句型结构&省略结构Itseemsthat…/Itisreportedthat…/Ithasbeenprovedthat…Thefactisthat…/Thetruthisthat…/Ofrecentconcernis…Thismeansthat…/Experimentshowsthat…/Practicehasprovedthat…If…/When…Ifnecessary/Ifpossible/Whenneeded/Wherefeasible/Asnotedlater/AspreviouslymentionedTranslation

Exercise（1）Environmentalengineeringistheintegrationofsciencesandengineeringprinciplestoimprovethenaturalenvironment,toprovidehealthywater,air,andlandforhumanhabitationandforotherorganisms,andtocleanuppollutionsites.（2）Furthermore,itisconcernedwithfindingplausiblesolutionsinthefieldofpublichealth,suchaswaterbornediseases,implementinglawswhichpromoteadequatesanitationinurban,ruralandrecreationalareas.（3）Inmanycases,associetiesgrew,actionsthatwereintendedtoachievebenefitsforthosesocietieshadlonger-termimpactswhichreducedotherenvironmentalqualities.Translation

Exercise（1）DDT在为农业做出巨大贡献时，也为整个生态系统带来了前所未有的灾难。（2）如有可能，环境工程师会不遗余力地恢复功能受损的环境，减少对环境产生威胁的人类活动，因为没有人比他们更了解环境的重要性。Translation

科技英语写作的要求1.准确（accuracy）2.简洁（brevity/conciseness）3.清楚(clarity)Writing

Writing

ExerciseSummarizethereadingmaterialwithnolessthan150words,basedontherequirementsofscientificEnglishwriting.ExpandingReading

JobProspectsofEnvironmentalEngineerDutiesPaymentReviewReadingEnvironmentalEngineeringDevelopmentTranslationWritingThankYou!ProfessionalEnglishforEnvironmentalEngineeringMainContents

IntroductiontoEnvironmentalEngineeringAirPollutionandControlWaterPollutionandControlSolidWasteandDisposalEnvironmentalImpactAssessmentEnvironmentalLaws，RegulationsandSustainableDevelopment

IntroductiontoEnvironmentalEngineering

GlobalEnvironmentalConcern

ProfessionalEnglishforEnvironmentalEngineering

ContentsTreaties,conventions,andprotocols

forthecauseofglobalenvironmentalprotection--RioDeclaration(1992)--TheConventiononBiologicalDiversity(CBD)(1992)--KyotoProtocol(1997)--TheAntarcticTreaty(1991)GlobalEnvironmentalConcern

--Ozonelayerdepletion--

Globalwarming--

LossofbiodiversityOzonelayerdepletionEffectsofOzoneLayerDepletion

EffectsonHumanandAnimalHealthEffectsonTerrestrialPlantsEffectsonAquaticEcosystemsEffectsonBio-geo-chemicalCyclesEffectsonAirQualityOzoneDepletionCounterMeasuresInternationalcooperation,agreement(MontrealProtocol)tophaseoutozonedepletingchemicalssince1974TaximposedforozonedepletingsubstancesRecycleofCFCs

andHalonsGlobalEnvironmentalConcern

GlobalAtmosphericChangesTheMontrealProtocol(1987)—aimedatcurbingpollutionfromthereleaseofchlorofluorocarbon

refrigerants

intotheatmosphere.DepletionofStratosphericOzoneLayerGlobalEnvironmentalConcern

GlobalWarmingSourcesofGreenhouseGases

Naturallyoccurringgreenhousegasesincludewatervapor,carbondioxide,methane,nitrousoxide,andozone.Humanactivities--carbondioxide,methane,nitrousoxide,hydrofluorocarbons(HFCs),perfluorocarbons(PFCs),andsulfurhexafluoride(SF6)GlobalWarming(ClimateChange)ImplicationsRiseinglobaltemperatureRiseinsealevelFoodshortagesandhungerGlobalEnvironmentalConcern

