輪機英語教學課件(16)-Marine-Boilers

Lesson16MarineBoilers1.MainContentsoftheText2.UsefulVocabulary&SpecialTerms3.DetailedAnalysisofDifficultSentences4.ReviewQuestions5.SomeRelevantMultipleChoiceExercisesLesson16MarineBoilers1.MainContentsoftheText

TypesofboilerFiretubeboilersandwatertubeboilersBoilermountingsSafetyvalvesMainsteamstopvalveWaterlevelgaugeWasteheatrecoverysystemMainContentsoftheText

Type輪機英語教學課件(16)-Marine-BoilersMainContentsoftheText

Thisunittellsustherearetwodistincttypesofmarineboilers,i.e.fire-tubeboilerandwater-tubeboiler.Inthisunit,wealsocanlearndifferentfunctionsoftwodistincttypeofmarineboilersandtheiradvantagesanddisadvantages.Wealsohavetopayattentiontothebasicstructuresofmarineboilersandfunctionsofmountingsofaboiler.MainContentsoftheText

ThisUsefulVocabulary&SpecialTerms1.distinct:completelydifferentfrom名詞：distinctioneg.Therearetwodistincttypesofmarineboilersinuseonboardship.2.mounting:partofamachine(equaltofitting)boilermountings(fittings)鍋爐附件3.analyze:分析名詞：analysiseg.analysiscertificate化驗證書4.refractory

耐火的，耐熱的

refractoryalloy高熔點合金refractorybrick耐火磚

refractorycastingtube耐熱鑄管refractorycoating耐火涂料，耐熱層UsefulVocabulary&SpecialTeUsefulVocabulary&SpecialTerms

:DefinitionofboilersFire-tubeboiler:

thehotgasesfromthefurnacepassthroughthetubeswhilethewaterisontheoutside.

Water-tubeboiler:thewaterthroughinsideofthetubeswhilethehotfurnacegasespassaroundtheoutside.

UsefulVocabulary&SpecialTeComparisonbetweentwotypesofboilersFunctions:Fire-tubeboilerarecommonlyusedwithsteamreciprocatingenginesonboardship,butbecauseoftheir

comparativelypoorefficiencyandlowpower/weight

ratio,

thesesystemarenolongerinstalledforpropulsionplant.

water-tubeboilerareusedwidelyontheship.However,thewater-tubeboilerrequiregreatskillinoperatingandmaintaining.esp.withregardtothepurityofthefeedwater,itsupkeepismoreexpensivethanthefire-tubeboiler.

ComparisonbetweentwotypesoComparisonbetweentwotypesofboilersWater-tubeboilerhasdistinctadvantageoverfire-tubeboiler:1.Thesteamcanberaisedfromcoldwaterinshortperiodoftimebecausecirculationofthewaterisnaturalandimmediateonlightingup.2.Thesteamandwaterdrumsaresmallindiametercomparedwiththelargeshellofthefiretubeboilers,thereforetheyaresuitableformuchhighersteampressure.3.Lessmassofwateriscarriedinboiler,henceasavinginweightandlessspaceistakenupforthesameoutput.Comparisonbetweentwotypeso輪機英語教學課件(16)-Marine-BoilersCochranspheroidverticalboilerCochranspheroidverticalboilBoilerMountings:Safetyvalves:toprotecttheboileragainstoverpressure.Mainstemstopvalve:usuallyfittedinthemainsteamsupplylineandisusuallyofthenon-returntype.Auxiliarystemstopvalve:asmallervalvefittedintheauxiliarysteamsupplyline,andisusuallyofthenon-returnvalve.BoilerMountings:SafetyvalvesBoilerMountings:Blowdownvalve:Thisvalveenableswatertobeblowndownoremptiedfromtheboiler.Scumvalve:ashallowdishpositionedatthenormalwaterlevelisconnectedtothescumvalve.Thisenablestheblowingdownorremovalofscumandimpuritiesfromthewatersurface.BoilerMountings:Blowdownval輪機英語教學課件(16)-Marine-BoilersDetailedAnalysisofDifficultSentences1Fire-tubeboilersareusedforauxiliarypurposestoprovidesmallerquantitiesoflowpressuresteamondieselenginepoweredships.

