轮机英语教学课件(16)-Marine-Boilers

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

TypesofboilerFiretubeboilersandwatertubeboilersBoilermountingsSafetyvalvesMainsteamstopvalveWaterlevelgaugeWasteheatrecoverysystemMainContentsoftheText

Type轮机英语教学课件(16)-Marine-BoilersMainContentsoftheText

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

ThisUsefulVocabulary&SpecialTerms1.distinct:completelydifferentfrom名词：distinctioneg.Therearetwodistincttypesofmarineboilersinuseonboardship.2.mounting:partofamachine(equaltofitting)boilermountings(fittings)锅炉附件3.analyze:分析名词：analysiseg.analysiscertificate化验证书4.refractory

耐火的，耐热的

refractoryalloy高熔点合金refractorybrick耐火砖

refractorycastingtube耐热铸管refractorycoating耐火涂料，耐热层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轮机英语教学课件(16)-Marine-BoilersCochranspheroidverticalboilerCochranspheroidverticalboilBoilerMountings:Safetyvalves:toprotecttheboileragainstoverpressure.Mainstemstopvalve:usuallyfittedinthemainsteamsupplylineandisusuallyofthenon-returntype.Auxiliarystemstopvalve:asmallervalvefittedintheauxiliarysteamsupplyline,andisusuallyofthenon-returnvalve.BoilerMountings:SafetyvalvesBoilerMountings:Blowdownvalve:Thisvalveenableswatertobeblowndownoremptiedfromtheboiler.Scumvalve:ashallowdishpositionedatthenormalwaterlevelisconnectedtothescumvalve.Thisenablestheblowingdownorremovalofscumandimpuritiesfromthewatersurface.BoilerMountings:Blowdownval轮机英语教学课件(16)-Marine-BoilersDetailedAnalysisofDifficultSentences1Fire-tubeboilersareusedforauxiliarypurposestoprovidesmallerquantitiesoflowpressuresteamondieselenginepoweredships.

火管锅炉应用于辅助的目的，为柴油机动力船提供少量的低压蒸汽。

Powered为过去分词作前置定语DetailedAnalysisofDifficultDetailedAnalysisofDifficultSentencesGenerationofelectricpowerfromasteamturbo-generatorandthesupplyofsaturatedsteam(饱合蒸汽)toheatingservicesbyexhaustgasheatrecoverysystemsiseffectedinmanyships.在许多船上通过废热回收装置由蒸汽涡轮发动机发电和向加热设备供应饱和蒸汽均有应用。该句为主系表结构，is之前皆为主语。DetailedAnalysisofDifficultReviewQuestions1.Whatarethetwotypesofmarineboilersandwhatarethedifferencesbetweenthem?2.Whatisbenttubedesign?3.Whatisdonkeyboileranditsfunction?4.Whatiswaste-heatboiler？ReviewQuestionsLesson16MarineBoilers1.MainContentsoftheText2.UsefulVocabulary&SpecialTerms3.DetailedAnalysisofDifficultSentences4.ReviewQuestions5.SomeRelevantMultipleChoiceExercisesLesson16MarineBoilers1.MainContentsoftheText

TypesofboilerFiretubeboilersandwatertubeboilersBoilermountingsSafetyvalvesMainsteamstopvalveWaterlevelgaugeWasteheatrecoverysystemMainContentsoftheText

Type轮机英语教学课件(16)-Marine-BoilersMainContentsoftheText

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

ThisUsefulVocabulary&SpecialTerms1.distinct:completelydifferentfrom名词：distinctioneg.Therearetwodistincttypesofmarineboilersinuseonboardship.2.mounting:partofamachine(equaltofitting)boilermountings(fittings)锅炉附件3.analyze:分析名词：analysiseg.analysiscertificate化验证书4.refractory

耐火的，耐热的

refractoryalloy高熔点合金refractorybrick耐火砖

refractorycastingtube耐热铸管refractorycoating耐火涂料，耐热层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轮机英语教学课件(16)-Marine-BoilersCochranspheroidverticalboilerCochranspheroidverticalboilBoilerMountings:Safetyvalves:toprotecttheboileragainstoverpressure.Mainstemstopvalve:usuallyfittedinthemainsteamsupplylineandisusuallyofthenon-returntype.Auxiliarystemstopvalve:asmallervalvefittedintheauxiliarysteamsupplyline,andisusuallyofthenon-returnvalve.BoilerMountings:SafetyvalvesBoilerMountings:Blowdownvalve:Thisvalveenableswatertobeblowndownoremptiedfromtheboiler.Scumvalve:ashallowdishpositionedatthenormalwaterlevelisconnectedtothescumvalve.Thisenablestheblowing