GlobalAtmosphericChangesTheKyotoProtocol(1997)—aimedtoreduceemissionsofcarbondioxideandothergreenhousegases.Atthemeeting,mostoftheindustrializednationsagreestoreduceemissionstobelow1990level,agoalachievedby2010.LossofBiodiversityBiodiversityreferstothevarietyoflifeonearth,anditsbiologicaldiversity--genesinthesespeciesandthedifferentecosystemsontheplanet.Humanactivityischangingbiodiversityandcausingmassiveextinctions.GlobalEnvironmentalConcern

LossofBiodiversityTherapidlygrowinghumanpopulation,togetherwithincreasingconsumption,isacceleratingtheconversionofforest,grasslands,andwetlandstoagricultureandurbandevelopment.TianjinBinhaiNewAreaLeft(1992)

Right(2012)BiomutationbecauseofFukushimanuclearpowerplantleaksLossofBiodiversityPollutionalsodegradeshabitats—particularlyaquaticandmarine

habitats—destroyingthespeciestheysupport.LossofBiodiversityHundredsofspeciesofmammals,reptiles,amphibians）,fish,birds,andbutterflies,aswellasinnumerableplants,areexploitedfortheircommercialvalue.Evenwhenspeciesareprotectedbylaw,theycontinuetobehunted,killed,andmarketedillegally.

DiscussionClimatechangeChangesofoneortwodegreesintheaveragetemperatureoftheplanetcancausepotentiallydangerousshiftsinclimateandweather.DrownedPolarBear科技英语的特点（下）时态：一般现在时、一般过去时、现在完成时和一般将来时被动语态：(>1/3)被动语态的翻译保留源语被动形式，借用汉语的“被”、“为”、“由”、“受到”等词语译出译成主动句译成无主句—语气：陈述语气、祈使语气和虚拟语气—语篇特点：语言规范、语气正式、陈述客观、逻辑性强、高准确性、信息量大、呈现高度专业化并大量使用公式、表格和图表Translation

Exercise（1）Ingeneral,thefastertheclimatechange,thegreaterwillbetheriskofdamage.Themeansealevelisexpectedtorise9-88cmbytheyear2100,causingfloodingoflowlyingareasandotherdamages.（2）Theozonelayer,therefore,ishighlybeneficialtoplantandanimallifeonearthfilteringthedangerouspartofsunsradiationandallowingonlythebeneficialparttoreachearth.Anydisturbanceordepletionofthislayerwouldresultinanincreaseofharmfulradiationreachingtheearth’ssurfaceleadingtodangerousconsequences.Translation

Exercise（1）值得一提的是，在控制全球变暖的合作中，像中国这样的发展中国家一直在尽自己最大的努力，担负起自己的责任。（2）假如地球的平均温度上升2℃，数以亿计的人会流离失所。Translation

科技报告类的书写--实验报告(experiment/labreport)1文头（heading）2简介（introduction）3讨论（discussion）4结论/建议（conclusion/recommendation）Writing

Writing

ExerciseWritealabreportwithnolessthan200words,basedontherequirementsofscientificEnglishWriting.ReviewReadingGlobalEnvironmentalConcernOzonelayerdepletionGlobalwarmingLossofbiodiversityTranslationWritingThankYou!ProfessionalEnglishforEnvironmentalEngineeringMainContents

IntroductiontoEnvironmentalEngineeringAirPollutionandControlWaterPollutionandControlSolidWasteandDisposalEnvironmentalImpactAssessmentEnvironmentalLaws，RegulationsandSustainableDevelopment

