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1、300MW火电机组运行技术比武理论试题300MWthermalpowerunitoperationtechnologycontesttheorytest(volumeA)First,fillintheblanks(1pointsperminute,20points)1,whenthetotalpowerdeliveredbythegeneratorisgreaterthanthetotalpoweroftheuser,thesystemfrequencyisraised,andthesystemfrequencyislowerthan
2、thetotalpoweroftheuser.2,thepurposeofchangingthestatorwindingofturbogeneratoristoreducetheeddycurrentlossesandadditionallossescausedbyleakage・3,whensingle-phasebreakoccurs,themosteffectivewayistoreducetheloadofthefailureunit・4,thefuelburnerignitiondistaneeistoonearburne
3、rburnorcauseburnerportcoking,toofarfromtheignitiondelayordifficultignition.5,drumwaterlevelcompensation(correction)approachistousedrumpressurefordensitycompensation,steamf1owcompensationmethodistheuseoftemperaturesignalcompensation.6,whenenteringtheelectricfieldwork,the
4、coronapolemustreliablygrounding,incasethesuddentransmission.7,thepressurerunningdeaeratorwillproduceboilingphenomenonwhentheunitisunderload,whichwillcauseharmtothepumpequipmentinoperation・&Whenburningandoxidationofsulfurinthefuelintheairaspartofsulfurdioxide,andthenoxid
5、izedtothreesulfurdioxide,itlowersthetemperatureofthecombustiongas,steamandgascombinedatthesametime,theformationofsulfuricacidvaporcondensationatlowtemperature,theboilerairpreheaterandfluebycorrosion.9,thetwoburningofthetailoftheboileriscausedbyincompletecombustionoffuel
6、,whichisgatheredinthetailflue.Thepreventivemeasuresaretosweepbeforestartingandtoorganizethecombustionreasonably.10.Thegeneratorcoolingmediumusuallyhasair,hydrogenandwater・Two,judgmentquestions(2pointsperminute,20points)1,inrushcurrentisnotdangeroustotransformer,becauset
7、hisimpulsecurrentexistsforashorttime・(V)2,isstrictlyprohibitedintheprocessofturningthegasexchangetostartandstopthe・(V)3、notimecurrentfastbreakprotectionisafasttrackprotection.(x)Oilseal4,generatoristhemainfunctionofthecoolingseal(x)5,Thecommoncauseofthevibrationofthedra
8、ftfanistheimbalancecausedbyashaccumulationorwear・(V)6,becauseofincompletecombustionofcoal,theashmeltingpointof