火管鍋爐應用于輔助的目的，為柴油機動力船提供少量的低壓蒸汽。

Powered為過去分詞作前置定語DetailedAnalysisofDifficultDetailedAnalysisofDifficultSentencesGenerationofelectricpowerfromasteamturbo-generatorandthesupplyofsaturatedsteam(飽合蒸汽)toheatingservicesbyexhaustgasheatrecoverysystemsiseffectedinmanyships.在許多船上通過廢熱回收裝置由蒸汽渦輪發(fā)動機發(fā)電和向加熱設備供應飽和蒸汽均有應用。該句為主系表結構，is之前皆為主語。DetailedAnalysisofDifficultReviewQuestions1.Whatarethetwotypesofmarineboilersandwhatarethedifferencesbetweenthem?2.Whatisbenttubedesign?3.Whatisdonkeyboileranditsfunction?4.Whatiswaste-heatboiler？ReviewQuestionsLesson16MarineBoilers1.MainContentsoftheText2.UsefulVocabulary&SpecialTerms3.DetailedAnalysisofDifficultSentences4.ReviewQuestions5.SomeRelevantMultipleChoiceExercisesLesson16MarineBoilers1.MainContentsoftheText

TypesofboilerFiretubeboilersandwatertubeboilersBoilermountingsSafetyvalvesMainsteamstopvalveWaterlevelgaugeWasteheatrecoverysystemMainContentsoftheText

Type輪機英語教學課件(16)-Marine-BoilersMainContentsoftheText

Thisunittellsustherearetwodistincttypesofmarineboilers,i.e.fire-tubeboilerandwater-tubeboiler.Inthisunit,wealsocanlearndifferentfunctionsoftwodistincttypeofmarineboilersandtheiradvantagesanddisadvantages.Wealsohavetopayattentiontothebasicstructuresofmarineboilersandfunctionsofmountingsofaboiler.MainContentsoftheText

ThisUsefulVocabulary&SpecialTerms1.distinct:completelydifferentfrom名詞：distinctioneg.Therearetwodistincttypesofmarineboilersinuseonboardship.2.mounting:partofamachine(equaltofitting)boilermountings(fittings)鍋爐附件3.analyze:分析名詞：analysiseg.analysiscertificate化驗證書4.refractory

耐火的，耐熱的

refractoryalloy高熔點合金refractorybrick耐火磚

refractorycastingtube耐熱鑄管refractorycoating耐火涂料，耐熱層UsefulVocabulary&SpecialTeUsefulVocabulary&SpecialTerms

:DefinitionofboilersFire-tubeboiler:

thehotgasesfromthefurnacepassthroughthetubeswhilethewaterisontheoutside.

Water-tubeboiler:thewaterthroughinsideofthetubeswhilethehotfurnacegasespassaroundtheoutside.

UsefulVocabulary&SpecialTeComparisonbetweentwotypesofboilersFunctions:Fire-tubeboilerarecommonlyusedwithsteamreciprocatingenginesonboardship,butbecauseoftheir

comparativelypoorefficiencyandlowpower/weight

ratio,

thesesystemarenolongerinstalledforpropulsionplant.

water-tubeboilerareusedwidelyontheship.However,thewater-tubeboilerrequiregreatskillinoperatingandmaintaining.esp.withregardtothepurityofthefeedwater,itsupkeepismoreexpensivethanthefire-tubeboiler.

ComparisonbetweentwotypesoComparisonbetweentwotypesofboilersWater-tubeboilerhasdistinctadvantageoverfire-tubeboiler:1.Thesteamcanberaisedfromcoldwaterinshortperiodoftimebecausecirculationofthewaterisnaturalandimmediateonlightingup.2.Thesteamandwaterdrumsaresmallindiametercomparedwiththelargeshellofthefiretubeboilers,thereforetheyaresuitableformuchhighersteampressure.3.Lessmassofwateriscarriedinboiler,henceasavinginweightandlessspaceistakenupforthesameoutput.Comparisonbetweentwotypeso輪機英語教學課件(16)-Marine-BoilersCochranspheroidverticalboilerCochranspheroidverticalboilBoilerMountings:Safetyvalves:toprotecttheboileragainstoverpressure.Mainstemstopvalve:usuallyfittedinthemainsteamsupplylineandisusuallyofthenon-returntype.Auxiliarystemstopvalve:asmallervalvefittedintheauxiliarysteamsupplyline,andisusuallyofthenon-returnvalve.BoilerMountings:SafetyvalvesBoilerMountings:Blowdownvalve:Thisvalveenableswatertobeblowndownoremptiedfromtheboiler.Scumvalve:ashallowdishpositionedatthenormalwaterlevelisconnectedtothescumvalve.Thisenablestheblowing