AirPollutionandControl

AirPollution,SourceandCharacteristics

ProfessionalEnglishforEnvironmentalEngineering

Primaryairpollutantsareemitteddirectlyfromsources.particulatematter(PM)sulfurdioxide(SO2)nitricoxides(NOx)hydrocarbon(HC)volatileorganiccompounds(VOCs)carbonmonoxide(CO)ammonia(NH3)Secondaryairpollutantsareproducedbythechemicalreactionsoftwoormoreprimarypollutantsorbyreactionswithnormalatmosphericconstituents.groundlevelozoneformaldehydesmogacidmistAirPollution,Source

andCharacteristics

AirpollutantsAirpollutantscompriseprimaryandsecondaryairpollutants.SpraytowerofchemicalfertilizerplantParticulatematterisamixtureofsolidparticlesandliquiddropletssuspendedintheair.Particulatematterisinterchangeablewithaerosol,whichisasuspensionofsolidorliquidparticlesinagas.Itisatwo-phasesystemconsistingofparticlesandthegasinwhichtheyaresuspended.Particulatemattercanbebothprimarypollutantsandsecondarypollutantsthataresentdirectlyintotheatmosphereintheformofwindblowndustandsoil,seasaltspray,pollen,andspores.OtherexamplesofPMaresmoke,fumes,andhaze.AirPollution,Source

andCharacteristics

AirpollutantsParticulatematterForparticulatematterwhereparticlediametersaresmallerthanxmicrometers,itisdefinedasPMx.CommonlyusedtermsarePM10andPM2.5.Sometimes,particulatematterandaerosolisexchangeable.Monodisperseaerosols,inwhichallparticleshavethesamesize,canbeproducedinlaboratoryforuseastestaerosols.Inpractice,engineersdealwithpolydisperseaerosols(i.e.suspendedparticlesareinawiderangeofsizes),andstatisticalmeasuresshouldbeusedtocharacterizeparticlesizes.AirPollution,Source

andCharacteristics

AirpollutantsParticulatematterHeavysmoghitsBeijingin2015Particulatematter(PM)AirpollutantsotherthanPMpresentprimarilyasgases.Volatileorganiccompounds(VOCs)arechemicalsthatcontaincarbonand/orhydrogenandevaporateeasily.VOCsarethemainairemissionsfromtheoilandgasindustry,aswellasindoorconsumerproductsandconstructionmaterials,suchasnewfabrics,wood,andpaints.VOCshavebeenfoundtobeamajorcontributingfactortoground-levelozone,acommonairpollutant,andaprovenpublichealthhazard.AirPollution,Source

andCharacteristics

AirpollutantsVolatileorganiccompoundsHydrocarbon(HC)Volatileorganiccompounds(VOCs)Carbonmonoxide(CO)Sulfurdioxide(SO2)andnitricoxides(NOx)aretwomajorgaseousairpollutantsgeneratedthroughcombustionprocesses.Carbonmonoxide(CO)andhydrocarbon(HC)aregeneratedfromincompletecombustionandareconvertedintoCO2throughacompletecombustionprocess.AirPollution,Source

andCharacteristics

AirpollutantsOthergasesSulfurdioxide(SO2)Nitricoxides(NOx)Acidmist→(H2SO4)→(HNO3)Secondaryairpollutantsarethoseformedthroughcomplexphysicaland/orchemicalreactions.Airpollutionisanevolvingsubjectandinevitable,asthedemandforenergyincreases.AirpollutionreallyflourishedwiththeIndustrialRevolutionandcontinuestogrowwiththehumanappetiteforcomfortandspeed.AirPollution,Source

andCharacteristics

AirpollutantsSecondaryairpollutantsSecondaryairpollutantsarethoseformedthroughcomplexphysicaland/orchemicalreactions.Airpollutionisanevolvingsubjectandinevitable,asthedemandforenergyincreases.AirpollutionreallyflourishedwiththeIndustrialRevolutionandcontinuestogrowwiththehumanappetiteforcomfortandspeed.AirPollution,Source

andCharacteristics

AirpollutantsSecondaryairpollutantsAtfirst,thestudyofairpollutionfocusedonrecurringepisodesofhighlevelsofairpollutioninareassurroundingindustrialfacilities,suchascoalburningpowerplantsandchemicalrefineries.Thesepollutionepisodeswereaccompaniedbyacutehumansicknessandtheexacerbationofchronicillness.Afterthemid-twentiethcentury,whenindustrializednations’economiesrecoveredrapidlyfromWorldWarII,manyurbanregionswithoutheavyindustrialfacilitiesalsobegantoexperiencehighlevelsofphotochemicalsmogandnitrogenoxides.AirPollution,Source

