POWERPLANTisthethemostimportantsectorinanydevelopedordevelopingcountry.SoitisveryimportantspeciallyforMechanicalandElectricalengineerstoknowaboutthelayoutandworkingofpowerplant.

POWERPLANT

THURSDAY,27DECEMBER2012

TURBINEOILINGSYSTEM

A single oil supply line lubricates and cools the bearing, governs them/c andoperatesthehydraulicactuatorsandsafetyandprotectivedevices.During startup & shutdown, aux oil pump supplies the control oil. Once theturbinespeed ismore than2850rpm, themainoilpump(M.O.P) takesover. Itdrawsoilfrommaintank.Thelubricatingoilpassesthroughoilcooler,beforecanbesuppliedtothebearing(Underemergency,lubeoilcanbesuppliedbyaDCoil pump).Before the turbine is turned or barred, Jacking oil pump (2 nos.)supplies high pressure oil to the jack up the TG shaft to prevent boundarylubricationandalsosupplieshighpressureoiltodrivethehydraulicmotor(turninggear)

Function:

1.Providesasupplyofoiltojournalbearingstogiveanoilwedgeastheshaftrotates.2.Maintainsthetemperatureofturbinebearingsconstantattherequiredlevel. 3.Providesamedium forhydraulicallyoperating thegovernorgearandcontrollingthesteamadmissionvalves.4.Providesforhydrogencooledgeneratorsasealingmediumtopreventhydrogenleakingoutalongtheshaft.

1. OILSUPPLY

2)Turbinelubricatingoilsystem

3)Maincomponents

RaneAmitVasudeoStudentMechanicalEngineeringgreatinterestinmechanicalrelatedstuff,presentatedvariousprojectpapersatNationalandInternationalconference,alsowonvariousprizesatNationallevelpaperpresentation.

ABOUTME

2012(6)December

(6)TURBINE

OILINGSYSTEM

CONSTRUCTIONOFBEARINGNO.1

TurbineBearingArrangement

MULTISTAGETURBINES

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PostedbyAmitRaneat19:26 2comments:

1)MainOilPump2)AuxiliaryOilPump3)EmergencyOilPump4)JackingOilPump5)MainOilTank(MOT)6)Centrifugal

3.1)MainOilPumpThispumpislocatedatthefrontbearingpedestaloftheHPturbine.Itiscoupledtotheturbinerotorthroughagearcoupling.Whentheturbineisrunningatanormalspeedof3000rpm,thenthedesiredquantityofoiltothegoverningsystemsandthelubricationsystemsissuppliedbythispump.

3.2)AuxiliaryOilPump

AuxiliaryOilPumpcanmeettherequirementsoflubricationsystemunderemergencyconditions

OnestageverticalcentrifugalpumpdrivenbyanA.C.electricmotor.Ithasradialimpellerandvolutecasing.Thepumpautomaticallytakesoverunderinterlockactionwhenevertheoilpressureinthelubricationsystemfailsbelowcertaindesiredlevel.

3.3)EmergencyOilPumpEmergencyoilpumphasbeenforeseenbyasabackupprotectiontoACdrivenstandbyoilpump.Thisisacentrifugalpump,drivenbyDCelectricmotor.ThisautomaticallycutsinwheneverthereisafailureofACsupplyatpowerstation

3.4)JackingOilPump:

JOPensuresthatthereisnometalcontactbetweenajournalandthebearing.Positivedisplacementpumpsthatprovidehighpressuresupplyofoilunderstrategicjournalsoftheturbogeneratorandoilliftstheshaftslightly.Thisgreatlyreducesthestaticfrictionandbearingwear.TheJOPcanbestoppedafterthelubricatingoilfilmisestablishedbetweentheshaftandbearings.Pressureproducedis120bars

3.5)MainoiltankTheoilusedforlubricationisstoredintheMaiOilTank.Capacity20/32m3.TheMainOilTankholdstheoilinsidethetankforaperiodlongenoughtoensureliberationofairfromtheoil.Filtersarelocatedinsidethetanktofiltertheoilduringitsnormalcourse.Theoiltankissupportedonaframedstructurejustbelowtheturbineflooratthelefthandsideoftheturbine.

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CONSTRUCTIONOFMULTISTAGETURBINE

250MWKWUGOVERNINGSYSTEM

WEDNESDAY,26DECEMBER2012

PostedbyAmitRaneat18:31 Nocomments:

CONSTRUCTIONOFBEARINGNO.1

TheTGunit ismountedon1bearing.HPTrotor ismountedon twobearings,adouble wedged journal bearing at the front and combined/journal bearingadjacent to front IP rotor coupling. The IP & LP rotors have a journal bearingeach at the end of the shaft. The journal bearing of IP & LP rotors are selfadjusting tragspiegal bearings. The bearing pedestals are anchored to thefoundation and are fixed in position. The HP & IP cylinder rest through theirsupportpalmsonbearingpedestals.TheaxialpositionofHPcylinderisfixedatthecasingguideonthefrontendofHPIPpedestal.TheexpansionofIPcylindertakes from hpip pedestal towards generator. The fixed point for the LP outercasingisatthecenterofthelongitudinalgirder.

1)BEARING

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TurbineBearingArrangement

Thefixedpointsoftheturbineareasfollows:a)Allthebearingpedestalb)MiddleofthelongitudinalgirderofLpturbine

1)FIXEDPIONTS(TURBINEEXPANSION)

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PostedbyAmitRaneat01:33 Nocomments:

c)ThethrustbearinginHPIPpedestal.

TheHP& IP turbines both restwith its lateral on the bearing pedestals at theturbinecenterlinelevel.TheexpansionofHPfrontpedestalandthatofIPturbinefromHPIPpedestaltowardsIPLPpedestalbycasingguides.ThecasingoftheLpturbineislocatedaxiallyinthecenterareaofthelongitudinalbeambyfittedkeyscastinthefoundation.Freelateralexpansionisallowed.Thecenterguidesforthiscasingarerecessedinthefoundationcrossbeams.Thereisnorestrictionontheaxialmovementofthecasing.Whenthereisatempdifferencerise,theoutercasingofLPturbineexpandsfromitsfixedpoint.Differenceinexpansionbetntheoutercasingandthefixedbearingpedestalsaretakenupbythebellowexpansionjoints.

ThrustbearingisincorporatedinHPIPpedestals.SeenfromthispointboththerotorandcasingofturbineexpandstowardsthefrontbearinghousingofHPturbine.TherotorandcasingofIPandlpturbinesexpandstowardsthegenerator

Differential expansion between rotor and casing results from the differencebetweenthecasingexpansionandrotorexpansion.Maximumdiff.expansionofHPIPturbineoccursatthefarthestfromthethrustbearing.Differential expansion between the rotor and casing of LP results from thedifferencebetntheexpansionoftheshaftassembly(IP+LProtor)originatingfromthethrustbearingandthecasingexpansionwhichoriginatesfromthefixedpointontheLPturbinelongitudinalbeam.

2)CASINGEXPANSION

3)ROTOREXPANSION

4)DIFFERENTIALEXPANSION

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