.轮机英语（轮机长大管轮）Lesson 20 Troubleshooting of Marine Boiler.ppt

Lesson20TroubleshootingofMarineBoiler

NewWordsandExpressionstroubleshooting[tr?bl,?u:ti?]vi.检修boiler[b??l?]n锅炉combustion[k?mb?st??n]n燃烧furnace[f?n?s]n炉ultimately[?lt?m?tl?]adv.最后，最终competent[kɑmp?t?nt]adj.胜任的，有能力的tripped[tr?pt]v脱扣plugged[pl?ɡd]adj.堵塞

NewWordsandExpressionswired[wa??d]adj.接线的solenoid[sol?,n??d]n螺线管，电磁strainer[stren?]n过滤器overfill[ov?f?l]vt./vi.把…装的溢出；满溢scale[skel]n水垢probe[prob]n探针foaming[f?umi?]n起泡flashback[fl??b?k]n回火

NewWordsandExpressionsdrafty[dr?fti]adj.通风良好的kink[k??k]v扭结purge[p?:d?]v扫风

Oneofthemostimportantitemsofequipmentaboardships,boilersareusedfornumerouspurposes.Whetheritissteampoweredorhasadieselengineasthemainformofpropulsion,ashipwithoutaboilerisreallydifficulttoimagine;aboiler,inoneformoranotherwillbefoundonaship.Forexampleifashipisasteampoweredship,twoormoreboilerswillbeprovidedtoproducehightemperature,highpressuresteam.Ifashipiscarryingadieselengineasthemainpropulsionsystem,oneortwosmallerboilersareusedforrunningvariousshipsmachineryandservices.

Abasicboilerisamachinewiththesimplestarrangementoftheinternalparts.Themainjobofaboileristomakehighpressuresteam.Thefeedwatersuppliedtotheboilerdrumutilizestheheatoftheenergyreleasedbyburningthefuel.Thisenergyoftheburningfuelisstoredintheformofsteamwithhightemperatureandpressure.Thefuelisburntinacombustionchamberinsidetheboiler.Toattainhighefficiencyandcompletecombustion,airissuppliedtothiscombustionchamberthroughaseparatearrangement.Theheatgeneratedinthiscombustionchamberistransferredtothewaterfromtheboilerdrumthroughalargesurfacearea,whichenablesthehighestrateofenergytransfer.

Therearetwomaintypesofboilers.Theseareknownasthebasicboilers,therestallaredifferentversionsofthem.Themaintwobasicboilersare:Awatertubeboilerisatypeof