andCharacteristics

AirpollutantsHistoryofairpollutionThephotochemicalsmogincidentinLosAngeles,USA,isoneoftheworld-famouspublichazardevents,whichoccurredinLosAngeles,USAfrom1940to1960.Thetwentiethcenturymarkedthebeginningoftheunderstandingthathumanactivitywashavingdeleteriouseffectsuponthenaturalworld,includinghumanhealthandwelfare.Theseeffectsincludedincreasingpollutionofair,water,andlandbythebyproductsofindustrialactivity,andthepermanentlossofnaturalspeciesofplantsandanimalsthroughchangesinlaboratorysettings,waterusage,andhumanpredations.AirPollution,Source

andCharacteristics

AirpollutantsHistoryofairpollutionThetopicofindoorairquality(IAQ)hasbecomepopular,duetotheawarenessofasthmaandallergiestriggeredbyindoorairpollutantssuchasmold.IAQawarenessalsoincreasedwiththeinvolvementoftheUnitedStatesEnvironmentalProtectionAgency.Theenergycrisisinthe1970sresultedintighterbuildingenvelope,sealing,andinsufficientventilation.Mostexistingheating,ventilation,andairconditioning(HVAC)systemsweredesignedfortemperaturecontrolwithoutconsiderationofairpollutantaccumulations.AirPollution,Source

andCharacteristics

AirpollutantsIndoorairquality(IAQ)Recentfindingshavedemonstratedthatindoorairisoftenmorepollutedthanoutdoorairinmanydevelopedcountries,therebycausingagreaterhealthconcernascurrentlifestylesdemandmoretimeindoors.Thelatertwentiethandearlytwenty-firstcenturiessawaboominnanotechnology.Nanotechnologyhasbeentestedforairqualityremediationinsuchareasasnoncatalyticcombustionandphotocatalyticoxidationofvolatileorganiccompounds(VOCs).AirPollution,Source

andCharacteristics

AirpollutantsIndoorairquality(IAQ)Ontheotherhand,theenvironmentaleffectsofnanotechnologyarenotwellunderstood;and,concernshaverecentlybeguntoincrease.Theworldisnotreadyfornanotechnologybecause“thefutureiscomingsoonerthanitisexpected”.Theeffectofnanotechnologytoairqualityisstillwaitingforsystematicstudiestoconfirmitsenvironmentaleffects.AirPollution,Source

andCharacteristics

AirpollutantsIndoorairquality(IAQ)英语翻译的标准忠实

形式的忠实与内容的忠实通顺

表达要按语的语法和习惯来选词造句，没有文理不通、结构混乱、逻辑不清的现象规范译文必须要符合科技英语的表达规范，即专业、规范Translation

Exercise

Thelatertwentiethandearlytwenty-firstcenturiessawaboominnanotechnology.Nanotechnologyhasbeentestedforairqualityremediationinsuchareasasnoncatalyticcombustionandphotocatalyticoxidationofvolatileorganiccompounds(VOCs).Ontheotherhand,theenvironmentaleffectsofnanotechnologyarenotwellunderstood;and,concernshaverecentlybeguntoincrease.Theworldisnotreadyfornanotechnologybecause“thefutureiscomingsoonerthanitisexpected”.Theeffectofnanotechnologytoairqualityisstillwaitingforsystematicstudiestoconfirmitsenvironmentaleffects.Scientificevidenceisneededbeforedefinitiveconclusionscanbemade.Translation

Exercise（1）值得一提的是，在控制全球变暖的合作中，像中国这样的发展中国家一直在尽自己最大的努力，担负起自己的责任。（2）假如地球的平均温度上升2℃，数以亿计的人会流离失所。Translation

学术论文的撰写（一）一、语言上的特点1.用词规范2.表达完整、严谨二、结构上的特点有固定的格式Writing

Writing

ExerciseDrawatreediagramofthestructuralcharacteristicsofoneacademicpaperpublishedinjournalofenvironmentalprotectionfield.ReviewReadingAirPollution,SourceandCharacteristicsAirpollutantHistoryofAirpollutionTranslationWritingThankYou!ProfessionalEnglishforEnvironmentalEngineeringMainContents

IntroductiontoEnvironmentalEngineeringAirPollutionandControlWaterPollutionandControlSolidWasteandDisposalEnvironmentalImpactAssessmentEnvironmentalLaws，RegulationsandSustainableDevelopment

AirPollutionandControl

AirPollutionEmissionControlDevicesforStationary

ProfessionalEnglishforEnvironmentalEngineering

StationarysourcespowerplantssteelmillssmelterscementplantsrefineriesotherindustrialprocessesContaminantsparticulatesaerosolsvaporsgasesAirPollutionEmissionControlDevicesforStationaryStationarysourcesofairpollutionemission

CommonmethodsforeliminatingorreducinggaseouspollutantsDestroyingpollutantsbythermalorcatalyticcombustionChangingpollutantstolessharmfulformsthroughchemicalreactionsCollectingpollutantsusingairpollutioncontrolsystemsbeforetheyreachtheatmosphereAirPollutionEmissionControlDevicesforStationaryAirpollutioncontroldevices

Electrostaticprecipitators(wetanddrytypes)Fabricfilters(alsocalledbaghouses)WetscrubbersCyclones(ormulticlones)AirPollutionEmissionControlDevicesforStationary

ThemostcommonlyuseddevicesforcontrollingparticulateemissionsThermaloxidizersCatalyticreactorsCarbonadsorbersAbsorptiontowersBiofiltersAirPollutionEmissionControlDevicesforStationaryCommoncontroldevicesforgaseousandvaporpollutantsScrubbingScrubbingisaphysicalprocesswherebyparticulates,vapors,andgasesarecontrolledbyeitherpassingagasstreamthroughaliquidsolutionorsprayingaliquidintoagasstream.Wateristhemostcommonlyusedabsorbentliquid.Asthegasstreamcontactstheliquid,theliquidabsorbsthepollutants,inmuchthesamewaythatraindropletswashawaystrongodorsonhotsummerdaysAirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

WetScrubbingEquipment

GasabsorptionGasabsorptioniscommonlyusedtorecoverproductsortopurifygasstreamsthathavehighconcentrationsofwater-solublecompounds.Absorptionequipmentisdesignedtogetasmuchmixingbetweenthegasandliquidaspossible.Commontypesofgasabsorptionequipmentincludespraytowers,packedtowers,traytowers,andspraychambers.AirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

GasabsorptionPackedtowersarebyfarthemostcommonlyusedcontrolequipmentfortheabsorptionofgaseouspollutants.However,whenusedwithheavy,particulate-ladengas,theycanbepluggedbyparticulatematter(PM).WetcollectiondevicesusedforPMcontrolincludeventuriscrubbers,bubblingscrubbers,spraytowers,andinsomeinstances,wetelectrostaticprecipitators(ESPs).AirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

PackedtowersAdsorptionTheprocessofadsorptioninvolvesthemolecularattractionofgasesorvapors[usuallyvolatileorganiccompounds(VOCs)]ontothesurfaceofcertainsolids(usuallycarbon,molecularsieves,and/orcatalysts).Thisattractionmaybechemicalorphysicalinnatureandispredominantlyasurfaceeffect.AirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

AdsorptionActivatedcarbon(charcoal),whichpossessesthelargeinternalsurfaceareaneededtoadsorblargequantitiesofgaseswithinitsstructure,isoftenusedtoremoveVOCsfromfluegases.AftertheactivatedcarbonissaturatedwithVOCs,itisoftentreated(byheatand/orsteam)tostripoffthecollectedVOCs.TheVOCsarethensentforfurthertreatment,andthecarbonisreusedintheadsorptionreactor.AirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

AdsorptionAdsorptionisaffectedbythetemperature,flowrate,concentration,andmolecularstructureofthegas.Adsorptioniscommonlyusedforremovinggasesfromcontaminatedsoil,oilrefineries,municipalwastewatertreatmentplants,industrialpaintshops,andsteelmills.AirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

AdsorptionTowerFabricFiltersorBagHousesFabricfilters,alsocommonlyreferredtoasbaghouses,areusedinmanyindustrialapplications.Theyoperateinamannersimilartoahouseholdvacuumcleaner.Dust-ladengasespassthroughfabricbagswherethedryparticulatesarecapturedonthefabricsurface.Afterenoughdusthasbuiltuponthefilters,asindicatedbyabuildupinpressureacrossthefabric,dustisperiodicallyremovedbyblowingairbackthroughthefabric,pulsingthefabricwithablastofair,orshakingthefabric.AirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

FabricFiltersorBagHousesBaghousesareusedtocontrolairpollutantsfromcoal-firedpowerplants,steelmills,foundries,andotherindustrialprocesses.Fabricfilerscancollectover99.9%oftheenteringparticulates,evenfinePM.Baghousesalsoaresometimesusedaspartofamultistagegascleaningsystemwheretheyareusedasareactoraswellasaparticulateremovaldevice,suchasinsemi-dryfluegasdesulphurizationsystems.Recentlysomebaghousesarebeingequippedwithcatalyticbagswheretheyalsoactasachemicalreactorwhiletheyarecollectingparticulate.AirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

CatalyticReactorsCatalyticreactors,referredtoasselectivecatalyticreduction(SCR)systems,areuseextensivelytocontrolNOx,emissionsarisingfromtheburningoffossilfuelsinindustrialprocesses.AmmoniaisinjectedandmixedwiththefluegasesupstreamoftheSCRreactor.IntheSCRreactor,ammoniaandNOx,reacttoformnitrogenandwater.Greaterthan90%NOx,removalispossiblewiththesesystems.AirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

CatalyticReactorsCatalyticreactorsalsoperformthermaldestructionfunctionslikeincinerators,butatlowertemperaturesandforselectedwastegasesonly.Theyincorporatebedsofsolidcatalyticmaterialthattheunwantedgasespassthrough,typicallyforoxidationorreductionpurposes.Catalyticreactorshavetheadvantageofloweringthethermalenergyrequirements.Destructionefficienciesof99.99%arepossiblewithsignificantlyreducedenergyandoperatingcostsascomparedtoanincinerator.AirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

CyclonesDust-ladengasiswhirledrapidlyinsideacollectorshapedlikeacylinder(orcyclone).Theswirlingmotioncreatescentrifugalforcesthatcausetheparticlestobethrownagainstthewallsofthecylinderanddropintoahopperbelow.Thegasleftinthemiddleofthecylinderafterthedustparticleshavebeenremovedmovesupwardandexitsthecylinder.CyclonesoperatetocollectrelativelylargesizePMfromagaseousstream,andcanoperateatelevatedtemperatures.AirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

CyclonesCyclonesaretypicallyusedfortheremovalofparticles50microns(μm)orlarger.Efficienciesgreaterthan90%forparticlesizesof10μmorgreaterarepossible,andefficiencyincreasesexponentiallywithparticlediameterandwithincreasedpressuredropthroughthecyclone.Cyclonesarewidelyused;theycontrolpollutantsfromcottongins,rockcrushers,andmanyotherindustrialprocessesthatcontainrelativelylargeparticulateinthegasstream.Heavydustattheinletofthecyclonecanalsoleadtopluggingofthecyclonehopper.AirPollutionEmissionControlDevicesforStationaryAbsorption&WetScrubbingEquipment

ElectrostaticPrecipitators(ESPs)ESPsarerelativelylarge,lowvelocitydustcollectiondevicesthatremoveparticlesinmuchthesamewaythatstaticele